1 // SPDX-License-Identifier: GPL-2.0-only
3  * C-Media CMI8788 driver - helper functions
16 u8 oxygen_read8(struct oxygen *chip, unsigned int reg)  in oxygen_read8()  argument
18 	return inb(chip->addr + reg);  in oxygen_read8()
22 u16 oxygen_read16(struct oxygen *chip, unsigned int reg)  in oxygen_read16()  argument
24 	return inw(chip->addr + reg);  in oxygen_read16()
28 u32 oxygen_read32(struct oxygen *chip, unsigned int reg)  in oxygen_read32()  argument
30 	return inl(chip->addr + reg);  in oxygen_read32()
34 void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value)  in oxygen_write8()  argument
36 	outb(value, chip->addr + reg);  in oxygen_write8()
37 	chip->saved_registers._8[reg] = value;  in oxygen_write8()
41 void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value)  in oxygen_write16()  argument
43 	outw(value, chip->addr + reg);  in oxygen_write16()
44 	chip->saved_registers._16[reg / 2] = cpu_to_le16(value);  in oxygen_write16()
48 void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value)  in oxygen_write32()  argument
50 	outl(value, chip->addr + reg);  in oxygen_write32()
51 	chip->saved_registers._32[reg / 4] = cpu_to_le32(value);  in oxygen_write32()
55 void oxygen_write8_masked(struct oxygen *chip, unsigned int reg,  in oxygen_write8_masked()  argument
58 	u8 tmp = inb(chip->addr + reg);  in oxygen_write8_masked()
61 	outb(tmp, chip->addr + reg);  in oxygen_write8_masked()
62 	chip->saved_registers._8[reg] = tmp;  in oxygen_write8_masked()
66 void oxygen_write16_masked(struct oxygen *chip, unsigned int reg,  in oxygen_write16_masked()  argument
69 	u16 tmp = inw(chip->addr + reg);  in oxygen_write16_masked()
72 	outw(tmp, chip->addr + reg);  in oxygen_write16_masked()
73 	chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp);  in oxygen_write16_masked()
77 void oxygen_write32_masked(struct oxygen *chip, unsigned int reg,  in oxygen_write32_masked()  argument
80 	u32 tmp = inl(chip->addr + reg);  in oxygen_write32_masked()
83 	outl(tmp, chip->addr + reg);  in oxygen_write32_masked()
84 	chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp);  in oxygen_write32_masked()
88 static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)  in oxygen_ac97_wait()  argument
93 	 * Reading the status register also clears the bits, so we have to save  in oxygen_ac97_wait()
96 	wait_event_timeout(chip->ac97_waitqueue,  in oxygen_ac97_wait()
97 			   ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);  in oxygen_ac97_wait()
102 	 * the AC'97 interrupt to be enabled.  in oxygen_ac97_wait()
104 	status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);  in oxygen_ac97_wait()
105 	return status & mask ? 0 : -EIO;  in oxygen_ac97_wait()
109  * About 10% of AC'97 register reads or writes fail to complete, but even those
110  * where the controller indicates completion aren't guaranteed to have actually
113  * It's hard to assign blame to either the controller or the codec because both
114  * were made by C-Media ...
117 void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,  in oxygen_write_ac97()  argument
128 	for (count = 5; count > 0; --count) {  in oxygen_write_ac97()
130 		oxygen_write32(chip, OXYGEN_AC97_REGS, reg);  in oxygen_write_ac97()
131 		/* require two "completed" writes, just to be sure */  in oxygen_write_ac97()
132 		if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 &&  in oxygen_write_ac97()
134 			chip->saved_ac97_registers[codec][index / 2] = data;  in oxygen_write_ac97()
138 	dev_err(chip->card->dev, "AC'97 write timeout\n");  in oxygen_write_ac97()
142 u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec,  in oxygen_read_ac97()  argument
152 	for (count = 5; count > 0; --count) {  in oxygen_read_ac97()
154 		oxygen_write32(chip, OXYGEN_AC97_REGS, reg);  in oxygen_read_ac97()
156 		if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) {  in oxygen_read_ac97()
157 			u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS);  in oxygen_read_ac97()
163 			 * Invert the register value bits to make sure that two  in oxygen_read_ac97()
170 	dev_err(chip->card->dev, "AC'97 read timeout on codec %u\n", codec);  in oxygen_read_ac97()
175 void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,  in oxygen_write_ac97_masked()  argument
178 	u16 value = oxygen_read_ac97(chip, codec, index);  in oxygen_write_ac97_masked()
181 	oxygen_write_ac97(chip, codec, index, value);  in oxygen_write_ac97_masked()
185 static int oxygen_wait_spi(struct oxygen *chip)  in oxygen_wait_spi()  argument
190 	 * Higher timeout to be sure: 200 us;  in oxygen_wait_spi()
193 	for (count = 50; count > 0; count--) {  in oxygen_wait_spi()
195 		if ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) &  in oxygen_wait_spi()
199 	dev_err(chip->card->dev, "oxygen: SPI wait timeout\n");  in oxygen_wait_spi()
200 	return -EIO;  in oxygen_wait_spi()
203 int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)  in oxygen_write_spi()  argument
206 	 * We need to wait AFTER initiating the SPI transaction,  in oxygen_write_spi()
209 	oxygen_write8(chip, OXYGEN_SPI_DATA1, data);  in oxygen_write_spi()
210 	oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);  in oxygen_write_spi()
212 		oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);  in oxygen_write_spi()
213 	oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);  in oxygen_write_spi()
214 	return oxygen_wait_spi(chip);  in oxygen_write_spi()
218 void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)  in oxygen_write_i2c()  argument
223 	oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);  in oxygen_write_i2c()
224 	oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);  in oxygen_write_i2c()
225 	oxygen_write8(chip, OXYGEN_2WIRE_CONTROL,  in oxygen_write_i2c()
230 static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)  in _write_uart()  argument
232 	if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)  in _write_uart()
234 	oxygen_write8(chip, OXYGEN_MPU401 + port, data);  in _write_uart()
237 void oxygen_reset_uart(struct oxygen *chip)  in oxygen_reset_uart()  argument
239 	_write_uart(chip, 1, MPU401_RESET);  in oxygen_reset_uart()
241 	_write_uart(chip, 1, MPU401_ENTER_UART);  in oxygen_reset_uart()
245 void oxygen_write_uart(struct oxygen *chip, u8 data)  in oxygen_write_uart()  argument
247 	_write_uart(chip, 0, data);  in oxygen_write_uart()
251 u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index)  in oxygen_read_eeprom()  argument
255 	oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,  in oxygen_read_eeprom()
259 		if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)  in oxygen_read_eeprom()
263 	return oxygen_read16(chip, OXYGEN_EEPROM_DATA);  in oxygen_read_eeprom()
266 void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value)  in oxygen_write_eeprom()  argument
270 	oxygen_write16(chip, OXYGEN_EEPROM_DATA, value);  in oxygen_write_eeprom()
271 	oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,  in oxygen_write_eeprom()
275 		if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)  in oxygen_write_eeprom()
279 	dev_err(chip->card->dev, "EEPROM write timeout\n");  in oxygen_write_eeprom()