imx31: move serial driver to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

2 files changed, 227 insertions, 0 deletions

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index e76a2ad..619d9da 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -35,6 +35,7 @@ COBJS-$(CONFIG_S3C64XX) += s3c64xx.o
 COBJS-$(CONFIG_SYS_NS16550_SERIAL) += serial.o
 COBJS-$(CONFIG_IXP_SERIAL) += serial_ixp.o
 COBJS-$(CONFIG_MAX3100_SERIAL) += serial_max3100.o
+COBJS-$(CONFIG_MX31_UART) += serial_mx31.o
 COBJS-$(CONFIG_NETARM_SERIAL) += serial_netarm.o
 COBJS-$(CONFIG_PL010_SERIAL) += serial_pl01x.o
 COBJS-$(CONFIG_PL011_SERIAL) += serial_pl01x.o
diff --git a/drivers/serial/serial_mx31.c b/drivers/serial/serial_mx31.c
new file mode 100644
index 0000000..7c0682a
--- /dev/null
+++ b/drivers/serial/serial_mx31.c
@@ -0,0 +1,226 @@
+/*
+ * (c) 2007 Sascha Hauer <s.hauer@pengutronix.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>
+#include <asm/arch/mx31.h>
+
+#define __REG(x)     (*((volatile u32 *)(x)))
+
+#ifdef CONFIG_SYS_MX31_UART1
+#define UART_PHYS 0x43f90000
+#elif defined(CONFIG_SYS_MX31_UART2)
+#define UART_PHYS 0x43f94000
+#elif defined(CONFIG_SYS_MX31_UART3)
+#define UART_PHYS 0x5000c000
+#elif defined(CONFIG_SYS_MX31_UART4)
+#define UART_PHYS 0x43fb0000
+#elif defined(CONFIG_SYS_MX31_UART5)
+#define UART_PHYS 0x43fb4000
+#else
+#error "define CONFIG_SYS_MX31_UARTx to use the mx31 UART driver"
+#endif
+
+/* Register definitions */
+#define URXD  0x0  /* Receiver Register */
+#define UTXD  0x40 /* Transmitter Register */
+#define UCR1  0x80 /* Control Register 1 */
+#define UCR2  0x84 /* Control Register 2 */
+#define UCR3  0x88 /* Control Register 3 */
+#define UCR4  0x8c /* Control Register 4 */
+#define UFCR  0x90 /* FIFO Control Register */
+#define USR1  0x94 /* Status Register 1 */
+#define USR2  0x98 /* Status Register 2 */
+#define UESC  0x9c /* Escape Character Register */
+#define UTIM  0xa0 /* Escape Timer Register */
+#define UBIR  0xa4 /* BRM Incremental Register */
+#define UBMR  0xa8 /* BRM Modulator Register */
+#define UBRC  0xac /* Baud Rate Count Register */
+#define UTS   0xb4 /* UART Test Register (mx31) */
+
+/* UART Control Register Bit Fields.*/
+#define  URXD_CHARRDY    (1<<15)
+#define  URXD_ERR        (1<<14)
+#define  URXD_OVRRUN     (1<<13)
+#define  URXD_FRMERR     (1<<12)
+#define  URXD_BRK        (1<<11)
+#define  URXD_PRERR      (1<<10)
+#define  URXD_RX_DATA    (0xFF)
+#define  UCR1_ADEN       (1<<15) /* Auto dectect interrupt */
+#define  UCR1_ADBR       (1<<14) /* Auto detect baud rate */
+#define  UCR1_TRDYEN     (1<<13) /* Transmitter ready interrupt enable */
+#define  UCR1_IDEN       (1<<12) /* Idle condition interrupt */
+#define  UCR1_RRDYEN     (1<<9)	 /* Recv ready interrupt enable */
+#define  UCR1_RDMAEN     (1<<8)	 /* Recv ready DMA enable */
+#define  UCR1_IREN       (1<<7)	 /* Infrared interface enable */
+#define  UCR1_TXMPTYEN   (1<<6)	 /* Transimitter empty interrupt enable */
+#define  UCR1_RTSDEN     (1<<5)	 /* RTS delta interrupt enable */
+#define  UCR1_SNDBRK     (1<<4)	 /* Send break */
+#define  UCR1_TDMAEN     (1<<3)	 /* Transmitter ready DMA enable */
+#define  UCR1_UARTCLKEN  (1<<2)	 /* UART clock enabled */
+#define  UCR1_DOZE       (1<<1)	 /* Doze */
+#define  UCR1_UARTEN     (1<<0)	 /* UART enabled */
+#define  UCR2_ESCI	 (1<<15) /* Escape seq interrupt enable */
+#define  UCR2_IRTS	 (1<<14) /* Ignore RTS pin */
+#define  UCR2_CTSC	 (1<<13) /* CTS pin control */
+#define  UCR2_CTS        (1<<12) /* Clear to send */
+#define  UCR2_ESCEN      (1<<11) /* Escape enable */
+#define  UCR2_PREN       (1<<8)  /* Parity enable */
+#define  UCR2_PROE       (1<<7)  /* Parity odd/even */
+#define  UCR2_STPB       (1<<6)	 /* Stop */
+#define  UCR2_WS         (1<<5)	 /* Word size */
+#define  UCR2_RTSEN      (1<<4)	 /* Request to send interrupt enable */
+#define  UCR2_TXEN       (1<<2)	 /* Transmitter enabled */
+#define  UCR2_RXEN       (1<<1)	 /* Receiver enabled */
+#define  UCR2_SRST	 (1<<0)	 /* SW reset */
+#define  UCR3_DTREN	 (1<<13) /* DTR interrupt enable */
+#define  UCR3_PARERREN   (1<<12) /* Parity enable */
+#define  UCR3_FRAERREN   (1<<11) /* Frame error interrupt enable */
+#define  UCR3_DSR        (1<<10) /* Data set ready */
+#define  UCR3_DCD        (1<<9)  /* Data carrier detect */
+#define  UCR3_RI         (1<<8)  /* Ring indicator */
+#define  UCR3_TIMEOUTEN  (1<<7)  /* Timeout interrupt enable */
+#define  UCR3_RXDSEN	 (1<<6)  /* Receive status interrupt enable */
+#define  UCR3_AIRINTEN   (1<<5)  /* Async IR wake interrupt enable */
+#define  UCR3_AWAKEN	 (1<<4)  /* Async wake interrupt enable */
+#define  UCR3_REF25	 (1<<3)  /* Ref freq 25 MHz */
+#define  UCR3_REF30	 (1<<2)  /* Ref Freq 30 MHz */
+#define  UCR3_INVT	 (1<<1)  /* Inverted Infrared transmission */
+#define  UCR3_BPEN	 (1<<0)  /* Preset registers enable */
+#define  UCR4_CTSTL_32   (32<<10) /* CTS trigger level (32 chars) */
+#define  UCR4_INVR	 (1<<9)  /* Inverted infrared reception */
+#define  UCR4_ENIRI	 (1<<8)  /* Serial infrared interrupt enable */
+#define  UCR4_WKEN	 (1<<7)  /* Wake interrupt enable */
+#define  UCR4_REF16	 (1<<6)  /* Ref freq 16 MHz */
+#define  UCR4_IRSC	 (1<<5)  /* IR special case */
+#define  UCR4_TCEN	 (1<<3)  /* Transmit complete interrupt enable */
+#define  UCR4_BKEN	 (1<<2)  /* Break condition interrupt enable */
+#define  UCR4_OREN	 (1<<1)  /* Receiver overrun interrupt enable */
+#define  UCR4_DREN	 (1<<0)  /* Recv data ready interrupt enable */
+#define  UFCR_RXTL_SHF   0       /* Receiver trigger level shift */
+#define  UFCR_RFDIV      (7<<7)  /* Reference freq divider mask */
+#define  UFCR_TXTL_SHF   10      /* Transmitter trigger level shift */
+#define  USR1_PARITYERR  (1<<15) /* Parity error interrupt flag */
+#define  USR1_RTSS	 (1<<14) /* RTS pin status */
+#define  USR1_TRDY	 (1<<13) /* Transmitter ready interrupt/dma flag */
+#define  USR1_RTSD	 (1<<12) /* RTS delta */
+#define  USR1_ESCF	 (1<<11) /* Escape seq interrupt flag */
+#define  USR1_FRAMERR    (1<<10) /* Frame error interrupt flag */
+#define  USR1_RRDY       (1<<9)	 /* Receiver ready interrupt/dma flag */
+#define  USR1_TIMEOUT    (1<<7)	 /* Receive timeout interrupt status */
+#define  USR1_RXDS	 (1<<6)	 /* Receiver idle interrupt flag */
+#define  USR1_AIRINT	 (1<<5)	 /* Async IR wake interrupt flag */
+#define  USR1_AWAKE	 (1<<4)	 /* Aysnc wake interrupt flag */
+#define  USR2_ADET	 (1<<15) /* Auto baud rate detect complete */
+#define  USR2_TXFE	 (1<<14) /* Transmit buffer FIFO empty */
+#define  USR2_DTRF	 (1<<13) /* DTR edge interrupt flag */
+#define  USR2_IDLE	 (1<<12) /* Idle condition */
+#define  USR2_IRINT	 (1<<8)	 /* Serial infrared interrupt flag */
+#define  USR2_WAKE	 (1<<7)	 /* Wake */
+#define  USR2_RTSF	 (1<<4)	 /* RTS edge interrupt flag */
+#define  USR2_TXDC	 (1<<3)	 /* Transmitter complete */
+#define  USR2_BRCD	 (1<<2)	 /* Break condition */
+#define  USR2_ORE        (1<<1)	 /* Overrun error */
+#define  USR2_RDR        (1<<0)	 /* Recv data ready */
+#define  UTS_FRCPERR	 (1<<13) /* Force parity error */
+#define  UTS_LOOP        (1<<12) /* Loop tx and rx */
+#define  UTS_TXEMPTY	 (1<<6)	 /* TxFIFO empty */
+#define  UTS_RXEMPTY	 (1<<5)	 /* RxFIFO empty */
+#define  UTS_TXFULL	 (1<<4)	 /* TxFIFO full */
+#define  UTS_RXFULL	 (1<<3)	 /* RxFIFO full */
+#define  UTS_SOFTRST	 (1<<0)	 /* Software reset */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void serial_setbrg (void)
+{
+	u32 clk = mx31_get_ipg_clk();
+
+	if (!gd->baudrate)
+		gd->baudrate = CONFIG_BAUDRATE;
+
+	__REG(UART_PHYS + UFCR) = 4 << 7; /* divide input clock by 2 */
+	__REG(UART_PHYS + UBIR) = 0xf;
+	__REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate);
+
+}
+
+int serial_getc (void)
+{
+	while (__REG(UART_PHYS + UTS) & UTS_RXEMPTY);
+	return (__REG(UART_PHYS + URXD) & URXD_RX_DATA); /* mask out status from upper word */
+}
+
+void serial_putc (const char c)
+{
+	__REG(UART_PHYS + UTXD) = c;
+
+	/* wait for transmitter to be ready */
+	while(!(__REG(UART_PHYS + UTS) & UTS_TXEMPTY));
+
+	/* If \n, also do \r */
+	if (c == '\n')
+		serial_putc ('\r');
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+int serial_tstc (void)
+{
+	/* If receive fifo is empty, return false */
+	if (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
+		return 0;
+	return 1;
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+/*
+ * 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)
+{
+	__REG(UART_PHYS + UCR1) = 0x0;
+	__REG(UART_PHYS + UCR2) = 0x0;
+
+	while (!(__REG(UART_PHYS + UCR2) & UCR2_SRST));
+
+	__REG(UART_PHYS + UCR3) = 0x0704;
+	__REG(UART_PHYS + UCR4) = 0x8000;
+	__REG(UART_PHYS + UESC) = 0x002b;
+	__REG(UART_PHYS + UTIM) = 0x0;
+
+	__REG(UART_PHYS + UTS) = 0x0;
+
+	serial_setbrg();
+
+	__REG(UART_PHYS + UCR2) = UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST;
+
+	__REG(UART_PHYS + UCR1) = UCR1_UARTEN;
+
+	return 0;
+}