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>

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);