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 17 static const struct ssb_sprom *fallback_sprom; 18 19 20 static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len, 21 size_t sprom_size_words) 22 { 23 int i, pos = 0; 24 25 for (i = 0; i < sprom_size_words; i++) 26 pos += snprintf(buf + pos, buf_len - pos - 1, 27 "%04X", swab16(sprom[i]) & 0xFFFF); 28 pos += snprintf(buf + pos, buf_len - pos - 1, "\n"); 29 30 return pos + 1; 31 } 32 33 static int hex2sprom(u16 *sprom, const char *dump, size_t len, 34 size_t sprom_size_words) 35 { 36 char tmp[5] = { 0 }; 37 int cnt = 0; 38 unsigned long parsed; 39 40 if (len < sprom_size_words * 2) 41 return -EINVAL; 42 43 while (cnt < sprom_size_words) { 44 memcpy(tmp, dump, 4); 45 dump += 4; 46 parsed = simple_strtoul(tmp, NULL, 16); 47 sprom[cnt++] = swab16((u16)parsed); 48 } 49 50 return 0; 51 } 52 53 /* Common sprom device-attribute show-handler */ 54 ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf, 55 int (*sprom_read)(struct ssb_bus *bus, u16 *sprom)) 56 { 57 u16 *sprom; 58 int err = -ENOMEM; 59 ssize_t count = 0; 60 size_t sprom_size_words = bus->sprom_size; 61 62 sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL); 63 if (!sprom) 64 goto out; 65 66 /* Use interruptible locking, as the SPROM write might 67 * be holding the lock for several seconds. So allow userspace 68 * to cancel operation. */ 69 err = -ERESTARTSYS; 70 if (mutex_lock_interruptible(&bus->sprom_mutex)) 71 goto out_kfree; 72 err = sprom_read(bus, sprom); 73 mutex_unlock(&bus->sprom_mutex); 74 75 if (!err) 76 count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words); 77 78 out_kfree: 79 kfree(sprom); 80 out: 81 return err ? err : count; 82 } 83 84 /* Common sprom device-attribute store-handler */ 85 ssize_t ssb_attr_sprom_store(struct ssb_bus *bus, 86 const char *buf, size_t count, 87 int (*sprom_check_crc)(const u16 *sprom, size_t size), 88 int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom)) 89 { 90 u16 *sprom; 91 int res = 0, err = -ENOMEM; 92 size_t sprom_size_words = bus->sprom_size; 93 94 sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL); 95 if (!sprom) 96 goto out; 97 err = hex2sprom(sprom, buf, count, sprom_size_words); 98 if (err) { 99 err = -EINVAL; 100 goto out_kfree; 101 } 102 err = sprom_check_crc(sprom, sprom_size_words); 103 if (err) { 104 err = -EINVAL; 105 goto out_kfree; 106 } 107 108 /* Use interruptible locking, as the SPROM write might 109 * be holding the lock for several seconds. So allow userspace 110 * to cancel operation. */ 111 err = -ERESTARTSYS; 112 if (mutex_lock_interruptible(&bus->sprom_mutex)) 113 goto out_kfree; 114 err = ssb_devices_freeze(bus); 115 if (err == -EOPNOTSUPP) { 116 ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze devices. " 117 "No suspend support. Is CONFIG_PM enabled?\n"); 118 goto out_unlock; 119 } 120 if (err) { 121 ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze all devices\n"); 122 goto out_unlock; 123 } 124 res = sprom_write(bus, sprom); 125 err = ssb_devices_thaw(bus); 126 if (err) 127 ssb_printk(KERN_ERR PFX "SPROM write: Could not thaw all devices\n"); 128 out_unlock: 129 mutex_unlock(&bus->sprom_mutex); 130 out_kfree: 131 kfree(sprom); 132 out: 133 if (res) 134 return res; 135 return err ? err : count; 136 } 137 138 /** 139 * ssb_arch_set_fallback_sprom - Set a fallback SPROM for use if no SPROM is found. 140 * 141 * @sprom: The SPROM data structure to register. 142 * 143 * With this function the architecture implementation may register a fallback 144 * SPROM data structure. The fallback is only used for PCI based SSB devices, 145 * where no valid SPROM can be found in the shadow registers. 146 * 147 * This function is useful for weird architectures that have a half-assed SSB device 148 * hardwired to their PCI bus. 149 * 150 * Note that it does only work with PCI attached SSB devices. PCMCIA devices currently 151 * don't use this fallback. 152 * Architectures must provide the SPROM for native SSB devices anyway, 153 * so the fallback also isn't used for native devices. 154 * 155 * This function is available for architecture code, only. So it is not exported. 156 */ 157 int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom) 158 { 159 if (fallback_sprom) 160 return -EEXIST; 161 fallback_sprom = sprom; 162 163 return 0; 164 } 165 166 const struct ssb_sprom *ssb_get_fallback_sprom(void) 167 { 168 return fallback_sprom; 169 } 170