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I2C: Driver changes for FDT support

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Functions added to get the I2C bus number and reset I2C bus using
FDT node.

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Rajeshwari Shinde 2012-12-26 20:03:12 +00:00 committed by Minkyu Kang
parent d055911887
commit a9d2ae7014
3 changed files with 116 additions and 1 deletions
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83
drivers/i2c/s3c24x0_i2c.c
View File

@ -27,9 +27,11 @@
*/
#include <common.h>
#include <fdtdec.h>
#if (defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
#include <asm/arch/clk.h>
#include <asm/arch/cpu.h>
#include <asm/arch/pinmux.h>
#else
#include <asm/arch/s3c24x0_cpu.h>
#endif
@ -60,7 +62,14 @@
#define I2C_TIMEOUT 1 /* 1 second */
static unsigned int g_current_bus; /* Stores Current I2C Bus */
/*
* For SPL boot some boards need i2c before SDRAM is initialised so force
* variables to live in SRAM
*/
static unsigned int g_current_bus __attribute__((section(".data")));
static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM]
__attribute__((section(".data")));
static int i2c_busses __attribute__((section(".data")));
#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
static int GetI2CSDA(void)
@ -512,4 +521,76 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
(i2c, I2C_WRITE, chip << 1, &xaddr[4 - alen], alen, buffer,
len) != 0);
}
#ifdef CONFIG_OF_CONTROL
void board_i2c_init(const void *blob)
{
int node_list[CONFIG_MAX_I2C_NUM];
int count, i;
count = fdtdec_find_aliases_for_id(blob, "i2c",
COMPAT_SAMSUNG_S3C2440_I2C, node_list,
CONFIG_MAX_I2C_NUM);
for (i = 0; i < count; i++) {
struct s3c24x0_i2c_bus *bus;
int node = node_list[i];
if (node <= 0)
continue;
bus = &i2c_bus[i];
bus->regs = (struct s3c24x0_i2c *)
fdtdec_get_addr(blob, node, "reg");
bus->id = pinmux_decode_periph_id(blob, node);
bus->node = node;
bus->bus_num = i2c_busses++;
exynos_pinmux_config(bus->id, 0);
}
}
static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx)
{
if (bus_idx < i2c_busses)
return &i2c_bus[bus_idx];
debug("Undefined bus: %d\n", bus_idx);
return NULL;
}
int i2c_get_bus_num_fdt(int node)
{
int i;
for (i = 0; i < i2c_busses; i++) {
if (node == i2c_bus[i].node)
return i;
}
debug("%s: Can't find any matched I2C bus\n", __func__);
return -1;
}
int i2c_reset_port_fdt(const void *blob, int node)
{
struct s3c24x0_i2c_bus *i2c;
int bus;
bus = i2c_get_bus_num_fdt(node);
if (bus < 0) {
debug("could not get bus for node %d\n", node);
return -1;
}
i2c = get_bus(bus);
if (!i2c) {
debug("get_bus() failed for node node %d\n", node);
return -1;
}
i2c_ch_init(i2c->regs, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
return 0;
}
#endif
#endif /* CONFIG_HARD_I2C */

8
drivers/i2c/s3c24x0_i2c.h
View File

@ -30,4 +30,12 @@ struct s3c24x0_i2c {
u32 iicds;
u32 iiclc;
};
struct s3c24x0_i2c_bus {
int node; /* device tree node */
int bus_num; /* i2c bus number */
struct s3c24x0_i2c *regs;
enum periph_id id;
};
#endif /* _S3C24X0_I2C_H */

26
include/i2c.h
View File

@ -262,4 +262,30 @@ extern int get_multi_scl_pin(void);
extern int get_multi_sda_pin(void);
extern int multi_i2c_init(void);
#endif
/**
* Get FDT values for i2c bus.
*
* @param blob Device tree blbo
* @return the number of I2C bus
*/
void board_i2c_init(const void *blob);
/**
* Find the I2C bus number by given a FDT I2C node.
*
* @param blob Device tree blbo
* @param node FDT I2C node to find
* @return the number of I2C bus (zero based), or -1 on error
*/
int i2c_get_bus_num_fdt(int node);
/**
* Reset the I2C bus represented by the given a FDT I2C node.
*
* @param blob Device tree blbo
* @param node FDT I2C node to find
* @return 0 if port was reset, -1 if not found
*/
int i2c_reset_port_fdt(const void *blob, int node);
#endif /* _I2C_H_ */