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spi: pxa2xx: Add support for Intel Cannonlake 

Intel Cannonlake LPSS SPI has up to four chip selects per port like in
Broxton and is clocked like Sunrisepoint and Kaby Lake. Add a new type
LPSS_CNL_SSP and configuration that enable runtime chip select detection
and use the same FIFO thresholds than in Sunrisepoint.

Patch adds support for both Cannonlake SoC and PCH.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Jarkko Nikula 2017-05-30 17:31:21 +03:00 committed by Mark Brown
parent 2ea659a9ef
commit fc0b2acc75
2 changed files with 23 additions and 0 deletions
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22
drivers/spi/spi-pxa2xx.c
View File

@ -151,6 +151,18 @@ static const struct lpss_config lpss_platforms[] = {
.cs_sel_shift = 8,
.cs_sel_mask = 3 << 8,
},
{ /* LPSS_CNL_SSP */
.offset = 0x200,
.reg_general = -1,
.reg_ssp = 0x20,
.reg_cs_ctrl = 0x24,
.reg_capabilities = 0xfc,
.rx_threshold = 1,
.tx_threshold_lo = 32,
.tx_threshold_hi = 56,
.cs_sel_shift = 8,
.cs_sel_mask = 3 << 8,
},
};
static inline const struct lpss_config
@ -167,6 +179,7 @@ static bool is_lpss_ssp(const struct driver_data *drv_data)
case LPSS_BSW_SSP:
case LPSS_SPT_SSP:
case LPSS_BXT_SSP:
case LPSS_CNL_SSP:
return true;
default:
return false;
@ -1275,6 +1288,7 @@ static int setup(struct spi_device *spi)
case LPSS_BSW_SSP:
case LPSS_SPT_SSP:
case LPSS_BXT_SSP:
case LPSS_CNL_SSP:
config = lpss_get_config(drv_data);
tx_thres = config->tx_threshold_lo;
tx_hi_thres = config->tx_threshold_hi;
@ -1470,6 +1484,14 @@ static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = {
{ PCI_VDEVICE(INTEL, 0x5ac2), LPSS_BXT_SSP },
{ PCI_VDEVICE(INTEL, 0x5ac4), LPSS_BXT_SSP },
{ PCI_VDEVICE(INTEL, 0x5ac6), LPSS_BXT_SSP },
/* CNL-LP */
{ PCI_VDEVICE(INTEL, 0x9daa), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0x9dab), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0x9dfb), LPSS_CNL_SSP },
/* CNL-H */
{ PCI_VDEVICE(INTEL, 0xa32a), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0xa32b), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0xa37b), LPSS_CNL_SSP },
{ },
};

1
include/linux/pxa2xx_ssp.h
View File

@ -196,6 +196,7 @@ enum pxa_ssp_type {
LPSS_BSW_SSP,
LPSS_SPT_SSP,
LPSS_BXT_SSP,
LPSS_CNL_SSP,
};
struct ssp_device {