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dm: exynos: Move serial to driver model

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Change the Exynos serial driver to work with driver model and switch over
all relevant boards to use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-09-14 16:36:17 -06:00
parent 9208fffebc
commit 73e256c2ac
4 changed files with 80 additions and 188 deletions
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265
drivers/serial/serial_s5p.c
View file

@ -9,6 +9,8 @@
*/ */
#include <common.h> #include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h> #include <fdtdec.h>
#include <linux/compiler.h> #include <linux/compiler.h>
#include <asm/io.h> #include <asm/io.h>
@ -18,26 +20,18 @@
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
#define RX_FIFO_COUNT_MASK 0xff #define RX_FIFO_COUNT_SHIFT 0
#define RX_FIFO_FULL_MASK (1 << 8) #define RX_FIFO_COUNT_MASK (0xff << RX_FIFO_COUNT_SHIFT)
#define TX_FIFO_FULL_MASK (1 << 24) #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 */ /* Information about a serial port */
struct fdt_serial { struct s5p_serial_platdata {
u32 base_addr; /* address of registers in physical memory */ struct s5p_uart *reg; /* address of registers in physical memory */
u8 port_id; /* uart port number */ 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 * The coefficient, used to calculate the baudrate on S5P UARTs is
@ -65,23 +59,13 @@ static const int udivslot[] = {
0xffdf, 0xffdf,
}; };
static void serial_setbrg_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;
u32 uclk = get_uart_clk(dev_index); struct s5p_uart *const uart = plat->reg;
u32 baudrate = gd->baudrate; u32 uclk = get_uart_clk(plat->port_id);
u32 val; 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; val = uclk / baudrate;
writel(val / 16 - 1, &uart->ubrdiv); writel(val / 16 - 1, &uart->ubrdiv);
@ -90,15 +74,14 @@ static void serial_setbrg_dev(const int dev_index)
writew(udivslot[val % 16], &uart->rest.slot); writew(udivslot[val % 16], &uart->rest.slot);
else else
writeb(val % 16, &uart->rest.value); writeb(val % 16, &uart->rest.value);
return 0;
} }
/* static int s5p_serial_probe(struct udevice *dev)
* 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)
{ {
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;
/* enable FIFOs, auto clear Rx FIFO */ /* enable FIFOs, auto clear Rx FIFO */
writel(0x3, &uart->ufcon); writel(0x3, &uart->ufcon);
@ -108,14 +91,11 @@ static int serial_init_dev(const int dev_index)
/* No interrupts, no DMA, pure polling */ /* No interrupts, no DMA, pure polling */
writel(0x245, &uart->ucon); writel(0x245, &uart->ucon);
serial_setbrg_dev(dev_index);
return 0; return 0;
} }
static int serial_err_check(const int dev_index, int op) static int serial_err_check(const struct s5p_uart *const uart, int op)
{ {
struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
unsigned int mask; unsigned int mask;
/* /*
@ -133,169 +113,78 @@ static int serial_err_check(const int dev_index, int op)
return readl(&uart->uerstat) & mask; return readl(&uart->uerstat) & mask;
} }
/* static int s5p_serial_getc(struct udevice *dev)
* 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)
{ {
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) if (!(readl(&uart->ufstat) & RX_FIFO_COUNT_MASK))
return 0; 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;
}
serial_err_check(uart, 0);
return (int)(readb(&uart->urxh) & 0xff); return (int)(readb(&uart->urxh) & 0xff);
} }
/* static int s5p_serial_putc(struct udevice *dev, const char ch)
* Output a single byte to the serial port.
*/
static void serial_putc_dev(const char c, const int dev_index)
{ {
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) if (readl(&uart->ufstat) & TX_FIFO_FULL)
return; return -EAGAIN;
/* wait for room in the tx FIFO */ writeb(ch, &uart->utxh);
while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) { serial_err_check(uart, 1);
if (serial_err_check(dev_index, 1))
return;
}
writeb(c, &uart->utxh);
/* If \n, also do \r */
if (c == '\n')
serial_putc('\r');
}
/*
* Test whether a character is in the RX buffer
*/
static 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);
}
static void serial_puts_dev(const char *s, const int dev_index)
{
while (*s)
serial_putc_dev(*s++, dev_index);
}
/* 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, \
}
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)
{
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; return 0;
} }
#endif
__weak struct serial_device *default_serial_console(void) static int s5p_serial_pending(struct udevice *dev, bool input)
{ {
#ifdef CONFIG_OF_CONTROL struct s5p_serial_platdata *plat = dev->platdata;
int index = 0; struct s5p_uart *const uart = plat->reg;
uint32_t ufstat = readl(&uart->ufstat);
if ((!config.base_addr) && (fdtdec_decode_console(&index, &config))) { if (input)
debug("Cannot decode default console node\n"); return (ufstat & RX_FIFO_COUNT_MASK) >> RX_FIFO_COUNT_SHIFT;
return NULL; else
} return (ufstat & TX_FIFO_COUNT_MASK) >> TX_FIFO_COUNT_SHIFT;
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
} }
void s5p_serial_initialize(void) static int s5p_serial_ofdata_to_platdata(struct udevice *dev)
{ {
serial_register(&s5p_serial0_device); struct s5p_serial_platdata *plat = dev->platdata;
serial_register(&s5p_serial1_device); fdt_addr_t addr;
serial_register(&s5p_serial2_device);
serial_register(&s5p_serial3_device); addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
plat->reg = (struct s5p_uart *)addr;
plat->port_id = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "id", -1);
return 0;
} }
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,
};
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,
};

1
include/configs/exynos-common.h
View file

@ -20,6 +20,7 @@
#define CONFIG_DM #define CONFIG_DM
#define CONFIG_CMD_DM #define CONFIG_CMD_DM
#define CONFIG_DM_GPIO #define CONFIG_DM_GPIO
#define CONFIG_DM_SERIAL
#define CONFIG_ARCH_CPU_INIT #define CONFIG_ARCH_CPU_INIT
#define CONFIG_DISPLAY_CPUINFO #define CONFIG_DISPLAY_CPUINFO

1
include/configs/s5p_goni.h
View file

@ -292,5 +292,6 @@
#define CONFIG_DM #define CONFIG_DM
#define CONFIG_CMD_DM #define CONFIG_CMD_DM
#define CONFIG_DM_GPIO #define CONFIG_DM_GPIO
#define CONFIG_DM_SERIAL
#endif /* __CONFIG_H */ #endif /* __CONFIG_H */

1
include/configs/smdkc100.h
View file

@ -227,5 +227,6 @@
#define CONFIG_DM #define CONFIG_DM
#define CONFIG_CMD_DM #define CONFIG_CMD_DM
#define CONFIG_DM_GPIO #define CONFIG_DM_GPIO
#define CONFIG_DM_SERIAL
#endif /* __CONFIG_H */ #endif /* __CONFIG_H */