linux/sound/pci/oxygen/oxygen_io.c
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   1/*
   2 * C-Media CMI8788 driver - helper functions
   3 *
   4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5 *
   6 *
   7 *  This driver is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License, version 2.
   9 *
  10 *  This driver is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *  GNU General Public License for more details.
  14 *
  15 *  You should have received a copy of the GNU General Public License
  16 *  along with this driver; if not, write to the Free Software
  17 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 */
  19
  20#include <linux/delay.h>
  21#include <linux/sched.h>
  22#include <sound/core.h>
  23#include <sound/mpu401.h>
  24#include <asm/io.h>
  25#include "oxygen.h"
  26
  27u8 oxygen_read8(struct oxygen *chip, unsigned int reg)
  28{
  29        return inb(chip->addr + reg);
  30}
  31EXPORT_SYMBOL(oxygen_read8);
  32
  33u16 oxygen_read16(struct oxygen *chip, unsigned int reg)
  34{
  35        return inw(chip->addr + reg);
  36}
  37EXPORT_SYMBOL(oxygen_read16);
  38
  39u32 oxygen_read32(struct oxygen *chip, unsigned int reg)
  40{
  41        return inl(chip->addr + reg);
  42}
  43EXPORT_SYMBOL(oxygen_read32);
  44
  45void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value)
  46{
  47        outb(value, chip->addr + reg);
  48        chip->saved_registers._8[reg] = value;
  49}
  50EXPORT_SYMBOL(oxygen_write8);
  51
  52void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value)
  53{
  54        outw(value, chip->addr + reg);
  55        chip->saved_registers._16[reg / 2] = cpu_to_le16(value);
  56}
  57EXPORT_SYMBOL(oxygen_write16);
  58
  59void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value)
  60{
  61        outl(value, chip->addr + reg);
  62        chip->saved_registers._32[reg / 4] = cpu_to_le32(value);
  63}
  64EXPORT_SYMBOL(oxygen_write32);
  65
  66void oxygen_write8_masked(struct oxygen *chip, unsigned int reg,
  67                          u8 value, u8 mask)
  68{
  69        u8 tmp = inb(chip->addr + reg);
  70        tmp &= ~mask;
  71        tmp |= value & mask;
  72        outb(tmp, chip->addr + reg);
  73        chip->saved_registers._8[reg] = tmp;
  74}
  75EXPORT_SYMBOL(oxygen_write8_masked);
  76
  77void oxygen_write16_masked(struct oxygen *chip, unsigned int reg,
  78                           u16 value, u16 mask)
  79{
  80        u16 tmp = inw(chip->addr + reg);
  81        tmp &= ~mask;
  82        tmp |= value & mask;
  83        outw(tmp, chip->addr + reg);
  84        chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp);
  85}
  86EXPORT_SYMBOL(oxygen_write16_masked);
  87
  88void oxygen_write32_masked(struct oxygen *chip, unsigned int reg,
  89                           u32 value, u32 mask)
  90{
  91        u32 tmp = inl(chip->addr + reg);
  92        tmp &= ~mask;
  93        tmp |= value & mask;
  94        outl(tmp, chip->addr + reg);
  95        chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp);
  96}
  97EXPORT_SYMBOL(oxygen_write32_masked);
  98
  99static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
 100{
 101        u8 status = 0;
 102
 103        /*
 104         * Reading the status register also clears the bits, so we have to save
 105         * the read bits in status.
 106         */
 107        wait_event_timeout(chip->ac97_waitqueue,
 108                           ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
 109                              status & mask; }),
 110                           msecs_to_jiffies(1) + 1);
 111        /*
 112         * Check even after a timeout because this function should not require
 113         * the AC'97 interrupt to be enabled.
 114         */
 115        status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
 116        return status & mask ? 0 : -EIO;
 117}
 118
 119/*
 120 * About 10% of AC'97 register reads or writes fail to complete, but even those
 121 * where the controller indicates completion aren't guaranteed to have actually
 122 * happened.
 123 *
 124 * It's hard to assign blame to either the controller or the codec because both
 125 * were made by C-Media ...
 126 */
 127
 128void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,
 129                       unsigned int index, u16 data)
 130{
 131        unsigned int count, succeeded;
 132        u32 reg;
 133
 134        reg = data;
 135        reg |= index << OXYGEN_AC97_REG_ADDR_SHIFT;
 136        reg |= OXYGEN_AC97_REG_DIR_WRITE;
 137        reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
 138        succeeded = 0;
 139        for (count = 5; count > 0; --count) {
 140                udelay(5);
 141                oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
 142                /* require two "completed" writes, just to be sure */
 143                if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 &&
 144                    ++succeeded >= 2) {
 145                        chip->saved_ac97_registers[codec][index / 2] = data;
 146                        return;
 147                }
 148        }
 149        snd_printk(KERN_ERR "AC'97 write timeout\n");
 150}
 151EXPORT_SYMBOL(oxygen_write_ac97);
 152
 153u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec,
 154                     unsigned int index)
 155{
 156        unsigned int count;
 157        unsigned int last_read = UINT_MAX;
 158        u32 reg;
 159
 160        reg = index << OXYGEN_AC97_REG_ADDR_SHIFT;
 161        reg |= OXYGEN_AC97_REG_DIR_READ;
 162        reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
 163        for (count = 5; count > 0; --count) {
 164                udelay(5);
 165                oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
 166                udelay(10);
 167                if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) {
 168                        u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS);
 169                        /* we require two consecutive reads of the same value */
 170                        if (value == last_read)
 171                                return value;
 172                        last_read = value;
 173                        /*
 174                         * Invert the register value bits to make sure that two
 175                         * consecutive unsuccessful reads do not return the same
 176                         * value.
 177                         */
 178                        reg ^= 0xffff;
 179                }
 180        }
 181        snd_printk(KERN_ERR "AC'97 read timeout on codec %u\n", codec);
 182        return 0;
 183}
 184EXPORT_SYMBOL(oxygen_read_ac97);
 185
 186void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
 187                              unsigned int index, u16 data, u16 mask)
 188{
 189        u16 value = oxygen_read_ac97(chip, codec, index);
 190        value &= ~mask;
 191        value |= data & mask;
 192        oxygen_write_ac97(chip, codec, index, value);
 193}
 194EXPORT_SYMBOL(oxygen_write_ac97_masked);
 195
 196void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
 197{
 198        unsigned int count;
 199
 200        /* should not need more than 30.72 us (24 * 1.28 us) */
 201        count = 10;
 202        while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
 203               && count > 0) {
 204                udelay(4);
 205                --count;
 206        }
 207
 208        oxygen_write8(chip, OXYGEN_SPI_DATA1, data);
 209        oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);
 210        if (control & OXYGEN_SPI_DATA_LENGTH_3)
 211                oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);
 212        oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);
 213}
 214EXPORT_SYMBOL(oxygen_write_spi);
 215
 216void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
 217{
 218        /* should not need more than about 300 us */
 219        msleep(1);
 220
 221        oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
 222        oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);
 223        oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,
 224                      device | OXYGEN_2WIRE_DIR_WRITE);
 225}
 226EXPORT_SYMBOL(oxygen_write_i2c);
 227
 228static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
 229{
 230        if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
 231                msleep(1);
 232        oxygen_write8(chip, OXYGEN_MPU401 + port, data);
 233}
 234
 235void oxygen_reset_uart(struct oxygen *chip)
 236{
 237        _write_uart(chip, 1, MPU401_RESET);
 238        msleep(1); /* wait for ACK */
 239        _write_uart(chip, 1, MPU401_ENTER_UART);
 240}
 241EXPORT_SYMBOL(oxygen_reset_uart);
 242
 243void oxygen_write_uart(struct oxygen *chip, u8 data)
 244{
 245        _write_uart(chip, 0, data);
 246}
 247EXPORT_SYMBOL(oxygen_write_uart);
 248
 249u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index)
 250{
 251        unsigned int timeout;
 252
 253        oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
 254                      index | OXYGEN_EEPROM_DIR_READ);
 255        for (timeout = 0; timeout < 100; ++timeout) {
 256                udelay(1);
 257                if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
 258                      & OXYGEN_EEPROM_BUSY))
 259                        break;
 260        }
 261        return oxygen_read16(chip, OXYGEN_EEPROM_DATA);
 262}
 263
 264void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value)
 265{
 266        unsigned int timeout;
 267
 268        oxygen_write16(chip, OXYGEN_EEPROM_DATA, value);
 269        oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
 270                      index | OXYGEN_EEPROM_DIR_WRITE);
 271        for (timeout = 0; timeout < 10; ++timeout) {
 272                msleep(1);
 273                if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
 274                      & OXYGEN_EEPROM_BUSY))
 275                        return;
 276        }
 277        snd_printk(KERN_ERR "EEPROM write timeout\n");
 278}
 279