x86: spi: Add a way to access the SPI mapping via registers
At present the PCI BDF (bus/device/function) is needed to access the SPI
mapping, since the registers are at BAR0. This doesn't work when PCI
auto-config has not been done yet, since BARs are unassigned.
Add another way to find the mapping, using the MMIO base, if the caller
knows this.
Also add a missing function comment.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/include/asm/fast_spi.h b/arch/x86/include/asm/fast_spi.h
index 47c1da8..7a81d4f 100644
--- a/arch/x86/include/asm/fast_spi.h
+++ b/arch/x86/include/asm/fast_spi.h
@@ -64,6 +64,25 @@
int fast_spi_get_bios_mmap(pci_dev_t pdev, ulong *map_basep, uint *map_sizep,
uint *offsetp);
+/**
+ * fast_spi_get_bios_mmap_regs() - Get memory map for SPI flash given regs
+ *
+ * @regs: SPI registers to use
+ * @map_basep: Returns base memory address for mapped SPI
+ * @map_sizep: Returns size of mapped SPI
+ * @offsetp: Returns start offset of SPI flash where the map works
+ * correctly (offsets before this are not visible)
+ * @return 0 (always)
+ */
+int fast_spi_get_bios_mmap_regs(struct fast_spi_regs *regs, ulong *map_basep,
+ uint *map_sizep, uint *offsetp);
+
+/**
+ * fast_spi_early_init() - Set up a BAR to use SPI early in U-Boot
+ *
+ * @pdev: PCI device to use (this is the Fast SPI device)
+ * @mmio_base: MMIO base to use to access registers
+ */
int fast_spi_early_init(pci_dev_t pdev, ulong mmio_base);
#endif /* ASM_FAST_SPI_H */