cdad5b8db9
After sending a reset command to the UART, wait some time for the ACK to be generated (and to be read and dropped by the interrupt handler) before sending the next command. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
256 lines
6.9 KiB
C
256 lines
6.9 KiB
C
/*
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* C-Media CMI8788 driver - helper functions
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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*
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*
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* This driver is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2.
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*
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* This driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this driver; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <sound/core.h>
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#include <sound/mpu401.h>
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#include <asm/io.h>
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#include "oxygen.h"
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u8 oxygen_read8(struct oxygen *chip, unsigned int reg)
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{
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return inb(chip->addr + reg);
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}
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EXPORT_SYMBOL(oxygen_read8);
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u16 oxygen_read16(struct oxygen *chip, unsigned int reg)
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{
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return inw(chip->addr + reg);
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}
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EXPORT_SYMBOL(oxygen_read16);
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u32 oxygen_read32(struct oxygen *chip, unsigned int reg)
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{
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return inl(chip->addr + reg);
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}
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EXPORT_SYMBOL(oxygen_read32);
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void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value)
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{
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outb(value, chip->addr + reg);
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chip->saved_registers._8[reg] = value;
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}
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EXPORT_SYMBOL(oxygen_write8);
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void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value)
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{
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outw(value, chip->addr + reg);
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chip->saved_registers._16[reg / 2] = cpu_to_le16(value);
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}
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EXPORT_SYMBOL(oxygen_write16);
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void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value)
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{
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outl(value, chip->addr + reg);
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chip->saved_registers._32[reg / 4] = cpu_to_le32(value);
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}
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EXPORT_SYMBOL(oxygen_write32);
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void oxygen_write8_masked(struct oxygen *chip, unsigned int reg,
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u8 value, u8 mask)
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{
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u8 tmp = inb(chip->addr + reg);
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tmp &= ~mask;
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tmp |= value & mask;
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outb(tmp, chip->addr + reg);
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chip->saved_registers._8[reg] = tmp;
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}
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EXPORT_SYMBOL(oxygen_write8_masked);
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void oxygen_write16_masked(struct oxygen *chip, unsigned int reg,
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u16 value, u16 mask)
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{
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u16 tmp = inw(chip->addr + reg);
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tmp &= ~mask;
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tmp |= value & mask;
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outw(tmp, chip->addr + reg);
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chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp);
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}
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EXPORT_SYMBOL(oxygen_write16_masked);
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void oxygen_write32_masked(struct oxygen *chip, unsigned int reg,
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u32 value, u32 mask)
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{
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u32 tmp = inl(chip->addr + reg);
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tmp &= ~mask;
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tmp |= value & mask;
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outl(tmp, chip->addr + reg);
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chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp);
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}
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EXPORT_SYMBOL(oxygen_write32_masked);
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static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
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{
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u8 status = 0;
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/*
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* Reading the status register also clears the bits, so we have to save
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* the read bits in status.
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*/
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wait_event_timeout(chip->ac97_waitqueue,
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({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
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status & mask; }),
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msecs_to_jiffies(1) + 1);
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/*
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* Check even after a timeout because this function should not require
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* the AC'97 interrupt to be enabled.
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*/
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status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
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return status & mask ? 0 : -EIO;
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}
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/*
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* About 10% of AC'97 register reads or writes fail to complete, but even those
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* where the controller indicates completion aren't guaranteed to have actually
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* happened.
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*
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* It's hard to assign blame to either the controller or the codec because both
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* were made by C-Media ...
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*/
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void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,
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unsigned int index, u16 data)
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{
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unsigned int count, succeeded;
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u32 reg;
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reg = data;
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reg |= index << OXYGEN_AC97_REG_ADDR_SHIFT;
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reg |= OXYGEN_AC97_REG_DIR_WRITE;
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reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
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succeeded = 0;
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for (count = 5; count > 0; --count) {
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udelay(5);
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oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
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/* require two "completed" writes, just to be sure */
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if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 &&
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++succeeded >= 2) {
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chip->saved_ac97_registers[codec][index / 2] = data;
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return;
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}
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}
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snd_printk(KERN_ERR "AC'97 write timeout\n");
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}
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EXPORT_SYMBOL(oxygen_write_ac97);
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u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec,
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unsigned int index)
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{
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unsigned int count;
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unsigned int last_read = UINT_MAX;
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u32 reg;
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reg = index << OXYGEN_AC97_REG_ADDR_SHIFT;
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reg |= OXYGEN_AC97_REG_DIR_READ;
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reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
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for (count = 5; count > 0; --count) {
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udelay(5);
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oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
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udelay(10);
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if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) {
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u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS);
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/* we require two consecutive reads of the same value */
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if (value == last_read)
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return value;
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last_read = value;
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/*
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* Invert the register value bits to make sure that two
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* consecutive unsuccessful reads do not return the same
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* value.
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*/
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reg ^= 0xffff;
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}
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}
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snd_printk(KERN_ERR "AC'97 read timeout on codec %u\n", codec);
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return 0;
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}
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EXPORT_SYMBOL(oxygen_read_ac97);
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void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
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unsigned int index, u16 data, u16 mask)
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{
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u16 value = oxygen_read_ac97(chip, codec, index);
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value &= ~mask;
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value |= data & mask;
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oxygen_write_ac97(chip, codec, index, value);
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}
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EXPORT_SYMBOL(oxygen_write_ac97_masked);
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void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
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{
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unsigned int count;
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/* should not need more than 7.68 us (24 * 320 ns) */
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count = 10;
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while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
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&& count > 0) {
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udelay(1);
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--count;
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}
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oxygen_write8(chip, OXYGEN_SPI_DATA1, data);
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oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);
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if (control & OXYGEN_SPI_DATA_LENGTH_3)
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oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);
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oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);
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}
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EXPORT_SYMBOL(oxygen_write_spi);
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void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
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{
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unsigned long timeout;
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/* should not need more than about 300 us */
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timeout = jiffies + msecs_to_jiffies(1);
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do {
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if (!(oxygen_read16(chip, OXYGEN_2WIRE_BUS_STATUS)
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& OXYGEN_2WIRE_BUSY))
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break;
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udelay(1);
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cond_resched();
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} while (time_after_eq(timeout, jiffies));
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oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
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oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);
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oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,
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device | OXYGEN_2WIRE_DIR_WRITE);
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}
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EXPORT_SYMBOL(oxygen_write_i2c);
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static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
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{
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if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
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msleep(1);
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oxygen_write8(chip, OXYGEN_MPU401 + port, data);
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}
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void oxygen_reset_uart(struct oxygen *chip)
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{
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_write_uart(chip, 1, MPU401_RESET);
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msleep(1); /* wait for ACK */
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_write_uart(chip, 1, MPU401_ENTER_UART);
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}
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EXPORT_SYMBOL(oxygen_reset_uart);
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void oxygen_write_uart(struct oxygen *chip, u8 data)
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{
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_write_uart(chip, 0, data);
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}
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EXPORT_SYMBOL(oxygen_write_uart);
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