2 * Qualcomm PCIe root complex driver
4 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
5 * Copyright 2015 Linaro Limited.
7 * Author: Stanimir Varbanov <svarbanov@mm-sol.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 and
11 * only version 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/clk.h>
20 #include <linux/delay.h>
21 #include <linux/gpio.h>
22 #include <linux/interrupt.h>
24 #include <linux/iopoll.h>
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/pci.h>
30 #include <linux/platform_device.h>
31 #include <linux/phy/phy.h>
32 #include <linux/regulator/consumer.h>
33 #include <linux/reset.h>
34 #include <linux/slab.h>
35 #include <linux/types.h>
37 #include "pcie-designware.h"
39 #define PCIE20_PARF_SYS_CTRL 0x00
40 #define MST_WAKEUP_EN BIT(13)
41 #define SLV_WAKEUP_EN BIT(12)
42 #define MSTR_ACLK_CGC_DIS BIT(10)
43 #define SLV_ACLK_CGC_DIS BIT(9)
44 #define CORE_CLK_CGC_DIS BIT(6)
45 #define AUX_PWR_DET BIT(4)
46 #define L23_CLK_RMV_DIS BIT(2)
47 #define L1_CLK_RMV_DIS BIT(1)
49 #define PCIE20_COMMAND_STATUS 0x04
50 #define CMD_BME_VAL 0x4
51 #define PCIE20_DEVICE_CONTROL2_STATUS2 0x98
52 #define PCIE_CAP_CPL_TIMEOUT_DISABLE 0x10
54 #define PCIE20_PARF_PHY_CTRL 0x40
55 #define PCIE20_PARF_PHY_REFCLK 0x4C
56 #define PCIE20_PARF_DBI_BASE_ADDR 0x168
57 #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C
58 #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174
59 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178
60 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8
61 #define PCIE20_PARF_LTSSM 0x1B0
62 #define PCIE20_PARF_SID_OFFSET 0x234
63 #define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C
65 #define PCIE20_ELBI_SYS_CTRL 0x04
66 #define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0)
68 #define PCIE20_AXI_MSTR_RESP_COMP_CTRL0 0x818
69 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K 0x4
70 #define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K 0x5
71 #define PCIE20_AXI_MSTR_RESP_COMP_CTRL1 0x81c
72 #define CFG_BRIDGE_SB_INIT BIT(0)
74 #define PCIE20_CAP 0x70
75 #define PCIE20_CAP_LINK_CAPABILITIES (PCIE20_CAP + 0xC)
76 #define PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT (BIT(10) | BIT(11))
77 #define PCIE20_CAP_LINK_1 (PCIE20_CAP + 0x14)
78 #define PCIE_CAP_LINK1_VAL 0x2FD7F
80 #define PCIE20_PARF_Q2A_FLUSH 0x1AC
82 #define PCIE20_MISC_CONTROL_1_REG 0x8BC
83 #define DBI_RO_WR_EN 1
85 #define PERST_DELAY_US 1000
87 #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
88 #define SLV_ADDR_SPACE_SZ 0x10000000
90 struct qcom_pcie_resources_2_1_0 {
91 struct clk *iface_clk;
94 struct reset_control *pci_reset;
95 struct reset_control *axi_reset;
96 struct reset_control *ahb_reset;
97 struct reset_control *por_reset;
98 struct reset_control *phy_reset;
99 struct reset_control *ext_reset;
100 struct regulator *vdda;
101 struct regulator *vdda_phy;
102 struct regulator *vdda_refclk;
105 struct qcom_pcie_resources_1_0_0 {
108 struct clk *master_bus;
109 struct clk *slave_bus;
110 struct reset_control *core;
111 struct regulator *vdda;
114 struct qcom_pcie_resources_2_3_2 {
116 struct clk *master_clk;
117 struct clk *slave_clk;
119 struct clk *pipe_clk;
122 struct qcom_pcie_resources_2_4_0 {
124 struct clk *master_clk;
125 struct clk *slave_clk;
126 struct reset_control *axi_m_reset;
127 struct reset_control *axi_s_reset;
128 struct reset_control *pipe_reset;
129 struct reset_control *axi_m_vmid_reset;
130 struct reset_control *axi_s_xpu_reset;
131 struct reset_control *parf_reset;
132 struct reset_control *phy_reset;
133 struct reset_control *axi_m_sticky_reset;
134 struct reset_control *pipe_sticky_reset;
135 struct reset_control *pwr_reset;
136 struct reset_control *ahb_reset;
137 struct reset_control *phy_ahb_reset;
140 struct qcom_pcie_resources_2_3_3 {
142 struct clk *axi_m_clk;
143 struct clk *axi_s_clk;
146 struct reset_control *rst[7];
149 union qcom_pcie_resources {
150 struct qcom_pcie_resources_1_0_0 v1_0_0;
151 struct qcom_pcie_resources_2_1_0 v2_1_0;
152 struct qcom_pcie_resources_2_3_2 v2_3_2;
153 struct qcom_pcie_resources_2_3_3 v2_3_3;
154 struct qcom_pcie_resources_2_4_0 v2_4_0;
159 struct qcom_pcie_ops {
160 int (*get_resources)(struct qcom_pcie *pcie);
161 int (*init)(struct qcom_pcie *pcie);
162 int (*post_init)(struct qcom_pcie *pcie);
163 void (*deinit)(struct qcom_pcie *pcie);
164 void (*post_deinit)(struct qcom_pcie *pcie);
165 void (*ltssm_enable)(struct qcom_pcie *pcie);
170 void __iomem *parf; /* DT parf */
171 void __iomem *elbi; /* DT elbi */
172 union qcom_pcie_resources res;
174 struct gpio_desc *reset;
175 struct qcom_pcie_ops *ops;
178 #define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
180 static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
182 gpiod_set_value_cansleep(pcie->reset, 1);
183 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
186 static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
188 gpiod_set_value_cansleep(pcie->reset, 0);
189 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
192 static irqreturn_t qcom_pcie_msi_irq_handler(int irq, void *arg)
194 struct pcie_port *pp = arg;
196 return dw_handle_msi_irq(pp);
199 static int qcom_pcie_establish_link(struct qcom_pcie *pcie)
201 struct dw_pcie *pci = pcie->pci;
203 if (dw_pcie_link_up(pci))
206 /* Enable Link Training state machine */
207 if (pcie->ops->ltssm_enable)
208 pcie->ops->ltssm_enable(pcie);
210 return dw_pcie_wait_for_link(pci);
213 static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
217 /* enable link training */
218 val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL);
219 val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE;
220 writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL);
223 static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
225 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
226 struct dw_pcie *pci = pcie->pci;
227 struct device *dev = pci->dev;
229 res->vdda = devm_regulator_get(dev, "vdda");
230 if (IS_ERR(res->vdda))
231 return PTR_ERR(res->vdda);
233 res->vdda_phy = devm_regulator_get(dev, "vdda_phy");
234 if (IS_ERR(res->vdda_phy))
235 return PTR_ERR(res->vdda_phy);
237 res->vdda_refclk = devm_regulator_get(dev, "vdda_refclk");
238 if (IS_ERR(res->vdda_refclk))
239 return PTR_ERR(res->vdda_refclk);
241 res->iface_clk = devm_clk_get(dev, "iface");
242 if (IS_ERR(res->iface_clk))
243 return PTR_ERR(res->iface_clk);
245 res->core_clk = devm_clk_get(dev, "core");
246 if (IS_ERR(res->core_clk))
247 return PTR_ERR(res->core_clk);
249 res->phy_clk = devm_clk_get(dev, "phy");
250 if (IS_ERR(res->phy_clk))
251 return PTR_ERR(res->phy_clk);
253 res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
254 if (IS_ERR(res->pci_reset))
255 return PTR_ERR(res->pci_reset);
257 res->axi_reset = devm_reset_control_get_exclusive(dev, "axi");
258 if (IS_ERR(res->axi_reset))
259 return PTR_ERR(res->axi_reset);
261 res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
262 if (IS_ERR(res->ahb_reset))
263 return PTR_ERR(res->ahb_reset);
265 res->por_reset = devm_reset_control_get_exclusive(dev, "por");
266 if (IS_ERR(res->por_reset))
267 return PTR_ERR(res->por_reset);
269 res->ext_reset = devm_reset_control_get_optional_exclusive(dev, "ext");
270 if (IS_ERR(res->ext_reset))
271 return PTR_ERR(res->ext_reset);
273 res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
274 return PTR_ERR_OR_ZERO(res->phy_reset);
277 static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
279 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
281 reset_control_assert(res->pci_reset);
282 reset_control_assert(res->axi_reset);
283 reset_control_assert(res->ahb_reset);
284 reset_control_assert(res->por_reset);
285 reset_control_assert(res->ext_reset);
286 reset_control_assert(res->pci_reset);
287 clk_disable_unprepare(res->iface_clk);
288 clk_disable_unprepare(res->core_clk);
289 clk_disable_unprepare(res->phy_clk);
290 regulator_disable(res->vdda);
291 regulator_disable(res->vdda_phy);
292 regulator_disable(res->vdda_refclk);
295 static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
297 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
298 struct dw_pcie *pci = pcie->pci;
299 struct device *dev = pci->dev;
303 ret = regulator_enable(res->vdda);
305 dev_err(dev, "cannot enable vdda regulator\n");
309 ret = regulator_enable(res->vdda_refclk);
311 dev_err(dev, "cannot enable vdda_refclk regulator\n");
315 ret = regulator_enable(res->vdda_phy);
317 dev_err(dev, "cannot enable vdda_phy regulator\n");
321 ret = reset_control_assert(res->ahb_reset);
323 dev_err(dev, "cannot assert ahb reset\n");
327 ret = clk_prepare_enable(res->iface_clk);
329 dev_err(dev, "cannot prepare/enable iface clock\n");
333 ret = clk_prepare_enable(res->phy_clk);
335 dev_err(dev, "cannot prepare/enable phy clock\n");
339 ret = clk_prepare_enable(res->core_clk);
341 dev_err(dev, "cannot prepare/enable core clock\n");
345 ret = reset_control_deassert(res->ahb_reset);
347 dev_err(dev, "cannot deassert ahb reset\n");
348 goto err_deassert_ahb;
351 ret = reset_control_deassert(res->ext_reset);
353 dev_err(dev, "cannot deassert ext reset\n");
354 goto err_deassert_ahb;
357 /* enable PCIe clocks and resets */
358 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
360 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
362 /* enable external reference clock */
363 val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
365 writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
367 ret = reset_control_deassert(res->phy_reset);
369 dev_err(dev, "cannot deassert phy reset\n");
373 ret = reset_control_deassert(res->pci_reset);
375 dev_err(dev, "cannot deassert pci reset\n");
379 ret = reset_control_deassert(res->por_reset);
381 dev_err(dev, "cannot deassert por reset\n");
385 ret = reset_control_deassert(res->axi_reset);
387 dev_err(dev, "cannot deassert axi reset\n");
391 /* wait for clock acquisition */
392 usleep_range(1000, 1500);
395 /* Set the Max TLP size to 2K, instead of using default of 4K */
396 writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
397 pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
398 writel(CFG_BRIDGE_SB_INIT,
399 pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
404 clk_disable_unprepare(res->core_clk);
406 clk_disable_unprepare(res->phy_clk);
408 clk_disable_unprepare(res->iface_clk);
410 regulator_disable(res->vdda_phy);
412 regulator_disable(res->vdda_refclk);
414 regulator_disable(res->vdda);
419 static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie)
421 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
422 struct dw_pcie *pci = pcie->pci;
423 struct device *dev = pci->dev;
425 res->vdda = devm_regulator_get(dev, "vdda");
426 if (IS_ERR(res->vdda))
427 return PTR_ERR(res->vdda);
429 res->iface = devm_clk_get(dev, "iface");
430 if (IS_ERR(res->iface))
431 return PTR_ERR(res->iface);
433 res->aux = devm_clk_get(dev, "aux");
434 if (IS_ERR(res->aux))
435 return PTR_ERR(res->aux);
437 res->master_bus = devm_clk_get(dev, "master_bus");
438 if (IS_ERR(res->master_bus))
439 return PTR_ERR(res->master_bus);
441 res->slave_bus = devm_clk_get(dev, "slave_bus");
442 if (IS_ERR(res->slave_bus))
443 return PTR_ERR(res->slave_bus);
445 res->core = devm_reset_control_get_exclusive(dev, "core");
446 return PTR_ERR_OR_ZERO(res->core);
449 static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie)
451 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
453 reset_control_assert(res->core);
454 clk_disable_unprepare(res->slave_bus);
455 clk_disable_unprepare(res->master_bus);
456 clk_disable_unprepare(res->iface);
457 clk_disable_unprepare(res->aux);
458 regulator_disable(res->vdda);
461 static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
463 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
464 struct dw_pcie *pci = pcie->pci;
465 struct device *dev = pci->dev;
468 ret = reset_control_deassert(res->core);
470 dev_err(dev, "cannot deassert core reset\n");
474 ret = clk_prepare_enable(res->aux);
476 dev_err(dev, "cannot prepare/enable aux clock\n");
480 ret = clk_prepare_enable(res->iface);
482 dev_err(dev, "cannot prepare/enable iface clock\n");
486 ret = clk_prepare_enable(res->master_bus);
488 dev_err(dev, "cannot prepare/enable master_bus clock\n");
492 ret = clk_prepare_enable(res->slave_bus);
494 dev_err(dev, "cannot prepare/enable slave_bus clock\n");
498 ret = regulator_enable(res->vdda);
500 dev_err(dev, "cannot enable vdda regulator\n");
504 /* change DBI base address */
505 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
507 if (IS_ENABLED(CONFIG_PCI_MSI)) {
508 u32 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
511 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
516 clk_disable_unprepare(res->slave_bus);
518 clk_disable_unprepare(res->master_bus);
520 clk_disable_unprepare(res->iface);
522 clk_disable_unprepare(res->aux);
524 reset_control_assert(res->core);
529 static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
533 /* enable link training */
534 val = readl(pcie->parf + PCIE20_PARF_LTSSM);
536 writel(val, pcie->parf + PCIE20_PARF_LTSSM);
539 static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
541 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
542 struct dw_pcie *pci = pcie->pci;
543 struct device *dev = pci->dev;
545 res->aux_clk = devm_clk_get(dev, "aux");
546 if (IS_ERR(res->aux_clk))
547 return PTR_ERR(res->aux_clk);
549 res->cfg_clk = devm_clk_get(dev, "cfg");
550 if (IS_ERR(res->cfg_clk))
551 return PTR_ERR(res->cfg_clk);
553 res->master_clk = devm_clk_get(dev, "bus_master");
554 if (IS_ERR(res->master_clk))
555 return PTR_ERR(res->master_clk);
557 res->slave_clk = devm_clk_get(dev, "bus_slave");
558 if (IS_ERR(res->slave_clk))
559 return PTR_ERR(res->slave_clk);
561 res->pipe_clk = devm_clk_get(dev, "pipe");
562 return PTR_ERR_OR_ZERO(res->pipe_clk);
565 static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
567 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
569 clk_disable_unprepare(res->slave_clk);
570 clk_disable_unprepare(res->master_clk);
571 clk_disable_unprepare(res->cfg_clk);
572 clk_disable_unprepare(res->aux_clk);
575 static void qcom_pcie_post_deinit_2_3_2(struct qcom_pcie *pcie)
577 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
579 clk_disable_unprepare(res->pipe_clk);
582 static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
584 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
585 struct dw_pcie *pci = pcie->pci;
586 struct device *dev = pci->dev;
590 ret = clk_prepare_enable(res->aux_clk);
592 dev_err(dev, "cannot prepare/enable aux clock\n");
596 ret = clk_prepare_enable(res->cfg_clk);
598 dev_err(dev, "cannot prepare/enable cfg clock\n");
602 ret = clk_prepare_enable(res->master_clk);
604 dev_err(dev, "cannot prepare/enable master clock\n");
608 ret = clk_prepare_enable(res->slave_clk);
610 dev_err(dev, "cannot prepare/enable slave clock\n");
614 /* enable PCIe clocks and resets */
615 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
617 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
619 /* change DBI base address */
620 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
622 /* MAC PHY_POWERDOWN MUX DISABLE */
623 val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
625 writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
627 val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
629 writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
631 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
633 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
638 clk_disable_unprepare(res->master_clk);
640 clk_disable_unprepare(res->cfg_clk);
642 clk_disable_unprepare(res->aux_clk);
647 static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
649 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
650 struct dw_pcie *pci = pcie->pci;
651 struct device *dev = pci->dev;
654 ret = clk_prepare_enable(res->pipe_clk);
656 dev_err(dev, "cannot prepare/enable pipe clock\n");
663 static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
665 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
666 struct dw_pcie *pci = pcie->pci;
667 struct device *dev = pci->dev;
669 res->aux_clk = devm_clk_get(dev, "aux");
670 if (IS_ERR(res->aux_clk))
671 return PTR_ERR(res->aux_clk);
673 res->master_clk = devm_clk_get(dev, "master_bus");
674 if (IS_ERR(res->master_clk))
675 return PTR_ERR(res->master_clk);
677 res->slave_clk = devm_clk_get(dev, "slave_bus");
678 if (IS_ERR(res->slave_clk))
679 return PTR_ERR(res->slave_clk);
681 res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
682 if (IS_ERR(res->axi_m_reset))
683 return PTR_ERR(res->axi_m_reset);
685 res->axi_s_reset = devm_reset_control_get_exclusive(dev, "axi_s");
686 if (IS_ERR(res->axi_s_reset))
687 return PTR_ERR(res->axi_s_reset);
689 res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe");
690 if (IS_ERR(res->pipe_reset))
691 return PTR_ERR(res->pipe_reset);
693 res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev,
695 if (IS_ERR(res->axi_m_vmid_reset))
696 return PTR_ERR(res->axi_m_vmid_reset);
698 res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev,
700 if (IS_ERR(res->axi_s_xpu_reset))
701 return PTR_ERR(res->axi_s_xpu_reset);
703 res->parf_reset = devm_reset_control_get_exclusive(dev, "parf");
704 if (IS_ERR(res->parf_reset))
705 return PTR_ERR(res->parf_reset);
707 res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
708 if (IS_ERR(res->phy_reset))
709 return PTR_ERR(res->phy_reset);
711 res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev,
713 if (IS_ERR(res->axi_m_sticky_reset))
714 return PTR_ERR(res->axi_m_sticky_reset);
716 res->pipe_sticky_reset = devm_reset_control_get_exclusive(dev,
718 if (IS_ERR(res->pipe_sticky_reset))
719 return PTR_ERR(res->pipe_sticky_reset);
721 res->pwr_reset = devm_reset_control_get_exclusive(dev, "pwr");
722 if (IS_ERR(res->pwr_reset))
723 return PTR_ERR(res->pwr_reset);
725 res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
726 if (IS_ERR(res->ahb_reset))
727 return PTR_ERR(res->ahb_reset);
729 res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb");
730 if (IS_ERR(res->phy_ahb_reset))
731 return PTR_ERR(res->phy_ahb_reset);
736 static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
738 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
740 reset_control_assert(res->axi_m_reset);
741 reset_control_assert(res->axi_s_reset);
742 reset_control_assert(res->pipe_reset);
743 reset_control_assert(res->pipe_sticky_reset);
744 reset_control_assert(res->phy_reset);
745 reset_control_assert(res->phy_ahb_reset);
746 reset_control_assert(res->axi_m_sticky_reset);
747 reset_control_assert(res->pwr_reset);
748 reset_control_assert(res->ahb_reset);
749 clk_disable_unprepare(res->aux_clk);
750 clk_disable_unprepare(res->master_clk);
751 clk_disable_unprepare(res->slave_clk);
754 static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
756 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
757 struct dw_pcie *pci = pcie->pci;
758 struct device *dev = pci->dev;
762 ret = reset_control_assert(res->axi_m_reset);
764 dev_err(dev, "cannot assert axi master reset\n");
768 ret = reset_control_assert(res->axi_s_reset);
770 dev_err(dev, "cannot assert axi slave reset\n");
774 usleep_range(10000, 12000);
776 ret = reset_control_assert(res->pipe_reset);
778 dev_err(dev, "cannot assert pipe reset\n");
782 ret = reset_control_assert(res->pipe_sticky_reset);
784 dev_err(dev, "cannot assert pipe sticky reset\n");
788 ret = reset_control_assert(res->phy_reset);
790 dev_err(dev, "cannot assert phy reset\n");
794 ret = reset_control_assert(res->phy_ahb_reset);
796 dev_err(dev, "cannot assert phy ahb reset\n");
800 usleep_range(10000, 12000);
802 ret = reset_control_assert(res->axi_m_sticky_reset);
804 dev_err(dev, "cannot assert axi master sticky reset\n");
808 ret = reset_control_assert(res->pwr_reset);
810 dev_err(dev, "cannot assert power reset\n");
814 ret = reset_control_assert(res->ahb_reset);
816 dev_err(dev, "cannot assert ahb reset\n");
820 usleep_range(10000, 12000);
822 ret = reset_control_deassert(res->phy_ahb_reset);
824 dev_err(dev, "cannot deassert phy ahb reset\n");
828 ret = reset_control_deassert(res->phy_reset);
830 dev_err(dev, "cannot deassert phy reset\n");
834 ret = reset_control_deassert(res->pipe_reset);
836 dev_err(dev, "cannot deassert pipe reset\n");
840 ret = reset_control_deassert(res->pipe_sticky_reset);
842 dev_err(dev, "cannot deassert pipe sticky reset\n");
843 goto err_rst_pipe_sticky;
846 usleep_range(10000, 12000);
848 ret = reset_control_deassert(res->axi_m_reset);
850 dev_err(dev, "cannot deassert axi master reset\n");
854 ret = reset_control_deassert(res->axi_m_sticky_reset);
856 dev_err(dev, "cannot deassert axi master sticky reset\n");
857 goto err_rst_axi_m_sticky;
860 ret = reset_control_deassert(res->axi_s_reset);
862 dev_err(dev, "cannot deassert axi slave reset\n");
866 ret = reset_control_deassert(res->pwr_reset);
868 dev_err(dev, "cannot deassert power reset\n");
872 ret = reset_control_deassert(res->ahb_reset);
874 dev_err(dev, "cannot deassert ahb reset\n");
878 usleep_range(10000, 12000);
880 ret = clk_prepare_enable(res->aux_clk);
882 dev_err(dev, "cannot prepare/enable iface clock\n");
886 ret = clk_prepare_enable(res->master_clk);
888 dev_err(dev, "cannot prepare/enable core clock\n");
892 ret = clk_prepare_enable(res->slave_clk);
894 dev_err(dev, "cannot prepare/enable phy clock\n");
898 /* enable PCIe clocks and resets */
899 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
901 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
903 /* change DBI base address */
904 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
906 /* MAC PHY_POWERDOWN MUX DISABLE */
907 val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
909 writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
911 val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
913 writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
915 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
917 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
922 clk_disable_unprepare(res->master_clk);
924 clk_disable_unprepare(res->aux_clk);
926 reset_control_assert(res->ahb_reset);
928 reset_control_assert(res->pwr_reset);
930 reset_control_assert(res->axi_s_reset);
932 reset_control_assert(res->axi_m_sticky_reset);
933 err_rst_axi_m_sticky:
934 reset_control_assert(res->axi_m_reset);
936 reset_control_assert(res->pipe_sticky_reset);
938 reset_control_assert(res->pipe_reset);
940 reset_control_assert(res->phy_reset);
942 reset_control_assert(res->phy_ahb_reset);
946 static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
948 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
949 struct dw_pcie *pci = pcie->pci;
950 struct device *dev = pci->dev;
952 const char *rst_names[] = { "axi_m", "axi_s", "pipe",
953 "axi_m_sticky", "sticky",
956 res->iface = devm_clk_get(dev, "iface");
957 if (IS_ERR(res->iface))
958 return PTR_ERR(res->iface);
960 res->axi_m_clk = devm_clk_get(dev, "axi_m");
961 if (IS_ERR(res->axi_m_clk))
962 return PTR_ERR(res->axi_m_clk);
964 res->axi_s_clk = devm_clk_get(dev, "axi_s");
965 if (IS_ERR(res->axi_s_clk))
966 return PTR_ERR(res->axi_s_clk);
968 res->ahb_clk = devm_clk_get(dev, "ahb");
969 if (IS_ERR(res->ahb_clk))
970 return PTR_ERR(res->ahb_clk);
972 res->aux_clk = devm_clk_get(dev, "aux");
973 if (IS_ERR(res->aux_clk))
974 return PTR_ERR(res->aux_clk);
976 for (i = 0; i < ARRAY_SIZE(rst_names); i++) {
977 res->rst[i] = devm_reset_control_get(dev, rst_names[i]);
978 if (IS_ERR(res->rst[i]))
979 return PTR_ERR(res->rst[i]);
985 static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
987 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
989 clk_disable_unprepare(res->iface);
990 clk_disable_unprepare(res->axi_m_clk);
991 clk_disable_unprepare(res->axi_s_clk);
992 clk_disable_unprepare(res->ahb_clk);
993 clk_disable_unprepare(res->aux_clk);
996 static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
998 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
999 struct dw_pcie *pci = pcie->pci;
1000 struct device *dev = pci->dev;
1004 for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
1005 ret = reset_control_assert(res->rst[i]);
1007 dev_err(dev, "reset #%d assert failed (%d)\n", i, ret);
1012 usleep_range(2000, 2500);
1014 for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
1015 ret = reset_control_deassert(res->rst[i]);
1017 dev_err(dev, "reset #%d deassert failed (%d)\n", i,
1024 * Don't have a way to see if the reset has completed.
1025 * Wait for some time.
1027 usleep_range(2000, 2500);
1029 ret = clk_prepare_enable(res->iface);
1031 dev_err(dev, "cannot prepare/enable core clock\n");
1035 ret = clk_prepare_enable(res->axi_m_clk);
1037 dev_err(dev, "cannot prepare/enable core clock\n");
1041 ret = clk_prepare_enable(res->axi_s_clk);
1043 dev_err(dev, "cannot prepare/enable axi slave clock\n");
1047 ret = clk_prepare_enable(res->ahb_clk);
1049 dev_err(dev, "cannot prepare/enable ahb clock\n");
1053 ret = clk_prepare_enable(res->aux_clk);
1055 dev_err(dev, "cannot prepare/enable aux clock\n");
1059 writel(SLV_ADDR_SPACE_SZ,
1060 pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);
1062 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
1064 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
1066 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
1068 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
1069 | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
1070 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
1071 pcie->parf + PCIE20_PARF_SYS_CTRL);
1072 writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH);
1074 writel(CMD_BME_VAL, pci->dbi_base + PCIE20_COMMAND_STATUS);
1075 writel(DBI_RO_WR_EN, pci->dbi_base + PCIE20_MISC_CONTROL_1_REG);
1076 writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + PCIE20_CAP_LINK_1);
1078 val = readl(pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
1079 val &= ~PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT;
1080 writel(val, pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
1082 writel(PCIE_CAP_CPL_TIMEOUT_DISABLE, pci->dbi_base +
1083 PCIE20_DEVICE_CONTROL2_STATUS2);
1088 clk_disable_unprepare(res->ahb_clk);
1090 clk_disable_unprepare(res->axi_s_clk);
1092 clk_disable_unprepare(res->axi_m_clk);
1094 clk_disable_unprepare(res->iface);
1097 * Not checking for failure, will anyway return
1098 * the original failure in 'ret'.
1100 for (i = 0; i < ARRAY_SIZE(res->rst); i++)
1101 reset_control_assert(res->rst[i]);
1106 static int qcom_pcie_link_up(struct dw_pcie *pci)
1108 u16 val = readw(pci->dbi_base + PCIE20_CAP + PCI_EXP_LNKSTA);
1110 return !!(val & PCI_EXP_LNKSTA_DLLLA);
1113 static int qcom_pcie_host_init(struct pcie_port *pp)
1115 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1116 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1119 qcom_ep_reset_assert(pcie);
1121 ret = pcie->ops->init(pcie);
1125 ret = phy_power_on(pcie->phy);
1129 if (pcie->ops->post_init) {
1130 ret = pcie->ops->post_init(pcie);
1132 goto err_disable_phy;
1135 dw_pcie_setup_rc(pp);
1137 if (IS_ENABLED(CONFIG_PCI_MSI))
1138 dw_pcie_msi_init(pp);
1140 qcom_ep_reset_deassert(pcie);
1142 ret = qcom_pcie_establish_link(pcie);
1148 qcom_ep_reset_assert(pcie);
1149 if (pcie->ops->post_deinit)
1150 pcie->ops->post_deinit(pcie);
1152 phy_power_off(pcie->phy);
1154 pcie->ops->deinit(pcie);
1159 static int qcom_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
1162 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1164 /* the device class is not reported correctly from the register */
1165 if (where == PCI_CLASS_REVISION && size == 4) {
1166 *val = readl(pci->dbi_base + PCI_CLASS_REVISION);
1167 *val &= 0xff; /* keep revision id */
1168 *val |= PCI_CLASS_BRIDGE_PCI << 16;
1169 return PCIBIOS_SUCCESSFUL;
1172 return dw_pcie_read(pci->dbi_base + where, size, val);
1175 static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
1176 .host_init = qcom_pcie_host_init,
1177 .rd_own_conf = qcom_pcie_rd_own_conf,
1180 /* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */
1181 static const struct qcom_pcie_ops ops_2_1_0 = {
1182 .get_resources = qcom_pcie_get_resources_2_1_0,
1183 .init = qcom_pcie_init_2_1_0,
1184 .deinit = qcom_pcie_deinit_2_1_0,
1185 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1188 /* Qcom IP rev.: 1.0.0 Synopsys IP rev.: 4.11a */
1189 static const struct qcom_pcie_ops ops_1_0_0 = {
1190 .get_resources = qcom_pcie_get_resources_1_0_0,
1191 .init = qcom_pcie_init_1_0_0,
1192 .deinit = qcom_pcie_deinit_1_0_0,
1193 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1196 /* Qcom IP rev.: 2.3.2 Synopsys IP rev.: 4.21a */
1197 static const struct qcom_pcie_ops ops_2_3_2 = {
1198 .get_resources = qcom_pcie_get_resources_2_3_2,
1199 .init = qcom_pcie_init_2_3_2,
1200 .post_init = qcom_pcie_post_init_2_3_2,
1201 .deinit = qcom_pcie_deinit_2_3_2,
1202 .post_deinit = qcom_pcie_post_deinit_2_3_2,
1203 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1206 /* Qcom IP rev.: 2.4.0 Synopsys IP rev.: 4.20a */
1207 static const struct qcom_pcie_ops ops_2_4_0 = {
1208 .get_resources = qcom_pcie_get_resources_2_4_0,
1209 .init = qcom_pcie_init_2_4_0,
1210 .deinit = qcom_pcie_deinit_2_4_0,
1211 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1214 /* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */
1215 static const struct qcom_pcie_ops ops_2_3_3 = {
1216 .get_resources = qcom_pcie_get_resources_2_3_3,
1217 .init = qcom_pcie_init_2_3_3,
1218 .deinit = qcom_pcie_deinit_2_3_3,
1219 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1222 static const struct dw_pcie_ops dw_pcie_ops = {
1223 .link_up = qcom_pcie_link_up,
1226 static int qcom_pcie_probe(struct platform_device *pdev)
1228 struct device *dev = &pdev->dev;
1229 struct resource *res;
1230 struct pcie_port *pp;
1231 struct dw_pcie *pci;
1232 struct qcom_pcie *pcie;
1235 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1239 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1244 pci->ops = &dw_pcie_ops;
1249 pcie->ops = (struct qcom_pcie_ops *)of_device_get_match_data(dev);
1251 pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_LOW);
1252 if (IS_ERR(pcie->reset))
1253 return PTR_ERR(pcie->reset);
1255 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf");
1256 pcie->parf = devm_ioremap_resource(dev, res);
1257 if (IS_ERR(pcie->parf))
1258 return PTR_ERR(pcie->parf);
1260 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
1261 pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
1262 if (IS_ERR(pci->dbi_base))
1263 return PTR_ERR(pci->dbi_base);
1265 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
1266 pcie->elbi = devm_ioremap_resource(dev, res);
1267 if (IS_ERR(pcie->elbi))
1268 return PTR_ERR(pcie->elbi);
1270 pcie->phy = devm_phy_optional_get(dev, "pciephy");
1271 if (IS_ERR(pcie->phy))
1272 return PTR_ERR(pcie->phy);
1274 ret = pcie->ops->get_resources(pcie);
1278 pp->root_bus_nr = -1;
1279 pp->ops = &qcom_pcie_dw_ops;
1281 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1282 pp->msi_irq = platform_get_irq_byname(pdev, "msi");
1283 if (pp->msi_irq < 0)
1286 ret = devm_request_irq(dev, pp->msi_irq,
1287 qcom_pcie_msi_irq_handler,
1288 IRQF_SHARED | IRQF_NO_THREAD,
1289 "qcom-pcie-msi", pp);
1291 dev_err(dev, "cannot request msi irq\n");
1296 ret = phy_init(pcie->phy);
1300 platform_set_drvdata(pdev, pcie);
1302 ret = dw_pcie_host_init(pp);
1304 dev_err(dev, "cannot initialize host\n");
1311 static const struct of_device_id qcom_pcie_match[] = {
1312 { .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
1313 { .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 },
1314 { .compatible = "qcom,pcie-apq8064", .data = &ops_2_1_0 },
1315 { .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
1316 { .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
1317 { .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
1321 static struct platform_driver qcom_pcie_driver = {
1322 .probe = qcom_pcie_probe,
1324 .name = "qcom-pcie",
1325 .suppress_bind_attrs = true,
1326 .of_match_table = qcom_pcie_match,
1329 builtin_platform_driver(qcom_pcie_driver);