[U-Boot] [PATCH v2 8/9] dm: exynos: Move serial to driver model
Simon Glass
sjg at chromium.org
Sun Jul 13 20:27:41 CEST 2014
Change the Exynos serial driver to work with driver model and switch over
all Exynos5 boards to use it.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2: None
drivers/serial/serial_s5p.c | 295 ++++++++++++++-----------------------------
include/configs/exynos5-dt.h | 1 +
2 files changed, 93 insertions(+), 203 deletions(-)
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 98c62b4..a2719e2 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -9,6 +9,8 @@
*/
#include <common.h>
+#include <dm.h>
+#include <errno.h>
#include <fdtdec.h>
#include <linux/compiler.h>
#include <asm/io.h>
@@ -18,26 +20,18 @@
DECLARE_GLOBAL_DATA_PTR;
-#define RX_FIFO_COUNT_MASK 0xff
-#define RX_FIFO_FULL_MASK (1 << 8)
-#define TX_FIFO_FULL_MASK (1 << 24)
+#define RX_FIFO_COUNT_SHIFT 0
+#define RX_FIFO_COUNT_MASK (0xff << RX_FIFO_COUNT_SHIFT)
+#define RX_FIFO_FULL (1 << 8)
+#define TX_FIFO_COUNT_SHIFT 16
+#define TX_FIFO_COUNT_MASK (0xff << TX_FIFO_COUNT_SHIFT)
+#define TX_FIFO_FULL (1 << 24)
/* Information about a serial port */
-struct fdt_serial {
- u32 base_addr; /* address of registers in physical memory */
+struct s5p_serial_platdata {
+ struct s5p_uart *reg; /* 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
-}
+};
/*
* The coefficient, used to calculate the baudrate on S5P UARTs is
@@ -65,57 +59,8 @@ static const int udivslot[] = {
0xffdf,
};
-static void serial_setbrg_dev(const int dev_index)
-{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
- u32 uclk = get_uart_clk(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);
-
- if (s5p_uart_divslot())
- writew(udivslot[val % 16], &uart->rest.slot);
- else
- writeb(val % 16, &uart->rest.value);
-}
-
-/*
- * Initialise the serial port with the given baudrate. The settings
- * are always 8 data bits, no parity, 1 stop bit, no start bits.
- */
-static int serial_init_dev(const int dev_index)
+static int serial_err_check(const struct s5p_uart *const uart, int op)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
-
- /* enable FIFOs, auto clear Rx FIFO */
- writel(0x3, &uart->ufcon);
- writel(0, &uart->umcon);
- /* 8N1 */
- writel(0x3, &uart->ulcon);
- /* No interrupts, no DMA, pure polling */
- writel(0x245, &uart->ucon);
-
- serial_setbrg_dev(dev_index);
-
- return 0;
-}
-
-static int serial_err_check(const int dev_index, int op)
-{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
unsigned int mask;
/*
@@ -133,169 +78,113 @@ static int serial_err_check(const int dev_index, int op)
return readl(&uart->uerstat) & mask;
}
-/*
- * Read a single byte from the serial port. Returns 1 on success, 0
- * otherwise. When the function is succesfull, the character read is
- * written into its argument c.
- */
-static int serial_getc_dev(const int dev_index)
+static int s5p_serial_putc(struct udevice *dev, const char ch)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
- if (!config.enabled)
- return 0;
+ if (readl(&uart->ufstat) & TX_FIFO_FULL)
+ return -EAGAIN;
- /* wait for character to arrive */
- while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
- RX_FIFO_FULL_MASK))) {
- if (serial_err_check(dev_index, 0))
- return 0;
- }
+ writeb(ch, &uart->utxh);
+ serial_err_check(uart, 1);
- return (int)(readb(&uart->urxh) & 0xff);
+ return 0;
}
-/*
- * Output a single byte to the serial port.
- */
-static void serial_putc_dev(const char c, const int dev_index)
+static int s5p_serial_pending(struct udevice *dev, bool input)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+ uint32_t ufstat = readl(&uart->ufstat);
- if (!config.enabled)
- return;
+ if (input)
+ return (ufstat & RX_FIFO_COUNT_MASK) >> RX_FIFO_COUNT_SHIFT;
+ else
+ return (ufstat & TX_FIFO_COUNT_MASK) >> TX_FIFO_COUNT_SHIFT;
+}
- /* wait for room in the tx FIFO */
- while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
- if (serial_err_check(dev_index, 1))
- return;
- }
+static int s5p_serial_getc(struct udevice *dev)
+{
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
- writeb(c, &uart->utxh);
+ if (!(readl(&uart->ufstat) & RX_FIFO_COUNT_MASK))
+ return -EAGAIN;
- /* If \n, also do \r */
- if (c == '\n')
- serial_putc('\r');
+ serial_err_check(uart, 0);
+ return (int)(readb(&uart->urxh) & 0xff);
}
-/*
- * Test whether a character is in the RX buffer
- */
-static int serial_tstc_dev(const int dev_index)
+int s5p_serial_setbrg(struct udevice *dev, int baudrate)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+ u32 uclk = get_uart_clk(plat->port_id);
+ u32 val;
- if (!config.enabled)
- return 0;
+ val = uclk / baudrate;
+
+ writel(val / 16 - 1, &uart->ubrdiv);
- return (int)(readl(&uart->utrstat) & 0x1);
+ if (s5p_uart_divslot())
+ writew(udivslot[val % 16], &uart->rest.slot);
+ else
+ writeb(val % 16, &uart->rest.value);
+
+ return 0;
}
-static void serial_puts_dev(const char *s, const int dev_index)
+static int s5p_serial_probe(struct udevice *dev)
{
- while (*s)
- serial_putc_dev(*s++, dev_index);
-}
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+
+ /* enable FIFOs, auto clear Rx FIFO */
+ writel(0x3, &uart->ufcon);
+ writel(0, &uart->umcon);
+ /* 8N1 */
+ writel(0x3, &uart->ulcon);
+ /* No interrupts, no DMA, pure polling */
+ writel(0x245, &uart->ucon);
-/* Multi serial device functions */
-#define DECLARE_S5P_SERIAL_FUNCTIONS(port) \
-static int s5p_serial##port##_init(void) { return serial_init_dev(port); } \
-static void s5p_serial##port##_setbrg(void) { serial_setbrg_dev(port); } \
-static int s5p_serial##port##_getc(void) { return serial_getc_dev(port); } \
-static int s5p_serial##port##_tstc(void) { return serial_tstc_dev(port); } \
-static void s5p_serial##port##_putc(const char c) { serial_putc_dev(c, port); } \
-static void s5p_serial##port##_puts(const char *s) { serial_puts_dev(s, port); }
-
-#define INIT_S5P_SERIAL_STRUCTURE(port, __name) { \
- .name = __name, \
- .start = s5p_serial##port##_init, \
- .stop = NULL, \
- .setbrg = s5p_serial##port##_setbrg, \
- .getc = s5p_serial##port##_getc, \
- .tstc = s5p_serial##port##_tstc, \
- .putc = s5p_serial##port##_putc, \
- .puts = s5p_serial##port##_puts, \
+ return 0;
}
-DECLARE_S5P_SERIAL_FUNCTIONS(0);
-struct serial_device s5p_serial0_device =
- INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0");
-DECLARE_S5P_SERIAL_FUNCTIONS(1);
-struct serial_device s5p_serial1_device =
- INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1");
-DECLARE_S5P_SERIAL_FUNCTIONS(2);
-struct serial_device s5p_serial2_device =
- INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2");
-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)
+static int s5p_serial_ofdata_to_platdata(struct udevice *dev)
{
- const void *blob = gd->fdt_blob;
- int node;
+ struct s5p_serial_platdata *plat = dev->platdata;
+ fdt_addr_t addr;
- node = fdt_path_offset(blob, "console");
- if (node < 0)
- return node;
+ addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
- 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);
+ plat->reg = (struct s5p_uart *)addr;
+ plat->port_id = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "id", -1);
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)
- return &s5p_serial1_device;
-#elif defined(CONFIG_SERIAL2)
- return &s5p_serial2_device;
-#elif defined(CONFIG_SERIAL3)
- return &s5p_serial3_device;
-#else
-#error "CONFIG_SERIAL? missing."
-#endif
-#endif
-}
+static const struct dm_serial_ops s5p_serial_ops = {
+ .putc = s5p_serial_putc,
+ .pending = s5p_serial_pending,
+ .getc = s5p_serial_getc,
+ .setbrg = s5p_serial_setbrg,
+};
-void s5p_serial_initialize(void)
-{
- serial_register(&s5p_serial0_device);
- serial_register(&s5p_serial1_device);
- serial_register(&s5p_serial2_device);
- serial_register(&s5p_serial3_device);
-}
+static const struct udevice_id s5p_serial_ids[] = {
+ { .compatible = "samsung,exynos4210-uart" },
+ { }
+};
+
+U_BOOT_DRIVER(serial_s5p) = {
+ .name = "serial_s5p",
+ .id = UCLASS_SERIAL,
+ .of_match = s5p_serial_ids,
+ .ofdata_to_platdata = s5p_serial_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct s5p_serial_platdata),
+ .probe = s5p_serial_probe,
+ .ops = &s5p_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/include/configs/exynos5-dt.h b/include/configs/exynos5-dt.h
index cc3a409..12b086b 100644
--- a/include/configs/exynos5-dt.h
+++ b/include/configs/exynos5-dt.h
@@ -19,6 +19,7 @@
#define CONFIG_DM
#define CONFIG_CMD_DM
#define CONFIG_DM_GPIO
+#define CONFIG_DM_SERIAL
#define CONFIG_SYS_GENERIC_BOARD
#define CONFIG_ARCH_CPU_INIT
--
2.0.0.526.g5318336
More information about the U-Boot
mailing list