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serial.c

/*
 * linux/arch/arm/mach-omap1/serial.c
 *
 * OMAP1 serial support.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>

#include <asm/io.h>
#include <asm/mach-types.h>

#include <asm/arch/board.h>
#include <asm/arch/mux.h>
#include <asm/arch/gpio.h>
#include <asm/arch/fpga.h>
#ifdef CONFIG_PM
#include <asm/arch/pm.h>
#endif

static struct clk * uart1_ck;
static struct clk * uart2_ck;
static struct clk * uart3_ck;

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

static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
                            int value)
{
      offset <<= p->regshift;
      __raw_writeb(value, 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 void __init omap_serial_reset(struct plat_serial8250_port *p)
{
      omap_serial_outp(p, UART_OMAP_MDR1, 0x07);      /* disable UART */
      omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
      omap_serial_outp(p, UART_OMAP_MDR1, 0x00);      /* enable UART */

      if (!cpu_is_omap15xx()) {
            omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
            while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
      }
}

static struct plat_serial8250_port serial_platform_data[] = {
      {
            .membase    = (char*)IO_ADDRESS(OMAP_UART1_BASE),
            .mapbase    = (unsigned long)OMAP_UART1_BASE,
            .irq        = INT_UART1,
            .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        = INT_UART2,
            .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        = INT_UART3,
            .flags            = UPF_BOOT_AUTOCONF,
            .iotype           = UPIO_MEM,
            .regshift   = 2,
            .uartclk    = OMAP16XX_BASE_BAUD * 16,
      },
      { },
};

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

/*
 * Note that on Innovator-1510 UART2 pins conflict with USB2.
 * By default UART2 does not work on Innovator-1510 if you have
 * USB OHCI enabled. To use UART2, you must disable USB2 first.
 */
void __init omap_serial_init(void)
{
      int i;
      const struct omap_uart_config *info;

      if (cpu_is_omap730()) {
            serial_platform_data[0].regshift = 0;
            serial_platform_data[1].regshift = 0;
            serial_platform_data[0].irq = INT_730_UART_MODEM_1;
            serial_platform_data[1].irq = INT_730_UART_MODEM_IRDA_2;
      }

      if (cpu_is_omap15xx()) {
            serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
            serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
            serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
      }

      info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
      if (info == NULL)
            return;

      for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
            unsigned char reg;

            if (!((1 << i) & info->enabled_uarts)) {
                  serial_platform_data[i].membase = NULL;
                  serial_platform_data[i].mapbase = 0;
                  continue;
            }

            switch (i) {
            case 0:
                  uart1_ck = clk_get(NULL, "uart1_ck");
                  if (IS_ERR(uart1_ck))
                        printk("Could not get uart1_ck\n");
                  else {
                        clk_enable(uart1_ck);
                        if (cpu_is_omap15xx())
                              clk_set_rate(uart1_ck, 12000000);
                  }
                  if (cpu_is_omap15xx()) {
                        omap_cfg_reg(UART1_TX);
                        omap_cfg_reg(UART1_RTS);
                        if (machine_is_omap_innovator()) {
                              reg = fpga_read(OMAP1510_FPGA_POWER);
                              reg |= OMAP1510_FPGA_PCR_COM1_EN;
                              fpga_write(reg, OMAP1510_FPGA_POWER);
                              udelay(10);
                        }
                  }
                  break;
            case 1:
                  uart2_ck = clk_get(NULL, "uart2_ck");
                  if (IS_ERR(uart2_ck))
                        printk("Could not get uart2_ck\n");
                  else {
                        clk_enable(uart2_ck);
                        if (cpu_is_omap15xx())
                              clk_set_rate(uart2_ck, 12000000);
                        else
                              clk_set_rate(uart2_ck, 48000000);
                  }
                  if (cpu_is_omap15xx()) {
                        omap_cfg_reg(UART2_TX);
                        omap_cfg_reg(UART2_RTS);
                        if (machine_is_omap_innovator()) {
                              reg = fpga_read(OMAP1510_FPGA_POWER);
                              reg |= OMAP1510_FPGA_PCR_COM2_EN;
                              fpga_write(reg, OMAP1510_FPGA_POWER);
                              udelay(10);
                        }
                  }
                  break;
            case 2:
                  uart3_ck = clk_get(NULL, "uart3_ck");
                  if (IS_ERR(uart3_ck))
                        printk("Could not get uart3_ck\n");
                  else {
                        clk_enable(uart3_ck);
                        if (cpu_is_omap15xx())
                              clk_set_rate(uart3_ck, 12000000);
                  }
                  if (cpu_is_omap15xx()) {
                        omap_cfg_reg(UART3_TX);
                        omap_cfg_reg(UART3_RX);
                  }
                  break;
            }
            omap_serial_reset(&serial_platform_data[i]);
      }
}

#ifdef CONFIG_OMAP_SERIAL_WAKE

static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
{
      /* Need to do something with serial port right after wake-up? */
      return IRQ_HANDLED;
}

/*
 * Reroutes serial RX lines to GPIO lines for the duration of
 * sleep to allow waking up the device from serial port even
 * in deep sleep.
 */
void omap_serial_wake_trigger(int enable)
{
      if (!cpu_is_omap16xx())
            return;

      if (uart1_ck != NULL) {
            if (enable)
                  omap_cfg_reg(V14_16XX_GPIO37);
            else
                  omap_cfg_reg(V14_16XX_UART1_RX);
      }
      if (uart2_ck != NULL) {
            if (enable)
                  omap_cfg_reg(R9_16XX_GPIO18);
            else
                  omap_cfg_reg(R9_16XX_UART2_RX);
      }
      if (uart3_ck != NULL) {
            if (enable)
                  omap_cfg_reg(L14_16XX_GPIO49);
            else
                  omap_cfg_reg(L14_16XX_UART3_RX);
      }
}

static void __init omap_serial_set_port_wakeup(int gpio_nr)
{
      int ret;

      ret = omap_request_gpio(gpio_nr);
      if (ret < 0) {
            printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
                   gpio_nr);
            return;
      }
      omap_set_gpio_direction(gpio_nr, 1);
      ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt,
                    IRQF_TRIGGER_RISING, "serial wakeup", NULL);
      if (ret) {
            omap_free_gpio(gpio_nr);
            printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
                   gpio_nr);
            return;
      }
      enable_irq_wake(OMAP_GPIO_IRQ(gpio_nr));
}

static int __init omap_serial_wakeup_init(void)
{
      if (!cpu_is_omap16xx())
            return 0;

      if (uart1_ck != NULL)
            omap_serial_set_port_wakeup(37);
      if (uart2_ck != NULL)
            omap_serial_set_port_wakeup(18);
      if (uart3_ck != NULL)
            omap_serial_set_port_wakeup(49);

      return 0;
}
late_initcall(omap_serial_wakeup_init);

#endif      /* CONFIG_OMAP_SERIAL_WAKE */

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

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