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authorRajeshwari Shinde <rajeshwari.s@samsung.com>2013-06-24 16:47:22 +0530
committerMinkyu Kang <mk7.kang@samsung.com>2013-06-24 20:47:41 +0900
commitd4ec8f08856bea73a0def00a7f09dff6a3541604 (patch)
tree8c1bebe1938236b24805bf24e5706783c81e24e4 /drivers/serial
parent4603e8cf8b217be397559d9c9c0cf741e20efd8b (diff)
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>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/serial_s5p.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index e65125ccd74..6836c7a2259 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -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)