mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
399 lines
11 KiB
C
399 lines
11 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
/*
|
||
|
* Lochnagar I2C bus interface
|
||
|
*
|
||
|
* Copyright (c) 2012-2018 Cirrus Logic, Inc. and
|
||
|
* Cirrus Logic International Semiconductor Ltd.
|
||
|
*
|
||
|
* Author: Charles Keepax <ckeepax@opensource.cirrus.com>
|
||
|
*/
|
||
|
|
||
|
#include <linux/delay.h>
|
||
|
#include <linux/device.h>
|
||
|
#include <linux/err.h>
|
||
|
#include <linux/gpio/consumer.h>
|
||
|
#include <linux/i2c.h>
|
||
|
#include <linux/lockdep.h>
|
||
|
#include <linux/mfd/core.h>
|
||
|
#include <linux/mutex.h>
|
||
|
#include <linux/of.h>
|
||
|
#include <linux/of_platform.h>
|
||
|
#include <linux/regmap.h>
|
||
|
|
||
|
#include <linux/mfd/lochnagar.h>
|
||
|
#include <linux/mfd/lochnagar1_regs.h>
|
||
|
#include <linux/mfd/lochnagar2_regs.h>
|
||
|
|
||
|
#define LOCHNAGAR_BOOT_RETRIES 10
|
||
|
#define LOCHNAGAR_BOOT_DELAY_MS 350
|
||
|
|
||
|
#define LOCHNAGAR_CONFIG_POLL_US 10000
|
||
|
|
||
|
static bool lochnagar1_readable_register(struct device *dev, unsigned int reg)
|
||
|
{
|
||
|
switch (reg) {
|
||
|
case LOCHNAGAR_SOFTWARE_RESET:
|
||
|
case LOCHNAGAR_FIRMWARE_ID1...LOCHNAGAR_FIRMWARE_ID2:
|
||
|
case LOCHNAGAR1_CDC_AIF1_SEL...LOCHNAGAR1_CDC_AIF3_SEL:
|
||
|
case LOCHNAGAR1_CDC_MCLK1_SEL...LOCHNAGAR1_CDC_MCLK2_SEL:
|
||
|
case LOCHNAGAR1_CDC_AIF_CTRL1...LOCHNAGAR1_CDC_AIF_CTRL2:
|
||
|
case LOCHNAGAR1_EXT_AIF_CTRL:
|
||
|
case LOCHNAGAR1_DSP_AIF1_SEL...LOCHNAGAR1_DSP_AIF2_SEL:
|
||
|
case LOCHNAGAR1_DSP_CLKIN_SEL:
|
||
|
case LOCHNAGAR1_DSP_AIF:
|
||
|
case LOCHNAGAR1_GF_AIF1...LOCHNAGAR1_GF_AIF2:
|
||
|
case LOCHNAGAR1_PSIA_AIF:
|
||
|
case LOCHNAGAR1_PSIA1_SEL...LOCHNAGAR1_PSIA2_SEL:
|
||
|
case LOCHNAGAR1_SPDIF_AIF_SEL:
|
||
|
case LOCHNAGAR1_GF_AIF3_SEL...LOCHNAGAR1_GF_AIF4_SEL:
|
||
|
case LOCHNAGAR1_GF_CLKOUT1_SEL:
|
||
|
case LOCHNAGAR1_GF_AIF1_SEL...LOCHNAGAR1_GF_AIF2_SEL:
|
||
|
case LOCHNAGAR1_GF_GPIO2...LOCHNAGAR1_GF_GPIO7:
|
||
|
case LOCHNAGAR1_RST:
|
||
|
case LOCHNAGAR1_LED1...LOCHNAGAR1_LED2:
|
||
|
case LOCHNAGAR1_I2C_CTRL:
|
||
|
return true;
|
||
|
default:
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static const struct regmap_config lochnagar1_i2c_regmap = {
|
||
|
.reg_bits = 8,
|
||
|
.val_bits = 8,
|
||
|
.reg_format_endian = REGMAP_ENDIAN_BIG,
|
||
|
.val_format_endian = REGMAP_ENDIAN_BIG,
|
||
|
|
||
|
.max_register = 0x50,
|
||
|
.readable_reg = lochnagar1_readable_register,
|
||
|
|
||
|
.use_single_read = true,
|
||
|
.use_single_write = true,
|
||
|
|
||
|
.cache_type = REGCACHE_RBTREE,
|
||
|
};
|
||
|
|
||
|
static const struct reg_sequence lochnagar1_patch[] = {
|
||
|
{ 0x40, 0x0083 },
|
||
|
{ 0x47, 0x0018 },
|
||
|
{ 0x50, 0x0000 },
|
||
|
};
|
||
|
|
||
|
static bool lochnagar2_readable_register(struct device *dev, unsigned int reg)
|
||
|
{
|
||
|
switch (reg) {
|
||
|
case LOCHNAGAR_SOFTWARE_RESET:
|
||
|
case LOCHNAGAR_FIRMWARE_ID1...LOCHNAGAR_FIRMWARE_ID2:
|
||
|
case LOCHNAGAR2_CDC_AIF1_CTRL...LOCHNAGAR2_CDC_AIF3_CTRL:
|
||
|
case LOCHNAGAR2_DSP_AIF1_CTRL...LOCHNAGAR2_DSP_AIF2_CTRL:
|
||
|
case LOCHNAGAR2_PSIA1_CTRL...LOCHNAGAR2_PSIA2_CTRL:
|
||
|
case LOCHNAGAR2_GF_AIF3_CTRL...LOCHNAGAR2_GF_AIF4_CTRL:
|
||
|
case LOCHNAGAR2_GF_AIF1_CTRL...LOCHNAGAR2_GF_AIF2_CTRL:
|
||
|
case LOCHNAGAR2_SPDIF_AIF_CTRL:
|
||
|
case LOCHNAGAR2_USB_AIF1_CTRL...LOCHNAGAR2_USB_AIF2_CTRL:
|
||
|
case LOCHNAGAR2_ADAT_AIF_CTRL:
|
||
|
case LOCHNAGAR2_CDC_MCLK1_CTRL...LOCHNAGAR2_CDC_MCLK2_CTRL:
|
||
|
case LOCHNAGAR2_DSP_CLKIN_CTRL:
|
||
|
case LOCHNAGAR2_PSIA1_MCLK_CTRL...LOCHNAGAR2_PSIA2_MCLK_CTRL:
|
||
|
case LOCHNAGAR2_SPDIF_MCLK_CTRL:
|
||
|
case LOCHNAGAR2_GF_CLKOUT1_CTRL...LOCHNAGAR2_GF_CLKOUT2_CTRL:
|
||
|
case LOCHNAGAR2_ADAT_MCLK_CTRL:
|
||
|
case LOCHNAGAR2_SOUNDCARD_MCLK_CTRL:
|
||
|
case LOCHNAGAR2_GPIO_FPGA_GPIO1...LOCHNAGAR2_GPIO_FPGA_GPIO6:
|
||
|
case LOCHNAGAR2_GPIO_CDC_GPIO1...LOCHNAGAR2_GPIO_CDC_GPIO8:
|
||
|
case LOCHNAGAR2_GPIO_DSP_GPIO1...LOCHNAGAR2_GPIO_DSP_GPIO6:
|
||
|
case LOCHNAGAR2_GPIO_GF_GPIO2...LOCHNAGAR2_GPIO_GF_GPIO7:
|
||
|
case LOCHNAGAR2_GPIO_CDC_AIF1_BCLK...LOCHNAGAR2_GPIO_CDC_AIF3_TXDAT:
|
||
|
case LOCHNAGAR2_GPIO_DSP_AIF1_BCLK...LOCHNAGAR2_GPIO_DSP_AIF2_TXDAT:
|
||
|
case LOCHNAGAR2_GPIO_PSIA1_BCLK...LOCHNAGAR2_GPIO_PSIA2_TXDAT:
|
||
|
case LOCHNAGAR2_GPIO_GF_AIF3_BCLK...LOCHNAGAR2_GPIO_GF_AIF4_TXDAT:
|
||
|
case LOCHNAGAR2_GPIO_GF_AIF1_BCLK...LOCHNAGAR2_GPIO_GF_AIF2_TXDAT:
|
||
|
case LOCHNAGAR2_GPIO_DSP_UART1_RX...LOCHNAGAR2_GPIO_DSP_UART2_TX:
|
||
|
case LOCHNAGAR2_GPIO_GF_UART2_RX...LOCHNAGAR2_GPIO_GF_UART2_TX:
|
||
|
case LOCHNAGAR2_GPIO_USB_UART_RX:
|
||
|
case LOCHNAGAR2_GPIO_CDC_PDMCLK1...LOCHNAGAR2_GPIO_CDC_PDMDAT2:
|
||
|
case LOCHNAGAR2_GPIO_CDC_DMICCLK1...LOCHNAGAR2_GPIO_CDC_DMICDAT4:
|
||
|
case LOCHNAGAR2_GPIO_DSP_DMICCLK1...LOCHNAGAR2_GPIO_DSP_DMICDAT2:
|
||
|
case LOCHNAGAR2_GPIO_I2C2_SCL...LOCHNAGAR2_GPIO_I2C4_SDA:
|
||
|
case LOCHNAGAR2_GPIO_DSP_STANDBY:
|
||
|
case LOCHNAGAR2_GPIO_CDC_MCLK1...LOCHNAGAR2_GPIO_CDC_MCLK2:
|
||
|
case LOCHNAGAR2_GPIO_DSP_CLKIN:
|
||
|
case LOCHNAGAR2_GPIO_PSIA1_MCLK...LOCHNAGAR2_GPIO_PSIA2_MCLK:
|
||
|
case LOCHNAGAR2_GPIO_GF_GPIO1...LOCHNAGAR2_GPIO_GF_GPIO5:
|
||
|
case LOCHNAGAR2_GPIO_DSP_GPIO20:
|
||
|
case LOCHNAGAR2_GPIO_CHANNEL1...LOCHNAGAR2_GPIO_CHANNEL16:
|
||
|
case LOCHNAGAR2_MINICARD_RESETS:
|
||
|
case LOCHNAGAR2_ANALOGUE_PATH_CTRL1...LOCHNAGAR2_ANALOGUE_PATH_CTRL2:
|
||
|
case LOCHNAGAR2_COMMS_CTRL4:
|
||
|
case LOCHNAGAR2_SPDIF_CTRL:
|
||
|
case LOCHNAGAR2_IMON_CTRL1...LOCHNAGAR2_IMON_CTRL4:
|
||
|
case LOCHNAGAR2_IMON_DATA1...LOCHNAGAR2_IMON_DATA2:
|
||
|
case LOCHNAGAR2_POWER_CTRL:
|
||
|
case LOCHNAGAR2_MICVDD_CTRL1:
|
||
|
case LOCHNAGAR2_MICVDD_CTRL2:
|
||
|
case LOCHNAGAR2_VDDCORE_CDC_CTRL1:
|
||
|
case LOCHNAGAR2_VDDCORE_CDC_CTRL2:
|
||
|
case LOCHNAGAR2_SOUNDCARD_AIF_CTRL:
|
||
|
return true;
|
||
|
default:
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static bool lochnagar2_volatile_register(struct device *dev, unsigned int reg)
|
||
|
{
|
||
|
switch (reg) {
|
||
|
case LOCHNAGAR2_GPIO_CHANNEL1...LOCHNAGAR2_GPIO_CHANNEL16:
|
||
|
case LOCHNAGAR2_ANALOGUE_PATH_CTRL1:
|
||
|
case LOCHNAGAR2_IMON_CTRL3...LOCHNAGAR2_IMON_CTRL4:
|
||
|
case LOCHNAGAR2_IMON_DATA1...LOCHNAGAR2_IMON_DATA2:
|
||
|
return true;
|
||
|
default:
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static const struct regmap_config lochnagar2_i2c_regmap = {
|
||
|
.reg_bits = 16,
|
||
|
.val_bits = 16,
|
||
|
.reg_format_endian = REGMAP_ENDIAN_BIG,
|
||
|
.val_format_endian = REGMAP_ENDIAN_BIG,
|
||
|
|
||
|
.max_register = 0x1F1F,
|
||
|
.readable_reg = lochnagar2_readable_register,
|
||
|
.volatile_reg = lochnagar2_volatile_register,
|
||
|
|
||
|
.cache_type = REGCACHE_RBTREE,
|
||
|
};
|
||
|
|
||
|
static const struct reg_sequence lochnagar2_patch[] = {
|
||
|
{ 0x00EE, 0x0000 },
|
||
|
};
|
||
|
|
||
|
struct lochnagar_config {
|
||
|
int id;
|
||
|
const char * const name;
|
||
|
enum lochnagar_type type;
|
||
|
const struct regmap_config *regmap;
|
||
|
const struct reg_sequence *patch;
|
||
|
int npatch;
|
||
|
};
|
||
|
|
||
|
static struct lochnagar_config lochnagar_configs[] = {
|
||
|
{
|
||
|
.id = 0x50,
|
||
|
.name = "lochnagar1",
|
||
|
.type = LOCHNAGAR1,
|
||
|
.regmap = &lochnagar1_i2c_regmap,
|
||
|
.patch = lochnagar1_patch,
|
||
|
.npatch = ARRAY_SIZE(lochnagar1_patch),
|
||
|
},
|
||
|
{
|
||
|
.id = 0xCB58,
|
||
|
.name = "lochnagar2",
|
||
|
.type = LOCHNAGAR2,
|
||
|
.regmap = &lochnagar2_i2c_regmap,
|
||
|
.patch = lochnagar2_patch,
|
||
|
.npatch = ARRAY_SIZE(lochnagar2_patch),
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static const struct of_device_id lochnagar_of_match[] = {
|
||
|
{ .compatible = "cirrus,lochnagar1", .data = &lochnagar_configs[0] },
|
||
|
{ .compatible = "cirrus,lochnagar2", .data = &lochnagar_configs[1] },
|
||
|
{},
|
||
|
};
|
||
|
|
||
|
static int lochnagar_wait_for_boot(struct regmap *regmap, unsigned int *id)
|
||
|
{
|
||
|
int i, ret;
|
||
|
|
||
|
for (i = 0; i < LOCHNAGAR_BOOT_RETRIES; ++i) {
|
||
|
msleep(LOCHNAGAR_BOOT_DELAY_MS);
|
||
|
|
||
|
/* The reset register will return the device ID when read */
|
||
|
ret = regmap_read(regmap, LOCHNAGAR_SOFTWARE_RESET, id);
|
||
|
if (!ret)
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* lochnagar_update_config - Synchronise the boards analogue configuration to
|
||
|
* the hardware.
|
||
|
*
|
||
|
* @lochnagar: A pointer to the primary core data structure.
|
||
|
*
|
||
|
* Return: Zero on success or an appropriate negative error code on failure.
|
||
|
*/
|
||
|
int lochnagar_update_config(struct lochnagar *lochnagar)
|
||
|
{
|
||
|
struct regmap *regmap = lochnagar->regmap;
|
||
|
unsigned int done = LOCHNAGAR2_ANALOGUE_PATH_UPDATE_STS_MASK;
|
||
|
int timeout_ms = LOCHNAGAR_BOOT_DELAY_MS * LOCHNAGAR_BOOT_RETRIES;
|
||
|
unsigned int val = 0;
|
||
|
int ret;
|
||
|
|
||
|
lockdep_assert_held(&lochnagar->analogue_config_lock);
|
||
|
|
||
|
if (lochnagar->type != LOCHNAGAR2)
|
||
|
return 0;
|
||
|
|
||
|
/*
|
||
|
* Toggle the ANALOGUE_PATH_UPDATE bit and wait for the device to
|
||
|
* acknowledge that any outstanding changes to the analogue
|
||
|
* configuration have been applied.
|
||
|
*/
|
||
|
ret = regmap_write(regmap, LOCHNAGAR2_ANALOGUE_PATH_CTRL1, 0);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = regmap_write(regmap, LOCHNAGAR2_ANALOGUE_PATH_CTRL1,
|
||
|
LOCHNAGAR2_ANALOGUE_PATH_UPDATE_MASK);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = regmap_read_poll_timeout(regmap,
|
||
|
LOCHNAGAR2_ANALOGUE_PATH_CTRL1, val,
|
||
|
(val & done), LOCHNAGAR_CONFIG_POLL_US,
|
||
|
timeout_ms * 1000);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(lochnagar_update_config);
|
||
|
|
||
|
static int lochnagar_i2c_probe(struct i2c_client *i2c)
|
||
|
{
|
||
|
struct device *dev = &i2c->dev;
|
||
|
const struct lochnagar_config *config = NULL;
|
||
|
const struct of_device_id *of_id;
|
||
|
struct lochnagar *lochnagar;
|
||
|
struct gpio_desc *reset, *present;
|
||
|
unsigned int val;
|
||
|
unsigned int firmwareid;
|
||
|
unsigned int devid, rev;
|
||
|
int ret;
|
||
|
|
||
|
lochnagar = devm_kzalloc(dev, sizeof(*lochnagar), GFP_KERNEL);
|
||
|
if (!lochnagar)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
of_id = of_match_device(lochnagar_of_match, dev);
|
||
|
if (!of_id)
|
||
|
return -EINVAL;
|
||
|
|
||
|
config = of_id->data;
|
||
|
|
||
|
lochnagar->dev = dev;
|
||
|
mutex_init(&lochnagar->analogue_config_lock);
|
||
|
|
||
|
dev_set_drvdata(dev, lochnagar);
|
||
|
|
||
|
reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
|
||
|
if (IS_ERR(reset)) {
|
||
|
ret = PTR_ERR(reset);
|
||
|
dev_err(dev, "Failed to get reset GPIO: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
present = devm_gpiod_get_optional(dev, "present", GPIOD_OUT_HIGH);
|
||
|
if (IS_ERR(present)) {
|
||
|
ret = PTR_ERR(present);
|
||
|
dev_err(dev, "Failed to get present GPIO: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Leave the Lochnagar in reset for a reasonable amount of time */
|
||
|
msleep(20);
|
||
|
|
||
|
/* Bring Lochnagar out of reset */
|
||
|
gpiod_set_value_cansleep(reset, 1);
|
||
|
|
||
|
/* Identify Lochnagar */
|
||
|
lochnagar->type = config->type;
|
||
|
|
||
|
lochnagar->regmap = devm_regmap_init_i2c(i2c, config->regmap);
|
||
|
if (IS_ERR(lochnagar->regmap)) {
|
||
|
ret = PTR_ERR(lochnagar->regmap);
|
||
|
dev_err(dev, "Failed to allocate register map: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Wait for Lochnagar to boot */
|
||
|
ret = lochnagar_wait_for_boot(lochnagar->regmap, &val);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "Failed to read device ID: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
devid = val & LOCHNAGAR_DEVICE_ID_MASK;
|
||
|
rev = val & LOCHNAGAR_REV_ID_MASK;
|
||
|
|
||
|
if (devid != config->id) {
|
||
|
dev_err(dev,
|
||
|
"ID does not match %s (expected 0x%x got 0x%x)\n",
|
||
|
config->name, config->id, devid);
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
|
||
|
/* Identify firmware */
|
||
|
ret = regmap_read(lochnagar->regmap, LOCHNAGAR_FIRMWARE_ID1, &val);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "Failed to read firmware id 1: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
firmwareid = val;
|
||
|
|
||
|
ret = regmap_read(lochnagar->regmap, LOCHNAGAR_FIRMWARE_ID2, &val);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "Failed to read firmware id 2: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
firmwareid |= (val << config->regmap->val_bits);
|
||
|
|
||
|
dev_info(dev, "Found %s (0x%x) revision %u firmware 0x%.6x\n",
|
||
|
config->name, devid, rev + 1, firmwareid);
|
||
|
|
||
|
ret = regmap_register_patch(lochnagar->regmap, config->patch,
|
||
|
config->npatch);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "Failed to register patch: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = devm_of_platform_populate(dev);
|
||
|
if (ret < 0) {
|
||
|
dev_err(dev, "Failed to populate child nodes: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static struct i2c_driver lochnagar_i2c_driver = {
|
||
|
.driver = {
|
||
|
.name = "lochnagar",
|
||
|
.of_match_table = of_match_ptr(lochnagar_of_match),
|
||
|
.suppress_bind_attrs = true,
|
||
|
},
|
||
|
.probe_new = lochnagar_i2c_probe,
|
||
|
};
|
||
|
|
||
|
static int __init lochnagar_i2c_init(void)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
ret = i2c_add_driver(&lochnagar_i2c_driver);
|
||
|
if (ret)
|
||
|
pr_err("Failed to register Lochnagar driver: %d\n", ret);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
subsys_initcall(lochnagar_i2c_init);
|