1/*
  2 * gpmc-nand.c
  3 *
  4 * Copyright (C) 2009 Texas Instruments
  5 * Vimal Singh <vimalsingh@ti.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/platform_device.h>
 14#include <linux/io.h>
 15#include <linux/mtd/nand.h>
 16
 17#include <asm/mach/flash.h>
 18
 19#include <plat/cpu.h>
 20#include <plat/nand.h>
 21#include <plat/board.h>
 22#include <plat/gpmc.h>
 23
 24static struct resource gpmc_nand_resource = {
 25	.flags		= IORESOURCE_MEM,
 26};
 27
 28static struct platform_device gpmc_nand_device = {
 29	.name		= "omap2-nand",
 30	.id		= 0,
 31	.num_resources	= 1,
 32	.resource	= &gpmc_nand_resource,
 33};
 34
 35static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
 36{
 37	struct gpmc_timings t;
 38	int err;
 39
 40	if (!gpmc_nand_data->gpmc_t)
 41		return 0;
 42
 43	memset(&t, 0, sizeof(t));
 44	t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
 45	t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
 46	t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
 47
 48	/* Read */
 49	t.adv_rd_off = gpmc_round_ns_to_ticks(
 50				gpmc_nand_data->gpmc_t->adv_rd_off);
 51	t.oe_on  = t.adv_on;
 52	t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
 53	t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
 54	t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
 55	t.rd_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
 56
 57	/* Write */
 58	t.adv_wr_off = gpmc_round_ns_to_ticks(
 59				gpmc_nand_data->gpmc_t->adv_wr_off);
 60	t.we_on  = t.oe_on;
 61	if (cpu_is_omap34xx()) {
 62	    t.wr_data_mux_bus =	gpmc_round_ns_to_ticks(
 63				gpmc_nand_data->gpmc_t->wr_data_mux_bus);
 64	    t.wr_access = gpmc_round_ns_to_ticks(
 65				gpmc_nand_data->gpmc_t->wr_access);
 66	}
 67	t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
 68	t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
 69	t.wr_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
 70
 71	/* Configure GPMC */
 72	if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
 73		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
 74	else
 75		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
 76	gpmc_cs_configure(gpmc_nand_data->cs,
 77			GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
 78	err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
 79	if (err)
 80		return err;
 81
 82	return 0;
 83}
 84
 85int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data)
 86{
 87	int err	= 0;
 88	struct device *dev = &gpmc_nand_device.dev;
 89
 90	gpmc_nand_device.dev.platform_data = gpmc_nand_data;
 91
 92	err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
 93				&gpmc_nand_data->phys_base);
 94	if (err < 0) {
 95		dev_err(dev, "Cannot request GPMC CS\n");
 96		return err;
 97	}
 98
 99	 /* Set timings in GPMC */
100	err = omap2_nand_gpmc_retime(gpmc_nand_data);
101	if (err < 0) {
102		dev_err(dev, "Unable to set gpmc timings: %d\n", err);
103		return err;
104	}
105
106	/* Enable RD PIN Monitoring Reg */
107	if (gpmc_nand_data->dev_ready) {
108		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
109	}
110
111	err = platform_device_register(&gpmc_nand_device);
112	if (err < 0) {
113		dev_err(dev, "Unable to register NAND device\n");
114		goto out_free_cs;
115	}
116
117	return 0;
118
119out_free_cs:
120	gpmc_cs_free(gpmc_nand_data->cs);
121
122	return err;
123}