[linux.git] / arch / x86 / pci / intel_mid_pci.c

/*
 * Intel MID PCI support
 *   Copyright (c) 2008 Intel Corporation
 *     Jesse Barnes <[email protected]>
 *
 * Moorestown has an interesting PCI implementation:
 *   - configuration space is memory mapped (as defined by MCFG)
 *   - Lincroft devices also have a real, type 1 configuration space
 *   - Early Lincroft silicon has a type 1 access bug that will cause
 *     a hang if non-existent devices are accessed
 *   - some devices have the "fixed BAR" capability, which means
 *     they can't be relocated or modified; check for that during
 *     BAR sizing
 *
 * So, we use the MCFG space for all reads and writes, but also send
 * Lincroft writes to type 1 space.  But only read/write if the device
 * actually exists, otherwise return all 1s for reads and bit bucket
 * the writes.
 */

#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/smp.h>

#include <asm/segment.h>
#include <asm/pci_x86.h>
#include <asm/hw_irq.h>
#include <asm/io_apic.h>
#include <asm/intel-mid.h>

#define PCIE_CAP_OFFSET	0x100

/* Quirks for the listed devices */
#define PCI_DEVICE_ID_INTEL_MRFLD_MMC	0x1190
#define PCI_DEVICE_ID_INTEL_MRFLD_HSU	0x1191

/* Fixed BAR fields */
#define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00	/* Fixed BAR (TBD) */
#define PCI_FIXED_BAR_0_SIZE	0x04
#define PCI_FIXED_BAR_1_SIZE	0x08
#define PCI_FIXED_BAR_2_SIZE	0x0c
#define PCI_FIXED_BAR_3_SIZE	0x10
#define PCI_FIXED_BAR_4_SIZE	0x14
#define PCI_FIXED_BAR_5_SIZE	0x1c

static int pci_soc_mode;

/**
 * fixed_bar_cap - return the offset of the fixed BAR cap if found
 * @bus: PCI bus
 * @devfn: device in question
 *
 * Look for the fixed BAR cap on @bus and @devfn, returning its offset
 * if found or 0 otherwise.
 */
static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
{
	int pos;
	u32 pcie_cap = 0, cap_data;

	pos = PCIE_CAP_OFFSET;

	if (!raw_pci_ext_ops)
		return 0;

	while (pos) {
		if (raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
					  devfn, pos, 4, &pcie_cap))
			return 0;

		if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 ||
			PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
			break;

		if (PCI_EXT_CAP_ID(pcie_cap) == PCI_EXT_CAP_ID_VNDR) {
			raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
					      devfn, pos + 4, 4, &cap_data);
			if ((cap_data & 0xffff) == PCIE_VNDR_CAP_ID_FIXED_BAR)
				return pos;
		}

		pos = PCI_EXT_CAP_NEXT(pcie_cap);
	}

	return 0;
}

static int pci_device_update_fixed(struct pci_bus *bus, unsigned int devfn,
				   int reg, int len, u32 val, int offset)
{
	u32 size;
	unsigned int domain, busnum;
	int bar = (reg - PCI_BASE_ADDRESS_0) >> 2;

	domain = pci_domain_nr(bus);
	busnum = bus->number;

	if (val == ~0 && len == 4) {
		unsigned long decode;

		raw_pci_ext_ops->read(domain, busnum, devfn,
			       offset + 8 + (bar * 4), 4, &size);

		/* Turn the size into a decode pattern for the sizing code */
		if (size) {
			decode = size - 1;
			decode |= decode >> 1;
			decode |= decode >> 2;
			decode |= decode >> 4;
			decode |= decode >> 8;
			decode |= decode >> 16;
			decode++;
			decode = ~(decode - 1);
		} else {
			decode = 0;
		}

		/*
		 * If val is all ones, the core code is trying to size the reg,
		 * so update the mmconfig space with the real size.
		 *
		 * Note: this assumes the fixed size we got is a power of two.
		 */
		return raw_pci_ext_ops->write(domain, busnum, devfn, reg, 4,
				       decode);
	}

	/* This is some other kind of BAR write, so just do it. */
	return raw_pci_ext_ops->write(domain, busnum, devfn, reg, len, val);
}

/**
 * type1_access_ok - check whether to use type 1
 * @bus: bus number
 * @devfn: device & function in question
 *
 * If the bus is on a Lincroft chip and it exists, or is not on a Lincroft at
 * all, the we can go ahead with any reads & writes.  If it's on a Lincroft,
 * but doesn't exist, avoid the access altogether to keep the chip from
 * hanging.
 */
static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
{
	/*
	 * This is a workaround for A0 LNC bug where PCI status register does
	 * not have new CAP bit set. can not be written by SW either.
	 *
	 * PCI header type in real LNC indicates a single function device, this
	 * will prevent probing other devices under the same function in PCI
	 * shim. Therefore, use the header type in shim instead.
	 */
	if (reg >= 0x100 || reg == PCI_STATUS || reg == PCI_HEADER_TYPE)
		return false;
	if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
				|| devfn == PCI_DEVFN(0, 0)
				|| devfn == PCI_DEVFN(3, 0)))
		return true;
	return false; /* Langwell on others */
}

static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
		    int size, u32 *value)
{
	if (type1_access_ok(bus->number, devfn, where))
		return pci_direct_conf1.read(pci_domain_nr(bus), bus->number,
					devfn, where, size, value);
	return raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
			      devfn, where, size, value);
}

static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
		     int size, u32 value)
{
	int offset;

	/*
	 * On MRST, there is no PCI ROM BAR, this will cause a subsequent read
	 * to ROM BAR return 0 then being ignored.
	 */
	if (where == PCI_ROM_ADDRESS)
		return 0;

	/*
	 * Devices with fixed BARs need special handling:
	 *   - BAR sizing code will save, write ~0, read size, restore
	 *   - so writes to fixed BARs need special handling
	 *   - other writes to fixed BAR devices should go through mmconfig
	 */
	offset = fixed_bar_cap(bus, devfn);
	if (offset &&
	    (where >= PCI_BASE_ADDRESS_0 && where <= PCI_BASE_ADDRESS_5)) {
		return pci_device_update_fixed(bus, devfn, where, size, value,
					       offset);
	}

	/*
	 * On Moorestown update both real & mmconfig space
	 * Note: early Lincroft silicon can't handle type 1 accesses to
	 *       non-existent devices, so just eat the write in that case.
	 */
	if (type1_access_ok(bus->number, devfn, where))
		return pci_direct_conf1.write(pci_domain_nr(bus), bus->number,
					      devfn, where, size, value);
	return raw_pci_ext_ops->write(pci_domain_nr(bus), bus->number, devfn,
			       where, size, value);
}

static int intel_mid_pci_irq_enable(struct pci_dev *dev)
{
	struct irq_alloc_info info;
	int polarity;
	int ret;
	u8 gsi;

	if (dev->irq_managed && dev->irq > 0)
		return 0;

	ret = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	if (ret < 0) {
		dev_warn(&dev->dev, "Failed to read interrupt line: %d\n", ret);
		return ret;
	}

	switch (intel_mid_identify_cpu()) {
	case INTEL_MID_CPU_CHIP_TANGIER:
		polarity = IOAPIC_POL_HIGH;

		/* Special treatment for IRQ0 */
		if (gsi == 0) {
			/*
			 * Skip HS UART common registers device since it has
			 * IRQ0 assigned and not used by the kernel.
			 */
			if (dev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU)
				return -EBUSY;
			/*
			 * TNG has IRQ0 assigned to eMMC controller. But there
			 * are also other devices with bogus PCI configuration
			 * that have IRQ0 assigned. This check ensures that
			 * eMMC gets it. The rest of devices still could be
			 * enabled without interrupt line being allocated.
			 */
			if (dev->device != PCI_DEVICE_ID_INTEL_MRFLD_MMC)
				return 0;
		}
		break;
	default:
		polarity = IOAPIC_POL_LOW;
		break;
	}

	ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity);

	/*
	 * MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
	 * IOAPIC RTE entries, so we just enable RTE for the device.
	 */
	ret = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
	if (ret < 0)
		return ret;

	dev->irq = ret;
	dev->irq_managed = 1;

	return 0;
}

static void intel_mid_pci_irq_disable(struct pci_dev *dev)
{
	if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
	    dev->irq > 0) {
		mp_unmap_irq(dev->irq);
		dev->irq_managed = 0;
	}
}

static struct pci_ops intel_mid_pci_ops = {
	.read = pci_read,
	.write = pci_write,
};

/**
 * intel_mid_pci_init - installs intel_mid_pci_ops
 *
 * Moorestown has an interesting PCI implementation (see above).
 * Called when the early platform detection installs it.
 */
int __init intel_mid_pci_init(void)
{
	pr_info("Intel MID platform detected, using MID PCI ops\n");
	pci_mmcfg_late_init();
	pcibios_enable_irq = intel_mid_pci_irq_enable;
	pcibios_disable_irq = intel_mid_pci_irq_disable;
	pci_root_ops = intel_mid_pci_ops;
	pci_soc_mode = 1;
	/* Continue with standard init */
	return 1;
}

/*
 * Langwell devices are not true PCI devices; they are not subject to 10 ms
 * d3 to d0 delay required by PCI spec.
 */
static void pci_d3delay_fixup(struct pci_dev *dev)
{
	/*
	 * PCI fixups are effectively decided compile time. If we have a dual
	 * SoC/non-SoC kernel we don't want to mangle d3 on non-SoC devices.
	 */
	if (!pci_soc_mode)
		return;
	/*
	 * True PCI devices in Lincroft should allow type 1 access, the rest
	 * are Langwell fake PCI devices.
	 */
	if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID))
		return;
	dev->d3_delay = 0;
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup);

static void mid_power_off_one_device(struct pci_dev *dev)
{
	u16 pmcsr;

	/*
	 * Update current state first, otherwise PCI core enforces PCI_D0 in
	 * pci_set_power_state() for devices which status was PCI_UNKNOWN.
	 */
	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
	dev->current_state = (pci_power_t __force)(pmcsr & PCI_PM_CTRL_STATE_MASK);

	pci_set_power_state(dev, PCI_D3hot);
}

static void mid_power_off_devices(struct pci_dev *dev)
{
	int id;

	if (!pci_soc_mode)
		return;

	id = intel_mid_pwr_get_lss_id(dev);
	if (id < 0)
		return;

	/*
	 * This sets only PMCSR bits. The actual power off will happen in
	 * arch/x86/platform/intel-mid/pwr.c.
	 */
	mid_power_off_one_device(dev);
}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, mid_power_off_devices);

/*
 * Langwell devices reside at fixed offsets, don't try to move them.
 */
static void pci_fixed_bar_fixup(struct pci_dev *dev)
{
	unsigned long offset;
	u32 size;
	int i;

	if (!pci_soc_mode)
		return;

	/* Must have extended configuration space */
	if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
		return;

	/* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
	offset = fixed_bar_cap(dev->bus, dev->devfn);
	if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||
	    PCI_DEVFN(2, 2) == dev->devfn)
		return;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		pci_read_config_dword(dev, offset + 8 + (i * 4), &size);
		dev->resource[i].end = dev->resource[i].start + size - 1;
		dev->resource[i].flags |= IORESOURCE_PCI_FIXED;
	}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixed_bar_fixup);
Commit	Line	Data
a712ffbc	1	/*
05454c26	2	* Intel MID PCI support
a712ffbc JB	3	* Copyright (c) 2008 Intel Corporation
	4	* Jesse Barnes <[email protected]>
	5	*
	6	* Moorestown has an interesting PCI implementation:
	7	* - configuration space is memory mapped (as defined by MCFG)
	8	* - Lincroft devices also have a real, type 1 configuration space
	9	* - Early Lincroft silicon has a type 1 access bug that will cause
	10	* a hang if non-existent devices are accessed
	11	* - some devices have the "fixed BAR" capability, which means
	12	* they can't be relocated or modified; check for that during
	13	* BAR sizing
	14	*
	15	* So, we use the MCFG space for all reads and writes, but also send
	16	* Lincroft writes to type 1 space. But only read/write if the device
	17	* actually exists, otherwise return all 1s for reads and bit bucket
	18	* the writes.
	19	*/
	20
	21	#include <linux/sched.h>
	22	#include <linux/pci.h>
	23	#include <linux/ioport.h>
	24	#include <linux/init.h>
	25	#include <linux/dmi.h>
7cc24e12 VM	26	#include <linux/acpi.h>
	27	#include <linux/io.h>
	28	#include <linux/smp.h>
a712ffbc	29
a712ffbc	30	#include <asm/segment.h>
a712ffbc JB	31	#include <asm/pci_x86.h>
	32	#include <asm/hw_irq.h>
	33	#include <asm/io_apic.h>
bc20aa48	34	#include <asm/intel-mid.h>
a712ffbc JB	35
	36	#define PCIE_CAP_OFFSET 0x100
	37
39d9b77b	38	/* Quirks for the listed devices */
707a605b AS	39	#define PCI_DEVICE_ID_INTEL_MRFLD_MMC 0x1190
707a605b AS	40	#define PCI_DEVICE_ID_INTEL_MRFLD_HSU 0x1191
39d9b77b	41
a712ffbc JB	42	/* Fixed BAR fields */
	43	#define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00 /* Fixed BAR (TBD) */
	44	#define PCI_FIXED_BAR_0_SIZE 0x04
	45	#define PCI_FIXED_BAR_1_SIZE 0x08
	46	#define PCI_FIXED_BAR_2_SIZE 0x0c
	47	#define PCI_FIXED_BAR_3_SIZE 0x10
	48	#define PCI_FIXED_BAR_4_SIZE 0x14
	49	#define PCI_FIXED_BAR_5_SIZE 0x1c
	50
7cc24e12	51	static int pci_soc_mode;
823806ff	52
a712ffbc JB	53	/**
	54	* fixed_bar_cap - return the offset of the fixed BAR cap if found
	55	* @bus: PCI bus
	56	* @devfn: device in question
	57	*
	58	* Look for the fixed BAR cap on @bus and @devfn, returning its offset
	59	* if found or 0 otherwise.
	60	*/
	61	static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
	62	{
	63	int pos;
	64	u32 pcie_cap = 0, cap_data;
	65
	66	pos = PCIE_CAP_OFFSET;
c5411382 JP	67
	68	if (!raw_pci_ext_ops)
	69	return 0;
	70
a712ffbc JB	71	while (pos) {
	72	if (raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
	73	devfn, pos, 4, &pcie_cap))
	74	return 0;
	75
f82c3d71 JP	76	if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 \|\|
	77	PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
	78	break;
a712ffbc JB	79
	80	if (PCI_EXT_CAP_ID(pcie_cap) == PCI_EXT_CAP_ID_VNDR) {
	81	raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
	82	devfn, pos + 4, 4, &cap_data);
	83	if ((cap_data & 0xffff) == PCIE_VNDR_CAP_ID_FIXED_BAR)
	84	return pos;
	85	}
	86
f82c3d71	87	pos = PCI_EXT_CAP_NEXT(pcie_cap);
a712ffbc JB	88	}
	89
	90	return 0;
	91	}
	92
	93	static int pci_device_update_fixed(struct pci_bus *bus, unsigned int devfn,
	94	int reg, int len, u32 val, int offset)
	95	{
	96	u32 size;
	97	unsigned int domain, busnum;
	98	int bar = (reg - PCI_BASE_ADDRESS_0) >> 2;
	99
	100	domain = pci_domain_nr(bus);
	101	busnum = bus->number;
	102
	103	if (val == ~0 && len == 4) {
	104	unsigned long decode;
	105
	106	raw_pci_ext_ops->read(domain, busnum, devfn,
	107	offset + 8 + (bar * 4), 4, &size);
	108
	109	/* Turn the size into a decode pattern for the sizing code */
	110	if (size) {
	111	decode = size - 1;
	112	decode \|= decode >> 1;
	113	decode \|= decode >> 2;
	114	decode \|= decode >> 4;
	115	decode \|= decode >> 8;
	116	decode \|= decode >> 16;
	117	decode++;
	118	decode = ~(decode - 1);
	119	} else {
e4af4268	120	decode = 0;
a712ffbc JB	121	}
	122
	123	/*
	124	* If val is all ones, the core code is trying to size the reg,
	125	* so update the mmconfig space with the real size.
	126	*
	127	* Note: this assumes the fixed size we got is a power of two.
	128	*/
	129	return raw_pci_ext_ops->write(domain, busnum, devfn, reg, 4,
	130	decode);
	131	}
	132
	133	/* This is some other kind of BAR write, so just do it. */
	134	return raw_pci_ext_ops->write(domain, busnum, devfn, reg, len, val);
	135	}
	136
	137	/**
	138	* type1_access_ok - check whether to use type 1
	139	* @bus: bus number
	140	* @devfn: device & function in question
	141	*
	142	* If the bus is on a Lincroft chip and it exists, or is not on a Lincroft at
	143	* all, the we can go ahead with any reads & writes. If it's on a Lincroft,
	144	* but doesn't exist, avoid the access altogether to keep the chip from
	145	* hanging.
	146	*/
	147	static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
	148	{
7cc24e12 VM	149	/*
7cc24e12 VM	150	* This is a workaround for A0 LNC bug where PCI status register does
a712ffbc JB	151	* not have new CAP bit set. can not be written by SW either.
	152	*
	153	* PCI header type in real LNC indicates a single function device, this
	154	* will prevent probing other devices under the same function in PCI
	155	* shim. Therefore, use the header type in shim instead.
	156	*/
	157	if (reg >= 0x100 \|\| reg == PCI_STATUS \|\| reg == PCI_HEADER_TYPE)
6c21b176	158	return false;
f3f01175 BH	159	if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
	160	\|\| devfn == PCI_DEVFN(0, 0)
	161	\|\| devfn == PCI_DEVFN(3, 0)))
6c21b176 FW	162	return true;
6c21b176 FW	163	return false; /* Langwell on others */
a712ffbc JB	164	}
	165
	166	static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
	167	int size, u32 *value)
	168	{
	169	if (type1_access_ok(bus->number, devfn, where))
	170	return pci_direct_conf1.read(pci_domain_nr(bus), bus->number,
	171	devfn, where, size, value);
	172	return raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
	173	devfn, where, size, value);
	174	}
	175
	176	static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
	177	int size, u32 value)
	178	{
	179	int offset;
	180
7cc24e12 VM	181	/*
7cc24e12 VM	182	* On MRST, there is no PCI ROM BAR, this will cause a subsequent read
a712ffbc JB	183	* to ROM BAR return 0 then being ignored.
	184	*/
	185	if (where == PCI_ROM_ADDRESS)
	186	return 0;
	187
	188	/*
	189	* Devices with fixed BARs need special handling:
	190	* - BAR sizing code will save, write ~0, read size, restore
	191	* - so writes to fixed BARs need special handling
	192	* - other writes to fixed BAR devices should go through mmconfig
	193	*/
	194	offset = fixed_bar_cap(bus, devfn);
	195	if (offset &&
	196	(where >= PCI_BASE_ADDRESS_0 && where <= PCI_BASE_ADDRESS_5)) {
	197	return pci_device_update_fixed(bus, devfn, where, size, value,
	198	offset);
	199	}
	200
	201	/*
	202	* On Moorestown update both real & mmconfig space
	203	* Note: early Lincroft silicon can't handle type 1 accesses to
	204	* non-existent devices, so just eat the write in that case.
	205	*/
	206	if (type1_access_ok(bus->number, devfn, where))
	207	return pci_direct_conf1.write(pci_domain_nr(bus), bus->number,
	208	devfn, where, size, value);
	209	return raw_pci_ext_ops->write(pci_domain_nr(bus), bus->number, devfn,
	210	where, size, value);
	211	}
	212
712b6aa8	213	static int intel_mid_pci_irq_enable(struct pci_dev *dev)
a712ffbc	214	{
c4d05a2c	215	struct irq_alloc_info info;
ecc527d5	216	int polarity;
2a61c8ea	217	int ret;
5b395e2b	218	u8 gsi;
a712ffbc	219
67b4eab9	220	if (dev->irq_managed && dev->irq > 0)
cffe0a2b JL	221	return 0;
cffe0a2b JL	222
5b395e2b AS	223	ret = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	224	if (ret < 0) {
	225	dev_warn(&dev->dev, "Failed to read interrupt line: %d\n", ret);
	226	return ret;
	227	}
	228
39d9b77b AS	229	switch (intel_mid_identify_cpu()) {
39d9b77b AS	230	case INTEL_MID_CPU_CHIP_TANGIER:
5054e1e6	231	polarity = IOAPIC_POL_HIGH;
39d9b77b AS	232
39d9b77b AS	233	/* Special treatment for IRQ0 */
5b395e2b	234	if (gsi == 0) {
bb275705 AS	235	/*
	236	* Skip HS UART common registers device since it has
	237	* IRQ0 assigned and not used by the kernel.
	238	*/
707a605b	239	if (dev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU)
bb275705	240	return -EBUSY;
39d9b77b AS	241	/*
	242	* TNG has IRQ0 assigned to eMMC controller. But there
	243	* are also other devices with bogus PCI configuration
	244	* that have IRQ0 assigned. This check ensures that
bb275705 AS	245	* eMMC gets it. The rest of devices still could be
bb275705 AS	246	* enabled without interrupt line being allocated.
39d9b77b	247	*/
707a605b	248	if (dev->device != PCI_DEVICE_ID_INTEL_MRFLD_MMC)
bb275705	249	return 0;
39d9b77b AS	250	}
	251	break;
	252	default:
5054e1e6	253	polarity = IOAPIC_POL_LOW;
39d9b77b AS	254	break;
	255	}
	256
c4d05a2c	257	ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity);
a712ffbc	258
7cc24e12 VM	259	/*
7cc24e12 VM	260	* MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
a712ffbc JB	261	* IOAPIC RTE entries, so we just enable RTE for the device.
a712ffbc JB	262	*/
5b395e2b	263	ret = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
2a61c8ea AS	264	if (ret < 0)
2a61c8ea AS	265	return ret;
1b5d3e00	266
5b395e2b	267	dev->irq = ret;
cffe0a2b JL	268	dev->irq_managed = 1;
cffe0a2b JL	269
a712ffbc JB	270	return 0;
	271	}
	272
8a3e533d JL	273	static void intel_mid_pci_irq_disable(struct pci_dev *dev)
8a3e533d JL	274	{
6c777e87 BH	275	if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
6c777e87 BH	276	dev->irq > 0) {
8a3e533d	277	mp_unmap_irq(dev->irq);
cffe0a2b JL	278	dev->irq_managed = 0;
cffe0a2b JL	279	}
8a3e533d JL	280	}
8a3e533d JL	281
0abbdea1	282	static struct pci_ops intel_mid_pci_ops = {
a712ffbc JB	283	.read = pci_read,
	284	.write = pci_write,
	285	};
	286
	287	/**
712b6aa8	288	* intel_mid_pci_init - installs intel_mid_pci_ops
a712ffbc JB	289	*
	290	* Moorestown has an interesting PCI implementation (see above).
	291	* Called when the early platform detection installs it.
	292	*/
712b6aa8	293	int __init intel_mid_pci_init(void)
a712ffbc	294	{
7cc24e12	295	pr_info("Intel MID platform detected, using MID PCI ops\n");
a712ffbc	296	pci_mmcfg_late_init();
712b6aa8	297	pcibios_enable_irq = intel_mid_pci_irq_enable;
8a3e533d	298	pcibios_disable_irq = intel_mid_pci_irq_disable;
712b6aa8	299	pci_root_ops = intel_mid_pci_ops;
823806ff	300	pci_soc_mode = 1;
a712ffbc JB	301	/* Continue with standard init */
	302	return 1;
	303	}
	304
7cc24e12 VM	305	/*
	306	* Langwell devices are not true PCI devices; they are not subject to 10 ms
	307	* d3 to d0 delay required by PCI spec.
990a30c5	308	*/
a18e3690	309	static void pci_d3delay_fixup(struct pci_dev *dev)
990a30c5	310	{
7cc24e12 VM	311	/*
	312	* PCI fixups are effectively decided compile time. If we have a dual
	313	* SoC/non-SoC kernel we don't want to mangle d3 on non-SoC devices.
	314	*/
	315	if (!pci_soc_mode)
	316	return;
	317	/*
	318	* True PCI devices in Lincroft should allow type 1 access, the rest
	319	* are Langwell fake PCI devices.
990a30c5 JP	320	*/
	321	if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID))
	322	return;
	323	dev->d3_delay = 0;
	324	}
	325	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup);
	326
e99a0745	327	static void mid_power_off_one_device(struct pci_dev *dev)
990a30c5	328	{
5823d089 AS	329	u16 pmcsr;
	330
	331	/*
	332	* Update current state first, otherwise PCI core enforces PCI_D0 in
	333	* pci_set_power_state() for devices which status was PCI_UNKNOWN.
	334	*/
	335	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
	336	dev->current_state = (pci_power_t __force)(pmcsr & PCI_PM_CTRL_STATE_MASK);
	337
8497f696	338	pci_set_power_state(dev, PCI_D3hot);
990a30c5	339	}
5823d089	340
e99a0745	341	static void mid_power_off_devices(struct pci_dev *dev)
5823d089 AS	342	{
	343	int id;
	344
	345	if (!pci_soc_mode)
	346	return;
	347
	348	id = intel_mid_pwr_get_lss_id(dev);
	349	if (id < 0)
	350	return;
	351
	352	/*
	353	* This sets only PMCSR bits. The actual power off will happen in
	354	* arch/x86/platform/intel-mid/pwr.c.
	355	*/
e99a0745	356	mid_power_off_one_device(dev);
5823d089 AS	357	}
5823d089 AS	358
e99a0745	359	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, mid_power_off_devices);
990a30c5	360
a712ffbc JB	361	/*
	362	* Langwell devices reside at fixed offsets, don't try to move them.
	363	*/
a18e3690	364	static void pci_fixed_bar_fixup(struct pci_dev *dev)
a712ffbc JB	365	{
	366	unsigned long offset;
	367	u32 size;
	368	int i;
	369
823806ff AC	370	if (!pci_soc_mode)
	371	return;
	372
e9b1d5d0 PA	373	/* Must have extended configuration space */
	374	if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
	375	return;
	376
a712ffbc JB	377	/* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
	378	offset = fixed_bar_cap(dev->bus, dev->devfn);
	379	if (!offset \|\| PCI_DEVFN(2, 0) == dev->devfn \|\|
	380	PCI_DEVFN(2, 2) == dev->devfn)
	381	return;
	382
	383	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	384	pci_read_config_dword(dev, offset + 8 + (i * 4), &size);
	385	dev->resource[i].end = dev->resource[i].start + size - 1;
	386	dev->resource[i].flags \|= IORESOURCE_PCI_FIXED;
	387	}
	388	}
	389	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixed_bar_fixup);