arch/mips/ath25/ar5312.c - linux - Git at Google

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (C) 2003 Atheros Communications, Inc.,  All Rights Reserved.
  * Copyright (C) 2006 FON Technology, SL.
  * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
  * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
  * Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com>
  */

 /*
  * Platform devices for Atheros AR5312 SoCs
  */

 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/bitops.h>
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/mtd/physmap.h>
 #include <linux/reboot.h>
 #include <asm/bootinfo.h>
 #include <asm/reboot.h>
 #include <asm/time.h>

 #include <ath25_platform.h>

 #include "devices.h"
 #include "ar5312.h"
 #include "ar5312_regs.h"

 static void __iomem *ar5312_rst_base;
 static struct irq_domain *ar5312_misc_irq_domain;

 static inline u32 ar5312_rst_reg_read(u32 reg)
 {
 	return __raw_readl(ar5312_rst_base + reg);
 }

 static inline void ar5312_rst_reg_write(u32 reg, u32 val)
 {
 	__raw_writel(val, ar5312_rst_base + reg);
 }

 static inline void ar5312_rst_reg_mask(u32 reg, u32 mask, u32 val)
 {
 	u32 ret = ar5312_rst_reg_read(reg);

 	ret &= ~mask;
 	ret |= val;
 	ar5312_rst_reg_write(reg, ret);
 }

 static irqreturn_t ar5312_ahb_err_handler(int cpl, void *dev_id)
 {
 	u32 proc1 = ar5312_rst_reg_read(AR5312_PROC1);
 	u32 proc_addr = ar5312_rst_reg_read(AR5312_PROCADDR); /* clears error */
 	u32 dma1 = ar5312_rst_reg_read(AR5312_DMA1);
 	u32 dma_addr = ar5312_rst_reg_read(AR5312_DMAADDR);   /* clears error */

 	pr_emerg("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n",
 		 proc_addr, proc1, dma_addr, dma1);

 	machine_restart("AHB error"); /* Catastrophic failure */
 	return IRQ_HANDLED;
 }

 static void ar5312_misc_irq_handler(struct irq_desc *desc)
 {
 	u32 pending = ar5312_rst_reg_read(AR5312_ISR) &
 		      ar5312_rst_reg_read(AR5312_IMR);
 	unsigned nr, misc_irq = 0;

 	if (pending) {
 		struct irq_domain *domain = irq_desc_get_handler_data(desc);

 		nr = __ffs(pending);
 		misc_irq = irq_find_mapping(domain, nr);
 	}

 	if (misc_irq) {
 		generic_handle_irq(misc_irq);
 		if (nr == AR5312_MISC_IRQ_TIMER)
 			ar5312_rst_reg_read(AR5312_TIMER);
 	} else {
 		spurious_interrupt();
 	}
 }

 /* Enable the specified AR5312_MISC_IRQ interrupt */
 static void ar5312_misc_irq_unmask(struct irq_data *d)
 {
 	ar5312_rst_reg_mask(AR5312_IMR, 0, BIT(d->hwirq));
 }

 /* Disable the specified AR5312_MISC_IRQ interrupt */
 static void ar5312_misc_irq_mask(struct irq_data *d)
 {
 	ar5312_rst_reg_mask(AR5312_IMR, BIT(d->hwirq), 0);
 	ar5312_rst_reg_read(AR5312_IMR); /* flush write buffer */
 }

 static struct irq_chip ar5312_misc_irq_chip = {
 	.name		= "ar5312-misc",
 	.irq_unmask	= ar5312_misc_irq_unmask,
 	.irq_mask	= ar5312_misc_irq_mask,
 };

 static int ar5312_misc_irq_map(struct irq_domain *d, unsigned irq,
 			       irq_hw_number_t hw)
 {
 	irq_set_chip_and_handler(irq, &ar5312_misc_irq_chip, handle_level_irq);
 	return 0;
 }

 static struct irq_domain_ops ar5312_misc_irq_domain_ops = {
 	.map = ar5312_misc_irq_map,
 };

 static void ar5312_irq_dispatch(void)
 {
 	u32 pending = read_c0_status() & read_c0_cause();

 	if (pending & CAUSEF_IP2)
 		do_IRQ(AR5312_IRQ_WLAN0);
 	else if (pending & CAUSEF_IP5)
 		do_IRQ(AR5312_IRQ_WLAN1);
 	else if (pending & CAUSEF_IP6)
 		do_IRQ(AR5312_IRQ_MISC);
 	else if (pending & CAUSEF_IP7)
 		do_IRQ(ATH25_IRQ_CPU_CLOCK);
 	else
 		spurious_interrupt();
 }

 void __init ar5312_arch_init_irq(void)
 {
 	struct irq_domain *domain;
 	unsigned irq;

 	ath25_irq_dispatch = ar5312_irq_dispatch;

 	domain = irq_domain_add_linear(NULL, AR5312_MISC_IRQ_COUNT,
 				       &ar5312_misc_irq_domain_ops, NULL);
 	if (!domain)
 		panic("Failed to add IRQ domain");

 	irq = irq_create_mapping(domain, AR5312_MISC_IRQ_AHB_PROC);
 	if (request_irq(irq, ar5312_ahb_err_handler, 0, "ar5312-ahb-error",
 			NULL))
 		pr_err("Failed to register ar5312-ahb-error interrupt\n");

 	irq_set_chained_handler_and_data(AR5312_IRQ_MISC,
 					 ar5312_misc_irq_handler, domain);

 	ar5312_misc_irq_domain = domain;
 }

 static struct physmap_flash_data ar5312_flash_data = {
 	.width = 2,
 };

 static struct resource ar5312_flash_resource = {
 	.start = AR5312_FLASH_BASE,
 	.end = AR5312_FLASH_BASE + AR5312_FLASH_SIZE - 1,
 	.flags = IORESOURCE_MEM,
 };

 static struct platform_device ar5312_physmap_flash = {
 	.name = "physmap-flash",
 	.id = 0,
 	.dev.platform_data = &ar5312_flash_data,
 	.resource = &ar5312_flash_resource,
 	.num_resources = 1,
 };

 static void __init ar5312_flash_init(void)
 {
 	void __iomem *flashctl_base;
 	u32 ctl;

 	flashctl_base = ioremap(AR5312_FLASHCTL_BASE,
 					AR5312_FLASHCTL_SIZE);

 	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0);
 	ctl &= AR5312_FLASHCTL_MW;

 	/* fixup flash width */
 	switch (ctl) {
 	case AR5312_FLASHCTL_MW16:
 		ar5312_flash_data.width = 2;
 		break;
 	case AR5312_FLASHCTL_MW8:
 	default:
 		ar5312_flash_data.width = 1;
 		break;
 	}

 	/*
 	 * Configure flash bank 0.
 	 * Assume 8M window size. Flash will be aliased if it's smaller
 	 */
 	ctl |= AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_8M | AR5312_FLASHCTL_RBLE;
 	ctl |= 0x01 << AR5312_FLASHCTL_IDCY_S;
 	ctl |= 0x07 << AR5312_FLASHCTL_WST1_S;
 	ctl |= 0x07 << AR5312_FLASHCTL_WST2_S;
 	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL0);

 	/* Disable other flash banks */
 	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL1);
 	ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC);
 	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL1);
 	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL2);
 	ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC);
 	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL2);

 	iounmap(flashctl_base);
 }

 void __init ar5312_init_devices(void)
 {
 	struct ath25_boarddata *config;

 	ar5312_flash_init();

 	/* Locate board/radio config data */
 	ath25_find_config(AR5312_FLASH_BASE, AR5312_FLASH_SIZE);
 	config = ath25_board.config;

 	/* AR2313 has CPU minor rev. 10 */
 	if ((current_cpu_data.processor_id & 0xff) == 0x0a)
 		ath25_soc = ATH25_SOC_AR2313;

 	/* AR2312 shares the same Silicon ID as AR5312 */
 	else if (config->flags & BD_ISCASPER)
 		ath25_soc = ATH25_SOC_AR2312;

 	/* Everything else is probably AR5312 or compatible */
 	else
 		ath25_soc = ATH25_SOC_AR5312;

 	platform_device_register(&ar5312_physmap_flash);

 	switch (ath25_soc) {
 	case ATH25_SOC_AR5312:
 		if (!ath25_board.radio)
 			return;

 		if (!(config->flags & BD_WLAN0))
 			break;

 		ath25_add_wmac(0, AR5312_WLAN0_BASE, AR5312_IRQ_WLAN0);
 		break;
 	case ATH25_SOC_AR2312:
 	case ATH25_SOC_AR2313:
 		if (!ath25_board.radio)
 			return;
 		break;
 	default:
 		break;
 	}

 	if (config->flags & BD_WLAN1)
 		ath25_add_wmac(1, AR5312_WLAN1_BASE, AR5312_IRQ_WLAN1);
 }

 static void ar5312_restart(char *command)
 {
 	/* reset the system */
 	local_irq_disable();
 	while (1)
 		ar5312_rst_reg_write(AR5312_RESET, AR5312_RESET_SYSTEM);
 }

 /*
  * This table is indexed by bits 5..4 of the CLOCKCTL1 register
  * to determine the predevisor value.
  */
 static unsigned clockctl1_predivide_table[4] __initdata = { 1, 2, 4, 5 };

 static unsigned __init ar5312_cpu_frequency(void)
 {
 	u32 scratch, devid, clock_ctl1;
 	u32 predivide_mask, multiplier_mask, doubler_mask;
 	unsigned predivide_shift, multiplier_shift;
 	unsigned predivide_select, predivisor, multiplier;

 	/* Trust the bootrom's idea of cpu frequency. */
 	scratch = ar5312_rst_reg_read(AR5312_SCRATCH);
 	if (scratch)
 		return scratch;

 	devid = ar5312_rst_reg_read(AR5312_REV);
 	devid = (devid & AR5312_REV_MAJ) >> AR5312_REV_MAJ_S;
 	if (devid == AR5312_REV_MAJ_AR2313) {
 		predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK;
 		predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT;
 		multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK;
 		multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT;
 		doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK;
 	} else { /* AR5312 and AR2312 */
 		predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK;
 		predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT;
 		multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK;
 		multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT;
 		doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK;
 	}

 	/*
 	 * Clocking is derived from a fixed 40MHz input clock.
 	 *
 	 *  cpu_freq = input_clock * MULT (where MULT is PLL multiplier)
 	 *  sys_freq = cpu_freq / 4	  (used for APB clock, serial,
 	 *				   flash, Timer, Watchdog Timer)
 	 *
 	 *  cnt_freq = cpu_freq / 2	  (use for CPU count/compare)
 	 *
 	 * So, for example, with a PLL multiplier of 5, we have
 	 *
 	 *  cpu_freq = 200MHz
 	 *  sys_freq = 50MHz
 	 *  cnt_freq = 100MHz
 	 *
 	 * We compute the CPU frequency, based on PLL settings.
 	 */

 	clock_ctl1 = ar5312_rst_reg_read(AR5312_CLOCKCTL1);
 	predivide_select = (clock_ctl1 & predivide_mask) >> predivide_shift;
 	predivisor = clockctl1_predivide_table[predivide_select];
 	multiplier = (clock_ctl1 & multiplier_mask) >> multiplier_shift;

 	if (clock_ctl1 & doubler_mask)
 		multiplier <<= 1;

 	return (40000000 / predivisor) * multiplier;
 }

 static inline unsigned ar5312_sys_frequency(void)
 {
 	return ar5312_cpu_frequency() / 4;
 }

 void __init ar5312_plat_time_init(void)
 {
 	mips_hpt_frequency = ar5312_cpu_frequency() / 2;
 }

 void __init ar5312_plat_mem_setup(void)
 {
 	void __iomem *sdram_base;
 	u32 memsize, memcfg, bank0_ac, bank1_ac;
 	u32 devid;

 	/* Detect memory size */
 	sdram_base = ioremap(AR5312_SDRAMCTL_BASE,
 				     AR5312_SDRAMCTL_SIZE);
 	memcfg = __raw_readl(sdram_base + AR5312_MEM_CFG1);
 	bank0_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC0);
 	bank1_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC1);
 	memsize = (bank0_ac ? (1 << (bank0_ac + 1)) : 0) +
 		  (bank1_ac ? (1 << (bank1_ac + 1)) : 0);
 	memsize <<= 20;
 	add_memory_region(0, memsize, BOOT_MEM_RAM);
 	iounmap(sdram_base);

 	ar5312_rst_base = ioremap(AR5312_RST_BASE, AR5312_RST_SIZE);

 	devid = ar5312_rst_reg_read(AR5312_REV);
 	devid >>= AR5312_REV_WMAC_MIN_S;
 	devid &= AR5312_REV_CHIP;
 	ath25_board.devid = (u16)devid;

 	/* Clear any lingering AHB errors */
 	ar5312_rst_reg_read(AR5312_PROCADDR);
 	ar5312_rst_reg_read(AR5312_DMAADDR);
 	ar5312_rst_reg_write(AR5312_WDT_CTRL, AR5312_WDT_CTRL_IGNORE);

 	_machine_restart = ar5312_restart;
 }

 void __init ar5312_arch_init(void)
 {
 	unsigned irq = irq_create_mapping(ar5312_misc_irq_domain,
 					  AR5312_MISC_IRQ_UART0);

 	ath25_serial_setup(AR5312_UART0_BASE, irq, ar5312_sys_frequency());
 }
	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
	* Copyright (C) 2006 FON Technology, SL.
	* Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
	* Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
	* Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com>
	*/

	/*
	* Platform devices for Atheros AR5312 SoCs
	*/

	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/bitops.h>
	#include <linux/irqdomain.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/mtd/physmap.h>
	#include <linux/reboot.h>
	#include <asm/bootinfo.h>
	#include <asm/reboot.h>
	#include <asm/time.h>

	#include <ath25_platform.h>

	#include "devices.h"
	#include "ar5312.h"
	#include "ar5312_regs.h"

	static void __iomem *ar5312_rst_base;
	static struct irq_domain *ar5312_misc_irq_domain;

	static inline u32 ar5312_rst_reg_read(u32 reg)
	{
	return __raw_readl(ar5312_rst_base + reg);
	}

	static inline void ar5312_rst_reg_write(u32 reg, u32 val)
	{
	__raw_writel(val, ar5312_rst_base + reg);
	}

	static inline void ar5312_rst_reg_mask(u32 reg, u32 mask, u32 val)
	{
	u32 ret = ar5312_rst_reg_read(reg);

	ret &= ~mask;
	ret \|= val;
	ar5312_rst_reg_write(reg, ret);
	}

	static irqreturn_t ar5312_ahb_err_handler(int cpl, void *dev_id)
	{
	u32 proc1 = ar5312_rst_reg_read(AR5312_PROC1);
	u32 proc_addr = ar5312_rst_reg_read(AR5312_PROCADDR); /* clears error */
	u32 dma1 = ar5312_rst_reg_read(AR5312_DMA1);
	u32 dma_addr = ar5312_rst_reg_read(AR5312_DMAADDR); /* clears error */

	pr_emerg("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n",
	proc_addr, proc1, dma_addr, dma1);

	machine_restart("AHB error"); /* Catastrophic failure */
	return IRQ_HANDLED;
	}

	static void ar5312_misc_irq_handler(struct irq_desc *desc)
	{
	u32 pending = ar5312_rst_reg_read(AR5312_ISR) &
	ar5312_rst_reg_read(AR5312_IMR);
	unsigned nr, misc_irq = 0;

	if (pending) {
	struct irq_domain *domain = irq_desc_get_handler_data(desc);

	nr = __ffs(pending);
	misc_irq = irq_find_mapping(domain, nr);
	}

	if (misc_irq) {
	generic_handle_irq(misc_irq);
	if (nr == AR5312_MISC_IRQ_TIMER)
	ar5312_rst_reg_read(AR5312_TIMER);
	} else {
	spurious_interrupt();
	}
	}

	/* Enable the specified AR5312_MISC_IRQ interrupt */
	static void ar5312_misc_irq_unmask(struct irq_data *d)
	{
	ar5312_rst_reg_mask(AR5312_IMR, 0, BIT(d->hwirq));
	}

	/* Disable the specified AR5312_MISC_IRQ interrupt */
	static void ar5312_misc_irq_mask(struct irq_data *d)
	{
	ar5312_rst_reg_mask(AR5312_IMR, BIT(d->hwirq), 0);
	ar5312_rst_reg_read(AR5312_IMR); /* flush write buffer */
	}

	static struct irq_chip ar5312_misc_irq_chip = {
	.name = "ar5312-misc",
	.irq_unmask = ar5312_misc_irq_unmask,
	.irq_mask = ar5312_misc_irq_mask,
	};

	static int ar5312_misc_irq_map(struct irq_domain *d, unsigned irq,
	irq_hw_number_t hw)
	{
	irq_set_chip_and_handler(irq, &ar5312_misc_irq_chip, handle_level_irq);
	return 0;
	}

	static struct irq_domain_ops ar5312_misc_irq_domain_ops = {
	.map = ar5312_misc_irq_map,
	};

	static void ar5312_irq_dispatch(void)
	{
	u32 pending = read_c0_status() & read_c0_cause();

	if (pending & CAUSEF_IP2)
	do_IRQ(AR5312_IRQ_WLAN0);
	else if (pending & CAUSEF_IP5)
	do_IRQ(AR5312_IRQ_WLAN1);
	else if (pending & CAUSEF_IP6)
	do_IRQ(AR5312_IRQ_MISC);
	else if (pending & CAUSEF_IP7)
	do_IRQ(ATH25_IRQ_CPU_CLOCK);
	else
	spurious_interrupt();
	}

	void __init ar5312_arch_init_irq(void)
	{
	struct irq_domain *domain;
	unsigned irq;

	ath25_irq_dispatch = ar5312_irq_dispatch;

	domain = irq_domain_add_linear(NULL, AR5312_MISC_IRQ_COUNT,
	&ar5312_misc_irq_domain_ops, NULL);
	if (!domain)
	panic("Failed to add IRQ domain");

	irq = irq_create_mapping(domain, AR5312_MISC_IRQ_AHB_PROC);
	if (request_irq(irq, ar5312_ahb_err_handler, 0, "ar5312-ahb-error",
	NULL))
	pr_err("Failed to register ar5312-ahb-error interrupt\n");

	irq_set_chained_handler_and_data(AR5312_IRQ_MISC,
	ar5312_misc_irq_handler, domain);

	ar5312_misc_irq_domain = domain;
	}

	static struct physmap_flash_data ar5312_flash_data = {
	.width = 2,
	};

	static struct resource ar5312_flash_resource = {
	.start = AR5312_FLASH_BASE,
	.end = AR5312_FLASH_BASE + AR5312_FLASH_SIZE - 1,
	.flags = IORESOURCE_MEM,
	};

	static struct platform_device ar5312_physmap_flash = {
	.name = "physmap-flash",
	.id = 0,
	.dev.platform_data = &ar5312_flash_data,
	.resource = &ar5312_flash_resource,
	.num_resources = 1,
	};

	static void __init ar5312_flash_init(void)
	{
	void __iomem *flashctl_base;
	u32 ctl;

	flashctl_base = ioremap(AR5312_FLASHCTL_BASE,
	AR5312_FLASHCTL_SIZE);

	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0);
	ctl &= AR5312_FLASHCTL_MW;

	/* fixup flash width */
	switch (ctl) {
	case AR5312_FLASHCTL_MW16:
	ar5312_flash_data.width = 2;
	break;
	case AR5312_FLASHCTL_MW8:
	default:
	ar5312_flash_data.width = 1;
	break;
	}

	/*
	* Configure flash bank 0.
	* Assume 8M window size. Flash will be aliased if it's smaller
	*/
	ctl \|= AR5312_FLASHCTL_E \| AR5312_FLASHCTL_AC_8M \| AR5312_FLASHCTL_RBLE;
	ctl \|= 0x01 << AR5312_FLASHCTL_IDCY_S;
	ctl \|= 0x07 << AR5312_FLASHCTL_WST1_S;
	ctl \|= 0x07 << AR5312_FLASHCTL_WST2_S;
	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL0);

	/* Disable other flash banks */
	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL1);
	ctl &= ~(AR5312_FLASHCTL_E \| AR5312_FLASHCTL_AC);
	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL1);
	ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL2);
	ctl &= ~(AR5312_FLASHCTL_E \| AR5312_FLASHCTL_AC);
	__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL2);

	iounmap(flashctl_base);
	}

	void __init ar5312_init_devices(void)
	{
	struct ath25_boarddata *config;

	ar5312_flash_init();

	/* Locate board/radio config data */
	ath25_find_config(AR5312_FLASH_BASE, AR5312_FLASH_SIZE);
	config = ath25_board.config;

	/* AR2313 has CPU minor rev. 10 */
	if ((current_cpu_data.processor_id & 0xff) == 0x0a)
	ath25_soc = ATH25_SOC_AR2313;

	/* AR2312 shares the same Silicon ID as AR5312 */
	else if (config->flags & BD_ISCASPER)
	ath25_soc = ATH25_SOC_AR2312;

	/* Everything else is probably AR5312 or compatible */
	else
	ath25_soc = ATH25_SOC_AR5312;

	platform_device_register(&ar5312_physmap_flash);

	switch (ath25_soc) {
	case ATH25_SOC_AR5312:
	if (!ath25_board.radio)
	return;

	if (!(config->flags & BD_WLAN0))
	break;

	ath25_add_wmac(0, AR5312_WLAN0_BASE, AR5312_IRQ_WLAN0);
	break;
	case ATH25_SOC_AR2312:
	case ATH25_SOC_AR2313:
	if (!ath25_board.radio)
	return;
	break;
	default:
	break;
	}

	if (config->flags & BD_WLAN1)
	ath25_add_wmac(1, AR5312_WLAN1_BASE, AR5312_IRQ_WLAN1);
	}

	static void ar5312_restart(char *command)
	{
	/* reset the system */
	local_irq_disable();
	while (1)
	ar5312_rst_reg_write(AR5312_RESET, AR5312_RESET_SYSTEM);
	}

	/*
	* This table is indexed by bits 5..4 of the CLOCKCTL1 register
	* to determine the predevisor value.
	*/
	static unsigned clockctl1_predivide_table[4] __initdata = { 1, 2, 4, 5 };

	static unsigned __init ar5312_cpu_frequency(void)
	{
	u32 scratch, devid, clock_ctl1;
	u32 predivide_mask, multiplier_mask, doubler_mask;
	unsigned predivide_shift, multiplier_shift;
	unsigned predivide_select, predivisor, multiplier;

	/* Trust the bootrom's idea of cpu frequency. */
	scratch = ar5312_rst_reg_read(AR5312_SCRATCH);
	if (scratch)
	return scratch;

	devid = ar5312_rst_reg_read(AR5312_REV);
	devid = (devid & AR5312_REV_MAJ) >> AR5312_REV_MAJ_S;
	if (devid == AR5312_REV_MAJ_AR2313) {
	predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK;
	predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT;
	multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK;
	multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT;
	doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK;
	} else { /* AR5312 and AR2312 */
	predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK;
	predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT;
	multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK;
	multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT;
	doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK;
	}

	/*
	* Clocking is derived from a fixed 40MHz input clock.
	*
	* cpu_freq = input_clock * MULT (where MULT is PLL multiplier)
	* sys_freq = cpu_freq / 4 (used for APB clock, serial,
	* flash, Timer, Watchdog Timer)
	*
	* cnt_freq = cpu_freq / 2 (use for CPU count/compare)
	*
	* So, for example, with a PLL multiplier of 5, we have
	*
	* cpu_freq = 200MHz
	* sys_freq = 50MHz
	* cnt_freq = 100MHz
	*
	* We compute the CPU frequency, based on PLL settings.
	*/

	clock_ctl1 = ar5312_rst_reg_read(AR5312_CLOCKCTL1);
	predivide_select = (clock_ctl1 & predivide_mask) >> predivide_shift;
	predivisor = clockctl1_predivide_table[predivide_select];
	multiplier = (clock_ctl1 & multiplier_mask) >> multiplier_shift;

	if (clock_ctl1 & doubler_mask)
	multiplier <<= 1;

	return (40000000 / predivisor) * multiplier;
	}

	static inline unsigned ar5312_sys_frequency(void)
	{
	return ar5312_cpu_frequency() / 4;
	}

	void __init ar5312_plat_time_init(void)
	{
	mips_hpt_frequency = ar5312_cpu_frequency() / 2;
	}

	void __init ar5312_plat_mem_setup(void)
	{
	void __iomem *sdram_base;
	u32 memsize, memcfg, bank0_ac, bank1_ac;
	u32 devid;

	/* Detect memory size */
	sdram_base = ioremap(AR5312_SDRAMCTL_BASE,
	AR5312_SDRAMCTL_SIZE);
	memcfg = __raw_readl(sdram_base + AR5312_MEM_CFG1);
	bank0_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC0);
	bank1_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC1);
	memsize = (bank0_ac ? (1 << (bank0_ac + 1)) : 0) +
	(bank1_ac ? (1 << (bank1_ac + 1)) : 0);
	memsize <<= 20;
	add_memory_region(0, memsize, BOOT_MEM_RAM);
	iounmap(sdram_base);

	ar5312_rst_base = ioremap(AR5312_RST_BASE, AR5312_RST_SIZE);

	devid = ar5312_rst_reg_read(AR5312_REV);
	devid >>= AR5312_REV_WMAC_MIN_S;
	devid &= AR5312_REV_CHIP;
	ath25_board.devid = (u16)devid;

	/* Clear any lingering AHB errors */
	ar5312_rst_reg_read(AR5312_PROCADDR);
	ar5312_rst_reg_read(AR5312_DMAADDR);
	ar5312_rst_reg_write(AR5312_WDT_CTRL, AR5312_WDT_CTRL_IGNORE);

	_machine_restart = ar5312_restart;
	}

	void __init ar5312_arch_init(void)
	{
	unsigned irq = irq_create_mapping(ar5312_misc_irq_domain,
	AR5312_MISC_IRQ_UART0);

	ath25_serial_setup(AR5312_UART0_BASE, irq, ar5312_sys_frequency());
	}