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/*
* TI DaVinci serial driver
*
* Copyright (C) 2006 Texas Instruments.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/serial.h>
#include <mach/cputype.h>
static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
int offset)
{
offset <<= up->regshift;
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;
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)
{
unsigned int pwremu = 0;
serial_write_reg(p, UART_IER, 0); /* disable all interrupts */
/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
mdelay(10);
pwremu |= (0x3 << 13);
pwremu |= 0x1;
serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
if (cpu_is_davinci_dm646x())
serial_write_reg(p, UART_DM646X_SCR,
UART_DM646X_SCR_TX_WATERMARK);
}
/* Enable UART clock and obtain its rate */
int __init davinci_serial_setup_clk(unsigned instance, unsigned int *rate)
{
char name[16];
struct clk *clk;
struct davinci_soc_info *soc_info = &davinci_soc_info;
struct device *dev = &soc_info->serial_dev->dev;
sprintf(name, "uart%d", instance);
clk = clk_get(dev, name);
if (IS_ERR(clk)) {
pr_err("%s:%d: failed to get UART%d clock\n",
__func__, __LINE__, instance);
return PTR_ERR(clk);
}
clk_prepare_enable(clk);
if (rate)
*rate = clk_get_rate(clk);
return 0;
}
int __init davinci_serial_init(struct davinci_uart_config *info)
{
int i, ret;
struct davinci_soc_info *soc_info = &davinci_soc_info;
struct device *dev = &soc_info->serial_dev->dev;
struct plat_serial8250_port *p = dev->platform_data;
/*
* Make sure the serial ports are muxed on at this point.
* You have to mux them off in device drivers later on if not needed.
*/
for (i = 0; p->flags; i++, p++) {
if (!(info->enabled_uarts & (1 << i)))
continue;
ret = davinci_serial_setup_clk(i, &p->uartclk);
if (ret)
continue;
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 && p->type != PORT_AR7)
davinci_serial_reset(p);
}
return platform_device_register(soc_info->serial_dev);
}
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