1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe host controller driver for Kirin Phone SoCs
4 *
5 * Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
6 * https://www.huawei.com
7 *
8 * Author: Xiaowei Song <songxiaowei@huawei.com>
9 */
10
11#include <linux/clk.h>
12#include <linux/compiler.h>
13#include <linux/delay.h>
14#include <linux/err.h>
15#include <linux/gpio.h>
16#include <linux/gpio/consumer.h>
17#include <linux/interrupt.h>
18#include <linux/mfd/syscon.h>
19#include <linux/of.h>
20#include <linux/of_gpio.h>
21#include <linux/of_pci.h>
22#include <linux/phy/phy.h>
23#include <linux/pci.h>
24#include <linux/pci_regs.h>
25#include <linux/platform_device.h>
26#include <linux/regmap.h>
27#include <linux/resource.h>
28#include <linux/types.h>
29#include "pcie-designware.h"
30
31#define to_kirin_pcie(x) dev_get_drvdata((x)->dev)
32
33/* PCIe ELBI registers */
34#define SOC_PCIECTRL_CTRL0_ADDR 0x000
35#define SOC_PCIECTRL_CTRL1_ADDR 0x004
36#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21)
37
38/* info located in APB */
39#define PCIE_APP_LTSSM_ENABLE 0x01c
40#define PCIE_APB_PHY_STATUS0 0x400
41#define PCIE_LINKUP_ENABLE (0x8020)
42#define PCIE_LTSSM_ENABLE_BIT (0x1 << 11)
43
44/* info located in sysctrl */
45#define SCTRL_PCIE_CMOS_OFFSET 0x60
46#define SCTRL_PCIE_CMOS_BIT 0x10
47#define SCTRL_PCIE_ISO_OFFSET 0x44
48#define SCTRL_PCIE_ISO_BIT 0x30
49#define SCTRL_PCIE_HPCLK_OFFSET 0x190
50#define SCTRL_PCIE_HPCLK_BIT 0x184000
51#define SCTRL_PCIE_OE_OFFSET 0x14a
52#define PCIE_DEBOUNCE_PARAM 0xF0F400
53#define PCIE_OE_BYPASS (0x3 << 28)
54
55/*
56 * Max number of connected PCI slots at an external PCI bridge
57 *
58 * This is used on HiKey 970, which has a PEX 8606 bridge with 4 connected
59 * lanes (lane 0 upstream, and the other three lanes, one connected to an
60 * in-board Ethernet adapter and the other two connected to M.2 and mini
61 * PCI slots.
62 *
63 * Each slot has a different clock source and uses a separate PERST# pin.
64 */
65#define MAX_PCI_SLOTS 3
66
67enum pcie_kirin_phy_type {
68 PCIE_KIRIN_INTERNAL_PHY,
69 PCIE_KIRIN_EXTERNAL_PHY
70};
71
72struct kirin_pcie {
73 enum pcie_kirin_phy_type type;
74
75 struct dw_pcie *pci;
76 struct regmap *apb;
77 struct phy *phy;
78 void *phy_priv; /* only for PCIE_KIRIN_INTERNAL_PHY */
79
80 /* DWC PERST# */
81 int gpio_id_dwc_perst;
82
83 /* Per-slot PERST# */
84 int num_slots;
85 int gpio_id_reset[MAX_PCI_SLOTS];
86 const char *reset_names[MAX_PCI_SLOTS];
87
88 /* Per-slot clkreq */
89 int n_gpio_clkreq;
90 int gpio_id_clkreq[MAX_PCI_SLOTS];
91 const char *clkreq_names[MAX_PCI_SLOTS];
92};
93
94/*
95 * Kirin 960 PHY. Can't be split into a PHY driver without changing the
96 * DT schema.
97 */
98
99#define REF_CLK_FREQ 100000000
100
101/* PHY info located in APB */
102#define PCIE_APB_PHY_CTRL0 0x0
103#define PCIE_APB_PHY_CTRL1 0x4
104#define PCIE_APB_PHY_STATUS0 0x400
105#define PIPE_CLK_STABLE BIT(19)
106#define PHY_REF_PAD_BIT BIT(8)
107#define PHY_PWR_DOWN_BIT BIT(22)
108#define PHY_RST_ACK_BIT BIT(16)
109
110/* peri_crg ctrl */
111#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
112#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
113
114/* Time for delay */
115#define REF_2_PERST_MIN 21000
116#define REF_2_PERST_MAX 25000
117#define PERST_2_ACCESS_MIN 10000
118#define PERST_2_ACCESS_MAX 12000
119#define PIPE_CLK_WAIT_MIN 550
120#define PIPE_CLK_WAIT_MAX 600
121#define TIME_CMOS_MIN 100
122#define TIME_CMOS_MAX 105
123#define TIME_PHY_PD_MIN 10
124#define TIME_PHY_PD_MAX 11
125
126struct hi3660_pcie_phy {
127 struct device *dev;
128 void __iomem *base;
129 struct regmap *crgctrl;
130 struct regmap *sysctrl;
131 struct clk *apb_sys_clk;
132 struct clk *apb_phy_clk;
133 struct clk *phy_ref_clk;
134 struct clk *aclk;
135 struct clk *aux_clk;
136};
137
138/* Registers in PCIePHY */
139static inline void kirin_apb_phy_writel(struct hi3660_pcie_phy *hi3660_pcie_phy,
140 u32 val, u32 reg)
141{
142 writel(val, addr: hi3660_pcie_phy->base + reg);
143}
144
145static inline u32 kirin_apb_phy_readl(struct hi3660_pcie_phy *hi3660_pcie_phy,
146 u32 reg)
147{
148 return readl(addr: hi3660_pcie_phy->base + reg);
149}
150
151static int hi3660_pcie_phy_get_clk(struct hi3660_pcie_phy *phy)
152{
153 struct device *dev = phy->dev;
154
155 phy->phy_ref_clk = devm_clk_get(dev, id: "pcie_phy_ref");
156 if (IS_ERR(ptr: phy->phy_ref_clk))
157 return PTR_ERR(ptr: phy->phy_ref_clk);
158
159 phy->aux_clk = devm_clk_get(dev, id: "pcie_aux");
160 if (IS_ERR(ptr: phy->aux_clk))
161 return PTR_ERR(ptr: phy->aux_clk);
162
163 phy->apb_phy_clk = devm_clk_get(dev, id: "pcie_apb_phy");
164 if (IS_ERR(ptr: phy->apb_phy_clk))
165 return PTR_ERR(ptr: phy->apb_phy_clk);
166
167 phy->apb_sys_clk = devm_clk_get(dev, id: "pcie_apb_sys");
168 if (IS_ERR(ptr: phy->apb_sys_clk))
169 return PTR_ERR(ptr: phy->apb_sys_clk);
170
171 phy->aclk = devm_clk_get(dev, id: "pcie_aclk");
172 if (IS_ERR(ptr: phy->aclk))
173 return PTR_ERR(ptr: phy->aclk);
174
175 return 0;
176}
177
178static int hi3660_pcie_phy_get_resource(struct hi3660_pcie_phy *phy)
179{
180 struct device *dev = phy->dev;
181 struct platform_device *pdev;
182
183 /* registers */
184 pdev = container_of(dev, struct platform_device, dev);
185
186 phy->base = devm_platform_ioremap_resource_byname(pdev, name: "phy");
187 if (IS_ERR(ptr: phy->base))
188 return PTR_ERR(ptr: phy->base);
189
190 phy->crgctrl = syscon_regmap_lookup_by_compatible(s: "hisilicon,hi3660-crgctrl");
191 if (IS_ERR(ptr: phy->crgctrl))
192 return PTR_ERR(ptr: phy->crgctrl);
193
194 phy->sysctrl = syscon_regmap_lookup_by_compatible(s: "hisilicon,hi3660-sctrl");
195 if (IS_ERR(ptr: phy->sysctrl))
196 return PTR_ERR(ptr: phy->sysctrl);
197
198 return 0;
199}
200
201static int hi3660_pcie_phy_start(struct hi3660_pcie_phy *phy)
202{
203 struct device *dev = phy->dev;
204 u32 reg_val;
205
206 reg_val = kirin_apb_phy_readl(hi3660_pcie_phy: phy, PCIE_APB_PHY_CTRL1);
207 reg_val &= ~PHY_REF_PAD_BIT;
208 kirin_apb_phy_writel(hi3660_pcie_phy: phy, val: reg_val, PCIE_APB_PHY_CTRL1);
209
210 reg_val = kirin_apb_phy_readl(hi3660_pcie_phy: phy, PCIE_APB_PHY_CTRL0);
211 reg_val &= ~PHY_PWR_DOWN_BIT;
212 kirin_apb_phy_writel(hi3660_pcie_phy: phy, val: reg_val, PCIE_APB_PHY_CTRL0);
213 usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX);
214
215 reg_val = kirin_apb_phy_readl(hi3660_pcie_phy: phy, PCIE_APB_PHY_CTRL1);
216 reg_val &= ~PHY_RST_ACK_BIT;
217 kirin_apb_phy_writel(hi3660_pcie_phy: phy, val: reg_val, PCIE_APB_PHY_CTRL1);
218
219 usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX);
220 reg_val = kirin_apb_phy_readl(hi3660_pcie_phy: phy, PCIE_APB_PHY_STATUS0);
221 if (reg_val & PIPE_CLK_STABLE) {
222 dev_err(dev, "PIPE clk is not stable\n");
223 return -EINVAL;
224 }
225
226 return 0;
227}
228
229static void hi3660_pcie_phy_oe_enable(struct hi3660_pcie_phy *phy)
230{
231 u32 val;
232
233 regmap_read(map: phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val: &val);
234 val |= PCIE_DEBOUNCE_PARAM;
235 val &= ~PCIE_OE_BYPASS;
236 regmap_write(map: phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
237}
238
239static int hi3660_pcie_phy_clk_ctrl(struct hi3660_pcie_phy *phy, bool enable)
240{
241 int ret = 0;
242
243 if (!enable)
244 goto close_clk;
245
246 ret = clk_set_rate(clk: phy->phy_ref_clk, REF_CLK_FREQ);
247 if (ret)
248 return ret;
249
250 ret = clk_prepare_enable(clk: phy->phy_ref_clk);
251 if (ret)
252 return ret;
253
254 ret = clk_prepare_enable(clk: phy->apb_sys_clk);
255 if (ret)
256 goto apb_sys_fail;
257
258 ret = clk_prepare_enable(clk: phy->apb_phy_clk);
259 if (ret)
260 goto apb_phy_fail;
261
262 ret = clk_prepare_enable(clk: phy->aclk);
263 if (ret)
264 goto aclk_fail;
265
266 ret = clk_prepare_enable(clk: phy->aux_clk);
267 if (ret)
268 goto aux_clk_fail;
269
270 return 0;
271
272close_clk:
273 clk_disable_unprepare(clk: phy->aux_clk);
274aux_clk_fail:
275 clk_disable_unprepare(clk: phy->aclk);
276aclk_fail:
277 clk_disable_unprepare(clk: phy->apb_phy_clk);
278apb_phy_fail:
279 clk_disable_unprepare(clk: phy->apb_sys_clk);
280apb_sys_fail:
281 clk_disable_unprepare(clk: phy->phy_ref_clk);
282
283 return ret;
284}
285
286static int hi3660_pcie_phy_power_on(struct kirin_pcie *pcie)
287{
288 struct hi3660_pcie_phy *phy = pcie->phy_priv;
289 int ret;
290
291 /* Power supply for Host */
292 regmap_write(map: phy->sysctrl,
293 SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
294 usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
295
296 hi3660_pcie_phy_oe_enable(phy);
297
298 ret = hi3660_pcie_phy_clk_ctrl(phy, enable: true);
299 if (ret)
300 return ret;
301
302 /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
303 regmap_write(map: phy->sysctrl,
304 SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
305 regmap_write(map: phy->crgctrl,
306 CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT);
307 regmap_write(map: phy->sysctrl,
308 SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT);
309
310 ret = hi3660_pcie_phy_start(phy);
311 if (ret)
312 goto disable_clks;
313
314 return 0;
315
316disable_clks:
317 hi3660_pcie_phy_clk_ctrl(phy, enable: false);
318 return ret;
319}
320
321static int hi3660_pcie_phy_init(struct platform_device *pdev,
322 struct kirin_pcie *pcie)
323{
324 struct device *dev = &pdev->dev;
325 struct hi3660_pcie_phy *phy;
326 int ret;
327
328 phy = devm_kzalloc(dev, size: sizeof(*phy), GFP_KERNEL);
329 if (!phy)
330 return -ENOMEM;
331
332 pcie->phy_priv = phy;
333 phy->dev = dev;
334
335 ret = hi3660_pcie_phy_get_clk(phy);
336 if (ret)
337 return ret;
338
339 return hi3660_pcie_phy_get_resource(phy);
340}
341
342static int hi3660_pcie_phy_power_off(struct kirin_pcie *pcie)
343{
344 struct hi3660_pcie_phy *phy = pcie->phy_priv;
345
346 /* Drop power supply for Host */
347 regmap_write(map: phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, val: 0x00);
348
349 hi3660_pcie_phy_clk_ctrl(phy, enable: false);
350
351 return 0;
352}
353
354/*
355 * The non-PHY part starts here
356 */
357
358static const struct regmap_config pcie_kirin_regmap_conf = {
359 .name = "kirin_pcie_apb",
360 .reg_bits = 32,
361 .val_bits = 32,
362 .reg_stride = 4,
363};
364
365static int kirin_pcie_get_gpio_enable(struct kirin_pcie *pcie,
366 struct platform_device *pdev)
367{
368 struct device *dev = &pdev->dev;
369 int ret, i;
370
371 /* This is an optional property */
372 ret = gpiod_count(dev, con_id: "hisilicon,clken");
373 if (ret < 0)
374 return 0;
375
376 if (ret > MAX_PCI_SLOTS) {
377 dev_err(dev, "Too many GPIO clock requests!\n");
378 return -EINVAL;
379 }
380
381 pcie->n_gpio_clkreq = ret;
382
383 for (i = 0; i < pcie->n_gpio_clkreq; i++) {
384 pcie->gpio_id_clkreq[i] = of_get_named_gpio(np: dev->of_node,
385 list_name: "hisilicon,clken-gpios", index: i);
386 if (pcie->gpio_id_clkreq[i] < 0)
387 return pcie->gpio_id_clkreq[i];
388
389 pcie->clkreq_names[i] = devm_kasprintf(dev, GFP_KERNEL,
390 fmt: "pcie_clkreq_%d", i);
391 if (!pcie->clkreq_names[i])
392 return -ENOMEM;
393 }
394
395 return 0;
396}
397
398static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
399 struct platform_device *pdev,
400 struct device_node *node)
401{
402 struct device *dev = &pdev->dev;
403 struct device_node *parent, *child;
404 int ret, slot, i;
405
406 for_each_available_child_of_node(node, parent) {
407 for_each_available_child_of_node(parent, child) {
408 i = pcie->num_slots;
409
410 pcie->gpio_id_reset[i] = of_get_named_gpio(np: child,
411 list_name: "reset-gpios", index: 0);
412 if (pcie->gpio_id_reset[i] < 0)
413 continue;
414
415 pcie->num_slots++;
416 if (pcie->num_slots > MAX_PCI_SLOTS) {
417 dev_err(dev, "Too many PCI slots!\n");
418 ret = -EINVAL;
419 goto put_node;
420 }
421
422 ret = of_pci_get_devfn(np: child);
423 if (ret < 0) {
424 dev_err(dev, "failed to parse devfn: %d\n", ret);
425 goto put_node;
426 }
427
428 slot = PCI_SLOT(ret);
429
430 pcie->reset_names[i] = devm_kasprintf(dev, GFP_KERNEL,
431 fmt: "pcie_perst_%d",
432 slot);
433 if (!pcie->reset_names[i]) {
434 ret = -ENOMEM;
435 goto put_node;
436 }
437 }
438 }
439
440 return 0;
441
442put_node:
443 of_node_put(node: child);
444 of_node_put(node: parent);
445 return ret;
446}
447
448static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
449 struct platform_device *pdev)
450{
451 struct device *dev = &pdev->dev;
452 struct device_node *child, *node = dev->of_node;
453 void __iomem *apb_base;
454 int ret;
455
456 apb_base = devm_platform_ioremap_resource_byname(pdev, name: "apb");
457 if (IS_ERR(ptr: apb_base))
458 return PTR_ERR(ptr: apb_base);
459
460 kirin_pcie->apb = devm_regmap_init_mmio(dev, apb_base,
461 &pcie_kirin_regmap_conf);
462 if (IS_ERR(ptr: kirin_pcie->apb))
463 return PTR_ERR(ptr: kirin_pcie->apb);
464
465 /* pcie internal PERST# gpio */
466 kirin_pcie->gpio_id_dwc_perst = of_get_named_gpio(np: dev->of_node,
467 list_name: "reset-gpios", index: 0);
468 if (kirin_pcie->gpio_id_dwc_perst == -EPROBE_DEFER) {
469 return -EPROBE_DEFER;
470 } else if (!gpio_is_valid(number: kirin_pcie->gpio_id_dwc_perst)) {
471 dev_err(dev, "unable to get a valid gpio pin\n");
472 return -ENODEV;
473 }
474
475 ret = kirin_pcie_get_gpio_enable(pcie: kirin_pcie, pdev);
476 if (ret)
477 return ret;
478
479 /* Parse OF children */
480 for_each_available_child_of_node(node, child) {
481 ret = kirin_pcie_parse_port(pcie: kirin_pcie, pdev, node: child);
482 if (ret)
483 goto put_node;
484 }
485
486 return 0;
487
488put_node:
489 of_node_put(node: child);
490 return ret;
491}
492
493static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie,
494 bool on)
495{
496 u32 val;
497
498 regmap_read(map: kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, val: &val);
499 if (on)
500 val = val | PCIE_ELBI_SLV_DBI_ENABLE;
501 else
502 val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
503
504 regmap_write(map: kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, val);
505}
506
507static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie,
508 bool on)
509{
510 u32 val;
511
512 regmap_read(map: kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, val: &val);
513 if (on)
514 val = val | PCIE_ELBI_SLV_DBI_ENABLE;
515 else
516 val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
517
518 regmap_write(map: kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, val);
519}
520
521static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
522 int where, int size, u32 *val)
523{
524 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
525
526 if (PCI_SLOT(devfn))
527 return PCIBIOS_DEVICE_NOT_FOUND;
528
529 *val = dw_pcie_read_dbi(pci, reg: where, size);
530 return PCIBIOS_SUCCESSFUL;
531}
532
533static int kirin_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn,
534 int where, int size, u32 val)
535{
536 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
537
538 if (PCI_SLOT(devfn))
539 return PCIBIOS_DEVICE_NOT_FOUND;
540
541 dw_pcie_write_dbi(pci, reg: where, size, val);
542 return PCIBIOS_SUCCESSFUL;
543}
544
545static int kirin_pcie_add_bus(struct pci_bus *bus)
546{
547 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
548 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
549 int i, ret;
550
551 if (!kirin_pcie->num_slots)
552 return 0;
553
554 /* Send PERST# to each slot */
555 for (i = 0; i < kirin_pcie->num_slots; i++) {
556 ret = gpio_direction_output(gpio: kirin_pcie->gpio_id_reset[i], value: 1);
557 if (ret) {
558 dev_err(pci->dev, "PERST# %s error: %d\n",
559 kirin_pcie->reset_names[i], ret);
560 }
561 }
562 usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
563
564 return 0;
565}
566
567static struct pci_ops kirin_pci_ops = {
568 .read = kirin_pcie_rd_own_conf,
569 .write = kirin_pcie_wr_own_conf,
570 .add_bus = kirin_pcie_add_bus,
571};
572
573static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
574 u32 reg, size_t size)
575{
576 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
577 u32 ret;
578
579 kirin_pcie_sideband_dbi_r_mode(kirin_pcie, on: true);
580 dw_pcie_read(addr: base + reg, size, val: &ret);
581 kirin_pcie_sideband_dbi_r_mode(kirin_pcie, on: false);
582
583 return ret;
584}
585
586static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
587 u32 reg, size_t size, u32 val)
588{
589 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
590
591 kirin_pcie_sideband_dbi_w_mode(kirin_pcie, on: true);
592 dw_pcie_write(addr: base + reg, size, val);
593 kirin_pcie_sideband_dbi_w_mode(kirin_pcie, on: false);
594}
595
596static int kirin_pcie_link_up(struct dw_pcie *pci)
597{
598 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
599 u32 val;
600
601 regmap_read(map: kirin_pcie->apb, PCIE_APB_PHY_STATUS0, val: &val);
602 if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE)
603 return 1;
604
605 return 0;
606}
607
608static int kirin_pcie_start_link(struct dw_pcie *pci)
609{
610 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
611
612 /* assert LTSSM enable */
613 regmap_write(map: kirin_pcie->apb, PCIE_APP_LTSSM_ENABLE,
614 PCIE_LTSSM_ENABLE_BIT);
615
616 return 0;
617}
618
619static int kirin_pcie_host_init(struct dw_pcie_rp *pp)
620{
621 pp->bridge->ops = &kirin_pci_ops;
622
623 return 0;
624}
625
626static int kirin_pcie_gpio_request(struct kirin_pcie *kirin_pcie,
627 struct device *dev)
628{
629 int ret, i;
630
631 for (i = 0; i < kirin_pcie->num_slots; i++) {
632 if (!gpio_is_valid(number: kirin_pcie->gpio_id_reset[i])) {
633 dev_err(dev, "unable to get a valid %s gpio\n",
634 kirin_pcie->reset_names[i]);
635 return -ENODEV;
636 }
637
638 ret = devm_gpio_request(dev, gpio: kirin_pcie->gpio_id_reset[i],
639 label: kirin_pcie->reset_names[i]);
640 if (ret)
641 return ret;
642 }
643
644 for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) {
645 if (!gpio_is_valid(number: kirin_pcie->gpio_id_clkreq[i])) {
646 dev_err(dev, "unable to get a valid %s gpio\n",
647 kirin_pcie->clkreq_names[i]);
648 return -ENODEV;
649 }
650
651 ret = devm_gpio_request(dev, gpio: kirin_pcie->gpio_id_clkreq[i],
652 label: kirin_pcie->clkreq_names[i]);
653 if (ret)
654 return ret;
655
656 ret = gpio_direction_output(gpio: kirin_pcie->gpio_id_clkreq[i], value: 0);
657 if (ret)
658 return ret;
659 }
660
661 return 0;
662}
663
664static const struct dw_pcie_ops kirin_dw_pcie_ops = {
665 .read_dbi = kirin_pcie_read_dbi,
666 .write_dbi = kirin_pcie_write_dbi,
667 .link_up = kirin_pcie_link_up,
668 .start_link = kirin_pcie_start_link,
669};
670
671static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
672 .init = kirin_pcie_host_init,
673};
674
675static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie)
676{
677 int i;
678
679 if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
680 return hi3660_pcie_phy_power_off(pcie: kirin_pcie);
681
682 for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++)
683 gpio_direction_output(gpio: kirin_pcie->gpio_id_clkreq[i], value: 1);
684
685 phy_power_off(phy: kirin_pcie->phy);
686 phy_exit(phy: kirin_pcie->phy);
687
688 return 0;
689}
690
691static int kirin_pcie_power_on(struct platform_device *pdev,
692 struct kirin_pcie *kirin_pcie)
693{
694 struct device *dev = &pdev->dev;
695 int ret;
696
697 if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) {
698 ret = hi3660_pcie_phy_init(pdev, pcie: kirin_pcie);
699 if (ret)
700 return ret;
701
702 ret = hi3660_pcie_phy_power_on(pcie: kirin_pcie);
703 if (ret)
704 return ret;
705 } else {
706 kirin_pcie->phy = devm_of_phy_get(dev, np: dev->of_node, NULL);
707 if (IS_ERR(ptr: kirin_pcie->phy))
708 return PTR_ERR(ptr: kirin_pcie->phy);
709
710 ret = kirin_pcie_gpio_request(kirin_pcie, dev);
711 if (ret)
712 return ret;
713
714 ret = phy_init(phy: kirin_pcie->phy);
715 if (ret)
716 goto err;
717
718 ret = phy_power_on(phy: kirin_pcie->phy);
719 if (ret)
720 goto err;
721 }
722
723 /* perst assert Endpoint */
724 usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX);
725
726 if (!gpio_request(gpio: kirin_pcie->gpio_id_dwc_perst, label: "pcie_perst_bridge")) {
727 ret = gpio_direction_output(gpio: kirin_pcie->gpio_id_dwc_perst, value: 1);
728 if (ret)
729 goto err;
730 }
731
732 usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
733
734 return 0;
735err:
736 kirin_pcie_power_off(kirin_pcie);
737
738 return ret;
739}
740
741static void kirin_pcie_remove(struct platform_device *pdev)
742{
743 struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
744
745 dw_pcie_host_deinit(pp: &kirin_pcie->pci->pp);
746
747 kirin_pcie_power_off(kirin_pcie);
748}
749
750struct kirin_pcie_data {
751 enum pcie_kirin_phy_type phy_type;
752};
753
754static const struct kirin_pcie_data kirin_960_data = {
755 .phy_type = PCIE_KIRIN_INTERNAL_PHY,
756};
757
758static const struct kirin_pcie_data kirin_970_data = {
759 .phy_type = PCIE_KIRIN_EXTERNAL_PHY,
760};
761
762static const struct of_device_id kirin_pcie_match[] = {
763 { .compatible = "hisilicon,kirin960-pcie", .data = &kirin_960_data },
764 { .compatible = "hisilicon,kirin970-pcie", .data = &kirin_970_data },
765 {},
766};
767
768static int kirin_pcie_probe(struct platform_device *pdev)
769{
770 struct device *dev = &pdev->dev;
771 const struct kirin_pcie_data *data;
772 struct kirin_pcie *kirin_pcie;
773 struct dw_pcie *pci;
774 int ret;
775
776 if (!dev->of_node) {
777 dev_err(dev, "NULL node\n");
778 return -EINVAL;
779 }
780
781 data = of_device_get_match_data(dev);
782 if (!data) {
783 dev_err(dev, "OF data missing\n");
784 return -EINVAL;
785 }
786
787 kirin_pcie = devm_kzalloc(dev, size: sizeof(struct kirin_pcie), GFP_KERNEL);
788 if (!kirin_pcie)
789 return -ENOMEM;
790
791 pci = devm_kzalloc(dev, size: sizeof(*pci), GFP_KERNEL);
792 if (!pci)
793 return -ENOMEM;
794
795 pci->dev = dev;
796 pci->ops = &kirin_dw_pcie_ops;
797 pci->pp.ops = &kirin_pcie_host_ops;
798 kirin_pcie->pci = pci;
799 kirin_pcie->type = data->phy_type;
800
801 ret = kirin_pcie_get_resource(kirin_pcie, pdev);
802 if (ret)
803 return ret;
804
805 platform_set_drvdata(pdev, data: kirin_pcie);
806
807 ret = kirin_pcie_power_on(pdev, kirin_pcie);
808 if (ret)
809 return ret;
810
811 return dw_pcie_host_init(pp: &pci->pp);
812}
813
814static struct platform_driver kirin_pcie_driver = {
815 .probe = kirin_pcie_probe,
816 .remove_new = kirin_pcie_remove,
817 .driver = {
818 .name = "kirin-pcie",
819 .of_match_table = kirin_pcie_match,
820 .suppress_bind_attrs = true,
821 },
822};
823module_platform_driver(kirin_pcie_driver);
824
825MODULE_DEVICE_TABLE(of, kirin_pcie_match);
826MODULE_DESCRIPTION("PCIe host controller driver for Kirin Phone SoCs");
827MODULE_AUTHOR("Xiaowei Song <songxiaowei@huawei.com>");
828MODULE_LICENSE("GPL v2");
829

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source code of linux/drivers/pci/controller/dwc/pcie-kirin.c