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Add PrimeCell PL010 serial driver 

Added driver for ARM PrimeCell PL010 UART

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Matthias Kaehlcke 2010-01-12 20:30:51 +01:00 committed by Sascha Hauer
parent 80bbe0c66e
commit f13033d938
4 changed files with 280 additions and 1 deletions
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7
drivers/serial/Kconfig
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@ -47,6 +47,13 @@ config DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
help
Say Y here if you are using OMAP extensions to NS16550
config DRIVER_SERIAL_PL010
depends on ARCH_EP93XX
default y
bool "ARM AMBA PL010 support"
help
Enable this to get support for AMBA PL010 based serial devices
config DRIVER_SERIAL_S3C24X0
bool "Samsung S3C24X0 serial driver"
depends on ARCH_S3C24xx

2
drivers/serial/Makefile
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@ -3,7 +3,6 @@
# s3c4510b_uart.o
# serial_max3100.o
# serial_pl010.o
# serial_pl011.o
# serial_xuartlite.o
obj-$(CONFIG_DRIVER_SERIAL_ARM_DCC) += arm_dcc.o
obj-$(CONFIG_DRIVER_SERIAL_IMX) += serial_imx.o
@ -13,4 +12,5 @@ obj-$(CONFIG_DRIVER_SERIAL_LINUX_COMSOLE) += linux_console.o
obj-$(CONFIG_DRIVER_SERIAL_MPC5XXX) += serial_mpc5xxx.o
obj-$(CONFIG_DRIVER_SERIAL_BLACKFIN) += serial_blackfin.o
obj-$(CONFIG_DRIVER_SERIAL_NS16550) += serial_ns16550.o
obj-$(CONFIG_DRIVER_SERIAL_PL010) += serial_pl010.o
obj-$(CONFIG_DRIVER_SERIAL_S3C24X0) += serial_s3c24x0.o

172
drivers/serial/serial_pl010.c Normal file
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@ -0,0 +1,172 @@
/*
* Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
*
* (C) Copyright 2000
* Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
*
* (C) Copyright 2004
* ARM Ltd.
* Philippe Robin, <philippe.robin@arm.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
/* Simple U-Boot driver for the PrimeCell PL010/PL011 UARTs */
#include <common.h>
#include <init.h>
#include <malloc.h>
#include <asm/io.h>
#include "serial_pl010.h"
static int pl010_setbaudrate(struct console_device *cdev, int baudrate)
{
struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
unsigned int divisor;
switch (baudrate) {
case 9600:
divisor = UART_PL010_BAUD_9600;
break;
case 19200:
divisor = UART_PL010_BAUD_9600;
break;
case 38400:
divisor = UART_PL010_BAUD_38400;
break;
case 57600:
divisor = UART_PL010_BAUD_57600;
break;
case 115200:
divisor = UART_PL010_BAUD_115200;
break;
default:
divisor = UART_PL010_BAUD_38400;
}
writel((divisor & 0xf00) >> 8, &pl010->linctrlmid);
writel(divisor & 0xff, &pl010->linctrllow);
/* high register must always be written */
writel(readl(&pl010->linctrlhigh), &pl010->linctrlhigh);
return 0;
}
static int pl010_init_port(struct console_device *cdev)
{
struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
/*
* First, disable everything.
*/
writel(0x00, &pl010->ctrl);
/*
* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
*/
writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN,
&pl010->linctrlhigh);
/*
* Finally, enable the UART
*/
writel(UART_PL010_CR_UARTEN, &pl010->ctrl);
return 0;
}
static void pl010_putc(struct console_device *cdev, char c)
{
struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
/* Wait until there is space in the FIFO */
while (readl(&pl010->flag) & UART_PL010_FR_TXFF)
; /* noop */
/* Send the character */
writel(c, &pl010->data);
}
static int pl010_getc(struct console_device *cdev)
{
struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
unsigned int data;
/* Wait until there is data in the FIFO */
while (readl(&pl010->flag) & UART_PL010_FR_RXFE)
; /* noop */
data = readl(&pl010->data);
/* Check for an error flag */
if (data & 0xFFFFFF00) {
/* Clear the error */
writel(0xFFFFFFFF, &pl010->errclr);
return -1;
}
return (int)data;
}
static int pl010_tstc(struct console_device *cdev)
{
struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base;
return !(readl(&pl010->flag) & UART_PL010_FR_RXFE);
}
static int pl010_probe(struct device_d *dev)
{
struct console_device *cdev;
cdev = malloc(sizeof(struct console_device));
dev->type_data = cdev;
cdev->dev = dev;
cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
cdev->tstc = pl010_tstc;
cdev->putc = pl010_putc;
cdev->getc = pl010_getc;
cdev->setbrg = pl010_setbaudrate;
pl010_init_port(cdev);
console_register(cdev);
return 0;
}
static struct driver_d pl010_driver = {
.name = "pl010_serial",
.probe = pl010_probe,
};
static int pl010_init(void)
{
register_driver(&pl010_driver);
return 0;
}
console_initcall(pl010_init);

100
drivers/serial/serial_pl010.h Normal file
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@ -0,0 +1,100 @@
/*
* Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
*
* (C) Copyright 2003, 2004
* ARM Ltd.
* Philippe Robin, <philippe.robin@arm.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
struct hldc_struct {
uint32_t ctrl;
uint32_t addmtchval;
uint32_t addmask;
uint32_t rxinfobuf;
uint32_t sts;
};
struct pl010_struct {
uint32_t data;
union {
uint32_t rxsts;
uint32_t errclr;
};
uint32_t linctrlhigh;
uint32_t linctrlmid;
uint32_t linctrllow;
uint32_t ctrl;
uint32_t flag;
union {
uint32_t intid;
uint32_t intclr;
};
uint32_t not_used0[2];
uint32_t dmactrl;
uint32_t not_used1[53];
uint32_t modemctrl;
uint32_t modemsts;
uint32_t not_used2[65];
struct hldc_struct hldc;
};
#define UART_PL010_RSR_OE (1 << 3)
#define UART_PL010_RSR_BE (1 << 2)
#define UART_PL010_RSR_PE (1 << 1)
#define UART_PL010_RSR_FE (1 << 0)
#define UART_PL010_FR_TXFE (1 << 7)
#define UART_PL010_FR_RXFF (1 << 6)
#define UART_PL010_FR_TXFF (1 << 5)
#define UART_PL010_FR_RXFE (1 << 4)
#define UART_PL010_FR_BUSY (1 << 3)
#define UART_PL010_FR_TMSK (UART_PL010_FR_TXFF + UART_PL010_FR_BUSY)
#define UART_PL010_CR_LPE (1 << 7)
#define UART_PL010_CR_RTIE (1 << 6)
#define UART_PL010_CR_TIE (1 << 5)
#define UART_PL010_CR_RIE (1 << 4)
#define UART_PL010_CR_MSIE (1 << 3)
#define UART_PL010_CR_IIRLP (1 << 2)
#define UART_PL010_CR_SIREN (1 << 1)
#define UART_PL010_CR_UARTEN (1 << 0)
#define UART_PL010_LCRH_WLEN_8 (3 << 5)
#define UART_PL010_LCRH_WLEN_7 (2 << 5)
#define UART_PL010_LCRH_WLEN_6 (1 << 5)
#define UART_PL010_LCRH_WLEN_5 (0 << 5)
#define UART_PL010_LCRH_FEN (1 << 4)
#define UART_PL010_LCRH_STP2 (1 << 3)
#define UART_PL010_LCRH_EPS (1 << 2)
#define UART_PL010_LCRH_PEN (1 << 1)
#define UART_PL010_LCRH_BRK (1 << 0)
#define UART_PL010_BAUD_460800 1
#define UART_PL010_BAUD_230400 3
#define UART_PL010_BAUD_115200 7
#define UART_PL010_BAUD_57600 15
#define UART_PL010_BAUD_38400 23
#define UART_PL010_BAUD_19200 47
#define UART_PL010_BAUD_14400 63
#define UART_PL010_BAUD_9600 95
#define UART_PL010_BAUD_4800 191
#define UART_PL010_BAUD_2400 383
#define UART_PL010_BAUD_1200 767