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- /*
- * C-Media CMI8788 driver - helper functions
- *
- * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
- *
- *
- * This driver is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2.
- *
- * This driver is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this driver; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <linux/delay.h>
- #include <linux/sched.h>
- #include <linux/export.h>
- #include <linux/io.h>
- #include <sound/core.h>
- #include <sound/mpu401.h>
- #include "oxygen.h"
- u8 oxygen_read8(struct oxygen *chip, unsigned int reg)
- {
- return inb(chip->addr + reg);
- }
- EXPORT_SYMBOL(oxygen_read8);
- u16 oxygen_read16(struct oxygen *chip, unsigned int reg)
- {
- return inw(chip->addr + reg);
- }
- EXPORT_SYMBOL(oxygen_read16);
- u32 oxygen_read32(struct oxygen *chip, unsigned int reg)
- {
- return inl(chip->addr + reg);
- }
- EXPORT_SYMBOL(oxygen_read32);
- void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value)
- {
- outb(value, chip->addr + reg);
- chip->saved_registers._8[reg] = value;
- }
- EXPORT_SYMBOL(oxygen_write8);
- void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value)
- {
- outw(value, chip->addr + reg);
- chip->saved_registers._16[reg / 2] = cpu_to_le16(value);
- }
- EXPORT_SYMBOL(oxygen_write16);
- void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value)
- {
- outl(value, chip->addr + reg);
- chip->saved_registers._32[reg / 4] = cpu_to_le32(value);
- }
- EXPORT_SYMBOL(oxygen_write32);
- void oxygen_write8_masked(struct oxygen *chip, unsigned int reg,
- u8 value, u8 mask)
- {
- u8 tmp = inb(chip->addr + reg);
- tmp &= ~mask;
- tmp |= value & mask;
- outb(tmp, chip->addr + reg);
- chip->saved_registers._8[reg] = tmp;
- }
- EXPORT_SYMBOL(oxygen_write8_masked);
- void oxygen_write16_masked(struct oxygen *chip, unsigned int reg,
- u16 value, u16 mask)
- {
- u16 tmp = inw(chip->addr + reg);
- tmp &= ~mask;
- tmp |= value & mask;
- outw(tmp, chip->addr + reg);
- chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp);
- }
- EXPORT_SYMBOL(oxygen_write16_masked);
- void oxygen_write32_masked(struct oxygen *chip, unsigned int reg,
- u32 value, u32 mask)
- {
- u32 tmp = inl(chip->addr + reg);
- tmp &= ~mask;
- tmp |= value & mask;
- outl(tmp, chip->addr + reg);
- chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp);
- }
- EXPORT_SYMBOL(oxygen_write32_masked);
- static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
- {
- u8 status = 0;
- /*
- * Reading the status register also clears the bits, so we have to save
- * the read bits in status.
- */
- wait_event_timeout(chip->ac97_waitqueue,
- ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
- status & mask; }),
- msecs_to_jiffies(1) + 1);
- /*
- * Check even after a timeout because this function should not require
- * the AC'97 interrupt to be enabled.
- */
- status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
- return status & mask ? 0 : -EIO;
- }
- /*
- * About 10% of AC'97 register reads or writes fail to complete, but even those
- * where the controller indicates completion aren't guaranteed to have actually
- * happened.
- *
- * It's hard to assign blame to either the controller or the codec because both
- * were made by C-Media ...
- */
- void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,
- unsigned int index, u16 data)
- {
- unsigned int count, succeeded;
- u32 reg;
- reg = data;
- reg |= index << OXYGEN_AC97_REG_ADDR_SHIFT;
- reg |= OXYGEN_AC97_REG_DIR_WRITE;
- reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
- succeeded = 0;
- for (count = 5; count > 0; --count) {
- udelay(5);
- oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
- /* require two "completed" writes, just to be sure */
- if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 &&
- ++succeeded >= 2) {
- chip->saved_ac97_registers[codec][index / 2] = data;
- return;
- }
- }
- dev_err(chip->card->dev, "AC'97 write timeout\n");
- }
- EXPORT_SYMBOL(oxygen_write_ac97);
- u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec,
- unsigned int index)
- {
- unsigned int count;
- unsigned int last_read = UINT_MAX;
- u32 reg;
- reg = index << OXYGEN_AC97_REG_ADDR_SHIFT;
- reg |= OXYGEN_AC97_REG_DIR_READ;
- reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
- for (count = 5; count > 0; --count) {
- udelay(5);
- oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
- udelay(10);
- if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) {
- u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS);
- /* we require two consecutive reads of the same value */
- if (value == last_read)
- return value;
- last_read = value;
- /*
- * Invert the register value bits to make sure that two
- * consecutive unsuccessful reads do not return the same
- * value.
- */
- reg ^= 0xffff;
- }
- }
- dev_err(chip->card->dev, "AC'97 read timeout on codec %u\n", codec);
- return 0;
- }
- EXPORT_SYMBOL(oxygen_read_ac97);
- void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
- unsigned int index, u16 data, u16 mask)
- {
- u16 value = oxygen_read_ac97(chip, codec, index);
- value &= ~mask;
- value |= data & mask;
- oxygen_write_ac97(chip, codec, index, value);
- }
- EXPORT_SYMBOL(oxygen_write_ac97_masked);
- static int oxygen_wait_spi(struct oxygen *chip)
- {
- unsigned int count;
- /*
- * Higher timeout to be sure: 200 us;
- * actual transaction should not need more than 40 us.
- */
- for (count = 50; count > 0; count--) {
- udelay(4);
- if ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) &
- OXYGEN_SPI_BUSY) == 0)
- return 0;
- }
- dev_err(chip->card->dev, "oxygen: SPI wait timeout\n");
- return -EIO;
- }
- int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
- {
- /*
- * We need to wait AFTER initiating the SPI transaction,
- * otherwise read operations will not work.
- */
- oxygen_write8(chip, OXYGEN_SPI_DATA1, data);
- oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);
- if (control & OXYGEN_SPI_DATA_LENGTH_3)
- oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);
- oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);
- return oxygen_wait_spi(chip);
- }
- EXPORT_SYMBOL(oxygen_write_spi);
- void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
- {
- /* should not need more than about 300 us */
- msleep(1);
- oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
- oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);
- oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,
- device | OXYGEN_2WIRE_DIR_WRITE);
- }
- EXPORT_SYMBOL(oxygen_write_i2c);
- static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
- {
- if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
- msleep(1);
- oxygen_write8(chip, OXYGEN_MPU401 + port, data);
- }
- void oxygen_reset_uart(struct oxygen *chip)
- {
- _write_uart(chip, 1, MPU401_RESET);
- msleep(1); /* wait for ACK */
- _write_uart(chip, 1, MPU401_ENTER_UART);
- }
- EXPORT_SYMBOL(oxygen_reset_uart);
- void oxygen_write_uart(struct oxygen *chip, u8 data)
- {
- _write_uart(chip, 0, data);
- }
- EXPORT_SYMBOL(oxygen_write_uart);
- u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index)
- {
- unsigned int timeout;
- oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
- index | OXYGEN_EEPROM_DIR_READ);
- for (timeout = 0; timeout < 100; ++timeout) {
- udelay(1);
- if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
- & OXYGEN_EEPROM_BUSY))
- break;
- }
- return oxygen_read16(chip, OXYGEN_EEPROM_DATA);
- }
- void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value)
- {
- unsigned int timeout;
- oxygen_write16(chip, OXYGEN_EEPROM_DATA, value);
- oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
- index | OXYGEN_EEPROM_DIR_WRITE);
- for (timeout = 0; timeout < 10; ++timeout) {
- msleep(1);
- if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
- & OXYGEN_EEPROM_BUSY))
- return;
- }
- dev_err(chip->card->dev, "EEPROM write timeout\n");
- }
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