[U-Boot] [PATCH 1/5] msm7x30: Add support for low speed uart on msm7x30

mohamed.haneef at lntinfotech.com
2012-02-16T02:59:19Z

From: Mohamed Haneef <mohamed.haneef@lntinfotech.com>

* Support for low speed uart

Signed-off-by: Mohamed Haneef <mohamed.haneef@lntinfotech.com>
---
drivers/serial/Makefile | 1 +
drivers/serial/serial_msm_uart.c | 206 ++++++++++++++++++++++++++++++++++++++
2 files changed, 207 insertions(+), 0 deletions(-)
create mode 100644 drivers/serial/serial_msm_uart.c

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 616b857..2801edc 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -55,6 +55,7 @@ COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o
COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
COBJS-$(CONFIG_SANDBOX_SERIAL) += sandbox.o
COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o
+COBJS-$(CONFIG_MSM_UART) += serial_msm_uart.o

ifndef CONFIG_SPL_BUILD
COBJS-$(CONFIG_USB_TTY) += usbtty.o
diff --git a/drivers/serial/serial_msm_uart.c b/drivers/serial/serial_msm_uart.c
new file mode 100644
index 0000000..8cafa7a
--- /dev/null
+++ b/drivers/serial/serial_msm_uart.c
@@ -0,0 +1,206 @@
+/*
+ * (C) Copyright 2012
+ * LARSEN & TOUBRO INFOTECH LTD <www.lntinfotech.com>
+ *
+ * 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 <asm/arch/iomap.h>
+#include <asm/io.h>
+#include <asm/types.h>
+
+#define UART_MR1 0x0000
+
+#define UART_MR1_AUTO_RFR_LEVEL0(n) (((n) & 0x3f) << 8)
+#define UART_MR1_RX_RDY_CTL (1 << 7)
+#define UART_MR1_CTS_CTL (1 << 6)
+#define UART_MR1_AUTO_RFR_LEVEL1(n) ((n) & 0x3f)
+
+#define UART_MR2 0x0004
+#define UART_MR2_ERROR_MODE (1 << 6)
+#define UART_MR2_BITS_PER_CHAR_5 (0 << 4)
+#define UART_MR2_BITS_PER_CHAR_6 (1 << 4)
+#define UART_MR2_BITS_PER_CHAR_7 (2 << 4)
+#define UART_MR2_BITS_PER_CHAR_8 (3 << 4)
+#define UART_MR2_STOP_BIT_LEN_0563 (0 << 2)
+#define UART_MR2_STOP_BIT_LEN_1000 (1 << 2)
+#define UART_MR2_STOP_BIT_LEN_1563 (2 << 2)
+#define UART_MR2_STOP_BIT_LEN_2000 (3 << 2)
+#define UART_MR2_PARITY_MODE_NONE (0)
+#define UART_MR2_PARITY_MODE_ODD (1)
+#define UART_MR2_PARITY_MODE_EVEN (2)
+#define UART_MR2_PARITY_MODE_SPACE (3)
+
+#define UART_CSR 0x0008
+#define UART_CSR_115200 0xFF
+#define UART_CSR_57600 0xEE
+#define UART_CSR_38400 0xDD
+#define UART_CSR_19200 0xBB
+
+#define UART_TF 0x000C
+
+#define UART_CR 0x0010
+#define UART_CR_CMD_NULL (0 << 4)
+#define UART_CR_CMD_RESET_RX (1 << 4)
+#define UART_CR_CMD_RESET_TX (2 << 4)
+#define UART_CR_CMD_RESET_ERR (3 << 4)
+#define UART_CR_CMD_RESET_BCI (4 << 4)
+#define UART_CR_CMD_START_BREAK (5 << 4)
+#define UART_CR_CMD_STOP_BREAK (6 << 4)
+#define UART_CR_CMD_RESET_CTS_N (7 << 4)
+#define UART_CR_CMD_PACKET_MODE (9 << 4)
+#define UART_CR_CMD_MODE_RESET (12 << 4)
+#define UART_CR_CMD_SET_RFR_N (13 << 4)
+#define UART_CR_CMD_RESET_RFR_ND (14 << 4)
+#define UART_CR_TX_DISABLE (1 << 3)
+#define UART_CR_TX_ENABLE (1 << 3)
+#define UART_CR_RX_DISABLE (1 << 3)
+#define UART_CR_RX_ENABLE (1 << 3)
+
+#define UART_IMR 0x0014
+#define UART_IMR_RXLEV (1 << 4)
+#define UART_IMR_TXLEV (1 << 0)
+
+#define UART_IPR 0x0018
+#define UART_TFWR 0x001C
+#define UART_RFWR 0x0020
+#define UART_HCR 0x0024
+
+#define UART_MREG 0x0028
+#define UART_NREG 0x002C
+#define UART_DREG 0x0030
+#define UART_MNDREG 0x0034
+#define UART_IRDA 0x0038
+#define UART_MISR_MODE 0x0040
+#define UART_MISR_RESET 0x0044
+#define UART_MISR_EXPORT 0x0048
+#define UART_MISR_VAL 0x004C
+#define UART_TEST_CTRL 0x0050
+
+#define UART_SR 0x0008
+#define UART_SR_HUNT_CHAR (1 << 7)
+#define UART_SR_RX_BREAK (1 << 6)
+#define UART_SR_PAR_FRAME_ERR (1 << 5)
+#define UART_SR_OVERRUN (1 << 4)
+#define UART_SR_TX_EMPTY (1 << 3)
+#define UART_SR_TX_READY (1 << 2)
+#define UART_SR_RX_FULL (1 << 1)
+#define UART_SR_RX_READY (1 << 0)
+
+#define UART_RF 0x000C
+#define UART_MISR 0x0010
+#define UART_ISR 0x0014
+
+
+#if PLATFORM_MSM7X30
+static unsigned uart_base = MSM_UART2_BASE;
+#elif PLATFORM_MSM7X27A
+static unsigned uart_base = MSM_UART1_BASE;
+#else
+static unsigned uart_base = MSM_UART3_BASE;
+#endif
+
+#define uwr(v, a) writel(v, uart_base + (a))
+#define urd(a) readl(uart_base + (a))
+
+void uart_init(void)
+{
+ uwr(0x0A, UART_CR); /* disable TX and RX */
+ uwr(0x30, UART_CR); /* reset error status */
+ uwr(0x10, UART_CR); /* reset receiver */
+ uwr(0x20, UART_CR); /* reset transmitter */
+#if PLATFORM_QSD8K || PLATFORM_MSM7X30 || PLATFORM_MSM7X27A
+ /* TCXO */
+ uwr(0x06, UART_MREG);
+ uwr(0xF1, UART_NREG);
+ uwr(0x0F, UART_DREG);
+ uwr(0x1A, UART_MNDREG);
+#else
+ /* TCXO/4 */
+ uwr(0xC0, UART_MREG);
+ uwr(0xAF, UART_NREG);
+ uwr(0x80, UART_DREG);
+ uwr(0x19, UART_MNDREG);
+#endif
+ uwr(0x10, UART_CR); /* reset RX */
+ uwr(0x20, UART_CR); /* reset TX */
+ uwr(0x30, UART_CR); /* reset error status */
+ uwr(0x40, UART_CR); /* reset RX break */
+ uwr(0x70, UART_CR); /* rest? */
+ uwr(0xD0, UART_CR); /* reset */
+ uwr(0x7BF, UART_IPR); /* stale timeout = 630 * bitrate */
+ uwr(0, UART_IMR);
+ uwr(115, UART_RFWR); /* RX watermark = 58 * 2 - 1 */
+ uwr(10, UART_TFWR); /* TX watermark */
+ uwr(0, UART_RFWR);
+ uwr(UART_CSR_115200, UART_CSR);
+ uwr(0, UART_IRDA);
+ uwr(0x1E, UART_HCR);
+ uwr(16, UART_MR1);
+ uwr(0x34, UART_MR2); /* 8N1 */
+ uwr(0x05, UART_CR); /* enable TX & RX */
+
+}
+
+static int _uart_putc(int port, char c)
+{
+ while (!(urd(UART_SR) & UART_SR_TX_READY))
+ ;
+ uwr(c, UART_TF);
+ return 0;
+}
+
+int serial_init(void)
+{
+ uart_init();
+ return 0;
+}
+
+void serial_putc(char c)
+{
+ if (c == '\n')
+ _uart_putc(0, '\r');
+ _uart_putc(0, c);
+}
+
+void serial_putc_raw(const char c)
+{
+ _uart_putc(0, c);
+}
+
+void serial_puts(const char *s)
+{
+ while (*s)
+ serial_putc(*s++);
+}
+
+int serial_getc()
+{
+ while (!(urd(UART_SR) & UART_SR_RX_READY))
+ ;
+ return urd(UART_RF);
+}
+
+int serial_tstc()
+{
+ return urd(UART_SR) & UART_SR_RX_READY;
+}
+
+void serial_setbrg()
+{
+}
+
--
1.7.1

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