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_CAP_PCIEXP 0x0060
34 #define PCIE_HEADER_LOG_4_OFF 0x0128
35 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
36 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
37 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
38 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
39 #define PCIE_WIN5_CTRL_OFF 0x1880
40 #define PCIE_WIN5_BASE_OFF 0x1884
41 #define PCIE_WIN5_REMAP_OFF 0x188c
42 #define PCIE_CONF_ADDR_OFF 0x18f8
43 #define PCIE_CONF_ADDR_EN 0x80000000
44 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
45 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
46 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
47 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
48 #define PCIE_CONF_ADDR(bus, devfn, where) \
49 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
50 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
52 #define PCIE_CONF_DATA_OFF 0x18fc
53 #define PCIE_MASK_OFF 0x1910
54 #define PCIE_MASK_ENABLE_INTS 0x0f000000
55 #define PCIE_CTRL_OFF 0x1a00
56 #define PCIE_CTRL_X1_MODE 0x0001
57 #define PCIE_STAT_OFF 0x1a04
58 #define PCIE_STAT_BUS 0xff00
59 #define PCIE_STAT_DEV 0x1f0000
60 #define PCIE_STAT_LINK_DOWN BIT(0)
61 #define PCIE_RC_RTSTA 0x1a14
62 #define PCIE_DEBUG_CTRL 0x1a60
63 #define PCIE_DEBUG_SOFT_RESET BIT(20)
66 PCISWCAP = PCI_BRIDGE_CONTROL + 2,
67 PCISWCAP_EXP_LIST_ID = PCISWCAP + PCI_CAP_LIST_ID,
68 PCISWCAP_EXP_DEVCAP = PCISWCAP + PCI_EXP_DEVCAP,
69 PCISWCAP_EXP_DEVCTL = PCISWCAP + PCI_EXP_DEVCTL,
70 PCISWCAP_EXP_LNKCAP = PCISWCAP + PCI_EXP_LNKCAP,
71 PCISWCAP_EXP_LNKCTL = PCISWCAP + PCI_EXP_LNKCTL,
72 PCISWCAP_EXP_SLTCAP = PCISWCAP + PCI_EXP_SLTCAP,
73 PCISWCAP_EXP_SLTCTL = PCISWCAP + PCI_EXP_SLTCTL,
74 PCISWCAP_EXP_RTCTL = PCISWCAP + PCI_EXP_RTCTL,
75 PCISWCAP_EXP_RTSTA = PCISWCAP + PCI_EXP_RTSTA,
76 PCISWCAP_EXP_DEVCAP2 = PCISWCAP + PCI_EXP_DEVCAP2,
77 PCISWCAP_EXP_DEVCTL2 = PCISWCAP + PCI_EXP_DEVCTL2,
78 PCISWCAP_EXP_LNKCAP2 = PCISWCAP + PCI_EXP_LNKCAP2,
79 PCISWCAP_EXP_LNKCTL2 = PCISWCAP + PCI_EXP_LNKCTL2,
80 PCISWCAP_EXP_SLTCAP2 = PCISWCAP + PCI_EXP_SLTCAP2,
81 PCISWCAP_EXP_SLTCTL2 = PCISWCAP + PCI_EXP_SLTCTL2,
84 /* PCI configuration space of a PCI-to-PCI bridge */
85 struct mvebu_sw_pci_bridge {
101 u8 secondary_latency_timer;
104 u16 secondary_status;
114 /* PCI express capability */
120 struct mvebu_pcie_port;
122 /* Structure representing all PCIe interfaces */
124 struct platform_device *pdev;
125 struct mvebu_pcie_port *ports;
126 struct msi_controller *msi;
128 struct resource realio;
130 struct resource busn;
134 /* Structure representing one PCIe interface */
135 struct mvebu_pcie_port {
141 unsigned int mem_target;
142 unsigned int mem_attr;
143 unsigned int io_target;
144 unsigned int io_attr;
146 struct gpio_desc *reset_gpio;
148 struct mvebu_sw_pci_bridge bridge;
149 struct device_node *dn;
150 struct mvebu_pcie *pcie;
151 phys_addr_t memwin_base;
153 phys_addr_t iowin_base;
158 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
160 writel(val, port->base + reg);
163 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
165 return readl(port->base + reg);
168 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
170 return port->io_target != -1 && port->io_attr != -1;
173 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
175 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
178 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
182 stat = mvebu_readl(port, PCIE_STAT_OFF);
183 stat &= ~PCIE_STAT_BUS;
185 mvebu_writel(port, stat, PCIE_STAT_OFF);
188 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
192 stat = mvebu_readl(port, PCIE_STAT_OFF);
193 stat &= ~PCIE_STAT_DEV;
195 mvebu_writel(port, stat, PCIE_STAT_OFF);
199 * Setup PCIE BARs and Address Decode Wins:
200 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
201 * WIN[0-3] -> DRAM bank[0-3]
203 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
205 const struct mbus_dram_target_info *dram;
209 dram = mv_mbus_dram_info();
211 /* First, disable and clear BARs and windows. */
212 for (i = 1; i < 3; i++) {
213 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
214 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
215 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
218 for (i = 0; i < 5; i++) {
219 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
220 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
221 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
224 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
225 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
226 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
228 /* Setup windows for DDR banks. Count total DDR size on the fly. */
230 for (i = 0; i < dram->num_cs; i++) {
231 const struct mbus_dram_window *cs = dram->cs + i;
233 mvebu_writel(port, cs->base & 0xffff0000,
234 PCIE_WIN04_BASE_OFF(i));
235 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
237 ((cs->size - 1) & 0xffff0000) |
238 (cs->mbus_attr << 8) |
239 (dram->mbus_dram_target_id << 4) | 1,
240 PCIE_WIN04_CTRL_OFF(i));
245 /* Round up 'size' to the nearest power of two. */
246 if ((size & (size - 1)) != 0)
247 size = 1 << fls(size);
249 /* Setup BAR[1] to all DRAM banks. */
250 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
251 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
252 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
253 PCIE_BAR_CTRL_OFF(1));
256 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
260 /* Point PCIe unit MBUS decode windows to DRAM space. */
261 mvebu_pcie_setup_wins(port);
263 /* Master + slave enable. */
264 cmd = mvebu_readl(port, PCIE_CMD_OFF);
265 cmd |= PCI_COMMAND_IO;
266 cmd |= PCI_COMMAND_MEMORY;
267 cmd |= PCI_COMMAND_MASTER;
268 mvebu_writel(port, cmd, PCIE_CMD_OFF);
270 /* Enable interrupt lines A-D. */
271 mask = mvebu_readl(port, PCIE_MASK_OFF);
272 mask |= PCIE_MASK_ENABLE_INTS;
273 mvebu_writel(port, mask, PCIE_MASK_OFF);
276 static int mvebu_pcie_hw_rd_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 *val = readb_relaxed(conf_data + (where & 3));
290 *val = readw_relaxed(conf_data + (where & 2));
293 *val = readl_relaxed(conf_data);
297 return PCIBIOS_SUCCESSFUL;
300 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
302 u32 devfn, int where, int size, u32 val)
304 void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
306 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
311 writeb(val, conf_data + (where & 3));
314 writew(val, conf_data + (where & 2));
317 writel(val, conf_data);
320 return PCIBIOS_BAD_REGISTER_NUMBER;
323 return PCIBIOS_SUCCESSFUL;
327 * Remove windows, starting from the largest ones to the smallest
330 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
331 phys_addr_t base, size_t size)
334 size_t sz = 1 << (fls(size) - 1);
336 mvebu_mbus_del_window(base, sz);
343 * MBus windows can only have a power of two size, but PCI BARs do not
344 * have this constraint. Therefore, we have to split the PCI BAR into
345 * areas each having a power of two size. We start from the largest
346 * one (i.e highest order bit set in the size).
348 static void mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
349 unsigned int target, unsigned int attribute,
350 phys_addr_t base, size_t size,
353 size_t size_mapped = 0;
356 size_t sz = 1 << (fls(size) - 1);
359 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
362 phys_addr_t end = base + sz - 1;
364 dev_err(&port->pcie->pdev->dev,
365 "Could not create MBus window at [mem %pa-%pa]: %d\n",
367 mvebu_pcie_del_windows(port, base - size_mapped,
375 if (remap != MVEBU_MBUS_NO_REMAP)
380 static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
384 /* Are the new iobase/iolimit values invalid? */
385 if (port->bridge.iolimit < port->bridge.iobase ||
386 port->bridge.iolimitupper < port->bridge.iobaseupper ||
387 !(port->bridge.command & PCI_COMMAND_IO)) {
389 /* If a window was configured, remove it */
390 if (port->iowin_base) {
391 mvebu_pcie_del_windows(port, port->iowin_base,
393 port->iowin_base = 0;
394 port->iowin_size = 0;
400 if (dev_WARN(&port->pcie->pdev->dev, !mvebu_has_ioport(port),
401 "Attempt to set IO when IO is disabled\n"))
405 * We read the PCI-to-PCI bridge emulated registers, and
406 * calculate the base address and size of the address decoding
407 * window to setup, according to the PCI-to-PCI bridge
408 * specifications. iobase is the bus address, port->iowin_base
409 * is the CPU address.
411 iobase = ((port->bridge.iobase & 0xF0) << 8) |
412 (port->bridge.iobaseupper << 16);
413 port->iowin_base = port->pcie->io.start + iobase;
414 port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
415 (port->bridge.iolimitupper << 16)) -
418 mvebu_pcie_add_windows(port, port->io_target, port->io_attr,
419 port->iowin_base, port->iowin_size,
423 static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
425 /* Are the new membase/memlimit values invalid? */
426 if (port->bridge.memlimit < port->bridge.membase ||
427 !(port->bridge.command & PCI_COMMAND_MEMORY)) {
429 /* If a window was configured, remove it */
430 if (port->memwin_base) {
431 mvebu_pcie_del_windows(port, port->memwin_base,
433 port->memwin_base = 0;
434 port->memwin_size = 0;
441 * We read the PCI-to-PCI bridge emulated registers, and
442 * calculate the base address and size of the address decoding
443 * window to setup, according to the PCI-to-PCI bridge
446 port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16);
448 (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
449 port->memwin_base + 1;
451 mvebu_pcie_add_windows(port, port->mem_target, port->mem_attr,
452 port->memwin_base, port->memwin_size,
453 MVEBU_MBUS_NO_REMAP);
457 * Initialize the configuration space of the PCI-to-PCI bridge
458 * associated with the given PCIe interface.
460 static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
462 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
464 memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
466 bridge->class = PCI_CLASS_BRIDGE_PCI;
467 bridge->vendor = PCI_VENDOR_ID_MARVELL;
468 bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
469 bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
470 bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
471 bridge->cache_line_size = 0x10;
473 /* We support 32 bits I/O addressing */
474 bridge->iobase = PCI_IO_RANGE_TYPE_32;
475 bridge->iolimit = PCI_IO_RANGE_TYPE_32;
477 /* Add capabilities */
478 bridge->status = PCI_STATUS_CAP_LIST;
482 * Read the configuration space of the PCI-to-PCI bridge associated to
483 * the given PCIe interface.
485 static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
486 unsigned int where, int size, u32 *value)
488 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
490 switch (where & ~3) {
492 *value = bridge->device << 16 | bridge->vendor;
496 *value = bridge->command | bridge->status << 16;
499 case PCI_CLASS_REVISION:
500 *value = bridge->class << 16 | bridge->interface << 8 |
504 case PCI_CACHE_LINE_SIZE:
505 *value = bridge->bist << 24 | bridge->header_type << 16 |
506 bridge->latency_timer << 8 | bridge->cache_line_size;
509 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
510 *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
513 case PCI_PRIMARY_BUS:
514 *value = (bridge->secondary_latency_timer << 24 |
515 bridge->subordinate_bus << 16 |
516 bridge->secondary_bus << 8 |
517 bridge->primary_bus);
521 if (!mvebu_has_ioport(port))
522 *value = bridge->secondary_status << 16;
524 *value = (bridge->secondary_status << 16 |
525 bridge->iolimit << 8 |
529 case PCI_MEMORY_BASE:
530 *value = (bridge->memlimit << 16 | bridge->membase);
533 case PCI_PREF_MEMORY_BASE:
537 case PCI_IO_BASE_UPPER16:
538 *value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
541 case PCI_CAPABILITY_LIST:
545 case PCI_ROM_ADDRESS1:
549 case PCI_INTERRUPT_LINE:
550 /* LINE PIN MIN_GNT MAX_LAT */
554 case PCISWCAP_EXP_LIST_ID:
555 /* Set PCIe v2, root port, slot support */
556 *value = (PCI_EXP_TYPE_ROOT_PORT << 4 | 2 |
557 PCI_EXP_FLAGS_SLOT) << 16 | PCI_CAP_ID_EXP;
560 case PCISWCAP_EXP_DEVCAP:
561 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP);
564 case PCISWCAP_EXP_DEVCTL:
565 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL) &
566 ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
567 PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
568 *value |= bridge->pcie_devctl;
571 case PCISWCAP_EXP_LNKCAP:
573 * PCIe requires the clock power management capability to be
574 * hard-wired to zero for downstream ports
576 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
577 ~PCI_EXP_LNKCAP_CLKPM;
580 case PCISWCAP_EXP_LNKCTL:
581 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
584 case PCISWCAP_EXP_SLTCAP:
585 *value = bridge->pcie_sltcap;
588 case PCISWCAP_EXP_SLTCTL:
589 *value = PCI_EXP_SLTSTA_PDS << 16;
592 case PCISWCAP_EXP_RTCTL:
593 *value = bridge->pcie_rtctl;
596 case PCISWCAP_EXP_RTSTA:
597 *value = mvebu_readl(port, PCIE_RC_RTSTA);
600 /* PCIe requires the v2 fields to be hard-wired to zero */
601 case PCISWCAP_EXP_DEVCAP2:
602 case PCISWCAP_EXP_DEVCTL2:
603 case PCISWCAP_EXP_LNKCAP2:
604 case PCISWCAP_EXP_LNKCTL2:
605 case PCISWCAP_EXP_SLTCAP2:
606 case PCISWCAP_EXP_SLTCTL2:
609 * PCI defines configuration read accesses to reserved or
610 * unimplemented registers to read as zero and complete
614 return PCIBIOS_SUCCESSFUL;
618 *value = (*value >> (8 * (where & 3))) & 0xffff;
620 *value = (*value >> (8 * (where & 3))) & 0xff;
622 return PCIBIOS_SUCCESSFUL;
625 /* Write to the PCI-to-PCI bridge configuration space */
626 static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
627 unsigned int where, int size, u32 value)
629 struct mvebu_sw_pci_bridge *bridge = &port->bridge;
636 mask = ~(0xffff << ((where & 3) * 8));
638 mask = ~(0xff << ((where & 3) * 8));
640 return PCIBIOS_BAD_REGISTER_NUMBER;
642 err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®);
646 value = (reg & mask) | value << ((where & 3) * 8);
648 switch (where & ~3) {
651 u32 old = bridge->command;
653 if (!mvebu_has_ioport(port))
654 value &= ~PCI_COMMAND_IO;
656 bridge->command = value & 0xffff;
657 if ((old ^ bridge->command) & PCI_COMMAND_IO)
658 mvebu_pcie_handle_iobase_change(port);
659 if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
660 mvebu_pcie_handle_membase_change(port);
664 case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
665 bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
670 * We also keep bit 1 set, it is a read-only bit that
671 * indicates we support 32 bits addressing for the
674 bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
675 bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
676 mvebu_pcie_handle_iobase_change(port);
679 case PCI_MEMORY_BASE:
680 bridge->membase = value & 0xffff;
681 bridge->memlimit = value >> 16;
682 mvebu_pcie_handle_membase_change(port);
685 case PCI_IO_BASE_UPPER16:
686 bridge->iobaseupper = value & 0xffff;
687 bridge->iolimitupper = value >> 16;
688 mvebu_pcie_handle_iobase_change(port);
691 case PCI_PRIMARY_BUS:
692 bridge->primary_bus = value & 0xff;
693 bridge->secondary_bus = (value >> 8) & 0xff;
694 bridge->subordinate_bus = (value >> 16) & 0xff;
695 bridge->secondary_latency_timer = (value >> 24) & 0xff;
696 mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
699 case PCISWCAP_EXP_DEVCTL:
701 * Armada370 data says these bits must always
702 * be zero when in root complex mode.
704 value &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
705 PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
708 * If the mask is 0xffff0000, then we only want to write
709 * the device control register, rather than clearing the
710 * RW1C bits in the device status register. Mask out the
711 * status register bits.
713 if (mask == 0xffff0000)
716 mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
719 case PCISWCAP_EXP_LNKCTL:
721 * If we don't support CLKREQ, we must ensure that the
722 * CLKREQ enable bit always reads zero. Since we haven't
723 * had this capability, and it's dependent on board wiring,
724 * disable it for the time being.
726 value &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
729 * If the mask is 0xffff0000, then we only want to write
730 * the link control register, rather than clearing the
731 * RW1C bits in the link status register. Mask out the
732 * status register bits.
734 if (mask == 0xffff0000)
737 mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
740 case PCISWCAP_EXP_RTSTA:
741 mvebu_writel(port, value, PCIE_RC_RTSTA);
748 return PCIBIOS_SUCCESSFUL;
751 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
753 return sys->private_data;
756 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
762 for (i = 0; i < pcie->nports; i++) {
763 struct mvebu_pcie_port *port = &pcie->ports[i];
765 if (bus->number == 0 && port->devfn == devfn)
767 if (bus->number != 0 &&
768 bus->number >= port->bridge.secondary_bus &&
769 bus->number <= port->bridge.subordinate_bus)
776 /* PCI configuration space write function */
777 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
778 int where, int size, u32 val)
780 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
781 struct mvebu_pcie_port *port;
784 port = mvebu_pcie_find_port(pcie, bus, devfn);
786 return PCIBIOS_DEVICE_NOT_FOUND;
788 /* Access the emulated PCI-to-PCI bridge */
789 if (bus->number == 0)
790 return mvebu_sw_pci_bridge_write(port, where, size, val);
792 if (!mvebu_pcie_link_up(port))
793 return PCIBIOS_DEVICE_NOT_FOUND;
795 /* Access the real PCIe interface */
796 ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
802 /* PCI configuration space read function */
803 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
806 struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);
807 struct mvebu_pcie_port *port;
810 port = mvebu_pcie_find_port(pcie, bus, devfn);
813 return PCIBIOS_DEVICE_NOT_FOUND;
816 /* Access the emulated PCI-to-PCI bridge */
817 if (bus->number == 0)
818 return mvebu_sw_pci_bridge_read(port, where, size, val);
820 if (!mvebu_pcie_link_up(port)) {
822 return PCIBIOS_DEVICE_NOT_FOUND;
825 /* Access the real PCIe interface */
826 ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
832 static struct pci_ops mvebu_pcie_ops = {
833 .read = mvebu_pcie_rd_conf,
834 .write = mvebu_pcie_wr_conf,
837 static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
839 struct mvebu_pcie *pcie = sys_to_pcie(sys);
842 pcie->mem.name = "PCI MEM";
843 pcie->realio.name = "PCI I/O";
845 if (request_resource(&iomem_resource, &pcie->mem))
848 if (resource_size(&pcie->realio) != 0) {
849 if (request_resource(&ioport_resource, &pcie->realio)) {
850 release_resource(&pcie->mem);
853 pci_add_resource_offset(&sys->resources, &pcie->realio,
856 pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
857 pci_add_resource(&sys->resources, &pcie->busn);
859 for (i = 0; i < pcie->nports; i++) {
860 struct mvebu_pcie_port *port = &pcie->ports[i];
864 mvebu_pcie_setup_hw(port);
870 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
871 const struct resource *res,
872 resource_size_t start,
873 resource_size_t size,
874 resource_size_t align)
876 if (dev->bus->number != 0)
880 * On the PCI-to-PCI bridge side, the I/O windows must have at
881 * least a 64 KB size and the memory windows must have at
882 * least a 1 MB size. Moreover, MBus windows need to have a
883 * base address aligned on their size, and their size must be
884 * a power of two. This means that if the BAR doesn't have a
885 * power of two size, several MBus windows will actually be
886 * created. We need to ensure that the biggest MBus window
887 * (which will be the first one) is aligned on its size, which
888 * explains the rounddown_pow_of_two() being done here.
890 if (res->flags & IORESOURCE_IO)
891 return round_up(start, max_t(resource_size_t, SZ_64K,
892 rounddown_pow_of_two(size)));
893 else if (res->flags & IORESOURCE_MEM)
894 return round_up(start, max_t(resource_size_t, SZ_1M,
895 rounddown_pow_of_two(size)));
900 static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
904 memset(&hw, 0, sizeof(hw));
906 #ifdef CONFIG_PCI_MSI
907 hw.msi_ctrl = pcie->msi;
910 hw.nr_controllers = 1;
911 hw.private_data = (void **)&pcie;
912 hw.setup = mvebu_pcie_setup;
913 hw.map_irq = of_irq_parse_and_map_pci;
914 hw.ops = &mvebu_pcie_ops;
915 hw.align_resource = mvebu_pcie_align_resource;
917 pci_common_init_dev(&pcie->pdev->dev, &hw);
921 * Looks up the list of register addresses encoded into the reg =
922 * <...> property for one that matches the given port/lane. Once
925 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
926 struct device_node *np,
927 struct mvebu_pcie_port *port)
929 struct resource regs;
932 ret = of_address_to_resource(np, 0, ®s);
936 return devm_ioremap_resource(&pdev->dev, ®s);
939 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
940 #define DT_TYPE_IO 0x1
941 #define DT_TYPE_MEM32 0x2
942 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
943 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
945 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
950 const int na = 3, ns = 2;
952 int rlen, nranges, rangesz, pna, i;
957 range = of_get_property(np, "ranges", &rlen);
961 pna = of_n_addr_cells(np);
962 rangesz = pna + na + ns;
963 nranges = rlen / sizeof(__be32) / rangesz;
965 for (i = 0; i < nranges; i++, range += rangesz) {
966 u32 flags = of_read_number(range, 1);
967 u32 slot = of_read_number(range + 1, 1);
968 u64 cpuaddr = of_read_number(range + na, pna);
971 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
972 rtype = IORESOURCE_IO;
973 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
974 rtype = IORESOURCE_MEM;
978 if (slot == PCI_SLOT(devfn) && type == rtype) {
979 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
980 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
988 static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)
990 struct device_node *msi_node;
992 msi_node = of_parse_phandle(pcie->pdev->dev.of_node,
997 pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
998 of_node_put(msi_node);
1001 pcie->msi->dev = &pcie->pdev->dev;
1004 static int mvebu_pcie_suspend(struct device *dev)
1006 struct mvebu_pcie *pcie;
1009 pcie = dev_get_drvdata(dev);
1010 for (i = 0; i < pcie->nports; i++) {
1011 struct mvebu_pcie_port *port = pcie->ports + i;
1012 port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
1018 static int mvebu_pcie_resume(struct device *dev)
1020 struct mvebu_pcie *pcie;
1023 pcie = dev_get_drvdata(dev);
1024 for (i = 0; i < pcie->nports; i++) {
1025 struct mvebu_pcie_port *port = pcie->ports + i;
1026 mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
1027 mvebu_pcie_setup_hw(port);
1033 static void mvebu_pcie_port_clk_put(void *data)
1035 struct mvebu_pcie_port *port = data;
1040 static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
1041 struct mvebu_pcie_port *port, struct device_node *child)
1043 struct device *dev = &pcie->pdev->dev;
1044 enum of_gpio_flags flags;
1045 int reset_gpio, ret;
1049 if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) {
1050 dev_warn(dev, "ignoring %s, missing pcie-port property\n",
1051 of_node_full_name(child));
1055 if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane))
1058 port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port,
1065 port->devfn = of_pci_get_devfn(child);
1066 if (port->devfn < 0)
1069 ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
1070 &port->mem_target, &port->mem_attr);
1072 dev_err(dev, "%s: cannot get tgt/attr for mem window\n",
1077 if (resource_size(&pcie->io) != 0) {
1078 mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO,
1079 &port->io_target, &port->io_attr);
1081 port->io_target = -1;
1085 reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags);
1086 if (reset_gpio == -EPROBE_DEFER) {
1091 if (gpio_is_valid(reset_gpio)) {
1092 unsigned long gpio_flags;
1094 port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset",
1096 if (!port->reset_name) {
1101 if (flags & OF_GPIO_ACTIVE_LOW) {
1102 dev_info(dev, "%s: reset gpio is active low\n",
1103 of_node_full_name(child));
1104 gpio_flags = GPIOF_ACTIVE_LOW |
1107 gpio_flags = GPIOF_OUT_INIT_HIGH;
1110 ret = devm_gpio_request_one(dev, reset_gpio, gpio_flags,
1113 if (ret == -EPROBE_DEFER)
1118 port->reset_gpio = gpio_to_desc(reset_gpio);
1121 port->clk = of_clk_get_by_name(child, NULL);
1122 if (IS_ERR(port->clk)) {
1123 dev_err(dev, "%s: cannot get clock\n", port->name);
1127 ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
1138 /* In the case of skipping, we need to free these */
1139 devm_kfree(dev, port->reset_name);
1140 port->reset_name = NULL;
1141 devm_kfree(dev, port->name);
1149 * Power up a PCIe port. PCIe requires the refclk to be stable for 100µs
1150 * prior to releasing PERST. See table 2-4 in section 2.6.2 AC Specifications
1151 * of the PCI Express Card Electromechanical Specification, 1.1.
1153 static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
1157 ret = clk_prepare_enable(port->clk);
1161 if (port->reset_gpio) {
1162 u32 reset_udelay = 20000;
1164 of_property_read_u32(port->dn, "reset-delay-us",
1169 gpiod_set_value_cansleep(port->reset_gpio, 0);
1170 msleep(reset_udelay / 1000);
1177 * Power down a PCIe port. Strictly, PCIe requires us to place the card
1178 * in D3hot state before asserting PERST#.
1180 static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
1182 if (port->reset_gpio)
1183 gpiod_set_value_cansleep(port->reset_gpio, 1);
1185 clk_disable_unprepare(port->clk);
1188 static int mvebu_pcie_probe(struct platform_device *pdev)
1190 struct mvebu_pcie *pcie;
1191 struct device_node *np = pdev->dev.of_node;
1192 struct device_node *child;
1195 pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie),
1201 platform_set_drvdata(pdev, pcie);
1203 /* Get the PCIe memory and I/O aperture */
1204 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
1205 if (resource_size(&pcie->mem) == 0) {
1206 dev_err(&pdev->dev, "invalid memory aperture size\n");
1210 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
1212 if (resource_size(&pcie->io) != 0) {
1213 pcie->realio.flags = pcie->io.flags;
1214 pcie->realio.start = PCIBIOS_MIN_IO;
1215 pcie->realio.end = min_t(resource_size_t,
1217 resource_size(&pcie->io));
1219 pcie->realio = pcie->io;
1221 /* Get the bus range */
1222 ret = of_pci_parse_bus_range(np, &pcie->busn);
1224 dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
1229 num = of_get_available_child_count(pdev->dev.of_node);
1231 pcie->ports = devm_kcalloc(&pdev->dev, num, sizeof(*pcie->ports),
1237 for_each_available_child_of_node(pdev->dev.of_node, child) {
1238 struct mvebu_pcie_port *port = &pcie->ports[i];
1240 ret = mvebu_pcie_parse_port(pcie, port, child);
1244 } else if (ret == 0) {
1253 for (i = 0; i < pcie->nports; i++) {
1254 struct mvebu_pcie_port *port = &pcie->ports[i];
1260 ret = mvebu_pcie_powerup(port);
1264 port->base = mvebu_pcie_map_registers(pdev, child, port);
1265 if (IS_ERR(port->base)) {
1266 dev_err(&pdev->dev, "%s: cannot map registers\n",
1269 mvebu_pcie_powerdown(port);
1273 mvebu_pcie_set_local_dev_nr(port, 1);
1274 mvebu_sw_pci_bridge_init(port);
1279 for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
1280 pci_ioremap_io(i, pcie->io.start + i);
1282 mvebu_pcie_msi_enable(pcie);
1283 mvebu_pcie_enable(pcie);
1285 platform_set_drvdata(pdev, pcie);
1290 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1291 { .compatible = "marvell,armada-xp-pcie", },
1292 { .compatible = "marvell,armada-370-pcie", },
1293 { .compatible = "marvell,dove-pcie", },
1294 { .compatible = "marvell,kirkwood-pcie", },
1297 MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
1299 static struct dev_pm_ops mvebu_pcie_pm_ops = {
1300 .suspend_noirq = mvebu_pcie_suspend,
1301 .resume_noirq = mvebu_pcie_resume,
1304 static struct platform_driver mvebu_pcie_driver = {
1306 .name = "mvebu-pcie",
1307 .of_match_table = mvebu_pcie_of_match_table,
1308 /* driver unloading/unbinding currently not supported */
1309 .suppress_bind_attrs = true,
1310 .pm = &mvebu_pcie_pm_ops,
1312 .probe = mvebu_pcie_probe,
1314 module_platform_driver(mvebu_pcie_driver);
1316 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
1317 MODULE_DESCRIPTION("Marvell EBU PCIe driver");
1318 MODULE_LICENSE("GPL v2");