| /* |
| * Sonics Silicon Backplane |
| * Common SPROM support routines |
| * |
| * Copyright (C) 2005-2008 Michael Buesch <mb@bu3sch.de> |
| * Copyright (C) 2005 Martin Langer <martin-langer@gmx.de> |
| * Copyright (C) 2005 Stefano Brivio <st3@riseup.net> |
| * Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org> |
| * Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> |
| * |
| * Licensed under the GNU/GPL. See COPYING for details. |
| */ |
| |
| #include "ssb_private.h" |
| |
| #include <linux/ctype.h> |
| #include <linux/slab.h> |
| |
| |
| static const struct ssb_sprom *fallback_sprom; |
| |
| |
| static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len, |
| size_t sprom_size_words) |
| { |
| int i, pos = 0; |
| |
| for (i = 0; i < sprom_size_words; i++) |
| pos += snprintf(buf + pos, buf_len - pos - 1, |
| "%04X", swab16(sprom[i]) & 0xFFFF); |
| pos += snprintf(buf + pos, buf_len - pos - 1, "\n"); |
| |
| return pos + 1; |
| } |
| |
| static int hex2sprom(u16 *sprom, const char *dump, size_t len, |
| size_t sprom_size_words) |
| { |
| char c, tmp[5] = { 0 }; |
| int err, cnt = 0; |
| unsigned long parsed; |
| |
| /* Strip whitespace at the end. */ |
| while (len) { |
| c = dump[len - 1]; |
| if (!isspace(c) && c != '\0') |
| break; |
| len--; |
| } |
| /* Length must match exactly. */ |
| if (len != sprom_size_words * 4) |
| return -EINVAL; |
| |
| while (cnt < sprom_size_words) { |
| memcpy(tmp, dump, 4); |
| dump += 4; |
| err = strict_strtoul(tmp, 16, &parsed); |
| if (err) |
| return err; |
| sprom[cnt++] = swab16((u16)parsed); |
| } |
| |
| return 0; |
| } |
| |
| /* Common sprom device-attribute show-handler */ |
| ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf, |
| int (*sprom_read)(struct ssb_bus *bus, u16 *sprom)) |
| { |
| u16 *sprom; |
| int err = -ENOMEM; |
| ssize_t count = 0; |
| size_t sprom_size_words = bus->sprom_size; |
| |
| sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL); |
| if (!sprom) |
| goto out; |
| |
| /* Use interruptible locking, as the SPROM write might |
| * be holding the lock for several seconds. So allow userspace |
| * to cancel operation. */ |
| err = -ERESTARTSYS; |
| if (mutex_lock_interruptible(&bus->sprom_mutex)) |
| goto out_kfree; |
| err = sprom_read(bus, sprom); |
| mutex_unlock(&bus->sprom_mutex); |
| |
| if (!err) |
| count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words); |
| |
| out_kfree: |
| kfree(sprom); |
| out: |
| return err ? err : count; |
| } |
| |
| /* Common sprom device-attribute store-handler */ |
| ssize_t ssb_attr_sprom_store(struct ssb_bus *bus, |
| const char *buf, size_t count, |
| int (*sprom_check_crc)(const u16 *sprom, size_t size), |
| int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom)) |
| { |
| u16 *sprom; |
| int res = 0, err = -ENOMEM; |
| size_t sprom_size_words = bus->sprom_size; |
| struct ssb_freeze_context freeze; |
| |
| sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL); |
| if (!sprom) |
| goto out; |
| err = hex2sprom(sprom, buf, count, sprom_size_words); |
| if (err) { |
| err = -EINVAL; |
| goto out_kfree; |
| } |
| err = sprom_check_crc(sprom, sprom_size_words); |
| if (err) { |
| err = -EINVAL; |
| goto out_kfree; |
| } |
| |
| /* Use interruptible locking, as the SPROM write might |
| * be holding the lock for several seconds. So allow userspace |
| * to cancel operation. */ |
| err = -ERESTARTSYS; |
| if (mutex_lock_interruptible(&bus->sprom_mutex)) |
| goto out_kfree; |
| err = ssb_devices_freeze(bus, &freeze); |
| if (err) { |
| ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze all devices\n"); |
| goto out_unlock; |
| } |
| res = sprom_write(bus, sprom); |
| err = ssb_devices_thaw(&freeze); |
| if (err) |
| ssb_printk(KERN_ERR PFX "SPROM write: Could not thaw all devices\n"); |
| out_unlock: |
| mutex_unlock(&bus->sprom_mutex); |
| out_kfree: |
| kfree(sprom); |
| out: |
| if (res) |
| return res; |
| return err ? err : count; |
| } |
| |
| /** |
| * ssb_arch_set_fallback_sprom - Set a fallback SPROM for use if no SPROM is found. |
| * |
| * @sprom: The SPROM data structure to register. |
| * |
| * With this function the architecture implementation may register a fallback |
| * SPROM data structure. The fallback is only used for PCI based SSB devices, |
| * where no valid SPROM can be found in the shadow registers. |
| * |
| * This function is useful for weird architectures that have a half-assed SSB device |
| * hardwired to their PCI bus. |
| * |
| * Note that it does only work with PCI attached SSB devices. PCMCIA devices currently |
| * don't use this fallback. |
| * Architectures must provide the SPROM for native SSB devices anyway, |
| * so the fallback also isn't used for native devices. |
| * |
| * This function is available for architecture code, only. So it is not exported. |
| */ |
| int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom) |
| { |
| if (fallback_sprom) |
| return -EEXIST; |
| fallback_sprom = sprom; |
| |
| return 0; |
| } |
| |
| const struct ssb_sprom *ssb_get_fallback_sprom(void) |
| { |
| return fallback_sprom; |
| } |
| |
| /* http://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */ |
| bool ssb_is_sprom_available(struct ssb_bus *bus) |
| { |
| /* status register only exists on chipcomon rev >= 11 and we need check |
| for >= 31 only */ |
| /* this routine differs from specs as we do not access SPROM directly |
| on PCMCIA */ |
| if (bus->bustype == SSB_BUSTYPE_PCI && |
| bus->chipco.dev->id.revision >= 31) |
| return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM; |
| |
| return true; |
| } |