// 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 <[email protected]>
*/
#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/mod_devicetable.h>
#include <linux/mutex.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_MAPLE,
};
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_MAPLE,
};
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;
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;
config = i2c_get_match_data(i2c);
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 = lochnagar_of_match,
.suppress_bind_attrs = true,
},
.probe = 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);
Codebase Browser
linux