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pl01x: use C structs and readl/writel

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

Acked-by: Michael Brandt <michael.brandt@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
master
Rabin Vincent 14 years ago committed by Wolfgang Denk
parent b0bc8b70ff
commit 72d5e44c95
2 changed files with 52 additions and 39 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 50
      drivers/serial/serial_pl01x.c
  2. 41
      drivers/serial/serial_pl01x.h

50
drivers/serial/serial_pl01x.c
Unescape View File

@ -47,14 +47,20 @@ static int pl01x_tstc (int portnum);
unsigned int baudrate = CONFIG_BAUDRATE;
DECLARE_GLOBAL_DATA_PTR;
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 */
writel(0x0, port[CONSOLE_PORT] + UART_PL010_CR);
writel(0, &regs->pl010_cr);
/* Set baud rate */
switch (baudrate) {
@ -82,15 +88,14 @@ int serial_init (void)
divisor = UART_PL010_BAUD_38400;
}
writel(((divisor & 0xf00) >> 8), port[CONSOLE_PORT] + UART_PL010_LCRM);
writel((divisor & 0xff), port[CONSOLE_PORT] + UART_PL010_LCRL);
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 */
writel((UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN),
port[CONSOLE_PORT] + UART_PL010_LCRH);
writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN, &regs->pl010_lcrh);
/* Finally, enable the UART */
writel((UART_PL010_CR_UARTEN), port[CONSOLE_PORT] + UART_PL010_CR);
writel(UART_PL010_CR_UARTEN, &regs->pl010_cr);
return 0;
}
@ -101,13 +106,14 @@ 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;
unsigned int fraction;
/* First, disable everything */
writel(0x0, port[CONSOLE_PORT] + UART_PL011_CR);
writel(0, &regs->pl011_cr);
/*
* Set baud rate
@ -121,16 +127,16 @@ int serial_init (void)
temp = (8 * remainder) / baudrate;
fraction = (temp >> 1) + (temp & 1);
writel(divider, port[CONSOLE_PORT] + UART_PL011_IBRD);
writel(fraction, port[CONSOLE_PORT] + UART_PL011_FBRD);
writel(divider, &regs->pl011_ibrd);
writel(fraction, &regs->pl011_fbrd);
/* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled */
writel((UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN),
port[CONSOLE_PORT] + UART_PL011_LCRH);
writel(UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN,
&regs->pl011_lcrh);
/* Finally, enable the UART */
writel((UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE),
port[CONSOLE_PORT] + UART_PL011_CR);
writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE,
&regs->pl011_cr);
return 0;
}
@ -170,28 +176,31 @@ 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 (readl(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
while (readl(&regs->fr) & UART_PL01x_FR_TXFF)
WATCHDOG_RESET();
/* Send the character */
writel(c, port[portnum] + UART_PL01x_DR);
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 (readl(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
while (readl(&regs->fr) & UART_PL01x_FR_RXFE)
WATCHDOG_RESET();
data = readl(port[portnum] + UART_PL01x_DR);
data = readl(&regs->dr);
/* Check for an error flag */
if (data & 0xFFFFFF00) {
/* Clear the error */
writel(0xFFFFFFFF, port[portnum] + UART_PL01x_ECR);
writel(0xFFFFFFFF, &regs->ecr);
return -1;
}
@ -200,7 +209,8 @@ static int pl01x_getc (int portnum)
static int pl01x_tstc (int portnum)
{
struct pl01x_regs *regs = pl01x_get_regs(portnum);
WATCHDOG_RESET();
return !(readl(port[portnum] + UART_PL01x_FR) &
UART_PL01x_FR_RXFE);
return !(readl(&regs->fr) & UART_PL01x_FR_RXFE);
}

41
drivers/serial/serial_pl01x.h
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@ -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)

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