David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 1 | /* |
| 2 | * at25.c -- support most SPI EEPROMs, such as Atmel AT25 models |
| 3 | * |
| 4 | * Copyright (C) 2006 David Brownell |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/sched.h> |
| 18 | |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 19 | #include <linux/nvmem-provider.h> |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 20 | #include <linux/spi/spi.h> |
| 21 | #include <linux/spi/eeprom.h> |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 22 | #include <linux/property.h> |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 23 | |
David Brownell | 3f86f14 | 2007-12-04 23:45:10 -0800 | [diff] [blame] | 24 | /* |
| 25 | * NOTE: this is an *EEPROM* driver. The vagaries of product naming |
| 26 | * mean that some AT25 products are EEPROMs, and others are FLASH. |
| 27 | * Handle FLASH chips with the drivers/mtd/devices/m25p80.c driver, |
| 28 | * not this one! |
| 29 | */ |
| 30 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 31 | struct at25_data { |
| 32 | struct spi_device *spi; |
| 33 | struct mutex lock; |
| 34 | struct spi_eeprom chip; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 35 | unsigned addrlen; |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 36 | struct nvmem_config nvmem_config; |
| 37 | struct nvmem_device *nvmem; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | #define AT25_WREN 0x06 /* latch the write enable */ |
| 41 | #define AT25_WRDI 0x04 /* reset the write enable */ |
| 42 | #define AT25_RDSR 0x05 /* read status register */ |
| 43 | #define AT25_WRSR 0x01 /* write status register */ |
| 44 | #define AT25_READ 0x03 /* read byte(s) */ |
| 45 | #define AT25_WRITE 0x02 /* write byte(s)/sector */ |
| 46 | |
| 47 | #define AT25_SR_nRDY 0x01 /* nRDY = write-in-progress */ |
| 48 | #define AT25_SR_WEN 0x02 /* write enable (latched) */ |
| 49 | #define AT25_SR_BP0 0x04 /* BP for software writeprotect */ |
| 50 | #define AT25_SR_BP1 0x08 |
| 51 | #define AT25_SR_WPEN 0x80 /* writeprotect enable */ |
| 52 | |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 53 | #define AT25_INSTR_BIT3 0x08 /* Additional address bit in instr */ |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 54 | |
| 55 | #define EE_MAXADDRLEN 3 /* 24 bit addresses, up to 2 MBytes */ |
| 56 | |
| 57 | /* Specs often allow 5 msec for a page write, sometimes 20 msec; |
| 58 | * it's important to recover from write timeouts. |
| 59 | */ |
| 60 | #define EE_TIMEOUT 25 |
| 61 | |
| 62 | /*-------------------------------------------------------------------------*/ |
| 63 | |
| 64 | #define io_limit PAGE_SIZE /* bytes */ |
| 65 | |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 66 | static int at25_ee_read(void *priv, unsigned int offset, |
| 67 | void *val, size_t count) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 68 | { |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 69 | struct at25_data *at25 = priv; |
| 70 | char *buf = val; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 71 | u8 command[EE_MAXADDRLEN + 1]; |
| 72 | u8 *cp; |
| 73 | ssize_t status; |
| 74 | struct spi_transfer t[2]; |
| 75 | struct spi_message m; |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 76 | u8 instr; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 77 | |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 78 | if (unlikely(offset >= at25->chip.byte_len)) |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 79 | return -EINVAL; |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 80 | if ((offset + count) > at25->chip.byte_len) |
| 81 | count = at25->chip.byte_len - offset; |
David Brownell | 14dd1ff | 2009-04-02 16:56:58 -0700 | [diff] [blame] | 82 | if (unlikely(!count)) |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 83 | return -EINVAL; |
David Brownell | 14dd1ff | 2009-04-02 16:56:58 -0700 | [diff] [blame] | 84 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 85 | cp = command; |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 86 | |
| 87 | instr = AT25_READ; |
| 88 | if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) |
| 89 | if (offset >= (1U << (at25->addrlen * 8))) |
| 90 | instr |= AT25_INSTR_BIT3; |
| 91 | *cp++ = instr; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 92 | |
| 93 | /* 8/16/24-bit address is written MSB first */ |
| 94 | switch (at25->addrlen) { |
| 95 | default: /* case 3 */ |
| 96 | *cp++ = offset >> 16; |
| 97 | case 2: |
| 98 | *cp++ = offset >> 8; |
| 99 | case 1: |
| 100 | case 0: /* can't happen: for better codegen */ |
| 101 | *cp++ = offset >> 0; |
| 102 | } |
| 103 | |
| 104 | spi_message_init(&m); |
| 105 | memset(t, 0, sizeof t); |
| 106 | |
| 107 | t[0].tx_buf = command; |
| 108 | t[0].len = at25->addrlen + 1; |
| 109 | spi_message_add_tail(&t[0], &m); |
| 110 | |
| 111 | t[1].rx_buf = buf; |
| 112 | t[1].len = count; |
| 113 | spi_message_add_tail(&t[1], &m); |
| 114 | |
| 115 | mutex_lock(&at25->lock); |
| 116 | |
| 117 | /* Read it all at once. |
| 118 | * |
| 119 | * REVISIT that's potentially a problem with large chips, if |
| 120 | * other devices on the bus need to be accessed regularly or |
| 121 | * this chip is clocked very slowly |
| 122 | */ |
| 123 | status = spi_sync(at25->spi, &m); |
| 124 | dev_dbg(&at25->spi->dev, |
| 125 | "read %Zd bytes at %d --> %d\n", |
| 126 | count, offset, (int) status); |
| 127 | |
| 128 | mutex_unlock(&at25->lock); |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 129 | return status; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 130 | } |
| 131 | |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 132 | static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 133 | { |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 134 | struct at25_data *at25 = priv; |
| 135 | const char *buf = val; |
| 136 | int status = 0; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 137 | unsigned buf_size; |
| 138 | u8 *bounce; |
| 139 | |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 140 | if (unlikely(off >= at25->chip.byte_len)) |
David Brownell | 14dd1ff | 2009-04-02 16:56:58 -0700 | [diff] [blame] | 141 | return -EFBIG; |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 142 | if ((off + count) > at25->chip.byte_len) |
| 143 | count = at25->chip.byte_len - off; |
David Brownell | 14dd1ff | 2009-04-02 16:56:58 -0700 | [diff] [blame] | 144 | if (unlikely(!count)) |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 145 | return -EINVAL; |
David Brownell | 14dd1ff | 2009-04-02 16:56:58 -0700 | [diff] [blame] | 146 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 147 | /* Temp buffer starts with command and address */ |
| 148 | buf_size = at25->chip.page_size; |
| 149 | if (buf_size > io_limit) |
| 150 | buf_size = io_limit; |
| 151 | bounce = kmalloc(buf_size + at25->addrlen + 1, GFP_KERNEL); |
| 152 | if (!bounce) |
| 153 | return -ENOMEM; |
| 154 | |
| 155 | /* For write, rollover is within the page ... so we write at |
| 156 | * most one page, then manually roll over to the next page. |
| 157 | */ |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 158 | mutex_lock(&at25->lock); |
| 159 | do { |
| 160 | unsigned long timeout, retries; |
| 161 | unsigned segment; |
| 162 | unsigned offset = (unsigned) off; |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 163 | u8 *cp = bounce; |
Sebastian Heutling | f0d8367 | 2009-07-29 15:04:05 -0700 | [diff] [blame] | 164 | int sr; |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 165 | u8 instr; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 166 | |
| 167 | *cp = AT25_WREN; |
| 168 | status = spi_write(at25->spi, cp, 1); |
| 169 | if (status < 0) { |
| 170 | dev_dbg(&at25->spi->dev, "WREN --> %d\n", |
| 171 | (int) status); |
| 172 | break; |
| 173 | } |
| 174 | |
Ivo Sieben | b4161f0 | 2012-04-18 08:29:34 +0200 | [diff] [blame] | 175 | instr = AT25_WRITE; |
| 176 | if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) |
| 177 | if (offset >= (1U << (at25->addrlen * 8))) |
| 178 | instr |= AT25_INSTR_BIT3; |
| 179 | *cp++ = instr; |
| 180 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 181 | /* 8/16/24-bit address is written MSB first */ |
| 182 | switch (at25->addrlen) { |
| 183 | default: /* case 3 */ |
| 184 | *cp++ = offset >> 16; |
| 185 | case 2: |
| 186 | *cp++ = offset >> 8; |
| 187 | case 1: |
| 188 | case 0: /* can't happen: for better codegen */ |
| 189 | *cp++ = offset >> 0; |
| 190 | } |
| 191 | |
| 192 | /* Write as much of a page as we can */ |
| 193 | segment = buf_size - (offset % buf_size); |
| 194 | if (segment > count) |
| 195 | segment = count; |
| 196 | memcpy(cp, buf, segment); |
| 197 | status = spi_write(at25->spi, bounce, |
| 198 | segment + at25->addrlen + 1); |
| 199 | dev_dbg(&at25->spi->dev, |
| 200 | "write %u bytes at %u --> %d\n", |
| 201 | segment, offset, (int) status); |
| 202 | if (status < 0) |
| 203 | break; |
| 204 | |
| 205 | /* REVISIT this should detect (or prevent) failed writes |
| 206 | * to readonly sections of the EEPROM... |
| 207 | */ |
| 208 | |
| 209 | /* Wait for non-busy status */ |
| 210 | timeout = jiffies + msecs_to_jiffies(EE_TIMEOUT); |
| 211 | retries = 0; |
| 212 | do { |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 213 | |
| 214 | sr = spi_w8r8(at25->spi, AT25_RDSR); |
| 215 | if (sr < 0 || (sr & AT25_SR_nRDY)) { |
| 216 | dev_dbg(&at25->spi->dev, |
| 217 | "rdsr --> %d (%02x)\n", sr, sr); |
| 218 | /* at HZ=100, this is sloooow */ |
| 219 | msleep(1); |
| 220 | continue; |
| 221 | } |
| 222 | if (!(sr & AT25_SR_nRDY)) |
| 223 | break; |
| 224 | } while (retries++ < 3 || time_before_eq(jiffies, timeout)); |
| 225 | |
Sebastian Heutling | f0d8367 | 2009-07-29 15:04:05 -0700 | [diff] [blame] | 226 | if ((sr < 0) || (sr & AT25_SR_nRDY)) { |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 227 | dev_err(&at25->spi->dev, |
| 228 | "write %d bytes offset %d, " |
| 229 | "timeout after %u msecs\n", |
| 230 | segment, offset, |
| 231 | jiffies_to_msecs(jiffies - |
| 232 | (timeout - EE_TIMEOUT))); |
| 233 | status = -ETIMEDOUT; |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | off += segment; |
| 238 | buf += segment; |
| 239 | count -= segment; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 240 | |
| 241 | } while (count > 0); |
| 242 | |
| 243 | mutex_unlock(&at25->lock); |
| 244 | |
| 245 | kfree(bounce); |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 246 | return status; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 247 | } |
| 248 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 249 | /*-------------------------------------------------------------------------*/ |
| 250 | |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 251 | static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip) |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 252 | { |
| 253 | u32 val; |
| 254 | |
| 255 | memset(chip, 0, sizeof(*chip)); |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 256 | strncpy(chip->name, "at25", sizeof(chip->name)); |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 257 | |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 258 | if (device_property_read_u32(dev, "size", &val) == 0 || |
| 259 | device_property_read_u32(dev, "at25,byte-len", &val) == 0) { |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 260 | chip->byte_len = val; |
| 261 | } else { |
| 262 | dev_err(dev, "Error: missing \"size\" property\n"); |
| 263 | return -ENODEV; |
| 264 | } |
| 265 | |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 266 | if (device_property_read_u32(dev, "pagesize", &val) == 0 || |
| 267 | device_property_read_u32(dev, "at25,page-size", &val) == 0) { |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 268 | chip->page_size = (u16)val; |
| 269 | } else { |
| 270 | dev_err(dev, "Error: missing \"pagesize\" property\n"); |
| 271 | return -ENODEV; |
| 272 | } |
| 273 | |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 274 | if (device_property_read_u32(dev, "at25,addr-mode", &val) == 0) { |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 275 | chip->flags = (u16)val; |
| 276 | } else { |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 277 | if (device_property_read_u32(dev, "address-width", &val)) { |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 278 | dev_err(dev, |
| 279 | "Error: missing \"address-width\" property\n"); |
| 280 | return -ENODEV; |
| 281 | } |
| 282 | switch (val) { |
| 283 | case 8: |
| 284 | chip->flags |= EE_ADDR1; |
| 285 | break; |
| 286 | case 16: |
| 287 | chip->flags |= EE_ADDR2; |
| 288 | break; |
| 289 | case 24: |
| 290 | chip->flags |= EE_ADDR3; |
| 291 | break; |
| 292 | default: |
| 293 | dev_err(dev, |
| 294 | "Error: bad \"address-width\" property: %u\n", |
| 295 | val); |
| 296 | return -ENODEV; |
| 297 | } |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 298 | if (device_property_present(dev, "read-only")) |
David Daney | d6ae0d5 | 2012-08-22 12:03:57 -0700 | [diff] [blame] | 299 | chip->flags |= EE_READONLY; |
| 300 | } |
| 301 | return 0; |
| 302 | } |
| 303 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 304 | static int at25_probe(struct spi_device *spi) |
| 305 | { |
| 306 | struct at25_data *at25 = NULL; |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 307 | struct spi_eeprom chip; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 308 | int err; |
| 309 | int sr; |
| 310 | int addrlen; |
| 311 | |
| 312 | /* Chip description */ |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 313 | if (!spi->dev.platform_data) { |
Mika Westerberg | f60e7074 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 314 | err = at25_fw_to_chip(&spi->dev, &chip); |
| 315 | if (err) |
| 316 | return err; |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 317 | } else |
| 318 | chip = *(struct spi_eeprom *)spi->dev.platform_data; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 319 | |
| 320 | /* For now we only support 8/16/24 bit addressing */ |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 321 | if (chip.flags & EE_ADDR1) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 322 | addrlen = 1; |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 323 | else if (chip.flags & EE_ADDR2) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 324 | addrlen = 2; |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 325 | else if (chip.flags & EE_ADDR3) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 326 | addrlen = 3; |
| 327 | else { |
| 328 | dev_dbg(&spi->dev, "unsupported address type\n"); |
Nikolay Balandin | 01fe7b43 | 2013-05-28 13:01:21 -0700 | [diff] [blame] | 329 | return -EINVAL; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | /* Ping the chip ... the status register is pretty portable, |
| 333 | * unlike probing manufacturer IDs. We do expect that system |
| 334 | * firmware didn't write it in the past few milliseconds! |
| 335 | */ |
| 336 | sr = spi_w8r8(spi, AT25_RDSR); |
| 337 | if (sr < 0 || sr & AT25_SR_nRDY) { |
Atsushi Nemoto | c6ca97d | 2007-03-16 13:38:20 -0800 | [diff] [blame] | 338 | dev_dbg(&spi->dev, "rdsr --> %d (%02x)\n", sr, sr); |
Nikolay Balandin | 01fe7b43 | 2013-05-28 13:01:21 -0700 | [diff] [blame] | 339 | return -ENXIO; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 340 | } |
| 341 | |
Nikolay Balandin | 01fe7b43 | 2013-05-28 13:01:21 -0700 | [diff] [blame] | 342 | at25 = devm_kzalloc(&spi->dev, sizeof(struct at25_data), GFP_KERNEL); |
| 343 | if (!at25) |
| 344 | return -ENOMEM; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 345 | |
| 346 | mutex_init(&at25->lock); |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 347 | at25->chip = chip; |
Mark Brown | 96b2a45 | 2016-04-20 10:16:35 +0100 | [diff] [blame] | 348 | at25->spi = spi; |
Jingoo Han | 41ddcf6 | 2013-04-05 10:55:35 +0900 | [diff] [blame] | 349 | spi_set_drvdata(spi, at25); |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 350 | at25->addrlen = addrlen; |
| 351 | |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 352 | at25->nvmem_config.name = dev_name(&spi->dev); |
| 353 | at25->nvmem_config.dev = &spi->dev; |
| 354 | at25->nvmem_config.read_only = chip.flags & EE_READONLY; |
| 355 | at25->nvmem_config.root_only = true; |
| 356 | at25->nvmem_config.owner = THIS_MODULE; |
| 357 | at25->nvmem_config.compat = true; |
| 358 | at25->nvmem_config.base_dev = &spi->dev; |
Srinivas Kandagatla | 01973a0 | 2016-04-24 20:28:07 +0100 | [diff] [blame] | 359 | at25->nvmem_config.reg_read = at25_ee_read; |
| 360 | at25->nvmem_config.reg_write = at25_ee_write; |
| 361 | at25->nvmem_config.priv = at25; |
| 362 | at25->nvmem_config.stride = 4; |
| 363 | at25->nvmem_config.word_size = 1; |
| 364 | at25->nvmem_config.size = chip.byte_len; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 365 | |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 366 | at25->nvmem = nvmem_register(&at25->nvmem_config); |
| 367 | if (IS_ERR(at25->nvmem)) |
| 368 | return PTR_ERR(at25->nvmem); |
| 369 | |
| 370 | dev_info(&spi->dev, "%d %s %s eeprom%s, pagesize %u\n", |
| 371 | (chip.byte_len < 1024) |
| 372 | ? chip.byte_len |
| 373 | : (chip.byte_len / 1024), |
| 374 | (chip.byte_len < 1024) ? "Byte" : "KByte", |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 375 | at25->chip.name, |
Alexandre Pereira da Silva | 002176d | 2012-06-14 09:59:23 -0300 | [diff] [blame] | 376 | (chip.flags & EE_READONLY) ? " (readonly)" : "", |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 377 | at25->chip.page_size); |
| 378 | return 0; |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 379 | } |
| 380 | |
Bill Pemberton | 486a5c2 | 2012-11-19 13:26:02 -0500 | [diff] [blame] | 381 | static int at25_remove(struct spi_device *spi) |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 382 | { |
| 383 | struct at25_data *at25; |
| 384 | |
Jingoo Han | 41ddcf6 | 2013-04-05 10:55:35 +0900 | [diff] [blame] | 385 | at25 = spi_get_drvdata(spi); |
Andrew Lunn | 5a99f57 | 2016-02-26 20:59:22 +0100 | [diff] [blame] | 386 | nvmem_unregister(at25->nvmem); |
| 387 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | /*-------------------------------------------------------------------------*/ |
| 392 | |
Jan Luebbe | fbfdb6e | 2013-10-14 17:14:59 +0200 | [diff] [blame] | 393 | static const struct of_device_id at25_of_match[] = { |
| 394 | { .compatible = "atmel,at25", }, |
| 395 | { } |
| 396 | }; |
| 397 | MODULE_DEVICE_TABLE(of, at25_of_match); |
| 398 | |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 399 | static struct spi_driver at25_driver = { |
| 400 | .driver = { |
| 401 | .name = "at25", |
Jan Luebbe | fbfdb6e | 2013-10-14 17:14:59 +0200 | [diff] [blame] | 402 | .of_match_table = at25_of_match, |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 403 | }, |
| 404 | .probe = at25_probe, |
Bill Pemberton | 2d6bed9 | 2012-11-19 13:21:23 -0500 | [diff] [blame] | 405 | .remove = at25_remove, |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 406 | }; |
| 407 | |
Axel Lin | a3dc3c9 | 2012-01-22 15:38:22 +0800 | [diff] [blame] | 408 | module_spi_driver(at25_driver); |
David Brownell | b587b13 | 2007-02-12 00:52:48 -0800 | [diff] [blame] | 409 | |
| 410 | MODULE_DESCRIPTION("Driver for most SPI EEPROMs"); |
| 411 | MODULE_AUTHOR("David Brownell"); |
| 412 | MODULE_LICENSE("GPL"); |
Anton Vorontsov | e0626e3 | 2009-09-22 16:46:08 -0700 | [diff] [blame] | 413 | MODULE_ALIAS("spi:at25"); |