staging: rtl8188eu: rename HalSetBrateCfg() - style
[linux/fpc-iii.git] / drivers / pci / controller / dwc / pcie-artpec6.c
blobdba83abfe7649ccfa2ffd7675f500fb646ed7129
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * PCIe host controller driver for Axis ARTPEC-6 SoC
5 * Author: Niklas Cassel <niklas.cassel@axis.com>
7 * Based on work done by Phil Edworthy <phil@edworthys.org>
8 */
10 #include <linux/delay.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/of_device.h>
14 #include <linux/pci.h>
15 #include <linux/platform_device.h>
16 #include <linux/resource.h>
17 #include <linux/signal.h>
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/regmap.h>
23 #include "pcie-designware.h"
25 #define to_artpec6_pcie(x) dev_get_drvdata((x)->dev)
27 enum artpec_pcie_variants {
28 ARTPEC6,
29 ARTPEC7,
32 struct artpec6_pcie {
33 struct dw_pcie *pci;
34 struct regmap *regmap; /* DT axis,syscon-pcie */
35 void __iomem *phy_base; /* DT phy */
36 enum artpec_pcie_variants variant;
37 enum dw_pcie_device_mode mode;
40 struct artpec_pcie_of_data {
41 enum artpec_pcie_variants variant;
42 enum dw_pcie_device_mode mode;
45 static const struct of_device_id artpec6_pcie_of_match[];
47 /* PCIe Port Logic registers (memory-mapped) */
48 #define PL_OFFSET 0x700
50 #define ACK_F_ASPM_CTRL_OFF (PL_OFFSET + 0xc)
51 #define ACK_N_FTS_MASK GENMASK(15, 8)
52 #define ACK_N_FTS(x) (((x) << 8) & ACK_N_FTS_MASK)
54 #define FAST_TRAINING_SEQ_MASK GENMASK(7, 0)
55 #define FAST_TRAINING_SEQ(x) (((x) << 0) & FAST_TRAINING_SEQ_MASK)
57 /* ARTPEC-6 specific registers */
58 #define PCIECFG 0x18
59 #define PCIECFG_DBG_OEN BIT(24)
60 #define PCIECFG_CORE_RESET_REQ BIT(21)
61 #define PCIECFG_LTSSM_ENABLE BIT(20)
62 #define PCIECFG_DEVICE_TYPE_MASK GENMASK(19, 16)
63 #define PCIECFG_CLKREQ_B BIT(11)
64 #define PCIECFG_REFCLK_ENABLE BIT(10)
65 #define PCIECFG_PLL_ENABLE BIT(9)
66 #define PCIECFG_PCLK_ENABLE BIT(8)
67 #define PCIECFG_RISRCREN BIT(4)
68 #define PCIECFG_MODE_TX_DRV_EN BIT(3)
69 #define PCIECFG_CISRREN BIT(2)
70 #define PCIECFG_MACRO_ENABLE BIT(0)
71 /* ARTPEC-7 specific fields */
72 #define PCIECFG_REFCLKSEL BIT(23)
73 #define PCIECFG_NOC_RESET BIT(3)
75 #define PCIESTAT 0x1c
76 /* ARTPEC-7 specific fields */
77 #define PCIESTAT_EXTREFCLK BIT(3)
79 #define NOCCFG 0x40
80 #define NOCCFG_ENABLE_CLK_PCIE BIT(4)
81 #define NOCCFG_POWER_PCIE_IDLEACK BIT(3)
82 #define NOCCFG_POWER_PCIE_IDLE BIT(2)
83 #define NOCCFG_POWER_PCIE_IDLEREQ BIT(1)
85 #define PHY_STATUS 0x118
86 #define PHY_COSPLLLOCK BIT(0)
88 #define PHY_TX_ASIC_OUT 0x4040
89 #define PHY_TX_ASIC_OUT_TX_ACK BIT(0)
91 #define PHY_RX_ASIC_OUT 0x405c
92 #define PHY_RX_ASIC_OUT_ACK BIT(0)
94 static u32 artpec6_pcie_readl(struct artpec6_pcie *artpec6_pcie, u32 offset)
96 u32 val;
98 regmap_read(artpec6_pcie->regmap, offset, &val);
99 return val;
102 static void artpec6_pcie_writel(struct artpec6_pcie *artpec6_pcie, u32 offset, u32 val)
104 regmap_write(artpec6_pcie->regmap, offset, val);
107 static u64 artpec6_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
109 struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
110 struct pcie_port *pp = &pci->pp;
111 struct dw_pcie_ep *ep = &pci->ep;
113 switch (artpec6_pcie->mode) {
114 case DW_PCIE_RC_TYPE:
115 return pci_addr - pp->cfg0_base;
116 case DW_PCIE_EP_TYPE:
117 return pci_addr - ep->phys_base;
118 default:
119 dev_err(pci->dev, "UNKNOWN device type\n");
121 return pci_addr;
124 static int artpec6_pcie_establish_link(struct dw_pcie *pci)
126 struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
127 u32 val;
129 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
130 val |= PCIECFG_LTSSM_ENABLE;
131 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
133 return 0;
136 static void artpec6_pcie_stop_link(struct dw_pcie *pci)
138 struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
139 u32 val;
141 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
142 val &= ~PCIECFG_LTSSM_ENABLE;
143 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
146 static const struct dw_pcie_ops dw_pcie_ops = {
147 .cpu_addr_fixup = artpec6_pcie_cpu_addr_fixup,
148 .start_link = artpec6_pcie_establish_link,
149 .stop_link = artpec6_pcie_stop_link,
152 static void artpec6_pcie_wait_for_phy_a6(struct artpec6_pcie *artpec6_pcie)
154 struct dw_pcie *pci = artpec6_pcie->pci;
155 struct device *dev = pci->dev;
156 u32 val;
157 unsigned int retries;
159 retries = 50;
160 do {
161 usleep_range(1000, 2000);
162 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
163 retries--;
164 } while (retries &&
165 (val & (NOCCFG_POWER_PCIE_IDLEACK | NOCCFG_POWER_PCIE_IDLE)));
166 if (!retries)
167 dev_err(dev, "PCIe clock manager did not leave idle state\n");
169 retries = 50;
170 do {
171 usleep_range(1000, 2000);
172 val = readl(artpec6_pcie->phy_base + PHY_STATUS);
173 retries--;
174 } while (retries && !(val & PHY_COSPLLLOCK));
175 if (!retries)
176 dev_err(dev, "PHY PLL did not lock\n");
179 static void artpec6_pcie_wait_for_phy_a7(struct artpec6_pcie *artpec6_pcie)
181 struct dw_pcie *pci = artpec6_pcie->pci;
182 struct device *dev = pci->dev;
183 u32 val;
184 u16 phy_status_tx, phy_status_rx;
185 unsigned int retries;
187 retries = 50;
188 do {
189 usleep_range(1000, 2000);
190 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
191 retries--;
192 } while (retries &&
193 (val & (NOCCFG_POWER_PCIE_IDLEACK | NOCCFG_POWER_PCIE_IDLE)));
194 if (!retries)
195 dev_err(dev, "PCIe clock manager did not leave idle state\n");
197 retries = 50;
198 do {
199 usleep_range(1000, 2000);
200 phy_status_tx = readw(artpec6_pcie->phy_base + PHY_TX_ASIC_OUT);
201 phy_status_rx = readw(artpec6_pcie->phy_base + PHY_RX_ASIC_OUT);
202 retries--;
203 } while (retries && ((phy_status_tx & PHY_TX_ASIC_OUT_TX_ACK) ||
204 (phy_status_rx & PHY_RX_ASIC_OUT_ACK)));
205 if (!retries)
206 dev_err(dev, "PHY did not enter Pn state\n");
209 static void artpec6_pcie_wait_for_phy(struct artpec6_pcie *artpec6_pcie)
211 switch (artpec6_pcie->variant) {
212 case ARTPEC6:
213 artpec6_pcie_wait_for_phy_a6(artpec6_pcie);
214 break;
215 case ARTPEC7:
216 artpec6_pcie_wait_for_phy_a7(artpec6_pcie);
217 break;
221 static void artpec6_pcie_init_phy_a6(struct artpec6_pcie *artpec6_pcie)
223 u32 val;
225 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
226 val |= PCIECFG_RISRCREN | /* Receiver term. 50 Ohm */
227 PCIECFG_MODE_TX_DRV_EN |
228 PCIECFG_CISRREN | /* Reference clock term. 100 Ohm */
229 PCIECFG_MACRO_ENABLE;
230 val |= PCIECFG_REFCLK_ENABLE;
231 val &= ~PCIECFG_DBG_OEN;
232 val &= ~PCIECFG_CLKREQ_B;
233 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
234 usleep_range(5000, 6000);
236 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
237 val |= NOCCFG_ENABLE_CLK_PCIE;
238 artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
239 usleep_range(20, 30);
241 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
242 val |= PCIECFG_PCLK_ENABLE | PCIECFG_PLL_ENABLE;
243 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
244 usleep_range(6000, 7000);
246 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
247 val &= ~NOCCFG_POWER_PCIE_IDLEREQ;
248 artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
251 static void artpec6_pcie_init_phy_a7(struct artpec6_pcie *artpec6_pcie)
253 struct dw_pcie *pci = artpec6_pcie->pci;
254 u32 val;
255 bool extrefclk;
257 /* Check if external reference clock is connected */
258 val = artpec6_pcie_readl(artpec6_pcie, PCIESTAT);
259 extrefclk = !!(val & PCIESTAT_EXTREFCLK);
260 dev_dbg(pci->dev, "Using reference clock: %s\n",
261 extrefclk ? "external" : "internal");
263 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
264 val |= PCIECFG_RISRCREN | /* Receiver term. 50 Ohm */
265 PCIECFG_PCLK_ENABLE;
266 if (extrefclk)
267 val |= PCIECFG_REFCLKSEL;
268 else
269 val &= ~PCIECFG_REFCLKSEL;
270 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
271 usleep_range(10, 20);
273 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
274 val |= NOCCFG_ENABLE_CLK_PCIE;
275 artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
276 usleep_range(20, 30);
278 val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
279 val &= ~NOCCFG_POWER_PCIE_IDLEREQ;
280 artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
283 static void artpec6_pcie_init_phy(struct artpec6_pcie *artpec6_pcie)
285 switch (artpec6_pcie->variant) {
286 case ARTPEC6:
287 artpec6_pcie_init_phy_a6(artpec6_pcie);
288 break;
289 case ARTPEC7:
290 artpec6_pcie_init_phy_a7(artpec6_pcie);
291 break;
295 static void artpec6_pcie_set_nfts(struct artpec6_pcie *artpec6_pcie)
297 struct dw_pcie *pci = artpec6_pcie->pci;
298 u32 val;
300 if (artpec6_pcie->variant != ARTPEC7)
301 return;
304 * Increase the N_FTS (Number of Fast Training Sequences)
305 * to be transmitted when transitioning from L0s to L0.
307 val = dw_pcie_readl_dbi(pci, ACK_F_ASPM_CTRL_OFF);
308 val &= ~ACK_N_FTS_MASK;
309 val |= ACK_N_FTS(180);
310 dw_pcie_writel_dbi(pci, ACK_F_ASPM_CTRL_OFF, val);
313 * Set the Number of Fast Training Sequences that the core
314 * advertises as its N_FTS during Gen2 or Gen3 link training.
316 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
317 val &= ~FAST_TRAINING_SEQ_MASK;
318 val |= FAST_TRAINING_SEQ(180);
319 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
322 static void artpec6_pcie_assert_core_reset(struct artpec6_pcie *artpec6_pcie)
324 u32 val;
326 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
327 switch (artpec6_pcie->variant) {
328 case ARTPEC6:
329 val |= PCIECFG_CORE_RESET_REQ;
330 break;
331 case ARTPEC7:
332 val &= ~PCIECFG_NOC_RESET;
333 break;
335 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
338 static void artpec6_pcie_deassert_core_reset(struct artpec6_pcie *artpec6_pcie)
340 u32 val;
342 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
343 switch (artpec6_pcie->variant) {
344 case ARTPEC6:
345 val &= ~PCIECFG_CORE_RESET_REQ;
346 break;
347 case ARTPEC7:
348 val |= PCIECFG_NOC_RESET;
349 break;
351 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
352 usleep_range(100, 200);
355 static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
357 struct dw_pcie *pci = artpec6_pcie->pci;
358 struct pcie_port *pp = &pci->pp;
360 if (IS_ENABLED(CONFIG_PCI_MSI))
361 dw_pcie_msi_init(pp);
364 static int artpec6_pcie_host_init(struct pcie_port *pp)
366 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
367 struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
369 artpec6_pcie_assert_core_reset(artpec6_pcie);
370 artpec6_pcie_init_phy(artpec6_pcie);
371 artpec6_pcie_deassert_core_reset(artpec6_pcie);
372 artpec6_pcie_wait_for_phy(artpec6_pcie);
373 artpec6_pcie_set_nfts(artpec6_pcie);
374 dw_pcie_setup_rc(pp);
375 artpec6_pcie_establish_link(pci);
376 dw_pcie_wait_for_link(pci);
377 artpec6_pcie_enable_interrupts(artpec6_pcie);
379 return 0;
382 static const struct dw_pcie_host_ops artpec6_pcie_host_ops = {
383 .host_init = artpec6_pcie_host_init,
386 static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
387 struct platform_device *pdev)
389 struct dw_pcie *pci = artpec6_pcie->pci;
390 struct pcie_port *pp = &pci->pp;
391 struct device *dev = pci->dev;
392 int ret;
394 if (IS_ENABLED(CONFIG_PCI_MSI)) {
395 pp->msi_irq = platform_get_irq_byname(pdev, "msi");
396 if (pp->msi_irq < 0) {
397 dev_err(dev, "failed to get MSI irq\n");
398 return pp->msi_irq;
402 pp->ops = &artpec6_pcie_host_ops;
404 ret = dw_pcie_host_init(pp);
405 if (ret) {
406 dev_err(dev, "failed to initialize host\n");
407 return ret;
410 return 0;
413 static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
415 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
416 struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
417 enum pci_barno bar;
419 artpec6_pcie_assert_core_reset(artpec6_pcie);
420 artpec6_pcie_init_phy(artpec6_pcie);
421 artpec6_pcie_deassert_core_reset(artpec6_pcie);
422 artpec6_pcie_wait_for_phy(artpec6_pcie);
423 artpec6_pcie_set_nfts(artpec6_pcie);
425 for (bar = BAR_0; bar <= BAR_5; bar++)
426 dw_pcie_ep_reset_bar(pci, bar);
429 static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
430 enum pci_epc_irq_type type, u16 interrupt_num)
432 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
434 switch (type) {
435 case PCI_EPC_IRQ_LEGACY:
436 dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
437 return -EINVAL;
438 case PCI_EPC_IRQ_MSI:
439 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
440 default:
441 dev_err(pci->dev, "UNKNOWN IRQ type\n");
444 return 0;
447 static struct dw_pcie_ep_ops pcie_ep_ops = {
448 .ep_init = artpec6_pcie_ep_init,
449 .raise_irq = artpec6_pcie_raise_irq,
452 static int artpec6_add_pcie_ep(struct artpec6_pcie *artpec6_pcie,
453 struct platform_device *pdev)
455 int ret;
456 struct dw_pcie_ep *ep;
457 struct resource *res;
458 struct device *dev = &pdev->dev;
459 struct dw_pcie *pci = artpec6_pcie->pci;
461 ep = &pci->ep;
462 ep->ops = &pcie_ep_ops;
464 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
465 pci->dbi_base2 = devm_ioremap_resource(dev, res);
466 if (IS_ERR(pci->dbi_base2))
467 return PTR_ERR(pci->dbi_base2);
469 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
470 if (!res)
471 return -EINVAL;
473 ep->phys_base = res->start;
474 ep->addr_size = resource_size(res);
476 ret = dw_pcie_ep_init(ep);
477 if (ret) {
478 dev_err(dev, "failed to initialize endpoint\n");
479 return ret;
482 return 0;
485 static int artpec6_pcie_probe(struct platform_device *pdev)
487 struct device *dev = &pdev->dev;
488 struct dw_pcie *pci;
489 struct artpec6_pcie *artpec6_pcie;
490 struct resource *dbi_base;
491 struct resource *phy_base;
492 int ret;
493 const struct of_device_id *match;
494 const struct artpec_pcie_of_data *data;
495 enum artpec_pcie_variants variant;
496 enum dw_pcie_device_mode mode;
498 match = of_match_device(artpec6_pcie_of_match, dev);
499 if (!match)
500 return -EINVAL;
502 data = (struct artpec_pcie_of_data *)match->data;
503 variant = (enum artpec_pcie_variants)data->variant;
504 mode = (enum dw_pcie_device_mode)data->mode;
506 artpec6_pcie = devm_kzalloc(dev, sizeof(*artpec6_pcie), GFP_KERNEL);
507 if (!artpec6_pcie)
508 return -ENOMEM;
510 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
511 if (!pci)
512 return -ENOMEM;
514 pci->dev = dev;
515 pci->ops = &dw_pcie_ops;
517 artpec6_pcie->pci = pci;
518 artpec6_pcie->variant = variant;
519 artpec6_pcie->mode = mode;
521 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
522 pci->dbi_base = devm_ioremap_resource(dev, dbi_base);
523 if (IS_ERR(pci->dbi_base))
524 return PTR_ERR(pci->dbi_base);
526 phy_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
527 artpec6_pcie->phy_base = devm_ioremap_resource(dev, phy_base);
528 if (IS_ERR(artpec6_pcie->phy_base))
529 return PTR_ERR(artpec6_pcie->phy_base);
531 artpec6_pcie->regmap =
532 syscon_regmap_lookup_by_phandle(dev->of_node,
533 "axis,syscon-pcie");
534 if (IS_ERR(artpec6_pcie->regmap))
535 return PTR_ERR(artpec6_pcie->regmap);
537 platform_set_drvdata(pdev, artpec6_pcie);
539 switch (artpec6_pcie->mode) {
540 case DW_PCIE_RC_TYPE:
541 if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_HOST))
542 return -ENODEV;
544 ret = artpec6_add_pcie_port(artpec6_pcie, pdev);
545 if (ret < 0)
546 return ret;
547 break;
548 case DW_PCIE_EP_TYPE: {
549 u32 val;
551 if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_EP))
552 return -ENODEV;
554 val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
555 val &= ~PCIECFG_DEVICE_TYPE_MASK;
556 artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
557 ret = artpec6_add_pcie_ep(artpec6_pcie, pdev);
558 if (ret < 0)
559 return ret;
560 break;
562 default:
563 dev_err(dev, "INVALID device type %d\n", artpec6_pcie->mode);
566 return 0;
569 static const struct artpec_pcie_of_data artpec6_pcie_rc_of_data = {
570 .variant = ARTPEC6,
571 .mode = DW_PCIE_RC_TYPE,
574 static const struct artpec_pcie_of_data artpec6_pcie_ep_of_data = {
575 .variant = ARTPEC6,
576 .mode = DW_PCIE_EP_TYPE,
579 static const struct artpec_pcie_of_data artpec7_pcie_rc_of_data = {
580 .variant = ARTPEC7,
581 .mode = DW_PCIE_RC_TYPE,
584 static const struct artpec_pcie_of_data artpec7_pcie_ep_of_data = {
585 .variant = ARTPEC7,
586 .mode = DW_PCIE_EP_TYPE,
589 static const struct of_device_id artpec6_pcie_of_match[] = {
591 .compatible = "axis,artpec6-pcie",
592 .data = &artpec6_pcie_rc_of_data,
595 .compatible = "axis,artpec6-pcie-ep",
596 .data = &artpec6_pcie_ep_of_data,
599 .compatible = "axis,artpec7-pcie",
600 .data = &artpec7_pcie_rc_of_data,
603 .compatible = "axis,artpec7-pcie-ep",
604 .data = &artpec7_pcie_ep_of_data,
609 static struct platform_driver artpec6_pcie_driver = {
610 .probe = artpec6_pcie_probe,
611 .driver = {
612 .name = "artpec6-pcie",
613 .of_match_table = artpec6_pcie_of_match,
614 .suppress_bind_attrs = true,
617 builtin_platform_driver(artpec6_pcie_driver);