drivers/ssb/pcmcia.c - kernel/msm-4.9 - Gitiles

 /*
  * Sonics Silicon Backplane
  * PCMCIA-Hostbus related functions
  *
  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2007 Michael Buesch <mb@bu3sch.de>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */

 #include <linux/ssb/ssb.h>
 #include <linux/delay.h>
 #include <linux/io.h>

 #include <pcmcia/cs_types.h>
 #include <pcmcia/cs.h>
 #include <pcmcia/cistpl.h>
 #include <pcmcia/ciscode.h>
 #include <pcmcia/ds.h>
 #include <pcmcia/cisreg.h>

 #include "ssb_private.h"


 /* Define the following to 1 to enable a printk on each coreswitch. */
 #define SSB_VERBOSE_PCMCIACORESWITCH_DEBUG		0


 int ssb_pcmcia_switch_coreidx(struct ssb_bus *bus,
 			      u8 coreidx)
 {
 	struct pcmcia_device *pdev = bus->host_pcmcia;
 	int err;
 	int attempts = 0;
 	u32 cur_core;
 	conf_reg_t reg;
 	u32 addr;
 	u32 read_addr;

 	addr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
 	while (1) {
 		reg.Action = CS_WRITE;
 		reg.Offset = 0x2E;
 		reg.Value = (addr & 0x0000F000) >> 12;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;
 		reg.Offset = 0x30;
 		reg.Value = (addr & 0x00FF0000) >> 16;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;
 		reg.Offset = 0x32;
 		reg.Value = (addr & 0xFF000000) >> 24;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;

 		read_addr = 0;

 		reg.Action = CS_READ;
 		reg.Offset = 0x2E;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;
 		read_addr |= ((u32)(reg.Value & 0x0F)) << 12;
 		reg.Offset = 0x30;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;
 		read_addr |= ((u32)reg.Value) << 16;
 		reg.Offset = 0x32;
 		err = pcmcia_access_configuration_register(pdev, &reg);
 		if (err != CS_SUCCESS)
 			goto error;
 		read_addr |= ((u32)reg.Value) << 24;

 		cur_core = (read_addr - SSB_ENUM_BASE) / SSB_CORE_SIZE;
 		if (cur_core == coreidx)
 			break;

 		if (attempts++ > SSB_BAR0_MAX_RETRIES)
 			goto error;
 		udelay(10);
 	}

 	return 0;
 error:
 	ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
 	return -ENODEV;
 }

 int ssb_pcmcia_switch_core(struct ssb_bus *bus,
 			   struct ssb_device *dev)
 {
 	int err;

 #if SSB_VERBOSE_PCMCIACORESWITCH_DEBUG
 	ssb_printk(KERN_INFO PFX
 		   "Switching to %s core, index %d\n",
 		   ssb_core_name(dev->id.coreid),
 		   dev->core_index);
 #endif

 	err = ssb_pcmcia_switch_coreidx(bus, dev->core_index);
 	if (!err)
 		bus->mapped_device = dev;

 	return err;
 }

 int ssb_pcmcia_switch_segment(struct ssb_bus *bus, u8 seg)
 {
 	int attempts = 0;
 	conf_reg_t reg;
 	int res;

 	SSB_WARN_ON((seg != 0) && (seg != 1));
 	reg.Offset = 0x34;
 	reg.Function = 0;
 	while (1) {
 		reg.Action = CS_WRITE;
 		reg.Value = seg;
 		res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
 		if (unlikely(res != CS_SUCCESS))
 			goto error;
 		reg.Value = 0xFF;
 		reg.Action = CS_READ;
 		res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
 		if (unlikely(res != CS_SUCCESS))
 			goto error;

 		if (reg.Value == seg)
 			break;

 		if (unlikely(attempts++ > SSB_BAR0_MAX_RETRIES))
 			goto error;
 		udelay(10);
 	}
 	bus->mapped_pcmcia_seg = seg;

 	return 0;
 error:
 	ssb_printk(KERN_ERR PFX "Failed to switch pcmcia segment\n");
 	return -ENODEV;
 }

 static int select_core_and_segment(struct ssb_device *dev,
 				   u16 *offset)
 {
 	struct ssb_bus *bus = dev->bus;
 	int err;
 	u8 need_segment;

 	if (*offset >= 0x800) {
 		*offset -= 0x800;
 		need_segment = 1;
 	} else
 		need_segment = 0;

 	if (unlikely(dev != bus->mapped_device)) {
 		err = ssb_pcmcia_switch_core(bus, dev);
 		if (unlikely(err))
 			return err;
 	}
 	if (unlikely(need_segment != bus->mapped_pcmcia_seg)) {
 		err = ssb_pcmcia_switch_segment(bus, need_segment);
 		if (unlikely(err))
 			return err;
 	}

 	return 0;
 }

 static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
 {
 	struct ssb_bus *bus = dev->bus;
 	unsigned long flags;
 	int err;
 	u16 value = 0xFFFF;

 	spin_lock_irqsave(&bus->bar_lock, flags);
 	err = select_core_and_segment(dev, &offset);
 	if (likely(!err))
 		value = readw(bus->mmio + offset);
 	spin_unlock_irqrestore(&bus->bar_lock, flags);

 	return value;
 }

 static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
 {
 	struct ssb_bus *bus = dev->bus;
 	unsigned long flags;
 	int err;
 	u32 lo = 0xFFFFFFFF, hi = 0xFFFFFFFF;

 	spin_lock_irqsave(&bus->bar_lock, flags);
 	err = select_core_and_segment(dev, &offset);
 	if (likely(!err)) {
 		lo = readw(bus->mmio + offset);
 		hi = readw(bus->mmio + offset + 2);
 	}
 	spin_unlock_irqrestore(&bus->bar_lock, flags);

 	return (lo | (hi << 16));
 }

 static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
 {
 	struct ssb_bus *bus = dev->bus;
 	unsigned long flags;
 	int err;

 	spin_lock_irqsave(&bus->bar_lock, flags);
 	err = select_core_and_segment(dev, &offset);
 	if (likely(!err))
 		writew(value, bus->mmio + offset);
 	mmiowb();
 	spin_unlock_irqrestore(&bus->bar_lock, flags);
 }

 static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
 {
 	struct ssb_bus *bus = dev->bus;
 	unsigned long flags;
 	int err;

 	spin_lock_irqsave(&bus->bar_lock, flags);
 	err = select_core_and_segment(dev, &offset);
 	if (likely(!err)) {
 		writew((value & 0x0000FFFF), bus->mmio + offset);
 		writew(((value & 0xFFFF0000) >> 16), bus->mmio + offset + 2);
 	}
 	mmiowb();
 	spin_unlock_irqrestore(&bus->bar_lock, flags);
 }

 /* Not "static", as it's used in main.c */
 const struct ssb_bus_ops ssb_pcmcia_ops = {
 	.read16		= ssb_pcmcia_read16,
 	.read32		= ssb_pcmcia_read32,
 	.write16	= ssb_pcmcia_write16,
 	.write32	= ssb_pcmcia_write32,
 };

 #include <linux/etherdevice.h>
 int ssb_pcmcia_get_invariants(struct ssb_bus *bus,
 			      struct ssb_init_invariants *iv)
 {
 	//TODO
 	random_ether_addr(iv->sprom.il0mac);
 	return 0;
 }

 int ssb_pcmcia_init(struct ssb_bus *bus)
 {
 	conf_reg_t reg;
 	int err;

 	if (bus->bustype != SSB_BUSTYPE_PCMCIA)
 		return 0;

 	/* Switch segment to a known state and sync
 	 * bus->mapped_pcmcia_seg with hardware state. */
 	ssb_pcmcia_switch_segment(bus, 0);

 	/* Init IRQ routing */
 	reg.Action = CS_READ;
 	reg.Function = 0;
 	if (bus->chip_id == 0x4306)
 		reg.Offset = 0x00;
 	else
 		reg.Offset = 0x80;
 	err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
 	if (err != CS_SUCCESS)
 		goto error;
 	reg.Action = CS_WRITE;
 	reg.Value |= 0x04 | 0x01;
 	err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
 	if (err != CS_SUCCESS)
 		goto error;

 	return 0;
 error:
 	return -ENODEV;
 }
	/*
	* Sonics Silicon Backplane
	* PCMCIA-Hostbus related functions
	*
	* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
	* Copyright 2007 Michael Buesch <mb@bu3sch.de>
	*
	* Licensed under the GNU/GPL. See COPYING for details.
	*/

	#include <linux/ssb/ssb.h>
	#include <linux/delay.h>
	#include <linux/io.h>

	#include <pcmcia/cs_types.h>
	#include <pcmcia/cs.h>
	#include <pcmcia/cistpl.h>
	#include <pcmcia/ciscode.h>
	#include <pcmcia/ds.h>
	#include <pcmcia/cisreg.h>

	#include "ssb_private.h"


	/* Define the following to 1 to enable a printk on each coreswitch. */
	#define SSB_VERBOSE_PCMCIACORESWITCH_DEBUG 0


	int ssb_pcmcia_switch_coreidx(struct ssb_bus *bus,
	u8 coreidx)
	{
	struct pcmcia_device *pdev = bus->host_pcmcia;
	int err;
	int attempts = 0;
	u32 cur_core;
	conf_reg_t reg;
	u32 addr;
	u32 read_addr;

	addr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
	while (1) {
	reg.Action = CS_WRITE;
	reg.Offset = 0x2E;
	reg.Value = (addr & 0x0000F000) >> 12;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;
	reg.Offset = 0x30;
	reg.Value = (addr & 0x00FF0000) >> 16;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;
	reg.Offset = 0x32;
	reg.Value = (addr & 0xFF000000) >> 24;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;

	read_addr = 0;

	reg.Action = CS_READ;
	reg.Offset = 0x2E;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;
	read_addr \|= ((u32)(reg.Value & 0x0F)) << 12;
	reg.Offset = 0x30;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;
	read_addr \|= ((u32)reg.Value) << 16;
	reg.Offset = 0x32;
	err = pcmcia_access_configuration_register(pdev, &reg);
	if (err != CS_SUCCESS)
	goto error;
	read_addr \|= ((u32)reg.Value) << 24;

	cur_core = (read_addr - SSB_ENUM_BASE) / SSB_CORE_SIZE;
	if (cur_core == coreidx)
	break;

	if (attempts++ > SSB_BAR0_MAX_RETRIES)
	goto error;
	udelay(10);
	}

	return 0;
	error:
	ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
	return -ENODEV;
	}

	int ssb_pcmcia_switch_core(struct ssb_bus *bus,
	struct ssb_device *dev)
	{
	int err;

	#if SSB_VERBOSE_PCMCIACORESWITCH_DEBUG
	ssb_printk(KERN_INFO PFX
	"Switching to %s core, index %d\n",
	ssb_core_name(dev->id.coreid),
	dev->core_index);
	#endif

	err = ssb_pcmcia_switch_coreidx(bus, dev->core_index);
	if (!err)
	bus->mapped_device = dev;

	return err;
	}

	int ssb_pcmcia_switch_segment(struct ssb_bus *bus, u8 seg)
	{
	int attempts = 0;
	conf_reg_t reg;
	int res;

	SSB_WARN_ON((seg != 0) && (seg != 1));
	reg.Offset = 0x34;
	reg.Function = 0;
	while (1) {
	reg.Action = CS_WRITE;
	reg.Value = seg;
	res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
	if (unlikely(res != CS_SUCCESS))
	goto error;
	reg.Value = 0xFF;
	reg.Action = CS_READ;
	res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
	if (unlikely(res != CS_SUCCESS))
	goto error;

	if (reg.Value == seg)
	break;

	if (unlikely(attempts++ > SSB_BAR0_MAX_RETRIES))
	goto error;
	udelay(10);
	}
	bus->mapped_pcmcia_seg = seg;

	return 0;
	error:
	ssb_printk(KERN_ERR PFX "Failed to switch pcmcia segment\n");
	return -ENODEV;
	}

	static int select_core_and_segment(struct ssb_device *dev,
	u16 *offset)
	{
	struct ssb_bus *bus = dev->bus;
	int err;
	u8 need_segment;

	if (*offset >= 0x800) {
	*offset -= 0x800;
	need_segment = 1;
	} else
	need_segment = 0;

	if (unlikely(dev != bus->mapped_device)) {
	err = ssb_pcmcia_switch_core(bus, dev);
	if (unlikely(err))
	return err;
	}
	if (unlikely(need_segment != bus->mapped_pcmcia_seg)) {
	err = ssb_pcmcia_switch_segment(bus, need_segment);
	if (unlikely(err))
	return err;
	}

	return 0;
	}

	static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
	{
	struct ssb_bus *bus = dev->bus;
	unsigned long flags;
	int err;
	u16 value = 0xFFFF;

	spin_lock_irqsave(&bus->bar_lock, flags);
	err = select_core_and_segment(dev, &offset);
	if (likely(!err))
	value = readw(bus->mmio + offset);
	spin_unlock_irqrestore(&bus->bar_lock, flags);

	return value;
	}

	static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
	{
	struct ssb_bus *bus = dev->bus;
	unsigned long flags;
	int err;
	u32 lo = 0xFFFFFFFF, hi = 0xFFFFFFFF;

	spin_lock_irqsave(&bus->bar_lock, flags);
	err = select_core_and_segment(dev, &offset);
	if (likely(!err)) {
	lo = readw(bus->mmio + offset);
	hi = readw(bus->mmio + offset + 2);
	}
	spin_unlock_irqrestore(&bus->bar_lock, flags);

	return (lo \| (hi << 16));
	}

	static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
	{
	struct ssb_bus *bus = dev->bus;
	unsigned long flags;
	int err;

	spin_lock_irqsave(&bus->bar_lock, flags);
	err = select_core_and_segment(dev, &offset);
	if (likely(!err))
	writew(value, bus->mmio + offset);
	mmiowb();
	spin_unlock_irqrestore(&bus->bar_lock, flags);
	}

	static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
	{
	struct ssb_bus *bus = dev->bus;
	unsigned long flags;
	int err;

	spin_lock_irqsave(&bus->bar_lock, flags);
	err = select_core_and_segment(dev, &offset);
	if (likely(!err)) {
	writew((value & 0x0000FFFF), bus->mmio + offset);
	writew(((value & 0xFFFF0000) >> 16), bus->mmio + offset + 2);
	}
	mmiowb();
	spin_unlock_irqrestore(&bus->bar_lock, flags);
	}

	/* Not "static", as it's used in main.c */
	const struct ssb_bus_ops ssb_pcmcia_ops = {
	.read16 = ssb_pcmcia_read16,
	.read32 = ssb_pcmcia_read32,
	.write16 = ssb_pcmcia_write16,
	.write32 = ssb_pcmcia_write32,
	};

	#include <linux/etherdevice.h>
	int ssb_pcmcia_get_invariants(struct ssb_bus *bus,
	struct ssb_init_invariants *iv)
	{
	//TODO
	random_ether_addr(iv->sprom.il0mac);
	return 0;
	}

	int ssb_pcmcia_init(struct ssb_bus *bus)
	{
	conf_reg_t reg;
	int err;

	if (bus->bustype != SSB_BUSTYPE_PCMCIA)
	return 0;

	/* Switch segment to a known state and sync
	* bus->mapped_pcmcia_seg with hardware state. */
	ssb_pcmcia_switch_segment(bus, 0);

	/* Init IRQ routing */
	reg.Action = CS_READ;
	reg.Function = 0;
	if (bus->chip_id == 0x4306)
	reg.Offset = 0x00;
	else
	reg.Offset = 0x80;
	err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
	if (err != CS_SUCCESS)
	goto error;
	reg.Action = CS_WRITE;
	reg.Value \|= 0x04 \| 0x01;
	err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
	if (err != CS_SUCCESS)
	goto error;

	return 0;
	error:
	return -ENODEV;
	}