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ssb: Fix serial console on new bcm47xx devices

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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>
This commit is contained in:
Michael Buesch 2008-02-18 21:44:39 +01:00 committed by John W. Linville
parent 04f93a87a2
commit 58ff70d4fe
2 changed files with 37 additions and 8 deletions
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42
drivers/ssb/driver_chipcommon.c
View File

@ -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) {
/* Fixed ALP clock */
baud_base = 20000000;
div = 1;
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,
SSB_CHIPCO_CORECTL_UARTCLK0);
} else if (cc->dev->id.revision >= 3) {
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,
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);

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

@ -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