source: src/linux/universal/linux-3.18/drivers/mtd/maps/pmcmsp-flash.c @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 3 months ago

update

File size: 6.0 KB
Line 
1/*
2 * Mapping of a custom board with both AMD CFI and JEDEC flash in partitions.
3 * Config with both CFI and JEDEC device support.
4 *
5 * Basically physmap.c with the addition of partitions and
6 * an array of mapping info to accommodate more than one flash type per board.
7 *
8 * Copyright 2005-2007 PMC-Sierra, Inc.
9 *
10 *  This program is free software; you can redistribute  it and/or modify it
11 *  under  the terms of  the GNU General  Public License as published by the
12 *  Free Software Foundation;  either version 2 of the  License, or (at your
13 *  option) any later version.
14 *
15 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
16 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
17 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
18 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
19 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
21 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
22 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
23 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 *  You should have received a copy of the  GNU General Public License along
27 *  with this program; if not, write  to the Free Software Foundation, Inc.,
28 *  675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
35#include <linux/mtd/mtd.h>
36#include <linux/mtd/map.h>
37#include <linux/mtd/partitions.h>
38
39#include <asm/io.h>
40
41#include <msp_prom.h>
42#include <msp_regs.h>
43
44
45static struct mtd_info **msp_flash;
46static struct mtd_partition **msp_parts;
47static struct map_info *msp_maps;
48static int fcnt;
49
50#define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
51
52static int __init init_msp_flash(void)
53{
54        int i, j, ret = -ENOMEM;
55        int offset, coff;
56        char *env;
57        int pcnt;
58        char flash_name[] = "flash0";
59        char part_name[] = "flash0_0";
60        unsigned addr, size;
61
62        /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
63        if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
64            (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
65                printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
66                return -ENXIO;
67        }
68
69        /* examine the prom environment for flash devices */
70        for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
71                flash_name[5] = '0' + fcnt + 1;
72
73        if (fcnt < 1)
74                return -ENXIO;
75
76        printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
77
78        msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
79        if (!msp_flash)
80                return -ENOMEM;
81
82        msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
83        if (!msp_parts)
84                goto free_msp_flash;
85
86        msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
87        if (!msp_maps)
88                goto free_msp_parts;
89
90        /* loop over the flash devices, initializing each */
91        for (i = 0; i < fcnt; i++) {
92                /* examine the prom environment for flash partititions */
93                part_name[5] = '0' + i;
94                part_name[7] = '0';
95                for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
96                        part_name[7] = '0' + pcnt + 1;
97
98                if (pcnt == 0) {
99                        printk(KERN_NOTICE "Skipping flash device %d "
100                                "(no partitions defined)\n", i);
101                        continue;
102                }
103
104                msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
105                                       GFP_KERNEL);
106                if (!msp_parts[i])
107                        goto cleanup_loop;
108
109                /* now initialize the devices proper */
110                flash_name[5] = '0' + i;
111                env = prom_getenv(flash_name);
112
113                if (sscanf(env, "%x:%x", &addr, &size) < 2) {
114                        ret = -ENXIO;
115                        kfree(msp_parts[i]);
116                        goto cleanup_loop;
117                }
118                addr = CPHYSADDR(addr);
119
120                printk(KERN_NOTICE
121                        "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
122                        flash_name, size, addr);
123                /* This must matchs the actual size of the flash chip */
124                msp_maps[i].size = size;
125                msp_maps[i].phys = addr;
126
127                /*
128                 * Platforms have a specific limit of the size of memory
129                 * which may be mapped for flash:
130                 */
131                if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
132                        size = CONFIG_MSP_FLASH_MAP_LIMIT;
133
134                msp_maps[i].virt = ioremap(addr, size);
135                if (msp_maps[i].virt == NULL) {
136                        ret = -ENXIO;
137                        kfree(msp_parts[i]);
138                        goto cleanup_loop;
139                }
140
141                msp_maps[i].bankwidth = 1;
142                msp_maps[i].name = kstrndup(flash_name, 7, GFP_KERNEL);
143                if (!msp_maps[i].name) {
144                        iounmap(msp_maps[i].virt);
145                        kfree(msp_parts[i]);
146                        goto cleanup_loop;
147                }
148
149                for (j = 0; j < pcnt; j++) {
150                        part_name[5] = '0' + i;
151                        part_name[7] = '0' + j;
152
153                        env = prom_getenv(part_name);
154
155                        if (sscanf(env, "%x:%x:%n", &offset, &size,
156                                                &coff) < 2) {
157                                ret = -ENXIO;
158                                kfree(msp_maps[i].name);
159                                iounmap(msp_maps[i].virt);
160                                kfree(msp_parts[i]);
161                                goto cleanup_loop;
162                        }
163
164                        msp_parts[i][j].size = size;
165                        msp_parts[i][j].offset = offset;
166                        msp_parts[i][j].name = env + coff;
167                }
168
169                /* now probe and add the device */
170                simple_map_init(&msp_maps[i]);
171                msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
172                if (msp_flash[i]) {
173                        msp_flash[i]->owner = THIS_MODULE;
174                        mtd_device_register(msp_flash[i], msp_parts[i], pcnt);
175                } else {
176                        printk(KERN_ERR "map probe failed for flash\n");
177                        ret = -ENXIO;
178                        kfree(msp_maps[i].name);
179                        iounmap(msp_maps[i].virt);
180                        kfree(msp_parts[i]);
181                        goto cleanup_loop;
182                }
183        }
184
185        return 0;
186
187cleanup_loop:
188        while (i--) {
189                mtd_device_unregister(msp_flash[i]);
190                map_destroy(msp_flash[i]);
191                kfree(msp_maps[i].name);
192                iounmap(msp_maps[i].virt);
193                kfree(msp_parts[i]);
194        }
195        kfree(msp_maps);
196free_msp_parts:
197        kfree(msp_parts);
198free_msp_flash:
199        kfree(msp_flash);
200        return ret;
201}
202
203static void __exit cleanup_msp_flash(void)
204{
205        int i;
206
207        for (i = 0; i < fcnt; i++) {
208                mtd_device_unregister(msp_flash[i]);
209                map_destroy(msp_flash[i]);
210                iounmap((void *)msp_maps[i].virt);
211
212                /* free the memory */
213                kfree(msp_maps[i].name);
214                kfree(msp_parts[i]);
215        }
216
217        kfree(msp_flash);
218        kfree(msp_parts);
219        kfree(msp_maps);
220}
221
222MODULE_AUTHOR("PMC-Sierra, Inc");
223MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
224MODULE_LICENSE("GPL");
225
226module_init(init_msp_flash);
227module_exit(cleanup_msp_flash);
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