| Kevin Hilman | 7c6337e | 2007-04-30 19:37:19 +0100 | [diff] [blame] | 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); |