Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / mtd / nand / ams-delta.c
blobd60ada45c549450758a1079d097b81f56271580d
1 /*
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.
14 * Overview:
15 * This is a device driver for the NAND flash device found on the
16 * Amstrad E3 (Delta).
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/delay.h>
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/rawnand.h>
24 #include <linux/mtd/partitions.h>
25 #include <linux/gpio.h>
26 #include <linux/platform_data/gpio-omap.h>
28 #include <asm/io.h>
29 #include <asm/sizes.h>
31 #include <mach/board-ams-delta.h>
33 #include <mach/hardware.h>
36 * MTD structure for E3 (Delta)
38 static struct mtd_info *ams_delta_mtd = NULL;
41 * Define partitions for flash devices
44 static const struct mtd_partition partition_info[] = {
45 { .name = "Kernel",
46 .offset = 0,
47 .size = 3 * SZ_1M + SZ_512K },
48 { .name = "u-boot",
49 .offset = 3 * SZ_1M + SZ_512K,
50 .size = SZ_256K },
51 { .name = "u-boot params",
52 .offset = 3 * SZ_1M + SZ_512K + SZ_256K,
53 .size = SZ_256K },
54 { .name = "Amstrad LDR",
55 .offset = 4 * SZ_1M,
56 .size = SZ_256K },
57 { .name = "File system",
58 .offset = 4 * SZ_1M + 1 * SZ_256K,
59 .size = 27 * SZ_1M },
60 { .name = "PBL reserved",
61 .offset = 32 * SZ_1M - 3 * SZ_256K,
62 .size = 3 * SZ_256K },
65 static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
67 struct nand_chip *this = mtd_to_nand(mtd);
68 void __iomem *io_base = (void __iomem *)nand_get_controller_data(this);
70 writew(0, io_base + OMAP_MPUIO_IO_CNTL);
71 writew(byte, this->IO_ADDR_W);
72 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 0);
73 ndelay(40);
74 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 1);
77 static u_char ams_delta_read_byte(struct mtd_info *mtd)
79 u_char res;
80 struct nand_chip *this = mtd_to_nand(mtd);
81 void __iomem *io_base = (void __iomem *)nand_get_controller_data(this);
83 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 0);
84 ndelay(40);
85 writew(~0, io_base + OMAP_MPUIO_IO_CNTL);
86 res = readw(this->IO_ADDR_R);
87 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 1);
89 return res;
92 static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf,
93 int len)
95 int i;
97 for (i=0; i<len; i++)
98 ams_delta_write_byte(mtd, buf[i]);
101 static void ams_delta_read_buf(struct mtd_info *mtd, u_char *buf, int len)
103 int i;
105 for (i=0; i<len; i++)
106 buf[i] = ams_delta_read_byte(mtd);
110 * Command control function
112 * ctrl:
113 * NAND_NCE: bit 0 -> bit 2
114 * NAND_CLE: bit 1 -> bit 7
115 * NAND_ALE: bit 2 -> bit 6
117 static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,
118 unsigned int ctrl)
121 if (ctrl & NAND_CTRL_CHANGE) {
122 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NCE,
123 (ctrl & NAND_NCE) == 0);
124 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_CLE,
125 (ctrl & NAND_CLE) != 0);
126 gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_ALE,
127 (ctrl & NAND_ALE) != 0);
130 if (cmd != NAND_CMD_NONE)
131 ams_delta_write_byte(mtd, cmd);
134 static int ams_delta_nand_ready(struct mtd_info *mtd)
136 return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB);
139 static const struct gpio _mandatory_gpio[] = {
141 .gpio = AMS_DELTA_GPIO_PIN_NAND_NCE,
142 .flags = GPIOF_OUT_INIT_HIGH,
143 .label = "nand_nce",
146 .gpio = AMS_DELTA_GPIO_PIN_NAND_NRE,
147 .flags = GPIOF_OUT_INIT_HIGH,
148 .label = "nand_nre",
151 .gpio = AMS_DELTA_GPIO_PIN_NAND_NWP,
152 .flags = GPIOF_OUT_INIT_HIGH,
153 .label = "nand_nwp",
156 .gpio = AMS_DELTA_GPIO_PIN_NAND_NWE,
157 .flags = GPIOF_OUT_INIT_HIGH,
158 .label = "nand_nwe",
161 .gpio = AMS_DELTA_GPIO_PIN_NAND_ALE,
162 .flags = GPIOF_OUT_INIT_LOW,
163 .label = "nand_ale",
166 .gpio = AMS_DELTA_GPIO_PIN_NAND_CLE,
167 .flags = GPIOF_OUT_INIT_LOW,
168 .label = "nand_cle",
173 * Main initialization routine
175 static int ams_delta_init(struct platform_device *pdev)
177 struct nand_chip *this;
178 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
179 void __iomem *io_base;
180 int err = 0;
182 if (!res)
183 return -ENXIO;
185 /* Allocate memory for MTD device structure and private data */
186 this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
187 if (!this) {
188 printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n");
189 err = -ENOMEM;
190 goto out;
193 ams_delta_mtd = nand_to_mtd(this);
194 ams_delta_mtd->owner = THIS_MODULE;
197 * Don't try to request the memory region from here,
198 * it should have been already requested from the
199 * gpio-omap driver and requesting it again would fail.
202 io_base = ioremap(res->start, resource_size(res));
203 if (io_base == NULL) {
204 dev_err(&pdev->dev, "ioremap failed\n");
205 err = -EIO;
206 goto out_free;
209 nand_set_controller_data(this, (void *)io_base);
211 /* Set address of NAND IO lines */
212 this->IO_ADDR_R = io_base + OMAP_MPUIO_INPUT_LATCH;
213 this->IO_ADDR_W = io_base + OMAP_MPUIO_OUTPUT;
214 this->read_byte = ams_delta_read_byte;
215 this->write_buf = ams_delta_write_buf;
216 this->read_buf = ams_delta_read_buf;
217 this->cmd_ctrl = ams_delta_hwcontrol;
218 if (gpio_request(AMS_DELTA_GPIO_PIN_NAND_RB, "nand_rdy") == 0) {
219 this->dev_ready = ams_delta_nand_ready;
220 } else {
221 this->dev_ready = NULL;
222 printk(KERN_NOTICE "Couldn't request gpio for Delta NAND ready.\n");
224 /* 25 us command delay time */
225 this->chip_delay = 30;
226 this->ecc.mode = NAND_ECC_SOFT;
227 this->ecc.algo = NAND_ECC_HAMMING;
229 platform_set_drvdata(pdev, io_base);
231 /* Set chip enabled, but */
232 err = gpio_request_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
233 if (err)
234 goto out_gpio;
236 /* Scan to find existence of the device */
237 err = nand_scan(ams_delta_mtd, 1);
238 if (err)
239 goto out_mtd;
241 /* Register the partitions */
242 mtd_device_register(ams_delta_mtd, partition_info,
243 ARRAY_SIZE(partition_info));
245 goto out;
247 out_mtd:
248 gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
249 out_gpio:
250 gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
251 iounmap(io_base);
252 out_free:
253 kfree(this);
254 out:
255 return err;
259 * Clean up routine
261 static int ams_delta_cleanup(struct platform_device *pdev)
263 void __iomem *io_base = platform_get_drvdata(pdev);
265 /* Release resources, unregister device */
266 nand_release(ams_delta_mtd);
268 gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
269 gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
270 iounmap(io_base);
272 /* Free the MTD device structure */
273 kfree(mtd_to_nand(ams_delta_mtd));
275 return 0;
278 static struct platform_driver ams_delta_nand_driver = {
279 .probe = ams_delta_init,
280 .remove = ams_delta_cleanup,
281 .driver = {
282 .name = "ams-delta-nand",
286 module_platform_driver(ams_delta_nand_driver);
288 MODULE_LICENSE("GPL");
289 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
290 MODULE_DESCRIPTION("Glue layer for NAND flash on Amstrad E3 (Delta)");