projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e7ec2e32 MB |
1 | /* |
| 2 | * Sonics Silicon Backplane | |
| 3 | * Common SPROM support routines | |
| 4 | * | |
| 5 | * Copyright (C) 2005-2008 Michael Buesch <[email protected]> | |
| 6 | * Copyright (C) 2005 Martin Langer <[email protected]> | |
| 7 | * Copyright (C) 2005 Stefano Brivio <[email protected]> | |
| 8 | * Copyright (C) 2005 Danny van Dyk <[email protected]> | |
| 9 | * Copyright (C) 2005 Andreas Jaggi <[email protected]> | |
| 10 | * | |
| 11 | * Licensed under the GNU/GPL. See COPYING for details. | |
| 12 | */ | |
| 13 | ||
| 14 | #include "ssb_private.h" | |
| 15 | ||
| 16 | ||
| 17 | static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len, | |
| 18 | size_t sprom_size_words) | |
| 19 | { | |
| 20 | int i, pos = 0; | |
| 21 | ||
| 22 | for (i = 0; i < sprom_size_words; i++) | |
| 23 | pos += snprintf(buf + pos, buf_len - pos - 1, | |
| 24 | "%04X", swab16(sprom[i]) & 0xFFFF); | |
| 25 | pos += snprintf(buf + pos, buf_len - pos - 1, "\n"); | |
| 26 | ||
| 27 | return pos + 1; | |
| 28 | } | |
| 29 | ||
| 30 | static int hex2sprom(u16 *sprom, const char *dump, size_t len, | |
| 31 | size_t sprom_size_words) | |
| 32 | { | |
| 33 | char tmp[5] = { 0 }; | |
| 34 | int cnt = 0; | |
| 35 | unsigned long parsed; | |
| 36 | ||
| 37 | if (len < sprom_size_words * 2) | |
| 38 | return -EINVAL; | |
| 39 | ||
| 40 | while (cnt < sprom_size_words) { | |
| 41 | memcpy(tmp, dump, 4); | |
| 42 | dump += 4; | |
| 43 | parsed = simple_strtoul(tmp, NULL, 16); | |
| 44 | sprom[cnt++] = swab16((u16)parsed); | |
| 45 | } | |
| 46 | ||
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | /* Common sprom device-attribute show-handler */ | |
| 51 | ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf, | |
| 52 | int (*sprom_read)(struct ssb_bus *bus, u16 *sprom)) | |
| 53 | { | |
| 54 | u16 *sprom; | |
| 55 | int err = -ENOMEM; | |
| 56 | ssize_t count = 0; | |
| 57 | size_t sprom_size_words = bus->sprom_size; | |
| 58 | ||
| 59 | sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL); | |
| 60 | if (!sprom) | |
| 61 | goto out; | |
| 62 | ||
| 63 | /* Use interruptible locking, as the SPROM write might | |
| 64 | * be holding the lock for several seconds. So allow userspace | |
| 65 | * to cancel operation. */ | |
| 66 | err = -ERESTARTSYS; | |
| 67 | if (mutex_lock_interruptible(&bus->sprom_mutex)) | |
| 68 | goto out_kfree; | |
| 69 | err = sprom_read(bus, sprom); | |
| 70 | mutex_unlock(&bus->sprom_mutex); | |
| 71 | ||
| 72 | if (!err) | |
| 73 | count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words); | |
| 74 | ||
| 75 | out_kfree: | |
| 76 | kfree(sprom); | |
| 77 | out: | |
| 78 | return err ? err : count; | |
| 79 | } | |
| 80 | ||
| 81 | /* Common sprom device-attribute store-handler */ | |
| 82 | ssize_t ssb_attr_sprom_store(struct ssb_bus *bus, | |
| 83 | const char *buf, size_t count, | |
| 84 | int (*sprom_check_crc)(const u16 *sprom, size_t size), | |
| 85 | int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom)) | |
| 86 | { | |
| 87 | u16 *sprom; | |
| 88 | int res = 0, err = -ENOMEM; | |
| 89 | size_t sprom_size_words = bus->sprom_size; | |
| 90 | ||
| 91 | sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL); | |
| 92 | if (!sprom) | |
| 93 | goto out; | |
| 94 | err = hex2sprom(sprom, buf, count, sprom_size_words); | |
| 95 | if (err) { | |
| 96 | err = -EINVAL; | |
| 97 | goto out_kfree; | |
| 98 | } | |
| 99 | err = sprom_check_crc(sprom, sprom_size_words); | |
| 100 | if (err) { | |
| 101 | err = -EINVAL; | |
| 102 | goto out_kfree; | |
| 103 | } | |
| 104 | ||
| 105 | /* Use interruptible locking, as the SPROM write might | |
| 106 | * be holding the lock for several seconds. So allow userspace | |
| 107 | * to cancel operation. */ | |
| 108 | err = -ERESTARTSYS; | |
| 109 | if (mutex_lock_interruptible(&bus->sprom_mutex)) | |
| 110 | goto out_kfree; | |
| 111 | err = ssb_devices_freeze(bus); | |
| 112 | if (err == -EOPNOTSUPP) { | |
| 113 | ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze devices. " | |
| 114 | "No suspend support. Is CONFIG_PM enabled?\n"); | |
| 115 | goto out_unlock; | |
| 116 | } | |
| 117 | if (err) { | |
| 118 | ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze all devices\n"); | |
| 119 | goto out_unlock; | |
| 120 | } | |
| 121 | res = sprom_write(bus, sprom); | |
| 122 | err = ssb_devices_thaw(bus); | |
| 123 | if (err) | |
| 124 | ssb_printk(KERN_ERR PFX "SPROM write: Could not thaw all devices\n"); | |
| 125 | out_unlock: | |
| 126 | mutex_unlock(&bus->sprom_mutex); | |
| 127 | out_kfree: | |
| 128 | kfree(sprom); | |
| 129 | out: | |
| 130 | if (res) | |
| 131 | return res; | |
| 132 | return err ? err : count; | |
| 133 | } |