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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->priv;
 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->priv;
 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->priv;
 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 pci_dev *pdev;
 96         struct device_node *np = ofdev->dev.of_node;
 97         struct resource res;
 98         struct nand_chip *chip;
 99         int err = 0;
100 
101         err = of_address_to_resource(np, 0, &res);
102 
103         if (err)
104                 return -EINVAL;
105 
106         /* We only support one device at the moment */
107         if (pasemi_nand_mtd)
108                 return -ENODEV;
109 
110         pr_debug("pasemi_nand at %pR\n", &res);
111 
112         /* Allocate memory for MTD device structure and private data */
113         pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
114                                   sizeof(struct nand_chip), GFP_KERNEL);
115         if (!pasemi_nand_mtd) {
116                 printk(KERN_WARNING
117                        "Unable to allocate PASEMI NAND MTD device structure\n");
118                 err = -ENOMEM;
119                 goto out;
120         }
121 
122         /* Get pointer to private data */
123         chip = (struct nand_chip *)&pasemi_nand_mtd[1];
124 
125         /* Link the private data with the MTD structure */
126         pasemi_nand_mtd->priv = chip;
127         pasemi_nand_mtd->owner = THIS_MODULE;
128 
129         chip->IO_ADDR_R = of_iomap(np, 0);
130         chip->IO_ADDR_W = chip->IO_ADDR_R;
131 
132         if (!chip->IO_ADDR_R) {
133                 err = -EIO;
134                 goto out_mtd;
135         }
136 
137         pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
138         if (!pdev) {
139                 err = -ENODEV;
140                 goto out_ior;
141         }
142 
143         lpcctl = pci_resource_start(pdev, 0);
144         pci_dev_put(pdev);
145 
146         if (!request_region(lpcctl, 4, driver_name)) {
147                 err = -EBUSY;
148                 goto out_ior;
149         }
150 
151         chip->cmd_ctrl = pasemi_hwcontrol;
152         chip->dev_ready = pasemi_device_ready;
153         chip->read_buf = pasemi_read_buf;
154         chip->write_buf = pasemi_write_buf;
155         chip->chip_delay = 0;
156         chip->ecc.mode = NAND_ECC_SOFT;
157 
158         /* Enable the following for a flash based bad block table */
159         chip->bbt_options = NAND_BBT_USE_FLASH;
160 
161         /* Scan to find existence of the device */
162         if (nand_scan(pasemi_nand_mtd, 1)) {
163                 err = -ENXIO;
164                 goto out_lpc;
165         }
166 
167         if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
168                 printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
169                 err = -ENODEV;
170                 goto out_lpc;
171         }
172 
173         printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
174                res.start, lpcctl);
175 
176         return 0;
177 
178  out_lpc:
179         release_region(lpcctl, 4);
180  out_ior:
181         iounmap(chip->IO_ADDR_R);
182  out_mtd:
183         kfree(pasemi_nand_mtd);
184  out:
185         return err;
186 }
187 
188 static int pasemi_nand_remove(struct platform_device *ofdev)
189 {
190         struct nand_chip *chip;
191 
192         if (!pasemi_nand_mtd)
193                 return 0;
194 
195         chip = pasemi_nand_mtd->priv;
196 
197         /* Release resources, unregister device */
198         nand_release(pasemi_nand_mtd);
199 
200         release_region(lpcctl, 4);
201 
202         iounmap(chip->IO_ADDR_R);
203 
204         /* Free the MTD device structure */
205         kfree(pasemi_nand_mtd);
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                 .owner = THIS_MODULE,
227                 .of_match_table = pasemi_nand_match,
228         },
229         .probe          = pasemi_nand_probe,
230         .remove         = pasemi_nand_remove,
231 };
232 
233 module_platform_driver(pasemi_nand_driver);
234 
235 MODULE_LICENSE("GPL");
236 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
237 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
238 

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