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bcma: add serial console support 

This adds support for serial console to bcma, when operating on an SoC.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Hauke Mehrtens 2011-07-23 01:20:10 +02:00 committed by John W. Linville
parent 21e0534ad7
commit e3afe0e5be
5 changed files with 97 additions and 0 deletions
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8
drivers/bcma/bcma_private.h
View File

@ -29,6 +29,14 @@ void bcma_init_bus(struct bcma_bus *bus);
/* sprom.c */
int bcma_sprom_get(struct bcma_bus *bus);
/* driver_chipcommon.c */
#ifdef CONFIG_BCMA_DRIVER_MIPS
void bcma_chipco_serial_init(struct bcma_drv_cc *cc);
#endif /* CONFIG_BCMA_DRIVER_MIPS */
/* driver_chipcommon_pmu.c */
u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc);
#ifdef CONFIG_BCMA_HOST_PCI
/* host_pci.c */
extern int __init bcma_host_pci_init(void);

48
drivers/bcma/driver_chipcommon.c
View File

@ -106,3 +106,51 @@ u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 mask, u32 value)
{
return bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
}
#ifdef CONFIG_BCMA_DRIVER_MIPS
void bcma_chipco_serial_init(struct bcma_drv_cc *cc)
{
unsigned int irq;
u32 baud_base;
u32 i;
unsigned int ccrev = cc->core->id.rev;
struct bcma_serial_port *ports = cc->serial_ports;
if (ccrev >= 11 && ccrev != 15) {
/* Fixed ALP clock */
baud_base = bcma_pmu_alp_clock(cc);
if (ccrev >= 21) {
/* Turn off UART clock before switching clocksource. */
bcma_cc_write32(cc, BCMA_CC_CORECTL,
bcma_cc_read32(cc, BCMA_CC_CORECTL)
& ~BCMA_CC_CORECTL_UARTCLKEN);
}
/* Set the override bit so we don't divide it */
bcma_cc_write32(cc, BCMA_CC_CORECTL,
bcma_cc_read32(cc, BCMA_CC_CORECTL)
| BCMA_CC_CORECTL_UARTCLK0);
if (ccrev >= 21) {
/* Re-enable the UART clock. */
bcma_cc_write32(cc, BCMA_CC_CORECTL,
bcma_cc_read32(cc, BCMA_CC_CORECTL)
| BCMA_CC_CORECTL_UARTCLKEN);
}
} else {
pr_err("serial not supported on this device ccrev: 0x%x\n",
ccrev);
return;
}
irq = bcma_core_mips_irq(cc->core);
/* Determine the registers of the UARTs */
cc->nr_serial_ports = (cc->capabilities & BCMA_CC_CAP_NRUART);
for (i = 0; i < cc->nr_serial_ports; i++) {
ports[i].regs = cc->core->io_addr + BCMA_CC_UART0_DATA +
(i * 256);
ports[i].irq = irq;
ports[i].baud_base = baud_base;
ports[i].reg_shift = 0;
}
}
#endif /* CONFIG_BCMA_DRIVER_MIPS */

26
drivers/bcma/driver_chipcommon_pmu.c
View File

@ -136,3 +136,29 @@ void bcma_pmu_init(struct bcma_drv_cc *cc)
bcma_pmu_swreg_init(cc);
bcma_pmu_workarounds(cc);
}
u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc)
{
struct bcma_bus *bus = cc->core->bus;
switch (bus->chipinfo.id) {
case 0x4716:
case 0x4748:
case 47162:
case 0x4313:
case 0x5357:
case 0x4749:
case 53572:
/* always 20Mhz */
return 20000 * 1000;
case 0x5356:
case 0x5300:
/* always 25Mhz */
return 25000 * 1000;
default:
pr_warn("No ALP clock specified for %04X device, "
"pmu rev. %d, using default %d Hz\n",
bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_ALP_CLOCK);
}
return BCMA_CC_PMU_ALP_CLOCK;
}

1
drivers/bcma/driver_mips.c
View File

@ -238,6 +238,7 @@ void bcma_core_mips_init(struct bcma_drv_mips *mcore)
if (mcore->setup_done)
return;
bcma_chipco_serial_init(&bus->drv_cc);
bcma_core_mips_flash_detect(mcore);
mcore->setup_done = true;
}

14
include/linux/bcma/bcma_driver_chipcommon.h
View File

@ -241,6 +241,9 @@
#define BCMA_CC_SPROM 0x0800 /* SPROM beginning */
#define BCMA_CC_SPROM_PCIE6 0x0830 /* SPROM beginning on PCIe rev >= 6 */
/* ALP clock on pre-PMU chips */
#define BCMA_CC_PMU_ALP_CLOCK 20000000
/* Data for the PMU, if available.
* Check availability with ((struct bcma_chipcommon)->capabilities & BCMA_CC_CAP_PMU)
*/
@ -255,6 +258,14 @@ struct bcma_pflash {
u32 window;
u32 window_size;
};
struct bcma_serial_port {
void *regs;
unsigned long clockspeed;
unsigned int irq;
unsigned int baud_base;
unsigned int reg_shift;
};
#endif /* CONFIG_BCMA_DRIVER_MIPS */
struct bcma_drv_cc {
@ -268,6 +279,9 @@ struct bcma_drv_cc {
struct bcma_chipcommon_pmu pmu;
#ifdef CONFIG_BCMA_DRIVER_MIPS
struct bcma_pflash pflash;
int nr_serial_ports;
struct bcma_serial_port serial_ports[4];
#endif /* CONFIG_BCMA_DRIVER_MIPS */
};