1 /* 2 * Sonics Silicon Backplane 3 * Common SPROM support routines 4 * 5 * Copyright (C) 2005-2008 Michael Buesch <mb@bu3sch.de> 6 * Copyright (C) 2005 Martin Langer <martin-langer@gmx.de> 7 * Copyright (C) 2005 Stefano Brivio <st3@riseup.net> 8 * Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org> 9 * Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> 10 * 11 * Licensed under the GNU/GPL. See COPYING for details. 12 */ 13 14 #include "ssb_private.h" 15 16 #include <linux/ctype.h> 17 #include <linux/slab.h> 18 19 20 static const struct ssb_sprom *fallback_sprom; 21 22 23 static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len, 24 size_t sprom_size_words) 25 { 26 int i, pos = 0; 27 28 for (i = 0; i < sprom_size_words; i++) 29 pos += snprintf(buf + pos, buf_len - pos - 1, 30 "%04X", swab16(sprom[i]) & 0xFFFF); 31 pos += snprintf(buf + pos, buf_len - pos - 1, "\n"); 32 33 return pos + 1; 34 } 35 36 static int hex2sprom(u16 *sprom, const char *dump, size_t len, 37 size_t sprom_size_words) 38 { 39 char c, tmp[5] = { 0 }; 40 int err, cnt = 0; 41 unsigned long parsed; 42 43 /* Strip whitespace at the end. */ 44 while (len) { 45 c = dump[len - 1]; 46 if (!isspace(c) && c != '\0') 47 break; 48 len--; 49 } 50 /* Length must match exactly. */ 51 if (len != sprom_size_words * 4) 52 return -EINVAL; 53 54 while (cnt < sprom_size_words) { 55 memcpy(tmp, dump, 4); 56 dump += 4; 57 err = strict_strtoul(tmp, 16, &parsed); 58 if (err) 59 return err; 60 sprom[cnt++] = swab16((u16)parsed); 61 } 62 63 return 0; 64 } 65 66 /* Common sprom device-attribute show-handler */ 67 ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf, 68 int (*sprom_read)(struct ssb_bus *bus, u16 *sprom)) 69 { 70 u16 *sprom; 71 int err = -ENOMEM; 72 ssize_t count = 0; 73 size_t sprom_size_words = bus->sprom_size; 74 75 sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL); 76 if (!sprom) 77 goto out; 78 79 /* Use interruptible locking, as the SPROM write might 80 * be holding the lock for several seconds. So allow userspace 81 * to cancel operation. */ 82 err = -ERESTARTSYS; 83 if (mutex_lock_interruptible(&bus->sprom_mutex)) 84 goto out_kfree; 85 err = sprom_read(bus, sprom); 86 mutex_unlock(&bus->sprom_mutex); 87 88 if (!err) 89 count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words); 90 91 out_kfree: 92 kfree(sprom); 93 out: 94 return err ? err : count; 95 } 96 97 /* Common sprom device-attribute store-handler */ 98 ssize_t ssb_attr_sprom_store(struct ssb_bus *bus, 99 const char *buf, size_t count, 100 int (*sprom_check_crc)(const u16 *sprom, size_t size), 101 int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom)) 102 { 103 u16 *sprom; 104 int res = 0, err = -ENOMEM; 105 size_t sprom_size_words = bus->sprom_size; 106 struct ssb_freeze_context freeze; 107 108 sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL); 109 if (!sprom) 110 goto out; 111 err = hex2sprom(sprom, buf, count, sprom_size_words); 112 if (err) { 113 err = -EINVAL; 114 goto out_kfree; 115 } 116 err = sprom_check_crc(sprom, sprom_size_words); 117 if (err) { 118 err = -EINVAL; 119 goto out_kfree; 120 } 121 122 /* Use interruptible locking, as the SPROM write might 123 * be holding the lock for several seconds. So allow userspace 124 * to cancel operation. */ 125 err = -ERESTARTSYS; 126 if (mutex_lock_interruptible(&bus->sprom_mutex)) 127 goto out_kfree; 128 err = ssb_devices_freeze(bus, &freeze); 129 if (err) { 130 ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze all devices\n"); 131 goto out_unlock; 132 } 133 res = sprom_write(bus, sprom); 134 err = ssb_devices_thaw(&freeze); 135 if (err) 136 ssb_printk(KERN_ERR PFX "SPROM write: Could not thaw all devices\n"); 137 out_unlock: 138 mutex_unlock(&bus->sprom_mutex); 139 out_kfree: 140 kfree(sprom); 141 out: 142 if (res) 143 return res; 144 return err ? err : count; 145 } 146 147 /** 148 * ssb_arch_set_fallback_sprom - Set a fallback SPROM for use if no SPROM is found. 149 * 150 * @sprom: The SPROM data structure to register. 151 * 152 * With this function the architecture implementation may register a fallback 153 * SPROM data structure. The fallback is only used for PCI based SSB devices, 154 * where no valid SPROM can be found in the shadow registers. 155 * 156 * This function is useful for weird architectures that have a half-assed SSB device 157 * hardwired to their PCI bus. 158 * 159 * Note that it does only work with PCI attached SSB devices. PCMCIA devices currently 160 * don't use this fallback. 161 * Architectures must provide the SPROM for native SSB devices anyway, 162 * so the fallback also isn't used for native devices. 163 * 164 * This function is available for architecture code, only. So it is not exported. 165 */ 166 int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom) 167 { 168 if (fallback_sprom) 169 return -EEXIST; 170 fallback_sprom = sprom; 171 172 return 0; 173 } 174 175 const struct ssb_sprom *ssb_get_fallback_sprom(void) 176 { 177 return fallback_sprom; 178 } 179 180 /* http://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */ 181 bool ssb_is_sprom_available(struct ssb_bus *bus) 182 { 183 /* status register only exists on chipcomon rev >= 11 and we need check 184 for >= 31 only */ 185 /* this routine differs from specs as we do not access SPROM directly 186 on PCMCIA */ 187 if (bus->bustype == SSB_BUSTYPE_PCI && 188 bus->chipco.dev->id.revision >= 31) 189 return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM; 190 191 return true; 192 } 193