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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | /* * drivers/mtd/nand/orion_nand.c * * NAND support for Marvell Orion SoC platforms * * Tzachi Perelstein <tzachi@marvell.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/slab.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/partitions.h> #include <asm/io.h> #include <asm/sizes.h> #include <mach/hardware.h> #include <plat/orion_nand.h> #ifdef CONFIG_MTD_CMDLINE_PARTS static const char *part_probes[] = { "cmdlinepart", NULL }; #endif static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *nc = mtd->priv; struct orion_nand_data *board = nc->priv; u32 offs; if (cmd == NAND_CMD_NONE) return; if (ctrl & NAND_CLE) offs = (1 << board->cle); else if (ctrl & NAND_ALE) offs = (1 << board->ale); else return; if (nc->options & NAND_BUSWIDTH_16) offs <<= 1; writeb(cmd, nc->IO_ADDR_W + offs); } static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) { struct nand_chip *chip = mtd->priv; void __iomem *io_base = chip->IO_ADDR_R; uint64_t *buf64; int i = 0; while (len && (unsigned long)buf & 7) { *buf++ = readb(io_base); len--; } buf64 = (uint64_t *)buf; while (i < len/8) { uint64_t x; asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base)); buf64[i++] = x; } i *= 8; while (i < len) buf[i++] = readb(io_base); } static int __init orion_nand_probe(struct platform_device *pdev) { struct mtd_info *mtd; struct nand_chip *nc; struct orion_nand_data *board; void __iomem *io_base; int ret = 0; #ifdef CONFIG_MTD_PARTITIONS struct mtd_partition *partitions = NULL; int num_part = 0; #endif nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL); if (!nc) { printk(KERN_ERR "orion_nand: failed to allocate device structure.\n"); ret = -ENOMEM; goto no_res; } mtd = (struct mtd_info *)(nc + 1); io_base = ioremap(pdev->resource[0].start, pdev->resource[0].end - pdev->resource[0].start + 1); if (!io_base) { printk(KERN_ERR "orion_nand: ioremap failed\n"); ret = -EIO; goto no_res; } board = pdev->dev.platform_data; mtd->priv = nc; mtd->owner = THIS_MODULE; nc->priv = board; nc->IO_ADDR_R = nc->IO_ADDR_W = io_base; nc->cmd_ctrl = orion_nand_cmd_ctrl; nc->read_buf = orion_nand_read_buf; nc->ecc.mode = NAND_ECC_SOFT; if (board->chip_delay) nc->chip_delay = board->chip_delay; if (board->width == 16) nc->options |= NAND_BUSWIDTH_16; platform_set_drvdata(pdev, mtd); if (nand_scan(mtd, 1)) { ret = -ENXIO; goto no_dev; } #ifdef CONFIG_MTD_PARTITIONS #ifdef CONFIG_MTD_CMDLINE_PARTS mtd->name = "orion_nand"; num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0); #endif /* If cmdline partitions have been passed, let them be used */ if (num_part <= 0) { num_part = board->nr_parts; partitions = board->parts; } if (partitions && num_part > 0) ret = add_mtd_partitions(mtd, partitions, num_part); else ret = add_mtd_device(mtd); #else ret = add_mtd_device(mtd); #endif if (ret) { nand_release(mtd); goto no_dev; } return 0; no_dev: platform_set_drvdata(pdev, NULL); iounmap(io_base); no_res: kfree(nc); return ret; } static int __devexit orion_nand_remove(struct platform_device *pdev) { struct mtd_info *mtd = platform_get_drvdata(pdev); struct nand_chip *nc = mtd->priv; nand_release(mtd); iounmap(nc->IO_ADDR_W); kfree(nc); return 0; } static struct platform_driver orion_nand_driver = { .remove = __devexit_p(orion_nand_remove), .driver = { .name = "orion_nand", .owner = THIS_MODULE, }, }; static int __init orion_nand_init(void) { return platform_driver_probe(&orion_nand_driver, orion_nand_probe); } static void __exit orion_nand_exit(void) { platform_driver_unregister(&orion_nand_driver); } module_init(orion_nand_init); module_exit(orion_nand_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Tzachi Perelstein"); MODULE_DESCRIPTION("NAND glue for Orion platforms"); MODULE_ALIAS("platform:orion_nand"); |