[U-Boot] [PATCH] RFC: samsung: i2c: Enable new CONFIG_SYS_I2C framework

Naveen Krishna Chatradhi
2013-09-30T06:58:10Z

This enables CONFIG_SYS_I2C on Samsung, updating existing s3c24x0
i2c driver to support this.

Note: Not for merge, Just for review and suggestions.

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
---
drivers/i2c/Makefile | 2 +-
drivers/i2c/s3c24x0_i2c.c | 156 +++++++++++++++++++++++++++++++--------------
2 files changed, 108 insertions(+), 50 deletions(-)

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 37ccbd1..96448a6 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -20,7 +20,7 @@ COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o
COBJS-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o
-COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
+COBJS-$(CONFIG_SYS_I2C_S3C24X0_I2C) += s3c24x0_i2c.o
COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
index 604d43d..89cb2d2 100644
--- a/drivers/i2c/s3c24x0_i2c.c
+++ b/drivers/i2c/s3c24x0_i2c.c
@@ -117,6 +117,8 @@

#define HSI2C_TIMEOUT_US 100000 /* 100 ms, finer granularity */

+DECLARE_GLOBAL_DATA_PTR;
+
/*
* For SPL boot some boards need i2c before SDRAM is initialised so force
* variables to live in SRAM
@@ -126,6 +128,9 @@ static unsigned int g_current_bus __attribute__((section(".data")));
static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM]
__attribute__((section(".data")));
#endif
+static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd);
+static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *);
+static void hsi2c_ch_init(struct s3c24x0_i2c_bus *);

/**
* Get a pointer to the given bus index
@@ -133,20 +138,40 @@ static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM]
* @bus_idx: Bus index to look up
* @return pointer to bus, or NULL if invalid or not available
*/
-static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx)
+static struct s3c24x0_i2c_bus *s3c_i2c_get_bus(struct i2c_adapter *adap)
{
- if (bus_idx < ARRAY_SIZE(i2c_bus)) {
- struct s3c24x0_i2c_bus *bus;
+ struct s3c24x0_i2c_bus *bus;

- bus = &i2c_bus[bus_idx];
- if (bus->active)
- return bus;
- }
+ bus = &i2c_bus[adap->hwadapnr];
+ if (bus->active)
+ return bus;

- debug("Undefined bus: %d\n", bus_idx);
+ debug("Undefined bus: %d\n", adap->hwadapnr);
return NULL;
}

+static unsigned int s3c_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int speed)
+{
+ struct s3c24x0_i2c_bus *i2c_bus;
+
+ i2c_bus = s3c_i2c_get_bus(adap);
+ if (!i2c_bus)
+ return -1;
+ i2c_bus->clock_frequency = speed;
+
+ if (i2c_bus->is_highspeed) {
+ if (hsi2c_get_clk_details(i2c_bus))
+ return -1;
+ hsi2c_ch_init(i2c_bus);
+ } else {
+ i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency,
+ CONFIG_SYS_I2C_SLAVE);
+ }
+
+ return 0;
+}
+
#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
static int GetI2CSDA(void)
{
@@ -392,39 +417,7 @@ static void exynos5_i2c_reset(struct s3c24x0_i2c_bus *i2c_bus)
hsi2c_ch_init(i2c_bus);
}

-/*
- * MULTI BUS I2C support
- */
-
-#ifdef CONFIG_I2C_MULTI_BUS
-int i2c_set_bus_num(unsigned int bus)
-{
- struct s3c24x0_i2c_bus *i2c_bus;
-
- i2c_bus = get_bus(bus);
- if (!i2c_bus)
- return -1;
- g_current_bus = bus;
-
- if (i2c_bus->is_highspeed) {
- if (hsi2c_get_clk_details(i2c_bus))
- return -1;
- hsi2c_ch_init(i2c_bus);
- } else {
- i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency,
- CONFIG_SYS_I2C_SLAVE);
- }
-
- return 0;
-}
-
-unsigned int i2c_get_bus_num(void)
-{
- return g_current_bus;
-}
-#endif
-
-void i2c_init(int speed, int slaveadd)
+static void s3c_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
struct s3c24x0_i2c *i2c;
#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
@@ -493,9 +486,15 @@ void i2c_init(int speed, int slaveadd)
#endif
}
#endif /* #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) */
- i2c_ch_init(i2c, speed, slaveadd);
+ /* This will override the speed selected in the fdt for that port */
+ debug("i2c_init(speed=%u, slaveaddr=0x%x)\n", speed, slaveaddr);
+ i2c_ch_init(i2c_bus->regs, speed, slaveaddr);
}

+static void exynos_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
+{
+ i2c_set_bus_speed(speed);
+}
/*
* Poll the appropriate bit of the fifo status register until the interface is
* ready to process the next byte or timeout expires.
@@ -829,13 +828,13 @@ bailout:
return result;
}

-int i2c_probe(uchar chip)
+int s3c_i2c_probe(struct i2c_adapter *adap, uchar chip)
{
struct s3c24x0_i2c_bus *i2c_bus;
uchar buf[1];
int ret;

- i2c_bus = get_bus(g_current_bus);
+ i2c_bus = s3c_i2c_get_bus(adap);
if (!i2c_bus)
return -1;
buf[0] = 0;
@@ -857,7 +856,8 @@ int i2c_probe(uchar chip)
return ret != I2C_OK;
}

-int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+int s3c_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, int alen,
+ uchar *buffer, int len)
{
struct s3c24x0_i2c_bus *i2c_bus;
uchar xaddr[4];
@@ -891,7 +891,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
- i2c_bus = get_bus(g_current_bus);
+ i2c_bus = s3c_i2c_get_bus(adap);
if (!i2c_bus)
return -1;

@@ -911,7 +911,8 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
return 0;
}

-int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+int s3c_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, int alen,
+ uchar *buffer, int len)
{
struct s3c24x0_i2c_bus *i2c_bus;
uchar xaddr[4];
@@ -944,7 +945,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
- i2c_bus = get_bus(g_current_bus);
+ i2c_bus = s3c_i2c_get_bus(adap);
if (!i2c_bus)
return -1;

@@ -1000,6 +1001,25 @@ static void process_nodes(const void *blob, int node_list[], int count,
node_list[i] = -1;
}
}
+void i2c_init_board()
+{
+ int node_list[CONFIG_MAX_I2C_NUM];
+ const void *blob = gd->fdt_blob;
+ int count;
+
+ /* First get the normal i2c ports */
+ count = fdtdec_find_aliases_for_id(blob, "i2c",
+ COMPAT_SAMSUNG_S3C2440_I2C, node_list,
+ CONFIG_MAX_I2C_NUM);
+ process_nodes(blob, node_list, count, 0);
+
+ /* Now look for high speed i2c ports */
+ count = fdtdec_find_aliases_for_id(blob, "i2c",
+ COMPAT_SAMSUNG_EXYNOS5_I2C, node_list,
+ CONFIG_MAX_I2C_NUM);
+ process_nodes(blob, node_list, count, 1);
+
+}

void board_i2c_init(const void *blob)
{
@@ -1017,9 +1037,10 @@ void board_i2c_init(const void *blob)
COMPAT_SAMSUNG_EXYNOS5_I2C, node_list,
CONFIG_MAX_I2C_NUM);
process_nodes(blob, node_list, count, 1);
-
}

+#ifndef CONFIG_SYS_I2C
+/* TODO: fix this as per comments from upstream */
int i2c_get_bus_num_fdt(int node)
{
int i;
@@ -1062,5 +1083,42 @@ int i2c_reset_port_fdt(const void *blob, int node)
return 0;
}
#endif
+#endif

+/*
+ * Register soft i2c adapters
+ */
+U_BOOT_I2C_ADAP_COMPLETE(s3c0, s3c_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 0)
+U_BOOT_I2C_ADAP_COMPLETE(s3c1, s3c_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 1)
+U_BOOT_I2C_ADAP_COMPLETE(s3c2, s3c_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 2)
+U_BOOT_I2C_ADAP_COMPLETE(s3c3, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 3)
+U_BOOT_I2C_ADAP_COMPLETE(s3c4, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 4)
+U_BOOT_I2C_ADAP_COMPLETE(s3c5, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 5)
+U_BOOT_I2C_ADAP_COMPLETE(s3c6, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 6)
+U_BOOT_I2C_ADAP_COMPLETE(s3c7, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 7)
+U_BOOT_I2C_ADAP_COMPLETE(s3c8, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 8)
+U_BOOT_I2C_ADAP_COMPLETE(s3c9, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 9)
+U_BOOT_I2C_ADAP_COMPLETE(s3c10, exynos_i2c_init, s3c_i2c_probe,
+ s3c_i2c_read, s3c_i2c_write,
+ s3c_i2c_set_bus_speed, 100000, 0, 10)
#endif /* CONFIG_HARD_I2C */
--
1.7.9.5