/* * 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" 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 tmp[5] = { 0 }; int cnt = 0; unsigned long parsed; if (len < sprom_size_words * 2) return -EINVAL; while (cnt < sprom_size_words) { memcpy(tmp, dump, 4); dump += 4; parsed = simple_strtoul(tmp, NULL, 16); 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; 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); if (err == -EOPNOTSUPP) { ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze devices. " "No suspend support. Is CONFIG_PM enabled?\n"); goto out_unlock; } 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(bus); 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; }