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drivers/spi: Re-factor spi_crop_chunk

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spi_crop_chunk is a property of the SPI controller since it depends
upon the maximum transfer size that is supported by the
controller. Also, it is possible to implement this within spi-generic
layer by obtaining following parameters from the controller:

1. max_xfer_size: Maximum transfer size supported by the controller
(Size of 0 indicates invalid size, and unlimited transfer size is
indicated by UINT32_MAX.)

2. deduct_cmd_len: Whether cmd_len needs to be deducted from the
max_xfer_size to determine max data size that can be
transferred. (This is used by the amd boards.)

Change-Id: I81c199413f879c664682088e93bfa3f91c6a46e5
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19386
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Tested-by: coreboot org <coreboot.org@gmail.com>
This commit is contained in:
Furquan Shaikh
2017-04-19 19:27:28 -07:00
committed by Martin Roth
parent f1db5fdb4d
commit de705fa1f4
37 changed files with 92 additions and 119 deletions
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7
src/southbridge/amd/agesa/hudson/spi.c
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@@ -85,11 +85,6 @@ void spi_init(void)
spibar = pci_read_config32(dev, 0xA0) & ~0x1F;
}
unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
{
return min(AMD_SB_SPI_TX_LEN - cmd_len, buf_len);
}
static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout,
size_t bytesout, void *din, size_t bytesin)
{
@@ -168,6 +163,8 @@ int chipset_volatile_group_end(const struct spi_flash *flash)
static const struct spi_ctrlr spi_ctrlr = {
.xfer = spi_ctrlr_xfer,
.xfer_vector = spi_xfer_two_vectors,
.max_xfer_size = AMD_SB_SPI_TX_LEN,
.deduct_cmd_len = true,
};
int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)