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i2c: stm32f7: Add SMBus Host-Notify protocol support 

Rely on the core functions to implement the host-notify
protocol via the a I2C slave device.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Alain Volmat 2020-08-03 07:17:56 +02:00 committed by Wolfram Sang
parent 2a71593da3
commit 6af0771946
2 changed files with 97 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/i2c/busses/Kconfig
View File

@ -1025,6 +1025,7 @@ config I2C_STM32F7
tristate "STMicroelectronics STM32F7 I2C support"
depends on ARCH_STM32 || COMPILE_TEST
select I2C_SLAVE
select I2C_SMBUS
help
Enable this option to add support for STM32 I2C controller embedded
in STM32F7 SoCs.

112
drivers/i2c/busses/i2c-stm32f7.c
View File

@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
@ -50,6 +51,7 @@
/* STM32F7 I2C control 1 */
#define STM32F7_I2C_CR1_PECEN BIT(23)
#define STM32F7_I2C_CR1_SMBHEN BIT(20)
#define STM32F7_I2C_CR1_WUPEN BIT(18)
#define STM32F7_I2C_CR1_SBC BIT(16)
#define STM32F7_I2C_CR1_RXDMAEN BIT(15)
@ -150,7 +152,7 @@
#define STM32F7_I2C_MAX_LEN 0xff
#define STM32F7_I2C_DMA_LEN_MIN 0x16
#define STM32F7_I2C_MAX_SLAVE 0x2
#define STM32F7_I2C_MAX_SLAVE 0x3
#define STM32F7_I2C_DNF_DEFAULT 0
#define STM32F7_I2C_DNF_MAX 16
@ -301,6 +303,8 @@ struct stm32f7_i2c_msg {
* @fmp_creg: register address for clearing Fast Mode Plus bits
* @fmp_mask: mask for Fast Mode Plus bits in set register
* @wakeup_src: boolean to know if the device is a wakeup source
* @smbus_mode: states that the controller is configured in SMBus mode
* @host_notify_client: SMBus host-notify client
*/
struct stm32f7_i2c_dev {
struct i2c_adapter adap;
@ -327,6 +331,8 @@ struct stm32f7_i2c_dev {
u32 fmp_creg;
u32 fmp_mask;
bool wakeup_src;
bool smbus_mode;
struct i2c_client *host_notify_client;
};
/*
@ -1321,11 +1327,19 @@ static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev,
int i;
/*
* slave[0] supports 7-bit and 10-bit slave address
* slave[1] supports 7-bit slave address only
* slave[0] support only SMBus Host address (0x8)
* slave[1] supports 7-bit and 10-bit slave address
* slave[2] supports 7-bit slave address only
*/
for (i = STM32F7_I2C_MAX_SLAVE - 1; i >= 0; i--) {
if (i == 1 && (slave->flags & I2C_CLIENT_TEN))
if (i2c_dev->smbus_mode && (slave->addr == 0x08)) {
if (i2c_dev->slave[0])
goto fail;
*id = 0;
return 0;
}
for (i = STM32F7_I2C_MAX_SLAVE - 1; i > 0; i--) {
if (i == 2 && (slave->flags & I2C_CLIENT_TEN))
continue;
if (!i2c_dev->slave[i]) {
*id = i;
@ -1333,6 +1347,7 @@ static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev,
}
}
fail:
dev_err(dev, "Slave 0x%x could not be registered\n", slave->addr);
return -EINVAL;
@ -1776,7 +1791,13 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
if (!stm32f7_i2c_is_slave_registered(i2c_dev))
stm32f7_i2c_enable_wakeup(i2c_dev, true);
if (id == 0) {
switch (id) {
case 0:
/* Slave SMBus Host */
i2c_dev->slave[id] = slave;
break;
case 1:
/* Configure Own Address 1 */
oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
oar1 &= ~STM32F7_I2C_OAR1_MASK;
@ -1789,7 +1810,9 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
oar1 |= STM32F7_I2C_OAR1_OA1EN;
i2c_dev->slave[id] = slave;
writel_relaxed(oar1, i2c_dev->base + STM32F7_I2C_OAR1);
} else if (id == 1) {
break;
case 2:
/* Configure Own Address 2 */
oar2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR2);
oar2 &= ~STM32F7_I2C_OAR2_MASK;
@ -1802,7 +1825,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
oar2 |= STM32F7_I2C_OAR2_OA2EN;
i2c_dev->slave[id] = slave;
writel_relaxed(oar2, i2c_dev->base + STM32F7_I2C_OAR2);
} else {
break;
default:
dev_err(dev, "I2C slave id not supported\n");
ret = -ENODEV;
goto pm_free;
}
@ -1843,10 +1869,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
if (ret < 0)
return ret;
if (id == 0) {
if (id == 1) {
mask = STM32F7_I2C_OAR1_OA1EN;
stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR1, mask);
} else {
} else if (id == 2) {
mask = STM32F7_I2C_OAR2_OA2EN;
stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR2, mask);
}
@ -1911,14 +1937,51 @@ static int stm32f7_i2c_setup_fm_plus_bits(struct platform_device *pdev,
&i2c_dev->fmp_mask);
}
static int stm32f7_i2c_enable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
{
struct i2c_adapter *adap = &i2c_dev->adap;
void __iomem *base = i2c_dev->base;
struct i2c_client *client;
client = i2c_new_slave_host_notify_device(adap);
if (IS_ERR(client))
return PTR_ERR(client);
i2c_dev->host_notify_client = client;
/* Enable SMBus Host address */
stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_SMBHEN);
return 0;
}
static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
{
void __iomem *base = i2c_dev->base;
if (i2c_dev->host_notify_client) {
/* Disable SMBus Host address */
stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
STM32F7_I2C_CR1_SMBHEN);
i2c_free_slave_host_notify_device(i2c_dev->host_notify_client);
}
}
static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SLAVE |
I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC |
I2C_FUNC_SMBUS_I2C_BLOCK;
struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
u32 func = I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SLAVE |
I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC |
I2C_FUNC_SMBUS_I2C_BLOCK;
if (i2c_dev->smbus_mode)
func |= I2C_FUNC_SMBUS_HOST_NOTIFY;
return func;
}
static const struct i2c_algorithm stm32f7_i2c_algo = {
@ -2084,10 +2147,22 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
stm32f7_i2c_hw_config(i2c_dev);
i2c_dev->smbus_mode = of_property_read_bool(pdev->dev.of_node, "smbus");
ret = i2c_add_adapter(adap);
if (ret)
goto pm_disable;
if (i2c_dev->smbus_mode) {
ret = stm32f7_i2c_enable_smbus_host(i2c_dev);
if (ret) {
dev_err(i2c_dev->dev,
"failed to enable SMBus Host-Notify protocol (%d)\n",
ret);
goto i2c_adapter_remove;
}
}
dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
pm_runtime_mark_last_busy(i2c_dev->dev);
@ -2095,6 +2170,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
return 0;
i2c_adapter_remove:
i2c_del_adapter(adap);
pm_disable:
pm_runtime_put_noidle(i2c_dev->dev);
pm_runtime_disable(i2c_dev->dev);
@ -2126,6 +2204,8 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
{
struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
stm32f7_i2c_disable_smbus_host(i2c_dev);
i2c_del_adapter(&i2c_dev->adap);
pm_runtime_get_sync(i2c_dev->dev);