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 #include <linux/platform_data/mtd-nand-omap2.h>
  17
  18 #include <asm/mach/flash.h>
  19
  20 #include <plat/gpmc.h>
  21
  22 #include "soc.h"
  23
  24 static struct resource gpmc_nand_resource[] = {
  25         {
  26                 .flags          = IORESOURCE_MEM,
  27         },
  28         {
  29                 .flags          = IORESOURCE_IRQ,
  30         },
  31         {
  32                 .flags          = IORESOURCE_IRQ,
  33         },
  34 };
  35
  36 static struct platform_device gpmc_nand_device = {
  37         .name           = "omap2-nand",
  38         .id             = 0,
  39         .num_resources  = ARRAY_SIZE(gpmc_nand_resource),
  40         .resource       = gpmc_nand_resource,
  41 };
  42
  43 static int omap2_nand_gpmc_retime(struct omap_nand_platform_data *gpmc_nand_data)
  44 {
  45         struct gpmc_timings t;
  46         int err;
  47
  48         if (!gpmc_nand_data->gpmc_t)
  49                 return 0;
  50
  51         memset(&t, 0, sizeof(t));
  52         t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
  53         t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
  54         t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
  55
  56         /* Read */
  57         t.adv_rd_off = gpmc_round_ns_to_ticks(
  58                                 gpmc_nand_data->gpmc_t->adv_rd_off);
  59         t.oe_on  = t.adv_on;
  60         t.access = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->access);
  61         t.oe_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->oe_off);
  62         t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_rd_off);
  63         t.rd_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->rd_cycle);
  64
  65         /* Write */
  66         t.adv_wr_off = gpmc_round_ns_to_ticks(
  67                                 gpmc_nand_data->gpmc_t->adv_wr_off);
  68         t.we_on  = t.oe_on;
  69         if (cpu_is_omap34xx()) {
  70             t.wr_data_mux_bus = gpmc_round_ns_to_ticks(
  71                                 gpmc_nand_data->gpmc_t->wr_data_mux_bus);
  72             t.wr_access = gpmc_round_ns_to_ticks(
  73                                 gpmc_nand_data->gpmc_t->wr_access);
  74         }
  75         t.we_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->we_off);
  76         t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_wr_off);
  77         t.wr_cycle  = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->wr_cycle);
  78
  79         /* Configure GPMC */
  80         if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16)
  81                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1);
  82         else
  83                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0);
  84         gpmc_cs_configure(gpmc_nand_data->cs,
  85                         GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND);
  86         gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_WP, 0);
  87         err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t);
  88         if (err)
  89                 return err;
  90
  91         return 0;
  92 }
  93
  94 int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data)
  95 {
  96         int err = 0;
  97         struct device *dev = &gpmc_nand_device.dev;
  98
  99         gpmc_nand_device.dev.platform_data = gpmc_nand_data;
 100
 101         err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
 102                                 (unsigned long *)&gpmc_nand_resource[0].start);
 103         if (err < 0) {
 104                 dev_err(dev, "Cannot request GPMC CS\n");
 105                 return err;
 106         }
 107
 108         gpmc_nand_resource[0].end = gpmc_nand_resource[0].start +
 109                                                         NAND_IO_SIZE - 1;
 110
 111         gpmc_nand_resource[1].start =
 112                                 gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE);
 113         gpmc_nand_resource[2].start =
 114                                 gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT);
 115          /* Set timings in GPMC */
 116         err = omap2_nand_gpmc_retime(gpmc_nand_data);
 117         if (err < 0) {
 118                 dev_err(dev, "Unable to set gpmc timings: %d\n", err);
 119                 return err;
 120         }
 121
 122         /* Enable RD PIN Monitoring Reg */
 123         if (gpmc_nand_data->dev_ready) {
 124                 gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1);
 125         }
 126
 127         gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs);
 128
 129         err = platform_device_register(&gpmc_nand_device);
 130         if (err < 0) {
 131                 dev_err(dev, "Unable to register NAND device\n");
 132                 goto out_free_cs;
 133         }
 134
 135         return 0;
 136
 137 out_free_cs:
 138         gpmc_cs_free(gpmc_nand_data->cs);
 139
 140         return err;
 141 }