drivers/bcma/driver_chipcommon.c - kernel/msm-4.9 - Gitiles

 /*
  * Broadcom specific AMBA
  * ChipCommon core driver
  *
  * Copyright 2005, Broadcom Corporation
  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
  * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */

 #include "bcma_private.h"
 #include <linux/bcm47xx_wdt.h>
 #include <linux/export.h>
 #include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>

 static inline u32 bcma_cc_write32_masked(struct bcma_drv_cc *cc, u16 offset,
 					 u32 mask, u32 value)
 {
 	value &= mask;
 	value |= bcma_cc_read32(cc, offset) & ~mask;
 	bcma_cc_write32(cc, offset, value);

 	return value;
 }

 u32 bcma_chipco_get_alp_clock(struct bcma_drv_cc *cc)
 {
 	if (cc->capabilities & BCMA_CC_CAP_PMU)
 		return bcma_pmu_get_alp_clock(cc);

 	return 20000000;
 }
 EXPORT_SYMBOL_GPL(bcma_chipco_get_alp_clock);

 static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
 {
 	struct bcma_bus *bus = cc->core->bus;
 	u32 nb;

 	if (cc->capabilities & BCMA_CC_CAP_PMU) {
 		if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
 			nb = 32;
 		else if (cc->core->id.rev < 26)
 			nb = 16;
 		else
 			nb = (cc->core->id.rev >= 37) ? 32 : 24;
 	} else {
 		nb = 28;
 	}
 	if (nb == 32)
 		return 0xffffffff;
 	else
 		return (1 << nb) - 1;
 }

 static u32 bcma_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt,
 					      u32 ticks)
 {
 	struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);

 	return bcma_chipco_watchdog_timer_set(cc, ticks);
 }

 static u32 bcma_chipco_watchdog_timer_set_ms_wdt(struct bcm47xx_wdt *wdt,
 						 u32 ms)
 {
 	struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
 	u32 ticks;

 	ticks = bcma_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
 	return ticks / cc->ticks_per_ms;
 }

 static int bcma_chipco_watchdog_ticks_per_ms(struct bcma_drv_cc *cc)
 {
 	struct bcma_bus *bus = cc->core->bus;

 	if (cc->capabilities & BCMA_CC_CAP_PMU) {
 		if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
 			/* 4706 CC and PMU watchdogs are clocked at 1/4 of ALP clock */
 			return bcma_chipco_get_alp_clock(cc) / 4000;
 		else
 			/* based on 32KHz ILP clock */
 			return 32;
 	} else {
 		return bcma_chipco_get_alp_clock(cc) / 1000;
 	}
 }

 int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc)
 {
 	struct bcm47xx_wdt wdt = {};
 	struct platform_device *pdev;

 	wdt.driver_data = cc;
 	wdt.timer_set = bcma_chipco_watchdog_timer_set_wdt;
 	wdt.timer_set_ms = bcma_chipco_watchdog_timer_set_ms_wdt;
 	wdt.max_timer_ms = bcma_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;

 	pdev = platform_device_register_data(NULL, "bcm47xx-wdt",
 					     cc->core->bus->num, &wdt,
 					     sizeof(wdt));
 	if (IS_ERR(pdev))
 		return PTR_ERR(pdev);

 	cc->watchdog = pdev;

 	return 0;
 }

 void bcma_core_chipcommon_early_init(struct bcma_drv_cc *cc)
 {
 	if (cc->early_setup_done)
 		return;

 	spin_lock_init(&cc->gpio_lock);

 	if (cc->core->id.rev >= 11)
 		cc->status = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
 	cc->capabilities = bcma_cc_read32(cc, BCMA_CC_CAP);
 	if (cc->core->id.rev >= 35)
 		cc->capabilities_ext = bcma_cc_read32(cc, BCMA_CC_CAP_EXT);

 	if (cc->capabilities & BCMA_CC_CAP_PMU)
 		bcma_pmu_early_init(cc);

 	cc->early_setup_done = true;
 }

 void bcma_core_chipcommon_init(struct bcma_drv_cc *cc)
 {
 	u32 leddc_on = 10;
 	u32 leddc_off = 90;

 	if (cc->setup_done)
 		return;

 	bcma_core_chipcommon_early_init(cc);

 	if (cc->core->id.rev >= 20) {
 		u32 pullup = 0, pulldown = 0;

 		if (cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM43142) {
 			pullup = 0x402e0;
 			pulldown = 0x20500;
 		}

 		bcma_cc_write32(cc, BCMA_CC_GPIOPULLUP, pullup);
 		bcma_cc_write32(cc, BCMA_CC_GPIOPULLDOWN, pulldown);
 	}

 	if (cc->capabilities & BCMA_CC_CAP_PMU)
 		bcma_pmu_init(cc);
 	if (cc->capabilities & BCMA_CC_CAP_PCTL)
 		bcma_err(cc->core->bus, "Power control not implemented!\n");

 	if (cc->core->id.rev >= 16) {
 		if (cc->core->bus->sprom.leddc_on_time &&
 		    cc->core->bus->sprom.leddc_off_time) {
 			leddc_on = cc->core->bus->sprom.leddc_on_time;
 			leddc_off = cc->core->bus->sprom.leddc_off_time;
 		}
 		bcma_cc_write32(cc, BCMA_CC_GPIOTIMER,
 			((leddc_on << BCMA_CC_GPIOTIMER_ONTIME_SHIFT) |
 			 (leddc_off << BCMA_CC_GPIOTIMER_OFFTIME_SHIFT)));
 	}
 	cc->ticks_per_ms = bcma_chipco_watchdog_ticks_per_ms(cc);

 	cc->setup_done = true;
 }

 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
 u32 bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc, u32 ticks)
 {
 	u32 maxt;
 	enum bcma_clkmode clkmode;

 	maxt = bcma_chipco_watchdog_get_max_timer(cc);
 	if (cc->capabilities & BCMA_CC_CAP_PMU) {
 		if (ticks == 1)
 			ticks = 2;
 		else if (ticks > maxt)
 			ticks = maxt;
 		bcma_cc_write32(cc, BCMA_CC_PMU_WATCHDOG, ticks);
 	} else {
 		clkmode = ticks ? BCMA_CLKMODE_FAST : BCMA_CLKMODE_DYNAMIC;
 		bcma_core_set_clockmode(cc->core, clkmode);
 		if (ticks > maxt)
 			ticks = maxt;
 		/* instant NMI */
 		bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
 	}
 	return ticks;
 }

 void bcma_chipco_irq_mask(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	bcma_cc_write32_masked(cc, BCMA_CC_IRQMASK, mask, value);
 }

 u32 bcma_chipco_irq_status(struct bcma_drv_cc *cc, u32 mask)
 {
 	return bcma_cc_read32(cc, BCMA_CC_IRQSTAT) & mask;
 }

 u32 bcma_chipco_gpio_in(struct bcma_drv_cc *cc, u32 mask)
 {
 	return bcma_cc_read32(cc, BCMA_CC_GPIOIN) & mask;
 }

 u32 bcma_chipco_gpio_out(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUT, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }
 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_out);

 u32 bcma_chipco_gpio_outen(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUTEN, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }
 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_outen);

 /*
  * If the bit is set to 0, chipcommon controlls this GPIO,
  * if the bit is set to 1, it is used by some part of the chip and not our code.
  */
 u32 bcma_chipco_gpio_control(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOCTL, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }
 EXPORT_SYMBOL_GPL(bcma_chipco_gpio_control);

 u32 bcma_chipco_gpio_intmask(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOIRQ, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }

 u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }

 u32 bcma_chipco_gpio_pullup(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	if (cc->core->id.rev < 20)
 		return 0;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLUP, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }

 u32 bcma_chipco_gpio_pulldown(struct bcma_drv_cc *cc, u32 mask, u32 value)
 {
 	unsigned long flags;
 	u32 res;

 	if (cc->core->id.rev < 20)
 		return 0;

 	spin_lock_irqsave(&cc->gpio_lock, flags);
 	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLDOWN, mask, value);
 	spin_unlock_irqrestore(&cc->gpio_lock, flags);

 	return res;
 }

 #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) {
 		baud_base = bcma_chipco_get_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 {
 		bcma_err(cc->core->bus, "serial not supported on this device ccrev: 0x%x\n", ccrev);
 		return;
 	}

 	irq = bcma_core_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 */
	/*
	* Broadcom specific AMBA
	* ChipCommon core driver
	*
	* Copyright 2005, Broadcom Corporation
	* Copyright 2006, 2007, Michael Buesch <m@bues.ch>
	* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
	*
	* Licensed under the GNU/GPL. See COPYING for details.
	*/

	#include "bcma_private.h"
	#include <linux/bcm47xx_wdt.h>
	#include <linux/export.h>
	#include <linux/platform_device.h>
	#include <linux/bcma/bcma.h>

	static inline u32 bcma_cc_write32_masked(struct bcma_drv_cc *cc, u16 offset,
	u32 mask, u32 value)
	{
	value &= mask;
	value \|= bcma_cc_read32(cc, offset) & ~mask;
	bcma_cc_write32(cc, offset, value);

	return value;
	}

	u32 bcma_chipco_get_alp_clock(struct bcma_drv_cc *cc)
	{
	if (cc->capabilities & BCMA_CC_CAP_PMU)
	return bcma_pmu_get_alp_clock(cc);

	return 20000000;
	}
	EXPORT_SYMBOL_GPL(bcma_chipco_get_alp_clock);

	static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
	{
	struct bcma_bus *bus = cc->core->bus;
	u32 nb;

	if (cc->capabilities & BCMA_CC_CAP_PMU) {
	if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
	nb = 32;
	else if (cc->core->id.rev < 26)
	nb = 16;
	else
	nb = (cc->core->id.rev >= 37) ? 32 : 24;
	} else {
	nb = 28;
	}
	if (nb == 32)
	return 0xffffffff;
	else
	return (1 << nb) - 1;
	}

	static u32 bcma_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt,
	u32 ticks)
	{
	struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);

	return bcma_chipco_watchdog_timer_set(cc, ticks);
	}

	static u32 bcma_chipco_watchdog_timer_set_ms_wdt(struct bcm47xx_wdt *wdt,
	u32 ms)
	{
	struct bcma_drv_cc *cc = bcm47xx_wdt_get_drvdata(wdt);
	u32 ticks;

	ticks = bcma_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
	return ticks / cc->ticks_per_ms;
	}

	static int bcma_chipco_watchdog_ticks_per_ms(struct bcma_drv_cc *cc)
	{
	struct bcma_bus *bus = cc->core->bus;

	if (cc->capabilities & BCMA_CC_CAP_PMU) {
	if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
	/* 4706 CC and PMU watchdogs are clocked at 1/4 of ALP clock */
	return bcma_chipco_get_alp_clock(cc) / 4000;
	else
	/* based on 32KHz ILP clock */
	return 32;
	} else {
	return bcma_chipco_get_alp_clock(cc) / 1000;
	}
	}

	int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc)
	{
	struct bcm47xx_wdt wdt = {};
	struct platform_device *pdev;

	wdt.driver_data = cc;
	wdt.timer_set = bcma_chipco_watchdog_timer_set_wdt;
	wdt.timer_set_ms = bcma_chipco_watchdog_timer_set_ms_wdt;
	wdt.max_timer_ms = bcma_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;

	pdev = platform_device_register_data(NULL, "bcm47xx-wdt",
	cc->core->bus->num, &wdt,
	sizeof(wdt));
	if (IS_ERR(pdev))
	return PTR_ERR(pdev);

	cc->watchdog = pdev;

	return 0;
	}

	void bcma_core_chipcommon_early_init(struct bcma_drv_cc *cc)
	{
	if (cc->early_setup_done)
	return;

	spin_lock_init(&cc->gpio_lock);

	if (cc->core->id.rev >= 11)
	cc->status = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
	cc->capabilities = bcma_cc_read32(cc, BCMA_CC_CAP);
	if (cc->core->id.rev >= 35)
	cc->capabilities_ext = bcma_cc_read32(cc, BCMA_CC_CAP_EXT);

	if (cc->capabilities & BCMA_CC_CAP_PMU)
	bcma_pmu_early_init(cc);

	cc->early_setup_done = true;
	}

	void bcma_core_chipcommon_init(struct bcma_drv_cc *cc)
	{
	u32 leddc_on = 10;
	u32 leddc_off = 90;

	if (cc->setup_done)
	return;

	bcma_core_chipcommon_early_init(cc);

	if (cc->core->id.rev >= 20) {
	u32 pullup = 0, pulldown = 0;

	if (cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM43142) {
	pullup = 0x402e0;
	pulldown = 0x20500;
	}

	bcma_cc_write32(cc, BCMA_CC_GPIOPULLUP, pullup);
	bcma_cc_write32(cc, BCMA_CC_GPIOPULLDOWN, pulldown);
	}

	if (cc->capabilities & BCMA_CC_CAP_PMU)
	bcma_pmu_init(cc);
	if (cc->capabilities & BCMA_CC_CAP_PCTL)
	bcma_err(cc->core->bus, "Power control not implemented!\n");

	if (cc->core->id.rev >= 16) {
	if (cc->core->bus->sprom.leddc_on_time &&
	cc->core->bus->sprom.leddc_off_time) {
	leddc_on = cc->core->bus->sprom.leddc_on_time;
	leddc_off = cc->core->bus->sprom.leddc_off_time;
	}
	bcma_cc_write32(cc, BCMA_CC_GPIOTIMER,
	((leddc_on << BCMA_CC_GPIOTIMER_ONTIME_SHIFT) \|
	(leddc_off << BCMA_CC_GPIOTIMER_OFFTIME_SHIFT)));
	}
	cc->ticks_per_ms = bcma_chipco_watchdog_ticks_per_ms(cc);

	cc->setup_done = true;
	}

	/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
	u32 bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc, u32 ticks)
	{
	u32 maxt;
	enum bcma_clkmode clkmode;

	maxt = bcma_chipco_watchdog_get_max_timer(cc);
	if (cc->capabilities & BCMA_CC_CAP_PMU) {
	if (ticks == 1)
	ticks = 2;
	else if (ticks > maxt)
	ticks = maxt;
	bcma_cc_write32(cc, BCMA_CC_PMU_WATCHDOG, ticks);
	} else {
	clkmode = ticks ? BCMA_CLKMODE_FAST : BCMA_CLKMODE_DYNAMIC;
	bcma_core_set_clockmode(cc->core, clkmode);
	if (ticks > maxt)
	ticks = maxt;
	/* instant NMI */
	bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
	}
	return ticks;
	}

	void bcma_chipco_irq_mask(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	bcma_cc_write32_masked(cc, BCMA_CC_IRQMASK, mask, value);
	}

	u32 bcma_chipco_irq_status(struct bcma_drv_cc *cc, u32 mask)
	{
	return bcma_cc_read32(cc, BCMA_CC_IRQSTAT) & mask;
	}

	u32 bcma_chipco_gpio_in(struct bcma_drv_cc *cc, u32 mask)
	{
	return bcma_cc_read32(cc, BCMA_CC_GPIOIN) & mask;
	}

	u32 bcma_chipco_gpio_out(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUT, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}
	EXPORT_SYMBOL_GPL(bcma_chipco_gpio_out);

	u32 bcma_chipco_gpio_outen(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOOUTEN, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}
	EXPORT_SYMBOL_GPL(bcma_chipco_gpio_outen);

	/*
	* If the bit is set to 0, chipcommon controlls this GPIO,
	* if the bit is set to 1, it is used by some part of the chip and not our code.
	*/
	u32 bcma_chipco_gpio_control(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOCTL, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}
	EXPORT_SYMBOL_GPL(bcma_chipco_gpio_control);

	u32 bcma_chipco_gpio_intmask(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOIRQ, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}

	u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}

	u32 bcma_chipco_gpio_pullup(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	if (cc->core->id.rev < 20)
	return 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLUP, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}

	u32 bcma_chipco_gpio_pulldown(struct bcma_drv_cc *cc, u32 mask, u32 value)
	{
	unsigned long flags;
	u32 res;

	if (cc->core->id.rev < 20)
	return 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = bcma_cc_write32_masked(cc, BCMA_CC_GPIOPULLDOWN, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
	}

	#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) {
	baud_base = bcma_chipco_get_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 {
	bcma_err(cc->core->bus, "serial not supported on this device ccrev: 0x%x\n", ccrev);
	return;
	}

	irq = bcma_core_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 */