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serial: clps711x: Update driver 

This patch updates the CLPS711X UART driver.
The update adds support for use with devicetree and
makes driver comatible with current driver from kernel.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Alexander Shiyan 2014-01-23 21:22:07 +04:00 committed by Sascha Hauer
parent 6c3e620e57
commit 32d6d2ae76
2 changed files with 86 additions and 42 deletions
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14
arch/arm/mach-clps711x/devices.c
View File

@ -51,26 +51,24 @@ void clps711x_setup_memcfg(int bank, u32 val)
}
static struct resource uart0_resources[] = {
DEFINE_RES_MEM(UBRLCR1, SZ_4),
DEFINE_RES_MEM(UARTDR1, SZ_4),
DEFINE_RES_MEM(UARTDR1, SZ_128),
};
static struct resource uart1_resources[] = {
DEFINE_RES_MEM(UBRLCR2, SZ_4),
DEFINE_RES_MEM(UARTDR2, SZ_4),
DEFINE_RES_MEM(UARTDR2, SZ_128),
};
void clps711x_add_uart(unsigned int id)
{
switch (id) {
case 0:
clk_add_alias(NULL, "clps711x_serial0", "uart", NULL);
add_generic_device_res("clps711x_serial", 0, uart0_resources,
clk_add_alias(NULL, "clps711x-uart0", "uart", NULL);
add_generic_device_res("clps711x-uart", 0, uart0_resources,
ARRAY_SIZE(uart0_resources), NULL);
break;
case 1:
clk_add_alias(NULL, "clps711x_serial1", "uart", NULL);
add_generic_device_res("clps711x_serial", 1, uart1_resources,
clk_add_alias(NULL, "clps711x-uart1", "uart", NULL);
add_generic_device_res("clps711x-uart", 1, uart1_resources,
ARRAY_SIZE(uart1_resources), NULL);
break;
}

114
drivers/serial/serial_clps711x.c
View File

@ -1,7 +1,7 @@
/*
* Simple CLPS711X serial driver
*
* (C) Copyright 2012 Alexander Shiyan <shc_work@mail.ru>
* (C) Copyright 2012-2014 Alexander Shiyan <shc_work@mail.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
@ -17,19 +17,37 @@
#include <linux/err.h>
#include <mfd/syscon.h>
#include <mach/clps711x.h>
#define UARTDR 0x00
# define UARTDR_FRMERR (1 << 8)
# define UARTDR_PARERR (1 << 9)
# define UARTDR_OVERR (1 << 10)
#define UBRLCR 0x40
# define UBRLCR_BAUD_MASK ((1 << 12) - 1)
# define UBRLCR_BREAK (1 << 12)
# define UBRLCR_PRTEN (1 << 13)
# define UBRLCR_EVENPRT (1 << 14)
# define UBRLCR_XSTOP (1 << 15)
# define UBRLCR_FIFOEN (1 << 16)
# define UBRLCR_WRDLEN5 (0 << 17)
# define UBRLCR_WRDLEN6 (1 << 17)
# define UBRLCR_WRDLEN7 (2 << 17)
# define UBRLCR_WRDLEN8 (3 << 17)
# define UBRLCR_WRDLEN_MASK (3 << 17)
#define SYSCON 0x00
# define SYSCON_UARTEN (1 << 8)
#define SYSFLG 0x40
# define SYSFLG_UBUSY (1 << 11)
# define SYSFLG_URXFE (1 << 22)
# define SYSFLG_UTXFF (1 << 23)
struct clps711x_uart {
void __iomem *UBRLCR;
void __iomem *UARTDR;
void __iomem *base;
void __iomem *syscon;
struct clk *uart_clk;
struct console_device cdev;
};
#define SYSCON(x) ((x)->syscon + 0x00)
#define SYSFLG(x) ((x)->syscon + 0x40)
static int clps711x_setbaudrate(struct console_device *cdev, int baudrate)
{
struct clps711x_uart *s = cdev->dev->priv;
@ -38,9 +56,9 @@ static int clps711x_setbaudrate(struct console_device *cdev, int baudrate)
divisor = (clk_get_rate(s->uart_clk) / 16) / baudrate;
tmp = readl(s->UBRLCR) & ~UBRLCR_BAUD_MASK;
tmp = readl(s->base + UBRLCR) & ~UBRLCR_BAUD_MASK;
tmp |= divisor - 1;
writel(tmp, s->UBRLCR);
writel(tmp, s->base + UBRLCR);
return 0;
}
@ -51,15 +69,17 @@ static void clps711x_init_port(struct console_device *cdev)
u32 tmp;
/* Disable the UART */
writel(readl(SYSCON(s)) & ~SYSCON_UARTEN, SYSCON(s));
tmp = readl(s->syscon + SYSCON);
writel(tmp & ~SYSCON_UARTEN, s->syscon + SYSCON);
/* Setup Line Control Register */
tmp = readl(s->UBRLCR) & UBRLCR_BAUD_MASK;
tmp = readl(s->base + UBRLCR) & UBRLCR_BAUD_MASK;
tmp |= UBRLCR_FIFOEN | UBRLCR_WRDLEN8; /* FIFO on, 8N1 mode */
writel(tmp, s->UBRLCR);
writel(tmp, s->base + UBRLCR);
/* Enable the UART */
writel(readl(SYSCON(s)) | SYSCON_UARTEN, SYSCON(s));
tmp = readl(s->syscon + SYSCON);
writel(tmp | SYSCON_UARTEN, s->syscon + SYSCON);
}
static void clps711x_putc(struct console_device *cdev, char c)
@ -67,11 +87,11 @@ static void clps711x_putc(struct console_device *cdev, char c)
struct clps711x_uart *s = cdev->dev->priv;
/* Wait until there is space in the FIFO */
while (readl(SYSFLG(s)) & SYSFLG_UTXFF)
barrier();
do {
} while (readl(s->syscon + SYSFLG) & SYSFLG_UTXFF);
/* Send the character */
writew(c, s->UARTDR);
writew(c, s->base + UARTDR);
}
static int clps711x_getc(struct console_device *cdev)
@ -80,10 +100,10 @@ static int clps711x_getc(struct console_device *cdev)
u16 data;
/* Wait until there is data in the FIFO */
while (readl(SYSFLG(s)) & SYSFLG_URXFE)
barrier();
do {
} while (readl(s->syscon + SYSFLG) & SYSFLG_URXFE);
data = readw(s->UARTDR);
data = readw(s->base + UARTDR);
/* Check for an error flag */
if (data & (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR))
@ -96,35 +116,50 @@ static int clps711x_tstc(struct console_device *cdev)
{
struct clps711x_uart *s = cdev->dev->priv;
return !(readl(SYSFLG(s)) & SYSFLG_URXFE);
return !(readl(s->syscon + SYSFLG) & SYSFLG_URXFE);
}
static void clps711x_flush(struct console_device *cdev)
{
struct clps711x_uart *s = cdev->dev->priv;
while (readl(SYSFLG(s)) & SYSFLG_UBUSY)
barrier();
do {
} while (readl(s->syscon + SYSFLG) & SYSFLG_UBUSY);
}
static int clps711x_probe(struct device_d *dev)
{
struct clps711x_uart *s;
int err, id = dev->id;
char syscon_dev[8];
BUG_ON(dev->num_resources != 2);
BUG_ON((dev->id != 0) && (dev->id != 1));
if (dev->device_node)
id = of_alias_get_id(dev->device_node, "serial");
if (id != 0 && id != 1)
return -EINVAL;
s = xzalloc(sizeof(struct clps711x_uart));
s->uart_clk = clk_get(dev, NULL);
BUG_ON(IS_ERR(s->uart_clk));
if (IS_ERR(s->uart_clk)) {
err = PTR_ERR(s->uart_clk);
goto out_err;
}
s->UBRLCR = dev_get_mem_region(dev, 0);
s->UARTDR = dev_get_mem_region(dev, 1);
s->base = dev_get_mem_region(dev, 0);
sprintf(syscon_dev, "syscon%i", dev->id + 1);
s->syscon = syscon_base_lookup_by_pdevname(syscon_dev);
BUG_ON(IS_ERR(s->syscon));
if (!dev->device_node) {
sprintf(syscon_dev, "syscon%i", id + 1);
s->syscon = syscon_base_lookup_by_pdevname(syscon_dev);
} else {
s->syscon = syscon_base_lookup_by_phandle(dev->device_node,
"syscon");
}
if (IS_ERR(s->syscon)) {
err = PTR_ERR(s->syscon);
goto out_err;
}
dev->priv = s;
s->cdev.dev = dev;
@ -135,7 +170,13 @@ static int clps711x_probe(struct device_d *dev)
s->cdev.setbrg = clps711x_setbaudrate;
clps711x_init_port(&s->cdev);
return console_register(&s->cdev);
err = console_register(&s->cdev);
out_err:
if (err)
free(s);
return err;
}
static void clps711x_remove(struct device_d *dev)
@ -147,9 +188,14 @@ static void clps711x_remove(struct device_d *dev)
free(s);
}
static struct of_device_id __maybe_unused clps711x_uart_dt_ids[] = {
{ .compatible = "cirrus,clps711x-uart", },
};
static struct driver_d clps711x_driver = {
.name = "clps711x_serial",
.probe = clps711x_probe,
.remove = clps711x_remove,
.name = "clps711x-uart",
.probe = clps711x_probe,
.remove = clps711x_remove,
.of_compatible = DRV_OF_COMPAT(clps711x_uart_dt_ids),
};
console_platform_driver(clps711x_driver);