git.oblomov.eu Git - linux-2.6/blob - sound/pci/oxygen/oxygen_io.c

   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
  27 u8 oxygen_read8(struct oxygen *chip, unsigned int reg)
  28 {
  29         return inb(chip->addr + reg);
  30 }
  31 EXPORT_SYMBOL(oxygen_read8);
  32
  33 u16 oxygen_read16(struct oxygen *chip, unsigned int reg)
  34 {
  35         return inw(chip->addr + reg);
  36 }
  37 EXPORT_SYMBOL(oxygen_read16);
  38
  39 u32 oxygen_read32(struct oxygen *chip, unsigned int reg)
  40 {
  41         return inl(chip->addr + reg);
  42 }
  43 EXPORT_SYMBOL(oxygen_read32);
  44
  45 void 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 }
  50 EXPORT_SYMBOL(oxygen_write8);
  51
  52 void 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 }
  57 EXPORT_SYMBOL(oxygen_write16);
  58
  59 void 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 }
  64 EXPORT_SYMBOL(oxygen_write32);
  65
  66 void 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 }
  75 EXPORT_SYMBOL(oxygen_write8_masked);
  76
  77 void 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 }
  86 EXPORT_SYMBOL(oxygen_write16_masked);
  87
  88 void 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 }
  97 EXPORT_SYMBOL(oxygen_write32_masked);
  98
  99 static 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
 128 void 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 }
 151 EXPORT_SYMBOL(oxygen_write_ac97);
 152
 153 u16 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 }
 184 EXPORT_SYMBOL(oxygen_read_ac97);
 185
 186 void 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 }
 194 EXPORT_SYMBOL(oxygen_write_ac97_masked);
 195
 196 void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
 197 {
 198         unsigned int count;
 199
 200         /* should not need more than 7.68 us (24 * 320 ns) */
 201         count = 10;
 202         while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
 203                && count > 0) {
 204                 udelay(1);
 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 }
 214 EXPORT_SYMBOL(oxygen_write_spi);
 215
 216 void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
 217 {
 218         unsigned long timeout;
 219
 220         /* should not need more than about 300 us */
 221         timeout = jiffies + msecs_to_jiffies(1);
 222         do {
 223                 if (!(oxygen_read16(chip, OXYGEN_2WIRE_BUS_STATUS)
 224                       & OXYGEN_2WIRE_BUSY))
 225                         break;
 226                 udelay(1);
 227                 cond_resched();
 228         } while (time_after_eq(timeout, jiffies));
 229
 230         oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
 231         oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);
 232         oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,
 233                       device | OXYGEN_2WIRE_DIR_WRITE);
 234 }
 235 EXPORT_SYMBOL(oxygen_write_i2c);
 236
 237 static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
 238 {
 239         if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
 240                 msleep(1);
 241         oxygen_write8(chip, OXYGEN_MPU401 + port, data);
 242 }
 243
 244 void oxygen_reset_uart(struct oxygen *chip)
 245 {
 246         _write_uart(chip, 1, MPU401_RESET);
 247         msleep(1); /* wait for ACK */
 248         _write_uart(chip, 1, MPU401_ENTER_UART);
 249 }
 250 EXPORT_SYMBOL(oxygen_reset_uart);
 251
 252 void oxygen_write_uart(struct oxygen *chip, u8 data)
 253 {
 254         _write_uart(chip, 0, data);
 255 }
 256 EXPORT_SYMBOL(oxygen_write_uart);