diff options
| author | Jarkko Nikula <jarkko.nikula@linux.intel.com> | 2020-05-06 17:30:25 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-05-06 19:11:36 +0200 |
| commit | 22d48ad7bfacda05900c3f7b43510fc4d40d5d53 (patch) | |
| tree | 3a8d734b7ae3c894bd42ed7f23e31a855e5d1459 | |
| parent | spi: dw: Propagate struct device pointer to ->dma_init() callback (diff) | |
| download | linux-22d48ad7bfacda05900c3f7b43510fc4d40d5d53.tar.xz linux-22d48ad7bfacda05900c3f7b43510fc4d40d5d53.zip | |
spi: dw: Add Elkhart Lake PSE DMA support
Elkhart Lake PSE SPI is capable to utilize PSE DMA engine which is described
in ACPI. With help of acpi-dma module the support becomes a generic one.
Thus, add Elkhart Lake PSE DMA support and generic DMA hooks in SPI DesignWare
driver.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200506153025.21441-8-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-dw-mid.c | 44 | ||||
| -rw-r--r-- | drivers/spi/spi-dw-pci.c | 1 | ||||
| -rw-r--r-- | drivers/spi/spi-dw.h | 1 |
3 files changed, 46 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index d73aa4ae644d..f3c85f92ef12 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -75,6 +75,24 @@ err_exit: return -EBUSY; } +static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) +{ + dws->rxchan = dma_request_slave_channel(dev, "rx"); + if (!dws->rxchan) + return -ENODEV; + dws->master->dma_rx = dws->rxchan; + + dws->txchan = dma_request_slave_channel(dev, "tx"); + if (!dws->txchan) { + dma_release_channel(dws->rxchan); + return -ENODEV; + } + dws->master->dma_tx = dws->txchan; + + dws->dma_inited = 1; + return 0; +} + static void mid_spi_dma_exit(struct dw_spi *dws) { if (!dws->dma_inited) @@ -291,8 +309,25 @@ static void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) dws->dma_rx = &mid_dma_rx; dws->dma_ops = &mfld_dma_ops; } + +static const struct dw_spi_dma_ops generic_dma_ops = { + .dma_init = mid_spi_dma_init_generic, + .dma_exit = mid_spi_dma_exit, + .dma_setup = mid_spi_dma_setup, + .can_dma = mid_spi_can_dma, + .dma_transfer = mid_spi_dma_transfer, + .dma_stop = mid_spi_dma_stop, +}; + +static void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) +{ + dws->dma_tx = &mid_dma_tx; + dws->dma_rx = &mid_dma_rx; + dws->dma_ops = &generic_dma_ops; +} #else /* CONFIG_SPI_DW_MID_DMA */ static inline void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) {} +static inline void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) {} #endif /* Some specific info for SPI0 controller on Intel MID */ @@ -329,3 +364,12 @@ int dw_spi_mid_init_mfld(struct dw_spi *dws) dw_spi_mid_setup_dma_mfld(dws); return 0; } + +int dw_spi_mid_init_generic(struct dw_spi *dws) +{ + /* Register hook to configure CTRLR0 */ + dws->update_cr0 = dw_spi_update_cr0; + + dw_spi_mid_setup_dma_generic(dws); + return 0; +} diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c index dd59df5122ee..dde54a918b5d 100644 --- a/drivers/spi/spi-dw-pci.c +++ b/drivers/spi/spi-dw-pci.c @@ -35,6 +35,7 @@ static struct spi_pci_desc spi_pci_mid_desc_2 = { }; static struct spi_pci_desc spi_pci_ehl_desc = { + .setup = dw_spi_mid_init_generic, .num_cs = 2, .bus_num = -1, .max_freq = 100000000, diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 642f0be642e5..490cff260a3e 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -261,5 +261,6 @@ extern u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master, /* platform related setup */ extern int dw_spi_mid_init_mfld(struct dw_spi *dws); +extern int dw_spi_mid_init_generic(struct dw_spi *dws); #endif /* DW_SPI_HEADER_H */ |