/* * 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 <asm/io.h> #include <asm/irq.h> #include <asm/hardware.h> #include <asm/arch/serial.h> #include <asm/arch/irqs.h> #define UART_DAVINCI_PWREMU 0x0c static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up, int offset) { offset <<= up->regshift; return (unsigned int)__raw_readb(up->membase + offset); } static inline void davinci_serial_outp(struct plat_serial8250_port *p, int offset, int value) { offset <<= p->regshift; __raw_writeb(value, p->membase + offset); } static struct plat_serial8250_port serial_platform_data[] = { { .membase = (char *)IO_ADDRESS(DAVINCI_UART0_BASE), .mapbase = (unsigned long)DAVINCI_UART0_BASE, .irq = IRQ_UARTINT0, .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, .iotype = UPIO_MEM, .regshift = 2, .uartclk = 27000000, }, { .flags = 0 }, }; static struct platform_device serial_device = { .name = "serial8250", .id = PLAT8250_DEV_PLATFORM, .dev = { .platform_data = serial_platform_data, }, }; static void __init davinci_serial_reset(struct plat_serial8250_port *p) { /* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */ unsigned int pwremu = 0; davinci_serial_outp(p, UART_IER, 0); /* disable all interrupts */ davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu); mdelay(10); pwremu |= (0x3 << 13); pwremu |= 0x1; davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu); } static int __init davinci_init(void) { davinci_serial_reset(&serial_platform_data[0]); return platform_device_register(&serial_device); } arch_initcall(davinci_init);