amd/stoneyridge: Convert BiosRam access to MMIO
Change the BiosRam read/write functions to use the fixed MMIO range at 0xfed80500. This is faster than two accesses per byte when using I/O 0xcd4/0xcd5. Note that BiosRam may only be accessed byte-by-byte. It does not decode normally. Change-Id: I9d8baf2bd5d9d48a87bddfb6a0b86e292a8fdf7d Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/23436 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
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@ -36,6 +36,7 @@
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#define AMD_SB_ACPI_MMIO_ADDR 0xfed80000
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#define AMD_SB_ACPI_MMIO_ADDR 0xfed80000
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#define APU_SMI_BASE 0xfed80200
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#define APU_SMI_BASE 0xfed80200
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#define PM_MMIO_BASE 0xfed80300
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#define PM_MMIO_BASE 0xfed80300
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#define BIOSRAM_MMIO_BASE 0xfed80500
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#define XHCI_ACPI_PM_MMIO_BASE 0xfed81c00
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#define XHCI_ACPI_PM_MMIO_BASE 0xfed81c00
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#define APU_UART0_BASE 0xfedc6000
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#define APU_UART0_BASE 0xfedc6000
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#define APU_UART1_BASE 0xfedc8000
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#define APU_UART1_BASE 0xfedc8000
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@ -78,16 +78,15 @@ void smi_write8(uint8_t offset, uint8_t value)
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uint8_t biosram_read8(uint8_t offset)
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uint8_t biosram_read8(uint8_t offset)
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{
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{
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outb(offset, BIOSRAM_INDEX);
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return read8((void *)(BIOSRAM_MMIO_BASE + offset));
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return inb(BIOSRAM_DATA);
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}
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}
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void biosram_write8(uint8_t offset, uint8_t value)
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void biosram_write8(uint8_t offset, uint8_t value)
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{
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{
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outb(offset, BIOSRAM_INDEX);
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write8((void *)(BIOSRAM_MMIO_BASE + offset), value);
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outb(value, BIOSRAM_DATA);
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}
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}
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/* BiosRam may only be accessed a byte at a time */
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uint16_t biosram_read16(uint8_t offset)
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uint16_t biosram_read16(uint8_t offset)
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{
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{
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int i;
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int i;
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