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>
git-mirror · Feb 21, 2008 · 58ff70d · 58ff70d
1 parent 04f93a8
commit 58ff70d
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Showing 2 changed files with 34 additions and 5 deletions.
diff --git 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);

diff --git a/include/linux/ssb/ssb_driver_chipcommon.h b/include/linux/ssb/ssb_driver_chipcommon.h
@@ -51,9 +51,12 @@
 #define  SSB_CHIPCO_CAP_JTAGM		0x00400000	/* JTAG master present */
 #define  SSB_CHIPCO_CAP_BROM		0x00800000	/* Internal boot ROM active */
 #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_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) */
+#define  SSB_CHIPCO_CORECTL_UARTCLKEN	0x00000008	/* UART clock enable (rev >= 21) */
 #define SSB_CHIPCO_BIST			0x000C
 #define SSB_CHIPCO_OTPS			0x0010		/* OTP status */
 #define	 SSB_CHIPCO_OTPS_PROGFAIL	0x80000000