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authorMichael Buesch <mb@bu3sch.de>2008-02-18 23:44:39 +0300
committerJohn W. Linville <linville@tuxdriver.com>2008-02-21 04:11:48 +0300
commit58ff70d4feae29cbb7ace410fa6585ef3afb44b6 (patch)
tree298ddfd64df8fbab670538202f93cf0bc028605a /drivers/ssb/driver_chipcommon.c
parent04f93a87a2db84e7214a4ec56fccd2289e973ce5 (diff)
downloadlinux-58ff70d4feae29cbb7ace410fa6585ef3afb44b6.tar.xz
ssb: Fix serial console on new bcm47xx devices
This fixes the baud settings for new devices like the Linksys WRT350n. Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/ssb/driver_chipcommon.c')
-rw-r--r--drivers/ssb/driver_chipcommon.c36
1 files changed, 31 insertions, 5 deletions
diff --git a/drivers/ssb/driver_chipcommon.c b/drivers/ssb/driver_chipcommon.c
index 6fbf1c53b6f2..7cc03f2dd5a6 100644
--- a/drivers/ssb/driver_chipcommon.c
+++ b/drivers/ssb/driver_chipcommon.c
@@ -376,6 +376,7 @@ int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
unsigned int irq;
u32 baud_base, div;
u32 i, n;
+ unsigned int ccrev = cc->dev->id.revision;
plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
irq = ssb_mips_irq(cc->dev);
@@ -387,14 +388,39 @@ int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
div = 1;
} else {
- if (cc->dev->id.revision >= 11) {
+ if (ccrev == 20) {
+ /* BCM5354 uses constant 25MHz clock */
+ baud_base = 25000000;
+ div = 48;
+ /* Set the override bit so we don't divide it */
+ chipco_write32(cc, SSB_CHIPCO_CORECTL,
+ chipco_read32(cc, SSB_CHIPCO_CORECTL)
+ | SSB_CHIPCO_CORECTL_UARTCLK0);
+ } else if ((ccrev >= 11) && (ccrev != 15)) {
/* Fixed ALP clock */
baud_base = 20000000;
+ if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
+ /* FIXME: baud_base is different for devices with a PMU */
+ SSB_WARN_ON(1);
+ }
div = 1;
+ if (ccrev >= 21) {
+ /* Turn off UART clock before switching clocksource. */
+ chipco_write32(cc, SSB_CHIPCO_CORECTL,
+ chipco_read32(cc, SSB_CHIPCO_CORECTL)
+ & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
+ }
/* Set the override bit so we don't divide it */
chipco_write32(cc, SSB_CHIPCO_CORECTL,
- SSB_CHIPCO_CORECTL_UARTCLK0);
- } else if (cc->dev->id.revision >= 3) {
+ chipco_read32(cc, SSB_CHIPCO_CORECTL)
+ | SSB_CHIPCO_CORECTL_UARTCLK0);
+ if (ccrev >= 21) {
+ /* Re-enable the UART clock. */
+ chipco_write32(cc, SSB_CHIPCO_CORECTL,
+ chipco_read32(cc, SSB_CHIPCO_CORECTL)
+ | SSB_CHIPCO_CORECTL_UARTCLKEN);
+ }
+ } else if (ccrev >= 3) {
/* Internal backplane clock */
baud_base = ssb_clockspeed(bus);
div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
@@ -406,7 +432,7 @@ int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
}
/* Clock source depends on strapping if UartClkOverride is unset */
- if ((cc->dev->id.revision > 0) &&
+ if ((ccrev > 0) &&
!(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
SSB_CHIPCO_CAP_UARTCLK_INT) {
@@ -428,7 +454,7 @@ int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
/* Offset changed at after rev 0 */
- if (cc->dev->id.revision == 0)
+ if (ccrev == 0)
uart_regs += (i * 8);
else
uart_regs += (i * 256);