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serial.c

/*
 * arch/arm/mach-omap2/serial.c
 *
 * OMAP2 serial support.
 *
 * Copyright (C) 2005 Nokia Corporation
 * Author: Paul Mundt <paul.mundt@nokia.com>
 *
 * Based off of arch/arm/mach-omap/omap1/serial.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>

#include <asm/io.h>

#include <asm/arch/common.h>
#include <asm/arch/board.h>

static struct clk * uart1_ick = NULL;
static struct clk * uart1_fck = NULL;
static struct clk * uart2_ick = NULL;
static struct clk * uart2_fck = NULL;
static struct clk * uart3_ick = NULL;
static struct clk * uart3_fck = NULL;

static struct plat_serial8250_port serial_platform_data[] = {
      {
            .membase    = (char *)IO_ADDRESS(OMAP_UART1_BASE),
            .mapbase    = (unsigned long)OMAP_UART1_BASE,
            .irq        = 72,
            .flags            = UPF_BOOT_AUTOCONF,
            .iotype           = UPIO_MEM,
            .regshift   = 2,
            .uartclk    = OMAP16XX_BASE_BAUD * 16,
      }, {
            .membase    = (char *)IO_ADDRESS(OMAP_UART2_BASE),
            .mapbase    = (unsigned long)OMAP_UART2_BASE,
            .irq        = 73,
            .flags            = UPF_BOOT_AUTOCONF,
            .iotype           = UPIO_MEM,
            .regshift   = 2,
            .uartclk    = OMAP16XX_BASE_BAUD * 16,
      }, {
            .membase    = (char *)IO_ADDRESS(OMAP_UART3_BASE),
            .mapbase    = (unsigned long)OMAP_UART3_BASE,
            .irq        = 74,
            .flags            = UPF_BOOT_AUTOCONF,
            .iotype           = UPIO_MEM,
            .regshift   = 2,
            .uartclk    = OMAP16XX_BASE_BAUD * 16,
      }, {
            .flags            = 0
      }
};

static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
                                 int offset)
{
      offset <<= up->regshift;
      return (unsigned int)__raw_readb(up->membase + offset);
}

static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
                            int value)
{
      offset <<= p->regshift;
      __raw_writeb(value, (unsigned long)(p->membase + offset));
}

/*
 * Internal UARTs need to be initialized for the 8250 autoconfig to work
 * properly. Note that the TX watermark initialization may not be needed
 * once the 8250.c watermark handling code is merged.
 */
static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
{
      serial_write_reg(p, UART_OMAP_MDR1, 0x07);
      serial_write_reg(p, UART_OMAP_SCR, 0x08);
      serial_write_reg(p, UART_OMAP_MDR1, 0x00);
      serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
}

void __init omap_serial_init()
{
      int i;
      const struct omap_uart_config *info;

      /*
       * Make sure the serial ports are muxed on at this point.
       * You have to mux them off in device drivers later on
       * if not needed.
       */

      info = omap_get_config(OMAP_TAG_UART,
                         struct omap_uart_config);

      if (info == NULL)
            return;

      for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
            struct plat_serial8250_port *p = serial_platform_data + i;

            if (!(info->enabled_uarts & (1 << i))) {
                  p->membase = 0;
                  p->mapbase = 0;
                  continue;
            }

            switch (i) {
            case 0:
                  uart1_ick = clk_get(NULL, "uart1_ick");
                  if (IS_ERR(uart1_ick))
                        printk("Could not get uart1_ick\n");
                  else {
                        clk_enable(uart1_ick);
                  }

                  uart1_fck = clk_get(NULL, "uart1_fck");
                  if (IS_ERR(uart1_fck))
                        printk("Could not get uart1_fck\n");
                  else {
                        clk_enable(uart1_fck);
                  }
                  break;
            case 1:
                  uart2_ick = clk_get(NULL, "uart2_ick");
                  if (IS_ERR(uart2_ick))
                        printk("Could not get uart2_ick\n");
                  else {
                        clk_enable(uart2_ick);
                  }

                  uart2_fck = clk_get(NULL, "uart2_fck");
                  if (IS_ERR(uart2_fck))
                        printk("Could not get uart2_fck\n");
                  else {
                        clk_enable(uart2_fck);
                  }
                  break;
            case 2:
                  uart3_ick = clk_get(NULL, "uart3_ick");
                  if (IS_ERR(uart3_ick))
                        printk("Could not get uart3_ick\n");
                  else {
                        clk_enable(uart3_ick);
                  }

                  uart3_fck = clk_get(NULL, "uart3_fck");
                  if (IS_ERR(uart3_fck))
                        printk("Could not get uart3_fck\n");
                  else {
                        clk_enable(uart3_fck);
                  }
                  break;
            }

            omap_serial_reset(p);
      }
}

static struct platform_device serial_device = {
      .name             = "serial8250",
      .id               = PLAT8250_DEV_PLATFORM,
      .dev              = {
            .platform_data    = serial_platform_data,
      },
};

static int __init omap_init(void)
{
      return platform_device_register(&serial_device);
}
arch_initcall(omap_init);

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