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![Wolfgang Denk](/assets/img/avatar_default.png)
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
302 lines
6.9 KiB
C
302 lines
6.9 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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <fdtdec.h>
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#include <linux/compiler.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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DECLARE_GLOBAL_DATA_PTR;
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#define RX_FIFO_COUNT_MASK 0xff
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#define RX_FIFO_FULL_MASK (1 << 8)
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#define TX_FIFO_FULL_MASK (1 << 24)
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/* Information about a serial port */
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struct fdt_serial {
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u32 base_addr; /* address of registers in physical memory */
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u8 port_id; /* uart port number */
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u8 enabled; /* 1 if enabled, 0 if disabled */
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} config __attribute__ ((section(".data")));
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static inline struct s5p_uart *s5p_get_base_uart(int dev_index)
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{
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#ifdef CONFIG_OF_CONTROL
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return (struct s5p_uart *)(config.base_addr);
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#else
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u32 offset = dev_index * sizeof(struct s5p_uart);
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return (struct s5p_uart *)(samsung_get_base_uart() + offset);
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#endif
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}
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/*
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* The coefficient, used to calculate the baudrate on S5P 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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struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
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u32 uclk = get_uart_clk(dev_index);
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u32 baudrate = gd->baudrate;
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u32 val;
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#if defined(CONFIG_SILENT_CONSOLE) && \
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defined(CONFIG_OF_CONTROL) && \
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!defined(CONFIG_SPL_BUILD)
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if (fdtdec_get_config_int(gd->fdt_blob, "silent_console", 0))
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gd->flags |= GD_FLG_SILENT;
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#endif
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if (!config.enabled)
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return;
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val = uclk / baudrate;
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writel(val / 16 - 1, &uart->ubrdiv);
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if (s5p_uart_divslot())
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writew(udivslot[val % 16], &uart->rest.slot);
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else
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writeb(val % 16, &uart->rest.value);
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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 s5p_uart *const uart = s5p_get_base_uart(dev_index);
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/* enable FIFOs */
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writel(0x1, &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, int op)
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{
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struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
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unsigned int mask;
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/*
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* UERSTAT
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* Break Detect [3]
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* Frame Err [2] : receive operation
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* Parity Err [1] : receive operation
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* Overrun Err [0] : receive operation
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*/
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if (op)
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mask = 0x8;
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else
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mask = 0xf;
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return readl(&uart->uerstat) & mask;
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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 s5p_uart *const uart = s5p_get_base_uart(dev_index);
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if (!config.enabled)
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return 0;
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/* wait for character to arrive */
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while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
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RX_FIFO_FULL_MASK))) {
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if (serial_err_check(dev_index, 0))
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return 0;
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}
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return (int)(readb(&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 s5p_uart *const uart = s5p_get_base_uart(dev_index);
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if (!config.enabled)
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return;
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/* wait for room in the tx FIFO */
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while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
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if (serial_err_check(dev_index, 1))
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return;
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}
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writeb(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 s5p_uart *const uart = s5p_get_base_uart(dev_index);
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if (!config.enabled)
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return 0;
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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) { \
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.name = __name, \
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.start = s5p_serial##port##_init, \
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.stop = NULL, \
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.setbrg = s5p_serial##port##_setbrg, \
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.getc = s5p_serial##port##_getc, \
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.tstc = s5p_serial##port##_tstc, \
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.putc = s5p_serial##port##_putc, \
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.puts = s5p_serial##port##_puts, \
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}
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DECLARE_S5P_SERIAL_FUNCTIONS(0);
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struct serial_device s5p_serial0_device =
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INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0");
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DECLARE_S5P_SERIAL_FUNCTIONS(1);
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struct serial_device s5p_serial1_device =
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INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1");
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DECLARE_S5P_SERIAL_FUNCTIONS(2);
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struct serial_device s5p_serial2_device =
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INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2");
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DECLARE_S5P_SERIAL_FUNCTIONS(3);
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struct serial_device s5p_serial3_device =
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INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3");
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#ifdef CONFIG_OF_CONTROL
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int fdtdec_decode_console(int *index, struct fdt_serial *uart)
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{
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const void *blob = gd->fdt_blob;
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int node;
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node = fdt_path_offset(blob, "console");
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if (node < 0)
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return node;
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uart->base_addr = fdtdec_get_addr(blob, node, "reg");
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if (uart->base_addr == FDT_ADDR_T_NONE)
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return -FDT_ERR_NOTFOUND;
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uart->port_id = fdtdec_get_int(blob, node, "id", -1);
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uart->enabled = fdtdec_get_is_enabled(blob, node);
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return 0;
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}
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#endif
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__weak struct serial_device *default_serial_console(void)
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{
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#ifdef CONFIG_OF_CONTROL
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int index = 0;
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if ((!config.base_addr) && (fdtdec_decode_console(&index, &config))) {
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debug("Cannot decode default console node\n");
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return NULL;
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}
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switch (config.port_id) {
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case 0:
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return &s5p_serial0_device;
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case 1:
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return &s5p_serial1_device;
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case 2:
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return &s5p_serial2_device;
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case 3:
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return &s5p_serial3_device;
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default:
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debug("Unknown config.port_id: %d", config.port_id);
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break;
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}
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return NULL;
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#else
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config.enabled = 1;
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#if defined(CONFIG_SERIAL0)
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return &s5p_serial0_device;
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#elif defined(CONFIG_SERIAL1)
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return &s5p_serial1_device;
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#elif defined(CONFIG_SERIAL2)
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return &s5p_serial2_device;
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#elif defined(CONFIG_SERIAL3)
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return &s5p_serial3_device;
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#else
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#error "CONFIG_SERIAL? missing."
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#endif
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#endif
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}
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void s5p_serial_initialize(void)
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{
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serial_register(&s5p_serial0_device);
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serial_register(&s5p_serial1_device);
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serial_register(&s5p_serial2_device);
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serial_register(&s5p_serial3_device);
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}
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