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/cpu.h>
  20 #include <plat/nand.h>
  21 #include <plat/board.h>
  22 #include <plat/gpmc.h>
  23
  24 static struct resource gpmc_nand_resource = {
  25         .flags          = IORESOURCE_MEM,
  26 };
  27
  28 static struct platform_device gpmc_nand_device = {
  29         .name           = "omap2-nand",
  30         .id             = 0,
  31         .num_resources  = 1,
  32         .resource       = &gpmc_nand_resource,
  33 };
  34
  35 static 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
  85 int __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
 119 out_free_cs:
 120         gpmc_cs_free(gpmc_nand_data->cs);
 121
 122         return err;
 123 }