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Davinci: serial - use ioremap() 

This patch implements davinci serial cleanups towards having this code
reusable on tnetv107x.

The change reuses the platform data membase field to hold the remapped space.
By disabling the UPF_IOREMAP flag in the platform data, we prevent
the 8250 driver from repeating the ioremap.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
hifive-unleashed-5.1
Cyril Chemparathy 2010-05-02 14:28:13 -04:00 committed by Kevin Hilman
parent da0122ca8b
commit 9ee1acefa8
1 changed files with 25 additions and 7 deletions
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32
arch/arm/mach-davinci/serial.c
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@ -35,14 +35,20 @@ static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
int offset)
{
offset <<= up->regshift;
return (unsigned int)__raw_readl(IO_ADDRESS(up->mapbase) + offset);
WARN_ONCE(!up->membase, "unmapped read: uart[%d]\n", offset);
return (unsigned int)__raw_readl(up->membase + offset);
}
static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
int value)
{
offset <<= p->regshift;
__raw_writel(value, IO_ADDRESS(p->mapbase) + offset);
WARN_ONCE(!p->membase, "unmapped write: uart[%d]\n", offset);
__raw_writel(value, p->membase + offset);
}
static void __init davinci_serial_reset(struct plat_serial8250_port *p)
@ -83,14 +89,26 @@ int __init davinci_serial_init(struct davinci_uart_config *info)
sprintf(name, "uart%d", i);
uart_clk = clk_get(dev, name);
if (IS_ERR(uart_clk))
if (IS_ERR(uart_clk)) {
printk(KERN_ERR "%s:%d: failed to get UART%d clock\n",
__func__, __LINE__, i);
else {
clk_enable(uart_clk);
p->uartclk = clk_get_rate(uart_clk);
davinci_serial_reset(p);
continue;
}
clk_enable(uart_clk);
p->uartclk = clk_get_rate(uart_clk);
if (!p->membase && p->mapbase) {
p->membase = ioremap(p->mapbase, SZ_4K);
if (p->membase)
p->flags &= ~UPF_IOREMAP;
else
pr_err("uart regs ioremap failed\n");
}
if (p->membase)
davinci_serial_reset(p);
}
return platform_device_register(soc_info->serial_dev);