[U-Boot] [PATCH] pl01x: use C structs and readl/writel

Rabin Vincent rabin.vincent at stericsson.com
Wed May 5 05:53:07 CEST 2010 

Use C structs for registers, and use readl/writel instead of custom
accessors.

Acked-by: Michael Brandt <michael.brandt at stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent at stericsson.com>
---
 drivers/serial/serial_pl01x.c |   56 ++++++++++++++++++++++------------------
 drivers/serial/serial_pl01x.h |   41 ++++++++++++++++--------------
 2 files changed, 53 insertions(+), 44 deletions(-)

diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index c645cef..d2609d6 100644
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -29,12 +29,10 @@
 
 #include <common.h>
 #include <watchdog.h>
+#include <asm/io.h>
 
 #include "serial_pl01x.h"
 
-#define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
-#define IO_READ(addr) (*(volatile unsigned int *)(addr))
-
 /*
  * Integrator AP has two UARTs, we use the first one, at 38400-8-N-1
  * Integrator CP has two UARTs, use the first one, at 38400-8-N-1
@@ -49,16 +47,22 @@ static void pl01x_putc (int portnum, char c);
 static int pl01x_getc (int portnum);
 static int pl01x_tstc (int portnum);
 
+static struct pl01x_regs *pl01x_get_regs(int portnum)
+{
+	return (struct pl01x_regs *) port[portnum];
+}
+
 #ifdef CONFIG_PL010_SERIAL
 
 int serial_init (void)
 {
+	struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
 	unsigned int divisor;
 
 	/*
 	 ** First, disable everything.
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
+	writel(0, &regs->pl010_cr);
 
 	/*
 	 ** Set baud rate
@@ -89,20 +93,18 @@ int serial_init (void)
 		divisor = UART_PL010_BAUD_38400;
 	}
 
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRM,
-		  ((divisor & 0xf00) >> 8));
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
+	writel((divisor & 0xf00) >> 8, &regs->pl010_lcrm);
+	writel(divisor & 0xff, &regs->pl010_lcrl);
 
 	/*
 	 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRH,
-		  (UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
+	writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN, &regs->pl010_lcrh);
 
 	/*
 	 ** Finally, enable the UART
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
+	writel(UART_PL010_CR_UARTEN, &regs->pl010_cr);
 
 	return 0;
 }
@@ -113,6 +115,7 @@ int serial_init (void)
 
 int serial_init (void)
 {
+	struct pl01x_regs *regs = pl01x_get_regs(CONSOLE_PORT);
 	unsigned int temp;
 	unsigned int divider;
 	unsigned int remainder;
@@ -121,7 +124,7 @@ int serial_init (void)
 	/*
 	 ** First, disable everything.
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
+	writel(0, &regs->pl011_cr);
 
 	/*
 	 ** Set baud rate
@@ -135,21 +138,20 @@ int serial_init (void)
 	temp = (8 * remainder) / baudRate;
 	fraction = (temp >> 1) + (temp & 1);
 
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_IBRD, divider);
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_FBRD, fraction);
+	writel(divider, &regs->pl011_ibrd);
+	writel(fraction, &regs->pl011_fbrd);
 
 	/*
 	 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_LCRH,
-		  (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN));
+	writel(UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN,
+	       &regs->pl011_lcrh);
 
 	/*
 	 ** Finally, enable the UART
 	 */
-	IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR,
-		  (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
-		   UART_PL011_CR_RXE));
+	writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE,
+	       &regs->pl011_cr);
 
 	return 0;
 }
@@ -187,28 +189,31 @@ void serial_setbrg (void)
 
 static void pl01x_putc (int portnum, char c)
 {
+	struct pl01x_regs *regs = pl01x_get_regs(portnum);
+
 	/* Wait until there is space in the FIFO */
-	while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
+	while (readl(&regs->fr) & UART_PL01x_FR_TXFF)
 		WATCHDOG_RESET();
 
 	/* Send the character */
-	IO_WRITE (port[portnum] + UART_PL01x_DR, c);
+	writel(c, &regs->dr);
 }
 
 static int pl01x_getc (int portnum)
 {
+	struct pl01x_regs *regs = pl01x_get_regs(portnum);
 	unsigned int data;
 
 	/* Wait until there is data in the FIFO */
-	while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
+	while (readl(&regs->fr) & UART_PL01x_FR_RXFE)
 		WATCHDOG_RESET();
 
-	data = IO_READ (port[portnum] + UART_PL01x_DR);
+	data = readl(&regs->dr);
 
 	/* Check for an error flag */
 	if (data & 0xFFFFFF00) {
 		/* Clear the error */
-		IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
+		writel(0xFFFFFFFF, &regs->ecr);
 		return -1;
 	}
 
@@ -217,7 +222,8 @@ static int pl01x_getc (int portnum)
 
 static int pl01x_tstc (int portnum)
 {
+	struct pl01x_regs *regs = pl01x_get_regs(portnum);
+
 	WATCHDOG_RESET();
-	return !(IO_READ (port[portnum] + UART_PL01x_FR) &
-		 UART_PL01x_FR_RXFE);
+	return !(readl(&regs->fr) & UART_PL01x_FR_RXFE);
 }
diff --git a/drivers/serial/serial_pl01x.h b/drivers/serial/serial_pl01x.h
index 5f20fdd..b670c24 100644
--- a/drivers/serial/serial_pl01x.h
+++ b/drivers/serial/serial_pl01x.h
@@ -29,10 +29,28 @@
  *  Definitions common to both PL010 & PL011
  *
  */
-#define UART_PL01x_DR                   0x00	 /*  Data read or written from the interface. */
-#define UART_PL01x_RSR                  0x04	 /*  Receive status register (Read). */
-#define UART_PL01x_ECR                  0x04	 /*  Error clear register (Write). */
-#define UART_PL01x_FR                   0x18	 /*  Flag register (Read only). */
+
+#ifndef __ASSEMBLY__
+/*
+ * We can use a combined structure for PL010 and PL011, because they overlap
+ * only in common registers.
+ */
+struct pl01x_regs {
+	u32	dr;		/* 0x00 Data register */
+	u32	ecr;		/* 0x04 Error clear register (Write) */
+	u32	pl010_lcrh;	/* 0x08 Line control register, high byte */
+	u32	pl010_lcrm;	/* 0x0C Line control register, middle byte */
+	u32	pl010_lcrl;	/* 0x10 Line control register, low byte */
+	u32	pl010_cr;	/* 0x14 Control register */
+	u32	fr;		/* 0x18 Flag register (Read only) */
+	u32	reserved;
+	u32	ilpr;		/* 0x20 IrDA low-power counter register */
+	u32	pl011_ibrd;	/* 0x24 Integer baud rate register */
+	u32	pl011_fbrd;	/* 0x28 Fractional baud rate register */
+	u32	pl011_lcrh;	/* 0x2C Line control register */
+	u32	pl011_cr;	/* 0x30 Control register */
+};
+#endif
 
 #define UART_PL01x_RSR_OE               0x08
 #define UART_PL01x_RSR_BE               0x04
@@ -50,14 +68,6 @@
  *  PL010 definitions
  *
  */
-#define UART_PL010_LCRH                 0x08	 /*  Line control register, high byte. */
-#define UART_PL010_LCRM                 0x0C	 /*  Line control register, middle byte. */
-#define UART_PL010_LCRL                 0x10	 /*  Line control register, low byte. */
-#define UART_PL010_CR                   0x14	 /*  Control register. */
-#define UART_PL010_IIR                  0x1C	 /*  Interrupt indentification register (Read). */
-#define UART_PL010_ICR                  0x1C	 /*  Interrupt clear register (Write). */
-#define UART_PL010_ILPR                 0x20	 /*  IrDA low power counter register. */
-
 #define UART_PL010_CR_LPE               (1 << 7)
 #define UART_PL010_CR_RTIE              (1 << 6)
 #define UART_PL010_CR_TIE               (1 << 5)
@@ -93,13 +103,6 @@
  *  PL011 definitions
  *
  */
-#define UART_PL011_IBRD                 0x24
-#define UART_PL011_FBRD                 0x28
-#define UART_PL011_LCRH                 0x2C
-#define UART_PL011_CR                   0x30
-#define UART_PL011_IMSC                 0x38
-#define UART_PL011_PERIPH_ID0           0xFE0
-
 #define UART_PL011_LCRH_SPS             (1 << 7)
 #define UART_PL011_LCRH_WLEN_8          (3 << 5)
 #define UART_PL011_LCRH_WLEN_7          (2 << 5)
-- 
1.7.0

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