2 * PCIe driver for Marvell Armada 370 and Armada XP SoCs
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/module.h>
15 #include <linux/mbus.h>
16 #include <linux/msi.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_address.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_pci.h>
23 #include <linux/of_platform.h>
26 * PCIe unit register offsets.
28 #define PCIE_DEV_ID_OFF 0x0000
29 #define PCIE_CMD_OFF 0x0004
30 #define PCIE_DEV_REV_OFF 0x0008
31 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
32 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
33 #define PCIE_HEADER_LOG_4_OFF 0x0128
34 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
35 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
36 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
37 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
38 #define PCIE_WIN5_CTRL_OFF 0x1880
39 #define PCIE_WIN5_BASE_OFF 0x1884
40 #define PCIE_WIN5_REMAP_OFF 0x188c
41 #define PCIE_CONF_ADDR_OFF 0x18f8
42 #define PCIE_CONF_ADDR_EN 0x80000000
43 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
44 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
45 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
46 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
47 #define PCIE_CONF_ADDR(bus, devfn, where) \
48 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
49 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
51 #define PCIE_CONF_DATA_OFF 0x18fc
52 #define PCIE_MASK_OFF 0x1910
53 #define PCIE_MASK_ENABLE_INTS 0x0f000000
54 #define PCIE_CTRL_OFF 0x1a00
55 #define PCIE_CTRL_X1_MODE 0x0001
56 #define PCIE_STAT_OFF 0x1a04
57 #define PCIE_STAT_BUS 0xff00
58 #define PCIE_STAT_DEV 0x1f0000
59 #define PCIE_STAT_LINK_DOWN BIT(0)
60 #define PCIE_DEBUG_CTRL 0x1a60
61 #define PCIE_DEBUG_SOFT_RESET BIT(20)
63 /* PCI configuration space of a PCI-to-PCI bridge */
64 struct mvebu_sw_pci_bridge {
79 u8 secondary_latency_timer;
96 struct mvebu_pcie_port;
98 /* Structure representing all PCIe interfaces */
100 struct platform_device *pdev;
101 struct mvebu_pcie_port *ports;
102 struct msi_chip *msi;
105 struct resource realio;
108 struct resource busn;
112 /* Structure representing one PCIe interface */
113 struct mvebu_pcie_port {
116 spinlock_t conf_lock;
120 unsigned int mem_target;
121 unsigned int mem_attr;
122 unsigned int io_target;
123 unsigned int io_attr;
126 int reset_active_low;
128 struct mvebu_sw_pci_bridge bridge;
129 struct device_node *dn;
130 struct mvebu_pcie *pcie;
131 phys_addr_t memwin_base;
133 phys_addr_t iowin_base;
137 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
139 writel(val, port->base + reg);
142 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
144 return readl(port->base + reg);
147 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
149 return port->io_target != -1 && port->io_attr != -1;
152 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
154 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
157 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
161 stat = mvebu_readl(port, PCIE_STAT_OFF);
162 stat &= ~PCIE_STAT_BUS;
164 mvebu_writel(port, stat, PCIE_STAT_OFF);
167 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
171 stat = mvebu_readl(port, PCIE_STAT_OFF);
172 stat &= ~PCIE_STAT_DEV;
174 mvebu_writel(port, stat, PCIE_STAT_OFF);
178 * Setup PCIE BARs and Address Decode Wins:
179 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
180 * WIN[0-3] -> DRAM bank[0-3]
182 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
184 const struct mbus_dram_target_info *dram;
188 dram = mv_mbus_dram_info();
190 /* First, disable and clear BARs and windows. */
191 for (i = 1; i < 3; i++) {
192 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
193 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
194 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
197 for (i = 0; i < 5; i++) {
198 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
199 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
200 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
203 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
204 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
205 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
207 /* Setup windows for DDR banks. Count total DDR size on the fly. */
209 for (i = 0; i < dram->num_cs; i++) {
210 const struct mbus_dram_window *cs = dram->cs + i;
212 mvebu_writel(port, cs->base & 0xffff0000,
213 PCIE_WIN04_BASE_OFF(i));
214 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
216 ((cs->size - 1) & 0xffff0000) |
217 (cs->mbus_attr << 8) |
218 (dram->mbus_dram_target_id << 4) | 1,
219 PCIE_WIN04_CTRL_OFF(i));
224 /* Round up 'size' to the nearest power of two. */
225 if ((size & (size - 1)) != 0)
226 size = 1 << fls(size);
228 /* Setup BAR[1] to all DRAM banks. */
229 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
230 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
231 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
232 PCIE_BAR_CTRL_OFF(1));
235 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
239 /* Point PCIe unit MBUS decode windows to DRAM space. */
240 mvebu_pcie_setup_wins(port);
242 /* Master + slave enable. */
243 cmd = mvebu_readl(port, PCIE_CMD_OFF);
244 cmd |= PCI_COMMAND_IO;
245 cmd |= PCI_COMMAND_MEMORY;
246 cmd |= PCI_COMMAND_MASTER;
247 mvebu_writel(port, cmd, PCIE_CMD_OFF);
249 /* Enable interrupt lines A-D. */
250 mask = mvebu_readl(port, PCIE_MASK_OFF);
251 mask |= PCIE_MASK_ENABLE_INTS;
252 mvebu_writel(port, mask, PCIE_MASK_OFF);
255 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
257 u32 devfn, int where, int size, u32 *val)
259 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
262 *val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
265 *val = (*val >> (8 * (where & 3))) & 0xff;
267 *val = (*val >> (8 * (where & 3))) & 0xffff;
269 return PCIBIOS_SUCCESSFUL;
272 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
274 u32 devfn, int where, int size, u32 val)
276 u32 _val, shift = 8 * (where & 3);
278 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
280 _val = mvebu_readl(port, PCIE_CONF_DATA_OFF);
285 _val = (_val & ~(0xffff << shift)) | ((val & 0xffff) << shift);
287 _val = (_val & ~(0xff << shift)) | ((val & 0xff) << shift);
289 return PCIBIOS_BAD_REGISTER_NUMBER;
291 mvebu_writel(port, _val, PCIE_CONF_DATA_OFF);
293 return PCIBIOS_SUCCESSFUL;
296 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
300 /* Are the new iobase/iolimit values invalid? */
301 if (port->bridge.iolimit < port->bridge.iobase ||
302 port->bridge.iolimitupper < port->bridge.iobaseupper ||
303 !(port->bridge.command & PCI_COMMAND_IO)) {
305 /* If a window was configured, remove it */
306 if (port->iowin_base) {
307 mvebu_mbus_del_window(port->iowin_base,
309 port->iowin_base = 0;
310 port->iowin_size = 0;
316 if (!mvebu_has_ioport(port)) {
317 dev_WARN(&port->pcie->pdev->dev,
318 "Attempt to set IO when IO is disabled\n");
323 * We read the PCI-to-PCI bridge emulated registers, and
324 * calculate the base address and size of the address decoding
325 * window to setup, according to the PCI-to-PCI bridge
326 * specifications. iobase is the bus address, port->iowin_base
327 * is the CPU address.
329 iobase = ((port->bridge.iobase & 0xF0) << 8) |
330 (port->bridge.iobaseupper << 16);
331 port->iowin_base = port->pcie->io.start + iobase;
332 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
333 (port->bridge.iolimitupper << 16)) -
336 mvebu_mbus_add_window_remap_by_id(port->io_target, port->io_attr,
337 port->iowin_base, port->iowin_size,
341 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
343 /* Are the new membase/memlimit values invalid? */
344 if (port->bridge.memlimit < port->bridge.membase ||
345 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
347 /* If a window was configured, remove it */
348 if (port->memwin_base) {
349 mvebu_mbus_del_window(port->memwin_base,
351 port->memwin_base = 0;
352 port->memwin_size = 0;
359 * We read the PCI-to-PCI bridge emulated registers, and
360 * calculate the base address and size of the address decoding
361 * window to setup, according to the PCI-to-PCI bridge
364 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
366 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
369 mvebu_mbus_add_window_by_id(port->mem_target, port->mem_attr,
370 port->memwin_base, port->memwin_size);
374 * Initialize the configuration space of the PCI-to-PCI bridge
375 * associated with the given PCIe interface.
377 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
379 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
381 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
383 bridge->class = PCI_CLASS_BRIDGE_PCI;
384 bridge->vendor = PCI_VENDOR_ID_MARVELL;
385 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
386 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
387 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
388 bridge->cache_line_size = 0x10;
390 /* We support 32 bits I/O addressing */
391 bridge->iobase = PCI_IO_RANGE_TYPE_32;
392 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
396 * Read the configuration space of the PCI-to-PCI bridge associated to
397 * the given PCIe interface.
399 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
400 unsigned int where, int size, u32 *value)
402 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
404 switch (where & ~3) {
406 *value = bridge->device << 16 | bridge->vendor;
410 *value = bridge->command;
413 case PCI_CLASS_REVISION:
414 *value = bridge->class << 16 | bridge->interface << 8 |
418 case PCI_CACHE_LINE_SIZE:
419 *value = bridge->bist << 24 | bridge->header_type << 16 |
420 bridge->latency_timer << 8 | bridge->cache_line_size;
423 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
424 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
427 case PCI_PRIMARY_BUS:
428 *value = (bridge->secondary_latency_timer << 24 |
429 bridge->subordinate_bus << 16 |
430 bridge->secondary_bus << 8 |
431 bridge->primary_bus);
435 if (!mvebu_has_ioport(port))
436 *value = bridge->secondary_status << 16;
438 *value = (bridge->secondary_status << 16 |
439 bridge->iolimit << 8 |
443 case PCI_MEMORY_BASE:
444 *value = (bridge->memlimit << 16 | bridge->membase);
447 case PCI_PREF_MEMORY_BASE:
451 case PCI_IO_BASE_UPPER16:
452 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
455 case PCI_ROM_ADDRESS1:
459 case PCI_INTERRUPT_LINE:
460 /* LINE PIN MIN_GNT MAX_LAT */
466 return PCIBIOS_BAD_REGISTER_NUMBER;
470 *value = (*value >> (8 * (where & 3))) & 0xffff;
472 *value = (*value >> (8 * (where & 3))) & 0xff;
474 return PCIBIOS_SUCCESSFUL;
477 /* Write to the PCI-to-PCI bridge configuration space */
478 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
479 unsigned int where, int size, u32 value)
481 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
488 mask = ~(0xffff << ((where & 3) * 8));
490 mask = ~(0xff << ((where & 3) * 8));
492 return PCIBIOS_BAD_REGISTER_NUMBER;
494 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
498 value = (reg & mask) | value << ((where & 3) * 8);
500 switch (where & ~3) {
503 u32 old = bridge->command;
505 if (!mvebu_has_ioport(port))
506 value &= ~PCI_COMMAND_IO;
508 bridge->command = value & 0xffff;
509 if ((old ^ bridge->command) & PCI_COMMAND_IO)
510 mvebu_pcie_handle_iobase_change(port);
511 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
512 mvebu_pcie_handle_membase_change(port);
516 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
517 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
522 * We also keep bit 1 set, it is a read-only bit that
523 * indicates we support 32 bits addressing for the
526 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
527 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
528 mvebu_pcie_handle_iobase_change(port);
531 case PCI_MEMORY_BASE:
532 bridge->membase = value & 0xffff;
533 bridge->memlimit = value >> 16;
534 mvebu_pcie_handle_membase_change(port);
537 case PCI_IO_BASE_UPPER16:
538 bridge->iobaseupper = value & 0xffff;
539 bridge->iolimitupper = value >> 16;
540 mvebu_pcie_handle_iobase_change(port);
543 case PCI_PRIMARY_BUS:
544 bridge->primary_bus = value & 0xff;
545 bridge->secondary_bus = (value >> 8) & 0xff;
546 bridge->subordinate_bus = (value >> 16) & 0xff;
547 bridge->secondary_latency_timer = (value >> 24) & 0xff;
548 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
555 return PCIBIOS_SUCCESSFUL;
558 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
560 return sys->private_data;
563 static struct mvebu_pcie_port *
564 mvebu_pcie_find_port(struct mvebu_pcie *pcie, struct pci_bus *bus,
569 for (i = 0; i < pcie->nports; i++) {
570 struct mvebu_pcie_port *port = &pcie->ports[i];
571 if (bus->number == 0 && port->devfn == devfn)
573 if (bus->number != 0 &&
574 bus->number >= port->bridge.secondary_bus &&
575 bus->number <= port->bridge.subordinate_bus)
582 /* PCI configuration space write function */
583 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
584 int where, int size, u32 val)
586 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
587 struct mvebu_pcie_port *port;
591 port = mvebu_pcie_find_port(pcie, bus, devfn);
593 return PCIBIOS_DEVICE_NOT_FOUND;
595 /* Access the emulated PCI-to-PCI bridge */
596 if (bus->number == 0)
597 return mvebu_sw_pci_bridge_write(port, where, size, val);
599 if (!mvebu_pcie_link_up(port))
600 return PCIBIOS_DEVICE_NOT_FOUND;
603 * On the secondary bus, we don't want to expose any other
604 * device than the device physically connected in the PCIe
605 * slot, visible in slot 0. In slot 1, there's a special
606 * Marvell device that only makes sense when the Armada is
607 * used as a PCIe endpoint.
609 if (bus->number == port->bridge.secondary_bus &&
610 PCI_SLOT(devfn) != 0)
611 return PCIBIOS_DEVICE_NOT_FOUND;
613 /* Access the real PCIe interface */
614 spin_lock_irqsave(&port->conf_lock, flags);
615 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
617 spin_unlock_irqrestore(&port->conf_lock, flags);
622 /* PCI configuration space read function */
623 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
626 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
627 struct mvebu_pcie_port *port;
631 port = mvebu_pcie_find_port(pcie, bus, devfn);
634 return PCIBIOS_DEVICE_NOT_FOUND;
637 /* Access the emulated PCI-to-PCI bridge */
638 if (bus->number == 0)
639 return mvebu_sw_pci_bridge_read(port, where, size, val);
641 if (!mvebu_pcie_link_up(port)) {
643 return PCIBIOS_DEVICE_NOT_FOUND;
647 * On the secondary bus, we don't want to expose any other
648 * device than the device physically connected in the PCIe
649 * slot, visible in slot 0. In slot 1, there's a special
650 * Marvell device that only makes sense when the Armada is
651 * used as a PCIe endpoint.
653 if (bus->number == port->bridge.secondary_bus &&
654 PCI_SLOT(devfn) != 0) {
656 return PCIBIOS_DEVICE_NOT_FOUND;
659 /* Access the real PCIe interface */
660 spin_lock_irqsave(&port->conf_lock, flags);
661 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
663 spin_unlock_irqrestore(&port->conf_lock, flags);
668 static struct pci_ops mvebu_pcie_ops = {
669 .read = mvebu_pcie_rd_conf,
670 .write = mvebu_pcie_wr_conf,
673 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
675 struct mvebu_pcie *pcie = sys_to_pcie(sys);
679 #ifdef CONFIG_PCI_DOMAINS
680 domain = sys->domain;
683 snprintf(pcie->mem_name, sizeof(pcie->mem_name), "PCI MEM %04x",
685 pcie->mem.name = pcie->mem_name;
687 snprintf(pcie->io_name, sizeof(pcie->io_name), "PCI I/O %04x", domain);
688 pcie->realio.name = pcie->io_name;
690 if (request_resource(&iomem_resource, &pcie->mem))
693 if (resource_size(&pcie->realio) != 0) {
694 if (request_resource(&ioport_resource, &pcie->realio)) {
695 release_resource(&pcie->mem);
698 pci_add_resource_offset(&sys->resources, &pcie->realio,
701 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
702 pci_add_resource(&sys->resources, &pcie->busn);
704 for (i = 0; i < pcie->nports; i++) {
705 struct mvebu_pcie_port *port = &pcie->ports[i];
708 mvebu_pcie_setup_hw(port);
714 static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
716 struct mvebu_pcie *pcie = sys_to_pcie(sys);
719 bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
720 &mvebu_pcie_ops, sys, &sys->resources);
724 pci_scan_child_bus(bus);
729 static void mvebu_pcie_add_bus(struct pci_bus *bus)
731 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
732 bus->msi = pcie->msi;
735 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
736 const struct resource *res,
737 resource_size_t start,
738 resource_size_t size,
739 resource_size_t align)
741 if (dev->bus->number != 0)
745 * On the PCI-to-PCI bridge side, the I/O windows must have at
746 * least a 64 KB size and be aligned on their size, and the
747 * memory windows must have at least a 1 MB size and be
748 * aligned on their size
750 if (res->flags & IORESOURCE_IO)
751 return round_up(start, max_t(resource_size_t, SZ_64K, size));
752 else if (res->flags & IORESOURCE_MEM)
753 return round_up(start, max_t(resource_size_t, SZ_1M, size));
758 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
762 memset(&hw, 0, sizeof(hw));
764 hw.nr_controllers = 1;
765 hw.private_data = (void **)&pcie;
766 hw.setup = mvebu_pcie_setup;
767 hw.scan = mvebu_pcie_scan_bus;
768 hw.map_irq = of_irq_parse_and_map_pci;
769 hw.ops = &mvebu_pcie_ops;
770 hw.align_resource = mvebu_pcie_align_resource;
771 hw.add_bus = mvebu_pcie_add_bus;
773 pci_common_init(&hw);
777 * Looks up the list of register addresses encoded into the reg =
778 * <...> property for one that matches the given port/lane. Once
781 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
782 struct device_node *np, struct mvebu_pcie_port *port)
784 struct resource regs;
787 ret = of_address_to_resource(np, 0, ®s);
791 return devm_ioremap_resource(&pdev->dev, ®s);
794 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
795 #define DT_TYPE_IO 0x1
796 #define DT_TYPE_MEM32 0x2
797 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
798 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
800 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
805 const int na = 3, ns = 2;
807 int rlen, nranges, rangesz, pna, i;
812 range = of_get_property(np, "ranges", &rlen);
816 pna = of_n_addr_cells(np);
817 rangesz = pna + na + ns;
818 nranges = rlen / sizeof(__be32) / rangesz;
820 for (i = 0; i < nranges; i++) {
821 u32 flags = of_read_number(range, 1);
822 u32 slot = of_read_number(range + 1, 1);
823 u64 cpuaddr = of_read_number(range + na, pna);
826 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
827 rtype = IORESOURCE_IO;
828 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
829 rtype = IORESOURCE_MEM;
831 if (slot == PCI_SLOT(devfn) && type == rtype) {
832 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
833 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
843 static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
845 struct device_node *msi_node;
847 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
852 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
855 pcie->msi->dev = &pcie->pdev->dev;
858 static int mvebu_pcie_probe(struct platform_device *pdev)
860 struct mvebu_pcie *pcie;
861 struct device_node *np = pdev->dev.of_node;
862 struct device_node *child;
865 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
871 platform_set_drvdata(pdev, pcie);
873 /* Get the PCIe memory and I/O aperture */
874 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
875 if (resource_size(&pcie->mem) == 0) {
876 dev_err(&pdev->dev, "invalid memory aperture size\n");
880 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
882 if (resource_size(&pcie->io) != 0) {
883 pcie->realio.flags = pcie->io.flags;
884 pcie->realio.start = PCIBIOS_MIN_IO;
885 pcie->realio.end = min_t(resource_size_t,
887 resource_size(&pcie->io));
889 pcie->realio = pcie->io;
891 /* Get the bus range */
892 ret = of_pci_parse_bus_range(np, &pcie->busn);
894 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
900 for_each_child_of_node(pdev->dev.of_node, child) {
901 if (!of_device_is_available(child))
906 pcie->ports = devm_kzalloc(&pdev->dev, i *
907 sizeof(struct mvebu_pcie_port),
913 for_each_child_of_node(pdev->dev.of_node, child) {
914 struct mvebu_pcie_port *port = &pcie->ports[i];
915 enum of_gpio_flags flags;
917 if (!of_device_is_available(child))
922 if (of_property_read_u32(child, "marvell,pcie-port",
925 "ignoring PCIe DT node, missing pcie-port property\n");
929 if (of_property_read_u32(child, "marvell,pcie-lane",
933 port->name = kasprintf(GFP_KERNEL, "pcie%d.%d",
934 port->port, port->lane);
936 port->devfn = of_pci_get_devfn(child);
940 ret = mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_MEM,
941 &port->mem_target, &port->mem_attr);
943 dev_err(&pdev->dev, "PCIe%d.%d: cannot get tgt/attr for mem window\n",
944 port->port, port->lane);
948 if (resource_size(&pcie->io) != 0)
949 mvebu_get_tgt_attr(np, port->devfn, IORESOURCE_IO,
950 &port->io_target, &port->io_attr);
952 port->io_target = -1;
956 port->reset_gpio = of_get_named_gpio_flags(child,
957 "reset-gpios", 0, &flags);
958 if (gpio_is_valid(port->reset_gpio)) {
959 u32 reset_udelay = 20000;
961 port->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
962 port->reset_name = kasprintf(GFP_KERNEL,
963 "pcie%d.%d-reset", port->port, port->lane);
964 of_property_read_u32(child, "reset-delay-us",
967 ret = devm_gpio_request_one(&pdev->dev,
968 port->reset_gpio, GPIOF_DIR_OUT, port->reset_name);
970 if (ret == -EPROBE_DEFER)
975 gpio_set_value(port->reset_gpio,
976 (port->reset_active_low) ? 1 : 0);
977 msleep(reset_udelay/1000);
980 port->clk = of_clk_get_by_name(child, NULL);
981 if (IS_ERR(port->clk)) {
982 dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
983 port->port, port->lane);
987 ret = clk_prepare_enable(port->clk);
991 port->base = mvebu_pcie_map_registers(pdev, child, port);
992 if (IS_ERR(port->base)) {
993 dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
994 port->port, port->lane);
996 clk_disable_unprepare(port->clk);
1000 mvebu_pcie_set_local_dev_nr(port, 1);
1003 spin_lock_init(&port->conf_lock);
1004 mvebu_sw_pci_bridge_init(port);
1010 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1011 pci_ioremap_io(i, pcie->io.start + i);
1013 mvebu_pcie_msi_enable(pcie);
1014 mvebu_pcie_enable(pcie);
1019 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1020 { .compatible = "marvell,armada-xp-pcie", },
1021 { .compatible = "marvell,armada-370-pcie", },
1022 { .compatible = "marvell,dove-pcie", },
1023 { .compatible = "marvell,kirkwood-pcie", },
1026 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
1028 static struct platform_driver mvebu_pcie_driver = {
1030 .owner = THIS_MODULE,
1031 .name = "mvebu-pcie",
1032 .of_match_table = mvebu_pcie_of_match_table,
1033 /* driver unloading/unbinding currently not supported */
1034 .suppress_bind_attrs = true,
1036 .probe = mvebu_pcie_probe,
1038 module_platform_driver(mvebu_pcie_driver);
1040 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
1041 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
1042 MODULE_LICENSE("GPLv2");