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path: root/drivers/i2c/busses/i2c-designware-common.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-designware-common.c')
-rw-r--r--drivers/i2c/busses/i2c-designware-common.c180
1 files changed, 170 insertions, 10 deletions
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index e8a688d04aee..080204182bb5 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -20,12 +20,17 @@
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/swab.h>
#include <linux/types.h>
#include <linux/units.h>
+#define DEFAULT_SYMBOL_NAMESPACE I2C_DW_COMMON
+
#include "i2c-designware-core.h"
static char *abort_sources[] = {
@@ -188,7 +193,7 @@ static const u32 supported_speeds[] = {
I2C_MAX_STANDARD_MODE_FREQ,
};
-int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
+static int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
{
struct i2c_timings *t = &dev->timings;
unsigned int i;
@@ -208,7 +213,44 @@ int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
return -EINVAL;
}
-EXPORT_SYMBOL_GPL(i2c_dw_validate_speed);
+
+#ifdef CONFIG_OF
+
+#include <linux/platform_device.h>
+
+#define MSCC_ICPU_CFG_TWI_DELAY 0x0
+#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE BIT(0)
+#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER 0x4
+
+static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
+{
+ writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
+ dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
+
+ return 0;
+}
+
+static void i2c_dw_of_configure(struct device *device)
+{
+ struct platform_device *pdev = to_platform_device(device);
+ struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+ switch (dev->flags & MODEL_MASK) {
+ case MODEL_MSCC_OCELOT:
+ dev->ext = devm_platform_ioremap_resource(pdev, 1);
+ if (!IS_ERR(dev->ext))
+ dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
+ break;
+ default:
+ break;
+ }
+}
+
+#else /* CONFIG_OF */
+
+static inline void i2c_dw_of_configure(struct device *device) { }
+
+#endif /* CONFIG_OF */
#ifdef CONFIG_ACPI
@@ -255,7 +297,7 @@ static void i2c_dw_acpi_params(struct device *device, char method[],
kfree(buf.pointer);
}
-int i2c_dw_acpi_configure(struct device *device)
+static void i2c_dw_acpi_configure(struct device *device)
{
struct dw_i2c_dev *dev = dev_get_drvdata(device);
struct i2c_timings *t = &dev->timings;
@@ -285,10 +327,7 @@ int i2c_dw_acpi_configure(struct device *device)
dev->sda_hold_time = fs_ht;
break;
}
-
- return 0;
}
-EXPORT_SYMBOL_GPL(i2c_dw_acpi_configure);
static u32 i2c_dw_acpi_round_bus_speed(struct device *device)
{
@@ -310,11 +349,13 @@ static u32 i2c_dw_acpi_round_bus_speed(struct device *device)
#else /* CONFIG_ACPI */
+static inline void i2c_dw_acpi_configure(struct device *device) { }
+
static inline u32 i2c_dw_acpi_round_bus_speed(struct device *device) { return 0; }
#endif /* CONFIG_ACPI */
-void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
+static void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
{
u32 acpi_speed = i2c_dw_acpi_round_bus_speed(dev->dev);
struct i2c_timings *t = &dev->timings;
@@ -330,10 +371,47 @@ void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
else
t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
}
-EXPORT_SYMBOL_GPL(i2c_dw_adjust_bus_speed);
-u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
+int i2c_dw_fw_parse_and_configure(struct dw_i2c_dev *dev)
+{
+ struct i2c_timings *t = &dev->timings;
+ struct device *device = dev->dev;
+ struct fwnode_handle *fwnode = dev_fwnode(device);
+
+ i2c_parse_fw_timings(device, t, false);
+
+ i2c_dw_adjust_bus_speed(dev);
+
+ if (is_of_node(fwnode))
+ i2c_dw_of_configure(device);
+ else if (is_acpi_node(fwnode))
+ i2c_dw_acpi_configure(device);
+
+ return i2c_dw_validate_speed(dev);
+}
+EXPORT_SYMBOL_GPL(i2c_dw_fw_parse_and_configure);
+
+static u32 i2c_dw_read_scl_reg(struct dw_i2c_dev *dev, u32 reg)
+{
+ u32 val;
+ int ret;
+
+ ret = i2c_dw_acquire_lock(dev);
+ if (ret)
+ return 0;
+
+ ret = regmap_read(dev->map, reg, &val);
+ i2c_dw_release_lock(dev);
+
+ return ret ? 0 : val;
+}
+
+u32 i2c_dw_scl_hcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
+ u32 tSYMBOL, u32 tf, int cond, int offset)
{
+ if (!ic_clk)
+ return i2c_dw_read_scl_reg(dev, reg);
+
/*
* DesignWare I2C core doesn't seem to have solid strategy to meet
* the tHD;STA timing spec. Configuring _HCNT based on tHIGH spec
@@ -372,8 +450,12 @@ u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
3 + offset;
}
-u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
+u32 i2c_dw_scl_lcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
+ u32 tLOW, u32 tf, int offset)
{
+ if (!ic_clk)
+ return i2c_dw_read_scl_reg(dev, reg);
+
/*
* Conditional expression:
*
@@ -653,6 +735,84 @@ void i2c_dw_disable(struct dw_i2c_dev *dev)
i2c_dw_release_lock(dev);
}
+EXPORT_SYMBOL_GPL(i2c_dw_disable);
+
+int i2c_dw_probe(struct dw_i2c_dev *dev)
+{
+ device_set_node(&dev->adapter.dev, dev_fwnode(dev->dev));
+
+ switch (dev->mode) {
+ case DW_IC_SLAVE:
+ return i2c_dw_probe_slave(dev);
+ case DW_IC_MASTER:
+ return i2c_dw_probe_master(dev);
+ default:
+ dev_err(dev->dev, "Wrong operation mode: %d\n", dev->mode);
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL_GPL(i2c_dw_probe);
+
+static int i2c_dw_prepare(struct device *device)
+{
+ /*
+ * If the ACPI companion device object is present for this device,
+ * it may be accessed during suspend and resume of other devices via
+ * I2C operation regions, so tell the PM core and middle layers to
+ * avoid skipping system suspend/resume callbacks for it in that case.
+ */
+ return !has_acpi_companion(device);
+}
+
+static int i2c_dw_runtime_suspend(struct device *device)
+{
+ struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+ if (dev->shared_with_punit)
+ return 0;
+
+ i2c_dw_disable(dev);
+ i2c_dw_prepare_clk(dev, false);
+
+ return 0;
+}
+
+static int i2c_dw_suspend(struct device *device)
+{
+ struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+ i2c_mark_adapter_suspended(&dev->adapter);
+
+ return i2c_dw_runtime_suspend(device);
+}
+
+static int i2c_dw_runtime_resume(struct device *device)
+{
+ struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+ if (!dev->shared_with_punit)
+ i2c_dw_prepare_clk(dev, true);
+
+ dev->init(dev);
+
+ return 0;
+}
+
+static int i2c_dw_resume(struct device *device)
+{
+ struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+ i2c_dw_runtime_resume(device);
+ i2c_mark_adapter_resumed(&dev->adapter);
+
+ return 0;
+}
+
+EXPORT_GPL_DEV_PM_OPS(i2c_dw_dev_pm_ops) = {
+ .prepare = pm_sleep_ptr(i2c_dw_prepare),
+ LATE_SYSTEM_SLEEP_PM_OPS(i2c_dw_suspend, i2c_dw_resume)
+ RUNTIME_PM_OPS(i2c_dw_runtime_suspend, i2c_dw_runtime_resume, NULL)
+};
MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter core");
MODULE_LICENSE("GPL");