2 * PCIe driver for Marvell Armada 370 and Armada XP SoCs
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/module.h>
15 #include <linux/mbus.h>
16 #include <linux/msi.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_address.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_pci.h>
23 #include <linux/of_platform.h>
26 * PCIe unit register offsets.
28 #define PCIE_DEV_ID_OFF 0x0000
29 #define PCIE_CMD_OFF 0x0004
30 #define PCIE_DEV_REV_OFF 0x0008
31 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
32 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
33 #define PCIE_HEADER_LOG_4_OFF 0x0128
34 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
35 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
36 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
37 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
38 #define PCIE_WIN5_CTRL_OFF 0x1880
39 #define PCIE_WIN5_BASE_OFF 0x1884
40 #define PCIE_WIN5_REMAP_OFF 0x188c
41 #define PCIE_CONF_ADDR_OFF 0x18f8
42 #define PCIE_CONF_ADDR_EN 0x80000000
43 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
44 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
45 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
46 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
47 #define PCIE_CONF_ADDR(bus, devfn, where) \
48 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
49 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
51 #define PCIE_CONF_DATA_OFF 0x18fc
52 #define PCIE_MASK_OFF 0x1910
53 #define PCIE_MASK_ENABLE_INTS 0x0f000000
54 #define PCIE_CTRL_OFF 0x1a00
55 #define PCIE_CTRL_X1_MODE 0x0001
56 #define PCIE_STAT_OFF 0x1a04
57 #define PCIE_STAT_BUS 0xff00
58 #define PCIE_STAT_DEV 0x1f0000
59 #define PCIE_STAT_LINK_DOWN BIT(0)
60 #define PCIE_DEBUG_CTRL 0x1a60
61 #define PCIE_DEBUG_SOFT_RESET BIT(20)
63 /* PCI configuration space of a PCI-to-PCI bridge */
64 struct mvebu_sw_pci_bridge {
79 u8 secondary_latency_timer;
96 struct mvebu_pcie_port;
98 /* Structure representing all PCIe interfaces */
100 struct platform_device *pdev;
101 struct mvebu_pcie_port *ports;
102 struct msi_chip *msi;
105 struct resource realio;
108 struct resource busn;
112 /* Structure representing one PCIe interface */
113 struct mvebu_pcie_port {
119 unsigned int mem_target;
120 unsigned int mem_attr;
121 unsigned int io_target;
122 unsigned int io_attr;
125 int reset_active_low;
127 struct mvebu_sw_pci_bridge bridge;
128 struct device_node *dn;
129 struct mvebu_pcie *pcie;
130 phys_addr_t memwin_base;
132 phys_addr_t iowin_base;
136 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
138 writel(val, port->base + reg);
141 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
143 return readl(port->base + reg);
146 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
148 return port->io_target != -1 && port->io_attr != -1;
151 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
153 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
156 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
160 stat = mvebu_readl(port, PCIE_STAT_OFF);
161 stat &= ~PCIE_STAT_BUS;
163 mvebu_writel(port, stat, PCIE_STAT_OFF);
166 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
170 stat = mvebu_readl(port, PCIE_STAT_OFF);
171 stat &= ~PCIE_STAT_DEV;
173 mvebu_writel(port, stat, PCIE_STAT_OFF);
177 * Setup PCIE BARs and Address Decode Wins:
178 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
179 * WIN[0-3] -> DRAM bank[0-3]
181 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
183 const struct mbus_dram_target_info *dram;
187 dram = mv_mbus_dram_info();
189 /* First, disable and clear BARs and windows. */
190 for (i = 1; i < 3; i++) {
191 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
192 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
193 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
196 for (i = 0; i < 5; i++) {
197 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
198 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
199 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
202 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
203 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
204 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
206 /* Setup windows for DDR banks. Count total DDR size on the fly. */
208 for (i = 0; i < dram->num_cs; i++) {
209 const struct mbus_dram_window *cs = dram->cs + i;
211 mvebu_writel(port, cs->base & 0xffff0000,
212 PCIE_WIN04_BASE_OFF(i));
213 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
215 ((cs->size - 1) & 0xffff0000) |
216 (cs->mbus_attr << 8) |
217 (dram->mbus_dram_target_id << 4) | 1,
218 PCIE_WIN04_CTRL_OFF(i));
223 /* Round up 'size' to the nearest power of two. */
224 if ((size & (size - 1)) != 0)
225 size = 1 << fls(size);
227 /* Setup BAR[1] to all DRAM banks. */
228 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
229 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
230 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
231 PCIE_BAR_CTRL_OFF(1));
234 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
238 /* Point PCIe unit MBUS decode windows to DRAM space. */
239 mvebu_pcie_setup_wins(port);
241 /* Master + slave enable. */
242 cmd = mvebu_readl(port, PCIE_CMD_OFF);
243 cmd |= PCI_COMMAND_IO;
244 cmd |= PCI_COMMAND_MEMORY;
245 cmd |= PCI_COMMAND_MASTER;
246 mvebu_writel(port, cmd, PCIE_CMD_OFF);
248 /* Enable interrupt lines A-D. */
249 mask = mvebu_readl(port, PCIE_MASK_OFF);
250 mask |= PCIE_MASK_ENABLE_INTS;
251 mvebu_writel(port, mask, PCIE_MASK_OFF);
254 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
256 u32 devfn, int where, int size, u32 *val)
258 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
261 *val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
264 *val = (*val >> (8 * (where & 3))) & 0xff;
266 *val = (*val >> (8 * (where & 3))) & 0xffff;
268 return PCIBIOS_SUCCESSFUL;
271 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
273 u32 devfn, int where, int size, u32 val)
275 u32 _val, shift = 8 * (where & 3);
277 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
279 _val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
284 _val = (_val & ~(0xffff << shift)) | ((val & 0xffff) << shift);
286 _val = (_val & ~(0xff << shift)) | ((val & 0xff) << shift);
288 return PCIBIOS_BAD_REGISTER_NUMBER;
290 mvebu_writel(port, _val, PCIE_CONF_DATA_OFF);
292 return PCIBIOS_SUCCESSFUL;
296 * Remove windows, starting from the largest ones to the smallest
299 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
300 phys_addr_t base, size_t size)
303 size_t sz = 1 << (fls(size) - 1);
305 mvebu_mbus_del_window(base, sz);
312 * MBus windows can only have a power of two size, but PCI BARs do not
313 * have this constraint. Therefore, we have to split the PCI BAR into
314 * areas each having a power of two size. We start from the largest
315 * one (i.e highest order bit set in the size).
317 static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
318 unsigned int target, unsigned int attribute,
319 phys_addr_t base, size_t size,
322 size_t size_mapped = 0;
325 size_t sz = 1 << (fls(size) - 1);
328 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
331 phys_addr_t end = base + sz - 1;
333 dev_err(&port->pcie->pdev->dev,
334 "Could not create MBus window at [mem %pa-%pa]: %d\n",
336 mvebu_pcie_del_windows(port, base - size_mapped,
344 if (remap != MVEBU_MBUS_NO_REMAP)
349 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
353 /* Are the new iobase/iolimit values invalid? */
354 if (port->bridge.iolimit < port->bridge.iobase ||
355 port->bridge.iolimitupper < port->bridge.iobaseupper ||
356 !(port->bridge.command & PCI_COMMAND_IO)) {
358 /* If a window was configured, remove it */
359 if (port->iowin_base) {
360 mvebu_pcie_del_windows(port, port->iowin_base,
362 port->iowin_base = 0;
363 port->iowin_size = 0;
369 if (!mvebu_has_ioport(port)) {
370 dev_WARN(&port->pcie->pdev->dev,
371 "Attempt to set IO when IO is disabled\n");
376 * We read the PCI-to-PCI bridge emulated registers, and
377 * calculate the base address and size of the address decoding
378 * window to setup, according to the PCI-to-PCI bridge
379 * specifications. iobase is the bus address, port->iowin_base
380 * is the CPU address.
382 iobase = ((port->bridge.iobase & 0xF0) << 8) |
383 (port->bridge.iobaseupper << 16);
384 port->iowin_base = port->pcie->io.start + iobase;
385 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
386 (port->bridge.iolimitupper << 16)) -
389 mvebu_pcie_add_windows(port, port->io_target, port->io_attr,
390 port->iowin_base, port->iowin_size,
394 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
396 /* Are the new membase/memlimit values invalid? */
397 if (port->bridge.memlimit < port->bridge.membase ||
398 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
400 /* If a window was configured, remove it */
401 if (port->memwin_base) {
402 mvebu_pcie_del_windows(port, port->memwin_base,
404 port->memwin_base = 0;
405 port->memwin_size = 0;
412 * We read the PCI-to-PCI bridge emulated registers, and
413 * calculate the base address and size of the address decoding
414 * window to setup, according to the PCI-to-PCI bridge
417 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
419 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
420 port->memwin_base + 1;
422 mvebu_pcie_add_windows(port, port->mem_target, port->mem_attr,
423 port->memwin_base, port->memwin_size,
424 MVEBU_MBUS_NO_REMAP);
428 * Initialize the configuration space of the PCI-to-PCI bridge
429 * associated with the given PCIe interface.
431 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
433 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
435 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
437 bridge->class = PCI_CLASS_BRIDGE_PCI;
438 bridge->vendor = PCI_VENDOR_ID_MARVELL;
439 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
440 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
441 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
442 bridge->cache_line_size = 0x10;
444 /* We support 32 bits I/O addressing */
445 bridge->iobase = PCI_IO_RANGE_TYPE_32;
446 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
450 * Read the configuration space of the PCI-to-PCI bridge associated to
451 * the given PCIe interface.
453 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
454 unsigned int where, int size, u32 *value)
456 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
458 switch (where & ~3) {
460 *value = bridge->device << 16 | bridge->vendor;
464 *value = bridge->command;
467 case PCI_CLASS_REVISION:
468 *value = bridge->class << 16 | bridge->interface << 8 |
472 case PCI_CACHE_LINE_SIZE:
473 *value = bridge->bist << 24 | bridge->header_type << 16 |
474 bridge->latency_timer << 8 | bridge->cache_line_size;
477 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
478 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
481 case PCI_PRIMARY_BUS:
482 *value = (bridge->secondary_latency_timer << 24 |
483 bridge->subordinate_bus << 16 |
484 bridge->secondary_bus << 8 |
485 bridge->primary_bus);
489 if (!mvebu_has_ioport(port))
490 *value = bridge->secondary_status << 16;
492 *value = (bridge->secondary_status << 16 |
493 bridge->iolimit << 8 |
497 case PCI_MEMORY_BASE:
498 *value = (bridge->memlimit << 16 | bridge->membase);
501 case PCI_PREF_MEMORY_BASE:
505 case PCI_IO_BASE_UPPER16:
506 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
509 case PCI_ROM_ADDRESS1:
513 case PCI_INTERRUPT_LINE:
514 /* LINE PIN MIN_GNT MAX_LAT */
520 return PCIBIOS_BAD_REGISTER_NUMBER;
524 *value = (*value >> (8 * (where & 3))) & 0xffff;
526 *value = (*value >> (8 * (where & 3))) & 0xff;
528 return PCIBIOS_SUCCESSFUL;
531 /* Write to the PCI-to-PCI bridge configuration space */
532 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
533 unsigned int where, int size, u32 value)
535 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
542 mask = ~(0xffff << ((where & 3) * 8));
544 mask = ~(0xff << ((where & 3) * 8));
546 return PCIBIOS_BAD_REGISTER_NUMBER;
548 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
552 value = (reg & mask) | value << ((where & 3) * 8);
554 switch (where & ~3) {
557 u32 old = bridge->command;
559 if (!mvebu_has_ioport(port))
560 value &= ~PCI_COMMAND_IO;
562 bridge->command = value & 0xffff;
563 if ((old ^ bridge->command) & PCI_COMMAND_IO)
564 mvebu_pcie_handle_iobase_change(port);
565 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
566 mvebu_pcie_handle_membase_change(port);
570 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
571 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
576 * We also keep bit 1 set, it is a read-only bit that
577 * indicates we support 32 bits addressing for the
580 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
581 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
582 mvebu_pcie_handle_iobase_change(port);
585 case PCI_MEMORY_BASE:
586 bridge->membase = value & 0xffff;
587 bridge->memlimit = value >> 16;
588 mvebu_pcie_handle_membase_change(port);
591 case PCI_IO_BASE_UPPER16:
592 bridge->iobaseupper = value & 0xffff;
593 bridge->iolimitupper = value >> 16;
594 mvebu_pcie_handle_iobase_change(port);
597 case PCI_PRIMARY_BUS:
598 bridge->primary_bus = value & 0xff;
599 bridge->secondary_bus = (value >> 8) & 0xff;
600 bridge->subordinate_bus = (value >> 16) & 0xff;
601 bridge->secondary_latency_timer = (value >> 24) & 0xff;
602 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
609 return PCIBIOS_SUCCESSFUL;
612 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
614 return sys->private_data;
617 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
623 for (i = 0; i < pcie->nports; i++) {
624 struct mvebu_pcie_port *port = &pcie->ports[i];
625 if (bus->number == 0 && port->devfn == devfn)
627 if (bus->number != 0 &&
628 bus->number >= port->bridge.secondary_bus &&
629 bus->number <= port->bridge.subordinate_bus)
636 /* PCI configuration space write function */
637 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
638 int where, int size, u32 val)
640 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
641 struct mvebu_pcie_port *port;
644 port = mvebu_pcie_find_port(pcie, bus, devfn);
646 return PCIBIOS_DEVICE_NOT_FOUND;
648 /* Access the emulated PCI-to-PCI bridge */
649 if (bus->number == 0)
650 return mvebu_sw_pci_bridge_write(port, where, size, val);
652 if (!mvebu_pcie_link_up(port))
653 return PCIBIOS_DEVICE_NOT_FOUND;
656 * On the secondary bus, we don't want to expose any other
657 * device than the device physically connected in the PCIe
658 * slot, visible in slot 0. In slot 1, there's a special
659 * Marvell device that only makes sense when the Armada is
660 * used as a PCIe endpoint.
662 if (bus->number == port->bridge.secondary_bus &&
663 PCI_SLOT(devfn) != 0)
664 return PCIBIOS_DEVICE_NOT_FOUND;
666 /* Access the real PCIe interface */
667 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
673 /* PCI configuration space read function */
674 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
677 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
678 struct mvebu_pcie_port *port;
681 port = mvebu_pcie_find_port(pcie, bus, devfn);
684 return PCIBIOS_DEVICE_NOT_FOUND;
687 /* Access the emulated PCI-to-PCI bridge */
688 if (bus->number == 0)
689 return mvebu_sw_pci_bridge_read(port, where, size, val);
691 if (!mvebu_pcie_link_up(port)) {
693 return PCIBIOS_DEVICE_NOT_FOUND;
697 * On the secondary bus, we don't want to expose any other
698 * device than the device physically connected in the PCIe
699 * slot, visible in slot 0. In slot 1, there's a special
700 * Marvell device that only makes sense when the Armada is
701 * used as a PCIe endpoint.
703 if (bus->number == port->bridge.secondary_bus &&
704 PCI_SLOT(devfn) != 0) {
706 return PCIBIOS_DEVICE_NOT_FOUND;
709 /* Access the real PCIe interface */
710 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
716 static struct pci_ops mvebu_pcie_ops = {
717 .read = mvebu_pcie_rd_conf,
718 .write = mvebu_pcie_wr_conf,
721 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
723 struct mvebu_pcie *pcie = sys_to_pcie(sys);
727 #ifdef CONFIG_PCI_DOMAINS
728 domain = sys->domain;
731 snprintf(pcie->mem_name, sizeof(pcie->mem_name), "PCI MEM %04x",
733 pcie->mem.name = pcie->mem_name;
735 snprintf(pcie->io_name, sizeof(pcie->io_name), "PCI I/O %04x", domain);
736 pcie->realio.name = pcie->io_name;
738 if (request_resource(&iomem_resource, &pcie->mem))
741 if (resource_size(&pcie->realio) != 0) {
742 if (request_resource(&ioport_resource, &pcie->realio)) {
743 release_resource(&pcie->mem);
746 pci_add_resource_offset(&sys->resources, &pcie->realio,
749 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
750 pci_add_resource(&sys->resources, &pcie->busn);
752 for (i = 0; i < pcie->nports; i++) {
753 struct mvebu_pcie_port *port = &pcie->ports[i];
756 mvebu_pcie_setup_hw(port);
762 static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
764 struct mvebu_pcie *pcie = sys_to_pcie(sys);
767 bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
768 &mvebu_pcie_ops, sys, &sys->resources);
772 pci_scan_child_bus(bus);
777 static void mvebu_pcie_add_bus(struct pci_bus *bus)
779 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
780 bus->msi = pcie->msi;
783 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
784 const struct resource *res,
785 resource_size_t start,
786 resource_size_t size,
787 resource_size_t align)
789 if (dev->bus->number != 0)
793 * On the PCI-to-PCI bridge side, the I/O windows must have at
794 * least a 64 KB size and the memory windows must have at
795 * least a 1 MB size. Moreover, MBus windows need to have a
796 * base address aligned on their size, and their size must be
797 * a power of two. This means that if the BAR doesn't have a
798 * power of two size, several MBus windows will actually be
799 * created. We need to ensure that the biggest MBus window
800 * (which will be the first one) is aligned on its size, which
801 * explains the rounddown_pow_of_two() being done here.
803 if (res->flags & IORESOURCE_IO)
804 return round_up(start, max_t(resource_size_t, SZ_64K,
805 rounddown_pow_of_two(size)));
806 else if (res->flags & IORESOURCE_MEM)
807 return round_up(start, max_t(resource_size_t, SZ_1M,
808 rounddown_pow_of_two(size)));
813 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
817 memset(&hw, 0, sizeof(hw));
819 hw.nr_controllers = 1;
820 hw.private_data = (void **)&pcie;
821 hw.setup = mvebu_pcie_setup;
822 hw.scan = mvebu_pcie_scan_bus;
823 hw.map_irq = of_irq_parse_and_map_pci;
824 hw.ops = &mvebu_pcie_ops;
825 hw.align_resource = mvebu_pcie_align_resource;
826 hw.add_bus = mvebu_pcie_add_bus;
828 pci_common_init(&hw);
832 * Looks up the list of register addresses encoded into the reg =
833 * <...> property for one that matches the given port/lane. Once
836 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
837 struct device_node *np,
838 struct mvebu_pcie_port *port)
840 struct resource regs;
843 ret = of_address_to_resource(np, 0, ®s);
847 return devm_ioremap_resource(&pdev->dev, ®s);
850 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
851 #define DT_TYPE_IO 0x1
852 #define DT_TYPE_MEM32 0x2
853 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
854 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
856 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
861 const int na = 3, ns = 2;
863 int rlen, nranges, rangesz, pna, i;
868 range = of_get_property(np, "ranges", &rlen);
872 pna = of_n_addr_cells(np);
873 rangesz = pna + na + ns;
874 nranges = rlen / sizeof(__be32) / rangesz;
876 for (i = 0; i < nranges; i++) {
877 u32 flags = of_read_number(range, 1);
878 u32 slot = of_read_number(range + 1, 1);
879 u64 cpuaddr = of_read_number(range + na, pna);
882 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
883 rtype = IORESOURCE_IO;
884 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
885 rtype = IORESOURCE_MEM;
887 if (slot == PCI_SLOT(devfn) && type == rtype) {
888 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
889 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
899 static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
901 struct device_node *msi_node;
903 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
908 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
911 pcie->msi->dev = &pcie->pdev->dev;
914 static int mvebu_pcie_probe(struct platform_device *pdev)
916 struct mvebu_pcie *pcie;
917 struct device_node *np = pdev->dev.of_node;
918 struct device_node *child;
921 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
927 platform_set_drvdata(pdev, pcie);
929 /* Get the PCIe memory and I/O aperture */
930 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
931 if (resource_size(&pcie->mem) == 0) {
932 dev_err(&pdev->dev, "invalid memory aperture size\n");
936 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
938 if (resource_size(&pcie->io) != 0) {
939 pcie->realio.flags = pcie->io.flags;
940 pcie->realio.start = PCIBIOS_MIN_IO;
941 pcie->realio.end = min_t(resource_size_t,
943 resource_size(&pcie->io));
945 pcie->realio = pcie->io;
947 /* Get the bus range */
948 ret = of_pci_parse_bus_range(np, &pcie->busn);
950 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
956 for_each_child_of_node(pdev->dev.of_node, child) {
957 if (!of_device_is_available(child))
962 pcie->ports = devm_kzalloc(&pdev->dev, i *
963 sizeof(struct mvebu_pcie_port),
969 for_each_child_of_node(pdev->dev.of_node, child) {
970 struct mvebu_pcie_port *port = &pcie->ports[i];
971 enum of_gpio_flags flags;
973 if (!of_device_is_available(child))
978 if (of_property_read_u32(child, "marvell,pcie-port",
981 "ignoring PCIe DT node, missing pcie-port property\n");
985 if (of_property_read_u32(child, "marvell,pcie-lane",
989 port->name = kasprintf(GFP_KERNEL, "pcie%d.%d",
990 port->port, port->lane);
992 port->devfn = of_pci_get_devfn(child);
996 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_MEM,
997 &port->mem_target, &port->mem_attr);
999 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for mem window\n",
1000 port->port, port->lane);
1004 if (resource_size(&pcie->io) != 0)
1005 mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_IO,
1006 &port->io_target, &port->io_attr);
1008 port->io_target = -1;
1012 port->reset_gpio = of_get_named_gpio_flags(child,
1013 "reset-gpios", 0, &flags);
1014 if (gpio_is_valid(port->reset_gpio)) {
1015 u32 reset_udelay = 20000;
1017 port->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
1018 port->reset_name = kasprintf(GFP_KERNEL,
1019 "pcie%d.%d-reset", port->port, port->lane);
1020 of_property_read_u32(child, "reset-delay-us",
1023 ret = devm_gpio_request_one(&pdev->dev,
1024 port->reset_gpio, GPIOF_DIR_OUT, port->reset_name);
1026 if (ret == -EPROBE_DEFER)
1031 gpio_set_value(port->reset_gpio,
1032 (port->reset_active_low) ? 1 : 0);
1033 msleep(reset_udelay/1000);
1036 port->clk = of_clk_get_by_name(child, NULL);
1037 if (IS_ERR(port->clk)) {
1038 dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
1039 port->port, port->lane);
1043 ret = clk_prepare_enable(port->clk);
1047 port->base = mvebu_pcie_map_registers(pdev, child, port);
1048 if (IS_ERR(port->base)) {
1049 dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
1050 port->port, port->lane);
1052 clk_disable_unprepare(port->clk);
1056 mvebu_pcie_set_local_dev_nr(port, 1);
1059 mvebu_sw_pci_bridge_init(port);
1065 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1066 pci_ioremap_io(i, pcie->io.start + i);
1068 mvebu_pcie_msi_enable(pcie);
1069 mvebu_pcie_enable(pcie);
1074 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1075 { .compatible = "marvell,armada-xp-pcie", },
1076 { .compatible = "marvell,armada-370-pcie", },
1077 { .compatible = "marvell,dove-pcie", },
1078 { .compatible = "marvell,kirkwood-pcie", },
1081 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
1083 static struct platform_driver mvebu_pcie_driver = {
1085 .owner = THIS_MODULE,
1086 .name = "mvebu-pcie",
1087 .of_match_table = mvebu_pcie_of_match_table,
1088 /* driver unloading/unbinding currently not supported */
1089 .suppress_bind_attrs = true,
1091 .probe = mvebu_pcie_probe,
1093 module_platform_driver(mvebu_pcie_driver);
1096 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
1097 MODULE_LICENSE("GPLv2");