1/*
2 * TI DaVinci serial driver
3 *
4 * Copyright (C) 2006 Texas Instruments.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
14 * GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with this program; if not, write to the Free Software
18 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 */
21
22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/serial_8250.h>
25#include <linux/serial_reg.h>
26#include <linux/platform_device.h>
27#include <linux/delay.h>
28#include <linux/clk.h>
29
30#include <asm/io.h>
31#include <asm/irq.h>
32#include <asm/hardware.h>
33#include <asm/arch/serial.h>
34#include <asm/arch/irqs.h>
35
36#define UART_DAVINCI_PWREMU 0x0c
37
38static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up,
39					  int offset)
40{
41	offset <<= up->regshift;
42	return (unsigned int)__raw_readb(up->membase + offset);
43}
44
45static inline void davinci_serial_outp(struct plat_serial8250_port *p,
46				       int offset, int value)
47{
48	offset <<= p->regshift;
49	__raw_writeb(value, p->membase + offset);
50}
51
52static struct plat_serial8250_port serial_platform_data[] = {
53	{
54		.membase	= (char *)IO_ADDRESS(DAVINCI_UART0_BASE),
55		.mapbase	= (unsigned long)DAVINCI_UART0_BASE,
56		.irq		= IRQ_UARTINT0,
57		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
58		.iotype		= UPIO_MEM,
59		.regshift	= 2,
60		.uartclk	= 27000000,
61	},
62	{
63		.flags		= 0
64	},
65};
66
67static struct platform_device serial_device = {
68	.name			= "serial8250",
69	.id			= PLAT8250_DEV_PLATFORM,
70	.dev			= {
71		.platform_data	= serial_platform_data,
72	},
73};
74
75static void __init davinci_serial_reset(struct plat_serial8250_port *p)
76{
77	/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
78	unsigned int pwremu = 0;
79
80	davinci_serial_outp(p, UART_IER, 0);  /* disable all interrupts */
81
82	davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
83	mdelay(10);
84
85	pwremu |= (0x3 << 13);
86	pwremu |= 0x1;
87	davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
88}
89
90static int __init davinci_init(void)
91{
92	davinci_serial_reset(&serial_platform_data[0]);
93	return platform_device_register(&serial_device);
94}
95
96arch_initcall(davinci_init);
97