1 // SPDX-License-Identifier: GPL-2.0
3 * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
5 * Copyright (C) 2013-2014 Texas Instruments Incorporated - https://www.ti.com
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/err.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/irqdomain.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/of_device.h>
19 #include <linux/of_gpio.h>
20 #include <linux/of_pci.h>
21 #include <linux/pci.h>
22 #include <linux/phy/phy.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/resource.h>
26 #include <linux/types.h>
27 #include <linux/mfd/syscon.h>
28 #include <linux/regmap.h>
29 #include <linux/gpio/consumer.h>
31 #include "../../pci.h"
32 #include "pcie-designware.h"
34 /* PCIe controller wrapper DRA7XX configuration registers */
36 #define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN 0x0024
37 #define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN 0x0028
38 #define ERR_SYS BIT(0)
39 #define ERR_FATAL BIT(1)
40 #define ERR_NONFATAL BIT(2)
41 #define ERR_COR BIT(3)
42 #define ERR_AXI BIT(4)
43 #define ERR_ECRC BIT(5)
44 #define PME_TURN_OFF BIT(8)
45 #define PME_TO_ACK BIT(9)
46 #define PM_PME BIT(10)
47 #define LINK_REQ_RST BIT(11)
48 #define LINK_UP_EVT BIT(12)
49 #define CFG_BME_EVT BIT(13)
50 #define CFG_MSE_EVT BIT(14)
51 #define INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
52 ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
53 LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)
55 #define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI 0x0034
56 #define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI 0x0038
62 #define LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)
64 #define PCIECTRL_TI_CONF_DEVICE_TYPE 0x0100
65 #define DEVICE_TYPE_EP 0x0
66 #define DEVICE_TYPE_LEG_EP 0x1
67 #define DEVICE_TYPE_RC 0x4
69 #define PCIECTRL_DRA7XX_CONF_DEVICE_CMD 0x0104
72 #define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C
73 #define LINK_UP BIT(16)
74 #define DRA7XX_CPU_TO_BUS_ADDR 0x0FFFFFFF
76 #define EXP_CAP_ID_OFFSET 0x70
78 #define PCIECTRL_TI_CONF_INTX_ASSERT 0x0124
79 #define PCIECTRL_TI_CONF_INTX_DEASSERT 0x0128
81 #define PCIECTRL_TI_CONF_MSI_XMT 0x012c
82 #define MSI_REQ_GRANT BIT(0)
83 #define MSI_VECTOR_SHIFT 7
85 #define PCIE_1LANE_2LANE_SELECTION BIT(13)
86 #define PCIE_B1C0_MODE_SEL BIT(2)
87 #define PCIE_B0_B1_TSYNCEN BIT(0)
91 void __iomem *base; /* DT ti_conf */
92 int phy_count; /* DT phy-names count */
95 struct irq_domain *irq_domain;
96 enum dw_pcie_device_mode mode;
99 struct dra7xx_pcie_of_data {
100 enum dw_pcie_device_mode mode;
101 u32 b1co_mode_sel_mask;
104 #define to_dra7xx_pcie(x) dev_get_drvdata((x)->dev)
106 static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
108 return readl(pcie->base + offset);
111 static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
114 writel(value, pcie->base + offset);
117 static u64 dra7xx_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
119 return pci_addr & DRA7XX_CPU_TO_BUS_ADDR;
122 static int dra7xx_pcie_link_up(struct dw_pcie *pci)
124 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
125 u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
127 return !!(reg & LINK_UP);
130 static void dra7xx_pcie_stop_link(struct dw_pcie *pci)
132 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
135 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
137 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
140 static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
142 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
143 struct device *dev = pci->dev;
145 u32 exp_cap_off = EXP_CAP_ID_OFFSET;
147 if (dw_pcie_link_up(pci)) {
148 dev_err(dev, "link is already up\n");
152 if (dra7xx->link_gen == 1) {
153 dw_pcie_read(pci->dbi_base + exp_cap_off + PCI_EXP_LNKCAP,
155 if ((reg & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
156 reg &= ~((u32)PCI_EXP_LNKCAP_SLS);
157 reg |= PCI_EXP_LNKCAP_SLS_2_5GB;
158 dw_pcie_write(pci->dbi_base + exp_cap_off +
159 PCI_EXP_LNKCAP, 4, reg);
162 dw_pcie_read(pci->dbi_base + exp_cap_off + PCI_EXP_LNKCTL2,
164 if ((reg & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
165 reg &= ~((u32)PCI_EXP_LNKCAP_SLS);
166 reg |= PCI_EXP_LNKCAP_SLS_2_5GB;
167 dw_pcie_write(pci->dbi_base + exp_cap_off +
168 PCI_EXP_LNKCTL2, 2, reg);
172 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
174 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
179 static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
181 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
182 LEG_EP_INTERRUPTS | MSI);
184 dra7xx_pcie_writel(dra7xx,
185 PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
186 MSI | LEG_EP_INTERRUPTS);
189 static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
191 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
193 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
197 static void dra7xx_pcie_enable_interrupts(struct dra7xx_pcie *dra7xx)
199 dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
200 dra7xx_pcie_enable_msi_interrupts(dra7xx);
203 static int dra7xx_pcie_host_init(struct pcie_port *pp)
205 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
206 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
208 dw_pcie_setup_rc(pp);
210 dra7xx_pcie_establish_link(pci);
211 dw_pcie_wait_for_link(pci);
212 dw_pcie_msi_init(pp);
213 dra7xx_pcie_enable_interrupts(dra7xx);
218 static int dra7xx_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
219 irq_hw_number_t hwirq)
221 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
222 irq_set_chip_data(irq, domain->host_data);
227 static const struct irq_domain_ops intx_domain_ops = {
228 .map = dra7xx_pcie_intx_map,
229 .xlate = pci_irqd_intx_xlate,
232 static int dra7xx_pcie_handle_msi(struct pcie_port *pp, int index)
234 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
238 val = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
239 (index * MSI_REG_CTRL_BLOCK_SIZE));
243 pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, 0);
244 while (pos != MAX_MSI_IRQS_PER_CTRL) {
245 irq = irq_find_mapping(pp->irq_domain,
246 (index * MAX_MSI_IRQS_PER_CTRL) + pos);
247 generic_handle_irq(irq);
249 pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, pos);
255 static void dra7xx_pcie_handle_msi_irq(struct pcie_port *pp)
257 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
258 int ret, i, count, num_ctrls;
260 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
263 * Need to make sure all MSI status bits read 0 before exiting.
264 * Else, new MSI IRQs are not registered by the wrapper. Have an
265 * upperbound for the loop and exit the IRQ in case of IRQ flood
266 * to avoid locking up system in interrupt context.
272 for (i = 0; i < num_ctrls; i++)
273 ret |= dra7xx_pcie_handle_msi(pp, i);
275 } while (ret && count <= 1000);
278 dev_warn_ratelimited(pci->dev,
279 "Too many MSI IRQs to handle\n");
282 static void dra7xx_pcie_msi_irq_handler(struct irq_desc *desc)
284 struct irq_chip *chip = irq_desc_get_chip(desc);
285 struct dra7xx_pcie *dra7xx;
287 struct pcie_port *pp;
291 chained_irq_enter(chip, desc);
293 pp = irq_desc_get_handler_data(desc);
294 pci = to_dw_pcie_from_pp(pp);
295 dra7xx = to_dra7xx_pcie(pci);
297 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
298 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);
302 dra7xx_pcie_handle_msi_irq(pp);
308 for_each_set_bit(bit, ®, PCI_NUM_INTX) {
309 virq = irq_find_mapping(dra7xx->irq_domain, bit);
311 generic_handle_irq(virq);
316 chained_irq_exit(chip, desc);
319 static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
321 struct dra7xx_pcie *dra7xx = arg;
322 struct dw_pcie *pci = dra7xx->pci;
323 struct device *dev = pci->dev;
324 struct dw_pcie_ep *ep = &pci->ep;
327 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);
330 dev_dbg(dev, "System Error\n");
333 dev_dbg(dev, "Fatal Error\n");
335 if (reg & ERR_NONFATAL)
336 dev_dbg(dev, "Non Fatal Error\n");
339 dev_dbg(dev, "Correctable Error\n");
342 dev_dbg(dev, "AXI tag lookup fatal Error\n");
345 dev_dbg(dev, "ECRC Error\n");
347 if (reg & PME_TURN_OFF)
349 "Power Management Event Turn-Off message received\n");
351 if (reg & PME_TO_ACK)
353 "Power Management Turn-Off Ack message received\n");
356 dev_dbg(dev, "PM Power Management Event message received\n");
358 if (reg & LINK_REQ_RST)
359 dev_dbg(dev, "Link Request Reset\n");
361 if (reg & LINK_UP_EVT) {
362 if (dra7xx->mode == DW_PCIE_EP_TYPE)
363 dw_pcie_ep_linkup(ep);
364 dev_dbg(dev, "Link-up state change\n");
367 if (reg & CFG_BME_EVT)
368 dev_dbg(dev, "CFG 'Bus Master Enable' change\n");
370 if (reg & CFG_MSE_EVT)
371 dev_dbg(dev, "CFG 'Memory Space Enable' change\n");
373 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);
378 static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
380 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
381 struct device *dev = pci->dev;
382 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
383 struct device_node *node = dev->of_node;
384 struct device_node *pcie_intc_node = of_get_next_child(node, NULL);
386 if (!pcie_intc_node) {
387 dev_err(dev, "No PCIe Intc node found\n");
391 irq_set_chained_handler_and_data(pp->irq, dra7xx_pcie_msi_irq_handler,
393 dra7xx->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
394 &intx_domain_ops, pp);
395 of_node_put(pcie_intc_node);
396 if (!dra7xx->irq_domain) {
397 dev_err(dev, "Failed to get a INTx IRQ domain\n");
404 static void dra7xx_pcie_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
406 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
407 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
410 msi_target = (u64)pp->msi_data;
412 msg->address_lo = lower_32_bits(msi_target);
413 msg->address_hi = upper_32_bits(msi_target);
415 msg->data = d->hwirq;
417 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
418 (int)d->hwirq, msg->address_hi, msg->address_lo);
421 static int dra7xx_pcie_msi_set_affinity(struct irq_data *d,
422 const struct cpumask *mask,
428 static void dra7xx_pcie_bottom_mask(struct irq_data *d)
430 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
431 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
432 unsigned int res, bit, ctrl;
435 raw_spin_lock_irqsave(&pp->lock, flags);
437 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
438 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
439 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
441 pp->irq_mask[ctrl] |= BIT(bit);
442 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res,
445 raw_spin_unlock_irqrestore(&pp->lock, flags);
448 static void dra7xx_pcie_bottom_unmask(struct irq_data *d)
450 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
451 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
452 unsigned int res, bit, ctrl;
455 raw_spin_lock_irqsave(&pp->lock, flags);
457 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
458 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
459 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
461 pp->irq_mask[ctrl] &= ~BIT(bit);
462 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res,
465 raw_spin_unlock_irqrestore(&pp->lock, flags);
468 static void dra7xx_pcie_bottom_ack(struct irq_data *d)
470 struct pcie_port *pp = irq_data_get_irq_chip_data(d);
471 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
472 unsigned int res, bit, ctrl;
474 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
475 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
476 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
478 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
481 static struct irq_chip dra7xx_pci_msi_bottom_irq_chip = {
482 .name = "DRA7XX-PCI-MSI",
483 .irq_ack = dra7xx_pcie_bottom_ack,
484 .irq_compose_msi_msg = dra7xx_pcie_setup_msi_msg,
485 .irq_set_affinity = dra7xx_pcie_msi_set_affinity,
486 .irq_mask = dra7xx_pcie_bottom_mask,
487 .irq_unmask = dra7xx_pcie_bottom_unmask,
490 static int dra7xx_pcie_msi_host_init(struct pcie_port *pp)
492 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
495 pp->msi_irq_chip = &dra7xx_pci_msi_bottom_irq_chip;
497 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
498 /* Initialize IRQ Status array */
499 for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
500 pp->irq_mask[ctrl] = ~0;
501 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
502 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
504 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
505 (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
509 return dw_pcie_allocate_domains(pp);
512 static const struct dw_pcie_host_ops dra7xx_pcie_host_ops = {
513 .host_init = dra7xx_pcie_host_init,
514 .msi_host_init = dra7xx_pcie_msi_host_init,
517 static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep)
519 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
520 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
523 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
524 dw_pcie_ep_reset_bar(pci, bar);
526 dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
529 static void dra7xx_pcie_raise_legacy_irq(struct dra7xx_pcie *dra7xx)
531 dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_ASSERT, 0x1);
533 dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_DEASSERT, 0x1);
536 static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
541 reg = (interrupt_num - 1) << MSI_VECTOR_SHIFT;
542 reg |= MSI_REQ_GRANT;
543 dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_MSI_XMT, reg);
546 static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
547 enum pci_epc_irq_type type, u16 interrupt_num)
549 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
550 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
553 case PCI_EPC_IRQ_LEGACY:
554 dra7xx_pcie_raise_legacy_irq(dra7xx);
556 case PCI_EPC_IRQ_MSI:
557 dra7xx_pcie_raise_msi_irq(dra7xx, interrupt_num);
560 dev_err(pci->dev, "UNKNOWN IRQ type\n");
566 static const struct pci_epc_features dra7xx_pcie_epc_features = {
567 .linkup_notifier = true,
569 .msix_capable = false,
572 static const struct pci_epc_features*
573 dra7xx_pcie_get_features(struct dw_pcie_ep *ep)
575 return &dra7xx_pcie_epc_features;
578 static const struct dw_pcie_ep_ops pcie_ep_ops = {
579 .ep_init = dra7xx_pcie_ep_init,
580 .raise_irq = dra7xx_pcie_raise_irq,
581 .get_features = dra7xx_pcie_get_features,
584 static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
585 struct platform_device *pdev)
588 struct dw_pcie_ep *ep;
589 struct resource *res;
590 struct device *dev = &pdev->dev;
591 struct dw_pcie *pci = dra7xx->pci;
594 ep->ops = &pcie_ep_ops;
596 pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "ep_dbics");
597 if (IS_ERR(pci->dbi_base))
598 return PTR_ERR(pci->dbi_base);
601 devm_platform_ioremap_resource_byname(pdev, "ep_dbics2");
602 if (IS_ERR(pci->dbi_base2))
603 return PTR_ERR(pci->dbi_base2);
605 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
609 ep->phys_base = res->start;
610 ep->addr_size = resource_size(res);
612 ret = dw_pcie_ep_init(ep);
614 dev_err(dev, "failed to initialize endpoint\n");
621 static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
622 struct platform_device *pdev)
625 struct dw_pcie *pci = dra7xx->pci;
626 struct pcie_port *pp = &pci->pp;
627 struct device *dev = pci->dev;
629 pp->irq = platform_get_irq(pdev, 1);
633 ret = dra7xx_pcie_init_irq_domain(pp);
637 pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "rc_dbics");
638 if (IS_ERR(pci->dbi_base))
639 return PTR_ERR(pci->dbi_base);
641 pp->ops = &dra7xx_pcie_host_ops;
643 ret = dw_pcie_host_init(pp);
645 dev_err(dev, "failed to initialize host\n");
652 static const struct dw_pcie_ops dw_pcie_ops = {
653 .cpu_addr_fixup = dra7xx_pcie_cpu_addr_fixup,
654 .start_link = dra7xx_pcie_establish_link,
655 .stop_link = dra7xx_pcie_stop_link,
656 .link_up = dra7xx_pcie_link_up,
659 static void dra7xx_pcie_disable_phy(struct dra7xx_pcie *dra7xx)
661 int phy_count = dra7xx->phy_count;
663 while (phy_count--) {
664 phy_power_off(dra7xx->phy[phy_count]);
665 phy_exit(dra7xx->phy[phy_count]);
669 static int dra7xx_pcie_enable_phy(struct dra7xx_pcie *dra7xx)
671 int phy_count = dra7xx->phy_count;
675 for (i = 0; i < phy_count; i++) {
676 ret = phy_set_mode(dra7xx->phy[i], PHY_MODE_PCIE);
680 ret = phy_init(dra7xx->phy[i]);
684 ret = phy_power_on(dra7xx->phy[i]);
686 phy_exit(dra7xx->phy[i]);
695 phy_power_off(dra7xx->phy[i]);
696 phy_exit(dra7xx->phy[i]);
702 static const struct dra7xx_pcie_of_data dra7xx_pcie_rc_of_data = {
703 .mode = DW_PCIE_RC_TYPE,
706 static const struct dra7xx_pcie_of_data dra7xx_pcie_ep_of_data = {
707 .mode = DW_PCIE_EP_TYPE,
710 static const struct dra7xx_pcie_of_data dra746_pcie_rc_of_data = {
711 .b1co_mode_sel_mask = BIT(2),
712 .mode = DW_PCIE_RC_TYPE,
715 static const struct dra7xx_pcie_of_data dra726_pcie_rc_of_data = {
716 .b1co_mode_sel_mask = GENMASK(3, 2),
717 .mode = DW_PCIE_RC_TYPE,
720 static const struct dra7xx_pcie_of_data dra746_pcie_ep_of_data = {
721 .b1co_mode_sel_mask = BIT(2),
722 .mode = DW_PCIE_EP_TYPE,
725 static const struct dra7xx_pcie_of_data dra726_pcie_ep_of_data = {
726 .b1co_mode_sel_mask = GENMASK(3, 2),
727 .mode = DW_PCIE_EP_TYPE,
730 static const struct of_device_id of_dra7xx_pcie_match[] = {
732 .compatible = "ti,dra7-pcie",
733 .data = &dra7xx_pcie_rc_of_data,
736 .compatible = "ti,dra7-pcie-ep",
737 .data = &dra7xx_pcie_ep_of_data,
740 .compatible = "ti,dra746-pcie-rc",
741 .data = &dra746_pcie_rc_of_data,
744 .compatible = "ti,dra726-pcie-rc",
745 .data = &dra726_pcie_rc_of_data,
748 .compatible = "ti,dra746-pcie-ep",
749 .data = &dra746_pcie_ep_of_data,
752 .compatible = "ti,dra726-pcie-ep",
753 .data = &dra726_pcie_ep_of_data,
759 * dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
760 * @dra7xx: the dra7xx device where the workaround should be applied
762 * Access to the PCIe slave port that are not 32-bit aligned will result
763 * in incorrect mapping to TLP Address and Byte enable fields. Therefore,
764 * byte and half-word accesses are not possible to byte offset 0x1, 0x2, or
767 * To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
769 static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
772 struct device_node *np = dev->of_node;
773 struct of_phandle_args args;
774 struct regmap *regmap;
776 regmap = syscon_regmap_lookup_by_phandle(np,
777 "ti,syscon-unaligned-access");
778 if (IS_ERR(regmap)) {
779 dev_dbg(dev, "can't get ti,syscon-unaligned-access\n");
783 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-unaligned-access",
786 dev_err(dev, "failed to parse ti,syscon-unaligned-access\n");
790 ret = regmap_update_bits(regmap, args.args[0], args.args[1],
793 dev_err(dev, "failed to enable unaligned access\n");
795 of_node_put(args.np);
800 static int dra7xx_pcie_configure_two_lane(struct device *dev,
801 u32 b1co_mode_sel_mask)
803 struct device_node *np = dev->of_node;
804 struct regmap *pcie_syscon;
805 unsigned int pcie_reg;
809 pcie_syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-lane-sel");
810 if (IS_ERR(pcie_syscon)) {
811 dev_err(dev, "unable to get ti,syscon-lane-sel\n");
815 if (of_property_read_u32_index(np, "ti,syscon-lane-sel", 1,
817 dev_err(dev, "couldn't get lane selection reg offset\n");
821 mask = b1co_mode_sel_mask | PCIE_B0_B1_TSYNCEN;
822 val = PCIE_B1C0_MODE_SEL | PCIE_B0_B1_TSYNCEN;
823 regmap_update_bits(pcie_syscon, pcie_reg, mask, val);
828 static int __init dra7xx_pcie_probe(struct platform_device *pdev)
836 struct device_link **link;
839 struct dra7xx_pcie *dra7xx;
840 struct device *dev = &pdev->dev;
841 struct device_node *np = dev->of_node;
843 struct gpio_desc *reset;
844 const struct of_device_id *match;
845 const struct dra7xx_pcie_of_data *data;
846 enum dw_pcie_device_mode mode;
847 u32 b1co_mode_sel_mask;
849 match = of_match_device(of_match_ptr(of_dra7xx_pcie_match), dev);
853 data = (struct dra7xx_pcie_of_data *)match->data;
854 mode = (enum dw_pcie_device_mode)data->mode;
855 b1co_mode_sel_mask = data->b1co_mode_sel_mask;
857 dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
861 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
866 pci->ops = &dw_pcie_ops;
868 irq = platform_get_irq(pdev, 0);
872 base = devm_platform_ioremap_resource_byname(pdev, "ti_conf");
874 return PTR_ERR(base);
876 phy_count = of_property_count_strings(np, "phy-names");
878 dev_err(dev, "unable to find the strings\n");
882 phy = devm_kcalloc(dev, phy_count, sizeof(*phy), GFP_KERNEL);
886 link = devm_kcalloc(dev, phy_count, sizeof(*link), GFP_KERNEL);
890 for (i = 0; i < phy_count; i++) {
891 snprintf(name, sizeof(name), "pcie-phy%d", i);
892 phy[i] = devm_phy_get(dev, name);
894 return PTR_ERR(phy[i]);
896 link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
906 dra7xx->phy_count = phy_count;
908 if (phy_count == 2) {
909 ret = dra7xx_pcie_configure_two_lane(dev, b1co_mode_sel_mask);
911 dra7xx->phy_count = 1; /* Fallback to x1 lane mode */
914 ret = dra7xx_pcie_enable_phy(dra7xx);
916 dev_err(dev, "failed to enable phy\n");
920 platform_set_drvdata(pdev, dra7xx);
922 pm_runtime_enable(dev);
923 ret = pm_runtime_get_sync(dev);
925 dev_err(dev, "pm_runtime_get_sync failed\n");
929 reset = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
931 ret = PTR_ERR(reset);
932 dev_err(&pdev->dev, "gpio request failed, ret %d\n", ret);
936 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
938 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
940 dra7xx->link_gen = of_pci_get_max_link_speed(np);
941 if (dra7xx->link_gen < 0 || dra7xx->link_gen > 2)
942 dra7xx->link_gen = 2;
945 case DW_PCIE_RC_TYPE:
946 if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
951 dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
954 ret = dra7xx_pcie_unaligned_memaccess(dev);
956 dev_err(dev, "WA for Errata i870 not applied\n");
958 ret = dra7xx_add_pcie_port(dra7xx, pdev);
962 case DW_PCIE_EP_TYPE:
963 if (!IS_ENABLED(CONFIG_PCI_DRA7XX_EP)) {
968 dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
971 ret = dra7xx_pcie_unaligned_memaccess(dev);
975 ret = dra7xx_add_pcie_ep(dra7xx, pdev);
980 dev_err(dev, "INVALID device type %d\n", mode);
984 ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
985 IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
987 dev_err(dev, "failed to request irq\n");
996 pm_runtime_disable(dev);
997 dra7xx_pcie_disable_phy(dra7xx);
1001 device_link_del(link[i]);
1006 #ifdef CONFIG_PM_SLEEP
1007 static int dra7xx_pcie_suspend(struct device *dev)
1009 struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
1010 struct dw_pcie *pci = dra7xx->pci;
1013 if (dra7xx->mode != DW_PCIE_RC_TYPE)
1017 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
1018 val &= ~PCI_COMMAND_MEMORY;
1019 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
1024 static int dra7xx_pcie_resume(struct device *dev)
1026 struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
1027 struct dw_pcie *pci = dra7xx->pci;
1030 if (dra7xx->mode != DW_PCIE_RC_TYPE)
1034 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
1035 val |= PCI_COMMAND_MEMORY;
1036 dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
1041 static int dra7xx_pcie_suspend_noirq(struct device *dev)
1043 struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
1045 dra7xx_pcie_disable_phy(dra7xx);
1050 static int dra7xx_pcie_resume_noirq(struct device *dev)
1052 struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
1055 ret = dra7xx_pcie_enable_phy(dra7xx);
1057 dev_err(dev, "failed to enable phy\n");
1065 static void dra7xx_pcie_shutdown(struct platform_device *pdev)
1067 struct device *dev = &pdev->dev;
1068 struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
1071 dra7xx_pcie_stop_link(dra7xx->pci);
1073 ret = pm_runtime_put_sync(dev);
1075 dev_dbg(dev, "pm_runtime_put_sync failed\n");
1077 pm_runtime_disable(dev);
1078 dra7xx_pcie_disable_phy(dra7xx);
1081 static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
1082 SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
1083 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
1084 dra7xx_pcie_resume_noirq)
1087 static struct platform_driver dra7xx_pcie_driver = {
1089 .name = "dra7-pcie",
1090 .of_match_table = of_dra7xx_pcie_match,
1091 .suppress_bind_attrs = true,
1092 .pm = &dra7xx_pcie_pm_ops,
1094 .shutdown = dra7xx_pcie_shutdown,
1096 builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);