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spi: Add support for memory-mapped flash

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On x86 platforms the SPI flash can be mapped into memory so that the
contents can be read with normal memory accesses.

Add a new SPI method to find the location of the SPI flash in memory. This
differs from the existing device-tree "memory-map" mechanism in that the
location can be discovered at run-time.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2019-10-20 21:31:47 -06:00
committed by Bin Meng
parent e1500a6ce2
commit c53b318e1b
4 changed files with 61 additions and 0 deletions
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9
test/dm/sf.c
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@@ -23,6 +23,9 @@ static int dm_test_spi_flash(struct unit_test_state *uts)
int full_size = 0x200000;
int size = 0x10000;
u8 *src, *dst;
uint map_size;
ulong map_base;
uint offset;
int i;
src = map_sysmem(0x20000, full_size);
@@ -54,6 +57,12 @@ static int dm_test_spi_flash(struct unit_test_state *uts)
sandbox_sf_set_block_protect(emul, 0);
ut_asserteq(0, spl_flash_get_sw_write_prot(dev));
/* Check mapping */
ut_assertok(dm_spi_get_mmap(dev, &map_base, &map_size, &offset));
ut_asserteq(0x1000, map_base);
ut_asserteq(0x2000, map_size);
ut_asserteq(0x100, offset);
/*
* Since we are about to destroy all devices, we must tell sandbox
* to forget the emulation device