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S5P: Serial: Add fdt support to driver 

This patch adds FDT support to the serial s5p driver.
At present disabling the serial console (from the device tree) crashes
U-Boot. Add checks for this case, so that execution can continue without
a serial console.
It also enables the serial_s5p driver recognize the silent_console option.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
utp
Rajeshwari Shinde 2013-06-24 16:47:22 +05:30 committed by Minkyu Kang
parent 4603e8cf8b
commit d4ec8f0885
1 changed files with 78 additions and 0 deletions
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78
drivers/serial/serial_s5p.c
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@ -22,6 +22,7 @@
*/
#include <common.h>
#include <fdtdec.h>
#include <linux/compiler.h>
#include <asm/io.h>
#include <asm/arch/uart.h>
@ -34,10 +35,21 @@ DECLARE_GLOBAL_DATA_PTR;
#define RX_FIFO_FULL_MASK (1 << 8)
#define TX_FIFO_FULL_MASK (1 << 24)
/* Information about a serial port */
struct fdt_serial {
u32 base_addr; /* address of registers in physical memory */
u8 port_id; /* uart port number */
u8 enabled; /* 1 if enabled, 0 if disabled */
} config __attribute__ ((section(".data")));
static inline struct s5p_uart *s5p_get_base_uart(int dev_index)
{
#ifdef CONFIG_OF_CONTROL
return (struct s5p_uart *)(config.base_addr);
#else
u32 offset = dev_index * sizeof(struct s5p_uart);
return (struct s5p_uart *)(samsung_get_base_uart() + offset);
#endif
}
/*
@ -73,6 +85,16 @@ void serial_setbrg_dev(const int dev_index)
u32 baudrate = gd->baudrate;
u32 val;
#if defined(CONFIG_SILENT_CONSOLE) && \
defined(CONFIG_OF_CONTROL) && \
!defined(CONFIG_SPL_BUILD)
if (fdtdec_get_config_int(gd->fdt_blob, "silent_console", 0))
gd->flags |= GD_FLG_SILENT;
#endif
if (!config.enabled)
return;
val = uclk / baudrate;
writel(val / 16 - 1, &uart->ubrdiv);
@ -133,6 +155,9 @@ int serial_getc_dev(const int dev_index)
{
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
if (!config.enabled)
return 0;
/* wait for character to arrive */
while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
RX_FIFO_FULL_MASK))) {
@ -150,6 +175,9 @@ void serial_putc_dev(const char c, const int dev_index)
{
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
if (!config.enabled)
return;
/* wait for room in the tx FIFO */
while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
if (serial_err_check(dev_index, 1))
@ -170,6 +198,9 @@ int serial_tstc_dev(const int dev_index)
{
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
if (!config.enabled)
return 0;
return (int)(readl(&uart->utrstat) & 0x1);
}
@ -212,8 +243,54 @@ DECLARE_S5P_SERIAL_FUNCTIONS(3);
struct serial_device s5p_serial3_device =
INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3");
#ifdef CONFIG_OF_CONTROL
int fdtdec_decode_console(int *index, struct fdt_serial *uart)
{
const void *blob = gd->fdt_blob;
int node;
node = fdt_path_offset(blob, "console");
if (node < 0)
return node;
uart->base_addr = fdtdec_get_addr(blob, node, "reg");
if (uart->base_addr == FDT_ADDR_T_NONE)
return -FDT_ERR_NOTFOUND;
uart->port_id = fdtdec_get_int(blob, node, "id", -1);
uart->enabled = fdtdec_get_is_enabled(blob, node);
return 0;
}
#endif
__weak struct serial_device *default_serial_console(void)
{
#ifdef CONFIG_OF_CONTROL
int index = 0;
if ((!config.base_addr) && (fdtdec_decode_console(&index, &config))) {
debug("Cannot decode default console node\n");
return NULL;
}
switch (config.port_id) {
case 0:
return &s5p_serial0_device;
case 1:
return &s5p_serial1_device;
case 2:
return &s5p_serial2_device;
case 3:
return &s5p_serial3_device;
default:
debug("Unknown config.port_id: %d", config.port_id);
break;
}
return NULL;
#else
config.enabled = 1;
#if defined(CONFIG_SERIAL0)
return &s5p_serial0_device;
#elif defined(CONFIG_SERIAL1)
@ -225,6 +302,7 @@ __weak struct serial_device *default_serial_console(void)
#else
#error "CONFIG_SERIAL? missing."
#endif
#endif
}
void s5p_serial_initialize(void)