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7c6337e2 KH |
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> | |
be509729 | 32 | #include <asm/arch/hardware.h> |
7c6337e2 KH |
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); |