/*
 * linux/arch/arm/mach-omap2/gpmc-smc91x.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Contact:     Tony Lindgren
 *
 * 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/kernel.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/smc91x.h>

#include "gpmc.h"
#include "gpmc-smc91x.h"

#include "soc.h"

static struct omap_smc91x_platform_data *gpmc_cfg;

static struct resource gpmc_smc91x_resources[] = {
        [0] = {
                .flags          = IORESOURCE_MEM,
        },
        [1] = {
                .flags          = IORESOURCE_IRQ,
        },
};

static struct smc91x_platdata gpmc_smc91x_info = {
        .flags  = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0,
        .leda   = RPC_LED_100_10,
        .ledb   = RPC_LED_TX_RX,
};

static struct platform_device gpmc_smc91x_device = {
        .name           = "smc91x",
        .id             = -1,
        .dev            = {
                .platform_data = &gpmc_smc91x_info,
        },
        .num_resources  = ARRAY_SIZE(gpmc_smc91x_resources),
        .resource       = gpmc_smc91x_resources,
};

static struct gpmc_settings smc91x_settings = {
        .device_width = GPMC_DEVWIDTH_16BIT,
};

/*
 * Set the gpmc timings for smc91c96. The timings are taken
 * from the data sheet available at:
 * http://www.smsc.com/main/catalog/lan91c96.html
 * REVISIT: Level shifters can add at least to the access latency.
 */
static int smc91c96_gpmc_retime(void)
{
        struct gpmc_timings t;
        struct gpmc_device_timings dev_t;
        const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
        const int t4_r = 20;    /* Figure 12.2 read */
        const int t4_w = 5;     /* Figure 12.4 write */
        const int t5 = 25;      /* Figure 12.2 read */
        const int t6 = 15;      /* Figure 12.2 read */
        const int t7 = 5;       /* Figure 12.4 write */
        const int t8 = 5;       /* Figure 12.4 write */
        const int t20 = 185;    /* Figure 12.2 read and 12.4 write */

        /*
         * FIXME: Calculate the address and data bus muxed timings.
         * Note that at least adv_rd_off needs to be changed according
         * to omap3430 TRM Figure 11-11. Are the sdp boards using the
         * FPGA in between smc91x and omap as the timings are different
         * from above?
         */
        if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
                return 0;

        memset(&dev_t, 0, sizeof(dev_t));

        dev_t.t_oeasu = t3 * 1000;
        dev_t.t_oe = t5 * 1000;
        dev_t.t_cez_r = t4_r * 1000;
        dev_t.t_oez = t6 * 1000;
        dev_t.t_rd_cycle = (t20 - t3) * 1000;

        dev_t.t_weasu = t3 * 1000;
        dev_t.t_wpl = t7 * 1000;
        dev_t.t_wph = t8 * 1000;
        dev_t.t_cez_w = t4_w * 1000;
        dev_t.t_wr_cycle = (t20 - t3) * 1000;

        gpmc_calc_timings(&t, &smc91x_settings, &dev_t);

        return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
}

/*
 * Initialize smc91x device connected to the GPMC. Note that we
 * assume that pin multiplexing is done in the board-*.c file,
 * or in the bootloader.
 */
void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
{
        unsigned long cs_mem_base;
        int ret;

        gpmc_cfg = board_data;

        if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
                gpmc_cfg->retime = smc91c96_gpmc_retime;

        if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
                printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
                return;
        }

        gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
        gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
        gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);

        if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
                smc91x_settings.mux_add_data = GPMC_MUX_AD;
        if (gpmc_cfg->flags & GPMC_READ_MON)
                smc91x_settings.wait_on_read = true;
        if (gpmc_cfg->flags & GPMC_WRITE_MON)
                smc91x_settings.wait_on_write = true;
        if (gpmc_cfg->wait_pin)
                smc91x_settings.wait_pin = gpmc_cfg->wait_pin;
        ret = gpmc_cs_program_settings(gpmc_cfg->cs, &smc91x_settings);
        if (ret < 0)
                goto free1;

        if (gpmc_cfg->retime) {
                ret = gpmc_cfg->retime();
                if (ret != 0)
                        goto free1;
        }

        if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
                goto free1;

        gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);

        if (gpmc_cfg->gpio_pwrdwn) {
                ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
                                       GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
                if (ret)
                        goto free2;
        }

        if (gpmc_cfg->gpio_reset) {
                ret = gpio_request_one(gpmc_cfg->gpio_reset,
                                       GPIOF_OUT_INIT_LOW, "SMC91X reset");
                if (ret)
                        goto free3;

                gpio_set_value(gpmc_cfg->gpio_reset, 1);
                msleep(100);
                gpio_set_value(gpmc_cfg->gpio_reset, 0);
        }

        if (platform_device_register(&gpmc_smc91x_device) < 0) {
                printk(KERN_ERR "Unable to register smc91x device\n");
                gpio_free(gpmc_cfg->gpio_reset);
                goto free3;
        }

        return;

free3:
        if (gpmc_cfg->gpio_pwrdwn)
                gpio_free(gpmc_cfg->gpio_pwrdwn);
free2:
        gpio_free(gpmc_cfg->gpio_irq);
free1:
        gpmc_cs_free(gpmc_cfg->cs);

        printk(KERN_ERR "Could not initialize smc91x\n");
}