1 // SPDX-License-Identifier: GPL-2.0+
3 * Rockchip AXI PCIe host controller driver
5 * Copyright (c) 2016 Rockchip, Inc.
6 * Copyright (c) 2020 Amarula Solutions(India)
7 * Copyright (c) 2020 Jagan Teki <jagan@amarulasolutions.com>
8 * Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
9 * Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
11 * Bits taken from Linux Rockchip PCIe host controller.
16 #include <dm/device_compat.h>
17 #include <generic-phy.h>
19 #include <power/regulator.h>
21 #include <asm-generic/gpio.h>
22 #include <linux/iopoll.h>
24 #define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val))
25 #define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
27 #define ENCODE_LANES(x) ((((x) >> 1) & 3) << 4)
28 #define PCIE_CLIENT_BASE 0x0
29 #define PCIE_CLIENT_CONFIG (PCIE_CLIENT_BASE + 0x00)
30 #define PCIE_CLIENT_CONF_ENABLE HIWORD_UPDATE_BIT(0x0001)
31 #define PCIE_CLIENT_LINK_TRAIN_ENABLE HIWORD_UPDATE_BIT(0x0002)
32 #define PCIE_CLIENT_MODE_RC HIWORD_UPDATE_BIT(0x0040)
33 #define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0)
34 #define PCIE_CLIENT_BASIC_STATUS1 0x0048
35 #define PCIE_CLIENT_LINK_STATUS_UP GENMASK(21, 20)
36 #define PCIE_CLIENT_LINK_STATUS_MASK GENMASK(21, 20)
37 #define PCIE_LINK_UP(x) \
38 (((x) & PCIE_CLIENT_LINK_STATUS_MASK) == PCIE_CLIENT_LINK_STATUS_UP)
39 #define PCIE_RC_NORMAL_BASE 0x800000
40 #define PCIE_LM_BASE 0x900000
41 #define PCIE_LM_VENDOR_ID (PCIE_LM_BASE + 0x44)
42 #define PCIE_LM_VENDOR_ROCKCHIP 0x1d87
43 #define PCIE_LM_RCBAR (PCIE_LM_BASE + 0x300)
44 #define PCIE_LM_RCBARPIE BIT(19)
45 #define PCIE_LM_RCBARPIS BIT(20)
46 #define PCIE_RC_BASE 0xa00000
47 #define PCIE_RC_CONFIG_DCR (PCIE_RC_BASE + 0x0c4)
48 #define PCIE_RC_CONFIG_DCR_CSPL_SHIFT 18
49 #define PCIE_RC_CONFIG_DCR_CPLS_SHIFT 26
50 #define PCIE_RC_PCIE_LCAP (PCIE_RC_BASE + 0x0cc)
51 #define PCIE_RC_PCIE_LCAP_APMS_L0S BIT(10)
52 #define PCIE_ATR_BASE 0xc00000
53 #define PCIE_ATR_OB_ADDR0(i) (PCIE_ATR_BASE + 0x000 + (i) * 0x20)
54 #define PCIE_ATR_OB_ADDR1(i) (PCIE_ATR_BASE + 0x004 + (i) * 0x20)
55 #define PCIE_ATR_OB_DESC0(i) (PCIE_ATR_BASE + 0x008 + (i) * 0x20)
56 #define PCIE_ATR_OB_DESC1(i) (PCIE_ATR_BASE + 0x00c + (i) * 0x20)
57 #define PCIE_ATR_IB_ADDR0(i) (PCIE_ATR_BASE + 0x800 + (i) * 0x8)
58 #define PCIE_ATR_IB_ADDR1(i) (PCIE_ATR_BASE + 0x804 + (i) * 0x8)
59 #define PCIE_ATR_HDR_MEM 0x2
60 #define PCIE_ATR_HDR_IO 0x6
61 #define PCIE_ATR_HDR_CFG_TYPE0 0xa
62 #define PCIE_ATR_HDR_CFG_TYPE1 0xb
63 #define PCIE_ATR_HDR_RID BIT(23)
65 #define PCIE_ATR_OB_REGION0_SIZE (32 * 1024 * 1024)
66 #define PCIE_ATR_OB_REGION_SIZE (1 * 1024 * 1024)
68 struct rockchip_pcie {
75 struct reset_ctl core_rst;
76 struct reset_ctl mgmt_rst;
77 struct reset_ctl mgmt_sticky_rst;
78 struct reset_ctl pipe_rst;
79 struct reset_ctl pm_rst;
80 struct reset_ctl pclk_rst;
81 struct reset_ctl aclk_rst;
84 struct gpio_desc ep_gpio;
86 /* vpcie regulators */
87 struct udevice *vpcie12v;
88 struct udevice *vpcie3v3;
89 struct udevice *vpcie1v8;
90 struct udevice *vpcie0v9;
96 static int rockchip_pcie_rd_conf(const struct udevice *udev, pci_dev_t bdf,
97 uint offset, ulong *valuep,
100 struct rockchip_pcie *priv = dev_get_priv(udev);
101 unsigned int bus = PCI_BUS(bdf);
102 unsigned int dev = PCI_DEV(bdf);
103 int where = PCIE_ECAM_OFFSET(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset & ~0x3);
106 if (bus == priv->first_busno && dev == 0) {
107 value = readl(priv->apb_base + PCIE_RC_NORMAL_BASE + where);
108 *valuep = pci_conv_32_to_size(value, offset, size);
112 if ((bus == priv->first_busno + 1) && dev == 0) {
113 value = readl(priv->axi_base + where);
114 *valuep = pci_conv_32_to_size(value, offset, size);
118 *valuep = pci_get_ff(size);
123 static int rockchip_pcie_wr_conf(struct udevice *udev, pci_dev_t bdf,
124 uint offset, ulong value,
125 enum pci_size_t size)
127 struct rockchip_pcie *priv = dev_get_priv(udev);
128 unsigned int bus = PCI_BUS(bdf);
129 unsigned int dev = PCI_DEV(bdf);
130 int where = PCIE_ECAM_OFFSET(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset & ~0x3);
133 if (bus == priv->first_busno && dev == 0) {
134 old = readl(priv->apb_base + PCIE_RC_NORMAL_BASE + where);
135 value = pci_conv_size_to_32(old, value, offset, size);
136 writel(value, priv->apb_base + PCIE_RC_NORMAL_BASE + where);
140 if ((bus == priv->first_busno + 1) && dev == 0) {
141 old = readl(priv->axi_base + where);
142 value = pci_conv_size_to_32(old, value, offset, size);
143 writel(value, priv->axi_base + where);
150 static int rockchip_pcie_atr_init(struct rockchip_pcie *priv)
152 struct udevice *ctlr = pci_get_controller(priv->dev);
153 struct pci_controller *hose = dev_get_uclass_priv(ctlr);
154 u64 addr, size, offset;
158 /* Use region 0 to map PCI configuration space. */
159 writel(25 - 1, priv->apb_base + PCIE_ATR_OB_ADDR0(0));
160 writel(0, priv->apb_base + PCIE_ATR_OB_ADDR1(0));
161 writel(PCIE_ATR_HDR_CFG_TYPE0 | PCIE_ATR_HDR_RID,
162 priv->apb_base + PCIE_ATR_OB_DESC0(0));
163 writel(0, priv->apb_base + PCIE_ATR_OB_DESC1(0));
165 for (i = 0; i < hose->region_count; i++) {
166 if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
169 if (hose->regions[i].flags == PCI_REGION_IO)
170 type = PCIE_ATR_HDR_IO;
172 type = PCIE_ATR_HDR_MEM;
174 /* Only support identity mappings. */
175 if (hose->regions[i].bus_start !=
176 hose->regions[i].phys_start)
179 /* Only support mappings aligned on a region boundary. */
180 addr = hose->regions[i].bus_start;
181 if (addr & (PCIE_ATR_OB_REGION_SIZE - 1))
184 /* Mappings should lie between AXI and APB regions. */
185 size = hose->regions[i].size;
186 if (addr < (u64)priv->axi_base + PCIE_ATR_OB_REGION0_SIZE)
188 if (addr + size > (u64)priv->apb_base)
191 offset = addr - (u64)priv->axi_base - PCIE_ATR_OB_REGION0_SIZE;
192 region = 1 + (offset / PCIE_ATR_OB_REGION_SIZE);
195 priv->apb_base + PCIE_ATR_OB_ADDR0(region));
196 writel(0, priv->apb_base + PCIE_ATR_OB_ADDR1(region));
197 writel(type | PCIE_ATR_HDR_RID,
198 priv->apb_base + PCIE_ATR_OB_DESC0(region));
199 writel(0, priv->apb_base + PCIE_ATR_OB_DESC1(region));
201 addr += PCIE_ATR_OB_REGION_SIZE;
202 size -= PCIE_ATR_OB_REGION_SIZE;
207 /* Passthrough inbound translations unmodified. */
208 writel(32 - 1, priv->apb_base + PCIE_ATR_IB_ADDR0(2));
209 writel(0, priv->apb_base + PCIE_ATR_IB_ADDR1(2));
214 static int rockchip_pcie_init_port(struct udevice *dev)
216 struct rockchip_pcie *priv = dev_get_priv(dev);
220 if (dm_gpio_is_valid(&priv->ep_gpio))
221 dm_gpio_set_value(&priv->ep_gpio, 0);
223 ret = reset_assert(&priv->aclk_rst);
225 dev_err(dev, "failed to assert aclk reset (ret=%d)\n", ret);
229 ret = reset_assert(&priv->pclk_rst);
231 dev_err(dev, "failed to assert pclk reset (ret=%d)\n", ret);
235 ret = reset_assert(&priv->pm_rst);
237 dev_err(dev, "failed to assert pm reset (ret=%d)\n", ret);
241 ret = generic_phy_init(&priv->pcie_phy);
243 dev_err(dev, "failed to init phy (ret=%d)\n", ret);
247 ret = reset_assert(&priv->core_rst);
249 dev_err(dev, "failed to assert core reset (ret=%d)\n", ret);
253 ret = reset_assert(&priv->mgmt_rst);
255 dev_err(dev, "failed to assert mgmt reset (ret=%d)\n", ret);
259 ret = reset_assert(&priv->mgmt_sticky_rst);
261 dev_err(dev, "failed to assert mgmt-sticky reset (ret=%d)\n",
266 ret = reset_assert(&priv->pipe_rst);
268 dev_err(dev, "failed to assert pipe reset (ret=%d)\n", ret);
274 ret = reset_deassert(&priv->pm_rst);
276 dev_err(dev, "failed to deassert pm reset (ret=%d)\n", ret);
280 ret = reset_deassert(&priv->aclk_rst);
282 dev_err(dev, "failed to deassert aclk reset (ret=%d)\n", ret);
286 ret = reset_deassert(&priv->pclk_rst);
288 dev_err(dev, "failed to deassert pclk reset (ret=%d)\n", ret);
292 /* Select GEN1 for now */
293 cr = PCIE_CLIENT_GEN_SEL_1;
294 /* Set Root complex mode */
295 cr |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
296 writel(cr, priv->apb_base + PCIE_CLIENT_CONFIG);
298 ret = generic_phy_power_on(&priv->pcie_phy);
300 dev_err(dev, "failed to power on phy (ret=%d)\n", ret);
301 goto err_power_off_phy;
304 ret = reset_deassert(&priv->mgmt_sticky_rst);
306 dev_err(dev, "failed to deassert mgmt-sticky reset (ret=%d)\n",
308 goto err_power_off_phy;
311 ret = reset_deassert(&priv->core_rst);
313 dev_err(dev, "failed to deassert core reset (ret=%d)\n", ret);
314 goto err_power_off_phy;
317 ret = reset_deassert(&priv->mgmt_rst);
319 dev_err(dev, "failed to deassert mgmt reset (ret=%d)\n", ret);
320 goto err_power_off_phy;
323 ret = reset_deassert(&priv->pipe_rst);
325 dev_err(dev, "failed to deassert pipe reset (ret=%d)\n", ret);
326 goto err_power_off_phy;
329 /* Enable Gen1 training */
330 writel(PCIE_CLIENT_LINK_TRAIN_ENABLE,
331 priv->apb_base + PCIE_CLIENT_CONFIG);
333 if (dm_gpio_is_valid(&priv->ep_gpio))
334 dm_gpio_set_value(&priv->ep_gpio, 1);
336 ret = readl_poll_sleep_timeout
337 (priv->apb_base + PCIE_CLIENT_BASIC_STATUS1,
338 status, PCIE_LINK_UP(status), 20, 500 * 1000);
340 dev_err(dev, "PCIe link training gen1 timeout!\n");
341 goto err_power_off_phy;
344 /* Initialize Root Complex registers. */
345 writel(PCIE_LM_VENDOR_ROCKCHIP, priv->apb_base + PCIE_LM_VENDOR_ID);
346 writel(PCI_CLASS_BRIDGE_PCI_NORMAL << 8,
347 priv->apb_base + PCIE_RC_BASE + PCI_CLASS_REVISION);
348 writel(PCIE_LM_RCBARPIE | PCIE_LM_RCBARPIS,
349 priv->apb_base + PCIE_LM_RCBAR);
351 if (dev_read_bool(dev, "aspm-no-l0s")) {
352 val = readl(priv->apb_base + PCIE_RC_PCIE_LCAP);
353 val &= ~PCIE_RC_PCIE_LCAP_APMS_L0S;
354 writel(val, priv->apb_base + PCIE_RC_PCIE_LCAP);
357 /* Configure Address Translation. */
358 ret = rockchip_pcie_atr_init(priv);
360 dev_err(dev, "PCIE-%d: ATR init failed\n", dev_seq(dev));
361 goto err_power_off_phy;
367 generic_phy_power_off(&priv->pcie_phy);
369 generic_phy_exit(&priv->pcie_phy);
373 static int rockchip_pcie_set_vpcie(struct udevice *dev)
375 struct rockchip_pcie *priv = dev_get_priv(dev);
378 ret = regulator_set_enable_if_allowed(priv->vpcie12v, true);
379 if (ret && ret != -ENOSYS) {
380 dev_err(dev, "failed to enable vpcie12v (ret=%d)\n", ret);
384 ret = regulator_set_enable_if_allowed(priv->vpcie3v3, true);
385 if (ret && ret != -ENOSYS) {
386 dev_err(dev, "failed to enable vpcie3v3 (ret=%d)\n", ret);
387 goto err_disable_12v;
390 ret = regulator_set_enable_if_allowed(priv->vpcie1v8, true);
391 if (ret && ret != -ENOSYS) {
392 dev_err(dev, "failed to enable vpcie1v8 (ret=%d)\n", ret);
393 goto err_disable_3v3;
396 ret = regulator_set_enable_if_allowed(priv->vpcie0v9, true);
397 if (ret && ret != -ENOSYS) {
398 dev_err(dev, "failed to enable vpcie0v9 (ret=%d)\n", ret);
399 goto err_disable_1v8;
405 regulator_set_enable_if_allowed(priv->vpcie1v8, false);
407 regulator_set_enable_if_allowed(priv->vpcie3v3, false);
409 regulator_set_enable_if_allowed(priv->vpcie12v, false);
413 static int rockchip_pcie_parse_dt(struct udevice *dev)
415 struct rockchip_pcie *priv = dev_get_priv(dev);
418 priv->axi_base = dev_read_addr_name(dev, "axi-base");
419 if (priv->axi_base == FDT_ADDR_T_NONE)
422 priv->apb_base = dev_read_addr_name(dev, "apb-base");
423 if (priv->apb_base == FDT_ADDR_T_NONE)
426 ret = reset_get_by_name(dev, "core", &priv->core_rst);
428 dev_err(dev, "failed to get core reset (ret=%d)\n", ret);
432 ret = reset_get_by_name(dev, "mgmt", &priv->mgmt_rst);
434 dev_err(dev, "failed to get mgmt reset (ret=%d)\n", ret);
438 ret = reset_get_by_name(dev, "mgmt-sticky", &priv->mgmt_sticky_rst);
440 dev_err(dev, "failed to get mgmt-sticky reset (ret=%d)\n", ret);
444 ret = reset_get_by_name(dev, "pipe", &priv->pipe_rst);
446 dev_err(dev, "failed to get pipe reset (ret=%d)\n", ret);
450 ret = reset_get_by_name(dev, "pm", &priv->pm_rst);
452 dev_err(dev, "failed to get pm reset (ret=%d)\n", ret);
456 ret = reset_get_by_name(dev, "pclk", &priv->pclk_rst);
458 dev_err(dev, "failed to get pclk reset (ret=%d)\n", ret);
462 ret = reset_get_by_name(dev, "aclk", &priv->aclk_rst);
464 dev_err(dev, "failed to get aclk reset (ret=%d)\n", ret);
468 ret = device_get_supply_regulator(dev, "vpcie12v-supply",
470 if (ret && ret != -ENOENT) {
471 dev_err(dev, "failed to get vpcie12v supply (ret=%d)\n", ret);
475 ret = device_get_supply_regulator(dev, "vpcie3v3-supply",
477 if (ret && ret != -ENOENT) {
478 dev_err(dev, "failed to get vpcie3v3 supply (ret=%d)\n", ret);
482 ret = device_get_supply_regulator(dev, "vpcie1v8-supply",
484 if (ret && ret != -ENOENT) {
485 dev_err(dev, "failed to get vpcie1v8 supply (ret=%d)\n", ret);
489 ret = device_get_supply_regulator(dev, "vpcie0v9-supply",
491 if (ret && ret != -ENOENT) {
492 dev_err(dev, "failed to get vpcie0v9 supply (ret=%d)\n", ret);
496 ret = generic_phy_get_by_index(dev, 0, &priv->pcie_phy);
498 dev_err(dev, "failed to get pcie-phy (ret=%d)\n", ret);
502 ret = gpio_request_by_name(dev, "ep-gpios", 0,
503 &priv->ep_gpio, GPIOD_IS_OUT);
505 dev_err(dev, "failed to find ep-gpios property\n");
512 static int rockchip_pcie_probe(struct udevice *dev)
514 struct rockchip_pcie *priv = dev_get_priv(dev);
515 struct udevice *ctlr = pci_get_controller(dev);
516 struct pci_controller *hose = dev_get_uclass_priv(ctlr);
519 priv->first_busno = dev_seq(dev);
522 ret = rockchip_pcie_parse_dt(dev);
526 ret = rockchip_pcie_set_vpcie(dev);
530 ret = rockchip_pcie_init_port(dev);
532 goto err_disable_vpcie;
534 dev_info(dev, "PCIE-%d: Link up (Bus%d)\n",
535 dev_seq(dev), hose->first_busno);
540 regulator_set_enable_if_allowed(priv->vpcie0v9, false);
541 regulator_set_enable_if_allowed(priv->vpcie1v8, false);
542 regulator_set_enable_if_allowed(priv->vpcie3v3, false);
543 regulator_set_enable_if_allowed(priv->vpcie12v, false);
545 if (dm_gpio_is_valid(&priv->ep_gpio))
546 dm_gpio_free(dev, &priv->ep_gpio);
550 static const struct dm_pci_ops rockchip_pcie_ops = {
551 .read_config = rockchip_pcie_rd_conf,
552 .write_config = rockchip_pcie_wr_conf,
555 static const struct udevice_id rockchip_pcie_ids[] = {
556 { .compatible = "rockchip,rk3399-pcie" },
560 U_BOOT_DRIVER(rockchip_pcie) = {
561 .name = "rockchip_pcie",
563 .of_match = rockchip_pcie_ids,
564 .ops = &rockchip_pcie_ops,
565 .probe = rockchip_pcie_probe,
566 .priv_auto = sizeof(struct rockchip_pcie),