1 // SPDX-License-Identifier: GPL-2.0+
3 * PCIe host controller driver for Tegra194 SoC
5 * Copyright (C) 2019 NVIDIA Corporation.
7 * Author: Vidya Sagar <vidyas@nvidia.com>
10 #include <linux/clk.h>
11 #include <linux/debugfs.h>
12 #include <linux/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/interrupt.h>
16 #include <linux/iopoll.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
20 #include <linux/of_device.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_pci.h>
24 #include <linux/pci.h>
25 #include <linux/phy/phy.h>
26 #include <linux/pinctrl/consumer.h>
27 #include <linux/platform_device.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/random.h>
30 #include <linux/reset.h>
31 #include <linux/resource.h>
32 #include <linux/types.h>
33 #include "pcie-designware.h"
34 #include <soc/tegra/bpmp.h>
35 #include <soc/tegra/bpmp-abi.h>
36 #include "../../pci.h"
38 #define APPL_PINMUX 0x0
39 #define APPL_PINMUX_PEX_RST BIT(0)
40 #define APPL_PINMUX_CLKREQ_OVERRIDE_EN BIT(2)
41 #define APPL_PINMUX_CLKREQ_OVERRIDE BIT(3)
42 #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN BIT(4)
43 #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE BIT(5)
46 #define APPL_CTRL_SYS_PRE_DET_STATE BIT(6)
47 #define APPL_CTRL_LTSSM_EN BIT(7)
48 #define APPL_CTRL_HW_HOT_RST_EN BIT(20)
49 #define APPL_CTRL_HW_HOT_RST_MODE_MASK GENMASK(1, 0)
50 #define APPL_CTRL_HW_HOT_RST_MODE_SHIFT 22
51 #define APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST 0x1
53 #define APPL_INTR_EN_L0_0 0x8
54 #define APPL_INTR_EN_L0_0_LINK_STATE_INT_EN BIT(0)
55 #define APPL_INTR_EN_L0_0_MSI_RCV_INT_EN BIT(4)
56 #define APPL_INTR_EN_L0_0_INT_INT_EN BIT(8)
57 #define APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN BIT(15)
58 #define APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN BIT(19)
59 #define APPL_INTR_EN_L0_0_SYS_INTR_EN BIT(30)
60 #define APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN BIT(31)
62 #define APPL_INTR_STATUS_L0 0xC
63 #define APPL_INTR_STATUS_L0_LINK_STATE_INT BIT(0)
64 #define APPL_INTR_STATUS_L0_INT_INT BIT(8)
65 #define APPL_INTR_STATUS_L0_PCI_CMD_EN_INT BIT(15)
66 #define APPL_INTR_STATUS_L0_PEX_RST_INT BIT(16)
67 #define APPL_INTR_STATUS_L0_CDM_REG_CHK_INT BIT(18)
69 #define APPL_INTR_EN_L1_0_0 0x1C
70 #define APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN BIT(1)
71 #define APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN BIT(3)
72 #define APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN BIT(30)
74 #define APPL_INTR_STATUS_L1_0_0 0x20
75 #define APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED BIT(1)
76 #define APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED BIT(3)
77 #define APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE BIT(30)
79 #define APPL_INTR_STATUS_L1_1 0x2C
80 #define APPL_INTR_STATUS_L1_2 0x30
81 #define APPL_INTR_STATUS_L1_3 0x34
82 #define APPL_INTR_STATUS_L1_6 0x3C
83 #define APPL_INTR_STATUS_L1_7 0x40
84 #define APPL_INTR_STATUS_L1_15_CFG_BME_CHGED BIT(1)
86 #define APPL_INTR_EN_L1_8_0 0x44
87 #define APPL_INTR_EN_L1_8_BW_MGT_INT_EN BIT(2)
88 #define APPL_INTR_EN_L1_8_AUTO_BW_INT_EN BIT(3)
89 #define APPL_INTR_EN_L1_8_INTX_EN BIT(11)
90 #define APPL_INTR_EN_L1_8_AER_INT_EN BIT(15)
92 #define APPL_INTR_STATUS_L1_8_0 0x4C
93 #define APPL_INTR_STATUS_L1_8_0_EDMA_INT_MASK GENMASK(11, 6)
94 #define APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS BIT(2)
95 #define APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS BIT(3)
97 #define APPL_INTR_STATUS_L1_9 0x54
98 #define APPL_INTR_STATUS_L1_10 0x58
99 #define APPL_INTR_STATUS_L1_11 0x64
100 #define APPL_INTR_STATUS_L1_13 0x74
101 #define APPL_INTR_STATUS_L1_14 0x78
102 #define APPL_INTR_STATUS_L1_15 0x7C
103 #define APPL_INTR_STATUS_L1_17 0x88
105 #define APPL_INTR_EN_L1_18 0x90
106 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMPLT BIT(2)
107 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR BIT(1)
108 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0)
110 #define APPL_INTR_STATUS_L1_18 0x94
111 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT BIT(2)
112 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR BIT(1)
113 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0)
115 #define APPL_MSI_CTRL_1 0xAC
117 #define APPL_MSI_CTRL_2 0xB0
119 #define APPL_LEGACY_INTX 0xB8
121 #define APPL_LTR_MSG_1 0xC4
122 #define LTR_MSG_REQ BIT(15)
123 #define LTR_MST_NO_SNOOP_SHIFT 16
125 #define APPL_LTR_MSG_2 0xC8
126 #define APPL_LTR_MSG_2_LTR_MSG_REQ_STATE BIT(3)
128 #define APPL_LINK_STATUS 0xCC
129 #define APPL_LINK_STATUS_RDLH_LINK_UP BIT(0)
131 #define APPL_DEBUG 0xD0
132 #define APPL_DEBUG_PM_LINKST_IN_L2_LAT BIT(21)
133 #define APPL_DEBUG_PM_LINKST_IN_L0 0x11
134 #define APPL_DEBUG_LTSSM_STATE_MASK GENMASK(8, 3)
135 #define APPL_DEBUG_LTSSM_STATE_SHIFT 3
136 #define LTSSM_STATE_PRE_DETECT 5
138 #define APPL_RADM_STATUS 0xE4
139 #define APPL_PM_XMT_TURNOFF_STATE BIT(0)
141 #define APPL_DM_TYPE 0x100
142 #define APPL_DM_TYPE_MASK GENMASK(3, 0)
143 #define APPL_DM_TYPE_RP 0x4
144 #define APPL_DM_TYPE_EP 0x0
146 #define APPL_CFG_BASE_ADDR 0x104
147 #define APPL_CFG_BASE_ADDR_MASK GENMASK(31, 12)
149 #define APPL_CFG_IATU_DMA_BASE_ADDR 0x108
150 #define APPL_CFG_IATU_DMA_BASE_ADDR_MASK GENMASK(31, 18)
152 #define APPL_CFG_MISC 0x110
153 #define APPL_CFG_MISC_SLV_EP_MODE BIT(14)
154 #define APPL_CFG_MISC_ARCACHE_MASK GENMASK(13, 10)
155 #define APPL_CFG_MISC_ARCACHE_SHIFT 10
156 #define APPL_CFG_MISC_ARCACHE_VAL 3
158 #define APPL_CFG_SLCG_OVERRIDE 0x114
159 #define APPL_CFG_SLCG_OVERRIDE_SLCG_EN_MASTER BIT(0)
161 #define APPL_CAR_RESET_OVRD 0x12C
162 #define APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N BIT(0)
164 #define IO_BASE_IO_DECODE BIT(0)
165 #define IO_BASE_IO_DECODE_BIT8 BIT(8)
167 #define CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE BIT(0)
168 #define CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE BIT(16)
170 #define CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF 0x718
171 #define CFG_TIMER_CTRL_ACK_NAK_SHIFT (19)
173 #define EVENT_COUNTER_ALL_CLEAR 0x3
174 #define EVENT_COUNTER_ENABLE_ALL 0x7
175 #define EVENT_COUNTER_ENABLE_SHIFT 2
176 #define EVENT_COUNTER_EVENT_SEL_MASK GENMASK(7, 0)
177 #define EVENT_COUNTER_EVENT_SEL_SHIFT 16
178 #define EVENT_COUNTER_EVENT_Tx_L0S 0x2
179 #define EVENT_COUNTER_EVENT_Rx_L0S 0x3
180 #define EVENT_COUNTER_EVENT_L1 0x5
181 #define EVENT_COUNTER_EVENT_L1_1 0x7
182 #define EVENT_COUNTER_EVENT_L1_2 0x8
183 #define EVENT_COUNTER_GROUP_SEL_SHIFT 24
184 #define EVENT_COUNTER_GROUP_5 0x5
189 #define PORT_LOGIC_MSI_CTRL_INT_0_EN 0x828
191 #define GEN3_EQ_CONTROL_OFF 0x8a8
192 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT 8
193 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK GENMASK(23, 8)
194 #define GEN3_EQ_CONTROL_OFF_FB_MODE_MASK GENMASK(3, 0)
196 #define GEN3_RELATED_OFF 0x890
197 #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0)
198 #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16)
199 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24
200 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24)
202 #define PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT 0x8D0
203 #define AMBA_ERROR_RESPONSE_CRS_SHIFT 3
204 #define AMBA_ERROR_RESPONSE_CRS_MASK GENMASK(1, 0)
205 #define AMBA_ERROR_RESPONSE_CRS_OKAY 0
206 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFFFFFF 1
207 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 2
209 #define MSIX_ADDR_MATCH_LOW_OFF 0x940
210 #define MSIX_ADDR_MATCH_LOW_OFF_EN BIT(0)
211 #define MSIX_ADDR_MATCH_LOW_OFF_MASK GENMASK(31, 2)
213 #define MSIX_ADDR_MATCH_HIGH_OFF 0x944
214 #define MSIX_ADDR_MATCH_HIGH_OFF_MASK GENMASK(31, 0)
216 #define PORT_LOGIC_MSIX_DOORBELL 0x948
218 #define CAP_SPCIE_CAP_OFF 0x154
219 #define CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK GENMASK(3, 0)
220 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK GENMASK(11, 8)
221 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT 8
223 #define PME_ACK_TIMEOUT 10000
225 #define LTSSM_TIMEOUT 50000 /* 50ms */
227 #define GEN3_GEN4_EQ_PRESET_INIT 5
229 #define GEN1_CORE_CLK_FREQ 62500000
230 #define GEN2_CORE_CLK_FREQ 125000000
231 #define GEN3_CORE_CLK_FREQ 250000000
232 #define GEN4_CORE_CLK_FREQ 500000000
234 #define LTR_MSG_TIMEOUT (100 * 1000)
236 #define PERST_DEBOUNCE_TIME (5 * 1000)
238 #define EP_STATE_DISABLED 0
239 #define EP_STATE_ENABLED 1
241 static const unsigned int pcie_gen_freq[] = {
248 struct tegra_pcie_dw {
250 struct resource *appl_res;
251 struct resource *dbi_res;
252 struct resource *atu_dma_res;
253 void __iomem *appl_base;
254 struct clk *core_clk;
255 struct reset_control *core_apb_rst;
256 struct reset_control *core_rst;
258 struct tegra_bpmp *bpmp;
260 enum dw_pcie_device_mode mode;
262 bool supports_clkreq;
263 bool enable_cdm_check;
265 bool update_fc_fixup;
270 u32 cfg_link_cap_l1sub;
274 u32 aspm_l0s_enter_lat;
276 struct regulator *pex_ctl_supply;
277 struct regulator *slot_ctl_3v3;
278 struct regulator *slot_ctl_12v;
280 unsigned int phy_count;
283 struct dentry *debugfs;
285 /* Endpoint mode specific */
286 struct gpio_desc *pex_rst_gpiod;
287 struct gpio_desc *pex_refclk_sel_gpiod;
288 unsigned int pex_rst_irq;
292 struct tegra_pcie_dw_of_data {
293 enum dw_pcie_device_mode mode;
296 static inline struct tegra_pcie_dw *to_tegra_pcie(struct dw_pcie *pci)
298 return container_of(pci, struct tegra_pcie_dw, pci);
301 static inline void appl_writel(struct tegra_pcie_dw *pcie, const u32 value,
304 writel_relaxed(value, pcie->appl_base + reg);
307 static inline u32 appl_readl(struct tegra_pcie_dw *pcie, const u32 reg)
309 return readl_relaxed(pcie->appl_base + reg);
312 struct tegra_pcie_soc {
313 enum dw_pcie_device_mode mode;
316 static void apply_bad_link_workaround(struct pcie_port *pp)
318 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
319 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
320 u32 current_link_width;
324 * NOTE:- Since this scenario is uncommon and link as such is not
325 * stable anyway, not waiting to confirm if link is really
326 * transitioning to Gen-2 speed
328 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA);
329 if (val & PCI_EXP_LNKSTA_LBMS) {
330 current_link_width = (val & PCI_EXP_LNKSTA_NLW) >>
331 PCI_EXP_LNKSTA_NLW_SHIFT;
332 if (pcie->init_link_width > current_link_width) {
333 dev_warn(pci->dev, "PCIe link is bad, width reduced\n");
334 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base +
336 val &= ~PCI_EXP_LNKCTL2_TLS;
337 val |= PCI_EXP_LNKCTL2_TLS_2_5GT;
338 dw_pcie_writew_dbi(pci, pcie->pcie_cap_base +
339 PCI_EXP_LNKCTL2, val);
341 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base +
343 val |= PCI_EXP_LNKCTL_RL;
344 dw_pcie_writew_dbi(pci, pcie->pcie_cap_base +
345 PCI_EXP_LNKCTL, val);
350 static irqreturn_t tegra_pcie_rp_irq_handler(int irq, void *arg)
352 struct tegra_pcie_dw *pcie = arg;
353 struct dw_pcie *pci = &pcie->pci;
354 struct pcie_port *pp = &pci->pp;
358 val = appl_readl(pcie, APPL_INTR_STATUS_L0);
359 if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) {
360 val = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0);
361 if (val & APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED) {
362 appl_writel(pcie, val, APPL_INTR_STATUS_L1_0_0);
364 /* SBR & Surprise Link Down WAR */
365 val = appl_readl(pcie, APPL_CAR_RESET_OVRD);
366 val &= ~APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N;
367 appl_writel(pcie, val, APPL_CAR_RESET_OVRD);
369 val = appl_readl(pcie, APPL_CAR_RESET_OVRD);
370 val |= APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N;
371 appl_writel(pcie, val, APPL_CAR_RESET_OVRD);
373 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
374 val |= PORT_LOGIC_SPEED_CHANGE;
375 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
379 if (val & APPL_INTR_STATUS_L0_INT_INT) {
380 val = appl_readl(pcie, APPL_INTR_STATUS_L1_8_0);
381 if (val & APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS) {
383 APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS,
384 APPL_INTR_STATUS_L1_8_0);
385 apply_bad_link_workaround(pp);
387 if (val & APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS) {
389 APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS,
390 APPL_INTR_STATUS_L1_8_0);
392 val_w = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base +
394 dev_dbg(pci->dev, "Link Speed : Gen-%u\n", val_w &
399 val = appl_readl(pcie, APPL_INTR_STATUS_L0);
400 if (val & APPL_INTR_STATUS_L0_CDM_REG_CHK_INT) {
401 val = appl_readl(pcie, APPL_INTR_STATUS_L1_18);
402 tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
403 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT) {
404 dev_info(pci->dev, "CDM check complete\n");
405 tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPLETE;
407 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR) {
408 dev_err(pci->dev, "CDM comparison mismatch\n");
409 tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPARISON_ERROR;
411 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR) {
412 dev_err(pci->dev, "CDM Logic error\n");
413 tmp |= PCIE_PL_CHK_REG_CHK_REG_LOGIC_ERROR;
415 dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, tmp);
416 tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_ERR_ADDR);
417 dev_err(pci->dev, "CDM Error Address Offset = 0x%08X\n", tmp);
423 static void pex_ep_event_hot_rst_done(struct tegra_pcie_dw *pcie)
427 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0);
428 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0);
429 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1);
430 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2);
431 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3);
432 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6);
433 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7);
434 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0);
435 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9);
436 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10);
437 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11);
438 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13);
439 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14);
440 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15);
441 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17);
442 appl_writel(pcie, 0xFFFFFFFF, APPL_MSI_CTRL_2);
444 val = appl_readl(pcie, APPL_CTRL);
445 val |= APPL_CTRL_LTSSM_EN;
446 appl_writel(pcie, val, APPL_CTRL);
449 static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg)
451 struct tegra_pcie_dw *pcie = arg;
452 struct dw_pcie *pci = &pcie->pci;
455 speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
457 clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
459 /* If EP doesn't advertise L1SS, just return */
460 val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub);
461 if (!(val & (PCI_L1SS_CAP_ASPM_L1_1 | PCI_L1SS_CAP_ASPM_L1_2)))
464 /* Check if BME is set to '1' */
465 val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
466 if (val & PCI_COMMAND_MASTER) {
469 /* 110us for both snoop and no-snoop */
470 val = 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ;
471 val |= (val << LTR_MST_NO_SNOOP_SHIFT);
472 appl_writel(pcie, val, APPL_LTR_MSG_1);
474 /* Send LTR upstream */
475 val = appl_readl(pcie, APPL_LTR_MSG_2);
476 val |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE;
477 appl_writel(pcie, val, APPL_LTR_MSG_2);
479 timeout = ktime_add_us(ktime_get(), LTR_MSG_TIMEOUT);
481 val = appl_readl(pcie, APPL_LTR_MSG_2);
482 if (!(val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE))
484 if (ktime_after(ktime_get(), timeout))
486 usleep_range(1000, 1100);
488 if (val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE)
489 dev_err(pcie->dev, "Failed to send LTR message\n");
495 static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg)
497 struct tegra_pcie_dw *pcie = arg;
498 struct dw_pcie_ep *ep = &pcie->pci.ep;
502 val = appl_readl(pcie, APPL_INTR_STATUS_L0);
503 if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) {
504 val = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0);
505 appl_writel(pcie, val, APPL_INTR_STATUS_L1_0_0);
507 if (val & APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE)
508 pex_ep_event_hot_rst_done(pcie);
510 if (val & APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED) {
511 tmp = appl_readl(pcie, APPL_LINK_STATUS);
512 if (tmp & APPL_LINK_STATUS_RDLH_LINK_UP) {
513 dev_dbg(pcie->dev, "Link is up with Host\n");
514 dw_pcie_ep_linkup(ep);
521 if (val & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT) {
522 val = appl_readl(pcie, APPL_INTR_STATUS_L1_15);
523 appl_writel(pcie, val, APPL_INTR_STATUS_L1_15);
525 if (val & APPL_INTR_STATUS_L1_15_CFG_BME_CHGED)
526 return IRQ_WAKE_THREAD;
532 dev_warn(pcie->dev, "Random interrupt (STATUS = 0x%08X)\n",
534 appl_writel(pcie, val, APPL_INTR_STATUS_L0);
540 static int tegra_pcie_dw_rd_own_conf(struct pci_bus *bus, u32 devfn, int where,
544 * This is an endpoint mode specific register happen to appear even
545 * when controller is operating in root port mode and system hangs
546 * when it is accessed with link being in ASPM-L1 state.
547 * So skip accessing it altogether
549 if (!PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL) {
551 return PCIBIOS_SUCCESSFUL;
554 return pci_generic_config_read(bus, devfn, where, size, val);
557 static int tegra_pcie_dw_wr_own_conf(struct pci_bus *bus, u32 devfn, int where,
561 * This is an endpoint mode specific register happen to appear even
562 * when controller is operating in root port mode and system hangs
563 * when it is accessed with link being in ASPM-L1 state.
564 * So skip accessing it altogether
566 if (!PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL)
567 return PCIBIOS_SUCCESSFUL;
569 return pci_generic_config_write(bus, devfn, where, size, val);
572 static struct pci_ops tegra_pci_ops = {
573 .map_bus = dw_pcie_own_conf_map_bus,
574 .read = tegra_pcie_dw_rd_own_conf,
575 .write = tegra_pcie_dw_wr_own_conf,
578 #if defined(CONFIG_PCIEASPM)
579 static const u32 event_cntr_ctrl_offset[] = {
588 static const u32 event_cntr_data_offset[] = {
597 static void disable_aspm_l11(struct tegra_pcie_dw *pcie)
601 val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub);
602 val &= ~PCI_L1SS_CAP_ASPM_L1_1;
603 dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val);
606 static void disable_aspm_l12(struct tegra_pcie_dw *pcie)
610 val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub);
611 val &= ~PCI_L1SS_CAP_ASPM_L1_2;
612 dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val);
615 static inline u32 event_counter_prog(struct tegra_pcie_dw *pcie, u32 event)
619 val = dw_pcie_readl_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid]);
620 val &= ~(EVENT_COUNTER_EVENT_SEL_MASK << EVENT_COUNTER_EVENT_SEL_SHIFT);
621 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT;
622 val |= event << EVENT_COUNTER_EVENT_SEL_SHIFT;
623 val |= EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT;
624 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid], val);
625 val = dw_pcie_readl_dbi(&pcie->pci, event_cntr_data_offset[pcie->cid]);
630 static int aspm_state_cnt(struct seq_file *s, void *data)
632 struct tegra_pcie_dw *pcie = (struct tegra_pcie_dw *)
633 dev_get_drvdata(s->private);
636 seq_printf(s, "Tx L0s entry count : %u\n",
637 event_counter_prog(pcie, EVENT_COUNTER_EVENT_Tx_L0S));
639 seq_printf(s, "Rx L0s entry count : %u\n",
640 event_counter_prog(pcie, EVENT_COUNTER_EVENT_Rx_L0S));
642 seq_printf(s, "Link L1 entry count : %u\n",
643 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1));
645 seq_printf(s, "Link L1.1 entry count : %u\n",
646 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_1));
648 seq_printf(s, "Link L1.2 entry count : %u\n",
649 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_2));
651 /* Clear all counters */
652 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid],
653 EVENT_COUNTER_ALL_CLEAR);
655 /* Re-enable counting */
656 val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT;
657 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT;
658 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid], val);
663 static void init_host_aspm(struct tegra_pcie_dw *pcie)
665 struct dw_pcie *pci = &pcie->pci;
668 val = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS);
669 pcie->cfg_link_cap_l1sub = val + PCI_L1SS_CAP;
671 /* Enable ASPM counters */
672 val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT;
673 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT;
674 dw_pcie_writel_dbi(pci, event_cntr_ctrl_offset[pcie->cid], val);
676 /* Program T_cmrt and T_pwr_on values */
677 val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub);
678 val &= ~(PCI_L1SS_CAP_CM_RESTORE_TIME | PCI_L1SS_CAP_P_PWR_ON_VALUE);
679 val |= (pcie->aspm_cmrt << 8);
680 val |= (pcie->aspm_pwr_on_t << 19);
681 dw_pcie_writel_dbi(pci, pcie->cfg_link_cap_l1sub, val);
683 /* Program L0s and L1 entrance latencies */
684 val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR);
685 val &= ~PORT_AFR_L0S_ENTRANCE_LAT_MASK;
686 val |= (pcie->aspm_l0s_enter_lat << PORT_AFR_L0S_ENTRANCE_LAT_SHIFT);
687 val |= PORT_AFR_ENTER_ASPM;
688 dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
691 static void init_debugfs(struct tegra_pcie_dw *pcie)
693 debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt", pcie->debugfs,
697 static inline void disable_aspm_l12(struct tegra_pcie_dw *pcie) { return; }
698 static inline void disable_aspm_l11(struct tegra_pcie_dw *pcie) { return; }
699 static inline void init_host_aspm(struct tegra_pcie_dw *pcie) { return; }
700 static inline void init_debugfs(struct tegra_pcie_dw *pcie) { return; }
703 static void tegra_pcie_enable_system_interrupts(struct pcie_port *pp)
705 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
706 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
710 val = appl_readl(pcie, APPL_INTR_EN_L0_0);
711 val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN;
712 appl_writel(pcie, val, APPL_INTR_EN_L0_0);
714 val = appl_readl(pcie, APPL_INTR_EN_L1_0_0);
715 val |= APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN;
716 appl_writel(pcie, val, APPL_INTR_EN_L1_0_0);
718 if (pcie->enable_cdm_check) {
719 val = appl_readl(pcie, APPL_INTR_EN_L0_0);
720 val |= APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN;
721 appl_writel(pcie, val, APPL_INTR_EN_L0_0);
723 val = appl_readl(pcie, APPL_INTR_EN_L1_18);
724 val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR;
725 val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR;
726 appl_writel(pcie, val, APPL_INTR_EN_L1_18);
729 val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base +
731 pcie->init_link_width = (val_w & PCI_EXP_LNKSTA_NLW) >>
732 PCI_EXP_LNKSTA_NLW_SHIFT;
734 val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base +
736 val_w |= PCI_EXP_LNKCTL_LBMIE;
737 dw_pcie_writew_dbi(&pcie->pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL,
741 static void tegra_pcie_enable_legacy_interrupts(struct pcie_port *pp)
743 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
744 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
747 /* Enable legacy interrupt generation */
748 val = appl_readl(pcie, APPL_INTR_EN_L0_0);
749 val |= APPL_INTR_EN_L0_0_SYS_INTR_EN;
750 val |= APPL_INTR_EN_L0_0_INT_INT_EN;
751 appl_writel(pcie, val, APPL_INTR_EN_L0_0);
753 val = appl_readl(pcie, APPL_INTR_EN_L1_8_0);
754 val |= APPL_INTR_EN_L1_8_INTX_EN;
755 val |= APPL_INTR_EN_L1_8_AUTO_BW_INT_EN;
756 val |= APPL_INTR_EN_L1_8_BW_MGT_INT_EN;
757 if (IS_ENABLED(CONFIG_PCIEAER))
758 val |= APPL_INTR_EN_L1_8_AER_INT_EN;
759 appl_writel(pcie, val, APPL_INTR_EN_L1_8_0);
762 static void tegra_pcie_enable_msi_interrupts(struct pcie_port *pp)
764 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
765 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
768 /* Enable MSI interrupt generation */
769 val = appl_readl(pcie, APPL_INTR_EN_L0_0);
770 val |= APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN;
771 val |= APPL_INTR_EN_L0_0_MSI_RCV_INT_EN;
772 appl_writel(pcie, val, APPL_INTR_EN_L0_0);
775 static void tegra_pcie_enable_interrupts(struct pcie_port *pp)
777 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
778 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
780 /* Clear interrupt statuses before enabling interrupts */
781 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0);
782 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0);
783 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1);
784 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2);
785 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3);
786 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6);
787 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7);
788 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0);
789 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9);
790 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10);
791 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11);
792 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13);
793 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14);
794 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15);
795 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17);
797 tegra_pcie_enable_system_interrupts(pp);
798 tegra_pcie_enable_legacy_interrupts(pp);
799 if (IS_ENABLED(CONFIG_PCI_MSI))
800 tegra_pcie_enable_msi_interrupts(pp);
803 static void config_gen3_gen4_eq_presets(struct tegra_pcie_dw *pcie)
805 struct dw_pcie *pci = &pcie->pci;
808 /* Program init preset */
809 for (i = 0; i < pcie->num_lanes; i++) {
810 val = dw_pcie_readw_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2));
811 val &= ~CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK;
812 val |= GEN3_GEN4_EQ_PRESET_INIT;
813 val &= ~CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK;
814 val |= (GEN3_GEN4_EQ_PRESET_INIT <<
815 CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT);
816 dw_pcie_writew_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2), val);
818 offset = dw_pcie_find_ext_capability(pci,
819 PCI_EXT_CAP_ID_PL_16GT) +
821 val = dw_pcie_readb_dbi(pci, offset + i);
822 val &= ~PCI_PL_16GT_LE_CTRL_DSP_TX_PRESET_MASK;
823 val |= GEN3_GEN4_EQ_PRESET_INIT;
824 val &= ~PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_MASK;
825 val |= (GEN3_GEN4_EQ_PRESET_INIT <<
826 PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_SHIFT);
827 dw_pcie_writeb_dbi(pci, offset + i, val);
830 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
831 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK;
832 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val);
834 val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF);
835 val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK;
836 val |= (0x3ff << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT);
837 val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK;
838 dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val);
840 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
841 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK;
842 val |= (0x1 << GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT);
843 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val);
845 val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF);
846 val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK;
847 val |= (0x360 << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT);
848 val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK;
849 dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val);
851 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
852 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK;
853 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val);
856 static int tegra_pcie_dw_host_init(struct pcie_port *pp)
858 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
859 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
862 pp->bridge->ops = &tegra_pci_ops;
864 if (!pcie->pcie_cap_base)
865 pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci,
868 val = dw_pcie_readl_dbi(pci, PCI_IO_BASE);
869 val &= ~(IO_BASE_IO_DECODE | IO_BASE_IO_DECODE_BIT8);
870 dw_pcie_writel_dbi(pci, PCI_IO_BASE, val);
872 val = dw_pcie_readl_dbi(pci, PCI_PREF_MEMORY_BASE);
873 val |= CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE;
874 val |= CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE;
875 dw_pcie_writel_dbi(pci, PCI_PREF_MEMORY_BASE, val);
877 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
879 /* Enable as 0xFFFF0001 response for CRS */
880 val = dw_pcie_readl_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT);
881 val &= ~(AMBA_ERROR_RESPONSE_CRS_MASK << AMBA_ERROR_RESPONSE_CRS_SHIFT);
882 val |= (AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 <<
883 AMBA_ERROR_RESPONSE_CRS_SHIFT);
884 dw_pcie_writel_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT, val);
886 /* Configure Max lane width from DT */
887 val = dw_pcie_readl_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP);
888 val &= ~PCI_EXP_LNKCAP_MLW;
889 val |= (pcie->num_lanes << PCI_EXP_LNKSTA_NLW_SHIFT);
890 dw_pcie_writel_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP, val);
892 config_gen3_gen4_eq_presets(pcie);
894 init_host_aspm(pcie);
896 /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */
897 if (!pcie->supports_clkreq) {
898 disable_aspm_l11(pcie);
899 disable_aspm_l12(pcie);
902 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
903 val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL;
904 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val);
906 if (pcie->update_fc_fixup) {
907 val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF);
908 val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT;
909 dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val);
912 clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ);
917 static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
919 u32 val, offset, speed, tmp;
920 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
921 struct pcie_port *pp = &pci->pp;
924 if (pcie->mode == DW_PCIE_EP_TYPE) {
925 enable_irq(pcie->pex_rst_irq);
931 val = appl_readl(pcie, APPL_PINMUX);
932 val &= ~APPL_PINMUX_PEX_RST;
933 appl_writel(pcie, val, APPL_PINMUX);
935 usleep_range(100, 200);
938 val = appl_readl(pcie, APPL_CTRL);
939 val |= APPL_CTRL_LTSSM_EN;
940 appl_writel(pcie, val, APPL_CTRL);
943 val = appl_readl(pcie, APPL_PINMUX);
944 val |= APPL_PINMUX_PEX_RST;
945 appl_writel(pcie, val, APPL_PINMUX);
949 if (dw_pcie_wait_for_link(pci)) {
953 * There are some endpoints which can't get the link up if
954 * root port has Data Link Feature (DLF) enabled.
955 * Refer Spec rev 4.0 ver 1.0 sec 3.4.2 & 7.7.4 for more info
956 * on Scaled Flow Control and DLF.
957 * So, need to confirm that is indeed the case here and attempt
958 * link up once again with DLF disabled.
960 val = appl_readl(pcie, APPL_DEBUG);
961 val &= APPL_DEBUG_LTSSM_STATE_MASK;
962 val >>= APPL_DEBUG_LTSSM_STATE_SHIFT;
963 tmp = appl_readl(pcie, APPL_LINK_STATUS);
964 tmp &= APPL_LINK_STATUS_RDLH_LINK_UP;
965 if (!(val == 0x11 && !tmp)) {
966 /* Link is down for all good reasons */
970 dev_info(pci->dev, "Link is down in DLL");
971 dev_info(pci->dev, "Trying again with DLFE disabled\n");
973 val = appl_readl(pcie, APPL_CTRL);
974 val &= ~APPL_CTRL_LTSSM_EN;
975 appl_writel(pcie, val, APPL_CTRL);
977 reset_control_assert(pcie->core_rst);
978 reset_control_deassert(pcie->core_rst);
980 offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_DLF);
981 val = dw_pcie_readl_dbi(pci, offset + PCI_DLF_CAP);
982 val &= ~PCI_DLF_EXCHANGE_ENABLE;
983 dw_pcie_writel_dbi(pci, offset, val);
985 tegra_pcie_dw_host_init(pp);
986 dw_pcie_setup_rc(pp);
992 speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
994 clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
996 tegra_pcie_enable_interrupts(pp);
1001 static int tegra_pcie_dw_link_up(struct dw_pcie *pci)
1003 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
1004 u32 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA);
1006 return !!(val & PCI_EXP_LNKSTA_DLLLA);
1009 static void tegra_pcie_dw_stop_link(struct dw_pcie *pci)
1011 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
1013 disable_irq(pcie->pex_rst_irq);
1016 static const struct dw_pcie_ops tegra_dw_pcie_ops = {
1017 .link_up = tegra_pcie_dw_link_up,
1018 .start_link = tegra_pcie_dw_start_link,
1019 .stop_link = tegra_pcie_dw_stop_link,
1022 static const struct dw_pcie_host_ops tegra_pcie_dw_host_ops = {
1023 .host_init = tegra_pcie_dw_host_init,
1026 static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie)
1028 unsigned int phy_count = pcie->phy_count;
1030 while (phy_count--) {
1031 phy_power_off(pcie->phys[phy_count]);
1032 phy_exit(pcie->phys[phy_count]);
1036 static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie)
1041 for (i = 0; i < pcie->phy_count; i++) {
1042 ret = phy_init(pcie->phys[i]);
1046 ret = phy_power_on(pcie->phys[i]);
1055 phy_power_off(pcie->phys[i]);
1057 phy_exit(pcie->phys[i]);
1063 static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
1065 struct platform_device *pdev = to_platform_device(pcie->dev);
1066 struct device_node *np = pcie->dev->of_node;
1069 pcie->dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
1070 if (!pcie->dbi_res) {
1071 dev_err(pcie->dev, "Failed to find \"dbi\" region\n");
1075 ret = of_property_read_u32(np, "nvidia,aspm-cmrt-us", &pcie->aspm_cmrt);
1077 dev_info(pcie->dev, "Failed to read ASPM T_cmrt: %d\n", ret);
1081 ret = of_property_read_u32(np, "nvidia,aspm-pwr-on-t-us",
1082 &pcie->aspm_pwr_on_t);
1084 dev_info(pcie->dev, "Failed to read ASPM Power On time: %d\n",
1087 ret = of_property_read_u32(np, "nvidia,aspm-l0s-entrance-latency-us",
1088 &pcie->aspm_l0s_enter_lat);
1091 "Failed to read ASPM L0s Entrance latency: %d\n", ret);
1093 ret = of_property_read_u32(np, "num-lanes", &pcie->num_lanes);
1095 dev_err(pcie->dev, "Failed to read num-lanes: %d\n", ret);
1099 ret = of_property_read_u32_index(np, "nvidia,bpmp", 1, &pcie->cid);
1101 dev_err(pcie->dev, "Failed to read Controller-ID: %d\n", ret);
1105 ret = of_property_count_strings(np, "phy-names");
1107 dev_err(pcie->dev, "Failed to find PHY entries: %d\n",
1111 pcie->phy_count = ret;
1113 if (of_property_read_bool(np, "nvidia,update-fc-fixup"))
1114 pcie->update_fc_fixup = true;
1116 pcie->supports_clkreq =
1117 of_property_read_bool(pcie->dev->of_node, "supports-clkreq");
1119 pcie->enable_cdm_check =
1120 of_property_read_bool(np, "snps,enable-cdm-check");
1122 if (pcie->mode == DW_PCIE_RC_TYPE)
1125 /* Endpoint mode specific DT entries */
1126 pcie->pex_rst_gpiod = devm_gpiod_get(pcie->dev, "reset", GPIOD_IN);
1127 if (IS_ERR(pcie->pex_rst_gpiod)) {
1128 int err = PTR_ERR(pcie->pex_rst_gpiod);
1129 const char *level = KERN_ERR;
1131 if (err == -EPROBE_DEFER)
1134 dev_printk(level, pcie->dev,
1135 dev_fmt("Failed to get PERST GPIO: %d\n"),
1140 pcie->pex_refclk_sel_gpiod = devm_gpiod_get(pcie->dev,
1141 "nvidia,refclk-select",
1143 if (IS_ERR(pcie->pex_refclk_sel_gpiod)) {
1144 int err = PTR_ERR(pcie->pex_refclk_sel_gpiod);
1145 const char *level = KERN_ERR;
1147 if (err == -EPROBE_DEFER)
1150 dev_printk(level, pcie->dev,
1151 dev_fmt("Failed to get REFCLK select GPIOs: %d\n"),
1153 pcie->pex_refclk_sel_gpiod = NULL;
1159 static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
1162 struct mrq_uphy_response resp;
1163 struct tegra_bpmp_message msg;
1164 struct mrq_uphy_request req;
1166 /* Controller-5 doesn't need to have its state set by BPMP-FW */
1170 memset(&req, 0, sizeof(req));
1171 memset(&resp, 0, sizeof(resp));
1173 req.cmd = CMD_UPHY_PCIE_CONTROLLER_STATE;
1174 req.controller_state.pcie_controller = pcie->cid;
1175 req.controller_state.enable = enable;
1177 memset(&msg, 0, sizeof(msg));
1180 msg.tx.size = sizeof(req);
1181 msg.rx.data = &resp;
1182 msg.rx.size = sizeof(resp);
1184 return tegra_bpmp_transfer(pcie->bpmp, &msg);
1187 static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
1190 struct mrq_uphy_response resp;
1191 struct tegra_bpmp_message msg;
1192 struct mrq_uphy_request req;
1194 memset(&req, 0, sizeof(req));
1195 memset(&resp, 0, sizeof(resp));
1198 req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_INIT;
1199 req.ep_ctrlr_pll_init.ep_controller = pcie->cid;
1201 req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_OFF;
1202 req.ep_ctrlr_pll_off.ep_controller = pcie->cid;
1205 memset(&msg, 0, sizeof(msg));
1208 msg.tx.size = sizeof(req);
1209 msg.rx.data = &resp;
1210 msg.rx.size = sizeof(resp);
1212 return tegra_bpmp_transfer(pcie->bpmp, &msg);
1215 static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
1217 struct pcie_port *pp = &pcie->pci.pp;
1218 struct pci_bus *child, *root_bus = NULL;
1219 struct pci_dev *pdev;
1222 * link doesn't go into L2 state with some of the endpoints with Tegra
1223 * if they are not in D0 state. So, need to make sure that immediate
1224 * downstream devices are in D0 state before sending PME_TurnOff to put
1225 * link into L2 state.
1226 * This is as per PCI Express Base r4.0 v1.0 September 27-2017,
1227 * 5.2 Link State Power Management (Page #428).
1230 list_for_each_entry(child, &pp->bridge->bus->children, node) {
1231 /* Bring downstream devices to D0 if they are not already in */
1232 if (child->parent == pp->bridge->bus) {
1239 dev_err(pcie->dev, "Failed to find downstream devices\n");
1243 list_for_each_entry(pdev, &root_bus->devices, bus_list) {
1244 if (PCI_SLOT(pdev->devfn) == 0) {
1245 if (pci_set_power_state(pdev, PCI_D0))
1247 "Failed to transition %s to D0 state\n",
1248 dev_name(&pdev->dev));
1253 static int tegra_pcie_get_slot_regulators(struct tegra_pcie_dw *pcie)
1255 pcie->slot_ctl_3v3 = devm_regulator_get_optional(pcie->dev, "vpcie3v3");
1256 if (IS_ERR(pcie->slot_ctl_3v3)) {
1257 if (PTR_ERR(pcie->slot_ctl_3v3) != -ENODEV)
1258 return PTR_ERR(pcie->slot_ctl_3v3);
1260 pcie->slot_ctl_3v3 = NULL;
1263 pcie->slot_ctl_12v = devm_regulator_get_optional(pcie->dev, "vpcie12v");
1264 if (IS_ERR(pcie->slot_ctl_12v)) {
1265 if (PTR_ERR(pcie->slot_ctl_12v) != -ENODEV)
1266 return PTR_ERR(pcie->slot_ctl_12v);
1268 pcie->slot_ctl_12v = NULL;
1274 static int tegra_pcie_enable_slot_regulators(struct tegra_pcie_dw *pcie)
1278 if (pcie->slot_ctl_3v3) {
1279 ret = regulator_enable(pcie->slot_ctl_3v3);
1282 "Failed to enable 3.3V slot supply: %d\n", ret);
1287 if (pcie->slot_ctl_12v) {
1288 ret = regulator_enable(pcie->slot_ctl_12v);
1291 "Failed to enable 12V slot supply: %d\n", ret);
1292 goto fail_12v_enable;
1297 * According to PCI Express Card Electromechanical Specification
1298 * Revision 1.1, Table-2.4, T_PVPERL (Power stable to PERST# inactive)
1299 * should be a minimum of 100ms.
1301 if (pcie->slot_ctl_3v3 || pcie->slot_ctl_12v)
1307 if (pcie->slot_ctl_3v3)
1308 regulator_disable(pcie->slot_ctl_3v3);
1312 static void tegra_pcie_disable_slot_regulators(struct tegra_pcie_dw *pcie)
1314 if (pcie->slot_ctl_12v)
1315 regulator_disable(pcie->slot_ctl_12v);
1316 if (pcie->slot_ctl_3v3)
1317 regulator_disable(pcie->slot_ctl_3v3);
1320 static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie,
1326 ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true);
1329 "Failed to enable controller %u: %d\n", pcie->cid, ret);
1333 ret = tegra_pcie_enable_slot_regulators(pcie);
1335 goto fail_slot_reg_en;
1337 ret = regulator_enable(pcie->pex_ctl_supply);
1339 dev_err(pcie->dev, "Failed to enable regulator: %d\n", ret);
1343 ret = clk_prepare_enable(pcie->core_clk);
1345 dev_err(pcie->dev, "Failed to enable core clock: %d\n", ret);
1349 ret = reset_control_deassert(pcie->core_apb_rst);
1351 dev_err(pcie->dev, "Failed to deassert core APB reset: %d\n",
1353 goto fail_core_apb_rst;
1356 if (en_hw_hot_rst) {
1357 /* Enable HW_HOT_RST mode */
1358 val = appl_readl(pcie, APPL_CTRL);
1359 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
1360 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
1361 val |= APPL_CTRL_HW_HOT_RST_EN;
1362 appl_writel(pcie, val, APPL_CTRL);
1365 ret = tegra_pcie_enable_phy(pcie);
1367 dev_err(pcie->dev, "Failed to enable PHY: %d\n", ret);
1371 /* Update CFG base address */
1372 appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK,
1373 APPL_CFG_BASE_ADDR);
1375 /* Configure this core for RP mode operation */
1376 appl_writel(pcie, APPL_DM_TYPE_RP, APPL_DM_TYPE);
1378 appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE);
1380 val = appl_readl(pcie, APPL_CTRL);
1381 appl_writel(pcie, val | APPL_CTRL_SYS_PRE_DET_STATE, APPL_CTRL);
1383 val = appl_readl(pcie, APPL_CFG_MISC);
1384 val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT);
1385 appl_writel(pcie, val, APPL_CFG_MISC);
1387 if (!pcie->supports_clkreq) {
1388 val = appl_readl(pcie, APPL_PINMUX);
1389 val |= APPL_PINMUX_CLKREQ_OVERRIDE_EN;
1390 val &= ~APPL_PINMUX_CLKREQ_OVERRIDE;
1391 appl_writel(pcie, val, APPL_PINMUX);
1394 /* Update iATU_DMA base address */
1396 pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK,
1397 APPL_CFG_IATU_DMA_BASE_ADDR);
1399 reset_control_deassert(pcie->core_rst);
1404 reset_control_assert(pcie->core_apb_rst);
1406 clk_disable_unprepare(pcie->core_clk);
1408 regulator_disable(pcie->pex_ctl_supply);
1410 tegra_pcie_disable_slot_regulators(pcie);
1412 tegra_pcie_bpmp_set_ctrl_state(pcie, false);
1417 static void tegra_pcie_unconfig_controller(struct tegra_pcie_dw *pcie)
1421 ret = reset_control_assert(pcie->core_rst);
1423 dev_err(pcie->dev, "Failed to assert \"core\" reset: %d\n", ret);
1425 tegra_pcie_disable_phy(pcie);
1427 ret = reset_control_assert(pcie->core_apb_rst);
1429 dev_err(pcie->dev, "Failed to assert APB reset: %d\n", ret);
1431 clk_disable_unprepare(pcie->core_clk);
1433 ret = regulator_disable(pcie->pex_ctl_supply);
1435 dev_err(pcie->dev, "Failed to disable regulator: %d\n", ret);
1437 tegra_pcie_disable_slot_regulators(pcie);
1439 ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false);
1441 dev_err(pcie->dev, "Failed to disable controller %d: %d\n",
1445 static int tegra_pcie_init_controller(struct tegra_pcie_dw *pcie)
1447 struct dw_pcie *pci = &pcie->pci;
1448 struct pcie_port *pp = &pci->pp;
1451 ret = tegra_pcie_config_controller(pcie, false);
1455 pp->ops = &tegra_pcie_dw_host_ops;
1457 ret = dw_pcie_host_init(pp);
1459 dev_err(pcie->dev, "Failed to add PCIe port: %d\n", ret);
1460 goto fail_host_init;
1466 tegra_pcie_unconfig_controller(pcie);
1470 static int tegra_pcie_try_link_l2(struct tegra_pcie_dw *pcie)
1474 if (!tegra_pcie_dw_link_up(&pcie->pci))
1477 val = appl_readl(pcie, APPL_RADM_STATUS);
1478 val |= APPL_PM_XMT_TURNOFF_STATE;
1479 appl_writel(pcie, val, APPL_RADM_STATUS);
1481 return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val,
1482 val & APPL_DEBUG_PM_LINKST_IN_L2_LAT,
1483 1, PME_ACK_TIMEOUT);
1486 static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie)
1491 if (!tegra_pcie_dw_link_up(&pcie->pci)) {
1492 dev_dbg(pcie->dev, "PCIe link is not up...!\n");
1496 if (tegra_pcie_try_link_l2(pcie)) {
1497 dev_info(pcie->dev, "Link didn't transition to L2 state\n");
1499 * TX lane clock freq will reset to Gen1 only if link is in L2
1501 * So apply pex_rst to end point to force RP to go into detect
1504 data = appl_readl(pcie, APPL_PINMUX);
1505 data &= ~APPL_PINMUX_PEX_RST;
1506 appl_writel(pcie, data, APPL_PINMUX);
1509 * Some cards do not go to detect state even after de-asserting
1510 * PERST#. So, de-assert LTSSM to bring link to detect state.
1512 data = readl(pcie->appl_base + APPL_CTRL);
1513 data &= ~APPL_CTRL_LTSSM_EN;
1514 writel(data, pcie->appl_base + APPL_CTRL);
1516 err = readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG,
1519 APPL_DEBUG_LTSSM_STATE_MASK) >>
1520 APPL_DEBUG_LTSSM_STATE_SHIFT) ==
1521 LTSSM_STATE_PRE_DETECT,
1524 dev_info(pcie->dev, "Link didn't go to detect state\n");
1527 * DBI registers may not be accessible after this as PLL-E would be
1528 * down depending on how CLKREQ is pulled by end point
1530 data = appl_readl(pcie, APPL_PINMUX);
1531 data |= (APPL_PINMUX_CLKREQ_OVERRIDE_EN | APPL_PINMUX_CLKREQ_OVERRIDE);
1532 /* Cut REFCLK to slot */
1533 data |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN;
1534 data &= ~APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE;
1535 appl_writel(pcie, data, APPL_PINMUX);
1538 static void tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie)
1540 tegra_pcie_downstream_dev_to_D0(pcie);
1541 dw_pcie_host_deinit(&pcie->pci.pp);
1542 tegra_pcie_dw_pme_turnoff(pcie);
1543 tegra_pcie_unconfig_controller(pcie);
1546 static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
1548 struct device *dev = pcie->dev;
1552 pm_runtime_enable(dev);
1554 ret = pm_runtime_get_sync(dev);
1556 dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n",
1558 goto fail_pm_get_sync;
1561 ret = pinctrl_pm_select_default_state(dev);
1563 dev_err(dev, "Failed to configure sideband pins: %d\n", ret);
1564 goto fail_pm_get_sync;
1567 ret = tegra_pcie_init_controller(pcie);
1569 dev_err(dev, "Failed to initialize controller: %d\n", ret);
1570 goto fail_pm_get_sync;
1573 pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci);
1574 if (!pcie->link_state) {
1576 goto fail_host_init;
1579 name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
1582 goto fail_host_init;
1585 pcie->debugfs = debugfs_create_dir(name, NULL);
1591 tegra_pcie_deinit_controller(pcie);
1593 pm_runtime_put_sync(dev);
1594 pm_runtime_disable(dev);
1598 static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie)
1603 if (pcie->ep_state == EP_STATE_DISABLED)
1607 val = appl_readl(pcie, APPL_CTRL);
1608 val &= ~APPL_CTRL_LTSSM_EN;
1609 appl_writel(pcie, val, APPL_CTRL);
1611 ret = readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val,
1612 ((val & APPL_DEBUG_LTSSM_STATE_MASK) >>
1613 APPL_DEBUG_LTSSM_STATE_SHIFT) ==
1614 LTSSM_STATE_PRE_DETECT,
1617 dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret);
1619 reset_control_assert(pcie->core_rst);
1621 tegra_pcie_disable_phy(pcie);
1623 reset_control_assert(pcie->core_apb_rst);
1625 clk_disable_unprepare(pcie->core_clk);
1627 pm_runtime_put_sync(pcie->dev);
1629 ret = tegra_pcie_bpmp_set_pll_state(pcie, false);
1631 dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret);
1633 pcie->ep_state = EP_STATE_DISABLED;
1634 dev_dbg(pcie->dev, "Uninitialization of endpoint is completed\n");
1637 static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie)
1639 struct dw_pcie *pci = &pcie->pci;
1640 struct dw_pcie_ep *ep = &pci->ep;
1641 struct device *dev = pcie->dev;
1645 if (pcie->ep_state == EP_STATE_ENABLED)
1648 ret = pm_runtime_resume_and_get(dev);
1650 dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n",
1655 ret = tegra_pcie_bpmp_set_pll_state(pcie, true);
1657 dev_err(dev, "Failed to init UPHY for PCIe EP: %d\n", ret);
1661 ret = clk_prepare_enable(pcie->core_clk);
1663 dev_err(dev, "Failed to enable core clock: %d\n", ret);
1664 goto fail_core_clk_enable;
1667 ret = reset_control_deassert(pcie->core_apb_rst);
1669 dev_err(dev, "Failed to deassert core APB reset: %d\n", ret);
1670 goto fail_core_apb_rst;
1673 ret = tegra_pcie_enable_phy(pcie);
1675 dev_err(dev, "Failed to enable PHY: %d\n", ret);
1679 /* Clear any stale interrupt statuses */
1680 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0);
1681 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0);
1682 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1);
1683 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2);
1684 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3);
1685 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6);
1686 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7);
1687 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0);
1688 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9);
1689 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10);
1690 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11);
1691 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13);
1692 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14);
1693 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15);
1694 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17);
1696 /* configure this core for EP mode operation */
1697 val = appl_readl(pcie, APPL_DM_TYPE);
1698 val &= ~APPL_DM_TYPE_MASK;
1699 val |= APPL_DM_TYPE_EP;
1700 appl_writel(pcie, val, APPL_DM_TYPE);
1702 appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE);
1704 val = appl_readl(pcie, APPL_CTRL);
1705 val |= APPL_CTRL_SYS_PRE_DET_STATE;
1706 val |= APPL_CTRL_HW_HOT_RST_EN;
1707 appl_writel(pcie, val, APPL_CTRL);
1709 val = appl_readl(pcie, APPL_CFG_MISC);
1710 val |= APPL_CFG_MISC_SLV_EP_MODE;
1711 val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT);
1712 appl_writel(pcie, val, APPL_CFG_MISC);
1714 val = appl_readl(pcie, APPL_PINMUX);
1715 val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN;
1716 val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE;
1717 appl_writel(pcie, val, APPL_PINMUX);
1719 appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK,
1720 APPL_CFG_BASE_ADDR);
1722 appl_writel(pcie, pcie->atu_dma_res->start &
1723 APPL_CFG_IATU_DMA_BASE_ADDR_MASK,
1724 APPL_CFG_IATU_DMA_BASE_ADDR);
1726 val = appl_readl(pcie, APPL_INTR_EN_L0_0);
1727 val |= APPL_INTR_EN_L0_0_SYS_INTR_EN;
1728 val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN;
1729 val |= APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN;
1730 appl_writel(pcie, val, APPL_INTR_EN_L0_0);
1732 val = appl_readl(pcie, APPL_INTR_EN_L1_0_0);
1733 val |= APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN;
1734 val |= APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN;
1735 appl_writel(pcie, val, APPL_INTR_EN_L1_0_0);
1737 reset_control_deassert(pcie->core_rst);
1739 if (pcie->update_fc_fixup) {
1740 val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF);
1741 val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT;
1742 dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val);
1745 config_gen3_gen4_eq_presets(pcie);
1747 init_host_aspm(pcie);
1749 /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */
1750 if (!pcie->supports_clkreq) {
1751 disable_aspm_l11(pcie);
1752 disable_aspm_l12(pcie);
1755 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
1756 val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL;
1757 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val);
1759 pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci,
1761 clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ);
1763 val = (ep->msi_mem_phys & MSIX_ADDR_MATCH_LOW_OFF_MASK);
1764 val |= MSIX_ADDR_MATCH_LOW_OFF_EN;
1765 dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_LOW_OFF, val);
1766 val = (lower_32_bits(ep->msi_mem_phys) & MSIX_ADDR_MATCH_HIGH_OFF_MASK);
1767 dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_HIGH_OFF, val);
1769 ret = dw_pcie_ep_init_complete(ep);
1771 dev_err(dev, "Failed to complete initialization: %d\n", ret);
1772 goto fail_init_complete;
1775 dw_pcie_ep_init_notify(ep);
1778 val = appl_readl(pcie, APPL_CTRL);
1779 val |= APPL_CTRL_LTSSM_EN;
1780 appl_writel(pcie, val, APPL_CTRL);
1782 pcie->ep_state = EP_STATE_ENABLED;
1783 dev_dbg(dev, "Initialization of endpoint is completed\n");
1788 reset_control_assert(pcie->core_rst);
1789 tegra_pcie_disable_phy(pcie);
1791 reset_control_assert(pcie->core_apb_rst);
1793 clk_disable_unprepare(pcie->core_clk);
1794 fail_core_clk_enable:
1795 tegra_pcie_bpmp_set_pll_state(pcie, false);
1797 pm_runtime_put_sync(dev);
1800 static irqreturn_t tegra_pcie_ep_pex_rst_irq(int irq, void *arg)
1802 struct tegra_pcie_dw *pcie = arg;
1804 if (gpiod_get_value(pcie->pex_rst_gpiod))
1805 pex_ep_event_pex_rst_assert(pcie);
1807 pex_ep_event_pex_rst_deassert(pcie);
1812 static int tegra_pcie_ep_raise_legacy_irq(struct tegra_pcie_dw *pcie, u16 irq)
1814 /* Tegra194 supports only INTA */
1818 appl_writel(pcie, 1, APPL_LEGACY_INTX);
1819 usleep_range(1000, 2000);
1820 appl_writel(pcie, 0, APPL_LEGACY_INTX);
1824 static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq)
1826 if (unlikely(irq > 31))
1829 appl_writel(pcie, BIT(irq), APPL_MSI_CTRL_1);
1834 static int tegra_pcie_ep_raise_msix_irq(struct tegra_pcie_dw *pcie, u16 irq)
1836 struct dw_pcie_ep *ep = &pcie->pci.ep;
1838 writel(irq, ep->msi_mem);
1843 static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
1844 enum pci_epc_irq_type type,
1847 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
1848 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
1851 case PCI_EPC_IRQ_LEGACY:
1852 return tegra_pcie_ep_raise_legacy_irq(pcie, interrupt_num);
1854 case PCI_EPC_IRQ_MSI:
1855 return tegra_pcie_ep_raise_msi_irq(pcie, interrupt_num);
1857 case PCI_EPC_IRQ_MSIX:
1858 return tegra_pcie_ep_raise_msix_irq(pcie, interrupt_num);
1861 dev_err(pci->dev, "Unknown IRQ type\n");
1868 static const struct pci_epc_features tegra_pcie_epc_features = {
1869 .linkup_notifier = true,
1870 .core_init_notifier = true,
1871 .msi_capable = false,
1872 .msix_capable = false,
1873 .reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5,
1874 .bar_fixed_64bit = 1 << BAR_0,
1875 .bar_fixed_size[0] = SZ_1M,
1878 static const struct pci_epc_features*
1879 tegra_pcie_ep_get_features(struct dw_pcie_ep *ep)
1881 return &tegra_pcie_epc_features;
1884 static const struct dw_pcie_ep_ops pcie_ep_ops = {
1885 .raise_irq = tegra_pcie_ep_raise_irq,
1886 .get_features = tegra_pcie_ep_get_features,
1889 static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie,
1890 struct platform_device *pdev)
1892 struct dw_pcie *pci = &pcie->pci;
1893 struct device *dev = pcie->dev;
1894 struct dw_pcie_ep *ep;
1899 ep->ops = &pcie_ep_ops;
1901 ep->page_size = SZ_64K;
1903 ret = gpiod_set_debounce(pcie->pex_rst_gpiod, PERST_DEBOUNCE_TIME);
1905 dev_err(dev, "Failed to set PERST GPIO debounce time: %d\n",
1910 ret = gpiod_to_irq(pcie->pex_rst_gpiod);
1912 dev_err(dev, "Failed to get IRQ for PERST GPIO: %d\n", ret);
1915 pcie->pex_rst_irq = (unsigned int)ret;
1917 name = devm_kasprintf(dev, GFP_KERNEL, "tegra_pcie_%u_pex_rst_irq",
1920 dev_err(dev, "Failed to create PERST IRQ string\n");
1924 irq_set_status_flags(pcie->pex_rst_irq, IRQ_NOAUTOEN);
1926 pcie->ep_state = EP_STATE_DISABLED;
1928 ret = devm_request_threaded_irq(dev, pcie->pex_rst_irq, NULL,
1929 tegra_pcie_ep_pex_rst_irq,
1930 IRQF_TRIGGER_RISING |
1931 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1932 name, (void *)pcie);
1934 dev_err(dev, "Failed to request IRQ for PERST: %d\n", ret);
1938 name = devm_kasprintf(dev, GFP_KERNEL, "tegra_pcie_%u_ep_work",
1941 dev_err(dev, "Failed to create PCIe EP work thread string\n");
1945 pm_runtime_enable(dev);
1947 ret = dw_pcie_ep_init(ep);
1949 dev_err(dev, "Failed to initialize DWC Endpoint subsystem: %d\n",
1957 static int tegra_pcie_dw_probe(struct platform_device *pdev)
1959 const struct tegra_pcie_dw_of_data *data;
1960 struct device *dev = &pdev->dev;
1961 struct resource *atu_dma_res;
1962 struct tegra_pcie_dw *pcie;
1963 struct pcie_port *pp;
1964 struct dw_pcie *pci;
1970 data = of_device_get_match_data(dev);
1972 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
1977 pci->dev = &pdev->dev;
1978 pci->ops = &tegra_dw_pcie_ops;
1979 pci->n_fts[0] = N_FTS_VAL;
1980 pci->n_fts[1] = FTS_VAL;
1981 pci->version = 0x490A;
1984 pp->num_vectors = MAX_MSI_IRQS;
1985 pcie->dev = &pdev->dev;
1986 pcie->mode = (enum dw_pcie_device_mode)data->mode;
1988 ret = tegra_pcie_dw_parse_dt(pcie);
1990 const char *level = KERN_ERR;
1992 if (ret == -EPROBE_DEFER)
1995 dev_printk(level, dev,
1996 dev_fmt("Failed to parse device tree: %d\n"),
2001 ret = tegra_pcie_get_slot_regulators(pcie);
2003 const char *level = KERN_ERR;
2005 if (ret == -EPROBE_DEFER)
2008 dev_printk(level, dev,
2009 dev_fmt("Failed to get slot regulators: %d\n"),
2014 if (pcie->pex_refclk_sel_gpiod)
2015 gpiod_set_value(pcie->pex_refclk_sel_gpiod, 1);
2017 pcie->pex_ctl_supply = devm_regulator_get(dev, "vddio-pex-ctl");
2018 if (IS_ERR(pcie->pex_ctl_supply)) {
2019 ret = PTR_ERR(pcie->pex_ctl_supply);
2020 if (ret != -EPROBE_DEFER)
2021 dev_err(dev, "Failed to get regulator: %ld\n",
2022 PTR_ERR(pcie->pex_ctl_supply));
2026 pcie->core_clk = devm_clk_get(dev, "core");
2027 if (IS_ERR(pcie->core_clk)) {
2028 dev_err(dev, "Failed to get core clock: %ld\n",
2029 PTR_ERR(pcie->core_clk));
2030 return PTR_ERR(pcie->core_clk);
2033 pcie->appl_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2035 if (!pcie->appl_res) {
2036 dev_err(dev, "Failed to find \"appl\" region\n");
2040 pcie->appl_base = devm_ioremap_resource(dev, pcie->appl_res);
2041 if (IS_ERR(pcie->appl_base))
2042 return PTR_ERR(pcie->appl_base);
2044 pcie->core_apb_rst = devm_reset_control_get(dev, "apb");
2045 if (IS_ERR(pcie->core_apb_rst)) {
2046 dev_err(dev, "Failed to get APB reset: %ld\n",
2047 PTR_ERR(pcie->core_apb_rst));
2048 return PTR_ERR(pcie->core_apb_rst);
2051 phys = devm_kcalloc(dev, pcie->phy_count, sizeof(*phys), GFP_KERNEL);
2055 for (i = 0; i < pcie->phy_count; i++) {
2056 name = kasprintf(GFP_KERNEL, "p2u-%u", i);
2058 dev_err(dev, "Failed to create P2U string\n");
2061 phys[i] = devm_phy_get(dev, name);
2063 if (IS_ERR(phys[i])) {
2064 ret = PTR_ERR(phys[i]);
2065 if (ret != -EPROBE_DEFER)
2066 dev_err(dev, "Failed to get PHY: %d\n", ret);
2073 atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2076 dev_err(dev, "Failed to find \"atu_dma\" region\n");
2079 pcie->atu_dma_res = atu_dma_res;
2081 pci->atu_size = resource_size(atu_dma_res);
2082 pci->atu_base = devm_ioremap_resource(dev, atu_dma_res);
2083 if (IS_ERR(pci->atu_base))
2084 return PTR_ERR(pci->atu_base);
2086 pcie->core_rst = devm_reset_control_get(dev, "core");
2087 if (IS_ERR(pcie->core_rst)) {
2088 dev_err(dev, "Failed to get core reset: %ld\n",
2089 PTR_ERR(pcie->core_rst));
2090 return PTR_ERR(pcie->core_rst);
2093 pp->irq = platform_get_irq_byname(pdev, "intr");
2097 pcie->bpmp = tegra_bpmp_get(dev);
2098 if (IS_ERR(pcie->bpmp))
2099 return PTR_ERR(pcie->bpmp);
2101 platform_set_drvdata(pdev, pcie);
2103 switch (pcie->mode) {
2104 case DW_PCIE_RC_TYPE:
2105 ret = devm_request_irq(dev, pp->irq, tegra_pcie_rp_irq_handler,
2106 IRQF_SHARED, "tegra-pcie-intr", pcie);
2108 dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq,
2113 ret = tegra_pcie_config_rp(pcie);
2114 if (ret && ret != -ENOMEDIUM)
2120 case DW_PCIE_EP_TYPE:
2121 ret = devm_request_threaded_irq(dev, pp->irq,
2122 tegra_pcie_ep_hard_irq,
2123 tegra_pcie_ep_irq_thread,
2124 IRQF_SHARED | IRQF_ONESHOT,
2125 "tegra-pcie-ep-intr", pcie);
2127 dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq,
2132 ret = tegra_pcie_config_ep(pcie, pdev);
2138 dev_err(dev, "Invalid PCIe device type %d\n", pcie->mode);
2142 tegra_bpmp_put(pcie->bpmp);
2146 static int tegra_pcie_dw_remove(struct platform_device *pdev)
2148 struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
2150 if (!pcie->link_state)
2153 debugfs_remove_recursive(pcie->debugfs);
2154 tegra_pcie_deinit_controller(pcie);
2155 pm_runtime_put_sync(pcie->dev);
2156 pm_runtime_disable(pcie->dev);
2157 tegra_bpmp_put(pcie->bpmp);
2158 if (pcie->pex_refclk_sel_gpiod)
2159 gpiod_set_value(pcie->pex_refclk_sel_gpiod, 0);
2164 static int tegra_pcie_dw_suspend_late(struct device *dev)
2166 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
2169 if (!pcie->link_state)
2172 /* Enable HW_HOT_RST mode */
2173 val = appl_readl(pcie, APPL_CTRL);
2174 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
2175 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
2176 val |= APPL_CTRL_HW_HOT_RST_EN;
2177 appl_writel(pcie, val, APPL_CTRL);
2182 static int tegra_pcie_dw_suspend_noirq(struct device *dev)
2184 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
2186 if (!pcie->link_state)
2189 /* Save MSI interrupt vector */
2190 pcie->msi_ctrl_int = dw_pcie_readl_dbi(&pcie->pci,
2191 PORT_LOGIC_MSI_CTRL_INT_0_EN);
2192 tegra_pcie_downstream_dev_to_D0(pcie);
2193 tegra_pcie_dw_pme_turnoff(pcie);
2194 tegra_pcie_unconfig_controller(pcie);
2199 static int tegra_pcie_dw_resume_noirq(struct device *dev)
2201 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
2204 if (!pcie->link_state)
2207 ret = tegra_pcie_config_controller(pcie, true);
2211 ret = tegra_pcie_dw_host_init(&pcie->pci.pp);
2213 dev_err(dev, "Failed to init host: %d\n", ret);
2214 goto fail_host_init;
2217 dw_pcie_setup_rc(&pcie->pci.pp);
2219 ret = tegra_pcie_dw_start_link(&pcie->pci);
2221 goto fail_host_init;
2223 /* Restore MSI interrupt vector */
2224 dw_pcie_writel_dbi(&pcie->pci, PORT_LOGIC_MSI_CTRL_INT_0_EN,
2225 pcie->msi_ctrl_int);
2230 tegra_pcie_unconfig_controller(pcie);
2234 static int tegra_pcie_dw_resume_early(struct device *dev)
2236 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
2239 if (!pcie->link_state)
2242 /* Disable HW_HOT_RST mode */
2243 val = appl_readl(pcie, APPL_CTRL);
2244 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
2245 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
2246 val |= APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST <<
2247 APPL_CTRL_HW_HOT_RST_MODE_SHIFT;
2248 val &= ~APPL_CTRL_HW_HOT_RST_EN;
2249 appl_writel(pcie, val, APPL_CTRL);
2254 static void tegra_pcie_dw_shutdown(struct platform_device *pdev)
2256 struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
2258 if (!pcie->link_state)
2261 debugfs_remove_recursive(pcie->debugfs);
2262 tegra_pcie_downstream_dev_to_D0(pcie);
2264 disable_irq(pcie->pci.pp.irq);
2265 if (IS_ENABLED(CONFIG_PCI_MSI))
2266 disable_irq(pcie->pci.pp.msi_irq);
2268 tegra_pcie_dw_pme_turnoff(pcie);
2269 tegra_pcie_unconfig_controller(pcie);
2272 static const struct tegra_pcie_dw_of_data tegra_pcie_dw_rc_of_data = {
2273 .mode = DW_PCIE_RC_TYPE,
2276 static const struct tegra_pcie_dw_of_data tegra_pcie_dw_ep_of_data = {
2277 .mode = DW_PCIE_EP_TYPE,
2280 static const struct of_device_id tegra_pcie_dw_of_match[] = {
2282 .compatible = "nvidia,tegra194-pcie",
2283 .data = &tegra_pcie_dw_rc_of_data,
2286 .compatible = "nvidia,tegra194-pcie-ep",
2287 .data = &tegra_pcie_dw_ep_of_data,
2292 static const struct dev_pm_ops tegra_pcie_dw_pm_ops = {
2293 .suspend_late = tegra_pcie_dw_suspend_late,
2294 .suspend_noirq = tegra_pcie_dw_suspend_noirq,
2295 .resume_noirq = tegra_pcie_dw_resume_noirq,
2296 .resume_early = tegra_pcie_dw_resume_early,
2299 static struct platform_driver tegra_pcie_dw_driver = {
2300 .probe = tegra_pcie_dw_probe,
2301 .remove = tegra_pcie_dw_remove,
2302 .shutdown = tegra_pcie_dw_shutdown,
2304 .name = "tegra194-pcie",
2305 .pm = &tegra_pcie_dw_pm_ops,
2306 .of_match_table = tegra_pcie_dw_of_match,
2309 module_platform_driver(tegra_pcie_dw_driver);
2311 MODULE_DEVICE_TABLE(of, tegra_pcie_dw_of_match);
2313 MODULE_AUTHOR("Vidya Sagar <vidyas@nvidia.com>");
2314 MODULE_DESCRIPTION("NVIDIA PCIe host controller driver");
2315 MODULE_LICENSE("GPL v2");