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>
21 #include <linux/of_gpio.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 {
60 #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
61 #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE BIT(1)
62 #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND BIT(2)
64 struct imx6_pcie_drvdata {
65 enum imx6_pcie_variants variant;
66 enum dw_pcie_device_mode mode;
75 bool gpio_active_high;
79 struct clk *pcie_inbound_axi;
82 struct regmap *iomuxc_gpr;
85 struct reset_control *pciephy_reset;
86 struct reset_control *apps_reset;
87 struct reset_control *turnoff_reset;
89 u32 tx_deemph_gen2_3p5db;
90 u32 tx_deemph_gen2_6db;
93 struct regulator *vpcie;
94 struct regulator *vph;
95 void __iomem *phy_base;
97 /* power domain for pcie */
98 struct device *pd_pcie;
99 /* power domain for pcie phy */
100 struct device *pd_pcie_phy;
102 const struct imx6_pcie_drvdata *drvdata;
105 /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
106 #define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200
107 #define PHY_PLL_LOCK_WAIT_TIMEOUT (2000 * PHY_PLL_LOCK_WAIT_USLEEP_MAX)
109 /* PCIe Port Logic registers (memory-mapped) */
110 #define PL_OFFSET 0x700
112 #define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
113 #define PCIE_PHY_CTRL_DATA(x) FIELD_PREP(GENMASK(15, 0), (x))
114 #define PCIE_PHY_CTRL_CAP_ADR BIT(16)
115 #define PCIE_PHY_CTRL_CAP_DAT BIT(17)
116 #define PCIE_PHY_CTRL_WR BIT(18)
117 #define PCIE_PHY_CTRL_RD BIT(19)
119 #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
120 #define PCIE_PHY_STAT_ACK BIT(16)
122 /* PHY registers (not memory-mapped) */
123 #define PCIE_PHY_ATEOVRD 0x10
124 #define PCIE_PHY_ATEOVRD_EN BIT(2)
125 #define PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT 0
126 #define PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK 0x1
128 #define PCIE_PHY_MPLL_OVRD_IN_LO 0x11
129 #define PCIE_PHY_MPLL_MULTIPLIER_SHIFT 2
130 #define PCIE_PHY_MPLL_MULTIPLIER_MASK 0x7f
131 #define PCIE_PHY_MPLL_MULTIPLIER_OVRD BIT(9)
133 #define PCIE_PHY_RX_ASIC_OUT 0x100D
134 #define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
136 /* iMX7 PCIe PHY registers */
137 #define PCIE_PHY_CMN_REG4 0x14
138 /* These are probably the bits that *aren't* DCC_FB_EN */
139 #define PCIE_PHY_CMN_REG4_DCC_FB_EN 0x29
141 #define PCIE_PHY_CMN_REG15 0x54
142 #define PCIE_PHY_CMN_REG15_DLY_4 BIT(2)
143 #define PCIE_PHY_CMN_REG15_PLL_PD BIT(5)
144 #define PCIE_PHY_CMN_REG15_OVRD_PLL_PD BIT(7)
146 #define PCIE_PHY_CMN_REG24 0x90
147 #define PCIE_PHY_CMN_REG24_RX_EQ BIT(6)
148 #define PCIE_PHY_CMN_REG24_RX_EQ_SEL BIT(3)
150 #define PCIE_PHY_CMN_REG26 0x98
151 #define PCIE_PHY_CMN_REG26_ATT_MODE 0xBC
153 #define PHY_RX_OVRD_IN_LO 0x1005
154 #define PHY_RX_OVRD_IN_LO_RX_DATA_EN BIT(5)
155 #define PHY_RX_OVRD_IN_LO_RX_PLL_EN BIT(3)
157 static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
159 WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ &&
160 imx6_pcie->drvdata->variant != IMX8MQ_EP &&
161 imx6_pcie->drvdata->variant != IMX8MM &&
162 imx6_pcie->drvdata->variant != IMX8MM_EP &&
163 imx6_pcie->drvdata->variant != IMX8MP &&
164 imx6_pcie->drvdata->variant != IMX8MP_EP);
165 return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
168 static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
170 unsigned int mask, val, mode;
172 if (imx6_pcie->drvdata->mode == DW_PCIE_EP_TYPE)
173 mode = PCI_EXP_TYPE_ENDPOINT;
175 mode = PCI_EXP_TYPE_ROOT_PORT;
177 switch (imx6_pcie->drvdata->variant) {
180 if (imx6_pcie->controller_id == 1) {
181 mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
182 val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
185 mask = IMX6Q_GPR12_DEVICE_TYPE;
186 val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
190 mask = IMX6Q_GPR12_DEVICE_TYPE;
191 val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
195 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
198 static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
200 struct dw_pcie *pci = imx6_pcie->pci;
202 u32 max_iterations = 10;
203 u32 wait_counter = 0;
206 val = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT) &
214 } while (wait_counter < max_iterations);
219 static int pcie_phy_wait_ack(struct imx6_pcie *imx6_pcie, int addr)
221 struct dw_pcie *pci = imx6_pcie->pci;
225 val = PCIE_PHY_CTRL_DATA(addr);
226 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
228 val |= PCIE_PHY_CTRL_CAP_ADR;
229 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
231 ret = pcie_phy_poll_ack(imx6_pcie, true);
235 val = PCIE_PHY_CTRL_DATA(addr);
236 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, val);
238 return pcie_phy_poll_ack(imx6_pcie, false);
241 /* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
242 static int pcie_phy_read(struct imx6_pcie *imx6_pcie, int addr, u16 *data)
244 struct dw_pcie *pci = imx6_pcie->pci;
248 ret = pcie_phy_wait_ack(imx6_pcie, addr);
252 /* assert Read signal */
253 phy_ctl = PCIE_PHY_CTRL_RD;
254 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, phy_ctl);
256 ret = pcie_phy_poll_ack(imx6_pcie, true);
260 *data = dw_pcie_readl_dbi(pci, PCIE_PHY_STAT);
262 /* deassert Read signal */
263 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x00);
265 return pcie_phy_poll_ack(imx6_pcie, false);
268 static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, u16 data)
270 struct dw_pcie *pci = imx6_pcie->pci;
276 ret = pcie_phy_wait_ack(imx6_pcie, addr);
280 var = PCIE_PHY_CTRL_DATA(data);
281 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
284 var |= PCIE_PHY_CTRL_CAP_DAT;
285 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
287 ret = pcie_phy_poll_ack(imx6_pcie, true);
291 /* deassert cap data */
292 var = PCIE_PHY_CTRL_DATA(data);
293 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
295 /* wait for ack de-assertion */
296 ret = pcie_phy_poll_ack(imx6_pcie, false);
300 /* assert wr signal */
301 var = PCIE_PHY_CTRL_WR;
302 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
305 ret = pcie_phy_poll_ack(imx6_pcie, true);
309 /* deassert wr signal */
310 var = PCIE_PHY_CTRL_DATA(data);
311 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, var);
313 /* wait for ack de-assertion */
314 ret = pcie_phy_poll_ack(imx6_pcie, false);
318 dw_pcie_writel_dbi(pci, PCIE_PHY_CTRL, 0x0);
323 static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
325 switch (imx6_pcie->drvdata->variant) {
331 * The PHY initialization had been done in the PHY
332 * driver, break here directly.
338 * TODO: Currently this code assumes external
339 * oscillator is being used
341 regmap_update_bits(imx6_pcie->iomuxc_gpr,
342 imx6_pcie_grp_offset(imx6_pcie),
343 IMX8MQ_GPR_PCIE_REF_USE_PAD,
344 IMX8MQ_GPR_PCIE_REF_USE_PAD);
346 * Regarding the datasheet, the PCIE_VPH is suggested
347 * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
348 * VREG_BYPASS should be cleared to zero.
350 if (imx6_pcie->vph &&
351 regulator_get_voltage(imx6_pcie->vph) > 3000000)
352 regmap_update_bits(imx6_pcie->iomuxc_gpr,
353 imx6_pcie_grp_offset(imx6_pcie),
354 IMX8MQ_GPR_PCIE_VREG_BYPASS,
358 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
359 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
362 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
363 IMX6SX_GPR12_PCIE_RX_EQ_MASK,
364 IMX6SX_GPR12_PCIE_RX_EQ_2);
367 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
368 IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
370 /* configure constant input signal to the pcie ctrl and phy */
371 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
372 IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
374 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
375 IMX6Q_GPR8_TX_DEEMPH_GEN1,
376 imx6_pcie->tx_deemph_gen1 << 0);
377 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
378 IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
379 imx6_pcie->tx_deemph_gen2_3p5db << 6);
380 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
381 IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
382 imx6_pcie->tx_deemph_gen2_6db << 12);
383 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
384 IMX6Q_GPR8_TX_SWING_FULL,
385 imx6_pcie->tx_swing_full << 18);
386 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
387 IMX6Q_GPR8_TX_SWING_LOW,
388 imx6_pcie->tx_swing_low << 25);
392 imx6_pcie_configure_type(imx6_pcie);
395 static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
398 struct device *dev = imx6_pcie->pci->dev;
400 if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
402 val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
403 PHY_PLL_LOCK_WAIT_USLEEP_MAX,
404 PHY_PLL_LOCK_WAIT_TIMEOUT))
405 dev_err(dev, "PCIe PLL lock timeout\n");
408 static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
410 unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
414 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
420 * The default settings of the MPLL are for a 125MHz input
421 * clock, so no need to reconfigure anything in that case.
433 dev_err(imx6_pcie->pci->dev,
434 "Unsupported PHY reference clock rate %lu\n", phy_rate);
438 pcie_phy_read(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, &val);
439 val &= ~(PCIE_PHY_MPLL_MULTIPLIER_MASK <<
440 PCIE_PHY_MPLL_MULTIPLIER_SHIFT);
441 val |= mult << PCIE_PHY_MPLL_MULTIPLIER_SHIFT;
442 val |= PCIE_PHY_MPLL_MULTIPLIER_OVRD;
443 pcie_phy_write(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, val);
445 pcie_phy_read(imx6_pcie, PCIE_PHY_ATEOVRD, &val);
446 val &= ~(PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK <<
447 PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT);
448 val |= div << PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT;
449 val |= PCIE_PHY_ATEOVRD_EN;
450 pcie_phy_write(imx6_pcie, PCIE_PHY_ATEOVRD, val);
455 static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
459 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
462 pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
463 tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
464 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
465 pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
467 usleep_range(2000, 3000);
469 pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
470 tmp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
471 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
472 pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
476 /* Added for PCI abort handling */
477 static int imx6q_pcie_abort_handler(unsigned long addr,
478 unsigned int fsr, struct pt_regs *regs)
480 unsigned long pc = instruction_pointer(regs);
481 unsigned long instr = *(unsigned long *)pc;
482 int reg = (instr >> 12) & 15;
485 * If the instruction being executed was a read,
486 * make it look like it read all-ones.
488 if ((instr & 0x0c100000) == 0x04100000) {
491 if (instr & 0x00400000)
496 regs->uregs[reg] = val;
501 if ((instr & 0x0e100090) == 0x00100090) {
502 regs->uregs[reg] = -1;
511 static int imx6_pcie_attach_pd(struct device *dev)
513 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
514 struct device_link *link;
516 /* Do nothing when in a single power domain */
520 imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
521 if (IS_ERR(imx6_pcie->pd_pcie))
522 return PTR_ERR(imx6_pcie->pd_pcie);
523 /* Do nothing when power domain missing */
524 if (!imx6_pcie->pd_pcie)
526 link = device_link_add(dev, imx6_pcie->pd_pcie,
531 dev_err(dev, "Failed to add device_link to pcie pd.\n");
535 imx6_pcie->pd_pcie_phy = dev_pm_domain_attach_by_name(dev, "pcie_phy");
536 if (IS_ERR(imx6_pcie->pd_pcie_phy))
537 return PTR_ERR(imx6_pcie->pd_pcie_phy);
539 link = device_link_add(dev, imx6_pcie->pd_pcie_phy,
544 dev_err(dev, "Failed to add device_link to pcie_phy pd.\n");
551 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
553 struct dw_pcie *pci = imx6_pcie->pci;
554 struct device *dev = pci->dev;
558 switch (imx6_pcie->drvdata->variant) {
560 ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
562 dev_err(dev, "unable to enable pcie_axi clock\n");
566 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
567 IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
571 /* power up core phy and enable ref clock */
572 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
573 IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
575 * the async reset input need ref clock to sync internally,
576 * when the ref clock comes after reset, internal synced
577 * reset time is too short, cannot meet the requirement.
578 * add one ~10us delay here.
580 usleep_range(10, 100);
581 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
582 IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
592 ret = clk_prepare_enable(imx6_pcie->pcie_aux);
594 dev_err(dev, "unable to enable pcie_aux clock\n");
598 offset = imx6_pcie_grp_offset(imx6_pcie);
600 * Set the over ride low and enabled
601 * make sure that REF_CLK is turned on.
603 regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
604 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
606 regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
607 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
608 IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
615 static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
617 switch (imx6_pcie->drvdata->variant) {
619 clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
623 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
624 IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
625 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
626 IMX6Q_GPR1_PCIE_TEST_PD,
627 IMX6Q_GPR1_PCIE_TEST_PD);
630 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
631 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
632 IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
640 clk_disable_unprepare(imx6_pcie->pcie_aux);
647 static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
649 struct dw_pcie *pci = imx6_pcie->pci;
650 struct device *dev = pci->dev;
653 ret = clk_prepare_enable(imx6_pcie->pcie_phy);
655 dev_err(dev, "unable to enable pcie_phy clock\n");
659 ret = clk_prepare_enable(imx6_pcie->pcie_bus);
661 dev_err(dev, "unable to enable pcie_bus clock\n");
665 ret = clk_prepare_enable(imx6_pcie->pcie);
667 dev_err(dev, "unable to enable pcie clock\n");
671 ret = imx6_pcie_enable_ref_clk(imx6_pcie);
673 dev_err(dev, "unable to enable pcie ref clock\n");
677 /* allow the clocks to stabilize */
678 usleep_range(200, 500);
682 clk_disable_unprepare(imx6_pcie->pcie);
684 clk_disable_unprepare(imx6_pcie->pcie_bus);
686 clk_disable_unprepare(imx6_pcie->pcie_phy);
691 static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
693 imx6_pcie_disable_ref_clk(imx6_pcie);
694 clk_disable_unprepare(imx6_pcie->pcie);
695 clk_disable_unprepare(imx6_pcie->pcie_bus);
696 clk_disable_unprepare(imx6_pcie->pcie_phy);
699 static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
701 switch (imx6_pcie->drvdata->variant) {
705 reset_control_assert(imx6_pcie->pciephy_reset);
711 reset_control_assert(imx6_pcie->apps_reset);
714 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
715 IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
716 IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
717 /* Force PCIe PHY reset */
718 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
719 IMX6SX_GPR5_PCIE_BTNRST_RESET,
720 IMX6SX_GPR5_PCIE_BTNRST_RESET);
723 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
724 IMX6Q_GPR1_PCIE_SW_RST,
725 IMX6Q_GPR1_PCIE_SW_RST);
728 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
729 IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
730 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
731 IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
735 /* Some boards don't have PCIe reset GPIO. */
736 if (gpio_is_valid(imx6_pcie->reset_gpio))
737 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
738 imx6_pcie->gpio_active_high);
741 static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
743 struct dw_pcie *pci = imx6_pcie->pci;
744 struct device *dev = pci->dev;
746 switch (imx6_pcie->drvdata->variant) {
749 reset_control_deassert(imx6_pcie->pciephy_reset);
752 reset_control_deassert(imx6_pcie->pciephy_reset);
754 /* Workaround for ERR010728, failure of PCI-e PLL VCO to
755 * oscillate, especially when cold. This turns off "Duty-cycle
756 * Corrector" and other mysterious undocumented things.
758 if (likely(imx6_pcie->phy_base)) {
759 /* De-assert DCC_FB_EN */
760 writel(PCIE_PHY_CMN_REG4_DCC_FB_EN,
761 imx6_pcie->phy_base + PCIE_PHY_CMN_REG4);
762 /* Assert RX_EQS and RX_EQS_SEL */
763 writel(PCIE_PHY_CMN_REG24_RX_EQ_SEL
764 | PCIE_PHY_CMN_REG24_RX_EQ,
765 imx6_pcie->phy_base + PCIE_PHY_CMN_REG24);
766 /* Assert ATT_MODE */
767 writel(PCIE_PHY_CMN_REG26_ATT_MODE,
768 imx6_pcie->phy_base + PCIE_PHY_CMN_REG26);
770 dev_warn(dev, "Unable to apply ERR010728 workaround. DT missing fsl,imx7d-pcie-phy phandle ?\n");
773 imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
776 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
777 IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
780 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
781 IMX6Q_GPR1_PCIE_SW_RST, 0);
783 usleep_range(200, 500);
785 case IMX6Q: /* Nothing to do */
793 /* Some boards don't have PCIe reset GPIO. */
794 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
796 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
797 !imx6_pcie->gpio_active_high);
798 /* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */
805 static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
807 struct dw_pcie *pci = imx6_pcie->pci;
808 struct device *dev = pci->dev;
810 unsigned int retries;
812 for (retries = 0; retries < 200; retries++) {
813 tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
814 /* Test if the speed change finished. */
815 if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
817 usleep_range(100, 1000);
820 dev_err(dev, "Speed change timeout\n");
824 static void imx6_pcie_ltssm_enable(struct device *dev)
826 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
828 switch (imx6_pcie->drvdata->variant) {
832 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
833 IMX6Q_GPR12_PCIE_CTL_2,
834 IMX6Q_GPR12_PCIE_CTL_2);
843 reset_control_deassert(imx6_pcie->apps_reset);
848 static void imx6_pcie_ltssm_disable(struct device *dev)
850 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
852 switch (imx6_pcie->drvdata->variant) {
856 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
857 IMX6Q_GPR12_PCIE_CTL_2, 0);
866 reset_control_assert(imx6_pcie->apps_reset);
871 static int imx6_pcie_start_link(struct dw_pcie *pci)
873 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
874 struct device *dev = pci->dev;
875 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
880 * Force Gen1 operation when starting the link. In case the link is
881 * started in Gen2 mode, there is a possibility the devices on the
882 * bus will not be detected at all. This happens with PCIe switches.
884 dw_pcie_dbi_ro_wr_en(pci);
885 tmp = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
886 tmp &= ~PCI_EXP_LNKCAP_SLS;
887 tmp |= PCI_EXP_LNKCAP_SLS_2_5GB;
888 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, tmp);
889 dw_pcie_dbi_ro_wr_dis(pci);
892 imx6_pcie_ltssm_enable(dev);
894 ret = dw_pcie_wait_for_link(pci);
898 if (pci->link_gen > 1) {
899 /* Allow faster modes after the link is up */
900 dw_pcie_dbi_ro_wr_en(pci);
901 tmp = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
902 tmp &= ~PCI_EXP_LNKCAP_SLS;
903 tmp |= pci->link_gen;
904 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, tmp);
907 * Start Directed Speed Change so the best possible
908 * speed both link partners support can be negotiated.
910 tmp = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
911 tmp |= PORT_LOGIC_SPEED_CHANGE;
912 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
913 dw_pcie_dbi_ro_wr_dis(pci);
915 if (imx6_pcie->drvdata->flags &
916 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE) {
918 * On i.MX7, DIRECT_SPEED_CHANGE behaves differently
919 * from i.MX6 family when no link speed transition
920 * occurs and we go Gen1 -> yep, Gen1. The difference
921 * is that, in such case, it will not be cleared by HW
922 * which will cause the following code to report false
926 ret = imx6_pcie_wait_for_speed_change(imx6_pcie);
928 dev_err(dev, "Failed to bring link up!\n");
933 /* Make sure link training is finished as well! */
934 ret = dw_pcie_wait_for_link(pci);
938 dev_info(dev, "Link: Only Gen1 is enabled\n");
941 imx6_pcie->link_is_up = true;
942 tmp = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
943 dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS);
947 imx6_pcie->link_is_up = false;
948 dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
949 dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0),
950 dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));
951 imx6_pcie_reset_phy(imx6_pcie);
955 static void imx6_pcie_stop_link(struct dw_pcie *pci)
957 struct device *dev = pci->dev;
959 /* Turn off PCIe LTSSM */
960 imx6_pcie_ltssm_disable(dev);
963 static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
965 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
966 struct device *dev = pci->dev;
967 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
970 if (imx6_pcie->vpcie) {
971 ret = regulator_enable(imx6_pcie->vpcie);
973 dev_err(dev, "failed to enable vpcie regulator: %d\n",
979 imx6_pcie_assert_core_reset(imx6_pcie);
980 imx6_pcie_init_phy(imx6_pcie);
982 ret = imx6_pcie_clk_enable(imx6_pcie);
984 dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
985 goto err_reg_disable;
988 if (imx6_pcie->phy) {
989 ret = phy_init(imx6_pcie->phy);
991 dev_err(dev, "pcie PHY power up failed\n");
992 goto err_clk_disable;
996 if (imx6_pcie->phy) {
997 ret = phy_power_on(imx6_pcie->phy);
999 dev_err(dev, "waiting for PHY ready timeout!\n");
1004 ret = imx6_pcie_deassert_core_reset(imx6_pcie);
1006 dev_err(dev, "pcie deassert core reset failed: %d\n", ret);
1010 imx6_setup_phy_mpll(imx6_pcie);
1016 phy_exit(imx6_pcie->phy);
1018 imx6_pcie_clk_disable(imx6_pcie);
1020 if (imx6_pcie->vpcie)
1021 regulator_disable(imx6_pcie->vpcie);
1025 static void imx6_pcie_host_exit(struct dw_pcie_rp *pp)
1027 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1028 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
1030 if (imx6_pcie->phy) {
1031 if (phy_power_off(imx6_pcie->phy))
1032 dev_err(pci->dev, "unable to power off PHY\n");
1033 phy_exit(imx6_pcie->phy);
1035 imx6_pcie_clk_disable(imx6_pcie);
1037 if (imx6_pcie->vpcie)
1038 regulator_disable(imx6_pcie->vpcie);
1041 static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
1042 .host_init = imx6_pcie_host_init,
1043 .host_deinit = imx6_pcie_host_exit,
1046 static const struct dw_pcie_ops dw_pcie_ops = {
1047 .start_link = imx6_pcie_start_link,
1048 .stop_link = imx6_pcie_stop_link,
1051 static void imx6_pcie_ep_init(struct dw_pcie_ep *ep)
1054 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
1056 for (bar = BAR_0; bar <= BAR_5; bar++)
1057 dw_pcie_ep_reset_bar(pci, bar);
1060 static int imx6_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
1061 enum pci_epc_irq_type type,
1064 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
1067 case PCI_EPC_IRQ_LEGACY:
1068 return dw_pcie_ep_raise_legacy_irq(ep, func_no);
1069 case PCI_EPC_IRQ_MSI:
1070 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
1071 case PCI_EPC_IRQ_MSIX:
1072 return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
1074 dev_err(pci->dev, "UNKNOWN IRQ type\n");
1081 static const struct pci_epc_features imx8m_pcie_epc_features = {
1082 .linkup_notifier = false,
1083 .msi_capable = true,
1084 .msix_capable = false,
1085 .reserved_bar = 1 << BAR_1 | 1 << BAR_3,
1089 static const struct pci_epc_features*
1090 imx6_pcie_ep_get_features(struct dw_pcie_ep *ep)
1092 return &imx8m_pcie_epc_features;
1095 static const struct dw_pcie_ep_ops pcie_ep_ops = {
1096 .ep_init = imx6_pcie_ep_init,
1097 .raise_irq = imx6_pcie_ep_raise_irq,
1098 .get_features = imx6_pcie_ep_get_features,
1101 static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
1102 struct platform_device *pdev)
1105 unsigned int pcie_dbi2_offset;
1106 struct dw_pcie_ep *ep;
1107 struct resource *res;
1108 struct dw_pcie *pci = imx6_pcie->pci;
1109 struct dw_pcie_rp *pp = &pci->pp;
1110 struct device *dev = pci->dev;
1112 imx6_pcie_host_init(pp);
1114 ep->ops = &pcie_ep_ops;
1116 switch (imx6_pcie->drvdata->variant) {
1120 pcie_dbi2_offset = SZ_1M;
1123 pcie_dbi2_offset = SZ_4K;
1126 pci->dbi_base2 = pci->dbi_base + pcie_dbi2_offset;
1127 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
1131 ep->phys_base = res->start;
1132 ep->addr_size = resource_size(res);
1133 ep->page_size = SZ_64K;
1135 ret = dw_pcie_ep_init(ep);
1137 dev_err(dev, "failed to initialize endpoint\n");
1141 imx6_pcie_ltssm_enable(dev);
1146 static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
1148 struct device *dev = imx6_pcie->pci->dev;
1150 /* Some variants have a turnoff reset in DT */
1151 if (imx6_pcie->turnoff_reset) {
1152 reset_control_assert(imx6_pcie->turnoff_reset);
1153 reset_control_deassert(imx6_pcie->turnoff_reset);
1154 goto pm_turnoff_sleep;
1157 /* Others poke directly at IOMUXC registers */
1158 switch (imx6_pcie->drvdata->variant) {
1161 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
1162 IMX6SX_GPR12_PCIE_PM_TURN_OFF,
1163 IMX6SX_GPR12_PCIE_PM_TURN_OFF);
1164 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
1165 IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0);
1168 dev_err(dev, "PME_Turn_Off not implemented\n");
1173 * Components with an upstream port must respond to
1174 * PME_Turn_Off with PME_TO_Ack but we can't check.
1176 * The standard recommends a 1-10ms timeout after which to
1177 * proceed anyway as if acks were received.
1180 usleep_range(1000, 10000);
1183 static void imx6_pcie_msi_save_restore(struct imx6_pcie *imx6_pcie, bool save)
1187 struct dw_pcie *pci = imx6_pcie->pci;
1189 if (pci_msi_enabled()) {
1190 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI);
1192 val = dw_pcie_readw_dbi(pci, offset + PCI_MSI_FLAGS);
1193 imx6_pcie->msi_ctrl = val;
1195 dw_pcie_dbi_ro_wr_en(pci);
1196 val = imx6_pcie->msi_ctrl;
1197 dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS, val);
1198 dw_pcie_dbi_ro_wr_dis(pci);
1203 static int imx6_pcie_suspend_noirq(struct device *dev)
1205 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
1206 struct dw_pcie_rp *pp = &imx6_pcie->pci->pp;
1208 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
1211 imx6_pcie_msi_save_restore(imx6_pcie, true);
1212 imx6_pcie_pm_turnoff(imx6_pcie);
1213 imx6_pcie_stop_link(imx6_pcie->pci);
1214 imx6_pcie_host_exit(pp);
1219 static int imx6_pcie_resume_noirq(struct device *dev)
1222 struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
1223 struct dw_pcie_rp *pp = &imx6_pcie->pci->pp;
1225 if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
1228 ret = imx6_pcie_host_init(pp);
1231 imx6_pcie_msi_save_restore(imx6_pcie, false);
1232 dw_pcie_setup_rc(pp);
1234 if (imx6_pcie->link_is_up)
1235 imx6_pcie_start_link(imx6_pcie->pci);
1240 static const struct dev_pm_ops imx6_pcie_pm_ops = {
1241 NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
1242 imx6_pcie_resume_noirq)
1245 static int imx6_pcie_probe(struct platform_device *pdev)
1247 struct device *dev = &pdev->dev;
1248 struct dw_pcie *pci;
1249 struct imx6_pcie *imx6_pcie;
1250 struct device_node *np;
1251 struct resource *dbi_base;
1252 struct device_node *node = dev->of_node;
1256 imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL);
1260 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1265 pci->ops = &dw_pcie_ops;
1266 pci->pp.ops = &imx6_pcie_host_ops;
1268 imx6_pcie->pci = pci;
1269 imx6_pcie->drvdata = of_device_get_match_data(dev);
1271 /* Find the PHY if one is defined, only imx7d uses it */
1272 np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0);
1274 struct resource res;
1276 ret = of_address_to_resource(np, 0, &res);
1278 dev_err(dev, "Unable to map PCIe PHY\n");
1281 imx6_pcie->phy_base = devm_ioremap_resource(dev, &res);
1282 if (IS_ERR(imx6_pcie->phy_base))
1283 return PTR_ERR(imx6_pcie->phy_base);
1286 pci->dbi_base = devm_platform_get_and_ioremap_resource(pdev, 0, &dbi_base);
1287 if (IS_ERR(pci->dbi_base))
1288 return PTR_ERR(pci->dbi_base);
1291 imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
1292 imx6_pcie->gpio_active_high = of_property_read_bool(node,
1293 "reset-gpio-active-high");
1294 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
1295 ret = devm_gpio_request_one(dev, imx6_pcie->reset_gpio,
1296 imx6_pcie->gpio_active_high ?
1297 GPIOF_OUT_INIT_HIGH :
1301 dev_err(dev, "unable to get reset gpio\n");
1304 } else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) {
1305 return imx6_pcie->reset_gpio;
1309 imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
1310 if (IS_ERR(imx6_pcie->pcie_bus))
1311 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_bus),
1312 "pcie_bus clock source missing or invalid\n");
1314 imx6_pcie->pcie = devm_clk_get(dev, "pcie");
1315 if (IS_ERR(imx6_pcie->pcie))
1316 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie),
1317 "pcie clock source missing or invalid\n");
1319 switch (imx6_pcie->drvdata->variant) {
1321 imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
1322 "pcie_inbound_axi");
1323 if (IS_ERR(imx6_pcie->pcie_inbound_axi))
1324 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi),
1325 "pcie_inbound_axi clock missing or invalid\n");
1329 imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
1330 if (IS_ERR(imx6_pcie->pcie_aux))
1331 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
1332 "pcie_aux clock source missing or invalid\n");
1335 if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
1336 imx6_pcie->controller_id = 1;
1338 imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
1340 if (IS_ERR(imx6_pcie->pciephy_reset)) {
1341 dev_err(dev, "Failed to get PCIEPHY reset control\n");
1342 return PTR_ERR(imx6_pcie->pciephy_reset);
1345 imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
1347 if (IS_ERR(imx6_pcie->apps_reset)) {
1348 dev_err(dev, "Failed to get PCIE APPS reset control\n");
1349 return PTR_ERR(imx6_pcie->apps_reset);
1356 imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
1357 if (IS_ERR(imx6_pcie->pcie_aux))
1358 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
1359 "pcie_aux clock source missing or invalid\n");
1360 imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
1362 if (IS_ERR(imx6_pcie->apps_reset))
1363 return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
1364 "failed to get pcie apps reset control\n");
1366 imx6_pcie->phy = devm_phy_get(dev, "pcie-phy");
1367 if (IS_ERR(imx6_pcie->phy))
1368 return dev_err_probe(dev, PTR_ERR(imx6_pcie->phy),
1369 "failed to get pcie phy\n");
1375 /* Don't fetch the pcie_phy clock, if it has abstract PHY driver */
1376 if (imx6_pcie->phy == NULL) {
1377 imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
1378 if (IS_ERR(imx6_pcie->pcie_phy))
1379 return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_phy),
1380 "pcie_phy clock source missing or invalid\n");
1384 /* Grab turnoff reset */
1385 imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
1386 if (IS_ERR(imx6_pcie->turnoff_reset)) {
1387 dev_err(dev, "Failed to get TURNOFF reset control\n");
1388 return PTR_ERR(imx6_pcie->turnoff_reset);
1391 /* Grab GPR config register range */
1392 imx6_pcie->iomuxc_gpr =
1393 syscon_regmap_lookup_by_compatible(imx6_pcie->drvdata->gpr);
1394 if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
1395 dev_err(dev, "unable to find iomuxc registers\n");
1396 return PTR_ERR(imx6_pcie->iomuxc_gpr);
1399 /* Grab PCIe PHY Tx Settings */
1400 if (of_property_read_u32(node, "fsl,tx-deemph-gen1",
1401 &imx6_pcie->tx_deemph_gen1))
1402 imx6_pcie->tx_deemph_gen1 = 0;
1404 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-3p5db",
1405 &imx6_pcie->tx_deemph_gen2_3p5db))
1406 imx6_pcie->tx_deemph_gen2_3p5db = 0;
1408 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-6db",
1409 &imx6_pcie->tx_deemph_gen2_6db))
1410 imx6_pcie->tx_deemph_gen2_6db = 20;
1412 if (of_property_read_u32(node, "fsl,tx-swing-full",
1413 &imx6_pcie->tx_swing_full))
1414 imx6_pcie->tx_swing_full = 127;
1416 if (of_property_read_u32(node, "fsl,tx-swing-low",
1417 &imx6_pcie->tx_swing_low))
1418 imx6_pcie->tx_swing_low = 127;
1420 /* Limit link speed */
1422 of_property_read_u32(node, "fsl,max-link-speed", &pci->link_gen);
1424 imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
1425 if (IS_ERR(imx6_pcie->vpcie)) {
1426 if (PTR_ERR(imx6_pcie->vpcie) != -ENODEV)
1427 return PTR_ERR(imx6_pcie->vpcie);
1428 imx6_pcie->vpcie = NULL;
1431 imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
1432 if (IS_ERR(imx6_pcie->vph)) {
1433 if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
1434 return PTR_ERR(imx6_pcie->vph);
1435 imx6_pcie->vph = NULL;
1438 platform_set_drvdata(pdev, imx6_pcie);
1440 ret = imx6_pcie_attach_pd(dev);
1444 if (imx6_pcie->drvdata->mode == DW_PCIE_EP_TYPE) {
1445 ret = imx6_add_pcie_ep(imx6_pcie, pdev);
1449 ret = dw_pcie_host_init(&pci->pp);
1453 if (pci_msi_enabled()) {
1454 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI);
1456 val = dw_pcie_readw_dbi(pci, offset + PCI_MSI_FLAGS);
1457 val |= PCI_MSI_FLAGS_ENABLE;
1458 dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS, val);
1465 static void imx6_pcie_shutdown(struct platform_device *pdev)
1467 struct imx6_pcie *imx6_pcie = platform_get_drvdata(pdev);
1469 /* bring down link, so bootloader gets clean state in case of reboot */
1470 imx6_pcie_assert_core_reset(imx6_pcie);
1473 static const struct imx6_pcie_drvdata drvdata[] = {
1476 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1477 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
1478 .dbi_length = 0x200,
1479 .gpr = "fsl,imx6q-iomuxc-gpr",
1483 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1484 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
1485 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1486 .gpr = "fsl,imx6q-iomuxc-gpr",
1490 .flags = IMX6_PCIE_FLAG_IMX6_PHY |
1491 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
1492 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1493 .dbi_length = 0x200,
1494 .gpr = "fsl,imx6q-iomuxc-gpr",
1498 .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1499 .gpr = "fsl,imx7d-iomuxc-gpr",
1503 .gpr = "fsl,imx8mq-iomuxc-gpr",
1507 .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1508 .gpr = "fsl,imx8mm-iomuxc-gpr",
1512 .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
1513 .gpr = "fsl,imx8mp-iomuxc-gpr",
1516 .variant = IMX8MQ_EP,
1517 .mode = DW_PCIE_EP_TYPE,
1518 .gpr = "fsl,imx8mq-iomuxc-gpr",
1521 .variant = IMX8MM_EP,
1522 .mode = DW_PCIE_EP_TYPE,
1523 .gpr = "fsl,imx8mm-iomuxc-gpr",
1526 .variant = IMX8MP_EP,
1527 .mode = DW_PCIE_EP_TYPE,
1528 .gpr = "fsl,imx8mp-iomuxc-gpr",
1532 static const struct of_device_id imx6_pcie_of_match[] = {
1533 { .compatible = "fsl,imx6q-pcie", .data = &drvdata[IMX6Q], },
1534 { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], },
1535 { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], },
1536 { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], },
1537 { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
1538 { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
1539 { .compatible = "fsl,imx8mp-pcie", .data = &drvdata[IMX8MP], },
1540 { .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
1541 { .compatible = "fsl,imx8mm-pcie-ep", .data = &drvdata[IMX8MM_EP], },
1542 { .compatible = "fsl,imx8mp-pcie-ep", .data = &drvdata[IMX8MP_EP], },
1546 static struct platform_driver imx6_pcie_driver = {
1548 .name = "imx6q-pcie",
1549 .of_match_table = imx6_pcie_of_match,
1550 .suppress_bind_attrs = true,
1551 .pm = &imx6_pcie_pm_ops,
1552 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1554 .probe = imx6_pcie_probe,
1555 .shutdown = imx6_pcie_shutdown,
1558 static void imx6_pcie_quirk(struct pci_dev *dev)
1560 struct pci_bus *bus = dev->bus;
1561 struct dw_pcie_rp *pp = bus->sysdata;
1563 /* Bus parent is the PCI bridge, its parent is this platform driver */
1564 if (!bus->dev.parent || !bus->dev.parent->parent)
1567 /* Make sure we only quirk devices associated with this driver */
1568 if (bus->dev.parent->parent->driver != &imx6_pcie_driver.driver)
1571 if (pci_is_root_bus(bus)) {
1572 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
1573 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
1576 * Limit config length to avoid the kernel reading beyond
1577 * the register set and causing an abort on i.MX 6Quad
1579 if (imx6_pcie->drvdata->dbi_length) {
1580 dev->cfg_size = imx6_pcie->drvdata->dbi_length;
1581 dev_info(&dev->dev, "Limiting cfg_size to %d\n",
1586 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, 0xabcd,
1587 PCI_CLASS_BRIDGE_PCI, 8, imx6_pcie_quirk);
1589 static int __init imx6_pcie_init(void)
1592 struct device_node *np;
1594 np = of_find_matching_node(NULL, imx6_pcie_of_match);
1600 * Since probe() can be deferred we need to make sure that
1601 * hook_fault_code is not called after __init memory is freed
1602 * by kernel and since imx6q_pcie_abort_handler() is a no-op,
1603 * we can install the handler here without risking it
1604 * accessing some uninitialized driver state.
1606 hook_fault_code(8, imx6q_pcie_abort_handler, SIGBUS, 0,
1607 "external abort on non-linefetch");
1610 return platform_driver_register(&imx6_pcie_driver);
1612 device_initcall(imx6_pcie_init);