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![Joe Perches](/assets/img/avatar_default.png)
Some of the logging can be poorly formatted because of unexpected line breaks given printks without KERN_CONT that should be pr_cont. Miscellanea: o Remove unnecessary spaces between function name and open parenthesis o Convert bare printks to pr_<level> where appropriate o Convert embedded function names to use %s, __func__ o Coalesce formats o Realign arguments o Use do {} while (0) in a macro and not a bare if Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Link: https://lore.kernel.org/r/20200403134325.11523-3-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2238 lines
66 KiB
C
2238 lines
66 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Low-level parallel port routines for built-in port on SGI IP32
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*
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* Author: Arnaud Giersch <arnaud.giersch@free.fr>
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*
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* Based on parport_pc.c by
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* Phil Blundell, Tim Waugh, Jose Renau, David Campbell,
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* Andrea Arcangeli, et al.
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*
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* Thanks to Ilya A. Volynets-Evenbakh for his help.
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*
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* Copyright (C) 2005, 2006 Arnaud Giersch.
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*/
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/* Current status:
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*
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* Basic SPP and PS2 modes are supported.
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* Support for parallel port IRQ is present.
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* Hardware SPP (a.k.a. compatibility), EPP, and ECP modes are
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* supported.
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* SPP/ECP FIFO can be driven in PIO or DMA mode. PIO mode can work with
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* or without interrupt support.
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*
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* Hardware ECP mode is not fully implemented (ecp_read_data and
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* ecp_write_addr are actually missing).
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*
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* To do:
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*
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* Fully implement ECP mode.
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* EPP and ECP mode need to be tested. I currently do not own any
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* peripheral supporting these extended mode, and cannot test them.
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* If DMA mode works well, decide if support for PIO FIFO modes should be
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* dropped.
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* Use the io{read,write} family functions when they become available in
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* the linux-mips.org tree. Note: the MIPS specific functions readsb()
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* and writesb() are to be translated by ioread8_rep() and iowrite8_rep()
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* respectively.
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*/
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/* The built-in parallel port on the SGI 02 workstation (a.k.a. IP32) is an
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* IEEE 1284 parallel port driven by a Texas Instrument TL16PIR552PH chip[1].
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* This chip supports SPP, bidirectional, EPP and ECP modes. It has a 16 byte
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* FIFO buffer and supports DMA transfers.
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*
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* [1] http://focus.ti.com/docs/prod/folders/print/tl16pir552.html
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*
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* Theoretically, we could simply use the parport_pc module. It is however
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* not so simple. The parport_pc code assumes that the parallel port
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* registers are port-mapped. On the O2, they are memory-mapped.
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* Furthermore, each register is replicated on 256 consecutive addresses (as
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* it is for the built-in serial ports on the same chip).
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*/
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/*--- Some configuration defines ---------------------------------------*/
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/* DEBUG_PARPORT_IP32
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* 0 disable debug
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* 1 standard level: pr_debug1 is enabled
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* 2 parport_ip32_dump_state is enabled
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* >=3 verbose level: pr_debug is enabled
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*/
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#if !defined(DEBUG_PARPORT_IP32)
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# define DEBUG_PARPORT_IP32 0 /* 0 (disabled) for production */
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#endif
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/*----------------------------------------------------------------------*/
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/* Setup DEBUG macros. This is done before any includes, just in case we
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* activate pr_debug() with DEBUG_PARPORT_IP32 >= 3.
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*/
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#if DEBUG_PARPORT_IP32 == 1
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# warning DEBUG_PARPORT_IP32 == 1
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#elif DEBUG_PARPORT_IP32 == 2
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# warning DEBUG_PARPORT_IP32 == 2
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#elif DEBUG_PARPORT_IP32 >= 3
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# warning DEBUG_PARPORT_IP32 >= 3
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# if !defined(DEBUG)
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# define DEBUG /* enable pr_debug() in kernel.h */
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# endif
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#endif
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/parport.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <asm/ip32/ip32_ints.h>
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#include <asm/ip32/mace.h>
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/*--- Global variables -------------------------------------------------*/
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/* Verbose probing on by default for debugging. */
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#if DEBUG_PARPORT_IP32 >= 1
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# define DEFAULT_VERBOSE_PROBING 1
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#else
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# define DEFAULT_VERBOSE_PROBING 0
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#endif
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/* Default prefix for printk */
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#define PPIP32 "parport_ip32: "
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/*
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* These are the module parameters:
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* @features: bit mask of features to enable/disable
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* (all enabled by default)
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* @verbose_probing: log chit-chat during initialization
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*/
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#define PARPORT_IP32_ENABLE_IRQ (1U << 0)
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#define PARPORT_IP32_ENABLE_DMA (1U << 1)
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#define PARPORT_IP32_ENABLE_SPP (1U << 2)
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#define PARPORT_IP32_ENABLE_EPP (1U << 3)
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#define PARPORT_IP32_ENABLE_ECP (1U << 4)
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static unsigned int features = ~0U;
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static bool verbose_probing = DEFAULT_VERBOSE_PROBING;
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/* We do not support more than one port. */
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static struct parport *this_port;
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/* Timing constants for FIFO modes. */
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#define FIFO_NFAULT_TIMEOUT 100 /* milliseconds */
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#define FIFO_POLLING_INTERVAL 50 /* microseconds */
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/*--- I/O register definitions -----------------------------------------*/
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/**
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* struct parport_ip32_regs - virtual addresses of parallel port registers
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* @data: Data Register
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* @dsr: Device Status Register
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* @dcr: Device Control Register
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* @eppAddr: EPP Address Register
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* @eppData0: EPP Data Register 0
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* @eppData1: EPP Data Register 1
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* @eppData2: EPP Data Register 2
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* @eppData3: EPP Data Register 3
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* @ecpAFifo: ECP Address FIFO
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* @fifo: General FIFO register. The same address is used for:
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* - cFifo, the Parallel Port DATA FIFO
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* - ecpDFifo, the ECP Data FIFO
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* - tFifo, the ECP Test FIFO
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* @cnfgA: Configuration Register A
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* @cnfgB: Configuration Register B
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* @ecr: Extended Control Register
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*/
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struct parport_ip32_regs {
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void __iomem *data;
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void __iomem *dsr;
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void __iomem *dcr;
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void __iomem *eppAddr;
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void __iomem *eppData0;
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void __iomem *eppData1;
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void __iomem *eppData2;
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void __iomem *eppData3;
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void __iomem *ecpAFifo;
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void __iomem *fifo;
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void __iomem *cnfgA;
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void __iomem *cnfgB;
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void __iomem *ecr;
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};
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/* Device Status Register */
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#define DSR_nBUSY (1U << 7) /* PARPORT_STATUS_BUSY */
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#define DSR_nACK (1U << 6) /* PARPORT_STATUS_ACK */
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#define DSR_PERROR (1U << 5) /* PARPORT_STATUS_PAPEROUT */
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#define DSR_SELECT (1U << 4) /* PARPORT_STATUS_SELECT */
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#define DSR_nFAULT (1U << 3) /* PARPORT_STATUS_ERROR */
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#define DSR_nPRINT (1U << 2) /* specific to TL16PIR552 */
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/* #define DSR_reserved (1U << 1) */
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#define DSR_TIMEOUT (1U << 0) /* EPP timeout */
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/* Device Control Register */
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/* #define DCR_reserved (1U << 7) | (1U << 6) */
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#define DCR_DIR (1U << 5) /* direction */
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#define DCR_IRQ (1U << 4) /* interrupt on nAck */
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#define DCR_SELECT (1U << 3) /* PARPORT_CONTROL_SELECT */
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#define DCR_nINIT (1U << 2) /* PARPORT_CONTROL_INIT */
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#define DCR_AUTOFD (1U << 1) /* PARPORT_CONTROL_AUTOFD */
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#define DCR_STROBE (1U << 0) /* PARPORT_CONTROL_STROBE */
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/* ECP Configuration Register A */
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#define CNFGA_IRQ (1U << 7)
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#define CNFGA_ID_MASK ((1U << 6) | (1U << 5) | (1U << 4))
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#define CNFGA_ID_SHIFT 4
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#define CNFGA_ID_16 (00U << CNFGA_ID_SHIFT)
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#define CNFGA_ID_8 (01U << CNFGA_ID_SHIFT)
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#define CNFGA_ID_32 (02U << CNFGA_ID_SHIFT)
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/* #define CNFGA_reserved (1U << 3) */
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#define CNFGA_nBYTEINTRANS (1U << 2)
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#define CNFGA_PWORDLEFT ((1U << 1) | (1U << 0))
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/* ECP Configuration Register B */
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#define CNFGB_COMPRESS (1U << 7)
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#define CNFGB_INTRVAL (1U << 6)
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#define CNFGB_IRQ_MASK ((1U << 5) | (1U << 4) | (1U << 3))
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#define CNFGB_IRQ_SHIFT 3
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#define CNFGB_DMA_MASK ((1U << 2) | (1U << 1) | (1U << 0))
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#define CNFGB_DMA_SHIFT 0
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/* Extended Control Register */
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#define ECR_MODE_MASK ((1U << 7) | (1U << 6) | (1U << 5))
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#define ECR_MODE_SHIFT 5
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#define ECR_MODE_SPP (00U << ECR_MODE_SHIFT)
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#define ECR_MODE_PS2 (01U << ECR_MODE_SHIFT)
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#define ECR_MODE_PPF (02U << ECR_MODE_SHIFT)
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#define ECR_MODE_ECP (03U << ECR_MODE_SHIFT)
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#define ECR_MODE_EPP (04U << ECR_MODE_SHIFT)
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/* #define ECR_MODE_reserved (05U << ECR_MODE_SHIFT) */
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#define ECR_MODE_TST (06U << ECR_MODE_SHIFT)
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#define ECR_MODE_CFG (07U << ECR_MODE_SHIFT)
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#define ECR_nERRINTR (1U << 4)
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#define ECR_DMAEN (1U << 3)
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#define ECR_SERVINTR (1U << 2)
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#define ECR_F_FULL (1U << 1)
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#define ECR_F_EMPTY (1U << 0)
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/*--- Private data -----------------------------------------------------*/
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/**
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* enum parport_ip32_irq_mode - operation mode of interrupt handler
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* @PARPORT_IP32_IRQ_FWD: forward interrupt to the upper parport layer
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* @PARPORT_IP32_IRQ_HERE: interrupt is handled locally
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*/
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enum parport_ip32_irq_mode { PARPORT_IP32_IRQ_FWD, PARPORT_IP32_IRQ_HERE };
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/**
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* struct parport_ip32_private - private stuff for &struct parport
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* @regs: register addresses
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* @dcr_cache: cached contents of DCR
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* @dcr_writable: bit mask of writable DCR bits
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* @pword: number of bytes per PWord
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* @fifo_depth: number of PWords that FIFO will hold
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* @readIntrThreshold: minimum number of PWords we can read
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* if we get an interrupt
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* @writeIntrThreshold: minimum number of PWords we can write
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* if we get an interrupt
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* @irq_mode: operation mode of interrupt handler for this port
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* @irq_complete: mutex used to wait for an interrupt to occur
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*/
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struct parport_ip32_private {
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struct parport_ip32_regs regs;
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unsigned int dcr_cache;
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unsigned int dcr_writable;
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unsigned int pword;
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unsigned int fifo_depth;
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unsigned int readIntrThreshold;
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unsigned int writeIntrThreshold;
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enum parport_ip32_irq_mode irq_mode;
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struct completion irq_complete;
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};
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/*--- Debug code -------------------------------------------------------*/
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/*
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* pr_debug1 - print debug messages
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*
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* This is like pr_debug(), but is defined for %DEBUG_PARPORT_IP32 >= 1
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*/
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#if DEBUG_PARPORT_IP32 >= 1
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# define pr_debug1(...) printk(KERN_DEBUG __VA_ARGS__)
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#else /* DEBUG_PARPORT_IP32 < 1 */
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# define pr_debug1(...) do { } while (0)
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#endif
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/*
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* pr_trace, pr_trace1 - trace function calls
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* @p: pointer to &struct parport
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* @fmt: printk format string
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* @...: parameters for format string
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*
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* Macros used to trace function calls. The given string is formatted after
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* function name. pr_trace() uses pr_debug(), and pr_trace1() uses
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* pr_debug1(). __pr_trace() is the low-level macro and is not to be used
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* directly.
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*/
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#define __pr_trace(pr, p, fmt, ...) \
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pr("%s: %s" fmt "\n", \
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({ const struct parport *__p = (p); \
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__p ? __p->name : "parport_ip32"; }), \
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__func__ , ##__VA_ARGS__)
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#define pr_trace(p, fmt, ...) __pr_trace(pr_debug, p, fmt , ##__VA_ARGS__)
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#define pr_trace1(p, fmt, ...) __pr_trace(pr_debug1, p, fmt , ##__VA_ARGS__)
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/*
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* __pr_probe, pr_probe - print message if @verbose_probing is true
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* @p: pointer to &struct parport
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* @fmt: printk format string
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* @...: parameters for format string
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*
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* For new lines, use pr_probe(). Use __pr_probe() for continued lines.
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*/
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#define __pr_probe(...) \
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do { if (verbose_probing) printk(__VA_ARGS__); } while (0)
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#define pr_probe(p, fmt, ...) \
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__pr_probe(KERN_INFO PPIP32 "0x%lx: " fmt, (p)->base , ##__VA_ARGS__)
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/*
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* parport_ip32_dump_state - print register status of parport
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* @p: pointer to &struct parport
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* @str: string to add in message
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* @show_ecp_config: shall we dump ECP configuration registers too?
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*
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* This function is only here for debugging purpose, and should be used with
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* care. Reading the parallel port registers may have undesired side effects.
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* Especially if @show_ecp_config is true, the parallel port is resetted.
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* This function is only defined if %DEBUG_PARPORT_IP32 >= 2.
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*/
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#if DEBUG_PARPORT_IP32 >= 2
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static void parport_ip32_dump_state(struct parport *p, char *str,
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unsigned int show_ecp_config)
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{
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struct parport_ip32_private * const priv = p->physport->private_data;
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unsigned int i;
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printk(KERN_DEBUG PPIP32 "%s: state (%s):\n", p->name, str);
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{
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static const char ecr_modes[8][4] = {"SPP", "PS2", "PPF",
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"ECP", "EPP", "???",
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"TST", "CFG"};
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unsigned int ecr = readb(priv->regs.ecr);
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printk(KERN_DEBUG PPIP32 " ecr=0x%02x", ecr);
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pr_cont(" %s",
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ecr_modes[(ecr & ECR_MODE_MASK) >> ECR_MODE_SHIFT]);
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if (ecr & ECR_nERRINTR)
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pr_cont(",nErrIntrEn");
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if (ecr & ECR_DMAEN)
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pr_cont(",dmaEn");
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if (ecr & ECR_SERVINTR)
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pr_cont(",serviceIntr");
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if (ecr & ECR_F_FULL)
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pr_cont(",f_full");
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if (ecr & ECR_F_EMPTY)
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pr_cont(",f_empty");
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pr_cont("\n");
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}
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if (show_ecp_config) {
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unsigned int oecr, cnfgA, cnfgB;
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oecr = readb(priv->regs.ecr);
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writeb(ECR_MODE_PS2, priv->regs.ecr);
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writeb(ECR_MODE_CFG, priv->regs.ecr);
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cnfgA = readb(priv->regs.cnfgA);
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cnfgB = readb(priv->regs.cnfgB);
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writeb(ECR_MODE_PS2, priv->regs.ecr);
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writeb(oecr, priv->regs.ecr);
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printk(KERN_DEBUG PPIP32 " cnfgA=0x%02x", cnfgA);
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pr_cont(" ISA-%s", (cnfgA & CNFGA_IRQ) ? "Level" : "Pulses");
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switch (cnfgA & CNFGA_ID_MASK) {
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case CNFGA_ID_8:
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pr_cont(",8 bits");
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break;
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case CNFGA_ID_16:
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pr_cont(",16 bits");
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break;
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case CNFGA_ID_32:
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pr_cont(",32 bits");
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break;
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default:
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pr_cont(",unknown ID");
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break;
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}
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if (!(cnfgA & CNFGA_nBYTEINTRANS))
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pr_cont(",ByteInTrans");
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if ((cnfgA & CNFGA_ID_MASK) != CNFGA_ID_8)
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pr_cont(",%d byte%s left",
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cnfgA & CNFGA_PWORDLEFT,
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((cnfgA & CNFGA_PWORDLEFT) > 1) ? "s" : "");
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pr_cont("\n");
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printk(KERN_DEBUG PPIP32 " cnfgB=0x%02x", cnfgB);
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pr_cont(" irq=%u,dma=%u",
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(cnfgB & CNFGB_IRQ_MASK) >> CNFGB_IRQ_SHIFT,
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(cnfgB & CNFGB_DMA_MASK) >> CNFGB_DMA_SHIFT);
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pr_cont(",intrValue=%d", !!(cnfgB & CNFGB_INTRVAL));
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if (cnfgB & CNFGB_COMPRESS)
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pr_cont(",compress");
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pr_cont("\n");
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}
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for (i = 0; i < 2; i++) {
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unsigned int dcr = i ? priv->dcr_cache : readb(priv->regs.dcr);
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printk(KERN_DEBUG PPIP32 " dcr(%s)=0x%02x",
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i ? "soft" : "hard", dcr);
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pr_cont(" %s", (dcr & DCR_DIR) ? "rev" : "fwd");
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if (dcr & DCR_IRQ)
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pr_cont(",ackIntEn");
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if (!(dcr & DCR_SELECT))
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pr_cont(",nSelectIn");
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if (dcr & DCR_nINIT)
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pr_cont(",nInit");
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if (!(dcr & DCR_AUTOFD))
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pr_cont(",nAutoFD");
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if (!(dcr & DCR_STROBE))
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pr_cont(",nStrobe");
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pr_cont("\n");
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}
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#define sep (f++ ? ',' : ' ')
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{
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unsigned int f = 0;
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unsigned int dsr = readb(priv->regs.dsr);
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printk(KERN_DEBUG PPIP32 " dsr=0x%02x", dsr);
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if (!(dsr & DSR_nBUSY))
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pr_cont("%cBusy", sep);
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if (dsr & DSR_nACK)
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pr_cont("%cnAck", sep);
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if (dsr & DSR_PERROR)
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pr_cont("%cPError", sep);
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if (dsr & DSR_SELECT)
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pr_cont("%cSelect", sep);
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if (dsr & DSR_nFAULT)
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pr_cont("%cnFault", sep);
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if (!(dsr & DSR_nPRINT))
|
|
pr_cont("%c(Print)", sep);
|
|
if (dsr & DSR_TIMEOUT)
|
|
pr_cont("%cTimeout", sep);
|
|
pr_cont("\n");
|
|
}
|
|
#undef sep
|
|
}
|
|
#else /* DEBUG_PARPORT_IP32 < 2 */
|
|
#define parport_ip32_dump_state(...) do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* CHECK_EXTRA_BITS - track and log extra bits
|
|
* @p: pointer to &struct parport
|
|
* @b: byte to inspect
|
|
* @m: bit mask of authorized bits
|
|
*
|
|
* This is used to track and log extra bits that should not be there in
|
|
* parport_ip32_write_control() and parport_ip32_frob_control(). It is only
|
|
* defined if %DEBUG_PARPORT_IP32 >= 1.
|
|
*/
|
|
#if DEBUG_PARPORT_IP32 >= 1
|
|
#define CHECK_EXTRA_BITS(p, b, m) \
|
|
do { \
|
|
unsigned int __b = (b), __m = (m); \
|
|
if (__b & ~__m) \
|
|
pr_debug1(PPIP32 "%s: extra bits in %s(%s): " \
|
|
"0x%02x/0x%02x\n", \
|
|
(p)->name, __func__, #b, __b, __m); \
|
|
} while (0)
|
|
#else /* DEBUG_PARPORT_IP32 < 1 */
|
|
#define CHECK_EXTRA_BITS(...) do { } while (0)
|
|
#endif
|
|
|
|
/*--- IP32 parallel port DMA operations --------------------------------*/
|
|
|
|
/**
|
|
* struct parport_ip32_dma_data - private data needed for DMA operation
|
|
* @dir: DMA direction (from or to device)
|
|
* @buf: buffer physical address
|
|
* @len: buffer length
|
|
* @next: address of next bytes to DMA transfer
|
|
* @left: number of bytes remaining
|
|
* @ctx: next context to write (0: context_a; 1: context_b)
|
|
* @irq_on: are the DMA IRQs currently enabled?
|
|
* @lock: spinlock to protect access to the structure
|
|
*/
|
|
struct parport_ip32_dma_data {
|
|
enum dma_data_direction dir;
|
|
dma_addr_t buf;
|
|
dma_addr_t next;
|
|
size_t len;
|
|
size_t left;
|
|
unsigned int ctx;
|
|
unsigned int irq_on;
|
|
spinlock_t lock;
|
|
};
|
|
static struct parport_ip32_dma_data parport_ip32_dma;
|
|
|
|
/**
|
|
* parport_ip32_dma_setup_context - setup next DMA context
|
|
* @limit: maximum data size for the context
|
|
*
|
|
* The alignment constraints must be verified in caller function, and the
|
|
* parameter @limit must be set accordingly.
|
|
*/
|
|
static void parport_ip32_dma_setup_context(unsigned int limit)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&parport_ip32_dma.lock, flags);
|
|
if (parport_ip32_dma.left > 0) {
|
|
/* Note: ctxreg is "volatile" here only because
|
|
* mace->perif.ctrl.parport.context_a and context_b are
|
|
* "volatile". */
|
|
volatile u64 __iomem *ctxreg = (parport_ip32_dma.ctx == 0) ?
|
|
&mace->perif.ctrl.parport.context_a :
|
|
&mace->perif.ctrl.parport.context_b;
|
|
u64 count;
|
|
u64 ctxval;
|
|
if (parport_ip32_dma.left <= limit) {
|
|
count = parport_ip32_dma.left;
|
|
ctxval = MACEPAR_CONTEXT_LASTFLAG;
|
|
} else {
|
|
count = limit;
|
|
ctxval = 0;
|
|
}
|
|
|
|
pr_trace(NULL,
|
|
"(%u): 0x%04x:0x%04x, %u -> %u%s",
|
|
limit,
|
|
(unsigned int)parport_ip32_dma.buf,
|
|
(unsigned int)parport_ip32_dma.next,
|
|
(unsigned int)count,
|
|
parport_ip32_dma.ctx, ctxval ? "*" : "");
|
|
|
|
ctxval |= parport_ip32_dma.next &
|
|
MACEPAR_CONTEXT_BASEADDR_MASK;
|
|
ctxval |= ((count - 1) << MACEPAR_CONTEXT_DATALEN_SHIFT) &
|
|
MACEPAR_CONTEXT_DATALEN_MASK;
|
|
writeq(ctxval, ctxreg);
|
|
parport_ip32_dma.next += count;
|
|
parport_ip32_dma.left -= count;
|
|
parport_ip32_dma.ctx ^= 1U;
|
|
}
|
|
/* If there is nothing more to send, disable IRQs to avoid to
|
|
* face an IRQ storm which can lock the machine. Disable them
|
|
* only once. */
|
|
if (parport_ip32_dma.left == 0 && parport_ip32_dma.irq_on) {
|
|
pr_debug(PPIP32 "IRQ off (ctx)\n");
|
|
disable_irq_nosync(MACEISA_PAR_CTXA_IRQ);
|
|
disable_irq_nosync(MACEISA_PAR_CTXB_IRQ);
|
|
parport_ip32_dma.irq_on = 0;
|
|
}
|
|
spin_unlock_irqrestore(&parport_ip32_dma.lock, flags);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_dma_interrupt - DMA interrupt handler
|
|
* @irq: interrupt number
|
|
* @dev_id: unused
|
|
*/
|
|
static irqreturn_t parport_ip32_dma_interrupt(int irq, void *dev_id)
|
|
{
|
|
if (parport_ip32_dma.left)
|
|
pr_trace(NULL, "(%d): ctx=%d", irq, parport_ip32_dma.ctx);
|
|
parport_ip32_dma_setup_context(MACEPAR_CONTEXT_DATA_BOUND);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#if DEBUG_PARPORT_IP32
|
|
static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)
|
|
{
|
|
pr_trace1(NULL, "(%d)", irq);
|
|
return IRQ_HANDLED;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* parport_ip32_dma_start - begins a DMA transfer
|
|
* @p: partport to work on
|
|
* @dir: DMA direction: DMA_TO_DEVICE or DMA_FROM_DEVICE
|
|
* @addr: pointer to data buffer
|
|
* @count: buffer size
|
|
*
|
|
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
|
|
* correctly balanced.
|
|
*/
|
|
static int parport_ip32_dma_start(struct parport *p,
|
|
enum dma_data_direction dir, void *addr, size_t count)
|
|
{
|
|
unsigned int limit;
|
|
u64 ctrl;
|
|
|
|
pr_trace(NULL, "(%d, %lu)", dir, (unsigned long)count);
|
|
|
|
/* FIXME - add support for DMA_FROM_DEVICE. In this case, buffer must
|
|
* be 64 bytes aligned. */
|
|
BUG_ON(dir != DMA_TO_DEVICE);
|
|
|
|
/* Reset DMA controller */
|
|
ctrl = MACEPAR_CTLSTAT_RESET;
|
|
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
|
|
|
|
/* DMA IRQs should normally be enabled */
|
|
if (!parport_ip32_dma.irq_on) {
|
|
WARN_ON(1);
|
|
enable_irq(MACEISA_PAR_CTXA_IRQ);
|
|
enable_irq(MACEISA_PAR_CTXB_IRQ);
|
|
parport_ip32_dma.irq_on = 1;
|
|
}
|
|
|
|
/* Prepare DMA pointers */
|
|
parport_ip32_dma.dir = dir;
|
|
parport_ip32_dma.buf = dma_map_single(&p->bus_dev, addr, count, dir);
|
|
parport_ip32_dma.len = count;
|
|
parport_ip32_dma.next = parport_ip32_dma.buf;
|
|
parport_ip32_dma.left = parport_ip32_dma.len;
|
|
parport_ip32_dma.ctx = 0;
|
|
|
|
/* Setup DMA direction and first two contexts */
|
|
ctrl = (dir == DMA_TO_DEVICE) ? 0 : MACEPAR_CTLSTAT_DIRECTION;
|
|
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
|
|
/* Single transfer should not cross a 4K page boundary */
|
|
limit = MACEPAR_CONTEXT_DATA_BOUND -
|
|
(parport_ip32_dma.next & (MACEPAR_CONTEXT_DATA_BOUND - 1));
|
|
parport_ip32_dma_setup_context(limit);
|
|
parport_ip32_dma_setup_context(MACEPAR_CONTEXT_DATA_BOUND);
|
|
|
|
/* Real start of DMA transfer */
|
|
ctrl |= MACEPAR_CTLSTAT_ENABLE;
|
|
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_dma_stop - ends a running DMA transfer
|
|
* @p: partport to work on
|
|
*
|
|
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
|
|
* correctly balanced.
|
|
*/
|
|
static void parport_ip32_dma_stop(struct parport *p)
|
|
{
|
|
u64 ctx_a;
|
|
u64 ctx_b;
|
|
u64 ctrl;
|
|
u64 diag;
|
|
size_t res[2]; /* {[0] = res_a, [1] = res_b} */
|
|
|
|
pr_trace(NULL, "()");
|
|
|
|
/* Disable IRQs */
|
|
spin_lock_irq(&parport_ip32_dma.lock);
|
|
if (parport_ip32_dma.irq_on) {
|
|
pr_debug(PPIP32 "IRQ off (stop)\n");
|
|
disable_irq_nosync(MACEISA_PAR_CTXA_IRQ);
|
|
disable_irq_nosync(MACEISA_PAR_CTXB_IRQ);
|
|
parport_ip32_dma.irq_on = 0;
|
|
}
|
|
spin_unlock_irq(&parport_ip32_dma.lock);
|
|
/* Force IRQ synchronization, even if the IRQs were disabled
|
|
* elsewhere. */
|
|
synchronize_irq(MACEISA_PAR_CTXA_IRQ);
|
|
synchronize_irq(MACEISA_PAR_CTXB_IRQ);
|
|
|
|
/* Stop DMA transfer */
|
|
ctrl = readq(&mace->perif.ctrl.parport.cntlstat);
|
|
ctrl &= ~MACEPAR_CTLSTAT_ENABLE;
|
|
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
|
|
|
|
/* Adjust residue (parport_ip32_dma.left) */
|
|
ctx_a = readq(&mace->perif.ctrl.parport.context_a);
|
|
ctx_b = readq(&mace->perif.ctrl.parport.context_b);
|
|
ctrl = readq(&mace->perif.ctrl.parport.cntlstat);
|
|
diag = readq(&mace->perif.ctrl.parport.diagnostic);
|
|
res[0] = (ctrl & MACEPAR_CTLSTAT_CTXA_VALID) ?
|
|
1 + ((ctx_a & MACEPAR_CONTEXT_DATALEN_MASK) >>
|
|
MACEPAR_CONTEXT_DATALEN_SHIFT) :
|
|
0;
|
|
res[1] = (ctrl & MACEPAR_CTLSTAT_CTXB_VALID) ?
|
|
1 + ((ctx_b & MACEPAR_CONTEXT_DATALEN_MASK) >>
|
|
MACEPAR_CONTEXT_DATALEN_SHIFT) :
|
|
0;
|
|
if (diag & MACEPAR_DIAG_DMACTIVE)
|
|
res[(diag & MACEPAR_DIAG_CTXINUSE) != 0] =
|
|
1 + ((diag & MACEPAR_DIAG_CTRMASK) >>
|
|
MACEPAR_DIAG_CTRSHIFT);
|
|
parport_ip32_dma.left += res[0] + res[1];
|
|
|
|
/* Reset DMA controller, and re-enable IRQs */
|
|
ctrl = MACEPAR_CTLSTAT_RESET;
|
|
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
|
|
pr_debug(PPIP32 "IRQ on (stop)\n");
|
|
enable_irq(MACEISA_PAR_CTXA_IRQ);
|
|
enable_irq(MACEISA_PAR_CTXB_IRQ);
|
|
parport_ip32_dma.irq_on = 1;
|
|
|
|
dma_unmap_single(&p->bus_dev, parport_ip32_dma.buf,
|
|
parport_ip32_dma.len, parport_ip32_dma.dir);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_dma_get_residue - get residue from last DMA transfer
|
|
*
|
|
* Returns the number of bytes remaining from last DMA transfer.
|
|
*/
|
|
static inline size_t parport_ip32_dma_get_residue(void)
|
|
{
|
|
return parport_ip32_dma.left;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_dma_register - initialize DMA engine
|
|
*
|
|
* Returns zero for success.
|
|
*/
|
|
static int parport_ip32_dma_register(void)
|
|
{
|
|
int err;
|
|
|
|
spin_lock_init(&parport_ip32_dma.lock);
|
|
parport_ip32_dma.irq_on = 1;
|
|
|
|
/* Reset DMA controller */
|
|
writeq(MACEPAR_CTLSTAT_RESET, &mace->perif.ctrl.parport.cntlstat);
|
|
|
|
/* Request IRQs */
|
|
err = request_irq(MACEISA_PAR_CTXA_IRQ, parport_ip32_dma_interrupt,
|
|
0, "parport_ip32", NULL);
|
|
if (err)
|
|
goto fail_a;
|
|
err = request_irq(MACEISA_PAR_CTXB_IRQ, parport_ip32_dma_interrupt,
|
|
0, "parport_ip32", NULL);
|
|
if (err)
|
|
goto fail_b;
|
|
#if DEBUG_PARPORT_IP32
|
|
/* FIXME - what is this IRQ for? */
|
|
err = request_irq(MACEISA_PAR_MERR_IRQ, parport_ip32_merr_interrupt,
|
|
0, "parport_ip32", NULL);
|
|
if (err)
|
|
goto fail_merr;
|
|
#endif
|
|
return 0;
|
|
|
|
#if DEBUG_PARPORT_IP32
|
|
fail_merr:
|
|
free_irq(MACEISA_PAR_CTXB_IRQ, NULL);
|
|
#endif
|
|
fail_b:
|
|
free_irq(MACEISA_PAR_CTXA_IRQ, NULL);
|
|
fail_a:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_dma_unregister - release and free resources for DMA engine
|
|
*/
|
|
static void parport_ip32_dma_unregister(void)
|
|
{
|
|
#if DEBUG_PARPORT_IP32
|
|
free_irq(MACEISA_PAR_MERR_IRQ, NULL);
|
|
#endif
|
|
free_irq(MACEISA_PAR_CTXB_IRQ, NULL);
|
|
free_irq(MACEISA_PAR_CTXA_IRQ, NULL);
|
|
}
|
|
|
|
/*--- Interrupt handlers and associates --------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_wakeup - wakes up code waiting for an interrupt
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline void parport_ip32_wakeup(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
complete(&priv->irq_complete);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_interrupt - interrupt handler
|
|
* @irq: interrupt number
|
|
* @dev_id: pointer to &struct parport
|
|
*
|
|
* Caught interrupts are forwarded to the upper parport layer if IRQ_mode is
|
|
* %PARPORT_IP32_IRQ_FWD.
|
|
*/
|
|
static irqreturn_t parport_ip32_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct parport * const p = dev_id;
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
enum parport_ip32_irq_mode irq_mode = priv->irq_mode;
|
|
|
|
switch (irq_mode) {
|
|
case PARPORT_IP32_IRQ_FWD:
|
|
return parport_irq_handler(irq, dev_id);
|
|
|
|
case PARPORT_IP32_IRQ_HERE:
|
|
parport_ip32_wakeup(p);
|
|
break;
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*--- Some utility function to manipulate ECR register -----------------*/
|
|
|
|
/**
|
|
* parport_ip32_read_econtrol - read contents of the ECR register
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline unsigned int parport_ip32_read_econtrol(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return readb(priv->regs.ecr);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_write_econtrol - write new contents to the ECR register
|
|
* @p: pointer to &struct parport
|
|
* @c: new value to write
|
|
*/
|
|
static inline void parport_ip32_write_econtrol(struct parport *p,
|
|
unsigned int c)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
writeb(c, priv->regs.ecr);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_frob_econtrol - change bits from the ECR register
|
|
* @p: pointer to &struct parport
|
|
* @mask: bit mask of bits to change
|
|
* @val: new value for changed bits
|
|
*
|
|
* Read from the ECR, mask out the bits in @mask, exclusive-or with the bits
|
|
* in @val, and write the result to the ECR.
|
|
*/
|
|
static inline void parport_ip32_frob_econtrol(struct parport *p,
|
|
unsigned int mask,
|
|
unsigned int val)
|
|
{
|
|
unsigned int c;
|
|
c = (parport_ip32_read_econtrol(p) & ~mask) ^ val;
|
|
parport_ip32_write_econtrol(p, c);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_set_mode - change mode of ECP port
|
|
* @p: pointer to &struct parport
|
|
* @mode: new mode to write in ECR
|
|
*
|
|
* ECR is reset in a sane state (interrupts and DMA disabled), and placed in
|
|
* mode @mode. Go through PS2 mode if needed.
|
|
*/
|
|
static void parport_ip32_set_mode(struct parport *p, unsigned int mode)
|
|
{
|
|
unsigned int omode;
|
|
|
|
mode &= ECR_MODE_MASK;
|
|
omode = parport_ip32_read_econtrol(p) & ECR_MODE_MASK;
|
|
|
|
if (!(mode == ECR_MODE_SPP || mode == ECR_MODE_PS2
|
|
|| omode == ECR_MODE_SPP || omode == ECR_MODE_PS2)) {
|
|
/* We have to go through PS2 mode */
|
|
unsigned int ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
|
|
parport_ip32_write_econtrol(p, ecr);
|
|
}
|
|
parport_ip32_write_econtrol(p, mode | ECR_nERRINTR | ECR_SERVINTR);
|
|
}
|
|
|
|
/*--- Basic functions needed for parport -------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_read_data - return current contents of the DATA register
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline unsigned char parport_ip32_read_data(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return readb(priv->regs.data);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_write_data - set new contents for the DATA register
|
|
* @p: pointer to &struct parport
|
|
* @d: new value to write
|
|
*/
|
|
static inline void parport_ip32_write_data(struct parport *p, unsigned char d)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
writeb(d, priv->regs.data);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_read_status - return current contents of the DSR register
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline unsigned char parport_ip32_read_status(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return readb(priv->regs.dsr);
|
|
}
|
|
|
|
/**
|
|
* __parport_ip32_read_control - return cached contents of the DCR register
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline unsigned int __parport_ip32_read_control(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return priv->dcr_cache; /* use soft copy */
|
|
}
|
|
|
|
/**
|
|
* __parport_ip32_write_control - set new contents for the DCR register
|
|
* @p: pointer to &struct parport
|
|
* @c: new value to write
|
|
*/
|
|
static inline void __parport_ip32_write_control(struct parport *p,
|
|
unsigned int c)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
CHECK_EXTRA_BITS(p, c, priv->dcr_writable);
|
|
c &= priv->dcr_writable; /* only writable bits */
|
|
writeb(c, priv->regs.dcr);
|
|
priv->dcr_cache = c; /* update soft copy */
|
|
}
|
|
|
|
/**
|
|
* __parport_ip32_frob_control - change bits from the DCR register
|
|
* @p: pointer to &struct parport
|
|
* @mask: bit mask of bits to change
|
|
* @val: new value for changed bits
|
|
*
|
|
* This is equivalent to read from the DCR, mask out the bits in @mask,
|
|
* exclusive-or with the bits in @val, and write the result to the DCR.
|
|
* Actually, the cached contents of the DCR is used.
|
|
*/
|
|
static inline void __parport_ip32_frob_control(struct parport *p,
|
|
unsigned int mask,
|
|
unsigned int val)
|
|
{
|
|
unsigned int c;
|
|
c = (__parport_ip32_read_control(p) & ~mask) ^ val;
|
|
__parport_ip32_write_control(p, c);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_read_control - return cached contents of the DCR register
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* The return value is masked so as to only return the value of %DCR_STROBE,
|
|
* %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
|
|
*/
|
|
static inline unsigned char parport_ip32_read_control(struct parport *p)
|
|
{
|
|
const unsigned int rm =
|
|
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
|
|
return __parport_ip32_read_control(p) & rm;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_write_control - set new contents for the DCR register
|
|
* @p: pointer to &struct parport
|
|
* @c: new value to write
|
|
*
|
|
* The value is masked so as to only change the value of %DCR_STROBE,
|
|
* %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
|
|
*/
|
|
static inline void parport_ip32_write_control(struct parport *p,
|
|
unsigned char c)
|
|
{
|
|
const unsigned int wm =
|
|
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
|
|
CHECK_EXTRA_BITS(p, c, wm);
|
|
__parport_ip32_frob_control(p, wm, c & wm);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_frob_control - change bits from the DCR register
|
|
* @p: pointer to &struct parport
|
|
* @mask: bit mask of bits to change
|
|
* @val: new value for changed bits
|
|
*
|
|
* This differs from __parport_ip32_frob_control() in that it only allows to
|
|
* change the value of %DCR_STROBE, %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
|
|
*/
|
|
static inline unsigned char parport_ip32_frob_control(struct parport *p,
|
|
unsigned char mask,
|
|
unsigned char val)
|
|
{
|
|
const unsigned int wm =
|
|
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
|
|
CHECK_EXTRA_BITS(p, mask, wm);
|
|
CHECK_EXTRA_BITS(p, val, wm);
|
|
__parport_ip32_frob_control(p, mask & wm, val & wm);
|
|
return parport_ip32_read_control(p);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_disable_irq - disable interrupts on the rising edge of nACK
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline void parport_ip32_disable_irq(struct parport *p)
|
|
{
|
|
__parport_ip32_frob_control(p, DCR_IRQ, 0);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_enable_irq - enable interrupts on the rising edge of nACK
|
|
* @p: pointer to &struct parport
|
|
*/
|
|
static inline void parport_ip32_enable_irq(struct parport *p)
|
|
{
|
|
__parport_ip32_frob_control(p, DCR_IRQ, DCR_IRQ);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_data_forward - enable host-to-peripheral communications
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* Enable the data line drivers, for 8-bit host-to-peripheral communications.
|
|
*/
|
|
static inline void parport_ip32_data_forward(struct parport *p)
|
|
{
|
|
__parport_ip32_frob_control(p, DCR_DIR, 0);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_data_reverse - enable peripheral-to-host communications
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* Place the data bus in a high impedance state, if @p->modes has the
|
|
* PARPORT_MODE_TRISTATE bit set.
|
|
*/
|
|
static inline void parport_ip32_data_reverse(struct parport *p)
|
|
{
|
|
__parport_ip32_frob_control(p, DCR_DIR, DCR_DIR);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_init_state - for core parport code
|
|
* @dev: pointer to &struct pardevice
|
|
* @s: pointer to &struct parport_state to initialize
|
|
*/
|
|
static void parport_ip32_init_state(struct pardevice *dev,
|
|
struct parport_state *s)
|
|
{
|
|
s->u.ip32.dcr = DCR_SELECT | DCR_nINIT;
|
|
s->u.ip32.ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_save_state - for core parport code
|
|
* @p: pointer to &struct parport
|
|
* @s: pointer to &struct parport_state to save state to
|
|
*/
|
|
static void parport_ip32_save_state(struct parport *p,
|
|
struct parport_state *s)
|
|
{
|
|
s->u.ip32.dcr = __parport_ip32_read_control(p);
|
|
s->u.ip32.ecr = parport_ip32_read_econtrol(p);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_restore_state - for core parport code
|
|
* @p: pointer to &struct parport
|
|
* @s: pointer to &struct parport_state to restore state from
|
|
*/
|
|
static void parport_ip32_restore_state(struct parport *p,
|
|
struct parport_state *s)
|
|
{
|
|
parport_ip32_set_mode(p, s->u.ip32.ecr & ECR_MODE_MASK);
|
|
parport_ip32_write_econtrol(p, s->u.ip32.ecr);
|
|
__parport_ip32_write_control(p, s->u.ip32.dcr);
|
|
}
|
|
|
|
/*--- EPP mode functions -----------------------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_clear_epp_timeout - clear Timeout bit in EPP mode
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* Returns 1 if the Timeout bit is clear, and 0 otherwise.
|
|
*/
|
|
static unsigned int parport_ip32_clear_epp_timeout(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
unsigned int cleared;
|
|
|
|
if (!(parport_ip32_read_status(p) & DSR_TIMEOUT))
|
|
cleared = 1;
|
|
else {
|
|
unsigned int r;
|
|
/* To clear timeout some chips require double read */
|
|
parport_ip32_read_status(p);
|
|
r = parport_ip32_read_status(p);
|
|
/* Some reset by writing 1 */
|
|
writeb(r | DSR_TIMEOUT, priv->regs.dsr);
|
|
/* Others by writing 0 */
|
|
writeb(r & ~DSR_TIMEOUT, priv->regs.dsr);
|
|
|
|
r = parport_ip32_read_status(p);
|
|
cleared = !(r & DSR_TIMEOUT);
|
|
}
|
|
|
|
pr_trace(p, "(): %s", cleared ? "cleared" : "failed");
|
|
return cleared;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_read - generic EPP read function
|
|
* @eppreg: I/O register to read from
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer to store read data
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_read(void __iomem *eppreg,
|
|
struct parport *p, void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
size_t got;
|
|
parport_ip32_set_mode(p, ECR_MODE_EPP);
|
|
parport_ip32_data_reverse(p);
|
|
parport_ip32_write_control(p, DCR_nINIT);
|
|
if ((flags & PARPORT_EPP_FAST) && (len > 1)) {
|
|
readsb(eppreg, buf, len);
|
|
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
|
|
parport_ip32_clear_epp_timeout(p);
|
|
return -EIO;
|
|
}
|
|
got = len;
|
|
} else {
|
|
u8 *bufp = buf;
|
|
for (got = 0; got < len; got++) {
|
|
*bufp++ = readb(eppreg);
|
|
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
|
|
parport_ip32_clear_epp_timeout(p);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
return got;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_write - generic EPP write function
|
|
* @eppreg: I/O register to write to
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_write(void __iomem *eppreg,
|
|
struct parport *p, const void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
size_t written;
|
|
parport_ip32_set_mode(p, ECR_MODE_EPP);
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_write_control(p, DCR_nINIT);
|
|
if ((flags & PARPORT_EPP_FAST) && (len > 1)) {
|
|
writesb(eppreg, buf, len);
|
|
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
|
|
parport_ip32_clear_epp_timeout(p);
|
|
return -EIO;
|
|
}
|
|
written = len;
|
|
} else {
|
|
const u8 *bufp = buf;
|
|
for (written = 0; written < len; written++) {
|
|
writeb(*bufp++, eppreg);
|
|
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
|
|
parport_ip32_clear_epp_timeout(p);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
return written;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_read_data - read a block of data in EPP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer to store read data
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_read_data(struct parport *p, void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return parport_ip32_epp_read(priv->regs.eppData0, p, buf, len, flags);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_write_data - write a block of data in EPP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_write_data(struct parport *p, const void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return parport_ip32_epp_write(priv->regs.eppData0, p, buf, len, flags);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_read_addr - read a block of addresses in EPP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer to store read data
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_read_addr(struct parport *p, void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return parport_ip32_epp_read(priv->regs.eppAddr, p, buf, len, flags);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_epp_write_addr - write a block of addresses in EPP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
* @flags: may be PARPORT_EPP_FAST
|
|
*/
|
|
static size_t parport_ip32_epp_write_addr(struct parport *p, const void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
return parport_ip32_epp_write(priv->regs.eppAddr, p, buf, len, flags);
|
|
}
|
|
|
|
/*--- ECP mode functions (FIFO) ----------------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_fifo_wait_break - check if the waiting function should return
|
|
* @p: pointer to &struct parport
|
|
* @expire: timeout expiring date, in jiffies
|
|
*
|
|
* parport_ip32_fifo_wait_break() checks if the waiting function should return
|
|
* immediately or not. The break conditions are:
|
|
* - expired timeout;
|
|
* - a pending signal;
|
|
* - nFault asserted low.
|
|
* This function also calls cond_resched().
|
|
*/
|
|
static unsigned int parport_ip32_fifo_wait_break(struct parport *p,
|
|
unsigned long expire)
|
|
{
|
|
cond_resched();
|
|
if (time_after(jiffies, expire)) {
|
|
pr_debug1(PPIP32 "%s: FIFO write timed out\n", p->name);
|
|
return 1;
|
|
}
|
|
if (signal_pending(current)) {
|
|
pr_debug1(PPIP32 "%s: Signal pending\n", p->name);
|
|
return 1;
|
|
}
|
|
if (!(parport_ip32_read_status(p) & DSR_nFAULT)) {
|
|
pr_debug1(PPIP32 "%s: nFault asserted low\n", p->name);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fwp_wait_polling - wait for FIFO to empty (polling)
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* Returns the number of bytes that can safely be written in the FIFO. A
|
|
* return value of zero means that the calling function should terminate as
|
|
* fast as possible.
|
|
*/
|
|
static unsigned int parport_ip32_fwp_wait_polling(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport * const physport = p->physport;
|
|
unsigned long expire;
|
|
unsigned int count;
|
|
unsigned int ecr;
|
|
|
|
expire = jiffies + physport->cad->timeout;
|
|
count = 0;
|
|
while (1) {
|
|
if (parport_ip32_fifo_wait_break(p, expire))
|
|
break;
|
|
|
|
/* Check FIFO state. We do nothing when the FIFO is nor full,
|
|
* nor empty. It appears that the FIFO full bit is not always
|
|
* reliable, the FIFO state is sometimes wrongly reported, and
|
|
* the chip gets confused if we give it another byte. */
|
|
ecr = parport_ip32_read_econtrol(p);
|
|
if (ecr & ECR_F_EMPTY) {
|
|
/* FIFO is empty, fill it up */
|
|
count = priv->fifo_depth;
|
|
break;
|
|
}
|
|
|
|
/* Wait a moment... */
|
|
udelay(FIFO_POLLING_INTERVAL);
|
|
} /* while (1) */
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fwp_wait_interrupt - wait for FIFO to empty (interrupt-driven)
|
|
* @p: pointer to &struct parport
|
|
*
|
|
* Returns the number of bytes that can safely be written in the FIFO. A
|
|
* return value of zero means that the calling function should terminate as
|
|
* fast as possible.
|
|
*/
|
|
static unsigned int parport_ip32_fwp_wait_interrupt(struct parport *p)
|
|
{
|
|
static unsigned int lost_interrupt = 0;
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport * const physport = p->physport;
|
|
unsigned long nfault_timeout;
|
|
unsigned long expire;
|
|
unsigned int count;
|
|
unsigned int ecr;
|
|
|
|
nfault_timeout = min((unsigned long)physport->cad->timeout,
|
|
msecs_to_jiffies(FIFO_NFAULT_TIMEOUT));
|
|
expire = jiffies + physport->cad->timeout;
|
|
count = 0;
|
|
while (1) {
|
|
if (parport_ip32_fifo_wait_break(p, expire))
|
|
break;
|
|
|
|
/* Initialize mutex used to take interrupts into account */
|
|
reinit_completion(&priv->irq_complete);
|
|
|
|
/* Enable serviceIntr */
|
|
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
|
|
|
|
/* Enabling serviceIntr while the FIFO is empty does not
|
|
* always generate an interrupt, so check for emptiness
|
|
* now. */
|
|
ecr = parport_ip32_read_econtrol(p);
|
|
if (!(ecr & ECR_F_EMPTY)) {
|
|
/* FIFO is not empty: wait for an interrupt or a
|
|
* timeout to occur */
|
|
wait_for_completion_interruptible_timeout(
|
|
&priv->irq_complete, nfault_timeout);
|
|
ecr = parport_ip32_read_econtrol(p);
|
|
if ((ecr & ECR_F_EMPTY) && !(ecr & ECR_SERVINTR)
|
|
&& !lost_interrupt) {
|
|
pr_warn(PPIP32 "%s: lost interrupt in %s\n",
|
|
p->name, __func__);
|
|
lost_interrupt = 1;
|
|
}
|
|
}
|
|
|
|
/* Disable serviceIntr */
|
|
parport_ip32_frob_econtrol(p, ECR_SERVINTR, ECR_SERVINTR);
|
|
|
|
/* Check FIFO state */
|
|
if (ecr & ECR_F_EMPTY) {
|
|
/* FIFO is empty, fill it up */
|
|
count = priv->fifo_depth;
|
|
break;
|
|
} else if (ecr & ECR_SERVINTR) {
|
|
/* FIFO is not empty, but we know that can safely push
|
|
* writeIntrThreshold bytes into it */
|
|
count = priv->writeIntrThreshold;
|
|
break;
|
|
}
|
|
/* FIFO is not empty, and we did not get any interrupt.
|
|
* Either it's time to check for nFault, or a signal is
|
|
* pending. This is verified in
|
|
* parport_ip32_fifo_wait_break(), so we continue the loop. */
|
|
} /* while (1) */
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fifo_write_block_pio - write a block of data (PIO mode)
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
*
|
|
* Uses PIO to write the contents of the buffer @buf into the parallel port
|
|
* FIFO. Returns the number of bytes that were actually written. It can work
|
|
* with or without the help of interrupts. The parallel port must be
|
|
* correctly initialized before calling parport_ip32_fifo_write_block_pio().
|
|
*/
|
|
static size_t parport_ip32_fifo_write_block_pio(struct parport *p,
|
|
const void *buf, size_t len)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
const u8 *bufp = buf;
|
|
size_t left = len;
|
|
|
|
priv->irq_mode = PARPORT_IP32_IRQ_HERE;
|
|
|
|
while (left > 0) {
|
|
unsigned int count;
|
|
|
|
count = (p->irq == PARPORT_IRQ_NONE) ?
|
|
parport_ip32_fwp_wait_polling(p) :
|
|
parport_ip32_fwp_wait_interrupt(p);
|
|
if (count == 0)
|
|
break; /* Transmission should be stopped */
|
|
if (count > left)
|
|
count = left;
|
|
if (count == 1) {
|
|
writeb(*bufp, priv->regs.fifo);
|
|
bufp++, left--;
|
|
} else {
|
|
writesb(priv->regs.fifo, bufp, count);
|
|
bufp += count, left -= count;
|
|
}
|
|
}
|
|
|
|
priv->irq_mode = PARPORT_IP32_IRQ_FWD;
|
|
|
|
return len - left;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fifo_write_block_dma - write a block of data (DMA mode)
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
*
|
|
* Uses DMA to write the contents of the buffer @buf into the parallel port
|
|
* FIFO. Returns the number of bytes that were actually written. The
|
|
* parallel port must be correctly initialized before calling
|
|
* parport_ip32_fifo_write_block_dma().
|
|
*/
|
|
static size_t parport_ip32_fifo_write_block_dma(struct parport *p,
|
|
const void *buf, size_t len)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport * const physport = p->physport;
|
|
unsigned long nfault_timeout;
|
|
unsigned long expire;
|
|
size_t written;
|
|
unsigned int ecr;
|
|
|
|
priv->irq_mode = PARPORT_IP32_IRQ_HERE;
|
|
|
|
parport_ip32_dma_start(p, DMA_TO_DEVICE, (void *)buf, len);
|
|
reinit_completion(&priv->irq_complete);
|
|
parport_ip32_frob_econtrol(p, ECR_DMAEN | ECR_SERVINTR, ECR_DMAEN);
|
|
|
|
nfault_timeout = min((unsigned long)physport->cad->timeout,
|
|
msecs_to_jiffies(FIFO_NFAULT_TIMEOUT));
|
|
expire = jiffies + physport->cad->timeout;
|
|
while (1) {
|
|
if (parport_ip32_fifo_wait_break(p, expire))
|
|
break;
|
|
wait_for_completion_interruptible_timeout(&priv->irq_complete,
|
|
nfault_timeout);
|
|
ecr = parport_ip32_read_econtrol(p);
|
|
if (ecr & ECR_SERVINTR)
|
|
break; /* DMA transfer just finished */
|
|
}
|
|
parport_ip32_dma_stop(p);
|
|
written = len - parport_ip32_dma_get_residue();
|
|
|
|
priv->irq_mode = PARPORT_IP32_IRQ_FWD;
|
|
|
|
return written;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fifo_write_block - write a block of data
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
*
|
|
* Uses PIO or DMA to write the contents of the buffer @buf into the parallel
|
|
* p FIFO. Returns the number of bytes that were actually written.
|
|
*/
|
|
static size_t parport_ip32_fifo_write_block(struct parport *p,
|
|
const void *buf, size_t len)
|
|
{
|
|
size_t written = 0;
|
|
if (len)
|
|
/* FIXME - Maybe some threshold value should be set for @len
|
|
* under which we revert to PIO mode? */
|
|
written = (p->modes & PARPORT_MODE_DMA) ?
|
|
parport_ip32_fifo_write_block_dma(p, buf, len) :
|
|
parport_ip32_fifo_write_block_pio(p, buf, len);
|
|
return written;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_drain_fifo - wait for FIFO to empty
|
|
* @p: pointer to &struct parport
|
|
* @timeout: timeout, in jiffies
|
|
*
|
|
* This function waits for FIFO to empty. It returns 1 when FIFO is empty, or
|
|
* 0 if the timeout @timeout is reached before, or if a signal is pending.
|
|
*/
|
|
static unsigned int parport_ip32_drain_fifo(struct parport *p,
|
|
unsigned long timeout)
|
|
{
|
|
unsigned long expire = jiffies + timeout;
|
|
unsigned int polling_interval;
|
|
unsigned int counter;
|
|
|
|
/* Busy wait for approx. 200us */
|
|
for (counter = 0; counter < 40; counter++) {
|
|
if (parport_ip32_read_econtrol(p) & ECR_F_EMPTY)
|
|
break;
|
|
if (time_after(jiffies, expire))
|
|
break;
|
|
if (signal_pending(current))
|
|
break;
|
|
udelay(5);
|
|
}
|
|
/* Poll slowly. Polling interval starts with 1 millisecond, and is
|
|
* increased exponentially until 128. */
|
|
polling_interval = 1; /* msecs */
|
|
while (!(parport_ip32_read_econtrol(p) & ECR_F_EMPTY)) {
|
|
if (time_after_eq(jiffies, expire))
|
|
break;
|
|
msleep_interruptible(polling_interval);
|
|
if (signal_pending(current))
|
|
break;
|
|
if (polling_interval < 128)
|
|
polling_interval *= 2;
|
|
}
|
|
|
|
return !!(parport_ip32_read_econtrol(p) & ECR_F_EMPTY);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_get_fifo_residue - reset FIFO
|
|
* @p: pointer to &struct parport
|
|
* @mode: current operation mode (ECR_MODE_PPF or ECR_MODE_ECP)
|
|
*
|
|
* This function resets FIFO, and returns the number of bytes remaining in it.
|
|
*/
|
|
static unsigned int parport_ip32_get_fifo_residue(struct parport *p,
|
|
unsigned int mode)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
unsigned int residue;
|
|
unsigned int cnfga;
|
|
|
|
/* FIXME - We are missing one byte if the printer is off-line. I
|
|
* don't know how to detect this. It looks that the full bit is not
|
|
* always reliable. For the moment, the problem is avoided in most
|
|
* cases by testing for BUSY in parport_ip32_compat_write_data().
|
|
*/
|
|
if (parport_ip32_read_econtrol(p) & ECR_F_EMPTY)
|
|
residue = 0;
|
|
else {
|
|
pr_debug1(PPIP32 "%s: FIFO is stuck\n", p->name);
|
|
|
|
/* Stop all transfers.
|
|
*
|
|
* Microsoft's document instructs to drive DCR_STROBE to 0,
|
|
* but it doesn't work (at least in Compatibility mode, not
|
|
* tested in ECP mode). Switching directly to Test mode (as
|
|
* in parport_pc) is not an option: it does confuse the port,
|
|
* ECP service interrupts are no more working after that. A
|
|
* hard reset is then needed to revert to a sane state.
|
|
*
|
|
* Let's hope that the FIFO is really stuck and that the
|
|
* peripheral doesn't wake up now.
|
|
*/
|
|
parport_ip32_frob_control(p, DCR_STROBE, 0);
|
|
|
|
/* Fill up FIFO */
|
|
for (residue = priv->fifo_depth; residue > 0; residue--) {
|
|
if (parport_ip32_read_econtrol(p) & ECR_F_FULL)
|
|
break;
|
|
writeb(0x00, priv->regs.fifo);
|
|
}
|
|
}
|
|
if (residue)
|
|
pr_debug1(PPIP32 "%s: %d PWord%s left in FIFO\n",
|
|
p->name, residue,
|
|
(residue == 1) ? " was" : "s were");
|
|
|
|
/* Now reset the FIFO */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
|
|
/* Host recovery for ECP mode */
|
|
if (mode == ECR_MODE_ECP) {
|
|
parport_ip32_data_reverse(p);
|
|
parport_ip32_frob_control(p, DCR_nINIT, 0);
|
|
if (parport_wait_peripheral(p, DSR_PERROR, 0))
|
|
pr_debug1(PPIP32 "%s: PEerror timeout 1 in %s\n",
|
|
p->name, __func__);
|
|
parport_ip32_frob_control(p, DCR_STROBE, DCR_STROBE);
|
|
parport_ip32_frob_control(p, DCR_nINIT, DCR_nINIT);
|
|
if (parport_wait_peripheral(p, DSR_PERROR, DSR_PERROR))
|
|
pr_debug1(PPIP32 "%s: PEerror timeout 2 in %s\n",
|
|
p->name, __func__);
|
|
}
|
|
|
|
/* Adjust residue if needed */
|
|
parport_ip32_set_mode(p, ECR_MODE_CFG);
|
|
cnfga = readb(priv->regs.cnfgA);
|
|
if (!(cnfga & CNFGA_nBYTEINTRANS)) {
|
|
pr_debug1(PPIP32 "%s: cnfgA contains 0x%02x\n",
|
|
p->name, cnfga);
|
|
pr_debug1(PPIP32 "%s: Accounting for extra byte\n",
|
|
p->name);
|
|
residue++;
|
|
}
|
|
|
|
/* Don't care about partial PWords since we do not support
|
|
* PWord != 1 byte. */
|
|
|
|
/* Back to forward PS2 mode. */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
parport_ip32_data_forward(p);
|
|
|
|
return residue;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_compat_write_data - write a block of data in SPP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
* @flags: ignored
|
|
*/
|
|
static size_t parport_ip32_compat_write_data(struct parport *p,
|
|
const void *buf, size_t len,
|
|
int flags)
|
|
{
|
|
static unsigned int ready_before = 1;
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport * const physport = p->physport;
|
|
size_t written = 0;
|
|
|
|
/* Special case: a timeout of zero means we cannot call schedule().
|
|
* Also if O_NONBLOCK is set then use the default implementation. */
|
|
if (physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
|
|
return parport_ieee1284_write_compat(p, buf, len, flags);
|
|
|
|
/* Reset FIFO, go in forward mode, and disable ackIntEn */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_disable_irq(p);
|
|
parport_ip32_set_mode(p, ECR_MODE_PPF);
|
|
physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
|
|
|
|
/* Wait for peripheral to become ready */
|
|
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
|
|
DSR_nBUSY | DSR_nFAULT)) {
|
|
/* Avoid to flood the logs */
|
|
if (ready_before)
|
|
pr_info(PPIP32 "%s: not ready in %s\n",
|
|
p->name, __func__);
|
|
ready_before = 0;
|
|
goto stop;
|
|
}
|
|
ready_before = 1;
|
|
|
|
written = parport_ip32_fifo_write_block(p, buf, len);
|
|
|
|
/* Wait FIFO to empty. Timeout is proportional to FIFO_depth. */
|
|
parport_ip32_drain_fifo(p, physport->cad->timeout * priv->fifo_depth);
|
|
|
|
/* Check for a potential residue */
|
|
written -= parport_ip32_get_fifo_residue(p, ECR_MODE_PPF);
|
|
|
|
/* Then, wait for BUSY to get low. */
|
|
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
|
|
printk(KERN_DEBUG PPIP32 "%s: BUSY timeout in %s\n",
|
|
p->name, __func__);
|
|
|
|
stop:
|
|
/* Reset FIFO */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
|
|
|
|
return written;
|
|
}
|
|
|
|
/*
|
|
* FIXME - Insert here parport_ip32_ecp_read_data().
|
|
*/
|
|
|
|
/**
|
|
* parport_ip32_ecp_write_data - write a block of data in ECP mode
|
|
* @p: pointer to &struct parport
|
|
* @buf: buffer of data to write
|
|
* @len: length of buffer @buf
|
|
* @flags: ignored
|
|
*/
|
|
static size_t parport_ip32_ecp_write_data(struct parport *p,
|
|
const void *buf, size_t len,
|
|
int flags)
|
|
{
|
|
static unsigned int ready_before = 1;
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport * const physport = p->physport;
|
|
size_t written = 0;
|
|
|
|
/* Special case: a timeout of zero means we cannot call schedule().
|
|
* Also if O_NONBLOCK is set then use the default implementation. */
|
|
if (physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
|
|
return parport_ieee1284_ecp_write_data(p, buf, len, flags);
|
|
|
|
/* Negotiate to forward mode if necessary. */
|
|
if (physport->ieee1284.phase != IEEE1284_PH_FWD_IDLE) {
|
|
/* Event 47: Set nInit high. */
|
|
parport_ip32_frob_control(p, DCR_nINIT | DCR_AUTOFD,
|
|
DCR_nINIT | DCR_AUTOFD);
|
|
|
|
/* Event 49: PError goes high. */
|
|
if (parport_wait_peripheral(p, DSR_PERROR, DSR_PERROR)) {
|
|
printk(KERN_DEBUG PPIP32 "%s: PError timeout in %s\n",
|
|
p->name, __func__);
|
|
physport->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Reset FIFO, go in forward mode, and disable ackIntEn */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_disable_irq(p);
|
|
parport_ip32_set_mode(p, ECR_MODE_ECP);
|
|
physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
|
|
|
|
/* Wait for peripheral to become ready */
|
|
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
|
|
DSR_nBUSY | DSR_nFAULT)) {
|
|
/* Avoid to flood the logs */
|
|
if (ready_before)
|
|
pr_info(PPIP32 "%s: not ready in %s\n",
|
|
p->name, __func__);
|
|
ready_before = 0;
|
|
goto stop;
|
|
}
|
|
ready_before = 1;
|
|
|
|
written = parport_ip32_fifo_write_block(p, buf, len);
|
|
|
|
/* Wait FIFO to empty. Timeout is proportional to FIFO_depth. */
|
|
parport_ip32_drain_fifo(p, physport->cad->timeout * priv->fifo_depth);
|
|
|
|
/* Check for a potential residue */
|
|
written -= parport_ip32_get_fifo_residue(p, ECR_MODE_ECP);
|
|
|
|
/* Then, wait for BUSY to get low. */
|
|
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
|
|
printk(KERN_DEBUG PPIP32 "%s: BUSY timeout in %s\n",
|
|
p->name, __func__);
|
|
|
|
stop:
|
|
/* Reset FIFO */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
|
|
|
|
return written;
|
|
}
|
|
|
|
/*
|
|
* FIXME - Insert here parport_ip32_ecp_write_addr().
|
|
*/
|
|
|
|
/*--- Default parport operations ---------------------------------------*/
|
|
|
|
static const struct parport_operations parport_ip32_ops __initconst = {
|
|
.write_data = parport_ip32_write_data,
|
|
.read_data = parport_ip32_read_data,
|
|
|
|
.write_control = parport_ip32_write_control,
|
|
.read_control = parport_ip32_read_control,
|
|
.frob_control = parport_ip32_frob_control,
|
|
|
|
.read_status = parport_ip32_read_status,
|
|
|
|
.enable_irq = parport_ip32_enable_irq,
|
|
.disable_irq = parport_ip32_disable_irq,
|
|
|
|
.data_forward = parport_ip32_data_forward,
|
|
.data_reverse = parport_ip32_data_reverse,
|
|
|
|
.init_state = parport_ip32_init_state,
|
|
.save_state = parport_ip32_save_state,
|
|
.restore_state = parport_ip32_restore_state,
|
|
|
|
.epp_write_data = parport_ieee1284_epp_write_data,
|
|
.epp_read_data = parport_ieee1284_epp_read_data,
|
|
.epp_write_addr = parport_ieee1284_epp_write_addr,
|
|
.epp_read_addr = parport_ieee1284_epp_read_addr,
|
|
|
|
.ecp_write_data = parport_ieee1284_ecp_write_data,
|
|
.ecp_read_data = parport_ieee1284_ecp_read_data,
|
|
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
|
|
|
|
.compat_write_data = parport_ieee1284_write_compat,
|
|
.nibble_read_data = parport_ieee1284_read_nibble,
|
|
.byte_read_data = parport_ieee1284_read_byte,
|
|
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/*--- Device detection -------------------------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_ecp_supported - check for an ECP port
|
|
* @p: pointer to the &parport structure
|
|
*
|
|
* Returns 1 if an ECP port is found, and 0 otherwise. This function actually
|
|
* checks if an Extended Control Register seems to be present. On successful
|
|
* return, the port is placed in SPP mode.
|
|
*/
|
|
static __init unsigned int parport_ip32_ecp_supported(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
unsigned int ecr;
|
|
|
|
ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
|
|
writeb(ecr, priv->regs.ecr);
|
|
if (readb(priv->regs.ecr) != (ecr | ECR_F_EMPTY))
|
|
goto fail;
|
|
|
|
pr_probe(p, "Found working ECR register\n");
|
|
parport_ip32_set_mode(p, ECR_MODE_SPP);
|
|
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
|
|
return 1;
|
|
|
|
fail:
|
|
pr_probe(p, "ECR register not found\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_fifo_supported - check for FIFO parameters
|
|
* @p: pointer to the &parport structure
|
|
*
|
|
* Check for FIFO parameters of an Extended Capabilities Port. Returns 1 on
|
|
* success, and 0 otherwise. Adjust FIFO parameters in the parport structure.
|
|
* On return, the port is placed in SPP mode.
|
|
*/
|
|
static __init unsigned int parport_ip32_fifo_supported(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
unsigned int configa, configb;
|
|
unsigned int pword;
|
|
unsigned int i;
|
|
|
|
/* Configuration mode */
|
|
parport_ip32_set_mode(p, ECR_MODE_CFG);
|
|
configa = readb(priv->regs.cnfgA);
|
|
configb = readb(priv->regs.cnfgB);
|
|
|
|
/* Find out PWord size */
|
|
switch (configa & CNFGA_ID_MASK) {
|
|
case CNFGA_ID_8:
|
|
pword = 1;
|
|
break;
|
|
case CNFGA_ID_16:
|
|
pword = 2;
|
|
break;
|
|
case CNFGA_ID_32:
|
|
pword = 4;
|
|
break;
|
|
default:
|
|
pr_probe(p, "Unknown implementation ID: 0x%0x\n",
|
|
(configa & CNFGA_ID_MASK) >> CNFGA_ID_SHIFT);
|
|
goto fail;
|
|
break;
|
|
}
|
|
if (pword != 1) {
|
|
pr_probe(p, "Unsupported PWord size: %u\n", pword);
|
|
goto fail;
|
|
}
|
|
priv->pword = pword;
|
|
pr_probe(p, "PWord is %u bits\n", 8 * priv->pword);
|
|
|
|
/* Check for compression support */
|
|
writeb(configb | CNFGB_COMPRESS, priv->regs.cnfgB);
|
|
if (readb(priv->regs.cnfgB) & CNFGB_COMPRESS)
|
|
pr_probe(p, "Hardware compression detected (unsupported)\n");
|
|
writeb(configb & ~CNFGB_COMPRESS, priv->regs.cnfgB);
|
|
|
|
/* Reset FIFO and go in test mode (no interrupt, no DMA) */
|
|
parport_ip32_set_mode(p, ECR_MODE_TST);
|
|
|
|
/* FIFO must be empty now */
|
|
if (!(readb(priv->regs.ecr) & ECR_F_EMPTY)) {
|
|
pr_probe(p, "FIFO not reset\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* Find out FIFO depth. */
|
|
priv->fifo_depth = 0;
|
|
for (i = 0; i < 1024; i++) {
|
|
if (readb(priv->regs.ecr) & ECR_F_FULL) {
|
|
/* FIFO full */
|
|
priv->fifo_depth = i;
|
|
break;
|
|
}
|
|
writeb((u8)i, priv->regs.fifo);
|
|
}
|
|
if (i >= 1024) {
|
|
pr_probe(p, "Can't fill FIFO\n");
|
|
goto fail;
|
|
}
|
|
if (!priv->fifo_depth) {
|
|
pr_probe(p, "Can't get FIFO depth\n");
|
|
goto fail;
|
|
}
|
|
pr_probe(p, "FIFO is %u PWords deep\n", priv->fifo_depth);
|
|
|
|
/* Enable interrupts */
|
|
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
|
|
|
|
/* Find out writeIntrThreshold: number of PWords we know we can write
|
|
* if we get an interrupt. */
|
|
priv->writeIntrThreshold = 0;
|
|
for (i = 0; i < priv->fifo_depth; i++) {
|
|
if (readb(priv->regs.fifo) != (u8)i) {
|
|
pr_probe(p, "Invalid data in FIFO\n");
|
|
goto fail;
|
|
}
|
|
if (!priv->writeIntrThreshold
|
|
&& readb(priv->regs.ecr) & ECR_SERVINTR)
|
|
/* writeIntrThreshold reached */
|
|
priv->writeIntrThreshold = i + 1;
|
|
if (i + 1 < priv->fifo_depth
|
|
&& readb(priv->regs.ecr) & ECR_F_EMPTY) {
|
|
/* FIFO empty before the last byte? */
|
|
pr_probe(p, "Data lost in FIFO\n");
|
|
goto fail;
|
|
}
|
|
}
|
|
if (!priv->writeIntrThreshold) {
|
|
pr_probe(p, "Can't get writeIntrThreshold\n");
|
|
goto fail;
|
|
}
|
|
pr_probe(p, "writeIntrThreshold is %u\n", priv->writeIntrThreshold);
|
|
|
|
/* FIFO must be empty now */
|
|
if (!(readb(priv->regs.ecr) & ECR_F_EMPTY)) {
|
|
pr_probe(p, "Can't empty FIFO\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* Reset FIFO */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
/* Set reverse direction (must be in PS2 mode) */
|
|
parport_ip32_data_reverse(p);
|
|
/* Test FIFO, no interrupt, no DMA */
|
|
parport_ip32_set_mode(p, ECR_MODE_TST);
|
|
/* Enable interrupts */
|
|
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
|
|
|
|
/* Find out readIntrThreshold: number of PWords we can read if we get
|
|
* an interrupt. */
|
|
priv->readIntrThreshold = 0;
|
|
for (i = 0; i < priv->fifo_depth; i++) {
|
|
writeb(0xaa, priv->regs.fifo);
|
|
if (readb(priv->regs.ecr) & ECR_SERVINTR) {
|
|
/* readIntrThreshold reached */
|
|
priv->readIntrThreshold = i + 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!priv->readIntrThreshold) {
|
|
pr_probe(p, "Can't get readIntrThreshold\n");
|
|
goto fail;
|
|
}
|
|
pr_probe(p, "readIntrThreshold is %u\n", priv->readIntrThreshold);
|
|
|
|
/* Reset ECR */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_set_mode(p, ECR_MODE_SPP);
|
|
return 1;
|
|
|
|
fail:
|
|
priv->fifo_depth = 0;
|
|
parport_ip32_set_mode(p, ECR_MODE_SPP);
|
|
return 0;
|
|
}
|
|
|
|
/*--- Initialization code ----------------------------------------------*/
|
|
|
|
/**
|
|
* parport_ip32_make_isa_registers - compute (ISA) register addresses
|
|
* @regs: pointer to &struct parport_ip32_regs to fill
|
|
* @base: base address of standard and EPP registers
|
|
* @base_hi: base address of ECP registers
|
|
* @regshift: how much to shift register offset by
|
|
*
|
|
* Compute register addresses, according to the ISA standard. The addresses
|
|
* of the standard and EPP registers are computed from address @base. The
|
|
* addresses of the ECP registers are computed from address @base_hi.
|
|
*/
|
|
static void __init
|
|
parport_ip32_make_isa_registers(struct parport_ip32_regs *regs,
|
|
void __iomem *base, void __iomem *base_hi,
|
|
unsigned int regshift)
|
|
{
|
|
#define r_base(offset) ((u8 __iomem *)base + ((offset) << regshift))
|
|
#define r_base_hi(offset) ((u8 __iomem *)base_hi + ((offset) << regshift))
|
|
*regs = (struct parport_ip32_regs){
|
|
.data = r_base(0),
|
|
.dsr = r_base(1),
|
|
.dcr = r_base(2),
|
|
.eppAddr = r_base(3),
|
|
.eppData0 = r_base(4),
|
|
.eppData1 = r_base(5),
|
|
.eppData2 = r_base(6),
|
|
.eppData3 = r_base(7),
|
|
.ecpAFifo = r_base(0),
|
|
.fifo = r_base_hi(0),
|
|
.cnfgA = r_base_hi(0),
|
|
.cnfgB = r_base_hi(1),
|
|
.ecr = r_base_hi(2)
|
|
};
|
|
#undef r_base_hi
|
|
#undef r_base
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_probe_port - probe and register IP32 built-in parallel port
|
|
*
|
|
* Returns the new allocated &parport structure. On error, an error code is
|
|
* encoded in return value with the ERR_PTR function.
|
|
*/
|
|
static __init struct parport *parport_ip32_probe_port(void)
|
|
{
|
|
struct parport_ip32_regs regs;
|
|
struct parport_ip32_private *priv = NULL;
|
|
struct parport_operations *ops = NULL;
|
|
struct parport *p = NULL;
|
|
int err;
|
|
|
|
parport_ip32_make_isa_registers(®s, &mace->isa.parallel,
|
|
&mace->isa.ecp1284, 8 /* regshift */);
|
|
|
|
ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
|
|
priv = kmalloc(sizeof(struct parport_ip32_private), GFP_KERNEL);
|
|
p = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, ops);
|
|
if (ops == NULL || priv == NULL || p == NULL) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
p->base = MACE_BASE + offsetof(struct sgi_mace, isa.parallel);
|
|
p->base_hi = MACE_BASE + offsetof(struct sgi_mace, isa.ecp1284);
|
|
p->private_data = priv;
|
|
|
|
*ops = parport_ip32_ops;
|
|
*priv = (struct parport_ip32_private){
|
|
.regs = regs,
|
|
.dcr_writable = DCR_DIR | DCR_SELECT | DCR_nINIT |
|
|
DCR_AUTOFD | DCR_STROBE,
|
|
.irq_mode = PARPORT_IP32_IRQ_FWD,
|
|
};
|
|
init_completion(&priv->irq_complete);
|
|
|
|
/* Probe port. */
|
|
if (!parport_ip32_ecp_supported(p)) {
|
|
err = -ENODEV;
|
|
goto fail;
|
|
}
|
|
parport_ip32_dump_state(p, "begin init", 0);
|
|
|
|
/* We found what looks like a working ECR register. Simply assume
|
|
* that all modes are correctly supported. Enable basic modes. */
|
|
p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
|
|
p->modes |= PARPORT_MODE_TRISTATE;
|
|
|
|
if (!parport_ip32_fifo_supported(p)) {
|
|
pr_warn(PPIP32 "%s: error: FIFO disabled\n", p->name);
|
|
/* Disable hardware modes depending on a working FIFO. */
|
|
features &= ~PARPORT_IP32_ENABLE_SPP;
|
|
features &= ~PARPORT_IP32_ENABLE_ECP;
|
|
/* DMA is not needed if FIFO is not supported. */
|
|
features &= ~PARPORT_IP32_ENABLE_DMA;
|
|
}
|
|
|
|
/* Request IRQ */
|
|
if (features & PARPORT_IP32_ENABLE_IRQ) {
|
|
int irq = MACEISA_PARALLEL_IRQ;
|
|
if (request_irq(irq, parport_ip32_interrupt, 0, p->name, p)) {
|
|
pr_warn(PPIP32 "%s: error: IRQ disabled\n", p->name);
|
|
/* DMA cannot work without interrupts. */
|
|
features &= ~PARPORT_IP32_ENABLE_DMA;
|
|
} else {
|
|
pr_probe(p, "Interrupt support enabled\n");
|
|
p->irq = irq;
|
|
priv->dcr_writable |= DCR_IRQ;
|
|
}
|
|
}
|
|
|
|
/* Allocate DMA resources */
|
|
if (features & PARPORT_IP32_ENABLE_DMA) {
|
|
if (parport_ip32_dma_register())
|
|
pr_warn(PPIP32 "%s: error: DMA disabled\n", p->name);
|
|
else {
|
|
pr_probe(p, "DMA support enabled\n");
|
|
p->dma = 0; /* arbitrary value != PARPORT_DMA_NONE */
|
|
p->modes |= PARPORT_MODE_DMA;
|
|
}
|
|
}
|
|
|
|
if (features & PARPORT_IP32_ENABLE_SPP) {
|
|
/* Enable compatibility FIFO mode */
|
|
p->ops->compat_write_data = parport_ip32_compat_write_data;
|
|
p->modes |= PARPORT_MODE_COMPAT;
|
|
pr_probe(p, "Hardware support for SPP mode enabled\n");
|
|
}
|
|
if (features & PARPORT_IP32_ENABLE_EPP) {
|
|
/* Set up access functions to use EPP hardware. */
|
|
p->ops->epp_read_data = parport_ip32_epp_read_data;
|
|
p->ops->epp_write_data = parport_ip32_epp_write_data;
|
|
p->ops->epp_read_addr = parport_ip32_epp_read_addr;
|
|
p->ops->epp_write_addr = parport_ip32_epp_write_addr;
|
|
p->modes |= PARPORT_MODE_EPP;
|
|
pr_probe(p, "Hardware support for EPP mode enabled\n");
|
|
}
|
|
if (features & PARPORT_IP32_ENABLE_ECP) {
|
|
/* Enable ECP FIFO mode */
|
|
p->ops->ecp_write_data = parport_ip32_ecp_write_data;
|
|
/* FIXME - not implemented */
|
|
/* p->ops->ecp_read_data = parport_ip32_ecp_read_data; */
|
|
/* p->ops->ecp_write_addr = parport_ip32_ecp_write_addr; */
|
|
p->modes |= PARPORT_MODE_ECP;
|
|
pr_probe(p, "Hardware support for ECP mode enabled\n");
|
|
}
|
|
|
|
/* Initialize the port with sensible values */
|
|
parport_ip32_set_mode(p, ECR_MODE_PS2);
|
|
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
|
|
parport_ip32_data_forward(p);
|
|
parport_ip32_disable_irq(p);
|
|
parport_ip32_write_data(p, 0x00);
|
|
parport_ip32_dump_state(p, "end init", 0);
|
|
|
|
/* Print out what we found */
|
|
pr_info("%s: SGI IP32 at 0x%lx (0x%lx)", p->name, p->base, p->base_hi);
|
|
if (p->irq != PARPORT_IRQ_NONE)
|
|
pr_cont(", irq %d", p->irq);
|
|
pr_cont(" [");
|
|
#define printmode(x) \
|
|
do { \
|
|
if (p->modes & PARPORT_MODE_##x) \
|
|
pr_cont("%s%s", f++ ? "," : "", #x); \
|
|
} while (0)
|
|
{
|
|
unsigned int f = 0;
|
|
printmode(PCSPP);
|
|
printmode(TRISTATE);
|
|
printmode(COMPAT);
|
|
printmode(EPP);
|
|
printmode(ECP);
|
|
printmode(DMA);
|
|
}
|
|
#undef printmode
|
|
pr_cont("]\n");
|
|
|
|
parport_announce_port(p);
|
|
return p;
|
|
|
|
fail:
|
|
if (p)
|
|
parport_put_port(p);
|
|
kfree(priv);
|
|
kfree(ops);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_unregister_port - unregister a parallel port
|
|
* @p: pointer to the &struct parport
|
|
*
|
|
* Unregisters a parallel port and free previously allocated resources
|
|
* (memory, IRQ, ...).
|
|
*/
|
|
static __exit void parport_ip32_unregister_port(struct parport *p)
|
|
{
|
|
struct parport_ip32_private * const priv = p->physport->private_data;
|
|
struct parport_operations *ops = p->ops;
|
|
|
|
parport_remove_port(p);
|
|
if (p->modes & PARPORT_MODE_DMA)
|
|
parport_ip32_dma_unregister();
|
|
if (p->irq != PARPORT_IRQ_NONE)
|
|
free_irq(p->irq, p);
|
|
parport_put_port(p);
|
|
kfree(priv);
|
|
kfree(ops);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_init - module initialization function
|
|
*/
|
|
static int __init parport_ip32_init(void)
|
|
{
|
|
pr_info(PPIP32 "SGI IP32 built-in parallel port driver v0.6\n");
|
|
this_port = parport_ip32_probe_port();
|
|
return PTR_ERR_OR_ZERO(this_port);
|
|
}
|
|
|
|
/**
|
|
* parport_ip32_exit - module termination function
|
|
*/
|
|
static void __exit parport_ip32_exit(void)
|
|
{
|
|
parport_ip32_unregister_port(this_port);
|
|
}
|
|
|
|
/*--- Module stuff -----------------------------------------------------*/
|
|
|
|
MODULE_AUTHOR("Arnaud Giersch <arnaud.giersch@free.fr>");
|
|
MODULE_DESCRIPTION("SGI IP32 built-in parallel port driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION("0.6"); /* update in parport_ip32_init() too */
|
|
|
|
module_init(parport_ip32_init);
|
|
module_exit(parport_ip32_exit);
|
|
|
|
module_param(verbose_probing, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(verbose_probing, "Log chit-chat during initialization");
|
|
|
|
module_param(features, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(features,
|
|
"Bit mask of features to enable"
|
|
", bit 0: IRQ support"
|
|
", bit 1: DMA support"
|
|
", bit 2: hardware SPP mode"
|
|
", bit 3: hardware EPP mode"
|
|
", bit 4: hardware ECP mode");
|
|
|
|
/*--- Inform (X)Emacs about preferred coding style ---------------------*/
|
|
/*
|
|
* Local Variables:
|
|
* mode: c
|
|
* c-file-style: "linux"
|
|
* indent-tabs-mode: t
|
|
* tab-width: 8
|
|
* fill-column: 78
|
|
* ispell-local-dictionary: "american"
|
|
* End:
|
|
*/
|