1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for the Aardvark PCIe controller, used on Marvell Armada
6 * Copyright (C) 2016 Marvell
8 * Author: Hezi Shahmoon <hezi.shahmoon@marvell.com>
11 #include <linux/delay.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/irqdomain.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
19 #include <linux/pci-ecam.h>
20 #include <linux/init.h>
21 #include <linux/phy/phy.h>
22 #include <linux/platform_device.h>
23 #include <linux/msi.h>
24 #include <linux/of_address.h>
25 #include <linux/of_gpio.h>
26 #include <linux/of_pci.h>
29 #include "../pci-bridge-emul.h"
31 /* PCIe core registers */
32 #define PCIE_CORE_DEV_ID_REG 0x0
33 #define PCIE_CORE_CMD_STATUS_REG 0x4
34 #define PCIE_CORE_DEV_REV_REG 0x8
35 #define PCIE_CORE_PCIEXP_CAP 0xc0
36 #define PCIE_CORE_ERR_CAPCTL_REG 0x118
37 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
38 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
39 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK BIT(7)
40 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV BIT(8)
41 #define PCIE_CORE_INT_A_ASSERT_ENABLE 1
42 #define PCIE_CORE_INT_B_ASSERT_ENABLE 2
43 #define PCIE_CORE_INT_C_ASSERT_ENABLE 3
44 #define PCIE_CORE_INT_D_ASSERT_ENABLE 4
45 /* PIO registers base address and register offsets */
46 #define PIO_BASE_ADDR 0x4000
47 #define PIO_CTRL (PIO_BASE_ADDR + 0x0)
48 #define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
49 #define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
50 #define PIO_STAT (PIO_BASE_ADDR + 0x4)
51 #define PIO_COMPLETION_STATUS_SHIFT 7
52 #define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
53 #define PIO_COMPLETION_STATUS_OK 0
54 #define PIO_COMPLETION_STATUS_UR 1
55 #define PIO_COMPLETION_STATUS_CRS 2
56 #define PIO_COMPLETION_STATUS_CA 4
57 #define PIO_NON_POSTED_REQ BIT(10)
58 #define PIO_ERR_STATUS BIT(11)
59 #define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
60 #define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
61 #define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
62 #define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
63 #define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
64 #define PIO_START (PIO_BASE_ADDR + 0x1c)
65 #define PIO_ISR (PIO_BASE_ADDR + 0x20)
66 #define PIO_ISRM (PIO_BASE_ADDR + 0x24)
68 /* Aardvark Control registers */
69 #define CONTROL_BASE_ADDR 0x4800
70 #define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
71 #define PCIE_GEN_SEL_MSK 0x3
72 #define PCIE_GEN_SEL_SHIFT 0x0
78 #define LANE_CNT_MSK 0x18
79 #define LANE_CNT_SHIFT 0x3
80 #define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
81 #define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
82 #define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
83 #define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
84 #define LINK_TRAINING_EN BIT(6)
85 #define LEGACY_INTA BIT(28)
86 #define LEGACY_INTB BIT(29)
87 #define LEGACY_INTC BIT(30)
88 #define LEGACY_INTD BIT(31)
89 #define PCIE_CORE_CTRL1_REG (CONTROL_BASE_ADDR + 0x4)
90 #define HOT_RESET_GEN BIT(0)
91 #define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
92 #define PCIE_CORE_CTRL2_RESERVED 0x7
93 #define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
94 #define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
95 #define PCIE_CORE_CTRL2_OB_WIN_ENABLE BIT(6)
96 #define PCIE_CORE_CTRL2_MSI_ENABLE BIT(10)
97 #define PCIE_CORE_REF_CLK_REG (CONTROL_BASE_ADDR + 0x14)
98 #define PCIE_CORE_REF_CLK_TX_ENABLE BIT(1)
99 #define PCIE_CORE_REF_CLK_RX_ENABLE BIT(2)
100 #define PCIE_MSG_LOG_REG (CONTROL_BASE_ADDR + 0x30)
101 #define PCIE_ISR0_REG (CONTROL_BASE_ADDR + 0x40)
102 #define PCIE_MSG_PM_PME_MASK BIT(7)
103 #define PCIE_ISR0_MASK_REG (CONTROL_BASE_ADDR + 0x44)
104 #define PCIE_ISR0_MSI_INT_PENDING BIT(24)
105 #define PCIE_ISR0_INTX_ASSERT(val) BIT(16 + (val))
106 #define PCIE_ISR0_INTX_DEASSERT(val) BIT(20 + (val))
107 #define PCIE_ISR0_ALL_MASK GENMASK(31, 0)
108 #define PCIE_ISR1_REG (CONTROL_BASE_ADDR + 0x48)
109 #define PCIE_ISR1_MASK_REG (CONTROL_BASE_ADDR + 0x4C)
110 #define PCIE_ISR1_POWER_STATE_CHANGE BIT(4)
111 #define PCIE_ISR1_FLUSH BIT(5)
112 #define PCIE_ISR1_INTX_ASSERT(val) BIT(8 + (val))
113 #define PCIE_ISR1_ALL_MASK GENMASK(31, 0)
114 #define PCIE_MSI_ADDR_LOW_REG (CONTROL_BASE_ADDR + 0x50)
115 #define PCIE_MSI_ADDR_HIGH_REG (CONTROL_BASE_ADDR + 0x54)
116 #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58)
117 #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C)
118 #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C)
119 #define PCIE_MSI_DATA_MASK GENMASK(15, 0)
121 /* PCIe window configuration */
122 #define OB_WIN_BASE_ADDR 0x4c00
123 #define OB_WIN_BLOCK_SIZE 0x20
124 #define OB_WIN_COUNT 8
125 #define OB_WIN_REG_ADDR(win, offset) (OB_WIN_BASE_ADDR + \
126 OB_WIN_BLOCK_SIZE * (win) + \
128 #define OB_WIN_MATCH_LS(win) OB_WIN_REG_ADDR(win, 0x00)
129 #define OB_WIN_ENABLE BIT(0)
130 #define OB_WIN_MATCH_MS(win) OB_WIN_REG_ADDR(win, 0x04)
131 #define OB_WIN_REMAP_LS(win) OB_WIN_REG_ADDR(win, 0x08)
132 #define OB_WIN_REMAP_MS(win) OB_WIN_REG_ADDR(win, 0x0c)
133 #define OB_WIN_MASK_LS(win) OB_WIN_REG_ADDR(win, 0x10)
134 #define OB_WIN_MASK_MS(win) OB_WIN_REG_ADDR(win, 0x14)
135 #define OB_WIN_ACTIONS(win) OB_WIN_REG_ADDR(win, 0x18)
136 #define OB_WIN_DEFAULT_ACTIONS (OB_WIN_ACTIONS(OB_WIN_COUNT-1) + 0x4)
137 #define OB_WIN_FUNC_NUM_MASK GENMASK(31, 24)
138 #define OB_WIN_FUNC_NUM_SHIFT 24
139 #define OB_WIN_FUNC_NUM_ENABLE BIT(23)
140 #define OB_WIN_BUS_NUM_BITS_MASK GENMASK(22, 20)
141 #define OB_WIN_BUS_NUM_BITS_SHIFT 20
142 #define OB_WIN_MSG_CODE_ENABLE BIT(22)
143 #define OB_WIN_MSG_CODE_MASK GENMASK(21, 14)
144 #define OB_WIN_MSG_CODE_SHIFT 14
145 #define OB_WIN_MSG_PAYLOAD_LEN BIT(12)
146 #define OB_WIN_ATTR_ENABLE BIT(11)
147 #define OB_WIN_ATTR_TC_MASK GENMASK(10, 8)
148 #define OB_WIN_ATTR_TC_SHIFT 8
149 #define OB_WIN_ATTR_RELAXED BIT(7)
150 #define OB_WIN_ATTR_NOSNOOP BIT(6)
151 #define OB_WIN_ATTR_POISON BIT(5)
152 #define OB_WIN_ATTR_IDO BIT(4)
153 #define OB_WIN_TYPE_MASK GENMASK(3, 0)
154 #define OB_WIN_TYPE_SHIFT 0
155 #define OB_WIN_TYPE_MEM 0x0
156 #define OB_WIN_TYPE_IO 0x4
157 #define OB_WIN_TYPE_CONFIG_TYPE0 0x8
158 #define OB_WIN_TYPE_CONFIG_TYPE1 0x9
159 #define OB_WIN_TYPE_MSG 0xc
161 /* LMI registers base address and register offsets */
162 #define LMI_BASE_ADDR 0x6000
163 #define CFG_REG (LMI_BASE_ADDR + 0x0)
164 #define LTSSM_SHIFT 24
165 #define LTSSM_MASK 0x3f
166 #define RC_BAR_CONFIG 0x300
168 /* LTSSM values in CFG_REG */
170 LTSSM_DETECT_QUIET = 0x0,
171 LTSSM_DETECT_ACTIVE = 0x1,
172 LTSSM_POLLING_ACTIVE = 0x2,
173 LTSSM_POLLING_COMPLIANCE = 0x3,
174 LTSSM_POLLING_CONFIGURATION = 0x4,
175 LTSSM_CONFIG_LINKWIDTH_START = 0x5,
176 LTSSM_CONFIG_LINKWIDTH_ACCEPT = 0x6,
177 LTSSM_CONFIG_LANENUM_ACCEPT = 0x7,
178 LTSSM_CONFIG_LANENUM_WAIT = 0x8,
179 LTSSM_CONFIG_COMPLETE = 0x9,
180 LTSSM_CONFIG_IDLE = 0xa,
181 LTSSM_RECOVERY_RCVR_LOCK = 0xb,
182 LTSSM_RECOVERY_SPEED = 0xc,
183 LTSSM_RECOVERY_RCVR_CFG = 0xd,
184 LTSSM_RECOVERY_IDLE = 0xe,
186 LTSSM_RX_L0S_ENTRY = 0x11,
187 LTSSM_RX_L0S_IDLE = 0x12,
188 LTSSM_RX_L0S_FTS = 0x13,
189 LTSSM_TX_L0S_ENTRY = 0x14,
190 LTSSM_TX_L0S_IDLE = 0x15,
191 LTSSM_TX_L0S_FTS = 0x16,
192 LTSSM_L1_ENTRY = 0x17,
193 LTSSM_L1_IDLE = 0x18,
194 LTSSM_L2_IDLE = 0x19,
195 LTSSM_L2_TRANSMIT_WAKE = 0x1a,
196 LTSSM_DISABLED = 0x20,
197 LTSSM_LOOPBACK_ENTRY_MASTER = 0x21,
198 LTSSM_LOOPBACK_ACTIVE_MASTER = 0x22,
199 LTSSM_LOOPBACK_EXIT_MASTER = 0x23,
200 LTSSM_LOOPBACK_ENTRY_SLAVE = 0x24,
201 LTSSM_LOOPBACK_ACTIVE_SLAVE = 0x25,
202 LTSSM_LOOPBACK_EXIT_SLAVE = 0x26,
203 LTSSM_HOT_RESET = 0x27,
204 LTSSM_RECOVERY_EQUALIZATION_PHASE0 = 0x28,
205 LTSSM_RECOVERY_EQUALIZATION_PHASE1 = 0x29,
206 LTSSM_RECOVERY_EQUALIZATION_PHASE2 = 0x2a,
207 LTSSM_RECOVERY_EQUALIZATION_PHASE3 = 0x2b,
210 #define VENDOR_ID_REG (LMI_BASE_ADDR + 0x44)
212 /* PCIe core controller registers */
213 #define CTRL_CORE_BASE_ADDR 0x18000
214 #define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
215 #define CTRL_MODE_SHIFT 0x0
216 #define CTRL_MODE_MASK 0x1
217 #define PCIE_CORE_MODE_DIRECT 0x0
218 #define PCIE_CORE_MODE_COMMAND 0x1
220 /* PCIe Central Interrupts Registers */
221 #define CENTRAL_INT_BASE_ADDR 0x1b000
222 #define HOST_CTRL_INT_STATUS_REG (CENTRAL_INT_BASE_ADDR + 0x0)
223 #define HOST_CTRL_INT_MASK_REG (CENTRAL_INT_BASE_ADDR + 0x4)
224 #define PCIE_IRQ_CMDQ_INT BIT(0)
225 #define PCIE_IRQ_MSI_STATUS_INT BIT(1)
226 #define PCIE_IRQ_CMD_SENT_DONE BIT(3)
227 #define PCIE_IRQ_DMA_INT BIT(4)
228 #define PCIE_IRQ_IB_DXFERDONE BIT(5)
229 #define PCIE_IRQ_OB_DXFERDONE BIT(6)
230 #define PCIE_IRQ_OB_RXFERDONE BIT(7)
231 #define PCIE_IRQ_COMPQ_INT BIT(12)
232 #define PCIE_IRQ_DIR_RD_DDR_DET BIT(13)
233 #define PCIE_IRQ_DIR_WR_DDR_DET BIT(14)
234 #define PCIE_IRQ_CORE_INT BIT(16)
235 #define PCIE_IRQ_CORE_INT_PIO BIT(17)
236 #define PCIE_IRQ_DPMU_INT BIT(18)
237 #define PCIE_IRQ_PCIE_MIS_INT BIT(19)
238 #define PCIE_IRQ_MSI_INT1_DET BIT(20)
239 #define PCIE_IRQ_MSI_INT2_DET BIT(21)
240 #define PCIE_IRQ_RC_DBELL_DET BIT(22)
241 #define PCIE_IRQ_EP_STATUS BIT(23)
242 #define PCIE_IRQ_ALL_MASK GENMASK(31, 0)
243 #define PCIE_IRQ_ENABLE_INTS_MASK PCIE_IRQ_CORE_INT
245 /* Transaction types */
246 #define PCIE_CONFIG_RD_TYPE0 0x8
247 #define PCIE_CONFIG_RD_TYPE1 0x9
248 #define PCIE_CONFIG_WR_TYPE0 0xa
249 #define PCIE_CONFIG_WR_TYPE1 0xb
251 #define PIO_RETRY_CNT 750000 /* 1.5 s */
252 #define PIO_RETRY_DELAY 2 /* 2 us*/
254 #define LINK_WAIT_MAX_RETRIES 10
255 #define LINK_WAIT_USLEEP_MIN 90000
256 #define LINK_WAIT_USLEEP_MAX 100000
257 #define RETRAIN_WAIT_MAX_RETRIES 10
258 #define RETRAIN_WAIT_USLEEP_US 2000
260 #define MSI_IRQ_NUM 32
262 #define CFG_RD_CRS_VAL 0xffff0001
265 struct platform_device *pdev;
272 } wins[OB_WIN_COUNT];
274 struct irq_domain *irq_domain;
275 struct irq_chip irq_chip;
276 raw_spinlock_t irq_lock;
277 struct irq_domain *msi_domain;
278 struct irq_domain *msi_inner_domain;
279 struct irq_chip msi_bottom_irq_chip;
280 struct irq_chip msi_irq_chip;
281 struct msi_domain_info msi_domain_info;
282 DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
283 struct mutex msi_used_lock;
286 struct pci_bridge_emul bridge;
287 struct gpio_desc *reset_gpio;
291 static inline void advk_writel(struct advk_pcie *pcie, u32 val, u64 reg)
293 writel(val, pcie->base + reg);
296 static inline u32 advk_readl(struct advk_pcie *pcie, u64 reg)
298 return readl(pcie->base + reg);
301 static u8 advk_pcie_ltssm_state(struct advk_pcie *pcie)
306 val = advk_readl(pcie, CFG_REG);
307 ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
311 static inline bool advk_pcie_link_up(struct advk_pcie *pcie)
313 /* check if LTSSM is in normal operation - some L* state */
314 u8 ltssm_state = advk_pcie_ltssm_state(pcie);
315 return ltssm_state >= LTSSM_L0 && ltssm_state < LTSSM_DISABLED;
318 static inline bool advk_pcie_link_active(struct advk_pcie *pcie)
321 * According to PCIe Base specification 3.0, Table 4-14: Link
322 * Status Mapped to the LTSSM, and 4.2.6.3.6 Configuration.Idle
323 * is Link Up mapped to LTSSM Configuration.Idle, Recovery, L0,
324 * L0s, L1 and L2 states. And according to 3.2.1. Data Link
325 * Control and Management State Machine Rules is DL Up status
326 * reported in DL Active state.
328 u8 ltssm_state = advk_pcie_ltssm_state(pcie);
329 return ltssm_state >= LTSSM_CONFIG_IDLE && ltssm_state < LTSSM_DISABLED;
332 static inline bool advk_pcie_link_training(struct advk_pcie *pcie)
335 * According to PCIe Base specification 3.0, Table 4-14: Link
336 * Status Mapped to the LTSSM is Link Training mapped to LTSSM
337 * Configuration and Recovery states.
339 u8 ltssm_state = advk_pcie_ltssm_state(pcie);
340 return ((ltssm_state >= LTSSM_CONFIG_LINKWIDTH_START &&
341 ltssm_state < LTSSM_L0) ||
342 (ltssm_state >= LTSSM_RECOVERY_EQUALIZATION_PHASE0 &&
343 ltssm_state <= LTSSM_RECOVERY_EQUALIZATION_PHASE3));
346 static int advk_pcie_wait_for_link(struct advk_pcie *pcie)
350 /* check if the link is up or not */
351 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
352 if (advk_pcie_link_up(pcie))
355 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
361 static void advk_pcie_wait_for_retrain(struct advk_pcie *pcie)
365 for (retries = 0; retries < RETRAIN_WAIT_MAX_RETRIES; ++retries) {
366 if (advk_pcie_link_training(pcie))
368 udelay(RETRAIN_WAIT_USLEEP_US);
372 static void advk_pcie_issue_perst(struct advk_pcie *pcie)
374 if (!pcie->reset_gpio)
377 /* 10ms delay is needed for some cards */
378 dev_info(&pcie->pdev->dev, "issuing PERST via reset GPIO for 10ms\n");
379 gpiod_set_value_cansleep(pcie->reset_gpio, 1);
380 usleep_range(10000, 11000);
381 gpiod_set_value_cansleep(pcie->reset_gpio, 0);
384 static void advk_pcie_train_link(struct advk_pcie *pcie)
386 struct device *dev = &pcie->pdev->dev;
391 * Setup PCIe rev / gen compliance based on device tree property
392 * 'max-link-speed' which also forces maximal link speed.
394 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
395 reg &= ~PCIE_GEN_SEL_MSK;
396 if (pcie->link_gen == 3)
398 else if (pcie->link_gen == 2)
402 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
405 * Set maximal link speed value also into PCIe Link Control 2 register.
406 * Armada 3700 Functional Specification says that default value is based
407 * on SPEED_GEN but tests showed that default value is always 8.0 GT/s.
409 reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_LNKCTL2);
410 reg &= ~PCI_EXP_LNKCTL2_TLS;
411 if (pcie->link_gen == 3)
412 reg |= PCI_EXP_LNKCTL2_TLS_8_0GT;
413 else if (pcie->link_gen == 2)
414 reg |= PCI_EXP_LNKCTL2_TLS_5_0GT;
416 reg |= PCI_EXP_LNKCTL2_TLS_2_5GT;
417 advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_LNKCTL2);
419 /* Enable link training after selecting PCIe generation */
420 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
421 reg |= LINK_TRAINING_EN;
422 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
425 * Reset PCIe card via PERST# signal. Some cards are not detected
426 * during link training when they are in some non-initial state.
428 advk_pcie_issue_perst(pcie);
431 * PERST# signal could have been asserted by pinctrl subsystem before
432 * probe() callback has been called or issued explicitly by reset gpio
433 * function advk_pcie_issue_perst(), making the endpoint going into
434 * fundamental reset. As required by PCI Express spec (PCI Express
435 * Base Specification, REV. 4.0 PCI Express, February 19 2014, 6.6.1
436 * Conventional Reset) a delay for at least 100ms after such a reset
437 * before sending a Configuration Request to the device is needed.
438 * So wait until PCIe link is up. Function advk_pcie_wait_for_link()
439 * waits for link at least 900ms.
441 ret = advk_pcie_wait_for_link(pcie);
443 dev_err(dev, "link never came up\n");
445 dev_info(dev, "link up\n");
449 * Set PCIe address window register which could be used for memory
452 static void advk_pcie_set_ob_win(struct advk_pcie *pcie, u8 win_num,
453 phys_addr_t match, phys_addr_t remap,
454 phys_addr_t mask, u32 actions)
456 advk_writel(pcie, OB_WIN_ENABLE |
457 lower_32_bits(match), OB_WIN_MATCH_LS(win_num));
458 advk_writel(pcie, upper_32_bits(match), OB_WIN_MATCH_MS(win_num));
459 advk_writel(pcie, lower_32_bits(remap), OB_WIN_REMAP_LS(win_num));
460 advk_writel(pcie, upper_32_bits(remap), OB_WIN_REMAP_MS(win_num));
461 advk_writel(pcie, lower_32_bits(mask), OB_WIN_MASK_LS(win_num));
462 advk_writel(pcie, upper_32_bits(mask), OB_WIN_MASK_MS(win_num));
463 advk_writel(pcie, actions, OB_WIN_ACTIONS(win_num));
466 static void advk_pcie_disable_ob_win(struct advk_pcie *pcie, u8 win_num)
468 advk_writel(pcie, 0, OB_WIN_MATCH_LS(win_num));
469 advk_writel(pcie, 0, OB_WIN_MATCH_MS(win_num));
470 advk_writel(pcie, 0, OB_WIN_REMAP_LS(win_num));
471 advk_writel(pcie, 0, OB_WIN_REMAP_MS(win_num));
472 advk_writel(pcie, 0, OB_WIN_MASK_LS(win_num));
473 advk_writel(pcie, 0, OB_WIN_MASK_MS(win_num));
474 advk_writel(pcie, 0, OB_WIN_ACTIONS(win_num));
477 static void advk_pcie_setup_hw(struct advk_pcie *pcie)
483 * Configure PCIe Reference clock. Direction is from the PCIe
484 * controller to the endpoint card, so enable transmitting of
485 * Reference clock differential signal off-chip and disable
486 * receiving off-chip differential signal.
488 reg = advk_readl(pcie, PCIE_CORE_REF_CLK_REG);
489 reg |= PCIE_CORE_REF_CLK_TX_ENABLE;
490 reg &= ~PCIE_CORE_REF_CLK_RX_ENABLE;
491 advk_writel(pcie, reg, PCIE_CORE_REF_CLK_REG);
493 /* Set to Direct mode */
494 reg = advk_readl(pcie, CTRL_CONFIG_REG);
495 reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
496 reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
497 advk_writel(pcie, reg, CTRL_CONFIG_REG);
499 /* Set PCI global control register to RC mode */
500 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
501 reg |= (IS_RC_MSK << IS_RC_SHIFT);
502 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
505 * Replace incorrect PCI vendor id value 0x1b4b by correct value 0x11ab.
506 * VENDOR_ID_REG contains vendor id in low 16 bits and subsystem vendor
507 * id in high 16 bits. Updating this register changes readback value of
508 * read-only vendor id bits in PCIE_CORE_DEV_ID_REG register. Workaround
509 * for erratum 4.1: "The value of device and vendor ID is incorrect".
511 reg = (PCI_VENDOR_ID_MARVELL << 16) | PCI_VENDOR_ID_MARVELL;
512 advk_writel(pcie, reg, VENDOR_ID_REG);
515 * Change Class Code of PCI Bridge device to PCI Bridge (0x600400),
516 * because the default value is Mass storage controller (0x010400).
518 * Note that this Aardvark PCI Bridge does not have compliant Type 1
519 * Configuration Space and it even cannot be accessed via Aardvark's
520 * PCI config space access method. Something like config space is
521 * available in internal Aardvark registers starting at offset 0x0
522 * and is reported as Type 0. In range 0x10 - 0x34 it has totally
523 * different registers.
525 * Therefore driver uses emulation of PCI Bridge which emulates
526 * access to configuration space via internal Aardvark registers or
527 * emulated configuration buffer.
529 reg = advk_readl(pcie, PCIE_CORE_DEV_REV_REG);
531 reg |= (PCI_CLASS_BRIDGE_PCI << 8) << 8;
532 advk_writel(pcie, reg, PCIE_CORE_DEV_REV_REG);
534 /* Disable Root Bridge I/O space, memory space and bus mastering */
535 reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
536 reg &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
537 advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
539 /* Set Advanced Error Capabilities and Control PF0 register */
540 reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
541 PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
542 PCIE_CORE_ERR_CAPCTL_ECRC_CHCK |
543 PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV;
544 advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
546 /* Set PCIe Device Control register */
547 reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL);
548 reg &= ~PCI_EXP_DEVCTL_RELAX_EN;
549 reg &= ~PCI_EXP_DEVCTL_NOSNOOP_EN;
550 reg &= ~PCI_EXP_DEVCTL_PAYLOAD;
551 reg &= ~PCI_EXP_DEVCTL_READRQ;
552 reg |= PCI_EXP_DEVCTL_PAYLOAD_512B;
553 reg |= PCI_EXP_DEVCTL_READRQ_512B;
554 advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL);
556 /* Program PCIe Control 2 to disable strict ordering */
557 reg = PCIE_CORE_CTRL2_RESERVED |
558 PCIE_CORE_CTRL2_TD_ENABLE;
559 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
562 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
563 reg &= ~LANE_CNT_MSK;
565 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
568 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
569 reg |= PCIE_CORE_CTRL2_MSI_ENABLE;
570 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
572 /* Clear all interrupts */
573 advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG);
574 advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
575 advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
577 /* Disable All ISR0/1 Sources */
578 reg = PCIE_ISR0_ALL_MASK;
579 reg &= ~PCIE_ISR0_MSI_INT_PENDING;
580 advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
582 advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);
584 /* Unmask all MSIs */
585 advk_writel(pcie, 0, PCIE_MSI_MASK_REG);
587 /* Enable summary interrupt for GIC SPI source */
588 reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK);
589 advk_writel(pcie, reg, HOST_CTRL_INT_MASK_REG);
592 * Enable AXI address window location generation:
593 * When it is enabled, the default outbound window
594 * configurations (Default User Field: 0xD0074CFC)
595 * are used to transparent address translation for
596 * the outbound transactions. Thus, PCIe address
597 * windows are not required for transparent memory
598 * access when default outbound window configuration
599 * is set for memory access.
601 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
602 reg |= PCIE_CORE_CTRL2_OB_WIN_ENABLE;
603 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
606 * Set memory access in Default User Field so it
607 * is not required to configure PCIe address for
608 * transparent memory access.
610 advk_writel(pcie, OB_WIN_TYPE_MEM, OB_WIN_DEFAULT_ACTIONS);
613 * Bypass the address window mapping for PIO:
614 * Since PIO access already contains all required
615 * info over AXI interface by PIO registers, the
616 * address window is not required.
618 reg = advk_readl(pcie, PIO_CTRL);
619 reg |= PIO_CTRL_ADDR_WIN_DISABLE;
620 advk_writel(pcie, reg, PIO_CTRL);
623 * Configure PCIe address windows for non-memory or
624 * non-transparent access as by default PCIe uses
625 * transparent memory access.
627 for (i = 0; i < pcie->wins_count; i++)
628 advk_pcie_set_ob_win(pcie, i,
629 pcie->wins[i].match, pcie->wins[i].remap,
630 pcie->wins[i].mask, pcie->wins[i].actions);
632 /* Disable remaining PCIe outbound windows */
633 for (i = pcie->wins_count; i < OB_WIN_COUNT; i++)
634 advk_pcie_disable_ob_win(pcie, i);
636 advk_pcie_train_link(pcie);
639 static int advk_pcie_check_pio_status(struct advk_pcie *pcie, bool allow_crs, u32 *val)
641 struct device *dev = &pcie->pdev->dev;
644 char *strcomp_status, *str_posted;
647 reg = advk_readl(pcie, PIO_STAT);
648 status = (reg & PIO_COMPLETION_STATUS_MASK) >>
649 PIO_COMPLETION_STATUS_SHIFT;
652 * According to HW spec, the PIO status check sequence as below:
653 * 1) even if COMPLETION_STATUS(bit9:7) indicates successful,
654 * it still needs to check Error Status(bit11), only when this bit
655 * indicates no error happen, the operation is successful.
656 * 2) value Unsupported Request(1) of COMPLETION_STATUS(bit9:7) only
657 * means a PIO write error, and for PIO read it is successful with
658 * a read value of 0xFFFFFFFF.
659 * 3) value Completion Retry Status(CRS) of COMPLETION_STATUS(bit9:7)
660 * only means a PIO write error, and for PIO read it is successful
661 * with a read value of 0xFFFF0001.
662 * 4) value Completer Abort (CA) of COMPLETION_STATUS(bit9:7) means
663 * error for both PIO read and PIO write operation.
664 * 5) other errors are indicated as 'unknown'.
667 case PIO_COMPLETION_STATUS_OK:
668 if (reg & PIO_ERR_STATUS) {
669 strcomp_status = "COMP_ERR";
673 /* Get the read result */
675 *val = advk_readl(pcie, PIO_RD_DATA);
677 strcomp_status = NULL;
680 case PIO_COMPLETION_STATUS_UR:
681 strcomp_status = "UR";
684 case PIO_COMPLETION_STATUS_CRS:
685 if (allow_crs && val) {
686 /* PCIe r4.0, sec 2.3.2, says:
687 * If CRS Software Visibility is enabled:
688 * For a Configuration Read Request that includes both
689 * bytes of the Vendor ID field of a device Function's
690 * Configuration Space Header, the Root Complex must
691 * complete the Request to the host by returning a
692 * read-data value of 0001h for the Vendor ID field and
693 * all '1's for any additional bytes included in the
696 * So CRS in this case is not an error status.
698 *val = CFG_RD_CRS_VAL;
699 strcomp_status = NULL;
703 /* PCIe r4.0, sec 2.3.2, says:
704 * If CRS Software Visibility is not enabled, the Root Complex
705 * must re-issue the Configuration Request as a new Request.
706 * If CRS Software Visibility is enabled: For a Configuration
707 * Write Request or for any other Configuration Read Request,
708 * the Root Complex must re-issue the Configuration Request as
710 * A Root Complex implementation may choose to limit the number
711 * of Configuration Request/CRS Completion Status loops before
712 * determining that something is wrong with the target of the
713 * Request and taking appropriate action, e.g., complete the
714 * Request to the host as a failed transaction.
716 * So return -EAGAIN and caller (pci-aardvark.c driver) will
717 * re-issue request again up to the PIO_RETRY_CNT retries.
719 strcomp_status = "CRS";
722 case PIO_COMPLETION_STATUS_CA:
723 strcomp_status = "CA";
727 strcomp_status = "Unknown";
735 if (reg & PIO_NON_POSTED_REQ)
736 str_posted = "Non-posted";
738 str_posted = "Posted";
740 dev_dbg(dev, "%s PIO Response Status: %s, %#x @ %#x\n",
741 str_posted, strcomp_status, reg, advk_readl(pcie, PIO_ADDR_LS));
746 static int advk_pcie_wait_pio(struct advk_pcie *pcie)
748 struct device *dev = &pcie->pdev->dev;
751 for (i = 1; i <= PIO_RETRY_CNT; i++) {
754 start = advk_readl(pcie, PIO_START);
755 isr = advk_readl(pcie, PIO_ISR);
758 udelay(PIO_RETRY_DELAY);
761 dev_err(dev, "PIO read/write transfer time out\n");
765 static pci_bridge_emul_read_status_t
766 advk_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge,
769 struct advk_pcie *pcie = bridge->data;
773 *value = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
774 return PCI_BRIDGE_EMUL_HANDLED;
776 case PCI_INTERRUPT_LINE: {
778 * From the whole 32bit register we support reading from HW only
779 * one bit: PCI_BRIDGE_CTL_BUS_RESET.
780 * Other bits are retrieved only from emulated config buffer.
782 __le32 *cfgspace = (__le32 *)&bridge->conf;
783 u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]);
784 if (advk_readl(pcie, PCIE_CORE_CTRL1_REG) & HOT_RESET_GEN)
785 val |= PCI_BRIDGE_CTL_BUS_RESET << 16;
787 val &= ~(PCI_BRIDGE_CTL_BUS_RESET << 16);
789 return PCI_BRIDGE_EMUL_HANDLED;
793 return PCI_BRIDGE_EMUL_NOT_HANDLED;
798 advk_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
799 int reg, u32 old, u32 new, u32 mask)
801 struct advk_pcie *pcie = bridge->data;
805 advk_writel(pcie, new, PCIE_CORE_CMD_STATUS_REG);
808 case PCI_INTERRUPT_LINE:
809 if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) {
810 u32 val = advk_readl(pcie, PCIE_CORE_CTRL1_REG);
811 if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16))
812 val |= HOT_RESET_GEN;
814 val &= ~HOT_RESET_GEN;
815 advk_writel(pcie, val, PCIE_CORE_CTRL1_REG);
824 static pci_bridge_emul_read_status_t
825 advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
828 struct advk_pcie *pcie = bridge->data;
833 *value = PCI_EXP_SLTSTA_PDS << 16;
834 return PCI_BRIDGE_EMUL_HANDLED;
836 case PCI_EXP_RTCTL: {
837 u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
838 *value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE;
839 *value |= le16_to_cpu(bridge->pcie_conf.rootctl) & PCI_EXP_RTCTL_CRSSVE;
840 *value |= PCI_EXP_RTCAP_CRSVIS << 16;
841 return PCI_BRIDGE_EMUL_HANDLED;
844 case PCI_EXP_RTSTA: {
845 u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG);
846 u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG);
847 *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16 | (msglog >> 16);
848 return PCI_BRIDGE_EMUL_HANDLED;
851 case PCI_EXP_LNKCAP: {
852 u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
854 * PCI_EXP_LNKCAP_DLLLARC bit is hardwired in aardvark HW to 0.
855 * But support for PCI_EXP_LNKSTA_DLLLA is emulated via ltssm
856 * state so explicitly enable PCI_EXP_LNKCAP_DLLLARC flag.
858 val |= PCI_EXP_LNKCAP_DLLLARC;
860 return PCI_BRIDGE_EMUL_HANDLED;
863 case PCI_EXP_LNKCTL: {
864 /* u32 contains both PCI_EXP_LNKCTL and PCI_EXP_LNKSTA */
865 u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg) &
866 ~(PCI_EXP_LNKSTA_LT << 16);
867 if (advk_pcie_link_training(pcie))
868 val |= (PCI_EXP_LNKSTA_LT << 16);
869 if (advk_pcie_link_active(pcie))
870 val |= (PCI_EXP_LNKSTA_DLLLA << 16);
872 return PCI_BRIDGE_EMUL_HANDLED;
877 *value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
878 return PCI_BRIDGE_EMUL_HANDLED;
880 return PCI_BRIDGE_EMUL_NOT_HANDLED;
886 advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
887 int reg, u32 old, u32 new, u32 mask)
889 struct advk_pcie *pcie = bridge->data;
893 advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
897 advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
898 if (new & PCI_EXP_LNKCTL_RL)
899 advk_pcie_wait_for_retrain(pcie);
902 case PCI_EXP_RTCTL: {
903 /* Only mask/unmask PME interrupt */
904 u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
905 ~PCIE_MSG_PM_PME_MASK;
906 if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
907 val |= PCIE_MSG_PM_PME_MASK;
908 advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
913 new = (new & PCI_EXP_RTSTA_PME) >> 9;
914 advk_writel(pcie, new, PCIE_ISR0_REG);
922 static struct pci_bridge_emul_ops advk_pci_bridge_emul_ops = {
923 .read_base = advk_pci_bridge_emul_base_conf_read,
924 .write_base = advk_pci_bridge_emul_base_conf_write,
925 .read_pcie = advk_pci_bridge_emul_pcie_conf_read,
926 .write_pcie = advk_pci_bridge_emul_pcie_conf_write,
930 * Initialize the configuration space of the PCI-to-PCI bridge
931 * associated with the given PCIe interface.
933 static int advk_sw_pci_bridge_init(struct advk_pcie *pcie)
935 struct pci_bridge_emul *bridge = &pcie->bridge;
937 bridge->conf.vendor =
938 cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff);
939 bridge->conf.device =
940 cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) >> 16);
941 bridge->conf.class_revision =
942 cpu_to_le32(advk_readl(pcie, PCIE_CORE_DEV_REV_REG) & 0xff);
944 /* Support 32 bits I/O addressing */
945 bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
946 bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
948 /* Support 64 bits memory pref */
949 bridge->conf.pref_mem_base = cpu_to_le16(PCI_PREF_RANGE_TYPE_64);
950 bridge->conf.pref_mem_limit = cpu_to_le16(PCI_PREF_RANGE_TYPE_64);
952 /* Support interrupt A for MSI feature */
953 bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE;
955 /* Aardvark HW provides PCIe Capability structure in version 2 */
956 bridge->pcie_conf.cap = cpu_to_le16(2);
958 /* Indicates supports for Completion Retry Status */
959 bridge->pcie_conf.rootcap = cpu_to_le16(PCI_EXP_RTCAP_CRSVIS);
961 bridge->has_pcie = true;
963 bridge->ops = &advk_pci_bridge_emul_ops;
965 return pci_bridge_emul_init(bridge, 0);
968 static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
971 if (pci_is_root_bus(bus) && PCI_SLOT(devfn) != 0)
975 * If the link goes down after we check for link-up, nothing bad
976 * happens but the config access times out.
978 if (!pci_is_root_bus(bus) && !advk_pcie_link_up(pcie))
984 static bool advk_pcie_pio_is_running(struct advk_pcie *pcie)
986 struct device *dev = &pcie->pdev->dev;
989 * Trying to start a new PIO transfer when previous has not completed
990 * cause External Abort on CPU which results in kernel panic:
992 * SError Interrupt on CPU0, code 0xbf000002 -- SError
993 * Kernel panic - not syncing: Asynchronous SError Interrupt
995 * Functions advk_pcie_rd_conf() and advk_pcie_wr_conf() are protected
996 * by raw_spin_lock_irqsave() at pci_lock_config() level to prevent
997 * concurrent calls at the same time. But because PIO transfer may take
998 * about 1.5s when link is down or card is disconnected, it means that
999 * advk_pcie_wait_pio() does not always have to wait for completion.
1001 * Some versions of ARM Trusted Firmware handles this External Abort at
1002 * EL3 level and mask it to prevent kernel panic. Relevant TF-A commit:
1003 * https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50
1005 if (advk_readl(pcie, PIO_START)) {
1006 dev_err(dev, "Previous PIO read/write transfer is still running\n");
1013 static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
1014 int where, int size, u32 *val)
1016 struct advk_pcie *pcie = bus->sysdata;
1022 if (!advk_pcie_valid_device(pcie, bus, devfn)) {
1024 return PCIBIOS_DEVICE_NOT_FOUND;
1027 if (pci_is_root_bus(bus))
1028 return pci_bridge_emul_conf_read(&pcie->bridge, where,
1032 * Completion Retry Status is possible to return only when reading all
1033 * 4 bytes from PCI_VENDOR_ID and PCI_DEVICE_ID registers at once and
1034 * CRSSVE flag on Root Bridge is enabled.
1036 allow_crs = (where == PCI_VENDOR_ID) && (size == 4) &&
1037 (le16_to_cpu(pcie->bridge.pcie_conf.rootctl) &
1038 PCI_EXP_RTCTL_CRSSVE);
1040 if (advk_pcie_pio_is_running(pcie))
1043 /* Program the control register */
1044 reg = advk_readl(pcie, PIO_CTRL);
1045 reg &= ~PIO_CTRL_TYPE_MASK;
1046 if (pci_is_root_bus(bus->parent))
1047 reg |= PCIE_CONFIG_RD_TYPE0;
1049 reg |= PCIE_CONFIG_RD_TYPE1;
1050 advk_writel(pcie, reg, PIO_CTRL);
1052 /* Program the address registers */
1053 reg = ALIGN_DOWN(PCIE_ECAM_OFFSET(bus->number, devfn, where), 4);
1054 advk_writel(pcie, reg, PIO_ADDR_LS);
1055 advk_writel(pcie, 0, PIO_ADDR_MS);
1057 /* Program the data strobe */
1058 advk_writel(pcie, 0xf, PIO_WR_DATA_STRB);
1062 /* Clear PIO DONE ISR and start the transfer */
1063 advk_writel(pcie, 1, PIO_ISR);
1064 advk_writel(pcie, 1, PIO_START);
1066 ret = advk_pcie_wait_pio(pcie);
1072 /* Check PIO status and get the read result */
1073 ret = advk_pcie_check_pio_status(pcie, allow_crs, val);
1074 } while (ret == -EAGAIN && retry_count < PIO_RETRY_CNT);
1080 *val = (*val >> (8 * (where & 3))) & 0xff;
1082 *val = (*val >> (8 * (where & 3))) & 0xffff;
1084 return PCIBIOS_SUCCESSFUL;
1088 * If it is possible, return Completion Retry Status so that caller
1089 * tries to issue the request again instead of failing.
1092 *val = CFG_RD_CRS_VAL;
1093 return PCIBIOS_SUCCESSFUL;
1098 return PCIBIOS_SET_FAILED;
1101 static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
1102 int where, int size, u32 val)
1104 struct advk_pcie *pcie = bus->sysdata;
1106 u32 data_strobe = 0x0;
1111 if (!advk_pcie_valid_device(pcie, bus, devfn))
1112 return PCIBIOS_DEVICE_NOT_FOUND;
1114 if (pci_is_root_bus(bus))
1115 return pci_bridge_emul_conf_write(&pcie->bridge, where,
1119 return PCIBIOS_SET_FAILED;
1121 if (advk_pcie_pio_is_running(pcie))
1122 return PCIBIOS_SET_FAILED;
1124 /* Program the control register */
1125 reg = advk_readl(pcie, PIO_CTRL);
1126 reg &= ~PIO_CTRL_TYPE_MASK;
1127 if (pci_is_root_bus(bus->parent))
1128 reg |= PCIE_CONFIG_WR_TYPE0;
1130 reg |= PCIE_CONFIG_WR_TYPE1;
1131 advk_writel(pcie, reg, PIO_CTRL);
1133 /* Program the address registers */
1134 reg = ALIGN_DOWN(PCIE_ECAM_OFFSET(bus->number, devfn, where), 4);
1135 advk_writel(pcie, reg, PIO_ADDR_LS);
1136 advk_writel(pcie, 0, PIO_ADDR_MS);
1138 /* Calculate the write strobe */
1139 offset = where & 0x3;
1140 reg = val << (8 * offset);
1141 data_strobe = GENMASK(size - 1, 0) << offset;
1143 /* Program the data register */
1144 advk_writel(pcie, reg, PIO_WR_DATA);
1146 /* Program the data strobe */
1147 advk_writel(pcie, data_strobe, PIO_WR_DATA_STRB);
1151 /* Clear PIO DONE ISR and start the transfer */
1152 advk_writel(pcie, 1, PIO_ISR);
1153 advk_writel(pcie, 1, PIO_START);
1155 ret = advk_pcie_wait_pio(pcie);
1157 return PCIBIOS_SET_FAILED;
1161 ret = advk_pcie_check_pio_status(pcie, false, NULL);
1162 } while (ret == -EAGAIN && retry_count < PIO_RETRY_CNT);
1164 return ret < 0 ? PCIBIOS_SET_FAILED : PCIBIOS_SUCCESSFUL;
1167 static struct pci_ops advk_pcie_ops = {
1168 .read = advk_pcie_rd_conf,
1169 .write = advk_pcie_wr_conf,
1172 static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
1173 struct msi_msg *msg)
1175 struct advk_pcie *pcie = irq_data_get_irq_chip_data(data);
1176 phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg);
1178 msg->address_lo = lower_32_bits(msi_msg);
1179 msg->address_hi = upper_32_bits(msi_msg);
1180 msg->data = data->irq;
1183 static int advk_msi_set_affinity(struct irq_data *irq_data,
1184 const struct cpumask *mask, bool force)
1189 static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
1191 unsigned int nr_irqs, void *args)
1193 struct advk_pcie *pcie = domain->host_data;
1196 mutex_lock(&pcie->msi_used_lock);
1197 hwirq = bitmap_find_next_zero_area(pcie->msi_used, MSI_IRQ_NUM,
1199 if (hwirq >= MSI_IRQ_NUM) {
1200 mutex_unlock(&pcie->msi_used_lock);
1204 bitmap_set(pcie->msi_used, hwirq, nr_irqs);
1205 mutex_unlock(&pcie->msi_used_lock);
1207 for (i = 0; i < nr_irqs; i++)
1208 irq_domain_set_info(domain, virq + i, hwirq + i,
1209 &pcie->msi_bottom_irq_chip,
1210 domain->host_data, handle_simple_irq,
1216 static void advk_msi_irq_domain_free(struct irq_domain *domain,
1217 unsigned int virq, unsigned int nr_irqs)
1219 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
1220 struct advk_pcie *pcie = domain->host_data;
1222 mutex_lock(&pcie->msi_used_lock);
1223 bitmap_clear(pcie->msi_used, d->hwirq, nr_irqs);
1224 mutex_unlock(&pcie->msi_used_lock);
1227 static const struct irq_domain_ops advk_msi_domain_ops = {
1228 .alloc = advk_msi_irq_domain_alloc,
1229 .free = advk_msi_irq_domain_free,
1232 static void advk_pcie_irq_mask(struct irq_data *d)
1234 struct advk_pcie *pcie = d->domain->host_data;
1235 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1236 unsigned long flags;
1239 raw_spin_lock_irqsave(&pcie->irq_lock, flags);
1240 mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
1241 mask |= PCIE_ISR1_INTX_ASSERT(hwirq);
1242 advk_writel(pcie, mask, PCIE_ISR1_MASK_REG);
1243 raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
1246 static void advk_pcie_irq_unmask(struct irq_data *d)
1248 struct advk_pcie *pcie = d->domain->host_data;
1249 irq_hw_number_t hwirq = irqd_to_hwirq(d);
1250 unsigned long flags;
1253 raw_spin_lock_irqsave(&pcie->irq_lock, flags);
1254 mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
1255 mask &= ~PCIE_ISR1_INTX_ASSERT(hwirq);
1256 advk_writel(pcie, mask, PCIE_ISR1_MASK_REG);
1257 raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
1260 static int advk_pcie_irq_map(struct irq_domain *h,
1261 unsigned int virq, irq_hw_number_t hwirq)
1263 struct advk_pcie *pcie = h->host_data;
1265 advk_pcie_irq_mask(irq_get_irq_data(virq));
1266 irq_set_status_flags(virq, IRQ_LEVEL);
1267 irq_set_chip_and_handler(virq, &pcie->irq_chip,
1269 irq_set_chip_data(virq, pcie);
1274 static const struct irq_domain_ops advk_pcie_irq_domain_ops = {
1275 .map = advk_pcie_irq_map,
1276 .xlate = irq_domain_xlate_onecell,
1279 static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
1281 struct device *dev = &pcie->pdev->dev;
1282 struct device_node *node = dev->of_node;
1283 struct irq_chip *bottom_ic, *msi_ic;
1284 struct msi_domain_info *msi_di;
1285 phys_addr_t msi_msg_phys;
1287 mutex_init(&pcie->msi_used_lock);
1289 bottom_ic = &pcie->msi_bottom_irq_chip;
1291 bottom_ic->name = "MSI";
1292 bottom_ic->irq_compose_msi_msg = advk_msi_irq_compose_msi_msg;
1293 bottom_ic->irq_set_affinity = advk_msi_set_affinity;
1295 msi_ic = &pcie->msi_irq_chip;
1296 msi_ic->name = "advk-MSI";
1298 msi_di = &pcie->msi_domain_info;
1299 msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
1300 MSI_FLAG_MULTI_PCI_MSI;
1301 msi_di->chip = msi_ic;
1303 msi_msg_phys = virt_to_phys(&pcie->msi_msg);
1305 advk_writel(pcie, lower_32_bits(msi_msg_phys),
1306 PCIE_MSI_ADDR_LOW_REG);
1307 advk_writel(pcie, upper_32_bits(msi_msg_phys),
1308 PCIE_MSI_ADDR_HIGH_REG);
1310 pcie->msi_inner_domain =
1311 irq_domain_add_linear(NULL, MSI_IRQ_NUM,
1312 &advk_msi_domain_ops, pcie);
1313 if (!pcie->msi_inner_domain)
1317 pci_msi_create_irq_domain(of_node_to_fwnode(node),
1318 msi_di, pcie->msi_inner_domain);
1319 if (!pcie->msi_domain) {
1320 irq_domain_remove(pcie->msi_inner_domain);
1327 static void advk_pcie_remove_msi_irq_domain(struct advk_pcie *pcie)
1329 irq_domain_remove(pcie->msi_domain);
1330 irq_domain_remove(pcie->msi_inner_domain);
1333 static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
1335 struct device *dev = &pcie->pdev->dev;
1336 struct device_node *node = dev->of_node;
1337 struct device_node *pcie_intc_node;
1338 struct irq_chip *irq_chip;
1341 raw_spin_lock_init(&pcie->irq_lock);
1343 pcie_intc_node = of_get_next_child(node, NULL);
1344 if (!pcie_intc_node) {
1345 dev_err(dev, "No PCIe Intc node found\n");
1349 irq_chip = &pcie->irq_chip;
1351 irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq",
1353 if (!irq_chip->name) {
1358 irq_chip->irq_mask = advk_pcie_irq_mask;
1359 irq_chip->irq_mask_ack = advk_pcie_irq_mask;
1360 irq_chip->irq_unmask = advk_pcie_irq_unmask;
1363 irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
1364 &advk_pcie_irq_domain_ops, pcie);
1365 if (!pcie->irq_domain) {
1366 dev_err(dev, "Failed to get a INTx IRQ domain\n");
1372 of_node_put(pcie_intc_node);
1376 static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
1378 irq_domain_remove(pcie->irq_domain);
1381 static void advk_pcie_handle_msi(struct advk_pcie *pcie)
1383 u32 msi_val, msi_mask, msi_status, msi_idx;
1386 msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
1387 msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG);
1388 msi_status = msi_val & ~msi_mask;
1390 for (msi_idx = 0; msi_idx < MSI_IRQ_NUM; msi_idx++) {
1391 if (!(BIT(msi_idx) & msi_status))
1395 * msi_idx contains bits [4:0] of the msi_data and msi_data
1396 * contains 16bit MSI interrupt number
1398 advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG);
1399 msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & PCIE_MSI_DATA_MASK;
1400 generic_handle_irq(msi_data);
1403 advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING,
1407 static void advk_pcie_handle_int(struct advk_pcie *pcie)
1409 u32 isr0_val, isr0_mask, isr0_status;
1410 u32 isr1_val, isr1_mask, isr1_status;
1413 isr0_val = advk_readl(pcie, PCIE_ISR0_REG);
1414 isr0_mask = advk_readl(pcie, PCIE_ISR0_MASK_REG);
1415 isr0_status = isr0_val & ((~isr0_mask) & PCIE_ISR0_ALL_MASK);
1417 isr1_val = advk_readl(pcie, PCIE_ISR1_REG);
1418 isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
1419 isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
1421 /* Process MSI interrupts */
1422 if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
1423 advk_pcie_handle_msi(pcie);
1425 /* Process legacy interrupts */
1426 for (i = 0; i < PCI_NUM_INTX; i++) {
1427 if (!(isr1_status & PCIE_ISR1_INTX_ASSERT(i)))
1430 advk_writel(pcie, PCIE_ISR1_INTX_ASSERT(i),
1433 generic_handle_domain_irq(pcie->irq_domain, i);
1437 static irqreturn_t advk_pcie_irq_handler(int irq, void *arg)
1439 struct advk_pcie *pcie = arg;
1442 status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
1443 if (!(status & PCIE_IRQ_CORE_INT))
1446 advk_pcie_handle_int(pcie);
1448 /* Clear interrupt */
1449 advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
1454 static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie)
1456 phy_power_off(pcie->phy);
1457 phy_exit(pcie->phy);
1460 static int advk_pcie_enable_phy(struct advk_pcie *pcie)
1467 ret = phy_init(pcie->phy);
1471 ret = phy_set_mode(pcie->phy, PHY_MODE_PCIE);
1473 phy_exit(pcie->phy);
1477 ret = phy_power_on(pcie->phy);
1478 if (ret == -EOPNOTSUPP) {
1479 dev_warn(&pcie->pdev->dev, "PHY unsupported by firmware\n");
1481 phy_exit(pcie->phy);
1488 static int advk_pcie_setup_phy(struct advk_pcie *pcie)
1490 struct device *dev = &pcie->pdev->dev;
1491 struct device_node *node = dev->of_node;
1494 pcie->phy = devm_of_phy_get(dev, node, NULL);
1495 if (IS_ERR(pcie->phy) && (PTR_ERR(pcie->phy) == -EPROBE_DEFER))
1496 return PTR_ERR(pcie->phy);
1498 /* Old bindings miss the PHY handle */
1499 if (IS_ERR(pcie->phy)) {
1500 dev_warn(dev, "PHY unavailable (%ld)\n", PTR_ERR(pcie->phy));
1505 ret = advk_pcie_enable_phy(pcie);
1507 dev_err(dev, "Failed to initialize PHY (%d)\n", ret);
1512 static int advk_pcie_probe(struct platform_device *pdev)
1514 struct device *dev = &pdev->dev;
1515 struct advk_pcie *pcie;
1516 struct pci_host_bridge *bridge;
1517 struct resource_entry *entry;
1520 bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie));
1524 pcie = pci_host_bridge_priv(bridge);
1526 platform_set_drvdata(pdev, pcie);
1528 resource_list_for_each_entry(entry, &bridge->windows) {
1529 resource_size_t start = entry->res->start;
1530 resource_size_t size = resource_size(entry->res);
1531 unsigned long type = resource_type(entry->res);
1535 * Aardvark hardware allows to configure also PCIe window
1536 * for config type 0 and type 1 mapping, but driver uses
1537 * only PIO for issuing configuration transfers which does
1538 * not use PCIe window configuration.
1540 if (type != IORESOURCE_MEM && type != IORESOURCE_IO)
1544 * Skip transparent memory resources. Default outbound access
1545 * configuration is set to transparent memory access so it
1546 * does not need window configuration.
1548 if (type == IORESOURCE_MEM && entry->offset == 0)
1552 * The n-th PCIe window is configured by tuple (match, remap, mask)
1553 * and an access to address A uses this window if A matches the
1554 * match with given mask.
1555 * So every PCIe window size must be a power of two and every start
1556 * address must be aligned to window size. Minimal size is 64 KiB
1557 * because lower 16 bits of mask must be zero. Remapped address
1558 * may have set only bits from the mask.
1560 while (pcie->wins_count < OB_WIN_COUNT && size > 0) {
1561 /* Calculate the largest aligned window size */
1562 win_size = (1ULL << (fls64(size)-1)) |
1563 (start ? (1ULL << __ffs64(start)) : 0);
1564 win_size = 1ULL << __ffs64(win_size);
1565 if (win_size < 0x10000)
1569 "Configuring PCIe window %d: [0x%llx-0x%llx] as %lu\n",
1570 pcie->wins_count, (unsigned long long)start,
1571 (unsigned long long)start + win_size, type);
1573 if (type == IORESOURCE_IO) {
1574 pcie->wins[pcie->wins_count].actions = OB_WIN_TYPE_IO;
1575 pcie->wins[pcie->wins_count].match = pci_pio_to_address(start);
1577 pcie->wins[pcie->wins_count].actions = OB_WIN_TYPE_MEM;
1578 pcie->wins[pcie->wins_count].match = start;
1580 pcie->wins[pcie->wins_count].remap = start - entry->offset;
1581 pcie->wins[pcie->wins_count].mask = ~(win_size - 1);
1583 if (pcie->wins[pcie->wins_count].remap & (win_size - 1))
1592 dev_err(&pcie->pdev->dev,
1593 "Invalid PCIe region [0x%llx-0x%llx]\n",
1594 (unsigned long long)entry->res->start,
1595 (unsigned long long)entry->res->end + 1);
1600 pcie->base = devm_platform_ioremap_resource(pdev, 0);
1601 if (IS_ERR(pcie->base))
1602 return PTR_ERR(pcie->base);
1604 irq = platform_get_irq(pdev, 0);
1608 ret = devm_request_irq(dev, irq, advk_pcie_irq_handler,
1609 IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie",
1612 dev_err(dev, "Failed to register interrupt\n");
1616 pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node,
1620 ret = PTR_ERR_OR_ZERO(pcie->reset_gpio);
1622 if (ret == -ENOENT) {
1623 pcie->reset_gpio = NULL;
1625 if (ret != -EPROBE_DEFER)
1626 dev_err(dev, "Failed to get reset-gpio: %i\n",
1632 ret = of_pci_get_max_link_speed(dev->of_node);
1633 if (ret <= 0 || ret > 3)
1636 pcie->link_gen = ret;
1638 ret = advk_pcie_setup_phy(pcie);
1642 advk_pcie_setup_hw(pcie);
1644 ret = advk_sw_pci_bridge_init(pcie);
1646 dev_err(dev, "Failed to register emulated root PCI bridge\n");
1650 ret = advk_pcie_init_irq_domain(pcie);
1652 dev_err(dev, "Failed to initialize irq\n");
1656 ret = advk_pcie_init_msi_irq_domain(pcie);
1658 dev_err(dev, "Failed to initialize irq\n");
1659 advk_pcie_remove_irq_domain(pcie);
1663 bridge->sysdata = pcie;
1664 bridge->ops = &advk_pcie_ops;
1666 ret = pci_host_probe(bridge);
1668 advk_pcie_remove_msi_irq_domain(pcie);
1669 advk_pcie_remove_irq_domain(pcie);
1676 static int advk_pcie_remove(struct platform_device *pdev)
1678 struct advk_pcie *pcie = platform_get_drvdata(pdev);
1679 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
1682 pci_lock_rescan_remove();
1683 pci_stop_root_bus(bridge->bus);
1684 pci_remove_root_bus(bridge->bus);
1685 pci_unlock_rescan_remove();
1687 advk_pcie_remove_msi_irq_domain(pcie);
1688 advk_pcie_remove_irq_domain(pcie);
1690 /* Disable outbound address windows mapping */
1691 for (i = 0; i < OB_WIN_COUNT; i++)
1692 advk_pcie_disable_ob_win(pcie, i);
1697 static const struct of_device_id advk_pcie_of_match_table[] = {
1698 { .compatible = "marvell,armada-3700-pcie", },
1701 MODULE_DEVICE_TABLE(of, advk_pcie_of_match_table);
1703 static struct platform_driver advk_pcie_driver = {
1705 .name = "advk-pcie",
1706 .of_match_table = advk_pcie_of_match_table,
1708 .probe = advk_pcie_probe,
1709 .remove = advk_pcie_remove,
1711 module_platform_driver(advk_pcie_driver);
1713 MODULE_DESCRIPTION("Aardvark PCIe controller");
1714 MODULE_LICENSE("GPL v2");