Pull video into release branch
[linux-2.6] / arch / arm / mach-davinci / serial.c
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
38 static 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
45 static 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
52 static 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
67 static struct platform_device serial_device = {
68         .name                   = "serial8250",
69         .id                     = PLAT8250_DEV_PLATFORM,
70         .dev                    = {
71                 .platform_data  = serial_platform_data,
72         },
73 };
74
75 static 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
90 static int __init davinci_init(void)
91 {
92         davinci_serial_reset(&serial_platform_data[0]);
93         return platform_device_register(&serial_device);
94 }
95
96 arch_initcall(davinci_init);