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Linux/drivers/mtd/nand/pasemi_nand.c

  1 /*
  2  * Copyright (C) 2006-2007 PA Semi, Inc
  3  *
  4  * Author: Egor Martovetsky <egor@pasemi.com>
  5  * Maintained by: Olof Johansson <olof@lixom.net>
  6  *
  7  * Driver for the PWRficient onchip NAND flash interface
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  */
 22 
 23 #undef DEBUG
 24 
 25 #include <linux/slab.h>
 26 #include <linux/module.h>
 27 #include <linux/mtd/mtd.h>
 28 #include <linux/mtd/nand.h>
 29 #include <linux/mtd/nand_ecc.h>
 30 #include <linux/of_address.h>
 31 #include <linux/of_irq.h>
 32 #include <linux/of_platform.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/pci.h>
 35 
 36 #include <asm/io.h>
 37 
 38 #define LBICTRL_LPCCTL_NR               0x00004000
 39 #define CLE_PIN_CTL                     15
 40 #define ALE_PIN_CTL                     14
 41 
 42 static unsigned int lpcctl;
 43 static struct mtd_info *pasemi_nand_mtd;
 44 static const char driver_name[] = "pasemi-nand";
 45 
 46 static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 47 {
 48         struct nand_chip *chip = mtd_to_nand(mtd);
 49 
 50         while (len > 0x800) {
 51                 memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
 52                 buf += 0x800;
 53                 len -= 0x800;
 54         }
 55         memcpy_fromio(buf, chip->IO_ADDR_R, len);
 56 }
 57 
 58 static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 59 {
 60         struct nand_chip *chip = mtd_to_nand(mtd);
 61 
 62         while (len > 0x800) {
 63                 memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
 64                 buf += 0x800;
 65                 len -= 0x800;
 66         }
 67         memcpy_toio(chip->IO_ADDR_R, buf, len);
 68 }
 69 
 70 static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
 71                              unsigned int ctrl)
 72 {
 73         struct nand_chip *chip = mtd_to_nand(mtd);
 74 
 75         if (cmd == NAND_CMD_NONE)
 76                 return;
 77 
 78         if (ctrl & NAND_CLE)
 79                 out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
 80         else
 81                 out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
 82 
 83         /* Push out posted writes */
 84         eieio();
 85         inl(lpcctl);
 86 }
 87 
 88 int pasemi_device_ready(struct mtd_info *mtd)
 89 {
 90         return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
 91 }
 92 
 93 static int pasemi_nand_probe(struct platform_device *ofdev)
 94 {
 95         struct device *dev = &ofdev->dev;
 96         struct pci_dev *pdev;
 97         struct device_node *np = dev->of_node;
 98         struct resource res;
 99         struct nand_chip *chip;
100         int err = 0;
101 
102         err = of_address_to_resource(np, 0, &res);
103 
104         if (err)
105                 return -EINVAL;
106 
107         /* We only support one device at the moment */
108         if (pasemi_nand_mtd)
109                 return -ENODEV;
110 
111         dev_dbg(dev, "pasemi_nand at %pR\n", &res);
112 
113         /* Allocate memory for MTD device structure and private data */
114         chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
115         if (!chip) {
116                 err = -ENOMEM;
117                 goto out;
118         }
119 
120         pasemi_nand_mtd = nand_to_mtd(chip);
121 
122         /* Link the private data with the MTD structure */
123         pasemi_nand_mtd->dev.parent = dev;
124 
125         chip->IO_ADDR_R = of_iomap(np, 0);
126         chip->IO_ADDR_W = chip->IO_ADDR_R;
127 
128         if (!chip->IO_ADDR_R) {
129                 err = -EIO;
130                 goto out_mtd;
131         }
132 
133         pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
134         if (!pdev) {
135                 err = -ENODEV;
136                 goto out_ior;
137         }
138 
139         lpcctl = pci_resource_start(pdev, 0);
140         pci_dev_put(pdev);
141 
142         if (!request_region(lpcctl, 4, driver_name)) {
143                 err = -EBUSY;
144                 goto out_ior;
145         }
146 
147         chip->cmd_ctrl = pasemi_hwcontrol;
148         chip->dev_ready = pasemi_device_ready;
149         chip->read_buf = pasemi_read_buf;
150         chip->write_buf = pasemi_write_buf;
151         chip->chip_delay = 0;
152         chip->ecc.mode = NAND_ECC_SOFT;
153         chip->ecc.algo = NAND_ECC_HAMMING;
154 
155         /* Enable the following for a flash based bad block table */
156         chip->bbt_options = NAND_BBT_USE_FLASH;
157 
158         /* Scan to find existence of the device */
159         if (nand_scan(pasemi_nand_mtd, 1)) {
160                 err = -ENXIO;
161                 goto out_lpc;
162         }
163 
164         if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
165                 dev_err(dev, "Unable to register MTD device\n");
166                 err = -ENODEV;
167                 goto out_lpc;
168         }
169 
170         dev_info(dev, "PA Semi NAND flash at %pR, control at I/O %x\n", &res,
171                  lpcctl);
172 
173         return 0;
174 
175  out_lpc:
176         release_region(lpcctl, 4);
177  out_ior:
178         iounmap(chip->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 
189         if (!pasemi_nand_mtd)
190                 return 0;
191 
192         chip = mtd_to_nand(pasemi_nand_mtd);
193 
194         /* Release resources, unregister device */
195         nand_release(pasemi_nand_mtd);
196 
197         release_region(lpcctl, 4);
198 
199         iounmap(chip->IO_ADDR_R);
200 
201         /* Free the MTD device structure */
202         kfree(chip);
203 
204         pasemi_nand_mtd = NULL;
205 
206         return 0;
207 }
208 
209 static const struct of_device_id pasemi_nand_match[] =
210 {
211         {
212                 .compatible   = "pasemi,localbus-nand",
213         },
214         {},
215 };
216 
217 MODULE_DEVICE_TABLE(of, pasemi_nand_match);
218 
219 static struct platform_driver pasemi_nand_driver =
220 {
221         .driver = {
222                 .name = driver_name,
223                 .of_match_table = pasemi_nand_match,
224         },
225         .probe          = pasemi_nand_probe,
226         .remove         = pasemi_nand_remove,
227 };
228 
229 module_platform_driver(pasemi_nand_driver);
230 
231 MODULE_LICENSE("GPL");
232 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
233 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
234 

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