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/nand.h>
 20#include <plat/board.h>
 21#include <plat/gpmc.h>
 22
 23static struct resource gpmc_nand_resource = {
 24	.flags		= IORESOURCE_MEM,
 25};
 26
 27static struct platform_device gpmc_nand_device = {
 28	.name		= "omap2-nand",
 29	.id		= 0,
 30	.num_resources	= 1,
 31	.resource	= &gpmc_nand_resource,
 32};
 33
 34static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
 35{
 36	struct gpmc_timings t;
 37	int err;
 38
 39	if (!gpmc_nand_data->gpmc_t)
 40		return 0;
 41
 42	memset(&t, 0, sizeof(t));
 43	t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
 44	t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
 45	t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
 46
 47	/* Read */
 48	t.adv_rd_off = gpmc_round_ns_to_ticks(
 49				gpmc_nand_data->gpmc_t->adv_rd_off);
 50	t.oe_on  = t.adv_on;
 51	t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
 52	t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
 53	t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
 54	t.rd_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
 55
 56	/* Write */
 57	t.adv_wr_off = gpmc_round_ns_to_ticks(
 58				gpmc_nand_data->gpmc_t->adv_wr_off);
 59	t.we_on  = t.oe_on;
 60	if (cpu_is_omap34xx()) {
 61	    t.wr_data_mux_bus =	gpmc_round_ns_to_ticks(
 62				gpmc_nand_data->gpmc_t->wr_data_mux_bus);
 63	    t.wr_access = gpmc_round_ns_to_ticks(
 64				gpmc_nand_data->gpmc_t->wr_access);
 65	}
 66	t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
 67	t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
 68	t.wr_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
 69
 70	/* Configure GPMC */
 71	if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
 72		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
 73	else
 74		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
 75	gpmc_cs_configure(gpmc_nand_data->cs,
 76			GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
 77	err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
 78	if (err)
 79		return err;
 80
 81	return 0;
 82}
 83
 84int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data)
 85{
 86	int err	= 0;
 87	struct device *dev = &gpmc_nand_device.dev;
 88
 89	gpmc_nand_device.dev.platform_data = gpmc_nand_data;
 90
 91	err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
 92				&gpmc_nand_data->phys_base);
 93	if (err < 0) {
 94		dev_err(dev, "Cannot request GPMC CS\n");
 95		return err;
 96	}
 97
 98	 /* Set timings in GPMC */
 99	err = omap2_nand_gpmc_retime(gpmc_nand_data);
100	if (err < 0) {
101		dev_err(dev, "Unable to set gpmc timings: %d\n", err);
102		return err;
103	}
104
105	/* Enable RD PIN Monitoring Reg */
106	if (gpmc_nand_data->dev_ready) {
107		gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
108	}
109
110	err = platform_device_register(&gpmc_nand_device);
111	if (err < 0) {
112		dev_err(dev, "Unable to register NAND device\n");
113		goto out_free_cs;
114	}
115
116	return 0;
117
118out_free_cs:
119	gpmc_cs_free(gpmc_nand_data->cs);
120
121	return err;
122}