[mirror_ubuntu-focal-kernel.git] / arch / mips / pci / pci-legacy.c

/*
 * This program is free software; you can redistribute	it and/or modify it
 * under  the terms of	the GNU General	 Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2011 Wind River Systems,
 *   written by Ralf Baechle (ralf@linux-mips.org)
 */
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/of_address.h>

#include <asm/cpu-info.h>

/*
 * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource
 * assignments.
 */

/*
 * The PCI controller list.
 */
static LIST_HEAD(controllers);

static int pci_initialized;

/*
 * We need to avoid collisions with `mirrored' VGA ports
 * and other strange ISA hardware, so we always want the
 * addresses to be allocated in the 0x000-0x0ff region
 * modulo 0x400.
 *
 * Why? Because some silly external IO cards only decode
 * the low 10 bits of the IO address. The 0x00-0xff region
 * is reserved for motherboard devices that decode all 16
 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
 * but we want to try to avoid allocating at 0x2900-0x2bff
 * which might have be mirrored at 0x0100-0x03ff..
 */
resource_size_t
pcibios_align_resource(void *data, const struct resource *res,
		       resource_size_t size, resource_size_t align)
{
	struct pci_dev *dev = data;
	struct pci_controller *hose = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
		/* Make sure we start at our min on all hoses */
		if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
			start = PCIBIOS_MIN_IO + hose->io_resource->start;

		/*
		 * Put everything into 0x00-0xff region modulo 0x400
		 */
		if (start & 0x300)
			start = (start + 0x3ff) & ~0x3ff;
	} else if (res->flags & IORESOURCE_MEM) {
		/* Make sure we start at our min on all hoses */
		if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
			start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
	}

	return start;
}

static void pcibios_scanbus(struct pci_controller *hose)
{
	static int next_busno;
	static int need_domain_info;
	LIST_HEAD(resources);
	struct pci_bus *bus;
	struct pci_host_bridge *bridge;
	int ret;

	bridge = pci_alloc_host_bridge(0);
	if (!bridge)
		return;

	if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
		next_busno = (*hose->get_busno)();

	pci_add_resource_offset(&resources,
				hose->mem_resource, hose->mem_offset);
	pci_add_resource_offset(&resources,
				hose->io_resource, hose->io_offset);
	pci_add_resource(&resources, hose->busn_resource);
	list_splice_init(&resources, &bridge->windows);
	bridge->dev.parent = NULL;
	bridge->sysdata = hose;
	bridge->busnr = next_busno;
	bridge->ops = hose->pci_ops;
	bridge->swizzle_irq = pci_common_swizzle;
	bridge->map_irq = pcibios_map_irq;
	ret = pci_scan_root_bus_bridge(bridge);
	if (ret) {
		pci_free_host_bridge(bridge);
		return;
	}

	hose->bus = bus = bridge->bus;

	need_domain_info = need_domain_info || pci_domain_nr(bus);
	set_pci_need_domain_info(hose, need_domain_info);

	next_busno = bus->busn_res.end + 1;
	/* Don't allow 8-bit bus number overflow inside the hose -
	   reserve some space for bridges. */
	if (next_busno > 224) {
		next_busno = 0;
		need_domain_info = 1;
	}

	/*
	 * We insert PCI resources into the iomem_resource and
	 * ioport_resource trees in either pci_bus_claim_resources()
	 * or pci_bus_assign_resources().
	 */
	if (pci_has_flag(PCI_PROBE_ONLY)) {
		pci_bus_claim_resources(bus);
	} else {
		pci_bus_size_bridges(bus);
		pci_bus_assign_resources(bus);
	}
	pci_bus_add_devices(bus);
}

#ifdef CONFIG_OF
void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
{
	struct of_pci_range range;
	struct of_pci_range_parser parser;

	pr_info("PCI host bridge %pOF ranges:\n", node);
	hose->of_node = node;

	if (of_pci_range_parser_init(&parser, node))
		return;

	for_each_of_pci_range(&parser, &range) {
		struct resource *res = NULL;

		switch (range.flags & IORESOURCE_TYPE_BITS) {
		case IORESOURCE_IO:
			pr_info("  IO 0x%016llx..0x%016llx\n",
				range.cpu_addr,
				range.cpu_addr + range.size - 1);
			hose->io_map_base =
				(unsigned long)ioremap(range.cpu_addr,
						       range.size);
			res = hose->io_resource;
			break;
		case IORESOURCE_MEM:
			pr_info(" MEM 0x%016llx..0x%016llx\n",
				range.cpu_addr,
				range.cpu_addr + range.size - 1);
			res = hose->mem_resource;
			break;
		}
		if (res != NULL)
			of_pci_range_to_resource(&range, node, res);
	}
}

struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
{
	struct pci_controller *hose = bus->sysdata;

	return of_node_get(hose->of_node);
}
#endif

static DEFINE_MUTEX(pci_scan_mutex);

void register_pci_controller(struct pci_controller *hose)
{
	struct resource *parent;

	parent = hose->mem_resource->parent;
	if (!parent)
		parent = &iomem_resource;

	if (request_resource(parent, hose->mem_resource) < 0)
		goto out;

	parent = hose->io_resource->parent;
	if (!parent)
		parent = &ioport_resource;

	if (request_resource(parent, hose->io_resource) < 0) {
		release_resource(hose->mem_resource);
		goto out;
	}

	INIT_LIST_HEAD(&hose->list);
	list_add_tail(&hose->list, &controllers);

	/*
	 * Do not panic here but later - this might happen before console init.
	 */
	if (!hose->io_map_base) {
		printk(KERN_WARNING
		       "registering PCI controller with io_map_base unset\n");
	}

	/*
	 * Scan the bus if it is register after the PCI subsystem
	 * initialization.
	 */
	if (pci_initialized) {
		mutex_lock(&pci_scan_mutex);
		pcibios_scanbus(hose);
		mutex_unlock(&pci_scan_mutex);
	}

	return;

out:
	printk(KERN_WARNING
	       "Skipping PCI bus scan due to resource conflict\n");
}

static int __init pcibios_init(void)
{
	struct pci_controller *hose;

	/* Scan all of the recorded PCI controllers.  */
	list_for_each_entry(hose, &controllers, list)
		pcibios_scanbus(hose);

	pci_initialized = 1;

	return 0;
}

subsys_initcall(pcibios_init);

static int pcibios_enable_resources(struct pci_dev *dev, int mask)
{
	u16 cmd, old_cmd;
	int idx;
	struct resource *r;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	old_cmd = cmd;
	for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
		/* Only set up the requested stuff */
		if (!(mask & (1<<idx)))
			continue;

		r = &dev->resource[idx];
		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
			continue;
		if ((idx == PCI_ROM_RESOURCE) &&
				(!(r->flags & IORESOURCE_ROM_ENABLE)))
			continue;
		if (!r->start && r->end) {
			printk(KERN_ERR "PCI: Device %s not available "
			       "because of resource collisions\n",
			       pci_name(dev));
			return -EINVAL;
		}
		if (r->flags & IORESOURCE_IO)
			cmd |= PCI_COMMAND_IO;
		if (r->flags & IORESOURCE_MEM)
			cmd |= PCI_COMMAND_MEMORY;
	}
	if (cmd != old_cmd) {
		printk("PCI: Enabling device %s (%04x -> %04x)\n",
		       pci_name(dev), old_cmd, cmd);
		pci_write_config_word(dev, PCI_COMMAND, cmd);
	}
	return 0;
}

int pcibios_enable_device(struct pci_dev *dev, int mask)
{
	int err;

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

	return pcibios_plat_dev_init(dev);
}

void pcibios_fixup_bus(struct pci_bus *bus)
{
	struct pci_dev *dev = bus->self;

	if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
	    (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
		pci_read_bridge_bases(bus);
	}
}

char * (*pcibios_plat_setup)(char *str) __initdata;

char *__init pcibios_setup(char *str)
{
	if (pcibios_plat_setup)
		return pcibios_plat_setup(str);
	return str;
}
Commit	Line	Data
f8091a88 PB	1	/*
	2	* This program is free software; you can redistribute it and/or modify it
	3	* under the terms of the GNU General Public License as published by the
	4	* Free Software Foundation; either version 2 of the License, or (at your
	5	* option) any later version.
	6	*
	7	* Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
	8	* Copyright (C) 2011 Wind River Systems,
	9	* written by Ralf Baechle (ralf@linux-mips.org)
	10	*/
	11	#include <linux/bug.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/bootmem.h>
	15	#include <linux/export.h>
	16	#include <linux/init.h>
	17	#include <linux/types.h>
	18	#include <linux/pci.h>
	19	#include <linux/of_address.h>
	20
	21	#include <asm/cpu-info.h>
	22
	23	/*
	24	* If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource
	25	* assignments.
	26	*/
	27
	28	/*
	29	* The PCI controller list.
	30	*/
	31	static LIST_HEAD(controllers);
	32
	33	static int pci_initialized;
	34
	35	/*
	36	* We need to avoid collisions with `mirrored' VGA ports
	37	* and other strange ISA hardware, so we always want the
	38	* addresses to be allocated in the 0x000-0x0ff region
	39	* modulo 0x400.
	40	*
	41	* Why? Because some silly external IO cards only decode
	42	* the low 10 bits of the IO address. The 0x00-0xff region
	43	* is reserved for motherboard devices that decode all 16
	44	* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
	45	* but we want to try to avoid allocating at 0x2900-0x2bff
	46	* which might have be mirrored at 0x0100-0x03ff..
	47	*/
	48	resource_size_t
	49	pcibios_align_resource(void data, const struct resource res,
	50	resource_size_t size, resource_size_t align)
	51	{
	52	struct pci_dev *dev = data;
	53	struct pci_controller *hose = dev->sysdata;
	54	resource_size_t start = res->start;
	55
	56	if (res->flags & IORESOURCE_IO) {
	57	/* Make sure we start at our min on all hoses */
	58	if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
	59	start = PCIBIOS_MIN_IO + hose->io_resource->start;
	60
	61	/*
	62	* Put everything into 0x00-0xff region modulo 0x400
	63	*/
	64	if (start & 0x300)
65	start = (start + 0x3ff) & ~0x3ff;
66	} else if (res->flags & IORESOURCE_MEM) {
67	/* Make sure we start at our min on all hoses */
68	if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
69	start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
70	}
71
72	return start;
73	}
74
75	static void pcibios_scanbus(struct pci_controller *hose)
76	{
77	static int next_busno;
78	static int need_domain_info;
79	LIST_HEAD(resources);
80	struct pci_bus *bus;
04c81c72 LP	81	struct pci_host_bridge *bridge;
	82	int ret;
	83
	84	bridge = pci_alloc_host_bridge(0);
	85	if (!bridge)
	86	return;
f8091a88 PB	87
	88	if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
	89	next_busno = (*hose->get_busno)();
	90
	91	pci_add_resource_offset(&resources,
	92	hose->mem_resource, hose->mem_offset);
	93	pci_add_resource_offset(&resources,
	94	hose->io_resource, hose->io_offset);
7ee214b5	95	pci_add_resource(&resources, hose->busn_resource);
04c81c72 LP	96	list_splice_init(&resources, &bridge->windows);
	97	bridge->dev.parent = NULL;
	98	bridge->sysdata = hose;
	99	bridge->busnr = next_busno;
	100	bridge->ops = hose->pci_ops;
	101	bridge->swizzle_irq = pci_common_swizzle;
	102	bridge->map_irq = pcibios_map_irq;
	103	ret = pci_scan_root_bus_bridge(bridge);
	104	if (ret) {
	105	pci_free_host_bridge(bridge);
f8091a88 PB	106	return;
	107	}
	108
04c81c72	109	hose->bus = bus = bridge->bus;
902d886d LP	110
	111	need_domain_info = need_domain_info \|\| pci_domain_nr(bus);
	112	set_pci_need_domain_info(hose, need_domain_info);
	113
f8091a88 PB	114	next_busno = bus->busn_res.end + 1;
	115	/* Don't allow 8-bit bus number overflow inside the hose -
	116	reserve some space for bridges. */
	117	if (next_busno > 224) {
	118	next_busno = 0;
	119	need_domain_info = 1;
	120	}
	121
	122	/*
	123	* We insert PCI resources into the iomem_resource and
	124	* ioport_resource trees in either pci_bus_claim_resources()
	125	* or pci_bus_assign_resources().
	126	*/
	127	if (pci_has_flag(PCI_PROBE_ONLY)) {
	128	pci_bus_claim_resources(bus);
	129	} else {
	130	pci_bus_size_bridges(bus);
	131	pci_bus_assign_resources(bus);
	132	}
	133	pci_bus_add_devices(bus);
	134	}
	135
	136	#ifdef CONFIG_OF
	137	void pci_load_of_ranges(struct pci_controller hose, struct device_node node)
	138	{
	139	struct of_pci_range range;
	140	struct of_pci_range_parser parser;
	141
7f27b5b8	142	pr_info("PCI host bridge %pOF ranges:\n", node);
f8091a88 PB	143	hose->of_node = node;
	144
	145	if (of_pci_range_parser_init(&parser, node))
	146	return;
	147
	148	for_each_of_pci_range(&parser, &range) {
	149	struct resource *res = NULL;
	150
	151	switch (range.flags & IORESOURCE_TYPE_BITS) {
	152	case IORESOURCE_IO:
	153	pr_info(" IO 0x%016llx..0x%016llx\n",
	154	range.cpu_addr,
	155	range.cpu_addr + range.size - 1);
	156	hose->io_map_base =
	157	(unsigned long)ioremap(range.cpu_addr,
	158	range.size);
	159	res = hose->io_resource;
	160	break;
	161	case IORESOURCE_MEM:
	162	pr_info(" MEM 0x%016llx..0x%016llx\n",
	163	range.cpu_addr,
	164	range.cpu_addr + range.size - 1);
	165	res = hose->mem_resource;
	166	break;
	167	}
	168	if (res != NULL)
	169	of_pci_range_to_resource(&range, node, res);
	170	}
	171	}
	172
	173	struct device_node pcibios_get_phb_of_node(struct pci_bus bus)
	174	{
	175	struct pci_controller *hose = bus->sysdata;
	176
	177	return of_node_get(hose->of_node);
	178	}
	179	#endif
	180
	181	static DEFINE_MUTEX(pci_scan_mutex);
	182
	183	void register_pci_controller(struct pci_controller *hose)
	184	{
	185	struct resource *parent;
	186
	187	parent = hose->mem_resource->parent;
	188	if (!parent)
	189	parent = &iomem_resource;
	190
	191	if (request_resource(parent, hose->mem_resource) < 0)
	192	goto out;
	193
	194	parent = hose->io_resource->parent;
	195	if (!parent)
	196	parent = &ioport_resource;
	197
	198	if (request_resource(parent, hose->io_resource) < 0) {
	199	release_resource(hose->mem_resource);
	200	goto out;
	201	}
	202
	203	INIT_LIST_HEAD(&hose->list);
edb0b6a0	204	list_add_tail(&hose->list, &controllers);
f8091a88 PB	205
	206	/*
	207	* Do not panic here but later - this might happen before console init.
	208	*/
	209	if (!hose->io_map_base) {
	210	printk(KERN_WARNING
	211	"registering PCI controller with io_map_base unset\n");
	212	}
	213
	214	/*
	215	* Scan the bus if it is register after the PCI subsystem
	216	* initialization.
	217	*/
	218	if (pci_initialized) {
	219	mutex_lock(&pci_scan_mutex);
	220	pcibios_scanbus(hose);
	221	mutex_unlock(&pci_scan_mutex);
	222	}
	223
	224	return;
	225
	226	out:
	227	printk(KERN_WARNING
	228	"Skipping PCI bus scan due to resource conflict\n");
	229	}
	230
	231	static int __init pcibios_init(void)
	232	{
	233	struct pci_controller *hose;
	234
	235	/* Scan all of the recorded PCI controllers. */
	236	list_for_each_entry(hose, &controllers, list)
	237	pcibios_scanbus(hose);
	238
f8091a88 PB	239	pci_initialized = 1;
	240
	241	return 0;
	242	}
	243
	244	subsys_initcall(pcibios_init);
	245
	246	static int pcibios_enable_resources(struct pci_dev *dev, int mask)
	247	{
	248	u16 cmd, old_cmd;
	249	int idx;
	250	struct resource *r;
	251
	252	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	253	old_cmd = cmd;
	254	for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
	255	/* Only set up the requested stuff */
	256	if (!(mask & (1<<idx)))
	257	continue;
	258
	259	r = &dev->resource[idx];
	260	if (!(r->flags & (IORESOURCE_IO \| IORESOURCE_MEM)))
	261	continue;
	262	if ((idx == PCI_ROM_RESOURCE) &&
	263	(!(r->flags & IORESOURCE_ROM_ENABLE)))
	264	continue;
	265	if (!r->start && r->end) {
	266	printk(KERN_ERR "PCI: Device %s not available "
	267	"because of resource collisions\n",
	268	pci_name(dev));
	269	return -EINVAL;
	270	}
	271	if (r->flags & IORESOURCE_IO)
	272	cmd \|= PCI_COMMAND_IO;
	273	if (r->flags & IORESOURCE_MEM)
	274	cmd \|= PCI_COMMAND_MEMORY;
	275	}
	276	if (cmd != old_cmd) {
	277	printk("PCI: Enabling device %s (%04x -> %04x)\n",
	278	pci_name(dev), old_cmd, cmd);
	279	pci_write_config_word(dev, PCI_COMMAND, cmd);
	280	}
	281	return 0;
	282	}
	283
	284	int pcibios_enable_device(struct pci_dev *dev, int mask)
	285	{
	286	int err;
	287
	288	if ((err = pcibios_enable_resources(dev, mask)) < 0)
	289	return err;
	290
	291	return pcibios_plat_dev_init(dev);
	292	}
	293
	294	void pcibios_fixup_bus(struct pci_bus *bus)
	295	{
	296	struct pci_dev *dev = bus->self;
	297
	298	if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
	299	(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
	300	pci_read_bridge_bases(bus);
	301	}
	302	}
303
304	char * (pcibios_plat_setup)(char str) __initdata;
305
306	char __init pcibios_setup(char str)
307	{
308	if (pcibios_plat_setup)
309	return pcibios_plat_setup(str);
310	return str;
311	}