1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015 Marvell International Ltd.
5 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
8 * - drivers/pci/pcie_imx.c
9 * - drivers/pci/pci_mvebu.c
10 * - drivers/pci/pcie_xilinx.c
18 #include <asm-generic/gpio.h>
19 #include <linux/delay.h>
21 DECLARE_GLOBAL_DATA_PTR;
23 /* PCI Config space registers */
24 #define PCIE_CONFIG_BAR0 0x10
25 #define PCIE_LINK_STATUS_REG 0x80
26 #define PCIE_LINK_STATUS_SPEED_OFF 16
27 #define PCIE_LINK_STATUS_SPEED_MASK (0xf << PCIE_LINK_STATUS_SPEED_OFF)
28 #define PCIE_LINK_STATUS_WIDTH_OFF 20
29 #define PCIE_LINK_STATUS_WIDTH_MASK (0xf << PCIE_LINK_STATUS_WIDTH_OFF)
31 /* Resizable bar capability registers */
32 #define RESIZABLE_BAR_CAP 0x250
33 #define RESIZABLE_BAR_CTL0 0x254
34 #define RESIZABLE_BAR_CTL1 0x258
37 #define PCIE_ATU_VIEWPORT 0x900
38 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
39 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
40 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
41 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
42 #define PCIE_ATU_CR1 0x904
43 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
44 #define PCIE_ATU_TYPE_IO (0x2 << 0)
45 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
46 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
47 #define PCIE_ATU_CR2 0x908
48 #define PCIE_ATU_ENABLE (0x1 << 31)
49 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
50 #define PCIE_ATU_LOWER_BASE 0x90C
51 #define PCIE_ATU_UPPER_BASE 0x910
52 #define PCIE_ATU_LIMIT 0x914
53 #define PCIE_ATU_LOWER_TARGET 0x918
54 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
55 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
56 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
57 #define PCIE_ATU_UPPER_TARGET 0x91C
59 #define PCIE_LINK_CAPABILITY 0x7C
60 #define PCIE_LINK_CTL_2 0xA0
61 #define TARGET_LINK_SPEED_MASK 0xF
62 #define LINK_SPEED_GEN_1 0x1
63 #define LINK_SPEED_GEN_2 0x2
64 #define LINK_SPEED_GEN_3 0x3
66 #define PCIE_GEN3_RELATED 0x890
67 #define GEN3_EQU_DISABLE (1 << 16)
68 #define GEN3_ZRXDC_NON_COMP (1 << 0)
70 #define PCIE_GEN3_EQU_CTRL 0x8A8
71 #define GEN3_EQU_EVAL_2MS_DISABLE (1 << 5)
73 #define PCIE_ROOT_COMPLEX_MODE_MASK (0xF << 4)
75 #define PCIE_LINK_UP_TIMEOUT_MS 100
77 #define PCIE_GLOBAL_CONTROL 0x8000
78 #define PCIE_APP_LTSSM_EN (1 << 2)
79 #define PCIE_DEVICE_TYPE_OFFSET (4)
80 #define PCIE_DEVICE_TYPE_MASK (0xF)
81 #define PCIE_DEVICE_TYPE_EP (0x0) /* Endpoint */
82 #define PCIE_DEVICE_TYPE_LEP (0x1) /* Legacy endpoint */
83 #define PCIE_DEVICE_TYPE_RC (0x4) /* Root complex */
85 #define PCIE_GLOBAL_STATUS 0x8008
86 #define PCIE_GLB_STS_RDLH_LINK_UP (1 << 1)
87 #define PCIE_GLB_STS_PHY_LINK_UP (1 << 9)
89 #define PCIE_ARCACHE_TRC 0x8050
90 #define PCIE_AWCACHE_TRC 0x8054
91 #define ARCACHE_SHAREABLE_CACHEABLE 0x3511
92 #define AWCACHE_SHAREABLE_CACHEABLE 0x5311
94 #define LINK_SPEED_GEN_1 0x1
95 #define LINK_SPEED_GEN_2 0x2
96 #define LINK_SPEED_GEN_3 0x3
99 * struct pcie_dw_mvebu - MVEBU DW PCIe controller state
101 * @ctrl_base: The base address of the register space
102 * @cfg_base: The base address of the configuration space
103 * @cfg_size: The size of the configuration space which is needed
104 * as it gets written into the PCIE_ATU_LIMIT register
105 * @first_busno: This driver supports multiple PCIe controllers.
106 * first_busno stores the bus number of the PCIe root-port
107 * number which may vary depending on the PCIe setup
108 * (PEX switches etc).
110 struct pcie_dw_mvebu {
116 /* IO and MEM PCI regions */
117 struct pci_region io;
118 struct pci_region mem;
121 static int pcie_dw_get_link_speed(const void *regs_base)
123 return (readl(regs_base + PCIE_LINK_STATUS_REG) &
124 PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
127 static int pcie_dw_get_link_width(const void *regs_base)
129 return (readl(regs_base + PCIE_LINK_STATUS_REG) &
130 PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
134 * pcie_dw_prog_outbound_atu() - Configure ATU for outbound accesses
136 * @pcie: Pointer to the PCI controller state
137 * @index: ATU region index
138 * @type: ATU accsess type
139 * @cpu_addr: the physical address for the translation entry
140 * @pci_addr: the pcie bus address for the translation entry
141 * @size: the size of the translation entry
143 static void pcie_dw_prog_outbound_atu(struct pcie_dw_mvebu *pcie, int index,
144 int type, u64 cpu_addr, u64 pci_addr,
147 writel(PCIE_ATU_REGION_OUTBOUND | index,
148 pcie->ctrl_base + PCIE_ATU_VIEWPORT);
149 writel(lower_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_LOWER_BASE);
150 writel(upper_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_UPPER_BASE);
151 writel(lower_32_bits(cpu_addr + size - 1),
152 pcie->ctrl_base + PCIE_ATU_LIMIT);
153 writel(lower_32_bits(pci_addr),
154 pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
155 writel(upper_32_bits(pci_addr),
156 pcie->ctrl_base + PCIE_ATU_UPPER_TARGET);
157 writel(type, pcie->ctrl_base + PCIE_ATU_CR1);
158 writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2);
162 * set_cfg_address() - Configure the PCIe controller config space access
164 * @pcie: Pointer to the PCI controller state
165 * @d: PCI device to access
166 * @where: Offset in the configuration space
168 * Configures the PCIe controller to access the configuration space of
169 * a specific PCIe device and returns the address to use for this
172 * Return: Address that can be used to access the configation space
173 * of the requested device / offset
175 static uintptr_t set_cfg_address(struct pcie_dw_mvebu *pcie,
176 pci_dev_t d, uint where)
178 uintptr_t va_address;
182 * Region #0 is used for Outbound CFG space access.
183 * Direction = Outbound
187 if (PCI_BUS(d) == (pcie->first_busno + 1))
188 /* For local bus, change TLP Type field to 4. */
189 atu_type = PCIE_ATU_TYPE_CFG0;
191 /* Otherwise, change TLP Type field to 5. */
192 atu_type = PCIE_ATU_TYPE_CFG1;
194 if (PCI_BUS(d) == pcie->first_busno) {
195 /* Accessing root port configuration space. */
196 va_address = (uintptr_t)pcie->ctrl_base;
198 d = PCI_MASK_BUS(d) | (PCI_BUS(d) - pcie->first_busno);
199 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
200 atu_type, (u64)pcie->cfg_base,
201 d << 8, pcie->cfg_size);
202 va_address = (uintptr_t)pcie->cfg_base;
205 va_address += where & ~0x3;
211 * pcie_dw_addr_valid() - Check for valid bus address
213 * @d: The PCI device to access
214 * @first_busno: Bus number of the PCIe controller root complex
216 * Return 1 (true) if the PCI device can be accessed by this controller.
218 * Return: 1 on valid, 0 on invalid
220 static int pcie_dw_addr_valid(pci_dev_t d, int first_busno)
222 if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0))
224 if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0))
231 * pcie_dw_mvebu_read_config() - Read from configuration space
233 * @bus: Pointer to the PCI bus
234 * @bdf: Identifies the PCIe device to access
235 * @offset: The offset into the device's configuration space
236 * @valuep: A pointer at which to store the read value
237 * @size: Indicates the size of access to perform
239 * Read a value of size @size from offset @offset within the configuration
240 * space of the device identified by the bus, device & function numbers in @bdf
241 * on the PCI bus @bus.
243 * Return: 0 on success
245 static int pcie_dw_mvebu_read_config(const struct udevice *bus, pci_dev_t bdf,
246 uint offset, ulong *valuep,
247 enum pci_size_t size)
249 struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
250 uintptr_t va_address;
253 debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
254 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
256 if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
257 debug("- out of range\n");
258 *valuep = pci_get_ff(size);
262 va_address = set_cfg_address(pcie, bdf, offset);
264 value = readl(va_address);
266 debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
267 *valuep = pci_conv_32_to_size(value, offset, size);
269 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
270 PCIE_ATU_TYPE_IO, pcie->io.phys_start,
271 pcie->io.bus_start, pcie->io.size);
277 * pcie_dw_mvebu_write_config() - Write to configuration space
279 * @bus: Pointer to the PCI bus
280 * @bdf: Identifies the PCIe device to access
281 * @offset: The offset into the device's configuration space
282 * @value: The value to write
283 * @size: Indicates the size of access to perform
285 * Write the value @value of size @size from offset @offset within the
286 * configuration space of the device identified by the bus, device & function
287 * numbers in @bdf on the PCI bus @bus.
289 * Return: 0 on success
291 static int pcie_dw_mvebu_write_config(struct udevice *bus, pci_dev_t bdf,
292 uint offset, ulong value,
293 enum pci_size_t size)
295 struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
296 uintptr_t va_address;
299 debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
300 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
301 debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
303 if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
304 debug("- out of range\n");
308 va_address = set_cfg_address(pcie, bdf, offset);
310 old = readl(va_address);
311 value = pci_conv_size_to_32(old, value, offset, size);
312 writel(value, va_address);
314 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
315 PCIE_ATU_TYPE_IO, pcie->io.phys_start,
316 pcie->io.bus_start, pcie->io.size);
322 * pcie_dw_configure() - Configure link capabilities and speed
324 * @regs_base: A pointer to the PCIe controller registers
325 * @cap_speed: The capabilities and speed to configure
327 * Configure the link capabilities and speed in the PCIe root complex.
329 static void pcie_dw_configure(const void *regs_base, u32 cap_speed)
332 * TODO (shadi@marvell.com, sr@denx.de):
333 * Need to read the serdes speed from the dts and according to it
334 * configure the PCIe gen
337 /* Set link to GEN 3 */
338 clrsetbits_le32(regs_base + PCIE_LINK_CTL_2,
339 TARGET_LINK_SPEED_MASK, cap_speed);
340 clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY,
341 TARGET_LINK_SPEED_MASK, cap_speed);
342 setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE);
346 * is_link_up() - Return the link state
348 * @regs_base: A pointer to the PCIe controller registers
350 * Return: 1 (true) for active line and 0 (false) for no link
352 static int is_link_up(const void *regs_base)
354 u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
357 reg = readl(regs_base + PCIE_GLOBAL_STATUS);
358 if ((reg & mask) == mask)
365 * wait_link_up() - Wait for the link to come up
367 * @regs_base: A pointer to the PCIe controller registers
369 * Return: 1 (true) for active line and 0 (false) for no link (timeout)
371 static int wait_link_up(const void *regs_base)
373 unsigned long timeout;
375 timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
376 while (!is_link_up(regs_base)) {
377 if (get_timer(0) > timeout)
385 * pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port
387 * @regs_base: A pointer to the PCIe controller registers
388 * @cap_speed: The capabilities and speed to configure
390 * Configure the PCIe controller root complex depending on the
391 * requested link capabilities and speed.
393 * Return: 1 (true) for active line and 0 (false) for no link
395 static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed)
397 if (!is_link_up(regs_base)) {
398 /* Disable LTSSM state machine to enable configuration */
399 clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
403 clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
404 PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET,
405 PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET);
407 /* Set the PCIe master AXI attributes */
408 writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC);
409 writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC);
411 /* DW pre link configurations */
412 pcie_dw_configure(regs_base, cap_speed);
414 if (!is_link_up(regs_base)) {
415 /* Configuration done. Start LTSSM */
416 setbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
420 /* Check that link was established */
421 if (!wait_link_up(regs_base))
425 * Link can be established in Gen 1. still need to wait
426 * till MAC nagaotiation is completed
434 * pcie_dw_set_host_bars() - Configure the host BARs
436 * @regs_base: A pointer to the PCIe controller registers
438 * Configure the host BARs of the PCIe controller root port so that
439 * PCI(e) devices may access the system memory.
441 static void pcie_dw_set_host_bars(const void *regs_base)
443 u32 size = gd->ram_size;
448 /* Verify the maximal BAR size */
449 reg = readl(regs_base + RESIZABLE_BAR_CAP);
450 max_size = 1ULL << (5 + (reg + (1 << 4)));
452 if (size > max_size) {
454 printf("Warning: PCIe BARs can't map all DRAM space\n");
457 /* Set the BAR base and size towards DDR */
458 bar0 = CONFIG_SYS_SDRAM_BASE & ~0xf;
459 bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32;
460 writel(CONFIG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0);
462 reg = ((size >> 20) - 1) << 12;
463 writel(size, regs_base + RESIZABLE_BAR_CTL0);
467 * pcie_dw_mvebu_probe() - Probe the PCIe bus for active link
469 * @dev: A pointer to the device being operated on
471 * Probe for an active link on the PCIe bus and configure the controller
472 * to enable this port.
474 * Return: 0 on success, else -ENODEV
476 static int pcie_dw_mvebu_probe(struct udevice *dev)
478 struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
479 struct udevice *ctlr = pci_get_controller(dev);
480 struct pci_controller *hose = dev_get_uclass_priv(ctlr);
481 #if CONFIG_IS_ENABLED(DM_GPIO)
482 struct gpio_desc reset_gpio;
484 gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio,
487 * Issue reset to add-in card trough the dedicated GPIO.
488 * Some boards are connecting the card reset pin to common system
489 * reset wire and others are using separate GPIO port.
490 * In the last case we have to release a reset of the addon card
493 if (dm_gpio_is_valid(&reset_gpio)) {
494 dm_gpio_set_value(&reset_gpio, 1); /* assert */
496 dm_gpio_set_value(&reset_gpio, 0); /* de-assert */
500 debug("PCIE Reset on GPIO support is missing\n");
503 pcie->first_busno = dev->seq;
505 /* Don't register host if link is down */
506 if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) {
507 printf("PCIE-%d: Link down\n", dev->seq);
509 printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev->seq,
510 pcie_dw_get_link_speed(pcie->ctrl_base),
511 pcie_dw_get_link_width(pcie->ctrl_base),
515 /* Store the IO and MEM windows settings for future use by the ATU */
516 pcie->io.phys_start = hose->regions[0].phys_start; /* IO base */
517 pcie->io.bus_start = hose->regions[0].bus_start; /* IO_bus_addr */
518 pcie->io.size = hose->regions[0].size; /* IO size */
520 pcie->mem.phys_start = hose->regions[1].phys_start; /* MEM base */
521 pcie->mem.bus_start = hose->regions[1].bus_start; /* MEM_bus_addr */
522 pcie->mem.size = hose->regions[1].size; /* MEM size */
524 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX1,
525 PCIE_ATU_TYPE_MEM, pcie->mem.phys_start,
526 pcie->mem.bus_start, pcie->mem.size);
528 /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
529 clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION,
530 0xffff << 16, PCI_CLASS_BRIDGE_PCI << 16);
532 pcie_dw_set_host_bars(pcie->ctrl_base);
538 * pcie_dw_mvebu_ofdata_to_platdata() - Translate from DT to device state
540 * @dev: A pointer to the device being operated on
542 * Translate relevant data from the device tree pertaining to device @dev into
543 * state that the driver will later make use of. This state is stored in the
544 * device's private data structure.
546 * Return: 0 on success, else -EINVAL
548 static int pcie_dw_mvebu_ofdata_to_platdata(struct udevice *dev)
550 struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
552 /* Get the controller base address */
553 pcie->ctrl_base = (void *)devfdt_get_addr_index(dev, 0);
554 if ((fdt_addr_t)pcie->ctrl_base == FDT_ADDR_T_NONE)
557 /* Get the config space base address and size */
558 pcie->cfg_base = (void *)devfdt_get_addr_size_index(dev, 1,
560 if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
566 static const struct dm_pci_ops pcie_dw_mvebu_ops = {
567 .read_config = pcie_dw_mvebu_read_config,
568 .write_config = pcie_dw_mvebu_write_config,
571 static const struct udevice_id pcie_dw_mvebu_ids[] = {
572 { .compatible = "marvell,armada8k-pcie" },
576 U_BOOT_DRIVER(pcie_dw_mvebu) = {
577 .name = "pcie_dw_mvebu",
579 .of_match = pcie_dw_mvebu_ids,
580 .ops = &pcie_dw_mvebu_ops,
581 .ofdata_to_platdata = pcie_dw_mvebu_ofdata_to_platdata,
582 .probe = pcie_dw_mvebu_probe,
583 .priv_auto_alloc_size = sizeof(struct pcie_dw_mvebu),