158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/*
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* TI DaVinci serial driver
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*
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* Copyright (C) 2006 Texas Instruments.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_reg.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <mach/hardware.h>
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#include <mach/serial.h>
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#include <mach/irqs.h>
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#include <mach/cputype.h>
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#include "clock.h"
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static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
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int offset)
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{
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offset <<= up->regshift;
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return (unsigned int)__raw_readl(IO_ADDRESS(up->mapbase) + offset);
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}
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static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
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int value)
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{
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offset <<= p->regshift;
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__raw_writel(value, IO_ADDRESS(p->mapbase) + offset);
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}
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static struct plat_serial8250_port serial_platform_data[] = {
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{
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.mapbase = DAVINCI_UART0_BASE,
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.irq = IRQ_UARTINT0,
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.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
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UPF_IOREMAP,
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.iotype = UPIO_MEM,
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.regshift = 2,
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},
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{
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.mapbase = DAVINCI_UART1_BASE,
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.irq = IRQ_UARTINT1,
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.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
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UPF_IOREMAP,
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.iotype = UPIO_MEM,
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.regshift = 2,
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},
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{
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.mapbase = DAVINCI_UART2_BASE,
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.irq = IRQ_UARTINT2,
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.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
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UPF_IOREMAP,
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.iotype = UPIO_MEM,
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.regshift = 2,
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},
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{
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.flags = 0
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},
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};
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static struct platform_device serial_device = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev = {
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.platform_data = serial_platform_data,
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},
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};
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static void __init davinci_serial_reset(struct plat_serial8250_port *p)
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{
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unsigned int pwremu = 0;
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serial_write_reg(p, UART_IER, 0); /* disable all interrupts */
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/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
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mdelay(10);
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pwremu |= (0x3 << 13);
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pwremu |= 0x1;
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
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if (cpu_is_davinci_dm646x())
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serial_write_reg(p, UART_DM646X_SCR,
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UART_DM646X_SCR_TX_WATERMARK);
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}
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void __init davinci_serial_init(struct davinci_uart_config *info)
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{
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int i;
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char name[16];
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struct clk *uart_clk;
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struct device *dev = &serial_device.dev;
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/*
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* Make sure the serial ports are muxed on at this point.
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* You have to mux them off in device drivers later on
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* if not needed.
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*/
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for (i = 0; i < DAVINCI_MAX_NR_UARTS; i++) {
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struct plat_serial8250_port *p = serial_platform_data + i;
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if (!(info->enabled_uarts & (1 << i))) {
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p->flags = 0;
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continue;
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}
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if (cpu_is_davinci_dm646x())
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p->iotype = UPIO_MEM32;
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if (cpu_is_davinci_dm355()) {
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if (i == 2) {
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p->mapbase = (unsigned long)DM355_UART2_BASE;
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p->irq = IRQ_DM355_UARTINT2;
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}
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}
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sprintf(name, "uart%d", i);
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uart_clk = clk_get(dev, name);
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if (IS_ERR(uart_clk))
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printk(KERN_ERR "%s:%d: failed to get UART%d clock\n",
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__func__, __LINE__, i);
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else {
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clk_enable(uart_clk);
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p->uartclk = clk_get_rate(uart_clk);
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davinci_serial_reset(p);
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}
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}
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}
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static int __init davinci_init(void)
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{
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return platform_device_register(&serial_device);
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}
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arch_initcall(davinci_init);
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