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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Qualcomm PCIe root complex driver
4 *
5 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
6 * Copyright 2015 Linaro Limited.
7 *
8 * Author: Stanimir Varbanov <svarbanov@mm-sol.com>
9 */
10
11#include <linux/clk.h>
12#include <linux/crc8.h>
13#include <linux/debugfs.h>
14#include <linux/delay.h>
15#include <linux/gpio/consumer.h>
16#include <linux/interconnect.h>
17#include <linux/interrupt.h>
18#include <linux/io.h>
19#include <linux/iopoll.h>
20#include <linux/kernel.h>
21#include <linux/init.h>
22#include <linux/of.h>
23#include <linux/of_gpio.h>
24#include <linux/pci.h>
25#include <linux/pm_runtime.h>
26#include <linux/platform_device.h>
27#include <linux/phy/pcie.h>
28#include <linux/phy/phy.h>
29#include <linux/regulator/consumer.h>
30#include <linux/reset.h>
31#include <linux/slab.h>
32#include <linux/types.h>
33
34#include "../../pci.h"
35#include "pcie-designware.h"
36
37/* PARF registers */
38#define PARF_SYS_CTRL 0x00
39#define PARF_PM_CTRL 0x20
40#define PARF_PCS_DEEMPH 0x34
41#define PARF_PCS_SWING 0x38
42#define PARF_PHY_CTRL 0x40
43#define PARF_PHY_REFCLK 0x4c
44#define PARF_CONFIG_BITS 0x50
45#define PARF_DBI_BASE_ADDR 0x168
46#define PARF_MHI_CLOCK_RESET_CTRL 0x174
47#define PARF_AXI_MSTR_WR_ADDR_HALT 0x178
48#define PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1a8
49#define PARF_Q2A_FLUSH 0x1ac
50#define PARF_LTSSM 0x1b0
51#define PARF_SID_OFFSET 0x234
52#define PARF_BDF_TRANSLATE_CFG 0x24c
53#define PARF_SLV_ADDR_SPACE_SIZE 0x358
54#define PARF_DEVICE_TYPE 0x1000
55#define PARF_BDF_TO_SID_TABLE_N 0x2000
56
57/* ELBI registers */
58#define ELBI_SYS_CTRL 0x04
59
60/* DBI registers */
61#define AXI_MSTR_RESP_COMP_CTRL0 0x818
62#define AXI_MSTR_RESP_COMP_CTRL1 0x81c
63
64/* MHI registers */
65#define PARF_DEBUG_CNT_PM_LINKST_IN_L2 0xc04
66#define PARF_DEBUG_CNT_PM_LINKST_IN_L1 0xc0c
67#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S 0xc10
68#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1 0xc84
69#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2 0xc88
70
71/* PARF_SYS_CTRL register fields */
72#define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN BIT(29)
73#define MST_WAKEUP_EN BIT(13)
74#define SLV_WAKEUP_EN BIT(12)
75#define MSTR_ACLK_CGC_DIS BIT(10)
76#define SLV_ACLK_CGC_DIS BIT(9)
77#define CORE_CLK_CGC_DIS BIT(6)
78#define AUX_PWR_DET BIT(4)
79#define L23_CLK_RMV_DIS BIT(2)
80#define L1_CLK_RMV_DIS BIT(1)
81
82/* PARF_PM_CTRL register fields */
83#define REQ_NOT_ENTR_L1 BIT(5)
84
85/* PARF_PCS_DEEMPH register fields */
86#define PCS_DEEMPH_TX_DEEMPH_GEN1(x) FIELD_PREP(GENMASK(21, 16), x)
87#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) FIELD_PREP(GENMASK(13, 8), x)
88#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x) FIELD_PREP(GENMASK(5, 0), x)
89
90/* PARF_PCS_SWING register fields */
91#define PCS_SWING_TX_SWING_FULL(x) FIELD_PREP(GENMASK(14, 8), x)
92#define PCS_SWING_TX_SWING_LOW(x) FIELD_PREP(GENMASK(6, 0), x)
93
94/* PARF_PHY_CTRL register fields */
95#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK GENMASK(20, 16)
96#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x) FIELD_PREP(PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK, x)
97#define PHY_TEST_PWR_DOWN BIT(0)
98
99/* PARF_PHY_REFCLK register fields */
100#define PHY_REFCLK_SSP_EN BIT(16)
101#define PHY_REFCLK_USE_PAD BIT(12)
102
103/* PARF_CONFIG_BITS register fields */
104#define PHY_RX0_EQ(x) FIELD_PREP(GENMASK(26, 24), x)
105
106/* PARF_SLV_ADDR_SPACE_SIZE register value */
107#define SLV_ADDR_SPACE_SZ 0x10000000
108
109/* PARF_MHI_CLOCK_RESET_CTRL register fields */
110#define AHB_CLK_EN BIT(0)
111#define MSTR_AXI_CLK_EN BIT(1)
112#define BYPASS BIT(4)
113
114/* PARF_AXI_MSTR_WR_ADDR_HALT register fields */
115#define EN BIT(31)
116
117/* PARF_LTSSM register fields */
118#define LTSSM_EN BIT(8)
119
120/* PARF_DEVICE_TYPE register fields */
121#define DEVICE_TYPE_RC 0x4
122
123/* ELBI_SYS_CTRL register fields */
124#define ELBI_SYS_CTRL_LT_ENABLE BIT(0)
125
126/* AXI_MSTR_RESP_COMP_CTRL0 register fields */
127#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K 0x4
128#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K 0x5
129
130/* AXI_MSTR_RESP_COMP_CTRL1 register fields */
131#define CFG_BRIDGE_SB_INIT BIT(0)
132
133/* PCI_EXP_SLTCAP register fields */
134#define PCIE_CAP_SLOT_POWER_LIMIT_VAL FIELD_PREP(PCI_EXP_SLTCAP_SPLV, 250)
135#define PCIE_CAP_SLOT_POWER_LIMIT_SCALE FIELD_PREP(PCI_EXP_SLTCAP_SPLS, 1)
136#define PCIE_CAP_SLOT_VAL (PCI_EXP_SLTCAP_ABP | \
137 PCI_EXP_SLTCAP_PCP | \
138 PCI_EXP_SLTCAP_MRLSP | \
139 PCI_EXP_SLTCAP_AIP | \
140 PCI_EXP_SLTCAP_PIP | \
141 PCI_EXP_SLTCAP_HPS | \
142 PCI_EXP_SLTCAP_EIP | \
143 PCIE_CAP_SLOT_POWER_LIMIT_VAL | \
144 PCIE_CAP_SLOT_POWER_LIMIT_SCALE)
145
146#define PERST_DELAY_US 1000
147
148#define QCOM_PCIE_CRC8_POLYNOMIAL (BIT(2) | BIT(1) | BIT(0))
149
150#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \
151 Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed]))
152
153#define QCOM_PCIE_1_0_0_MAX_CLOCKS 4
154struct qcom_pcie_resources_1_0_0 {
155 struct clk_bulk_data clks[QCOM_PCIE_1_0_0_MAX_CLOCKS];
156 struct reset_control *core;
157 struct regulator *vdda;
158};
159
160#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5
161#define QCOM_PCIE_2_1_0_MAX_RESETS 6
162#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
163struct qcom_pcie_resources_2_1_0 {
164 struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
165 struct reset_control_bulk_data resets[QCOM_PCIE_2_1_0_MAX_RESETS];
166 int num_resets;
167 struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
168};
169
170#define QCOM_PCIE_2_3_2_MAX_CLOCKS 4
171#define QCOM_PCIE_2_3_2_MAX_SUPPLY 2
172struct qcom_pcie_resources_2_3_2 {
173 struct clk_bulk_data clks[QCOM_PCIE_2_3_2_MAX_CLOCKS];
174 struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
175};
176
177#define QCOM_PCIE_2_3_3_MAX_CLOCKS 5
178#define QCOM_PCIE_2_3_3_MAX_RESETS 7
179struct qcom_pcie_resources_2_3_3 {
180 struct clk_bulk_data clks[QCOM_PCIE_2_3_3_MAX_CLOCKS];
181 struct reset_control_bulk_data rst[QCOM_PCIE_2_3_3_MAX_RESETS];
182};
183
184#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4
185#define QCOM_PCIE_2_4_0_MAX_RESETS 12
186struct qcom_pcie_resources_2_4_0 {
187 struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
188 int num_clks;
189 struct reset_control_bulk_data resets[QCOM_PCIE_2_4_0_MAX_RESETS];
190 int num_resets;
191};
192
193#define QCOM_PCIE_2_7_0_MAX_CLOCKS 15
194#define QCOM_PCIE_2_7_0_MAX_SUPPLIES 2
195struct qcom_pcie_resources_2_7_0 {
196 struct clk_bulk_data clks[QCOM_PCIE_2_7_0_MAX_CLOCKS];
197 int num_clks;
198 struct regulator_bulk_data supplies[QCOM_PCIE_2_7_0_MAX_SUPPLIES];
199 struct reset_control *rst;
200};
201
202#define QCOM_PCIE_2_9_0_MAX_CLOCKS 5
203struct qcom_pcie_resources_2_9_0 {
204 struct clk_bulk_data clks[QCOM_PCIE_2_9_0_MAX_CLOCKS];
205 struct reset_control *rst;
206};
207
208union qcom_pcie_resources {
209 struct qcom_pcie_resources_1_0_0 v1_0_0;
210 struct qcom_pcie_resources_2_1_0 v2_1_0;
211 struct qcom_pcie_resources_2_3_2 v2_3_2;
212 struct qcom_pcie_resources_2_3_3 v2_3_3;
213 struct qcom_pcie_resources_2_4_0 v2_4_0;
214 struct qcom_pcie_resources_2_7_0 v2_7_0;
215 struct qcom_pcie_resources_2_9_0 v2_9_0;
216};
217
218struct qcom_pcie;
219
220struct qcom_pcie_ops {
221 int (*get_resources)(struct qcom_pcie *pcie);
222 int (*init)(struct qcom_pcie *pcie);
223 int (*post_init)(struct qcom_pcie *pcie);
224 void (*host_post_init)(struct qcom_pcie *pcie);
225 void (*deinit)(struct qcom_pcie *pcie);
226 void (*ltssm_enable)(struct qcom_pcie *pcie);
227 int (*config_sid)(struct qcom_pcie *pcie);
228};
229
230struct qcom_pcie_cfg {
231 const struct qcom_pcie_ops *ops;
232};
233
234struct qcom_pcie {
235 struct dw_pcie *pci;
236 void __iomem *parf; /* DT parf */
237 void __iomem *elbi; /* DT elbi */
238 void __iomem *mhi;
239 union qcom_pcie_resources res;
240 struct phy *phy;
241 struct gpio_desc *reset;
242 struct icc_path *icc_mem;
243 const struct qcom_pcie_cfg *cfg;
244 struct dentry *debugfs;
245 bool suspended;
246};
247
248#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
249
250static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
251{
252 gpiod_set_value_cansleep(pcie->reset, 1);
253 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
254}
255
256static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
257{
258 /* Ensure that PERST has been asserted for at least 100 ms */
259 msleep(100);
260 gpiod_set_value_cansleep(pcie->reset, 0);
261 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
262}
263
264static int qcom_pcie_start_link(struct dw_pcie *pci)
265{
266 struct qcom_pcie *pcie = to_qcom_pcie(pci);
267
268 /* Enable Link Training state machine */
269 if (pcie->cfg->ops->ltssm_enable)
270 pcie->cfg->ops->ltssm_enable(pcie);
271
272 return 0;
273}
274
275static void qcom_pcie_clear_hpc(struct dw_pcie *pci)
276{
277 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
278 u32 val;
279
280 dw_pcie_dbi_ro_wr_en(pci);
281
282 val = readl(pci->dbi_base + offset + PCI_EXP_SLTCAP);
283 val &= ~PCI_EXP_SLTCAP_HPC;
284 writel(val, pci->dbi_base + offset + PCI_EXP_SLTCAP);
285
286 dw_pcie_dbi_ro_wr_dis(pci);
287}
288
289static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
290{
291 u32 val;
292
293 /* enable link training */
294 val = readl(pcie->elbi + ELBI_SYS_CTRL);
295 val |= ELBI_SYS_CTRL_LT_ENABLE;
296 writel(val, pcie->elbi + ELBI_SYS_CTRL);
297}
298
299static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
300{
301 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
302 struct dw_pcie *pci = pcie->pci;
303 struct device *dev = pci->dev;
304 bool is_apq = of_device_is_compatible(dev->of_node, "qcom,pcie-apq8064");
305 int ret;
306
307 res->supplies[0].supply = "vdda";
308 res->supplies[1].supply = "vdda_phy";
309 res->supplies[2].supply = "vdda_refclk";
310 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
311 res->supplies);
312 if (ret)
313 return ret;
314
315 res->clks[0].id = "iface";
316 res->clks[1].id = "core";
317 res->clks[2].id = "phy";
318 res->clks[3].id = "aux";
319 res->clks[4].id = "ref";
320
321 /* iface, core, phy are required */
322 ret = devm_clk_bulk_get(dev, 3, res->clks);
323 if (ret < 0)
324 return ret;
325
326 /* aux, ref are optional */
327 ret = devm_clk_bulk_get_optional(dev, 2, res->clks + 3);
328 if (ret < 0)
329 return ret;
330
331 res->resets[0].id = "pci";
332 res->resets[1].id = "axi";
333 res->resets[2].id = "ahb";
334 res->resets[3].id = "por";
335 res->resets[4].id = "phy";
336 res->resets[5].id = "ext";
337
338 /* ext is optional on APQ8016 */
339 res->num_resets = is_apq ? 5 : 6;
340 ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
341 if (ret < 0)
342 return ret;
343
344 return 0;
345}
346
347static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
348{
349 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
350
351 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
352 reset_control_bulk_assert(res->num_resets, res->resets);
353
354 writel(1, pcie->parf + PARF_PHY_CTRL);
355
356 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
357}
358
359static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
360{
361 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
362 struct dw_pcie *pci = pcie->pci;
363 struct device *dev = pci->dev;
364 int ret;
365
366 /* reset the PCIe interface as uboot can leave it undefined state */
367 ret = reset_control_bulk_assert(res->num_resets, res->resets);
368 if (ret < 0) {
369 dev_err(dev, "cannot assert resets\n");
370 return ret;
371 }
372
373 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
374 if (ret < 0) {
375 dev_err(dev, "cannot enable regulators\n");
376 return ret;
377 }
378
379 ret = reset_control_bulk_deassert(res->num_resets, res->resets);
380 if (ret < 0) {
381 dev_err(dev, "cannot deassert resets\n");
382 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
383 return ret;
384 }
385
386 return 0;
387}
388
389static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
390{
391 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
392 struct dw_pcie *pci = pcie->pci;
393 struct device *dev = pci->dev;
394 struct device_node *node = dev->of_node;
395 u32 val;
396 int ret;
397
398 /* enable PCIe clocks and resets */
399 val = readl(pcie->parf + PARF_PHY_CTRL);
400 val &= ~PHY_TEST_PWR_DOWN;
401 writel(val, pcie->parf + PARF_PHY_CTRL);
402
403 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
404 if (ret)
405 return ret;
406
407 if (of_device_is_compatible(node, "qcom,pcie-ipq8064") ||
408 of_device_is_compatible(node, "qcom,pcie-ipq8064-v2")) {
409 writel(PCS_DEEMPH_TX_DEEMPH_GEN1(24) |
410 PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(24) |
411 PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(34),
412 pcie->parf + PARF_PCS_DEEMPH);
413 writel(PCS_SWING_TX_SWING_FULL(120) |
414 PCS_SWING_TX_SWING_LOW(120),
415 pcie->parf + PARF_PCS_SWING);
416 writel(PHY_RX0_EQ(4), pcie->parf + PARF_CONFIG_BITS);
417 }
418
419 if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) {
420 /* set TX termination offset */
421 val = readl(pcie->parf + PARF_PHY_CTRL);
422 val &= ~PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK;
423 val |= PHY_CTRL_PHY_TX0_TERM_OFFSET(7);
424 writel(val, pcie->parf + PARF_PHY_CTRL);
425 }
426
427 /* enable external reference clock */
428 val = readl(pcie->parf + PARF_PHY_REFCLK);
429 /* USE_PAD is required only for ipq806x */
430 if (!of_device_is_compatible(node, "qcom,pcie-apq8064"))
431 val &= ~PHY_REFCLK_USE_PAD;
432 val |= PHY_REFCLK_SSP_EN;
433 writel(val, pcie->parf + PARF_PHY_REFCLK);
434
435 /* wait for clock acquisition */
436 usleep_range(1000, 1500);
437
438 /* Set the Max TLP size to 2K, instead of using default of 4K */
439 writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
440 pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL0);
441 writel(CFG_BRIDGE_SB_INIT,
442 pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL1);
443
444 qcom_pcie_clear_hpc(pcie->pci);
445
446 return 0;
447}
448
449static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie)
450{
451 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
452 struct dw_pcie *pci = pcie->pci;
453 struct device *dev = pci->dev;
454 int ret;
455
456 res->vdda = devm_regulator_get(dev, "vdda");
457 if (IS_ERR(res->vdda))
458 return PTR_ERR(res->vdda);
459
460 res->clks[0].id = "iface";
461 res->clks[1].id = "aux";
462 res->clks[2].id = "master_bus";
463 res->clks[3].id = "slave_bus";
464
465 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
466 if (ret < 0)
467 return ret;
468
469 res->core = devm_reset_control_get_exclusive(dev, "core");
470 return PTR_ERR_OR_ZERO(res->core);
471}
472
473static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie)
474{
475 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
476
477 reset_control_assert(res->core);
478 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
479 regulator_disable(res->vdda);
480}
481
482static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
483{
484 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
485 struct dw_pcie *pci = pcie->pci;
486 struct device *dev = pci->dev;
487 int ret;
488
489 ret = reset_control_deassert(res->core);
490 if (ret) {
491 dev_err(dev, "cannot deassert core reset\n");
492 return ret;
493 }
494
495 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
496 if (ret) {
497 dev_err(dev, "cannot prepare/enable clocks\n");
498 goto err_assert_reset;
499 }
500
501 ret = regulator_enable(res->vdda);
502 if (ret) {
503 dev_err(dev, "cannot enable vdda regulator\n");
504 goto err_disable_clks;
505 }
506
507 return 0;
508
509err_disable_clks:
510 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
511err_assert_reset:
512 reset_control_assert(res->core);
513
514 return ret;
515}
516
517static int qcom_pcie_post_init_1_0_0(struct qcom_pcie *pcie)
518{
519 /* change DBI base address */
520 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
521
522 if (IS_ENABLED(CONFIG_PCI_MSI)) {
523 u32 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
524
525 val |= EN;
526 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
527 }
528
529 qcom_pcie_clear_hpc(pcie->pci);
530
531 return 0;
532}
533
534static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
535{
536 u32 val;
537
538 /* enable link training */
539 val = readl(pcie->parf + PARF_LTSSM);
540 val |= LTSSM_EN;
541 writel(val, pcie->parf + PARF_LTSSM);
542}
543
544static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
545{
546 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
547 struct dw_pcie *pci = pcie->pci;
548 struct device *dev = pci->dev;
549 int ret;
550
551 res->supplies[0].supply = "vdda";
552 res->supplies[1].supply = "vddpe-3v3";
553 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
554 res->supplies);
555 if (ret)
556 return ret;
557
558 res->clks[0].id = "aux";
559 res->clks[1].id = "cfg";
560 res->clks[2].id = "bus_master";
561 res->clks[3].id = "bus_slave";
562
563 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
564 if (ret < 0)
565 return ret;
566
567 return 0;
568}
569
570static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
571{
572 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
573
574 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
575 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
576}
577
578static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
579{
580 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
581 struct dw_pcie *pci = pcie->pci;
582 struct device *dev = pci->dev;
583 int ret;
584
585 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
586 if (ret < 0) {
587 dev_err(dev, "cannot enable regulators\n");
588 return ret;
589 }
590
591 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
592 if (ret) {
593 dev_err(dev, "cannot prepare/enable clocks\n");
594 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
595 return ret;
596 }
597
598 return 0;
599}
600
601static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
602{
603 u32 val;
604
605 /* enable PCIe clocks and resets */
606 val = readl(pcie->parf + PARF_PHY_CTRL);
607 val &= ~PHY_TEST_PWR_DOWN;
608 writel(val, pcie->parf + PARF_PHY_CTRL);
609
610 /* change DBI base address */
611 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
612
613 /* MAC PHY_POWERDOWN MUX DISABLE */
614 val = readl(pcie->parf + PARF_SYS_CTRL);
615 val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
616 writel(val, pcie->parf + PARF_SYS_CTRL);
617
618 val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
619 val |= BYPASS;
620 writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
621
622 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
623 val |= EN;
624 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
625
626 qcom_pcie_clear_hpc(pcie->pci);
627
628 return 0;
629}
630
631static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
632{
633 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
634 struct dw_pcie *pci = pcie->pci;
635 struct device *dev = pci->dev;
636 bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019");
637 int ret;
638
639 res->clks[0].id = "aux";
640 res->clks[1].id = "master_bus";
641 res->clks[2].id = "slave_bus";
642 res->clks[3].id = "iface";
643
644 /* qcom,pcie-ipq4019 is defined without "iface" */
645 res->num_clks = is_ipq ? 3 : 4;
646
647 ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
648 if (ret < 0)
649 return ret;
650
651 res->resets[0].id = "axi_m";
652 res->resets[1].id = "axi_s";
653 res->resets[2].id = "axi_m_sticky";
654 res->resets[3].id = "pipe_sticky";
655 res->resets[4].id = "pwr";
656 res->resets[5].id = "ahb";
657 res->resets[6].id = "pipe";
658 res->resets[7].id = "axi_m_vmid";
659 res->resets[8].id = "axi_s_xpu";
660 res->resets[9].id = "parf";
661 res->resets[10].id = "phy";
662 res->resets[11].id = "phy_ahb";
663
664 res->num_resets = is_ipq ? 12 : 6;
665
666 ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
667 if (ret < 0)
668 return ret;
669
670 return 0;
671}
672
673static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
674{
675 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
676
677 reset_control_bulk_assert(res->num_resets, res->resets);
678 clk_bulk_disable_unprepare(res->num_clks, res->clks);
679}
680
681static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
682{
683 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
684 struct dw_pcie *pci = pcie->pci;
685 struct device *dev = pci->dev;
686 int ret;
687
688 ret = reset_control_bulk_assert(res->num_resets, res->resets);
689 if (ret < 0) {
690 dev_err(dev, "cannot assert resets\n");
691 return ret;
692 }
693
694 usleep_range(10000, 12000);
695
696 ret = reset_control_bulk_deassert(res->num_resets, res->resets);
697 if (ret < 0) {
698 dev_err(dev, "cannot deassert resets\n");
699 return ret;
700 }
701
702 usleep_range(10000, 12000);
703
704 ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
705 if (ret) {
706 reset_control_bulk_assert(res->num_resets, res->resets);
707 return ret;
708 }
709
710 return 0;
711}
712
713static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
714{
715 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
716 struct dw_pcie *pci = pcie->pci;
717 struct device *dev = pci->dev;
718 int ret;
719
720 res->clks[0].id = "iface";
721 res->clks[1].id = "axi_m";
722 res->clks[2].id = "axi_s";
723 res->clks[3].id = "ahb";
724 res->clks[4].id = "aux";
725
726 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
727 if (ret < 0)
728 return ret;
729
730 res->rst[0].id = "axi_m";
731 res->rst[1].id = "axi_s";
732 res->rst[2].id = "pipe";
733 res->rst[3].id = "axi_m_sticky";
734 res->rst[4].id = "sticky";
735 res->rst[5].id = "ahb";
736 res->rst[6].id = "sleep";
737
738 ret = devm_reset_control_bulk_get_exclusive(dev, ARRAY_SIZE(res->rst), res->rst);
739 if (ret < 0)
740 return ret;
741
742 return 0;
743}
744
745static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
746{
747 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
748
749 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
750}
751
752static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
753{
754 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
755 struct dw_pcie *pci = pcie->pci;
756 struct device *dev = pci->dev;
757 int ret;
758
759 ret = reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
760 if (ret < 0) {
761 dev_err(dev, "cannot assert resets\n");
762 return ret;
763 }
764
765 usleep_range(2000, 2500);
766
767 ret = reset_control_bulk_deassert(ARRAY_SIZE(res->rst), res->rst);
768 if (ret < 0) {
769 dev_err(dev, "cannot deassert resets\n");
770 return ret;
771 }
772
773 /*
774 * Don't have a way to see if the reset has completed.
775 * Wait for some time.
776 */
777 usleep_range(2000, 2500);
778
779 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
780 if (ret) {
781 dev_err(dev, "cannot prepare/enable clocks\n");
782 goto err_assert_resets;
783 }
784
785 return 0;
786
787err_assert_resets:
788 /*
789 * Not checking for failure, will anyway return
790 * the original failure in 'ret'.
791 */
792 reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
793
794 return ret;
795}
796
797static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
798{
799 struct dw_pcie *pci = pcie->pci;
800 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
801 u32 val;
802
803 writel(SLV_ADDR_SPACE_SZ, pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
804
805 val = readl(pcie->parf + PARF_PHY_CTRL);
806 val &= ~PHY_TEST_PWR_DOWN;
807 writel(val, pcie->parf + PARF_PHY_CTRL);
808
809 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
810
811 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
812 | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
813 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
814 pcie->parf + PARF_SYS_CTRL);
815 writel(0, pcie->parf + PARF_Q2A_FLUSH);
816
817 writel(PCI_COMMAND_MASTER, pci->dbi_base + PCI_COMMAND);
818
819 dw_pcie_dbi_ro_wr_en(pci);
820
821 writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
822
823 val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
824 val &= ~PCI_EXP_LNKCAP_ASPMS;
825 writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP);
826
827 writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset +
828 PCI_EXP_DEVCTL2);
829
830 dw_pcie_dbi_ro_wr_dis(pci);
831
832 return 0;
833}
834
835static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
836{
837 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
838 struct dw_pcie *pci = pcie->pci;
839 struct device *dev = pci->dev;
840 unsigned int num_clks, num_opt_clks;
841 unsigned int idx;
842 int ret;
843
844 res->rst = devm_reset_control_array_get_exclusive(dev);
845 if (IS_ERR(res->rst))
846 return PTR_ERR(res->rst);
847
848 res->supplies[0].supply = "vdda";
849 res->supplies[1].supply = "vddpe-3v3";
850 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
851 res->supplies);
852 if (ret)
853 return ret;
854
855 idx = 0;
856 res->clks[idx++].id = "aux";
857 res->clks[idx++].id = "cfg";
858 res->clks[idx++].id = "bus_master";
859 res->clks[idx++].id = "bus_slave";
860 res->clks[idx++].id = "slave_q2a";
861
862 num_clks = idx;
863
864 ret = devm_clk_bulk_get(dev, num_clks, res->clks);
865 if (ret < 0)
866 return ret;
867
868 res->clks[idx++].id = "tbu";
869 res->clks[idx++].id = "ddrss_sf_tbu";
870 res->clks[idx++].id = "aggre0";
871 res->clks[idx++].id = "aggre1";
872 res->clks[idx++].id = "noc_aggr";
873 res->clks[idx++].id = "noc_aggr_4";
874 res->clks[idx++].id = "noc_aggr_south_sf";
875 res->clks[idx++].id = "cnoc_qx";
876 res->clks[idx++].id = "sleep";
877 res->clks[idx++].id = "cnoc_sf_axi";
878
879 num_opt_clks = idx - num_clks;
880 res->num_clks = idx;
881
882 ret = devm_clk_bulk_get_optional(dev, num_opt_clks, res->clks + num_clks);
883 if (ret < 0)
884 return ret;
885
886 return 0;
887}
888
889static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
890{
891 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
892 struct dw_pcie *pci = pcie->pci;
893 struct device *dev = pci->dev;
894 u32 val;
895 int ret;
896
897 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
898 if (ret < 0) {
899 dev_err(dev, "cannot enable regulators\n");
900 return ret;
901 }
902
903 ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
904 if (ret < 0)
905 goto err_disable_regulators;
906
907 ret = reset_control_assert(res->rst);
908 if (ret) {
909 dev_err(dev, "reset assert failed (%d)\n", ret);
910 goto err_disable_clocks;
911 }
912
913 usleep_range(1000, 1500);
914
915 ret = reset_control_deassert(res->rst);
916 if (ret) {
917 dev_err(dev, "reset deassert failed (%d)\n", ret);
918 goto err_disable_clocks;
919 }
920
921 /* Wait for reset to complete, required on SM8450 */
922 usleep_range(1000, 1500);
923
924 /* configure PCIe to RC mode */
925 writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
926
927 /* enable PCIe clocks and resets */
928 val = readl(pcie->parf + PARF_PHY_CTRL);
929 val &= ~PHY_TEST_PWR_DOWN;
930 writel(val, pcie->parf + PARF_PHY_CTRL);
931
932 /* change DBI base address */
933 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
934
935 /* MAC PHY_POWERDOWN MUX DISABLE */
936 val = readl(pcie->parf + PARF_SYS_CTRL);
937 val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
938 writel(val, pcie->parf + PARF_SYS_CTRL);
939
940 val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
941 val |= BYPASS;
942 writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
943
944 /* Enable L1 and L1SS */
945 val = readl(pcie->parf + PARF_PM_CTRL);
946 val &= ~REQ_NOT_ENTR_L1;
947 writel(val, pcie->parf + PARF_PM_CTRL);
948
949 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
950 val |= EN;
951 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
952
953 return 0;
954err_disable_clocks:
955 clk_bulk_disable_unprepare(res->num_clks, res->clks);
956err_disable_regulators:
957 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
958
959 return ret;
960}
961
962static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie)
963{
964 qcom_pcie_clear_hpc(pcie->pci);
965
966 return 0;
967}
968
969static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata)
970{
971 /*
972 * Downstream devices need to be in D0 state before enabling PCI PM
973 * substates.
974 */
975 pci_set_power_state_locked(pdev, PCI_D0);
976 pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
977
978 return 0;
979}
980
981static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie)
982{
983 struct dw_pcie_rp *pp = &pcie->pci->pp;
984
985 pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL);
986}
987
988static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
989{
990 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
991
992 clk_bulk_disable_unprepare(res->num_clks, res->clks);
993
994 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
995}
996
997static int qcom_pcie_config_sid_1_9_0(struct qcom_pcie *pcie)
998{
999 /* iommu map structure */
1000 struct {
1001 u32 bdf;
1002 u32 phandle;
1003 u32 smmu_sid;
1004 u32 smmu_sid_len;
1005 } *map;
1006 void __iomem *bdf_to_sid_base = pcie->parf + PARF_BDF_TO_SID_TABLE_N;
1007 struct device *dev = pcie->pci->dev;
1008 u8 qcom_pcie_crc8_table[CRC8_TABLE_SIZE];
1009 int i, nr_map, size = 0;
1010 u32 smmu_sid_base;
1011
1012 of_get_property(dev->of_node, "iommu-map", &size);
1013 if (!size)
1014 return 0;
1015
1016 map = kzalloc(size, GFP_KERNEL);
1017 if (!map)
1018 return -ENOMEM;
1019
1020 of_property_read_u32_array(dev->of_node, "iommu-map", (u32 *)map,
1021 size / sizeof(u32));
1022
1023 nr_map = size / (sizeof(*map));
1024
1025 crc8_populate_msb(qcom_pcie_crc8_table, QCOM_PCIE_CRC8_POLYNOMIAL);
1026
1027 /* Registers need to be zero out first */
1028 memset_io(bdf_to_sid_base, 0, CRC8_TABLE_SIZE * sizeof(u32));
1029
1030 /* Extract the SMMU SID base from the first entry of iommu-map */
1031 smmu_sid_base = map[0].smmu_sid;
1032
1033 /* Look for an available entry to hold the mapping */
1034 for (i = 0; i < nr_map; i++) {
1035 __be16 bdf_be = cpu_to_be16(map[i].bdf);
1036 u32 val;
1037 u8 hash;
1038
1039 hash = crc8(qcom_pcie_crc8_table, (u8 *)&bdf_be, sizeof(bdf_be), 0);
1040
1041 val = readl(bdf_to_sid_base + hash * sizeof(u32));
1042
1043 /* If the register is already populated, look for next available entry */
1044 while (val) {
1045 u8 current_hash = hash++;
1046 u8 next_mask = 0xff;
1047
1048 /* If NEXT field is NULL then update it with next hash */
1049 if (!(val & next_mask)) {
1050 val |= (u32)hash;
1051 writel(val, bdf_to_sid_base + current_hash * sizeof(u32));
1052 }
1053
1054 val = readl(bdf_to_sid_base + hash * sizeof(u32));
1055 }
1056
1057 /* BDF [31:16] | SID [15:8] | NEXT [7:0] */
1058 val = map[i].bdf << 16 | (map[i].smmu_sid - smmu_sid_base) << 8 | 0;
1059 writel(val, bdf_to_sid_base + hash * sizeof(u32));
1060 }
1061
1062 kfree(map);
1063
1064 return 0;
1065}
1066
1067static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
1068{
1069 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1070 struct dw_pcie *pci = pcie->pci;
1071 struct device *dev = pci->dev;
1072 int ret;
1073
1074 res->clks[0].id = "iface";
1075 res->clks[1].id = "axi_m";
1076 res->clks[2].id = "axi_s";
1077 res->clks[3].id = "axi_bridge";
1078 res->clks[4].id = "rchng";
1079
1080 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
1081 if (ret < 0)
1082 return ret;
1083
1084 res->rst = devm_reset_control_array_get_exclusive(dev);
1085 if (IS_ERR(res->rst))
1086 return PTR_ERR(res->rst);
1087
1088 return 0;
1089}
1090
1091static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie)
1092{
1093 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1094
1095 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
1096}
1097
1098static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
1099{
1100 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1101 struct device *dev = pcie->pci->dev;
1102 int ret;
1103
1104 ret = reset_control_assert(res->rst);
1105 if (ret) {
1106 dev_err(dev, "reset assert failed (%d)\n", ret);
1107 return ret;
1108 }
1109
1110 /*
1111 * Delay periods before and after reset deassert are working values
1112 * from downstream Codeaurora kernel
1113 */
1114 usleep_range(2000, 2500);
1115
1116 ret = reset_control_deassert(res->rst);
1117 if (ret) {
1118 dev_err(dev, "reset deassert failed (%d)\n", ret);
1119 return ret;
1120 }
1121
1122 usleep_range(2000, 2500);
1123
1124 return clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
1125}
1126
1127static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
1128{
1129 struct dw_pcie *pci = pcie->pci;
1130 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1131 u32 val;
1132 int i;
1133
1134 writel(SLV_ADDR_SPACE_SZ,
1135 pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
1136
1137 val = readl(pcie->parf + PARF_PHY_CTRL);
1138 val &= ~PHY_TEST_PWR_DOWN;
1139 writel(val, pcie->parf + PARF_PHY_CTRL);
1140
1141 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
1142
1143 writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
1144 writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN,
1145 pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
1146 writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS |
1147 GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL,
1148 pci->dbi_base + GEN3_RELATED_OFF);
1149
1150 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS |
1151 SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
1152 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
1153 pcie->parf + PARF_SYS_CTRL);
1154
1155 writel(0, pcie->parf + PARF_Q2A_FLUSH);
1156
1157 dw_pcie_dbi_ro_wr_en(pci);
1158
1159 writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
1160
1161 val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
1162 val &= ~PCI_EXP_LNKCAP_ASPMS;
1163 writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP);
1164
1165 writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset +
1166 PCI_EXP_DEVCTL2);
1167
1168 dw_pcie_dbi_ro_wr_dis(pci);
1169
1170 for (i = 0; i < 256; i++)
1171 writel(0, pcie->parf + PARF_BDF_TO_SID_TABLE_N + (4 * i));
1172
1173 return 0;
1174}
1175
1176static int qcom_pcie_link_up(struct dw_pcie *pci)
1177{
1178 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1179 u16 val = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
1180
1181 return !!(val & PCI_EXP_LNKSTA_DLLLA);
1182}
1183
1184static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
1185{
1186 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1187 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1188 int ret;
1189
1190 qcom_ep_reset_assert(pcie);
1191
1192 ret = pcie->cfg->ops->init(pcie);
1193 if (ret)
1194 return ret;
1195
1196 ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
1197 if (ret)
1198 goto err_deinit;
1199
1200 ret = phy_power_on(pcie->phy);
1201 if (ret)
1202 goto err_deinit;
1203
1204 if (pcie->cfg->ops->post_init) {
1205 ret = pcie->cfg->ops->post_init(pcie);
1206 if (ret)
1207 goto err_disable_phy;
1208 }
1209
1210 qcom_ep_reset_deassert(pcie);
1211
1212 if (pcie->cfg->ops->config_sid) {
1213 ret = pcie->cfg->ops->config_sid(pcie);
1214 if (ret)
1215 goto err_assert_reset;
1216 }
1217
1218 return 0;
1219
1220err_assert_reset:
1221 qcom_ep_reset_assert(pcie);
1222err_disable_phy:
1223 phy_power_off(pcie->phy);
1224err_deinit:
1225 pcie->cfg->ops->deinit(pcie);
1226
1227 return ret;
1228}
1229
1230static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp)
1231{
1232 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1233 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1234
1235 qcom_ep_reset_assert(pcie);
1236 phy_power_off(pcie->phy);
1237 pcie->cfg->ops->deinit(pcie);
1238}
1239
1240static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp)
1241{
1242 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1243 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1244
1245 if (pcie->cfg->ops->host_post_init)
1246 pcie->cfg->ops->host_post_init(pcie);
1247}
1248
1249static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
1250 .init = qcom_pcie_host_init,
1251 .deinit = qcom_pcie_host_deinit,
1252 .post_init = qcom_pcie_host_post_init,
1253};
1254
1255/* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */
1256static const struct qcom_pcie_ops ops_2_1_0 = {
1257 .get_resources = qcom_pcie_get_resources_2_1_0,
1258 .init = qcom_pcie_init_2_1_0,
1259 .post_init = qcom_pcie_post_init_2_1_0,
1260 .deinit = qcom_pcie_deinit_2_1_0,
1261 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1262};
1263
1264/* Qcom IP rev.: 1.0.0 Synopsys IP rev.: 4.11a */
1265static const struct qcom_pcie_ops ops_1_0_0 = {
1266 .get_resources = qcom_pcie_get_resources_1_0_0,
1267 .init = qcom_pcie_init_1_0_0,
1268 .post_init = qcom_pcie_post_init_1_0_0,
1269 .deinit = qcom_pcie_deinit_1_0_0,
1270 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1271};
1272
1273/* Qcom IP rev.: 2.3.2 Synopsys IP rev.: 4.21a */
1274static const struct qcom_pcie_ops ops_2_3_2 = {
1275 .get_resources = qcom_pcie_get_resources_2_3_2,
1276 .init = qcom_pcie_init_2_3_2,
1277 .post_init = qcom_pcie_post_init_2_3_2,
1278 .deinit = qcom_pcie_deinit_2_3_2,
1279 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1280};
1281
1282/* Qcom IP rev.: 2.4.0 Synopsys IP rev.: 4.20a */
1283static const struct qcom_pcie_ops ops_2_4_0 = {
1284 .get_resources = qcom_pcie_get_resources_2_4_0,
1285 .init = qcom_pcie_init_2_4_0,
1286 .post_init = qcom_pcie_post_init_2_3_2,
1287 .deinit = qcom_pcie_deinit_2_4_0,
1288 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1289};
1290
1291/* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */
1292static const struct qcom_pcie_ops ops_2_3_3 = {
1293 .get_resources = qcom_pcie_get_resources_2_3_3,
1294 .init = qcom_pcie_init_2_3_3,
1295 .post_init = qcom_pcie_post_init_2_3_3,
1296 .deinit = qcom_pcie_deinit_2_3_3,
1297 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1298};
1299
1300/* Qcom IP rev.: 2.7.0 Synopsys IP rev.: 4.30a */
1301static const struct qcom_pcie_ops ops_2_7_0 = {
1302 .get_resources = qcom_pcie_get_resources_2_7_0,
1303 .init = qcom_pcie_init_2_7_0,
1304 .post_init = qcom_pcie_post_init_2_7_0,
1305 .deinit = qcom_pcie_deinit_2_7_0,
1306 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1307};
1308
1309/* Qcom IP rev.: 1.9.0 */
1310static const struct qcom_pcie_ops ops_1_9_0 = {
1311 .get_resources = qcom_pcie_get_resources_2_7_0,
1312 .init = qcom_pcie_init_2_7_0,
1313 .post_init = qcom_pcie_post_init_2_7_0,
1314 .host_post_init = qcom_pcie_host_post_init_2_7_0,
1315 .deinit = qcom_pcie_deinit_2_7_0,
1316 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1317 .config_sid = qcom_pcie_config_sid_1_9_0,
1318};
1319
1320/* Qcom IP rev.: 2.9.0 Synopsys IP rev.: 5.00a */
1321static const struct qcom_pcie_ops ops_2_9_0 = {
1322 .get_resources = qcom_pcie_get_resources_2_9_0,
1323 .init = qcom_pcie_init_2_9_0,
1324 .post_init = qcom_pcie_post_init_2_9_0,
1325 .deinit = qcom_pcie_deinit_2_9_0,
1326 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1327};
1328
1329static const struct qcom_pcie_cfg cfg_1_0_0 = {
1330 .ops = &ops_1_0_0,
1331};
1332
1333static const struct qcom_pcie_cfg cfg_1_9_0 = {
1334 .ops = &ops_1_9_0,
1335};
1336
1337static const struct qcom_pcie_cfg cfg_2_1_0 = {
1338 .ops = &ops_2_1_0,
1339};
1340
1341static const struct qcom_pcie_cfg cfg_2_3_2 = {
1342 .ops = &ops_2_3_2,
1343};
1344
1345static const struct qcom_pcie_cfg cfg_2_3_3 = {
1346 .ops = &ops_2_3_3,
1347};
1348
1349static const struct qcom_pcie_cfg cfg_2_4_0 = {
1350 .ops = &ops_2_4_0,
1351};
1352
1353static const struct qcom_pcie_cfg cfg_2_7_0 = {
1354 .ops = &ops_2_7_0,
1355};
1356
1357static const struct qcom_pcie_cfg cfg_2_9_0 = {
1358 .ops = &ops_2_9_0,
1359};
1360
1361static const struct dw_pcie_ops dw_pcie_ops = {
1362 .link_up = qcom_pcie_link_up,
1363 .start_link = qcom_pcie_start_link,
1364};
1365
1366static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
1367{
1368 struct dw_pcie *pci = pcie->pci;
1369 int ret;
1370
1371 pcie->icc_mem = devm_of_icc_get(pci->dev, "pcie-mem");
1372 if (IS_ERR(pcie->icc_mem))
1373 return PTR_ERR(pcie->icc_mem);
1374
1375 /*
1376 * Some Qualcomm platforms require interconnect bandwidth constraints
1377 * to be set before enabling interconnect clocks.
1378 *
1379 * Set an initial peak bandwidth corresponding to single-lane Gen 1
1380 * for the pcie-mem path.
1381 */
1382 ret = icc_set_bw(pcie->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
1383 if (ret) {
1384 dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
1385 ret);
1386 return ret;
1387 }
1388
1389 return 0;
1390}
1391
1392static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
1393{
1394 struct dw_pcie *pci = pcie->pci;
1395 u32 offset, status;
1396 int speed, width;
1397 int ret;
1398
1399 if (!pcie->icc_mem)
1400 return;
1401
1402 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1403 status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
1404
1405 /* Only update constraints if link is up. */
1406 if (!(status & PCI_EXP_LNKSTA_DLLLA))
1407 return;
1408
1409 speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
1410 width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
1411
1412 ret = icc_set_bw(pcie->icc_mem, 0, width * QCOM_PCIE_LINK_SPEED_TO_BW(speed));
1413 if (ret) {
1414 dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
1415 ret);
1416 }
1417}
1418
1419static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
1420{
1421 struct qcom_pcie *pcie = (struct qcom_pcie *)dev_get_drvdata(s->private);
1422
1423 seq_printf(s, "L0s transition count: %u\n",
1424 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
1425
1426 seq_printf(s, "L1 transition count: %u\n",
1427 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
1428
1429 seq_printf(s, "L1.1 transition count: %u\n",
1430 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
1431
1432 seq_printf(s, "L1.2 transition count: %u\n",
1433 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
1434
1435 seq_printf(s, "L2 transition count: %u\n",
1436 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
1437
1438 return 0;
1439}
1440
1441static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie)
1442{
1443 struct dw_pcie *pci = pcie->pci;
1444 struct device *dev = pci->dev;
1445 char *name;
1446
1447 name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
1448 if (!name)
1449 return;
1450
1451 pcie->debugfs = debugfs_create_dir(name, NULL);
1452 debugfs_create_devm_seqfile(dev, "link_transition_count", pcie->debugfs,
1453 qcom_pcie_link_transition_count);
1454}
1455
1456static int qcom_pcie_probe(struct platform_device *pdev)
1457{
1458 const struct qcom_pcie_cfg *pcie_cfg;
1459 struct device *dev = &pdev->dev;
1460 struct qcom_pcie *pcie;
1461 struct dw_pcie_rp *pp;
1462 struct resource *res;
1463 struct dw_pcie *pci;
1464 int ret;
1465
1466 pcie_cfg = of_device_get_match_data(dev);
1467 if (!pcie_cfg || !pcie_cfg->ops) {
1468 dev_err(dev, "Invalid platform data\n");
1469 return -EINVAL;
1470 }
1471
1472 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1473 if (!pcie)
1474 return -ENOMEM;
1475
1476 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1477 if (!pci)
1478 return -ENOMEM;
1479
1480 pm_runtime_enable(dev);
1481 ret = pm_runtime_get_sync(dev);
1482 if (ret < 0)
1483 goto err_pm_runtime_put;
1484
1485 pci->dev = dev;
1486 pci->ops = &dw_pcie_ops;
1487 pp = &pci->pp;
1488
1489 pcie->pci = pci;
1490
1491 pcie->cfg = pcie_cfg;
1492
1493 pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
1494 if (IS_ERR(pcie->reset)) {
1495 ret = PTR_ERR(pcie->reset);
1496 goto err_pm_runtime_put;
1497 }
1498
1499 pcie->parf = devm_platform_ioremap_resource_byname(pdev, "parf");
1500 if (IS_ERR(pcie->parf)) {
1501 ret = PTR_ERR(pcie->parf);
1502 goto err_pm_runtime_put;
1503 }
1504
1505 pcie->elbi = devm_platform_ioremap_resource_byname(pdev, "elbi");
1506 if (IS_ERR(pcie->elbi)) {
1507 ret = PTR_ERR(pcie->elbi);
1508 goto err_pm_runtime_put;
1509 }
1510
1511 /* MHI region is optional */
1512 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mhi");
1513 if (res) {
1514 pcie->mhi = devm_ioremap_resource(dev, res);
1515 if (IS_ERR(pcie->mhi)) {
1516 ret = PTR_ERR(pcie->mhi);
1517 goto err_pm_runtime_put;
1518 }
1519 }
1520
1521 pcie->phy = devm_phy_optional_get(dev, "pciephy");
1522 if (IS_ERR(pcie->phy)) {
1523 ret = PTR_ERR(pcie->phy);
1524 goto err_pm_runtime_put;
1525 }
1526
1527 ret = qcom_pcie_icc_init(pcie);
1528 if (ret)
1529 goto err_pm_runtime_put;
1530
1531 ret = pcie->cfg->ops->get_resources(pcie);
1532 if (ret)
1533 goto err_pm_runtime_put;
1534
1535 pp->ops = &qcom_pcie_dw_ops;
1536
1537 ret = phy_init(pcie->phy);
1538 if (ret)
1539 goto err_pm_runtime_put;
1540
1541 platform_set_drvdata(pdev, pcie);
1542
1543 ret = dw_pcie_host_init(pp);
1544 if (ret) {
1545 dev_err(dev, "cannot initialize host\n");
1546 goto err_phy_exit;
1547 }
1548
1549 qcom_pcie_icc_update(pcie);
1550
1551 if (pcie->mhi)
1552 qcom_pcie_init_debugfs(pcie);
1553
1554 return 0;
1555
1556err_phy_exit:
1557 phy_exit(pcie->phy);
1558err_pm_runtime_put:
1559 pm_runtime_put(dev);
1560 pm_runtime_disable(dev);
1561
1562 return ret;
1563}
1564
1565static int qcom_pcie_suspend_noirq(struct device *dev)
1566{
1567 struct qcom_pcie *pcie = dev_get_drvdata(dev);
1568 int ret;
1569
1570 /*
1571 * Set minimum bandwidth required to keep data path functional during
1572 * suspend.
1573 */
1574 ret = icc_set_bw(pcie->icc_mem, 0, kBps_to_icc(1));
1575 if (ret) {
1576 dev_err(dev, "Failed to set interconnect bandwidth: %d\n", ret);
1577 return ret;
1578 }
1579
1580 /*
1581 * Turn OFF the resources only for controllers without active PCIe
1582 * devices. For controllers with active devices, the resources are kept
1583 * ON and the link is expected to be in L0/L1 (sub)states.
1584 *
1585 * Turning OFF the resources for controllers with active PCIe devices
1586 * will trigger access violation during the end of the suspend cycle,
1587 * as kernel tries to access the PCIe devices config space for masking
1588 * MSIs.
1589 *
1590 * Also, it is not desirable to put the link into L2/L3 state as that
1591 * implies VDD supply will be removed and the devices may go into
1592 * powerdown state. This will affect the lifetime of the storage devices
1593 * like NVMe.
1594 */
1595 if (!dw_pcie_link_up(pcie->pci)) {
1596 qcom_pcie_host_deinit(&pcie->pci->pp);
1597 pcie->suspended = true;
1598 }
1599
1600 return 0;
1601}
1602
1603static int qcom_pcie_resume_noirq(struct device *dev)
1604{
1605 struct qcom_pcie *pcie = dev_get_drvdata(dev);
1606 int ret;
1607
1608 if (pcie->suspended) {
1609 ret = qcom_pcie_host_init(&pcie->pci->pp);
1610 if (ret)
1611 return ret;
1612
1613 pcie->suspended = false;
1614 }
1615
1616 qcom_pcie_icc_update(pcie);
1617
1618 return 0;
1619}
1620
1621static const struct of_device_id qcom_pcie_match[] = {
1622 { .compatible = "qcom,pcie-apq8064", .data = &cfg_2_1_0 },
1623 { .compatible = "qcom,pcie-apq8084", .data = &cfg_1_0_0 },
1624 { .compatible = "qcom,pcie-ipq4019", .data = &cfg_2_4_0 },
1625 { .compatible = "qcom,pcie-ipq6018", .data = &cfg_2_9_0 },
1626 { .compatible = "qcom,pcie-ipq8064", .data = &cfg_2_1_0 },
1627 { .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
1628 { .compatible = "qcom,pcie-ipq8074", .data = &cfg_2_3_3 },
1629 { .compatible = "qcom,pcie-ipq8074-gen3", .data = &cfg_2_9_0 },
1630 { .compatible = "qcom,pcie-msm8996", .data = &cfg_2_3_2 },
1631 { .compatible = "qcom,pcie-qcs404", .data = &cfg_2_4_0 },
1632 { .compatible = "qcom,pcie-sa8540p", .data = &cfg_1_9_0 },
1633 { .compatible = "qcom,pcie-sa8775p", .data = &cfg_1_9_0},
1634 { .compatible = "qcom,pcie-sc7280", .data = &cfg_1_9_0 },
1635 { .compatible = "qcom,pcie-sc8180x", .data = &cfg_1_9_0 },
1636 { .compatible = "qcom,pcie-sc8280xp", .data = &cfg_1_9_0 },
1637 { .compatible = "qcom,pcie-sdm845", .data = &cfg_2_7_0 },
1638 { .compatible = "qcom,pcie-sdx55", .data = &cfg_1_9_0 },
1639 { .compatible = "qcom,pcie-sm8150", .data = &cfg_1_9_0 },
1640 { .compatible = "qcom,pcie-sm8250", .data = &cfg_1_9_0 },
1641 { .compatible = "qcom,pcie-sm8350", .data = &cfg_1_9_0 },
1642 { .compatible = "qcom,pcie-sm8450-pcie0", .data = &cfg_1_9_0 },
1643 { .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
1644 { .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
1645 { }
1646};
1647
1648static void qcom_fixup_class(struct pci_dev *dev)
1649{
1650 dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
1651}
1652DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
1653DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
1654DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0106, qcom_fixup_class);
1655DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0107, qcom_fixup_class);
1656DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0302, qcom_fixup_class);
1657DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1000, qcom_fixup_class);
1658DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1001, qcom_fixup_class);
1659
1660static const struct dev_pm_ops qcom_pcie_pm_ops = {
1661 NOIRQ_SYSTEM_SLEEP_PM_OPS(qcom_pcie_suspend_noirq, qcom_pcie_resume_noirq)
1662};
1663
1664static struct platform_driver qcom_pcie_driver = {
1665 .probe = qcom_pcie_probe,
1666 .driver = {
1667 .name = "qcom-pcie",
1668 .suppress_bind_attrs = true,
1669 .of_match_table = qcom_pcie_match,
1670 .pm = &qcom_pcie_pm_ops,
1671 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1672 },
1673};
1674builtin_platform_driver(qcom_pcie_driver);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Qualcomm PCIe root complex driver
4 *
5 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
6 * Copyright 2015 Linaro Limited.
7 *
8 * Author: Stanimir Varbanov <svarbanov@mm-sol.com>
9 */
10
11#include <linux/clk.h>
12#include <linux/delay.h>
13#include <linux/gpio/consumer.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/iopoll.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/of_device.h>
20#include <linux/of_gpio.h>
21#include <linux/pci.h>
22#include <linux/pm_runtime.h>
23#include <linux/platform_device.h>
24#include <linux/phy/phy.h>
25#include <linux/regulator/consumer.h>
26#include <linux/reset.h>
27#include <linux/slab.h>
28#include <linux/types.h>
29
30#include "pcie-designware.h"
31
32#define PCIE20_PARF_SYS_CTRL 0x00
33#define MST_WAKEUP_EN BIT(13)
34#define SLV_WAKEUP_EN BIT(12)
35#define MSTR_ACLK_CGC_DIS BIT(10)
36#define SLV_ACLK_CGC_DIS BIT(9)
37#define CORE_CLK_CGC_DIS BIT(6)
38#define AUX_PWR_DET BIT(4)
39#define L23_CLK_RMV_DIS BIT(2)
40#define L1_CLK_RMV_DIS BIT(1)
41
42#define PCIE20_COMMAND_STATUS 0x04
43#define CMD_BME_VAL 0x4
44#define PCIE20_DEVICE_CONTROL2_STATUS2 0x98
45#define PCIE_CAP_CPL_TIMEOUT_DISABLE 0x10
46
47#define PCIE20_PARF_PHY_CTRL 0x40
48#define PCIE20_PARF_PHY_REFCLK 0x4C
49#define PCIE20_PARF_DBI_BASE_ADDR 0x168
50#define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C
51#define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174
52#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178
53#define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8
54#define PCIE20_PARF_LTSSM 0x1B0
55#define PCIE20_PARF_SID_OFFSET 0x234
56#define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C
57
58#define PCIE20_ELBI_SYS_CTRL 0x04
59#define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0)
60
61#define PCIE20_AXI_MSTR_RESP_COMP_CTRL0 0x818
62#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K 0x4
63#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K 0x5
64#define PCIE20_AXI_MSTR_RESP_COMP_CTRL1 0x81c
65#define CFG_BRIDGE_SB_INIT BIT(0)
66
67#define PCIE20_CAP 0x70
68#define PCIE20_CAP_LINK_CAPABILITIES (PCIE20_CAP + 0xC)
69#define PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT (BIT(10) | BIT(11))
70#define PCIE20_CAP_LINK_1 (PCIE20_CAP + 0x14)
71#define PCIE_CAP_LINK1_VAL 0x2FD7F
72
73#define PCIE20_PARF_Q2A_FLUSH 0x1AC
74
75#define PCIE20_MISC_CONTROL_1_REG 0x8BC
76#define DBI_RO_WR_EN 1
77
78#define PERST_DELAY_US 1000
79
80#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
81#define SLV_ADDR_SPACE_SZ 0x10000000
82
83#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
84struct qcom_pcie_resources_2_1_0 {
85 struct clk *iface_clk;
86 struct clk *core_clk;
87 struct clk *phy_clk;
88 struct reset_control *pci_reset;
89 struct reset_control *axi_reset;
90 struct reset_control *ahb_reset;
91 struct reset_control *por_reset;
92 struct reset_control *phy_reset;
93 struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
94};
95
96struct qcom_pcie_resources_1_0_0 {
97 struct clk *iface;
98 struct clk *aux;
99 struct clk *master_bus;
100 struct clk *slave_bus;
101 struct reset_control *core;
102 struct regulator *vdda;
103};
104
105#define QCOM_PCIE_2_3_2_MAX_SUPPLY 2
106struct qcom_pcie_resources_2_3_2 {
107 struct clk *aux_clk;
108 struct clk *master_clk;
109 struct clk *slave_clk;
110 struct clk *cfg_clk;
111 struct clk *pipe_clk;
112 struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
113};
114
115#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4
116struct qcom_pcie_resources_2_4_0 {
117 struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
118 int num_clks;
119 struct reset_control *axi_m_reset;
120 struct reset_control *axi_s_reset;
121 struct reset_control *pipe_reset;
122 struct reset_control *axi_m_vmid_reset;
123 struct reset_control *axi_s_xpu_reset;
124 struct reset_control *parf_reset;
125 struct reset_control *phy_reset;
126 struct reset_control *axi_m_sticky_reset;
127 struct reset_control *pipe_sticky_reset;
128 struct reset_control *pwr_reset;
129 struct reset_control *ahb_reset;
130 struct reset_control *phy_ahb_reset;
131};
132
133struct qcom_pcie_resources_2_3_3 {
134 struct clk *iface;
135 struct clk *axi_m_clk;
136 struct clk *axi_s_clk;
137 struct clk *ahb_clk;
138 struct clk *aux_clk;
139 struct reset_control *rst[7];
140};
141
142union qcom_pcie_resources {
143 struct qcom_pcie_resources_1_0_0 v1_0_0;
144 struct qcom_pcie_resources_2_1_0 v2_1_0;
145 struct qcom_pcie_resources_2_3_2 v2_3_2;
146 struct qcom_pcie_resources_2_3_3 v2_3_3;
147 struct qcom_pcie_resources_2_4_0 v2_4_0;
148};
149
150struct qcom_pcie;
151
152struct qcom_pcie_ops {
153 int (*get_resources)(struct qcom_pcie *pcie);
154 int (*init)(struct qcom_pcie *pcie);
155 int (*post_init)(struct qcom_pcie *pcie);
156 void (*deinit)(struct qcom_pcie *pcie);
157 void (*post_deinit)(struct qcom_pcie *pcie);
158 void (*ltssm_enable)(struct qcom_pcie *pcie);
159};
160
161struct qcom_pcie {
162 struct dw_pcie *pci;
163 void __iomem *parf; /* DT parf */
164 void __iomem *elbi; /* DT elbi */
165 union qcom_pcie_resources res;
166 struct phy *phy;
167 struct gpio_desc *reset;
168 const struct qcom_pcie_ops *ops;
169};
170
171#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
172
173static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
174{
175 gpiod_set_value_cansleep(pcie->reset, 1);
176 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
177}
178
179static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
180{
181 /* Ensure that PERST has been asserted for at least 100 ms */
182 msleep(100);
183 gpiod_set_value_cansleep(pcie->reset, 0);
184 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
185}
186
187static int qcom_pcie_establish_link(struct qcom_pcie *pcie)
188{
189 struct dw_pcie *pci = pcie->pci;
190
191 if (dw_pcie_link_up(pci))
192 return 0;
193
194 /* Enable Link Training state machine */
195 if (pcie->ops->ltssm_enable)
196 pcie->ops->ltssm_enable(pcie);
197
198 return dw_pcie_wait_for_link(pci);
199}
200
201static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
202{
203 u32 val;
204
205 /* enable link training */
206 val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL);
207 val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE;
208 writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL);
209}
210
211static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
212{
213 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
214 struct dw_pcie *pci = pcie->pci;
215 struct device *dev = pci->dev;
216 int ret;
217
218 res->supplies[0].supply = "vdda";
219 res->supplies[1].supply = "vdda_phy";
220 res->supplies[2].supply = "vdda_refclk";
221 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
222 res->supplies);
223 if (ret)
224 return ret;
225
226 res->iface_clk = devm_clk_get(dev, "iface");
227 if (IS_ERR(res->iface_clk))
228 return PTR_ERR(res->iface_clk);
229
230 res->core_clk = devm_clk_get(dev, "core");
231 if (IS_ERR(res->core_clk))
232 return PTR_ERR(res->core_clk);
233
234 res->phy_clk = devm_clk_get(dev, "phy");
235 if (IS_ERR(res->phy_clk))
236 return PTR_ERR(res->phy_clk);
237
238 res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
239 if (IS_ERR(res->pci_reset))
240 return PTR_ERR(res->pci_reset);
241
242 res->axi_reset = devm_reset_control_get_exclusive(dev, "axi");
243 if (IS_ERR(res->axi_reset))
244 return PTR_ERR(res->axi_reset);
245
246 res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
247 if (IS_ERR(res->ahb_reset))
248 return PTR_ERR(res->ahb_reset);
249
250 res->por_reset = devm_reset_control_get_exclusive(dev, "por");
251 if (IS_ERR(res->por_reset))
252 return PTR_ERR(res->por_reset);
253
254 res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
255 return PTR_ERR_OR_ZERO(res->phy_reset);
256}
257
258static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
259{
260 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
261
262 reset_control_assert(res->pci_reset);
263 reset_control_assert(res->axi_reset);
264 reset_control_assert(res->ahb_reset);
265 reset_control_assert(res->por_reset);
266 reset_control_assert(res->pci_reset);
267 clk_disable_unprepare(res->iface_clk);
268 clk_disable_unprepare(res->core_clk);
269 clk_disable_unprepare(res->phy_clk);
270 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
271}
272
273static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
274{
275 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
276 struct dw_pcie *pci = pcie->pci;
277 struct device *dev = pci->dev;
278 u32 val;
279 int ret;
280
281 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
282 if (ret < 0) {
283 dev_err(dev, "cannot enable regulators\n");
284 return ret;
285 }
286
287 ret = reset_control_assert(res->ahb_reset);
288 if (ret) {
289 dev_err(dev, "cannot assert ahb reset\n");
290 goto err_assert_ahb;
291 }
292
293 ret = clk_prepare_enable(res->iface_clk);
294 if (ret) {
295 dev_err(dev, "cannot prepare/enable iface clock\n");
296 goto err_assert_ahb;
297 }
298
299 ret = clk_prepare_enable(res->phy_clk);
300 if (ret) {
301 dev_err(dev, "cannot prepare/enable phy clock\n");
302 goto err_clk_phy;
303 }
304
305 ret = clk_prepare_enable(res->core_clk);
306 if (ret) {
307 dev_err(dev, "cannot prepare/enable core clock\n");
308 goto err_clk_core;
309 }
310
311 ret = reset_control_deassert(res->ahb_reset);
312 if (ret) {
313 dev_err(dev, "cannot deassert ahb reset\n");
314 goto err_deassert_ahb;
315 }
316
317 /* enable PCIe clocks and resets */
318 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
319 val &= ~BIT(0);
320 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
321
322 /* enable external reference clock */
323 val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
324 val |= BIT(16);
325 writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
326
327 ret = reset_control_deassert(res->phy_reset);
328 if (ret) {
329 dev_err(dev, "cannot deassert phy reset\n");
330 return ret;
331 }
332
333 ret = reset_control_deassert(res->pci_reset);
334 if (ret) {
335 dev_err(dev, "cannot deassert pci reset\n");
336 return ret;
337 }
338
339 ret = reset_control_deassert(res->por_reset);
340 if (ret) {
341 dev_err(dev, "cannot deassert por reset\n");
342 return ret;
343 }
344
345 ret = reset_control_deassert(res->axi_reset);
346 if (ret) {
347 dev_err(dev, "cannot deassert axi reset\n");
348 return ret;
349 }
350
351 /* wait for clock acquisition */
352 usleep_range(1000, 1500);
353
354
355 /* Set the Max TLP size to 2K, instead of using default of 4K */
356 writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
357 pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL0);
358 writel(CFG_BRIDGE_SB_INIT,
359 pci->dbi_base + PCIE20_AXI_MSTR_RESP_COMP_CTRL1);
360
361 return 0;
362
363err_deassert_ahb:
364 clk_disable_unprepare(res->core_clk);
365err_clk_core:
366 clk_disable_unprepare(res->phy_clk);
367err_clk_phy:
368 clk_disable_unprepare(res->iface_clk);
369err_assert_ahb:
370 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
371
372 return ret;
373}
374
375static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie)
376{
377 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
378 struct dw_pcie *pci = pcie->pci;
379 struct device *dev = pci->dev;
380
381 res->vdda = devm_regulator_get(dev, "vdda");
382 if (IS_ERR(res->vdda))
383 return PTR_ERR(res->vdda);
384
385 res->iface = devm_clk_get(dev, "iface");
386 if (IS_ERR(res->iface))
387 return PTR_ERR(res->iface);
388
389 res->aux = devm_clk_get(dev, "aux");
390 if (IS_ERR(res->aux))
391 return PTR_ERR(res->aux);
392
393 res->master_bus = devm_clk_get(dev, "master_bus");
394 if (IS_ERR(res->master_bus))
395 return PTR_ERR(res->master_bus);
396
397 res->slave_bus = devm_clk_get(dev, "slave_bus");
398 if (IS_ERR(res->slave_bus))
399 return PTR_ERR(res->slave_bus);
400
401 res->core = devm_reset_control_get_exclusive(dev, "core");
402 return PTR_ERR_OR_ZERO(res->core);
403}
404
405static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie)
406{
407 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
408
409 reset_control_assert(res->core);
410 clk_disable_unprepare(res->slave_bus);
411 clk_disable_unprepare(res->master_bus);
412 clk_disable_unprepare(res->iface);
413 clk_disable_unprepare(res->aux);
414 regulator_disable(res->vdda);
415}
416
417static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
418{
419 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
420 struct dw_pcie *pci = pcie->pci;
421 struct device *dev = pci->dev;
422 int ret;
423
424 ret = reset_control_deassert(res->core);
425 if (ret) {
426 dev_err(dev, "cannot deassert core reset\n");
427 return ret;
428 }
429
430 ret = clk_prepare_enable(res->aux);
431 if (ret) {
432 dev_err(dev, "cannot prepare/enable aux clock\n");
433 goto err_res;
434 }
435
436 ret = clk_prepare_enable(res->iface);
437 if (ret) {
438 dev_err(dev, "cannot prepare/enable iface clock\n");
439 goto err_aux;
440 }
441
442 ret = clk_prepare_enable(res->master_bus);
443 if (ret) {
444 dev_err(dev, "cannot prepare/enable master_bus clock\n");
445 goto err_iface;
446 }
447
448 ret = clk_prepare_enable(res->slave_bus);
449 if (ret) {
450 dev_err(dev, "cannot prepare/enable slave_bus clock\n");
451 goto err_master;
452 }
453
454 ret = regulator_enable(res->vdda);
455 if (ret) {
456 dev_err(dev, "cannot enable vdda regulator\n");
457 goto err_slave;
458 }
459
460 /* change DBI base address */
461 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
462
463 if (IS_ENABLED(CONFIG_PCI_MSI)) {
464 u32 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
465
466 val |= BIT(31);
467 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
468 }
469
470 return 0;
471err_slave:
472 clk_disable_unprepare(res->slave_bus);
473err_master:
474 clk_disable_unprepare(res->master_bus);
475err_iface:
476 clk_disable_unprepare(res->iface);
477err_aux:
478 clk_disable_unprepare(res->aux);
479err_res:
480 reset_control_assert(res->core);
481
482 return ret;
483}
484
485static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
486{
487 u32 val;
488
489 /* enable link training */
490 val = readl(pcie->parf + PCIE20_PARF_LTSSM);
491 val |= BIT(8);
492 writel(val, pcie->parf + PCIE20_PARF_LTSSM);
493}
494
495static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
496{
497 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
498 struct dw_pcie *pci = pcie->pci;
499 struct device *dev = pci->dev;
500 int ret;
501
502 res->supplies[0].supply = "vdda";
503 res->supplies[1].supply = "vddpe-3v3";
504 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
505 res->supplies);
506 if (ret)
507 return ret;
508
509 res->aux_clk = devm_clk_get(dev, "aux");
510 if (IS_ERR(res->aux_clk))
511 return PTR_ERR(res->aux_clk);
512
513 res->cfg_clk = devm_clk_get(dev, "cfg");
514 if (IS_ERR(res->cfg_clk))
515 return PTR_ERR(res->cfg_clk);
516
517 res->master_clk = devm_clk_get(dev, "bus_master");
518 if (IS_ERR(res->master_clk))
519 return PTR_ERR(res->master_clk);
520
521 res->slave_clk = devm_clk_get(dev, "bus_slave");
522 if (IS_ERR(res->slave_clk))
523 return PTR_ERR(res->slave_clk);
524
525 res->pipe_clk = devm_clk_get(dev, "pipe");
526 return PTR_ERR_OR_ZERO(res->pipe_clk);
527}
528
529static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
530{
531 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
532
533 clk_disable_unprepare(res->slave_clk);
534 clk_disable_unprepare(res->master_clk);
535 clk_disable_unprepare(res->cfg_clk);
536 clk_disable_unprepare(res->aux_clk);
537
538 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
539}
540
541static void qcom_pcie_post_deinit_2_3_2(struct qcom_pcie *pcie)
542{
543 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
544
545 clk_disable_unprepare(res->pipe_clk);
546}
547
548static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
549{
550 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
551 struct dw_pcie *pci = pcie->pci;
552 struct device *dev = pci->dev;
553 u32 val;
554 int ret;
555
556 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
557 if (ret < 0) {
558 dev_err(dev, "cannot enable regulators\n");
559 return ret;
560 }
561
562 ret = clk_prepare_enable(res->aux_clk);
563 if (ret) {
564 dev_err(dev, "cannot prepare/enable aux clock\n");
565 goto err_aux_clk;
566 }
567
568 ret = clk_prepare_enable(res->cfg_clk);
569 if (ret) {
570 dev_err(dev, "cannot prepare/enable cfg clock\n");
571 goto err_cfg_clk;
572 }
573
574 ret = clk_prepare_enable(res->master_clk);
575 if (ret) {
576 dev_err(dev, "cannot prepare/enable master clock\n");
577 goto err_master_clk;
578 }
579
580 ret = clk_prepare_enable(res->slave_clk);
581 if (ret) {
582 dev_err(dev, "cannot prepare/enable slave clock\n");
583 goto err_slave_clk;
584 }
585
586 /* enable PCIe clocks and resets */
587 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
588 val &= ~BIT(0);
589 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
590
591 /* change DBI base address */
592 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
593
594 /* MAC PHY_POWERDOWN MUX DISABLE */
595 val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
596 val &= ~BIT(29);
597 writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
598
599 val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
600 val |= BIT(4);
601 writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
602
603 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
604 val |= BIT(31);
605 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
606
607 return 0;
608
609err_slave_clk:
610 clk_disable_unprepare(res->master_clk);
611err_master_clk:
612 clk_disable_unprepare(res->cfg_clk);
613err_cfg_clk:
614 clk_disable_unprepare(res->aux_clk);
615
616err_aux_clk:
617 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
618
619 return ret;
620}
621
622static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
623{
624 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
625 struct dw_pcie *pci = pcie->pci;
626 struct device *dev = pci->dev;
627 int ret;
628
629 ret = clk_prepare_enable(res->pipe_clk);
630 if (ret) {
631 dev_err(dev, "cannot prepare/enable pipe clock\n");
632 return ret;
633 }
634
635 return 0;
636}
637
638static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
639{
640 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
641 struct dw_pcie *pci = pcie->pci;
642 struct device *dev = pci->dev;
643 bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019");
644 int ret;
645
646 res->clks[0].id = "aux";
647 res->clks[1].id = "master_bus";
648 res->clks[2].id = "slave_bus";
649 res->clks[3].id = "iface";
650
651 /* qcom,pcie-ipq4019 is defined without "iface" */
652 res->num_clks = is_ipq ? 3 : 4;
653
654 ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
655 if (ret < 0)
656 return ret;
657
658 res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
659 if (IS_ERR(res->axi_m_reset))
660 return PTR_ERR(res->axi_m_reset);
661
662 res->axi_s_reset = devm_reset_control_get_exclusive(dev, "axi_s");
663 if (IS_ERR(res->axi_s_reset))
664 return PTR_ERR(res->axi_s_reset);
665
666 if (is_ipq) {
667 /*
668 * These resources relates to the PHY or are secure clocks, but
669 * are controlled here for IPQ4019
670 */
671 res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe");
672 if (IS_ERR(res->pipe_reset))
673 return PTR_ERR(res->pipe_reset);
674
675 res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev,
676 "axi_m_vmid");
677 if (IS_ERR(res->axi_m_vmid_reset))
678 return PTR_ERR(res->axi_m_vmid_reset);
679
680 res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev,
681 "axi_s_xpu");
682 if (IS_ERR(res->axi_s_xpu_reset))
683 return PTR_ERR(res->axi_s_xpu_reset);
684
685 res->parf_reset = devm_reset_control_get_exclusive(dev, "parf");
686 if (IS_ERR(res->parf_reset))
687 return PTR_ERR(res->parf_reset);
688
689 res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
690 if (IS_ERR(res->phy_reset))
691 return PTR_ERR(res->phy_reset);
692 }
693
694 res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev,
695 "axi_m_sticky");
696 if (IS_ERR(res->axi_m_sticky_reset))
697 return PTR_ERR(res->axi_m_sticky_reset);
698
699 res->pipe_sticky_reset = devm_reset_control_get_exclusive(dev,
700 "pipe_sticky");
701 if (IS_ERR(res->pipe_sticky_reset))
702 return PTR_ERR(res->pipe_sticky_reset);
703
704 res->pwr_reset = devm_reset_control_get_exclusive(dev, "pwr");
705 if (IS_ERR(res->pwr_reset))
706 return PTR_ERR(res->pwr_reset);
707
708 res->ahb_reset = devm_reset_control_get_exclusive(dev, "ahb");
709 if (IS_ERR(res->ahb_reset))
710 return PTR_ERR(res->ahb_reset);
711
712 if (is_ipq) {
713 res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb");
714 if (IS_ERR(res->phy_ahb_reset))
715 return PTR_ERR(res->phy_ahb_reset);
716 }
717
718 return 0;
719}
720
721static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
722{
723 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
724
725 reset_control_assert(res->axi_m_reset);
726 reset_control_assert(res->axi_s_reset);
727 reset_control_assert(res->pipe_reset);
728 reset_control_assert(res->pipe_sticky_reset);
729 reset_control_assert(res->phy_reset);
730 reset_control_assert(res->phy_ahb_reset);
731 reset_control_assert(res->axi_m_sticky_reset);
732 reset_control_assert(res->pwr_reset);
733 reset_control_assert(res->ahb_reset);
734 clk_bulk_disable_unprepare(res->num_clks, res->clks);
735}
736
737static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
738{
739 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
740 struct dw_pcie *pci = pcie->pci;
741 struct device *dev = pci->dev;
742 u32 val;
743 int ret;
744
745 ret = reset_control_assert(res->axi_m_reset);
746 if (ret) {
747 dev_err(dev, "cannot assert axi master reset\n");
748 return ret;
749 }
750
751 ret = reset_control_assert(res->axi_s_reset);
752 if (ret) {
753 dev_err(dev, "cannot assert axi slave reset\n");
754 return ret;
755 }
756
757 usleep_range(10000, 12000);
758
759 ret = reset_control_assert(res->pipe_reset);
760 if (ret) {
761 dev_err(dev, "cannot assert pipe reset\n");
762 return ret;
763 }
764
765 ret = reset_control_assert(res->pipe_sticky_reset);
766 if (ret) {
767 dev_err(dev, "cannot assert pipe sticky reset\n");
768 return ret;
769 }
770
771 ret = reset_control_assert(res->phy_reset);
772 if (ret) {
773 dev_err(dev, "cannot assert phy reset\n");
774 return ret;
775 }
776
777 ret = reset_control_assert(res->phy_ahb_reset);
778 if (ret) {
779 dev_err(dev, "cannot assert phy ahb reset\n");
780 return ret;
781 }
782
783 usleep_range(10000, 12000);
784
785 ret = reset_control_assert(res->axi_m_sticky_reset);
786 if (ret) {
787 dev_err(dev, "cannot assert axi master sticky reset\n");
788 return ret;
789 }
790
791 ret = reset_control_assert(res->pwr_reset);
792 if (ret) {
793 dev_err(dev, "cannot assert power reset\n");
794 return ret;
795 }
796
797 ret = reset_control_assert(res->ahb_reset);
798 if (ret) {
799 dev_err(dev, "cannot assert ahb reset\n");
800 return ret;
801 }
802
803 usleep_range(10000, 12000);
804
805 ret = reset_control_deassert(res->phy_ahb_reset);
806 if (ret) {
807 dev_err(dev, "cannot deassert phy ahb reset\n");
808 return ret;
809 }
810
811 ret = reset_control_deassert(res->phy_reset);
812 if (ret) {
813 dev_err(dev, "cannot deassert phy reset\n");
814 goto err_rst_phy;
815 }
816
817 ret = reset_control_deassert(res->pipe_reset);
818 if (ret) {
819 dev_err(dev, "cannot deassert pipe reset\n");
820 goto err_rst_pipe;
821 }
822
823 ret = reset_control_deassert(res->pipe_sticky_reset);
824 if (ret) {
825 dev_err(dev, "cannot deassert pipe sticky reset\n");
826 goto err_rst_pipe_sticky;
827 }
828
829 usleep_range(10000, 12000);
830
831 ret = reset_control_deassert(res->axi_m_reset);
832 if (ret) {
833 dev_err(dev, "cannot deassert axi master reset\n");
834 goto err_rst_axi_m;
835 }
836
837 ret = reset_control_deassert(res->axi_m_sticky_reset);
838 if (ret) {
839 dev_err(dev, "cannot deassert axi master sticky reset\n");
840 goto err_rst_axi_m_sticky;
841 }
842
843 ret = reset_control_deassert(res->axi_s_reset);
844 if (ret) {
845 dev_err(dev, "cannot deassert axi slave reset\n");
846 goto err_rst_axi_s;
847 }
848
849 ret = reset_control_deassert(res->pwr_reset);
850 if (ret) {
851 dev_err(dev, "cannot deassert power reset\n");
852 goto err_rst_pwr;
853 }
854
855 ret = reset_control_deassert(res->ahb_reset);
856 if (ret) {
857 dev_err(dev, "cannot deassert ahb reset\n");
858 goto err_rst_ahb;
859 }
860
861 usleep_range(10000, 12000);
862
863 ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
864 if (ret)
865 goto err_clks;
866
867 /* enable PCIe clocks and resets */
868 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
869 val &= ~BIT(0);
870 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
871
872 /* change DBI base address */
873 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
874
875 /* MAC PHY_POWERDOWN MUX DISABLE */
876 val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL);
877 val &= ~BIT(29);
878 writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL);
879
880 val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
881 val |= BIT(4);
882 writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
883
884 val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
885 val |= BIT(31);
886 writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
887
888 return 0;
889
890err_clks:
891 reset_control_assert(res->ahb_reset);
892err_rst_ahb:
893 reset_control_assert(res->pwr_reset);
894err_rst_pwr:
895 reset_control_assert(res->axi_s_reset);
896err_rst_axi_s:
897 reset_control_assert(res->axi_m_sticky_reset);
898err_rst_axi_m_sticky:
899 reset_control_assert(res->axi_m_reset);
900err_rst_axi_m:
901 reset_control_assert(res->pipe_sticky_reset);
902err_rst_pipe_sticky:
903 reset_control_assert(res->pipe_reset);
904err_rst_pipe:
905 reset_control_assert(res->phy_reset);
906err_rst_phy:
907 reset_control_assert(res->phy_ahb_reset);
908 return ret;
909}
910
911static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
912{
913 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
914 struct dw_pcie *pci = pcie->pci;
915 struct device *dev = pci->dev;
916 int i;
917 const char *rst_names[] = { "axi_m", "axi_s", "pipe",
918 "axi_m_sticky", "sticky",
919 "ahb", "sleep", };
920
921 res->iface = devm_clk_get(dev, "iface");
922 if (IS_ERR(res->iface))
923 return PTR_ERR(res->iface);
924
925 res->axi_m_clk = devm_clk_get(dev, "axi_m");
926 if (IS_ERR(res->axi_m_clk))
927 return PTR_ERR(res->axi_m_clk);
928
929 res->axi_s_clk = devm_clk_get(dev, "axi_s");
930 if (IS_ERR(res->axi_s_clk))
931 return PTR_ERR(res->axi_s_clk);
932
933 res->ahb_clk = devm_clk_get(dev, "ahb");
934 if (IS_ERR(res->ahb_clk))
935 return PTR_ERR(res->ahb_clk);
936
937 res->aux_clk = devm_clk_get(dev, "aux");
938 if (IS_ERR(res->aux_clk))
939 return PTR_ERR(res->aux_clk);
940
941 for (i = 0; i < ARRAY_SIZE(rst_names); i++) {
942 res->rst[i] = devm_reset_control_get(dev, rst_names[i]);
943 if (IS_ERR(res->rst[i]))
944 return PTR_ERR(res->rst[i]);
945 }
946
947 return 0;
948}
949
950static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
951{
952 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
953
954 clk_disable_unprepare(res->iface);
955 clk_disable_unprepare(res->axi_m_clk);
956 clk_disable_unprepare(res->axi_s_clk);
957 clk_disable_unprepare(res->ahb_clk);
958 clk_disable_unprepare(res->aux_clk);
959}
960
961static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
962{
963 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
964 struct dw_pcie *pci = pcie->pci;
965 struct device *dev = pci->dev;
966 int i, ret;
967 u32 val;
968
969 for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
970 ret = reset_control_assert(res->rst[i]);
971 if (ret) {
972 dev_err(dev, "reset #%d assert failed (%d)\n", i, ret);
973 return ret;
974 }
975 }
976
977 usleep_range(2000, 2500);
978
979 for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
980 ret = reset_control_deassert(res->rst[i]);
981 if (ret) {
982 dev_err(dev, "reset #%d deassert failed (%d)\n", i,
983 ret);
984 return ret;
985 }
986 }
987
988 /*
989 * Don't have a way to see if the reset has completed.
990 * Wait for some time.
991 */
992 usleep_range(2000, 2500);
993
994 ret = clk_prepare_enable(res->iface);
995 if (ret) {
996 dev_err(dev, "cannot prepare/enable core clock\n");
997 goto err_clk_iface;
998 }
999
1000 ret = clk_prepare_enable(res->axi_m_clk);
1001 if (ret) {
1002 dev_err(dev, "cannot prepare/enable core clock\n");
1003 goto err_clk_axi_m;
1004 }
1005
1006 ret = clk_prepare_enable(res->axi_s_clk);
1007 if (ret) {
1008 dev_err(dev, "cannot prepare/enable axi slave clock\n");
1009 goto err_clk_axi_s;
1010 }
1011
1012 ret = clk_prepare_enable(res->ahb_clk);
1013 if (ret) {
1014 dev_err(dev, "cannot prepare/enable ahb clock\n");
1015 goto err_clk_ahb;
1016 }
1017
1018 ret = clk_prepare_enable(res->aux_clk);
1019 if (ret) {
1020 dev_err(dev, "cannot prepare/enable aux clock\n");
1021 goto err_clk_aux;
1022 }
1023
1024 writel(SLV_ADDR_SPACE_SZ,
1025 pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);
1026
1027 val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
1028 val &= ~BIT(0);
1029 writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
1030
1031 writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
1032
1033 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
1034 | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
1035 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
1036 pcie->parf + PCIE20_PARF_SYS_CTRL);
1037 writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH);
1038
1039 writel(CMD_BME_VAL, pci->dbi_base + PCIE20_COMMAND_STATUS);
1040 writel(DBI_RO_WR_EN, pci->dbi_base + PCIE20_MISC_CONTROL_1_REG);
1041 writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + PCIE20_CAP_LINK_1);
1042
1043 val = readl(pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
1044 val &= ~PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT;
1045 writel(val, pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
1046
1047 writel(PCIE_CAP_CPL_TIMEOUT_DISABLE, pci->dbi_base +
1048 PCIE20_DEVICE_CONTROL2_STATUS2);
1049
1050 return 0;
1051
1052err_clk_aux:
1053 clk_disable_unprepare(res->ahb_clk);
1054err_clk_ahb:
1055 clk_disable_unprepare(res->axi_s_clk);
1056err_clk_axi_s:
1057 clk_disable_unprepare(res->axi_m_clk);
1058err_clk_axi_m:
1059 clk_disable_unprepare(res->iface);
1060err_clk_iface:
1061 /*
1062 * Not checking for failure, will anyway return
1063 * the original failure in 'ret'.
1064 */
1065 for (i = 0; i < ARRAY_SIZE(res->rst); i++)
1066 reset_control_assert(res->rst[i]);
1067
1068 return ret;
1069}
1070
1071static int qcom_pcie_link_up(struct dw_pcie *pci)
1072{
1073 u16 val = readw(pci->dbi_base + PCIE20_CAP + PCI_EXP_LNKSTA);
1074
1075 return !!(val & PCI_EXP_LNKSTA_DLLLA);
1076}
1077
1078static int qcom_pcie_host_init(struct pcie_port *pp)
1079{
1080 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1081 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1082 int ret;
1083
1084 qcom_ep_reset_assert(pcie);
1085
1086 ret = pcie->ops->init(pcie);
1087 if (ret)
1088 return ret;
1089
1090 ret = phy_power_on(pcie->phy);
1091 if (ret)
1092 goto err_deinit;
1093
1094 if (pcie->ops->post_init) {
1095 ret = pcie->ops->post_init(pcie);
1096 if (ret)
1097 goto err_disable_phy;
1098 }
1099
1100 dw_pcie_setup_rc(pp);
1101
1102 if (IS_ENABLED(CONFIG_PCI_MSI))
1103 dw_pcie_msi_init(pp);
1104
1105 qcom_ep_reset_deassert(pcie);
1106
1107 ret = qcom_pcie_establish_link(pcie);
1108 if (ret)
1109 goto err;
1110
1111 return 0;
1112err:
1113 qcom_ep_reset_assert(pcie);
1114 if (pcie->ops->post_deinit)
1115 pcie->ops->post_deinit(pcie);
1116err_disable_phy:
1117 phy_power_off(pcie->phy);
1118err_deinit:
1119 pcie->ops->deinit(pcie);
1120
1121 return ret;
1122}
1123
1124static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
1125 .host_init = qcom_pcie_host_init,
1126};
1127
1128/* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */
1129static const struct qcom_pcie_ops ops_2_1_0 = {
1130 .get_resources = qcom_pcie_get_resources_2_1_0,
1131 .init = qcom_pcie_init_2_1_0,
1132 .deinit = qcom_pcie_deinit_2_1_0,
1133 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1134};
1135
1136/* Qcom IP rev.: 1.0.0 Synopsys IP rev.: 4.11a */
1137static const struct qcom_pcie_ops ops_1_0_0 = {
1138 .get_resources = qcom_pcie_get_resources_1_0_0,
1139 .init = qcom_pcie_init_1_0_0,
1140 .deinit = qcom_pcie_deinit_1_0_0,
1141 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1142};
1143
1144/* Qcom IP rev.: 2.3.2 Synopsys IP rev.: 4.21a */
1145static const struct qcom_pcie_ops ops_2_3_2 = {
1146 .get_resources = qcom_pcie_get_resources_2_3_2,
1147 .init = qcom_pcie_init_2_3_2,
1148 .post_init = qcom_pcie_post_init_2_3_2,
1149 .deinit = qcom_pcie_deinit_2_3_2,
1150 .post_deinit = qcom_pcie_post_deinit_2_3_2,
1151 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1152};
1153
1154/* Qcom IP rev.: 2.4.0 Synopsys IP rev.: 4.20a */
1155static const struct qcom_pcie_ops ops_2_4_0 = {
1156 .get_resources = qcom_pcie_get_resources_2_4_0,
1157 .init = qcom_pcie_init_2_4_0,
1158 .deinit = qcom_pcie_deinit_2_4_0,
1159 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1160};
1161
1162/* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */
1163static const struct qcom_pcie_ops ops_2_3_3 = {
1164 .get_resources = qcom_pcie_get_resources_2_3_3,
1165 .init = qcom_pcie_init_2_3_3,
1166 .deinit = qcom_pcie_deinit_2_3_3,
1167 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1168};
1169
1170static const struct dw_pcie_ops dw_pcie_ops = {
1171 .link_up = qcom_pcie_link_up,
1172};
1173
1174static int qcom_pcie_probe(struct platform_device *pdev)
1175{
1176 struct device *dev = &pdev->dev;
1177 struct resource *res;
1178 struct pcie_port *pp;
1179 struct dw_pcie *pci;
1180 struct qcom_pcie *pcie;
1181 int ret;
1182
1183 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1184 if (!pcie)
1185 return -ENOMEM;
1186
1187 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1188 if (!pci)
1189 return -ENOMEM;
1190
1191 pm_runtime_enable(dev);
1192 ret = pm_runtime_get_sync(dev);
1193 if (ret < 0) {
1194 pm_runtime_disable(dev);
1195 return ret;
1196 }
1197
1198 pci->dev = dev;
1199 pci->ops = &dw_pcie_ops;
1200 pp = &pci->pp;
1201
1202 pcie->pci = pci;
1203
1204 pcie->ops = of_device_get_match_data(dev);
1205
1206 pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
1207 if (IS_ERR(pcie->reset)) {
1208 ret = PTR_ERR(pcie->reset);
1209 goto err_pm_runtime_put;
1210 }
1211
1212 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf");
1213 pcie->parf = devm_ioremap_resource(dev, res);
1214 if (IS_ERR(pcie->parf)) {
1215 ret = PTR_ERR(pcie->parf);
1216 goto err_pm_runtime_put;
1217 }
1218
1219 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
1220 pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
1221 if (IS_ERR(pci->dbi_base)) {
1222 ret = PTR_ERR(pci->dbi_base);
1223 goto err_pm_runtime_put;
1224 }
1225
1226 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
1227 pcie->elbi = devm_ioremap_resource(dev, res);
1228 if (IS_ERR(pcie->elbi)) {
1229 ret = PTR_ERR(pcie->elbi);
1230 goto err_pm_runtime_put;
1231 }
1232
1233 pcie->phy = devm_phy_optional_get(dev, "pciephy");
1234 if (IS_ERR(pcie->phy)) {
1235 ret = PTR_ERR(pcie->phy);
1236 goto err_pm_runtime_put;
1237 }
1238
1239 ret = pcie->ops->get_resources(pcie);
1240 if (ret)
1241 goto err_pm_runtime_put;
1242
1243 pp->ops = &qcom_pcie_dw_ops;
1244
1245 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1246 pp->msi_irq = platform_get_irq_byname(pdev, "msi");
1247 if (pp->msi_irq < 0) {
1248 ret = pp->msi_irq;
1249 goto err_pm_runtime_put;
1250 }
1251 }
1252
1253 ret = phy_init(pcie->phy);
1254 if (ret) {
1255 pm_runtime_disable(&pdev->dev);
1256 goto err_pm_runtime_put;
1257 }
1258
1259 platform_set_drvdata(pdev, pcie);
1260
1261 ret = dw_pcie_host_init(pp);
1262 if (ret) {
1263 dev_err(dev, "cannot initialize host\n");
1264 pm_runtime_disable(&pdev->dev);
1265 goto err_pm_runtime_put;
1266 }
1267
1268 return 0;
1269
1270err_pm_runtime_put:
1271 pm_runtime_put(dev);
1272 pm_runtime_disable(dev);
1273
1274 return ret;
1275}
1276
1277static const struct of_device_id qcom_pcie_match[] = {
1278 { .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
1279 { .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 },
1280 { .compatible = "qcom,pcie-apq8064", .data = &ops_2_1_0 },
1281 { .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
1282 { .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
1283 { .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
1284 { .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 },
1285 { }
1286};
1287
1288static void qcom_fixup_class(struct pci_dev *dev)
1289{
1290 dev->class = PCI_CLASS_BRIDGE_PCI << 8;
1291}
1292DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, PCI_ANY_ID, qcom_fixup_class);
1293
1294static struct platform_driver qcom_pcie_driver = {
1295 .probe = qcom_pcie_probe,
1296 .driver = {
1297 .name = "qcom-pcie",
1298 .suppress_bind_attrs = true,
1299 .of_match_table = qcom_pcie_match,
1300 },
1301};
1302builtin_platform_driver(qcom_pcie_driver);