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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 <linux/export.h>
 23 #include <sound/core.h>
 24 #include <sound/mpu401.h>
 25 #include <asm/io.h>
 26 #include "oxygen.h"
 27 
 28 u8 oxygen_read8(struct oxygen *chip, unsigned int reg)
 29 {
 30         return inb(chip->addr + reg);
 31 }
 32 EXPORT_SYMBOL(oxygen_read8);
 33 
 34 u16 oxygen_read16(struct oxygen *chip, unsigned int reg)
 35 {
 36         return inw(chip->addr + reg);
 37 }
 38 EXPORT_SYMBOL(oxygen_read16);
 39 
 40 u32 oxygen_read32(struct oxygen *chip, unsigned int reg)
 41 {
 42         return inl(chip->addr + reg);
 43 }
 44 EXPORT_SYMBOL(oxygen_read32);
 45 
 46 void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value)
 47 {
 48         outb(value, chip->addr + reg);
 49         chip->saved_registers._8[reg] = value;
 50 }
 51 EXPORT_SYMBOL(oxygen_write8);
 52 
 53 void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value)
 54 {
 55         outw(value, chip->addr + reg);
 56         chip->saved_registers._16[reg / 2] = cpu_to_le16(value);
 57 }
 58 EXPORT_SYMBOL(oxygen_write16);
 59 
 60 void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value)
 61 {
 62         outl(value, chip->addr + reg);
 63         chip->saved_registers._32[reg / 4] = cpu_to_le32(value);
 64 }
 65 EXPORT_SYMBOL(oxygen_write32);
 66 
 67 void oxygen_write8_masked(struct oxygen *chip, unsigned int reg,
 68                           u8 value, u8 mask)
 69 {
 70         u8 tmp = inb(chip->addr + reg);
 71         tmp &= ~mask;
 72         tmp |= value & mask;
 73         outb(tmp, chip->addr + reg);
 74         chip->saved_registers._8[reg] = tmp;
 75 }
 76 EXPORT_SYMBOL(oxygen_write8_masked);
 77 
 78 void oxygen_write16_masked(struct oxygen *chip, unsigned int reg,
 79                            u16 value, u16 mask)
 80 {
 81         u16 tmp = inw(chip->addr + reg);
 82         tmp &= ~mask;
 83         tmp |= value & mask;
 84         outw(tmp, chip->addr + reg);
 85         chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp);
 86 }
 87 EXPORT_SYMBOL(oxygen_write16_masked);
 88 
 89 void oxygen_write32_masked(struct oxygen *chip, unsigned int reg,
 90                            u32 value, u32 mask)
 91 {
 92         u32 tmp = inl(chip->addr + reg);
 93         tmp &= ~mask;
 94         tmp |= value & mask;
 95         outl(tmp, chip->addr + reg);
 96         chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp);
 97 }
 98 EXPORT_SYMBOL(oxygen_write32_masked);
 99 
100 static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
101 {
102         u8 status = 0;
103 
104         /*
105          * Reading the status register also clears the bits, so we have to save
106          * the read bits in status.
107          */
108         wait_event_timeout(chip->ac97_waitqueue,
109                            ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
110                               status & mask; }),
111                            msecs_to_jiffies(1) + 1);
112         /*
113          * Check even after a timeout because this function should not require
114          * the AC'97 interrupt to be enabled.
115          */
116         status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
117         return status & mask ? 0 : -EIO;
118 }
119 
120 /*
121  * About 10% of AC'97 register reads or writes fail to complete, but even those
122  * where the controller indicates completion aren't guaranteed to have actually
123  * happened.
124  *
125  * It's hard to assign blame to either the controller or the codec because both
126  * were made by C-Media ...
127  */
128 
129 void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,
130                        unsigned int index, u16 data)
131 {
132         unsigned int count, succeeded;
133         u32 reg;
134 
135         reg = data;
136         reg |= index << OXYGEN_AC97_REG_ADDR_SHIFT;
137         reg |= OXYGEN_AC97_REG_DIR_WRITE;
138         reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
139         succeeded = 0;
140         for (count = 5; count > 0; --count) {
141                 udelay(5);
142                 oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
143                 /* require two "completed" writes, just to be sure */
144                 if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 &&
145                     ++succeeded >= 2) {
146                         chip->saved_ac97_registers[codec][index / 2] = data;
147                         return;
148                 }
149         }
150         snd_printk(KERN_ERR "AC'97 write timeout\n");
151 }
152 EXPORT_SYMBOL(oxygen_write_ac97);
153 
154 u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec,
155                      unsigned int index)
156 {
157         unsigned int count;
158         unsigned int last_read = UINT_MAX;
159         u32 reg;
160 
161         reg = index << OXYGEN_AC97_REG_ADDR_SHIFT;
162         reg |= OXYGEN_AC97_REG_DIR_READ;
163         reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT;
164         for (count = 5; count > 0; --count) {
165                 udelay(5);
166                 oxygen_write32(chip, OXYGEN_AC97_REGS, reg);
167                 udelay(10);
168                 if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) {
169                         u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS);
170                         /* we require two consecutive reads of the same value */
171                         if (value == last_read)
172                                 return value;
173                         last_read = value;
174                         /*
175                          * Invert the register value bits to make sure that two
176                          * consecutive unsuccessful reads do not return the same
177                          * value.
178                          */
179                         reg ^= 0xffff;
180                 }
181         }
182         snd_printk(KERN_ERR "AC'97 read timeout on codec %u\n", codec);
183         return 0;
184 }
185 EXPORT_SYMBOL(oxygen_read_ac97);
186 
187 void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
188                               unsigned int index, u16 data, u16 mask)
189 {
190         u16 value = oxygen_read_ac97(chip, codec, index);
191         value &= ~mask;
192         value |= data & mask;
193         oxygen_write_ac97(chip, codec, index, value);
194 }
195 EXPORT_SYMBOL(oxygen_write_ac97_masked);
196 
197 void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
198 {
199         unsigned int count;
200 
201         /* should not need more than 30.72 us (24 * 1.28 us) */
202         count = 10;
203         while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
204                && count > 0) {
205                 udelay(4);
206                 --count;
207         }
208 
209         oxygen_write8(chip, OXYGEN_SPI_DATA1, data);
210         oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);
211         if (control & OXYGEN_SPI_DATA_LENGTH_3)
212                 oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);
213         oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);
214 }
215 EXPORT_SYMBOL(oxygen_write_spi);
216 
217 void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
218 {
219         /* should not need more than about 300 us */
220         msleep(1);
221 
222         oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
223         oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);
224         oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,
225                       device | OXYGEN_2WIRE_DIR_WRITE);
226 }
227 EXPORT_SYMBOL(oxygen_write_i2c);
228 
229 static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
230 {
231         if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
232                 msleep(1);
233         oxygen_write8(chip, OXYGEN_MPU401 + port, data);
234 }
235 
236 void oxygen_reset_uart(struct oxygen *chip)
237 {
238         _write_uart(chip, 1, MPU401_RESET);
239         msleep(1); /* wait for ACK */
240         _write_uart(chip, 1, MPU401_ENTER_UART);
241 }
242 EXPORT_SYMBOL(oxygen_reset_uart);
243 
244 void oxygen_write_uart(struct oxygen *chip, u8 data)
245 {
246         _write_uart(chip, 0, data);
247 }
248 EXPORT_SYMBOL(oxygen_write_uart);
249 
250 u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index)
251 {
252         unsigned int timeout;
253 
254         oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
255                       index | OXYGEN_EEPROM_DIR_READ);
256         for (timeout = 0; timeout < 100; ++timeout) {
257                 udelay(1);
258                 if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
259                       & OXYGEN_EEPROM_BUSY))
260                         break;
261         }
262         return oxygen_read16(chip, OXYGEN_EEPROM_DATA);
263 }
264 
265 void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value)
266 {
267         unsigned int timeout;
268 
269         oxygen_write16(chip, OXYGEN_EEPROM_DATA, value);
270         oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
271                       index | OXYGEN_EEPROM_DIR_WRITE);
272         for (timeout = 0; timeout < 10; ++timeout) {
273                 msleep(1);
274                 if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
275                       & OXYGEN_EEPROM_BUSY))
276                         return;
277         }
278         snd_printk(KERN_ERR "EEPROM write timeout\n");
279 }
280 

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