+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-
-#include <linux/module.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.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)
-{
- if (len > 16)
- return -EIO;
-
- for (int i = 0; i < len; i++) {
- u32 v;
-
- 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)
-{
- if (len > 16)
- return -EIO;
-
- for (int i = 0; i < len; i++) {
- u32 v;
-
- 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 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;
- }
-
- 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_platform_ioremap_resource(pdev, 0);
- 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;
- strscpy(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 void rtl9300_i2c_remove(struct platform_device *pdev)
-{
- struct rtl9300_i2c *i2c = platform_get_drvdata(pdev);
-
- i2c_del_adapter(&i2c->adap);
-}
-
-struct i2c_drv_data rtl9300_i2c_drv_data = {
- .scl0_pin = 8,
- .scl1_pin = 17,
- .sda0_pin = 9,
- .read = rtl9300_i2c_read,
- .write = 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 = 15,
- .read = rtl9310_i2c_read,
- .write = 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");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * I2C multiplexer for the 2 I2C Masters of the RTL9300
- * with up to 8 channels each, but which are not entirely
- * independent of each other
- */
-#include <linux/i2c-mux.h>
-#include <linux/module.h>
-#include <linux/mux/consumer.h>
-#include <linux/of_device.h>
-#include <linux/of_address.h>
-#include <linux/platform_device.h>
-
-#include "../busses/i2c-rtl9300.h"
-
-#define NUM_MASTERS 2
-#define NUM_BUSSES 8
-
-#define REG(mst, x) (mux->base + x + (mst ? mux->i2c->mst2_offset : 0))
-#define REG_MASK(mst, clear, set, reg) \
- writel((readl(REG((mst),(reg))) & ~(clear)) | (set), REG((mst),(reg)))
-
-struct channel {
- u8 sda_num;
- u8 scl_num;
-};
-
-static struct channel channels[NUM_MASTERS * NUM_BUSSES];
-
-struct rtl9300_mux {
- void __iomem *base;
- struct device *dev;
- struct i2c_adapter *parent;
- struct rtl9300_i2c * i2c;
-};
-
-struct i2c_mux_data {
- int scl0_pin;
- int scl1_pin;
- int sda0_pin;
- int sda_pins;
- int (*i2c_mux_select)(struct i2c_mux_core *muxc, u32 chan);
- int (*i2c_mux_deselect)(struct i2c_mux_core *muxc, u32 chan);
- void (*sda_sel)(struct i2c_mux_core *muxc, int pin);
-};
-
-static int rtl9300_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
-{
- struct rtl9300_mux *mux = i2c_mux_priv(muxc);
-
- /* Set SCL pin */
- REG_MASK(channels[chan].scl_num, 0,
- BIT(RTL9300_I2C_CTRL1_GPIO8_SCL_SEL), RTL9300_I2C_CTRL1);
-
- /* Set SDA pin */
- REG_MASK(channels[chan].scl_num, 0x7 << RTL9300_I2C_CTRL1_SDA_OUT_SEL,
- channels[chan].sda_num << RTL9300_I2C_CTRL1_SDA_OUT_SEL, RTL9300_I2C_CTRL1);
-
- mux->i2c->sda_num = channels[chan].sda_num;
- mux->i2c->scl_num = channels[chan].scl_num;
-
- return 0;
-}
-
-static int rtl9310_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
-{
- struct rtl9300_mux *mux = i2c_mux_priv(muxc);
-
- /* Set SCL pin */
- REG_MASK(0, 0, BIT(RTL9310_I2C_MST_IF_SEL_GPIO_SCL_SEL + channels[chan].scl_num),
- RTL9310_I2C_MST_IF_SEL);
-
- /* Set SDA pin */
- REG_MASK(channels[chan].scl_num, 0xf << RTL9310_I2C_CTRL_SDA_OUT_SEL,
- channels[chan].sda_num << RTL9310_I2C_CTRL_SDA_OUT_SEL, RTL9310_I2C_CTRL);
-
- mux->i2c->sda_num = channels[chan].sda_num;
- mux->i2c->scl_num = channels[chan].scl_num;
-
- return 0;
-}
-
-static int rtl9300_i2c_mux_deselect(struct i2c_mux_core *muxc, u32 chan)
-{
- return 0;
-}
-
-static void rtl9300_sda_sel(struct i2c_mux_core *muxc, int pin)
-{
- struct rtl9300_mux *mux = i2c_mux_priv(muxc);
- u32 v;
-
- /* Set SDA pin to I2C functionality */
- v = readl(REG(0, RTL9300_I2C_MST_GLB_CTRL));
- v |= BIT(pin);
- writel(v, REG(0, RTL9300_I2C_MST_GLB_CTRL));
-}
-
-static void rtl9310_sda_sel(struct i2c_mux_core *muxc, int pin)
-{
- struct rtl9300_mux *mux = i2c_mux_priv(muxc);
- u32 v;
-
- /* Set SDA pin to I2C functionality */
- v = readl(REG(0, RTL9310_I2C_MST_IF_SEL));
- v |= BIT(pin);
- writel(v, REG(0, RTL9310_I2C_MST_IF_SEL));
-}
-
-static struct device_node *mux_parent_adapter(struct device *dev, struct rtl9300_mux *mux)
-{
- struct device_node *node = dev->of_node;
- struct device_node *parent_np;
- struct i2c_adapter *parent;
-
- parent_np = of_parse_phandle(node, "i2c-parent", 0);
- if (!parent_np) {
- dev_err(dev, "Cannot parse i2c-parent\n");
- return ERR_PTR(-ENODEV);
- }
- parent = of_find_i2c_adapter_by_node(parent_np);
- of_node_put(parent_np);
- if (!parent)
- return ERR_PTR(-EPROBE_DEFER);
-
- if (!(of_device_is_compatible(parent_np, "realtek,rtl9300-i2c") ||
- of_device_is_compatible(parent_np, "realtek,rtl9310-i2c"))){
- dev_err(dev, "I2C parent not an RTL9300 I2C controller\n");
- return ERR_PTR(-ENODEV);
- }
-
- mux->parent = parent;
- mux->i2c = (struct rtl9300_i2c *)i2c_get_adapdata(parent);
- mux->base = mux->i2c->base;
-
- return parent_np;
-}
-
-struct i2c_mux_data rtl9300_i2c_mux_data = {
- .scl0_pin = 8,
- .scl1_pin = 17,
- .sda0_pin = 9,
- .sda_pins = 8,
- .i2c_mux_select = rtl9300_i2c_mux_select,
- .i2c_mux_deselect = rtl9300_i2c_mux_deselect,
- .sda_sel = rtl9300_sda_sel,
-};
-
-struct i2c_mux_data rtl9310_i2c_mux_data = {
- .scl0_pin = 13,
- .scl1_pin = 14,
- .sda0_pin = 15,
- .sda_pins = 16,
- .i2c_mux_select = rtl9310_i2c_mux_select,
- .i2c_mux_deselect = rtl9300_i2c_mux_deselect,
- .sda_sel = rtl9310_sda_sel,
-};
-
-static const struct of_device_id rtl9300_i2c_mux_of_match[] = {
- { .compatible = "realtek,i2c-mux-rtl9300", .data = (void *) &rtl9300_i2c_mux_data},
- { .compatible = "realtek,i2c-mux-rtl9310", .data = (void *) &rtl9310_i2c_mux_data},
- {},
-};
-
-MODULE_DEVICE_TABLE(of, rtl9300_i2c_mux_of_match);
-
-static int rtl9300_i2c_mux_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node;
- struct device_node *parent_np;
- struct device_node *child;
- struct i2c_mux_core *muxc;
- struct rtl9300_mux *mux;
- struct i2c_mux_data *mux_data;
- int children;
- int ret;
-
- pr_info("%s probing I2C adapter\n", __func__);
-
- if (!node) {
- dev_err(dev, "No DT found\n");
- return -EINVAL;
- }
-
- mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
- if (!mux)
- return -ENOMEM;
-
- mux->dev = dev;
-
- mux_data = (struct i2c_mux_data *) device_get_match_data(dev);
-
- parent_np = mux_parent_adapter(dev, mux);
- if (IS_ERR(parent_np))
- return dev_err_probe(dev, PTR_ERR(parent_np), "i2c-parent adapter not found\n");
-
- pr_info("%s base memory %08x\n", __func__, (u32)mux->base);
-
- children = of_get_child_count(node);
-
- muxc = i2c_mux_alloc(mux->parent, dev, children, 0, 0,
- mux_data->i2c_mux_select, mux_data->i2c_mux_deselect);
- if (!muxc) {
- ret = -ENOMEM;
- goto err_parent;
- }
- muxc->priv = mux;
-
- platform_set_drvdata(pdev, muxc);
-
- for_each_child_of_node(node, child) {
- u32 chan;
- u32 pin;
-
- ret = of_property_read_u32(child, "reg", &chan);
- if (ret < 0) {
- dev_err(dev, "no reg property for node '%pOFn'\n",
- child);
- goto err_children;
- }
-
- if (chan >= NUM_MASTERS * NUM_BUSSES) {
- dev_err(dev, "invalid reg %u\n", chan);
- ret = -EINVAL;
- goto err_children;
- }
-
- if (of_property_read_u32(child, "scl-pin", &pin)) {
- dev_warn(dev, "SCL pin not found in DT, using default\n");
- pin = mux_data->scl0_pin;
- }
- if (!(pin == mux_data->scl0_pin || pin == mux_data->scl1_pin)) {
- dev_warn(dev, "SCL pin %d not supported\n", pin);
- ret = -EINVAL;
- goto err_children;
- }
- channels[chan].scl_num = pin == mux_data->scl0_pin ? 0 : 1;
- pr_info("%s channel %d scl_num %d\n", __func__, chan, channels[chan].scl_num);
-
- if (of_property_read_u32(child, "sda-pin", &pin)) {
- dev_warn(dev, "SDA pin not found in DT, using default \n");
- pin = mux_data->sda0_pin;
- }
- channels[chan].sda_num = pin - mux_data->sda0_pin;
- if (channels[chan].sda_num < 0 || channels[chan].sda_num >= mux_data->sda_pins) {
- dev_warn(dev, "SDA pin %d not supported\n", pin);
- return -EINVAL;
- }
- pr_info("%s channel %d sda_num %d\n", __func__, chan, channels[chan].sda_num);
-
- mux_data->sda_sel(muxc, channels[chan].sda_num);
-
- ret = i2c_mux_add_adapter(muxc, 0, chan);
- if (ret)
- goto err_children;
- }
-
- dev_info(dev, "%d-port mux on %s adapter\n", children, mux->parent->name);
-
- return 0;
-
-err_children:
- i2c_mux_del_adapters(muxc);
-err_parent:
- i2c_put_adapter(mux->parent);
-
- return ret;
-}
-
-static void rtl9300_i2c_mux_remove(struct platform_device *pdev)
-{
- struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
-
- i2c_mux_del_adapters(muxc);
- i2c_put_adapter(muxc->parent);
-}
-
-static struct platform_driver i2c_mux_driver = {
- .probe = rtl9300_i2c_mux_probe,
- .remove = rtl9300_i2c_mux_remove,
- .driver = {
- .name = "i2c-mux-rtl9300",
- .of_match_table = rtl9300_i2c_mux_of_match,
- },
-};
-module_platform_driver(i2c_mux_driver);
-
-MODULE_DESCRIPTION("RTL9300 I2C multiplexer driver");
-MODULE_AUTHOR("Birger Koblitz");
-MODULE_LICENSE("GPL v2");
projects / thirdparty / openwrt.git / commitdiff
