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![Minkyu Kang](/assets/img/avatar_default.png)
fix the following compile warnings warning: dereferencing type-punned pointer will break strict-aliasing rules Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
196 lines
5.1 KiB
C
196 lines
5.1 KiB
C
/*
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* (C) Copyright 2009 SAMSUNG Electronics
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* Minkyu Kang <mk7.kang@samsung.com>
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* Heungjun Kim <riverful.kim@samsung.com>
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*
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* based on drivers/serial/s3c64xx.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/uart.h>
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#include <asm/arch/clk.h>
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#include <serial.h>
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static inline struct s5pc1xx_uart *s5pc1xx_get_base_uart(int dev_index)
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{
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u32 offset = dev_index * sizeof(struct s5pc1xx_uart);
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if (cpu_is_s5pc100())
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return (struct s5pc1xx_uart *)(S5PC100_UART_BASE + offset);
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else
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return (struct s5pc1xx_uart *)(S5PC110_UART_BASE + offset);
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}
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/*
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* The coefficient, used to calculate the baudrate on S5PC1XX UARTs is
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* calculated as
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* C = UBRDIV * 16 + number_of_set_bits_in_UDIVSLOT
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* however, section 31.6.11 of the datasheet doesn't recomment using 1 for 1,
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* 3 for 2, ... (2^n - 1) for n, instead, they suggest using these constants:
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*/
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static const int udivslot[] = {
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0,
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0x0080,
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0x0808,
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0x0888,
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0x2222,
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0x4924,
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0x4a52,
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0x54aa,
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0x5555,
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0xd555,
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0xd5d5,
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0xddd5,
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0xdddd,
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0xdfdd,
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0xdfdf,
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0xffdf,
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};
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void serial_setbrg_dev(const int dev_index)
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{
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DECLARE_GLOBAL_DATA_PTR;
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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u32 pclk = get_pclk();
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u32 baudrate = gd->baudrate;
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u32 val;
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val = pclk / baudrate;
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writel(val / 16 - 1, &uart->ubrdiv);
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writew(udivslot[val % 16], &uart->udivslot);
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*/
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int serial_init_dev(const int dev_index)
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{
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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/* reset and enable FIFOs, set triggers to the maximum */
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writel(0, &uart->ufcon);
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writel(0, &uart->umcon);
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/* 8N1 */
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writel(0x3, &uart->ulcon);
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/* No interrupts, no DMA, pure polling */
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writel(0x245, &uart->ucon);
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serial_setbrg_dev(dev_index);
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return 0;
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}
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static int serial_err_check(const int dev_index)
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{
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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if (readl(&uart->uerstat) & 0xf)
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return 1;
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return 0;
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int serial_getc_dev(const int dev_index)
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{
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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/* wait for character to arrive */
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while (!(readl(&uart->utrstat) & 0x1)) {
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if (serial_err_check(dev_index))
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return 0;
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}
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return (int)(readl(&uart->urxh) & 0xff);
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}
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/*
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* Output a single byte to the serial port.
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*/
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void serial_putc_dev(const char c, const int dev_index)
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{
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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/* wait for room in the tx FIFO */
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while (!(readl(&uart->utrstat) & 0x2)) {
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if (serial_err_check(dev_index))
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return;
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}
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writel(c, &uart->utxh);
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc('\r');
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}
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/*
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* Test whether a character is in the RX buffer
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*/
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int serial_tstc_dev(const int dev_index)
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{
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index);
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return (int)(readl(&uart->utrstat) & 0x1);
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}
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void serial_puts_dev(const char *s, const int dev_index)
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{
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while (*s)
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serial_putc_dev(*s++, dev_index);
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}
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/* Multi serial device functions */
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#define DECLARE_S5P_SERIAL_FUNCTIONS(port) \
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int s5p_serial##port##_init(void) { return serial_init_dev(port); } \
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void s5p_serial##port##_setbrg(void) { serial_setbrg_dev(port); } \
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int s5p_serial##port##_getc(void) { return serial_getc_dev(port); } \
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int s5p_serial##port##_tstc(void) { return serial_tstc_dev(port); } \
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void s5p_serial##port##_putc(const char c) { serial_putc_dev(c, port); } \
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void s5p_serial##port##_puts(const char *s) { serial_puts_dev(s, port); }
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#define INIT_S5P_SERIAL_STRUCTURE(port, name, bus) { \
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name, \
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bus, \
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s5p_serial##port##_init, \
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s5p_serial##port##_setbrg, \
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s5p_serial##port##_getc, \
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s5p_serial##port##_tstc, \
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s5p_serial##port##_putc, \
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s5p_serial##port##_puts, }
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DECLARE_S5P_SERIAL_FUNCTIONS(0);
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struct serial_device s5pc1xx_serial0_device =
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INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0", "S5PUART0");
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DECLARE_S5P_SERIAL_FUNCTIONS(1);
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struct serial_device s5pc1xx_serial1_device =
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INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1", "S5PUART1");
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DECLARE_S5P_SERIAL_FUNCTIONS(2);
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struct serial_device s5pc1xx_serial2_device =
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INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2", "S5PUART2");
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DECLARE_S5P_SERIAL_FUNCTIONS(3);
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struct serial_device s5pc1xx_serial3_device =
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INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3", "S5PUART3");
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