arch/parisc/kernel/pci.c - maze/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) 1997, 1998 Ralf Baechle
  * Copyright (C) 1999 SuSE GmbH
  * Copyright (C) 1999-2001 Hewlett-Packard Company
  * Copyright (C) 1999-2001 Grant Grundler
  */
 #include <linux/eisa.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/types.h>

 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/superio.h>

 #define DEBUG_RESOURCES 0
 #define DEBUG_CONFIG 0

 #if DEBUG_CONFIG
 # define DBGC(x...)	printk(KERN_DEBUG x)
 #else
 # define DBGC(x...)
 #endif


 #if DEBUG_RESOURCES
 #define DBG_RES(x...)	printk(KERN_DEBUG x)
 #else
 #define DBG_RES(x...)
 #endif

 /* To be used as: mdelay(pci_post_reset_delay);
  *
  * post_reset is the time the kernel should stall to prevent anyone from
  * accessing the PCI bus once #RESET is de-asserted.
  * PCI spec somewhere says 1 second but with multi-PCI bus systems,
  * this makes the boot time much longer than necessary.
  * 20ms seems to work for all the HP PCI implementations to date.
  *
  * #define pci_post_reset_delay 50
  */

 struct pci_port_ops *pci_port __read_mostly;
 struct pci_bios_ops *pci_bios __read_mostly;

 static int pci_hba_count __read_mostly;

 /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data.  */
 #define PCI_HBA_MAX 32
 static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;


 /********************************************************************
 **
 ** I/O port space support
 **
 *********************************************************************/

 /* EISA port numbers and PCI port numbers share the same interface.  Some
  * machines have both EISA and PCI adapters installed.  Rather than turn
  * pci_port into an array, we reserve bus 0 for EISA and call the EISA
  * routines if the access is to a port on bus 0.  We don't want to fix
  * EISA and ISA drivers which assume port space is <= 0xffff.
  */

 #ifdef CONFIG_EISA
 #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
 #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
 #else
 #define EISA_IN(size)
 #define EISA_OUT(size)
 #endif

 #define PCI_PORT_IN(type, size) \
 u##size in##type (int addr) \
 { \
 	int b = PCI_PORT_HBA(addr); \
 	EISA_IN(size); \
 	if (!parisc_pci_hba[b]) return (u##size) -1; \
 	return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
 } \
 EXPORT_SYMBOL(in##type);

 PCI_PORT_IN(b,  8)
 PCI_PORT_IN(w, 16)
 PCI_PORT_IN(l, 32)


 #define PCI_PORT_OUT(type, size) \
 void out##type (u##size d, int addr) \
 { \
 	int b = PCI_PORT_HBA(addr); \
 	EISA_OUT(size); \
 	if (!parisc_pci_hba[b]) return; \
 	pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
 } \
 EXPORT_SYMBOL(out##type);

 PCI_PORT_OUT(b,  8)
 PCI_PORT_OUT(w, 16)
 PCI_PORT_OUT(l, 32)


 /*
  * BIOS32 replacement.
  */
 static int __init pcibios_init(void)
 {
 	if (!pci_bios)
 		return -1;

 	if (pci_bios->init) {
 		pci_bios->init();
 	} else {
 		printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
 	}

 	/* Set the CLS for PCI as early as possible. */
 	pci_cache_line_size = pci_dfl_cache_line_size;

 	return 0;
 }


 /* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
 void pcibios_fixup_bus(struct pci_bus *bus)
 {
 	if (pci_bios->fixup_bus) {
 		pci_bios->fixup_bus(bus);
 	} else {
 		printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
 	}
 }


 char *pcibios_setup(char *str)
 {
 	return str;
 }

 /*
  * Called by pci_set_master() - a driver interface.
  *
  * Legacy PDC guarantees to set:
  *	Map Memory BAR's into PA IO space.
  *	Map Expansion ROM BAR into one common PA IO space per bus.
  *	Map IO BAR's into PCI IO space.
  *	Command (see below)
  *	Cache Line Size
  *	Latency Timer
  *	Interrupt Line
  *	PPB: secondary latency timer, io/mmio base/limit,
  *		bus numbers, bridge control
  *
  */
 void pcibios_set_master(struct pci_dev *dev)
 {
 	u8 lat;

 	/* If someone already mucked with this, don't touch it. */
 	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 	if (lat >= 16) return;

 	/*
 	** HP generally has fewer devices on the bus than other architectures.
 	** upper byte is PCI_LATENCY_TIMER.
 	*/
 	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
 			      (0x80 << 8) | pci_cache_line_size);
 }


 void __init pcibios_init_bus(struct pci_bus *bus)
 {
 	struct pci_dev *dev = bus->self;
 	unsigned short bridge_ctl;

 	/* We deal only with pci controllers and pci-pci bridges. */
 	if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 		return;

 	/* PCI-PCI bridge - set the cache line and default latency
 	   (32) for primary and secondary buses. */
 	pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);

 	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
 	bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
 	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
 }

 /* called by drivers/pci/setup-bus.c:pci_setup_bridge().  */
 void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
 		struct pci_bus_region *region, struct resource *res)
 {
 #ifdef CONFIG_64BIT
 	struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
 #endif

 	if (res->flags & IORESOURCE_IO) {
 		/*
 		** I/O space may see busnumbers here. Something
 		** in the form of 0xbbxxxx where bb is the bus num
 		** and xxxx is the I/O port space address.
 		** Remaining address translation are done in the
 		** PCI Host adapter specific code - ie dino_out8.
 		*/
 		region->start = PCI_PORT_ADDR(res->start);
 		region->end   = PCI_PORT_ADDR(res->end);
 	} else if (res->flags & IORESOURCE_MEM) {
 		/* Convert MMIO addr to PCI addr (undo global virtualization) */
 		region->start = PCI_BUS_ADDR(hba, res->start);
 		region->end   = PCI_BUS_ADDR(hba, res->end);
 	}

 	DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
 		dev->bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
 		region->start, region->end);
 }

 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			      struct pci_bus_region *region)
 {
 #ifdef CONFIG_64BIT
 	struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
 #endif

 	if (res->flags & IORESOURCE_MEM) {
 		res->start = PCI_HOST_ADDR(hba, region->start);
 		res->end = PCI_HOST_ADDR(hba, region->end);
 	}

 	if (res->flags & IORESOURCE_IO) {
 		res->start = region->start;
 		res->end = region->end;
 	}
 }

 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pcibios_resource_to_bus);
 EXPORT_SYMBOL(pcibios_bus_to_resource);
 #endif

 /*
  * pcibios align resources() is called every time generic PCI code
  * wants to generate a new address. The process of looking for
  * an available address, each candidate is first "aligned" and
  * then checked if the resource is available until a match is found.
  *
  * Since we are just checking candidates, don't use any fields other
  * than res->start.
  */
 void pcibios_align_resource(void *data, struct resource *res,
 				resource_size_t size, resource_size_t alignment)
 {
 	resource_size_t mask, align;

 	DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
 		pci_name(((struct pci_dev *) data)),
 		res->parent, res->start, res->end,
 		(int) res->flags, size, alignment);

 	/* If it's not IO, then it's gotta be MEM */
 	align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

 	/* Align to largest of MIN or input size */
 	mask = max(alignment, align) - 1;
 	res->start += mask;
 	res->start &= ~mask;

 	/* The caller updates the end field, we don't.  */
 }


 /*
  * A driver is enabling the device.  We make sure that all the appropriate
  * bits are set to allow the device to operate as the driver is expecting.
  * We enable the port IO and memory IO bits if the device has any BARs of
  * that type, and we enable the PERR and SERR bits unconditionally.
  * Drivers that do not need parity (eg graphics and possibly networking)
  * can clear these bits if they want.
  */
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	int err;
 	u16 cmd, old_cmd;

 	err = pci_enable_resources(dev, mask);
 	if (err < 0)
 		return err;

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;

 	cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);

 #if 0
 	/* If bridge/bus controller has FBB enabled, child must too. */
 	if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
 		cmd |= PCI_COMMAND_FAST_BACK;
 #endif

 	if (cmd != old_cmd) {
 		dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
 			old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
 	}
 	return 0;
 }


 /* PA-RISC specific */
 void pcibios_register_hba(struct pci_hba_data *hba)
 {
 	if (pci_hba_count >= PCI_HBA_MAX) {
 		printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
 		return;
 	}

 	parisc_pci_hba[pci_hba_count] = hba;
 	hba->hba_num = pci_hba_count++;
 }

 subsys_initcall(pcibios_init);
	/*
	* 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) 1997, 1998 Ralf Baechle
	* Copyright (C) 1999 SuSE GmbH
	* Copyright (C) 1999-2001 Hewlett-Packard Company
	* Copyright (C) 1999-2001 Grant Grundler
	*/
	#include <linux/eisa.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/types.h>

	#include <asm/io.h>
	#include <asm/system.h>
	#include <asm/superio.h>

	#define DEBUG_RESOURCES 0
	#define DEBUG_CONFIG 0

	#if DEBUG_CONFIG
	# define DBGC(x...) printk(KERN_DEBUG x)
	#else
	# define DBGC(x...)
	#endif


	#if DEBUG_RESOURCES
	#define DBG_RES(x...) printk(KERN_DEBUG x)
	#else
	#define DBG_RES(x...)
	#endif

	/* To be used as: mdelay(pci_post_reset_delay);
	*
	* post_reset is the time the kernel should stall to prevent anyone from
	* accessing the PCI bus once #RESET is de-asserted.
	* PCI spec somewhere says 1 second but with multi-PCI bus systems,
	* this makes the boot time much longer than necessary.
	* 20ms seems to work for all the HP PCI implementations to date.
	*
	* #define pci_post_reset_delay 50
	*/

	struct pci_port_ops *pci_port __read_mostly;
	struct pci_bios_ops *pci_bios __read_mostly;

	static int pci_hba_count __read_mostly;

	/* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */
	#define PCI_HBA_MAX 32
	static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;


	/********************************************************************
	**
	** I/O port space support
	**
	*********************************************************************/

	/* EISA port numbers and PCI port numbers share the same interface. Some
	* machines have both EISA and PCI adapters installed. Rather than turn
	* pci_port into an array, we reserve bus 0 for EISA and call the EISA
	* routines if the access is to a port on bus 0. We don't want to fix
	* EISA and ISA drivers which assume port space is <= 0xffff.
	*/

	#ifdef CONFIG_EISA
	#define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
	#define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
	#else
	#define EISA_IN(size)
	#define EISA_OUT(size)
	#endif

	#define PCI_PORT_IN(type, size) \
	u##size in##type (int addr) \
	{ \
	int b = PCI_PORT_HBA(addr); \
	EISA_IN(size); \
	if (!parisc_pci_hba[b]) return (u##size) -1; \
	return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
	} \
	EXPORT_SYMBOL(in##type);

	PCI_PORT_IN(b, 8)
	PCI_PORT_IN(w, 16)
	PCI_PORT_IN(l, 32)


	#define PCI_PORT_OUT(type, size) \
	void out##type (u##size d, int addr) \
	{ \
	int b = PCI_PORT_HBA(addr); \
	EISA_OUT(size); \
	if (!parisc_pci_hba[b]) return; \
	pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
	} \
	EXPORT_SYMBOL(out##type);

	PCI_PORT_OUT(b, 8)
	PCI_PORT_OUT(w, 16)
	PCI_PORT_OUT(l, 32)



	/*
	* BIOS32 replacement.
	*/
	static int __init pcibios_init(void)
	{
	if (!pci_bios)
	return -1;

	if (pci_bios->init) {
	pci_bios->init();
	} else {
	printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
	}

	/* Set the CLS for PCI as early as possible. */
	pci_cache_line_size = pci_dfl_cache_line_size;

	return 0;
	}


	/* Called from pci_do_scan_bus() after walking a bus but before walking PPBs. */
	void pcibios_fixup_bus(struct pci_bus *bus)
	{
	if (pci_bios->fixup_bus) {
	pci_bios->fixup_bus(bus);
	} else {
	printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
	}
	}


	char pcibios_setup(char str)
	{
	return str;
	}

	/*
	* Called by pci_set_master() - a driver interface.
	*
	* Legacy PDC guarantees to set:
	* Map Memory BAR's into PA IO space.
	* Map Expansion ROM BAR into one common PA IO space per bus.
	* Map IO BAR's into PCI IO space.
	* Command (see below)
	* Cache Line Size
	* Latency Timer
	* Interrupt Line
	* PPB: secondary latency timer, io/mmio base/limit,
	* bus numbers, bridge control
	*
	*/
	void pcibios_set_master(struct pci_dev *dev)
	{
	u8 lat;

	/* If someone already mucked with this, don't touch it. */
	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
	if (lat >= 16) return;

	/*
	** HP generally has fewer devices on the bus than other architectures.
	** upper byte is PCI_LATENCY_TIMER.
	*/
	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
	(0x80 << 8) \| pci_cache_line_size);
	}


	void __init pcibios_init_bus(struct pci_bus *bus)
	{
	struct pci_dev *dev = bus->self;
	unsigned short bridge_ctl;

	/* We deal only with pci controllers and pci-pci bridges. */
	if (!dev \|\| (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
	return;

	/* PCI-PCI bridge - set the cache line and default latency
	(32) for primary and secondary buses. */
	pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);

	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
	bridge_ctl \|= PCI_BRIDGE_CTL_PARITY \| PCI_BRIDGE_CTL_SERR;
	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
	}

	/* called by drivers/pci/setup-bus.c:pci_setup_bridge(). */
	void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
	struct pci_bus_region region, struct resource res)
	{
	#ifdef CONFIG_64BIT
	struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
	#endif

	if (res->flags & IORESOURCE_IO) {
	/*
	** I/O space may see busnumbers here. Something
	** in the form of 0xbbxxxx where bb is the bus num
	** and xxxx is the I/O port space address.
	** Remaining address translation are done in the
	** PCI Host adapter specific code - ie dino_out8.
	*/
	region->start = PCI_PORT_ADDR(res->start);
	region->end = PCI_PORT_ADDR(res->end);
	} else if (res->flags & IORESOURCE_MEM) {
	/* Convert MMIO addr to PCI addr (undo global virtualization) */
	region->start = PCI_BUS_ADDR(hba, res->start);
	region->end = PCI_BUS_ADDR(hba, res->end);
	}

	DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
	dev->bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
	region->start, region->end);
	}

	void pcibios_bus_to_resource(struct pci_dev dev, struct resource res,
	struct pci_bus_region *region)
	{
	#ifdef CONFIG_64BIT
	struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
	#endif

	if (res->flags & IORESOURCE_MEM) {
	res->start = PCI_HOST_ADDR(hba, region->start);
	res->end = PCI_HOST_ADDR(hba, region->end);
	}

	if (res->flags & IORESOURCE_IO) {
	res->start = region->start;
	res->end = region->end;
	}
	}

	#ifdef CONFIG_HOTPLUG
	EXPORT_SYMBOL(pcibios_resource_to_bus);
	EXPORT_SYMBOL(pcibios_bus_to_resource);
	#endif

	/*
	* pcibios align resources() is called every time generic PCI code
	* wants to generate a new address. The process of looking for
	* an available address, each candidate is first "aligned" and
	* then checked if the resource is available until a match is found.
	*
	* Since we are just checking candidates, don't use any fields other
	* than res->start.
	*/
	void pcibios_align_resource(void data, struct resource res,
	resource_size_t size, resource_size_t alignment)
	{
	resource_size_t mask, align;

	DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
	pci_name(((struct pci_dev *) data)),
	res->parent, res->start, res->end,
	(int) res->flags, size, alignment);

	/* If it's not IO, then it's gotta be MEM */
	align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

	/* Align to largest of MIN or input size */
	mask = max(alignment, align) - 1;
	res->start += mask;
	res->start &= ~mask;

	/* The caller updates the end field, we don't. */
	}


	/*
	* A driver is enabling the device. We make sure that all the appropriate
	* bits are set to allow the device to operate as the driver is expecting.
	* We enable the port IO and memory IO bits if the device has any BARs of
	* that type, and we enable the PERR and SERR bits unconditionally.
	* Drivers that do not need parity (eg graphics and possibly networking)
	* can clear these bits if they want.
	*/
	int pcibios_enable_device(struct pci_dev *dev, int mask)
	{
	int err;
	u16 cmd, old_cmd;

	err = pci_enable_resources(dev, mask);
	if (err < 0)
	return err;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	old_cmd = cmd;

	cmd \|= (PCI_COMMAND_SERR \| PCI_COMMAND_PARITY);

	#if 0
	/* If bridge/bus controller has FBB enabled, child must too. */
	if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
	cmd \|= PCI_COMMAND_FAST_BACK;
	#endif

	if (cmd != old_cmd) {
	dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
	old_cmd, cmd);
	pci_write_config_word(dev, PCI_COMMAND, cmd);
	}
	return 0;
	}


	/* PA-RISC specific */
	void pcibios_register_hba(struct pci_hba_data *hba)
	{
	if (pci_hba_count >= PCI_HBA_MAX) {
	printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
	return;
	}

	parisc_pci_hba[pci_hba_count] = hba;
	hba->hba_num = pci_hba_count++;
	}

	subsys_initcall(pcibios_init);