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spi: dw: Move Non-DMA code to the DW PCIe-SPI driver

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This is a preparation patch before adding the DW DMA support into the
DW SPI MMIO driver. We need to unpin the Non-DMA-specific code from the
intended to be generic DW APB SSI DMA code. This isn't that hard,
since the most part of the spi-dw-mid.c driver in fact implements a
generic DMA interface for the DW SPI controller driver. The only Intel
MID specifics concern getting the max frequency from the MRST Clock
Control Unit and fetching the DMA controller channels from
corresponding PCIe DMA controller. Since first one is related with the
SPI interface configuration we moved it' implementation into the
DW PCIe-SPI driver module. After that former spi-dw-mid.c file
can be just renamed to be the DW SPI DMA module optionally compiled in to
the DW APB SSI core driver.

Co-developed-by: Georgy Vlasov <Georgy.Vlasov@baikalelectronics.ru>
Co-developed-by: Ramil Zaripov <Ramil.Zaripov@baikalelectronics.ru>
Signed-off-by: Georgy Vlasov <Georgy.Vlasov@baikalelectronics.ru>
Signed-off-by: Ramil Zaripov <Ramil.Zaripov@baikalelectronics.ru>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: devicetree@vger.kernel.org
Link: https://lore.kernel.org/r/20200529131205.31838-11-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Serge Semin
2020-05-29 16:11:59 +03:00
committed by Mark Brown
parent 77ccff803d
commit 6c710c0cb6
5 changed files with 73 additions and 69 deletions
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14
drivers/spi/spi-dw.h
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@@ -257,8 +257,16 @@ extern u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master,
struct spi_device *spi,
struct spi_transfer *transfer);
/* 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);
#ifdef CONFIG_SPI_DW_DMA
extern void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws);
extern void dw_spi_mid_setup_dma_generic(struct dw_spi *dws);
#else
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 /* !CONFIG_SPI_DW_DMA */
#endif /* DW_SPI_HEADER_H */