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Intel Lynx Point: LPC: Unify I/O APIC setup 

Remove local copies of reading and writing I/O APIC registers by
using already available functions.

This change is similar to

    commit db4f875a41
    Author: Kyösti Mälkki <kyosti.malkki@gmail.com>
    Date:   Tue Jan 31 17:24:12 2012 +0200

        IOAPIC: Divide setup_ioapic() in two parts.

        Reviewed-on: http://review.coreboot.org/300

and

    commit e614353194
    Author: Kyösti Mälkki <kyosti.malkki@gmail.com>
    Date:   Tue Feb 26 17:24:41 2013 +0200

        Unify setting 82801a/b/c/d IOAPIC ID

        Reviewed-on: http://review.coreboot.org/2532

and uses `io_apic_read()` and `io_apic_write()` too. Define
`ACPI_EN` in the header file `pch.h`.

As commented by Aaron Durbin, a separate `pch_enable_acpi()` is
not needed: “The existing code path *in this file* is about enabling
the io apic.” [1].

[1] http://review.coreboot.org/#/c/3182/4/src/southbridge/intel/lynxpoint/lpc.c

Change-Id: I6f2559f1d134590f781bd2cb325a9560512285dc
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3182
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
This commit is contained in:
Paul Menzel 2013-05-03 12:17:02 +02:00 committed by Alexandru Gagniuc
parent 9c50e6a4a0
commit 373a20c335
2 changed files with 18 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
src/southbridge/intel/lynxpoint/lpc.c
View File

@ -43,43 +43,29 @@
typedef struct southbridge_intel_lynxpoint_config config_t;
static void pch_enable_apic(struct device *dev)
/**
* Set miscellanous static southbridge features.
*
* @param dev PCI device with I/O APIC control registers
*/
static void pch_enable_ioapic(struct device *dev)
{
int i;
u32 reg32;
volatile u32 *ioapic_index = (volatile u32 *)(IO_APIC_ADDR);
volatile u32 *ioapic_data = (volatile u32 *)(IO_APIC_ADDR + 0x10);
/* Enable ACPI I/O and power management.
* Set SCI IRQ to IRQ9
*/
pci_write_config8(dev, ACPI_CNTL, 0x80);
/* Enable ACPI I/O range decode */
pci_write_config8(dev, ACPI_CNTL, ACPI_EN);
*ioapic_index = 0;
*ioapic_data = (2 << 24);
set_ioapic_id(IO_APIC_ADDR, 0x02);
/* affirm full set of redirection table entries ("write once") */
*ioapic_index = 1;
reg32 = *ioapic_data;
*ioapic_index = 1;
*ioapic_data = reg32;
reg32 = io_apic_read(IO_APIC_ADDR, 0x01);
io_apic_write(IO_APIC_ADDR, 0x01, reg32);
*ioapic_index = 0;
reg32 = *ioapic_data;
printk(BIOS_DEBUG, "Southbridge APIC ID = %x\n", (reg32 >> 24) & 0x0f);
if (reg32 != (1 << 25))
die("APIC Error\n");
printk(BIOS_SPEW, "Dumping IOAPIC registers\n");
for (i=0; i<3; i++) {
*ioapic_index = i;
printk(BIOS_SPEW, " reg 0x%04x:", i);
reg32 = *ioapic_data;
printk(BIOS_SPEW, " 0x%08x\n", reg32);
}
*ioapic_index = 3; /* Select Boot Configuration register. */
*ioapic_data = 1; /* Use Processor System Bus to deliver interrupts. */
/*
* Select Boot Configuration register (0x03) and
* use Processor System Bus (0x01) to deliver interrupts.
*/
io_apic_write(IO_APIC_ADDR, 0x03, 0x01);
}
static void pch_enable_serial_irqs(struct device *dev)
@ -547,7 +533,7 @@ static void lpc_init(struct device *dev)
pci_write_config16(dev, PCI_COMMAND, 0x000f);
/* IO APIC initialization. */
pch_enable_apic(dev);
pch_enable_ioapic(dev);
pch_enable_serial_irqs(dev);

1
src/southbridge/intel/lynxpoint/pch.h
View File

@ -236,6 +236,7 @@ unsigned get_gpios(const int *gpio_num_array);
#define PMBASE 0x40
#define ACPI_CNTL 0x44
#define ACPI_EN (1 << 7)
#define BIOS_CNTL 0xDC
#define GPIO_BASE 0x48 /* LPC GPIO Base Address Register */
#define GPIO_CNTL 0x4C /* LPC GPIO Control Register */