brintos

brintos / linux-shallow public Read only

0
0
Text · 5.2 KiB · 7cd5531 Raw
205 lines · c
1/*2 * Sonics Silicon Backplane3 * Common SPROM support routines4 *5 * Copyright (C) 2005-2008 Michael Buesch <m@bues.ch>6 * Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>7 * Copyright (C) 2005 Stefano Brivio <st3@riseup.net>8 * Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>9 * Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>10 *11 * Licensed under the GNU/GPL. See COPYING for details.12 */13 14#include "ssb_private.h"15 16#include <linux/ctype.h>17#include <linux/slab.h>18 19 20static int(*get_fallback_sprom)(struct ssb_bus *dev, struct ssb_sprom *out);21 22 23static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len,24		     size_t sprom_size_words)25{26	int i, pos = 0;27 28	for (i = 0; i < sprom_size_words; i++)29		pos += scnprintf(buf + pos, buf_len - pos - 1,30				"%04X", swab16(sprom[i]) & 0xFFFF);31	pos += scnprintf(buf + pos, buf_len - pos - 1, "\n");32 33	return pos + 1;34}35 36static int hex2sprom(u16 *sprom, const char *dump, size_t len,37		     size_t sprom_size_words)38{39	char c, tmp[5] = { 0 };40	int err, cnt = 0;41	unsigned long parsed;42 43	/* Strip whitespace at the end. */44	while (len) {45		c = dump[len - 1];46		if (!isspace(c) && c != '\0')47			break;48		len--;49	}50	/* Length must match exactly. */51	if (len != sprom_size_words * 4)52		return -EINVAL;53 54	while (cnt < sprom_size_words) {55		memcpy(tmp, dump, 4);56		dump += 4;57		err = kstrtoul(tmp, 16, &parsed);58		if (err)59			return err;60		sprom[cnt++] = swab16((u16)parsed);61	}62 63	return 0;64}65 66/* Common sprom device-attribute show-handler */67ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf,68			    int (*sprom_read)(struct ssb_bus *bus, u16 *sprom))69{70	u16 *sprom;71	int err = -ENOMEM;72	ssize_t count = 0;73	size_t sprom_size_words = bus->sprom_size;74 75	sprom = kcalloc(sprom_size_words, sizeof(u16), GFP_KERNEL);76	if (!sprom)77		goto out;78 79	/* Use interruptible locking, as the SPROM write might80	 * be holding the lock for several seconds. So allow userspace81	 * to cancel operation.82	 */83	err = -ERESTARTSYS;84	if (mutex_lock_interruptible(&bus->sprom_mutex))85		goto out_kfree;86	err = sprom_read(bus, sprom);87	mutex_unlock(&bus->sprom_mutex);88 89	if (!err)90		count = sprom2hex(sprom, buf, PAGE_SIZE, sprom_size_words);91 92out_kfree:93	kfree(sprom);94out:95	return err ? err : count;96}97 98/* Common sprom device-attribute store-handler */99ssize_t ssb_attr_sprom_store(struct ssb_bus *bus,100			     const char *buf, size_t count,101			     int (*sprom_check_crc)(const u16 *sprom, size_t size),102			     int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom))103{104	u16 *sprom;105	int res = 0, err = -ENOMEM;106	size_t sprom_size_words = bus->sprom_size;107	struct ssb_freeze_context freeze;108 109	sprom = kcalloc(bus->sprom_size, sizeof(u16), GFP_KERNEL);110	if (!sprom)111		goto out;112	err = hex2sprom(sprom, buf, count, sprom_size_words);113	if (err) {114		err = -EINVAL;115		goto out_kfree;116	}117	err = sprom_check_crc(sprom, sprom_size_words);118	if (err) {119		err = -EINVAL;120		goto out_kfree;121	}122 123	/* Use interruptible locking, as the SPROM write might124	 * be holding the lock for several seconds. So allow userspace125	 * to cancel operation.126	 */127	err = -ERESTARTSYS;128	if (mutex_lock_interruptible(&bus->sprom_mutex))129		goto out_kfree;130	err = ssb_devices_freeze(bus, &freeze);131	if (err) {132		pr_err("SPROM write: Could not freeze all devices\n");133		goto out_unlock;134	}135	res = sprom_write(bus, sprom);136	err = ssb_devices_thaw(&freeze);137	if (err)138		pr_err("SPROM write: Could not thaw all devices\n");139out_unlock:140	mutex_unlock(&bus->sprom_mutex);141out_kfree:142	kfree(sprom);143out:144	if (res)145		return res;146	return err ? err : count;147}148 149/**150 * ssb_arch_register_fallback_sprom - Registers a method providing a151 * fallback SPROM if no SPROM is found.152 *153 * @sprom_callback: The callback function.154 *155 * With this function the architecture implementation may register a156 * callback handler which fills the SPROM data structure. The fallback is157 * only used for PCI based SSB devices, where no valid SPROM can be found158 * in the shadow registers.159 *160 * This function is useful for weird architectures that have a half-assed161 * SSB device hardwired to their PCI bus.162 *163 * Note that it does only work with PCI attached SSB devices. PCMCIA164 * devices currently don't use this fallback.165 * Architectures must provide the SPROM for native SSB devices anyway, so166 * the fallback also isn't used for native devices.167 *168 * This function is available for architecture code, only. So it is not169 * exported.170 */171int ssb_arch_register_fallback_sprom(int (*sprom_callback)(struct ssb_bus *bus,172				     struct ssb_sprom *out))173{174	if (get_fallback_sprom)175		return -EEXIST;176	get_fallback_sprom = sprom_callback;177 178	return 0;179}180 181int ssb_fill_sprom_with_fallback(struct ssb_bus *bus, struct ssb_sprom *out)182{183	if (!get_fallback_sprom)184		return -ENOENT;185 186	return get_fallback_sprom(bus, out);187}188 189/* https://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */190bool ssb_is_sprom_available(struct ssb_bus *bus)191{192	/* status register only exists on chipcomon rev >= 11 and we need check193	 * for >= 31 only194	 */195	/* this routine differs from specs as we do not access SPROM directly196	 * on PCMCIA197	 */198	if (bus->bustype == SSB_BUSTYPE_PCI &&199	    bus->chipco.dev &&	/* can be unavailable! */200	    bus->chipco.dev->id.revision >= 31)201		return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM;202 203	return true;204}205