--- /dev/null
+/*
+ * 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 = kstrtoul(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_err("SPROM write: Could not freeze all devices\n");
+ goto out_unlock;
+ }
+ res = sprom_write(bus, sprom);
+ err = ssb_devices_thaw(&freeze);
+ if (err)
+ ssb_err("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;
+}
Code Review / kvmfornfv.git / blobdiff