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spi/pl022: add support for the PL023 derivate

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This adds support for a further ST variant of the PL022 called
PL023. Some differences in the control registers due to being
stripped down to SPI mode only, and a new clock feedback sample
delay config setting is available.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Linus Walleij 2010-05-07 08:40:53 +00:00 • committed by Grant Likely
parent 556f4aeb7d
commit 781c7b129b
2 changed files with 104 additions and 18 deletions
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32
include/linux/amba/pl022.h
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@ -182,8 +182,8 @@ enum ssp_microwire_wait_state {
};
/**
* enum Microwire - whether Full/Half Duplex, only available
* in the ST Micro variant.
* enum ssp_duplex - whether Full/Half Duplex on microwire, only
* available in the ST Micro variant.
* @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional,
* SSPRXD not used
* @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is
@ -194,6 +194,31 @@ enum ssp_duplex {
SSP_MICROWIRE_CHANNEL_HALF_DUPLEX
};
/**
* enum ssp_clkdelay - an optional clock delay on the feedback clock
* only available in the ST Micro PL023 variant.
* @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the
* slave is sampled directly
* @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with
* a delay of T-dt
* @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt
* @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt
* @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt
* @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt
* @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt
* @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt
*/
enum ssp_clkdelay {
SSP_FEEDBACK_CLK_DELAY_NONE,
SSP_FEEDBACK_CLK_DELAY_1T,
SSP_FEEDBACK_CLK_DELAY_2T,
SSP_FEEDBACK_CLK_DELAY_3T,
SSP_FEEDBACK_CLK_DELAY_4T,
SSP_FEEDBACK_CLK_DELAY_5T,
SSP_FEEDBACK_CLK_DELAY_6T,
SSP_FEEDBACK_CLK_DELAY_7T
};
/**
* CHIP select/deselect commands
*/
@ -237,6 +262,8 @@ struct pl022_ssp_controller {
* @ctrl_len: Microwire interface: Control length
* @wait_state: Microwire interface: Wait state
* @duplex: Microwire interface: Full/Half duplex
* @clkdelay: on the PL023 variant, the delay in feeback clock cycles
* before sampling the incoming line
* @cs_control: function pointer to board-specific function to
* assert/deassert I/O port to control HW generation of devices chip-select.
* @dma_xfer_type: Type of DMA xfer (Mem-to-periph or Periph-to-Periph)
@ -260,6 +287,7 @@ struct pl022_config_chip {
enum ssp_microwire_ctrl_len ctrl_len;
enum ssp_microwire_wait_state wait_state;
enum ssp_duplex duplex;
enum ssp_clkdelay clkdelay;
void (*cs_control) (u32 control);
};