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path: root/target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c
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Diffstat (limited to 'target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c')
-rw-r--r--target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c293
1 files changed, 0 insertions, 293 deletions
diff --git a/target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c b/target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c
deleted file mode 100644
index 2f45b0a3cc..0000000000
--- a/target/linux/realtek/files-5.10/drivers/i2c/muxes/i2c-mux-rtl9300.c
+++ /dev/null
@@ -1,293 +0,0 @@
-// 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 = 0,
- .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, 0);
- 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 int 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);
-
- return 0;
-}
-
-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");
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