2 * drivers/mtd/nand/ams-delta.c
4 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
6 * Derived from drivers/mtd/toto.c
7 * Converted to platform driver by Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
8 * Partially stolen from drivers/mtd/nand/plat_nand.c
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 * This is a device driver for the NAND flash device found on the
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/partitions.h>
27 #include <mach/hardware.h>
28 #include <asm/sizes.h>
29 #include <linux/gpio.h>
30 #include <plat/board-ams-delta.h>
33 * MTD structure for E3 (Delta)
35 static struct mtd_info *ams_delta_mtd = NULL;
38 * Define partitions for flash devices
41 static struct mtd_partition partition_info[] = {
44 .size = 3 * SZ_1M + SZ_512K },
46 .offset = 3 * SZ_1M + SZ_512K,
48 { .name = "u-boot params",
49 .offset = 3 * SZ_1M + SZ_512K + SZ_256K,
51 { .name = "Amstrad LDR",
54 { .name = "File system",
55 .offset = 4 * SZ_1M + 1 * SZ_256K,
57 { .name = "PBL reserved",
58 .offset = 32 * SZ_1M - 3 * SZ_256K,
59 .size = 3 * SZ_256K },
62 static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
64 struct nand_chip *this = mtd->priv;
65 void __iomem *io_base = this->priv;
67 writew(0, io_base + OMAP_MPUIO_IO_CNTL);
68 writew(byte, this->IO_ADDR_W);
69 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 0);
71 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 1);
74 static u_char ams_delta_read_byte(struct mtd_info *mtd)
77 struct nand_chip *this = mtd->priv;
78 void __iomem *io_base = this->priv;
80 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 0);
82 writew(~0, io_base + OMAP_MPUIO_IO_CNTL);
83 res = readw(this->IO_ADDR_R);
84 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 1);
89 static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf,
95 ams_delta_write_byte(mtd, buf[i]);
98 static void ams_delta_read_buf(struct mtd_info *mtd, u_char *buf, int len)
102 for (i=0; i<len; i++)
103 buf[i] = ams_delta_read_byte(mtd);
107 * Command control function
110 * NAND_NCE: bit 0 -> bit 2
111 * NAND_CLE: bit 1 -> bit 7
112 * NAND_ALE: bit 2 -> bit 6
114 static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,
118 if (ctrl & NAND_CTRL_CHANGE) {
119 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NCE,
120 (ctrl & NAND_NCE) == 0);
121 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_CLE,
122 (ctrl & NAND_CLE) != 0);
123 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_ALE,
124 (ctrl & NAND_ALE) != 0);
127 if (cmd != NAND_CMD_NONE)
128 ams_delta_write_byte(mtd, cmd);
131 static int ams_delta_nand_ready(struct mtd_info *mtd)
133 return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB);
136 static const struct gpio _mandatory_gpio[] = {
138 .gpio = AMS_DELTA_GPIO_PIN_NAND_NCE,
139 .flags = GPIOF_OUT_INIT_HIGH,
143 .gpio = AMS_DELTA_GPIO_PIN_NAND_NRE,
144 .flags = GPIOF_OUT_INIT_HIGH,
148 .gpio = AMS_DELTA_GPIO_PIN_NAND_NWP,
149 .flags = GPIOF_OUT_INIT_HIGH,
153 .gpio = AMS_DELTA_GPIO_PIN_NAND_NWE,
154 .flags = GPIOF_OUT_INIT_HIGH,
158 .gpio = AMS_DELTA_GPIO_PIN_NAND_ALE,
159 .flags = GPIOF_OUT_INIT_LOW,
163 .gpio = AMS_DELTA_GPIO_PIN_NAND_CLE,
164 .flags = GPIOF_OUT_INIT_LOW,
170 * Main initialization routine
172 static int __devinit ams_delta_init(struct platform_device *pdev)
174 struct nand_chip *this;
175 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
176 void __iomem *io_base;
182 /* Allocate memory for MTD device structure and private data */
183 ams_delta_mtd = kmalloc(sizeof(struct mtd_info) +
184 sizeof(struct nand_chip), GFP_KERNEL);
185 if (!ams_delta_mtd) {
186 printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n");
191 ams_delta_mtd->owner = THIS_MODULE;
193 /* Get pointer to private data */
194 this = (struct nand_chip *) (&ams_delta_mtd[1]);
196 /* Initialize structures */
197 memset(ams_delta_mtd, 0, sizeof(struct mtd_info));
198 memset(this, 0, sizeof(struct nand_chip));
200 /* Link the private data with the MTD structure */
201 ams_delta_mtd->priv = this;
204 * Don't try to request the memory region from here,
205 * it should have been already requested from the
206 * gpio-omap driver and requesting it again would fail.
209 io_base = ioremap(res->start, resource_size(res));
210 if (io_base == NULL) {
211 dev_err(&pdev->dev, "ioremap failed\n");
216 this->priv = io_base;
218 /* Set address of NAND IO lines */
219 this->IO_ADDR_R = io_base + OMAP_MPUIO_INPUT_LATCH;
220 this->IO_ADDR_W = io_base + OMAP_MPUIO_OUTPUT;
221 this->read_byte = ams_delta_read_byte;
222 this->write_buf = ams_delta_write_buf;
223 this->read_buf = ams_delta_read_buf;
224 this->cmd_ctrl = ams_delta_hwcontrol;
225 if (gpio_request(AMS_DELTA_GPIO_PIN_NAND_RB, "nand_rdy") == 0) {
226 this->dev_ready = ams_delta_nand_ready;
228 this->dev_ready = NULL;
229 printk(KERN_NOTICE "Couldn't request gpio for Delta NAND ready.\n");
231 /* 25 us command delay time */
232 this->chip_delay = 30;
233 this->ecc.mode = NAND_ECC_SOFT;
235 platform_set_drvdata(pdev, io_base);
237 /* Set chip enabled, but */
238 err = gpio_request_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
242 /* Scan to find existence of the device */
243 if (nand_scan(ams_delta_mtd, 1)) {
248 /* Register the partitions */
249 mtd_device_register(ams_delta_mtd, partition_info,
250 ARRAY_SIZE(partition_info));
255 gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
257 platform_set_drvdata(pdev, NULL);
258 gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
261 kfree(ams_delta_mtd);
269 static int __devexit ams_delta_cleanup(struct platform_device *pdev)
271 void __iomem *io_base = platform_get_drvdata(pdev);
273 /* Release resources, unregister device */
274 nand_release(ams_delta_mtd);
276 gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
277 gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
280 /* Free the MTD device structure */
281 kfree(ams_delta_mtd);
286 static struct platform_driver ams_delta_nand_driver = {
287 .probe = ams_delta_init,
288 .remove = __devexit_p(ams_delta_cleanup),
290 .name = "ams-delta-nand",
291 .owner = THIS_MODULE,
295 module_platform_driver(ams_delta_nand_driver);
297 MODULE_LICENSE("GPL");
298 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
299 MODULE_DESCRIPTION("Glue layer for NAND flash on Amstrad E3 (Delta)");