This patch is the serial driver for S5PC100 & SMDKC100.

Signed-off-by: HeungJun, Kim riverful.kim@samsung.com

---

drivers/serial/Makefile | 1 + drivers/serial/serial_s5pc100.c | 179 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 180 insertions(+), 0 deletions(-) create mode 100644 drivers/serial/serial_s5pc100.c

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 64882a2..3334442 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -49,6 +49,7 @@ COBJS-$(CONFIG_PXA_SERIAL) += serial_pxa.o COBJS-$(CONFIG_SA1100_SERIAL) += serial_sa1100.o COBJS-$(CONFIG_S3C24X0_SERIAL) += serial_s3c24x0.o COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o +COBJS-$(CONFIG_S5PC100_SERIAL) += serial_s5pc100.o COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o COBJS-$(CONFIG_USB_TTY) += usbtty.o diff --git a/drivers/serial/serial_s5pc100.c b/drivers/serial/serial_s5pc100.c new file mode 100644 index 0000000..9394e77 --- /dev/null +++ b/drivers/serial/serial_s5pc100.c @@ -0,0 +1,179 @@ +/* + * (C) Copyright 2009 + * Inki Dae, SAMSUNG Electronics, inki.dae@samsung.com + * Heungjun Kim, SAMSUNG Electronics, riverful.kim@samsung.com + * Minkyu Kang, SAMSUNG Electronics, mk7.kang@samsung.com + * + * (C) Copyright 2002 + * Gary Jennejohn, DENX Software Engineering, gj@denx.de + * + * (C) Copyright 2008 + * Guennadi Liakhovetki, DENX Software Engineering, lg@denx.de + * + * 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> + +#ifdef CONFIG_SERIAL0 +#define UART_NR S5PC1XX_UART0 +#elif defined(CONFIG_SERIAL1) +#define UART_NR S5PC1XX_UART1 +#elif defined(CONFIG_SERIAL2) +#define UART_NR S5PC1XX_UART2 +#elif defined(CONFIG_SERIAL3) +#define UART_NR S5PC1XX_UART3 +#else +#error "Bad: you didn't configure serial ..." +#endif + +#define barrier() asm volatile("" ::: "memory") + +static inline s5pc1xx_uart_t *s5pc1xx_get_base_uart(enum s5pc1xx_uarts_nr nr) +{ + return (s5pc1xx_uart_t *)(S5P_UART_BASE + (nr * 0x400)); +} + +/* + * 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(void) +{ + DECLARE_GLOBAL_DATA_PTR; + s5pc1xx_uart_t *const uart = s5pc1xx_get_base_uart(UART_NR); + u32 pclk = get_PCLK(); + u32 baudrate = gd->baudrate; + int i; + + i = (pclk / baudrate) % 16; + + uart->UBRDIV = pclk / baudrate / 16 - 1; + uart->UDIVSLOT = udivslot[i]; + + for (i = 0; i < 100; i++); + barrier(); +} + +/* + * 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(void) +{ + s5pc1xx_uart_t *const uart = s5pc1xx_get_base_uart(UART_NR); + + /* reset and enable FIFOs, set triggers to the maximum */ + uart->UFCON = 0; + uart->UMCON = 0; + /* 8N1 */ + uart->ULCON = 0x3; + /* No interrupts, no DMA, pure polling */ + uart->UCON = 0x245; + + serial_setbrg(); + + 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(void) +{ + s5pc1xx_uart_t *const uart = s5pc1xx_get_base_uart(UART_NR); + + /* wait for character to arrive */ + while (!(uart->UTRSTAT & 0x1)); + + return uart->URXH & 0xff; +} + +#ifdef CONFIG_MODEM_SUPPORT +static int be_quiet; +void disable_putc(void) +{ + be_quiet = 1; +} + +void enable_putc(void) +{ + be_quiet = 0; +} +#endif + + +/* + * Output a single byte to the serial port. + */ +void serial_putc(const char c) +{ + s5pc1xx_uart_t *const uart = s5pc1xx_get_base_uart(UART_NR); + +#ifdef CONFIG_MODEM_SUPPORT + if (be_quiet) + return; +#endif + + /* wait for room in the tx FIFO */ + while (!(uart->UTRSTAT & 0x2)); + + uart->UTXH = c; + + /* If \n, also do \r */ + if (c == '\n') + serial_putc('\r'); +} + +/* + * Test whether a character is in the RX buffer + */ +int serial_tstc(void) +{ + s5pc1xx_uart_t *const uart = s5pc1xx_get_base_uart(UART_NR); + + return uart->UTRSTAT & 0x1; +} + +void serial_puts(const char *s) +{ + while (*s) + serial_putc(*s++); +}