2 * PCIe driver for Renesas R-Car SoCs
3 * Copyright (C) 2014 Renesas Electronics Europe Ltd
6 * arch/sh/drivers/pci/pcie-sh7786.c
7 * arch/sh/drivers/pci/ops-sh7786.c
8 * Copyright (C) 2009 - 2011 Paul Mundt
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/irqdomain.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/msi.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_pci.h>
26 #include <linux/of_platform.h>
27 #include <linux/pci.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
31 #define DRV_NAME "rcar-pcie"
33 #define PCIECAR 0x000010
34 #define PCIECCTLR 0x000018
35 #define CONFIG_SEND_ENABLE (1 << 31)
36 #define TYPE0 (0 << 8)
37 #define TYPE1 (1 << 8)
38 #define PCIECDR 0x000020
39 #define PCIEMSR 0x000028
40 #define PCIEINTXR 0x000400
41 #define PCIEMSITXR 0x000840
43 /* Transfer control */
44 #define PCIETCTLR 0x02000
46 #define PCIETSTR 0x02004
47 #define DATA_LINK_ACTIVE 1
48 #define PCIEERRFR 0x02020
49 #define UNSUPPORTED_REQUEST (1 << 4)
50 #define PCIEMSIFR 0x02044
51 #define PCIEMSIALR 0x02048
53 #define PCIEMSIAUR 0x0204c
54 #define PCIEMSIIER 0x02050
56 /* root port address */
57 #define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
59 /* local address reg & mask */
60 #define PCIELAR(x) (0x02200 + ((x) * 0x20))
61 #define PCIELAMR(x) (0x02208 + ((x) * 0x20))
62 #define LAM_PREFETCH (1 << 3)
63 #define LAM_64BIT (1 << 2)
64 #define LAR_ENABLE (1 << 1)
66 /* PCIe address reg & mask */
67 #define PCIEPARL(x) (0x03400 + ((x) * 0x20))
68 #define PCIEPARH(x) (0x03404 + ((x) * 0x20))
69 #define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
70 #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
71 #define PAR_ENABLE (1 << 31)
72 #define IO_SPACE (1 << 8)
75 #define PCICONF(x) (0x010000 + ((x) * 0x4))
76 #define PMCAP(x) (0x010040 + ((x) * 0x4))
77 #define EXPCAP(x) (0x010070 + ((x) * 0x4))
78 #define VCCAP(x) (0x010100 + ((x) * 0x4))
81 #define IDSETR1 0x011004
82 #define TLCTLR 0x011048
83 #define MACSR 0x011054
84 #define MACCTLR 0x011058
85 #define SCRAMBLE_DISABLE (1 << 27)
88 #define H1_PCIEPHYADRR 0x04000c
89 #define WRITE_CMD (1 << 16)
90 #define PHY_ACK (1 << 24)
94 #define H1_PCIEPHYDOUTR 0x040014
95 #define H1_PCIEPHYSR 0x040018
97 #define INT_PCI_MSI_NR 32
99 #define RCONF(x) (PCICONF(0)+(x))
100 #define RPMCAP(x) (PMCAP(0)+(x))
101 #define REXPCAP(x) (EXPCAP(0)+(x))
102 #define RVCCAP(x) (VCCAP(0)+(x))
104 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
105 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
106 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
108 #define PCI_MAX_RESOURCES 4
109 #define MAX_NR_INBOUND_MAPS 6
112 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
113 struct irq_domain *domain;
114 struct msi_chip chip;
121 static inline struct rcar_msi *to_rcar_msi(struct msi_chip *chip)
123 return container_of(chip, struct rcar_msi, chip);
126 /* Structure representing the PCIe interface */
130 struct resource res[PCI_MAX_RESOURCES];
131 struct resource busn;
138 static inline struct rcar_pcie *sys_to_pcie(struct pci_sys_data *sys)
140 return sys->private_data;
143 static void pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
146 writel(val, pcie->base + reg);
149 static unsigned long pci_read_reg(struct rcar_pcie *pcie, unsigned long reg)
151 return readl(pcie->base + reg);
159 static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
161 int shift = 8 * (where & 3);
162 u32 val = pci_read_reg(pcie, where & ~3);
164 val &= ~(mask << shift);
165 val |= data << shift;
166 pci_write_reg(pcie, val, where & ~3);
169 static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
171 int shift = 8 * (where & 3);
172 u32 val = pci_read_reg(pcie, where & ~3);
177 /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
178 static int rcar_pcie_config_access(struct rcar_pcie *pcie,
179 unsigned char access_type, struct pci_bus *bus,
180 unsigned int devfn, int where, u32 *data)
182 int dev, func, reg, index;
184 dev = PCI_SLOT(devfn);
185 func = PCI_FUNC(devfn);
190 * While each channel has its own memory-mapped extended config
191 * space, it's generally only accessible when in endpoint mode.
192 * When in root complex mode, the controller is unable to target
193 * itself with either type 0 or type 1 accesses, and indeed, any
194 * controller initiated target transfer to its own config space
195 * result in a completer abort.
197 * Each channel effectively only supports a single device, but as
198 * the same channel <-> device access works for any PCI_SLOT()
199 * value, we cheat a bit here and bind the controller's config
200 * space to devfn 0 in order to enable self-enumeration. In this
201 * case the regular ECAR/ECDR path is sidelined and the mangled
202 * config access itself is initiated as an internal bus transaction.
204 if (pci_is_root_bus(bus)) {
206 return PCIBIOS_DEVICE_NOT_FOUND;
208 if (access_type == PCI_ACCESS_READ) {
209 *data = pci_read_reg(pcie, PCICONF(index));
211 /* Keep an eye out for changes to the root bus number */
212 if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
213 pcie->root_bus_nr = *data & 0xff;
215 pci_write_reg(pcie, *data, PCICONF(index));
218 return PCIBIOS_SUCCESSFUL;
221 if (pcie->root_bus_nr < 0)
222 return PCIBIOS_DEVICE_NOT_FOUND;
225 pci_write_reg(pcie, pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
227 /* Set the PIO address */
228 pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) | PCIE_CONF_DEV(dev) |
229 PCIE_CONF_FUNC(func) | reg, PCIECAR);
231 /* Enable the configuration access */
232 if (bus->parent->number == pcie->root_bus_nr)
233 pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
235 pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
237 /* Check for errors */
238 if (pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
239 return PCIBIOS_DEVICE_NOT_FOUND;
241 /* Check for master and target aborts */
242 if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
243 (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
244 return PCIBIOS_DEVICE_NOT_FOUND;
246 if (access_type == PCI_ACCESS_READ)
247 *data = pci_read_reg(pcie, PCIECDR);
249 pci_write_reg(pcie, *data, PCIECDR);
251 /* Disable the configuration access */
252 pci_write_reg(pcie, 0, PCIECCTLR);
254 return PCIBIOS_SUCCESSFUL;
257 static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
258 int where, int size, u32 *val)
260 struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata);
263 if ((size == 2) && (where & 1))
264 return PCIBIOS_BAD_REGISTER_NUMBER;
265 else if ((size == 4) && (where & 3))
266 return PCIBIOS_BAD_REGISTER_NUMBER;
268 ret = rcar_pcie_config_access(pcie, PCI_ACCESS_READ,
269 bus, devfn, where, val);
270 if (ret != PCIBIOS_SUCCESSFUL) {
276 *val = (*val >> (8 * (where & 3))) & 0xff;
278 *val = (*val >> (8 * (where & 2))) & 0xffff;
280 dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
281 bus->number, devfn, where, size, (unsigned long)*val);
286 /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
287 static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
288 int where, int size, u32 val)
290 struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata);
294 if ((size == 2) && (where & 1))
295 return PCIBIOS_BAD_REGISTER_NUMBER;
296 else if ((size == 4) && (where & 3))
297 return PCIBIOS_BAD_REGISTER_NUMBER;
299 ret = rcar_pcie_config_access(pcie, PCI_ACCESS_READ,
300 bus, devfn, where, &data);
301 if (ret != PCIBIOS_SUCCESSFUL)
304 dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
305 bus->number, devfn, where, size, (unsigned long)val);
308 shift = 8 * (where & 3);
309 data &= ~(0xff << shift);
310 data |= ((val & 0xff) << shift);
311 } else if (size == 2) {
312 shift = 8 * (where & 2);
313 data &= ~(0xffff << shift);
314 data |= ((val & 0xffff) << shift);
318 ret = rcar_pcie_config_access(pcie, PCI_ACCESS_WRITE,
319 bus, devfn, where, &data);
324 static struct pci_ops rcar_pcie_ops = {
325 .read = rcar_pcie_read_conf,
326 .write = rcar_pcie_write_conf,
329 static void rcar_pcie_setup_window(int win, struct resource *res,
330 struct rcar_pcie *pcie)
332 /* Setup PCIe address space mappings for each resource */
333 resource_size_t size;
336 pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
339 * The PAMR mask is calculated in units of 128Bytes, which
340 * keeps things pretty simple.
342 size = resource_size(res);
343 mask = (roundup_pow_of_two(size) / SZ_128) - 1;
344 pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
346 pci_write_reg(pcie, upper_32_bits(res->start), PCIEPARH(win));
347 pci_write_reg(pcie, lower_32_bits(res->start), PCIEPARL(win));
349 /* First resource is for IO */
351 if (res->flags & IORESOURCE_IO)
354 pci_write_reg(pcie, mask, PCIEPTCTLR(win));
357 static int rcar_pcie_setup(int nr, struct pci_sys_data *sys)
359 struct rcar_pcie *pcie = sys_to_pcie(sys);
360 struct resource *res;
363 pcie->root_bus_nr = -1;
365 /* Setup PCI resources */
366 for (i = 0; i < PCI_MAX_RESOURCES; i++) {
372 rcar_pcie_setup_window(i, res, pcie);
374 if (res->flags & IORESOURCE_IO)
375 pci_ioremap_io(nr * SZ_64K, res->start);
377 pci_add_resource(&sys->resources, res);
379 pci_add_resource(&sys->resources, &pcie->busn);
384 static void rcar_pcie_add_bus(struct pci_bus *bus)
386 if (IS_ENABLED(CONFIG_PCI_MSI)) {
387 struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata);
389 bus->msi = &pcie->msi.chip;
393 struct hw_pci rcar_pci = {
394 .setup = rcar_pcie_setup,
395 .map_irq = of_irq_parse_and_map_pci,
396 .ops = &rcar_pcie_ops,
397 .add_bus = rcar_pcie_add_bus,
400 static void rcar_pcie_enable(struct rcar_pcie *pcie)
402 struct platform_device *pdev = to_platform_device(pcie->dev);
404 rcar_pci.nr_controllers = 1;
405 rcar_pci.private_data = (void **)&pcie;
407 pci_common_init_dev(&pdev->dev, &rcar_pci);
408 #ifdef CONFIG_PCI_DOMAINS
413 static int phy_wait_for_ack(struct rcar_pcie *pcie)
415 unsigned int timeout = 100;
418 if (pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
424 dev_err(pcie->dev, "Access to PCIe phy timed out\n");
429 static void phy_write_reg(struct rcar_pcie *pcie,
430 unsigned int rate, unsigned int addr,
431 unsigned int lane, unsigned int data)
433 unsigned long phyaddr;
435 phyaddr = WRITE_CMD |
436 ((rate & 1) << RATE_POS) |
437 ((lane & 0xf) << LANE_POS) |
438 ((addr & 0xff) << ADR_POS);
441 pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
442 pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
444 /* Ignore errors as they will be dealt with if the data link is down */
445 phy_wait_for_ack(pcie);
448 pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
449 pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
451 /* Ignore errors as they will be dealt with if the data link is down */
452 phy_wait_for_ack(pcie);
455 static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
457 unsigned int timeout = 10;
460 if ((pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
469 static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
473 /* Begin initialization */
474 pci_write_reg(pcie, 0, PCIETCTLR);
477 pci_write_reg(pcie, 1, PCIEMSR);
480 * Initial header for port config space is type 1, set the device
481 * class to match. Hardware takes care of propagating the IDSETR
482 * settings, so there is no need to bother with a quirk.
484 pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);
487 * Setup Secondary Bus Number & Subordinate Bus Number, even though
488 * they aren't used, to avoid bridge being detected as broken.
490 rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
491 rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
493 /* Initialize default capabilities. */
494 rcar_rmw32(pcie, REXPCAP(0), 0, PCI_CAP_ID_EXP);
495 rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
496 PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
497 rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
498 PCI_HEADER_TYPE_BRIDGE);
500 /* Enable data link layer active state reporting */
501 rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), 0, PCI_EXP_LNKCAP_DLLLARC);
503 /* Write out the physical slot number = 0 */
504 rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
506 /* Set the completion timer timeout to the maximum 50ms. */
507 rcar_rmw32(pcie, TLCTLR+1, 0x3f, 50);
509 /* Terminate list of capabilities (Next Capability Offset=0) */
510 rcar_rmw32(pcie, RVCCAP(0), 0xfff0, 0);
512 /* Enable MAC data scrambling. */
513 rcar_rmw32(pcie, MACCTLR, SCRAMBLE_DISABLE, 0);
516 if (IS_ENABLED(CONFIG_PCI_MSI))
517 pci_write_reg(pcie, 0x101f0000, PCIEMSITXR);
519 /* Finish initialization - establish a PCI Express link */
520 pci_write_reg(pcie, CFINIT, PCIETCTLR);
522 /* This will timeout if we don't have a link. */
523 err = rcar_pcie_wait_for_dl(pcie);
527 /* Enable INTx interrupts */
528 rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
530 /* Enable slave Bus Mastering */
531 rcar_rmw32(pcie, RCONF(PCI_STATUS), PCI_STATUS_DEVSEL_MASK,
532 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
533 PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST);
540 static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie)
542 unsigned int timeout = 10;
544 /* Initialize the phy */
545 phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
546 phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
547 phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
548 phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
549 phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
550 phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
551 phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
552 phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
553 phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
554 phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
555 phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
556 phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
558 phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
559 phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
560 phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
563 if (pci_read_reg(pcie, H1_PCIEPHYSR))
564 return rcar_pcie_hw_init(pcie);
572 static int rcar_msi_alloc(struct rcar_msi *chip)
576 mutex_lock(&chip->lock);
578 msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
579 if (msi < INT_PCI_MSI_NR)
580 set_bit(msi, chip->used);
584 mutex_unlock(&chip->lock);
589 static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
591 mutex_lock(&chip->lock);
592 clear_bit(irq, chip->used);
593 mutex_unlock(&chip->lock);
596 static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
598 struct rcar_pcie *pcie = data;
599 struct rcar_msi *msi = &pcie->msi;
602 reg = pci_read_reg(pcie, PCIEMSIFR);
604 /* MSI & INTx share an interrupt - we only handle MSI here */
609 unsigned int index = find_first_bit(®, 32);
612 /* clear the interrupt */
613 pci_write_reg(pcie, 1 << index, PCIEMSIFR);
615 irq = irq_find_mapping(msi->domain, index);
617 if (test_bit(index, msi->used))
618 generic_handle_irq(irq);
620 dev_info(pcie->dev, "unhandled MSI\n");
622 /* Unknown MSI, just clear it */
623 dev_dbg(pcie->dev, "unexpected MSI\n");
626 /* see if there's any more pending in this vector */
627 reg = pci_read_reg(pcie, PCIEMSIFR);
633 static int rcar_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
634 struct msi_desc *desc)
636 struct rcar_msi *msi = to_rcar_msi(chip);
637 struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
642 hwirq = rcar_msi_alloc(msi);
646 irq = irq_create_mapping(msi->domain, hwirq);
648 rcar_msi_free(msi, hwirq);
652 irq_set_msi_desc(irq, desc);
654 msg.address_lo = pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
655 msg.address_hi = pci_read_reg(pcie, PCIEMSIAUR);
658 write_msi_msg(irq, &msg);
663 static void rcar_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
665 struct rcar_msi *msi = to_rcar_msi(chip);
666 struct irq_data *d = irq_get_irq_data(irq);
668 rcar_msi_free(msi, d->hwirq);
671 static struct irq_chip rcar_msi_irq_chip = {
672 .name = "R-Car PCIe MSI",
673 .irq_enable = unmask_msi_irq,
674 .irq_disable = mask_msi_irq,
675 .irq_mask = mask_msi_irq,
676 .irq_unmask = unmask_msi_irq,
679 static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
680 irq_hw_number_t hwirq)
682 irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
683 irq_set_chip_data(irq, domain->host_data);
684 set_irq_flags(irq, IRQF_VALID);
689 static const struct irq_domain_ops msi_domain_ops = {
693 static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
695 struct platform_device *pdev = to_platform_device(pcie->dev);
696 struct rcar_msi *msi = &pcie->msi;
700 mutex_init(&msi->lock);
702 msi->chip.dev = pcie->dev;
703 msi->chip.setup_irq = rcar_msi_setup_irq;
704 msi->chip.teardown_irq = rcar_msi_teardown_irq;
706 msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
707 &msi_domain_ops, &msi->chip);
709 dev_err(&pdev->dev, "failed to create IRQ domain\n");
713 /* Two irqs are for MSI, but they are also used for non-MSI irqs */
714 err = devm_request_irq(&pdev->dev, msi->irq1, rcar_pcie_msi_irq,
715 IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
717 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
721 err = devm_request_irq(&pdev->dev, msi->irq2, rcar_pcie_msi_irq,
722 IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
724 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
728 /* setup MSI data target */
729 msi->pages = __get_free_pages(GFP_KERNEL, 0);
730 base = virt_to_phys((void *)msi->pages);
732 pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
733 pci_write_reg(pcie, 0, PCIEMSIAUR);
735 /* enable all MSI interrupts */
736 pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
741 irq_domain_remove(msi->domain);
745 static int rcar_pcie_get_resources(struct platform_device *pdev,
746 struct rcar_pcie *pcie)
751 err = of_address_to_resource(pdev->dev.of_node, 0, &res);
755 pcie->clk = devm_clk_get(&pdev->dev, "pcie");
756 if (IS_ERR(pcie->clk)) {
757 dev_err(pcie->dev, "cannot get platform clock\n");
758 return PTR_ERR(pcie->clk);
760 err = clk_prepare_enable(pcie->clk);
764 pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
765 if (IS_ERR(pcie->bus_clk)) {
766 dev_err(pcie->dev, "cannot get pcie bus clock\n");
767 err = PTR_ERR(pcie->bus_clk);
770 err = clk_prepare_enable(pcie->bus_clk);
774 i = irq_of_parse_and_map(pdev->dev.of_node, 0);
776 dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
782 i = irq_of_parse_and_map(pdev->dev.of_node, 1);
784 dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
790 pcie->base = devm_ioremap_resource(&pdev->dev, &res);
791 if (IS_ERR(pcie->base)) {
792 err = PTR_ERR(pcie->base);
799 clk_disable_unprepare(pcie->bus_clk);
801 clk_disable_unprepare(pcie->clk);
806 static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
807 struct of_pci_range *range,
810 u64 restype = range->flags;
811 u64 cpu_addr = range->cpu_addr;
812 u64 cpu_end = range->cpu_addr + range->size;
813 u64 pci_addr = range->pci_addr;
814 u32 flags = LAM_64BIT | LAR_ENABLE;
819 if (restype & IORESOURCE_PREFETCH)
820 flags |= LAM_PREFETCH;
823 * If the size of the range is larger than the alignment of the start
824 * address, we have to use multiple entries to perform the mapping.
827 unsigned long nr_zeros = __ffs64(cpu_addr);
828 u64 alignment = 1ULL << nr_zeros;
829 size = min(range->size, alignment);
833 /* Hardware supports max 4GiB inbound region */
834 size = min(size, 1ULL << 32);
836 mask = roundup_pow_of_two(size) - 1;
839 while (cpu_addr < cpu_end) {
841 * Set up 64-bit inbound regions as the range parser doesn't
842 * distinguish between 32 and 64-bit types.
844 pci_write_reg(pcie, lower_32_bits(pci_addr), PCIEPRAR(idx));
845 pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
846 pci_write_reg(pcie, lower_32_bits(mask) | flags, PCIELAMR(idx));
848 pci_write_reg(pcie, upper_32_bits(pci_addr), PCIEPRAR(idx+1));
849 pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx+1));
850 pci_write_reg(pcie, 0, PCIELAMR(idx+1));
856 if (idx > MAX_NR_INBOUND_MAPS) {
857 dev_err(pcie->dev, "Failed to map inbound regions!\n");
866 static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
867 struct device_node *node)
869 const int na = 3, ns = 2;
873 parser->pna = of_n_addr_cells(node);
874 parser->np = parser->pna + na + ns;
876 parser->range = of_get_property(node, "dma-ranges", &rlen);
880 parser->end = parser->range + rlen / sizeof(__be32);
884 static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
885 struct device_node *np)
887 struct of_pci_range range;
888 struct of_pci_range_parser parser;
892 if (pci_dma_range_parser_init(&parser, np))
895 /* Get the dma-ranges from DT */
896 for_each_of_pci_range(&parser, &range) {
897 u64 end = range.cpu_addr + range.size - 1;
898 dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
899 range.flags, range.cpu_addr, end, range.pci_addr);
901 err = rcar_pcie_inbound_ranges(pcie, &range, &index);
909 static const struct of_device_id rcar_pcie_of_match[] = {
910 { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
911 { .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init },
912 { .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init },
915 MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);
917 static int rcar_pcie_probe(struct platform_device *pdev)
919 struct rcar_pcie *pcie;
921 struct of_pci_range range;
922 struct of_pci_range_parser parser;
923 const struct of_device_id *of_id;
925 int (*hw_init_fn)(struct rcar_pcie *);
927 pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
931 pcie->dev = &pdev->dev;
932 platform_set_drvdata(pdev, pcie);
934 /* Get the bus range */
935 if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
936 dev_err(&pdev->dev, "failed to parse bus-range property\n");
940 if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) {
941 dev_err(&pdev->dev, "missing ranges property\n");
945 err = rcar_pcie_get_resources(pdev, pcie);
947 dev_err(&pdev->dev, "failed to request resources: %d\n", err);
951 for_each_of_pci_range(&parser, &range) {
952 of_pci_range_to_resource(&range, pdev->dev.of_node,
955 if (win > PCI_MAX_RESOURCES)
959 err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
963 if (IS_ENABLED(CONFIG_PCI_MSI)) {
964 err = rcar_pcie_enable_msi(pcie);
967 "failed to enable MSI support: %d\n",
973 of_id = of_match_device(rcar_pcie_of_match, pcie->dev);
974 if (!of_id || !of_id->data)
976 hw_init_fn = of_id->data;
978 /* Failure to get a link might just be that no cards are inserted */
979 err = hw_init_fn(pcie);
981 dev_info(&pdev->dev, "PCIe link down\n");
985 data = pci_read_reg(pcie, MACSR);
986 dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
988 rcar_pcie_enable(pcie);
993 static struct platform_driver rcar_pcie_driver = {
996 .owner = THIS_MODULE,
997 .of_match_table = rcar_pcie_of_match,
998 .suppress_bind_attrs = true,
1000 .probe = rcar_pcie_probe,
1002 module_platform_driver(rcar_pcie_driver);
1004 MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
1005 MODULE_DESCRIPTION("Renesas R-Car PCIe driver");
1006 MODULE_LICENSE("GPLv2");