1 // SPDX-License-Identifier: GPL-2.0
3 * Freescale i.MX6 PCI Express Root-Complex driver
5 * Copyright (C) 2013 Marek Vasut <marex@denx.de>
7 * Based on upstream Linux kernel driver:
8 * pci-imx6.c: Sean Cross <xobs@kosagi.com>
9 * pcie-designware.c: Jingoo Han <jg1.han@samsung.com>
16 #include <asm/arch/clock.h>
17 #include <asm/arch/iomux.h>
18 #include <asm/arch/crm_regs.h>
22 #include <linux/sizes.h>
24 #include <asm/arch/sys_proto.h>
26 #define PCI_ACCESS_READ 0
27 #define PCI_ACCESS_WRITE 1
30 #define MX6_DBI_ADDR 0x08ffc000
31 #define MX6_IO_ADDR 0x08000000
32 #define MX6_MEM_ADDR 0x08100000
33 #define MX6_ROOT_ADDR 0x08f00000
35 #define MX6_DBI_ADDR 0x01ffc000
36 #define MX6_IO_ADDR 0x01000000
37 #define MX6_MEM_ADDR 0x01100000
38 #define MX6_ROOT_ADDR 0x01f00000
40 #define MX6_DBI_SIZE 0x4000
41 #define MX6_IO_SIZE 0x100000
42 #define MX6_MEM_SIZE 0xe00000
43 #define MX6_ROOT_SIZE 0xfc000
45 /* PCIe Port Logic registers (memory-mapped) */
46 #define PL_OFFSET 0x700
47 #define PCIE_PL_PFLR (PL_OFFSET + 0x08)
48 #define PCIE_PL_PFLR_LINK_STATE_MASK (0x3f << 16)
49 #define PCIE_PL_PFLR_FORCE_LINK (1 << 15)
50 #define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
51 #define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
52 #define PCIE_PHY_DEBUG_R1_LINK_UP (1 << 4)
53 #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (1 << 29)
55 #define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
56 #define PCIE_PHY_CTRL_DATA_LOC 0
57 #define PCIE_PHY_CTRL_CAP_ADR_LOC 16
58 #define PCIE_PHY_CTRL_CAP_DAT_LOC 17
59 #define PCIE_PHY_CTRL_WR_LOC 18
60 #define PCIE_PHY_CTRL_RD_LOC 19
62 #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
63 #define PCIE_PHY_STAT_DATA_LOC 0
64 #define PCIE_PHY_STAT_ACK_LOC 16
66 /* PHY registers (not memory-mapped) */
67 #define PCIE_PHY_RX_ASIC_OUT 0x100D
69 #define PHY_RX_OVRD_IN_LO 0x1005
70 #define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5)
71 #define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3)
73 #define PCIE_PHY_PUP_REQ (1 << 7)
76 #define PCIE_ATU_VIEWPORT 0x900
77 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
78 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
79 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
80 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
81 #define PCIE_ATU_CR1 0x904
82 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
83 #define PCIE_ATU_TYPE_IO (0x2 << 0)
84 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
85 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
86 #define PCIE_ATU_CR2 0x908
87 #define PCIE_ATU_ENABLE (0x1 << 31)
88 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
89 #define PCIE_ATU_LOWER_BASE 0x90C
90 #define PCIE_ATU_UPPER_BASE 0x910
91 #define PCIE_ATU_LIMIT 0x914
92 #define PCIE_ATU_LOWER_TARGET 0x918
93 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
94 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
95 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
96 #define PCIE_ATU_UPPER_TARGET 0x91C
98 struct imx_pcie_priv {
99 void __iomem *dbi_base;
100 void __iomem *cfg_base;
104 * PHY access functions
106 static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val)
109 u32 max_iterations = 10;
110 u32 wait_counter = 0;
113 val = readl(dbi_base + PCIE_PHY_STAT);
114 val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
121 } while (wait_counter < max_iterations);
126 static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr)
131 val = addr << PCIE_PHY_CTRL_DATA_LOC;
132 writel(val, dbi_base + PCIE_PHY_CTRL);
134 val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
135 writel(val, dbi_base + PCIE_PHY_CTRL);
137 ret = pcie_phy_poll_ack(dbi_base, 1);
141 val = addr << PCIE_PHY_CTRL_DATA_LOC;
142 writel(val, dbi_base + PCIE_PHY_CTRL);
144 ret = pcie_phy_poll_ack(dbi_base, 0);
151 /* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
152 static int pcie_phy_read(void __iomem *dbi_base, int addr , int *data)
157 ret = pcie_phy_wait_ack(dbi_base, addr);
161 /* assert Read signal */
162 phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
163 writel(phy_ctl, dbi_base + PCIE_PHY_CTRL);
165 ret = pcie_phy_poll_ack(dbi_base, 1);
169 val = readl(dbi_base + PCIE_PHY_STAT);
170 *data = val & 0xffff;
172 /* deassert Read signal */
173 writel(0x00, dbi_base + PCIE_PHY_CTRL);
175 ret = pcie_phy_poll_ack(dbi_base, 0);
182 static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
189 ret = pcie_phy_wait_ack(dbi_base, addr);
193 var = data << PCIE_PHY_CTRL_DATA_LOC;
194 writel(var, dbi_base + PCIE_PHY_CTRL);
197 var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
198 writel(var, dbi_base + PCIE_PHY_CTRL);
200 ret = pcie_phy_poll_ack(dbi_base, 1);
204 /* deassert cap data */
205 var = data << PCIE_PHY_CTRL_DATA_LOC;
206 writel(var, dbi_base + PCIE_PHY_CTRL);
208 /* wait for ack de-assertion */
209 ret = pcie_phy_poll_ack(dbi_base, 0);
213 /* assert wr signal */
214 var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
215 writel(var, dbi_base + PCIE_PHY_CTRL);
218 ret = pcie_phy_poll_ack(dbi_base, 1);
222 /* deassert wr signal */
223 var = data << PCIE_PHY_CTRL_DATA_LOC;
224 writel(var, dbi_base + PCIE_PHY_CTRL);
226 /* wait for ack de-assertion */
227 ret = pcie_phy_poll_ack(dbi_base, 0);
231 writel(0x0, dbi_base + PCIE_PHY_CTRL);
236 static int imx6_pcie_link_up(struct imx_pcie_priv *priv)
241 /* link is debug bit 36, debug register 1 starts at bit 32 */
242 rc = readl(priv->dbi_base + PCIE_PHY_DEBUG_R1);
243 if ((rc & PCIE_PHY_DEBUG_R1_LINK_UP) &&
244 !(rc & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING))
248 * From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
249 * Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2).
250 * If (MAC/LTSSM.state == Recovery.RcvrLock)
251 * && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
254 pcie_phy_read(priv->dbi_base, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
255 ltssm = readl(priv->dbi_base + PCIE_PHY_DEBUG_R0) & 0x3F;
263 printf("transition to gen2 is stuck, reset PHY!\n");
265 pcie_phy_read(priv->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
266 temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
267 pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
271 pcie_phy_read(priv->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
272 temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
273 pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
281 static int imx_pcie_regions_setup(struct imx_pcie_priv *priv)
284 * i.MX6 defines 16MB in the AXI address map for PCIe.
286 * That address space excepted the pcie registers is
287 * split and defined into different regions by iATU,
288 * with sizes and offsets as follows:
290 * 0x0100_0000 --- 0x010F_FFFF 1MB IORESOURCE_IO
291 * 0x0110_0000 --- 0x01EF_FFFF 14MB IORESOURCE_MEM
292 * 0x01F0_0000 --- 0x01FF_FFFF 1MB Cfg + Registers
295 /* CMD reg:I/O space, MEM space, and Bus Master Enable */
296 setbits_le32(priv->dbi_base + PCI_COMMAND,
297 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
299 /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
300 setbits_le32(priv->dbi_base + PCI_CLASS_REVISION,
301 PCI_CLASS_BRIDGE_PCI << 16);
303 /* Region #0 is used for Outbound CFG space access. */
304 writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
306 writel(lower_32_bits((uintptr_t)priv->cfg_base),
307 priv->dbi_base + PCIE_ATU_LOWER_BASE);
308 writel(upper_32_bits((uintptr_t)priv->cfg_base),
309 priv->dbi_base + PCIE_ATU_UPPER_BASE);
310 writel(lower_32_bits((uintptr_t)priv->cfg_base + MX6_ROOT_SIZE),
311 priv->dbi_base + PCIE_ATU_LIMIT);
313 writel(0, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
314 writel(0, priv->dbi_base + PCIE_ATU_UPPER_TARGET);
315 writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
316 writel(PCIE_ATU_ENABLE, priv->dbi_base + PCIE_ATU_CR2);
322 * PCI Express accessors
324 static void __iomem *get_bus_address(struct imx_pcie_priv *priv,
325 pci_dev_t d, int where)
327 void __iomem *va_address;
329 /* Reconfigure Region #0 */
330 writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
333 writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
335 writel(PCIE_ATU_TYPE_CFG1, priv->dbi_base + PCIE_ATU_CR1);
337 if (PCI_BUS(d) == 0) {
338 va_address = priv->dbi_base;
340 writel(d << 8, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
341 va_address = priv->cfg_base;
344 va_address += (where & ~0x3);
349 static int imx_pcie_addr_valid(pci_dev_t d)
351 if ((PCI_BUS(d) == 0) && (PCI_DEV(d) > 1))
353 if ((PCI_BUS(d) == 1) && (PCI_DEV(d) > 0))
359 * Replace the original ARM DABT handler with a simple jump-back one.
361 * The problem here is that if we have a PCIe bridge attached to this PCIe
362 * controller, but no PCIe device is connected to the bridges' downstream
363 * port, the attempt to read/write from/to the config space will produce
364 * a DABT. This is a behavior of the controller and can not be disabled
367 * To work around the problem, we backup the current DABT handler address
368 * and replace it with our own DABT handler, which only bounces right back
371 static void imx_pcie_fix_dabt_handler(bool set)
373 extern uint32_t *_data_abort;
374 uint32_t *data_abort_addr = (uint32_t *)&_data_abort;
376 static const uint32_t data_abort_bounce_handler = 0xe25ef004;
377 uint32_t data_abort_bounce_addr = (uint32_t)&data_abort_bounce_handler;
379 static uint32_t data_abort_backup;
382 data_abort_backup = *data_abort_addr;
383 *data_abort_addr = data_abort_bounce_addr;
385 *data_abort_addr = data_abort_backup;
389 static int imx_pcie_read_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
392 void __iomem *va_address;
395 ret = imx_pcie_addr_valid(d);
401 va_address = get_bus_address(priv, d, where);
404 * Read the PCIe config space. We must replace the DABT handler
405 * here in case we got data abort from the PCIe controller, see
406 * imx_pcie_fix_dabt_handler() description. Note that writing the
407 * "val" with valid value is also imperative here as in case we
408 * did got DABT, the val would contain random value.
410 imx_pcie_fix_dabt_handler(true);
411 writel(0xffffffff, val);
412 *val = readl(va_address);
413 imx_pcie_fix_dabt_handler(false);
418 static int imx_pcie_write_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
421 void __iomem *va_address = NULL;
424 ret = imx_pcie_addr_valid(d);
428 va_address = get_bus_address(priv, d, where);
431 * Write the PCIe config space. We must replace the DABT handler
432 * here in case we got data abort from the PCIe controller, see
433 * imx_pcie_fix_dabt_handler() description.
435 imx_pcie_fix_dabt_handler(true);
436 writel(val, va_address);
437 imx_pcie_fix_dabt_handler(false);
445 static int imx6_pcie_assert_core_reset(struct imx_pcie_priv *priv,
446 bool prepare_for_boot)
448 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
451 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_PCIE_SW_RST);
453 #if defined(CONFIG_MX6SX)
454 struct gpc *gpc_regs = (struct gpc *)GPC_BASE_ADDR;
456 /* SSP_EN is not used on MX6SX anymore */
457 setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_TEST_POWERDOWN);
458 /* Force PCIe PHY reset */
459 setbits_le32(&iomuxc_regs->gpr[5], IOMUXC_GPR5_PCIE_BTNRST);
460 /* Power up PCIe PHY */
461 setbits_le32(&gpc_regs->cntr, PCIE_PHY_PUP_REQ);
464 * If the bootloader already enabled the link we need some special
465 * handling to get the core back into a state where it is safe to
466 * touch it for configuration. As there is no dedicated reset signal
467 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
468 * state before completely disabling LTSSM, which is a prerequisite
469 * for core configuration.
471 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
472 * indication that the bootloader activated the link.
474 if (is_mx6dq() && prepare_for_boot) {
475 u32 val, gpr1, gpr12;
477 gpr1 = readl(&iomuxc_regs->gpr[1]);
478 gpr12 = readl(&iomuxc_regs->gpr[12]);
479 if ((gpr1 & IOMUXC_GPR1_PCIE_REF_CLK_EN) &&
480 (gpr12 & IOMUXC_GPR12_PCIE_CTL_2)) {
481 val = readl(priv->dbi_base + PCIE_PL_PFLR);
482 val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
483 val |= PCIE_PL_PFLR_FORCE_LINK;
485 imx_pcie_fix_dabt_handler(true);
486 writel(val, priv->dbi_base + PCIE_PL_PFLR);
487 imx_pcie_fix_dabt_handler(false);
489 gpr12 &= ~IOMUXC_GPR12_PCIE_CTL_2;
490 writel(val, &iomuxc_regs->gpr[12]);
493 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
494 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
500 static int imx6_pcie_init_phy(void)
502 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
504 clrbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE);
506 clrsetbits_le32(&iomuxc_regs->gpr[12],
507 IOMUXC_GPR12_DEVICE_TYPE_MASK,
508 IOMUXC_GPR12_DEVICE_TYPE_RC);
509 clrsetbits_le32(&iomuxc_regs->gpr[12],
510 IOMUXC_GPR12_LOS_LEVEL_MASK,
511 IOMUXC_GPR12_LOS_LEVEL_9);
514 clrsetbits_le32(&iomuxc_regs->gpr[12],
515 IOMUXC_GPR12_RX_EQ_MASK,
516 IOMUXC_GPR12_RX_EQ_2);
519 writel((0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN1_OFFSET) |
520 (0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_3P5DB_OFFSET) |
521 (20 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_6DB_OFFSET) |
522 (127 << IOMUXC_GPR8_PCS_TX_SWING_FULL_OFFSET) |
523 (127 << IOMUXC_GPR8_PCS_TX_SWING_LOW_OFFSET),
524 &iomuxc_regs->gpr[8]);
529 __weak int imx6_pcie_toggle_power(void)
531 #ifdef CONFIG_PCIE_IMX_POWER_GPIO
532 gpio_request(CONFIG_PCIE_IMX_POWER_GPIO, "pcie_power");
533 gpio_direction_output(CONFIG_PCIE_IMX_POWER_GPIO, 0);
535 gpio_set_value(CONFIG_PCIE_IMX_POWER_GPIO, 1);
537 gpio_free(CONFIG_PCIE_IMX_POWER_GPIO);
542 __weak int imx6_pcie_toggle_reset(void)
545 * See 'PCI EXPRESS BASE SPECIFICATION, REV 3.0, SECTION 6.6.1'
546 * for detailed understanding of the PCIe CR reset logic.
548 * The PCIe #PERST reset line _MUST_ be connected, otherwise your
549 * design does not conform to the specification. You must wait at
550 * least 20 ms after de-asserting the #PERST so the EP device can
551 * do self-initialisation.
553 * In case your #PERST pin is connected to a plain GPIO pin of the
554 * CPU, you can define CONFIG_PCIE_IMX_PERST_GPIO in your board's
555 * configuration file and the condition below will handle the rest
556 * of the reset toggling.
558 * In case your #PERST toggling logic is more complex, for example
559 * connected via CPLD or somesuch, you can override this function
560 * in your board file and implement reset logic as needed. You must
561 * not forget to wait at least 20 ms after de-asserting #PERST in
562 * this case either though.
564 * In case your #PERST line of the PCIe EP device is not connected
565 * at all, your design is broken and you should fix your design,
566 * otherwise you will observe problems like for example the link
567 * not coming up after rebooting the system back from running Linux
568 * that uses the PCIe as well OR the PCIe link might not come up in
569 * Linux at all in the first place since it's in some non-reset
570 * state due to being previously used in U-Boot.
572 #ifdef CONFIG_PCIE_IMX_PERST_GPIO
573 gpio_request(CONFIG_PCIE_IMX_PERST_GPIO, "pcie_reset");
574 gpio_direction_output(CONFIG_PCIE_IMX_PERST_GPIO, 0);
576 gpio_set_value(CONFIG_PCIE_IMX_PERST_GPIO, 1);
578 gpio_free(CONFIG_PCIE_IMX_PERST_GPIO);
580 puts("WARNING: Make sure the PCIe #PERST line is connected!\n");
585 static int imx6_pcie_deassert_core_reset(void)
587 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
589 imx6_pcie_toggle_power();
594 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_PCIE_SW_RST);
597 * Wait for the clock to settle a bit, when the clock are sourced
598 * from the CPU, we need about 30 ms to settle.
602 #if defined(CONFIG_MX6SX)
603 /* SSP_EN is not used on MX6SX anymore */
604 clrbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_TEST_POWERDOWN);
605 /* Clear PCIe PHY reset bit */
606 clrbits_le32(&iomuxc_regs->gpr[5], IOMUXC_GPR5_PCIE_BTNRST);
609 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
610 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
613 imx6_pcie_toggle_reset();
618 static int imx_pcie_link_up(struct imx_pcie_priv *priv)
620 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
624 imx6_pcie_assert_core_reset(priv, false);
625 imx6_pcie_init_phy();
626 imx6_pcie_deassert_core_reset();
628 imx_pcie_regions_setup(priv);
631 * By default, the subordinate is set equally to the secondary
632 * bus (0x01) when the RC boots.
633 * This means that theoretically, only bus 1 is reachable from the RC.
634 * Force the PCIe RC subordinate to 0xff, otherwise no downstream
635 * devices will be detected if the enumeration is applied strictly.
637 tmp = readl(priv->dbi_base + 0x18);
639 writel(tmp, priv->dbi_base + 0x18);
642 * FIXME: Force the PCIe RC to Gen1 operation
643 * The RC must be forced into Gen1 mode before bringing the link
644 * up, otherwise no downstream devices are detected. After the
645 * link is up, a managed Gen1->Gen2 transition can be initiated.
647 tmp = readl(priv->dbi_base + 0x7c);
650 writel(tmp, priv->dbi_base + 0x7c);
652 /* LTSSM enable, starting link. */
653 setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE);
655 while (!imx6_pcie_link_up(priv)) {
659 #ifdef CONFIG_PCI_SCAN_SHOW
660 puts("PCI: pcie phy link never came up\n");
662 debug("DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
663 readl(priv->dbi_base + PCIE_PHY_DEBUG_R0),
664 readl(priv->dbi_base + PCIE_PHY_DEBUG_R1));
672 #if !CONFIG_IS_ENABLED(DM_PCI)
673 static struct imx_pcie_priv imx_pcie_priv = {
674 .dbi_base = (void __iomem *)MX6_DBI_ADDR,
675 .cfg_base = (void __iomem *)MX6_ROOT_ADDR,
678 static struct imx_pcie_priv *priv = &imx_pcie_priv;
680 static int imx_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
683 struct imx_pcie_priv *priv = hose->priv_data;
685 return imx_pcie_read_cfg(priv, d, where, val);
688 static int imx_pcie_write_config(struct pci_controller *hose, pci_dev_t d,
691 struct imx_pcie_priv *priv = hose->priv_data;
693 return imx_pcie_write_cfg(priv, d, where, val);
696 void imx_pcie_init(void)
698 /* Static instance of the controller. */
699 static struct pci_controller pcc;
700 struct pci_controller *hose = &pcc;
703 memset(&pcc, 0, sizeof(pcc));
705 hose->priv_data = priv;
708 pci_set_region(&hose->regions[0],
709 MX6_IO_ADDR, MX6_IO_ADDR,
710 MX6_IO_SIZE, PCI_REGION_IO);
712 /* PCI memory space */
713 pci_set_region(&hose->regions[1],
714 MX6_MEM_ADDR, MX6_MEM_ADDR,
715 MX6_MEM_SIZE, PCI_REGION_MEM);
717 /* System memory space */
718 pci_set_region(&hose->regions[2],
719 MMDC0_ARB_BASE_ADDR, MMDC0_ARB_BASE_ADDR,
720 0xefffffff, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
722 hose->region_count = 3;
725 pci_hose_read_config_byte_via_dword,
726 pci_hose_read_config_word_via_dword,
727 imx_pcie_read_config,
728 pci_hose_write_config_byte_via_dword,
729 pci_hose_write_config_word_via_dword,
730 imx_pcie_write_config);
732 /* Start the controller. */
733 ret = imx_pcie_link_up(priv);
736 pci_register_hose(hose);
737 hose->last_busno = pci_hose_scan(hose);
741 void imx_pcie_remove(void)
743 imx6_pcie_assert_core_reset(priv, true);
746 /* Probe function. */
747 void pci_init_board(void)
752 static int imx_pcie_dm_read_config(const struct udevice *dev, pci_dev_t bdf,
753 uint offset, ulong *value,
754 enum pci_size_t size)
756 struct imx_pcie_priv *priv = dev_get_priv(dev);
760 ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
764 *value = pci_conv_32_to_size(tmpval, offset, size);
768 static int imx_pcie_dm_write_config(struct udevice *dev, pci_dev_t bdf,
769 uint offset, ulong value,
770 enum pci_size_t size)
772 struct imx_pcie_priv *priv = dev_get_priv(dev);
776 ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
780 newval = pci_conv_size_to_32(tmpval, value, offset, size);
781 return imx_pcie_write_cfg(priv, bdf, offset, newval);
784 static int imx_pcie_dm_probe(struct udevice *dev)
786 struct imx_pcie_priv *priv = dev_get_priv(dev);
788 return imx_pcie_link_up(priv);
791 static int imx_pcie_dm_remove(struct udevice *dev)
793 struct imx_pcie_priv *priv = dev_get_priv(dev);
795 imx6_pcie_assert_core_reset(priv, true);
800 static int imx_pcie_ofdata_to_platdata(struct udevice *dev)
802 struct imx_pcie_priv *priv = dev_get_priv(dev);
804 priv->dbi_base = (void __iomem *)devfdt_get_addr_index(dev, 0);
805 priv->cfg_base = (void __iomem *)devfdt_get_addr_index(dev, 1);
806 if (!priv->dbi_base || !priv->cfg_base)
812 static const struct dm_pci_ops imx_pcie_ops = {
813 .read_config = imx_pcie_dm_read_config,
814 .write_config = imx_pcie_dm_write_config,
817 static const struct udevice_id imx_pcie_ids[] = {
818 { .compatible = "fsl,imx6q-pcie" },
819 { .compatible = "fsl,imx6sx-pcie" },
823 U_BOOT_DRIVER(imx_pcie) = {
826 .of_match = imx_pcie_ids,
827 .ops = &imx_pcie_ops,
828 .probe = imx_pcie_dm_probe,
829 .remove = imx_pcie_dm_remove,
830 .ofdata_to_platdata = imx_pcie_ofdata_to_platdata,
831 .priv_auto_alloc_size = sizeof(struct imx_pcie_priv),
832 .flags = DM_FLAG_OS_PREPARE,