diff options
Diffstat (limited to 'drivers/spi/spi-davinci.c')
| -rw-r--r-- | drivers/spi/spi-davinci.c | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index a29934422356..21a14e800eed 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -9,6 +9,7 @@ #include <linux/gpio/consumer.h> #include <linux/module.h> #include <linux/delay.h> +#include <linux/platform_data/edma.h> #include <linux/platform_device.h> #include <linux/err.h> #include <linux/clk.h> @@ -19,8 +20,6 @@ #include <linux/spi/spi_bitbang.h> #include <linux/slab.h> -#include <linux/platform_data/spi-davinci.h> - #define CS_DEFAULT 0xFF #define SPIFMT_PHASE_MASK BIT(16) @@ -98,8 +97,69 @@ #define SPIDEF 0x4c #define SPIFMT0 0x50 +#define SPI_IO_TYPE_POLL 1 +#define SPI_IO_TYPE_DMA 2 + #define DMA_MIN_BYTES 16 +enum { + SPI_VERSION_1, /* For DM355/DM365/DM6467 */ + SPI_VERSION_2, /* For DA8xx */ +}; + +/** + * struct davinci_spi_platform_data - Platform data for SPI master device on DaVinci + * + * @version: version of the SPI IP. Different DaVinci devices have slightly + * varying versions of the same IP. + * @num_chipselect: number of chipselects supported by this SPI master + * @intr_line: interrupt line used to connect the SPI IP to the ARM interrupt + * controller withn the SoC. Possible values are 0 and 1. + * @prescaler_limit: max clock prescaler value + * @cshold_bug: set this to true if the SPI controller on your chip requires + * a write to CSHOLD bit in between transfers (like in DM355). + * @dma_event_q: DMA event queue to use if SPI_IO_TYPE_DMA is used for any + * device on the bus. + */ +struct davinci_spi_platform_data { + u8 version; + u8 num_chipselect; + u8 intr_line; + u8 prescaler_limit; + bool cshold_bug; + enum dma_event_q dma_event_q; +}; + +/** + * struct davinci_spi_config - Per-chip-select configuration for SPI slave devices + * + * @wdelay: amount of delay between transmissions. Measured in number of + * SPI module clocks. + * @odd_parity: polarity of parity flag at the end of transmit data stream. + * 0 - odd parity, 1 - even parity. + * @parity_enable: enable transmission of parity at end of each transmit + * data stream. + * @io_type: type of IO transfer. Choose between polled, interrupt and DMA. + * @timer_disable: disable chip-select timers (setup and hold) + * @c2tdelay: chip-select setup time. Measured in number of SPI module clocks. + * @t2cdelay: chip-select hold time. Measured in number of SPI module clocks. + * @t2edelay: transmit data finished to SPI ENAn pin inactive time. Measured + * in number of SPI clocks. + * @c2edelay: chip-select active to SPI ENAn signal active time. Measured in + * number of SPI clocks. + */ +struct davinci_spi_config { + u8 wdelay; + u8 odd_parity; + u8 parity_enable; + u8 io_type; + u8 timer_disable; + u8 c2tdelay; + u8 t2cdelay; + u8 t2edelay; + u8 c2edelay; +}; + /* SPI Controller driver's private data. */ struct davinci_spi { struct spi_bitbang bitbang; |