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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <pci.h>
#include <qemu_fw_cfg.h>
#include <asm/irq.h>
#include <asm/post.h>
#include <asm/processor.h>
#include <asm/arch/device.h>
#include <asm/arch/qemu.h>
static bool i440fx;
#ifdef CONFIG_QFW
/* on x86, the qfw registers are all IO ports */
#define FW_CONTROL_PORT 0x510
#define FW_DATA_PORT 0x511
#define FW_DMA_PORT_LOW 0x514
#define FW_DMA_PORT_HIGH 0x518
static void qemu_x86_fwcfg_read_entry_pio(uint16_t entry,
uint32_t size, void *address)
{
uint32_t i = 0;
uint8_t *data = address;
/*
* writting FW_CFG_INVALID will cause read operation to resume at
* last offset, otherwise read will start at offset 0
*
* Note: on platform where the control register is IO port, the
* endianness is little endian.
*/
if (entry != FW_CFG_INVALID)
outw(cpu_to_le16(entry), FW_CONTROL_PORT);
/* the endianness of data register is string-preserving */
while (size--)
data[i++] = inb(FW_DATA_PORT);
}
static void qemu_x86_fwcfg_read_entry_dma(struct fw_cfg_dma_access *dma)
{
/* the DMA address register is big endian */
outl(cpu_to_be32((uint32_t)dma), FW_DMA_PORT_HIGH);
while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR)
__asm__ __volatile__ ("pause");
}
static struct fw_cfg_arch_ops fwcfg_x86_ops = {
.arch_read_pio = qemu_x86_fwcfg_read_entry_pio,
.arch_read_dma = qemu_x86_fwcfg_read_entry_dma
};
#endif
static void enable_pm_piix(void)
{
u8 en;
u16 cmd;
/* Set the PM I/O base */
pci_write_config32(PIIX_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
/* Enable access to the PM I/O space */
pci_read_config16(PIIX_PM, PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_IO;
pci_write_config16(PIIX_PM, PCI_COMMAND, cmd);
/* PM I/O Space Enable (PMIOSE) */
pci_read_config8(PIIX_PM, PMREGMISC, &en);
en |= PMIOSE;
pci_write_config8(PIIX_PM, PMREGMISC, en);
}
static void enable_pm_ich9(void)
{
/* Set the PM I/O base */
pci_write_config32(ICH9_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
}
static void qemu_chipset_init(void)
{
u16 device, xbcs;
int pam, i;
/*
* i440FX and Q35 chipset have different PAM register offset, but with
* the same bitfield layout. Here we determine the offset based on its
* PCI device ID.
*/
pci_read_config16(PCI_BDF(0, 0, 0), PCI_DEVICE_ID, &device);
i440fx = (device == PCI_DEVICE_ID_INTEL_82441);
pam = i440fx ? I440FX_PAM : Q35_PAM;
/*
* Initialize Programmable Attribute Map (PAM) Registers
*
* Configure legacy segments C/D/E/F to system RAM
*/
for (i = 0; i < PAM_NUM; i++)
pci_write_config8(PCI_BDF(0, 0, 0), pam + i, PAM_RW);
if (i440fx) {
/*
* Enable legacy IDE I/O ports decode
*
* Note: QEMU always decode legacy IDE I/O port on PIIX chipset.
* However Linux ata_piix driver does sanity check on these two
* registers to see whether legacy ports decode is turned on.
* This is to make Linux ata_piix driver happy.
*/
pci_write_config16(PIIX_IDE, IDE0_TIM, IDE_DECODE_EN);
pci_write_config16(PIIX_IDE, IDE1_TIM, IDE_DECODE_EN);
/* Enable I/O APIC */
pci_read_config16(PIIX_ISA, XBCS, &xbcs);
xbcs |= APIC_EN;
pci_write_config16(PIIX_ISA, XBCS, xbcs);
enable_pm_piix();
} else {
/* Configure PCIe ECAM base address */
pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR,
CONFIG_PCIE_ECAM_BASE | BAR_EN);
enable_pm_ich9();
}
#ifdef CONFIG_QFW
qemu_fwcfg_init(&fwcfg_x86_ops);
#endif
}
int arch_cpu_init(void)
{
int ret;
post_code(POST_CPU_INIT);
ret = x86_cpu_init_f();
if (ret)
return ret;
return 0;
}
#ifndef CONFIG_EFI_STUB
int print_cpuinfo(void)
{
post_code(POST_CPU_INFO);
return default_print_cpuinfo();
}
#endif
void reset_cpu(ulong addr)
{
/* cold reset */
x86_full_reset();
}
int arch_early_init_r(void)
{
qemu_chipset_init();
return 0;
}
#ifdef CONFIG_GENERATE_MP_TABLE
int mp_determine_pci_dstirq(int bus, int dev, int func, int pirq)
{
u8 irq;
if (i440fx) {
/*
* Not like most x86 platforms, the PIRQ[A-D] on PIIX3 are not
* connected to I/O APIC INTPIN#16-19. Instead they are routed
* to an irq number controled by the PIRQ routing register.
*/
pci_read_config8(PCI_BDF(bus, dev, func),
PCI_INTERRUPT_LINE, &irq);
} else {
/*
* ICH9's PIRQ[A-H] are not consecutive numbers from 0 to 7.
* PIRQ[A-D] still maps to [0-3] but PIRQ[E-H] maps to [8-11].
*/
irq = pirq < 8 ? pirq + 16 : pirq + 12;
}
return irq;
}
#endif
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