arch/x86/cpu/queensbay/irq.c

   1 /*
   2  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
   3  * Copyright (C) 2015 Google, Inc
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <asm/io.h>
  11 #include <asm/irq.h>
  12 #include <asm/pci.h>
  13 #include <asm/arch/device.h>
  14 #include <asm/arch/tnc.h>
  15
  16 int queensbay_irq_router_probe(struct udevice *dev)
  17 {
  18         struct tnc_rcba *rcba;
  19         u32 base;
  20
  21         base = x86_pci_read_config32(TNC_LPC, LPC_RCBA);
  22         base &= ~MEM_BAR_EN;
  23         rcba = (struct tnc_rcba *)base;
  24
  25         /* Make sure all internal PCI devices are using INTA */
  26         writel(INTA, &rcba->d02ip);
  27         writel(INTA, &rcba->d03ip);
  28         writel(INTA, &rcba->d27ip);
  29         writel(INTA, &rcba->d31ip);
  30         writel(INTA, &rcba->d23ip);
  31         writel(INTA, &rcba->d24ip);
  32         writel(INTA, &rcba->d25ip);
  33         writel(INTA, &rcba->d26ip);
  34
  35         /*
  36          * Route TunnelCreek PCI device interrupt pin to PIRQ
  37          *
  38          * Since PCIe downstream ports received INTx are routed to PIRQ
  39          * A/B/C/D directly and not configurable, we have to route PCIe
  40          * root ports' INTx to PIRQ A/B/C/D as well. For other devices
  41          * on TunneCreek, route them to PIRQ E/F/G/H.
  42          */
  43         writew(PIRQE, &rcba->d02ir);
  44         writew(PIRQF, &rcba->d03ir);
  45         writew(PIRQG, &rcba->d27ir);
  46         writew(PIRQH, &rcba->d31ir);
  47         writew(PIRQA, &rcba->d23ir);
  48         writew(PIRQB, &rcba->d24ir);
  49         writew(PIRQC, &rcba->d25ir);
  50         writew(PIRQD, &rcba->d26ir);
  51
  52         return irq_router_common_init(dev);
  53 }
  54
  55 static const struct udevice_id queensbay_irq_router_ids[] = {
  56         { .compatible = "intel,queensbay-irq-router" },
  57         { }
  58 };
  59
  60 U_BOOT_DRIVER(queensbay_irq_router_drv) = {
  61         .name           = "queensbay_intel_irq",
  62         .id             = UCLASS_IRQ,
  63         .of_match       = queensbay_irq_router_ids,
  64         .probe          = queensbay_irq_router_probe,
  65 };