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_controller *msi;
104 struct resource realio;
106 struct resource busn;
110 /* Structure representing one PCIe interface */
111 struct mvebu_pcie_port {
117 unsigned int mem_target;
118 unsigned int mem_attr;
119 unsigned int io_target;
120 unsigned int io_attr;
123 int reset_active_low;
125 struct mvebu_sw_pci_bridge bridge;
126 struct device_node *dn;
127 struct mvebu_pcie *pcie;
128 phys_addr_t memwin_base;
130 phys_addr_t iowin_base;
134 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
136 writel(val, port->base + reg);
139 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
141 return readl(port->base + reg);
144 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
146 return port->io_target != -1 && port->io_attr != -1;
149 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
151 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
154 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
158 stat = mvebu_readl(port, PCIE_STAT_OFF);
159 stat &= ~PCIE_STAT_BUS;
161 mvebu_writel(port, stat, PCIE_STAT_OFF);
164 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
168 stat = mvebu_readl(port, PCIE_STAT_OFF);
169 stat &= ~PCIE_STAT_DEV;
171 mvebu_writel(port, stat, PCIE_STAT_OFF);
175 * Setup PCIE BARs and Address Decode Wins:
176 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
177 * WIN[0-3] -> DRAM bank[0-3]
179 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
181 const struct mbus_dram_target_info *dram;
185 dram = mv_mbus_dram_info();
187 /* First, disable and clear BARs and windows. */
188 for (i = 1; i < 3; i++) {
189 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
190 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
191 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
194 for (i = 0; i < 5; i++) {
195 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
196 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
197 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
200 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
201 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
202 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
204 /* Setup windows for DDR banks. Count total DDR size on the fly. */
206 for (i = 0; i < dram->num_cs; i++) {
207 const struct mbus_dram_window *cs = dram->cs + i;
209 mvebu_writel(port, cs->base & 0xffff0000,
210 PCIE_WIN04_BASE_OFF(i));
211 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
213 ((cs->size - 1) & 0xffff0000) |
214 (cs->mbus_attr << 8) |
215 (dram->mbus_dram_target_id << 4) | 1,
216 PCIE_WIN04_CTRL_OFF(i));
221 /* Round up 'size' to the nearest power of two. */
222 if ((size & (size - 1)) != 0)
223 size = 1 << fls(size);
225 /* Setup BAR[1] to all DRAM banks. */
226 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
227 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
228 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
229 PCIE_BAR_CTRL_OFF(1));
232 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
236 /* Point PCIe unit MBUS decode windows to DRAM space. */
237 mvebu_pcie_setup_wins(port);
239 /* Master + slave enable. */
240 cmd = mvebu_readl(port, PCIE_CMD_OFF);
241 cmd |= PCI_COMMAND_IO;
242 cmd |= PCI_COMMAND_MEMORY;
243 cmd |= PCI_COMMAND_MASTER;
244 mvebu_writel(port, cmd, PCIE_CMD_OFF);
246 /* Enable interrupt lines A-D. */
247 mask = mvebu_readl(port, PCIE_MASK_OFF);
248 mask |= PCIE_MASK_ENABLE_INTS;
249 mvebu_writel(port, mask, PCIE_MASK_OFF);
252 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
254 u32 devfn, int where, int size, u32 *val)
256 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
259 *val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
262 *val = (*val >> (8 * (where & 3))) & 0xff;
264 *val = (*val >> (8 * (where & 3))) & 0xffff;
266 return PCIBIOS_SUCCESSFUL;
269 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
271 u32 devfn, int where, int size, u32 val)
273 u32 _val, shift = 8 * (where & 3);
275 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
277 _val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
282 _val = (_val & ~(0xffff << shift)) | ((val & 0xffff) << shift);
284 _val = (_val & ~(0xff << shift)) | ((val & 0xff) << shift);
286 return PCIBIOS_BAD_REGISTER_NUMBER;
288 mvebu_writel(port, _val, PCIE_CONF_DATA_OFF);
290 return PCIBIOS_SUCCESSFUL;
294 * Remove windows, starting from the largest ones to the smallest
297 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
298 phys_addr_t base, size_t size)
301 size_t sz = 1 << (fls(size) - 1);
303 mvebu_mbus_del_window(base, sz);
310 * MBus windows can only have a power of two size, but PCI BARs do not
311 * have this constraint. Therefore, we have to split the PCI BAR into
312 * areas each having a power of two size. We start from the largest
313 * one (i.e highest order bit set in the size).
315 static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
316 unsigned int target, unsigned int attribute,
317 phys_addr_t base, size_t size,
320 size_t size_mapped = 0;
323 size_t sz = 1 << (fls(size) - 1);
326 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
329 phys_addr_t end = base + sz - 1;
331 dev_err(&port->pcie->pdev->dev,
332 "Could not create MBus window at [mem %pa-%pa]: %d\n",
334 mvebu_pcie_del_windows(port, base - size_mapped,
342 if (remap != MVEBU_MBUS_NO_REMAP)
347 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
351 /* Are the new iobase/iolimit values invalid? */
352 if (port->bridge.iolimit < port->bridge.iobase ||
353 port->bridge.iolimitupper < port->bridge.iobaseupper ||
354 !(port->bridge.command & PCI_COMMAND_IO)) {
356 /* If a window was configured, remove it */
357 if (port->iowin_base) {
358 mvebu_pcie_del_windows(port, port->iowin_base,
360 port->iowin_base = 0;
361 port->iowin_size = 0;
367 if (!mvebu_has_ioport(port)) {
368 dev_WARN(&port->pcie->pdev->dev,
369 "Attempt to set IO when IO is disabled\n");
374 * We read the PCI-to-PCI bridge emulated registers, and
375 * calculate the base address and size of the address decoding
376 * window to setup, according to the PCI-to-PCI bridge
377 * specifications. iobase is the bus address, port->iowin_base
378 * is the CPU address.
380 iobase = ((port->bridge.iobase & 0xF0) << 8) |
381 (port->bridge.iobaseupper << 16);
382 port->iowin_base = port->pcie->io.start + iobase;
383 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
384 (port->bridge.iolimitupper << 16)) -
387 mvebu_pcie_add_windows(port, port->io_target, port->io_attr,
388 port->iowin_base, port->iowin_size,
392 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
394 /* Are the new membase/memlimit values invalid? */
395 if (port->bridge.memlimit < port->bridge.membase ||
396 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
398 /* If a window was configured, remove it */
399 if (port->memwin_base) {
400 mvebu_pcie_del_windows(port, port->memwin_base,
402 port->memwin_base = 0;
403 port->memwin_size = 0;
410 * We read the PCI-to-PCI bridge emulated registers, and
411 * calculate the base address and size of the address decoding
412 * window to setup, according to the PCI-to-PCI bridge
415 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
417 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
418 port->memwin_base + 1;
420 mvebu_pcie_add_windows(port, port->mem_target, port->mem_attr,
421 port->memwin_base, port->memwin_size,
422 MVEBU_MBUS_NO_REMAP);
426 * Initialize the configuration space of the PCI-to-PCI bridge
427 * associated with the given PCIe interface.
429 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
431 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
433 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
435 bridge->class = PCI_CLASS_BRIDGE_PCI;
436 bridge->vendor = PCI_VENDOR_ID_MARVELL;
437 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
438 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
439 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
440 bridge->cache_line_size = 0x10;
442 /* We support 32 bits I/O addressing */
443 bridge->iobase = PCI_IO_RANGE_TYPE_32;
444 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
448 * Read the configuration space of the PCI-to-PCI bridge associated to
449 * the given PCIe interface.
451 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
452 unsigned int where, int size, u32 *value)
454 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
456 switch (where & ~3) {
458 *value = bridge->device << 16 | bridge->vendor;
462 *value = bridge->command;
465 case PCI_CLASS_REVISION:
466 *value = bridge->class << 16 | bridge->interface << 8 |
470 case PCI_CACHE_LINE_SIZE:
471 *value = bridge->bist << 24 | bridge->header_type << 16 |
472 bridge->latency_timer << 8 | bridge->cache_line_size;
475 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
476 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
479 case PCI_PRIMARY_BUS:
480 *value = (bridge->secondary_latency_timer << 24 |
481 bridge->subordinate_bus << 16 |
482 bridge->secondary_bus << 8 |
483 bridge->primary_bus);
487 if (!mvebu_has_ioport(port))
488 *value = bridge->secondary_status << 16;
490 *value = (bridge->secondary_status << 16 |
491 bridge->iolimit << 8 |
495 case PCI_MEMORY_BASE:
496 *value = (bridge->memlimit << 16 | bridge->membase);
499 case PCI_PREF_MEMORY_BASE:
503 case PCI_IO_BASE_UPPER16:
504 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
507 case PCI_ROM_ADDRESS1:
511 case PCI_INTERRUPT_LINE:
512 /* LINE PIN MIN_GNT MAX_LAT */
518 return PCIBIOS_BAD_REGISTER_NUMBER;
522 *value = (*value >> (8 * (where & 3))) & 0xffff;
524 *value = (*value >> (8 * (where & 3))) & 0xff;
526 return PCIBIOS_SUCCESSFUL;
529 /* Write to the PCI-to-PCI bridge configuration space */
530 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
531 unsigned int where, int size, u32 value)
533 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
540 mask = ~(0xffff << ((where & 3) * 8));
542 mask = ~(0xff << ((where & 3) * 8));
544 return PCIBIOS_BAD_REGISTER_NUMBER;
546 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
550 value = (reg & mask) | value << ((where & 3) * 8);
552 switch (where & ~3) {
555 u32 old = bridge->command;
557 if (!mvebu_has_ioport(port))
558 value &= ~PCI_COMMAND_IO;
560 bridge->command = value & 0xffff;
561 if ((old ^ bridge->command) & PCI_COMMAND_IO)
562 mvebu_pcie_handle_iobase_change(port);
563 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
564 mvebu_pcie_handle_membase_change(port);
568 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
569 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
574 * We also keep bit 1 set, it is a read-only bit that
575 * indicates we support 32 bits addressing for the
578 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
579 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
580 mvebu_pcie_handle_iobase_change(port);
583 case PCI_MEMORY_BASE:
584 bridge->membase = value & 0xffff;
585 bridge->memlimit = value >> 16;
586 mvebu_pcie_handle_membase_change(port);
589 case PCI_IO_BASE_UPPER16:
590 bridge->iobaseupper = value & 0xffff;
591 bridge->iolimitupper = value >> 16;
592 mvebu_pcie_handle_iobase_change(port);
595 case PCI_PRIMARY_BUS:
596 bridge->primary_bus = value & 0xff;
597 bridge->secondary_bus = (value >> 8) & 0xff;
598 bridge->subordinate_bus = (value >> 16) & 0xff;
599 bridge->secondary_latency_timer = (value >> 24) & 0xff;
600 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
607 return PCIBIOS_SUCCESSFUL;
610 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
612 return sys->private_data;
615 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
621 for (i = 0; i < pcie->nports; i++) {
622 struct mvebu_pcie_port *port = &pcie->ports[i];
624 if (bus->number == 0 && port->devfn == devfn)
626 if (bus->number != 0 &&
627 bus->number >= port->bridge.secondary_bus &&
628 bus->number <= port->bridge.subordinate_bus)
635 /* PCI configuration space write function */
636 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
637 int where, int size, u32 val)
639 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
640 struct mvebu_pcie_port *port;
643 port = mvebu_pcie_find_port(pcie, bus, devfn);
645 return PCIBIOS_DEVICE_NOT_FOUND;
647 /* Access the emulated PCI-to-PCI bridge */
648 if (bus->number == 0)
649 return mvebu_sw_pci_bridge_write(port, where, size, val);
651 if (!mvebu_pcie_link_up(port))
652 return PCIBIOS_DEVICE_NOT_FOUND;
655 * On the secondary bus, we don't want to expose any other
656 * device than the device physically connected in the PCIe
657 * slot, visible in slot 0. In slot 1, there's a special
658 * Marvell device that only makes sense when the Armada is
659 * used as a PCIe endpoint.
661 if (bus->number == port->bridge.secondary_bus &&
662 PCI_SLOT(devfn) != 0)
663 return PCIBIOS_DEVICE_NOT_FOUND;
665 /* Access the real PCIe interface */
666 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
672 /* PCI configuration space read function */
673 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
676 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
677 struct mvebu_pcie_port *port;
680 port = mvebu_pcie_find_port(pcie, bus, devfn);
683 return PCIBIOS_DEVICE_NOT_FOUND;
686 /* Access the emulated PCI-to-PCI bridge */
687 if (bus->number == 0)
688 return mvebu_sw_pci_bridge_read(port, where, size, val);
690 if (!mvebu_pcie_link_up(port)) {
692 return PCIBIOS_DEVICE_NOT_FOUND;
696 * On the secondary bus, we don't want to expose any other
697 * device than the device physically connected in the PCIe
698 * slot, visible in slot 0. In slot 1, there's a special
699 * Marvell device that only makes sense when the Armada is
700 * used as a PCIe endpoint.
702 if (bus->number == port->bridge.secondary_bus &&
703 PCI_SLOT(devfn) != 0) {
705 return PCIBIOS_DEVICE_NOT_FOUND;
708 /* Access the real PCIe interface */
709 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
715 static struct pci_ops mvebu_pcie_ops = {
716 .read = mvebu_pcie_rd_conf,
717 .write = mvebu_pcie_wr_conf,
720 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
722 struct mvebu_pcie *pcie = sys_to_pcie(sys);
725 pcie->mem.name = "PCI MEM";
726 pcie->realio.name = "PCI I/O";
728 if (request_resource(&iomem_resource, &pcie->mem))
731 if (resource_size(&pcie->realio) != 0) {
732 if (request_resource(&ioport_resource, &pcie->realio)) {
733 release_resource(&pcie->mem);
736 pci_add_resource_offset(&sys->resources, &pcie->realio,
739 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
740 pci_add_resource(&sys->resources, &pcie->busn);
742 for (i = 0; i < pcie->nports; i++) {
743 struct mvebu_pcie_port *port = &pcie->ports[i];
747 mvebu_pcie_setup_hw(port);
753 static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
755 struct mvebu_pcie *pcie = sys_to_pcie(sys);
758 bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
759 &mvebu_pcie_ops, sys, &sys->resources);
763 pci_scan_child_bus(bus);
768 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
769 const struct resource *res,
770 resource_size_t start,
771 resource_size_t size,
772 resource_size_t align)
774 if (dev->bus->number != 0)
778 * On the PCI-to-PCI bridge side, the I/O windows must have at
779 * least a 64 KB size and the memory windows must have at
780 * least a 1 MB size. Moreover, MBus windows need to have a
781 * base address aligned on their size, and their size must be
782 * a power of two. This means that if the BAR doesn't have a
783 * power of two size, several MBus windows will actually be
784 * created. We need to ensure that the biggest MBus window
785 * (which will be the first one) is aligned on its size, which
786 * explains the rounddown_pow_of_two() being done here.
788 if (res->flags & IORESOURCE_IO)
789 return round_up(start, max_t(resource_size_t, SZ_64K,
790 rounddown_pow_of_two(size)));
791 else if (res->flags & IORESOURCE_MEM)
792 return round_up(start, max_t(resource_size_t, SZ_1M,
793 rounddown_pow_of_two(size)));
798 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
802 memset(&hw, 0, sizeof(hw));
804 #ifdef CONFIG_PCI_MSI
805 hw.msi_ctrl = pcie->msi;
808 hw.nr_controllers = 1;
809 hw.private_data = (void **)&pcie;
810 hw.setup = mvebu_pcie_setup;
811 hw.scan = mvebu_pcie_scan_bus;
812 hw.map_irq = of_irq_parse_and_map_pci;
813 hw.ops = &mvebu_pcie_ops;
814 hw.align_resource = mvebu_pcie_align_resource;
816 pci_common_init(&hw);
820 * Looks up the list of register addresses encoded into the reg =
821 * <...> property for one that matches the given port/lane. Once
824 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
825 struct device_node *np,
826 struct mvebu_pcie_port *port)
828 struct resource regs;
831 ret = of_address_to_resource(np, 0, ®s);
835 return devm_ioremap_resource(&pdev->dev, ®s);
838 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
839 #define DT_TYPE_IO 0x1
840 #define DT_TYPE_MEM32 0x2
841 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
842 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
844 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
849 const int na = 3, ns = 2;
851 int rlen, nranges, rangesz, pna, i;
856 range = of_get_property(np, "ranges", &rlen);
860 pna = of_n_addr_cells(np);
861 rangesz = pna + na + ns;
862 nranges = rlen / sizeof(__be32) / rangesz;
864 for (i = 0; i < nranges; i++, range += rangesz) {
865 u32 flags = of_read_number(range, 1);
866 u32 slot = of_read_number(range + 1, 1);
867 u64 cpuaddr = of_read_number(range + na, pna);
870 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
871 rtype = IORESOURCE_IO;
872 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
873 rtype = IORESOURCE_MEM;
877 if (slot == PCI_SLOT(devfn) && type == rtype) {
878 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
879 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
887 static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
889 struct device_node *msi_node;
891 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
896 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
899 pcie->msi->dev = &pcie->pdev->dev;
902 static int mvebu_pcie_probe(struct platform_device *pdev)
904 struct mvebu_pcie *pcie;
905 struct device_node *np = pdev->dev.of_node;
906 struct device_node *child;
909 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
915 platform_set_drvdata(pdev, pcie);
917 /* Get the PCIe memory and I/O aperture */
918 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
919 if (resource_size(&pcie->mem) == 0) {
920 dev_err(&pdev->dev, "invalid memory aperture size\n");
924 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
926 if (resource_size(&pcie->io) != 0) {
927 pcie->realio.flags = pcie->io.flags;
928 pcie->realio.start = PCIBIOS_MIN_IO;
929 pcie->realio.end = min_t(resource_size_t,
931 resource_size(&pcie->io));
933 pcie->realio = pcie->io;
935 /* Get the bus range */
936 ret = of_pci_parse_bus_range(np, &pcie->busn);
938 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
944 for_each_child_of_node(pdev->dev.of_node, child) {
945 if (!of_device_is_available(child))
950 pcie->ports = devm_kzalloc(&pdev->dev, i *
951 sizeof(struct mvebu_pcie_port),
957 for_each_child_of_node(pdev->dev.of_node, child) {
958 struct mvebu_pcie_port *port = &pcie->ports[i];
959 enum of_gpio_flags flags;
961 if (!of_device_is_available(child))
966 if (of_property_read_u32(child, "marvell,pcie-port",
969 "ignoring PCIe DT node, missing pcie-port property\n");
973 if (of_property_read_u32(child, "marvell,pcie-lane",
977 port->name = kasprintf(GFP_KERNEL, "pcie%d.%d",
978 port->port, port->lane);
980 port->devfn = of_pci_get_devfn(child);
984 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_MEM,
985 &port->mem_target, &port->mem_attr);
987 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for mem window\n",
988 port->port, port->lane);
992 if (resource_size(&pcie->io) != 0)
993 mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_IO,
994 &port->io_target, &port->io_attr);
996 port->io_target = -1;
1000 port->reset_gpio = of_get_named_gpio_flags(child,
1001 "reset-gpios", 0, &flags);
1002 if (gpio_is_valid(port->reset_gpio)) {
1003 u32 reset_udelay = 20000;
1005 port->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
1006 port->reset_name = kasprintf(GFP_KERNEL,
1007 "pcie%d.%d-reset", port->port, port->lane);
1008 of_property_read_u32(child, "reset-delay-us",
1011 ret = devm_gpio_request_one(&pdev->dev,
1012 port->reset_gpio, GPIOF_DIR_OUT, port->reset_name);
1014 if (ret == -EPROBE_DEFER)
1019 gpio_set_value(port->reset_gpio,
1020 (port->reset_active_low) ? 1 : 0);
1021 msleep(reset_udelay/1000);
1024 port->clk = of_clk_get_by_name(child, NULL);
1025 if (IS_ERR(port->clk)) {
1026 dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
1027 port->port, port->lane);
1031 ret = clk_prepare_enable(port->clk);
1035 port->base = mvebu_pcie_map_registers(pdev, child, port);
1036 if (IS_ERR(port->base)) {
1037 dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
1038 port->port, port->lane);
1040 clk_disable_unprepare(port->clk);
1044 mvebu_pcie_set_local_dev_nr(port, 1);
1047 mvebu_sw_pci_bridge_init(port);
1053 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1054 pci_ioremap_io(i, pcie->io.start + i);
1056 mvebu_pcie_msi_enable(pcie);
1057 mvebu_pcie_enable(pcie);
1062 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1063 { .compatible = "marvell,armada-xp-pcie", },
1064 { .compatible = "marvell,armada-370-pcie", },
1065 { .compatible = "marvell,dove-pcie", },
1066 { .compatible = "marvell,kirkwood-pcie", },
1069 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
1071 static struct platform_driver mvebu_pcie_driver = {
1073 .name = "mvebu-pcie",
1074 .of_match_table = mvebu_pcie_of_match_table,
1075 /* driver unloading/unbinding currently not supported */
1076 .suppress_bind_attrs = true,
1078 .probe = mvebu_pcie_probe,
1080 module_platform_driver(mvebu_pcie_driver);
1082 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
1083 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
1084 MODULE_LICENSE("GPL v2");