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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
477 lines
12 KiB
C
477 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* c67x00-ll-hpi.c: Cypress C67X00 USB Low level interface using HPI
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*
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* Copyright (C) 2006-2008 Barco N.V.
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* Derived from the Cypress cy7c67200/300 ezusb linux driver and
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* based on multiple host controller drivers inside the linux kernel.
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*/
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#include <asm/byteorder.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/usb/c67x00.h>
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#include "c67x00.h"
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#define COMM_REGS 14
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struct c67x00_lcp_int_data {
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u16 regs[COMM_REGS];
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};
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/* -------------------------------------------------------------------------- */
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/* Interface definitions */
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#define COMM_ACK 0x0FED
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#define COMM_NAK 0xDEAD
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#define COMM_RESET 0xFA50
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#define COMM_EXEC_INT 0xCE01
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#define COMM_INT_NUM 0x01C2
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/* Registers 0 to COMM_REGS-1 */
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#define COMM_R(x) (0x01C4 + 2 * (x))
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#define HUSB_SIE_pCurrentTDPtr(x) ((x) ? 0x01B2 : 0x01B0)
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#define HUSB_SIE_pTDListDone_Sem(x) ((x) ? 0x01B8 : 0x01B6)
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#define HUSB_pEOT 0x01B4
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/* Software interrupts */
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/* 114, 115: */
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#define HUSB_SIE_INIT_INT(x) ((x) ? 0x0073 : 0x0072)
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#define HUSB_RESET_INT 0x0074
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#define SUSB_INIT_INT 0x0071
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#define SUSB_INIT_INT_LOC (SUSB_INIT_INT * 2)
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/* -----------------------------------------------------------------------
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* HPI implementation
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*
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* The c67x00 chip also support control via SPI or HSS serial
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* interfaces. However, this driver assumes that register access can
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* be performed from IRQ context. While this is a safe assumption with
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* the HPI interface, it is not true for the serial interfaces.
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*/
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/* HPI registers */
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#define HPI_DATA 0
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#define HPI_MAILBOX 1
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#define HPI_ADDR 2
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#define HPI_STATUS 3
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/*
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* According to CY7C67300 specification (tables 140 and 141) HPI read and
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* write cycle duration Tcyc must be at least 6T long, where T is 1/48MHz,
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* which is 125ns.
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*/
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#define HPI_T_CYC_NS 125
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static inline u16 hpi_read_reg(struct c67x00_device *dev, int reg)
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{
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ndelay(HPI_T_CYC_NS);
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return __raw_readw(dev->hpi.base + reg * dev->hpi.regstep);
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}
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static inline void hpi_write_reg(struct c67x00_device *dev, int reg, u16 value)
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{
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ndelay(HPI_T_CYC_NS);
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__raw_writew(value, dev->hpi.base + reg * dev->hpi.regstep);
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}
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static inline u16 hpi_read_word_nolock(struct c67x00_device *dev, u16 reg)
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{
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hpi_write_reg(dev, HPI_ADDR, reg);
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return hpi_read_reg(dev, HPI_DATA);
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}
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static u16 hpi_read_word(struct c67x00_device *dev, u16 reg)
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{
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u16 value;
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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value = hpi_read_word_nolock(dev, reg);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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return value;
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}
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static void hpi_write_word_nolock(struct c67x00_device *dev, u16 reg, u16 value)
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{
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hpi_write_reg(dev, HPI_ADDR, reg);
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hpi_write_reg(dev, HPI_DATA, value);
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}
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static void hpi_write_word(struct c67x00_device *dev, u16 reg, u16 value)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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hpi_write_word_nolock(dev, reg, value);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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}
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/*
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* Only data is little endian, addr has cpu endianess
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*/
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static void hpi_write_words_le16(struct c67x00_device *dev, u16 addr,
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__le16 *data, u16 count)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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hpi_write_reg(dev, HPI_ADDR, addr);
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for (i = 0; i < count; i++)
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hpi_write_reg(dev, HPI_DATA, le16_to_cpu(*data++));
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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}
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/*
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* Only data is little endian, addr has cpu endianess
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*/
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static void hpi_read_words_le16(struct c67x00_device *dev, u16 addr,
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__le16 *data, u16 count)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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hpi_write_reg(dev, HPI_ADDR, addr);
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for (i = 0; i < count; i++)
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*data++ = cpu_to_le16(hpi_read_reg(dev, HPI_DATA));
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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}
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static void hpi_set_bits(struct c67x00_device *dev, u16 reg, u16 mask)
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{
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u16 value;
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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value = hpi_read_word_nolock(dev, reg);
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hpi_write_word_nolock(dev, reg, value | mask);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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}
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static void hpi_clear_bits(struct c67x00_device *dev, u16 reg, u16 mask)
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{
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u16 value;
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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value = hpi_read_word_nolock(dev, reg);
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hpi_write_word_nolock(dev, reg, value & ~mask);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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}
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static u16 hpi_recv_mbox(struct c67x00_device *dev)
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{
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u16 value;
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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value = hpi_read_reg(dev, HPI_MAILBOX);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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return value;
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}
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static u16 hpi_send_mbox(struct c67x00_device *dev, u16 value)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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hpi_write_reg(dev, HPI_MAILBOX, value);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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return value;
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}
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u16 c67x00_ll_hpi_status(struct c67x00_device *dev)
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{
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u16 value;
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unsigned long flags;
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spin_lock_irqsave(&dev->hpi.lock, flags);
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value = hpi_read_reg(dev, HPI_STATUS);
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spin_unlock_irqrestore(&dev->hpi.lock, flags);
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return value;
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}
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void c67x00_ll_hpi_reg_init(struct c67x00_device *dev)
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{
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int i;
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hpi_recv_mbox(dev);
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c67x00_ll_hpi_status(dev);
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hpi_write_word(dev, HPI_IRQ_ROUTING_REG, 0);
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for (i = 0; i < C67X00_SIES; i++) {
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hpi_write_word(dev, SIEMSG_REG(i), 0);
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hpi_read_word(dev, SIEMSG_REG(i));
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}
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}
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void c67x00_ll_hpi_enable_sofeop(struct c67x00_sie *sie)
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{
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hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
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SOFEOP_TO_HPI_EN(sie->sie_num));
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}
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void c67x00_ll_hpi_disable_sofeop(struct c67x00_sie *sie)
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{
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hpi_clear_bits(sie->dev, HPI_IRQ_ROUTING_REG,
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SOFEOP_TO_HPI_EN(sie->sie_num));
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}
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/* -------------------------------------------------------------------------- */
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/* Transactions */
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static inline int ll_recv_msg(struct c67x00_device *dev)
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{
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u16 res;
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res = wait_for_completion_timeout(&dev->hpi.lcp.msg_received, 5 * HZ);
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WARN_ON(!res);
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return (res == 0) ? -EIO : 0;
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}
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/* -------------------------------------------------------------------------- */
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/* General functions */
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u16 c67x00_ll_fetch_siemsg(struct c67x00_device *dev, int sie_num)
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{
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u16 val;
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val = hpi_read_word(dev, SIEMSG_REG(sie_num));
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/* clear register to allow next message */
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hpi_write_word(dev, SIEMSG_REG(sie_num), 0);
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return val;
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}
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u16 c67x00_ll_get_usb_ctl(struct c67x00_sie *sie)
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{
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return hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num));
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}
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/**
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* c67x00_ll_usb_clear_status - clear the USB status bits
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*/
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void c67x00_ll_usb_clear_status(struct c67x00_sie *sie, u16 bits)
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{
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hpi_write_word(sie->dev, USB_STAT_REG(sie->sie_num), bits);
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}
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u16 c67x00_ll_usb_get_status(struct c67x00_sie *sie)
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{
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return hpi_read_word(sie->dev, USB_STAT_REG(sie->sie_num));
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}
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/* -------------------------------------------------------------------------- */
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static int c67x00_comm_exec_int(struct c67x00_device *dev, u16 nr,
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struct c67x00_lcp_int_data *data)
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{
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int i, rc;
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mutex_lock(&dev->hpi.lcp.mutex);
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hpi_write_word(dev, COMM_INT_NUM, nr);
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for (i = 0; i < COMM_REGS; i++)
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hpi_write_word(dev, COMM_R(i), data->regs[i]);
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hpi_send_mbox(dev, COMM_EXEC_INT);
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rc = ll_recv_msg(dev);
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mutex_unlock(&dev->hpi.lcp.mutex);
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return rc;
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}
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/* -------------------------------------------------------------------------- */
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/* Host specific functions */
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void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
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{
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mutex_lock(&dev->hpi.lcp.mutex);
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hpi_write_word(dev, HUSB_pEOT, value);
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mutex_unlock(&dev->hpi.lcp.mutex);
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}
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static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
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{
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struct c67x00_device *dev = sie->dev;
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struct c67x00_lcp_int_data data;
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int rc;
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rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
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BUG_ON(rc); /* No return path for error code; crash spectacularly */
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}
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void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
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{
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struct c67x00_device *dev = sie->dev;
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struct c67x00_lcp_int_data data;
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int rc;
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data.regs[0] = 50; /* Reset USB port for 50ms */
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data.regs[1] = port | (sie->sie_num << 1);
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rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
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BUG_ON(rc); /* No return path for error code; crash spectacularly */
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}
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void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
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{
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hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
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}
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u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
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{
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return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
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}
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u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
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{
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return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
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}
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void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
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{
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/* Set port into host mode */
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hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
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c67x00_ll_husb_sie_init(sie);
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/* Clear interrupts */
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c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
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/* Check */
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if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
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dev_warn(sie_dev(sie),
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"SIE %d not set to host mode\n", sie->sie_num);
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}
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void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
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{
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/* Clear connect change */
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c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
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/* Enable interrupts */
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hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
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SOFEOP_TO_CPU_EN(sie->sie_num));
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hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
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SOF_EOP_IRQ_EN | DONE_IRQ_EN);
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/* Enable pull down transistors */
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hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
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}
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/* -------------------------------------------------------------------------- */
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void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
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{
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if ((int_status & MBX_OUT_FLG) == 0)
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return;
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dev->hpi.lcp.last_msg = hpi_recv_mbox(dev);
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complete(&dev->hpi.lcp.msg_received);
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}
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/* -------------------------------------------------------------------------- */
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int c67x00_ll_reset(struct c67x00_device *dev)
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{
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int rc;
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mutex_lock(&dev->hpi.lcp.mutex);
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hpi_send_mbox(dev, COMM_RESET);
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rc = ll_recv_msg(dev);
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mutex_unlock(&dev->hpi.lcp.mutex);
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return rc;
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}
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/* -------------------------------------------------------------------------- */
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/**
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* c67x00_ll_write_mem_le16 - write into c67x00 memory
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* Only data is little endian, addr has cpu endianess.
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*/
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void c67x00_ll_write_mem_le16(struct c67x00_device *dev, u16 addr,
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void *data, int len)
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{
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u8 *buf = data;
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/* Sanity check */
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if (addr + len > 0xffff) {
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dev_err(&dev->pdev->dev,
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"Trying to write beyond writable region!\n");
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return;
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}
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if (addr & 0x01) {
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/* unaligned access */
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u16 tmp;
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tmp = hpi_read_word(dev, addr - 1);
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tmp = (tmp & 0x00ff) | (*buf++ << 8);
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hpi_write_word(dev, addr - 1, tmp);
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addr++;
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len--;
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}
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hpi_write_words_le16(dev, addr, (__le16 *)buf, len / 2);
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buf += len & ~0x01;
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addr += len & ~0x01;
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len &= 0x01;
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if (len) {
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u16 tmp;
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tmp = hpi_read_word(dev, addr);
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tmp = (tmp & 0xff00) | *buf;
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hpi_write_word(dev, addr, tmp);
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}
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}
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/**
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* c67x00_ll_read_mem_le16 - read from c67x00 memory
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* Only data is little endian, addr has cpu endianess.
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*/
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void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
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void *data, int len)
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{
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u8 *buf = data;
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if (addr & 0x01) {
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/* unaligned access */
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u16 tmp;
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tmp = hpi_read_word(dev, addr - 1);
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*buf++ = (tmp >> 8) & 0x00ff;
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addr++;
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len--;
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}
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hpi_read_words_le16(dev, addr, (__le16 *)buf, len / 2);
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buf += len & ~0x01;
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addr += len & ~0x01;
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len &= 0x01;
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if (len) {
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u16 tmp;
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tmp = hpi_read_word(dev, addr);
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*buf = tmp & 0x00ff;
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}
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}
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/* -------------------------------------------------------------------------- */
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void c67x00_ll_init(struct c67x00_device *dev)
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{
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mutex_init(&dev->hpi.lcp.mutex);
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init_completion(&dev->hpi.lcp.msg_received);
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}
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void c67x00_ll_release(struct c67x00_device *dev)
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{
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}
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