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path: root/drivers/i2c/busses/i2c-mpc.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-mpc.c')
-rw-r--r--drivers/i2c/busses/i2c-mpc.c93
1 files changed, 59 insertions, 34 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index ca86430cb4a..6a32aa095f8 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -16,11 +16,12 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
-#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/of_platform.h>
-#include <linux/of_i2c.h>
#include <linux/slab.h>
+#include <linux/clk.h>
#include <linux/io.h>
#include <linux/fsl_devices.h>
#include <linux/i2c.h>
@@ -64,9 +65,10 @@ struct mpc_i2c {
struct i2c_adapter adap;
int irq;
u32 real_clk;
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
u8 fdr, dfsrr;
#endif
+ struct clk *clk_per;
};
struct mpc_i2c_divider {
@@ -113,7 +115,7 @@ static void mpc_i2c_fixup(struct mpc_i2c *i2c)
for (k = 9; k; k--) {
writeccr(i2c, 0);
writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN);
- udelay(delay_val);
+ readb(i2c->base + MPC_I2C_DR);
writeccr(i2c, CCR_MEN);
udelay(delay_val << 1);
}
@@ -175,7 +177,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
}
#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
-static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] __devinitconst = {
+static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
{36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
@@ -196,7 +198,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] __devinitconst = {
{10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
};
-static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
+static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
int prescaler, u32 *real_clk)
{
const struct mpc_i2c_divider *div = NULL;
@@ -230,7 +232,7 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
return (int)div->fdr;
}
-static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+static void mpc_i2c_setup_52xx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -252,7 +254,7 @@ static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
fdr);
}
#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
-static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+static void mpc_i2c_setup_52xx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -260,7 +262,7 @@ static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
#ifdef CONFIG_PPC_MPC512x
-static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+static void mpc_i2c_setup_512x(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -288,7 +290,7 @@ static void __devinit mpc_i2c_setup_512x(struct device_node *node,
mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
}
#else /* CONFIG_PPC_MPC512x */
-static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+static void mpc_i2c_setup_512x(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -296,7 +298,7 @@ static void __devinit mpc_i2c_setup_512x(struct device_node *node,
#endif /* CONFIG_PPC_MPC512x */
#ifdef CONFIG_FSL_SOC
-static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] __devinitconst = {
+static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
{160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
{288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
{416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
@@ -316,7 +318,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] __devinitconst = {
{49152, 0x011e}, {61440, 0x011f}
};
-static u32 __devinit mpc_i2c_get_sec_cfg_8xxx(void)
+static u32 mpc_i2c_get_sec_cfg_8xxx(void)
{
struct device_node *node = NULL;
u32 __iomem *reg;
@@ -345,7 +347,7 @@ static u32 __devinit mpc_i2c_get_sec_cfg_8xxx(void)
return val;
}
-static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
+static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
u32 prescaler, u32 *real_clk)
{
const struct mpc_i2c_divider *div = NULL;
@@ -383,7 +385,7 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
return div ? (int)div->fdr : -EINVAL;
}
-static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+static void mpc_i2c_setup_8xxx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -408,7 +410,7 @@ static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
}
#else /* !CONFIG_FSL_SOC */
-static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+static void mpc_i2c_setup_8xxx(struct device_node *node,
struct mpc_i2c *i2c,
u32 clock, u32 prescaler)
{
@@ -609,13 +611,12 @@ static const struct i2c_algorithm mpc_algo = {
static struct i2c_adapter mpc_ops = {
.owner = THIS_MODULE,
- .name = "MPC adapter",
.algo = &mpc_algo,
.timeout = HZ,
};
static const struct of_device_id mpc_i2c_of_match[];
-static int __devinit fsl_i2c_probe(struct platform_device *op)
+static int fsl_i2c_probe(struct platform_device *op)
{
const struct of_device_id *match;
struct mpc_i2c *i2c;
@@ -623,6 +624,9 @@ static int __devinit fsl_i2c_probe(struct platform_device *op)
u32 clock = MPC_I2C_CLOCK_LEGACY;
int result = 0;
int plen;
+ struct resource res;
+ struct clk *clk;
+ int err;
match = of_match_device(mpc_i2c_of_match, &op->dev);
if (!match)
@@ -653,6 +657,21 @@ static int __devinit fsl_i2c_probe(struct platform_device *op)
}
}
+ /*
+ * enable clock for the I2C peripheral (non fatal),
+ * keep a reference upon successful allocation
+ */
+ clk = devm_clk_get(&op->dev, NULL);
+ if (!IS_ERR(clk)) {
+ err = clk_prepare_enable(clk);
+ if (err) {
+ dev_err(&op->dev, "failed to enable clock\n");
+ goto fail_request;
+ } else {
+ i2c->clk_per = clk;
+ }
+ }
+
if (of_get_property(op->dev.of_node, "fsl,preserve-clocking", NULL)) {
clock = MPC_I2C_CLOCK_PRESERVE;
} else {
@@ -679,9 +698,12 @@ static int __devinit fsl_i2c_probe(struct platform_device *op)
}
dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ);
- dev_set_drvdata(&op->dev, i2c);
+ platform_set_drvdata(op, i2c);
i2c->adap = mpc_ops;
+ of_address_to_resource(op->dev.of_node, 0, &res);
+ scnprintf(i2c->adap.name, sizeof(i2c->adap.name),
+ "MPC adapter at 0x%llx", (unsigned long long)res.start);
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &op->dev;
i2c->adap.dev.of_node = of_node_get(op->dev.of_node);
@@ -691,12 +713,12 @@ static int __devinit fsl_i2c_probe(struct platform_device *op)
dev_err(i2c->dev, "failed to add adapter\n");
goto fail_add;
}
- of_i2c_register_devices(&i2c->adap);
return result;
fail_add:
- dev_set_drvdata(&op->dev, NULL);
+ if (i2c->clk_per)
+ clk_disable_unprepare(i2c->clk_per);
free_irq(i2c->irq, i2c);
fail_request:
irq_dispose_mapping(i2c->irq);
@@ -706,12 +728,14 @@ static int __devinit fsl_i2c_probe(struct platform_device *op)
return result;
};
-static int __devexit fsl_i2c_remove(struct platform_device *op)
+static int fsl_i2c_remove(struct platform_device *op)
{
- struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
+ struct mpc_i2c *i2c = platform_get_drvdata(op);
i2c_del_adapter(&i2c->adap);
- dev_set_drvdata(&op->dev, NULL);
+
+ if (i2c->clk_per)
+ clk_disable_unprepare(i2c->clk_per);
if (i2c->irq)
free_irq(i2c->irq, i2c);
@@ -722,7 +746,7 @@ static int __devexit fsl_i2c_remove(struct platform_device *op)
return 0;
};
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
static int mpc_i2c_suspend(struct device *dev)
{
struct mpc_i2c *i2c = dev_get_drvdata(dev);
@@ -743,27 +767,30 @@ static int mpc_i2c_resume(struct device *dev)
return 0;
}
-SIMPLE_DEV_PM_OPS(mpc_i2c_pm_ops, mpc_i2c_suspend, mpc_i2c_resume);
+static SIMPLE_DEV_PM_OPS(mpc_i2c_pm_ops, mpc_i2c_suspend, mpc_i2c_resume);
+#define MPC_I2C_PM_OPS (&mpc_i2c_pm_ops)
+#else
+#define MPC_I2C_PM_OPS NULL
#endif
-static const struct mpc_i2c_data mpc_i2c_data_512x __devinitdata = {
+static const struct mpc_i2c_data mpc_i2c_data_512x = {
.setup = mpc_i2c_setup_512x,
};
-static const struct mpc_i2c_data mpc_i2c_data_52xx __devinitdata = {
+static const struct mpc_i2c_data mpc_i2c_data_52xx = {
.setup = mpc_i2c_setup_52xx,
};
-static const struct mpc_i2c_data mpc_i2c_data_8313 __devinitdata = {
+static const struct mpc_i2c_data mpc_i2c_data_8313 = {
.setup = mpc_i2c_setup_8xxx,
};
-static const struct mpc_i2c_data mpc_i2c_data_8543 __devinitdata = {
+static const struct mpc_i2c_data mpc_i2c_data_8543 = {
.setup = mpc_i2c_setup_8xxx,
.prescaler = 2,
};
-static const struct mpc_i2c_data mpc_i2c_data_8544 __devinitdata = {
+static const struct mpc_i2c_data mpc_i2c_data_8544 = {
.setup = mpc_i2c_setup_8xxx,
.prescaler = 3,
};
@@ -785,14 +812,12 @@ MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
/* Structure for a device driver */
static struct platform_driver mpc_i2c_driver = {
.probe = fsl_i2c_probe,
- .remove = __devexit_p(fsl_i2c_remove),
+ .remove = fsl_i2c_remove,
.driver = {
.owner = THIS_MODULE,
.name = DRV_NAME,
.of_match_table = mpc_i2c_of_match,
-#ifdef CONFIG_PM
- .pm = &mpc_i2c_pm_ops,
-#endif
+ .pm = MPC_I2C_PM_OPS,
},
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 20:06:00 +0000