mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 13:16:39 +07:00
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
/*
|
|
* 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 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;
|
|
}
|