Based on the original S3C64XX UART driver by Samsung for U-Boot 1.1.6.
Signed-off-by: Guennadi Liakhovetski [EMAIL PROTECTED]
---
drivers/serial/Makefile |1 +
drivers/serial/s3c64xx.c | 197 ++
2 files changed, 198 insertions(+), 0 deletions(-)
create mode 100644 drivers/serial/s3c64xx.c
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index de6fbab..b1458f2 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -30,6 +30,7 @@ COBJS-$(CONFIG_MCFUART) += mcfuart.o
COBJS-y += ns9750_serial.o
COBJS-y += ns16550.o
COBJS-$(CONFIG_DRIVER_S3C4510_UART) += s3c4510b_uart.o
+COBJS-$(CONFIG_S3C64XX) += s3c64xx.o
COBJS-y += serial.o
COBJS-$(CONFIG_MAX3100_SERIAL) += serial_max3100.o
COBJS-y += serial_pl010.o
diff --git a/drivers/serial/s3c64xx.c b/drivers/serial/s3c64xx.c
new file mode 100644
index 000..ce0fb91
--- /dev/null
+++ b/drivers/serial/s3c64xx.c
@@ -0,0 +1,197 @@
+/*
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, [EMAIL PROTECTED]
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, [EMAIL PROTECTED]
+ *
+ * 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 s3c6400.h
+
+#ifdef CONFIG_SERIAL1
+#define UART_NRS3C64XX_UART0
+
+#elif defined(CONFIG_SERIAL2)
+#define UART_NRS3C64XX_UART1
+
+#elif defined(CONFIG_SERIAL3)
+#define UART_NRS3C64XX_UART2
+
+#else
+#error Bad: you didn't configure serial ...
+#endif
+
+#define barrier() asm volatile( ::: memory)
+
+/*
+ * The coefficient, used to calculate the baudrate on S3C6400 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,
+ 0x,
+ 0x4924,
+ 0x4a52,
+ 0x54aa,
+ 0x,
+ 0xd555,
+ 0xd5d5,
+ 0xddd5,
+ 0x,
+ 0xdfdd,
+ 0xdfdf,
+ 0xffdf,
+};
+
+void serial_setbrg(void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+ s3c64xx_uart *const uart = s3c64xx_get_base_uart(UART_NR);
+ u32 reg;
+ u32 pclk_ratio = get_PCLK() / gd-baudrate;
+ int i;
+
+ /* PCLK / (16 * baudrate) - 1 */
+ reg = pclk_ratio / 16 - 1;
+ /* i = pclk_ratio % 16 */
+ i = pclk_ratio - (reg + 1) * 16;
+
+ uart-UBRDIV = reg;
+ 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)
+{
+ s3c64xx_uart *const uart = s3c64xx_get_base_uart(UART_NR);
+
+ /* reset and enable FIFOs, set triggers to the maximum */
+ uart-UFCON = 0xff;
+ uart-UMCON = 0;
+ /* 8N1 */
+ uart-ULCON = 3;
+ /* No interrupts, no DMA, pure polling */
+ uart-UCON = 5;
+
+ 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)
+{
+ s3c64xx_uart *const uart = s3c64xx_get_base_uart(UART_NR);
+
+ /* wait for character to arrive */
+ while (!(uart-UTRSTAT 0x1));
+
+ return uart-URXH 0xff;
+}
+
+#ifdef CONFIG_HWFLOW
+static int hwflow; /* turned off by default */
+int hwflow_onoff(int on)
+{
+ switch (on) {
+ 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;
+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)
+{
+ s3c64xx_uart *const uart = s3c64xx_get_base_uart(UART_NR);
+
+#ifdef CONFIG_MODEM_SUPPORT
+ if
