diff options
| author | Simon Glass <sjg@chromium.org> | 2019-10-20 21:31:47 -0600 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2019-11-03 07:20:26 +0800 |
| commit | c53b318e1bad2e0d5c2b846fadfc79ec77bfc5f7 (patch) | |
| tree | 9fb3cf72abed73813d8a9885b59d4a66b7503b1b /drivers | |
| parent | e1500a6ce29a8424cc0c0a2fa82e694419941dd1 (diff) | |
spi: Add support for memory-mapped flash
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/sandbox_spi.c | 11 | ||||
| -rw-r--r-- | drivers/spi/spi-uclass.c | 14 |
2 files changed, 25 insertions, 0 deletions
diff --git a/drivers/spi/sandbox_spi.c b/drivers/spi/sandbox_spi.c index 16473ec7a0..6b610ff823 100644 --- a/drivers/spi/sandbox_spi.c +++ b/drivers/spi/sandbox_spi.c @@ -122,11 +122,22 @@ static int sandbox_cs_info(struct udevice *bus, uint cs, return 0; } +static int sandbox_spi_get_mmap(struct udevice *dev, ulong *map_basep, + uint *map_sizep, uint *offsetp) +{ + *map_basep = 0x1000; + *map_sizep = 0x2000; + *offsetp = 0x100; + + return 0; +} + static const struct dm_spi_ops sandbox_spi_ops = { .xfer = sandbox_spi_xfer, .set_speed = sandbox_spi_set_speed, .set_mode = sandbox_spi_set_mode, .cs_info = sandbox_cs_info, + .get_mmap = sandbox_spi_get_mmap, }; static const struct udevice_id sandbox_spi_ids[] = { diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c index 947516073e..665611f7e2 100644 --- a/drivers/spi/spi-uclass.c +++ b/drivers/spi/spi-uclass.c @@ -92,6 +92,20 @@ int dm_spi_xfer(struct udevice *dev, unsigned int bitlen, return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags); } +int dm_spi_get_mmap(struct udevice *dev, ulong *map_basep, uint *map_sizep, + uint *offsetp) +{ + struct udevice *bus = dev->parent; + struct dm_spi_ops *ops = spi_get_ops(bus); + + if (bus->uclass->uc_drv->id != UCLASS_SPI) + return -EOPNOTSUPP; + if (!ops->get_mmap) + return -ENOSYS; + + return ops->get_mmap(dev, map_basep, map_sizep, offsetp); +} + int spi_claim_bus(struct spi_slave *slave) { return log_ret(dm_spi_claim_bus(slave->dev)); |