2 * Copyright (C) 2015 Marvell International Ltd.
7 * - drivers/pci/pcie_imx.c
8 * - drivers/pci/pci_mvebu.c
9 * - drivers/pci/pcie_xilinx.c
11 * SPDX-License-Identifier: GPL-2.0+
18 #include <asm-generic/gpio.h>
20 DECLARE_GLOBAL_DATA_PTR;
22 /* PCI Config space registers */
23 #define PCIE_CONFIG_BAR0 0x10
24 #define PCIE_LINK_STATUS_REG 0x80
25 #define PCIE_LINK_STATUS_SPEED_OFF 16
26 #define PCIE_LINK_STATUS_SPEED_MASK (0xf << PCIE_LINK_STATUS_SPEED_OFF)
27 #define PCIE_LINK_STATUS_WIDTH_OFF 20
28 #define PCIE_LINK_STATUS_WIDTH_MASK (0xf << PCIE_LINK_STATUS_WIDTH_OFF)
30 /* Resizable bar capability registers */
31 #define RESIZABLE_BAR_CAP 0x250
32 #define RESIZABLE_BAR_CTL0 0x254
33 #define RESIZABLE_BAR_CTL1 0x258
36 #define PCIE_ATU_VIEWPORT 0x900
37 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
38 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
39 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
40 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
41 #define PCIE_ATU_CR1 0x904
42 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
43 #define PCIE_ATU_TYPE_IO (0x2 << 0)
44 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
45 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
46 #define PCIE_ATU_CR2 0x908
47 #define PCIE_ATU_ENABLE (0x1 << 31)
48 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
49 #define PCIE_ATU_LOWER_BASE 0x90C
50 #define PCIE_ATU_UPPER_BASE 0x910
51 #define PCIE_ATU_LIMIT 0x914
52 #define PCIE_ATU_LOWER_TARGET 0x918
53 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
54 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
55 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
56 #define PCIE_ATU_UPPER_TARGET 0x91C
58 #define PCIE_LINK_CAPABILITY 0x7C
59 #define PCIE_LINK_CTL_2 0xA0
60 #define TARGET_LINK_SPEED_MASK 0xF
61 #define LINK_SPEED_GEN_1 0x1
62 #define LINK_SPEED_GEN_2 0x2
63 #define LINK_SPEED_GEN_3 0x3
65 #define PCIE_GEN3_RELATED 0x890
66 #define GEN3_EQU_DISABLE (1 << 16)
67 #define GEN3_ZRXDC_NON_COMP (1 << 0)
69 #define PCIE_GEN3_EQU_CTRL 0x8A8
70 #define GEN3_EQU_EVAL_2MS_DISABLE (1 << 5)
72 #define PCIE_ROOT_COMPLEX_MODE_MASK (0xF << 4)
74 #define PCIE_LINK_UP_TIMEOUT_MS 100
76 #define PCIE_GLOBAL_CONTROL 0x8000
77 #define PCIE_APP_LTSSM_EN (1 << 2)
78 #define PCIE_DEVICE_TYPE_OFFSET (4)
79 #define PCIE_DEVICE_TYPE_MASK (0xF)
80 #define PCIE_DEVICE_TYPE_EP (0x0) /* Endpoint */
81 #define PCIE_DEVICE_TYPE_LEP (0x1) /* Legacy endpoint */
82 #define PCIE_DEVICE_TYPE_RC (0x4) /* Root complex */
84 #define PCIE_GLOBAL_STATUS 0x8008
85 #define PCIE_GLB_STS_RDLH_LINK_UP (1 << 1)
86 #define PCIE_GLB_STS_PHY_LINK_UP (1 << 9)
88 #define PCIE_ARCACHE_TRC 0x8050
89 #define PCIE_AWCACHE_TRC 0x8054
90 #define ARCACHE_SHAREABLE_CACHEABLE 0x3511
91 #define AWCACHE_SHAREABLE_CACHEABLE 0x5311
93 #define LINK_SPEED_GEN_1 0x1
94 #define LINK_SPEED_GEN_2 0x2
95 #define LINK_SPEED_GEN_3 0x3
98 * struct pcie_dw_mvebu - MVEBU DW PCIe controller state
100 * @ctrl_base: The base address of the register space
101 * @cfg_base: The base address of the configuration space
102 * @cfg_size: The size of the configuration space which is needed
103 * as it gets written into the PCIE_ATU_LIMIT register
104 * @first_busno: This driver supports multiple PCIe controllers.
105 * first_busno stores the bus number of the PCIe root-port
106 * number which may vary depending on the PCIe setup
107 * (PEX switches etc).
109 struct pcie_dw_mvebu {
115 /* IO and MEM PCI regions */
116 struct pci_region io;
117 struct pci_region mem;
120 static int pcie_dw_get_link_speed(const void *regs_base)
122 return (readl(regs_base + PCIE_LINK_STATUS_REG) &
123 PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
126 static int pcie_dw_get_link_width(const void *regs_base)
128 return (readl(regs_base + PCIE_LINK_STATUS_REG) &
129 PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
133 * pcie_dw_prog_outbound_atu() - Configure ATU for outbound accesses
135 * @pcie: Pointer to the PCI controller state
136 * @index: ATU region index
137 * @type: ATU accsess type
138 * @cpu_addr: the physical address for the translation entry
139 * @pci_addr: the pcie bus address for the translation entry
140 * @size: the size of the translation entry
142 static void pcie_dw_prog_outbound_atu(struct pcie_dw_mvebu *pcie, int index,
143 int type, u64 cpu_addr, u64 pci_addr,
146 writel(PCIE_ATU_REGION_OUTBOUND | index,
147 pcie->ctrl_base + PCIE_ATU_VIEWPORT);
148 writel(lower_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_LOWER_BASE);
149 writel(upper_32_bits(cpu_addr), pcie->ctrl_base + PCIE_ATU_UPPER_BASE);
150 writel(lower_32_bits(cpu_addr + size - 1),
151 pcie->ctrl_base + PCIE_ATU_LIMIT);
152 writel(lower_32_bits(pci_addr),
153 pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
154 writel(upper_32_bits(pci_addr),
155 pcie->ctrl_base + PCIE_ATU_UPPER_TARGET);
156 writel(type, pcie->ctrl_base + PCIE_ATU_CR1);
157 writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2);
161 * set_cfg_address() - Configure the PCIe controller config space access
163 * @pcie: Pointer to the PCI controller state
164 * @d: PCI device to access
165 * @where: Offset in the configuration space
167 * Configures the PCIe controller to access the configuration space of
168 * a specific PCIe device and returns the address to use for this
171 * Return: Address that can be used to access the configation space
172 * of the requested device / offset
174 static uintptr_t set_cfg_address(struct pcie_dw_mvebu *pcie,
175 pci_dev_t d, uint where)
177 uintptr_t va_address;
181 * Region #0 is used for Outbound CFG space access.
182 * Direction = Outbound
186 if (PCI_BUS(d) == (pcie->first_busno + 1))
187 /* For local bus, change TLP Type field to 4. */
188 atu_type = PCIE_ATU_TYPE_CFG0;
190 /* Otherwise, change TLP Type field to 5. */
191 atu_type = PCIE_ATU_TYPE_CFG1;
193 if (PCI_BUS(d) == pcie->first_busno) {
194 /* Accessing root port configuration space. */
195 va_address = (uintptr_t)pcie->ctrl_base;
197 d = PCI_MASK_BUS(d) | (PCI_BUS(d) - pcie->first_busno);
198 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
199 atu_type, (u64)pcie->cfg_base,
200 d << 8, pcie->cfg_size);
201 va_address = (uintptr_t)pcie->cfg_base;
204 va_address += where & ~0x3;
210 * pcie_dw_addr_valid() - Check for valid bus address
212 * @d: The PCI device to access
213 * @first_busno: Bus number of the PCIe controller root complex
215 * Return 1 (true) if the PCI device can be accessed by this controller.
217 * Return: 1 on valid, 0 on invalid
219 static int pcie_dw_addr_valid(pci_dev_t d, int first_busno)
221 if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0))
223 if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0))
230 * pcie_dw_mvebu_read_config() - Read from configuration space
232 * @bus: Pointer to the PCI bus
233 * @bdf: Identifies the PCIe device to access
234 * @offset: The offset into the device's configuration space
235 * @valuep: A pointer at which to store the read value
236 * @size: Indicates the size of access to perform
238 * Read a value of size @size from offset @offset within the configuration
239 * space of the device identified by the bus, device & function numbers in @bdf
240 * on the PCI bus @bus.
242 * Return: 0 on success
244 static int pcie_dw_mvebu_read_config(struct udevice *bus, pci_dev_t bdf,
245 uint offset, ulong *valuep,
246 enum pci_size_t size)
248 struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
249 uintptr_t va_address;
252 debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
253 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
255 if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
256 debug("- out of range\n");
257 *valuep = pci_get_ff(size);
261 va_address = set_cfg_address(pcie, bdf, offset);
263 value = readl(va_address);
265 debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
266 *valuep = pci_conv_32_to_size(value, offset, size);
268 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
269 PCIE_ATU_TYPE_IO, pcie->io.phys_start,
270 pcie->io.bus_start, pcie->io.size);
276 * pcie_dw_mvebu_write_config() - Write to configuration space
278 * @bus: Pointer to the PCI bus
279 * @bdf: Identifies the PCIe device to access
280 * @offset: The offset into the device's configuration space
281 * @value: The value to write
282 * @size: Indicates the size of access to perform
284 * Write the value @value of size @size from offset @offset within the
285 * configuration space of the device identified by the bus, device & function
286 * numbers in @bdf on the PCI bus @bus.
288 * Return: 0 on success
290 static int pcie_dw_mvebu_write_config(struct udevice *bus, pci_dev_t bdf,
291 uint offset, ulong value,
292 enum pci_size_t size)
294 struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
295 uintptr_t va_address;
298 debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
299 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
300 debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
302 if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
303 debug("- out of range\n");
307 va_address = set_cfg_address(pcie, bdf, offset);
309 old = readl(va_address);
310 value = pci_conv_size_to_32(old, value, offset, size);
311 writel(value, va_address);
313 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0,
314 PCIE_ATU_TYPE_IO, pcie->io.phys_start,
315 pcie->io.bus_start, pcie->io.size);
321 * pcie_dw_configure() - Configure link capabilities and speed
323 * @regs_base: A pointer to the PCIe controller registers
324 * @cap_speed: The capabilities and speed to configure
326 * Configure the link capabilities and speed in the PCIe root complex.
328 static void pcie_dw_configure(const void *regs_base, u32 cap_speed)
332 * Need to read the serdes speed from the dts and according to it
333 * configure the PCIe gen
336 /* Set link to GEN 3 */
337 clrsetbits_le32(regs_base + PCIE_LINK_CTL_2,
338 TARGET_LINK_SPEED_MASK, cap_speed);
339 clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY,
340 TARGET_LINK_SPEED_MASK, cap_speed);
341 setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE);
345 * is_link_up() - Return the link state
347 * @regs_base: A pointer to the PCIe controller registers
349 * Return: 1 (true) for active line and 0 (false) for no link
351 static int is_link_up(const void *regs_base)
353 u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
356 reg = readl(regs_base + PCIE_GLOBAL_STATUS);
357 if ((reg & mask) == mask)
364 * wait_link_up() - Wait for the link to come up
366 * @regs_base: A pointer to the PCIe controller registers
368 * Return: 1 (true) for active line and 0 (false) for no link (timeout)
370 static int wait_link_up(const void *regs_base)
372 unsigned long timeout;
374 timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
375 while (!is_link_up(regs_base)) {
376 if (get_timer(0) > timeout)
384 * pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port
386 * @regs_base: A pointer to the PCIe controller registers
387 * @cap_speed: The capabilities and speed to configure
389 * Configure the PCIe controller root complex depending on the
390 * requested link capabilities and speed.
392 * Return: 1 (true) for active line and 0 (false) for no link
394 static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed)
396 if (!is_link_up(regs_base)) {
397 /* Disable LTSSM state machine to enable configuration */
398 clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
402 clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
403 PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET,
404 PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET);
406 /* Set the PCIe master AXI attributes */
407 writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC);
408 writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC);
410 /* DW pre link configurations */
411 pcie_dw_configure(regs_base, cap_speed);
413 if (!is_link_up(regs_base)) {
414 /* Configuration done. Start LTSSM */
415 setbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
419 /* Check that link was established */
420 if (!wait_link_up(regs_base))
424 * Link can be established in Gen 1. still need to wait
425 * till MAC nagaotiation is completed
433 * pcie_dw_set_host_bars() - Configure the host BARs
435 * @regs_base: A pointer to the PCIe controller registers
437 * Configure the host BARs of the PCIe controller root port so that
438 * PCI(e) devices may access the system memory.
440 static void pcie_dw_set_host_bars(const void *regs_base)
442 u32 size = gd->ram_size;
447 /* Verify the maximal BAR size */
448 reg = readl(regs_base + RESIZABLE_BAR_CAP);
449 max_size = 1ULL << (5 + (reg + (1 << 4)));
451 if (size > max_size) {
453 printf("Warning: PCIe BARs can't map all DRAM space\n");
456 /* Set the BAR base and size towards DDR */
457 bar0 = CONFIG_SYS_SDRAM_BASE & ~0xf;
458 bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32;
459 writel(CONFIG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0);
461 reg = ((size >> 20) - 1) << 12;
462 writel(size, regs_base + RESIZABLE_BAR_CTL0);
466 * pcie_dw_mvebu_probe() - Probe the PCIe bus for active link
468 * @dev: A pointer to the device being operated on
470 * Probe for an active link on the PCIe bus and configure the controller
471 * to enable this port.
473 * Return: 0 on success, else -ENODEV
475 static int pcie_dw_mvebu_probe(struct udevice *dev)
477 struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
478 struct udevice *ctlr = pci_get_controller(dev);
479 struct pci_controller *hose = dev_get_uclass_priv(ctlr);
480 #ifdef CONFIG_DM_GPIO
481 struct gpio_desc reset_gpio;
483 gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio,
486 * Issue reset to add-in card trough the dedicated GPIO.
487 * Some boards are connecting the card reset pin to common system
488 * reset wire and others are using separate GPIO port.
489 * In the last case we have to release a reset of the addon card
492 if (dm_gpio_is_valid(&reset_gpio)) {
493 dm_gpio_set_value(&reset_gpio, 1);
497 debug("PCIE Reset on GPIO support is missing\n");
498 #endif /* CONFIG_DM_GPIO */
500 pcie->first_busno = dev->seq;
502 /* Don't register host if link is down */
503 if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) {
504 printf("PCIE-%d: Link down\n", dev->seq);
506 printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev->seq,
507 pcie_dw_get_link_speed(pcie->ctrl_base),
508 pcie_dw_get_link_width(pcie->ctrl_base),
512 /* Store the IO and MEM windows settings for future use by the ATU */
513 pcie->io.phys_start = hose->regions[0].phys_start; /* IO base */
514 pcie->io.bus_start = hose->regions[0].bus_start; /* IO_bus_addr */
515 pcie->io.size = hose->regions[0].size; /* IO size */
517 pcie->mem.phys_start = hose->regions[1].phys_start; /* MEM base */
518 pcie->mem.bus_start = hose->regions[1].bus_start; /* MEM_bus_addr */
519 pcie->mem.size = hose->regions[1].size; /* MEM size */
521 pcie_dw_prog_outbound_atu(pcie, PCIE_ATU_REGION_INDEX1,
522 PCIE_ATU_TYPE_MEM, pcie->mem.phys_start,
523 pcie->mem.bus_start, pcie->mem.size);
525 /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
526 clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION,
527 0xffff << 16, PCI_CLASS_BRIDGE_PCI << 16);
529 pcie_dw_set_host_bars(pcie->ctrl_base);
535 * pcie_dw_mvebu_ofdata_to_platdata() - Translate from DT to device state
537 * @dev: A pointer to the device being operated on
539 * Translate relevant data from the device tree pertaining to device @dev into
540 * state that the driver will later make use of. This state is stored in the
541 * device's private data structure.
543 * Return: 0 on success, else -EINVAL
545 static int pcie_dw_mvebu_ofdata_to_platdata(struct udevice *dev)
547 struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
549 /* Get the controller base address */
550 pcie->ctrl_base = (void *)devfdt_get_addr_index(dev, 0);
551 if ((fdt_addr_t)pcie->ctrl_base == FDT_ADDR_T_NONE)
554 /* Get the config space base address and size */
555 pcie->cfg_base = (void *)devfdt_get_addr_size_index(dev, 1,
557 if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
563 static const struct dm_pci_ops pcie_dw_mvebu_ops = {
564 .read_config = pcie_dw_mvebu_read_config,
565 .write_config = pcie_dw_mvebu_write_config,
568 static const struct udevice_id pcie_dw_mvebu_ids[] = {
569 { .compatible = "marvell,armada8k-pcie" },
573 U_BOOT_DRIVER(pcie_dw_mvebu) = {
574 .name = "pcie_dw_mvebu",
576 .of_match = pcie_dw_mvebu_ids,
577 .ops = &pcie_dw_mvebu_ops,
578 .ofdata_to_platdata = pcie_dw_mvebu_ofdata_to_platdata,
579 .probe = pcie_dw_mvebu_probe,
580 .priv_auto_alloc_size = sizeof(struct pcie_dw_mvebu),