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;
122 struct gpio_desc *reset_gpio;
124 struct mvebu_sw_pci_bridge bridge;
125 struct device_node *dn;
126 struct mvebu_pcie *pcie;
127 phys_addr_t memwin_base;
129 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 void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
258 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
263 *val = readb_relaxed(conf_data + (where & 3));
266 *val = readw_relaxed(conf_data + (where & 2));
269 *val = readl_relaxed(conf_data);
273 return PCIBIOS_SUCCESSFUL;
276 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
278 u32 devfn, int where, int size, u32 val)
280 void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
282 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
287 writeb(val, conf_data + (where & 3));
290 writew(val, conf_data + (where & 2));
293 writel(val, conf_data);
296 return PCIBIOS_BAD_REGISTER_NUMBER;
299 return PCIBIOS_SUCCESSFUL;
303 * Remove windows, starting from the largest ones to the smallest
306 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
307 phys_addr_t base, size_t size)
310 size_t sz = 1 << (fls(size) - 1);
312 mvebu_mbus_del_window(base, sz);
319 * MBus windows can only have a power of two size, but PCI BARs do not
320 * have this constraint. Therefore, we have to split the PCI BAR into
321 * areas each having a power of two size. We start from the largest
322 * one (i.e highest order bit set in the size).
324 static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
325 unsigned int target, unsigned int attribute,
326 phys_addr_t base, size_t size,
329 size_t size_mapped = 0;
332 size_t sz = 1 << (fls(size) - 1);
335 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
338 phys_addr_t end = base + sz - 1;
340 dev_err(&port->pcie->pdev->dev,
341 "Could not create MBus window at [mem %pa-%pa]: %d\n",
343 mvebu_pcie_del_windows(port, base - size_mapped,
351 if (remap != MVEBU_MBUS_NO_REMAP)
356 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
360 /* Are the new iobase/iolimit values invalid? */
361 if (port->bridge.iolimit < port->bridge.iobase ||
362 port->bridge.iolimitupper < port->bridge.iobaseupper ||
363 !(port->bridge.command & PCI_COMMAND_IO)) {
365 /* If a window was configured, remove it */
366 if (port->iowin_base) {
367 mvebu_pcie_del_windows(port, port->iowin_base,
369 port->iowin_base = 0;
370 port->iowin_size = 0;
376 if (!mvebu_has_ioport(port)) {
377 dev_WARN(&port->pcie->pdev->dev,
378 "Attempt to set IO when IO is disabled\n");
383 * We read the PCI-to-PCI bridge emulated registers, and
384 * calculate the base address and size of the address decoding
385 * window to setup, according to the PCI-to-PCI bridge
386 * specifications. iobase is the bus address, port->iowin_base
387 * is the CPU address.
389 iobase = ((port->bridge.iobase & 0xF0) << 8) |
390 (port->bridge.iobaseupper << 16);
391 port->iowin_base = port->pcie->io.start + iobase;
392 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
393 (port->bridge.iolimitupper << 16)) -
396 mvebu_pcie_add_windows(port, port->io_target, port->io_attr,
397 port->iowin_base, port->iowin_size,
401 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
403 /* Are the new membase/memlimit values invalid? */
404 if (port->bridge.memlimit < port->bridge.membase ||
405 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
407 /* If a window was configured, remove it */
408 if (port->memwin_base) {
409 mvebu_pcie_del_windows(port, port->memwin_base,
411 port->memwin_base = 0;
412 port->memwin_size = 0;
419 * We read the PCI-to-PCI bridge emulated registers, and
420 * calculate the base address and size of the address decoding
421 * window to setup, according to the PCI-to-PCI bridge
424 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
426 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
427 port->memwin_base + 1;
429 mvebu_pcie_add_windows(port, port->mem_target, port->mem_attr,
430 port->memwin_base, port->memwin_size,
431 MVEBU_MBUS_NO_REMAP);
435 * Initialize the configuration space of the PCI-to-PCI bridge
436 * associated with the given PCIe interface.
438 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
440 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
442 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
444 bridge->class = PCI_CLASS_BRIDGE_PCI;
445 bridge->vendor = PCI_VENDOR_ID_MARVELL;
446 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
447 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
448 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
449 bridge->cache_line_size = 0x10;
451 /* We support 32 bits I/O addressing */
452 bridge->iobase = PCI_IO_RANGE_TYPE_32;
453 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
457 * Read the configuration space of the PCI-to-PCI bridge associated to
458 * the given PCIe interface.
460 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
461 unsigned int where, int size, u32 *value)
463 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
465 switch (where & ~3) {
467 *value = bridge->device << 16 | bridge->vendor;
471 *value = bridge->command;
474 case PCI_CLASS_REVISION:
475 *value = bridge->class << 16 | bridge->interface << 8 |
479 case PCI_CACHE_LINE_SIZE:
480 *value = bridge->bist << 24 | bridge->header_type << 16 |
481 bridge->latency_timer << 8 | bridge->cache_line_size;
484 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
485 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
488 case PCI_PRIMARY_BUS:
489 *value = (bridge->secondary_latency_timer << 24 |
490 bridge->subordinate_bus << 16 |
491 bridge->secondary_bus << 8 |
492 bridge->primary_bus);
496 if (!mvebu_has_ioport(port))
497 *value = bridge->secondary_status << 16;
499 *value = (bridge->secondary_status << 16 |
500 bridge->iolimit << 8 |
504 case PCI_MEMORY_BASE:
505 *value = (bridge->memlimit << 16 | bridge->membase);
508 case PCI_PREF_MEMORY_BASE:
512 case PCI_IO_BASE_UPPER16:
513 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
516 case PCI_ROM_ADDRESS1:
520 case PCI_INTERRUPT_LINE:
521 /* LINE PIN MIN_GNT MAX_LAT */
527 * PCI defines configuration read accesses to reserved or
528 * unimplemented registers to read as zero and complete
532 return PCIBIOS_SUCCESSFUL;
536 *value = (*value >> (8 * (where & 3))) & 0xffff;
538 *value = (*value >> (8 * (where & 3))) & 0xff;
540 return PCIBIOS_SUCCESSFUL;
543 /* Write to the PCI-to-PCI bridge configuration space */
544 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
545 unsigned int where, int size, u32 value)
547 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
554 mask = ~(0xffff << ((where & 3) * 8));
556 mask = ~(0xff << ((where & 3) * 8));
558 return PCIBIOS_BAD_REGISTER_NUMBER;
560 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
564 value = (reg & mask) | value << ((where & 3) * 8);
566 switch (where & ~3) {
569 u32 old = bridge->command;
571 if (!mvebu_has_ioport(port))
572 value &= ~PCI_COMMAND_IO;
574 bridge->command = value & 0xffff;
575 if ((old ^ bridge->command) & PCI_COMMAND_IO)
576 mvebu_pcie_handle_iobase_change(port);
577 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
578 mvebu_pcie_handle_membase_change(port);
582 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
583 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
588 * We also keep bit 1 set, it is a read-only bit that
589 * indicates we support 32 bits addressing for the
592 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
593 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
594 mvebu_pcie_handle_iobase_change(port);
597 case PCI_MEMORY_BASE:
598 bridge->membase = value & 0xffff;
599 bridge->memlimit = value >> 16;
600 mvebu_pcie_handle_membase_change(port);
603 case PCI_IO_BASE_UPPER16:
604 bridge->iobaseupper = value & 0xffff;
605 bridge->iolimitupper = value >> 16;
606 mvebu_pcie_handle_iobase_change(port);
609 case PCI_PRIMARY_BUS:
610 bridge->primary_bus = value & 0xff;
611 bridge->secondary_bus = (value >> 8) & 0xff;
612 bridge->subordinate_bus = (value >> 16) & 0xff;
613 bridge->secondary_latency_timer = (value >> 24) & 0xff;
614 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
621 return PCIBIOS_SUCCESSFUL;
624 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
626 return sys->private_data;
629 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
635 for (i = 0; i < pcie->nports; i++) {
636 struct mvebu_pcie_port *port = &pcie->ports[i];
638 if (bus->number == 0 && port->devfn == devfn)
640 if (bus->number != 0 &&
641 bus->number >= port->bridge.secondary_bus &&
642 bus->number <= port->bridge.subordinate_bus)
649 /* PCI configuration space write function */
650 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
651 int where, int size, u32 val)
653 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
654 struct mvebu_pcie_port *port;
657 port = mvebu_pcie_find_port(pcie, bus, devfn);
659 return PCIBIOS_DEVICE_NOT_FOUND;
661 /* Access the emulated PCI-to-PCI bridge */
662 if (bus->number == 0)
663 return mvebu_sw_pci_bridge_write(port, where, size, val);
665 if (!mvebu_pcie_link_up(port))
666 return PCIBIOS_DEVICE_NOT_FOUND;
669 * On the secondary bus, we don't want to expose any other
670 * device than the device physically connected in the PCIe
671 * slot, visible in slot 0. In slot 1, there's a special
672 * Marvell device that only makes sense when the Armada is
673 * used as a PCIe endpoint.
675 if (bus->number == port->bridge.secondary_bus &&
676 PCI_SLOT(devfn) != 0)
677 return PCIBIOS_DEVICE_NOT_FOUND;
679 /* Access the real PCIe interface */
680 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
686 /* PCI configuration space read function */
687 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
690 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
691 struct mvebu_pcie_port *port;
694 port = mvebu_pcie_find_port(pcie, bus, devfn);
697 return PCIBIOS_DEVICE_NOT_FOUND;
700 /* Access the emulated PCI-to-PCI bridge */
701 if (bus->number == 0)
702 return mvebu_sw_pci_bridge_read(port, where, size, val);
704 if (!mvebu_pcie_link_up(port)) {
706 return PCIBIOS_DEVICE_NOT_FOUND;
710 * On the secondary bus, we don't want to expose any other
711 * device than the device physically connected in the PCIe
712 * slot, visible in slot 0. In slot 1, there's a special
713 * Marvell device that only makes sense when the Armada is
714 * used as a PCIe endpoint.
716 if (bus->number == port->bridge.secondary_bus &&
717 PCI_SLOT(devfn) != 0) {
719 return PCIBIOS_DEVICE_NOT_FOUND;
722 /* Access the real PCIe interface */
723 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
729 static struct pci_ops mvebu_pcie_ops = {
730 .read = mvebu_pcie_rd_conf,
731 .write = mvebu_pcie_wr_conf,
734 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
736 struct mvebu_pcie *pcie = sys_to_pcie(sys);
739 pcie->mem.name = "PCI MEM";
740 pcie->realio.name = "PCI I/O";
742 if (request_resource(&iomem_resource, &pcie->mem))
745 if (resource_size(&pcie->realio) != 0) {
746 if (request_resource(&ioport_resource, &pcie->realio)) {
747 release_resource(&pcie->mem);
750 pci_add_resource_offset(&sys->resources, &pcie->realio,
753 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
754 pci_add_resource(&sys->resources, &pcie->busn);
756 for (i = 0; i < pcie->nports; i++) {
757 struct mvebu_pcie_port *port = &pcie->ports[i];
761 mvebu_pcie_setup_hw(port);
767 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
768 const struct resource *res,
769 resource_size_t start,
770 resource_size_t size,
771 resource_size_t align)
773 if (dev->bus->number != 0)
777 * On the PCI-to-PCI bridge side, the I/O windows must have at
778 * least a 64 KB size and the memory windows must have at
779 * least a 1 MB size. Moreover, MBus windows need to have a
780 * base address aligned on their size, and their size must be
781 * a power of two. This means that if the BAR doesn't have a
782 * power of two size, several MBus windows will actually be
783 * created. We need to ensure that the biggest MBus window
784 * (which will be the first one) is aligned on its size, which
785 * explains the rounddown_pow_of_two() being done here.
787 if (res->flags & IORESOURCE_IO)
788 return round_up(start, max_t(resource_size_t, SZ_64K,
789 rounddown_pow_of_two(size)));
790 else if (res->flags & IORESOURCE_MEM)
791 return round_up(start, max_t(resource_size_t, SZ_1M,
792 rounddown_pow_of_two(size)));
797 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
801 memset(&hw, 0, sizeof(hw));
803 #ifdef CONFIG_PCI_MSI
804 hw.msi_ctrl = pcie->msi;
807 hw.nr_controllers = 1;
808 hw.private_data = (void **)&pcie;
809 hw.setup = mvebu_pcie_setup;
810 hw.map_irq = of_irq_parse_and_map_pci;
811 hw.ops = &mvebu_pcie_ops;
812 hw.align_resource = mvebu_pcie_align_resource;
814 pci_common_init_dev(&pcie->pdev->dev, &hw);
818 * Looks up the list of register addresses encoded into the reg =
819 * <...> property for one that matches the given port/lane. Once
822 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
823 struct device_node *np,
824 struct mvebu_pcie_port *port)
826 struct resource regs;
829 ret = of_address_to_resource(np, 0, ®s);
833 return devm_ioremap_resource(&pdev->dev, ®s);
836 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
837 #define DT_TYPE_IO 0x1
838 #define DT_TYPE_MEM32 0x2
839 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
840 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
842 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
847 const int na = 3, ns = 2;
849 int rlen, nranges, rangesz, pna, i;
854 range = of_get_property(np, "ranges", &rlen);
858 pna = of_n_addr_cells(np);
859 rangesz = pna + na + ns;
860 nranges = rlen / sizeof(__be32) / rangesz;
862 for (i = 0; i < nranges; i++, range += rangesz) {
863 u32 flags = of_read_number(range, 1);
864 u32 slot = of_read_number(range + 1, 1);
865 u64 cpuaddr = of_read_number(range + na, pna);
868 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
869 rtype = IORESOURCE_IO;
870 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
871 rtype = IORESOURCE_MEM;
875 if (slot == PCI_SLOT(devfn) && type == rtype) {
876 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
877 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
885 static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
887 struct device_node *msi_node;
889 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
894 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
895 of_node_put(msi_node);
898 pcie->msi->dev = &pcie->pdev->dev;
901 static int mvebu_pcie_suspend(struct device *dev)
903 struct mvebu_pcie *pcie;
906 pcie = dev_get_drvdata(dev);
907 for (i = 0; i < pcie->nports; i++) {
908 struct mvebu_pcie_port *port = pcie->ports + i;
909 port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
915 static int mvebu_pcie_resume(struct device *dev)
917 struct mvebu_pcie *pcie;
920 pcie = dev_get_drvdata(dev);
921 for (i = 0; i < pcie->nports; i++) {
922 struct mvebu_pcie_port *port = pcie->ports + i;
923 mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
924 mvebu_pcie_setup_hw(port);
930 static void mvebu_pcie_port_clk_put(void *data)
932 struct mvebu_pcie_port *port = data;
937 static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
938 struct mvebu_pcie_port *port, struct device_node *child)
940 struct device *dev = &pcie->pdev->dev;
941 enum of_gpio_flags flags;
946 if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) {
947 dev_warn(dev, "ignoring %s, missing pcie-port property\n",
948 of_node_full_name(child));
952 if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane))
955 port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port,
962 port->devfn = of_pci_get_devfn(child);
966 ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
967 &port->mem_target, &port->mem_attr);
969 dev_err(dev, "%s: cannot get tgt/attr for mem window\n",
974 if (resource_size(&pcie->io) != 0) {
975 mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO,
976 &port->io_target, &port->io_attr);
978 port->io_target = -1;
982 reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags);
983 if (reset_gpio == -EPROBE_DEFER) {
988 if (gpio_is_valid(reset_gpio)) {
989 unsigned long gpio_flags;
991 port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset",
993 if (!port->reset_name) {
998 if (flags & OF_GPIO_ACTIVE_LOW) {
999 dev_info(dev, "%s: reset gpio is active low\n",
1000 of_node_full_name(child));
1001 gpio_flags = GPIOF_ACTIVE_LOW |
1004 gpio_flags = GPIOF_OUT_INIT_HIGH;
1007 ret = devm_gpio_request_one(dev, reset_gpio, gpio_flags,
1010 if (ret == -EPROBE_DEFER)
1015 port->reset_gpio = gpio_to_desc(reset_gpio);
1018 port->clk = of_clk_get_by_name(child, NULL);
1019 if (IS_ERR(port->clk)) {
1020 dev_err(dev, "%s: cannot get clock\n", port->name);
1024 ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
1035 /* In the case of skipping, we need to free these */
1036 devm_kfree(dev, port->reset_name);
1037 port->reset_name = NULL;
1038 devm_kfree(dev, port->name);
1045 static int mvebu_pcie_probe(struct platform_device *pdev)
1047 struct mvebu_pcie *pcie;
1048 struct device_node *np = pdev->dev.of_node;
1049 struct device_node *child;
1052 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
1058 platform_set_drvdata(pdev, pcie);
1060 /* Get the PCIe memory and I/O aperture */
1061 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
1062 if (resource_size(&pcie->mem) == 0) {
1063 dev_err(&pdev->dev, "invalid memory aperture size\n");
1067 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
1069 if (resource_size(&pcie->io) != 0) {
1070 pcie->realio.flags = pcie->io.flags;
1071 pcie->realio.start = PCIBIOS_MIN_IO;
1072 pcie->realio.end = min_t(resource_size_t,
1074 resource_size(&pcie->io));
1076 pcie->realio = pcie->io;
1078 /* Get the bus range */
1079 ret = of_pci_parse_bus_range(np, &pcie->busn);
1081 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
1086 num = of_get_available_child_count(pdev->dev.of_node);
1088 pcie->ports = devm_kcalloc(&pdev->dev, num, sizeof(*pcie->ports),
1094 for_each_available_child_of_node(pdev->dev.of_node, child) {
1095 struct mvebu_pcie_port *port = &pcie->ports[i];
1097 ret = mvebu_pcie_parse_port(pcie, port, child);
1101 } else if (ret == 0) {
1110 for (i = 0; i < pcie->nports; i++) {
1111 struct mvebu_pcie_port *port = &pcie->ports[i];
1117 if (port->reset_gpio) {
1118 u32 reset_udelay = 20000;
1120 of_property_read_u32(child, "reset-delay-us",
1123 gpiod_set_value_cansleep(port->reset_gpio, 0);
1124 msleep(reset_udelay / 1000);
1127 ret = clk_prepare_enable(port->clk);
1131 port->base = mvebu_pcie_map_registers(pdev, child, port);
1132 if (IS_ERR(port->base)) {
1133 dev_err(&pdev->dev, "%s: cannot map registers\n",
1136 clk_disable_unprepare(port->clk);
1140 mvebu_pcie_set_local_dev_nr(port, 1);
1141 mvebu_sw_pci_bridge_init(port);
1146 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1147 pci_ioremap_io(i, pcie->io.start + i);
1149 mvebu_pcie_msi_enable(pcie);
1150 mvebu_pcie_enable(pcie);
1152 platform_set_drvdata(pdev, pcie);
1157 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1158 { .compatible = "marvell,armada-xp-pcie", },
1159 { .compatible = "marvell,armada-370-pcie", },
1160 { .compatible = "marvell,dove-pcie", },
1161 { .compatible = "marvell,kirkwood-pcie", },
1164 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
1166 static struct dev_pm_ops mvebu_pcie_pm_ops = {
1167 .suspend_noirq = mvebu_pcie_suspend,
1168 .resume_noirq = mvebu_pcie_resume,
1171 static struct platform_driver mvebu_pcie_driver = {
1173 .name = "mvebu-pcie",
1174 .of_match_table = mvebu_pcie_of_match_table,
1175 /* driver unloading/unbinding currently not supported */
1176 .suppress_bind_attrs = true,
1177 .pm = &mvebu_pcie_pm_ops,
1179 .probe = mvebu_pcie_probe,
1181 module_platform_driver(mvebu_pcie_driver);
1183 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
1184 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
1185 MODULE_LICENSE("GPL v2");