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https://github.com/edk2-porting/linux-next.git
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e7ec2e3230
This adds support for reading/writing the SPROM invariants for PCMCIA based devices. Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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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 <mb@bu3sch.de>
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* Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
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* Copyright (C) 2005 Stefano Brivio <st3@riseup.net>
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* Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
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* Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
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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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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 += snprintf(buf + pos, buf_len - pos - 1,
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"%04X", swab16(sprom[i]) & 0xFFFF);
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pos += snprintf(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 tmp[5] = { 0 };
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int cnt = 0;
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unsigned long parsed;
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if (len < sprom_size_words * 2)
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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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parsed = simple_strtoul(tmp, NULL, 16);
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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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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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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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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);
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if (err == -EOPNOTSUPP) {
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ssb_printk(KERN_ERR PFX "SPROM write: Could not freeze devices. "
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"No suspend support. Is CONFIG_PM enabled?\n");
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goto out_unlock;
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}
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if (err) {
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ssb_printk(KERN_ERR PFX "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(bus);
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if (err)
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ssb_printk(KERN_ERR PFX "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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