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