* Code cleanup

* Patch by Sascha Hauer, 28 Jun:
  - add generic support for Motorola i.MX architecture
  - add support for mx1ads, mx1fs2 and scb9328 boards

* Patches by Marc Leeman, 23 Jul 2004:
  - Add define for the PCI/Memory Buffer Configuration Register
  - corrected comments in cpu/mpc824x/cpu_init.c

* Add support for multiple serial interfaces
  (for example to allow modem dial-in / dial-out)

1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/serial_imx.c b/drivers/serial_imx.c
new file mode 100644
index 0000000..9dbaa56
--- /dev/null
+++ b/drivers/serial_imx.c
@@ -0,0 +1,201 @@
+/*
+ * (c) 2004 Sascha Hauer <sascha@saschahauer.de>
+ *
+ * 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>
+#if defined (CONFIG_IMX)
+
+#include <asm/arch/imx-regs.h>
+
+#ifndef CONFIG_IMX_SERIAL_NONE
+
+#if defined CONFIG_IMX_SERIAL1
+#define UART_BASE IMX_UART1_BASE
+#elif defined CONFIG_IMX_SERIAL2
+#define UART_BASE IMX_UART2_BASE
+#else
+#error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE"
+#endif
+
+struct imx_serial {
+	volatile uint32_t urxd[16];
+	volatile uint32_t utxd[16];
+	volatile uint32_t ucr1;
+	volatile uint32_t ucr2;
+	volatile uint32_t ucr3;
+	volatile uint32_t ucr4;
+	volatile uint32_t ufcr;
+	volatile uint32_t usr1;
+	volatile uint32_t usr2;
+	volatile uint32_t uesc;
+	volatile uint32_t utim;
+	volatile uint32_t ubir;
+	volatile uint32_t ubmr;
+	volatile uint32_t ubrc;
+	volatile uint32_t bipr[4];
+	volatile uint32_t bmpr[4];
+	volatile uint32_t uts;
+};
+
+void serial_setbrg (void)
+{
+	serial_init();
+}
+
+extern void imx_gpio_mode(int gpio_mode);
+
+/*
+ * 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)
+{
+	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+#ifdef CONFIG_IMX_SERIAL1
+	imx_gpio_mode(PC11_PF_UART1_TXD);
+	imx_gpio_mode(PC12_PF_UART1_RXD);
+#else
+	imx_gpio_mode(PB30_PF_UART2_TXD);
+	imx_gpio_mode(PB31_PF_UART2_RXD);
+#endif
+
+	/* Disable UART */
+	base->ucr1 &= ~UCR1_UARTEN;
+
+	/* Set to default POR state */
+
+	base->ucr1 = 0x00000004;
+	base->ucr2 = 0x00000000;
+	base->ucr3 = 0x00000000;
+	base->ucr4 = 0x00008040;
+	base->uesc = 0x0000002B;
+	base->utim = 0x00000000;
+	base->ubir = 0x00000000;
+	base->ubmr = 0x00000000;
+	base->uts  = 0x00000000;
+	/* Set clocks */
+	base->ucr4 |= UCR4_REF16;
+
+	/* Configure FIFOs */
+	base->ufcr = 0xa81;
+
+	/* Set the numerator value minus one of the BRM ratio */
+	base->ubir = (CONFIG_BAUDRATE / 100) - 1;
+
+	/* Set the denominator value minus one of the BRM ratio	*/
+	base->ubmr = 10000 - 1;
+
+	/* Set to 8N1 */
+	base->ucr2 &= ~UCR2_PREN;
+	base->ucr2 |= UCR2_WS;
+	base->ucr2 &= ~UCR2_STPB;
+
+	/* Ignore RTS */
+	base->ucr2 |= UCR2_IRTS;
+
+	/* Enable UART */
+	base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN;
+
+	/* Enable FIFOs */
+	base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;
+
+  	/* Clear status flags */
+	base->usr2 |= USR2_ADET  |
+	          USR2_DTRF  |
+	          USR2_IDLE  |
+	          USR2_IRINT |
+	          USR2_WAKE  |
+	          USR2_RTSF  |
+	          USR2_BRCD  |
+	          USR2_ORE   |
+	          USR2_RDR;
+
+  	/* Clear status flags */
+	base->usr1 |= USR1_PARITYERR |
+	          USR1_RTSD      |
+	          USR1_ESCF      |
+	          USR1_FRAMERR   |
+	          USR1_AIRINT    |
+	          USR1_AWAKE;
+	return (0);
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is successful, the character read is
+ * written into its argument c.
+ */
+int serial_getc (void)
+{
+	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+	unsigned char ch;
+
+	while(base->uts & UTS_RXEMPTY);
+
+	ch = (char)base->urxd[0];
+
+	return ch;
+}
+
+#ifdef CONFIG_HWFLOW
+static int hwflow = 0; /* turned off by default */
+int hwflow_onoff(int on)
+{
+}
+#endif
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+
+	/* Wait for Tx FIFO not full */
+	while (base->uts & UTS_TXFULL);
+
+	base->utxd[0] = c;
+
+	/* If \n, also do \r */
+	if (c == '\n')
+		serial_putc ('\r');
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+int serial_tstc (void)
+{
+	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+
+	/* If receive fifo is empty, return false */
+	if (base->uts & UTS_RXEMPTY)
+		return 0;
+	return 1;
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+#endif /* CONFIG_IMX_SERIAL_NONE */
+#endif /* defined CONFIG_IMX */