2 * PCIe driver for Marvell Armada 370 and Armada XP SoCs
4 * Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/clk.h>
14 #include <linux/delay.h>
15 #include <linux/gpio.h>
16 #include <linux/init.h>
17 #include <linux/mbus.h>
18 #include <linux/msi.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/of_address.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_gpio.h>
24 #include <linux/of_pci.h>
25 #include <linux/of_platform.h>
28 * PCIe unit register offsets.
30 #define PCIE_DEV_ID_OFF 0x0000
31 #define PCIE_CMD_OFF 0x0004
32 #define PCIE_DEV_REV_OFF 0x0008
33 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
34 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
35 #define PCIE_CAP_PCIEXP 0x0060
36 #define PCIE_HEADER_LOG_4_OFF 0x0128
37 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
38 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
39 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
40 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
41 #define PCIE_WIN5_CTRL_OFF 0x1880
42 #define PCIE_WIN5_BASE_OFF 0x1884
43 #define PCIE_WIN5_REMAP_OFF 0x188c
44 #define PCIE_CONF_ADDR_OFF 0x18f8
45 #define PCIE_CONF_ADDR_EN 0x80000000
46 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
47 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
48 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
49 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
50 #define PCIE_CONF_ADDR(bus, devfn, where) \
51 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
52 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
54 #define PCIE_CONF_DATA_OFF 0x18fc
55 #define PCIE_MASK_OFF 0x1910
56 #define PCIE_MASK_ENABLE_INTS 0x0f000000
57 #define PCIE_CTRL_OFF 0x1a00
58 #define PCIE_CTRL_X1_MODE 0x0001
59 #define PCIE_STAT_OFF 0x1a04
60 #define PCIE_STAT_BUS 0xff00
61 #define PCIE_STAT_DEV 0x1f0000
62 #define PCIE_STAT_LINK_DOWN BIT(0)
63 #define PCIE_RC_RTSTA 0x1a14
64 #define PCIE_DEBUG_CTRL 0x1a60
65 #define PCIE_DEBUG_SOFT_RESET BIT(20)
68 PCISWCAP = PCI_BRIDGE_CONTROL + 2,
69 PCISWCAP_EXP_LIST_ID = PCISWCAP + PCI_CAP_LIST_ID,
70 PCISWCAP_EXP_DEVCAP = PCISWCAP + PCI_EXP_DEVCAP,
71 PCISWCAP_EXP_DEVCTL = PCISWCAP + PCI_EXP_DEVCTL,
72 PCISWCAP_EXP_LNKCAP = PCISWCAP + PCI_EXP_LNKCAP,
73 PCISWCAP_EXP_LNKCTL = PCISWCAP + PCI_EXP_LNKCTL,
74 PCISWCAP_EXP_SLTCAP = PCISWCAP + PCI_EXP_SLTCAP,
75 PCISWCAP_EXP_SLTCTL = PCISWCAP + PCI_EXP_SLTCTL,
76 PCISWCAP_EXP_RTCTL = PCISWCAP + PCI_EXP_RTCTL,
77 PCISWCAP_EXP_RTSTA = PCISWCAP + PCI_EXP_RTSTA,
78 PCISWCAP_EXP_DEVCAP2 = PCISWCAP + PCI_EXP_DEVCAP2,
79 PCISWCAP_EXP_DEVCTL2 = PCISWCAP + PCI_EXP_DEVCTL2,
80 PCISWCAP_EXP_LNKCAP2 = PCISWCAP + PCI_EXP_LNKCAP2,
81 PCISWCAP_EXP_LNKCTL2 = PCISWCAP + PCI_EXP_LNKCTL2,
82 PCISWCAP_EXP_SLTCAP2 = PCISWCAP + PCI_EXP_SLTCAP2,
83 PCISWCAP_EXP_SLTCTL2 = PCISWCAP + PCI_EXP_SLTCTL2,
86 /* PCI configuration space of a PCI-to-PCI bridge */
87 struct mvebu_sw_pci_bridge {
103 u8 secondary_latency_timer;
106 u16 secondary_status;
116 /* PCI express capability */
122 struct mvebu_pcie_port;
124 /* Structure representing all PCIe interfaces */
126 struct platform_device *pdev;
127 struct mvebu_pcie_port *ports;
128 struct msi_controller *msi;
130 struct resource realio;
132 struct resource busn;
136 struct mvebu_pcie_window {
142 /* Structure representing one PCIe interface */
143 struct mvebu_pcie_port {
149 unsigned int mem_target;
150 unsigned int mem_attr;
151 unsigned int io_target;
152 unsigned int io_attr;
154 struct gpio_desc *reset_gpio;
156 struct mvebu_sw_pci_bridge bridge;
157 struct device_node *dn;
158 struct mvebu_pcie *pcie;
159 struct mvebu_pcie_window memwin;
160 struct mvebu_pcie_window iowin;
164 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
166 writel(val, port->base + reg);
169 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
171 return readl(port->base + reg);
174 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
176 return port->io_target != -1 && port->io_attr != -1;
179 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
181 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
184 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
188 stat = mvebu_readl(port, PCIE_STAT_OFF);
189 stat &= ~PCIE_STAT_BUS;
191 mvebu_writel(port, stat, PCIE_STAT_OFF);
194 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
198 stat = mvebu_readl(port, PCIE_STAT_OFF);
199 stat &= ~PCIE_STAT_DEV;
201 mvebu_writel(port, stat, PCIE_STAT_OFF);
205 * Setup PCIE BARs and Address Decode Wins:
206 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
207 * WIN[0-3] -> DRAM bank[0-3]
209 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
211 const struct mbus_dram_target_info *dram;
215 dram = mv_mbus_dram_info();
217 /* First, disable and clear BARs and windows. */
218 for (i = 1; i < 3; i++) {
219 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
220 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
221 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
224 for (i = 0; i < 5; i++) {
225 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
226 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
227 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
230 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
231 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
232 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
234 /* Setup windows for DDR banks. Count total DDR size on the fly. */
236 for (i = 0; i < dram->num_cs; i++) {
237 const struct mbus_dram_window *cs = dram->cs + i;
239 mvebu_writel(port, cs->base & 0xffff0000,
240 PCIE_WIN04_BASE_OFF(i));
241 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
243 ((cs->size - 1) & 0xffff0000) |
244 (cs->mbus_attr << 8) |
245 (dram->mbus_dram_target_id << 4) | 1,
246 PCIE_WIN04_CTRL_OFF(i));
251 /* Round up 'size' to the nearest power of two. */
252 if ((size & (size - 1)) != 0)
253 size = 1 << fls(size);
255 /* Setup BAR[1] to all DRAM banks. */
256 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
257 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
258 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
259 PCIE_BAR_CTRL_OFF(1));
262 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
266 /* Point PCIe unit MBUS decode windows to DRAM space. */
267 mvebu_pcie_setup_wins(port);
269 /* Master + slave enable. */
270 cmd = mvebu_readl(port, PCIE_CMD_OFF);
271 cmd |= PCI_COMMAND_IO;
272 cmd |= PCI_COMMAND_MEMORY;
273 cmd |= PCI_COMMAND_MASTER;
274 mvebu_writel(port, cmd, PCIE_CMD_OFF);
276 /* Enable interrupt lines A-D. */
277 mask = mvebu_readl(port, PCIE_MASK_OFF);
278 mask |= PCIE_MASK_ENABLE_INTS;
279 mvebu_writel(port, mask, PCIE_MASK_OFF);
282 static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
284 u32 devfn, int where, int size, u32 *val)
286 void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
288 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
293 *val = readb_relaxed(conf_data + (where & 3));
296 *val = readw_relaxed(conf_data + (where & 2));
299 *val = readl_relaxed(conf_data);
303 return PCIBIOS_SUCCESSFUL;
306 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
308 u32 devfn, int where, int size, u32 val)
310 void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
312 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
317 writeb(val, conf_data + (where & 3));
320 writew(val, conf_data + (where & 2));
323 writel(val, conf_data);
326 return PCIBIOS_BAD_REGISTER_NUMBER;
329 return PCIBIOS_SUCCESSFUL;
333 * Remove windows, starting from the largest ones to the smallest
336 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
337 phys_addr_t base, size_t size)
340 size_t sz = 1 << (fls(size) - 1);
342 mvebu_mbus_del_window(base, sz);
349 * MBus windows can only have a power of two size, but PCI BARs do not
350 * have this constraint. Therefore, we have to split the PCI BAR into
351 * areas each having a power of two size. We start from the largest
352 * one (i.e highest order bit set in the size).
354 static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
355 unsigned int target, unsigned int attribute,
356 phys_addr_t base, size_t size,
359 size_t size_mapped = 0;
362 size_t sz = 1 << (fls(size) - 1);
365 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
368 phys_addr_t end = base + sz - 1;
370 dev_err(&port->pcie->pdev->dev,
371 "Could not create MBus window at [mem %pa-%pa]: %d\n",
373 mvebu_pcie_del_windows(port, base - size_mapped,
381 if (remap != MVEBU_MBUS_NO_REMAP)
386 static void mvebu_pcie_set_window(struct mvebu_pcie_port *port,
387 unsigned int target, unsigned int attribute,
388 const struct mvebu_pcie_window *desired,
389 struct mvebu_pcie_window *cur)
391 if (desired->base == cur->base && desired->remap == cur->remap &&
392 desired->size == cur->size)
395 if (cur->size != 0) {
396 mvebu_pcie_del_windows(port, cur->base, cur->size);
401 * If something tries to change the window while it is enabled
402 * the change will not be done atomically. That would be
403 * difficult to do in the general case.
407 if (desired->size == 0)
410 mvebu_pcie_add_windows(port, target, attribute, desired->base,
411 desired->size, desired->remap);
415 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
417 struct mvebu_pcie_window desired = {};
419 /* Are the new iobase/iolimit values invalid? */
420 if (port->bridge.iolimit < port->bridge.iobase ||
421 port->bridge.iolimitupper < port->bridge.iobaseupper ||
422 !(port->bridge.command & PCI_COMMAND_IO)) {
423 mvebu_pcie_set_window(port, port->io_target, port->io_attr,
424 &desired, &port->iowin);
428 if (!mvebu_has_ioport(port)) {
429 dev_WARN(&port->pcie->pdev->dev,
430 "Attempt to set IO when IO is disabled\n");
435 * We read the PCI-to-PCI bridge emulated registers, and
436 * calculate the base address and size of the address decoding
437 * window to setup, according to the PCI-to-PCI bridge
438 * specifications. iobase is the bus address, port->iowin_base
439 * is the CPU address.
441 desired.remap = ((port->bridge.iobase & 0xF0) << 8) |
442 (port->bridge.iobaseupper << 16);
443 desired.base = port->pcie->io.start + desired.remap;
444 desired.size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
445 (port->bridge.iolimitupper << 16)) -
449 mvebu_pcie_set_window(port, port->io_target, port->io_attr, &desired,
453 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
455 struct mvebu_pcie_window desired = {.remap = MVEBU_MBUS_NO_REMAP};
457 /* Are the new membase/memlimit values invalid? */
458 if (port->bridge.memlimit < port->bridge.membase ||
459 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
460 mvebu_pcie_set_window(port, port->mem_target, port->mem_attr,
461 &desired, &port->memwin);
466 * We read the PCI-to-PCI bridge emulated registers, and
467 * calculate the base address and size of the address decoding
468 * window to setup, according to the PCI-to-PCI bridge
471 desired.base = ((port->bridge.membase & 0xFFF0) << 16);
472 desired.size = (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
475 mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, &desired,
480 * Initialize the configuration space of the PCI-to-PCI bridge
481 * associated with the given PCIe interface.
483 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
485 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
487 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
489 bridge->class = PCI_CLASS_BRIDGE_PCI;
490 bridge->vendor = PCI_VENDOR_ID_MARVELL;
491 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
492 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
493 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
494 bridge->cache_line_size = 0x10;
496 /* We support 32 bits I/O addressing */
497 bridge->iobase = PCI_IO_RANGE_TYPE_32;
498 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
500 /* Add capabilities */
501 bridge->status = PCI_STATUS_CAP_LIST;
505 * Read the configuration space of the PCI-to-PCI bridge associated to
506 * the given PCIe interface.
508 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
509 unsigned int where, int size, u32 *value)
511 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
513 switch (where & ~3) {
515 *value = bridge->device << 16 | bridge->vendor;
519 *value = bridge->command | bridge->status << 16;
522 case PCI_CLASS_REVISION:
523 *value = bridge->class << 16 | bridge->interface << 8 |
527 case PCI_CACHE_LINE_SIZE:
528 *value = bridge->bist << 24 | bridge->header_type << 16 |
529 bridge->latency_timer << 8 | bridge->cache_line_size;
532 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
533 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
536 case PCI_PRIMARY_BUS:
537 *value = (bridge->secondary_latency_timer << 24 |
538 bridge->subordinate_bus << 16 |
539 bridge->secondary_bus << 8 |
540 bridge->primary_bus);
544 if (!mvebu_has_ioport(port))
545 *value = bridge->secondary_status << 16;
547 *value = (bridge->secondary_status << 16 |
548 bridge->iolimit << 8 |
552 case PCI_MEMORY_BASE:
553 *value = (bridge->memlimit << 16 | bridge->membase);
556 case PCI_PREF_MEMORY_BASE:
560 case PCI_IO_BASE_UPPER16:
561 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
564 case PCI_CAPABILITY_LIST:
568 case PCI_ROM_ADDRESS1:
572 case PCI_INTERRUPT_LINE:
573 /* LINE PIN MIN_GNT MAX_LAT */
577 case PCISWCAP_EXP_LIST_ID:
578 /* Set PCIe v2, root port, slot support */
579 *value = (PCI_EXP_TYPE_ROOT_PORT << 4 | 2 |
580 PCI_EXP_FLAGS_SLOT) << 16 | PCI_CAP_ID_EXP;
583 case PCISWCAP_EXP_DEVCAP:
584 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP);
587 case PCISWCAP_EXP_DEVCTL:
588 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL) &
589 ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
590 PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
591 *value |= bridge->pcie_devctl;
594 case PCISWCAP_EXP_LNKCAP:
596 * PCIe requires the clock power management capability to be
597 * hard-wired to zero for downstream ports
599 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
600 ~PCI_EXP_LNKCAP_CLKPM;
603 case PCISWCAP_EXP_LNKCTL:
604 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
607 case PCISWCAP_EXP_SLTCAP:
608 *value = bridge->pcie_sltcap;
611 case PCISWCAP_EXP_SLTCTL:
612 *value = PCI_EXP_SLTSTA_PDS << 16;
615 case PCISWCAP_EXP_RTCTL:
616 *value = bridge->pcie_rtctl;
619 case PCISWCAP_EXP_RTSTA:
620 *value = mvebu_readl(port, PCIE_RC_RTSTA);
623 /* PCIe requires the v2 fields to be hard-wired to zero */
624 case PCISWCAP_EXP_DEVCAP2:
625 case PCISWCAP_EXP_DEVCTL2:
626 case PCISWCAP_EXP_LNKCAP2:
627 case PCISWCAP_EXP_LNKCTL2:
628 case PCISWCAP_EXP_SLTCAP2:
629 case PCISWCAP_EXP_SLTCTL2:
632 * PCI defines configuration read accesses to reserved or
633 * unimplemented registers to read as zero and complete
637 return PCIBIOS_SUCCESSFUL;
641 *value = (*value >> (8 * (where & 3))) & 0xffff;
643 *value = (*value >> (8 * (where & 3))) & 0xff;
645 return PCIBIOS_SUCCESSFUL;
648 /* Write to the PCI-to-PCI bridge configuration space */
649 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
650 unsigned int where, int size, u32 value)
652 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
659 mask = ~(0xffff << ((where & 3) * 8));
661 mask = ~(0xff << ((where & 3) * 8));
663 return PCIBIOS_BAD_REGISTER_NUMBER;
665 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
669 value = (reg & mask) | value << ((where & 3) * 8);
671 switch (where & ~3) {
674 u32 old = bridge->command;
676 if (!mvebu_has_ioport(port))
677 value &= ~PCI_COMMAND_IO;
679 bridge->command = value & 0xffff;
680 if ((old ^ bridge->command) & PCI_COMMAND_IO)
681 mvebu_pcie_handle_iobase_change(port);
682 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
683 mvebu_pcie_handle_membase_change(port);
687 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
688 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
693 * We also keep bit 1 set, it is a read-only bit that
694 * indicates we support 32 bits addressing for the
697 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
698 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
699 mvebu_pcie_handle_iobase_change(port);
702 case PCI_MEMORY_BASE:
703 bridge->membase = value & 0xffff;
704 bridge->memlimit = value >> 16;
705 mvebu_pcie_handle_membase_change(port);
708 case PCI_IO_BASE_UPPER16:
709 bridge->iobaseupper = value & 0xffff;
710 bridge->iolimitupper = value >> 16;
711 mvebu_pcie_handle_iobase_change(port);
714 case PCI_PRIMARY_BUS:
715 bridge->primary_bus = value & 0xff;
716 bridge->secondary_bus = (value >> 8) & 0xff;
717 bridge->subordinate_bus = (value >> 16) & 0xff;
718 bridge->secondary_latency_timer = (value >> 24) & 0xff;
719 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
722 case PCISWCAP_EXP_DEVCTL:
724 * Armada370 data says these bits must always
725 * be zero when in root complex mode.
727 value &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
728 PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
731 * If the mask is 0xffff0000, then we only want to write
732 * the device control register, rather than clearing the
733 * RW1C bits in the device status register. Mask out the
734 * status register bits.
736 if (mask == 0xffff0000)
739 mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
742 case PCISWCAP_EXP_LNKCTL:
744 * If we don't support CLKREQ, we must ensure that the
745 * CLKREQ enable bit always reads zero. Since we haven't
746 * had this capability, and it's dependent on board wiring,
747 * disable it for the time being.
749 value &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
752 * If the mask is 0xffff0000, then we only want to write
753 * the link control register, rather than clearing the
754 * RW1C bits in the link status register. Mask out the
755 * RW1C status register bits.
757 if (mask == 0xffff0000)
758 value &= ~((PCI_EXP_LNKSTA_LABS |
759 PCI_EXP_LNKSTA_LBMS) << 16);
761 mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
764 case PCISWCAP_EXP_RTSTA:
765 mvebu_writel(port, value, PCIE_RC_RTSTA);
772 return PCIBIOS_SUCCESSFUL;
775 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
777 return sys->private_data;
780 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
786 for (i = 0; i < pcie->nports; i++) {
787 struct mvebu_pcie_port *port = &pcie->ports[i];
789 if (bus->number == 0 && port->devfn == devfn)
791 if (bus->number != 0 &&
792 bus->number >= port->bridge.secondary_bus &&
793 bus->number <= port->bridge.subordinate_bus)
800 /* PCI configuration space write function */
801 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
802 int where, int size, u32 val)
804 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
805 struct mvebu_pcie_port *port;
808 port = mvebu_pcie_find_port(pcie, bus, devfn);
810 return PCIBIOS_DEVICE_NOT_FOUND;
812 /* Access the emulated PCI-to-PCI bridge */
813 if (bus->number == 0)
814 return mvebu_sw_pci_bridge_write(port, where, size, val);
816 if (!mvebu_pcie_link_up(port))
817 return PCIBIOS_DEVICE_NOT_FOUND;
819 /* Access the real PCIe interface */
820 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
826 /* PCI configuration space read function */
827 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
830 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
831 struct mvebu_pcie_port *port;
834 port = mvebu_pcie_find_port(pcie, bus, devfn);
837 return PCIBIOS_DEVICE_NOT_FOUND;
840 /* Access the emulated PCI-to-PCI bridge */
841 if (bus->number == 0)
842 return mvebu_sw_pci_bridge_read(port, where, size, val);
844 if (!mvebu_pcie_link_up(port)) {
846 return PCIBIOS_DEVICE_NOT_FOUND;
849 /* Access the real PCIe interface */
850 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
856 static struct pci_ops mvebu_pcie_ops = {
857 .read = mvebu_pcie_rd_conf,
858 .write = mvebu_pcie_wr_conf,
861 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
863 struct mvebu_pcie *pcie = sys_to_pcie(sys);
866 pcie->mem.name = "PCI MEM";
867 pcie->realio.name = "PCI I/O";
869 if (resource_size(&pcie->realio) != 0)
870 pci_add_resource_offset(&sys->resources, &pcie->realio,
873 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
874 pci_add_resource(&sys->resources, &pcie->busn);
876 err = devm_request_pci_bus_resources(&pcie->pdev->dev, &sys->resources);
880 for (i = 0; i < pcie->nports; i++) {
881 struct mvebu_pcie_port *port = &pcie->ports[i];
885 mvebu_pcie_setup_hw(port);
891 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
892 const struct resource *res,
893 resource_size_t start,
894 resource_size_t size,
895 resource_size_t align)
897 if (dev->bus->number != 0)
901 * On the PCI-to-PCI bridge side, the I/O windows must have at
902 * least a 64 KB size and the memory windows must have at
903 * least a 1 MB size. Moreover, MBus windows need to have a
904 * base address aligned on their size, and their size must be
905 * a power of two. This means that if the BAR doesn't have a
906 * power of two size, several MBus windows will actually be
907 * created. We need to ensure that the biggest MBus window
908 * (which will be the first one) is aligned on its size, which
909 * explains the rounddown_pow_of_two() being done here.
911 if (res->flags & IORESOURCE_IO)
912 return round_up(start, max_t(resource_size_t, SZ_64K,
913 rounddown_pow_of_two(size)));
914 else if (res->flags & IORESOURCE_MEM)
915 return round_up(start, max_t(resource_size_t, SZ_1M,
916 rounddown_pow_of_two(size)));
921 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
925 memset(&hw, 0, sizeof(hw));
927 #ifdef CONFIG_PCI_MSI
928 hw.msi_ctrl = pcie->msi;
931 hw.nr_controllers = 1;
932 hw.private_data = (void **)&pcie;
933 hw.setup = mvebu_pcie_setup;
934 hw.map_irq = of_irq_parse_and_map_pci;
935 hw.ops = &mvebu_pcie_ops;
936 hw.align_resource = mvebu_pcie_align_resource;
938 pci_common_init_dev(&pcie->pdev->dev, &hw);
942 * Looks up the list of register addresses encoded into the reg =
943 * <...> property for one that matches the given port/lane. Once
946 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
947 struct device_node *np,
948 struct mvebu_pcie_port *port)
950 struct resource regs;
953 ret = of_address_to_resource(np, 0, ®s);
957 return devm_ioremap_resource(&pdev->dev, ®s);
960 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
961 #define DT_TYPE_IO 0x1
962 #define DT_TYPE_MEM32 0x2
963 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
964 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
966 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
971 const int na = 3, ns = 2;
973 int rlen, nranges, rangesz, pna, i;
978 range = of_get_property(np, "ranges", &rlen);
982 pna = of_n_addr_cells(np);
983 rangesz = pna + na + ns;
984 nranges = rlen / sizeof(__be32) / rangesz;
986 for (i = 0; i < nranges; i++, range += rangesz) {
987 u32 flags = of_read_number(range, 1);
988 u32 slot = of_read_number(range + 1, 1);
989 u64 cpuaddr = of_read_number(range + na, pna);
992 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
993 rtype = IORESOURCE_IO;
994 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
995 rtype = IORESOURCE_MEM;
999 if (slot == PCI_SLOT(devfn) && type == rtype) {
1000 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
1001 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
1009 #ifdef CONFIG_PM_SLEEP
1010 static int mvebu_pcie_suspend(struct device *dev)
1012 struct mvebu_pcie *pcie;
1015 pcie = dev_get_drvdata(dev);
1016 for (i = 0; i < pcie->nports; i++) {
1017 struct mvebu_pcie_port *port = pcie->ports + i;
1018 port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
1024 static int mvebu_pcie_resume(struct device *dev)
1026 struct mvebu_pcie *pcie;
1029 pcie = dev_get_drvdata(dev);
1030 for (i = 0; i < pcie->nports; i++) {
1031 struct mvebu_pcie_port *port = pcie->ports + i;
1032 mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
1033 mvebu_pcie_setup_hw(port);
1040 static void mvebu_pcie_port_clk_put(void *data)
1042 struct mvebu_pcie_port *port = data;
1047 static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
1048 struct mvebu_pcie_port *port, struct device_node *child)
1050 struct device *dev = &pcie->pdev->dev;
1051 enum of_gpio_flags flags;
1052 int reset_gpio, ret;
1056 if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) {
1057 dev_warn(dev, "ignoring %s, missing pcie-port property\n",
1058 of_node_full_name(child));
1062 if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane))
1065 port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port,
1072 port->devfn = of_pci_get_devfn(child);
1073 if (port->devfn < 0)
1076 ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
1077 &port->mem_target, &port->mem_attr);
1079 dev_err(dev, "%s: cannot get tgt/attr for mem window\n",
1084 if (resource_size(&pcie->io) != 0) {
1085 mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO,
1086 &port->io_target, &port->io_attr);
1088 port->io_target = -1;
1092 reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags);
1093 if (reset_gpio == -EPROBE_DEFER) {
1098 if (gpio_is_valid(reset_gpio)) {
1099 unsigned long gpio_flags;
1101 port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset",
1103 if (!port->reset_name) {
1108 if (flags & OF_GPIO_ACTIVE_LOW) {
1109 dev_info(dev, "%s: reset gpio is active low\n",
1110 of_node_full_name(child));
1111 gpio_flags = GPIOF_ACTIVE_LOW |
1114 gpio_flags = GPIOF_OUT_INIT_HIGH;
1117 ret = devm_gpio_request_one(dev, reset_gpio, gpio_flags,
1120 if (ret == -EPROBE_DEFER)
1125 port->reset_gpio = gpio_to_desc(reset_gpio);
1128 port->clk = of_clk_get_by_name(child, NULL);
1129 if (IS_ERR(port->clk)) {
1130 dev_err(dev, "%s: cannot get clock\n", port->name);
1134 ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
1145 /* In the case of skipping, we need to free these */
1146 devm_kfree(dev, port->reset_name);
1147 port->reset_name = NULL;
1148 devm_kfree(dev, port->name);
1156 * Power up a PCIe port. PCIe requires the refclk to be stable for 100µs
1157 * prior to releasing PERST. See table 2-4 in section 2.6.2 AC Specifications
1158 * of the PCI Express Card Electromechanical Specification, 1.1.
1160 static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
1164 ret = clk_prepare_enable(port->clk);
1168 if (port->reset_gpio) {
1169 u32 reset_udelay = PCI_PM_D3COLD_WAIT * 1000;
1171 of_property_read_u32(port->dn, "reset-delay-us",
1176 gpiod_set_value_cansleep(port->reset_gpio, 0);
1177 msleep(reset_udelay / 1000);
1184 * Power down a PCIe port. Strictly, PCIe requires us to place the card
1185 * in D3hot state before asserting PERST#.
1187 static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
1189 if (port->reset_gpio)
1190 gpiod_set_value_cansleep(port->reset_gpio, 1);
1192 clk_disable_unprepare(port->clk);
1195 static int mvebu_pcie_probe(struct platform_device *pdev)
1197 struct device *dev = &pdev->dev;
1198 struct mvebu_pcie *pcie;
1199 struct device_node *np = dev->of_node;
1200 struct device_node *child;
1203 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1208 platform_set_drvdata(pdev, pcie);
1210 /* Get the PCIe memory and I/O aperture */
1211 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
1212 if (resource_size(&pcie->mem) == 0) {
1213 dev_err(dev, "invalid memory aperture size\n");
1217 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
1219 if (resource_size(&pcie->io) != 0) {
1220 pcie->realio.flags = pcie->io.flags;
1221 pcie->realio.start = PCIBIOS_MIN_IO;
1222 pcie->realio.end = min_t(resource_size_t,
1224 resource_size(&pcie->io));
1226 pcie->realio = pcie->io;
1228 /* Get the bus range */
1229 ret = of_pci_parse_bus_range(np, &pcie->busn);
1231 dev_err(dev, "failed to parse bus-range property: %d\n", ret);
1235 num = of_get_available_child_count(np);
1237 pcie->ports = devm_kcalloc(dev, num, sizeof(*pcie->ports), GFP_KERNEL);
1242 for_each_available_child_of_node(np, child) {
1243 struct mvebu_pcie_port *port = &pcie->ports[i];
1245 ret = mvebu_pcie_parse_port(pcie, port, child);
1249 } else if (ret == 0) {
1258 for (i = 0; i < pcie->nports; i++) {
1259 struct mvebu_pcie_port *port = &pcie->ports[i];
1265 ret = mvebu_pcie_powerup(port);
1269 port->base = mvebu_pcie_map_registers(pdev, child, port);
1270 if (IS_ERR(port->base)) {
1271 dev_err(dev, "%s: cannot map registers\n", port->name);
1273 mvebu_pcie_powerdown(port);
1277 mvebu_pcie_set_local_dev_nr(port, 1);
1278 mvebu_sw_pci_bridge_init(port);
1283 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1284 pci_ioremap_io(i, pcie->io.start + i);
1286 mvebu_pcie_enable(pcie);
1288 platform_set_drvdata(pdev, pcie);
1293 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1294 { .compatible = "marvell,armada-xp-pcie", },
1295 { .compatible = "marvell,armada-370-pcie", },
1296 { .compatible = "marvell,dove-pcie", },
1297 { .compatible = "marvell,kirkwood-pcie", },
1301 static const struct dev_pm_ops mvebu_pcie_pm_ops = {
1302 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mvebu_pcie_suspend, mvebu_pcie_resume)
1305 static struct platform_driver mvebu_pcie_driver = {
1307 .name = "mvebu-pcie",
1308 .of_match_table = mvebu_pcie_of_match_table,
1309 /* driver unloading/unbinding currently not supported */
1310 .suppress_bind_attrs = true,
1311 .pm = &mvebu_pcie_pm_ops,
1313 .probe = mvebu_pcie_probe,
1315 builtin_platform_driver(mvebu_pcie_driver);