/*
 * 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 <plat/board.h>
#include <plat/gpmc.h>
#include <plat/gpmc-smc91x.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,
};

/*
 * 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;
        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 */
        u32 l;

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

        /* Read timings */
        t.cs_on = 0;
        t.adv_on = t.cs_on;
        t.oe_on = t.adv_on + t3;
        t.access = t.oe_on + t5;
        t.oe_off = t.access;
        t.adv_rd_off = t.oe_off + max(t4_r, t6);
        t.cs_rd_off = t.oe_off;
        t.rd_cycle = t20 - t.oe_on;

        /* Write timings */
        t.we_on = t.adv_on + t3;

        if (cpu_is_omap34xx() && (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)) {
                t.wr_data_mux_bus = t.we_on;
                t.we_off = t.wr_data_mux_bus + t7;
        } else
                t.we_off = t.we_on + t7;
        if (cpu_is_omap34xx())
                t.wr_access = t.we_off;
        t.adv_wr_off = t.we_off + max(t4_w, t8);
        t.cs_wr_off = t.we_off + t4_w;
        t.wr_cycle = t20 - t.we_on;

        l = GPMC_CONFIG1_DEVICESIZE_16;
        if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
                l |= GPMC_CONFIG1_MUXADDDATA;
        if (gpmc_cfg->flags & GPMC_READ_MON)
                l |= GPMC_CONFIG1_WAIT_READ_MON;
        if (gpmc_cfg->flags & GPMC_WRITE_MON)
                l |= GPMC_CONFIG1_WAIT_WRITE_MON;
        if (gpmc_cfg->wait_pin)
                l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
        gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);

        /*
         * 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;

        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->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");
}