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 | |
Afzal Mohammed | 3ef5d00 | 2012-10-05 10:37:27 +0530 | [diff] [blame] | 20 | #include "gpmc.h" |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 21 | #include "soc.h" |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 22 | #include "gpmc-nand.h" |
| 23 | |
| 24 | /* minimum size for IO mapping */ |
| 25 | #define NAND_IO_SIZE 4 |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 26 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 27 | static struct resource gpmc_nand_resource[] = { |
| 28 | { |
| 29 | .flags = IORESOURCE_MEM, |
| 30 | }, |
| 31 | { |
| 32 | .flags = IORESOURCE_IRQ, |
| 33 | }, |
| 34 | { |
| 35 | .flags = IORESOURCE_IRQ, |
| 36 | }, |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 37 | }; |
| 38 | |
| 39 | static struct platform_device gpmc_nand_device = { |
| 40 | .name = "omap2-nand", |
| 41 | .id = 0, |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 42 | .num_resources = ARRAY_SIZE(gpmc_nand_resource), |
| 43 | .resource = gpmc_nand_resource, |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 44 | }; |
| 45 | |
Daniel Mack | 504f3c6 | 2012-12-14 11:36:42 +0100 | [diff] [blame] | 46 | static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt) |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame] | 47 | { |
| 48 | /* support only OMAP3 class */ |
Daniel Mack | f50a038 | 2012-12-14 11:36:43 +0100 | [diff] [blame] | 49 | if (!cpu_is_omap34xx() && !soc_is_am33xx()) { |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame] | 50 | pr_err("BCH ecc is not supported on this CPU\n"); |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | /* |
Daniel Mack | f50a038 | 2012-12-14 11:36:43 +0100 | [diff] [blame] | 55 | * For now, assume 4-bit mode is only supported on OMAP3630 ES1.x, x>=1 |
| 56 | * and AM33xx derivates. Other chips may be added if confirmed to work. |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame] | 57 | */ |
| 58 | if ((ecc_opt == OMAP_ECC_BCH4_CODE_HW) && |
Daniel Mack | f50a038 | 2012-12-14 11:36:43 +0100 | [diff] [blame] | 59 | (!cpu_is_omap3630() || (GET_OMAP_REVISION() == 0)) && |
| 60 | (!soc_is_am33xx())) { |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame] | 61 | pr_err("BCH 4-bit mode is not supported on this CPU\n"); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | return 1; |
| 66 | } |
| 67 | |
Ezequiel Garcia | d0020cc | 2013-10-27 21:51:47 -0300 | [diff] [blame] | 68 | /* This function will go away once the device-tree convertion is complete */ |
| 69 | static void gpmc_set_legacy(struct omap_nand_platform_data *gpmc_nand_data, |
| 70 | struct gpmc_settings *s) |
| 71 | { |
| 72 | /* Enable RD PIN Monitoring Reg */ |
| 73 | if (gpmc_nand_data->dev_ready) { |
| 74 | s->wait_on_read = true; |
| 75 | s->wait_on_write = true; |
| 76 | } |
Ezequiel Garcia | bbc28cd | 2013-10-27 21:51:48 -0300 | [diff] [blame] | 77 | |
| 78 | if (gpmc_nand_data->devsize == NAND_BUSWIDTH_16) |
| 79 | s->device_width = GPMC_DEVWIDTH_16BIT; |
| 80 | else |
| 81 | s->device_width = GPMC_DEVWIDTH_8BIT; |
Ezequiel Garcia | d0020cc | 2013-10-27 21:51:47 -0300 | [diff] [blame] | 82 | } |
| 83 | |
Daniel Mack | 504f3c6 | 2012-12-14 11:36:42 +0100 | [diff] [blame] | 84 | int gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data, |
| 85 | struct gpmc_timings *gpmc_t) |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 86 | { |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 87 | int err = 0; |
Jon Hunter | 24db7ec | 2013-02-21 15:43:08 -0600 | [diff] [blame] | 88 | struct gpmc_settings s; |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 89 | struct device *dev = &gpmc_nand_device.dev; |
| 90 | |
Jon Hunter | 24db7ec | 2013-02-21 15:43:08 -0600 | [diff] [blame] | 91 | memset(&s, 0, sizeof(struct gpmc_settings)); |
| 92 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 93 | gpmc_nand_device.dev.platform_data = gpmc_nand_data; |
| 94 | |
| 95 | err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE, |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 96 | (unsigned long *)&gpmc_nand_resource[0].start); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 97 | if (err < 0) { |
Ezequiel Garcia | 097c9da | 2013-02-12 16:22:20 -0300 | [diff] [blame] | 98 | dev_err(dev, "Cannot request GPMC CS %d, error %d\n", |
| 99 | gpmc_nand_data->cs, err); |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 100 | return err; |
| 101 | } |
| 102 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 103 | gpmc_nand_resource[0].end = gpmc_nand_resource[0].start + |
| 104 | NAND_IO_SIZE - 1; |
Afzal Mohammed | 9222e3a | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 105 | |
Afzal Mohammed | 2ee30f0 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 106 | gpmc_nand_resource[1].start = |
| 107 | gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE); |
| 108 | gpmc_nand_resource[2].start = |
| 109 | gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT); |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 110 | |
| 111 | if (gpmc_t) { |
Christoph Fritz | 4d58436 | 2013-04-19 18:29:41 +0200 | [diff] [blame] | 112 | err = gpmc_cs_set_timings(gpmc_nand_data->cs, gpmc_t); |
Afzal Mohammed | bc3668e | 2012-09-29 12:26:13 +0530 | [diff] [blame] | 113 | if (err < 0) { |
| 114 | dev_err(dev, "Unable to set gpmc timings: %d\n", err); |
| 115 | return err; |
| 116 | } |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 117 | } |
| 118 | |
Ezequiel Garcia | d0020cc | 2013-10-27 21:51:47 -0300 | [diff] [blame] | 119 | if (gpmc_nand_data->of_node) |
Ezequiel Garcia | e2e699b | 2013-10-27 21:51:46 -0300 | [diff] [blame] | 120 | gpmc_read_settings_dt(gpmc_nand_data->of_node, &s); |
Ezequiel Garcia | d0020cc | 2013-10-27 21:51:47 -0300 | [diff] [blame] | 121 | else |
| 122 | gpmc_set_legacy(gpmc_nand_data, &s); |
Ezequiel Garcia | e2e699b | 2013-10-27 21:51:46 -0300 | [diff] [blame] | 123 | |
| 124 | s.device_nand = true; |
| 125 | |
Ezequiel Garcia | e2e699b | 2013-10-27 21:51:46 -0300 | [diff] [blame] | 126 | err = gpmc_cs_program_settings(gpmc_nand_data->cs, &s); |
| 127 | if (err < 0) |
| 128 | goto out_free_cs; |
| 129 | |
| 130 | err = gpmc_configure(GPMC_CONFIG_WP, 0); |
| 131 | if (err < 0) |
| 132 | goto out_free_cs; |
| 133 | |
Afzal Mohammed | d126d01 | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 134 | gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs); |
| 135 | |
Afzal Mohammed | 3852ccd | 2012-10-01 02:47:28 +0530 | [diff] [blame] | 136 | if (!gpmc_hwecc_bch_capable(gpmc_nand_data->ecc_opt)) |
| 137 | return -EINVAL; |
| 138 | |
Vimal Singh | 2f70a1e | 2010-02-15 10:03:33 -0800 | [diff] [blame] | 139 | err = platform_device_register(&gpmc_nand_device); |
| 140 | if (err < 0) { |
| 141 | dev_err(dev, "Unable to register NAND device\n"); |
| 142 | goto out_free_cs; |
| 143 | } |
| 144 | |
| 145 | return 0; |
| 146 | |
| 147 | out_free_cs: |
| 148 | gpmc_cs_free(gpmc_nand_data->cs); |
| 149 | |
| 150 | return err; |
| 151 | } |