1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MHI PCI driver - MHI over PCI controller driver
5 * This module is a generic driver for registering MHI-over-PCI devices,
6 * such as PCIe QCOM modems.
8 * Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org>
11 #include <linux/aer.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/mhi.h>
15 #include <linux/module.h>
16 #include <linux/pci.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/timer.h>
19 #include <linux/workqueue.h>
21 #define MHI_PCI_DEFAULT_BAR_NUM 0
23 #define MHI_POST_RESET_DELAY_MS 500
25 #define HEALTH_CHECK_PERIOD (HZ * 2)
28 * struct mhi_pci_dev_info - MHI PCI device specific information
29 * @config: MHI controller configuration
30 * @name: name of the PCI module
31 * @fw: firmware path (if any)
32 * @edl: emergency download mode firmware path (if any)
33 * @bar_num: PCI base address register to use for MHI MMIO register space
34 * @dma_data_width: DMA transfer word size (32 or 64 bits)
35 * @mru_default: default MRU size for MBIM network packets
36 * @sideband_wake: Devices using dedicated sideband GPIO for wakeup instead
37 * of inband wake support (such as sdx24)
39 struct mhi_pci_dev_info {
40 const struct mhi_controller_config *config;
45 unsigned int dma_data_width;
46 unsigned int mru_default;
50 #define MHI_CHANNEL_CONFIG_UL(ch_num, ch_name, el_count, ev_ring) \
54 .num_elements = el_count, \
55 .event_ring = ev_ring, \
56 .dir = DMA_TO_DEVICE, \
57 .ee_mask = BIT(MHI_EE_AMSS), \
59 .doorbell = MHI_DB_BRST_DISABLE, \
60 .lpm_notify = false, \
61 .offload_channel = false, \
62 .doorbell_mode_switch = false, \
65 #define MHI_CHANNEL_CONFIG_DL(ch_num, ch_name, el_count, ev_ring) \
69 .num_elements = el_count, \
70 .event_ring = ev_ring, \
71 .dir = DMA_FROM_DEVICE, \
72 .ee_mask = BIT(MHI_EE_AMSS), \
74 .doorbell = MHI_DB_BRST_DISABLE, \
75 .lpm_notify = false, \
76 .offload_channel = false, \
77 .doorbell_mode_switch = false, \
80 #define MHI_CHANNEL_CONFIG_DL_AUTOQUEUE(ch_num, ch_name, el_count, ev_ring) \
84 .num_elements = el_count, \
85 .event_ring = ev_ring, \
86 .dir = DMA_FROM_DEVICE, \
87 .ee_mask = BIT(MHI_EE_AMSS), \
89 .doorbell = MHI_DB_BRST_DISABLE, \
90 .lpm_notify = false, \
91 .offload_channel = false, \
92 .doorbell_mode_switch = false, \
96 #define MHI_EVENT_CONFIG_CTRL(ev_ring, el_count) \
98 .num_elements = el_count, \
99 .irq_moderation_ms = 0, \
100 .irq = (ev_ring) + 1, \
102 .mode = MHI_DB_BRST_DISABLE, \
103 .data_type = MHI_ER_CTRL, \
104 .hardware_event = false, \
105 .client_managed = false, \
106 .offload_channel = false, \
109 #define MHI_CHANNEL_CONFIG_HW_UL(ch_num, ch_name, el_count, ev_ring) \
113 .num_elements = el_count, \
114 .event_ring = ev_ring, \
115 .dir = DMA_TO_DEVICE, \
116 .ee_mask = BIT(MHI_EE_AMSS), \
118 .doorbell = MHI_DB_BRST_ENABLE, \
119 .lpm_notify = false, \
120 .offload_channel = false, \
121 .doorbell_mode_switch = true, \
124 #define MHI_CHANNEL_CONFIG_HW_DL(ch_num, ch_name, el_count, ev_ring) \
128 .num_elements = el_count, \
129 .event_ring = ev_ring, \
130 .dir = DMA_FROM_DEVICE, \
131 .ee_mask = BIT(MHI_EE_AMSS), \
133 .doorbell = MHI_DB_BRST_ENABLE, \
134 .lpm_notify = false, \
135 .offload_channel = false, \
136 .doorbell_mode_switch = true, \
139 #define MHI_CHANNEL_CONFIG_UL_SBL(ch_num, ch_name, el_count, ev_ring) \
143 .num_elements = el_count, \
144 .event_ring = ev_ring, \
145 .dir = DMA_TO_DEVICE, \
146 .ee_mask = BIT(MHI_EE_SBL), \
148 .doorbell = MHI_DB_BRST_DISABLE, \
149 .lpm_notify = false, \
150 .offload_channel = false, \
151 .doorbell_mode_switch = false, \
154 #define MHI_CHANNEL_CONFIG_DL_SBL(ch_num, ch_name, el_count, ev_ring) \
158 .num_elements = el_count, \
159 .event_ring = ev_ring, \
160 .dir = DMA_FROM_DEVICE, \
161 .ee_mask = BIT(MHI_EE_SBL), \
163 .doorbell = MHI_DB_BRST_DISABLE, \
164 .lpm_notify = false, \
165 .offload_channel = false, \
166 .doorbell_mode_switch = false, \
169 #define MHI_CHANNEL_CONFIG_UL_FP(ch_num, ch_name, el_count, ev_ring) \
173 .num_elements = el_count, \
174 .event_ring = ev_ring, \
175 .dir = DMA_TO_DEVICE, \
176 .ee_mask = BIT(MHI_EE_FP), \
178 .doorbell = MHI_DB_BRST_DISABLE, \
179 .lpm_notify = false, \
180 .offload_channel = false, \
181 .doorbell_mode_switch = false, \
184 #define MHI_CHANNEL_CONFIG_DL_FP(ch_num, ch_name, el_count, ev_ring) \
188 .num_elements = el_count, \
189 .event_ring = ev_ring, \
190 .dir = DMA_FROM_DEVICE, \
191 .ee_mask = BIT(MHI_EE_FP), \
193 .doorbell = MHI_DB_BRST_DISABLE, \
194 .lpm_notify = false, \
195 .offload_channel = false, \
196 .doorbell_mode_switch = false, \
199 #define MHI_EVENT_CONFIG_DATA(ev_ring, el_count) \
201 .num_elements = el_count, \
202 .irq_moderation_ms = 5, \
203 .irq = (ev_ring) + 1, \
205 .mode = MHI_DB_BRST_DISABLE, \
206 .data_type = MHI_ER_DATA, \
207 .hardware_event = false, \
208 .client_managed = false, \
209 .offload_channel = false, \
212 #define MHI_EVENT_CONFIG_HW_DATA(ev_ring, el_count, ch_num) \
214 .num_elements = el_count, \
215 .irq_moderation_ms = 1, \
216 .irq = (ev_ring) + 1, \
218 .mode = MHI_DB_BRST_DISABLE, \
219 .data_type = MHI_ER_DATA, \
220 .hardware_event = true, \
221 .client_managed = false, \
222 .offload_channel = false, \
226 static const struct mhi_channel_config modem_qcom_v1_mhi_channels[] = {
227 MHI_CHANNEL_CONFIG_UL(4, "DIAG", 16, 1),
228 MHI_CHANNEL_CONFIG_DL(5, "DIAG", 16, 1),
229 MHI_CHANNEL_CONFIG_UL(12, "MBIM", 4, 0),
230 MHI_CHANNEL_CONFIG_DL(13, "MBIM", 4, 0),
231 MHI_CHANNEL_CONFIG_UL(14, "QMI", 4, 0),
232 MHI_CHANNEL_CONFIG_DL(15, "QMI", 4, 0),
233 MHI_CHANNEL_CONFIG_UL(20, "IPCR", 8, 0),
234 MHI_CHANNEL_CONFIG_DL_AUTOQUEUE(21, "IPCR", 8, 0),
235 MHI_CHANNEL_CONFIG_UL_FP(34, "FIREHOSE", 32, 0),
236 MHI_CHANNEL_CONFIG_DL_FP(35, "FIREHOSE", 32, 0),
237 MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 128, 2),
238 MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 128, 3),
241 static struct mhi_event_config modem_qcom_v1_mhi_events[] = {
242 /* first ring is control+data ring */
243 MHI_EVENT_CONFIG_CTRL(0, 64),
244 /* DIAG dedicated event ring */
245 MHI_EVENT_CONFIG_DATA(1, 128),
246 /* Hardware channels request dedicated hardware event rings */
247 MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
248 MHI_EVENT_CONFIG_HW_DATA(3, 2048, 101)
251 static const struct mhi_controller_config modem_qcom_v1_mhiv_config = {
254 .num_channels = ARRAY_SIZE(modem_qcom_v1_mhi_channels),
255 .ch_cfg = modem_qcom_v1_mhi_channels,
256 .num_events = ARRAY_SIZE(modem_qcom_v1_mhi_events),
257 .event_cfg = modem_qcom_v1_mhi_events,
260 static const struct mhi_pci_dev_info mhi_qcom_sdx65_info = {
261 .name = "qcom-sdx65m",
262 .fw = "qcom/sdx65m/xbl.elf",
263 .edl = "qcom/sdx65m/edl.mbn",
264 .config = &modem_qcom_v1_mhiv_config,
265 .bar_num = MHI_PCI_DEFAULT_BAR_NUM,
266 .dma_data_width = 32,
267 .sideband_wake = false,
270 static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = {
271 .name = "qcom-sdx55m",
272 .fw = "qcom/sdx55m/sbl1.mbn",
273 .edl = "qcom/sdx55m/edl.mbn",
274 .config = &modem_qcom_v1_mhiv_config,
275 .bar_num = MHI_PCI_DEFAULT_BAR_NUM,
276 .dma_data_width = 32,
277 .mru_default = 32768,
278 .sideband_wake = false,
281 static const struct mhi_pci_dev_info mhi_qcom_sdx24_info = {
282 .name = "qcom-sdx24",
283 .edl = "qcom/prog_firehose_sdx24.mbn",
284 .config = &modem_qcom_v1_mhiv_config,
285 .bar_num = MHI_PCI_DEFAULT_BAR_NUM,
286 .dma_data_width = 32,
287 .sideband_wake = true,
290 static const struct mhi_channel_config mhi_quectel_em1xx_channels[] = {
291 MHI_CHANNEL_CONFIG_UL(0, "NMEA", 32, 0),
292 MHI_CHANNEL_CONFIG_DL(1, "NMEA", 32, 0),
293 MHI_CHANNEL_CONFIG_UL_SBL(2, "SAHARA", 32, 0),
294 MHI_CHANNEL_CONFIG_DL_SBL(3, "SAHARA", 32, 0),
295 MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 1),
296 MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 1),
297 MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0),
298 MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0),
299 MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0),
300 MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0),
301 /* The EDL firmware is a flash-programmer exposing firehose protocol */
302 MHI_CHANNEL_CONFIG_UL_FP(34, "FIREHOSE", 32, 0),
303 MHI_CHANNEL_CONFIG_DL_FP(35, "FIREHOSE", 32, 0),
304 MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 128, 2),
305 MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3),
308 static struct mhi_event_config mhi_quectel_em1xx_events[] = {
309 MHI_EVENT_CONFIG_CTRL(0, 128),
310 MHI_EVENT_CONFIG_DATA(1, 128),
311 MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
312 MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101)
315 static const struct mhi_controller_config modem_quectel_em1xx_config = {
318 .num_channels = ARRAY_SIZE(mhi_quectel_em1xx_channels),
319 .ch_cfg = mhi_quectel_em1xx_channels,
320 .num_events = ARRAY_SIZE(mhi_quectel_em1xx_events),
321 .event_cfg = mhi_quectel_em1xx_events,
324 static const struct mhi_pci_dev_info mhi_quectel_em1xx_info = {
325 .name = "quectel-em1xx",
326 .edl = "qcom/prog_firehose_sdx24.mbn",
327 .config = &modem_quectel_em1xx_config,
328 .bar_num = MHI_PCI_DEFAULT_BAR_NUM,
329 .dma_data_width = 32,
330 .sideband_wake = true,
333 static const struct mhi_channel_config mhi_foxconn_sdx55_channels[] = {
334 MHI_CHANNEL_CONFIG_UL(0, "LOOPBACK", 32, 0),
335 MHI_CHANNEL_CONFIG_DL(1, "LOOPBACK", 32, 0),
336 MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 1),
337 MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 1),
338 MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0),
339 MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0),
340 MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0),
341 MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0),
342 MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 128, 2),
343 MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3),
346 static struct mhi_event_config mhi_foxconn_sdx55_events[] = {
347 MHI_EVENT_CONFIG_CTRL(0, 128),
348 MHI_EVENT_CONFIG_DATA(1, 128),
349 MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
350 MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101)
353 static const struct mhi_controller_config modem_foxconn_sdx55_config = {
356 .num_channels = ARRAY_SIZE(mhi_foxconn_sdx55_channels),
357 .ch_cfg = mhi_foxconn_sdx55_channels,
358 .num_events = ARRAY_SIZE(mhi_foxconn_sdx55_events),
359 .event_cfg = mhi_foxconn_sdx55_events,
362 static const struct mhi_pci_dev_info mhi_foxconn_sdx55_info = {
363 .name = "foxconn-sdx55",
364 .fw = "qcom/sdx55m/sbl1.mbn",
365 .edl = "qcom/sdx55m/edl.mbn",
366 .config = &modem_foxconn_sdx55_config,
367 .bar_num = MHI_PCI_DEFAULT_BAR_NUM,
368 .dma_data_width = 32,
369 .sideband_wake = false,
372 static const struct pci_device_id mhi_pci_id_table[] = {
373 { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306),
374 .driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info },
375 { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0304),
376 .driver_data = (kernel_ulong_t) &mhi_qcom_sdx24_info },
377 { PCI_DEVICE(0x1eac, 0x1001), /* EM120R-GL (sdx24) */
378 .driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info },
379 { PCI_DEVICE(0x1eac, 0x1002), /* EM160R-GL (sdx24) */
380 .driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info },
381 { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0308),
382 .driver_data = (kernel_ulong_t) &mhi_qcom_sdx65_info },
383 /* T99W175 (sdx55), Both for eSIM and Non-eSIM */
384 { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0ab),
385 .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info },
386 /* DW5930e (sdx55), With eSIM, It's also T99W175 */
387 { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0b0),
388 .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info },
389 /* DW5930e (sdx55), Non-eSIM, It's also T99W175 */
390 { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0b1),
391 .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info },
394 MODULE_DEVICE_TABLE(pci, mhi_pci_id_table);
396 enum mhi_pci_device_status {
398 MHI_PCI_DEV_SUSPENDED,
401 struct mhi_pci_device {
402 struct mhi_controller mhi_cntrl;
403 struct pci_saved_state *pci_state;
404 struct work_struct recovery_work;
405 struct timer_list health_check_timer;
406 unsigned long status;
409 static int mhi_pci_read_reg(struct mhi_controller *mhi_cntrl,
410 void __iomem *addr, u32 *out)
416 static void mhi_pci_write_reg(struct mhi_controller *mhi_cntrl,
417 void __iomem *addr, u32 val)
422 static void mhi_pci_status_cb(struct mhi_controller *mhi_cntrl,
423 enum mhi_callback cb)
425 struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
427 /* Nothing to do for now */
429 case MHI_CB_FATAL_ERROR:
430 case MHI_CB_SYS_ERROR:
431 dev_warn(&pdev->dev, "firmware crashed (%u)\n", cb);
432 pm_runtime_forbid(&pdev->dev);
434 case MHI_CB_EE_MISSION_MODE:
435 pm_runtime_allow(&pdev->dev);
442 static void mhi_pci_wake_get_nop(struct mhi_controller *mhi_cntrl, bool force)
447 static void mhi_pci_wake_put_nop(struct mhi_controller *mhi_cntrl, bool override)
452 static void mhi_pci_wake_toggle_nop(struct mhi_controller *mhi_cntrl)
457 static bool mhi_pci_is_alive(struct mhi_controller *mhi_cntrl)
459 struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
462 if (pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor))
465 if (vendor == (u16) ~0 || vendor == 0)
471 static int mhi_pci_claim(struct mhi_controller *mhi_cntrl,
472 unsigned int bar_num, u64 dma_mask)
474 struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
477 err = pci_assign_resource(pdev, bar_num);
481 err = pcim_enable_device(pdev);
483 dev_err(&pdev->dev, "failed to enable pci device: %d\n", err);
487 err = pcim_iomap_regions(pdev, 1 << bar_num, pci_name(pdev));
489 dev_err(&pdev->dev, "failed to map pci region: %d\n", err);
492 mhi_cntrl->regs = pcim_iomap_table(pdev)[bar_num];
494 err = pci_set_dma_mask(pdev, dma_mask);
496 dev_err(&pdev->dev, "Cannot set proper DMA mask\n");
500 err = pci_set_consistent_dma_mask(pdev, dma_mask);
502 dev_err(&pdev->dev, "set consistent dma mask failed\n");
506 pci_set_master(pdev);
511 static int mhi_pci_get_irqs(struct mhi_controller *mhi_cntrl,
512 const struct mhi_controller_config *mhi_cntrl_config)
514 struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
519 * Alloc one MSI vector for BHI + one vector per event ring, ideally...
520 * No explicit pci_free_irq_vectors required, done by pcim_release.
522 mhi_cntrl->nr_irqs = 1 + mhi_cntrl_config->num_events;
524 nr_vectors = pci_alloc_irq_vectors(pdev, 1, mhi_cntrl->nr_irqs, PCI_IRQ_MSI);
525 if (nr_vectors < 0) {
526 dev_err(&pdev->dev, "Error allocating MSI vectors %d\n",
531 if (nr_vectors < mhi_cntrl->nr_irqs) {
532 dev_warn(&pdev->dev, "using shared MSI\n");
534 /* Patch msi vectors, use only one (shared) */
535 for (i = 0; i < mhi_cntrl_config->num_events; i++)
536 mhi_cntrl_config->event_cfg[i].irq = 0;
537 mhi_cntrl->nr_irqs = 1;
540 irq = devm_kcalloc(&pdev->dev, mhi_cntrl->nr_irqs, sizeof(int), GFP_KERNEL);
544 for (i = 0; i < mhi_cntrl->nr_irqs; i++) {
545 int vector = i >= nr_vectors ? (nr_vectors - 1) : i;
547 irq[i] = pci_irq_vector(pdev, vector);
550 mhi_cntrl->irq = irq;
555 static int mhi_pci_runtime_get(struct mhi_controller *mhi_cntrl)
557 /* The runtime_get() MHI callback means:
558 * Do whatever is requested to leave M3.
560 return pm_runtime_get(mhi_cntrl->cntrl_dev);
563 static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl)
565 /* The runtime_put() MHI callback means:
566 * Device can be moved in M3 state.
568 pm_runtime_mark_last_busy(mhi_cntrl->cntrl_dev);
569 pm_runtime_put(mhi_cntrl->cntrl_dev);
572 static void mhi_pci_recovery_work(struct work_struct *work)
574 struct mhi_pci_device *mhi_pdev = container_of(work, struct mhi_pci_device,
576 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
577 struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
580 dev_warn(&pdev->dev, "device recovery started\n");
582 del_timer(&mhi_pdev->health_check_timer);
583 pm_runtime_forbid(&pdev->dev);
585 /* Clean up MHI state */
586 if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
587 mhi_power_down(mhi_cntrl, false);
588 mhi_unprepare_after_power_down(mhi_cntrl);
591 pci_set_power_state(pdev, PCI_D0);
592 pci_load_saved_state(pdev, mhi_pdev->pci_state);
593 pci_restore_state(pdev);
595 if (!mhi_pci_is_alive(mhi_cntrl))
598 err = mhi_prepare_for_power_up(mhi_cntrl);
602 err = mhi_sync_power_up(mhi_cntrl);
606 dev_dbg(&pdev->dev, "Recovery completed\n");
608 set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status);
609 mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
613 mhi_unprepare_after_power_down(mhi_cntrl);
615 if (pci_reset_function(pdev))
616 dev_err(&pdev->dev, "Recovery failed\n");
619 static void health_check(struct timer_list *t)
621 struct mhi_pci_device *mhi_pdev = from_timer(mhi_pdev, t, health_check_timer);
622 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
624 if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) ||
625 test_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status))
628 if (!mhi_pci_is_alive(mhi_cntrl)) {
629 dev_err(mhi_cntrl->cntrl_dev, "Device died\n");
630 queue_work(system_long_wq, &mhi_pdev->recovery_work);
634 /* reschedule in two seconds */
635 mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
638 static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
640 const struct mhi_pci_dev_info *info = (struct mhi_pci_dev_info *) id->driver_data;
641 const struct mhi_controller_config *mhi_cntrl_config;
642 struct mhi_pci_device *mhi_pdev;
643 struct mhi_controller *mhi_cntrl;
646 dev_dbg(&pdev->dev, "MHI PCI device found: %s\n", info->name);
648 /* mhi_pdev.mhi_cntrl must be zero-initialized */
649 mhi_pdev = devm_kzalloc(&pdev->dev, sizeof(*mhi_pdev), GFP_KERNEL);
653 INIT_WORK(&mhi_pdev->recovery_work, mhi_pci_recovery_work);
654 timer_setup(&mhi_pdev->health_check_timer, health_check, 0);
656 mhi_cntrl_config = info->config;
657 mhi_cntrl = &mhi_pdev->mhi_cntrl;
659 mhi_cntrl->cntrl_dev = &pdev->dev;
660 mhi_cntrl->iova_start = 0;
661 mhi_cntrl->iova_stop = (dma_addr_t)DMA_BIT_MASK(info->dma_data_width);
662 mhi_cntrl->fw_image = info->fw;
663 mhi_cntrl->edl_image = info->edl;
665 mhi_cntrl->read_reg = mhi_pci_read_reg;
666 mhi_cntrl->write_reg = mhi_pci_write_reg;
667 mhi_cntrl->status_cb = mhi_pci_status_cb;
668 mhi_cntrl->runtime_get = mhi_pci_runtime_get;
669 mhi_cntrl->runtime_put = mhi_pci_runtime_put;
670 mhi_cntrl->mru = info->mru_default;
672 if (info->sideband_wake) {
673 mhi_cntrl->wake_get = mhi_pci_wake_get_nop;
674 mhi_cntrl->wake_put = mhi_pci_wake_put_nop;
675 mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop;
678 err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width));
682 err = mhi_pci_get_irqs(mhi_cntrl, mhi_cntrl_config);
686 pci_set_drvdata(pdev, mhi_pdev);
688 /* Have stored pci confspace at hand for restore in sudden PCI error.
689 * cache the state locally and discard the PCI core one.
691 pci_save_state(pdev);
692 mhi_pdev->pci_state = pci_store_saved_state(pdev);
693 pci_load_saved_state(pdev, NULL);
695 pci_enable_pcie_error_reporting(pdev);
697 err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config);
699 goto err_disable_reporting;
701 /* MHI bus does not power up the controller by default */
702 err = mhi_prepare_for_power_up(mhi_cntrl);
704 dev_err(&pdev->dev, "failed to prepare MHI controller\n");
708 err = mhi_sync_power_up(mhi_cntrl);
710 dev_err(&pdev->dev, "failed to power up MHI controller\n");
714 set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status);
716 /* start health check */
717 mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
719 /* Only allow runtime-suspend if PME capable (for wakeup) */
720 if (pci_pme_capable(pdev, PCI_D3hot)) {
721 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
722 pm_runtime_use_autosuspend(&pdev->dev);
723 pm_runtime_mark_last_busy(&pdev->dev);
724 pm_runtime_put_noidle(&pdev->dev);
730 mhi_unprepare_after_power_down(mhi_cntrl);
732 mhi_unregister_controller(mhi_cntrl);
733 err_disable_reporting:
734 pci_disable_pcie_error_reporting(pdev);
739 static void mhi_pci_remove(struct pci_dev *pdev)
741 struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
742 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
744 del_timer_sync(&mhi_pdev->health_check_timer);
745 cancel_work_sync(&mhi_pdev->recovery_work);
747 if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
748 mhi_power_down(mhi_cntrl, true);
749 mhi_unprepare_after_power_down(mhi_cntrl);
752 /* balancing probe put_noidle */
753 if (pci_pme_capable(pdev, PCI_D3hot))
754 pm_runtime_get_noresume(&pdev->dev);
756 mhi_unregister_controller(mhi_cntrl);
757 pci_disable_pcie_error_reporting(pdev);
760 static void mhi_pci_shutdown(struct pci_dev *pdev)
762 mhi_pci_remove(pdev);
763 pci_set_power_state(pdev, PCI_D3hot);
766 static void mhi_pci_reset_prepare(struct pci_dev *pdev)
768 struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
769 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
771 dev_info(&pdev->dev, "reset\n");
773 del_timer(&mhi_pdev->health_check_timer);
775 /* Clean up MHI state */
776 if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
777 mhi_power_down(mhi_cntrl, false);
778 mhi_unprepare_after_power_down(mhi_cntrl);
781 /* cause internal device reset */
782 mhi_soc_reset(mhi_cntrl);
784 /* Be sure device reset has been executed */
785 msleep(MHI_POST_RESET_DELAY_MS);
788 static void mhi_pci_reset_done(struct pci_dev *pdev)
790 struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
791 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
794 /* Restore initial known working PCI state */
795 pci_load_saved_state(pdev, mhi_pdev->pci_state);
796 pci_restore_state(pdev);
798 /* Is device status available ? */
799 if (!mhi_pci_is_alive(mhi_cntrl)) {
800 dev_err(&pdev->dev, "reset failed\n");
804 err = mhi_prepare_for_power_up(mhi_cntrl);
806 dev_err(&pdev->dev, "failed to prepare MHI controller\n");
810 err = mhi_sync_power_up(mhi_cntrl);
812 dev_err(&pdev->dev, "failed to power up MHI controller\n");
813 mhi_unprepare_after_power_down(mhi_cntrl);
817 set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status);
818 mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
821 static pci_ers_result_t mhi_pci_error_detected(struct pci_dev *pdev,
822 pci_channel_state_t state)
824 struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
825 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
827 dev_err(&pdev->dev, "PCI error detected, state = %u\n", state);
829 if (state == pci_channel_io_perm_failure)
830 return PCI_ERS_RESULT_DISCONNECT;
832 /* Clean up MHI state */
833 if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
834 mhi_power_down(mhi_cntrl, false);
835 mhi_unprepare_after_power_down(mhi_cntrl);
838 return PCI_ERS_RESULT_RECOVERED;
841 pci_disable_device(pdev);
843 return PCI_ERS_RESULT_NEED_RESET;
846 static pci_ers_result_t mhi_pci_slot_reset(struct pci_dev *pdev)
848 if (pci_enable_device(pdev)) {
849 dev_err(&pdev->dev, "Cannot re-enable PCI device after reset.\n");
850 return PCI_ERS_RESULT_DISCONNECT;
853 return PCI_ERS_RESULT_RECOVERED;
856 static void mhi_pci_io_resume(struct pci_dev *pdev)
858 struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
860 dev_err(&pdev->dev, "PCI slot reset done\n");
862 queue_work(system_long_wq, &mhi_pdev->recovery_work);
865 static const struct pci_error_handlers mhi_pci_err_handler = {
866 .error_detected = mhi_pci_error_detected,
867 .slot_reset = mhi_pci_slot_reset,
868 .resume = mhi_pci_io_resume,
869 .reset_prepare = mhi_pci_reset_prepare,
870 .reset_done = mhi_pci_reset_done,
873 static int __maybe_unused mhi_pci_runtime_suspend(struct device *dev)
875 struct pci_dev *pdev = to_pci_dev(dev);
876 struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
877 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
880 if (test_and_set_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status))
883 del_timer(&mhi_pdev->health_check_timer);
884 cancel_work_sync(&mhi_pdev->recovery_work);
886 if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) ||
887 mhi_cntrl->ee != MHI_EE_AMSS)
888 goto pci_suspend; /* Nothing to do at MHI level */
890 /* Transition to M3 state */
891 err = mhi_pm_suspend(mhi_cntrl);
893 dev_err(&pdev->dev, "failed to suspend device: %d\n", err);
894 clear_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status);
899 pci_disable_device(pdev);
900 pci_wake_from_d3(pdev, true);
905 static int __maybe_unused mhi_pci_runtime_resume(struct device *dev)
907 struct pci_dev *pdev = to_pci_dev(dev);
908 struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
909 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
912 if (!test_and_clear_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status))
915 err = pci_enable_device(pdev);
919 pci_set_master(pdev);
920 pci_wake_from_d3(pdev, false);
922 if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) ||
923 mhi_cntrl->ee != MHI_EE_AMSS)
924 return 0; /* Nothing to do at MHI level */
926 /* Exit M3, transition to M0 state */
927 err = mhi_pm_resume(mhi_cntrl);
929 dev_err(&pdev->dev, "failed to resume device: %d\n", err);
933 /* Resume health check */
934 mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD);
936 /* It can be a remote wakeup (no mhi runtime_get), update access time */
937 pm_runtime_mark_last_busy(dev);
942 /* Do not fail to not mess up our PCI device state, the device likely
943 * lost power (d3cold) and we simply need to reset it from the recovery
944 * procedure, trigger the recovery asynchronously to prevent system
945 * suspend exit delaying.
947 queue_work(system_long_wq, &mhi_pdev->recovery_work);
948 pm_runtime_mark_last_busy(dev);
953 static int __maybe_unused mhi_pci_suspend(struct device *dev)
955 pm_runtime_disable(dev);
956 return mhi_pci_runtime_suspend(dev);
959 static int __maybe_unused mhi_pci_resume(struct device *dev)
963 /* Depending the platform, device may have lost power (d3cold), we need
964 * to resume it now to check its state and recover when necessary.
966 ret = mhi_pci_runtime_resume(dev);
967 pm_runtime_enable(dev);
972 static int __maybe_unused mhi_pci_freeze(struct device *dev)
974 struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
975 struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
977 /* We want to stop all operations, hibernation does not guarantee that
978 * device will be in the same state as before freezing, especially if
979 * the intermediate restore kernel reinitializes MHI device with new
982 if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
983 mhi_power_down(mhi_cntrl, false);
984 mhi_unprepare_after_power_down(mhi_cntrl);
990 static int __maybe_unused mhi_pci_restore(struct device *dev)
992 struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev);
994 /* Reinitialize the device */
995 queue_work(system_long_wq, &mhi_pdev->recovery_work);
1000 static const struct dev_pm_ops mhi_pci_pm_ops = {
1001 SET_RUNTIME_PM_OPS(mhi_pci_runtime_suspend, mhi_pci_runtime_resume, NULL)
1002 #ifdef CONFIG_PM_SLEEP
1003 .suspend = mhi_pci_suspend,
1004 .resume = mhi_pci_resume,
1005 .freeze = mhi_pci_freeze,
1006 .thaw = mhi_pci_restore,
1007 .restore = mhi_pci_restore,
1011 static struct pci_driver mhi_pci_driver = {
1012 .name = "mhi-pci-generic",
1013 .id_table = mhi_pci_id_table,
1014 .probe = mhi_pci_probe,
1015 .remove = mhi_pci_remove,
1016 .shutdown = mhi_pci_shutdown,
1017 .err_handler = &mhi_pci_err_handler,
1018 .driver.pm = &mhi_pci_pm_ops
1020 module_pci_driver(mhi_pci_driver);
1022 MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
1023 MODULE_DESCRIPTION("Modem Host Interface (MHI) PCI controller driver");
1024 MODULE_LICENSE("GPL");