arch/arm/mach-omap2/gpmc-nand.c

   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
  23 static struct omap_nand_platform_data *gpmc_nand_data;
  24
  25 static struct resource gpmc_nand_resource = {
  26         .flags          = IORESOURCE_MEM,
  27 };
  28
  29 static struct platform_device gpmc_nand_device = {
  30         .name           = "omap2-nand",
  31         .id             = 0,
  32         .num_resources  = 1,
  33         .resource       = &gpmc_nand_resource,
  34 };
  35
  36 static int omap2_nand_gpmc_retime(void)
  37 {
  38         struct gpmc_timings t;
  39         int err;
  40
  41         if (!gpmc_nand_data->gpmc_t)
  42                 return 0;
  43
  44         memset(&t, 0, sizeof(t));
  45         t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
  46         t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
  47         t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
  48
  49         /* Read */
  50         t.adv_rd_off = gpmc_round_ns_to_ticks(
  51                                 gpmc_nand_data->gpmc_t->adv_rd_off);
  52         t.oe_on  = t.adv_on;
  53         t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
  54         t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
  55         t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
  56         t.rd_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
  57
  58         /* Write */
  59         t.adv_wr_off = gpmc_round_ns_to_ticks(
  60                                 gpmc_nand_data->gpmc_t->adv_wr_off);
  61         t.we_on  = t.oe_on;
  62         if (cpu_is_omap34xx()) {
  63             t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
  64                                 gpmc_nand_data->gpmc_t->wr_data_mux_bus);
  65             t.wr_access = gpmc_round_ns_to_ticks(
  66                                 gpmc_nand_data->gpmc_t->wr_access);
  67         }
  68         t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
  69         t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
  70         t.wr_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
  71
  72         /* Configure GPMC */
  73         if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
  74                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
  75         else
  76                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
  77         gpmc_cs_configure(gpmc_nand_data->cs,
  78                         GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
  79         err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
  80         if (err)
  81                 return err;
  82
  83         return 0;
  84 }
  85
  86 int __init gpmc_nand_init(struct omap_nand_platform_data *_nand_data)
  87 {
  88         int err = 0;
  89         struct device *dev = &gpmc_nand_device.dev;
  90
  91         gpmc_nand_data = _nand_data;
  92         gpmc_nand_data->nand_setup = omap2_nand_gpmc_retime;
  93         gpmc_nand_device.dev.platform_data = gpmc_nand_data;
  94
  95         err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
  96                                 &gpmc_nand_data->phys_base);
  97         if (err < 0) {
  98                 dev_err(dev, "Cannot request GPMC CS\n");
  99                 return err;
 100         }
 101
 102          /* Set timings in GPMC */
 103         err = omap2_nand_gpmc_retime();
 104         if (err < 0) {
 105                 dev_err(dev, "Unable to set gpmc timings: %d\n", err);
 106                 return err;
 107         }
 108
 109         /* Enable RD PIN Monitoring Reg */
 110         if (gpmc_nand_data->dev_ready) {
 111                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
 112         }
 113
 114         err = platform_device_register(&gpmc_nand_device);
 115         if (err < 0) {
 116                 dev_err(dev, "Unable to register NAND device\n");
 117                 goto out_free_cs;
 118         }
 119
 120         return 0;
 121
 122 out_free_cs:
 123         gpmc_cs_free(gpmc_nand_data->cs);
 124
 125         return err;
 126 }