1 // SPDX-License-Identifier: GPL-2.0
3 * PCIe driver for Marvell Armada 370 and Armada XP SoCs
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/bitfield.h>
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/gpio.h>
15 #include <linux/init.h>
16 #include <linux/mbus.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 #include "../pci-bridge-emul.h"
29 * PCIe unit register offsets.
31 #define PCIE_DEV_ID_OFF 0x0000
32 #define PCIE_CMD_OFF 0x0004
33 #define PCIE_DEV_REV_OFF 0x0008
34 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
35 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
36 #define PCIE_SSDEV_ID_OFF 0x002c
37 #define PCIE_CAP_PCIEXP 0x0060
38 #define PCIE_CAP_PCIERR_OFF 0x0100
39 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4))
40 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
41 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
42 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
43 #define PCIE_WIN5_CTRL_OFF 0x1880
44 #define PCIE_WIN5_BASE_OFF 0x1884
45 #define PCIE_WIN5_REMAP_OFF 0x188c
46 #define PCIE_CONF_ADDR_OFF 0x18f8
47 #define PCIE_CONF_ADDR_EN 0x80000000
48 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
49 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
50 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
51 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
52 #define PCIE_CONF_ADDR(bus, devfn, where) \
53 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
54 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \
56 #define PCIE_CONF_DATA_OFF 0x18fc
57 #define PCIE_INT_CAUSE_OFF 0x1900
58 #define PCIE_INT_UNMASK_OFF 0x1910
59 #define PCIE_INT_INTX(i) BIT(24+i)
60 #define PCIE_INT_PM_PME BIT(28)
61 #define PCIE_INT_ALL_MASK GENMASK(31, 0)
62 #define PCIE_CTRL_OFF 0x1a00
63 #define PCIE_CTRL_X1_MODE 0x0001
64 #define PCIE_CTRL_RC_MODE BIT(1)
65 #define PCIE_CTRL_MASTER_HOT_RESET BIT(24)
66 #define PCIE_STAT_OFF 0x1a04
67 #define PCIE_STAT_BUS 0xff00
68 #define PCIE_STAT_DEV 0x1f0000
69 #define PCIE_STAT_LINK_DOWN BIT(0)
70 #define PCIE_SSPL_OFF 0x1a0c
71 #define PCIE_SSPL_VALUE_SHIFT 0
72 #define PCIE_SSPL_VALUE_MASK GENMASK(7, 0)
73 #define PCIE_SSPL_SCALE_SHIFT 8
74 #define PCIE_SSPL_SCALE_MASK GENMASK(9, 8)
75 #define PCIE_SSPL_ENABLE BIT(16)
76 #define PCIE_RC_RTSTA 0x1a14
77 #define PCIE_DEBUG_CTRL 0x1a60
78 #define PCIE_DEBUG_SOFT_RESET BIT(20)
80 struct mvebu_pcie_port;
82 /* Structure representing all PCIe interfaces */
84 struct platform_device *pdev;
85 struct mvebu_pcie_port *ports;
87 struct resource realio;
93 struct mvebu_pcie_window {
99 /* Structure representing one PCIe interface */
100 struct mvebu_pcie_port {
107 unsigned int mem_target;
108 unsigned int mem_attr;
109 unsigned int io_target;
110 unsigned int io_attr;
112 struct gpio_desc *reset_gpio;
114 struct pci_bridge_emul bridge;
115 struct device_node *dn;
116 struct mvebu_pcie *pcie;
117 struct mvebu_pcie_window memwin;
118 struct mvebu_pcie_window iowin;
120 struct resource regs;
121 u8 slot_power_limit_value;
122 u8 slot_power_limit_scale;
123 struct irq_domain *intx_irq_domain;
124 raw_spinlock_t irq_lock;
128 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
130 writel(val, port->base + reg);
133 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg)
135 return readl(port->base + reg);
138 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port)
140 return port->io_target != -1 && port->io_attr != -1;
143 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port)
145 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
148 static u8 mvebu_pcie_get_local_bus_nr(struct mvebu_pcie_port *port)
150 return (mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_BUS) >> 8;
153 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr)
157 stat = mvebu_readl(port, PCIE_STAT_OFF);
158 stat &= ~PCIE_STAT_BUS;
160 mvebu_writel(port, stat, PCIE_STAT_OFF);
163 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
167 stat = mvebu_readl(port, PCIE_STAT_OFF);
168 stat &= ~PCIE_STAT_DEV;
170 mvebu_writel(port, stat, PCIE_STAT_OFF);
173 static void mvebu_pcie_disable_wins(struct mvebu_pcie_port *port)
177 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(0));
178 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0));
180 for (i = 1; i < 3; i++) {
181 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i));
182 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i));
183 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i));
186 for (i = 0; i < 5; i++) {
187 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i));
188 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i));
189 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
192 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF);
193 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF);
194 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF);
198 * Setup PCIE BARs and Address Decode Wins:
199 * BAR[0] -> internal registers (needed for MSI)
200 * BAR[1] -> covers all DRAM banks
202 * WIN[0-3] -> DRAM bank[0-3]
204 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
206 const struct mbus_dram_target_info *dram;
210 dram = mv_mbus_dram_info();
212 /* First, disable and clear BARs and windows. */
213 mvebu_pcie_disable_wins(port);
215 /* Setup windows for DDR banks. Count total DDR size on the fly. */
217 for (i = 0; i < dram->num_cs; i++) {
218 const struct mbus_dram_window *cs = dram->cs + i;
220 mvebu_writel(port, cs->base & 0xffff0000,
221 PCIE_WIN04_BASE_OFF(i));
222 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i));
224 ((cs->size - 1) & 0xffff0000) |
225 (cs->mbus_attr << 8) |
226 (dram->mbus_dram_target_id << 4) | 1,
227 PCIE_WIN04_CTRL_OFF(i));
232 /* Round up 'size' to the nearest power of two. */
233 if ((size & (size - 1)) != 0)
234 size = 1 << fls(size);
236 /* Setup BAR[1] to all DRAM banks. */
237 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
238 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
239 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
240 PCIE_BAR_CTRL_OFF(1));
243 * Point BAR[0] to the device's internal registers.
245 mvebu_writel(port, round_down(port->regs.start, SZ_1M), PCIE_BAR_LO_OFF(0));
246 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0));
249 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
251 u32 ctrl, lnkcap, cmd, dev_rev, unmask, sspl;
253 /* Setup PCIe controller to Root Complex mode. */
254 ctrl = mvebu_readl(port, PCIE_CTRL_OFF);
255 ctrl |= PCIE_CTRL_RC_MODE;
256 mvebu_writel(port, ctrl, PCIE_CTRL_OFF);
259 * Set Maximum Link Width to X1 or X4 in Root Port's PCIe Link
260 * Capability register. This register is defined by PCIe specification
261 * as read-only but this mvebu controller has it as read-write and must
262 * be set to number of SerDes PCIe lanes (1 or 4). If this register is
263 * not set correctly then link with endpoint card is not established.
265 lnkcap = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP);
266 lnkcap &= ~PCI_EXP_LNKCAP_MLW;
267 lnkcap |= (port->is_x4 ? 4 : 1) << 4;
268 mvebu_writel(port, lnkcap, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP);
270 /* Disable Root Bridge I/O space, memory space and bus mastering. */
271 cmd = mvebu_readl(port, PCIE_CMD_OFF);
272 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
273 mvebu_writel(port, cmd, PCIE_CMD_OFF);
276 * Change Class Code of PCI Bridge device to PCI Bridge (0x6004)
277 * because default value is Memory controller (0x5080).
279 * Note that this mvebu PCI Bridge does not have compliant Type 1
280 * Configuration Space. Header Type is reported as Type 0 and it
281 * has format of Type 0 config space.
283 * Moreover Type 0 BAR registers (ranges 0x10 - 0x28 and 0x30 - 0x34)
284 * have the same format in Marvell's specification as in PCIe
285 * specification, but their meaning is totally different and they do
286 * different things: they are aliased into internal mvebu registers
287 * (e.g. PCIE_BAR_LO_OFF) and these should not be changed or
288 * reconfigured by pci device drivers.
290 * Therefore driver uses emulation of PCI Bridge which emulates
291 * access to configuration space via internal mvebu registers or
292 * emulated configuration buffer. Driver access these PCI Bridge
293 * directly for simplification, but these registers can be accessed
294 * also via standard mvebu way for accessing PCI config space.
296 dev_rev = mvebu_readl(port, PCIE_DEV_REV_OFF);
297 dev_rev &= ~0xffffff00;
298 dev_rev |= PCI_CLASS_BRIDGE_PCI_NORMAL << 8;
299 mvebu_writel(port, dev_rev, PCIE_DEV_REV_OFF);
301 /* Point PCIe unit MBUS decode windows to DRAM space. */
302 mvebu_pcie_setup_wins(port);
305 * Program Root Port to automatically send Set_Slot_Power_Limit
306 * PCIe Message when changing status from Dl_Down to Dl_Up and valid
307 * slot power limit was specified.
309 sspl = mvebu_readl(port, PCIE_SSPL_OFF);
310 sspl &= ~(PCIE_SSPL_VALUE_MASK | PCIE_SSPL_SCALE_MASK | PCIE_SSPL_ENABLE);
311 if (port->slot_power_limit_value) {
312 sspl |= port->slot_power_limit_value << PCIE_SSPL_VALUE_SHIFT;
313 sspl |= port->slot_power_limit_scale << PCIE_SSPL_SCALE_SHIFT;
314 sspl |= PCIE_SSPL_ENABLE;
316 mvebu_writel(port, sspl, PCIE_SSPL_OFF);
318 /* Mask all interrupt sources. */
319 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_UNMASK_OFF);
321 /* Clear all interrupt causes. */
322 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF);
324 /* Check if "intx" interrupt was specified in DT. */
325 if (port->intx_irq > 0)
329 * Fallback code when "intx" interrupt was not specified in DT:
330 * Unmask all legacy INTx interrupts as driver does not provide a way
331 * for masking and unmasking of individual legacy INTx interrupts.
332 * Legacy INTx are reported via one shared GIC source and therefore
333 * kernel cannot distinguish which individual legacy INTx was triggered.
334 * These interrupts are shared, so it should not cause any issue. Just
335 * performance penalty as every PCIe interrupt handler needs to be
336 * called when some interrupt is triggered.
338 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF);
339 unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) |
340 PCIE_INT_INTX(2) | PCIE_INT_INTX(3);
341 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF);
344 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
348 static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
351 struct mvebu_pcie *pcie = bus->sysdata;
352 struct mvebu_pcie_port *port;
353 void __iomem *conf_data;
355 port = mvebu_pcie_find_port(pcie, bus, devfn);
357 return PCIBIOS_DEVICE_NOT_FOUND;
359 if (!mvebu_pcie_link_up(port))
360 return PCIBIOS_DEVICE_NOT_FOUND;
362 conf_data = port->base + PCIE_CONF_DATA_OFF;
364 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
369 *val = readb_relaxed(conf_data + (where & 3));
372 *val = readw_relaxed(conf_data + (where & 2));
375 *val = readl_relaxed(conf_data);
378 return PCIBIOS_BAD_REGISTER_NUMBER;
381 return PCIBIOS_SUCCESSFUL;
384 static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
385 int where, int size, u32 val)
387 struct mvebu_pcie *pcie = bus->sysdata;
388 struct mvebu_pcie_port *port;
389 void __iomem *conf_data;
391 port = mvebu_pcie_find_port(pcie, bus, devfn);
393 return PCIBIOS_DEVICE_NOT_FOUND;
395 if (!mvebu_pcie_link_up(port))
396 return PCIBIOS_DEVICE_NOT_FOUND;
398 conf_data = port->base + PCIE_CONF_DATA_OFF;
400 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
405 writeb(val, conf_data + (where & 3));
408 writew(val, conf_data + (where & 2));
411 writel(val, conf_data);
414 return PCIBIOS_BAD_REGISTER_NUMBER;
417 return PCIBIOS_SUCCESSFUL;
420 static struct pci_ops mvebu_pcie_child_ops = {
421 .read = mvebu_pcie_child_rd_conf,
422 .write = mvebu_pcie_child_wr_conf,
426 * Remove windows, starting from the largest ones to the smallest
429 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port,
430 phys_addr_t base, size_t size)
433 size_t sz = 1 << (fls(size) - 1);
435 mvebu_mbus_del_window(base, sz);
442 * MBus windows can only have a power of two size, but PCI BARs do not
443 * have this constraint. Therefore, we have to split the PCI BAR into
444 * areas each having a power of two size. We start from the largest
445 * one (i.e highest order bit set in the size).
447 static int mvebu_pcie_add_windows(struct mvebu_pcie_port *port,
448 unsigned int target, unsigned int attribute,
449 phys_addr_t base, size_t size,
452 size_t size_mapped = 0;
455 size_t sz = 1 << (fls(size) - 1);
458 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
461 phys_addr_t end = base + sz - 1;
463 dev_err(&port->pcie->pdev->dev,
464 "Could not create MBus window at [mem %pa-%pa]: %d\n",
466 mvebu_pcie_del_windows(port, base - size_mapped,
474 if (remap != MVEBU_MBUS_NO_REMAP)
481 static int mvebu_pcie_set_window(struct mvebu_pcie_port *port,
482 unsigned int target, unsigned int attribute,
483 const struct mvebu_pcie_window *desired,
484 struct mvebu_pcie_window *cur)
488 if (desired->base == cur->base && desired->remap == cur->remap &&
489 desired->size == cur->size)
492 if (cur->size != 0) {
493 mvebu_pcie_del_windows(port, cur->base, cur->size);
498 * If something tries to change the window while it is enabled
499 * the change will not be done atomically. That would be
500 * difficult to do in the general case.
504 if (desired->size == 0)
507 ret = mvebu_pcie_add_windows(port, target, attribute, desired->base,
508 desired->size, desired->remap);
519 static int mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
521 struct mvebu_pcie_window desired = {};
522 struct pci_bridge_emul_conf *conf = &port->bridge.conf;
524 /* Are the new iobase/iolimit values invalid? */
525 if (conf->iolimit < conf->iobase ||
526 conf->iolimitupper < conf->iobaseupper)
527 return mvebu_pcie_set_window(port, port->io_target, port->io_attr,
528 &desired, &port->iowin);
531 * We read the PCI-to-PCI bridge emulated registers, and
532 * calculate the base address and size of the address decoding
533 * window to setup, according to the PCI-to-PCI bridge
534 * specifications. iobase is the bus address, port->iowin_base
535 * is the CPU address.
537 desired.remap = ((conf->iobase & 0xF0) << 8) |
538 (conf->iobaseupper << 16);
539 desired.base = port->pcie->io.start + desired.remap;
540 desired.size = ((0xFFF | ((conf->iolimit & 0xF0) << 8) |
541 (conf->iolimitupper << 16)) -
545 return mvebu_pcie_set_window(port, port->io_target, port->io_attr, &desired,
549 static int mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
551 struct mvebu_pcie_window desired = {.remap = MVEBU_MBUS_NO_REMAP};
552 struct pci_bridge_emul_conf *conf = &port->bridge.conf;
554 /* Are the new membase/memlimit values invalid? */
555 if (conf->memlimit < conf->membase)
556 return mvebu_pcie_set_window(port, port->mem_target, port->mem_attr,
557 &desired, &port->memwin);
560 * We read the PCI-to-PCI bridge emulated registers, and
561 * calculate the base address and size of the address decoding
562 * window to setup, according to the PCI-to-PCI bridge
565 desired.base = ((conf->membase & 0xFFF0) << 16);
566 desired.size = (((conf->memlimit & 0xFFF0) << 16) | 0xFFFFF) -
569 return mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, &desired,
573 static pci_bridge_emul_read_status_t
574 mvebu_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge,
577 struct mvebu_pcie_port *port = bridge->data;
581 *value = mvebu_readl(port, PCIE_CMD_OFF);
584 case PCI_PRIMARY_BUS: {
586 * From the whole 32bit register we support reading from HW only
587 * secondary bus number which is mvebu local bus number.
588 * Other bits are retrieved only from emulated config buffer.
590 __le32 *cfgspace = (__le32 *)&bridge->conf;
591 u32 val = le32_to_cpu(cfgspace[PCI_PRIMARY_BUS / 4]);
593 val |= mvebu_pcie_get_local_bus_nr(port) << 8;
598 case PCI_INTERRUPT_LINE: {
600 * From the whole 32bit register we support reading from HW only
601 * one bit: PCI_BRIDGE_CTL_BUS_RESET.
602 * Other bits are retrieved only from emulated config buffer.
604 __le32 *cfgspace = (__le32 *)&bridge->conf;
605 u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]);
606 if (mvebu_readl(port, PCIE_CTRL_OFF) & PCIE_CTRL_MASTER_HOT_RESET)
607 val |= PCI_BRIDGE_CTL_BUS_RESET << 16;
609 val &= ~(PCI_BRIDGE_CTL_BUS_RESET << 16);
615 return PCI_BRIDGE_EMUL_NOT_HANDLED;
618 return PCI_BRIDGE_EMUL_HANDLED;
621 static pci_bridge_emul_read_status_t
622 mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
625 struct mvebu_pcie_port *port = bridge->data;
629 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP);
633 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
638 * PCIe requires that the Clock Power Management capability bit
639 * is hard-wired to zero for downstream ports but HW returns 1.
640 * Additionally enable Data Link Layer Link Active Reporting
641 * Capable bit as DL_Active indication is provided too.
643 *value = (mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
644 ~PCI_EXP_LNKCAP_CLKPM) | PCI_EXP_LNKCAP_DLLLARC;
648 /* DL_Active indication is provided via PCIE_STAT_OFF */
649 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL) |
650 (mvebu_pcie_link_up(port) ?
651 (PCI_EXP_LNKSTA_DLLLA << 16) : 0);
654 case PCI_EXP_SLTCTL: {
655 u16 slotctl = le16_to_cpu(bridge->pcie_conf.slotctl);
656 u16 slotsta = le16_to_cpu(bridge->pcie_conf.slotsta);
659 * When slot power limit was not specified in DT then
660 * ASPL_DISABLE bit is stored only in emulated config space.
661 * Otherwise reflect status of PCIE_SSPL_ENABLE bit in HW.
663 if (!port->slot_power_limit_value)
664 val |= slotctl & PCI_EXP_SLTCTL_ASPL_DISABLE;
665 else if (!(mvebu_readl(port, PCIE_SSPL_OFF) & PCIE_SSPL_ENABLE))
666 val |= PCI_EXP_SLTCTL_ASPL_DISABLE;
667 /* This callback is 32-bit and in high bits is slot status. */
668 val |= slotsta << 16;
674 *value = mvebu_readl(port, PCIE_RC_RTSTA);
677 case PCI_EXP_DEVCAP2:
678 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP2);
681 case PCI_EXP_DEVCTL2:
682 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2);
685 case PCI_EXP_LNKCTL2:
686 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2);
690 return PCI_BRIDGE_EMUL_NOT_HANDLED;
693 return PCI_BRIDGE_EMUL_HANDLED;
696 static pci_bridge_emul_read_status_t
697 mvebu_pci_bridge_emul_ext_conf_read(struct pci_bridge_emul *bridge,
700 struct mvebu_pcie_port *port = bridge->data;
704 case PCI_ERR_UNCOR_STATUS:
705 case PCI_ERR_UNCOR_MASK:
706 case PCI_ERR_UNCOR_SEVER:
707 case PCI_ERR_COR_STATUS:
708 case PCI_ERR_COR_MASK:
710 case PCI_ERR_HEADER_LOG+0:
711 case PCI_ERR_HEADER_LOG+4:
712 case PCI_ERR_HEADER_LOG+8:
713 case PCI_ERR_HEADER_LOG+12:
714 case PCI_ERR_ROOT_COMMAND:
715 case PCI_ERR_ROOT_STATUS:
716 case PCI_ERR_ROOT_ERR_SRC:
717 *value = mvebu_readl(port, PCIE_CAP_PCIERR_OFF + reg);
721 return PCI_BRIDGE_EMUL_NOT_HANDLED;
724 return PCI_BRIDGE_EMUL_HANDLED;
728 mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
729 int reg, u32 old, u32 new, u32 mask)
731 struct mvebu_pcie_port *port = bridge->data;
732 struct pci_bridge_emul_conf *conf = &bridge->conf;
736 mvebu_writel(port, new, PCIE_CMD_OFF);
740 if ((mask & 0xffff) && mvebu_has_ioport(port) &&
741 mvebu_pcie_handle_iobase_change(port)) {
742 /* On error disable IO range */
743 conf->iobase &= ~0xf0;
744 conf->iolimit &= ~0xf0;
745 conf->iobase |= 0xf0;
746 conf->iobaseupper = cpu_to_le16(0x0000);
747 conf->iolimitupper = cpu_to_le16(0x0000);
751 case PCI_MEMORY_BASE:
752 if (mvebu_pcie_handle_membase_change(port)) {
753 /* On error disable mem range */
754 conf->membase = cpu_to_le16(le16_to_cpu(conf->membase) & ~0xfff0);
755 conf->memlimit = cpu_to_le16(le16_to_cpu(conf->memlimit) & ~0xfff0);
756 conf->membase = cpu_to_le16(le16_to_cpu(conf->membase) | 0xfff0);
760 case PCI_IO_BASE_UPPER16:
761 if (mvebu_has_ioport(port) &&
762 mvebu_pcie_handle_iobase_change(port)) {
763 /* On error disable IO range */
764 conf->iobase &= ~0xf0;
765 conf->iolimit &= ~0xf0;
766 conf->iobase |= 0xf0;
767 conf->iobaseupper = cpu_to_le16(0x0000);
768 conf->iolimitupper = cpu_to_le16(0x0000);
772 case PCI_PRIMARY_BUS:
774 mvebu_pcie_set_local_bus_nr(port, conf->secondary_bus);
777 case PCI_INTERRUPT_LINE:
778 if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) {
779 u32 ctrl = mvebu_readl(port, PCIE_CTRL_OFF);
780 if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16))
781 ctrl |= PCIE_CTRL_MASTER_HOT_RESET;
783 ctrl &= ~PCIE_CTRL_MASTER_HOT_RESET;
784 mvebu_writel(port, ctrl, PCIE_CTRL_OFF);
794 mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
795 int reg, u32 old, u32 new, u32 mask)
797 struct mvebu_pcie_port *port = bridge->data;
801 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
806 * PCIe requires that the Enable Clock Power Management bit
807 * is hard-wired to zero for downstream ports but HW allows
810 new &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
812 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
817 * Allow to change PCIE_SSPL_ENABLE bit only when slot power
818 * limit was specified in DT and configured into HW.
820 if ((mask & PCI_EXP_SLTCTL_ASPL_DISABLE) &&
821 port->slot_power_limit_value) {
822 u32 sspl = mvebu_readl(port, PCIE_SSPL_OFF);
823 if (new & PCI_EXP_SLTCTL_ASPL_DISABLE)
824 sspl &= ~PCIE_SSPL_ENABLE;
826 sspl |= PCIE_SSPL_ENABLE;
827 mvebu_writel(port, sspl, PCIE_SSPL_OFF);
833 * PME Status bit in Root Status Register (PCIE_RC_RTSTA)
834 * is read-only and can be cleared only by writing 0b to the
835 * Interrupt Cause RW0C register (PCIE_INT_CAUSE_OFF). So
836 * clear PME via Interrupt Cause.
838 if (new & PCI_EXP_RTSTA_PME)
839 mvebu_writel(port, ~PCIE_INT_PM_PME, PCIE_INT_CAUSE_OFF);
842 case PCI_EXP_DEVCTL2:
843 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2);
846 case PCI_EXP_LNKCTL2:
847 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2);
856 mvebu_pci_bridge_emul_ext_conf_write(struct pci_bridge_emul *bridge,
857 int reg, u32 old, u32 new, u32 mask)
859 struct mvebu_pcie_port *port = bridge->data;
862 /* These are W1C registers, so clear other bits */
863 case PCI_ERR_UNCOR_STATUS:
864 case PCI_ERR_COR_STATUS:
865 case PCI_ERR_ROOT_STATUS:
869 case PCI_ERR_UNCOR_MASK:
870 case PCI_ERR_UNCOR_SEVER:
871 case PCI_ERR_COR_MASK:
873 case PCI_ERR_HEADER_LOG+0:
874 case PCI_ERR_HEADER_LOG+4:
875 case PCI_ERR_HEADER_LOG+8:
876 case PCI_ERR_HEADER_LOG+12:
877 case PCI_ERR_ROOT_COMMAND:
878 case PCI_ERR_ROOT_ERR_SRC:
879 mvebu_writel(port, new, PCIE_CAP_PCIERR_OFF + reg);
887 static const struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = {
888 .read_base = mvebu_pci_bridge_emul_base_conf_read,
889 .write_base = mvebu_pci_bridge_emul_base_conf_write,
890 .read_pcie = mvebu_pci_bridge_emul_pcie_conf_read,
891 .write_pcie = mvebu_pci_bridge_emul_pcie_conf_write,
892 .read_ext = mvebu_pci_bridge_emul_ext_conf_read,
893 .write_ext = mvebu_pci_bridge_emul_ext_conf_write,
897 * Initialize the configuration space of the PCI-to-PCI bridge
898 * associated with the given PCIe interface.
900 static int mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
902 unsigned int bridge_flags = PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD;
903 struct pci_bridge_emul *bridge = &port->bridge;
904 u32 dev_id = mvebu_readl(port, PCIE_DEV_ID_OFF);
905 u32 dev_rev = mvebu_readl(port, PCIE_DEV_REV_OFF);
906 u32 ssdev_id = mvebu_readl(port, PCIE_SSDEV_ID_OFF);
907 u32 pcie_cap = mvebu_readl(port, PCIE_CAP_PCIEXP);
908 u8 pcie_cap_ver = ((pcie_cap >> 16) & PCI_EXP_FLAGS_VERS);
910 bridge->conf.vendor = cpu_to_le16(dev_id & 0xffff);
911 bridge->conf.device = cpu_to_le16(dev_id >> 16);
912 bridge->conf.class_revision = cpu_to_le32(dev_rev & 0xff);
914 if (mvebu_has_ioport(port)) {
915 /* We support 32 bits I/O addressing */
916 bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
917 bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
919 bridge_flags |= PCI_BRIDGE_EMUL_NO_IO_FORWARD;
923 * Older mvebu hardware provides PCIe Capability structure only in
924 * version 1. New hardware provides it in version 2.
925 * Enable slot support which is emulated.
927 bridge->pcie_conf.cap = cpu_to_le16(pcie_cap_ver | PCI_EXP_FLAGS_SLOT);
930 * Set Presence Detect State bit permanently as there is no support for
931 * unplugging PCIe card from the slot. Assume that PCIe card is always
934 * Set physical slot number to port+1 as mvebu ports are indexed from
935 * zero and zero value is reserved for ports within the same silicon
936 * as Root Port which is not mvebu case.
938 * Also set correct slot power limit.
940 bridge->pcie_conf.slotcap = cpu_to_le32(
941 FIELD_PREP(PCI_EXP_SLTCAP_SPLV, port->slot_power_limit_value) |
942 FIELD_PREP(PCI_EXP_SLTCAP_SPLS, port->slot_power_limit_scale) |
943 FIELD_PREP(PCI_EXP_SLTCAP_PSN, port->port+1));
944 bridge->pcie_conf.slotsta = cpu_to_le16(PCI_EXP_SLTSTA_PDS);
946 bridge->subsystem_vendor_id = ssdev_id & 0xffff;
947 bridge->subsystem_id = ssdev_id >> 16;
948 bridge->has_pcie = true;
950 bridge->ops = &mvebu_pci_bridge_emul_ops;
952 return pci_bridge_emul_init(bridge, bridge_flags);
955 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
957 return sys->private_data;
960 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
966 for (i = 0; i < pcie->nports; i++) {
967 struct mvebu_pcie_port *port = &pcie->ports[i];
972 if (bus->number == 0 && port->devfn == devfn)
974 if (bus->number != 0 &&
975 bus->number >= port->bridge.conf.secondary_bus &&
976 bus->number <= port->bridge.conf.subordinate_bus)
983 /* PCI configuration space write function */
984 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
985 int where, int size, u32 val)
987 struct mvebu_pcie *pcie = bus->sysdata;
988 struct mvebu_pcie_port *port;
990 port = mvebu_pcie_find_port(pcie, bus, devfn);
992 return PCIBIOS_DEVICE_NOT_FOUND;
994 return pci_bridge_emul_conf_write(&port->bridge, where, size, val);
997 /* PCI configuration space read function */
998 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
1001 struct mvebu_pcie *pcie = bus->sysdata;
1002 struct mvebu_pcie_port *port;
1004 port = mvebu_pcie_find_port(pcie, bus, devfn);
1006 return PCIBIOS_DEVICE_NOT_FOUND;
1008 return pci_bridge_emul_conf_read(&port->bridge, where, size, val);
1011 static struct pci_ops mvebu_pcie_ops = {
1012 .read = mvebu_pcie_rd_conf,
1013 .write = mvebu_pcie_wr_conf,
1016 static void mvebu_pcie_intx_irq_mask(struct irq_data *d)
1018 struct mvebu_pcie_port *port = d->domain->host_data;
1019 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1020 unsigned long flags;
1023 raw_spin_lock_irqsave(&port->irq_lock, flags);
1024 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF);
1025 unmask &= ~PCIE_INT_INTX(hwirq);
1026 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF);
1027 raw_spin_unlock_irqrestore(&port->irq_lock, flags);
1030 static void mvebu_pcie_intx_irq_unmask(struct irq_data *d)
1032 struct mvebu_pcie_port *port = d->domain->host_data;
1033 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1034 unsigned long flags;
1037 raw_spin_lock_irqsave(&port->irq_lock, flags);
1038 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF);
1039 unmask |= PCIE_INT_INTX(hwirq);
1040 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF);
1041 raw_spin_unlock_irqrestore(&port->irq_lock, flags);
1044 static struct irq_chip intx_irq_chip = {
1045 .name = "mvebu-INTx",
1046 .irq_mask = mvebu_pcie_intx_irq_mask,
1047 .irq_unmask = mvebu_pcie_intx_irq_unmask,
1050 static int mvebu_pcie_intx_irq_map(struct irq_domain *h,
1051 unsigned int virq, irq_hw_number_t hwirq)
1053 struct mvebu_pcie_port *port = h->host_data;
1055 irq_set_status_flags(virq, IRQ_LEVEL);
1056 irq_set_chip_and_handler(virq, &intx_irq_chip, handle_level_irq);
1057 irq_set_chip_data(virq, port);
1062 static const struct irq_domain_ops mvebu_pcie_intx_irq_domain_ops = {
1063 .map = mvebu_pcie_intx_irq_map,
1064 .xlate = irq_domain_xlate_onecell,
1067 static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port)
1069 struct device *dev = &port->pcie->pdev->dev;
1070 struct device_node *pcie_intc_node;
1072 raw_spin_lock_init(&port->irq_lock);
1074 pcie_intc_node = of_get_next_child(port->dn, NULL);
1075 if (!pcie_intc_node) {
1076 dev_err(dev, "No PCIe Intc node found for %s\n", port->name);
1080 port->intx_irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
1081 &mvebu_pcie_intx_irq_domain_ops,
1083 of_node_put(pcie_intc_node);
1084 if (!port->intx_irq_domain) {
1085 dev_err(dev, "Failed to get INTx IRQ domain for %s\n", port->name);
1092 static void mvebu_pcie_irq_handler(struct irq_desc *desc)
1094 struct mvebu_pcie_port *port = irq_desc_get_handler_data(desc);
1095 struct irq_chip *chip = irq_desc_get_chip(desc);
1096 struct device *dev = &port->pcie->pdev->dev;
1097 u32 cause, unmask, status;
1100 chained_irq_enter(chip, desc);
1102 cause = mvebu_readl(port, PCIE_INT_CAUSE_OFF);
1103 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF);
1104 status = cause & unmask;
1106 /* Process legacy INTx interrupts */
1107 for (i = 0; i < PCI_NUM_INTX; i++) {
1108 if (!(status & PCIE_INT_INTX(i)))
1111 if (generic_handle_domain_irq(port->intx_irq_domain, i) == -EINVAL)
1112 dev_err_ratelimited(dev, "unexpected INT%c IRQ\n", (char)i+'A');
1115 chained_irq_exit(chip, desc);
1118 static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
1120 /* Interrupt support on mvebu emulated bridges is not implemented yet */
1121 if (dev->bus->number == 0)
1122 return 0; /* Proper return code 0 == NO_IRQ */
1124 return of_irq_parse_and_map_pci(dev, slot, pin);
1127 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
1128 const struct resource *res,
1129 resource_size_t start,
1130 resource_size_t size,
1131 resource_size_t align)
1133 if (dev->bus->number != 0)
1137 * On the PCI-to-PCI bridge side, the I/O windows must have at
1138 * least a 64 KB size and the memory windows must have at
1139 * least a 1 MB size. Moreover, MBus windows need to have a
1140 * base address aligned on their size, and their size must be
1141 * a power of two. This means that if the BAR doesn't have a
1142 * power of two size, several MBus windows will actually be
1143 * created. We need to ensure that the biggest MBus window
1144 * (which will be the first one) is aligned on its size, which
1145 * explains the rounddown_pow_of_two() being done here.
1147 if (res->flags & IORESOURCE_IO)
1148 return round_up(start, max_t(resource_size_t, SZ_64K,
1149 rounddown_pow_of_two(size)));
1150 else if (res->flags & IORESOURCE_MEM)
1151 return round_up(start, max_t(resource_size_t, SZ_1M,
1152 rounddown_pow_of_two(size)));
1157 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
1158 struct device_node *np,
1159 struct mvebu_pcie_port *port)
1163 ret = of_address_to_resource(np, 0, &port->regs);
1165 return (void __iomem *)ERR_PTR(ret);
1167 return devm_ioremap_resource(&pdev->dev, &port->regs);
1170 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
1171 #define DT_TYPE_IO 0x1
1172 #define DT_TYPE_MEM32 0x2
1173 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
1174 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
1176 static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
1181 const int na = 3, ns = 2;
1182 const __be32 *range;
1183 int rlen, nranges, rangesz, pna, i;
1188 range = of_get_property(np, "ranges", &rlen);
1192 pna = of_n_addr_cells(np);
1193 rangesz = pna + na + ns;
1194 nranges = rlen / sizeof(__be32) / rangesz;
1196 for (i = 0; i < nranges; i++, range += rangesz) {
1197 u32 flags = of_read_number(range, 1);
1198 u32 slot = of_read_number(range + 1, 1);
1199 u64 cpuaddr = of_read_number(range + na, pna);
1200 unsigned long rtype;
1202 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
1203 rtype = IORESOURCE_IO;
1204 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
1205 rtype = IORESOURCE_MEM;
1209 if (slot == PCI_SLOT(devfn) && type == rtype) {
1210 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
1211 *attr = DT_CPUADDR_TO_ATTR(cpuaddr);
1219 static int mvebu_pcie_suspend(struct device *dev)
1221 struct mvebu_pcie *pcie;
1224 pcie = dev_get_drvdata(dev);
1225 for (i = 0; i < pcie->nports; i++) {
1226 struct mvebu_pcie_port *port = pcie->ports + i;
1229 port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
1235 static int mvebu_pcie_resume(struct device *dev)
1237 struct mvebu_pcie *pcie;
1240 pcie = dev_get_drvdata(dev);
1241 for (i = 0; i < pcie->nports; i++) {
1242 struct mvebu_pcie_port *port = pcie->ports + i;
1245 mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
1246 mvebu_pcie_setup_hw(port);
1252 static void mvebu_pcie_port_clk_put(void *data)
1254 struct mvebu_pcie_port *port = data;
1259 static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
1260 struct mvebu_pcie_port *port, struct device_node *child)
1262 struct device *dev = &pcie->pdev->dev;
1263 enum of_gpio_flags flags;
1264 u32 slot_power_limit;
1265 int reset_gpio, ret;
1270 if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) {
1271 dev_warn(dev, "ignoring %pOF, missing pcie-port property\n",
1276 if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane))
1279 if (!of_property_read_u32(child, "num-lanes", &num_lanes) && num_lanes == 4)
1282 port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port,
1289 port->devfn = of_pci_get_devfn(child);
1290 if (port->devfn < 0)
1292 if (PCI_FUNC(port->devfn) != 0) {
1293 dev_err(dev, "%s: invalid function number, must be zero\n",
1298 ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
1299 &port->mem_target, &port->mem_attr);
1301 dev_err(dev, "%s: cannot get tgt/attr for mem window\n",
1306 if (resource_size(&pcie->io) != 0) {
1307 mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO,
1308 &port->io_target, &port->io_attr);
1310 port->io_target = -1;
1315 * Old DT bindings do not contain "intx" interrupt
1316 * so do not fail probing driver when interrupt does not exist.
1318 port->intx_irq = of_irq_get_byname(child, "intx");
1319 if (port->intx_irq == -EPROBE_DEFER) {
1320 ret = port->intx_irq;
1323 if (port->intx_irq <= 0) {
1324 dev_warn(dev, "%s: legacy INTx interrupts cannot be masked individually, "
1325 "%pOF does not contain intx interrupt\n",
1329 reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags);
1330 if (reset_gpio == -EPROBE_DEFER) {
1335 if (gpio_is_valid(reset_gpio)) {
1336 unsigned long gpio_flags;
1338 port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset",
1340 if (!port->reset_name) {
1345 if (flags & OF_GPIO_ACTIVE_LOW) {
1346 dev_info(dev, "%pOF: reset gpio is active low\n",
1348 gpio_flags = GPIOF_ACTIVE_LOW |
1351 gpio_flags = GPIOF_OUT_INIT_HIGH;
1354 ret = devm_gpio_request_one(dev, reset_gpio, gpio_flags,
1357 if (ret == -EPROBE_DEFER)
1362 port->reset_gpio = gpio_to_desc(reset_gpio);
1365 slot_power_limit = of_pci_get_slot_power_limit(child,
1366 &port->slot_power_limit_value,
1367 &port->slot_power_limit_scale);
1368 if (slot_power_limit)
1369 dev_info(dev, "%s: Slot power limit %u.%uW\n",
1371 slot_power_limit / 1000,
1372 (slot_power_limit / 100) % 10);
1374 port->clk = of_clk_get_by_name(child, NULL);
1375 if (IS_ERR(port->clk)) {
1376 dev_err(dev, "%s: cannot get clock\n", port->name);
1380 ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
1391 /* In the case of skipping, we need to free these */
1392 devm_kfree(dev, port->reset_name);
1393 port->reset_name = NULL;
1394 devm_kfree(dev, port->name);
1402 * Power up a PCIe port. PCIe requires the refclk to be stable for 100µs
1403 * prior to releasing PERST. See table 2-4 in section 2.6.2 AC Specifications
1404 * of the PCI Express Card Electromechanical Specification, 1.1.
1406 static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
1410 ret = clk_prepare_enable(port->clk);
1414 if (port->reset_gpio) {
1415 u32 reset_udelay = PCI_PM_D3COLD_WAIT * 1000;
1417 of_property_read_u32(port->dn, "reset-delay-us",
1422 gpiod_set_value_cansleep(port->reset_gpio, 0);
1423 msleep(reset_udelay / 1000);
1430 * Power down a PCIe port. Strictly, PCIe requires us to place the card
1431 * in D3hot state before asserting PERST#.
1433 static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
1435 gpiod_set_value_cansleep(port->reset_gpio, 1);
1437 clk_disable_unprepare(port->clk);
1441 * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
1442 * so we need extra resource setup parsing our special DT properties encoding
1443 * the MEM and IO apertures.
1445 static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
1447 struct device *dev = &pcie->pdev->dev;
1448 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1451 /* Get the PCIe memory aperture */
1452 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
1453 if (resource_size(&pcie->mem) == 0) {
1454 dev_err(dev, "invalid memory aperture size\n");
1458 pcie->mem.name = "PCI MEM";
1459 pci_add_resource(&bridge->windows, &pcie->mem);
1460 ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
1464 /* Get the PCIe IO aperture */
1465 mvebu_mbus_get_pcie_io_aperture(&pcie->io);
1467 if (resource_size(&pcie->io) != 0) {
1468 pcie->realio.flags = pcie->io.flags;
1469 pcie->realio.start = PCIBIOS_MIN_IO;
1470 pcie->realio.end = min_t(resource_size_t,
1471 IO_SPACE_LIMIT - SZ_64K,
1472 resource_size(&pcie->io) - 1);
1473 pcie->realio.name = "PCI I/O";
1475 ret = devm_pci_remap_iospace(dev, &pcie->realio, pcie->io.start);
1479 pci_add_resource(&bridge->windows, &pcie->realio);
1480 ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
1488 static int mvebu_pcie_probe(struct platform_device *pdev)
1490 struct device *dev = &pdev->dev;
1491 struct mvebu_pcie *pcie;
1492 struct pci_host_bridge *bridge;
1493 struct device_node *np = dev->of_node;
1494 struct device_node *child;
1497 bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct mvebu_pcie));
1501 pcie = pci_host_bridge_priv(bridge);
1503 platform_set_drvdata(pdev, pcie);
1505 ret = mvebu_pcie_parse_request_resources(pcie);
1509 num = of_get_available_child_count(np);
1511 pcie->ports = devm_kcalloc(dev, num, sizeof(*pcie->ports), GFP_KERNEL);
1516 for_each_available_child_of_node(np, child) {
1517 struct mvebu_pcie_port *port = &pcie->ports[i];
1519 ret = mvebu_pcie_parse_port(pcie, port, child);
1523 } else if (ret == 0) {
1532 for (i = 0; i < pcie->nports; i++) {
1533 struct mvebu_pcie_port *port = &pcie->ports[i];
1534 int irq = port->intx_irq;
1540 ret = mvebu_pcie_powerup(port);
1544 port->base = mvebu_pcie_map_registers(pdev, child, port);
1545 if (IS_ERR(port->base)) {
1546 dev_err(dev, "%s: cannot map registers\n", port->name);
1548 mvebu_pcie_powerdown(port);
1552 ret = mvebu_pci_bridge_emul_init(port);
1554 dev_err(dev, "%s: cannot init emulated bridge\n",
1556 devm_iounmap(dev, port->base);
1558 mvebu_pcie_powerdown(port);
1563 ret = mvebu_pcie_init_irq_domain(port);
1565 dev_err(dev, "%s: cannot init irq domain\n",
1567 pci_bridge_emul_cleanup(&port->bridge);
1568 devm_iounmap(dev, port->base);
1570 mvebu_pcie_powerdown(port);
1573 irq_set_chained_handler_and_data(irq,
1574 mvebu_pcie_irq_handler,
1579 * PCIe topology exported by mvebu hw is quite complicated. In
1580 * reality has something like N fully independent host bridges
1581 * where each host bridge has one PCIe Root Port (which acts as
1582 * PCI Bridge device). Each host bridge has its own independent
1583 * internal registers, independent access to PCI config space,
1584 * independent interrupt lines, independent window and memory
1585 * access configuration. But additionally there is some kind of
1586 * peer-to-peer support between PCIe devices behind different
1587 * host bridges limited just to forwarding of memory and I/O
1588 * transactions (forwarding of error messages and config cycles
1589 * is not supported). So we could say there are N independent
1590 * PCIe Root Complexes.
1592 * For this kind of setup DT should have been structured into
1593 * N independent PCIe controllers / host bridges. But instead
1594 * structure in past was defined to put PCIe Root Ports of all
1595 * host bridges into one bus zero, like in classic multi-port
1596 * Root Complex setup with just one host bridge.
1598 * This means that pci-mvebu.c driver provides "virtual" bus 0
1599 * on which registers all PCIe Root Ports (PCI Bridge devices)
1600 * specified in DT by their BDF addresses and virtually routes
1601 * PCI config access of each PCI bridge device to specific PCIe
1604 * Normally PCI Bridge should choose between Type 0 and Type 1
1605 * config requests based on primary and secondary bus numbers
1606 * configured on the bridge itself. But because mvebu PCI Bridge
1607 * does not have registers for primary and secondary bus numbers
1608 * in its config space, it determinates type of config requests
1609 * via its own custom way.
1611 * There are two options how mvebu determinate type of config
1614 * 1. If Secondary Bus Number Enable bit is not set or is not
1615 * available (applies for pre-XP PCIe controllers) then Type 0
1616 * is used if target bus number equals Local Bus Number (bits
1617 * [15:8] in register 0x1a04) and target device number differs
1618 * from Local Device Number (bits [20:16] in register 0x1a04).
1619 * Type 1 is used if target bus number differs from Local Bus
1620 * Number. And when target bus number equals Local Bus Number
1621 * and target device equals Local Device Number then request is
1622 * routed to Local PCI Bridge (PCIe Root Port).
1624 * 2. If Secondary Bus Number Enable bit is set (bit 7 in
1625 * register 0x1a2c) then mvebu hw determinate type of config
1626 * request like compliant PCI Bridge based on primary bus number
1627 * which is configured via Local Bus Number (bits [15:8] in
1628 * register 0x1a04) and secondary bus number which is configured
1629 * via Secondary Bus Number (bits [7:0] in register 0x1a2c).
1630 * Local PCI Bridge (PCIe Root Port) is available on primary bus
1631 * as device with Local Device Number (bits [20:16] in register
1634 * Secondary Bus Number Enable bit is disabled by default and
1635 * option 2. is not available on pre-XP PCIe controllers. Hence
1636 * this driver always use option 1.
1638 * Basically it means that primary and secondary buses shares
1639 * one virtual number configured via Local Bus Number bits and
1640 * Local Device Number bits determinates if accessing primary
1641 * or secondary bus. Set Local Device Number to 1 and redirect
1642 * all writes of PCI Bridge Secondary Bus Number register to
1643 * Local Bus Number (bits [15:8] in register 0x1a04).
1645 * So when accessing devices on buses behind secondary bus
1646 * number it would work correctly. And also when accessing
1647 * device 0 at secondary bus number via config space would be
1648 * correctly routed to secondary bus. Due to issues described
1649 * in mvebu_pcie_setup_hw(), PCI Bridges at primary bus (zero)
1650 * are not accessed directly via PCI config space but rarher
1651 * indirectly via kernel emulated PCI bridge driver.
1653 mvebu_pcie_setup_hw(port);
1654 mvebu_pcie_set_local_dev_nr(port, 1);
1655 mvebu_pcie_set_local_bus_nr(port, 0);
1658 bridge->sysdata = pcie;
1659 bridge->ops = &mvebu_pcie_ops;
1660 bridge->child_ops = &mvebu_pcie_child_ops;
1661 bridge->align_resource = mvebu_pcie_align_resource;
1662 bridge->map_irq = mvebu_pcie_map_irq;
1664 return pci_host_probe(bridge);
1667 static int mvebu_pcie_remove(struct platform_device *pdev)
1669 struct mvebu_pcie *pcie = platform_get_drvdata(pdev);
1670 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1674 /* Remove PCI bus with all devices. */
1675 pci_lock_rescan_remove();
1676 pci_stop_root_bus(bridge->bus);
1677 pci_remove_root_bus(bridge->bus);
1678 pci_unlock_rescan_remove();
1680 for (i = 0; i < pcie->nports; i++) {
1681 struct mvebu_pcie_port *port = &pcie->ports[i];
1682 int irq = port->intx_irq;
1687 /* Disable Root Bridge I/O space, memory space and bus mastering. */
1688 cmd = mvebu_readl(port, PCIE_CMD_OFF);
1689 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
1690 mvebu_writel(port, cmd, PCIE_CMD_OFF);
1692 /* Mask all interrupt sources. */
1693 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_UNMASK_OFF);
1695 /* Clear all interrupt causes. */
1696 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF);
1699 irq_set_chained_handler_and_data(irq, NULL, NULL);
1701 /* Remove IRQ domains. */
1702 if (port->intx_irq_domain)
1703 irq_domain_remove(port->intx_irq_domain);
1705 /* Free config space for emulated root bridge. */
1706 pci_bridge_emul_cleanup(&port->bridge);
1708 /* Disable sending Set_Slot_Power_Limit PCIe Message. */
1709 sspl = mvebu_readl(port, PCIE_SSPL_OFF);
1710 sspl &= ~(PCIE_SSPL_VALUE_MASK | PCIE_SSPL_SCALE_MASK | PCIE_SSPL_ENABLE);
1711 mvebu_writel(port, sspl, PCIE_SSPL_OFF);
1713 /* Disable and clear BARs and windows. */
1714 mvebu_pcie_disable_wins(port);
1716 /* Delete PCIe IO and MEM windows. */
1717 if (port->iowin.size)
1718 mvebu_pcie_del_windows(port, port->iowin.base, port->iowin.size);
1719 if (port->memwin.size)
1720 mvebu_pcie_del_windows(port, port->memwin.base, port->memwin.size);
1722 /* Power down card and disable clocks. Must be the last step. */
1723 mvebu_pcie_powerdown(port);
1729 static const struct of_device_id mvebu_pcie_of_match_table[] = {
1730 { .compatible = "marvell,armada-xp-pcie", },
1731 { .compatible = "marvell,armada-370-pcie", },
1732 { .compatible = "marvell,dove-pcie", },
1733 { .compatible = "marvell,kirkwood-pcie", },
1737 static const struct dev_pm_ops mvebu_pcie_pm_ops = {
1738 NOIRQ_SYSTEM_SLEEP_PM_OPS(mvebu_pcie_suspend, mvebu_pcie_resume)
1741 static struct platform_driver mvebu_pcie_driver = {
1743 .name = "mvebu-pcie",
1744 .of_match_table = mvebu_pcie_of_match_table,
1745 .pm = &mvebu_pcie_pm_ops,
1747 .probe = mvebu_pcie_probe,
1748 .remove = mvebu_pcie_remove,
1750 module_platform_driver(mvebu_pcie_driver);
1754 MODULE_DESCRIPTION("Marvell EBU PCIe controller");
1755 MODULE_LICENSE("GPL v2");