diff options
Diffstat (limited to 'target/linux/realtek/files-5.10/drivers/i2c/busses/i2c-rtl9300.c')
| -rw-r--r-- | target/linux/realtek/files-5.10/drivers/i2c/busses/i2c-rtl9300.c | 488 |
1 files changed, 0 insertions, 488 deletions
diff --git a/target/linux/realtek/files-5.10/drivers/i2c/busses/i2c-rtl9300.c b/target/linux/realtek/files-5.10/drivers/i2c/busses/i2c-rtl9300.c deleted file mode 100644 index 382dfd4010..0000000000 --- a/target/linux/realtek/files-5.10/drivers/i2c/busses/i2c-rtl9300.c +++ /dev/null @@ -1,488 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only - -#include <linux/module.h> -#include <linux/of_platform.h> -#include "i2c-rtl9300.h" - -#define REG(i, x) (i->base + x + (i->scl_num ? i->mst2_offset : 0)) -#define REG_MASK(i, clear, set, reg) \ - writel((readl(REG(i, reg)) & ~(clear)) | (set), REG(i, reg)) - -struct i2c_drv_data { - int scl0_pin; - int scl1_pin; - int sda0_pin; - struct i2c_algorithm *algo; - int (*read)(struct rtl9300_i2c *i2c, u8 *buf, int len); - int (*write)(struct rtl9300_i2c *i2c, u8 *buf, int len); - void (*reg_addr_set)(struct rtl9300_i2c *i2c, u32 reg, u16 len); - int (*config_xfer)(struct rtl9300_i2c *i2c, u16 addr, u16 len); - int (*execute_xfer)(struct rtl9300_i2c *i2c, char read_write, int size, - union i2c_smbus_data * data, int len); - void (*writel)(struct rtl9300_i2c *i2c, u32 data); - void (*config_io)(struct rtl9300_i2c *i2c, int scl_num, int sda_num); - u32 mst2_offset; -}; - -DEFINE_MUTEX(i2c_lock); - -static void rtl9300_i2c_reg_addr_set(struct rtl9300_i2c *i2c, u32 reg, u16 len) -{ - // Set register address width - REG_MASK(i2c, 0x3 << RTL9300_I2C_CTRL2_MADDR_WIDTH, len << RTL9300_I2C_CTRL2_MADDR_WIDTH, - RTL9300_I2C_CTRL2); - - // Set register address - REG_MASK(i2c, 0xffffff << RTL9300_I2C_CTRL1_MEM_ADDR, reg << RTL9300_I2C_CTRL1_MEM_ADDR, - RTL9300_I2C_CTRL1); -} - -static void rtl9310_i2c_reg_addr_set(struct rtl9300_i2c *i2c, u32 reg, u16 len) -{ - // Set register address width - REG_MASK(i2c, 0x3 << RTL9310_I2C_CTRL_MADDR_WIDTH, len << RTL9310_I2C_CTRL_MADDR_WIDTH, - RTL9310_I2C_CTRL); - - // Set register address - writel(reg, REG(i2c, RTL9310_I2C_MEMADDR)); -} - -static void rtl9300_i2c_config_io(struct rtl9300_i2c *i2c, int scl_num, int sda_num) -{ - u32 v; - - // Set SCL pin - REG_MASK(i2c, 0, BIT(RTL9300_I2C_CTRL1_GPIO8_SCL_SEL), RTL9300_I2C_CTRL1); - - // Set SDA pin - REG_MASK(i2c, 0x7 << RTL9300_I2C_CTRL1_SDA_OUT_SEL, - i2c->sda_num << RTL9300_I2C_CTRL1_SDA_OUT_SEL, RTL9300_I2C_CTRL1); - - // Set SDA pin to I2C functionality - v = readl(i2c->base + RTL9300_I2C_MST_GLB_CTRL); - v |= BIT(i2c->sda_num); - writel(v, i2c->base + RTL9300_I2C_MST_GLB_CTRL); -} - -static void rtl9310_i2c_config_io(struct rtl9300_i2c *i2c, int scl_num, int sda_num) -{ - u32 v; - - // Set SCL pin - REG_MASK(i2c, 0, BIT(RTL9310_I2C_MST_IF_SEL_GPIO_SCL_SEL + scl_num), RTL9310_I2C_MST_IF_SEL); - - // Set SDA pin - REG_MASK(i2c, 0x7 << RTL9310_I2C_CTRL_SDA_OUT_SEL, - i2c->sda_num << RTL9310_I2C_CTRL_SDA_OUT_SEL, RTL9310_I2C_CTRL); - - // Set SDA pin to I2C functionality - v = readl(i2c->base + RTL9310_I2C_MST_IF_SEL); - v |= BIT(i2c->sda_num); - writel(v, i2c->base + RTL9310_I2C_MST_IF_SEL); -} - -static int rtl9300_i2c_config_xfer(struct rtl9300_i2c *i2c, u16 addr, u16 len) -{ - // Set bus frequency - REG_MASK(i2c, 0x3 << RTL9300_I2C_CTRL2_SCL_FREQ, - i2c->bus_freq << RTL9300_I2C_CTRL2_SCL_FREQ, RTL9300_I2C_CTRL2); - - // Set slave device address - REG_MASK(i2c, 0x7f << RTL9300_I2C_CTRL2_DEV_ADDR, - addr << RTL9300_I2C_CTRL2_DEV_ADDR, RTL9300_I2C_CTRL2); - - // Set data length - REG_MASK(i2c, 0xf << RTL9300_I2C_CTRL2_DATA_WIDTH, - ((len - 1) & 0xf) << RTL9300_I2C_CTRL2_DATA_WIDTH, RTL9300_I2C_CTRL2); - - // Set read mode to random - REG_MASK(i2c, 0x1 << RTL9300_I2C_CTRL2_READ_MODE, 0, RTL9300_I2C_CTRL2); - - return 0; -} - -static int rtl9310_i2c_config_xfer(struct rtl9300_i2c *i2c, u16 addr, u16 len) -{ - // Set bus frequency - REG_MASK(i2c, 0x3 << RTL9310_I2C_CTRL_SCL_FREQ, - i2c->bus_freq << RTL9310_I2C_CTRL_SCL_FREQ, RTL9310_I2C_CTRL); - - // Set slave device address - REG_MASK(i2c, 0x7f << RTL9310_I2C_CTRL_DEV_ADDR, - addr << RTL9310_I2C_CTRL_DEV_ADDR, RTL9310_I2C_CTRL); - - // Set data length - REG_MASK(i2c, 0xf << RTL9310_I2C_CTRL_DATA_WIDTH, - ((len - 1) & 0xf) << RTL9310_I2C_CTRL_DATA_WIDTH, RTL9310_I2C_CTRL); - - // Set read mode to random - REG_MASK(i2c, 0x1 << RTL9310_I2C_CTRL_READ_MODE, 0, RTL9310_I2C_CTRL); - - return 0; -} - -static int i2c_read(void __iomem *r0, u8 *buf, int len) -{ - int i; - u32 v; - - if (len > 16) - return -EIO; - - for (i = 0; i < len; i++) { - if (i % 4 == 0) - v = readl(r0 + i); - buf[i] = v; - v >>= 8; - } - - return len; -} - -static int i2c_write(void __iomem *r0, u8 *buf, int len) -{ - u32 v; - int i; - - if (len > 16) - return -EIO; - - for (i = 0; i < len; i++) { - if (! (i % 4)) - v = 0; - v <<= 8; - v |= buf[i]; - if (i % 4 == 3 || i == len - 1) - writel(v, r0 + (i / 4) * 4); - } - - return len; -} - -static int rtl9300_i2c_read(struct rtl9300_i2c *i2c, u8 *buf, int len) -{ - return i2c_read(REG(i2c, RTL9300_I2C_DATA_WORD0), buf, len); -} - -static int rtl9300_i2c_write(struct rtl9300_i2c *i2c, u8 *buf, int len) -{ - return i2c_write(REG(i2c, RTL9300_I2C_DATA_WORD0), buf, len); -} - -static int rtl9310_i2c_read(struct rtl9300_i2c *i2c, u8 *buf, int len) -{ - return i2c_read(REG(i2c, RTL9310_I2C_DATA), buf, len); -} - -static int rtl9310_i2c_write(struct rtl9300_i2c *i2c, u8 *buf, int len) -{ - return i2c_write(REG(i2c, RTL9310_I2C_DATA), buf, len); -} - -static void rtl9300_writel(struct rtl9300_i2c *i2c, u32 data) -{ - writel(data, REG(i2c, RTL9300_I2C_DATA_WORD0)); -} - -static void rtl9310_writel(struct rtl9300_i2c *i2c, u32 data) -{ - writel(data, REG(i2c, RTL9310_I2C_DATA)); -} - - -static int rtl9300_execute_xfer(struct rtl9300_i2c *i2c, char read_write, - int size, union i2c_smbus_data * data, int len) -{ - u32 v; - - if (read_write == I2C_SMBUS_READ) - REG_MASK(i2c, BIT(RTL9300_I2C_CTRL1_RWOP), 0, RTL9300_I2C_CTRL1); - else - REG_MASK(i2c, 0, BIT(RTL9300_I2C_CTRL1_RWOP), RTL9300_I2C_CTRL1); - - REG_MASK(i2c, 0, BIT(RTL9300_I2C_CTRL1_I2C_TRIG), RTL9300_I2C_CTRL1); - do { - v = readl(REG(i2c, RTL9300_I2C_CTRL1)); - } while (v & BIT(RTL9300_I2C_CTRL1_I2C_TRIG)); - - if (v & BIT(RTL9300_I2C_CTRL1_I2C_FAIL)) - return -EIO; - - if (read_write == I2C_SMBUS_READ) { - if (size == I2C_SMBUS_BYTE || size == I2C_SMBUS_BYTE_DATA){ - data->byte = readl(REG(i2c, RTL9300_I2C_DATA_WORD0)); - } else if (size == I2C_SMBUS_WORD_DATA) { - data->word = readl(REG(i2c, RTL9300_I2C_DATA_WORD0)); - } else if (len > 0) { - rtl9300_i2c_read(i2c, &data->block[0], len); - } - } - - return 0; -} - -static int rtl9310_execute_xfer(struct rtl9300_i2c *i2c, char read_write, - int size, union i2c_smbus_data * data, int len) -{ - u32 v; - - if (read_write == I2C_SMBUS_READ) - REG_MASK(i2c, BIT(RTL9310_I2C_CTRL_RWOP), 0, RTL9310_I2C_CTRL); - else - REG_MASK(i2c, 0, BIT(RTL9310_I2C_CTRL_RWOP), RTL9310_I2C_CTRL); - - REG_MASK(i2c, 0, BIT(RTL9310_I2C_CTRL_I2C_TRIG), RTL9310_I2C_CTRL); - do { - v = readl(REG(i2c, RTL9310_I2C_CTRL)); - } while (v & BIT(RTL9310_I2C_CTRL_I2C_TRIG)); - - if (v & BIT(RTL9310_I2C_CTRL_I2C_FAIL)) - return -EIO; - - if (read_write == I2C_SMBUS_READ) { - if (size == I2C_SMBUS_BYTE || size == I2C_SMBUS_BYTE_DATA){ - data->byte = readl(REG(i2c, RTL9310_I2C_DATA)); - } else if (size == I2C_SMBUS_WORD_DATA) { - data->word = readl(REG(i2c, RTL9310_I2C_DATA)); - } else if (len > 0) { - rtl9310_i2c_read(i2c, &data->block[0], len); - } - } - - return 0; -} - -static int rtl9300_i2c_smbus_xfer(struct i2c_adapter * adap, u16 addr, - unsigned short flags, char read_write, - u8 command, int size, union i2c_smbus_data * data) -{ - struct rtl9300_i2c *i2c = i2c_get_adapdata(adap); - struct i2c_drv_data *drv_data = (struct i2c_drv_data *)device_get_match_data(i2c->dev); - int len = 0, ret; - - mutex_lock(&i2c_lock); - switch (size) { - case I2C_SMBUS_QUICK: - drv_data->config_xfer(i2c, addr, 0); - drv_data->reg_addr_set(i2c, 0, 0); - break; - - case I2C_SMBUS_BYTE: - if (read_write == I2C_SMBUS_WRITE) { - drv_data->config_xfer(i2c, addr, 0); - drv_data->reg_addr_set(i2c, command, 1); - } else { - drv_data->config_xfer(i2c, addr, 1); - drv_data->reg_addr_set(i2c, 0, 0); - } - break; - - case I2C_SMBUS_BYTE_DATA: - pr_debug("I2C_SMBUS_BYTE_DATA %02x, read %d cmd %02x\n", addr, read_write, command); - drv_data->reg_addr_set(i2c, command, 1); - drv_data->config_xfer(i2c, addr, 1); - - if (read_write == I2C_SMBUS_WRITE) { - pr_debug("--> data %02x\n", data->byte); - drv_data->writel(i2c, data->byte); - } - break; - - case I2C_SMBUS_WORD_DATA: - pr_debug("I2C_SMBUS_WORD %02x, read %d\n", addr, read_write); - drv_data->reg_addr_set(i2c, command, 1); - drv_data->config_xfer(i2c, addr, 2); - if (read_write == I2C_SMBUS_WRITE) - drv_data->writel(i2c, data->word); - break; - - case I2C_SMBUS_BLOCK_DATA: - pr_debug("I2C_SMBUS_BLOCK_DATA %02x, read %d, len %d\n", - addr, read_write, data->block[0]); - drv_data->reg_addr_set(i2c, command, 1); - drv_data->config_xfer(i2c, addr, data->block[0]); - if (read_write == I2C_SMBUS_WRITE) - drv_data->write(i2c, &data->block[1], data->block[0]); - len = data->block[0]; - break; - - default: - dev_warn(&adap->dev, "Unsupported transaction %d\n", size); - return -EOPNOTSUPP; - } - - ret = drv_data->execute_xfer(i2c, read_write, size, data, len); - - mutex_unlock(&i2c_lock); - - return ret; -} - -static u32 rtl9300_i2c_func(struct i2c_adapter *a) -{ - return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | - I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | - I2C_FUNC_SMBUS_BLOCK_DATA; -} - -static const struct i2c_algorithm rtl9300_i2c_algo = { - .smbus_xfer = rtl9300_i2c_smbus_xfer, - .functionality = rtl9300_i2c_func, -}; - -struct i2c_adapter_quirks rtl9300_i2c_quirks = { - .flags = I2C_AQ_NO_CLK_STRETCH, - .max_read_len = 16, - .max_write_len = 16, -}; - -static int rtl9300_i2c_probe(struct platform_device *pdev) -{ - struct resource *res; - struct rtl9300_i2c *i2c; - struct i2c_adapter *adap; - struct i2c_drv_data *drv_data; - struct device_node *node = pdev->dev.of_node; - u32 clock_freq, pin; - int ret = 0; - - pr_info("%s probing I2C adapter\n", __func__); - - if (!node) { - dev_err(i2c->dev, "No DT found\n"); - return -EINVAL; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - drv_data = (struct i2c_drv_data *) device_get_match_data(&pdev->dev); - - i2c = devm_kzalloc(&pdev->dev, sizeof(struct rtl9300_i2c), GFP_KERNEL); - if (!i2c) - return -ENOMEM; - - i2c->base = devm_ioremap_resource(&pdev->dev, res); - i2c->mst2_offset = drv_data->mst2_offset; - if (IS_ERR(i2c->base)) - return PTR_ERR(i2c->base); - - pr_debug("%s base memory %08x\n", __func__, (u32)i2c->base); - i2c->dev = &pdev->dev; - - if (of_property_read_u32(node, "clock-frequency", &clock_freq)) { - clock_freq = I2C_MAX_STANDARD_MODE_FREQ; - } - switch(clock_freq) { - case I2C_MAX_STANDARD_MODE_FREQ: - i2c->bus_freq = RTL9300_I2C_STD_FREQ; - break; - - case I2C_MAX_FAST_MODE_FREQ: - i2c->bus_freq = RTL9300_I2C_FAST_FREQ; - break; - default: - dev_warn(i2c->dev, "clock-frequency %d not supported\n", clock_freq); - return -EINVAL; - } - - dev_info(&pdev->dev, "SCL speed %d, mode is %d\n", clock_freq, i2c->bus_freq); - - if (of_property_read_u32(node, "scl-pin", &pin)) { - dev_warn(i2c->dev, "SCL pin not found in DT, using default\n"); - pin = drv_data->scl0_pin; - } - if (!(pin == drv_data->scl0_pin || pin == drv_data->scl1_pin)) { - dev_warn(i2c->dev, "SCL pin %d not supported\n", pin); - return -EINVAL; - } - i2c->scl_num = pin == drv_data->scl0_pin ? 0 : 1; - pr_info("%s scl_num %d\n", __func__, i2c->scl_num); - - if (of_property_read_u32(node, "sda-pin", &pin)) { - dev_warn(i2c->dev, "SDA pin not found in DT, using default \n"); - pin = drv_data->sda0_pin; - } - i2c->sda_num = pin - drv_data->sda0_pin; - if (i2c->sda_num < 0 || i2c->sda_num > 7) { - dev_warn(i2c->dev, "SDA pin %d not supported\n", pin); - return -EINVAL; - } - pr_info("%s sda_num %d\n", __func__, i2c->sda_num); - - adap = &i2c->adap; - adap->owner = THIS_MODULE; - adap->algo = &rtl9300_i2c_algo; - adap->retries = 3; - adap->dev.parent = &pdev->dev; - i2c_set_adapdata(adap, i2c); - adap->dev.of_node = node; - strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name)); - - platform_set_drvdata(pdev, i2c); - - drv_data->config_io(i2c, i2c->scl_num, i2c->sda_num); - - ret = i2c_add_adapter(adap); - - return ret; -} - -static int rtl9300_i2c_remove(struct platform_device *pdev) -{ - struct rtl9300_i2c *i2c = platform_get_drvdata(pdev); - - i2c_del_adapter(&i2c->adap); - - return 0; -} - -struct i2c_drv_data rtl9300_i2c_drv_data = { - .scl0_pin = 8, - .scl1_pin = 17, - .sda0_pin = 9, - .read = rtl9300_i2c_read, - .read = rtl9300_i2c_write, - .reg_addr_set = rtl9300_i2c_reg_addr_set, - .config_xfer = rtl9300_i2c_config_xfer, - .execute_xfer = rtl9300_execute_xfer, - .writel = rtl9300_writel, - .config_io = rtl9300_i2c_config_io, - .mst2_offset = 0x1c, -}; - -struct i2c_drv_data rtl9310_i2c_drv_data = { - .scl0_pin = 13, - .scl1_pin = 14, - .sda0_pin = 0, - .read = rtl9310_i2c_read, - .read = rtl9310_i2c_write, - .reg_addr_set = rtl9310_i2c_reg_addr_set, - .config_xfer = rtl9310_i2c_config_xfer, - .execute_xfer = rtl9310_execute_xfer, - .writel = rtl9310_writel, - .config_io = rtl9310_i2c_config_io, - .mst2_offset = 0x18, -}; - -static const struct of_device_id i2c_rtl9300_dt_ids[] = { - { .compatible = "realtek,rtl9300-i2c", .data = (void *) &rtl9300_i2c_drv_data }, - { .compatible = "realtek,rtl9310-i2c", .data = (void *) &rtl9310_i2c_drv_data }, - { /* sentinel */ } -}; -MODULE_DEVICE_TABLE(of, rtl838x_eth_of_ids); - -static struct platform_driver rtl9300_i2c_driver = { - .probe = rtl9300_i2c_probe, - .remove = rtl9300_i2c_remove, - .driver = { - .name = "i2c-rtl9300", - .pm = NULL, - .of_match_table = i2c_rtl9300_dt_ids, - }, -}; - -module_platform_driver(rtl9300_i2c_driver); - -MODULE_AUTHOR("Birger Koblitz"); -MODULE_DESCRIPTION("RTL9300 I2C host driver"); -MODULE_LICENSE("GPL v2"); |