2 * PCIe host controller driver for Freescale i.MX6 SoCs
4 * Copyright (C) 2013 Kosagi
5 * http://www.kosagi.com
7 * Author: Sean Cross <xobs@kosagi.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/gpio.h>
17 #include <linux/kernel.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
20 #include <linux/module.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_device.h>
23 #include <linux/pci.h>
24 #include <linux/platform_device.h>
25 #include <linux/regmap.h>
26 #include <linux/resource.h>
27 #include <linux/signal.h>
28 #include <linux/types.h>
29 #include <linux/interrupt.h>
31 #include "pcie-designware.h"
33 #define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp)
35 enum imx6_pcie_variants {
43 bool gpio_active_high;
46 struct clk *pcie_inbound_axi;
49 struct regmap *iomuxc_gpr;
50 enum imx6_pcie_variants variant;
52 u32 tx_deemph_gen2_3p5db;
53 u32 tx_deemph_gen2_6db;
59 /* PCIe Root Complex registers (memory-mapped) */
60 #define PCIE_RC_LCR 0x7c
61 #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1
62 #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2 0x2
63 #define PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK 0xf
65 #define PCIE_RC_LCSR 0x80
67 /* PCIe Port Logic registers (memory-mapped) */
68 #define PL_OFFSET 0x700
69 #define PCIE_PL_PFLR (PL_OFFSET + 0x08)
70 #define PCIE_PL_PFLR_LINK_STATE_MASK (0x3f << 16)
71 #define PCIE_PL_PFLR_FORCE_LINK (1 << 15)
72 #define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
73 #define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
74 #define PCIE_PHY_DEBUG_R1_XMLH_LINK_IN_TRAINING (1 << 29)
75 #define PCIE_PHY_DEBUG_R1_XMLH_LINK_UP (1 << 4)
77 #define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
78 #define PCIE_PHY_CTRL_DATA_LOC 0
79 #define PCIE_PHY_CTRL_CAP_ADR_LOC 16
80 #define PCIE_PHY_CTRL_CAP_DAT_LOC 17
81 #define PCIE_PHY_CTRL_WR_LOC 18
82 #define PCIE_PHY_CTRL_RD_LOC 19
84 #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
85 #define PCIE_PHY_STAT_ACK_LOC 16
87 #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
88 #define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
90 /* PHY registers (not memory-mapped) */
91 #define PCIE_PHY_RX_ASIC_OUT 0x100D
92 #define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
94 #define PHY_RX_OVRD_IN_LO 0x1005
95 #define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5)
96 #define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3)
98 static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val)
101 u32 max_iterations = 10;
102 u32 wait_counter = 0;
105 val = readl(dbi_base + PCIE_PHY_STAT);
106 val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
113 } while (wait_counter < max_iterations);
118 static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr)
123 val = addr << PCIE_PHY_CTRL_DATA_LOC;
124 writel(val, dbi_base + PCIE_PHY_CTRL);
126 val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
127 writel(val, dbi_base + PCIE_PHY_CTRL);
129 ret = pcie_phy_poll_ack(dbi_base, 1);
133 val = addr << PCIE_PHY_CTRL_DATA_LOC;
134 writel(val, dbi_base + PCIE_PHY_CTRL);
136 return pcie_phy_poll_ack(dbi_base, 0);
139 /* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
140 static int pcie_phy_read(void __iomem *dbi_base, int addr, int *data)
145 ret = pcie_phy_wait_ack(dbi_base, addr);
149 /* assert Read signal */
150 phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
151 writel(phy_ctl, dbi_base + PCIE_PHY_CTRL);
153 ret = pcie_phy_poll_ack(dbi_base, 1);
157 val = readl(dbi_base + PCIE_PHY_STAT);
158 *data = val & 0xffff;
160 /* deassert Read signal */
161 writel(0x00, dbi_base + PCIE_PHY_CTRL);
163 return pcie_phy_poll_ack(dbi_base, 0);
166 static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
173 ret = pcie_phy_wait_ack(dbi_base, addr);
177 var = data << PCIE_PHY_CTRL_DATA_LOC;
178 writel(var, dbi_base + PCIE_PHY_CTRL);
181 var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
182 writel(var, dbi_base + PCIE_PHY_CTRL);
184 ret = pcie_phy_poll_ack(dbi_base, 1);
188 /* deassert cap data */
189 var = data << PCIE_PHY_CTRL_DATA_LOC;
190 writel(var, dbi_base + PCIE_PHY_CTRL);
192 /* wait for ack de-assertion */
193 ret = pcie_phy_poll_ack(dbi_base, 0);
197 /* assert wr signal */
198 var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
199 writel(var, dbi_base + PCIE_PHY_CTRL);
202 ret = pcie_phy_poll_ack(dbi_base, 1);
206 /* deassert wr signal */
207 var = data << PCIE_PHY_CTRL_DATA_LOC;
208 writel(var, dbi_base + PCIE_PHY_CTRL);
210 /* wait for ack de-assertion */
211 ret = pcie_phy_poll_ack(dbi_base, 0);
215 writel(0x0, dbi_base + PCIE_PHY_CTRL);
220 static void imx6_pcie_reset_phy(struct pcie_port *pp)
224 pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &tmp);
225 tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
226 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
227 pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, tmp);
229 usleep_range(2000, 3000);
231 pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &tmp);
232 tmp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
233 PHY_RX_OVRD_IN_LO_RX_PLL_EN);
234 pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, tmp);
237 /* Added for PCI abort handling */
238 static int imx6q_pcie_abort_handler(unsigned long addr,
239 unsigned int fsr, struct pt_regs *regs)
244 static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
246 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
247 u32 val, gpr1, gpr12;
249 switch (imx6_pcie->variant) {
251 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
252 IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
253 IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
254 /* Force PCIe PHY reset */
255 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
256 IMX6SX_GPR5_PCIE_BTNRST_RESET,
257 IMX6SX_GPR5_PCIE_BTNRST_RESET);
260 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
261 IMX6Q_GPR1_PCIE_SW_RST,
262 IMX6Q_GPR1_PCIE_SW_RST);
266 * If the bootloader already enabled the link we need some
267 * special handling to get the core back into a state where
268 * it is safe to touch it for configuration. As there is
269 * no dedicated reset signal wired up for MX6QDL, we need
270 * to manually force LTSSM into "detect" state before
271 * completely disabling LTSSM, which is a prerequisite for
272 * core configuration.
274 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we
275 * have a strong indication that the bootloader activated
278 regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
279 regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
281 if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
282 (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
283 val = readl(pp->dbi_base + PCIE_PL_PFLR);
284 val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
285 val |= PCIE_PL_PFLR_FORCE_LINK;
286 writel(val, pp->dbi_base + PCIE_PL_PFLR);
288 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
289 IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
292 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
293 IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
294 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
295 IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
302 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
304 struct pcie_port *pp = &imx6_pcie->pp;
305 struct device *dev = pp->dev;
308 switch (imx6_pcie->variant) {
310 ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
312 dev_err(dev, "unable to enable pcie_axi clock\n");
316 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
317 IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
319 case IMX6QP: /* FALLTHROUGH */
321 /* power up core phy and enable ref clock */
322 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
323 IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
325 * the async reset input need ref clock to sync internally,
326 * when the ref clock comes after reset, internal synced
327 * reset time is too short, cannot meet the requirement.
328 * add one ~10us delay here.
331 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
332 IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
339 static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
341 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
342 struct device *dev = pp->dev;
345 ret = clk_prepare_enable(imx6_pcie->pcie_phy);
347 dev_err(dev, "unable to enable pcie_phy clock\n");
351 ret = clk_prepare_enable(imx6_pcie->pcie_bus);
353 dev_err(dev, "unable to enable pcie_bus clock\n");
357 ret = clk_prepare_enable(imx6_pcie->pcie);
359 dev_err(dev, "unable to enable pcie clock\n");
363 ret = imx6_pcie_enable_ref_clk(imx6_pcie);
365 dev_err(dev, "unable to enable pcie ref clock\n");
369 /* allow the clocks to stabilize */
370 usleep_range(200, 500);
372 /* Some boards don't have PCIe reset GPIO. */
373 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
374 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
375 imx6_pcie->gpio_active_high);
377 gpio_set_value_cansleep(imx6_pcie->reset_gpio,
378 !imx6_pcie->gpio_active_high);
381 switch (imx6_pcie->variant) {
383 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
384 IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
387 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
388 IMX6Q_GPR1_PCIE_SW_RST, 0);
390 usleep_range(200, 500);
392 case IMX6Q: /* Nothing to do */
399 clk_disable_unprepare(imx6_pcie->pcie);
401 clk_disable_unprepare(imx6_pcie->pcie_bus);
403 clk_disable_unprepare(imx6_pcie->pcie_phy);
408 static void imx6_pcie_init_phy(struct pcie_port *pp)
410 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
412 if (imx6_pcie->variant == IMX6SX)
413 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
414 IMX6SX_GPR12_PCIE_RX_EQ_MASK,
415 IMX6SX_GPR12_PCIE_RX_EQ_2);
417 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
418 IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
420 /* configure constant input signal to the pcie ctrl and phy */
421 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
422 IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12);
423 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
424 IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
426 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
427 IMX6Q_GPR8_TX_DEEMPH_GEN1,
428 imx6_pcie->tx_deemph_gen1 << 0);
429 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
430 IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
431 imx6_pcie->tx_deemph_gen2_3p5db << 6);
432 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
433 IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
434 imx6_pcie->tx_deemph_gen2_6db << 12);
435 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
436 IMX6Q_GPR8_TX_SWING_FULL,
437 imx6_pcie->tx_swing_full << 18);
438 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
439 IMX6Q_GPR8_TX_SWING_LOW,
440 imx6_pcie->tx_swing_low << 25);
443 static int imx6_pcie_wait_for_link(struct pcie_port *pp)
445 struct device *dev = pp->dev;
447 /* check if the link is up or not */
448 if (!dw_pcie_wait_for_link(pp))
451 dev_dbg(dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
452 readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
453 readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
457 static int imx6_pcie_wait_for_speed_change(struct pcie_port *pp)
459 struct device *dev = pp->dev;
461 unsigned int retries;
463 for (retries = 0; retries < 200; retries++) {
464 tmp = readl(pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
465 /* Test if the speed change finished. */
466 if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
468 usleep_range(100, 1000);
471 dev_err(dev, "Speed change timeout\n");
475 static irqreturn_t imx6_pcie_msi_handler(int irq, void *arg)
477 struct pcie_port *pp = arg;
479 return dw_handle_msi_irq(pp);
482 static int imx6_pcie_establish_link(struct pcie_port *pp)
484 struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
485 struct device *dev = pp->dev;
490 * Force Gen1 operation when starting the link. In case the link is
491 * started in Gen2 mode, there is a possibility the devices on the
492 * bus will not be detected at all. This happens with PCIe switches.
494 tmp = readl(pp->dbi_base + PCIE_RC_LCR);
495 tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
496 tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1;
497 writel(tmp, pp->dbi_base + PCIE_RC_LCR);
500 regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
501 IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
503 ret = imx6_pcie_wait_for_link(pp);
505 dev_info(dev, "Link never came up\n");
509 if (imx6_pcie->link_gen == 2) {
510 /* Allow Gen2 mode after the link is up. */
511 tmp = readl(pp->dbi_base + PCIE_RC_LCR);
512 tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
513 tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2;
514 writel(tmp, pp->dbi_base + PCIE_RC_LCR);
516 dev_info(dev, "Link: Gen2 disabled\n");
520 * Start Directed Speed Change so the best possible speed both link
521 * partners support can be negotiated.
523 tmp = readl(pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
524 tmp |= PORT_LOGIC_SPEED_CHANGE;
525 writel(tmp, pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
527 ret = imx6_pcie_wait_for_speed_change(pp);
529 dev_err(dev, "Failed to bring link up!\n");
533 /* Make sure link training is finished as well! */
534 ret = imx6_pcie_wait_for_link(pp);
536 dev_err(dev, "Failed to bring link up!\n");
540 tmp = readl(pp->dbi_base + PCIE_RC_LCSR);
541 dev_info(dev, "Link up, Gen%i\n", (tmp >> 16) & 0xf);
545 dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
546 readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
547 readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
548 imx6_pcie_reset_phy(pp);
553 static void imx6_pcie_host_init(struct pcie_port *pp)
555 imx6_pcie_assert_core_reset(pp);
557 imx6_pcie_init_phy(pp);
559 imx6_pcie_deassert_core_reset(pp);
561 dw_pcie_setup_rc(pp);
563 imx6_pcie_establish_link(pp);
565 if (IS_ENABLED(CONFIG_PCI_MSI))
566 dw_pcie_msi_init(pp);
569 static int imx6_pcie_link_up(struct pcie_port *pp)
571 return readl(pp->dbi_base + PCIE_PHY_DEBUG_R1) &
572 PCIE_PHY_DEBUG_R1_XMLH_LINK_UP;
575 static struct pcie_host_ops imx6_pcie_host_ops = {
576 .link_up = imx6_pcie_link_up,
577 .host_init = imx6_pcie_host_init,
580 static int __init imx6_add_pcie_port(struct pcie_port *pp,
581 struct platform_device *pdev)
583 struct device *dev = pp->dev;
586 if (IS_ENABLED(CONFIG_PCI_MSI)) {
587 pp->msi_irq = platform_get_irq_byname(pdev, "msi");
588 if (pp->msi_irq <= 0) {
589 dev_err(dev, "failed to get MSI irq\n");
593 ret = devm_request_irq(dev, pp->msi_irq,
594 imx6_pcie_msi_handler,
595 IRQF_SHARED | IRQF_NO_THREAD,
598 dev_err(dev, "failed to request MSI irq\n");
603 pp->root_bus_nr = -1;
604 pp->ops = &imx6_pcie_host_ops;
606 ret = dw_pcie_host_init(pp);
608 dev_err(dev, "failed to initialize host\n");
615 static int __init imx6_pcie_probe(struct platform_device *pdev)
617 struct device *dev = &pdev->dev;
618 struct imx6_pcie *imx6_pcie;
619 struct pcie_port *pp;
620 struct resource *dbi_base;
621 struct device_node *node = dev->of_node;
624 imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL);
632 (enum imx6_pcie_variants)of_device_get_match_data(dev);
634 /* Added for PCI abort handling */
635 hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
636 "imprecise external abort");
638 dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
639 pp->dbi_base = devm_ioremap_resource(dev, dbi_base);
640 if (IS_ERR(pp->dbi_base))
641 return PTR_ERR(pp->dbi_base);
644 imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
645 imx6_pcie->gpio_active_high = of_property_read_bool(node,
646 "reset-gpio-active-high");
647 if (gpio_is_valid(imx6_pcie->reset_gpio)) {
648 ret = devm_gpio_request_one(dev, imx6_pcie->reset_gpio,
649 imx6_pcie->gpio_active_high ?
650 GPIOF_OUT_INIT_HIGH :
654 dev_err(dev, "unable to get reset gpio\n");
660 imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
661 if (IS_ERR(imx6_pcie->pcie_phy)) {
662 dev_err(dev, "pcie_phy clock source missing or invalid\n");
663 return PTR_ERR(imx6_pcie->pcie_phy);
666 imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
667 if (IS_ERR(imx6_pcie->pcie_bus)) {
668 dev_err(dev, "pcie_bus clock source missing or invalid\n");
669 return PTR_ERR(imx6_pcie->pcie_bus);
672 imx6_pcie->pcie = devm_clk_get(dev, "pcie");
673 if (IS_ERR(imx6_pcie->pcie)) {
674 dev_err(dev, "pcie clock source missing or invalid\n");
675 return PTR_ERR(imx6_pcie->pcie);
678 if (imx6_pcie->variant == IMX6SX) {
679 imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
681 if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
683 "pcie_incbound_axi clock missing or invalid\n");
684 return PTR_ERR(imx6_pcie->pcie_inbound_axi);
688 /* Grab GPR config register range */
689 imx6_pcie->iomuxc_gpr =
690 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
691 if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
692 dev_err(dev, "unable to find iomuxc registers\n");
693 return PTR_ERR(imx6_pcie->iomuxc_gpr);
696 /* Grab PCIe PHY Tx Settings */
697 if (of_property_read_u32(node, "fsl,tx-deemph-gen1",
698 &imx6_pcie->tx_deemph_gen1))
699 imx6_pcie->tx_deemph_gen1 = 0;
701 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-3p5db",
702 &imx6_pcie->tx_deemph_gen2_3p5db))
703 imx6_pcie->tx_deemph_gen2_3p5db = 0;
705 if (of_property_read_u32(node, "fsl,tx-deemph-gen2-6db",
706 &imx6_pcie->tx_deemph_gen2_6db))
707 imx6_pcie->tx_deemph_gen2_6db = 20;
709 if (of_property_read_u32(node, "fsl,tx-swing-full",
710 &imx6_pcie->tx_swing_full))
711 imx6_pcie->tx_swing_full = 127;
713 if (of_property_read_u32(node, "fsl,tx-swing-low",
714 &imx6_pcie->tx_swing_low))
715 imx6_pcie->tx_swing_low = 127;
717 /* Limit link speed */
718 ret = of_property_read_u32(node, "fsl,max-link-speed",
719 &imx6_pcie->link_gen);
721 imx6_pcie->link_gen = 1;
723 ret = imx6_add_pcie_port(pp, pdev);
727 platform_set_drvdata(pdev, imx6_pcie);
731 static void imx6_pcie_shutdown(struct platform_device *pdev)
733 struct imx6_pcie *imx6_pcie = platform_get_drvdata(pdev);
735 /* bring down link, so bootloader gets clean state in case of reboot */
736 imx6_pcie_assert_core_reset(&imx6_pcie->pp);
739 static const struct of_device_id imx6_pcie_of_match[] = {
740 { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, },
741 { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, },
742 { .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, },
746 static struct platform_driver imx6_pcie_driver = {
748 .name = "imx6q-pcie",
749 .of_match_table = imx6_pcie_of_match,
751 .shutdown = imx6_pcie_shutdown,
754 static int __init imx6_pcie_init(void)
756 return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe);
758 device_initcall(imx6_pcie_init);