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");