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ssb: do not read SPROM if it does not exist 

Attempting to read registers that don't exist on the SSB bus can cause
hangs on some boxes.  At least some b43 devices are 'in the wild' that
don't have SPROMs at all.  When the SSB bus support loads, it attempts
to read these (non-existant) SPROMs and causes hard hangs on the box --
no console output, etc.

This patch adds some intelligence to determine whether or not the SPROM
is present before attempting to read it.  This avoids those hard hangs
on those devices with no SPROM attached to their SSB bus.  The
SSB-attached devices (e.g. b43, et al.) won't work, but at least the box
will survive to test further patches. :-)

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Michael Buesch <mb@bu3sch.de>
This commit is contained in:
John W. Linville 2010-03-31 21:39:35 +02:00
parent 672724403b
commit d53cdbb94a
5 changed files with 39 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/ssb/driver_chipcommon.c
View File

@ -233,6 +233,8 @@ void ssb_chipcommon_init(struct ssb_chipcommon *cc)
{
if (!cc->dev)
return; /* We don't have a ChipCommon */
if (cc->dev->id.revision >= 11)
cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
ssb_pmu_init(cc);
chipco_powercontrol_init(cc);
ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);

5
drivers/ssb/pci.c
View File

@ -620,6 +620,11 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
int err = -ENOMEM;
u16 *buf;
if (!ssb_is_sprom_available(bus)) {
ssb_printk(KERN_ERR PFX "No SPROM available!\n");
return -ENODEV;
}
buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
if (!buf)
goto out;

14
drivers/ssb/sprom.c
View File

@ -175,3 +175,17 @@ const struct ssb_sprom *ssb_get_fallback_sprom(void)
{
return fallback_sprom;
}
/* 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->id.revision >= 31)
return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM;
return true;
}

3
include/linux/ssb/ssb.h
View File

@ -394,6 +394,9 @@ extern int ssb_bus_sdiobus_register(struct ssb_bus *bus,
extern void ssb_bus_unregister(struct ssb_bus *bus);
/* Does the device have an SPROM? */
extern bool ssb_is_sprom_available(struct ssb_bus *bus);
/* Set a fallback SPROM.
* See kdoc at the function definition for complete documentation. */
extern int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom);

15
include/linux/ssb/ssb_driver_chipcommon.h
View File

@ -53,6 +53,7 @@
#define SSB_CHIPCO_CAP_64BIT 0x08000000 /* 64-bit Backplane */
#define SSB_CHIPCO_CAP_PMU 0x10000000 /* PMU available (rev >= 20) */
#define SSB_CHIPCO_CAP_ECI 0x20000000 /* ECI available (rev >= 20) */
#define SSB_CHIPCO_CAP_SPROM 0x40000000 /* SPROM present */
#define SSB_CHIPCO_CORECTL 0x0008
#define SSB_CHIPCO_CORECTL_UARTCLK0 0x00000001 /* Drive UART with internal clock */
#define SSB_CHIPCO_CORECTL_SE 0x00000002 /* sync clk out enable (corerev >= 3) */
@ -385,6 +386,7 @@
/** Chip specific Chip-Status register contents. */
#define SSB_CHIPCO_CHST_4322_SPROM_EXISTS 0x00000040 /* SPROM present */
#define SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL 0x00000003
#define SSB_CHIPCO_CHST_4325_DEFCIS_SEL 0 /* OTP is powered up, use def. CIS, no SPROM */
#define SSB_CHIPCO_CHST_4325_SPROM_SEL 1 /* OTP is powered up, SPROM is present */
@ -398,6 +400,18 @@
#define SSB_CHIPCO_CHST_4325_RCAL_VALUE_SHIFT 4
#define SSB_CHIPCO_CHST_4325_PMUTOP_2B 0x00000200 /* 1 for 2b, 0 for to 2a */
/** Macros to determine SPROM presence based on Chip-Status register. */
#define SSB_CHIPCO_CHST_4312_SPROM_PRESENT(status) \
((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
SSB_CHIPCO_CHST_4325_OTP_SEL)
#define SSB_CHIPCO_CHST_4322_SPROM_PRESENT(status) \
(status & SSB_CHIPCO_CHST_4322_SPROM_EXISTS)
#define SSB_CHIPCO_CHST_4325_SPROM_PRESENT(status) \
(((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
SSB_CHIPCO_CHST_4325_DEFCIS_SEL) && \
((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
SSB_CHIPCO_CHST_4325_OTP_SEL))
/** Clockcontrol masks and values **/
@ -564,6 +578,7 @@ struct ssb_chipcommon_pmu {
struct ssb_chipcommon {
struct ssb_device *dev;
u32 capabilities;
u32 status;
/* Fast Powerup Delay constant */
u16 fast_pwrup_delay;
struct ssb_chipcommon_pmu pmu;