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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/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#define PARF_BDF_TO_SID_CFG 0x2c00
57
58/* ELBI registers */
59#define ELBI_SYS_CTRL 0x04
60
61/* DBI registers */
62#define AXI_MSTR_RESP_COMP_CTRL0 0x818
63#define AXI_MSTR_RESP_COMP_CTRL1 0x81c
64
65/* MHI registers */
66#define PARF_DEBUG_CNT_PM_LINKST_IN_L2 0xc04
67#define PARF_DEBUG_CNT_PM_LINKST_IN_L1 0xc0c
68#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S 0xc10
69#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1 0xc84
70#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2 0xc88
71
72/* PARF_SYS_CTRL register fields */
73#define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN BIT(29)
74#define MST_WAKEUP_EN BIT(13)
75#define SLV_WAKEUP_EN BIT(12)
76#define MSTR_ACLK_CGC_DIS BIT(10)
77#define SLV_ACLK_CGC_DIS BIT(9)
78#define CORE_CLK_CGC_DIS BIT(6)
79#define AUX_PWR_DET BIT(4)
80#define L23_CLK_RMV_DIS BIT(2)
81#define L1_CLK_RMV_DIS BIT(1)
82
83/* PARF_PM_CTRL register fields */
84#define REQ_NOT_ENTR_L1 BIT(5)
85
86/* PARF_PCS_DEEMPH register fields */
87#define PCS_DEEMPH_TX_DEEMPH_GEN1(x) FIELD_PREP(GENMASK(21, 16), x)
88#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) FIELD_PREP(GENMASK(13, 8), x)
89#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x) FIELD_PREP(GENMASK(5, 0), x)
90
91/* PARF_PCS_SWING register fields */
92#define PCS_SWING_TX_SWING_FULL(x) FIELD_PREP(GENMASK(14, 8), x)
93#define PCS_SWING_TX_SWING_LOW(x) FIELD_PREP(GENMASK(6, 0), x)
94
95/* PARF_PHY_CTRL register fields */
96#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK GENMASK(20, 16)
97#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x) FIELD_PREP(PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK, x)
98#define PHY_TEST_PWR_DOWN BIT(0)
99
100/* PARF_PHY_REFCLK register fields */
101#define PHY_REFCLK_SSP_EN BIT(16)
102#define PHY_REFCLK_USE_PAD BIT(12)
103
104/* PARF_CONFIG_BITS register fields */
105#define PHY_RX0_EQ(x) FIELD_PREP(GENMASK(26, 24), x)
106
107/* PARF_SLV_ADDR_SPACE_SIZE register value */
108#define SLV_ADDR_SPACE_SZ 0x10000000
109
110/* PARF_MHI_CLOCK_RESET_CTRL register fields */
111#define AHB_CLK_EN BIT(0)
112#define MSTR_AXI_CLK_EN BIT(1)
113#define BYPASS BIT(4)
114
115/* PARF_AXI_MSTR_WR_ADDR_HALT register fields */
116#define EN BIT(31)
117
118/* PARF_LTSSM register fields */
119#define LTSSM_EN BIT(8)
120
121/* PARF_DEVICE_TYPE register fields */
122#define DEVICE_TYPE_RC 0x4
123
124/* PARF_BDF_TO_SID_CFG fields */
125#define BDF_TO_SID_BYPASS BIT(0)
126
127/* ELBI_SYS_CTRL register fields */
128#define ELBI_SYS_CTRL_LT_ENABLE BIT(0)
129
130/* AXI_MSTR_RESP_COMP_CTRL0 register fields */
131#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K 0x4
132#define CFG_REMOTE_RD_REQ_BRIDGE_SIZE_4K 0x5
133
134/* AXI_MSTR_RESP_COMP_CTRL1 register fields */
135#define CFG_BRIDGE_SB_INIT BIT(0)
136
137/* PCI_EXP_SLTCAP register fields */
138#define PCIE_CAP_SLOT_POWER_LIMIT_VAL FIELD_PREP(PCI_EXP_SLTCAP_SPLV, 250)
139#define PCIE_CAP_SLOT_POWER_LIMIT_SCALE FIELD_PREP(PCI_EXP_SLTCAP_SPLS, 1)
140#define PCIE_CAP_SLOT_VAL (PCI_EXP_SLTCAP_ABP | \
141 PCI_EXP_SLTCAP_PCP | \
142 PCI_EXP_SLTCAP_MRLSP | \
143 PCI_EXP_SLTCAP_AIP | \
144 PCI_EXP_SLTCAP_PIP | \
145 PCI_EXP_SLTCAP_HPS | \
146 PCI_EXP_SLTCAP_EIP | \
147 PCIE_CAP_SLOT_POWER_LIMIT_VAL | \
148 PCIE_CAP_SLOT_POWER_LIMIT_SCALE)
149
150#define PERST_DELAY_US 1000
151
152#define QCOM_PCIE_CRC8_POLYNOMIAL (BIT(2) | BIT(1) | BIT(0))
153
154#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \
155 Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed]))
156
157#define QCOM_PCIE_1_0_0_MAX_CLOCKS 4
158struct qcom_pcie_resources_1_0_0 {
159 struct clk_bulk_data clks[QCOM_PCIE_1_0_0_MAX_CLOCKS];
160 struct reset_control *core;
161 struct regulator *vdda;
162};
163
164#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5
165#define QCOM_PCIE_2_1_0_MAX_RESETS 6
166#define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
167struct qcom_pcie_resources_2_1_0 {
168 struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS];
169 struct reset_control_bulk_data resets[QCOM_PCIE_2_1_0_MAX_RESETS];
170 int num_resets;
171 struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
172};
173
174#define QCOM_PCIE_2_3_2_MAX_CLOCKS 4
175#define QCOM_PCIE_2_3_2_MAX_SUPPLY 2
176struct qcom_pcie_resources_2_3_2 {
177 struct clk_bulk_data clks[QCOM_PCIE_2_3_2_MAX_CLOCKS];
178 struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
179};
180
181#define QCOM_PCIE_2_3_3_MAX_CLOCKS 5
182#define QCOM_PCIE_2_3_3_MAX_RESETS 7
183struct qcom_pcie_resources_2_3_3 {
184 struct clk_bulk_data clks[QCOM_PCIE_2_3_3_MAX_CLOCKS];
185 struct reset_control_bulk_data rst[QCOM_PCIE_2_3_3_MAX_RESETS];
186};
187
188#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4
189#define QCOM_PCIE_2_4_0_MAX_RESETS 12
190struct qcom_pcie_resources_2_4_0 {
191 struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
192 int num_clks;
193 struct reset_control_bulk_data resets[QCOM_PCIE_2_4_0_MAX_RESETS];
194 int num_resets;
195};
196
197#define QCOM_PCIE_2_7_0_MAX_CLOCKS 15
198#define QCOM_PCIE_2_7_0_MAX_SUPPLIES 2
199struct qcom_pcie_resources_2_7_0 {
200 struct clk_bulk_data clks[QCOM_PCIE_2_7_0_MAX_CLOCKS];
201 int num_clks;
202 struct regulator_bulk_data supplies[QCOM_PCIE_2_7_0_MAX_SUPPLIES];
203 struct reset_control *rst;
204};
205
206#define QCOM_PCIE_2_9_0_MAX_CLOCKS 5
207struct qcom_pcie_resources_2_9_0 {
208 struct clk_bulk_data clks[QCOM_PCIE_2_9_0_MAX_CLOCKS];
209 struct reset_control *rst;
210};
211
212union qcom_pcie_resources {
213 struct qcom_pcie_resources_1_0_0 v1_0_0;
214 struct qcom_pcie_resources_2_1_0 v2_1_0;
215 struct qcom_pcie_resources_2_3_2 v2_3_2;
216 struct qcom_pcie_resources_2_3_3 v2_3_3;
217 struct qcom_pcie_resources_2_4_0 v2_4_0;
218 struct qcom_pcie_resources_2_7_0 v2_7_0;
219 struct qcom_pcie_resources_2_9_0 v2_9_0;
220};
221
222struct qcom_pcie;
223
224struct qcom_pcie_ops {
225 int (*get_resources)(struct qcom_pcie *pcie);
226 int (*init)(struct qcom_pcie *pcie);
227 int (*post_init)(struct qcom_pcie *pcie);
228 void (*host_post_init)(struct qcom_pcie *pcie);
229 void (*deinit)(struct qcom_pcie *pcie);
230 void (*ltssm_enable)(struct qcom_pcie *pcie);
231 int (*config_sid)(struct qcom_pcie *pcie);
232};
233
234struct qcom_pcie_cfg {
235 const struct qcom_pcie_ops *ops;
236 bool no_l0s;
237};
238
239struct qcom_pcie {
240 struct dw_pcie *pci;
241 void __iomem *parf; /* DT parf */
242 void __iomem *elbi; /* DT elbi */
243 void __iomem *mhi;
244 union qcom_pcie_resources res;
245 struct phy *phy;
246 struct gpio_desc *reset;
247 struct icc_path *icc_mem;
248 const struct qcom_pcie_cfg *cfg;
249 struct dentry *debugfs;
250 bool suspended;
251};
252
253#define to_qcom_pcie(x) dev_get_drvdata((x)->dev)
254
255static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
256{
257 gpiod_set_value_cansleep(pcie->reset, 1);
258 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
259}
260
261static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
262{
263 /* Ensure that PERST has been asserted for at least 100 ms */
264 msleep(100);
265 gpiod_set_value_cansleep(pcie->reset, 0);
266 usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
267}
268
269static int qcom_pcie_start_link(struct dw_pcie *pci)
270{
271 struct qcom_pcie *pcie = to_qcom_pcie(pci);
272
273 /* Enable Link Training state machine */
274 if (pcie->cfg->ops->ltssm_enable)
275 pcie->cfg->ops->ltssm_enable(pcie);
276
277 return 0;
278}
279
280static void qcom_pcie_clear_aspm_l0s(struct dw_pcie *pci)
281{
282 struct qcom_pcie *pcie = to_qcom_pcie(pci);
283 u16 offset;
284 u32 val;
285
286 if (!pcie->cfg->no_l0s)
287 return;
288
289 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
290
291 dw_pcie_dbi_ro_wr_en(pci);
292
293 val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
294 val &= ~PCI_EXP_LNKCAP_ASPM_L0S;
295 writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP);
296
297 dw_pcie_dbi_ro_wr_dis(pci);
298}
299
300static void qcom_pcie_clear_hpc(struct dw_pcie *pci)
301{
302 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
303 u32 val;
304
305 dw_pcie_dbi_ro_wr_en(pci);
306
307 val = readl(pci->dbi_base + offset + PCI_EXP_SLTCAP);
308 val &= ~PCI_EXP_SLTCAP_HPC;
309 writel(val, pci->dbi_base + offset + PCI_EXP_SLTCAP);
310
311 dw_pcie_dbi_ro_wr_dis(pci);
312}
313
314static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
315{
316 u32 val;
317
318 /* enable link training */
319 val = readl(pcie->elbi + ELBI_SYS_CTRL);
320 val |= ELBI_SYS_CTRL_LT_ENABLE;
321 writel(val, pcie->elbi + ELBI_SYS_CTRL);
322}
323
324static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
325{
326 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
327 struct dw_pcie *pci = pcie->pci;
328 struct device *dev = pci->dev;
329 bool is_apq = of_device_is_compatible(dev->of_node, "qcom,pcie-apq8064");
330 int ret;
331
332 res->supplies[0].supply = "vdda";
333 res->supplies[1].supply = "vdda_phy";
334 res->supplies[2].supply = "vdda_refclk";
335 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
336 res->supplies);
337 if (ret)
338 return ret;
339
340 res->clks[0].id = "iface";
341 res->clks[1].id = "core";
342 res->clks[2].id = "phy";
343 res->clks[3].id = "aux";
344 res->clks[4].id = "ref";
345
346 /* iface, core, phy are required */
347 ret = devm_clk_bulk_get(dev, 3, res->clks);
348 if (ret < 0)
349 return ret;
350
351 /* aux, ref are optional */
352 ret = devm_clk_bulk_get_optional(dev, 2, res->clks + 3);
353 if (ret < 0)
354 return ret;
355
356 res->resets[0].id = "pci";
357 res->resets[1].id = "axi";
358 res->resets[2].id = "ahb";
359 res->resets[3].id = "por";
360 res->resets[4].id = "phy";
361 res->resets[5].id = "ext";
362
363 /* ext is optional on APQ8016 */
364 res->num_resets = is_apq ? 5 : 6;
365 ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
366 if (ret < 0)
367 return ret;
368
369 return 0;
370}
371
372static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
373{
374 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
375
376 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
377 reset_control_bulk_assert(res->num_resets, res->resets);
378
379 writel(1, pcie->parf + PARF_PHY_CTRL);
380
381 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
382}
383
384static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
385{
386 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
387 struct dw_pcie *pci = pcie->pci;
388 struct device *dev = pci->dev;
389 int ret;
390
391 /* reset the PCIe interface as uboot can leave it undefined state */
392 ret = reset_control_bulk_assert(res->num_resets, res->resets);
393 if (ret < 0) {
394 dev_err(dev, "cannot assert resets\n");
395 return ret;
396 }
397
398 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
399 if (ret < 0) {
400 dev_err(dev, "cannot enable regulators\n");
401 return ret;
402 }
403
404 ret = reset_control_bulk_deassert(res->num_resets, res->resets);
405 if (ret < 0) {
406 dev_err(dev, "cannot deassert resets\n");
407 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
408 return ret;
409 }
410
411 return 0;
412}
413
414static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie)
415{
416 struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
417 struct dw_pcie *pci = pcie->pci;
418 struct device *dev = pci->dev;
419 struct device_node *node = dev->of_node;
420 u32 val;
421 int ret;
422
423 /* enable PCIe clocks and resets */
424 val = readl(pcie->parf + PARF_PHY_CTRL);
425 val &= ~PHY_TEST_PWR_DOWN;
426 writel(val, pcie->parf + PARF_PHY_CTRL);
427
428 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
429 if (ret)
430 return ret;
431
432 if (of_device_is_compatible(node, "qcom,pcie-ipq8064") ||
433 of_device_is_compatible(node, "qcom,pcie-ipq8064-v2")) {
434 writel(PCS_DEEMPH_TX_DEEMPH_GEN1(24) |
435 PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(24) |
436 PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(34),
437 pcie->parf + PARF_PCS_DEEMPH);
438 writel(PCS_SWING_TX_SWING_FULL(120) |
439 PCS_SWING_TX_SWING_LOW(120),
440 pcie->parf + PARF_PCS_SWING);
441 writel(PHY_RX0_EQ(4), pcie->parf + PARF_CONFIG_BITS);
442 }
443
444 if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) {
445 /* set TX termination offset */
446 val = readl(pcie->parf + PARF_PHY_CTRL);
447 val &= ~PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK;
448 val |= PHY_CTRL_PHY_TX0_TERM_OFFSET(7);
449 writel(val, pcie->parf + PARF_PHY_CTRL);
450 }
451
452 /* enable external reference clock */
453 val = readl(pcie->parf + PARF_PHY_REFCLK);
454 /* USE_PAD is required only for ipq806x */
455 if (!of_device_is_compatible(node, "qcom,pcie-apq8064"))
456 val &= ~PHY_REFCLK_USE_PAD;
457 val |= PHY_REFCLK_SSP_EN;
458 writel(val, pcie->parf + PARF_PHY_REFCLK);
459
460 /* wait for clock acquisition */
461 usleep_range(1000, 1500);
462
463 /* Set the Max TLP size to 2K, instead of using default of 4K */
464 writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K,
465 pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL0);
466 writel(CFG_BRIDGE_SB_INIT,
467 pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL1);
468
469 qcom_pcie_clear_hpc(pcie->pci);
470
471 return 0;
472}
473
474static int qcom_pcie_get_resources_1_0_0(struct qcom_pcie *pcie)
475{
476 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
477 struct dw_pcie *pci = pcie->pci;
478 struct device *dev = pci->dev;
479 int ret;
480
481 res->vdda = devm_regulator_get(dev, "vdda");
482 if (IS_ERR(res->vdda))
483 return PTR_ERR(res->vdda);
484
485 res->clks[0].id = "iface";
486 res->clks[1].id = "aux";
487 res->clks[2].id = "master_bus";
488 res->clks[3].id = "slave_bus";
489
490 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
491 if (ret < 0)
492 return ret;
493
494 res->core = devm_reset_control_get_exclusive(dev, "core");
495 return PTR_ERR_OR_ZERO(res->core);
496}
497
498static void qcom_pcie_deinit_1_0_0(struct qcom_pcie *pcie)
499{
500 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
501
502 reset_control_assert(res->core);
503 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
504 regulator_disable(res->vdda);
505}
506
507static int qcom_pcie_init_1_0_0(struct qcom_pcie *pcie)
508{
509 struct qcom_pcie_resources_1_0_0 *res = &pcie->res.v1_0_0;
510 struct dw_pcie *pci = pcie->pci;
511 struct device *dev = pci->dev;
512 int ret;
513
514 ret = reset_control_deassert(res->core);
515 if (ret) {
516 dev_err(dev, "cannot deassert core reset\n");
517 return ret;
518 }
519
520 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
521 if (ret) {
522 dev_err(dev, "cannot prepare/enable clocks\n");
523 goto err_assert_reset;
524 }
525
526 ret = regulator_enable(res->vdda);
527 if (ret) {
528 dev_err(dev, "cannot enable vdda regulator\n");
529 goto err_disable_clks;
530 }
531
532 return 0;
533
534err_disable_clks:
535 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
536err_assert_reset:
537 reset_control_assert(res->core);
538
539 return ret;
540}
541
542static int qcom_pcie_post_init_1_0_0(struct qcom_pcie *pcie)
543{
544 /* change DBI base address */
545 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
546
547 if (IS_ENABLED(CONFIG_PCI_MSI)) {
548 u32 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
549
550 val |= EN;
551 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT);
552 }
553
554 qcom_pcie_clear_hpc(pcie->pci);
555
556 return 0;
557}
558
559static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
560{
561 u32 val;
562
563 /* enable link training */
564 val = readl(pcie->parf + PARF_LTSSM);
565 val |= LTSSM_EN;
566 writel(val, pcie->parf + PARF_LTSSM);
567}
568
569static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
570{
571 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
572 struct dw_pcie *pci = pcie->pci;
573 struct device *dev = pci->dev;
574 int ret;
575
576 res->supplies[0].supply = "vdda";
577 res->supplies[1].supply = "vddpe-3v3";
578 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
579 res->supplies);
580 if (ret)
581 return ret;
582
583 res->clks[0].id = "aux";
584 res->clks[1].id = "cfg";
585 res->clks[2].id = "bus_master";
586 res->clks[3].id = "bus_slave";
587
588 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
589 if (ret < 0)
590 return ret;
591
592 return 0;
593}
594
595static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
596{
597 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
598
599 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
600 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
601}
602
603static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
604{
605 struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
606 struct dw_pcie *pci = pcie->pci;
607 struct device *dev = pci->dev;
608 int ret;
609
610 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
611 if (ret < 0) {
612 dev_err(dev, "cannot enable regulators\n");
613 return ret;
614 }
615
616 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
617 if (ret) {
618 dev_err(dev, "cannot prepare/enable clocks\n");
619 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
620 return ret;
621 }
622
623 return 0;
624}
625
626static int qcom_pcie_post_init_2_3_2(struct qcom_pcie *pcie)
627{
628 u32 val;
629
630 /* enable PCIe clocks and resets */
631 val = readl(pcie->parf + PARF_PHY_CTRL);
632 val &= ~PHY_TEST_PWR_DOWN;
633 writel(val, pcie->parf + PARF_PHY_CTRL);
634
635 /* change DBI base address */
636 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
637
638 /* MAC PHY_POWERDOWN MUX DISABLE */
639 val = readl(pcie->parf + PARF_SYS_CTRL);
640 val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
641 writel(val, pcie->parf + PARF_SYS_CTRL);
642
643 val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
644 val |= BYPASS;
645 writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
646
647 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
648 val |= EN;
649 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
650
651 qcom_pcie_clear_hpc(pcie->pci);
652
653 return 0;
654}
655
656static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
657{
658 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
659 struct dw_pcie *pci = pcie->pci;
660 struct device *dev = pci->dev;
661 bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019");
662 int ret;
663
664 res->clks[0].id = "aux";
665 res->clks[1].id = "master_bus";
666 res->clks[2].id = "slave_bus";
667 res->clks[3].id = "iface";
668
669 /* qcom,pcie-ipq4019 is defined without "iface" */
670 res->num_clks = is_ipq ? 3 : 4;
671
672 ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
673 if (ret < 0)
674 return ret;
675
676 res->resets[0].id = "axi_m";
677 res->resets[1].id = "axi_s";
678 res->resets[2].id = "axi_m_sticky";
679 res->resets[3].id = "pipe_sticky";
680 res->resets[4].id = "pwr";
681 res->resets[5].id = "ahb";
682 res->resets[6].id = "pipe";
683 res->resets[7].id = "axi_m_vmid";
684 res->resets[8].id = "axi_s_xpu";
685 res->resets[9].id = "parf";
686 res->resets[10].id = "phy";
687 res->resets[11].id = "phy_ahb";
688
689 res->num_resets = is_ipq ? 12 : 6;
690
691 ret = devm_reset_control_bulk_get_exclusive(dev, res->num_resets, res->resets);
692 if (ret < 0)
693 return ret;
694
695 return 0;
696}
697
698static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
699{
700 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
701
702 reset_control_bulk_assert(res->num_resets, res->resets);
703 clk_bulk_disable_unprepare(res->num_clks, res->clks);
704}
705
706static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
707{
708 struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
709 struct dw_pcie *pci = pcie->pci;
710 struct device *dev = pci->dev;
711 int ret;
712
713 ret = reset_control_bulk_assert(res->num_resets, res->resets);
714 if (ret < 0) {
715 dev_err(dev, "cannot assert resets\n");
716 return ret;
717 }
718
719 usleep_range(10000, 12000);
720
721 ret = reset_control_bulk_deassert(res->num_resets, res->resets);
722 if (ret < 0) {
723 dev_err(dev, "cannot deassert resets\n");
724 return ret;
725 }
726
727 usleep_range(10000, 12000);
728
729 ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
730 if (ret) {
731 reset_control_bulk_assert(res->num_resets, res->resets);
732 return ret;
733 }
734
735 return 0;
736}
737
738static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
739{
740 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
741 struct dw_pcie *pci = pcie->pci;
742 struct device *dev = pci->dev;
743 int ret;
744
745 res->clks[0].id = "iface";
746 res->clks[1].id = "axi_m";
747 res->clks[2].id = "axi_s";
748 res->clks[3].id = "ahb";
749 res->clks[4].id = "aux";
750
751 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
752 if (ret < 0)
753 return ret;
754
755 res->rst[0].id = "axi_m";
756 res->rst[1].id = "axi_s";
757 res->rst[2].id = "pipe";
758 res->rst[3].id = "axi_m_sticky";
759 res->rst[4].id = "sticky";
760 res->rst[5].id = "ahb";
761 res->rst[6].id = "sleep";
762
763 ret = devm_reset_control_bulk_get_exclusive(dev, ARRAY_SIZE(res->rst), res->rst);
764 if (ret < 0)
765 return ret;
766
767 return 0;
768}
769
770static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
771{
772 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
773
774 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
775}
776
777static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
778{
779 struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
780 struct dw_pcie *pci = pcie->pci;
781 struct device *dev = pci->dev;
782 int ret;
783
784 ret = reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
785 if (ret < 0) {
786 dev_err(dev, "cannot assert resets\n");
787 return ret;
788 }
789
790 usleep_range(2000, 2500);
791
792 ret = reset_control_bulk_deassert(ARRAY_SIZE(res->rst), res->rst);
793 if (ret < 0) {
794 dev_err(dev, "cannot deassert resets\n");
795 return ret;
796 }
797
798 /*
799 * Don't have a way to see if the reset has completed.
800 * Wait for some time.
801 */
802 usleep_range(2000, 2500);
803
804 ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
805 if (ret) {
806 dev_err(dev, "cannot prepare/enable clocks\n");
807 goto err_assert_resets;
808 }
809
810 return 0;
811
812err_assert_resets:
813 /*
814 * Not checking for failure, will anyway return
815 * the original failure in 'ret'.
816 */
817 reset_control_bulk_assert(ARRAY_SIZE(res->rst), res->rst);
818
819 return ret;
820}
821
822static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
823{
824 struct dw_pcie *pci = pcie->pci;
825 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
826 u32 val;
827
828 writel(SLV_ADDR_SPACE_SZ, pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
829
830 val = readl(pcie->parf + PARF_PHY_CTRL);
831 val &= ~PHY_TEST_PWR_DOWN;
832 writel(val, pcie->parf + PARF_PHY_CTRL);
833
834 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
835
836 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
837 | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
838 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
839 pcie->parf + PARF_SYS_CTRL);
840 writel(0, pcie->parf + PARF_Q2A_FLUSH);
841
842 writel(PCI_COMMAND_MASTER, pci->dbi_base + PCI_COMMAND);
843
844 dw_pcie_dbi_ro_wr_en(pci);
845
846 writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
847
848 val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
849 val &= ~PCI_EXP_LNKCAP_ASPMS;
850 writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP);
851
852 writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset +
853 PCI_EXP_DEVCTL2);
854
855 dw_pcie_dbi_ro_wr_dis(pci);
856
857 return 0;
858}
859
860static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
861{
862 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
863 struct dw_pcie *pci = pcie->pci;
864 struct device *dev = pci->dev;
865 unsigned int num_clks, num_opt_clks;
866 unsigned int idx;
867 int ret;
868
869 res->rst = devm_reset_control_array_get_exclusive(dev);
870 if (IS_ERR(res->rst))
871 return PTR_ERR(res->rst);
872
873 res->supplies[0].supply = "vdda";
874 res->supplies[1].supply = "vddpe-3v3";
875 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
876 res->supplies);
877 if (ret)
878 return ret;
879
880 idx = 0;
881 res->clks[idx++].id = "aux";
882 res->clks[idx++].id = "cfg";
883 res->clks[idx++].id = "bus_master";
884 res->clks[idx++].id = "bus_slave";
885 res->clks[idx++].id = "slave_q2a";
886
887 num_clks = idx;
888
889 ret = devm_clk_bulk_get(dev, num_clks, res->clks);
890 if (ret < 0)
891 return ret;
892
893 res->clks[idx++].id = "tbu";
894 res->clks[idx++].id = "ddrss_sf_tbu";
895 res->clks[idx++].id = "aggre0";
896 res->clks[idx++].id = "aggre1";
897 res->clks[idx++].id = "noc_aggr";
898 res->clks[idx++].id = "noc_aggr_4";
899 res->clks[idx++].id = "noc_aggr_south_sf";
900 res->clks[idx++].id = "cnoc_qx";
901 res->clks[idx++].id = "sleep";
902 res->clks[idx++].id = "cnoc_sf_axi";
903
904 num_opt_clks = idx - num_clks;
905 res->num_clks = idx;
906
907 ret = devm_clk_bulk_get_optional(dev, num_opt_clks, res->clks + num_clks);
908 if (ret < 0)
909 return ret;
910
911 return 0;
912}
913
914static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
915{
916 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
917 struct dw_pcie *pci = pcie->pci;
918 struct device *dev = pci->dev;
919 u32 val;
920 int ret;
921
922 ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
923 if (ret < 0) {
924 dev_err(dev, "cannot enable regulators\n");
925 return ret;
926 }
927
928 ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
929 if (ret < 0)
930 goto err_disable_regulators;
931
932 ret = reset_control_assert(res->rst);
933 if (ret) {
934 dev_err(dev, "reset assert failed (%d)\n", ret);
935 goto err_disable_clocks;
936 }
937
938 usleep_range(1000, 1500);
939
940 ret = reset_control_deassert(res->rst);
941 if (ret) {
942 dev_err(dev, "reset deassert failed (%d)\n", ret);
943 goto err_disable_clocks;
944 }
945
946 /* Wait for reset to complete, required on SM8450 */
947 usleep_range(1000, 1500);
948
949 /* configure PCIe to RC mode */
950 writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
951
952 /* enable PCIe clocks and resets */
953 val = readl(pcie->parf + PARF_PHY_CTRL);
954 val &= ~PHY_TEST_PWR_DOWN;
955 writel(val, pcie->parf + PARF_PHY_CTRL);
956
957 /* change DBI base address */
958 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
959
960 /* MAC PHY_POWERDOWN MUX DISABLE */
961 val = readl(pcie->parf + PARF_SYS_CTRL);
962 val &= ~MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN;
963 writel(val, pcie->parf + PARF_SYS_CTRL);
964
965 val = readl(pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
966 val |= BYPASS;
967 writel(val, pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
968
969 /* Enable L1 and L1SS */
970 val = readl(pcie->parf + PARF_PM_CTRL);
971 val &= ~REQ_NOT_ENTR_L1;
972 writel(val, pcie->parf + PARF_PM_CTRL);
973
974 val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
975 val |= EN;
976 writel(val, pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2);
977
978 return 0;
979err_disable_clocks:
980 clk_bulk_disable_unprepare(res->num_clks, res->clks);
981err_disable_regulators:
982 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
983
984 return ret;
985}
986
987static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie)
988{
989 qcom_pcie_clear_aspm_l0s(pcie->pci);
990 qcom_pcie_clear_hpc(pcie->pci);
991
992 return 0;
993}
994
995static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata)
996{
997 /*
998 * Downstream devices need to be in D0 state before enabling PCI PM
999 * substates.
1000 */
1001 pci_set_power_state_locked(pdev, PCI_D0);
1002 pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
1003
1004 return 0;
1005}
1006
1007static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie)
1008{
1009 struct dw_pcie_rp *pp = &pcie->pci->pp;
1010
1011 pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL);
1012}
1013
1014static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
1015{
1016 struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
1017
1018 clk_bulk_disable_unprepare(res->num_clks, res->clks);
1019
1020 regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
1021}
1022
1023static int qcom_pcie_config_sid_1_9_0(struct qcom_pcie *pcie)
1024{
1025 /* iommu map structure */
1026 struct {
1027 u32 bdf;
1028 u32 phandle;
1029 u32 smmu_sid;
1030 u32 smmu_sid_len;
1031 } *map;
1032 void __iomem *bdf_to_sid_base = pcie->parf + PARF_BDF_TO_SID_TABLE_N;
1033 struct device *dev = pcie->pci->dev;
1034 u8 qcom_pcie_crc8_table[CRC8_TABLE_SIZE];
1035 int i, nr_map, size = 0;
1036 u32 smmu_sid_base;
1037 u32 val;
1038
1039 of_get_property(dev->of_node, "iommu-map", &size);
1040 if (!size)
1041 return 0;
1042
1043 /* Enable BDF to SID translation by disabling bypass mode (default) */
1044 val = readl(pcie->parf + PARF_BDF_TO_SID_CFG);
1045 val &= ~BDF_TO_SID_BYPASS;
1046 writel(val, pcie->parf + PARF_BDF_TO_SID_CFG);
1047
1048 map = kzalloc(size, GFP_KERNEL);
1049 if (!map)
1050 return -ENOMEM;
1051
1052 of_property_read_u32_array(dev->of_node, "iommu-map", (u32 *)map,
1053 size / sizeof(u32));
1054
1055 nr_map = size / (sizeof(*map));
1056
1057 crc8_populate_msb(qcom_pcie_crc8_table, QCOM_PCIE_CRC8_POLYNOMIAL);
1058
1059 /* Registers need to be zero out first */
1060 memset_io(bdf_to_sid_base, 0, CRC8_TABLE_SIZE * sizeof(u32));
1061
1062 /* Extract the SMMU SID base from the first entry of iommu-map */
1063 smmu_sid_base = map[0].smmu_sid;
1064
1065 /* Look for an available entry to hold the mapping */
1066 for (i = 0; i < nr_map; i++) {
1067 __be16 bdf_be = cpu_to_be16(map[i].bdf);
1068 u32 val;
1069 u8 hash;
1070
1071 hash = crc8(qcom_pcie_crc8_table, (u8 *)&bdf_be, sizeof(bdf_be), 0);
1072
1073 val = readl(bdf_to_sid_base + hash * sizeof(u32));
1074
1075 /* If the register is already populated, look for next available entry */
1076 while (val) {
1077 u8 current_hash = hash++;
1078 u8 next_mask = 0xff;
1079
1080 /* If NEXT field is NULL then update it with next hash */
1081 if (!(val & next_mask)) {
1082 val |= (u32)hash;
1083 writel(val, bdf_to_sid_base + current_hash * sizeof(u32));
1084 }
1085
1086 val = readl(bdf_to_sid_base + hash * sizeof(u32));
1087 }
1088
1089 /* BDF [31:16] | SID [15:8] | NEXT [7:0] */
1090 val = map[i].bdf << 16 | (map[i].smmu_sid - smmu_sid_base) << 8 | 0;
1091 writel(val, bdf_to_sid_base + hash * sizeof(u32));
1092 }
1093
1094 kfree(map);
1095
1096 return 0;
1097}
1098
1099static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
1100{
1101 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1102 struct dw_pcie *pci = pcie->pci;
1103 struct device *dev = pci->dev;
1104 int ret;
1105
1106 res->clks[0].id = "iface";
1107 res->clks[1].id = "axi_m";
1108 res->clks[2].id = "axi_s";
1109 res->clks[3].id = "axi_bridge";
1110 res->clks[4].id = "rchng";
1111
1112 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
1113 if (ret < 0)
1114 return ret;
1115
1116 res->rst = devm_reset_control_array_get_exclusive(dev);
1117 if (IS_ERR(res->rst))
1118 return PTR_ERR(res->rst);
1119
1120 return 0;
1121}
1122
1123static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie)
1124{
1125 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1126
1127 clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
1128}
1129
1130static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
1131{
1132 struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
1133 struct device *dev = pcie->pci->dev;
1134 int ret;
1135
1136 ret = reset_control_assert(res->rst);
1137 if (ret) {
1138 dev_err(dev, "reset assert failed (%d)\n", ret);
1139 return ret;
1140 }
1141
1142 /*
1143 * Delay periods before and after reset deassert are working values
1144 * from downstream Codeaurora kernel
1145 */
1146 usleep_range(2000, 2500);
1147
1148 ret = reset_control_deassert(res->rst);
1149 if (ret) {
1150 dev_err(dev, "reset deassert failed (%d)\n", ret);
1151 return ret;
1152 }
1153
1154 usleep_range(2000, 2500);
1155
1156 return clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
1157}
1158
1159static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
1160{
1161 struct dw_pcie *pci = pcie->pci;
1162 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1163 u32 val;
1164 int i;
1165
1166 writel(SLV_ADDR_SPACE_SZ,
1167 pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
1168
1169 val = readl(pcie->parf + PARF_PHY_CTRL);
1170 val &= ~PHY_TEST_PWR_DOWN;
1171 writel(val, pcie->parf + PARF_PHY_CTRL);
1172
1173 writel(0, pcie->parf + PARF_DBI_BASE_ADDR);
1174
1175 writel(DEVICE_TYPE_RC, pcie->parf + PARF_DEVICE_TYPE);
1176 writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN,
1177 pcie->parf + PARF_MHI_CLOCK_RESET_CTRL);
1178 writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS |
1179 GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL,
1180 pci->dbi_base + GEN3_RELATED_OFF);
1181
1182 writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS |
1183 SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
1184 AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
1185 pcie->parf + PARF_SYS_CTRL);
1186
1187 writel(0, pcie->parf + PARF_Q2A_FLUSH);
1188
1189 dw_pcie_dbi_ro_wr_en(pci);
1190
1191 writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
1192
1193 val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
1194 val &= ~PCI_EXP_LNKCAP_ASPMS;
1195 writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP);
1196
1197 writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset +
1198 PCI_EXP_DEVCTL2);
1199
1200 dw_pcie_dbi_ro_wr_dis(pci);
1201
1202 for (i = 0; i < 256; i++)
1203 writel(0, pcie->parf + PARF_BDF_TO_SID_TABLE_N + (4 * i));
1204
1205 return 0;
1206}
1207
1208static int qcom_pcie_link_up(struct dw_pcie *pci)
1209{
1210 u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1211 u16 val = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
1212
1213 return !!(val & PCI_EXP_LNKSTA_DLLLA);
1214}
1215
1216static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
1217{
1218 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1219 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1220 int ret;
1221
1222 qcom_ep_reset_assert(pcie);
1223
1224 ret = pcie->cfg->ops->init(pcie);
1225 if (ret)
1226 return ret;
1227
1228 ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
1229 if (ret)
1230 goto err_deinit;
1231
1232 ret = phy_power_on(pcie->phy);
1233 if (ret)
1234 goto err_deinit;
1235
1236 if (pcie->cfg->ops->post_init) {
1237 ret = pcie->cfg->ops->post_init(pcie);
1238 if (ret)
1239 goto err_disable_phy;
1240 }
1241
1242 qcom_ep_reset_deassert(pcie);
1243
1244 if (pcie->cfg->ops->config_sid) {
1245 ret = pcie->cfg->ops->config_sid(pcie);
1246 if (ret)
1247 goto err_assert_reset;
1248 }
1249
1250 return 0;
1251
1252err_assert_reset:
1253 qcom_ep_reset_assert(pcie);
1254err_disable_phy:
1255 phy_power_off(pcie->phy);
1256err_deinit:
1257 pcie->cfg->ops->deinit(pcie);
1258
1259 return ret;
1260}
1261
1262static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp)
1263{
1264 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1265 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1266
1267 qcom_ep_reset_assert(pcie);
1268 phy_power_off(pcie->phy);
1269 pcie->cfg->ops->deinit(pcie);
1270}
1271
1272static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp)
1273{
1274 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1275 struct qcom_pcie *pcie = to_qcom_pcie(pci);
1276
1277 if (pcie->cfg->ops->host_post_init)
1278 pcie->cfg->ops->host_post_init(pcie);
1279}
1280
1281static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
1282 .init = qcom_pcie_host_init,
1283 .deinit = qcom_pcie_host_deinit,
1284 .post_init = qcom_pcie_host_post_init,
1285};
1286
1287/* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */
1288static const struct qcom_pcie_ops ops_2_1_0 = {
1289 .get_resources = qcom_pcie_get_resources_2_1_0,
1290 .init = qcom_pcie_init_2_1_0,
1291 .post_init = qcom_pcie_post_init_2_1_0,
1292 .deinit = qcom_pcie_deinit_2_1_0,
1293 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1294};
1295
1296/* Qcom IP rev.: 1.0.0 Synopsys IP rev.: 4.11a */
1297static const struct qcom_pcie_ops ops_1_0_0 = {
1298 .get_resources = qcom_pcie_get_resources_1_0_0,
1299 .init = qcom_pcie_init_1_0_0,
1300 .post_init = qcom_pcie_post_init_1_0_0,
1301 .deinit = qcom_pcie_deinit_1_0_0,
1302 .ltssm_enable = qcom_pcie_2_1_0_ltssm_enable,
1303};
1304
1305/* Qcom IP rev.: 2.3.2 Synopsys IP rev.: 4.21a */
1306static const struct qcom_pcie_ops ops_2_3_2 = {
1307 .get_resources = qcom_pcie_get_resources_2_3_2,
1308 .init = qcom_pcie_init_2_3_2,
1309 .post_init = qcom_pcie_post_init_2_3_2,
1310 .deinit = qcom_pcie_deinit_2_3_2,
1311 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1312};
1313
1314/* Qcom IP rev.: 2.4.0 Synopsys IP rev.: 4.20a */
1315static const struct qcom_pcie_ops ops_2_4_0 = {
1316 .get_resources = qcom_pcie_get_resources_2_4_0,
1317 .init = qcom_pcie_init_2_4_0,
1318 .post_init = qcom_pcie_post_init_2_3_2,
1319 .deinit = qcom_pcie_deinit_2_4_0,
1320 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1321};
1322
1323/* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */
1324static const struct qcom_pcie_ops ops_2_3_3 = {
1325 .get_resources = qcom_pcie_get_resources_2_3_3,
1326 .init = qcom_pcie_init_2_3_3,
1327 .post_init = qcom_pcie_post_init_2_3_3,
1328 .deinit = qcom_pcie_deinit_2_3_3,
1329 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1330};
1331
1332/* Qcom IP rev.: 2.7.0 Synopsys IP rev.: 4.30a */
1333static const struct qcom_pcie_ops ops_2_7_0 = {
1334 .get_resources = qcom_pcie_get_resources_2_7_0,
1335 .init = qcom_pcie_init_2_7_0,
1336 .post_init = qcom_pcie_post_init_2_7_0,
1337 .deinit = qcom_pcie_deinit_2_7_0,
1338 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1339};
1340
1341/* Qcom IP rev.: 1.9.0 */
1342static const struct qcom_pcie_ops ops_1_9_0 = {
1343 .get_resources = qcom_pcie_get_resources_2_7_0,
1344 .init = qcom_pcie_init_2_7_0,
1345 .post_init = qcom_pcie_post_init_2_7_0,
1346 .host_post_init = qcom_pcie_host_post_init_2_7_0,
1347 .deinit = qcom_pcie_deinit_2_7_0,
1348 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1349 .config_sid = qcom_pcie_config_sid_1_9_0,
1350};
1351
1352/* Qcom IP rev.: 2.9.0 Synopsys IP rev.: 5.00a */
1353static const struct qcom_pcie_ops ops_2_9_0 = {
1354 .get_resources = qcom_pcie_get_resources_2_9_0,
1355 .init = qcom_pcie_init_2_9_0,
1356 .post_init = qcom_pcie_post_init_2_9_0,
1357 .deinit = qcom_pcie_deinit_2_9_0,
1358 .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
1359};
1360
1361static const struct qcom_pcie_cfg cfg_1_0_0 = {
1362 .ops = &ops_1_0_0,
1363};
1364
1365static const struct qcom_pcie_cfg cfg_1_9_0 = {
1366 .ops = &ops_1_9_0,
1367};
1368
1369static const struct qcom_pcie_cfg cfg_2_1_0 = {
1370 .ops = &ops_2_1_0,
1371};
1372
1373static const struct qcom_pcie_cfg cfg_2_3_2 = {
1374 .ops = &ops_2_3_2,
1375};
1376
1377static const struct qcom_pcie_cfg cfg_2_3_3 = {
1378 .ops = &ops_2_3_3,
1379};
1380
1381static const struct qcom_pcie_cfg cfg_2_4_0 = {
1382 .ops = &ops_2_4_0,
1383};
1384
1385static const struct qcom_pcie_cfg cfg_2_7_0 = {
1386 .ops = &ops_2_7_0,
1387};
1388
1389static const struct qcom_pcie_cfg cfg_2_9_0 = {
1390 .ops = &ops_2_9_0,
1391};
1392
1393static const struct qcom_pcie_cfg cfg_sc8280xp = {
1394 .ops = &ops_1_9_0,
1395 .no_l0s = true,
1396};
1397
1398static const struct dw_pcie_ops dw_pcie_ops = {
1399 .link_up = qcom_pcie_link_up,
1400 .start_link = qcom_pcie_start_link,
1401};
1402
1403static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
1404{
1405 struct dw_pcie *pci = pcie->pci;
1406 int ret;
1407
1408 pcie->icc_mem = devm_of_icc_get(pci->dev, "pcie-mem");
1409 if (IS_ERR(pcie->icc_mem))
1410 return PTR_ERR(pcie->icc_mem);
1411
1412 /*
1413 * Some Qualcomm platforms require interconnect bandwidth constraints
1414 * to be set before enabling interconnect clocks.
1415 *
1416 * Set an initial peak bandwidth corresponding to single-lane Gen 1
1417 * for the pcie-mem path.
1418 */
1419 ret = icc_set_bw(pcie->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
1420 if (ret) {
1421 dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
1422 ret);
1423 return ret;
1424 }
1425
1426 return 0;
1427}
1428
1429static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
1430{
1431 struct dw_pcie *pci = pcie->pci;
1432 u32 offset, status;
1433 int speed, width;
1434 int ret;
1435
1436 if (!pcie->icc_mem)
1437 return;
1438
1439 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
1440 status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
1441
1442 /* Only update constraints if link is up. */
1443 if (!(status & PCI_EXP_LNKSTA_DLLLA))
1444 return;
1445
1446 speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
1447 width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
1448
1449 ret = icc_set_bw(pcie->icc_mem, 0, width * QCOM_PCIE_LINK_SPEED_TO_BW(speed));
1450 if (ret) {
1451 dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
1452 ret);
1453 }
1454}
1455
1456static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
1457{
1458 struct qcom_pcie *pcie = (struct qcom_pcie *)dev_get_drvdata(s->private);
1459
1460 seq_printf(s, "L0s transition count: %u\n",
1461 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S));
1462
1463 seq_printf(s, "L1 transition count: %u\n",
1464 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1));
1465
1466 seq_printf(s, "L1.1 transition count: %u\n",
1467 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1));
1468
1469 seq_printf(s, "L1.2 transition count: %u\n",
1470 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2));
1471
1472 seq_printf(s, "L2 transition count: %u\n",
1473 readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2));
1474
1475 return 0;
1476}
1477
1478static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie)
1479{
1480 struct dw_pcie *pci = pcie->pci;
1481 struct device *dev = pci->dev;
1482 char *name;
1483
1484 name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
1485 if (!name)
1486 return;
1487
1488 pcie->debugfs = debugfs_create_dir(name, NULL);
1489 debugfs_create_devm_seqfile(dev, "link_transition_count", pcie->debugfs,
1490 qcom_pcie_link_transition_count);
1491}
1492
1493static int qcom_pcie_probe(struct platform_device *pdev)
1494{
1495 const struct qcom_pcie_cfg *pcie_cfg;
1496 struct device *dev = &pdev->dev;
1497 struct qcom_pcie *pcie;
1498 struct dw_pcie_rp *pp;
1499 struct resource *res;
1500 struct dw_pcie *pci;
1501 int ret;
1502
1503 pcie_cfg = of_device_get_match_data(dev);
1504 if (!pcie_cfg || !pcie_cfg->ops) {
1505 dev_err(dev, "Invalid platform data\n");
1506 return -EINVAL;
1507 }
1508
1509 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1510 if (!pcie)
1511 return -ENOMEM;
1512
1513 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1514 if (!pci)
1515 return -ENOMEM;
1516
1517 pm_runtime_enable(dev);
1518 ret = pm_runtime_get_sync(dev);
1519 if (ret < 0)
1520 goto err_pm_runtime_put;
1521
1522 pci->dev = dev;
1523 pci->ops = &dw_pcie_ops;
1524 pp = &pci->pp;
1525
1526 pcie->pci = pci;
1527
1528 pcie->cfg = pcie_cfg;
1529
1530 pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
1531 if (IS_ERR(pcie->reset)) {
1532 ret = PTR_ERR(pcie->reset);
1533 goto err_pm_runtime_put;
1534 }
1535
1536 pcie->parf = devm_platform_ioremap_resource_byname(pdev, "parf");
1537 if (IS_ERR(pcie->parf)) {
1538 ret = PTR_ERR(pcie->parf);
1539 goto err_pm_runtime_put;
1540 }
1541
1542 pcie->elbi = devm_platform_ioremap_resource_byname(pdev, "elbi");
1543 if (IS_ERR(pcie->elbi)) {
1544 ret = PTR_ERR(pcie->elbi);
1545 goto err_pm_runtime_put;
1546 }
1547
1548 /* MHI region is optional */
1549 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mhi");
1550 if (res) {
1551 pcie->mhi = devm_ioremap_resource(dev, res);
1552 if (IS_ERR(pcie->mhi)) {
1553 ret = PTR_ERR(pcie->mhi);
1554 goto err_pm_runtime_put;
1555 }
1556 }
1557
1558 pcie->phy = devm_phy_optional_get(dev, "pciephy");
1559 if (IS_ERR(pcie->phy)) {
1560 ret = PTR_ERR(pcie->phy);
1561 goto err_pm_runtime_put;
1562 }
1563
1564 ret = qcom_pcie_icc_init(pcie);
1565 if (ret)
1566 goto err_pm_runtime_put;
1567
1568 ret = pcie->cfg->ops->get_resources(pcie);
1569 if (ret)
1570 goto err_pm_runtime_put;
1571
1572 pp->ops = &qcom_pcie_dw_ops;
1573
1574 ret = phy_init(pcie->phy);
1575 if (ret)
1576 goto err_pm_runtime_put;
1577
1578 platform_set_drvdata(pdev, pcie);
1579
1580 ret = dw_pcie_host_init(pp);
1581 if (ret) {
1582 dev_err(dev, "cannot initialize host\n");
1583 goto err_phy_exit;
1584 }
1585
1586 qcom_pcie_icc_update(pcie);
1587
1588 if (pcie->mhi)
1589 qcom_pcie_init_debugfs(pcie);
1590
1591 return 0;
1592
1593err_phy_exit:
1594 phy_exit(pcie->phy);
1595err_pm_runtime_put:
1596 pm_runtime_put(dev);
1597 pm_runtime_disable(dev);
1598
1599 return ret;
1600}
1601
1602static int qcom_pcie_suspend_noirq(struct device *dev)
1603{
1604 struct qcom_pcie *pcie = dev_get_drvdata(dev);
1605 int ret;
1606
1607 /*
1608 * Set minimum bandwidth required to keep data path functional during
1609 * suspend.
1610 */
1611 ret = icc_set_bw(pcie->icc_mem, 0, kBps_to_icc(1));
1612 if (ret) {
1613 dev_err(dev, "Failed to set interconnect bandwidth: %d\n", ret);
1614 return ret;
1615 }
1616
1617 /*
1618 * Turn OFF the resources only for controllers without active PCIe
1619 * devices. For controllers with active devices, the resources are kept
1620 * ON and the link is expected to be in L0/L1 (sub)states.
1621 *
1622 * Turning OFF the resources for controllers with active PCIe devices
1623 * will trigger access violation during the end of the suspend cycle,
1624 * as kernel tries to access the PCIe devices config space for masking
1625 * MSIs.
1626 *
1627 * Also, it is not desirable to put the link into L2/L3 state as that
1628 * implies VDD supply will be removed and the devices may go into
1629 * powerdown state. This will affect the lifetime of the storage devices
1630 * like NVMe.
1631 */
1632 if (!dw_pcie_link_up(pcie->pci)) {
1633 qcom_pcie_host_deinit(&pcie->pci->pp);
1634 pcie->suspended = true;
1635 }
1636
1637 return 0;
1638}
1639
1640static int qcom_pcie_resume_noirq(struct device *dev)
1641{
1642 struct qcom_pcie *pcie = dev_get_drvdata(dev);
1643 int ret;
1644
1645 if (pcie->suspended) {
1646 ret = qcom_pcie_host_init(&pcie->pci->pp);
1647 if (ret)
1648 return ret;
1649
1650 pcie->suspended = false;
1651 }
1652
1653 qcom_pcie_icc_update(pcie);
1654
1655 return 0;
1656}
1657
1658static const struct of_device_id qcom_pcie_match[] = {
1659 { .compatible = "qcom,pcie-apq8064", .data = &cfg_2_1_0 },
1660 { .compatible = "qcom,pcie-apq8084", .data = &cfg_1_0_0 },
1661 { .compatible = "qcom,pcie-ipq4019", .data = &cfg_2_4_0 },
1662 { .compatible = "qcom,pcie-ipq6018", .data = &cfg_2_9_0 },
1663 { .compatible = "qcom,pcie-ipq8064", .data = &cfg_2_1_0 },
1664 { .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
1665 { .compatible = "qcom,pcie-ipq8074", .data = &cfg_2_3_3 },
1666 { .compatible = "qcom,pcie-ipq8074-gen3", .data = &cfg_2_9_0 },
1667 { .compatible = "qcom,pcie-msm8996", .data = &cfg_2_3_2 },
1668 { .compatible = "qcom,pcie-qcs404", .data = &cfg_2_4_0 },
1669 { .compatible = "qcom,pcie-sa8540p", .data = &cfg_sc8280xp },
1670 { .compatible = "qcom,pcie-sa8775p", .data = &cfg_1_9_0},
1671 { .compatible = "qcom,pcie-sc7280", .data = &cfg_1_9_0 },
1672 { .compatible = "qcom,pcie-sc8180x", .data = &cfg_1_9_0 },
1673 { .compatible = "qcom,pcie-sc8280xp", .data = &cfg_sc8280xp },
1674 { .compatible = "qcom,pcie-sdm845", .data = &cfg_2_7_0 },
1675 { .compatible = "qcom,pcie-sdx55", .data = &cfg_1_9_0 },
1676 { .compatible = "qcom,pcie-sm8150", .data = &cfg_1_9_0 },
1677 { .compatible = "qcom,pcie-sm8250", .data = &cfg_1_9_0 },
1678 { .compatible = "qcom,pcie-sm8350", .data = &cfg_1_9_0 },
1679 { .compatible = "qcom,pcie-sm8450-pcie0", .data = &cfg_1_9_0 },
1680 { .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
1681 { .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
1682 { .compatible = "qcom,pcie-x1e80100", .data = &cfg_1_9_0 },
1683 { }
1684};
1685
1686static void qcom_fixup_class(struct pci_dev *dev)
1687{
1688 dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
1689}
1690DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
1691DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
1692DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0106, qcom_fixup_class);
1693DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0107, qcom_fixup_class);
1694DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0302, qcom_fixup_class);
1695DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1000, qcom_fixup_class);
1696DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1001, qcom_fixup_class);
1697
1698static const struct dev_pm_ops qcom_pcie_pm_ops = {
1699 NOIRQ_SYSTEM_SLEEP_PM_OPS(qcom_pcie_suspend_noirq, qcom_pcie_resume_noirq)
1700};
1701
1702static struct platform_driver qcom_pcie_driver = {
1703 .probe = qcom_pcie_probe,
1704 .driver = {
1705 .name = "qcom-pcie",
1706 .suppress_bind_attrs = true,
1707 .of_match_table = qcom_pcie_match,
1708 .pm = &qcom_pcie_pm_ops,
1709 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1710 },
1711};
1712builtin_platform_driver(qcom_pcie_driver);