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 * Author: Phil Edworthy <phil.edworthy@renesas.com>
12 * This file is licensed under the terms of the GNU General Public
13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or implied.
17 #include <linux/clk.h>
18 #include <linux/delay.h>
19 #include <linux/interrupt.h>
20 #include <linux/irq.h>
21 #include <linux/irqdomain.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/msi.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_pci.h>
28 #include <linux/of_platform.h>
29 #include <linux/pci.h>
30 #include <linux/platform_device.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/slab.h>
34 #define DRV_NAME "rcar-pcie"
36 #define PCIECAR 0x000010
37 #define PCIECCTLR 0x000018
38 #define CONFIG_SEND_ENABLE (1 << 31)
39 #define TYPE0 (0 << 8)
40 #define TYPE1 (1 << 8)
41 #define PCIECDR 0x000020
42 #define PCIEMSR 0x000028
43 #define PCIEINTXR 0x000400
44 #define PCIEMSITXR 0x000840
46 /* Transfer control */
47 #define PCIETCTLR 0x02000
49 #define PCIETSTR 0x02004
50 #define DATA_LINK_ACTIVE 1
51 #define PCIEERRFR 0x02020
52 #define UNSUPPORTED_REQUEST (1 << 4)
53 #define PCIEMSIFR 0x02044
54 #define PCIEMSIALR 0x02048
56 #define PCIEMSIAUR 0x0204c
57 #define PCIEMSIIER 0x02050
59 /* root port address */
60 #define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
62 /* local address reg & mask */
63 #define PCIELAR(x) (0x02200 + ((x) * 0x20))
64 #define PCIELAMR(x) (0x02208 + ((x) * 0x20))
65 #define LAM_PREFETCH (1 << 3)
66 #define LAM_64BIT (1 << 2)
67 #define LAR_ENABLE (1 << 1)
69 /* PCIe address reg & mask */
70 #define PCIEPALR(x) (0x03400 + ((x) * 0x20))
71 #define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
72 #define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
73 #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
74 #define PAR_ENABLE (1 << 31)
75 #define IO_SPACE (1 << 8)
78 #define PCICONF(x) (0x010000 + ((x) * 0x4))
79 #define PMCAP(x) (0x010040 + ((x) * 0x4))
80 #define EXPCAP(x) (0x010070 + ((x) * 0x4))
81 #define VCCAP(x) (0x010100 + ((x) * 0x4))
84 #define IDSETR1 0x011004
85 #define TLCTLR 0x011048
86 #define MACSR 0x011054
87 #define SPCHGFIN (1 << 4)
88 #define SPCHGFAIL (1 << 6)
89 #define SPCHGSUC (1 << 7)
90 #define LINK_SPEED (0xf << 16)
91 #define LINK_SPEED_2_5GTS (1 << 16)
92 #define LINK_SPEED_5_0GTS (2 << 16)
93 #define MACCTLR 0x011058
94 #define SPEED_CHANGE (1 << 24)
95 #define SCRAMBLE_DISABLE (1 << 27)
96 #define MACS2R 0x011078
97 #define MACCGSPSETR 0x011084
98 #define SPCNGRSN (1 << 31)
101 #define H1_PCIEPHYADRR 0x04000c
102 #define WRITE_CMD (1 << 16)
103 #define PHY_ACK (1 << 24)
107 #define H1_PCIEPHYDOUTR 0x040014
108 #define H1_PCIEPHYSR 0x040018
111 #define GEN2_PCIEPHYADDR 0x780
112 #define GEN2_PCIEPHYDATA 0x784
113 #define GEN2_PCIEPHYCTRL 0x78c
115 #define INT_PCI_MSI_NR 32
117 #define RCONF(x) (PCICONF(0)+(x))
118 #define RPMCAP(x) (PMCAP(0)+(x))
119 #define REXPCAP(x) (EXPCAP(0)+(x))
120 #define RVCCAP(x) (VCCAP(0)+(x))
122 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
123 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
124 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
126 #define RCAR_PCI_MAX_RESOURCES 4
127 #define MAX_NR_INBOUND_MAPS 6
130 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
131 struct irq_domain *domain;
132 struct msi_controller chip;
139 static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
141 return container_of(chip, struct rcar_msi, chip);
144 /* Structure representing the PCIe interface */
148 struct list_head resources;
155 static void rcar_pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
158 writel(val, pcie->base + reg);
161 static unsigned long rcar_pci_read_reg(struct rcar_pcie *pcie,
164 return readl(pcie->base + reg);
168 RCAR_PCI_ACCESS_READ,
169 RCAR_PCI_ACCESS_WRITE,
172 static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
174 int shift = 8 * (where & 3);
175 u32 val = rcar_pci_read_reg(pcie, where & ~3);
177 val &= ~(mask << shift);
178 val |= data << shift;
179 rcar_pci_write_reg(pcie, val, where & ~3);
182 static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
184 int shift = 8 * (where & 3);
185 u32 val = rcar_pci_read_reg(pcie, where & ~3);
190 /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
191 static int rcar_pcie_config_access(struct rcar_pcie *pcie,
192 unsigned char access_type, struct pci_bus *bus,
193 unsigned int devfn, int where, u32 *data)
195 int dev, func, reg, index;
197 dev = PCI_SLOT(devfn);
198 func = PCI_FUNC(devfn);
203 * While each channel has its own memory-mapped extended config
204 * space, it's generally only accessible when in endpoint mode.
205 * When in root complex mode, the controller is unable to target
206 * itself with either type 0 or type 1 accesses, and indeed, any
207 * controller initiated target transfer to its own config space
208 * result in a completer abort.
210 * Each channel effectively only supports a single device, but as
211 * the same channel <-> device access works for any PCI_SLOT()
212 * value, we cheat a bit here and bind the controller's config
213 * space to devfn 0 in order to enable self-enumeration. In this
214 * case the regular ECAR/ECDR path is sidelined and the mangled
215 * config access itself is initiated as an internal bus transaction.
217 if (pci_is_root_bus(bus)) {
219 return PCIBIOS_DEVICE_NOT_FOUND;
221 if (access_type == RCAR_PCI_ACCESS_READ) {
222 *data = rcar_pci_read_reg(pcie, PCICONF(index));
224 /* Keep an eye out for changes to the root bus number */
225 if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
226 pcie->root_bus_nr = *data & 0xff;
228 rcar_pci_write_reg(pcie, *data, PCICONF(index));
231 return PCIBIOS_SUCCESSFUL;
234 if (pcie->root_bus_nr < 0)
235 return PCIBIOS_DEVICE_NOT_FOUND;
238 rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
240 /* Set the PIO address */
241 rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
242 PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);
244 /* Enable the configuration access */
245 if (bus->parent->number == pcie->root_bus_nr)
246 rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
248 rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
250 /* Check for errors */
251 if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
252 return PCIBIOS_DEVICE_NOT_FOUND;
254 /* Check for master and target aborts */
255 if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
256 (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
257 return PCIBIOS_DEVICE_NOT_FOUND;
259 if (access_type == RCAR_PCI_ACCESS_READ)
260 *data = rcar_pci_read_reg(pcie, PCIECDR);
262 rcar_pci_write_reg(pcie, *data, PCIECDR);
264 /* Disable the configuration access */
265 rcar_pci_write_reg(pcie, 0, PCIECCTLR);
267 return PCIBIOS_SUCCESSFUL;
270 static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
271 int where, int size, u32 *val)
273 struct rcar_pcie *pcie = bus->sysdata;
276 ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
277 bus, devfn, where, val);
278 if (ret != PCIBIOS_SUCCESSFUL) {
284 *val = (*val >> (8 * (where & 3))) & 0xff;
286 *val = (*val >> (8 * (where & 2))) & 0xffff;
288 dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
289 bus->number, devfn, where, size, (unsigned long)*val);
294 /* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
295 static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
296 int where, int size, u32 val)
298 struct rcar_pcie *pcie = bus->sysdata;
302 ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
303 bus, devfn, where, &data);
304 if (ret != PCIBIOS_SUCCESSFUL)
307 dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
308 bus->number, devfn, where, size, (unsigned long)val);
311 shift = 8 * (where & 3);
312 data &= ~(0xff << shift);
313 data |= ((val & 0xff) << shift);
314 } else if (size == 2) {
315 shift = 8 * (where & 2);
316 data &= ~(0xffff << shift);
317 data |= ((val & 0xffff) << shift);
321 ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_WRITE,
322 bus, devfn, where, &data);
327 static struct pci_ops rcar_pcie_ops = {
328 .read = rcar_pcie_read_conf,
329 .write = rcar_pcie_write_conf,
332 static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie,
333 struct resource *res)
335 /* Setup PCIe address space mappings for each resource */
336 resource_size_t size;
337 resource_size_t res_start;
340 rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
343 * The PAMR mask is calculated in units of 128Bytes, which
344 * keeps things pretty simple.
346 size = resource_size(res);
347 mask = (roundup_pow_of_two(size) / SZ_128) - 1;
348 rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
350 if (res->flags & IORESOURCE_IO)
351 res_start = pci_pio_to_address(res->start);
353 res_start = res->start;
355 rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
356 rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
359 /* First resource is for IO */
361 if (res->flags & IORESOURCE_IO)
364 rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
367 static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci)
369 struct resource_entry *win;
372 /* Setup PCI resources */
373 resource_list_for_each_entry(win, &pci->resources) {
374 struct resource *res = win->res;
379 switch (resource_type(res)) {
382 rcar_pcie_setup_window(i, pci, res);
386 pci->root_bus_nr = res->start;
392 pci_add_resource(resource, res);
398 static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
400 unsigned int timeout = 1000;
403 if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS)
406 if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) {
407 dev_err(pcie->dev, "Speed change already in progress\n");
411 macsr = rcar_pci_read_reg(pcie, MACSR);
412 if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS)
415 /* Set target link speed to 5.0 GT/s */
416 rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS,
417 PCI_EXP_LNKSTA_CLS_5_0GB);
419 /* Set speed change reason as intentional factor */
420 rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0);
422 /* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */
423 if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL))
424 rcar_pci_write_reg(pcie, macsr, MACSR);
426 /* Start link speed change */
427 rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE);
430 macsr = rcar_pci_read_reg(pcie, MACSR);
431 if (macsr & SPCHGFIN) {
432 /* Clear the interrupt bits */
433 rcar_pci_write_reg(pcie, macsr, MACSR);
435 if (macsr & SPCHGFAIL)
436 dev_err(pcie->dev, "Speed change failed\n");
444 dev_err(pcie->dev, "Speed change timed out\n");
447 dev_info(pcie->dev, "Current link speed is %s GT/s\n",
448 (macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5");
451 static int rcar_pcie_enable(struct rcar_pcie *pcie)
453 struct pci_bus *bus, *child;
456 /* Try setting 5 GT/s link speed */
457 rcar_pcie_force_speedup(pcie);
459 rcar_pcie_setup(&res, pcie);
461 pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
463 if (IS_ENABLED(CONFIG_PCI_MSI))
464 bus = pci_scan_root_bus_msi(pcie->dev, pcie->root_bus_nr,
465 &rcar_pcie_ops, pcie, &res, &pcie->msi.chip);
467 bus = pci_scan_root_bus(pcie->dev, pcie->root_bus_nr,
468 &rcar_pcie_ops, pcie, &res);
471 dev_err(pcie->dev, "Scanning rootbus failed");
475 pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
477 pci_bus_size_bridges(bus);
478 pci_bus_assign_resources(bus);
480 list_for_each_entry(child, &bus->children, node)
481 pcie_bus_configure_settings(child);
483 pci_bus_add_devices(bus);
488 static int phy_wait_for_ack(struct rcar_pcie *pcie)
490 unsigned int timeout = 100;
493 if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
499 dev_err(pcie->dev, "Access to PCIe phy timed out\n");
504 static void phy_write_reg(struct rcar_pcie *pcie,
505 unsigned int rate, unsigned int addr,
506 unsigned int lane, unsigned int data)
508 unsigned long phyaddr;
510 phyaddr = WRITE_CMD |
511 ((rate & 1) << RATE_POS) |
512 ((lane & 0xf) << LANE_POS) |
513 ((addr & 0xff) << ADR_POS);
516 rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
517 rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
519 /* Ignore errors as they will be dealt with if the data link is down */
520 phy_wait_for_ack(pcie);
523 rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
524 rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
526 /* Ignore errors as they will be dealt with if the data link is down */
527 phy_wait_for_ack(pcie);
530 static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
532 unsigned int timeout = 10;
535 if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
544 static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
548 /* Begin initialization */
549 rcar_pci_write_reg(pcie, 0, PCIETCTLR);
552 rcar_pci_write_reg(pcie, 1, PCIEMSR);
555 * Initial header for port config space is type 1, set the device
556 * class to match. Hardware takes care of propagating the IDSETR
557 * settings, so there is no need to bother with a quirk.
559 rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);
562 * Setup Secondary Bus Number & Subordinate Bus Number, even though
563 * they aren't used, to avoid bridge being detected as broken.
565 rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
566 rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
568 /* Initialize default capabilities. */
569 rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
570 rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
571 PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
572 rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
573 PCI_HEADER_TYPE_BRIDGE);
575 /* Enable data link layer active state reporting */
576 rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
577 PCI_EXP_LNKCAP_DLLLARC);
579 /* Write out the physical slot number = 0 */
580 rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
582 /* Set the completion timer timeout to the maximum 50ms. */
583 rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);
585 /* Terminate list of capabilities (Next Capability Offset=0) */
586 rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);
589 if (IS_ENABLED(CONFIG_PCI_MSI))
590 rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);
592 /* Finish initialization - establish a PCI Express link */
593 rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
595 /* This will timeout if we don't have a link. */
596 err = rcar_pcie_wait_for_dl(pcie);
600 /* Enable INTx interrupts */
601 rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
608 static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie)
610 unsigned int timeout = 10;
612 /* Initialize the phy */
613 phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
614 phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
615 phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
616 phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
617 phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
618 phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
619 phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
620 phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
621 phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
622 phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
623 phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
624 phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
626 phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
627 phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
628 phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
631 if (rcar_pci_read_reg(pcie, H1_PCIEPHYSR))
632 return rcar_pcie_hw_init(pcie);
640 static int rcar_pcie_hw_init_gen2(struct rcar_pcie *pcie)
643 * These settings come from the R-Car Series, 2nd Generation User's
644 * Manual, section 50.3.1 (2) Initialization of the physical layer.
646 rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR);
647 rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA);
648 rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
649 rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
651 rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR);
652 /* The following value is for DC connection, no termination resistor */
653 rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA);
654 rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
655 rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
657 return rcar_pcie_hw_init(pcie);
660 static int rcar_msi_alloc(struct rcar_msi *chip)
664 mutex_lock(&chip->lock);
666 msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
667 if (msi < INT_PCI_MSI_NR)
668 set_bit(msi, chip->used);
672 mutex_unlock(&chip->lock);
677 static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs)
681 mutex_lock(&chip->lock);
682 msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR,
683 order_base_2(no_irqs));
684 mutex_unlock(&chip->lock);
689 static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
691 mutex_lock(&chip->lock);
692 clear_bit(irq, chip->used);
693 mutex_unlock(&chip->lock);
696 static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
698 struct rcar_pcie *pcie = data;
699 struct rcar_msi *msi = &pcie->msi;
702 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
704 /* MSI & INTx share an interrupt - we only handle MSI here */
709 unsigned int index = find_first_bit(®, 32);
712 /* clear the interrupt */
713 rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
715 irq = irq_find_mapping(msi->domain, index);
717 if (test_bit(index, msi->used))
718 generic_handle_irq(irq);
720 dev_info(pcie->dev, "unhandled MSI\n");
722 /* Unknown MSI, just clear it */
723 dev_dbg(pcie->dev, "unexpected MSI\n");
726 /* see if there's any more pending in this vector */
727 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
733 static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
734 struct msi_desc *desc)
736 struct rcar_msi *msi = to_rcar_msi(chip);
737 struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
742 hwirq = rcar_msi_alloc(msi);
746 irq = irq_find_mapping(msi->domain, hwirq);
748 rcar_msi_free(msi, hwirq);
752 irq_set_msi_desc(irq, desc);
754 msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
755 msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
758 pci_write_msi_msg(irq, &msg);
763 static int rcar_msi_setup_irqs(struct msi_controller *chip,
764 struct pci_dev *pdev, int nvec, int type)
766 struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
767 struct rcar_msi *msi = to_rcar_msi(chip);
768 struct msi_desc *desc;
774 /* MSI-X interrupts are not supported */
775 if (type == PCI_CAP_ID_MSIX)
778 WARN_ON(!list_is_singular(&pdev->dev.msi_list));
779 desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
781 hwirq = rcar_msi_alloc_region(msi, nvec);
785 irq = irq_find_mapping(msi->domain, hwirq);
789 for (i = 0; i < nvec; i++) {
791 * irq_create_mapping() called from rcar_pcie_probe() pre-
792 * allocates descs, so there is no need to allocate descs here.
793 * We can therefore assume that if irq_find_mapping() above
794 * returns non-zero, then the descs are also successfully
797 if (irq_set_msi_desc_off(irq, i, desc)) {
803 desc->nvec_used = nvec;
804 desc->msi_attrib.multiple = order_base_2(nvec);
806 msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
807 msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
810 pci_write_msi_msg(irq, &msg);
815 static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
817 struct rcar_msi *msi = to_rcar_msi(chip);
818 struct irq_data *d = irq_get_irq_data(irq);
820 rcar_msi_free(msi, d->hwirq);
823 static struct irq_chip rcar_msi_irq_chip = {
824 .name = "R-Car PCIe MSI",
825 .irq_enable = pci_msi_unmask_irq,
826 .irq_disable = pci_msi_mask_irq,
827 .irq_mask = pci_msi_mask_irq,
828 .irq_unmask = pci_msi_unmask_irq,
831 static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
832 irq_hw_number_t hwirq)
834 irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
835 irq_set_chip_data(irq, domain->host_data);
840 static const struct irq_domain_ops msi_domain_ops = {
844 static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
846 struct platform_device *pdev = to_platform_device(pcie->dev);
847 struct rcar_msi *msi = &pcie->msi;
851 mutex_init(&msi->lock);
853 msi->chip.dev = pcie->dev;
854 msi->chip.setup_irq = rcar_msi_setup_irq;
855 msi->chip.setup_irqs = rcar_msi_setup_irqs;
856 msi->chip.teardown_irq = rcar_msi_teardown_irq;
858 msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
859 &msi_domain_ops, &msi->chip);
861 dev_err(&pdev->dev, "failed to create IRQ domain\n");
865 for (i = 0; i < INT_PCI_MSI_NR; i++)
866 irq_create_mapping(msi->domain, i);
868 /* Two irqs are for MSI, but they are also used for non-MSI irqs */
869 err = devm_request_irq(&pdev->dev, msi->irq1, rcar_pcie_msi_irq,
870 IRQF_SHARED | IRQF_NO_THREAD,
871 rcar_msi_irq_chip.name, pcie);
873 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
877 err = devm_request_irq(&pdev->dev, msi->irq2, rcar_pcie_msi_irq,
878 IRQF_SHARED | IRQF_NO_THREAD,
879 rcar_msi_irq_chip.name, pcie);
881 dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
885 /* setup MSI data target */
886 msi->pages = __get_free_pages(GFP_KERNEL, 0);
887 base = virt_to_phys((void *)msi->pages);
889 rcar_pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
890 rcar_pci_write_reg(pcie, 0, PCIEMSIAUR);
892 /* enable all MSI interrupts */
893 rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
898 irq_domain_remove(msi->domain);
902 static int rcar_pcie_get_resources(struct platform_device *pdev,
903 struct rcar_pcie *pcie)
908 err = of_address_to_resource(pdev->dev.of_node, 0, &res);
912 pcie->base = devm_ioremap_resource(&pdev->dev, &res);
913 if (IS_ERR(pcie->base))
914 return PTR_ERR(pcie->base);
916 pcie->clk = devm_clk_get(&pdev->dev, "pcie");
917 if (IS_ERR(pcie->clk)) {
918 dev_err(pcie->dev, "cannot get platform clock\n");
919 return PTR_ERR(pcie->clk);
921 err = clk_prepare_enable(pcie->clk);
925 pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
926 if (IS_ERR(pcie->bus_clk)) {
927 dev_err(pcie->dev, "cannot get pcie bus clock\n");
928 err = PTR_ERR(pcie->bus_clk);
931 err = clk_prepare_enable(pcie->bus_clk);
935 i = irq_of_parse_and_map(pdev->dev.of_node, 0);
937 dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
943 i = irq_of_parse_and_map(pdev->dev.of_node, 1);
945 dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
954 clk_disable_unprepare(pcie->bus_clk);
956 clk_disable_unprepare(pcie->clk);
961 static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
962 struct of_pci_range *range,
965 u64 restype = range->flags;
966 u64 cpu_addr = range->cpu_addr;
967 u64 cpu_end = range->cpu_addr + range->size;
968 u64 pci_addr = range->pci_addr;
969 u32 flags = LAM_64BIT | LAR_ENABLE;
974 if (restype & IORESOURCE_PREFETCH)
975 flags |= LAM_PREFETCH;
978 * If the size of the range is larger than the alignment of the start
979 * address, we have to use multiple entries to perform the mapping.
982 unsigned long nr_zeros = __ffs64(cpu_addr);
983 u64 alignment = 1ULL << nr_zeros;
985 size = min(range->size, alignment);
989 /* Hardware supports max 4GiB inbound region */
990 size = min(size, 1ULL << 32);
992 mask = roundup_pow_of_two(size) - 1;
995 while (cpu_addr < cpu_end) {
997 * Set up 64-bit inbound regions as the range parser doesn't
998 * distinguish between 32 and 64-bit types.
1000 rcar_pci_write_reg(pcie, lower_32_bits(pci_addr),
1002 rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
1003 rcar_pci_write_reg(pcie, lower_32_bits(mask) | flags,
1006 rcar_pci_write_reg(pcie, upper_32_bits(pci_addr),
1008 rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr),
1010 rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));
1016 if (idx > MAX_NR_INBOUND_MAPS) {
1017 dev_err(pcie->dev, "Failed to map inbound regions!\n");
1026 static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
1027 struct device_node *node)
1029 const int na = 3, ns = 2;
1032 parser->node = node;
1033 parser->pna = of_n_addr_cells(node);
1034 parser->np = parser->pna + na + ns;
1036 parser->range = of_get_property(node, "dma-ranges", &rlen);
1040 parser->end = parser->range + rlen / sizeof(__be32);
1044 static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
1045 struct device_node *np)
1047 struct of_pci_range range;
1048 struct of_pci_range_parser parser;
1052 if (pci_dma_range_parser_init(&parser, np))
1055 /* Get the dma-ranges from DT */
1056 for_each_of_pci_range(&parser, &range) {
1057 u64 end = range.cpu_addr + range.size - 1;
1059 dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
1060 range.flags, range.cpu_addr, end, range.pci_addr);
1062 err = rcar_pcie_inbound_ranges(pcie, &range, &index);
1070 static const struct of_device_id rcar_pcie_of_match[] = {
1071 { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
1072 { .compatible = "renesas,pcie-rcar-gen2",
1073 .data = rcar_pcie_hw_init_gen2 },
1074 { .compatible = "renesas,pcie-r8a7790",
1075 .data = rcar_pcie_hw_init_gen2 },
1076 { .compatible = "renesas,pcie-r8a7791",
1077 .data = rcar_pcie_hw_init_gen2 },
1078 { .compatible = "renesas,pcie-r8a7795", .data = rcar_pcie_hw_init },
1082 static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci)
1085 struct device *dev = pci->dev;
1086 struct device_node *np = dev->of_node;
1087 resource_size_t iobase;
1088 struct resource_entry *win, *tmp;
1090 err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources,
1095 err = devm_request_pci_bus_resources(dev, &pci->resources);
1097 goto out_release_res;
1099 resource_list_for_each_entry_safe(win, tmp, &pci->resources) {
1100 struct resource *res = win->res;
1102 if (resource_type(res) == IORESOURCE_IO) {
1103 err = pci_remap_iospace(res, iobase);
1105 dev_warn(dev, "error %d: failed to map resource %pR\n",
1108 resource_list_destroy_entry(win);
1116 pci_free_resource_list(&pci->resources);
1120 static int rcar_pcie_probe(struct platform_device *pdev)
1122 struct rcar_pcie *pcie;
1124 const struct of_device_id *of_id;
1126 int (*hw_init_fn)(struct rcar_pcie *);
1128 pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
1132 pcie->dev = &pdev->dev;
1133 platform_set_drvdata(pdev, pcie);
1135 INIT_LIST_HEAD(&pcie->resources);
1137 rcar_pcie_parse_request_of_pci_ranges(pcie);
1139 err = rcar_pcie_get_resources(pdev, pcie);
1141 dev_err(&pdev->dev, "failed to request resources: %d\n", err);
1145 err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
1149 of_id = of_match_device(rcar_pcie_of_match, pcie->dev);
1150 if (!of_id || !of_id->data)
1152 hw_init_fn = of_id->data;
1154 pm_runtime_enable(pcie->dev);
1155 err = pm_runtime_get_sync(pcie->dev);
1157 dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
1158 goto err_pm_disable;
1161 /* Failure to get a link might just be that no cards are inserted */
1162 err = hw_init_fn(pcie);
1164 dev_info(&pdev->dev, "PCIe link down\n");
1169 data = rcar_pci_read_reg(pcie, MACSR);
1170 dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
1172 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1173 err = rcar_pcie_enable_msi(pcie);
1176 "failed to enable MSI support: %d\n",
1182 err = rcar_pcie_enable(pcie);
1189 pm_runtime_put(pcie->dev);
1192 pm_runtime_disable(pcie->dev);
1196 static struct platform_driver rcar_pcie_driver = {
1199 .of_match_table = rcar_pcie_of_match,
1200 .suppress_bind_attrs = true,
1202 .probe = rcar_pcie_probe,
1204 builtin_platform_driver(rcar_pcie_driver);