--- /dev/null
+/*
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/compiler.h>
+#include <asm/arch/s3c24x0_cpu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SERIAL1
+#define UART_NR S3C24X0_UART0
+
+#elif defined(CONFIG_SERIAL2)
+#define UART_NR S3C24X0_UART1
+
+#elif defined(CONFIG_SERIAL3)
+#define UART_NR S3C24X0_UART2
+
+#else
+#error "Bad: you didn't configure serial ..."
+#endif
+
+#include <asm/io.h>
+#include <serial.h>
+
+/* Multi serial device functions */
+#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
+ int s3serial##port##_init(void) \
+ { \
+ return serial_init_dev(port); \
+ } \
+ void s3serial##port##_setbrg(void) \
+ { \
+ serial_setbrg_dev(port); \
+ } \
+ int s3serial##port##_getc(void) \
+ { \
+ return serial_getc_dev(port); \
+ } \
+ int s3serial##port##_tstc(void) \
+ { \
+ return serial_tstc_dev(port); \
+ } \
+ void s3serial##port##_putc(const char c) \
+ { \
+ serial_putc_dev(port, c); \
+ } \
+ void s3serial##port##_puts(const char *s) \
+ { \
+ serial_puts_dev(port, s); \
+ }
+
+#define INIT_S3C_SERIAL_STRUCTURE(port, __name) { \
+ .name = __name, \
+ .start = s3serial##port##_init, \
+ .stop = NULL, \
+ .setbrg = s3serial##port##_setbrg, \
+ .getc = s3serial##port##_getc, \
+ .tstc = s3serial##port##_tstc, \
+ .putc = s3serial##port##_putc, \
+ .puts = s3serial##port##_puts, \
+}
+
+#ifdef CONFIG_HWFLOW
+static int hwflow;
+#endif
+
+void _serial_setbrg(const int dev_index)
+{
+ struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
+ unsigned int reg = 0;
+ int i;
+
+ /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
+ reg = get_PCLK() / (16 * gd->baudrate) - 1;
+
+ writel(reg, &uart->ubrdiv);
+ for (i = 0; i < 100; i++)
+ /* Delay */ ;
+}
+
+static inline void serial_setbrg_dev(unsigned int dev_index)
+{
+ _serial_setbrg(dev_index);
+}
+
+/* Initialise the serial port. 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 s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
+
+#ifdef CONFIG_HWFLOW
+ hwflow = 0; /* turned off by default */
+#endif
+
+ /* FIFO enable, Tx/Rx FIFO clear */
+ writel(0x07, &uart->ufcon);
+ writel(0x0, &uart->umcon);
+
+ /* Normal,No parity,1 stop,8 bit */
+ writel(0x3, &uart->ulcon);
+ /*
+ * tx=level,rx=edge,disable timeout int.,enable rx error int.,
+ * normal,interrupt or polling
+ */
+ writel(0x245, &uart->ucon);
+
+#ifdef CONFIG_HWFLOW
+ writel(0x1, &uart->umcon); /* rts up */
+#endif
+
+ /* FIXME: This is sooooooooooooooooooo ugly */
+#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
+ /* we need auto hw flow control on the gsm and gps port */
+ if (dev_index == 0 || dev_index == 1)
+ writel(0x10, &uart->umcon);
+#endif
+ _serial_setbrg(dev_index);
+
+ 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(const int dev_index)
+{
+ struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
+
+ while (!(readl(&uart->utrstat) & 0x1))
+ /* wait for character to arrive */ ;
+
+ return readb(&uart->urxh) & 0xff;
+}
+
+static inline int serial_getc_dev(unsigned int dev_index)
+{
+ return _serial_getc(dev_index);
+}
+
+#ifdef CONFIG_HWFLOW
+int hwflow_onoff(int on)
+{
+ switch (on) {
+ case 0:
+ default:
+ break; /* return current */
+ case 1:
+ hwflow = 1; /* turn on */
+ break;
+ case -1:
+ hwflow = 0; /* turn off */
+ break;
+ }
+ return hwflow;
+}
+#endif
+
+#ifdef CONFIG_MODEM_SUPPORT
+static int be_quiet = 0;
+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, const int dev_index)
+{
+ struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
+#ifdef CONFIG_MODEM_SUPPORT
+ if (be_quiet)
+ return;
+#endif
+
+ while (!(readl(&uart->utrstat) & 0x2))
+ /* wait for room in the tx FIFO */ ;
+
+#ifdef CONFIG_HWFLOW
+ while (hwflow && !(readl(&uart->umstat) & 0x1))
+ /* Wait for CTS up */ ;
+#endif
+
+ writeb(c, &uart->utxh);
+
+ /* If \n, also do \r */
+ if (c == '\n')
+ serial_putc('\r');
+}
+
+static inline void serial_putc_dev(unsigned int dev_index, const char c)
+{
+ _serial_putc(c, dev_index);
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+int _serial_tstc(const int dev_index)
+{
+ struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
+
+ return readl(&uart->utrstat) & 0x1;
+}
+
+static inline int serial_tstc_dev(unsigned int dev_index)
+{
+ return _serial_tstc(dev_index);
+}
+
+void _serial_puts(const char *s, const int dev_index)
+{
+ while (*s) {
+ _serial_putc(*s++, dev_index);
+ }
+}
+
+static inline void serial_puts_dev(int dev_index, const char *s)
+{
+ _serial_puts(s, dev_index);
+}
+
+DECLARE_S3C_SERIAL_FUNCTIONS(0);
+struct serial_device s3c24xx_serial0_device =
+INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0");
+DECLARE_S3C_SERIAL_FUNCTIONS(1);
+struct serial_device s3c24xx_serial1_device =
+INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1");
+DECLARE_S3C_SERIAL_FUNCTIONS(2);
+struct serial_device s3c24xx_serial2_device =
+INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2");
+
+__weak struct serial_device *default_serial_console(void)
+{
+#if defined(CONFIG_SERIAL1)
+ return &s3c24xx_serial0_device;
+#elif defined(CONFIG_SERIAL2)
+ return &s3c24xx_serial1_device;
+#elif defined(CONFIG_SERIAL3)
+ return &s3c24xx_serial2_device;
+#else
+#error "CONFIG_SERIAL? missing."
+#endif
+}
+
+void s3c24xx_serial_initialize(void)
+{
+ serial_register(&s3c24xx_serial0_device);
+ serial_register(&s3c24xx_serial1_device);
+ serial_register(&s3c24xx_serial2_device);
+}
Code Review / kvmfornfv.git / blobdiff