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/msi.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/of_address.h>
18 #include <linux/of_pci.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_platform.h>
23 * PCIe unit register offsets.
25 #define PCIE_DEV_ID_OFF 0x0000
26 #define PCIE_CMD_OFF 0x0004
27 #define PCIE_DEV_REV_OFF 0x0008
28 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
29 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
30 #define PCIE_HEADER_LOG_4_OFF 0x0128
31 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
32 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
33 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
34 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
35 #define PCIE_WIN5_CTRL_OFF 0x1880
36 #define PCIE_WIN5_BASE_OFF 0x1884
37 #define PCIE_WIN5_REMAP_OFF 0x188c
38 #define PCIE_CONF_ADDR_OFF 0x18f8
39 #define PCIE_CONF_ADDR_EN 0x80000000
40 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
41 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
42 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
43 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
44 #define PCIE_CONF_ADDR(bus, devfn, where) \
45 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
46 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
48 #define PCIE_CONF_DATA_OFF 0x18fc
49 #define PCIE_MASK_OFF 0x1910
50 #define PCIE_MASK_ENABLE_INTS 0x0f000000
51 #define PCIE_CTRL_OFF 0x1a00
52 #define PCIE_CTRL_X1_MODE 0x0001
53 #define PCIE_STAT_OFF 0x1a04
54 #define PCIE_STAT_BUS 0xff00
55 #define PCIE_STAT_DEV 0x1f0000
56 #define PCIE_STAT_LINK_DOWN BIT(0)
57 #define PCIE_DEBUG_CTRL 0x1a60
58 #define PCIE_DEBUG_SOFT_RESET BIT(20)
61 * This product ID is registered by Marvell, and used when the Marvell
62 * SoC is not the root complex, but an endpoint on the PCIe bus. It is
63 * therefore safe to re-use this PCI ID for our emulated PCI-to-PCI
66 #define MARVELL_EMULATED_PCI_PCI_BRIDGE_ID 0x7846
68 /* PCI configuration space of a PCI-to-PCI bridge */
69 struct mvebu_sw_pci_bridge {
84 u8 secondary_latency_timer;
101 struct mvebu_pcie_port;
103 /* Structure representing all PCIe interfaces */
105 struct platform_device *pdev;
106 struct mvebu_pcie_port *ports;
107 struct msi_chip *msi;
109 struct resource realio;
111 struct resource busn;
115 /* Structure representing one PCIe interface */
116 struct mvebu_pcie_port {
119 spinlock_t conf_lock;
124 unsigned int mem_target;
125 unsigned int mem_attr;
126 unsigned int io_target;
127 unsigned int io_attr;
129 struct mvebu_sw_pci_bridge bridge;
130 struct device_node *dn;
131 struct mvebu_pcie *pcie;
132 phys_addr_t memwin_base;
134 phys_addr_t iowin_base;
138 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
140 return !(readl(port->base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
143 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
147 stat = readl(port->base + PCIE_STAT_OFF);
148 stat &= ~PCIE_STAT_BUS;
150 writel(stat, port->base + PCIE_STAT_OFF);
153 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
157 stat = readl(port->base + PCIE_STAT_OFF);
158 stat &= ~PCIE_STAT_DEV;
160 writel(stat, port->base + PCIE_STAT_OFF);
164 * Setup PCIE BARs and Address Decode Wins:
165 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
166 * WIN[0-3] -> DRAM bank[0-3]
168 static void __init mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
170 const struct mbus_dram_target_info *dram;
174 dram = mv_mbus_dram_info();
176 /* First, disable and clear BARs and windows. */
177 for (i = 1; i < 3; i++) {
178 writel(0, port->base + PCIE_BAR_CTRL_OFF(i));
179 writel(0, port->base + PCIE_BAR_LO_OFF(i));
180 writel(0, port->base + PCIE_BAR_HI_OFF(i));
183 for (i = 0; i < 5; i++) {
184 writel(0, port->base + PCIE_WIN04_CTRL_OFF(i));
185 writel(0, port->base + PCIE_WIN04_BASE_OFF(i));
186 writel(0, port->base + PCIE_WIN04_REMAP_OFF(i));
189 writel(0, port->base + PCIE_WIN5_CTRL_OFF);
190 writel(0, port->base + PCIE_WIN5_BASE_OFF);
191 writel(0, port->base + PCIE_WIN5_REMAP_OFF);
193 /* Setup windows for DDR banks. Count total DDR size on the fly. */
195 for (i = 0; i < dram->num_cs; i++) {
196 const struct mbus_dram_window *cs = dram->cs + i;
198 writel(cs->base & 0xffff0000,
199 port->base + PCIE_WIN04_BASE_OFF(i));
200 writel(0, port->base + PCIE_WIN04_REMAP_OFF(i));
201 writel(((cs->size - 1) & 0xffff0000) |
202 (cs->mbus_attr << 8) |
203 (dram->mbus_dram_target_id << 4) | 1,
204 port->base + PCIE_WIN04_CTRL_OFF(i));
209 /* Round up 'size' to the nearest power of two. */
210 if ((size & (size - 1)) != 0)
211 size = 1 << fls(size);
213 /* Setup BAR[1] to all DRAM banks. */
214 writel(dram->cs[0].base, port->base + PCIE_BAR_LO_OFF(1));
215 writel(0, port->base + PCIE_BAR_HI_OFF(1));
216 writel(((size - 1) & 0xffff0000) | 1,
217 port->base + PCIE_BAR_CTRL_OFF(1));
220 static void __init mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
225 /* Point PCIe unit MBUS decode windows to DRAM space. */
226 mvebu_pcie_setup_wins(port);
228 /* Master + slave enable. */
229 cmd = readw(port->base + PCIE_CMD_OFF);
230 cmd |= PCI_COMMAND_IO;
231 cmd |= PCI_COMMAND_MEMORY;
232 cmd |= PCI_COMMAND_MASTER;
233 writew(cmd, port->base + PCIE_CMD_OFF);
235 /* Enable interrupt lines A-D. */
236 mask = readl(port->base + PCIE_MASK_OFF);
237 mask |= PCIE_MASK_ENABLE_INTS;
238 writel(mask, port->base + PCIE_MASK_OFF);
241 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
243 u32 devfn, int where, int size, u32 *val)
245 writel(PCIE_CONF_ADDR(bus->number, devfn, where),
246 port->base + PCIE_CONF_ADDR_OFF);
248 *val = readl(port->base + PCIE_CONF_DATA_OFF);
251 *val = (*val >> (8 * (where & 3))) & 0xff;
253 *val = (*val >> (8 * (where & 3))) & 0xffff;
255 return PCIBIOS_SUCCESSFUL;
258 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
260 u32 devfn, int where, int size, u32 val)
262 int ret = PCIBIOS_SUCCESSFUL;
264 writel(PCIE_CONF_ADDR(bus->number, devfn, where),
265 port->base + PCIE_CONF_ADDR_OFF);
268 writel(val, port->base + PCIE_CONF_DATA_OFF);
270 writew(val, port->base + PCIE_CONF_DATA_OFF + (where & 3));
272 writeb(val, port->base + PCIE_CONF_DATA_OFF + (where & 3));
274 ret = PCIBIOS_BAD_REGISTER_NUMBER;
279 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
283 /* Are the new iobase/iolimit values invalid? */
284 if (port->bridge.iolimit < port->bridge.iobase ||
285 port->bridge.iolimitupper < port->bridge.iobaseupper) {
287 /* If a window was configured, remove it */
288 if (port->iowin_base) {
289 mvebu_mbus_del_window(port->iowin_base,
291 port->iowin_base = 0;
292 port->iowin_size = 0;
299 * We read the PCI-to-PCI bridge emulated registers, and
300 * calculate the base address and size of the address decoding
301 * window to setup, according to the PCI-to-PCI bridge
302 * specifications. iobase is the bus address, port->iowin_base
303 * is the CPU address.
305 iobase = ((port->bridge.iobase & 0xF0) << 8) |
306 (port->bridge.iobaseupper << 16);
307 port->iowin_base = port->pcie->io.start + iobase;
308 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
309 (port->bridge.iolimitupper << 16)) -
312 mvebu_mbus_add_window_remap_by_id(port->io_target, port->io_attr,
313 port->iowin_base, port->iowin_size,
316 pci_ioremap_io(iobase, port->iowin_base);
319 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
321 /* Are the new membase/memlimit values invalid? */
322 if (port->bridge.memlimit < port->bridge.membase) {
324 /* If a window was configured, remove it */
325 if (port->memwin_base) {
326 mvebu_mbus_del_window(port->memwin_base,
328 port->memwin_base = 0;
329 port->memwin_size = 0;
336 * We read the PCI-to-PCI bridge emulated registers, and
337 * calculate the base address and size of the address decoding
338 * window to setup, according to the PCI-to-PCI bridge
341 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
343 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
346 mvebu_mbus_add_window_by_id(port->mem_target, port->mem_attr,
347 port->memwin_base, port->memwin_size);
351 * Initialize the configuration space of the PCI-to-PCI bridge
352 * associated with the given PCIe interface.
354 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
356 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
358 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
360 bridge->class = PCI_CLASS_BRIDGE_PCI;
361 bridge->vendor = PCI_VENDOR_ID_MARVELL;
362 bridge->device = MARVELL_EMULATED_PCI_PCI_BRIDGE_ID;
363 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
364 bridge->cache_line_size = 0x10;
366 /* We support 32 bits I/O addressing */
367 bridge->iobase = PCI_IO_RANGE_TYPE_32;
368 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
372 * Read the configuration space of the PCI-to-PCI bridge associated to
373 * the given PCIe interface.
375 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
376 unsigned int where, int size, u32 *value)
378 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
380 switch (where & ~3) {
382 *value = bridge->device << 16 | bridge->vendor;
386 *value = bridge->command;
389 case PCI_CLASS_REVISION:
390 *value = bridge->class << 16 | bridge->interface << 8 |
394 case PCI_CACHE_LINE_SIZE:
395 *value = bridge->bist << 24 | bridge->header_type << 16 |
396 bridge->latency_timer << 8 | bridge->cache_line_size;
399 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
400 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
403 case PCI_PRIMARY_BUS:
404 *value = (bridge->secondary_latency_timer << 24 |
405 bridge->subordinate_bus << 16 |
406 bridge->secondary_bus << 8 |
407 bridge->primary_bus);
411 *value = (bridge->secondary_status << 16 |
412 bridge->iolimit << 8 |
416 case PCI_MEMORY_BASE:
417 *value = (bridge->memlimit << 16 | bridge->membase);
420 case PCI_PREF_MEMORY_BASE:
424 case PCI_IO_BASE_UPPER16:
425 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
428 case PCI_ROM_ADDRESS1:
434 return PCIBIOS_BAD_REGISTER_NUMBER;
438 *value = (*value >> (8 * (where & 3))) & 0xffff;
440 *value = (*value >> (8 * (where & 3))) & 0xff;
442 return PCIBIOS_SUCCESSFUL;
445 /* Write to the PCI-to-PCI bridge configuration space */
446 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
447 unsigned int where, int size, u32 value)
449 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
456 mask = ~(0xffff << ((where & 3) * 8));
458 mask = ~(0xff << ((where & 3) * 8));
460 return PCIBIOS_BAD_REGISTER_NUMBER;
462 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
466 value = (reg & mask) | value << ((where & 3) * 8);
468 switch (where & ~3) {
470 bridge->command = value & 0xffff;
473 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
474 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
479 * We also keep bit 1 set, it is a read-only bit that
480 * indicates we support 32 bits addressing for the
483 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
484 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
485 bridge->secondary_status = value >> 16;
486 mvebu_pcie_handle_iobase_change(port);
489 case PCI_MEMORY_BASE:
490 bridge->membase = value & 0xffff;
491 bridge->memlimit = value >> 16;
492 mvebu_pcie_handle_membase_change(port);
495 case PCI_IO_BASE_UPPER16:
496 bridge->iobaseupper = value & 0xffff;
497 bridge->iolimitupper = value >> 16;
498 mvebu_pcie_handle_iobase_change(port);
501 case PCI_PRIMARY_BUS:
502 bridge->primary_bus = value & 0xff;
503 bridge->secondary_bus = (value >> 8) & 0xff;
504 bridge->subordinate_bus = (value >> 16) & 0xff;
505 bridge->secondary_latency_timer = (value >> 24) & 0xff;
506 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
513 return PCIBIOS_SUCCESSFUL;
516 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
518 return sys->private_data;
521 static struct mvebu_pcie_port *
522 mvebu_pcie_find_port(struct mvebu_pcie *pcie, struct pci_bus *bus,
527 for (i = 0; i < pcie->nports; i++) {
528 struct mvebu_pcie_port *port = &pcie->ports[i];
529 if (bus->number == 0 && port->devfn == devfn)
531 if (bus->number != 0 &&
532 bus->number >= port->bridge.secondary_bus &&
533 bus->number <= port->bridge.subordinate_bus)
540 /* PCI configuration space write function */
541 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
542 int where, int size, u32 val)
544 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
545 struct mvebu_pcie_port *port;
549 port = mvebu_pcie_find_port(pcie, bus, devfn);
551 return PCIBIOS_DEVICE_NOT_FOUND;
553 /* Access the emulated PCI-to-PCI bridge */
554 if (bus->number == 0)
555 return mvebu_sw_pci_bridge_write(port, where, size, val);
558 return PCIBIOS_DEVICE_NOT_FOUND;
561 * On the secondary bus, we don't want to expose any other
562 * device than the device physically connected in the PCIe
563 * slot, visible in slot 0. In slot 1, there's a special
564 * Marvell device that only makes sense when the Armada is
565 * used as a PCIe endpoint.
567 if (bus->number == port->bridge.secondary_bus &&
568 PCI_SLOT(devfn) != 0)
569 return PCIBIOS_DEVICE_NOT_FOUND;
571 /* Access the real PCIe interface */
572 spin_lock_irqsave(&port->conf_lock, flags);
573 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
575 spin_unlock_irqrestore(&port->conf_lock, flags);
580 /* PCI configuration space read function */
581 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
584 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
585 struct mvebu_pcie_port *port;
589 port = mvebu_pcie_find_port(pcie, bus, devfn);
592 return PCIBIOS_DEVICE_NOT_FOUND;
595 /* Access the emulated PCI-to-PCI bridge */
596 if (bus->number == 0)
597 return mvebu_sw_pci_bridge_read(port, where, size, val);
599 if (!port->haslink) {
601 return PCIBIOS_DEVICE_NOT_FOUND;
605 * On the secondary bus, we don't want to expose any other
606 * device than the device physically connected in the PCIe
607 * slot, visible in slot 0. In slot 1, there's a special
608 * Marvell device that only makes sense when the Armada is
609 * used as a PCIe endpoint.
611 if (bus->number == port->bridge.secondary_bus &&
612 PCI_SLOT(devfn) != 0) {
614 return PCIBIOS_DEVICE_NOT_FOUND;
617 /* Access the real PCIe interface */
618 spin_lock_irqsave(&port->conf_lock, flags);
619 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
621 spin_unlock_irqrestore(&port->conf_lock, flags);
626 static struct pci_ops mvebu_pcie_ops = {
627 .read = mvebu_pcie_rd_conf,
628 .write = mvebu_pcie_wr_conf,
631 static int __init mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
633 struct mvebu_pcie *pcie = sys_to_pcie(sys);
636 pci_add_resource_offset(&sys->resources, &pcie->realio, sys->io_offset);
637 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
638 pci_add_resource(&sys->resources, &pcie->busn);
640 for (i = 0; i < pcie->nports; i++) {
641 struct mvebu_pcie_port *port = &pcie->ports[i];
644 mvebu_pcie_setup_hw(port);
650 static int __init mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
655 ret = of_irq_map_pci(dev, &oirq);
659 return irq_create_of_mapping(oirq.controller, oirq.specifier,
663 static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
665 struct mvebu_pcie *pcie = sys_to_pcie(sys);
668 bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
669 &mvebu_pcie_ops, sys, &sys->resources);
673 pci_scan_child_bus(bus);
678 void mvebu_pcie_add_bus(struct pci_bus *bus)
680 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
681 bus->msi = pcie->msi;
684 resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
685 const struct resource *res,
686 resource_size_t start,
687 resource_size_t size,
688 resource_size_t align)
690 if (dev->bus->number != 0)
694 * On the PCI-to-PCI bridge side, the I/O windows must have at
695 * least a 64 KB size and be aligned on their size, and the
696 * memory windows must have at least a 1 MB size and be
697 * aligned on their size
699 if (res->flags & IORESOURCE_IO)
700 return round_up(start, max((resource_size_t)SZ_64K, size));
701 else if (res->flags & IORESOURCE_MEM)
702 return round_up(start, max((resource_size_t)SZ_1M, size));
707 static void __init mvebu_pcie_enable(struct mvebu_pcie *pcie)
711 memset(&hw, 0, sizeof(hw));
713 hw.nr_controllers = 1;
714 hw.private_data = (void **)&pcie;
715 hw.setup = mvebu_pcie_setup;
716 hw.scan = mvebu_pcie_scan_bus;
717 hw.map_irq = mvebu_pcie_map_irq;
718 hw.ops = &mvebu_pcie_ops;
719 hw.align_resource = mvebu_pcie_align_resource;
720 hw.add_bus = mvebu_pcie_add_bus;
722 pci_common_init(&hw);
726 * Looks up the list of register addresses encoded into the reg =
727 * <...> property for one that matches the given port/lane. Once
730 static void __iomem * __init
731 mvebu_pcie_map_registers(struct platform_device *pdev,
732 struct device_node *np,
733 struct mvebu_pcie_port *port)
735 struct resource regs;
738 ret = of_address_to_resource(np, 0, ®s);
742 return devm_ioremap_resource(&pdev->dev, ®s);
745 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
746 #define DT_TYPE_IO 0x1
747 #define DT_TYPE_MEM32 0x2
748 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
749 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
751 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
752 unsigned long type, int *tgt, int *attr)
754 const int na = 3, ns = 2;
756 int rlen, nranges, rangesz, pna, i;
758 range = of_get_property(np, "ranges", &rlen);
762 pna = of_n_addr_cells(np);
763 rangesz = pna + na + ns;
764 nranges = rlen / sizeof(__be32) / rangesz;
766 for (i = 0; i < nranges; i++) {
767 u32 flags = of_read_number(range, 1);
768 u32 slot = of_read_number(range, 2);
769 u64 cpuaddr = of_read_number(range + na, pna);
772 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
773 rtype = IORESOURCE_IO;
774 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
775 rtype = IORESOURCE_MEM;
777 if (slot == PCI_SLOT(devfn) && type == rtype) {
778 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
779 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
789 static void __init mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
791 struct device_node *msi_node;
793 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
798 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
801 pcie->msi->dev = &pcie->pdev->dev;
804 static int __init mvebu_pcie_probe(struct platform_device *pdev)
806 struct mvebu_pcie *pcie;
807 struct device_node *np = pdev->dev.of_node;
808 struct device_node *child;
811 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
818 /* Get the PCIe memory and I/O aperture */
819 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
820 if (resource_size(&pcie->mem) == 0) {
821 dev_err(&pdev->dev, "invalid memory aperture size\n");
825 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
826 if (resource_size(&pcie->io) == 0) {
827 dev_err(&pdev->dev, "invalid I/O aperture size\n");
831 pcie->realio.flags = pcie->io.flags;
832 pcie->realio.start = PCIBIOS_MIN_IO;
833 pcie->realio.end = min_t(resource_size_t,
835 resource_size(&pcie->io));
837 /* Get the bus range */
838 ret = of_pci_parse_bus_range(np, &pcie->busn);
840 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
845 for_each_child_of_node(pdev->dev.of_node, child) {
846 if (!of_device_is_available(child))
851 pcie->ports = devm_kzalloc(&pdev->dev, pcie->nports *
852 sizeof(struct mvebu_pcie_port),
858 for_each_child_of_node(pdev->dev.of_node, child) {
859 struct mvebu_pcie_port *port = &pcie->ports[i];
861 if (!of_device_is_available(child))
866 if (of_property_read_u32(child, "marvell,pcie-port",
869 "ignoring PCIe DT node, missing pcie-port property\n");
873 if (of_property_read_u32(child, "marvell,pcie-lane",
877 port->name = kasprintf(GFP_KERNEL, "pcie%d.%d",
878 port->port, port->lane);
880 port->devfn = of_pci_get_devfn(child);
884 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_MEM,
885 &port->mem_target, &port->mem_attr);
887 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for mem window\n",
888 port->port, port->lane);
892 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_IO,
893 &port->io_target, &port->io_attr);
895 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for io window\n",
896 port->port, port->lane);
900 port->clk = of_clk_get_by_name(child, NULL);
901 if (IS_ERR(port->clk)) {
902 dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
903 port->port, port->lane);
907 ret = clk_prepare_enable(port->clk);
911 port->base = mvebu_pcie_map_registers(pdev, child, port);
912 if (IS_ERR(port->base)) {
913 dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
914 port->port, port->lane);
916 clk_disable_unprepare(port->clk);
920 mvebu_pcie_set_local_dev_nr(port, 1);
922 if (mvebu_pcie_link_up(port)) {
924 dev_info(&pdev->dev, "PCIe%d.%d: link up\n",
925 port->port, port->lane);
928 dev_info(&pdev->dev, "PCIe%d.%d: link down\n",
929 port->port, port->lane);
933 spin_lock_init(&port->conf_lock);
934 mvebu_sw_pci_bridge_init(port);
938 mvebu_pcie_msi_enable(pcie);
940 mvebu_pcie_enable(pcie);
945 static const struct of_device_id mvebu_pcie_of_match_table[] = {
946 { .compatible = "marvell,armada-xp-pcie", },
947 { .compatible = "marvell,armada-370-pcie", },
948 { .compatible = "marvell,kirkwood-pcie", },
951 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
953 static struct platform_driver mvebu_pcie_driver = {
955 .owner = THIS_MODULE,
956 .name = "mvebu-pcie",
958 of_match_ptr(mvebu_pcie_of_match_table),
962 static int __init mvebu_pcie_init(void)
964 return platform_driver_probe(&mvebu_pcie_driver,
968 subsys_initcall(mvebu_pcie_init);
970 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
971 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
972 MODULE_LICENSE("GPLv2");