1 // SPDX-License-Identifier: GPL-2.0
3 * Qualcomm PCIe Endpoint controller driver
5 * Copyright (c) 2020, The Linux Foundation. All rights reserved.
6 * Author: Siddartha Mohanadoss <smohanad@codeaurora.org
8 * Copyright (c) 2021, Linaro Ltd.
9 * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org
12 #include <linux/clk.h>
13 #include <linux/debugfs.h>
14 #include <linux/delay.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/phy/pcie.h>
18 #include <linux/phy/phy.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_domain.h>
21 #include <linux/regmap.h>
22 #include <linux/reset.h>
23 #include <linux/module.h>
25 #include "pcie-designware.h"
28 #define PARF_SYS_CTRL 0x00
29 #define PARF_DB_CTRL 0x10
30 #define PARF_PM_CTRL 0x20
31 #define PARF_MHI_CLOCK_RESET_CTRL 0x174
32 #define PARF_MHI_BASE_ADDR_LOWER 0x178
33 #define PARF_MHI_BASE_ADDR_UPPER 0x17c
34 #define PARF_DEBUG_INT_EN 0x190
35 #define PARF_AXI_MSTR_RD_HALT_NO_WRITES 0x1a4
36 #define PARF_AXI_MSTR_WR_ADDR_HALT 0x1a8
37 #define PARF_Q2A_FLUSH 0x1ac
38 #define PARF_LTSSM 0x1b0
39 #define PARF_CFG_BITS 0x210
40 #define PARF_INT_ALL_STATUS 0x224
41 #define PARF_INT_ALL_CLEAR 0x228
42 #define PARF_INT_ALL_MASK 0x22c
43 #define PARF_SLV_ADDR_MSB_CTRL 0x2c0
44 #define PARF_DBI_BASE_ADDR 0x350
45 #define PARF_DBI_BASE_ADDR_HI 0x354
46 #define PARF_SLV_ADDR_SPACE_SIZE 0x358
47 #define PARF_SLV_ADDR_SPACE_SIZE_HI 0x35c
48 #define PARF_ATU_BASE_ADDR 0x634
49 #define PARF_ATU_BASE_ADDR_HI 0x638
50 #define PARF_SRIS_MODE 0x644
51 #define PARF_DEBUG_CNT_PM_LINKST_IN_L2 0xc04
52 #define PARF_DEBUG_CNT_PM_LINKST_IN_L1 0xc0c
53 #define PARF_DEBUG_CNT_PM_LINKST_IN_L0S 0xc10
54 #define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1 0xc84
55 #define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2 0xc88
56 #define PARF_DEVICE_TYPE 0x1000
57 #define PARF_BDF_TO_SID_CFG 0x2c00
59 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
60 #define PARF_INT_ALL_LINK_DOWN BIT(1)
61 #define PARF_INT_ALL_BME BIT(2)
62 #define PARF_INT_ALL_PM_TURNOFF BIT(3)
63 #define PARF_INT_ALL_DEBUG BIT(4)
64 #define PARF_INT_ALL_LTR BIT(5)
65 #define PARF_INT_ALL_MHI_Q6 BIT(6)
66 #define PARF_INT_ALL_MHI_A7 BIT(7)
67 #define PARF_INT_ALL_DSTATE_CHANGE BIT(8)
68 #define PARF_INT_ALL_L1SUB_TIMEOUT BIT(9)
69 #define PARF_INT_ALL_MMIO_WRITE BIT(10)
70 #define PARF_INT_ALL_CFG_WRITE BIT(11)
71 #define PARF_INT_ALL_BRIDGE_FLUSH_N BIT(12)
72 #define PARF_INT_ALL_LINK_UP BIT(13)
73 #define PARF_INT_ALL_AER_LEGACY BIT(14)
74 #define PARF_INT_ALL_PLS_ERR BIT(15)
75 #define PARF_INT_ALL_PME_LEGACY BIT(16)
76 #define PARF_INT_ALL_PLS_PME BIT(17)
78 /* PARF_BDF_TO_SID_CFG register fields */
79 #define PARF_BDF_TO_SID_BYPASS BIT(0)
81 /* PARF_DEBUG_INT_EN register fields */
82 #define PARF_DEBUG_INT_PM_DSTATE_CHANGE BIT(1)
83 #define PARF_DEBUG_INT_CFG_BUS_MASTER_EN BIT(2)
84 #define PARF_DEBUG_INT_RADM_PM_TURNOFF BIT(3)
86 /* PARF_DEVICE_TYPE register fields */
87 #define PARF_DEVICE_TYPE_EP 0x0
89 /* PARF_PM_CTRL register fields */
90 #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1)
91 #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2)
92 #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5)
94 /* PARF_MHI_CLOCK_RESET_CTRL fields */
95 #define PARF_MSTR_AXI_CLK_EN BIT(1)
97 /* PARF_AXI_MSTR_RD_HALT_NO_WRITES register fields */
98 #define PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN BIT(0)
100 /* PARF_AXI_MSTR_WR_ADDR_HALT register fields */
101 #define PARF_AXI_MSTR_WR_ADDR_HALT_EN BIT(31)
103 /* PARF_Q2A_FLUSH register fields */
104 #define PARF_Q2A_FLUSH_EN BIT(16)
106 /* PARF_SYS_CTRL register fields */
107 #define PARF_SYS_CTRL_AUX_PWR_DET BIT(4)
108 #define PARF_SYS_CTRL_CORE_CLK_CGC_DIS BIT(6)
109 #define PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS BIT(10)
110 #define PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE BIT(11)
112 /* PARF_DB_CTRL register fields */
113 #define PARF_DB_CTRL_INSR_DBNCR_BLOCK BIT(0)
114 #define PARF_DB_CTRL_RMVL_DBNCR_BLOCK BIT(1)
115 #define PARF_DB_CTRL_DBI_WKP_BLOCK BIT(4)
116 #define PARF_DB_CTRL_SLV_WKP_BLOCK BIT(5)
117 #define PARF_DB_CTRL_MST_WKP_BLOCK BIT(6)
119 /* PARF_CFG_BITS register fields */
120 #define PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN BIT(1)
123 #define ELBI_SYS_STTS 0x08
126 #define DBI_CON_STATUS 0x44
128 /* DBI register fields */
129 #define DBI_CON_STATUS_POWER_STATE_MASK GENMASK(1, 0)
131 #define XMLH_LINK_UP 0x400
132 #define CORE_RESET_TIME_US_MIN 1000
133 #define CORE_RESET_TIME_US_MAX 1005
134 #define WAKE_DELAY_US 2000 /* 2 ms */
136 #define to_pcie_ep(x) dev_get_drvdata((x)->dev)
138 enum qcom_pcie_ep_link_status {
139 QCOM_PCIE_EP_LINK_DISABLED,
140 QCOM_PCIE_EP_LINK_ENABLED,
141 QCOM_PCIE_EP_LINK_UP,
142 QCOM_PCIE_EP_LINK_DOWN,
146 * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller
147 * @pci: Designware PCIe controller struct
148 * @parf: Qualcomm PCIe specific PARF register base
149 * @elbi: Designware PCIe specific ELBI register base
150 * @mmio: MMIO register base
151 * @perst_map: PERST regmap
152 * @mmio_res: MMIO region resource
153 * @core_reset: PCIe Endpoint core reset
154 * @reset: PERST# GPIO
156 * @phy: PHY controller block
157 * @debugfs: PCIe Endpoint Debugfs directory
159 * @num_clks: PCIe clocks count
160 * @perst_en: Flag for PERST enable
161 * @perst_sep_en: Flag for PERST separation enable
162 * @link_status: PCIe Link status
163 * @global_irq: Qualcomm PCIe specific Global IRQ
164 * @perst_irq: PERST# IRQ
166 struct qcom_pcie_ep {
172 struct regmap *perst_map;
173 struct resource *mmio_res;
175 struct reset_control *core_reset;
176 struct gpio_desc *reset;
177 struct gpio_desc *wake;
179 struct dentry *debugfs;
181 struct clk_bulk_data *clks;
187 enum qcom_pcie_ep_link_status link_status;
192 static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep)
194 struct dw_pcie *pci = &pcie_ep->pci;
195 struct device *dev = pci->dev;
198 ret = reset_control_assert(pcie_ep->core_reset);
200 dev_err(dev, "Cannot assert core reset\n");
204 usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX);
206 ret = reset_control_deassert(pcie_ep->core_reset);
208 dev_err(dev, "Cannot de-assert core reset\n");
212 usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX);
218 * Delatch PERST_EN and PERST_SEPARATION_ENABLE with TCSR to avoid
219 * device reset during host reboot and hibernation. The driver is
220 * expected to handle this situation.
222 static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep)
224 if (pcie_ep->perst_map) {
225 regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0);
226 regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0);
230 static int qcom_pcie_dw_link_up(struct dw_pcie *pci)
232 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
235 reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS);
237 return reg & XMLH_LINK_UP;
240 static int qcom_pcie_dw_start_link(struct dw_pcie *pci)
242 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
244 enable_irq(pcie_ep->perst_irq);
249 static void qcom_pcie_dw_stop_link(struct dw_pcie *pci)
251 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
253 disable_irq(pcie_ep->perst_irq);
256 static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
260 ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks);
264 ret = qcom_pcie_ep_core_reset(pcie_ep);
266 goto err_disable_clk;
268 ret = phy_init(pcie_ep->phy);
270 goto err_disable_clk;
272 ret = phy_set_mode_ext(pcie_ep->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_EP);
276 ret = phy_power_on(pcie_ep->phy);
283 phy_exit(pcie_ep->phy);
285 clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
290 static void qcom_pcie_disable_resources(struct qcom_pcie_ep *pcie_ep)
292 phy_power_off(pcie_ep->phy);
293 phy_exit(pcie_ep->phy);
294 clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
297 static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
299 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
300 struct device *dev = pci->dev;
304 ret = qcom_pcie_enable_resources(pcie_ep);
306 dev_err(dev, "Failed to enable resources: %d\n", ret);
310 /* Assert WAKE# to RC to indicate device is ready */
311 gpiod_set_value_cansleep(pcie_ep->wake, 1);
312 usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500);
313 gpiod_set_value_cansleep(pcie_ep->wake, 0);
315 qcom_pcie_ep_configure_tcsr(pcie_ep);
317 /* Disable BDF to SID mapping */
318 val = readl_relaxed(pcie_ep->parf + PARF_BDF_TO_SID_CFG);
319 val |= PARF_BDF_TO_SID_BYPASS;
320 writel_relaxed(val, pcie_ep->parf + PARF_BDF_TO_SID_CFG);
322 /* Enable debug IRQ */
323 val = readl_relaxed(pcie_ep->parf + PARF_DEBUG_INT_EN);
324 val |= PARF_DEBUG_INT_RADM_PM_TURNOFF |
325 PARF_DEBUG_INT_CFG_BUS_MASTER_EN |
326 PARF_DEBUG_INT_PM_DSTATE_CHANGE;
327 writel_relaxed(val, pcie_ep->parf + PARF_DEBUG_INT_EN);
329 /* Configure PCIe to endpoint mode */
330 writel_relaxed(PARF_DEVICE_TYPE_EP, pcie_ep->parf + PARF_DEVICE_TYPE);
332 /* Allow entering L1 state */
333 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
334 val &= ~PARF_PM_CTRL_REQ_NOT_ENTR_L1;
335 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
337 /* Read halts write */
338 val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES);
339 val &= ~PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN;
340 writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES);
342 /* Write after write halt */
343 val = readl_relaxed(pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
344 val |= PARF_AXI_MSTR_WR_ADDR_HALT_EN;
345 writel_relaxed(val, pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
347 /* Q2A flush disable */
348 val = readl_relaxed(pcie_ep->parf + PARF_Q2A_FLUSH);
349 val &= ~PARF_Q2A_FLUSH_EN;
350 writel_relaxed(val, pcie_ep->parf + PARF_Q2A_FLUSH);
353 * Disable Master AXI clock during idle. Do not allow DBI access
354 * to take the core out of L1. Disable core clock gating that
355 * gates PIPE clock from propagating to core clock. Report to the
356 * host that Vaux is present.
358 val = readl_relaxed(pcie_ep->parf + PARF_SYS_CTRL);
359 val &= ~PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS;
360 val |= PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE |
361 PARF_SYS_CTRL_CORE_CLK_CGC_DIS |
362 PARF_SYS_CTRL_AUX_PWR_DET;
363 writel_relaxed(val, pcie_ep->parf + PARF_SYS_CTRL);
365 /* Disable the debouncers */
366 val = readl_relaxed(pcie_ep->parf + PARF_DB_CTRL);
367 val |= PARF_DB_CTRL_INSR_DBNCR_BLOCK | PARF_DB_CTRL_RMVL_DBNCR_BLOCK |
368 PARF_DB_CTRL_DBI_WKP_BLOCK | PARF_DB_CTRL_SLV_WKP_BLOCK |
369 PARF_DB_CTRL_MST_WKP_BLOCK;
370 writel_relaxed(val, pcie_ep->parf + PARF_DB_CTRL);
372 /* Request to exit from L1SS for MSI and LTR MSG */
373 val = readl_relaxed(pcie_ep->parf + PARF_CFG_BITS);
374 val |= PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN;
375 writel_relaxed(val, pcie_ep->parf + PARF_CFG_BITS);
377 dw_pcie_dbi_ro_wr_en(pci);
379 /* Set the L0s Exit Latency to 2us-4us = 0x6 */
380 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
381 val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
382 val &= ~PCI_EXP_LNKCAP_L0SEL;
383 val |= FIELD_PREP(PCI_EXP_LNKCAP_L0SEL, 0x6);
384 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val);
386 /* Set the L1 Exit Latency to be 32us-64 us = 0x6 */
387 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
388 val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
389 val &= ~PCI_EXP_LNKCAP_L1EL;
390 val |= FIELD_PREP(PCI_EXP_LNKCAP_L1EL, 0x6);
391 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, val);
393 dw_pcie_dbi_ro_wr_dis(pci);
395 writel_relaxed(0, pcie_ep->parf + PARF_INT_ALL_MASK);
396 val = PARF_INT_ALL_LINK_DOWN | PARF_INT_ALL_BME |
397 PARF_INT_ALL_PM_TURNOFF | PARF_INT_ALL_DSTATE_CHANGE |
398 PARF_INT_ALL_LINK_UP;
399 writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK);
401 ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep);
403 dev_err(dev, "Failed to complete initialization: %d\n", ret);
404 goto err_disable_resources;
408 * The physical address of the MMIO region which is exposed as the BAR
409 * should be written to MHI BASE registers.
411 writel_relaxed(pcie_ep->mmio_res->start,
412 pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER);
413 writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER);
415 /* Gate Master AXI clock to MHI bus during L1SS */
416 val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL);
417 val &= ~PARF_MSTR_AXI_CLK_EN;
418 val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL);
420 dw_pcie_ep_init_notify(&pcie_ep->pci.ep);
423 val = readl_relaxed(pcie_ep->parf + PARF_LTSSM);
425 writel_relaxed(val, pcie_ep->parf + PARF_LTSSM);
429 err_disable_resources:
430 qcom_pcie_disable_resources(pcie_ep);
435 static void qcom_pcie_perst_assert(struct dw_pcie *pci)
437 struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
438 struct device *dev = pci->dev;
440 if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) {
441 dev_dbg(dev, "Link is already disabled\n");
445 qcom_pcie_disable_resources(pcie_ep);
446 pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;
449 /* Common DWC controller ops */
450 static const struct dw_pcie_ops pci_ops = {
451 .link_up = qcom_pcie_dw_link_up,
452 .start_link = qcom_pcie_dw_start_link,
453 .stop_link = qcom_pcie_dw_stop_link,
456 static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev,
457 struct qcom_pcie_ep *pcie_ep)
459 struct device *dev = &pdev->dev;
460 struct dw_pcie *pci = &pcie_ep->pci;
461 struct device_node *syscon;
462 struct resource *res;
465 pcie_ep->parf = devm_platform_ioremap_resource_byname(pdev, "parf");
466 if (IS_ERR(pcie_ep->parf))
467 return PTR_ERR(pcie_ep->parf);
469 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
470 pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
471 if (IS_ERR(pci->dbi_base))
472 return PTR_ERR(pci->dbi_base);
473 pci->dbi_base2 = pci->dbi_base;
475 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
476 pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res);
477 if (IS_ERR(pcie_ep->elbi))
478 return PTR_ERR(pcie_ep->elbi);
480 pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
482 if (!pcie_ep->mmio_res) {
483 dev_err(dev, "Failed to get mmio resource\n");
487 pcie_ep->mmio = devm_pci_remap_cfg_resource(dev, pcie_ep->mmio_res);
488 if (IS_ERR(pcie_ep->mmio))
489 return PTR_ERR(pcie_ep->mmio);
491 syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0);
493 dev_dbg(dev, "PERST separation not available\n");
497 pcie_ep->perst_map = syscon_node_to_regmap(syscon);
499 if (IS_ERR(pcie_ep->perst_map))
500 return PTR_ERR(pcie_ep->perst_map);
502 ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs",
503 1, &pcie_ep->perst_en);
505 dev_err(dev, "No Perst Enable offset in syscon\n");
509 ret = of_property_read_u32_index(dev->of_node, "qcom,perst-regs",
510 2, &pcie_ep->perst_sep_en);
512 dev_err(dev, "No Perst Separation Enable offset in syscon\n");
519 static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
520 struct qcom_pcie_ep *pcie_ep)
522 struct device *dev = &pdev->dev;
525 ret = qcom_pcie_ep_get_io_resources(pdev, pcie_ep);
527 dev_err(dev, "Failed to get io resources %d\n", ret);
531 pcie_ep->num_clks = devm_clk_bulk_get_all(dev, &pcie_ep->clks);
532 if (pcie_ep->num_clks < 0) {
533 dev_err(dev, "Failed to get clocks\n");
534 return pcie_ep->num_clks;
537 pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core");
538 if (IS_ERR(pcie_ep->core_reset))
539 return PTR_ERR(pcie_ep->core_reset);
541 pcie_ep->reset = devm_gpiod_get(dev, "reset", GPIOD_IN);
542 if (IS_ERR(pcie_ep->reset))
543 return PTR_ERR(pcie_ep->reset);
545 pcie_ep->wake = devm_gpiod_get_optional(dev, "wake", GPIOD_OUT_LOW);
546 if (IS_ERR(pcie_ep->wake))
547 return PTR_ERR(pcie_ep->wake);
549 pcie_ep->phy = devm_phy_optional_get(dev, "pciephy");
550 if (IS_ERR(pcie_ep->phy))
551 ret = PTR_ERR(pcie_ep->phy);
556 /* TODO: Notify clients about PCIe state change */
557 static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
559 struct qcom_pcie_ep *pcie_ep = data;
560 struct dw_pcie *pci = &pcie_ep->pci;
561 struct device *dev = pci->dev;
562 u32 status = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_STATUS);
563 u32 mask = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_MASK);
566 writel_relaxed(status, pcie_ep->parf + PARF_INT_ALL_CLEAR);
569 if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) {
570 dev_dbg(dev, "Received Linkdown event\n");
571 pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
572 pci_epc_linkdown(pci->ep.epc);
573 } else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
574 dev_dbg(dev, "Received BME event. Link is enabled!\n");
575 pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
576 pci_epc_bme_notify(pci->ep.epc);
577 } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
578 dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
579 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
580 val |= PARF_PM_CTRL_READY_ENTR_L23;
581 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
582 } else if (FIELD_GET(PARF_INT_ALL_DSTATE_CHANGE, status)) {
583 dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) &
584 DBI_CON_STATUS_POWER_STATE_MASK;
585 dev_dbg(dev, "Received D%d state event\n", dstate);
587 val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
588 val |= PARF_PM_CTRL_REQ_EXIT_L1;
589 writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
591 } else if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) {
592 dev_dbg(dev, "Received Linkup event. Enumeration complete!\n");
593 dw_pcie_ep_linkup(&pci->ep);
594 pcie_ep->link_status = QCOM_PCIE_EP_LINK_UP;
596 dev_dbg(dev, "Received unknown event: %d\n", status);
602 static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data)
604 struct qcom_pcie_ep *pcie_ep = data;
605 struct dw_pcie *pci = &pcie_ep->pci;
606 struct device *dev = pci->dev;
609 perst = gpiod_get_value(pcie_ep->reset);
611 dev_dbg(dev, "PERST asserted by host. Shutting down the PCIe link!\n");
612 qcom_pcie_perst_assert(pci);
614 dev_dbg(dev, "PERST de-asserted by host. Starting link training!\n");
615 qcom_pcie_perst_deassert(pci);
618 irq_set_irq_type(gpiod_to_irq(pcie_ep->reset),
619 (perst ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW));
624 static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
625 struct qcom_pcie_ep *pcie_ep)
629 pcie_ep->global_irq = platform_get_irq_byname(pdev, "global");
630 if (pcie_ep->global_irq < 0)
631 return pcie_ep->global_irq;
633 ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->global_irq, NULL,
634 qcom_pcie_ep_global_irq_thread,
636 "global_irq", pcie_ep);
638 dev_err(&pdev->dev, "Failed to request Global IRQ\n");
642 pcie_ep->perst_irq = gpiod_to_irq(pcie_ep->reset);
643 irq_set_status_flags(pcie_ep->perst_irq, IRQ_NOAUTOEN);
644 ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->perst_irq, NULL,
645 qcom_pcie_ep_perst_irq_thread,
646 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
647 "perst_irq", pcie_ep);
649 dev_err(&pdev->dev, "Failed to request PERST IRQ\n");
650 disable_irq(pcie_ep->global_irq);
657 static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
658 enum pci_epc_irq_type type, u16 interrupt_num)
660 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
663 case PCI_EPC_IRQ_LEGACY:
664 return dw_pcie_ep_raise_legacy_irq(ep, func_no);
665 case PCI_EPC_IRQ_MSI:
666 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
668 dev_err(pci->dev, "Unknown IRQ type\n");
673 static int qcom_pcie_ep_link_transition_count(struct seq_file *s, void *data)
675 struct qcom_pcie_ep *pcie_ep = (struct qcom_pcie_ep *)
676 dev_get_drvdata(s->private);
678 seq_printf(s, "L0s transition count: %u\n",
679 readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
681 seq_printf(s, "L1 transition count: %u\n",
682 readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
684 seq_printf(s, "L1.1 transition count: %u\n",
685 readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
687 seq_printf(s, "L1.2 transition count: %u\n",
688 readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
690 seq_printf(s, "L2 transition count: %u\n",
691 readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
696 static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep)
698 struct dw_pcie *pci = &pcie_ep->pci;
700 debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie_ep->debugfs,
701 qcom_pcie_ep_link_transition_count);
704 static const struct pci_epc_features qcom_pcie_epc_features = {
705 .linkup_notifier = true,
706 .core_init_notifier = true,
708 .msix_capable = false,
712 static const struct pci_epc_features *
713 qcom_pcie_epc_get_features(struct dw_pcie_ep *pci_ep)
715 return &qcom_pcie_epc_features;
718 static void qcom_pcie_ep_init(struct dw_pcie_ep *ep)
720 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
723 for (bar = BAR_0; bar <= BAR_5; bar++)
724 dw_pcie_ep_reset_bar(pci, bar);
727 static const struct dw_pcie_ep_ops pci_ep_ops = {
728 .ep_init = qcom_pcie_ep_init,
729 .raise_irq = qcom_pcie_ep_raise_irq,
730 .get_features = qcom_pcie_epc_get_features,
733 static int qcom_pcie_ep_probe(struct platform_device *pdev)
735 struct device *dev = &pdev->dev;
736 struct qcom_pcie_ep *pcie_ep;
740 pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL);
744 pcie_ep->pci.dev = dev;
745 pcie_ep->pci.ops = &pci_ops;
746 pcie_ep->pci.ep.ops = &pci_ep_ops;
747 platform_set_drvdata(pdev, pcie_ep);
749 ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);
753 ret = qcom_pcie_enable_resources(pcie_ep);
755 dev_err(dev, "Failed to enable resources: %d\n", ret);
759 ret = dw_pcie_ep_init(&pcie_ep->pci.ep);
761 dev_err(dev, "Failed to initialize endpoint: %d\n", ret);
762 goto err_disable_resources;
765 ret = qcom_pcie_ep_enable_irq_resources(pdev, pcie_ep);
767 goto err_disable_resources;
769 name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
772 goto err_disable_irqs;
775 pcie_ep->debugfs = debugfs_create_dir(name, NULL);
776 qcom_pcie_ep_init_debugfs(pcie_ep);
781 disable_irq(pcie_ep->global_irq);
782 disable_irq(pcie_ep->perst_irq);
784 err_disable_resources:
785 qcom_pcie_disable_resources(pcie_ep);
790 static void qcom_pcie_ep_remove(struct platform_device *pdev)
792 struct qcom_pcie_ep *pcie_ep = platform_get_drvdata(pdev);
794 disable_irq(pcie_ep->global_irq);
795 disable_irq(pcie_ep->perst_irq);
797 debugfs_remove_recursive(pcie_ep->debugfs);
799 if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED)
802 qcom_pcie_disable_resources(pcie_ep);
805 static const struct of_device_id qcom_pcie_ep_match[] = {
806 { .compatible = "qcom,sdx55-pcie-ep", },
807 { .compatible = "qcom,sm8450-pcie-ep", },
810 MODULE_DEVICE_TABLE(of, qcom_pcie_ep_match);
812 static struct platform_driver qcom_pcie_ep_driver = {
813 .probe = qcom_pcie_ep_probe,
814 .remove_new = qcom_pcie_ep_remove,
816 .name = "qcom-pcie-ep",
817 .of_match_table = qcom_pcie_ep_match,
820 builtin_platform_driver(qcom_pcie_ep_driver);
822 MODULE_AUTHOR("Siddartha Mohanadoss <smohanad@codeaurora.org>");
823 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
824 MODULE_DESCRIPTION("Qualcomm PCIe Endpoint controller driver");
825 MODULE_LICENSE("GPL v2");