serial: Add vcth UART driver

This patch adds the UART driver for the upcoming VCTH board support.

Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index eafe543e36ea83cc82560a8a987da78555f26695..17235ff17838bb3ee81f973d72f9446fbff6ae9d 100644 (file)
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -38,6 +38,7 @@ COBJS-$(CONFIG_PL011_SERIAL) += serial_pl01x.o
 COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
 COBJS-$(CONFIG_USB_TTY) += usbtty.o
+COBJS-$(CONFIG_VCTH_SERIAL) += vcth.o
 
 COBJS  := $(sort $(COBJS-y))
 SRCS   := $(COBJS:.o=.c)

diff --git a/drivers/serial/vcth.c b/drivers/serial/vcth.c
new file mode 100755 (executable)
index 0000000..2c847d0
--- /dev/null
+++ b/drivers/serial/vcth.c
@@ -0,0 +1,121 @@
+/*
+ * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <asm/io.h>
+
+#define UART_1_BASE            0xBF89C000
+
+#define        UART_RBR_OFF            0x00    /* receiver buffer reg          */
+#define        UART_THR_OFF            0x00    /* transmit holding  reg        */
+#define        UART_DLL_OFF            0x00    /* divisor latch low reg        */
+#define        UART_IER_OFF            0x04    /* interrupt enable reg         */
+#define        UART_DLH_OFF            0x04    /* receiver buffer reg          */
+#define        UART_FCR_OFF            0x08    /* fifo control register        */
+#define        UART_LCR_OFF            0x0c    /* line control register        */
+#define        UART_MCR_OFF            0x10    /* modem control register       */
+#define        UART_LSR_OFF            0x14    /* line status register         */
+#define        UART_MSR_OFF            0x18    /* modem status register        */
+#define        UART_SCR_OFF            0x1c    /* scratch pad register         */
+
+#define UART_RCV_DATA_RDY      0x01    /* Data Received                */
+#define UART_XMT_HOLD_EMPTY    0x20
+#define UART_TRANSMIT_EMPTY    0x40
+
+/* 7 bit on line control reg. enalbing rw to dll and dlh */
+#define UART_LCR_DLAB          0x0080
+
+#define UART___9600_BDR                0x84
+#define UART__19200_BDR                0x42
+#define UART_115200_BDR                0x08
+
+#define UART_DIS_ALL_INTER     0x00    /* disable all interrupts       */
+
+#define UART_5DATA_BITS                0x0000  /*   5 [bits]  1.5 bits   2     */
+#define UART_6DATA_BITS                0x0001  /*   6 [bits]  1   bits   2     */
+#define UART_7DATA_BITS                0x0002  /*   7 [bits]  1   bits   2     */
+#define UART_8DATA_BITS                0x0003  /*   8 [bits]  1   bits   2     */
+
+static void vcth_uart_set_baud_rate(u32 address, u32 dh, u32 dl)
+{
+       u32 val = __raw_readl(UART_1_BASE + UART_LCR_OFF);
+
+       /* set 7 bit on 1 */
+       val |= UART_LCR_DLAB;
+       __raw_writel(val, UART_1_BASE + UART_LCR_OFF);
+
+       __raw_writel(dl, UART_1_BASE + UART_DLL_OFF);
+       __raw_writel(dh, UART_1_BASE + UART_DLH_OFF);
+
+       /* set 7 bit on 0 */
+       val &= ~UART_LCR_DLAB;
+       __raw_writel(val, UART_1_BASE + UART_LCR_OFF);
+
+       return;
+}
+
+int serial_init(void)
+{
+       __raw_writel(UART_DIS_ALL_INTER, UART_1_BASE + UART_IER_OFF);
+       vcth_uart_set_baud_rate(UART_1_BASE, 0, UART_115200_BDR);
+       __raw_writel(UART_8DATA_BITS, UART_1_BASE + UART_LCR_OFF);
+
+       return 0;
+}
+
+void serial_setbrg(void)
+{
+       /*
+        * Baudrate change not supported currently, fixed to 115200 baud
+        */
+}
+
+void serial_putc(const char c)
+{
+       if (c == '\n')
+               serial_putc('\r');
+
+       while (!(UART_XMT_HOLD_EMPTY & __raw_readl(UART_1_BASE + UART_LSR_OFF)))
+               ;
+
+       __raw_writel(c, UART_1_BASE + UART_THR_OFF);
+}
+
+void serial_puts(const char *s)
+{
+       while (*s)
+               serial_putc(*s++);
+}
+
+int serial_getc(void)
+{
+       while (!(UART_RCV_DATA_RDY & __raw_readl(UART_1_BASE + UART_LSR_OFF)))
+               ;
+
+       return __raw_readl(UART_1_BASE + UART_RBR_OFF) & 0xff;
+}
+
+int serial_tstc(void)
+{
+       if (!(UART_RCV_DATA_RDY & __raw_readl(UART_1_BASE + UART_LSR_OFF)))
+               return 0;
+
+       return 1;
+}