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// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/mips-boards/piix4.h>
/* PCI interrupt pins */
#define PCIA 1
#define PCIB 2
#define PCIC 3
#define PCID 4
/* This table is filled in by interrogating the PIIX4 chip */
static char pci_irq[5] = {
};
static char irq_tab[][5] = {
/* INTA INTB INTC INTD */
{0, 0, 0, 0, 0 }, /* 0: GT64120 PCI bridge */
{0, 0, 0, 0, 0 }, /* 1: Unused */
{0, 0, 0, 0, 0 }, /* 2: Unused */
{0, 0, 0, 0, 0 }, /* 3: Unused */
{0, 0, 0, 0, 0 }, /* 4: Unused */
{0, 0, 0, 0, 0 }, /* 5: Unused */
{0, 0, 0, 0, 0 }, /* 6: Unused */
{0, 0, 0, 0, 0 }, /* 7: Unused */
{0, 0, 0, 0, 0 }, /* 8: Unused */
{0, 0, 0, 0, 0 }, /* 9: Unused */
{0, 0, 0, 0, PCID }, /* 10: PIIX4 USB */
{0, PCIB, 0, 0, 0 }, /* 11: AMD 79C973 Ethernet */
{0, PCIC, 0, 0, 0 }, /* 12: Crystal 4281 Sound */
{0, 0, 0, 0, 0 }, /* 13: Unused */
{0, 0, 0, 0, 0 }, /* 14: Unused */
{0, 0, 0, 0, 0 }, /* 15: Unused */
{0, 0, 0, 0, 0 }, /* 16: Unused */
{0, 0, 0, 0, 0 }, /* 17: Bonito/SOC-it PCI Bridge*/
{0, PCIA, PCIB, PCIC, PCID }, /* 18: PCI Slot 1 */
{0, PCIB, PCIC, PCID, PCIA }, /* 19: PCI Slot 2 */
{0, PCIC, PCID, PCIA, PCIB }, /* 20: PCI Slot 3 */
{0, PCID, PCIA, PCIB, PCIC } /* 21: PCI Slot 4 */
};
int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int virq;
virq = irq_tab[slot][pin];
return pci_irq[virq];
}
/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
return 0;
}
static void malta_piix_func3_base_fixup(struct pci_dev *dev)
{
/* Set a sane PM I/O base address */
pci_write_config_word(dev, PIIX4_FUNC3_PMBA, 0x1000);
/* Enable access to the PM I/O region */
pci_write_config_byte(dev, PIIX4_FUNC3_PMREGMISC,
PIIX4_FUNC3_PMREGMISC_EN);
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
malta_piix_func3_base_fixup);
static void malta_piix_func0_fixup(struct pci_dev *pdev)
{
unsigned char reg_val;
u32 reg_val32;
u16 reg_val16;
/* PIIX PIRQC[A:D] irq mappings */
static int piixirqmap[PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MAX] = {
0, 0, 0, 3,
4, 5, 6, 7,
0, 9, 10, 11,
12, 0, 14, 15
};
int i;
/* Interrogate PIIX4 to get PCI IRQ mapping */
for (i = 0; i <= 3; i++) {
pci_read_config_byte(pdev, PIIX4_FUNC0_PIRQRC+i, ®_val);
if (reg_val & PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_DISABLE)
pci_irq[PCIA+i] = 0; /* Disabled */
else
pci_irq[PCIA+i] = piixirqmap[reg_val &
PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MASK];
}
/* Done by YAMON 2.00 onwards */
if (PCI_SLOT(pdev->devfn) == 10) {
/*
* Set top of main memory accessible by ISA or DMA
* devices to 16 Mb.
*/
pci_read_config_byte(pdev, PIIX4_FUNC0_TOM, ®_val);
pci_write_config_byte(pdev, PIIX4_FUNC0_TOM, reg_val |
PIIX4_FUNC0_TOM_TOP_OF_MEMORY_MASK);
}
/* Mux SERIRQ to its pin */
pci_read_config_dword(pdev, PIIX4_FUNC0_GENCFG, ®_val32);
pci_write_config_dword(pdev, PIIX4_FUNC0_GENCFG,
reg_val32 | PIIX4_FUNC0_GENCFG_SERIRQ);
/* Enable SERIRQ */
pci_read_config_byte(pdev, PIIX4_FUNC0_SERIRQC, ®_val);
reg_val |= PIIX4_FUNC0_SERIRQC_EN | PIIX4_FUNC0_SERIRQC_CONT;
pci_write_config_byte(pdev, PIIX4_FUNC0_SERIRQC, reg_val);
/* Enable response to special cycles */
pci_read_config_word(pdev, PCI_COMMAND, ®_val16);
pci_write_config_word(pdev, PCI_COMMAND,
reg_val16 | PCI_COMMAND_SPECIAL);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
malta_piix_func0_fixup);
static void malta_piix_func1_fixup(struct pci_dev *pdev)
{
unsigned char reg_val;
/* Done by YAMON 2.02 onwards */
if (PCI_SLOT(pdev->devfn) == 10) {
/*
* IDE Decode enable.
*/
pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
®_val);
pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
reg_val|PIIX4_FUNC1_IDETIM_PRIMARY_HI_IDE_DECODE_EN);
pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
®_val);
pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
reg_val|PIIX4_FUNC1_IDETIM_SECONDARY_HI_IDE_DECODE_EN);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
malta_piix_func1_fixup);
/* Enable PCI 2.1 compatibility in PIIX4 */
static void quirk_dlcsetup(struct pci_dev *dev)
{
u8 odlc, ndlc;
(void) pci_read_config_byte(dev, PIIX4_FUNC0_DLC, &odlc);
/* Enable passive releases and delayed transaction */
ndlc = odlc | PIIX4_FUNC0_DLC_USBPR_EN |
PIIX4_FUNC0_DLC_PASSIVE_RELEASE_EN |
PIIX4_FUNC0_DLC_DELAYED_TRANSACTION_EN;
(void) pci_write_config_byte(dev, PIIX4_FUNC0_DLC, ndlc);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
quirk_dlcsetup);
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