Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 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> |
Sukumar Ghorai | d5ce2b6 | 2011-01-28 15:42:03 +0530 | [diff] [blame] | 15 | #include <linux/mtd/nand.h> |
Arnd Bergmann | 2203747 | 2012-08-24 15:21:06 +0200 | [diff] [blame] | 16 | #include <linux/platform_data/mtd-nand-omap2.h> |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 17 | |
| 18 | #include <asm/mach/flash.h> |
| 19 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 20 | #include <plat/gpmc.h> |
| 21 | |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 22 | #include "soc.h" |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 23 | #include "gpmc-nand.h" |
| 24 | |
| 25 | /* minimum size for IO mapping */ |
| 26 | #define NAND_IO_SIZE 4 |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 27 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 28 | static struct resource gpmc_nand_resource[] = { |
| 29 | { |
| 30 | .flags = IORESOURCE_MEM, |
| 31 | }, |
| 32 | { |
| 33 | .flags = IORESOURCE_IRQ, |
| 34 | }, |
| 35 | { |
| 36 | .flags = IORESOURCE_IRQ, |
| 37 | }, |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | static struct platform_device gpmc_nand_device = { |
| 41 | .name = "omap2-nand", |
| 42 | .id = 0, |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 43 | .num_resources = ARRAY_SIZE(gpmc_nand_resource), |
| 44 | .resource = gpmc_nand_resource, |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 45 | }; |
| 46 | |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 47 | static int omap2_nand_gpmc_retime( |
| 48 | struct omap_nand_platform_data *gpmc_nand_data, |
| 49 | struct gpmc_timings *gpmc_t) |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 50 | { |
| 51 | struct gpmc_timings t; |
| 52 | int err; |
| 53 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 54 | memset(&t, 0, sizeof(t)); |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 55 | t.sync_clk = gpmc_t->sync_clk; |
| 56 | t.cs_on = gpmc_round_ns_to_ticks(gpmc_t->cs_on); |
| 57 | t.adv_on = gpmc_round_ns_to_ticks(gpmc_t->adv_on); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 58 | |
| 59 | /* Read */ |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 60 | t.adv_rd_off = gpmc_round_ns_to_ticks(gpmc_t->adv_rd_off); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 61 | t.oe_on = t.adv_on; |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 62 | t.access = gpmc_round_ns_to_ticks(gpmc_t->access); |
| 63 | t.oe_off = gpmc_round_ns_to_ticks(gpmc_t->oe_off); |
| 64 | t.cs_rd_off = gpmc_round_ns_to_ticks(gpmc_t->cs_rd_off); |
| 65 | t.rd_cycle = gpmc_round_ns_to_ticks(gpmc_t->rd_cycle); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 66 | |
| 67 | /* Write */ |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 68 | t.adv_wr_off = gpmc_round_ns_to_ticks(gpmc_t->adv_wr_off); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 69 | t.we_on = t.oe_on; |
| 70 | if (cpu_is_omap34xx()) { |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 71 | t.wr_data_mux_bus = gpmc_round_ns_to_ticks(gpmc_t->wr_data_mux_bus); |
| 72 | t.wr_access = gpmc_round_ns_to_ticks(gpmc_t->wr_access); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 73 | } |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 74 | t.we_off = gpmc_round_ns_to_ticks(gpmc_t->we_off); |
| 75 | t.cs_wr_off = gpmc_round_ns_to_ticks(gpmc_t->cs_wr_off); |
| 76 | t.wr_cycle = gpmc_round_ns_to_ticks(gpmc_t->wr_cycle); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 77 | |
| 78 | /* Configure GPMC */ |
Sukumar Ghorai | d5ce2b6 | 2011-01-28 15:42:03 +0530 | [diff] [blame] | 79 | if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16) |
| 80 | gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 1); |
| 81 | else |
| 82 | gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_DEV_SIZE, 0); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 83 | gpmc_cs_configure(gpmc_nand_data->cs, |
| 84 | GPMC_CONFIG_DEV_TYPE, GPMC_DEVICETYPE_NAND); |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 85 | gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_WP, 0); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 86 | err = gpmc_cs_set_timings(gpmc_nand_data->cs, &t); |
| 87 | if (err) |
| 88 | return err; |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame^] | 93 | static bool __init gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt) |
| 94 | { |
| 95 | /* support only OMAP3 class */ |
| 96 | if (!cpu_is_omap34xx()) { |
| 97 | pr_err("BCH ecc is not supported on this CPU\n"); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * For now, assume 4-bit mode is only supported on OMAP3630 ES1.x, x>=1. |
| 103 | * Other chips may be added if confirmed to work. |
| 104 | */ |
| 105 | if ((ecc_opt == OMAP_ECC_BCH4_CODE_HW) && |
| 106 | (!cpu_is_omap3630() || (GET_OMAP_REVISION() == 0))) { |
| 107 | pr_err("BCH 4-bit mode is not supported on this CPU\n"); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | return 1; |
| 112 | } |
| 113 | |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 114 | int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data, |
| 115 | struct gpmc_timings *gpmc_t) |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 116 | { |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 117 | int err = 0; |
| 118 | struct device *dev = &gpmc_nand_device.dev; |
| 119 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 120 | gpmc_nand_device.dev.platform_data = gpmc_nand_data; |
| 121 | |
| 122 | err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE, |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 123 | (unsigned long *)&gpmc_nand_resource[0].start); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 124 | if (err < 0) { |
| 125 | dev_err(dev, "Cannot request GPMC CS\n"); |
| 126 | return err; |
| 127 | } |
| 128 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 129 | gpmc_nand_resource[0].end = gpmc_nand_resource[0].start + |
| 130 | NAND_IO_SIZE - 1; |
Afzal Mohammed | 9222e3a | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 131 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 132 | gpmc_nand_resource[1].start = |
| 133 | gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE); |
| 134 | gpmc_nand_resource[2].start = |
| 135 | gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT); |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 136 | |
| 137 | if (gpmc_t) { |
| 138 | err = omap2_nand_gpmc_retime(gpmc_nand_data, gpmc_t); |
| 139 | if (err < 0) { |
| 140 | dev_err(dev, "Unable to set gpmc timings: %d\n", err); |
| 141 | return err; |
| 142 | } |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | /* Enable RD PIN Monitoring Reg */ |
| 146 | if (gpmc_nand_data->dev_ready) { |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 147 | gpmc_cs_configure(gpmc_nand_data->cs, GPMC_CONFIG_RDY_BSY, 1); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 148 | } |
| 149 | |
Afzal Mohammed | d126d01 | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 150 | gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs); |
| 151 | |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame^] | 152 | if (!gpmc_hwecc_bch_capable(gpmc_nand_data->ecc_opt)) |
| 153 | return -EINVAL; |
| 154 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 155 | err = platform_device_register(&gpmc_nand_device); |
| 156 | if (err < 0) { |
| 157 | dev_err(dev, "Unable to register NAND device\n"); |
| 158 | goto out_free_cs; |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | |
| 163 | out_free_cs: |
| 164 | gpmc_cs_free(gpmc_nand_data->cs); |
| 165 | |
| 166 | return err; |
| 167 | } |