When binding the driver, check the ID register for a valid
identity, in case the SM501 is not functioning correctly.
Signed-off-by: Ben Dooks <[email protected]>
Index: linux-2.6.21-quilt8/drivers/mfd/sm501.c
===================================================================
--- linux-2.6.21-quilt8.orig/drivers/mfd/sm501.c 2007-06-13 11:33:55.000000000 +0100
+++ linux-2.6.21-quilt8/drivers/mfd/sm501.c 2007-06-13 12:59:31.000000000 +0100
@@ -883,6 +883,7 @@ static int sm501_init_dev(struct sm501_d
{
resource_size_t mem_avail;
unsigned long dramctrl;
+ unsigned long devid;
int ret;
mutex_init(&sm->clock_lock);
@@ -890,13 +891,18 @@ static int sm501_init_dev(struct sm501_d
INIT_LIST_HEAD(&sm->devices);
- dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
+ devid = readl(sm->regs + SM501_DEVICEID);
+ if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
+ dev_err(sm->dev, "incorrect device id %08lx\n", devid);
+ return -EINVAL;
+ }
+
+ dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
- dev_info(sm->dev, "SM501 At %p: Version %08x, %ld Mb, IRQ %d\n",
- sm->regs, readl(sm->regs + SM501_DEVICEID),
- (unsigned long)mem_avail >> 20, sm->irq);
+ dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
+ sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
sm501_dump_gate(sm);
Index: linux-2.6.21-quilt8/include/linux/sm501-regs.h
===================================================================
--- linux-2.6.21-quilt8.orig/include/linux/sm501-regs.h 2007-06-13 11:33:55.000000000 +0100
+++ linux-2.6.21-quilt8/include/linux/sm501-regs.h 2007-06-13 11:33:56.000000000 +0100
@@ -109,6 +109,9 @@
#define SM501_DEVICEID (0x000060)
/* 0x050100A0 */
+#define SM501_DEVICEID_SM501 (0x05010000)
+#define SM501_DEVICEID_IDMASK (0xffff0000)
+
#define SM501_PLLCLOCK_COUNT (0x000064)
#define SM501_MISC_TIMING (0x000068)
#define SM501_CURRENT_SDRAM_CLOCK (0x00006C)
--
Ben ([email protected], http://www.fluff.org/)
'a smiley only costs 4 bytes'
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