diff options
| -rw-r--r-- | common/serial.c | 18 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/serial_s5pc1xx.c | 195 | ||||
| -rw-r--r-- | include/serial.h | 7 |
4 files changed, 221 insertions, 0 deletions
diff --git a/common/serial.c b/common/serial.c index b4db46b..5f9ffd7 100644 --- a/common/serial.c +++ b/common/serial.c @@ -69,6 +69,18 @@ struct serial_device *__default_serial_console (void) #else #error "CONFIG_SERIAL? missing." #endif +#elif defined(CONFIG_S5PC1XX) +#if defined(CONFIG_SERIAL0) + return &s5pc1xx_serial0_device; +#elif defined(CONFIG_SERIAL1) + return &s5pc1xx_serial1_device; +#elif defined(CONFIG_SERIAL2) + return &s5pc1xx_serial2_device; +#elif defined(CONFIG_SERIAL3) + return &s5pc1xx_serial3_device; +#else +#error "CONFIG_SERIAL? missing." +#endif #elif defined(CONFIG_OMAP3_ZOOM2) return ZOOM2_DEFAULT_SERIAL_DEVICE; #else @@ -141,6 +153,12 @@ void serial_initialize (void) serial_register(&s3c24xx_serial1_device); serial_register(&s3c24xx_serial2_device); #endif +#if defined(CONFIG_S5PC1XX) + serial_register(&s5pc1xx_serial0_device); + serial_register(&s5pc1xx_serial1_device); + serial_register(&s5pc1xx_serial2_device); + serial_register(&s5pc1xx_serial3_device); +#endif serial_assign (default_serial_console ()->name); } diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 64882a2..3c77a7c 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -33,6 +33,7 @@ COBJS-$(CONFIG_NS9750_UART) += ns9750_serial.o COBJS-$(CONFIG_SYS_NS16550) += ns16550.o COBJS-$(CONFIG_DRIVER_S3C4510_UART) += s3c4510b_uart.o COBJS-$(CONFIG_S3C64XX) += s3c64xx.o +COBJS-$(CONFIG_S5PC1XX) += serial_s5pc1xx.o COBJS-$(CONFIG_SYS_NS16550_SERIAL) += serial.o COBJS-$(CONFIG_CLPS7111_SERIAL) += serial_clps7111.o COBJS-$(CONFIG_IMX_SERIAL) += serial_imx.o diff --git a/drivers/serial/serial_s5pc1xx.c b/drivers/serial/serial_s5pc1xx.c new file mode 100644 index 0000000..64c1dcc --- /dev/null +++ b/drivers/serial/serial_s5pc1xx.c @@ -0,0 +1,195 @@ +/* + * (C) Copyright 2009 SAMSUNG Electronics + * Minkyu Kang <mk7.kang@samsung.com> + * Heungjun Kim <riverful.kim@samsung.com> + * + * based on drivers/serial/s3c64xx.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/arch/uart.h> +#include <asm/arch/clk.h> +#include <serial.h> + +static inline struct s5pc1xx_uart *s5pc1xx_get_base_uart(int dev_index) +{ + u32 offset = dev_index * sizeof(struct s5pc1xx_uart); + + if (cpu_is_s5pc100()) + return (struct s5pc1xx_uart *)(S5PC100_UART_BASE + offset); + else + return (struct s5pc1xx_uart *)(S5PC110_UART_BASE + offset); +} + +/* + * The coefficient, used to calculate the baudrate on S5PC1XX UARTs is + * calculated as + * C = UBRDIV * 16 + number_of_set_bits_in_UDIVSLOT + * however, section 31.6.11 of the datasheet doesn't recomment using 1 for 1, + * 3 for 2, ... (2^n - 1) for n, instead, they suggest using these constants: + */ +static const int udivslot[] = { + 0, + 0x0080, + 0x0808, + 0x0888, + 0x2222, + 0x4924, + 0x4a52, + 0x54aa, + 0x5555, + 0xd555, + 0xd5d5, + 0xddd5, + 0xdddd, + 0xdfdd, + 0xdfdf, + 0xffdf, +}; + +void serial_setbrg_dev(const int dev_index) +{ + DECLARE_GLOBAL_DATA_PTR; + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + u32 pclk = get_pclk(); + u32 baudrate = gd->baudrate; + u32 val; + + val = pclk / baudrate; + + writel(val / 16 - 1, &uart->ubrdiv); + writel(udivslot[val % 16], &uart->udivslot); +} + +/* + * Initialise the serial port with the given baudrate. The settings + * are always 8 data bits, no parity, 1 stop bit, no start bits. + */ +int serial_init_dev(const int dev_index) +{ + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + + /* reset and enable FIFOs, set triggers to the maximum */ + writel(0, &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) +{ + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + + if (readl(&uart->uerstat) & 0xf) + return 1; + + return 0; +} + +/* + * 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. + */ +int serial_getc_dev(const int dev_index) +{ + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + + /* wait for character to arrive */ + while (!(readl(&uart->utrstat) & 0x1)) { + if (serial_err_check(dev_index)) + return 0; + } + + return (int)(readl(&uart->urxh) & 0xff); +} + +/* + * Output a single byte to the serial port. + */ +void serial_putc_dev(const char c, const int dev_index) +{ + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + + /* wait for room in the tx FIFO */ + while (!(readl(&uart->utrstat) & 0x2)) { + if (serial_err_check(dev_index)) + return; + } + + writel(c, &uart->utxh); + + /* If \n, also do \r */ + if (c == '\n') + serial_putc('\r'); +} + +/* + * Test whether a character is in the RX buffer + */ +int serial_tstc_dev(const int dev_index) +{ + struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); + + return (int)(readl(&uart->utrstat) & 0x1); +} + +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) \ +int s5p_serial##port##_init(void) { return serial_init_dev(port); } \ +void s5p_serial##port##_setbrg(void) { serial_setbrg_dev(port); } \ +int s5p_serial##port##_getc(void) { return serial_getc_dev(port); } \ +int s5p_serial##port##_tstc(void) { return serial_tstc_dev(port); } \ +void s5p_serial##port##_putc(const char c) { serial_putc_dev(c, port); } \ +void s5p_serial##port##_puts(const char *s) { serial_puts_dev(s, port); } + +#define INIT_S5P_SERIAL_STRUCTURE(port, name, bus) { \ + name, \ + bus, \ + s5p_serial##port##_init, \ + s5p_serial##port##_setbrg, \ + s5p_serial##port##_getc, \ + s5p_serial##port##_tstc, \ + s5p_serial##port##_putc, \ + s5p_serial##port##_puts, } + +DECLARE_S5P_SERIAL_FUNCTIONS(0); +struct serial_device s5pc1xx_serial0_device = + INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0", "S5PUART0"); +DECLARE_S5P_SERIAL_FUNCTIONS(1); +struct serial_device s5pc1xx_serial1_device = + INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1", "S5PUART1"); +DECLARE_S5P_SERIAL_FUNCTIONS(2); +struct serial_device s5pc1xx_serial2_device = + INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2", "S5PUART2"); +DECLARE_S5P_SERIAL_FUNCTIONS(3); +struct serial_device s5pc1xx_serial3_device = + INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3", "S5PUART3"); diff --git a/include/serial.h b/include/serial.h index 821b583..bbda3f0 100644 --- a/include/serial.h +++ b/include/serial.h @@ -43,6 +43,13 @@ extern struct serial_device s3c24xx_serial1_device; extern struct serial_device s3c24xx_serial2_device; #endif +#if defined(CONFIG_S5PC1XX) +extern struct serial_device s5pc1xx_serial0_device; +extern struct serial_device s5pc1xx_serial1_device; +extern struct serial_device s5pc1xx_serial2_device; +extern struct serial_device s5pc1xx_serial3_device; +#endif + #if defined(CONFIG_OMAP3_ZOOM2) extern struct serial_device zoom2_serial_device0; extern struct serial_device zoom2_serial_device1; |