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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel MID PCI support
4 * Copyright (c) 2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 *
7 * Moorestown has an interesting PCI implementation:
8 * - configuration space is memory mapped (as defined by MCFG)
9 * - Lincroft devices also have a real, type 1 configuration space
10 * - Early Lincroft silicon has a type 1 access bug that will cause
11 * a hang if non-existent devices are accessed
12 * - some devices have the "fixed BAR" capability, which means
13 * they can't be relocated or modified; check for that during
14 * BAR sizing
15 *
16 * So, we use the MCFG space for all reads and writes, but also send
17 * Lincroft writes to type 1 space. But only read/write if the device
18 * actually exists, otherwise return all 1s for reads and bit bucket
19 * the writes.
20 */
21
22#include <linux/sched.h>
23#include <linux/pci.h>
24#include <linux/ioport.h>
25#include <linux/init.h>
26#include <linux/dmi.h>
27#include <linux/acpi.h>
28#include <linux/io.h>
29#include <linux/smp.h>
30
31#include <asm/cpu_device_id.h>
32#include <asm/segment.h>
33#include <asm/pci_x86.h>
34#include <asm/hw_irq.h>
35#include <asm/io_apic.h>
36#include <asm/intel-family.h>
37#include <asm/intel-mid.h>
38#include <asm/acpi.h>
39
40#define PCIE_CAP_OFFSET 0x100
41
42/* Quirks for the listed devices */
43#define PCI_DEVICE_ID_INTEL_MRFLD_MMC 0x1190
44#define PCI_DEVICE_ID_INTEL_MRFLD_HSU 0x1191
45
46/* Fixed BAR fields */
47#define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00 /* Fixed BAR (TBD) */
48#define PCI_FIXED_BAR_0_SIZE 0x04
49#define PCI_FIXED_BAR_1_SIZE 0x08
50#define PCI_FIXED_BAR_2_SIZE 0x0c
51#define PCI_FIXED_BAR_3_SIZE 0x10
52#define PCI_FIXED_BAR_4_SIZE 0x14
53#define PCI_FIXED_BAR_5_SIZE 0x1c
54
55static int pci_soc_mode;
56
57/**
58 * fixed_bar_cap - return the offset of the fixed BAR cap if found
59 * @bus: PCI bus
60 * @devfn: device in question
61 *
62 * Look for the fixed BAR cap on @bus and @devfn, returning its offset
63 * if found or 0 otherwise.
64 */
65static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
66{
67 int pos;
68 u32 pcie_cap = 0, cap_data;
69
70 pos = PCIE_CAP_OFFSET;
71
72 if (!raw_pci_ext_ops)
73 return 0;
74
75 while (pos) {
76 if (raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
77 devfn, pos, 4, &pcie_cap))
78 return 0;
79
80 if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 ||
81 PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
82 break;
83
84 if (PCI_EXT_CAP_ID(pcie_cap) == PCI_EXT_CAP_ID_VNDR) {
85 raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
86 devfn, pos + 4, 4, &cap_data);
87 if ((cap_data & 0xffff) == PCIE_VNDR_CAP_ID_FIXED_BAR)
88 return pos;
89 }
90
91 pos = PCI_EXT_CAP_NEXT(pcie_cap);
92 }
93
94 return 0;
95}
96
97static int pci_device_update_fixed(struct pci_bus *bus, unsigned int devfn,
98 int reg, int len, u32 val, int offset)
99{
100 u32 size;
101 unsigned int domain, busnum;
102 int bar = (reg - PCI_BASE_ADDRESS_0) >> 2;
103
104 domain = pci_domain_nr(bus);
105 busnum = bus->number;
106
107 if (val == ~0 && len == 4) {
108 unsigned long decode;
109
110 raw_pci_ext_ops->read(domain, busnum, devfn,
111 offset + 8 + (bar * 4), 4, &size);
112
113 /* Turn the size into a decode pattern for the sizing code */
114 if (size) {
115 decode = size - 1;
116 decode |= decode >> 1;
117 decode |= decode >> 2;
118 decode |= decode >> 4;
119 decode |= decode >> 8;
120 decode |= decode >> 16;
121 decode++;
122 decode = ~(decode - 1);
123 } else {
124 decode = 0;
125 }
126
127 /*
128 * If val is all ones, the core code is trying to size the reg,
129 * so update the mmconfig space with the real size.
130 *
131 * Note: this assumes the fixed size we got is a power of two.
132 */
133 return raw_pci_ext_ops->write(domain, busnum, devfn, reg, 4,
134 decode);
135 }
136
137 /* This is some other kind of BAR write, so just do it. */
138 return raw_pci_ext_ops->write(domain, busnum, devfn, reg, len, val);
139}
140
141/**
142 * type1_access_ok - check whether to use type 1
143 * @bus: bus number
144 * @devfn: device & function in question
145 * @reg: configuration register offset
146 *
147 * If the bus is on a Lincroft chip and it exists, or is not on a Lincroft at
148 * all, the we can go ahead with any reads & writes. If it's on a Lincroft,
149 * but doesn't exist, avoid the access altogether to keep the chip from
150 * hanging.
151 */
152static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
153{
154 /*
155 * This is a workaround for A0 LNC bug where PCI status register does
156 * not have new CAP bit set. can not be written by SW either.
157 *
158 * PCI header type in real LNC indicates a single function device, this
159 * will prevent probing other devices under the same function in PCI
160 * shim. Therefore, use the header type in shim instead.
161 */
162 if (reg >= 0x100 || reg == PCI_STATUS || reg == PCI_HEADER_TYPE)
163 return false;
164 if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
165 || devfn == PCI_DEVFN(0, 0)
166 || devfn == PCI_DEVFN(3, 0)))
167 return true;
168 return false; /* Langwell on others */
169}
170
171static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
172 int size, u32 *value)
173{
174 if (type1_access_ok(bus->number, devfn, where))
175 return pci_direct_conf1.read(pci_domain_nr(bus), bus->number,
176 devfn, where, size, value);
177 return raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
178 devfn, where, size, value);
179}
180
181static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
182 int size, u32 value)
183{
184 int offset;
185
186 /*
187 * On MRST, there is no PCI ROM BAR, this will cause a subsequent read
188 * to ROM BAR return 0 then being ignored.
189 */
190 if (where == PCI_ROM_ADDRESS)
191 return 0;
192
193 /*
194 * Devices with fixed BARs need special handling:
195 * - BAR sizing code will save, write ~0, read size, restore
196 * - so writes to fixed BARs need special handling
197 * - other writes to fixed BAR devices should go through mmconfig
198 */
199 offset = fixed_bar_cap(bus, devfn);
200 if (offset &&
201 (where >= PCI_BASE_ADDRESS_0 && where <= PCI_BASE_ADDRESS_5)) {
202 return pci_device_update_fixed(bus, devfn, where, size, value,
203 offset);
204 }
205
206 /*
207 * On Moorestown update both real & mmconfig space
208 * Note: early Lincroft silicon can't handle type 1 accesses to
209 * non-existent devices, so just eat the write in that case.
210 */
211 if (type1_access_ok(bus->number, devfn, where))
212 return pci_direct_conf1.write(pci_domain_nr(bus), bus->number,
213 devfn, where, size, value);
214 return raw_pci_ext_ops->write(pci_domain_nr(bus), bus->number, devfn,
215 where, size, value);
216}
217
218static const struct x86_cpu_id intel_mid_cpu_ids[] = {
219 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, NULL),
220 {}
221};
222
223static int intel_mid_pci_irq_enable(struct pci_dev *dev)
224{
225 const struct x86_cpu_id *id;
226 struct irq_alloc_info info;
227 bool polarity_low;
228 u16 model = 0;
229 int ret;
230 u8 gsi;
231
232 if (dev->irq_managed && dev->irq > 0)
233 return 0;
234
235 ret = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
236 if (ret < 0) {
237 dev_warn(&dev->dev, "Failed to read interrupt line: %d\n", ret);
238 return ret;
239 }
240
241 id = x86_match_cpu(intel_mid_cpu_ids);
242 if (id)
243 model = id->model;
244
245 switch (model) {
246 case INTEL_FAM6_ATOM_SILVERMONT_MID:
247 polarity_low = false;
248
249 /* Special treatment for IRQ0 */
250 if (gsi == 0) {
251 /*
252 * Skip HS UART common registers device since it has
253 * IRQ0 assigned and not used by the kernel.
254 */
255 if (dev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU)
256 return -EBUSY;
257 /*
258 * TNG has IRQ0 assigned to eMMC controller. But there
259 * are also other devices with bogus PCI configuration
260 * that have IRQ0 assigned. This check ensures that
261 * eMMC gets it. The rest of devices still could be
262 * enabled without interrupt line being allocated.
263 */
264 if (dev->device != PCI_DEVICE_ID_INTEL_MRFLD_MMC)
265 return 0;
266 }
267 break;
268 default:
269 polarity_low = true;
270 break;
271 }
272
273 ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity_low);
274
275 /*
276 * MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
277 * IOAPIC RTE entries, so we just enable RTE for the device.
278 */
279 ret = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
280 if (ret < 0)
281 return ret;
282
283 dev->irq = ret;
284 dev->irq_managed = 1;
285
286 return 0;
287}
288
289static void intel_mid_pci_irq_disable(struct pci_dev *dev)
290{
291 if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
292 dev->irq > 0) {
293 mp_unmap_irq(dev->irq);
294 dev->irq_managed = 0;
295 }
296}
297
298static const struct pci_ops intel_mid_pci_ops __initconst = {
299 .read = pci_read,
300 .write = pci_write,
301};
302
303/**
304 * intel_mid_pci_init - installs intel_mid_pci_ops
305 *
306 * Moorestown has an interesting PCI implementation (see above).
307 * Called when the early platform detection installs it.
308 */
309int __init intel_mid_pci_init(void)
310{
311 pr_info("Intel MID platform detected, using MID PCI ops\n");
312 pci_mmcfg_late_init();
313 pcibios_enable_irq = intel_mid_pci_irq_enable;
314 pcibios_disable_irq = intel_mid_pci_irq_disable;
315 pci_root_ops = intel_mid_pci_ops;
316 pci_soc_mode = 1;
317 /* Continue with standard init */
318 acpi_noirq_set();
319 return 1;
320}
321
322/*
323 * Langwell devices are not true PCI devices; they are not subject to 10 ms
324 * d3 to d0 delay required by PCI spec.
325 */
326static void pci_d3delay_fixup(struct pci_dev *dev)
327{
328 /*
329 * PCI fixups are effectively decided compile time. If we have a dual
330 * SoC/non-SoC kernel we don't want to mangle d3 on non-SoC devices.
331 */
332 if (!pci_soc_mode)
333 return;
334 /*
335 * True PCI devices in Lincroft should allow type 1 access, the rest
336 * are Langwell fake PCI devices.
337 */
338 if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID))
339 return;
340 dev->d3hot_delay = 0;
341}
342DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup);
343
344static void mid_power_off_one_device(struct pci_dev *dev)
345{
346 u16 pmcsr;
347
348 /*
349 * Update current state first, otherwise PCI core enforces PCI_D0 in
350 * pci_set_power_state() for devices which status was PCI_UNKNOWN.
351 */
352 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
353 dev->current_state = (pci_power_t __force)(pmcsr & PCI_PM_CTRL_STATE_MASK);
354
355 pci_set_power_state(dev, PCI_D3hot);
356}
357
358static void mid_power_off_devices(struct pci_dev *dev)
359{
360 int id;
361
362 if (!pci_soc_mode)
363 return;
364
365 id = intel_mid_pwr_get_lss_id(dev);
366 if (id < 0)
367 return;
368
369 /*
370 * This sets only PMCSR bits. The actual power off will happen in
371 * arch/x86/platform/intel-mid/pwr.c.
372 */
373 mid_power_off_one_device(dev);
374}
375
376DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, mid_power_off_devices);
377
378/*
379 * Langwell devices reside at fixed offsets, don't try to move them.
380 */
381static void pci_fixed_bar_fixup(struct pci_dev *dev)
382{
383 unsigned long offset;
384 u32 size;
385 int i;
386
387 if (!pci_soc_mode)
388 return;
389
390 /* Must have extended configuration space */
391 if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
392 return;
393
394 /* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
395 offset = fixed_bar_cap(dev->bus, dev->devfn);
396 if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||
397 PCI_DEVFN(2, 2) == dev->devfn)
398 return;
399
400 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
401 pci_read_config_dword(dev, offset + 8 + (i * 4), &size);
402 dev->resource[i].end = dev->resource[i].start + size - 1;
403 dev->resource[i].flags |= IORESOURCE_PCI_FIXED;
404 }
405}
406DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixed_bar_fixup);
1/*
2 * Intel MID PCI support
3 * Copyright (c) 2008 Intel Corporation
4 * Jesse Barnes <jesse.barnes@intel.com>
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>
26#include <linux/acpi.h>
27#include <linux/io.h>
28#include <linux/smp.h>
29
30#include <asm/segment.h>
31#include <asm/pci_x86.h>
32#include <asm/hw_irq.h>
33#include <asm/io_apic.h>
34#include <asm/intel-mid.h>
35
36#define PCIE_CAP_OFFSET 0x100
37
38/* Quirks for the listed devices */
39#define PCI_DEVICE_ID_INTEL_MRFLD_MMC 0x1190
40#define PCI_DEVICE_ID_INTEL_MRFLD_HSU 0x1191
41
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
51static int pci_soc_mode;
52
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 */
61static 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;
67
68 if (!raw_pci_ext_ops)
69 return 0;
70
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
76 if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 ||
77 PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
78 break;
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
87 pos = PCI_EXT_CAP_NEXT(pcie_cap);
88 }
89
90 return 0;
91}
92
93static 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 {
120 decode = 0;
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 */
147static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
148{
149 /*
150 * This is a workaround for A0 LNC bug where PCI status register does
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)
158 return false;
159 if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
160 || devfn == PCI_DEVFN(0, 0)
161 || devfn == PCI_DEVFN(3, 0)))
162 return true;
163 return false; /* Langwell on others */
164}
165
166static 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
176static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
177 int size, u32 value)
178{
179 int offset;
180
181 /*
182 * On MRST, there is no PCI ROM BAR, this will cause a subsequent read
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
213static int intel_mid_pci_irq_enable(struct pci_dev *dev)
214{
215 struct irq_alloc_info info;
216 int polarity;
217 int ret;
218
219 if (dev->irq_managed && dev->irq > 0)
220 return 0;
221
222 switch (intel_mid_identify_cpu()) {
223 case INTEL_MID_CPU_CHIP_TANGIER:
224 polarity = IOAPIC_POL_HIGH;
225
226 /* Special treatment for IRQ0 */
227 if (dev->irq == 0) {
228 /*
229 * Skip HS UART common registers device since it has
230 * IRQ0 assigned and not used by the kernel.
231 */
232 if (dev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU)
233 return -EBUSY;
234 /*
235 * TNG has IRQ0 assigned to eMMC controller. But there
236 * are also other devices with bogus PCI configuration
237 * that have IRQ0 assigned. This check ensures that
238 * eMMC gets it. The rest of devices still could be
239 * enabled without interrupt line being allocated.
240 */
241 if (dev->device != PCI_DEVICE_ID_INTEL_MRFLD_MMC)
242 return 0;
243 }
244 break;
245 default:
246 polarity = IOAPIC_POL_LOW;
247 break;
248 }
249
250 ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity);
251
252 /*
253 * MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
254 * IOAPIC RTE entries, so we just enable RTE for the device.
255 */
256 ret = mp_map_gsi_to_irq(dev->irq, IOAPIC_MAP_ALLOC, &info);
257 if (ret < 0)
258 return ret;
259
260 dev->irq_managed = 1;
261
262 return 0;
263}
264
265static void intel_mid_pci_irq_disable(struct pci_dev *dev)
266{
267 if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
268 dev->irq > 0) {
269 mp_unmap_irq(dev->irq);
270 dev->irq_managed = 0;
271 }
272}
273
274static struct pci_ops intel_mid_pci_ops = {
275 .read = pci_read,
276 .write = pci_write,
277};
278
279/**
280 * intel_mid_pci_init - installs intel_mid_pci_ops
281 *
282 * Moorestown has an interesting PCI implementation (see above).
283 * Called when the early platform detection installs it.
284 */
285int __init intel_mid_pci_init(void)
286{
287 pr_info("Intel MID platform detected, using MID PCI ops\n");
288 pci_mmcfg_late_init();
289 pcibios_enable_irq = intel_mid_pci_irq_enable;
290 pcibios_disable_irq = intel_mid_pci_irq_disable;
291 pci_root_ops = intel_mid_pci_ops;
292 pci_soc_mode = 1;
293 /* Continue with standard init */
294 return 1;
295}
296
297/*
298 * Langwell devices are not true PCI devices; they are not subject to 10 ms
299 * d3 to d0 delay required by PCI spec.
300 */
301static void pci_d3delay_fixup(struct pci_dev *dev)
302{
303 /*
304 * PCI fixups are effectively decided compile time. If we have a dual
305 * SoC/non-SoC kernel we don't want to mangle d3 on non-SoC devices.
306 */
307 if (!pci_soc_mode)
308 return;
309 /*
310 * True PCI devices in Lincroft should allow type 1 access, the rest
311 * are Langwell fake PCI devices.
312 */
313 if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID))
314 return;
315 dev->d3_delay = 0;
316}
317DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup);
318
319static void mid_power_off_one_device(struct pci_dev *dev)
320{
321 u16 pmcsr;
322
323 /*
324 * Update current state first, otherwise PCI core enforces PCI_D0 in
325 * pci_set_power_state() for devices which status was PCI_UNKNOWN.
326 */
327 pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
328 dev->current_state = (pci_power_t __force)(pmcsr & PCI_PM_CTRL_STATE_MASK);
329
330 pci_set_power_state(dev, PCI_D3hot);
331}
332
333static void mid_power_off_devices(struct pci_dev *dev)
334{
335 int id;
336
337 if (!pci_soc_mode)
338 return;
339
340 id = intel_mid_pwr_get_lss_id(dev);
341 if (id < 0)
342 return;
343
344 /*
345 * This sets only PMCSR bits. The actual power off will happen in
346 * arch/x86/platform/intel-mid/pwr.c.
347 */
348 mid_power_off_one_device(dev);
349}
350
351DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, mid_power_off_devices);
352
353/*
354 * Langwell devices reside at fixed offsets, don't try to move them.
355 */
356static void pci_fixed_bar_fixup(struct pci_dev *dev)
357{
358 unsigned long offset;
359 u32 size;
360 int i;
361
362 if (!pci_soc_mode)
363 return;
364
365 /* Must have extended configuration space */
366 if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
367 return;
368
369 /* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
370 offset = fixed_bar_cap(dev->bus, dev->devfn);
371 if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||
372 PCI_DEVFN(2, 2) == dev->devfn)
373 return;
374
375 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
376 pci_read_config_dword(dev, offset + 8 + (i * 4), &size);
377 dev->resource[i].end = dev->resource[i].start + size - 1;
378 dev->resource[i].flags |= IORESOURCE_PCI_FIXED;
379 }
380}
381DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixed_bar_fixup);