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>
17 #include <asm/arch/clock.h>
18 #include <asm/arch/iomux.h>
19 #include <asm/arch/crm_regs.h>
23 #include <linux/sizes.h>
25 #include <asm/arch/sys_proto.h>
27 #define PCI_ACCESS_READ 0
28 #define PCI_ACCESS_WRITE 1
31 #define MX6_DBI_ADDR 0x08ffc000
32 #define MX6_IO_ADDR 0x08000000
33 #define MX6_MEM_ADDR 0x08100000
34 #define MX6_ROOT_ADDR 0x08f00000
36 #define MX6_DBI_ADDR 0x01ffc000
37 #define MX6_IO_ADDR 0x01000000
38 #define MX6_MEM_ADDR 0x01100000
39 #define MX6_ROOT_ADDR 0x01f00000
41 #define MX6_DBI_SIZE 0x4000
42 #define MX6_IO_SIZE 0x100000
43 #define MX6_MEM_SIZE 0xe00000
44 #define MX6_ROOT_SIZE 0xfc000
46 /* PCIe Port Logic registers (memory-mapped) */
47 #define PL_OFFSET 0x700
48 #define PCIE_PL_PFLR (PL_OFFSET + 0x08)
49 #define PCIE_PL_PFLR_LINK_STATE_MASK (0x3f << 16)
50 #define PCIE_PL_PFLR_FORCE_LINK (1 << 15)
51 #define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
52 #define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
53 #define PCIE_PHY_DEBUG_R1_LINK_UP (1 << 4)
54 #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (1 << 29)
56 #define PCIE_PHY_CTRL (PL_OFFSET + 0x114)
57 #define PCIE_PHY_CTRL_DATA_LOC 0
58 #define PCIE_PHY_CTRL_CAP_ADR_LOC 16
59 #define PCIE_PHY_CTRL_CAP_DAT_LOC 17
60 #define PCIE_PHY_CTRL_WR_LOC 18
61 #define PCIE_PHY_CTRL_RD_LOC 19
63 #define PCIE_PHY_STAT (PL_OFFSET + 0x110)
64 #define PCIE_PHY_STAT_DATA_LOC 0
65 #define PCIE_PHY_STAT_ACK_LOC 16
67 /* PHY registers (not memory-mapped) */
68 #define PCIE_PHY_RX_ASIC_OUT 0x100D
70 #define PHY_RX_OVRD_IN_LO 0x1005
71 #define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5)
72 #define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3)
74 #define PCIE_PHY_PUP_REQ (1 << 7)
77 #define PCIE_ATU_VIEWPORT 0x900
78 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
79 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
80 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
81 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
82 #define PCIE_ATU_CR1 0x904
83 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
84 #define PCIE_ATU_TYPE_IO (0x2 << 0)
85 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
86 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
87 #define PCIE_ATU_CR2 0x908
88 #define PCIE_ATU_ENABLE (0x1 << 31)
89 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
90 #define PCIE_ATU_LOWER_BASE 0x90C
91 #define PCIE_ATU_UPPER_BASE 0x910
92 #define PCIE_ATU_LIMIT 0x914
93 #define PCIE_ATU_LOWER_TARGET 0x918
94 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
95 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
96 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
97 #define PCIE_ATU_UPPER_TARGET 0x91C
99 struct imx_pcie_priv {
100 void __iomem *dbi_base;
101 void __iomem *cfg_base;
105 * PHY access functions
107 static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val)
110 u32 max_iterations = 10;
111 u32 wait_counter = 0;
114 val = readl(dbi_base + PCIE_PHY_STAT);
115 val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1;
122 } while (wait_counter < max_iterations);
127 static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr)
132 val = addr << PCIE_PHY_CTRL_DATA_LOC;
133 writel(val, dbi_base + PCIE_PHY_CTRL);
135 val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC);
136 writel(val, dbi_base + PCIE_PHY_CTRL);
138 ret = pcie_phy_poll_ack(dbi_base, 1);
142 val = addr << PCIE_PHY_CTRL_DATA_LOC;
143 writel(val, dbi_base + PCIE_PHY_CTRL);
145 ret = pcie_phy_poll_ack(dbi_base, 0);
152 /* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */
153 static int pcie_phy_read(void __iomem *dbi_base, int addr , int *data)
158 ret = pcie_phy_wait_ack(dbi_base, addr);
162 /* assert Read signal */
163 phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC;
164 writel(phy_ctl, dbi_base + PCIE_PHY_CTRL);
166 ret = pcie_phy_poll_ack(dbi_base, 1);
170 val = readl(dbi_base + PCIE_PHY_STAT);
171 *data = val & 0xffff;
173 /* deassert Read signal */
174 writel(0x00, dbi_base + PCIE_PHY_CTRL);
176 ret = pcie_phy_poll_ack(dbi_base, 0);
183 static int pcie_phy_write(void __iomem *dbi_base, int addr, int data)
190 ret = pcie_phy_wait_ack(dbi_base, addr);
194 var = data << PCIE_PHY_CTRL_DATA_LOC;
195 writel(var, dbi_base + PCIE_PHY_CTRL);
198 var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC);
199 writel(var, dbi_base + PCIE_PHY_CTRL);
201 ret = pcie_phy_poll_ack(dbi_base, 1);
205 /* deassert cap data */
206 var = data << PCIE_PHY_CTRL_DATA_LOC;
207 writel(var, dbi_base + PCIE_PHY_CTRL);
209 /* wait for ack de-assertion */
210 ret = pcie_phy_poll_ack(dbi_base, 0);
214 /* assert wr signal */
215 var = 0x1 << PCIE_PHY_CTRL_WR_LOC;
216 writel(var, dbi_base + PCIE_PHY_CTRL);
219 ret = pcie_phy_poll_ack(dbi_base, 1);
223 /* deassert wr signal */
224 var = data << PCIE_PHY_CTRL_DATA_LOC;
225 writel(var, dbi_base + PCIE_PHY_CTRL);
227 /* wait for ack de-assertion */
228 ret = pcie_phy_poll_ack(dbi_base, 0);
232 writel(0x0, dbi_base + PCIE_PHY_CTRL);
237 static int imx6_pcie_link_up(struct imx_pcie_priv *priv)
242 /* link is debug bit 36, debug register 1 starts at bit 32 */
243 rc = readl(priv->dbi_base + PCIE_PHY_DEBUG_R1);
244 if ((rc & PCIE_PHY_DEBUG_R1_LINK_UP) &&
245 !(rc & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING))
249 * From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
250 * Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2).
251 * If (MAC/LTSSM.state == Recovery.RcvrLock)
252 * && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
255 pcie_phy_read(priv->dbi_base, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
256 ltssm = readl(priv->dbi_base + PCIE_PHY_DEBUG_R0) & 0x3F;
264 printf("transition to gen2 is stuck, reset PHY!\n");
266 pcie_phy_read(priv->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
267 temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
268 pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
272 pcie_phy_read(priv->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
273 temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN);
274 pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
282 static int imx_pcie_regions_setup(struct imx_pcie_priv *priv)
285 * i.MX6 defines 16MB in the AXI address map for PCIe.
287 * That address space excepted the pcie registers is
288 * split and defined into different regions by iATU,
289 * with sizes and offsets as follows:
291 * 0x0100_0000 --- 0x010F_FFFF 1MB IORESOURCE_IO
292 * 0x0110_0000 --- 0x01EF_FFFF 14MB IORESOURCE_MEM
293 * 0x01F0_0000 --- 0x01FF_FFFF 1MB Cfg + Registers
296 /* CMD reg:I/O space, MEM space, and Bus Master Enable */
297 setbits_le32(priv->dbi_base + PCI_COMMAND,
298 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
300 /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
301 setbits_le32(priv->dbi_base + PCI_CLASS_REVISION,
302 PCI_CLASS_BRIDGE_PCI << 16);
304 /* Region #0 is used for Outbound CFG space access. */
305 writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
307 writel(lower_32_bits((uintptr_t)priv->cfg_base),
308 priv->dbi_base + PCIE_ATU_LOWER_BASE);
309 writel(upper_32_bits((uintptr_t)priv->cfg_base),
310 priv->dbi_base + PCIE_ATU_UPPER_BASE);
311 writel(lower_32_bits((uintptr_t)priv->cfg_base + MX6_ROOT_SIZE),
312 priv->dbi_base + PCIE_ATU_LIMIT);
314 writel(0, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
315 writel(0, priv->dbi_base + PCIE_ATU_UPPER_TARGET);
316 writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
317 writel(PCIE_ATU_ENABLE, priv->dbi_base + PCIE_ATU_CR2);
323 * PCI Express accessors
325 static void __iomem *get_bus_address(struct imx_pcie_priv *priv,
326 pci_dev_t d, int where)
328 void __iomem *va_address;
330 /* Reconfigure Region #0 */
331 writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
334 writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
336 writel(PCIE_ATU_TYPE_CFG1, priv->dbi_base + PCIE_ATU_CR1);
338 if (PCI_BUS(d) == 0) {
339 va_address = priv->dbi_base;
341 writel(d << 8, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
342 va_address = priv->cfg_base;
345 va_address += (where & ~0x3);
350 static int imx_pcie_addr_valid(pci_dev_t d)
352 if ((PCI_BUS(d) == 0) && (PCI_DEV(d) > 1))
354 if ((PCI_BUS(d) == 1) && (PCI_DEV(d) > 0))
360 * Replace the original ARM DABT handler with a simple jump-back one.
362 * The problem here is that if we have a PCIe bridge attached to this PCIe
363 * controller, but no PCIe device is connected to the bridges' downstream
364 * port, the attempt to read/write from/to the config space will produce
365 * a DABT. This is a behavior of the controller and can not be disabled
368 * To work around the problem, we backup the current DABT handler address
369 * and replace it with our own DABT handler, which only bounces right back
372 static void imx_pcie_fix_dabt_handler(bool set)
374 extern uint32_t *_data_abort;
375 uint32_t *data_abort_addr = (uint32_t *)&_data_abort;
377 static const uint32_t data_abort_bounce_handler = 0xe25ef004;
378 uint32_t data_abort_bounce_addr = (uint32_t)&data_abort_bounce_handler;
380 static uint32_t data_abort_backup;
383 data_abort_backup = *data_abort_addr;
384 *data_abort_addr = data_abort_bounce_addr;
386 *data_abort_addr = data_abort_backup;
390 static int imx_pcie_read_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
393 void __iomem *va_address;
396 ret = imx_pcie_addr_valid(d);
402 va_address = get_bus_address(priv, d, where);
405 * Read the PCIe config space. We must replace the DABT handler
406 * here in case we got data abort from the PCIe controller, see
407 * imx_pcie_fix_dabt_handler() description. Note that writing the
408 * "val" with valid value is also imperative here as in case we
409 * did got DABT, the val would contain random value.
411 imx_pcie_fix_dabt_handler(true);
412 writel(0xffffffff, val);
413 *val = readl(va_address);
414 imx_pcie_fix_dabt_handler(false);
419 static int imx_pcie_write_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
422 void __iomem *va_address = NULL;
425 ret = imx_pcie_addr_valid(d);
429 va_address = get_bus_address(priv, d, where);
432 * Write the PCIe config space. We must replace the DABT handler
433 * here in case we got data abort from the PCIe controller, see
434 * imx_pcie_fix_dabt_handler() description.
436 imx_pcie_fix_dabt_handler(true);
437 writel(val, va_address);
438 imx_pcie_fix_dabt_handler(false);
446 static int imx6_pcie_assert_core_reset(struct imx_pcie_priv *priv,
447 bool prepare_for_boot)
449 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
452 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_PCIE_SW_RST);
454 #if defined(CONFIG_MX6SX)
455 struct gpc *gpc_regs = (struct gpc *)GPC_BASE_ADDR;
457 /* SSP_EN is not used on MX6SX anymore */
458 setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_TEST_POWERDOWN);
459 /* Force PCIe PHY reset */
460 setbits_le32(&iomuxc_regs->gpr[5], IOMUXC_GPR5_PCIE_BTNRST);
461 /* Power up PCIe PHY */
462 setbits_le32(&gpc_regs->cntr, PCIE_PHY_PUP_REQ);
465 * If the bootloader already enabled the link we need some special
466 * handling to get the core back into a state where it is safe to
467 * touch it for configuration. As there is no dedicated reset signal
468 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
469 * state before completely disabling LTSSM, which is a prerequisite
470 * for core configuration.
472 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
473 * indication that the bootloader activated the link.
475 if (is_mx6dq() && prepare_for_boot) {
476 u32 val, gpr1, gpr12;
478 gpr1 = readl(&iomuxc_regs->gpr[1]);
479 gpr12 = readl(&iomuxc_regs->gpr[12]);
480 if ((gpr1 & IOMUXC_GPR1_PCIE_REF_CLK_EN) &&
481 (gpr12 & IOMUXC_GPR12_PCIE_CTL_2)) {
482 val = readl(priv->dbi_base + PCIE_PL_PFLR);
483 val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
484 val |= PCIE_PL_PFLR_FORCE_LINK;
486 imx_pcie_fix_dabt_handler(true);
487 writel(val, priv->dbi_base + PCIE_PL_PFLR);
488 imx_pcie_fix_dabt_handler(false);
490 gpr12 &= ~IOMUXC_GPR12_PCIE_CTL_2;
491 writel(val, &iomuxc_regs->gpr[12]);
494 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
495 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
501 static int imx6_pcie_init_phy(void)
503 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
505 clrbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE);
507 clrsetbits_le32(&iomuxc_regs->gpr[12],
508 IOMUXC_GPR12_DEVICE_TYPE_MASK,
509 IOMUXC_GPR12_DEVICE_TYPE_RC);
510 clrsetbits_le32(&iomuxc_regs->gpr[12],
511 IOMUXC_GPR12_LOS_LEVEL_MASK,
512 IOMUXC_GPR12_LOS_LEVEL_9);
515 clrsetbits_le32(&iomuxc_regs->gpr[12],
516 IOMUXC_GPR12_RX_EQ_MASK,
517 IOMUXC_GPR12_RX_EQ_2);
520 writel((0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN1_OFFSET) |
521 (0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_3P5DB_OFFSET) |
522 (20 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_6DB_OFFSET) |
523 (127 << IOMUXC_GPR8_PCS_TX_SWING_FULL_OFFSET) |
524 (127 << IOMUXC_GPR8_PCS_TX_SWING_LOW_OFFSET),
525 &iomuxc_regs->gpr[8]);
530 __weak int imx6_pcie_toggle_power(void)
532 #ifdef CONFIG_PCIE_IMX_POWER_GPIO
533 gpio_request(CONFIG_PCIE_IMX_POWER_GPIO, "pcie_power");
534 gpio_direction_output(CONFIG_PCIE_IMX_POWER_GPIO, 0);
536 gpio_set_value(CONFIG_PCIE_IMX_POWER_GPIO, 1);
538 gpio_free(CONFIG_PCIE_IMX_POWER_GPIO);
543 __weak int imx6_pcie_toggle_reset(void)
546 * See 'PCI EXPRESS BASE SPECIFICATION, REV 3.0, SECTION 6.6.1'
547 * for detailed understanding of the PCIe CR reset logic.
549 * The PCIe #PERST reset line _MUST_ be connected, otherwise your
550 * design does not conform to the specification. You must wait at
551 * least 20 ms after de-asserting the #PERST so the EP device can
552 * do self-initialisation.
554 * In case your #PERST pin is connected to a plain GPIO pin of the
555 * CPU, you can define CONFIG_PCIE_IMX_PERST_GPIO in your board's
556 * configuration file and the condition below will handle the rest
557 * of the reset toggling.
559 * In case your #PERST toggling logic is more complex, for example
560 * connected via CPLD or somesuch, you can override this function
561 * in your board file and implement reset logic as needed. You must
562 * not forget to wait at least 20 ms after de-asserting #PERST in
563 * this case either though.
565 * In case your #PERST line of the PCIe EP device is not connected
566 * at all, your design is broken and you should fix your design,
567 * otherwise you will observe problems like for example the link
568 * not coming up after rebooting the system back from running Linux
569 * that uses the PCIe as well OR the PCIe link might not come up in
570 * Linux at all in the first place since it's in some non-reset
571 * state due to being previously used in U-Boot.
573 #ifdef CONFIG_PCIE_IMX_PERST_GPIO
574 gpio_request(CONFIG_PCIE_IMX_PERST_GPIO, "pcie_reset");
575 gpio_direction_output(CONFIG_PCIE_IMX_PERST_GPIO, 0);
577 gpio_set_value(CONFIG_PCIE_IMX_PERST_GPIO, 1);
579 gpio_free(CONFIG_PCIE_IMX_PERST_GPIO);
581 puts("WARNING: Make sure the PCIe #PERST line is connected!\n");
586 static int imx6_pcie_deassert_core_reset(void)
588 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
590 imx6_pcie_toggle_power();
595 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_PCIE_SW_RST);
598 * Wait for the clock to settle a bit, when the clock are sourced
599 * from the CPU, we need about 30 ms to settle.
603 #if defined(CONFIG_MX6SX)
604 /* SSP_EN is not used on MX6SX anymore */
605 clrbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_TEST_POWERDOWN);
606 /* Clear PCIe PHY reset bit */
607 clrbits_le32(&iomuxc_regs->gpr[5], IOMUXC_GPR5_PCIE_BTNRST);
610 clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
611 setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
614 imx6_pcie_toggle_reset();
619 static int imx_pcie_link_up(struct imx_pcie_priv *priv)
621 struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
625 imx6_pcie_assert_core_reset(priv, false);
626 imx6_pcie_init_phy();
627 imx6_pcie_deassert_core_reset();
629 imx_pcie_regions_setup(priv);
632 * By default, the subordinate is set equally to the secondary
633 * bus (0x01) when the RC boots.
634 * This means that theoretically, only bus 1 is reachable from the RC.
635 * Force the PCIe RC subordinate to 0xff, otherwise no downstream
636 * devices will be detected if the enumeration is applied strictly.
638 tmp = readl(priv->dbi_base + 0x18);
640 writel(tmp, priv->dbi_base + 0x18);
643 * FIXME: Force the PCIe RC to Gen1 operation
644 * The RC must be forced into Gen1 mode before bringing the link
645 * up, otherwise no downstream devices are detected. After the
646 * link is up, a managed Gen1->Gen2 transition can be initiated.
648 tmp = readl(priv->dbi_base + 0x7c);
651 writel(tmp, priv->dbi_base + 0x7c);
653 /* LTSSM enable, starting link. */
654 setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE);
656 while (!imx6_pcie_link_up(priv)) {
660 #ifdef CONFIG_PCI_SCAN_SHOW
661 puts("PCI: pcie phy link never came up\n");
663 debug("DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
664 readl(priv->dbi_base + PCIE_PHY_DEBUG_R0),
665 readl(priv->dbi_base + PCIE_PHY_DEBUG_R1));
673 #if !CONFIG_IS_ENABLED(DM_PCI)
674 static struct imx_pcie_priv imx_pcie_priv = {
675 .dbi_base = (void __iomem *)MX6_DBI_ADDR,
676 .cfg_base = (void __iomem *)MX6_ROOT_ADDR,
679 static struct imx_pcie_priv *priv = &imx_pcie_priv;
681 static int imx_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
684 struct imx_pcie_priv *priv = hose->priv_data;
686 return imx_pcie_read_cfg(priv, d, where, val);
689 static int imx_pcie_write_config(struct pci_controller *hose, pci_dev_t d,
692 struct imx_pcie_priv *priv = hose->priv_data;
694 return imx_pcie_write_cfg(priv, d, where, val);
697 void imx_pcie_init(void)
699 /* Static instance of the controller. */
700 static struct pci_controller pcc;
701 struct pci_controller *hose = &pcc;
704 memset(&pcc, 0, sizeof(pcc));
706 hose->priv_data = priv;
709 pci_set_region(&hose->regions[0],
710 MX6_IO_ADDR, MX6_IO_ADDR,
711 MX6_IO_SIZE, PCI_REGION_IO);
713 /* PCI memory space */
714 pci_set_region(&hose->regions[1],
715 MX6_MEM_ADDR, MX6_MEM_ADDR,
716 MX6_MEM_SIZE, PCI_REGION_MEM);
718 /* System memory space */
719 pci_set_region(&hose->regions[2],
720 MMDC0_ARB_BASE_ADDR, MMDC0_ARB_BASE_ADDR,
721 0xefffffff, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
723 hose->region_count = 3;
726 pci_hose_read_config_byte_via_dword,
727 pci_hose_read_config_word_via_dword,
728 imx_pcie_read_config,
729 pci_hose_write_config_byte_via_dword,
730 pci_hose_write_config_word_via_dword,
731 imx_pcie_write_config);
733 /* Start the controller. */
734 ret = imx_pcie_link_up(priv);
737 pci_register_hose(hose);
738 hose->last_busno = pci_hose_scan(hose);
742 void imx_pcie_remove(void)
744 imx6_pcie_assert_core_reset(priv, true);
747 /* Probe function. */
748 void pci_init_board(void)
753 static int imx_pcie_dm_read_config(const struct udevice *dev, pci_dev_t bdf,
754 uint offset, ulong *value,
755 enum pci_size_t size)
757 struct imx_pcie_priv *priv = dev_get_priv(dev);
761 ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
765 *value = pci_conv_32_to_size(tmpval, offset, size);
769 static int imx_pcie_dm_write_config(struct udevice *dev, pci_dev_t bdf,
770 uint offset, ulong value,
771 enum pci_size_t size)
773 struct imx_pcie_priv *priv = dev_get_priv(dev);
777 ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
781 newval = pci_conv_size_to_32(tmpval, value, offset, size);
782 return imx_pcie_write_cfg(priv, bdf, offset, newval);
785 static int imx_pcie_dm_probe(struct udevice *dev)
787 struct imx_pcie_priv *priv = dev_get_priv(dev);
789 return imx_pcie_link_up(priv);
792 static int imx_pcie_dm_remove(struct udevice *dev)
794 struct imx_pcie_priv *priv = dev_get_priv(dev);
796 imx6_pcie_assert_core_reset(priv, true);
801 static int imx_pcie_ofdata_to_platdata(struct udevice *dev)
803 struct imx_pcie_priv *priv = dev_get_priv(dev);
805 priv->dbi_base = (void __iomem *)devfdt_get_addr_index(dev, 0);
806 priv->cfg_base = (void __iomem *)devfdt_get_addr_index(dev, 1);
807 if (!priv->dbi_base || !priv->cfg_base)
813 static const struct dm_pci_ops imx_pcie_ops = {
814 .read_config = imx_pcie_dm_read_config,
815 .write_config = imx_pcie_dm_write_config,
818 static const struct udevice_id imx_pcie_ids[] = {
819 { .compatible = "fsl,imx6q-pcie" },
820 { .compatible = "fsl,imx6sx-pcie" },
824 U_BOOT_DRIVER(imx_pcie) = {
827 .of_match = imx_pcie_ids,
828 .ops = &imx_pcie_ops,
829 .probe = imx_pcie_dm_probe,
830 .remove = imx_pcie_dm_remove,
831 .ofdata_to_platdata = imx_pcie_ofdata_to_platdata,
832 .priv_auto_alloc_size = sizeof(struct imx_pcie_priv),
833 .flags = DM_FLAG_OS_PREPARE,