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![Jovi Zhang](/assets/img/avatar_default.png)
remove invalid location line in each file header after location moved from driver/char to driver/tty Signed-off-by: Jovi Zhang <bookjovi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
974 lines
24 KiB
C
974 lines
24 KiB
C
/*
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* Support for the asynchronous serial interface (DUART) included
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* in the BCM1250 and derived System-On-a-Chip (SOC) devices.
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*
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* Copyright (c) 2007 Maciej W. Rozycki
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*
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* Derived from drivers/char/sb1250_duart.c for which the following
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* copyright applies:
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*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* References:
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*
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* "BCM1250/BCM1125/BCM1125H User Manual", Broadcom Corporation
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*/
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#if defined(CONFIG_SERIAL_SB1250_DUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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#include <linux/compiler.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/spinlock.h>
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#include <linux/sysrq.h>
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#include <linux/tty.h>
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#include <linux/types.h>
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#include <asm/atomic.h>
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#include <asm/io.h>
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#include <asm/war.h>
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#include <asm/sibyte/sb1250.h>
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#include <asm/sibyte/sb1250_uart.h>
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#include <asm/sibyte/swarm.h>
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#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
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#include <asm/sibyte/bcm1480_regs.h>
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#include <asm/sibyte/bcm1480_int.h>
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#define SBD_CHANREGS(line) A_BCM1480_DUART_CHANREG((line), 0)
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#define SBD_CTRLREGS(line) A_BCM1480_DUART_CTRLREG((line), 0)
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#define SBD_INT(line) (K_BCM1480_INT_UART_0 + (line))
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#define DUART_CHANREG_SPACING BCM1480_DUART_CHANREG_SPACING
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#define R_DUART_IMRREG(line) R_BCM1480_DUART_IMRREG(line)
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#define R_DUART_INCHREG(line) R_BCM1480_DUART_INCHREG(line)
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#define R_DUART_ISRREG(line) R_BCM1480_DUART_ISRREG(line)
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#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
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#include <asm/sibyte/sb1250_regs.h>
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#include <asm/sibyte/sb1250_int.h>
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#define SBD_CHANREGS(line) A_DUART_CHANREG((line), 0)
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#define SBD_CTRLREGS(line) A_DUART_CTRLREG(0)
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#define SBD_INT(line) (K_INT_UART_0 + (line))
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#else
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#error invalid SB1250 UART configuration
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#endif
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MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
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MODULE_DESCRIPTION("BCM1xxx on-chip DUART serial driver");
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MODULE_LICENSE("GPL");
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#define DUART_MAX_CHIP 2
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#define DUART_MAX_SIDE 2
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/*
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* Per-port state.
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*/
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struct sbd_port {
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struct sbd_duart *duart;
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struct uart_port port;
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unsigned char __iomem *memctrl;
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int tx_stopped;
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int initialised;
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};
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/*
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* Per-DUART state for the shared register space.
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*/
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struct sbd_duart {
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struct sbd_port sport[2];
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unsigned long mapctrl;
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atomic_t map_guard;
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};
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#define to_sport(uport) container_of(uport, struct sbd_port, port)
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static struct sbd_duart sbd_duarts[DUART_MAX_CHIP];
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/*
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* Reading and writing SB1250 DUART registers.
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*
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* There are three register spaces: two per-channel ones and
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* a shared one. We have to define accessors appropriately.
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* All registers are 64-bit and all but the Baud Rate Clock
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* registers only define 8 least significant bits. There is
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* also a workaround to take into account. Raw accessors use
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* the full register width, but cooked ones truncate it
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* intentionally so that the rest of the driver does not care.
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*/
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static u64 __read_sbdchn(struct sbd_port *sport, int reg)
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{
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void __iomem *csr = sport->port.membase + reg;
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return __raw_readq(csr);
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}
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static u64 __read_sbdshr(struct sbd_port *sport, int reg)
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{
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void __iomem *csr = sport->memctrl + reg;
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return __raw_readq(csr);
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}
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static void __write_sbdchn(struct sbd_port *sport, int reg, u64 value)
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{
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void __iomem *csr = sport->port.membase + reg;
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__raw_writeq(value, csr);
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}
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static void __write_sbdshr(struct sbd_port *sport, int reg, u64 value)
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{
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void __iomem *csr = sport->memctrl + reg;
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__raw_writeq(value, csr);
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}
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/*
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* In bug 1956, we get glitches that can mess up uart registers. This
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* "read-mode-reg after any register access" is an accepted workaround.
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*/
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static void __war_sbd1956(struct sbd_port *sport)
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{
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__read_sbdchn(sport, R_DUART_MODE_REG_1);
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__read_sbdchn(sport, R_DUART_MODE_REG_2);
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}
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static unsigned char read_sbdchn(struct sbd_port *sport, int reg)
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{
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unsigned char retval;
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retval = __read_sbdchn(sport, reg);
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if (SIBYTE_1956_WAR)
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__war_sbd1956(sport);
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return retval;
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}
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static unsigned char read_sbdshr(struct sbd_port *sport, int reg)
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{
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unsigned char retval;
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retval = __read_sbdshr(sport, reg);
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if (SIBYTE_1956_WAR)
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__war_sbd1956(sport);
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return retval;
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}
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static void write_sbdchn(struct sbd_port *sport, int reg, unsigned int value)
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{
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__write_sbdchn(sport, reg, value);
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if (SIBYTE_1956_WAR)
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__war_sbd1956(sport);
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}
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static void write_sbdshr(struct sbd_port *sport, int reg, unsigned int value)
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{
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__write_sbdshr(sport, reg, value);
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if (SIBYTE_1956_WAR)
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__war_sbd1956(sport);
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}
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static int sbd_receive_ready(struct sbd_port *sport)
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{
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return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_RX_RDY;
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}
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static int sbd_receive_drain(struct sbd_port *sport)
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{
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int loops = 10000;
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while (sbd_receive_ready(sport) && --loops)
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read_sbdchn(sport, R_DUART_RX_HOLD);
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return loops;
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}
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static int __maybe_unused sbd_transmit_ready(struct sbd_port *sport)
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{
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return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_RDY;
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}
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static int __maybe_unused sbd_transmit_drain(struct sbd_port *sport)
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{
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int loops = 10000;
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while (!sbd_transmit_ready(sport) && --loops)
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udelay(2);
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return loops;
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}
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static int sbd_transmit_empty(struct sbd_port *sport)
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{
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return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_EMT;
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}
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static int sbd_line_drain(struct sbd_port *sport)
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{
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int loops = 10000;
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while (!sbd_transmit_empty(sport) && --loops)
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udelay(2);
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return loops;
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}
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static unsigned int sbd_tx_empty(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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return sbd_transmit_empty(sport) ? TIOCSER_TEMT : 0;
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}
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static unsigned int sbd_get_mctrl(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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unsigned int mctrl, status;
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status = read_sbdshr(sport, R_DUART_IN_PORT);
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status >>= (uport->line) % 2;
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mctrl = (!(status & M_DUART_IN_PIN0_VAL) ? TIOCM_CTS : 0) |
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(!(status & M_DUART_IN_PIN4_VAL) ? TIOCM_CAR : 0) |
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(!(status & M_DUART_RIN0_PIN) ? TIOCM_RNG : 0) |
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(!(status & M_DUART_IN_PIN2_VAL) ? TIOCM_DSR : 0);
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return mctrl;
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}
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static void sbd_set_mctrl(struct uart_port *uport, unsigned int mctrl)
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{
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struct sbd_port *sport = to_sport(uport);
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unsigned int clr = 0, set = 0, mode2;
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if (mctrl & TIOCM_DTR)
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set |= M_DUART_SET_OPR2;
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else
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clr |= M_DUART_CLR_OPR2;
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if (mctrl & TIOCM_RTS)
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set |= M_DUART_SET_OPR0;
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else
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clr |= M_DUART_CLR_OPR0;
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clr <<= (uport->line) % 2;
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set <<= (uport->line) % 2;
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mode2 = read_sbdchn(sport, R_DUART_MODE_REG_2);
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mode2 &= ~M_DUART_CHAN_MODE;
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if (mctrl & TIOCM_LOOP)
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mode2 |= V_DUART_CHAN_MODE_LCL_LOOP;
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else
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mode2 |= V_DUART_CHAN_MODE_NORMAL;
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write_sbdshr(sport, R_DUART_CLEAR_OPR, clr);
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write_sbdshr(sport, R_DUART_SET_OPR, set);
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write_sbdchn(sport, R_DUART_MODE_REG_2, mode2);
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}
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static void sbd_stop_tx(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
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sport->tx_stopped = 1;
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};
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static void sbd_start_tx(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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unsigned int mask;
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/* Enable tx interrupts. */
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mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
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mask |= M_DUART_IMR_TX;
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write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
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/* Go!, go!, go!... */
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write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
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sport->tx_stopped = 0;
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};
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static void sbd_stop_rx(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
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};
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static void sbd_enable_ms(struct uart_port *uport)
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{
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struct sbd_port *sport = to_sport(uport);
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write_sbdchn(sport, R_DUART_AUXCTL_X,
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M_DUART_CIN_CHNG_ENA | M_DUART_CTS_CHNG_ENA);
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}
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static void sbd_break_ctl(struct uart_port *uport, int break_state)
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{
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struct sbd_port *sport = to_sport(uport);
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if (break_state == -1)
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write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_START_BREAK);
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else
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write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_STOP_BREAK);
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}
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static void sbd_receive_chars(struct sbd_port *sport)
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{
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struct uart_port *uport = &sport->port;
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struct uart_icount *icount;
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unsigned int status, ch, flag;
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int count;
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for (count = 16; count; count--) {
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status = read_sbdchn(sport, R_DUART_STATUS);
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if (!(status & M_DUART_RX_RDY))
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break;
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ch = read_sbdchn(sport, R_DUART_RX_HOLD);
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flag = TTY_NORMAL;
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icount = &uport->icount;
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icount->rx++;
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if (unlikely(status &
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(M_DUART_RCVD_BRK | M_DUART_FRM_ERR |
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M_DUART_PARITY_ERR | M_DUART_OVRUN_ERR))) {
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if (status & M_DUART_RCVD_BRK) {
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icount->brk++;
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if (uart_handle_break(uport))
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continue;
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} else if (status & M_DUART_FRM_ERR)
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icount->frame++;
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else if (status & M_DUART_PARITY_ERR)
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icount->parity++;
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if (status & M_DUART_OVRUN_ERR)
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icount->overrun++;
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status &= uport->read_status_mask;
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if (status & M_DUART_RCVD_BRK)
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flag = TTY_BREAK;
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else if (status & M_DUART_FRM_ERR)
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flag = TTY_FRAME;
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else if (status & M_DUART_PARITY_ERR)
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flag = TTY_PARITY;
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}
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if (uart_handle_sysrq_char(uport, ch))
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continue;
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uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
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}
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tty_flip_buffer_push(uport->state->port.tty);
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}
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static void sbd_transmit_chars(struct sbd_port *sport)
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{
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struct uart_port *uport = &sport->port;
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struct circ_buf *xmit = &sport->port.state->xmit;
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unsigned int mask;
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int stop_tx;
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/* XON/XOFF chars. */
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if (sport->port.x_char) {
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write_sbdchn(sport, R_DUART_TX_HOLD, sport->port.x_char);
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sport->port.icount.tx++;
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sport->port.x_char = 0;
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return;
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}
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/* If nothing to do or stopped or hardware stopped. */
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stop_tx = (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port));
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/* Send char. */
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if (!stop_tx) {
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write_sbdchn(sport, R_DUART_TX_HOLD, xmit->buf[xmit->tail]);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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sport->port.icount.tx++;
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&sport->port);
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}
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/* Are we are done? */
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if (stop_tx || uart_circ_empty(xmit)) {
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/* Disable tx interrupts. */
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mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
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mask &= ~M_DUART_IMR_TX;
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write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
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}
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}
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static void sbd_status_handle(struct sbd_port *sport)
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{
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struct uart_port *uport = &sport->port;
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unsigned int delta;
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delta = read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
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delta >>= (uport->line) % 2;
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if (delta & (M_DUART_IN_PIN0_VAL << S_DUART_IN_PIN_CHNG))
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uart_handle_cts_change(uport, !(delta & M_DUART_IN_PIN0_VAL));
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if (delta & (M_DUART_IN_PIN2_VAL << S_DUART_IN_PIN_CHNG))
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uport->icount.dsr++;
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if (delta & ((M_DUART_IN_PIN2_VAL | M_DUART_IN_PIN0_VAL) <<
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S_DUART_IN_PIN_CHNG))
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wake_up_interruptible(&uport->state->port.delta_msr_wait);
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}
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static irqreturn_t sbd_interrupt(int irq, void *dev_id)
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{
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struct sbd_port *sport = dev_id;
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struct uart_port *uport = &sport->port;
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irqreturn_t status = IRQ_NONE;
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unsigned int intstat;
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int count;
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for (count = 16; count; count--) {
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intstat = read_sbdshr(sport,
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R_DUART_ISRREG((uport->line) % 2));
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intstat &= read_sbdshr(sport,
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R_DUART_IMRREG((uport->line) % 2));
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intstat &= M_DUART_ISR_ALL;
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if (!intstat)
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break;
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if (intstat & M_DUART_ISR_RX)
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sbd_receive_chars(sport);
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if (intstat & M_DUART_ISR_IN)
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sbd_status_handle(sport);
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if (intstat & M_DUART_ISR_TX)
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sbd_transmit_chars(sport);
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status = IRQ_HANDLED;
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}
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return status;
|
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}
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|
|
static int sbd_startup(struct uart_port *uport)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
unsigned int mode1;
|
|
int ret;
|
|
|
|
ret = request_irq(sport->port.irq, sbd_interrupt,
|
|
IRQF_SHARED, "sb1250-duart", sport);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Clear the receive FIFO. */
|
|
sbd_receive_drain(sport);
|
|
|
|
/* Clear the interrupt registers. */
|
|
write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT);
|
|
read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
|
|
|
|
/* Set rx/tx interrupt to FIFO available. */
|
|
mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
|
|
mode1 &= ~(M_DUART_RX_IRQ_SEL_RXFULL | M_DUART_TX_IRQ_SEL_TXEMPT);
|
|
write_sbdchn(sport, R_DUART_MODE_REG_1, mode1);
|
|
|
|
/* Disable tx, enable rx. */
|
|
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_EN);
|
|
sport->tx_stopped = 1;
|
|
|
|
/* Enable interrupts. */
|
|
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
|
|
M_DUART_IMR_IN | M_DUART_IMR_RX);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sbd_shutdown(struct uart_port *uport)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
|
|
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
|
|
sport->tx_stopped = 1;
|
|
free_irq(sport->port.irq, sport);
|
|
}
|
|
|
|
|
|
static void sbd_init_port(struct sbd_port *sport)
|
|
{
|
|
struct uart_port *uport = &sport->port;
|
|
|
|
if (sport->initialised)
|
|
return;
|
|
|
|
/* There is no DUART reset feature, so just set some sane defaults. */
|
|
write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_TX);
|
|
write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_RX);
|
|
write_sbdchn(sport, R_DUART_MODE_REG_1, V_DUART_BITS_PER_CHAR_8);
|
|
write_sbdchn(sport, R_DUART_MODE_REG_2, 0);
|
|
write_sbdchn(sport, R_DUART_FULL_CTL,
|
|
V_DUART_INT_TIME(0) | V_DUART_SIG_FULL(15));
|
|
write_sbdchn(sport, R_DUART_OPCR_X, 0);
|
|
write_sbdchn(sport, R_DUART_AUXCTL_X, 0);
|
|
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
|
|
|
|
sport->initialised = 1;
|
|
}
|
|
|
|
static void sbd_set_termios(struct uart_port *uport, struct ktermios *termios,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
unsigned int mode1 = 0, mode2 = 0, aux = 0;
|
|
unsigned int mode1mask = 0, mode2mask = 0, auxmask = 0;
|
|
unsigned int oldmode1, oldmode2, oldaux;
|
|
unsigned int baud, brg;
|
|
unsigned int command;
|
|
|
|
mode1mask |= ~(M_DUART_PARITY_MODE | M_DUART_PARITY_TYPE_ODD |
|
|
M_DUART_BITS_PER_CHAR);
|
|
mode2mask |= ~M_DUART_STOP_BIT_LEN_2;
|
|
auxmask |= ~M_DUART_CTS_CHNG_ENA;
|
|
|
|
/* Byte size. */
|
|
switch (termios->c_cflag & CSIZE) {
|
|
case CS5:
|
|
case CS6:
|
|
/* Unsupported, leave unchanged. */
|
|
mode1mask |= M_DUART_PARITY_MODE;
|
|
break;
|
|
case CS7:
|
|
mode1 |= V_DUART_BITS_PER_CHAR_7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
mode1 |= V_DUART_BITS_PER_CHAR_8;
|
|
break;
|
|
}
|
|
|
|
/* Parity and stop bits. */
|
|
if (termios->c_cflag & CSTOPB)
|
|
mode2 |= M_DUART_STOP_BIT_LEN_2;
|
|
else
|
|
mode2 |= M_DUART_STOP_BIT_LEN_1;
|
|
if (termios->c_cflag & PARENB)
|
|
mode1 |= V_DUART_PARITY_MODE_ADD;
|
|
else
|
|
mode1 |= V_DUART_PARITY_MODE_NONE;
|
|
if (termios->c_cflag & PARODD)
|
|
mode1 |= M_DUART_PARITY_TYPE_ODD;
|
|
else
|
|
mode1 |= M_DUART_PARITY_TYPE_EVEN;
|
|
|
|
baud = uart_get_baud_rate(uport, termios, old_termios, 1200, 5000000);
|
|
brg = V_DUART_BAUD_RATE(baud);
|
|
/* The actual lower bound is 1221bps, so compensate. */
|
|
if (brg > M_DUART_CLK_COUNTER)
|
|
brg = M_DUART_CLK_COUNTER;
|
|
|
|
uart_update_timeout(uport, termios->c_cflag, baud);
|
|
|
|
uport->read_status_mask = M_DUART_OVRUN_ERR;
|
|
if (termios->c_iflag & INPCK)
|
|
uport->read_status_mask |= M_DUART_FRM_ERR |
|
|
M_DUART_PARITY_ERR;
|
|
if (termios->c_iflag & (BRKINT | PARMRK))
|
|
uport->read_status_mask |= M_DUART_RCVD_BRK;
|
|
|
|
uport->ignore_status_mask = 0;
|
|
if (termios->c_iflag & IGNPAR)
|
|
uport->ignore_status_mask |= M_DUART_FRM_ERR |
|
|
M_DUART_PARITY_ERR;
|
|
if (termios->c_iflag & IGNBRK) {
|
|
uport->ignore_status_mask |= M_DUART_RCVD_BRK;
|
|
if (termios->c_iflag & IGNPAR)
|
|
uport->ignore_status_mask |= M_DUART_OVRUN_ERR;
|
|
}
|
|
|
|
if (termios->c_cflag & CREAD)
|
|
command = M_DUART_RX_EN;
|
|
else
|
|
command = M_DUART_RX_DIS;
|
|
|
|
if (termios->c_cflag & CRTSCTS)
|
|
aux |= M_DUART_CTS_CHNG_ENA;
|
|
else
|
|
aux &= ~M_DUART_CTS_CHNG_ENA;
|
|
|
|
spin_lock(&uport->lock);
|
|
|
|
if (sport->tx_stopped)
|
|
command |= M_DUART_TX_DIS;
|
|
else
|
|
command |= M_DUART_TX_EN;
|
|
|
|
oldmode1 = read_sbdchn(sport, R_DUART_MODE_REG_1) & mode1mask;
|
|
oldmode2 = read_sbdchn(sport, R_DUART_MODE_REG_2) & mode2mask;
|
|
oldaux = read_sbdchn(sport, R_DUART_AUXCTL_X) & auxmask;
|
|
|
|
if (!sport->tx_stopped)
|
|
sbd_line_drain(sport);
|
|
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
|
|
|
|
write_sbdchn(sport, R_DUART_MODE_REG_1, mode1 | oldmode1);
|
|
write_sbdchn(sport, R_DUART_MODE_REG_2, mode2 | oldmode2);
|
|
write_sbdchn(sport, R_DUART_CLK_SEL, brg);
|
|
write_sbdchn(sport, R_DUART_AUXCTL_X, aux | oldaux);
|
|
|
|
write_sbdchn(sport, R_DUART_CMD, command);
|
|
|
|
spin_unlock(&uport->lock);
|
|
}
|
|
|
|
|
|
static const char *sbd_type(struct uart_port *uport)
|
|
{
|
|
return "SB1250 DUART";
|
|
}
|
|
|
|
static void sbd_release_port(struct uart_port *uport)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
struct sbd_duart *duart = sport->duart;
|
|
int map_guard;
|
|
|
|
iounmap(sport->memctrl);
|
|
sport->memctrl = NULL;
|
|
iounmap(uport->membase);
|
|
uport->membase = NULL;
|
|
|
|
map_guard = atomic_add_return(-1, &duart->map_guard);
|
|
if (!map_guard)
|
|
release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING);
|
|
release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
|
|
}
|
|
|
|
static int sbd_map_port(struct uart_port *uport)
|
|
{
|
|
const char *err = KERN_ERR "sbd: Cannot map MMIO\n";
|
|
struct sbd_port *sport = to_sport(uport);
|
|
struct sbd_duart *duart = sport->duart;
|
|
|
|
if (!uport->membase)
|
|
uport->membase = ioremap_nocache(uport->mapbase,
|
|
DUART_CHANREG_SPACING);
|
|
if (!uport->membase) {
|
|
printk(err);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!sport->memctrl)
|
|
sport->memctrl = ioremap_nocache(duart->mapctrl,
|
|
DUART_CHANREG_SPACING);
|
|
if (!sport->memctrl) {
|
|
printk(err);
|
|
iounmap(uport->membase);
|
|
uport->membase = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbd_request_port(struct uart_port *uport)
|
|
{
|
|
const char *err = KERN_ERR "sbd: Unable to reserve MMIO resource\n";
|
|
struct sbd_duart *duart = to_sport(uport)->duart;
|
|
int map_guard;
|
|
int ret = 0;
|
|
|
|
if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING,
|
|
"sb1250-duart")) {
|
|
printk(err);
|
|
return -EBUSY;
|
|
}
|
|
map_guard = atomic_add_return(1, &duart->map_guard);
|
|
if (map_guard == 1) {
|
|
if (!request_mem_region(duart->mapctrl, DUART_CHANREG_SPACING,
|
|
"sb1250-duart")) {
|
|
atomic_add(-1, &duart->map_guard);
|
|
printk(err);
|
|
ret = -EBUSY;
|
|
}
|
|
}
|
|
if (!ret) {
|
|
ret = sbd_map_port(uport);
|
|
if (ret) {
|
|
map_guard = atomic_add_return(-1, &duart->map_guard);
|
|
if (!map_guard)
|
|
release_mem_region(duart->mapctrl,
|
|
DUART_CHANREG_SPACING);
|
|
}
|
|
}
|
|
if (ret) {
|
|
release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void sbd_config_port(struct uart_port *uport, int flags)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
|
|
if (flags & UART_CONFIG_TYPE) {
|
|
if (sbd_request_port(uport))
|
|
return;
|
|
|
|
uport->type = PORT_SB1250_DUART;
|
|
|
|
sbd_init_port(sport);
|
|
}
|
|
}
|
|
|
|
static int sbd_verify_port(struct uart_port *uport, struct serial_struct *ser)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (ser->type != PORT_UNKNOWN && ser->type != PORT_SB1250_DUART)
|
|
ret = -EINVAL;
|
|
if (ser->irq != uport->irq)
|
|
ret = -EINVAL;
|
|
if (ser->baud_base != uport->uartclk / 16)
|
|
ret = -EINVAL;
|
|
return ret;
|
|
}
|
|
|
|
|
|
static const struct uart_ops sbd_ops = {
|
|
.tx_empty = sbd_tx_empty,
|
|
.set_mctrl = sbd_set_mctrl,
|
|
.get_mctrl = sbd_get_mctrl,
|
|
.stop_tx = sbd_stop_tx,
|
|
.start_tx = sbd_start_tx,
|
|
.stop_rx = sbd_stop_rx,
|
|
.enable_ms = sbd_enable_ms,
|
|
.break_ctl = sbd_break_ctl,
|
|
.startup = sbd_startup,
|
|
.shutdown = sbd_shutdown,
|
|
.set_termios = sbd_set_termios,
|
|
.type = sbd_type,
|
|
.release_port = sbd_release_port,
|
|
.request_port = sbd_request_port,
|
|
.config_port = sbd_config_port,
|
|
.verify_port = sbd_verify_port,
|
|
};
|
|
|
|
/* Initialize SB1250 DUART port structures. */
|
|
static void __init sbd_probe_duarts(void)
|
|
{
|
|
static int probed;
|
|
int chip, side;
|
|
int max_lines, line;
|
|
|
|
if (probed)
|
|
return;
|
|
|
|
/* Set the number of available units based on the SOC type. */
|
|
switch (soc_type) {
|
|
case K_SYS_SOC_TYPE_BCM1x55:
|
|
case K_SYS_SOC_TYPE_BCM1x80:
|
|
max_lines = 4;
|
|
break;
|
|
default:
|
|
/* Assume at least two serial ports at the normal address. */
|
|
max_lines = 2;
|
|
break;
|
|
}
|
|
|
|
probed = 1;
|
|
|
|
for (chip = 0, line = 0; chip < DUART_MAX_CHIP && line < max_lines;
|
|
chip++) {
|
|
sbd_duarts[chip].mapctrl = SBD_CTRLREGS(line);
|
|
|
|
for (side = 0; side < DUART_MAX_SIDE && line < max_lines;
|
|
side++, line++) {
|
|
struct sbd_port *sport = &sbd_duarts[chip].sport[side];
|
|
struct uart_port *uport = &sport->port;
|
|
|
|
sport->duart = &sbd_duarts[chip];
|
|
|
|
uport->irq = SBD_INT(line);
|
|
uport->uartclk = 100000000 / 20 * 16;
|
|
uport->fifosize = 16;
|
|
uport->iotype = UPIO_MEM;
|
|
uport->flags = UPF_BOOT_AUTOCONF;
|
|
uport->ops = &sbd_ops;
|
|
uport->line = line;
|
|
uport->mapbase = SBD_CHANREGS(line);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SERIAL_SB1250_DUART_CONSOLE
|
|
/*
|
|
* Serial console stuff. Very basic, polling driver for doing serial
|
|
* console output. The console_lock is held by the caller, so we
|
|
* shouldn't be interrupted for more console activity.
|
|
*/
|
|
static void sbd_console_putchar(struct uart_port *uport, int ch)
|
|
{
|
|
struct sbd_port *sport = to_sport(uport);
|
|
|
|
sbd_transmit_drain(sport);
|
|
write_sbdchn(sport, R_DUART_TX_HOLD, ch);
|
|
}
|
|
|
|
static void sbd_console_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
int chip = co->index / DUART_MAX_SIDE;
|
|
int side = co->index % DUART_MAX_SIDE;
|
|
struct sbd_port *sport = &sbd_duarts[chip].sport[side];
|
|
struct uart_port *uport = &sport->port;
|
|
unsigned long flags;
|
|
unsigned int mask;
|
|
|
|
/* Disable transmit interrupts and enable the transmitter. */
|
|
spin_lock_irqsave(&uport->lock, flags);
|
|
mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
|
|
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
|
|
mask & ~M_DUART_IMR_TX);
|
|
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
|
|
spin_unlock_irqrestore(&uport->lock, flags);
|
|
|
|
uart_console_write(&sport->port, s, count, sbd_console_putchar);
|
|
|
|
/* Restore transmit interrupts and the transmitter enable. */
|
|
spin_lock_irqsave(&uport->lock, flags);
|
|
sbd_line_drain(sport);
|
|
if (sport->tx_stopped)
|
|
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
|
|
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
|
|
spin_unlock_irqrestore(&uport->lock, flags);
|
|
}
|
|
|
|
static int __init sbd_console_setup(struct console *co, char *options)
|
|
{
|
|
int chip = co->index / DUART_MAX_SIDE;
|
|
int side = co->index % DUART_MAX_SIDE;
|
|
struct sbd_port *sport = &sbd_duarts[chip].sport[side];
|
|
struct uart_port *uport = &sport->port;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
int ret;
|
|
|
|
if (!sport->duart)
|
|
return -ENXIO;
|
|
|
|
ret = sbd_map_port(uport);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sbd_init_port(sport);
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
return uart_set_options(uport, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver sbd_reg;
|
|
static struct console sbd_console = {
|
|
.name = "duart",
|
|
.write = sbd_console_write,
|
|
.device = uart_console_device,
|
|
.setup = sbd_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &sbd_reg
|
|
};
|
|
|
|
static int __init sbd_serial_console_init(void)
|
|
{
|
|
sbd_probe_duarts();
|
|
register_console(&sbd_console);
|
|
|
|
return 0;
|
|
}
|
|
|
|
console_initcall(sbd_serial_console_init);
|
|
|
|
#define SERIAL_SB1250_DUART_CONSOLE &sbd_console
|
|
#else
|
|
#define SERIAL_SB1250_DUART_CONSOLE NULL
|
|
#endif /* CONFIG_SERIAL_SB1250_DUART_CONSOLE */
|
|
|
|
|
|
static struct uart_driver sbd_reg = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "sb1250_duart",
|
|
.dev_name = "duart",
|
|
.major = TTY_MAJOR,
|
|
.minor = SB1250_DUART_MINOR_BASE,
|
|
.nr = DUART_MAX_CHIP * DUART_MAX_SIDE,
|
|
.cons = SERIAL_SB1250_DUART_CONSOLE,
|
|
};
|
|
|
|
/* Set up the driver and register it. */
|
|
static int __init sbd_init(void)
|
|
{
|
|
int i, ret;
|
|
|
|
sbd_probe_duarts();
|
|
|
|
ret = uart_register_driver(&sbd_reg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < DUART_MAX_CHIP * DUART_MAX_SIDE; i++) {
|
|
struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
|
|
struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
|
|
struct uart_port *uport = &sport->port;
|
|
|
|
if (sport->duart)
|
|
uart_add_one_port(&sbd_reg, uport);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Unload the driver. Unregister stuff, get ready to go away. */
|
|
static void __exit sbd_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = DUART_MAX_CHIP * DUART_MAX_SIDE - 1; i >= 0; i--) {
|
|
struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
|
|
struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
|
|
struct uart_port *uport = &sport->port;
|
|
|
|
if (sport->duart)
|
|
uart_remove_one_port(&sbd_reg, uport);
|
|
}
|
|
|
|
uart_unregister_driver(&sbd_reg);
|
|
}
|
|
|
|
module_init(sbd_init);
|
|
module_exit(sbd_exit);
|