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/module.h>
13 #include <linux/mbus.h>
14 #include <linux/slab.h>
15 #include <linux/platform_device.h>
16 #include <linux/of_address.h>
17 #include <linux/of_pci.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_platform.h>
22 * PCIe unit register offsets.
24 #define PCIE_DEV_ID_OFF 0x0000
25 #define PCIE_CMD_OFF 0x0004
26 #define PCIE_DEV_REV_OFF 0x0008
27 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
28 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
29 #define PCIE_HEADER_LOG_4_OFF 0x0128
30 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
31 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
32 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
33 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
34 #define PCIE_WIN5_CTRL_OFF 0x1880
35 #define PCIE_WIN5_BASE_OFF 0x1884
36 #define PCIE_WIN5_REMAP_OFF 0x188c
37 #define PCIE_CONF_ADDR_OFF 0x18f8
38 #define PCIE_CONF_ADDR_EN 0x80000000
39 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
40 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
41 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
42 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
43 #define PCIE_CONF_ADDR(bus, devfn, where) \
44 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
45 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
47 #define PCIE_CONF_DATA_OFF 0x18fc
48 #define PCIE_MASK_OFF 0x1910
49 #define PCIE_MASK_ENABLE_INTS 0x0f000000
50 #define PCIE_CTRL_OFF 0x1a00
51 #define PCIE_CTRL_X1_MODE 0x0001
52 #define PCIE_STAT_OFF 0x1a04
53 #define PCIE_STAT_BUS 0xff00
54 #define PCIE_STAT_DEV 0x1f0000
55 #define PCIE_STAT_LINK_DOWN BIT(0)
56 #define PCIE_DEBUG_CTRL 0x1a60
57 #define PCIE_DEBUG_SOFT_RESET BIT(20)
60 * This product ID is registered by Marvell, and used when the Marvell
61 * SoC is not the root complex, but an endpoint on the PCIe bus. It is
62 * therefore safe to re-use this PCI ID for our emulated PCI-to-PCI
65 #define MARVELL_EMULATED_PCI_PCI_BRIDGE_ID 0x7846
67 /* PCI configuration space of a PCI-to-PCI bridge */
68 struct mvebu_sw_pci_bridge {
83 u8 secondary_latency_timer;
104 struct mvebu_pcie_port;
106 /* Structure representing all PCIe interfaces */
108 struct platform_device *pdev;
109 struct mvebu_pcie_port *ports;
111 struct resource realio;
113 struct resource busn;
117 /* Structure representing one PCIe interface */
118 struct mvebu_pcie_port {
121 spinlock_t conf_lock;
126 unsigned int mem_target;
127 unsigned int mem_attr;
128 unsigned int io_target;
129 unsigned int io_attr;
131 struct mvebu_sw_pci_bridge bridge;
132 struct device_node *dn;
133 struct mvebu_pcie *pcie;
134 phys_addr_t memwin_base;
136 phys_addr_t iowin_base;
140 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
142 return !(readl(port->base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
145 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
149 stat = readl(port->base + PCIE_STAT_OFF);
150 stat &= ~PCIE_STAT_BUS;
152 writel(stat, port->base + PCIE_STAT_OFF);
155 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
159 stat = readl(port->base + PCIE_STAT_OFF);
160 stat &= ~PCIE_STAT_DEV;
162 writel(stat, port->base + PCIE_STAT_OFF);
166 * Setup PCIE BARs and Address Decode Wins:
167 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
168 * WIN[0-3] -> DRAM bank[0-3]
170 static void __init mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
172 const struct mbus_dram_target_info *dram;
176 dram = mv_mbus_dram_info();
178 /* First, disable and clear BARs and windows. */
179 for (i = 1; i < 3; i++) {
180 writel(0, port->base + PCIE_BAR_CTRL_OFF(i));
181 writel(0, port->base + PCIE_BAR_LO_OFF(i));
182 writel(0, port->base + PCIE_BAR_HI_OFF(i));
185 for (i = 0; i < 5; i++) {
186 writel(0, port->base + PCIE_WIN04_CTRL_OFF(i));
187 writel(0, port->base + PCIE_WIN04_BASE_OFF(i));
188 writel(0, port->base + PCIE_WIN04_REMAP_OFF(i));
191 writel(0, port->base + PCIE_WIN5_CTRL_OFF);
192 writel(0, port->base + PCIE_WIN5_BASE_OFF);
193 writel(0, port->base + PCIE_WIN5_REMAP_OFF);
195 /* Setup windows for DDR banks. Count total DDR size on the fly. */
197 for (i = 0; i < dram->num_cs; i++) {
198 const struct mbus_dram_window *cs = dram->cs + i;
200 writel(cs->base & 0xffff0000,
201 port->base + PCIE_WIN04_BASE_OFF(i));
202 writel(0, port->base + PCIE_WIN04_REMAP_OFF(i));
203 writel(((cs->size - 1) & 0xffff0000) |
204 (cs->mbus_attr << 8) |
205 (dram->mbus_dram_target_id << 4) | 1,
206 port->base + PCIE_WIN04_CTRL_OFF(i));
211 /* Round up 'size' to the nearest power of two. */
212 if ((size & (size - 1)) != 0)
213 size = 1 << fls(size);
215 /* Setup BAR[1] to all DRAM banks. */
216 writel(dram->cs[0].base, port->base + PCIE_BAR_LO_OFF(1));
217 writel(0, port->base + PCIE_BAR_HI_OFF(1));
218 writel(((size - 1) & 0xffff0000) | 1,
219 port->base + PCIE_BAR_CTRL_OFF(1));
222 static void __init mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
227 /* Point PCIe unit MBUS decode windows to DRAM space. */
228 mvebu_pcie_setup_wins(port);
230 /* Master + slave enable. */
231 cmd = readw(port->base + PCIE_CMD_OFF);
232 cmd |= PCI_COMMAND_IO;
233 cmd |= PCI_COMMAND_MEMORY;
234 cmd |= PCI_COMMAND_MASTER;
235 writew(cmd, port->base + PCIE_CMD_OFF);
237 /* Enable interrupt lines A-D. */
238 mask = readl(port->base + PCIE_MASK_OFF);
239 mask |= PCIE_MASK_ENABLE_INTS;
240 writel(mask, port->base + PCIE_MASK_OFF);
243 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
245 u32 devfn, int where, int size, u32 *val)
247 writel(PCIE_CONF_ADDR(bus->number, devfn, where),
248 port->base + PCIE_CONF_ADDR_OFF);
250 *val = readl(port->base + PCIE_CONF_DATA_OFF);
253 *val = (*val >> (8 * (where & 3))) & 0xff;
255 *val = (*val >> (8 * (where & 3))) & 0xffff;
257 return PCIBIOS_SUCCESSFUL;
260 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
262 u32 devfn, int where, int size, u32 val)
264 int ret = PCIBIOS_SUCCESSFUL;
266 writel(PCIE_CONF_ADDR(bus->number, devfn, where),
267 port->base + PCIE_CONF_ADDR_OFF);
270 writel(val, port->base + PCIE_CONF_DATA_OFF);
272 writew(val, port->base + PCIE_CONF_DATA_OFF + (where & 3));
274 writeb(val, port->base + PCIE_CONF_DATA_OFF + (where & 3));
276 ret = PCIBIOS_BAD_REGISTER_NUMBER;
281 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
285 /* Are the new iobase/iolimit values invalid? */
286 if (port->bridge.iolimit < port->bridge.iobase ||
287 port->bridge.iolimitupper < port->bridge.iobaseupper) {
289 /* If a window was configured, remove it */
290 if (port->iowin_base) {
291 mvebu_mbus_del_window(port->iowin_base,
293 port->iowin_base = 0;
294 port->iowin_size = 0;
301 * We read the PCI-to-PCI bridge emulated registers, and
302 * calculate the base address and size of the address decoding
303 * window to setup, according to the PCI-to-PCI bridge
304 * specifications. iobase is the bus address, port->iowin_base
305 * is the CPU address.
307 iobase = ((port->bridge.iobase & 0xF0) << 8) |
308 (port->bridge.iobaseupper << 16);
309 port->iowin_base = port->pcie->io.start + iobase;
310 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
311 (port->bridge.iolimitupper << 16)) -
314 mvebu_mbus_add_window_remap_by_id(port->io_target, port->io_attr,
315 port->iowin_base, port->iowin_size,
318 pci_ioremap_io(iobase, port->iowin_base);
321 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
323 /* Are the new membase/memlimit values invalid? */
324 if (port->bridge.memlimit < port->bridge.membase) {
326 /* If a window was configured, remove it */
327 if (port->memwin_base) {
328 mvebu_mbus_del_window(port->memwin_base,
330 port->memwin_base = 0;
331 port->memwin_size = 0;
338 * We read the PCI-to-PCI bridge emulated registers, and
339 * calculate the base address and size of the address decoding
340 * window to setup, according to the PCI-to-PCI bridge
343 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
345 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
348 mvebu_mbus_add_window_by_id(port->mem_target, port->mem_attr,
349 port->memwin_base, port->memwin_size);
353 * Initialize the configuration space of the PCI-to-PCI bridge
354 * associated with the given PCIe interface.
356 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
358 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
360 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
362 bridge->class = PCI_CLASS_BRIDGE_PCI;
363 bridge->vendor = PCI_VENDOR_ID_MARVELL;
364 bridge->device = MARVELL_EMULATED_PCI_PCI_BRIDGE_ID;
365 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
366 bridge->cache_line_size = 0x10;
368 /* We support 32 bits I/O addressing */
369 bridge->iobase = PCI_IO_RANGE_TYPE_32;
370 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
374 * Read the configuration space of the PCI-to-PCI bridge associated to
375 * the given PCIe interface.
377 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
378 unsigned int where, int size, u32 *value)
380 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
382 switch (where & ~3) {
384 *value = bridge->device << 16 | bridge->vendor;
388 *value = bridge->command;
391 case PCI_CLASS_REVISION:
392 *value = bridge->class << 16 | bridge->interface << 8 |
396 case PCI_CACHE_LINE_SIZE:
397 *value = bridge->bist << 24 | bridge->header_type << 16 |
398 bridge->latency_timer << 8 | bridge->cache_line_size;
401 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
402 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
405 case PCI_PRIMARY_BUS:
406 *value = (bridge->secondary_latency_timer << 24 |
407 bridge->subordinate_bus << 16 |
408 bridge->secondary_bus << 8 |
409 bridge->primary_bus);
413 *value = (bridge->secondary_status << 16 |
414 bridge->iolimit << 8 |
418 case PCI_MEMORY_BASE:
419 *value = (bridge->memlimit << 16 | bridge->membase);
422 case PCI_PREF_MEMORY_BASE:
423 *value = (bridge->prefmemlimit << 16 | bridge->prefmembase);
426 case PCI_PREF_BASE_UPPER32:
427 *value = bridge->prefbaseupper;
430 case PCI_PREF_LIMIT_UPPER32:
431 *value = bridge->preflimitupper;
434 case PCI_IO_BASE_UPPER16:
435 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
438 case PCI_ROM_ADDRESS1:
444 return PCIBIOS_BAD_REGISTER_NUMBER;
448 *value = (*value >> (8 * (where & 3))) & 0xffff;
450 *value = (*value >> (8 * (where & 3))) & 0xff;
452 return PCIBIOS_SUCCESSFUL;
455 /* Write to the PCI-to-PCI bridge configuration space */
456 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
457 unsigned int where, int size, u32 value)
459 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
466 mask = ~(0xffff << ((where & 3) * 8));
468 mask = ~(0xff << ((where & 3) * 8));
470 return PCIBIOS_BAD_REGISTER_NUMBER;
472 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
476 value = (reg & mask) | value << ((where & 3) * 8);
478 switch (where & ~3) {
480 bridge->command = value & 0xffff;
483 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
484 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
489 * We also keep bit 1 set, it is a read-only bit that
490 * indicates we support 32 bits addressing for the
493 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
494 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
495 bridge->secondary_status = value >> 16;
496 mvebu_pcie_handle_iobase_change(port);
499 case PCI_MEMORY_BASE:
500 bridge->membase = value & 0xffff;
501 bridge->memlimit = value >> 16;
502 mvebu_pcie_handle_membase_change(port);
505 case PCI_PREF_MEMORY_BASE:
506 bridge->prefmembase = value & 0xffff;
507 bridge->prefmemlimit = value >> 16;
510 case PCI_PREF_BASE_UPPER32:
511 bridge->prefbaseupper = value;
514 case PCI_PREF_LIMIT_UPPER32:
515 bridge->preflimitupper = value;
518 case PCI_IO_BASE_UPPER16:
519 bridge->iobaseupper = value & 0xffff;
520 bridge->iolimitupper = value >> 16;
521 mvebu_pcie_handle_iobase_change(port);
524 case PCI_PRIMARY_BUS:
525 bridge->primary_bus = value & 0xff;
526 bridge->secondary_bus = (value >> 8) & 0xff;
527 bridge->subordinate_bus = (value >> 16) & 0xff;
528 bridge->secondary_latency_timer = (value >> 24) & 0xff;
529 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
536 return PCIBIOS_SUCCESSFUL;
539 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
541 return sys->private_data;
544 static struct mvebu_pcie_port *
545 mvebu_pcie_find_port(struct mvebu_pcie *pcie, struct pci_bus *bus,
550 for (i = 0; i < pcie->nports; i++) {
551 struct mvebu_pcie_port *port = &pcie->ports[i];
552 if (bus->number == 0 && port->devfn == devfn)
554 if (bus->number != 0 &&
555 bus->number >= port->bridge.secondary_bus &&
556 bus->number <= port->bridge.subordinate_bus)
563 /* PCI configuration space write function */
564 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
565 int where, int size, u32 val)
567 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
568 struct mvebu_pcie_port *port;
572 port = mvebu_pcie_find_port(pcie, bus, devfn);
574 return PCIBIOS_DEVICE_NOT_FOUND;
576 /* Access the emulated PCI-to-PCI bridge */
577 if (bus->number == 0)
578 return mvebu_sw_pci_bridge_write(port, where, size, val);
581 return PCIBIOS_DEVICE_NOT_FOUND;
584 * On the secondary bus, we don't want to expose any other
585 * device than the device physically connected in the PCIe
586 * slot, visible in slot 0. In slot 1, there's a special
587 * Marvell device that only makes sense when the Armada is
588 * used as a PCIe endpoint.
590 if (bus->number == port->bridge.secondary_bus &&
591 PCI_SLOT(devfn) != 0)
592 return PCIBIOS_DEVICE_NOT_FOUND;
594 /* Access the real PCIe interface */
595 spin_lock_irqsave(&port->conf_lock, flags);
596 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
598 spin_unlock_irqrestore(&port->conf_lock, flags);
603 /* PCI configuration space read function */
604 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
607 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
608 struct mvebu_pcie_port *port;
612 port = mvebu_pcie_find_port(pcie, bus, devfn);
615 return PCIBIOS_DEVICE_NOT_FOUND;
618 /* Access the emulated PCI-to-PCI bridge */
619 if (bus->number == 0)
620 return mvebu_sw_pci_bridge_read(port, where, size, val);
622 if (!port->haslink) {
624 return PCIBIOS_DEVICE_NOT_FOUND;
628 * On the secondary bus, we don't want to expose any other
629 * device than the device physically connected in the PCIe
630 * slot, visible in slot 0. In slot 1, there's a special
631 * Marvell device that only makes sense when the Armada is
632 * used as a PCIe endpoint.
634 if (bus->number == port->bridge.secondary_bus &&
635 PCI_SLOT(devfn) != 0) {
637 return PCIBIOS_DEVICE_NOT_FOUND;
640 /* Access the real PCIe interface */
641 spin_lock_irqsave(&port->conf_lock, flags);
642 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
644 spin_unlock_irqrestore(&port->conf_lock, flags);
649 static struct pci_ops mvebu_pcie_ops = {
650 .read = mvebu_pcie_rd_conf,
651 .write = mvebu_pcie_wr_conf,
654 static int __init mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
656 struct mvebu_pcie *pcie = sys_to_pcie(sys);
659 pci_add_resource_offset(&sys->resources, &pcie->realio, sys->io_offset);
660 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
661 pci_add_resource(&sys->resources, &pcie->busn);
663 for (i = 0; i < pcie->nports; i++) {
664 struct mvebu_pcie_port *port = &pcie->ports[i];
665 mvebu_pcie_setup_hw(port);
671 static int __init mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
676 ret = of_irq_map_pci(dev, &oirq);
680 return irq_create_of_mapping(oirq.controller, oirq.specifier,
684 static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
686 struct mvebu_pcie *pcie = sys_to_pcie(sys);
689 bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
690 &mvebu_pcie_ops, sys, &sys->resources);
694 pci_scan_child_bus(bus);
699 resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
700 const struct resource *res,
701 resource_size_t start,
702 resource_size_t size,
703 resource_size_t align)
705 if (dev->bus->number != 0)
709 * On the PCI-to-PCI bridge side, the I/O windows must have at
710 * least a 64 KB size and be aligned on their size, and the
711 * memory windows must have at least a 1 MB size and be
712 * aligned on their size
714 if (res->flags & IORESOURCE_IO)
715 return round_up(start, max((resource_size_t)SZ_64K, size));
716 else if (res->flags & IORESOURCE_MEM)
717 return round_up(start, max((resource_size_t)SZ_1M, size));
722 static void __init mvebu_pcie_enable(struct mvebu_pcie *pcie)
726 memset(&hw, 0, sizeof(hw));
728 hw.nr_controllers = 1;
729 hw.private_data = (void **)&pcie;
730 hw.setup = mvebu_pcie_setup;
731 hw.scan = mvebu_pcie_scan_bus;
732 hw.map_irq = mvebu_pcie_map_irq;
733 hw.ops = &mvebu_pcie_ops;
734 hw.align_resource = mvebu_pcie_align_resource;
736 pci_common_init(&hw);
740 * Looks up the list of register addresses encoded into the reg =
741 * <...> property for one that matches the given port/lane. Once
744 static void __iomem * __init
745 mvebu_pcie_map_registers(struct platform_device *pdev,
746 struct device_node *np,
747 struct mvebu_pcie_port *port)
749 struct resource regs;
752 ret = of_address_to_resource(np, 0, ®s);
756 return devm_request_and_ioremap(&pdev->dev, ®s);
759 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
760 #define DT_TYPE_IO 0x1
761 #define DT_TYPE_MEM32 0x2
762 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
763 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
765 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
766 unsigned long type, int *tgt, int *attr)
768 const int na = 3, ns = 2;
770 int rlen, nranges, rangesz, pna, i;
772 range = of_get_property(np, "ranges", &rlen);
776 pna = of_n_addr_cells(np);
777 rangesz = pna + na + ns;
778 nranges = rlen / sizeof(__be32) / rangesz;
780 for (i = 0; i < nranges; i++) {
781 u32 flags = of_read_number(range, 1);
782 u32 slot = of_read_number(range, 2);
783 u64 cpuaddr = of_read_number(range + na, pna);
786 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
787 rtype = IORESOURCE_IO;
788 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
789 rtype = IORESOURCE_MEM;
791 if (slot == PCI_SLOT(devfn) && type == rtype) {
792 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
793 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
803 static int __init mvebu_pcie_probe(struct platform_device *pdev)
805 struct mvebu_pcie *pcie;
806 struct device_node *np = pdev->dev.of_node;
807 struct device_node *child;
810 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
817 /* Get the PCIe memory and I/O aperture */
818 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
819 if (resource_size(&pcie->mem) == 0) {
820 dev_err(&pdev->dev, "invalid memory aperture size\n");
824 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
825 if (resource_size(&pcie->io) == 0) {
826 dev_err(&pdev->dev, "invalid I/O aperture size\n");
830 pcie->realio.flags = pcie->io.flags;
831 pcie->realio.start = PCIBIOS_MIN_IO;
832 pcie->realio.end = min_t(resource_size_t,
834 resource_size(&pcie->io));
836 /* Get the bus range */
837 ret = of_pci_parse_bus_range(np, &pcie->busn);
839 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
844 for_each_child_of_node(pdev->dev.of_node, child) {
845 if (!of_device_is_available(child))
850 pcie->ports = devm_kzalloc(&pdev->dev, pcie->nports *
851 sizeof(struct mvebu_pcie_port),
857 for_each_child_of_node(pdev->dev.of_node, child) {
858 struct mvebu_pcie_port *port = &pcie->ports[i];
860 if (!of_device_is_available(child))
865 if (of_property_read_u32(child, "marvell,pcie-port",
868 "ignoring PCIe DT node, missing pcie-port property\n");
872 if (of_property_read_u32(child, "marvell,pcie-lane",
876 port->name = kasprintf(GFP_KERNEL, "pcie%d.%d",
877 port->port, port->lane);
879 port->devfn = of_pci_get_devfn(child);
883 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_MEM,
884 &port->mem_target, &port->mem_attr);
886 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for mem window\n",
887 port->port, port->lane);
891 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_IO,
892 &port->io_target, &port->io_attr);
894 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for io window\n",
895 port->port, port->lane);
899 port->base = mvebu_pcie_map_registers(pdev, child, port);
901 dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
902 port->port, port->lane);
906 mvebu_pcie_set_local_dev_nr(port, 1);
908 if (mvebu_pcie_link_up(port)) {
910 dev_info(&pdev->dev, "PCIe%d.%d: link up\n",
911 port->port, port->lane);
914 dev_info(&pdev->dev, "PCIe%d.%d: link down\n",
915 port->port, port->lane);
918 port->clk = of_clk_get_by_name(child, NULL);
919 if (IS_ERR(port->clk)) {
920 dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
921 port->port, port->lane);
929 clk_prepare_enable(port->clk);
930 spin_lock_init(&port->conf_lock);
932 mvebu_sw_pci_bridge_init(port);
937 mvebu_pcie_enable(pcie);
942 static const struct of_device_id mvebu_pcie_of_match_table[] = {
943 { .compatible = "marvell,armada-xp-pcie", },
944 { .compatible = "marvell,armada-370-pcie", },
945 { .compatible = "marvell,kirkwood-pcie", },
948 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
950 static struct platform_driver mvebu_pcie_driver = {
952 .owner = THIS_MODULE,
953 .name = "mvebu-pcie",
955 of_match_ptr(mvebu_pcie_of_match_table),
959 static int __init mvebu_pcie_init(void)
961 return platform_driver_probe(&mvebu_pcie_driver,
965 subsys_initcall(mvebu_pcie_init);
967 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
968 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
969 MODULE_LICENSE("GPLv2");