drivers/mtd/nand/raw/pasemi_nand.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2006-2007 PA Semi, Inc
   4  *
   5  * Author: Egor Martovetsky <egor@pasemi.com>
   6  * Maintained by: Olof Johansson <olof@lixom.net>
   7  *
   8  * Driver for the PWRficient onchip NAND flash interface
   9  */
  10
  11 #undef DEBUG
  12
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/rawnand.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pci.h>
  22
  23 #include <asm/io.h>
  24
  25 #define LBICTRL_LPCCTL_NR               0x00004000
  26 #define CLE_PIN_CTL                     15
  27 #define ALE_PIN_CTL                     14
  28
  29 static unsigned int lpcctl;
  30 static struct mtd_info *pasemi_nand_mtd;
  31 static struct nand_controller controller;
  32 static const char driver_name[] = "pasemi-nand";
  33
  34 static void pasemi_read_buf(struct nand_chip *chip, u_char *buf, int len)
  35 {
  36         while (len > 0x800) {
  37                 memcpy_fromio(buf, chip->legacy.IO_ADDR_R, 0x800);
  38                 buf += 0x800;
  39                 len -= 0x800;
  40         }
  41         memcpy_fromio(buf, chip->legacy.IO_ADDR_R, len);
  42 }
  43
  44 static void pasemi_write_buf(struct nand_chip *chip, const u_char *buf,
  45                              int len)
  46 {
  47         while (len > 0x800) {
  48                 memcpy_toio(chip->legacy.IO_ADDR_R, buf, 0x800);
  49                 buf += 0x800;
  50                 len -= 0x800;
  51         }
  52         memcpy_toio(chip->legacy.IO_ADDR_R, buf, len);
  53 }
  54
  55 static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,
  56                              unsigned int ctrl)
  57 {
  58         if (cmd == NAND_CMD_NONE)
  59                 return;
  60
  61         if (ctrl & NAND_CLE)
  62                 out_8(chip->legacy.IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
  63         else
  64                 out_8(chip->legacy.IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
  65
  66         /* Push out posted writes */
  67         eieio();
  68         inl(lpcctl);
  69 }
  70
  71 static int pasemi_device_ready(struct nand_chip *chip)
  72 {
  73         return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
  74 }
  75
  76 static int pasemi_attach_chip(struct nand_chip *chip)
  77 {
  78         chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
  79
  80         if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
  81                 chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
  82
  83         return 0;
  84 }
  85
  86 static const struct nand_controller_ops pasemi_ops = {
  87         .attach_chip = pasemi_attach_chip,
  88 };
  89
  90 static int pasemi_nand_probe(struct platform_device *ofdev)
  91 {
  92         struct device *dev = &ofdev->dev;
  93         struct pci_dev *pdev;
  94         struct device_node *np = dev->of_node;
  95         struct resource res;
  96         struct nand_chip *chip;
  97         int err = 0;
  98
  99         err = of_address_to_resource(np, 0, &res);
 100
 101         if (err)
 102                 return -EINVAL;
 103
 104         /* We only support one device at the moment */
 105         if (pasemi_nand_mtd)
 106                 return -ENODEV;
 107
 108         dev_dbg(dev, "pasemi_nand at %pR\n", &res);
 109
 110         /* Allocate memory for MTD device structure and private data */
 111         chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
 112         if (!chip) {
 113                 err = -ENOMEM;
 114                 goto out;
 115         }
 116
 117         controller.ops = &pasemi_ops;
 118         nand_controller_init(&controller);
 119         chip->controller = &controller;
 120
 121         pasemi_nand_mtd = nand_to_mtd(chip);
 122
 123         /* Link the private data with the MTD structure */
 124         pasemi_nand_mtd->dev.parent = dev;
 125
 126         chip->legacy.IO_ADDR_R = of_iomap(np, 0);
 127         chip->legacy.IO_ADDR_W = chip->legacy.IO_ADDR_R;
 128
 129         if (!chip->legacy.IO_ADDR_R) {
 130                 err = -EIO;
 131                 goto out_mtd;
 132         }
 133
 134         pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
 135         if (!pdev) {
 136                 err = -ENODEV;
 137                 goto out_ior;
 138         }
 139
 140         lpcctl = pci_resource_start(pdev, 0);
 141         pci_dev_put(pdev);
 142
 143         if (!request_region(lpcctl, 4, driver_name)) {
 144                 err = -EBUSY;
 145                 goto out_ior;
 146         }
 147
 148         chip->legacy.cmd_ctrl = pasemi_hwcontrol;
 149         chip->legacy.dev_ready = pasemi_device_ready;
 150         chip->legacy.read_buf = pasemi_read_buf;
 151         chip->legacy.write_buf = pasemi_write_buf;
 152         chip->legacy.chip_delay = 0;
 153
 154         /* Enable the following for a flash based bad block table */
 155         chip->bbt_options = NAND_BBT_USE_FLASH;
 156
 157         /* Scan to find existence of the device */
 158         err = nand_scan(chip, 1);
 159         if (err)
 160                 goto out_lpc;
 161
 162         if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
 163                 dev_err(dev, "Unable to register MTD device\n");
 164                 err = -ENODEV;
 165                 goto out_cleanup_nand;
 166         }
 167
 168         dev_info(dev, "PA Semi NAND flash at %pR, control at I/O %x\n", &res,
 169                  lpcctl);
 170
 171         return 0;
 172
 173  out_cleanup_nand:
 174         nand_cleanup(chip);
 175  out_lpc:
 176         release_region(lpcctl, 4);
 177  out_ior:
 178         iounmap(chip->legacy.IO_ADDR_R);
 179  out_mtd:
 180         kfree(chip);
 181  out:
 182         return err;
 183 }
 184
 185 static int pasemi_nand_remove(struct platform_device *ofdev)
 186 {
 187         struct nand_chip *chip;
 188         int ret;
 189
 190         if (!pasemi_nand_mtd)
 191                 return 0;
 192
 193         chip = mtd_to_nand(pasemi_nand_mtd);
 194
 195         /* Release resources, unregister device */
 196         ret = mtd_device_unregister(pasemi_nand_mtd);
 197         WARN_ON(ret);
 198         nand_cleanup(chip);
 199
 200         release_region(lpcctl, 4);
 201
 202         iounmap(chip->legacy.IO_ADDR_R);
 203
 204         /* Free the MTD device structure */
 205         kfree(chip);
 206
 207         pasemi_nand_mtd = NULL;
 208
 209         return 0;
 210 }
 211
 212 static const struct of_device_id pasemi_nand_match[] =
 213 {
 214         {
 215                 .compatible   = "pasemi,localbus-nand",
 216         },
 217         {},
 218 };
 219
 220 MODULE_DEVICE_TABLE(of, pasemi_nand_match);
 221
 222 static struct platform_driver pasemi_nand_driver =
 223 {
 224         .driver = {
 225                 .name = driver_name,
 226                 .of_match_table = pasemi_nand_match,
 227         },
 228         .probe          = pasemi_nand_probe,
 229         .remove         = pasemi_nand_remove,
 230 };
 231
 232 module_platform_driver(pasemi_nand_driver);
 233
 234 MODULE_LICENSE("GPL");
 235 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
 236 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");