/* * Sonics Silicon Backplane * Common SPROM support routines * * Copyright (C) 2005-2008 Michael Buesch <m@bues.ch> * 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 int(*get_fallback_sprom)(struct ssb_bus *dev, struct ssb_sprom *out); 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_register_fallback_sprom - Registers a method providing a * fallback SPROM if no SPROM is found. * * @sprom_callback: The callback function. * * With this function the architecture implementation may register a * callback handler which fills the 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_register_fallback_sprom(int (*sprom_callback)(struct ssb_bus *bus, struct ssb_sprom *out)) { if (get_fallback_sprom) return -EEXIST; get_fallback_sprom = sprom_callback; return 0; } int ssb_fill_sprom_with_fallback(struct ssb_bus *bus, struct ssb_sprom *out) { if (!get_fallback_sprom) return -ENOENT; return get_fallback_sprom(bus, out); } /* 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 && /* can be unavailable! */ bus->chipco.dev->id.revision >= 31) return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM; return true; }