1 // SPDX-License-Identifier: GPL-2.0
3 * PCIe host controller driver for Freescale i.MX6 SoCs
5 * Copyright (C) 2013 Kosagi
6 * https://www.kosagi.com
8 * Author: Sean Cross <xobs@kosagi.com>
11 #include <linux/bitfield.h>
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/gpio.h>
15 #include <linux/kernel.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
18 #include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
19 #include <linux/module.h>
20 #include <linux/of_gpio.h>
21 #include <linux/of_device.h>
22 #include <linux/of_address.h>
23 #include <linux/pci.h>
24 #include <linux/platform_device.h>
25 #include <linux/regmap.h>
26 #include <linux/regulator/consumer.h>
27 #include <linux/resource.h>
28 #include <linux/signal.h>
29 #include <linux/types.h>
30 #include <linux/interrupt.h>
31 #include <linux/reset.h>
32 #include <linux/phy/phy.h>
33 #include <linux/pm_domain.h>
34 #include <linux/pm_runtime.h>
36 #include "pcie-designware.h"
38 #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
39 #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
40 #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
41 #define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12)
42 #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
43 #define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000
45 #define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
47 enum imx6_pcie_variants {
56 #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
57 #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE BIT(1)
58 #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND BIT(2)
60 struct imx6_pcie_drvdata {
61 enum imx6_pcie_variants variant;
69 bool gpio_active_high;
73 struct clk *pcie_inbound_axi;
76 struct regmap *iomuxc_gpr;
78 struct reset_control *pciephy_reset;
79 struct reset_control *apps_reset;
80 struct reset_control *turnoff_reset;
82 u32 tx_deemph_gen2_3p5db;
83 u32 tx_deemph_gen2_6db;
86 struct regulator *vpcie;
87 struct regulator *vph;
88 void __iomem *phy_base;
90 /* power domain for pcie */
91 struct device *pd_pcie;
92 /* power domain for pcie phy */
93 struct device *pd_pcie_phy;
95 const struct imx6_pcie_drvdata *drvdata;
98 /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
99 #define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200
100 #define PHY_PLL_LOCK_WAIT_TIMEOUT (2000 * PHY_PLL_LOCK_WAIT_USLEEP_MAX)
102 /* PCIe Port Logic registers (memory-mapped) */
103 #define PL_OFFSET 0x700
105 #define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
106 #define PCIE_PHY_CTRL_DATA(x) FIELD_PREP(GENMASK(15, 0), (x))
107 #define PCIE_PHY_CTRL_CAP_ADR BIT(16)
108 #define PCIE_PHY_CTRL_CAP_DAT BIT(17)
109 #define PCIE_PHY_CTRL_WR BIT(18)
110 #define PCIE_PHY_CTRL_RD BIT(19)
112 #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
113 #define PCIE_PHY_STAT_ACK BIT(16)
115 /* PHY registers (not memory-mapped) */
116 #define PCIE_PHY_ATEOVRD 0x10
117 #define PCIE_PHY_ATEOVRD_EN BIT(2)
118 #define PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT 0
119 #define PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK 0x1
121 #define PCIE_PHY_MPLL_OVRD_IN_LO 0x11
122 #define PCIE_PHY_MPLL_MULTIPLIER_SHIFT 2
123 #define PCIE_PHY_MPLL_MULTIPLIER_MASK 0x7f
124 #define PCIE_PHY_MPLL_MULTIPLIER_OVRD BIT(9)
126 #define PCIE_PHY_RX_ASIC_OUT 0x100D
127 #define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
129 /* iMX7 PCIe PHY registers */
130 #define PCIE_PHY_CMN_REG4 0x14
131 /* These are probably the bits that *aren't* DCC_FB_EN */
132 #define PCIE_PHY_CMN_REG4_DCC_FB_EN 0x29
134 #define PCIE_PHY_CMN_REG15 0x54
135 #define PCIE_PHY_CMN_REG15_DLY_4 BIT(2)
136 #define PCIE_PHY_CMN_REG15_PLL_PD BIT(5)
137 #define PCIE_PHY_CMN_REG15_OVRD_PLL_PD BIT(7)
139 #define PCIE_PHY_CMN_REG24 0x90
140 #define PCIE_PHY_CMN_REG24_RX_EQ BIT(6)
141 #define PCIE_PHY_CMN_REG24_RX_EQ_SEL BIT(3)
143 #define PCIE_PHY_CMN_REG26 0x98
144 #define PCIE_PHY_CMN_REG26_ATT_MODE 0xBC
146 #define PHY_RX_OVRD_IN_LO 0x1005
147 #define PHY_RX_OVRD_IN_LO_RX_DATA_EN BIT(5)
148 #define PHY_RX_OVRD_IN_LO_RX_PLL_EN BIT(3)
150 static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
152 WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ &&
153 imx6_pcie->drvdata->variant != IMX8MM);
154 return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
157 static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
159 unsigned int mask, val;
161 if (imx6_pcie->drvdata->variant == IMX8MQ &&
162 imx6_pcie->controller_id == 1) {
163 mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
164 val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
165 PCI_EXP_TYPE_ROOT_PORT);
167 mask = IMX6Q_GPR12_DEVICE_TYPE;
168 val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE,
169 PCI_EXP_TYPE_ROOT_PORT);
172 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
175 static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
177 struct dw_pcie *pci = imx6_pcie->pci;
179 u32 max_iterations = 10;
180 u32 wait_counter = 0;
183 val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT) &
191 } while (wait_counter < max_iterations);
196 static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
198 struct dw_pcie *pci = imx6_pcie->pci;
202 val = PCIE_PHY_CTRL_DATA(addr);
203 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
205 val |= PCIE_PHY_CTRL_CAP_ADR;
206 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
208 ret = pcie_phy_poll_ack(imx6_pcie, true);
212 val = PCIE_PHY_CTRL_DATA(addr);
213 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
215 return pcie_phy_poll_ack(imx6_pcie, false);
218 /* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
219 static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, u16 *data)
221 struct dw_pcie *pci = imx6_pcie->pci;
225 ret = pcie_phy_wait_ack(imx6_pcie, addr);
229 /* assert Read signal */
230 phy_ctl = PCIE_PHY_CTRL_RD;
231 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, phy_ctl);
233 ret = pcie_phy_poll_ack(imx6_pcie, true);
237 *data = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
239 /* deassert Read signal */
240 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x00);
242 return pcie_phy_poll_ack(imx6_pcie, false);
245 static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, u16 data)
247 struct dw_pcie *pci = imx6_pcie->pci;
253 ret = pcie_phy_wait_ack(imx6_pcie, addr);
257 var = PCIE_PHY_CTRL_DATA(data);
258 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
261 var |= PCIE_PHY_CTRL_CAP_DAT;
262 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
264 ret = pcie_phy_poll_ack(imx6_pcie, true);
268 /* deassert cap data */
269 var = PCIE_PHY_CTRL_DATA(data);
270 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
272 /* wait for ack de-assertion */
273 ret = pcie_phy_poll_ack(imx6_pcie, false);
277 /* assert wr signal */
278 var = PCIE_PHY_CTRL_WR;
279 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
282 ret = pcie_phy_poll_ack(imx6_pcie, true);
286 /* deassert wr signal */
287 var = PCIE_PHY_CTRL_DATA(data);
288 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
290 /* wait for ack de-assertion */
291 ret = pcie_phy_poll_ack(imx6_pcie, false);
295 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x0);
300 static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
302 switch (imx6_pcie->drvdata->variant) {
305 * The PHY initialization had been done in the PHY
306 * driver, break here directly.
311 * TODO: Currently this code assumes external
312 * oscillator is being used
314 regmap_update_bits(imx6_pcie->iomuxc_gpr,
315 imx6_pcie_grp_offset(imx6_pcie),
316 IMX8MQ_GPR_PCIE_REF_USE_PAD,
317 IMX8MQ_GPR_PCIE_REF_USE_PAD);
319 * Regarding the datasheet, the PCIE_VPH is suggested
320 * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
321 * VREG_BYPASS should be cleared to zero.
323 if (imx6_pcie->vph &&
324 regulator_get_voltage(imx6_pcie->vph) > 3000000)
325 regmap_update_bits(imx6_pcie->iomuxc_gpr,
326 imx6_pcie_grp_offset(imx6_pcie),
327 IMX8MQ_GPR_PCIE_VREG_BYPASS,
331 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
332 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
335 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
336 IMX6SX_GPR12_PCIE_RX_EQ_MASK,
337 IMX6SX_GPR12_PCIE_RX_EQ_2);
340 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
341 IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
343 /* configure constant input signal to the pcie ctrl and phy */
344 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
345 IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
347 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
348 IMX6Q_GPR8_TX_DEEMPH_GEN1,
349 imx6_pcie->tx_deemph_gen1 << 0);
350 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
351 IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
352 imx6_pcie->tx_deemph_gen2_3p5db << 6);
353 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
354 IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
355 imx6_pcie->tx_deemph_gen2_6db << 12);
356 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
357 IMX6Q_GPR8_TX_SWING_FULL,
358 imx6_pcie->tx_swing_full << 18);
359 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
360 IMX6Q_GPR8_TX_SWING_LOW,
361 imx6_pcie->tx_swing_low << 25);
365 imx6_pcie_configure_type(imx6_pcie);
368 static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
371 struct device *dev = imx6_pcie->pci->dev;
373 if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
375 val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
376 PHY_PLL_LOCK_WAIT_USLEEP_MAX,
377 PHY_PLL_LOCK_WAIT_TIMEOUT))
378 dev_err(dev, "PCIe PLL lock timeout\n");
381 static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
383 unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
387 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
393 * The default settings of the MPLL are for a 125MHz input
394 * clock, so no need to reconfigure anything in that case.
406 dev_err(imx6_pcie->pci->dev,
407 "Unsupported PHY reference clock rate %lu\n", phy_rate);
411 pcie_phy_read(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, &val);
412 val &= ~(PCIE_PHY_MPLL_MULTIPLIER_MASK <<
413 PCIE_PHY_MPLL_MULTIPLIER_SHIFT);
414 val |= mult << PCIE_PHY_MPLL_MULTIPLIER_SHIFT;
415 val |= PCIE_PHY_MPLL_MULTIPLIER_OVRD;
416 pcie_phy_write(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, val);
418 pcie_phy_read(imx6_pcie, PCIE_PHY_ATEOVRD, &val);
419 val &= ~(PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK <<
420 PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT);
421 val |= div << PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT;
422 val |= PCIE_PHY_ATEOVRD_EN;
423 pcie_phy_write(imx6_pcie, PCIE_PHY_ATEOVRD, val);
428 static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
432 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
435 pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
436 tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
437 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
438 pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
440 usleep_range(2000, 3000);
442 pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
443 tmp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
444 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
445 pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
449 /* Added for PCI abort handling */
450 static int imx6q_pcie_abort_handler(unsigned long addr,
451 unsigned int fsr, struct pt_regs *regs)
453 unsigned long pc = instruction_pointer(regs);
454 unsigned long instr = *(unsigned long *)pc;
455 int reg = (instr >> 12) & 15;
458 * If the instruction being executed was a read,
459 * make it look like it read all-ones.
461 if ((instr & 0x0c100000) == 0x04100000) {
464 if (instr & 0x00400000)
469 regs->uregs[reg] = val;
474 if ((instr & 0x0e100090) == 0x00100090) {
475 regs->uregs[reg] = -1;
484 static int imx6_pcie_attach_pd(struct device *dev)
486 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
487 struct device_link *link;
489 /* Do nothing when in a single power domain */
493 imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
494 if (IS_ERR(imx6_pcie->pd_pcie))
495 return PTR_ERR(imx6_pcie->pd_pcie);
496 /* Do nothing when power domain missing */
497 if (!imx6_pcie->pd_pcie)
499 link = device_link_add(dev, imx6_pcie->pd_pcie,
504 dev_err(dev, "Failed to add device_link to pcie pd.\n");
508 imx6_pcie->pd_pcie_phy = dev_pm_domain_attach_by_name(dev, "pcie_phy");
509 if (IS_ERR(imx6_pcie->pd_pcie_phy))
510 return PTR_ERR(imx6_pcie->pd_pcie_phy);
512 link = device_link_add(dev, imx6_pcie->pd_pcie_phy,
517 dev_err(dev, "Failed to add device_link to pcie_phy pd.\n");
524 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
526 struct dw_pcie *pci = imx6_pcie->pci;
527 struct device *dev = pci->dev;
531 switch (imx6_pcie->drvdata->variant) {
533 ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
535 dev_err(dev, "unable to enable pcie_axi clock\n");
539 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
540 IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
544 /* power up core phy and enable ref clock */
545 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
546 IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
548 * the async reset input need ref clock to sync internally,
549 * when the ref clock comes after reset, internal synced
550 * reset time is too short, cannot meet the requirement.
551 * add one ~10us delay here.
553 usleep_range(10, 100);
554 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
555 IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
561 ret = clk_prepare_enable(imx6_pcie->pcie_aux);
563 dev_err(dev, "unable to enable pcie_aux clock\n");
567 offset = imx6_pcie_grp_offset(imx6_pcie);
569 * Set the over ride low and enabled
570 * make sure that REF_CLK is turned on.
572 regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
573 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
575 regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
576 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
577 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
584 static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
586 switch (imx6_pcie->drvdata->variant) {
588 clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
592 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
593 IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
594 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
595 IMX6Q_GPR1_PCIE_TEST_PD,
596 IMX6Q_GPR1_PCIE_TEST_PD);
599 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
600 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
601 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
605 clk_disable_unprepare(imx6_pcie->pcie_aux);
612 static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
614 struct dw_pcie *pci = imx6_pcie->pci;
615 struct device *dev = pci->dev;
618 ret = clk_prepare_enable(imx6_pcie->pcie_phy);
620 dev_err(dev, "unable to enable pcie_phy clock\n");
624 ret = clk_prepare_enable(imx6_pcie->pcie_bus);
626 dev_err(dev, "unable to enable pcie_bus clock\n");
630 ret = clk_prepare_enable(imx6_pcie->pcie);
632 dev_err(dev, "unable to enable pcie clock\n");
636 ret = imx6_pcie_enable_ref_clk(imx6_pcie);
638 dev_err(dev, "unable to enable pcie ref clock\n");
642 /* allow the clocks to stabilize */
643 usleep_range(200, 500);
647 clk_disable_unprepare(imx6_pcie->pcie);
649 clk_disable_unprepare(imx6_pcie->pcie_bus);
651 clk_disable_unprepare(imx6_pcie->pcie_phy);
656 static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
658 imx6_pcie_disable_ref_clk(imx6_pcie);
659 clk_disable_unprepare(imx6_pcie->pcie);
660 clk_disable_unprepare(imx6_pcie->pcie_bus);
661 clk_disable_unprepare(imx6_pcie->pcie_phy);
664 static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
666 switch (imx6_pcie->drvdata->variant) {
669 reset_control_assert(imx6_pcie->pciephy_reset);
672 reset_control_assert(imx6_pcie->apps_reset);
675 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
676 IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
677 IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
678 /* Force PCIe PHY reset */
679 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
680 IMX6SX_GPR5_PCIE_BTNRST_RESET,
681 IMX6SX_GPR5_PCIE_BTNRST_RESET);
684 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
685 IMX6Q_GPR1_PCIE_SW_RST,
686 IMX6Q_GPR1_PCIE_SW_RST);
689 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
690 IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
691 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
692 IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
696 /* Some boards don't have PCIe reset GPIO. */
697 if (gpio_is_valid(imx6_pcie->reset_gpio))
698 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
699 imx6_pcie->gpio_active_high);
702 static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
704 struct dw_pcie *pci = imx6_pcie->pci;
705 struct device *dev = pci->dev;
707 switch (imx6_pcie->drvdata->variant) {
709 reset_control_deassert(imx6_pcie->pciephy_reset);
712 reset_control_deassert(imx6_pcie->pciephy_reset);
714 /* Workaround for ERR010728, failure of PCI-e PLL VCO to
715 * oscillate, especially when cold. This turns off "Duty-cycle
716 * Corrector" and other mysterious undocumented things.
718 if (likely(imx6_pcie->phy_base)) {
719 /* De-assert DCC_FB_EN */
720 writel(PCIE_PHY_CMN_REG4_DCC_FB_EN,
721 imx6_pcie->phy_base + PCIE_PHY_CMN_REG4);
722 /* Assert RX_EQS and RX_EQS_SEL */
723 writel(PCIE_PHY_CMN_REG24_RX_EQ_SEL
724 | PCIE_PHY_CMN_REG24_RX_EQ,
725 imx6_pcie->phy_base + PCIE_PHY_CMN_REG24);
726 /* Assert ATT_MODE */
727 writel(PCIE_PHY_CMN_REG26_ATT_MODE,
728 imx6_pcie->phy_base + PCIE_PHY_CMN_REG26);
730 dev_warn(dev, "Unable to apply ERR010728 workaround. DT missing fsl,imx7d-pcie-phy phandle ?\n");
733 imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
736 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
737 IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
740 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
741 IMX6Q_GPR1_PCIE_SW_RST, 0);
743 usleep_range(200, 500);
745 case IMX6Q: /* Nothing to do */
750 /* Some boards don't have PCIe reset GPIO. */
751 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
753 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
754 !imx6_pcie->gpio_active_high);
755 /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */
762 static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
764 struct dw_pcie *pci = imx6_pcie->pci;
765 struct device *dev = pci->dev;
767 unsigned int retries;
769 for (retries = 0; retries < 200; retries++) {
770 tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
771 /* Test if the speed change finished. */
772 if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
774 usleep_range(100, 1000);
777 dev_err(dev, "Speed change timeout\n");
781 static void imx6_pcie_ltssm_enable(struct device *dev)
783 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
785 switch (imx6_pcie->drvdata->variant) {
789 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
790 IMX6Q_GPR12_PCIE_CTL_2,
791 IMX6Q_GPR12_PCIE_CTL_2);
796 reset_control_deassert(imx6_pcie->apps_reset);
801 static void imx6_pcie_ltssm_disable(struct device *dev)
803 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
805 switch (imx6_pcie->drvdata->variant) {
809 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
810 IMX6Q_GPR12_PCIE_CTL_2, 0);
815 reset_control_assert(imx6_pcie->apps_reset);
820 static int imx6_pcie_start_link(struct dw_pcie *pci)
822 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
823 struct device *dev = pci->dev;
824 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
829 * Force Gen1 operation when starting the link. In case the link is
830 * started in Gen2 mode, there is a possibility the devices on the
831 * bus will not be detected at all. This happens with PCIe switches.
833 dw_pcie_dbi_ro_wr_en(pci);
834 tmp = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
835 tmp &= ~PCI_EXP_LNKCAP_SLS;
836 tmp |= PCI_EXP_LNKCAP_SLS_2_5GB;
837 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, tmp);
838 dw_pcie_dbi_ro_wr_dis(pci);
841 imx6_pcie_ltssm_enable(dev);
843 ret = dw_pcie_wait_for_link(pci);
847 if (pci->link_gen > 1) {
848 /* Allow faster modes after the link is up */
849 dw_pcie_dbi_ro_wr_en(pci);
850 tmp = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
851 tmp &= ~PCI_EXP_LNKCAP_SLS;
852 tmp |= pci->link_gen;
853 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, tmp);
856 * Start Directed Speed Change so the best possible
857 * speed both link partners support can be negotiated.
859 tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
860 tmp |= PORT_LOGIC_SPEED_CHANGE;
861 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
862 dw_pcie_dbi_ro_wr_dis(pci);
864 if (imx6_pcie->drvdata->flags &
865 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE) {
867 * On i.MX7, DIRECT_SPEED_CHANGE behaves differently
868 * from i.MX6 family when no link speed transition
869 * occurs and we go Gen1 -> yep, Gen1. The difference
870 * is that, in such case, it will not be cleared by HW
871 * which will cause the following code to report false
875 ret = imx6_pcie_wait_for_speed_change(imx6_pcie);
877 dev_err(dev, "Failed to bring link up!\n");
882 /* Make sure link training is finished as well! */
883 ret = dw_pcie_wait_for_link(pci);
887 dev_info(dev, "Link: Only Gen1 is enabled\n");
890 imx6_pcie->link_is_up = true;
891 tmp = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
892 dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS);
896 imx6_pcie->link_is_up = false;
897 dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
898 dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0),
899 dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));
900 imx6_pcie_reset_phy(imx6_pcie);
904 static void imx6_pcie_stop_link(struct dw_pcie *pci)
906 struct device *dev = pci->dev;
908 /* Turn off PCIe LTSSM */
909 imx6_pcie_ltssm_disable(dev);
912 static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
914 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
915 struct device *dev = pci->dev;
916 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
919 if (imx6_pcie->vpcie) {
920 ret = regulator_enable(imx6_pcie->vpcie);
922 dev_err(dev, "failed to enable vpcie regulator: %d\n",
928 imx6_pcie_assert_core_reset(imx6_pcie);
929 imx6_pcie_init_phy(imx6_pcie);
931 ret = imx6_pcie_clk_enable(imx6_pcie);
933 dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
934 goto err_reg_disable;
937 if (imx6_pcie->phy) {
938 ret = phy_power_on(imx6_pcie->phy);
940 dev_err(dev, "pcie PHY power up failed\n");
941 goto err_clk_disable;
945 ret = imx6_pcie_deassert_core_reset(imx6_pcie);
947 dev_err(dev, "pcie deassert core reset failed: %d\n", ret);
951 if (imx6_pcie->phy) {
952 ret = phy_init(imx6_pcie->phy);
954 dev_err(dev, "waiting for PHY ready timeout!\n");
958 imx6_setup_phy_mpll(imx6_pcie);
964 phy_power_off(imx6_pcie->phy);
966 imx6_pcie_clk_disable(imx6_pcie);
968 if (imx6_pcie->vpcie)
969 regulator_disable(imx6_pcie->vpcie);
973 static void imx6_pcie_host_exit(struct dw_pcie_rp *pp)
975 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
976 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
978 if (imx6_pcie->phy) {
979 if (phy_power_off(imx6_pcie->phy))
980 dev_err(pci->dev, "unable to power off PHY\n");
981 phy_exit(imx6_pcie->phy);
983 imx6_pcie_clk_disable(imx6_pcie);
985 if (imx6_pcie->vpcie)
986 regulator_disable(imx6_pcie->vpcie);
989 static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
990 .host_init = imx6_pcie_host_init,
993 static const struct dw_pcie_ops dw_pcie_ops = {
994 .start_link = imx6_pcie_start_link,
997 static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
999 struct device *dev = imx6_pcie->pci->dev;
1001 /* Some variants have a turnoff reset in DT */
1002 if (imx6_pcie->turnoff_reset) {
1003 reset_control_assert(imx6_pcie->turnoff_reset);
1004 reset_control_deassert(imx6_pcie->turnoff_reset);
1005 goto pm_turnoff_sleep;
1008 /* Others poke directly at IOMUXC registers */
1009 switch (imx6_pcie->drvdata->variant) {
1012 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
1013 IMX6SX_GPR12_PCIE_PM_TURN_OFF,
1014 IMX6SX_GPR12_PCIE_PM_TURN_OFF);
1015 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
1016 IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0);
1019 dev_err(dev, "PME_Turn_Off not implemented\n");
1024 * Components with an upstream port must respond to
1025 * PME_Turn_Off with PME_TO_Ack but we can't check.
1027 * The standard recommends a 1-10ms timeout after which to
1028 * proceed anyway as if acks were received.
1031 usleep_range(1000, 10000);
1034 static int imx6_pcie_suspend_noirq(struct device *dev)
1036 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
1037 struct dw_pcie_rp *pp = &imx6_pcie->pci->pp;
1039 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
1042 imx6_pcie_pm_turnoff(imx6_pcie);
1043 imx6_pcie_stop_link(imx6_pcie->pci);
1044 imx6_pcie_host_exit(pp);
1049 static int imx6_pcie_resume_noirq(struct device *dev)
1052 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
1053 struct dw_pcie_rp *pp = &imx6_pcie->pci->pp;
1055 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
1058 ret = imx6_pcie_host_init(pp);
1061 dw_pcie_setup_rc(pp);
1063 if (imx6_pcie->link_is_up)
1064 imx6_pcie_start_link(imx6_pcie->pci);
1069 static const struct dev_pm_ops imx6_pcie_pm_ops = {
1070 NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
1071 imx6_pcie_resume_noirq)
1074 static int imx6_pcie_probe(struct platform_device *pdev)
1076 struct device *dev = &pdev->dev;
1077 struct dw_pcie *pci;
1078 struct imx6_pcie *imx6_pcie;
1079 struct device_node *np;
1080 struct resource *dbi_base;
1081 struct device_node *node = dev->of_node;
1085 imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL);
1089 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1094 pci->ops = &dw_pcie_ops;
1095 pci->pp.ops = &imx6_pcie_host_ops;
1097 imx6_pcie->pci = pci;
1098 imx6_pcie->drvdata = of_device_get_match_data(dev);
1100 /* Find the PHY if one is defined, only imx7d uses it */
1101 np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0);
1103 struct resource res;
1105 ret = of_address_to_resource(np, 0, &res);
1107 dev_err(dev, "Unable to map PCIe PHY\n");
1110 imx6_pcie->phy_base = devm_ioremap_resource(dev, &res);
1111 if (IS_ERR(imx6_pcie->phy_base))
1112 return PTR_ERR(imx6_pcie->phy_base);
1115 dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1116 pci->dbi_base = devm_ioremap_resource(dev, dbi_base);
1117 if (IS_ERR(pci->dbi_base))
1118 return PTR_ERR(pci->dbi_base);
1121 imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
1122 imx6_pcie->gpio_active_high = of_property_read_bool(node,
1123 "reset-gpio-active-high");
1124 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
1125 ret = devm_gpio_request_one(dev, imx6_pcie->reset_gpio,
1126 imx6_pcie->gpio_active_high ?
1127 GPIOF_OUT_INIT_HIGH :
1131 dev_err(dev, "unable to get reset gpio\n");
1134 } else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) {
1135 return imx6_pcie->reset_gpio;
1139 imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
1140 if (IS_ERR(imx6_pcie->pcie_bus))
1141 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_bus),
1142 "pcie_bus clock source missing or invalid\n");
1144 imx6_pcie->pcie = devm_clk_get(dev, "pcie");
1145 if (IS_ERR(imx6_pcie->pcie))
1146 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie),
1147 "pcie clock source missing or invalid\n");
1149 switch (imx6_pcie->drvdata->variant) {
1151 imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
1152 "pcie_inbound_axi");
1153 if (IS_ERR(imx6_pcie->pcie_inbound_axi))
1154 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi),
1155 "pcie_inbound_axi clock missing or invalid\n");
1158 imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
1159 if (IS_ERR(imx6_pcie->pcie_aux))
1160 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
1161 "pcie_aux clock source missing or invalid\n");
1164 if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
1165 imx6_pcie->controller_id = 1;
1167 imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
1169 if (IS_ERR(imx6_pcie->pciephy_reset)) {
1170 dev_err(dev, "Failed to get PCIEPHY reset control\n");
1171 return PTR_ERR(imx6_pcie->pciephy_reset);
1174 imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
1176 if (IS_ERR(imx6_pcie->apps_reset)) {
1177 dev_err(dev, "Failed to get PCIE APPS reset control\n");
1178 return PTR_ERR(imx6_pcie->apps_reset);
1182 imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
1183 if (IS_ERR(imx6_pcie->pcie_aux))
1184 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
1185 "pcie_aux clock source missing or invalid\n");
1186 imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
1188 if (IS_ERR(imx6_pcie->apps_reset))
1189 return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
1190 "failed to get pcie apps reset control\n");
1192 imx6_pcie->phy = devm_phy_get(dev, "pcie-phy");
1193 if (IS_ERR(imx6_pcie->phy))
1194 return dev_err_probe(dev, PTR_ERR(imx6_pcie->phy),
1195 "failed to get pcie phy\n");
1201 /* Don't fetch the pcie_phy clock, if it has abstract PHY driver */
1202 if (imx6_pcie->phy == NULL) {
1203 imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
1204 if (IS_ERR(imx6_pcie->pcie_phy))
1205 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_phy),
1206 "pcie_phy clock source missing or invalid\n");
1210 /* Grab turnoff reset */
1211 imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
1212 if (IS_ERR(imx6_pcie->turnoff_reset)) {
1213 dev_err(dev, "Failed to get TURNOFF reset control\n");
1214 return PTR_ERR(imx6_pcie->turnoff_reset);
1217 /* Grab GPR config register range */
1218 imx6_pcie->iomuxc_gpr =
1219 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
1220 if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
1221 dev_err(dev, "unable to find iomuxc registers\n");
1222 return PTR_ERR(imx6_pcie->iomuxc_gpr);
1225 /* Grab PCIe PHY Tx Settings */
1226 if (of_property_read_u32(node, "fsl,tx-deemph-gen1",
1227 &imx6_pcie->tx_deemph_gen1))
1228 imx6_pcie->tx_deemph_gen1 = 0;
1230 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-3p5db",
1231 &imx6_pcie->tx_deemph_gen2_3p5db))
1232 imx6_pcie->tx_deemph_gen2_3p5db = 0;
1234 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-6db",
1235 &imx6_pcie->tx_deemph_gen2_6db))
1236 imx6_pcie->tx_deemph_gen2_6db = 20;
1238 if (of_property_read_u32(node, "fsl,tx-swing-full",
1239 &imx6_pcie->tx_swing_full))
1240 imx6_pcie->tx_swing_full = 127;
1242 if (of_property_read_u32(node, "fsl,tx-swing-low",
1243 &imx6_pcie->tx_swing_low))
1244 imx6_pcie->tx_swing_low = 127;
1246 /* Limit link speed */
1248 of_property_read_u32(node, "fsl,max-link-speed", &pci->link_gen);
1250 imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
1251 if (IS_ERR(imx6_pcie->vpcie)) {
1252 if (PTR_ERR(imx6_pcie->vpcie) != -ENODEV)
1253 return PTR_ERR(imx6_pcie->vpcie);
1254 imx6_pcie->vpcie = NULL;
1257 imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
1258 if (IS_ERR(imx6_pcie->vph)) {
1259 if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
1260 return PTR_ERR(imx6_pcie->vph);
1261 imx6_pcie->vph = NULL;
1264 platform_set_drvdata(pdev, imx6_pcie);
1266 ret = imx6_pcie_attach_pd(dev);
1270 ret = dw_pcie_host_init(&pci->pp);
1274 if (pci_msi_enabled()) {
1275 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI);
1276 val = dw_pcie_readw_dbi(pci, offset + PCI_MSI_FLAGS);
1277 val |= PCI_MSI_FLAGS_ENABLE;
1278 dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS, val);
1284 static void imx6_pcie_shutdown(struct platform_device *pdev)
1286 struct imx6_pcie *imx6_pcie = platform_get_drvdata(pdev);
1288 /* bring down link, so bootloader gets clean state in case of reboot */
1289 imx6_pcie_assert_core_reset(imx6_pcie);
1292 static const struct imx6_pcie_drvdata drvdata[] = {
1295 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1296 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
1297 .dbi_length = 0x200,
1301 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1302 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
1303 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1307 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1308 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
1309 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1310 .dbi_length = 0x200,
1314 .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1321 .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1325 static const struct of_device_id imx6_pcie_of_match[] = {
1326 { .compatible = "fsl,imx6q-pcie", .data = &drvdata[IMX6Q], },
1327 { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], },
1328 { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], },
1329 { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], },
1330 { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
1331 { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
1335 static struct platform_driver imx6_pcie_driver = {
1337 .name = "imx6q-pcie",
1338 .of_match_table = imx6_pcie_of_match,
1339 .suppress_bind_attrs = true,
1340 .pm = &imx6_pcie_pm_ops,
1341 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1343 .probe = imx6_pcie_probe,
1344 .shutdown = imx6_pcie_shutdown,
1347 static void imx6_pcie_quirk(struct pci_dev *dev)
1349 struct pci_bus *bus = dev->bus;
1350 struct dw_pcie_rp *pp = bus->sysdata;
1352 /* Bus parent is the PCI bridge, its parent is this platform driver */
1353 if (!bus->dev.parent || !bus->dev.parent->parent)
1356 /* Make sure we only quirk devices associated with this driver */
1357 if (bus->dev.parent->parent->driver != &imx6_pcie_driver.driver)
1360 if (pci_is_root_bus(bus)) {
1361 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1362 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
1365 * Limit config length to avoid the kernel reading beyond
1366 * the register set and causing an abort on i.MX 6Quad
1368 if (imx6_pcie->drvdata->dbi_length) {
1369 dev->cfg_size = imx6_pcie->drvdata->dbi_length;
1370 dev_info(&dev->dev, "Limiting cfg_size to %d\n",
1375 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, 0xabcd,
1376 PCI_CLASS_BRIDGE_PCI, 8, imx6_pcie_quirk);
1378 static int __init imx6_pcie_init(void)
1382 * Since probe() can be deferred we need to make sure that
1383 * hook_fault_code is not called after __init memory is freed
1384 * by kernel and since imx6q_pcie_abort_handler() is a no-op,
1385 * we can install the handler here without risking it
1386 * accessing some uninitialized driver state.
1388 hook_fault_code(8, imx6q_pcie_abort_handler, SIGBUS, 0,
1389 "external abort on non-linefetch");
1392 return platform_driver_register(&imx6_pcie_driver);
1394 device_initcall(imx6_pcie_init);