1 // SPDX-License-Identifier: GPL-2.0
3 * Qualcomm PCIe Endpoint controller driver
5 * Copyright (c) 2020, The Linux Foundation. All rights reserved.
8 * Copyright (c) 2021, Linaro Ltd.
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/mfd/syscon.h>
16 #include <linux/phy/phy.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_domain.h>
19 #include <linux/regmap.h>
20 #include <linux/reset.h>
21 #include <linux/module.h>
23 #include "pcie-designware.h"
26 #define PARF_SYS_CTRL 0x00
27 #define PARF_DB_CTRL 0x10
28 #define PARF_PM_CTRL 0x20
29 #define PARF_MHI_BASE_ADDR_LOWER 0x178
30 #define PARF_MHI_BASE_ADDR_UPPER 0x17c
31 #define PARF_DEBUG_INT_EN 0x190
32 #define PARF_AXI_MSTR_RD_HALT_NO_WRITES 0x1a4
33 #define PARF_AXI_MSTR_WR_ADDR_HALT 0x1a8
34 #define PARF_Q2A_FLUSH 0x1ac
35 #define PARF_LTSSM 0x1b0
36 #define PARF_CFG_BITS 0x210
37 #define PARF_INT_ALL_STATUS 0x224
38 #define PARF_INT_ALL_CLEAR 0x228
39 #define PARF_INT_ALL_MASK 0x22c
40 #define PARF_SLV_ADDR_MSB_CTRL 0x2c0
41 #define PARF_DBI_BASE_ADDR 0x350
42 #define PARF_DBI_BASE_ADDR_HI 0x354
43 #define PARF_SLV_ADDR_SPACE_SIZE 0x358
44 #define PARF_SLV_ADDR_SPACE_SIZE_HI 0x35c
45 #define PARF_ATU_BASE_ADDR 0x634
46 #define PARF_ATU_BASE_ADDR_HI 0x638
47 #define PARF_SRIS_MODE 0x644
48 #define PARF_DEVICE_TYPE 0x1000
49 #define PARF_BDF_TO_SID_CFG 0x2c00
51 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
52 #define PARF_INT_ALL_LINK_DOWN BIT(1)
53 #define PARF_INT_ALL_BME BIT(2)
54 #define PARF_INT_ALL_PM_TURNOFF BIT(3)
55 #define PARF_INT_ALL_DEBUG BIT(4)
56 #define PARF_INT_ALL_LTR BIT(5)
57 #define PARF_INT_ALL_MHI_Q6 BIT(6)
58 #define PARF_INT_ALL_MHI_A7 BIT(7)
59 #define PARF_INT_ALL_DSTATE_CHANGE BIT(8)
60 #define PARF_INT_ALL_L1SUB_TIMEOUT BIT(9)
61 #define PARF_INT_ALL_MMIO_WRITE BIT(10)
62 #define PARF_INT_ALL_CFG_WRITE BIT(11)
63 #define PARF_INT_ALL_BRIDGE_FLUSH_N BIT(12)
64 #define PARF_INT_ALL_LINK_UP BIT(13)
65 #define PARF_INT_ALL_AER_LEGACY BIT(14)
66 #define PARF_INT_ALL_PLS_ERR BIT(15)
67 #define PARF_INT_ALL_PME_LEGACY BIT(16)
68 #define PARF_INT_ALL_PLS_PME BIT(17)
70 /* PARF_BDF_TO_SID_CFG register fields */
71 #define PARF_BDF_TO_SID_BYPASS BIT(0)
73 /* PARF_DEBUG_INT_EN register fields */
74 #define PARF_DEBUG_INT_PM_DSTATE_CHANGE BIT(1)
75 #define PARF_DEBUG_INT_CFG_BUS_MASTER_EN BIT(2)
76 #define PARF_DEBUG_INT_RADM_PM_TURNOFF BIT(3)
78 /* PARF_DEVICE_TYPE register fields */
79 #define PARF_DEVICE_TYPE_EP 0x0
81 /* PARF_PM_CTRL register fields */
82 #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1)
83 #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2)
84 #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5)
86 /* PARF_AXI_MSTR_RD_HALT_NO_WRITES register fields */
87 #define PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN BIT(0)
89 /* PARF_AXI_MSTR_WR_ADDR_HALT register fields */
90 #define PARF_AXI_MSTR_WR_ADDR_HALT_EN BIT(31)
92 /* PARF_Q2A_FLUSH register fields */
93 #define PARF_Q2A_FLUSH_EN BIT(16)
95 /* PARF_SYS_CTRL register fields */
96 #define PARF_SYS_CTRL_AUX_PWR_DET BIT(4)
97 #define PARF_SYS_CTRL_CORE_CLK_CGC_DIS BIT(6)
98 #define PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE BIT(11)
100 /* PARF_DB_CTRL register fields */
101 #define PARF_DB_CTRL_INSR_DBNCR_BLOCK BIT(0)
102 #define PARF_DB_CTRL_RMVL_DBNCR_BLOCK BIT(1)
103 #define PARF_DB_CTRL_DBI_WKP_BLOCK BIT(4)
104 #define PARF_DB_CTRL_SLV_WKP_BLOCK BIT(5)
105 #define PARF_DB_CTRL_MST_WKP_BLOCK BIT(6)
107 /* PARF_CFG_BITS register fields */
108 #define PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN BIT(1)
111 #define ELBI_SYS_STTS 0x08
114 #define DBI_CON_STATUS 0x44
116 /* DBI register fields */
117 #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0)
119 #define XMLH_LINK_UP 0x400
120 #define CORE_RESET_TIME_US_MIN 1000
121 #define CORE_RESET_TIME_US_MAX 1005
122 #define WAKE_DELAY_US 2000 /* 2 ms */
124 #define to_pcie_ep(x) dev_get_drvdata((x)->dev)
126 enum qcom_pcie_ep_link_status {
127 QCOM_PCIE_EP_LINK_DISABLED,
128 QCOM_PCIE_EP_LINK_ENABLED,
129 QCOM_PCIE_EP_LINK_UP,
130 QCOM_PCIE_EP_LINK_DOWN,
133 static struct clk_bulk_data qcom_pcie_ep_clks[] = {
136 { .id = "bus_master" },
137 { .id = "bus_slave" },
140 { .id = "slave_q2a" },
143 struct qcom_pcie_ep {
148 struct regmap *perst_map;
149 struct resource *mmio_res;
151 struct reset_control *core_reset;
152 struct gpio_desc *reset;
153 struct gpio_desc *wake;
159 enum qcom_pcie_ep_link_status link_status;
164 static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep)
166 struct dw_pcie *pci = &pcie_ep->pci;
167 struct device *dev = pci->dev;
170 ret = reset_control_assert(pcie_ep->core_reset);
172 dev_err(dev, "Cannot assert core reset\n");
176 usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX);
178 ret = reset_control_deassert(pcie_ep->core_reset);
180 dev_err(dev, "Cannot de-assert core reset\n");
184 usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX);
190 * Delatch PERST_EN and PERST_SEPARATION_ENABLE with TCSR to avoid
191 * device reset during host reboot and hibernation. The driver is
192 * expected to handle this situation.
194 static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep)
196 regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0);
197 regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0);
200 static int qcom_pcie_dw_link_up(struct dw_pcie *pci)
202 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
205 reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS);
207 return reg & XMLH_LINK_UP;
210 static int qcom_pcie_dw_start_link(struct dw_pcie *pci)
212 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
214 enable_irq(pcie_ep->perst_irq);
219 static void qcom_pcie_dw_stop_link(struct dw_pcie *pci)
221 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
223 disable_irq(pcie_ep->perst_irq);
226 static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
228 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
229 struct device *dev = pci->dev;
233 ret = clk_bulk_prepare_enable(ARRAY_SIZE(qcom_pcie_ep_clks),
238 ret = qcom_pcie_ep_core_reset(pcie_ep);
240 goto err_disable_clk;
242 ret = phy_init(pcie_ep->phy);
244 goto err_disable_clk;
246 ret = phy_power_on(pcie_ep->phy);
250 /* Assert WAKE# to RC to indicate device is ready */
251 gpiod_set_value_cansleep(pcie_ep->wake, 1);
252 usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500);
253 gpiod_set_value_cansleep(pcie_ep->wake, 0);
255 qcom_pcie_ep_configure_tcsr(pcie_ep);
257 /* Disable BDF to SID mapping */
258 val = readl_relaxed(pcie_ep->parf + PARF_BDF_TO_SID_CFG);
259 val |= PARF_BDF_TO_SID_BYPASS;
260 writel_relaxed(val, pcie_ep->parf + PARF_BDF_TO_SID_CFG);
262 /* Enable debug IRQ */
263 val = readl_relaxed(pcie_ep->parf + PARF_DEBUG_INT_EN);
264 val |= PARF_DEBUG_INT_RADM_PM_TURNOFF |
265 PARF_DEBUG_INT_CFG_BUS_MASTER_EN |
266 PARF_DEBUG_INT_PM_DSTATE_CHANGE;
267 writel_relaxed(val, pcie_ep->parf + PARF_DEBUG_INT_EN);
269 /* Configure PCIe to endpoint mode */
270 writel_relaxed(PARF_DEVICE_TYPE_EP, pcie_ep->parf + PARF_DEVICE_TYPE);
272 /* Allow entering L1 state */
273 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
274 val &= ~PARF_PM_CTRL_REQ_NOT_ENTR_L1;
275 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
277 /* Read halts write */
278 val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES);
279 val &= ~PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN;
280 writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES);
282 /* Write after write halt */
283 val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
284 val |= PARF_AXI_MSTR_WR_ADDR_HALT_EN;
285 writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
287 /* Q2A flush disable */
288 val = readl_relaxed(pcie_ep->parf + PARF_Q2A_FLUSH);
289 val &= ~PARF_Q2A_FLUSH_EN;
290 writel_relaxed(val, pcie_ep->parf + PARF_Q2A_FLUSH);
292 /* Disable DBI Wakeup, core clock CGC and enable AUX power */
293 val = readl_relaxed(pcie_ep->parf + PARF_SYS_CTRL);
294 val |= PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE |
295 PARF_SYS_CTRL_CORE_CLK_CGC_DIS |
296 PARF_SYS_CTRL_AUX_PWR_DET;
297 writel_relaxed(val, pcie_ep->parf + PARF_SYS_CTRL);
299 /* Disable the debouncers */
300 val = readl_relaxed(pcie_ep->parf + PARF_DB_CTRL);
301 val |= PARF_DB_CTRL_INSR_DBNCR_BLOCK | PARF_DB_CTRL_RMVL_DBNCR_BLOCK |
302 PARF_DB_CTRL_DBI_WKP_BLOCK | PARF_DB_CTRL_SLV_WKP_BLOCK |
303 PARF_DB_CTRL_MST_WKP_BLOCK;
304 writel_relaxed(val, pcie_ep->parf + PARF_DB_CTRL);
306 /* Request to exit from L1SS for MSI and LTR MSG */
307 val = readl_relaxed(pcie_ep->parf + PARF_CFG_BITS);
308 val |= PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN;
309 writel_relaxed(val, pcie_ep->parf + PARF_CFG_BITS);
311 dw_pcie_dbi_ro_wr_en(pci);
313 /* Set the L0s Exit Latency to 2us-4us = 0x6 */
314 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
315 val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
316 val &= ~PCI_EXP_LNKCAP_L0SEL;
317 val |= FIELD_PREP(PCI_EXP_LNKCAP_L0SEL, 0x6);
318 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val);
320 /* Set the L1 Exit Latency to be 32us-64 us = 0x6 */
321 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
322 val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
323 val &= ~PCI_EXP_LNKCAP_L1EL;
324 val |= FIELD_PREP(PCI_EXP_LNKCAP_L1EL, 0x6);
325 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val);
327 dw_pcie_dbi_ro_wr_dis(pci);
329 writel_relaxed(0, pcie_ep->parf + PARF_INT_ALL_MASK);
330 val = PARF_INT_ALL_LINK_DOWN | PARF_INT_ALL_BME |
331 PARF_INT_ALL_PM_TURNOFF | PARF_INT_ALL_DSTATE_CHANGE |
332 PARF_INT_ALL_LINK_UP;
333 writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK);
335 ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep);
337 dev_err(dev, "Failed to complete initialization: %d\n", ret);
338 goto err_phy_power_off;
342 * The physical address of the MMIO region which is exposed as the BAR
343 * should be written to MHI BASE registers.
345 writel_relaxed(pcie_ep->mmio_res->start,
346 pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER);
347 writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER);
349 dw_pcie_ep_init_notify(&pcie_ep->pci.ep);
352 val = readl_relaxed(pcie_ep->parf + PARF_LTSSM);
354 writel_relaxed(val, pcie_ep->parf + PARF_LTSSM);
359 phy_power_off(pcie_ep->phy);
361 phy_exit(pcie_ep->phy);
363 clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks),
369 static void qcom_pcie_perst_assert(struct dw_pcie *pci)
371 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
372 struct device *dev = pci->dev;
374 if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) {
375 dev_dbg(dev, "Link is already disabled\n");
379 phy_power_off(pcie_ep->phy);
380 phy_exit(pcie_ep->phy);
381 clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks),
383 pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;
386 /* Common DWC controller ops */
387 static const struct dw_pcie_ops pci_ops = {
388 .link_up = qcom_pcie_dw_link_up,
389 .start_link = qcom_pcie_dw_start_link,
390 .stop_link = qcom_pcie_dw_stop_link,
393 static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev,
394 struct qcom_pcie_ep *pcie_ep)
396 struct device *dev = &pdev->dev;
397 struct dw_pcie *pci = &pcie_ep->pci;
398 struct device_node *syscon;
399 struct resource *res;
402 pcie_ep->parf = devm_platform_ioremap_resource_byname(pdev, "parf");
403 if (IS_ERR(pcie_ep->parf))
404 return PTR_ERR(pcie_ep->parf);
406 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
407 pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
408 if (IS_ERR(pci->dbi_base))
409 return PTR_ERR(pci->dbi_base);
410 pci->dbi_base2 = pci->dbi_base;
412 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
413 pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res);
414 if (IS_ERR(pcie_ep->elbi))
415 return PTR_ERR(pcie_ep->elbi);
417 pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
420 syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0);
422 dev_err(dev, "Failed to parse qcom,perst-regs\n");
426 pcie_ep->perst_map = syscon_node_to_regmap(syscon);
428 if (IS_ERR(pcie_ep->perst_map))
429 return PTR_ERR(pcie_ep->perst_map);
431 ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs",
432 1, &pcie_ep->perst_en);
434 dev_err(dev, "No Perst Enable offset in syscon\n");
438 ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs",
439 2, &pcie_ep->perst_sep_en);
441 dev_err(dev, "No Perst Separation Enable offset in syscon\n");
448 static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
449 struct qcom_pcie_ep *pcie_ep)
451 struct device *dev = &pdev->dev;
454 ret = qcom_pcie_ep_get_io_resources(pdev, pcie_ep);
456 dev_err(&pdev->dev, "Failed to get io resources %d\n", ret);
460 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(qcom_pcie_ep_clks),
465 pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core");
466 if (IS_ERR(pcie_ep->core_reset))
467 return PTR_ERR(pcie_ep->core_reset);
469 pcie_ep->reset = devm_gpiod_get(dev, "reset", GPIOD_IN);
470 if (IS_ERR(pcie_ep->reset))
471 return PTR_ERR(pcie_ep->reset);
473 pcie_ep->wake = devm_gpiod_get_optional(dev, "wake", GPIOD_OUT_LOW);
474 if (IS_ERR(pcie_ep->wake))
475 return PTR_ERR(pcie_ep->wake);
477 pcie_ep->phy = devm_phy_optional_get(&pdev->dev, "pciephy");
478 if (IS_ERR(pcie_ep->phy))
479 ret = PTR_ERR(pcie_ep->phy);
484 /* TODO: Notify clients about PCIe state change */
485 static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
487 struct qcom_pcie_ep *pcie_ep = data;
488 struct dw_pcie *pci = &pcie_ep->pci;
489 struct device *dev = pci->dev;
490 u32 status = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_STATUS);
491 u32 mask = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_MASK);
494 writel_relaxed(status, pcie_ep->parf + PARF_INT_ALL_CLEAR);
497 if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) {
498 dev_dbg(dev, "Received Linkdown event\n");
499 pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
500 } else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
501 dev_dbg(dev, "Received BME event. Link is enabled!\n");
502 pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
503 } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
504 dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
505 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
506 val |= PARF_PM_CTRL_READY_ENTR_L23;
507 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
508 } else if (FIELD_GET(PARF_INT_ALL_DSTATE_CHANGE, status)) {
509 dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) &
510 DBI_CON_STATUS_POWER_STATE_MASK;
511 dev_dbg(dev, "Received D%d state event\n", dstate);
513 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
514 val |= PARF_PM_CTRL_REQ_EXIT_L1;
515 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
517 } else if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) {
518 dev_dbg(dev, "Received Linkup event. Enumeration complete!\n");
519 dw_pcie_ep_linkup(&pci->ep);
520 pcie_ep->link_status = QCOM_PCIE_EP_LINK_UP;
522 dev_dbg(dev, "Received unknown event: %d\n", status);
528 static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data)
530 struct qcom_pcie_ep *pcie_ep = data;
531 struct dw_pcie *pci = &pcie_ep->pci;
532 struct device *dev = pci->dev;
535 perst = gpiod_get_value(pcie_ep->reset);
537 dev_dbg(dev, "PERST asserted by host. Shutting down the PCIe link!\n");
538 qcom_pcie_perst_assert(pci);
540 dev_dbg(dev, "PERST de-asserted by host. Starting link training!\n");
541 qcom_pcie_perst_deassert(pci);
544 irq_set_irq_type(gpiod_to_irq(pcie_ep->reset),
545 (perst ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW));
550 static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
551 struct qcom_pcie_ep *pcie_ep)
555 irq = platform_get_irq_byname(pdev, "global");
559 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
560 qcom_pcie_ep_global_irq_thread,
562 "global_irq", pcie_ep);
564 dev_err(&pdev->dev, "Failed to request Global IRQ\n");
568 pcie_ep->perst_irq = gpiod_to_irq(pcie_ep->reset);
569 irq_set_status_flags(pcie_ep->perst_irq, IRQ_NOAUTOEN);
570 ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->perst_irq, NULL,
571 qcom_pcie_ep_perst_irq_thread,
572 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
573 "perst_irq", pcie_ep);
575 dev_err(&pdev->dev, "Failed to request PERST IRQ\n");
583 static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
584 enum pci_epc_irq_type type, u16 interrupt_num)
586 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
589 case PCI_EPC_IRQ_LEGACY:
590 return dw_pcie_ep_raise_legacy_irq(ep, func_no);
591 case PCI_EPC_IRQ_MSI:
592 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
594 dev_err(pci->dev, "Unknown IRQ type\n");
599 static const struct pci_epc_features qcom_pcie_epc_features = {
600 .linkup_notifier = true,
601 .core_init_notifier = true,
603 .msix_capable = false,
606 static const struct pci_epc_features *
607 qcom_pcie_epc_get_features(struct dw_pcie_ep *pci_ep)
609 return &qcom_pcie_epc_features;
612 static void qcom_pcie_ep_init(struct dw_pcie_ep *ep)
614 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
617 for (bar = BAR_0; bar <= BAR_5; bar++)
618 dw_pcie_ep_reset_bar(pci, bar);
621 static const struct dw_pcie_ep_ops pci_ep_ops = {
622 .ep_init = qcom_pcie_ep_init,
623 .raise_irq = qcom_pcie_ep_raise_irq,
624 .get_features = qcom_pcie_epc_get_features,
627 static int qcom_pcie_ep_probe(struct platform_device *pdev)
629 struct device *dev = &pdev->dev;
630 struct qcom_pcie_ep *pcie_ep;
633 pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL);
637 pcie_ep->pci.dev = dev;
638 pcie_ep->pci.ops = &pci_ops;
639 pcie_ep->pci.ep.ops = &pci_ep_ops;
640 platform_set_drvdata(pdev, pcie_ep);
642 ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);
646 ret = clk_bulk_prepare_enable(ARRAY_SIZE(qcom_pcie_ep_clks),
651 ret = qcom_pcie_ep_core_reset(pcie_ep);
653 goto err_disable_clk;
655 ret = phy_init(pcie_ep->phy);
657 goto err_disable_clk;
659 /* PHY needs to be powered on for dw_pcie_ep_init() */
660 ret = phy_power_on(pcie_ep->phy);
664 ret = dw_pcie_ep_init(&pcie_ep->pci.ep);
666 dev_err(dev, "Failed to initialize endpoint: %d\n", ret);
667 goto err_phy_power_off;
670 ret = qcom_pcie_ep_enable_irq_resources(pdev, pcie_ep);
672 goto err_phy_power_off;
677 phy_power_off(pcie_ep->phy);
679 phy_exit(pcie_ep->phy);
681 clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks),
687 static int qcom_pcie_ep_remove(struct platform_device *pdev)
689 struct qcom_pcie_ep *pcie_ep = platform_get_drvdata(pdev);
691 if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED)
694 phy_power_off(pcie_ep->phy);
695 phy_exit(pcie_ep->phy);
696 clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks),
702 static const struct of_device_id qcom_pcie_ep_match[] = {
703 { .compatible = "qcom,sdx55-pcie-ep", },
707 static struct platform_driver qcom_pcie_ep_driver = {
708 .probe = qcom_pcie_ep_probe,
709 .remove = qcom_pcie_ep_remove,
711 .name = "qcom-pcie-ep",
712 .of_match_table = qcom_pcie_ep_match,
715 builtin_platform_driver(qcom_pcie_ep_driver);
719 MODULE_DESCRIPTION("Qualcomm PCIe Endpoint controller driver");
720 MODULE_LICENSE("GPL v2");