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 --- Changes in V2: - None Changes in V3: - Moved driver config structure to data section. - Changed silent_console to silent-console. - Did put a check for base address before doing fdt decoding. Changes in V4: - None Changes in V5: - None Changes in V6: - Changed the if..else condition to a switch statement. Chnages in V7: - None. drivers/serial/serial_s5p.c | 78 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 78 insertions(+), 0 deletions(-)
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c index e65125c..6836c7a 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)