drivers/bcma/driver_mips.c - linux - Git at Google

 /*
  * Broadcom specific AMBA
  * Broadcom MIPS32 74K core driver
  *
  * Copyright 2009, Broadcom Corporation
  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
  * Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
  * Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */

 #include "bcma_private.h"

 #include <linux/bcma/bcma.h>

 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/serial_reg.h>
 #include <linux/time.h>

 /* The 47162a0 hangs when reading MIPS DMP registers registers */
 static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
 {
 	return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
 	       dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
 }

 /* The 5357b0 hangs when reading USB20H DMP registers */
 static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
 {
 	return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 ||
 		dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
 	       dev->bus->chipinfo.pkg == 11 &&
 	       dev->id.id == BCMA_CORE_USB20_HOST;
 }

 static inline u32 mips_read32(struct bcma_drv_mips *mcore,
 			      u16 offset)
 {
 	return bcma_read32(mcore->core, offset);
 }

 static inline void mips_write32(struct bcma_drv_mips *mcore,
 				u16 offset,
 				u32 value)
 {
 	bcma_write32(mcore->core, offset, value);
 }

 static const u32 ipsflag_irq_mask[] = {
 	0,
 	BCMA_MIPS_IPSFLAG_IRQ1,
 	BCMA_MIPS_IPSFLAG_IRQ2,
 	BCMA_MIPS_IPSFLAG_IRQ3,
 	BCMA_MIPS_IPSFLAG_IRQ4,
 };

 static const u32 ipsflag_irq_shift[] = {
 	0,
 	BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
 	BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
 	BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
 	BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
 };

 static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
 {
 	u32 flag;

 	if (bcma_core_mips_bcm47162a0_quirk(dev))
 		return dev->core_index;
 	if (bcma_core_mips_bcm5357b0_quirk(dev))
 		return dev->core_index;
 	flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);

 	return flag & 0x1F;
 }

 /* Get the MIPS IRQ assignment for a specified device.
  * If unassigned, 0 is returned.
  */
 unsigned int bcma_core_mips_irq(struct bcma_device *dev)
 {
 	struct bcma_device *mdev = dev->bus->drv_mips.core;
 	u32 irqflag;
 	unsigned int irq;

 	irqflag = bcma_core_mips_irqflag(dev);

 	for (irq = 1; irq <= 4; irq++)
 		if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
 		    (1 << irqflag))
 			return irq;

 	return 0;
 }
 EXPORT_SYMBOL(bcma_core_mips_irq);

 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
 {
 	unsigned int oldirq = bcma_core_mips_irq(dev);
 	struct bcma_bus *bus = dev->bus;
 	struct bcma_device *mdev = bus->drv_mips.core;
 	u32 irqflag;

 	irqflag = bcma_core_mips_irqflag(dev);
 	BUG_ON(oldirq == 6);

 	dev->irq = irq + 2;

 	/* clear the old irq */
 	if (oldirq == 0)
 		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 			    bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
 			    ~(1 << irqflag));
 	else
 		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);

 	/* assign the new one */
 	if (irq == 0) {
 		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 			    bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
 			    (1 << irqflag));
 	} else {
 		u32 oldirqflag = bcma_read32(mdev,
 					     BCMA_MIPS_MIPS74K_INTMASK(irq));
 		if (oldirqflag) {
 			struct bcma_device *core;

 			/* backplane irq line is in use, find out who uses
 			 * it and set user to irq 0
 			 */
 			list_for_each_entry(core, &bus->cores, list) {
 				if ((1 << bcma_core_mips_irqflag(core)) ==
 				    oldirqflag) {
 					bcma_core_mips_set_irq(core, 0);
 					break;
 				}
 			}
 		}
 		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
 			     1 << irqflag);
 	}

 	bcma_info(bus, "set_irq: core 0x%04x, irq %d => %d\n",
 		  dev->id.id, oldirq + 2, irq + 2);
 }

 static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
 {
 	int i;
 	static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
 	printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
 	for (i = 0; i <= 6; i++)
 		printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
 	printk("\n");
 }

 static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
 {
 	struct bcma_device *core;

 	list_for_each_entry(core, &bus->cores, list) {
 		bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
 	}
 }

 u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
 {
 	struct bcma_bus *bus = mcore->core->bus;

 	if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
 		return bcma_pmu_get_cpu_clock(&bus->drv_cc);

 	bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
 	return 0;
 }
 EXPORT_SYMBOL(bcma_cpu_clock);

 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
 {
 	struct bcma_bus *bus = mcore->core->bus;
 	struct bcma_drv_cc *cc = &bus->drv_cc;

 	switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
 	case BCMA_CC_FLASHT_STSER:
 	case BCMA_CC_FLASHT_ATSER:
 		bcma_debug(bus, "Found serial flash\n");
 		bcma_sflash_init(cc);
 		break;
 	case BCMA_CC_FLASHT_PARA:
 		bcma_debug(bus, "Found parallel flash\n");
 		cc->pflash.present = true;
 		cc->pflash.window = BCMA_SOC_FLASH2;
 		cc->pflash.window_size = BCMA_SOC_FLASH2_SZ;

 		if ((bcma_read32(cc->core, BCMA_CC_FLASH_CFG) &
 		     BCMA_CC_FLASH_CFG_DS) == 0)
 			cc->pflash.buswidth = 1;
 		else
 			cc->pflash.buswidth = 2;
 		break;
 	default:
 		bcma_err(bus, "Flash type not supported\n");
 	}

 	if (cc->core->id.rev == 38 ||
 	    bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
 		if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
 			bcma_debug(bus, "Found NAND flash\n");
 			bcma_nflash_init(cc);
 		}
 	}
 }

 void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
 {
 	struct bcma_bus *bus = mcore->core->bus;

 	if (mcore->early_setup_done)
 		return;

 	bcma_chipco_serial_init(&bus->drv_cc);
 	bcma_core_mips_flash_detect(mcore);

 	mcore->early_setup_done = true;
 }

 void bcma_core_mips_init(struct bcma_drv_mips *mcore)
 {
 	struct bcma_bus *bus;
 	struct bcma_device *core;
 	bus = mcore->core->bus;

 	if (mcore->setup_done)
 		return;

 	bcma_info(bus, "Initializing MIPS core...\n");

 	bcma_core_mips_early_init(mcore);

 	mcore->assigned_irqs = 1;

 	/* Assign IRQs to all cores on the bus */
 	list_for_each_entry(core, &bus->cores, list) {
 		int mips_irq;
 		if (core->irq)
 			continue;

 		mips_irq = bcma_core_mips_irq(core);
 		if (mips_irq > 4)
 			core->irq = 0;
 		else
 			core->irq = mips_irq + 2;
 		if (core->irq > 5)
 			continue;
 		switch (core->id.id) {
 		case BCMA_CORE_PCI:
 		case BCMA_CORE_PCIE:
 		case BCMA_CORE_ETHERNET:
 		case BCMA_CORE_ETHERNET_GBIT:
 		case BCMA_CORE_MAC_GBIT:
 		case BCMA_CORE_80211:
 		case BCMA_CORE_USB20_HOST:
 			/* These devices get their own IRQ line if available,
 			 * the rest goes on IRQ0
 			 */
 			if (mcore->assigned_irqs <= 4)
 				bcma_core_mips_set_irq(core,
 						       mcore->assigned_irqs++);
 			break;
 		}
 	}
 	bcma_info(bus, "IRQ reconfiguration done\n");
 	bcma_core_mips_dump_irq(bus);

 	mcore->setup_done = true;
 }
	/*
	* Broadcom specific AMBA
	* Broadcom MIPS32 74K core driver
	*
	* Copyright 2009, Broadcom Corporation
	* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
	* Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
	* Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
	*
	* Licensed under the GNU/GPL. See COPYING for details.
	*/

	#include "bcma_private.h"

	#include <linux/bcma/bcma.h>

	#include <linux/serial.h>
	#include <linux/serial_core.h>
	#include <linux/serial_reg.h>
	#include <linux/time.h>

	/* The 47162a0 hangs when reading MIPS DMP registers registers */
	static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
	{
	return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
	dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
	}

	/* The 5357b0 hangs when reading USB20H DMP registers */
	static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
	{
	return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 \|\|
	dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
	dev->bus->chipinfo.pkg == 11 &&
	dev->id.id == BCMA_CORE_USB20_HOST;
	}

	static inline u32 mips_read32(struct bcma_drv_mips *mcore,
	u16 offset)
	{
	return bcma_read32(mcore->core, offset);
	}

	static inline void mips_write32(struct bcma_drv_mips *mcore,
	u16 offset,
	u32 value)
	{
	bcma_write32(mcore->core, offset, value);
	}

	static const u32 ipsflag_irq_mask[] = {
	0,
	BCMA_MIPS_IPSFLAG_IRQ1,
	BCMA_MIPS_IPSFLAG_IRQ2,
	BCMA_MIPS_IPSFLAG_IRQ3,
	BCMA_MIPS_IPSFLAG_IRQ4,
	};

	static const u32 ipsflag_irq_shift[] = {
	0,
	BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
	BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
	BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
	BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
	};

	static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
	{
	u32 flag;

	if (bcma_core_mips_bcm47162a0_quirk(dev))
	return dev->core_index;
	if (bcma_core_mips_bcm5357b0_quirk(dev))
	return dev->core_index;
	flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);

	return flag & 0x1F;
	}

	/* Get the MIPS IRQ assignment for a specified device.
	* If unassigned, 0 is returned.
	*/
	unsigned int bcma_core_mips_irq(struct bcma_device *dev)
	{
	struct bcma_device *mdev = dev->bus->drv_mips.core;
	u32 irqflag;
	unsigned int irq;

	irqflag = bcma_core_mips_irqflag(dev);

	for (irq = 1; irq <= 4; irq++)
	if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
	(1 << irqflag))
	return irq;

	return 0;
	}
	EXPORT_SYMBOL(bcma_core_mips_irq);

	static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
	{
	unsigned int oldirq = bcma_core_mips_irq(dev);
	struct bcma_bus *bus = dev->bus;
	struct bcma_device *mdev = bus->drv_mips.core;
	u32 irqflag;

	irqflag = bcma_core_mips_irqflag(dev);
	BUG_ON(oldirq == 6);

	dev->irq = irq + 2;

	/* clear the old irq */
	if (oldirq == 0)
	bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
	bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
	~(1 << irqflag));
	else
	bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);

	/* assign the new one */
	if (irq == 0) {
	bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
	bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) \|
	(1 << irqflag));
	} else {
	u32 oldirqflag = bcma_read32(mdev,
	BCMA_MIPS_MIPS74K_INTMASK(irq));
	if (oldirqflag) {
	struct bcma_device *core;

	/* backplane irq line is in use, find out who uses
	* it and set user to irq 0
	*/
	list_for_each_entry(core, &bus->cores, list) {
	if ((1 << bcma_core_mips_irqflag(core)) ==
	oldirqflag) {
	bcma_core_mips_set_irq(core, 0);
	break;
	}
	}
	}
	bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
	1 << irqflag);
	}

	bcma_info(bus, "set_irq: core 0x%04x, irq %d => %d\n",
	dev->id.id, oldirq + 2, irq + 2);
	}

	static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
	{
	int i;
	static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
	printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
	for (i = 0; i <= 6; i++)
	printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
	printk("\n");
	}

	static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
	{
	struct bcma_device *core;

	list_for_each_entry(core, &bus->cores, list) {
	bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
	}
	}

	u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
	{
	struct bcma_bus *bus = mcore->core->bus;

	if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
	return bcma_pmu_get_cpu_clock(&bus->drv_cc);

	bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
	return 0;
	}
	EXPORT_SYMBOL(bcma_cpu_clock);

	static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
	{
	struct bcma_bus *bus = mcore->core->bus;
	struct bcma_drv_cc *cc = &bus->drv_cc;

	switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
	case BCMA_CC_FLASHT_STSER:
	case BCMA_CC_FLASHT_ATSER:
	bcma_debug(bus, "Found serial flash\n");
	bcma_sflash_init(cc);
	break;
	case BCMA_CC_FLASHT_PARA:
	bcma_debug(bus, "Found parallel flash\n");
	cc->pflash.present = true;
	cc->pflash.window = BCMA_SOC_FLASH2;
	cc->pflash.window_size = BCMA_SOC_FLASH2_SZ;

	if ((bcma_read32(cc->core, BCMA_CC_FLASH_CFG) &
	BCMA_CC_FLASH_CFG_DS) == 0)
	cc->pflash.buswidth = 1;
	else
	cc->pflash.buswidth = 2;
	break;
	default:
	bcma_err(bus, "Flash type not supported\n");
	}

	if (cc->core->id.rev == 38 \|\|
	bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
	if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
	bcma_debug(bus, "Found NAND flash\n");
	bcma_nflash_init(cc);
	}
	}
	}

	void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
	{
	struct bcma_bus *bus = mcore->core->bus;

	if (mcore->early_setup_done)
	return;

	bcma_chipco_serial_init(&bus->drv_cc);
	bcma_core_mips_flash_detect(mcore);

	mcore->early_setup_done = true;
	}

	void bcma_core_mips_init(struct bcma_drv_mips *mcore)
	{
	struct bcma_bus *bus;
	struct bcma_device *core;
	bus = mcore->core->bus;

	if (mcore->setup_done)
	return;

	bcma_info(bus, "Initializing MIPS core...\n");

	bcma_core_mips_early_init(mcore);

	mcore->assigned_irqs = 1;

	/* Assign IRQs to all cores on the bus */
	list_for_each_entry(core, &bus->cores, list) {
	int mips_irq;
	if (core->irq)
	continue;

	mips_irq = bcma_core_mips_irq(core);
	if (mips_irq > 4)
	core->irq = 0;
	else
	core->irq = mips_irq + 2;
	if (core->irq > 5)
	continue;
	switch (core->id.id) {
	case BCMA_CORE_PCI:
	case BCMA_CORE_PCIE:
	case BCMA_CORE_ETHERNET:
	case BCMA_CORE_ETHERNET_GBIT:
	case BCMA_CORE_MAC_GBIT:
	case BCMA_CORE_80211:
	case BCMA_CORE_USB20_HOST:
	/* These devices get their own IRQ line if available,
	* the rest goes on IRQ0
	*/
	if (mcore->assigned_irqs <= 4)
	bcma_core_mips_set_irq(core,
	mcore->assigned_irqs++);
	break;
	}
	}
	bcma_info(bus, "IRQ reconfiguration done\n");
	bcma_core_mips_dump_irq(bus);

	mcore->setup_done = true;
	}