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authorWeike Chen <alvin.chen@intel.com>2014-11-26 02:35:10 -0800
committerMark Brown <broonie@kernel.org>2014-11-26 18:07:45 +0000
commite5262d0568dc9e10de79a726dfd7edb712a2c10b (patch)
treefb8cd4ca58e8f0ef1b1a016ac88139401ed55cfe /drivers/spi/spi-pxa2xx.h
parent4fdb2424cc4499237197a8c9d35b34d68c750475 (diff)
downloadlinux-e5262d0568dc9e10de79a726dfd7edb712a2c10b.tar.bz2
spi: spi-pxa2xx: SPI support for Intel Quark X1000
There are two SPI controllers exported by PCI subsystem for Intel Quark X1000. The SPI memory mapped I/O registers supported by Quark are different from the current implementation, and Quark only supports the registers of 'SSCR0', 'SSCR1', 'SSSR', 'SSDR', and 'DDS_RATE'. This patch is to enable the SPI for Intel Quark X1000. This piece of work is derived from Dan O'Donovan's initial work for Intel Quark X1000 SPI enabling. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Weike Chen <alvin.chen@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-pxa2xx.h')
-rw-r--r--drivers/spi/spi-pxa2xx.h16
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 5adc2a11c7bc..6bec59c90cd4 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -93,6 +93,7 @@ struct driver_data {
struct chip_data {
u32 cr0;
u32 cr1;
+ u32 dds_rate;
u32 psp;
u32 timeout;
u8 n_bytes;
@@ -126,6 +127,7 @@ DEFINE_SSP_REG(SSCR1, 0x04)
DEFINE_SSP_REG(SSSR, 0x08)
DEFINE_SSP_REG(SSITR, 0x0c)
DEFINE_SSP_REG(SSDR, 0x10)
+DEFINE_SSP_REG(DDS_RATE, 0x28) /* DDS Clock Rate */
DEFINE_SSP_REG(SSTO, 0x28)
DEFINE_SSP_REG(SSPSP, 0x2c)
DEFINE_SSP_REG(SSITF, SSITF)
@@ -141,18 +143,22 @@ DEFINE_SSP_REG(SSIRF, SSIRF)
static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
{
- if (drv_data->ssp_type == PXA25x_SSP)
+ switch (drv_data->ssp_type) {
+ case PXA25x_SSP:
+ case CE4100_SSP:
+ case QUARK_X1000_SSP:
return 1;
- if (drv_data->ssp_type == CE4100_SSP)
- return 1;
- return 0;
+ default:
+ return 0;
+ }
}
static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
{
void __iomem *reg = drv_data->ioaddr;
- if (drv_data->ssp_type == CE4100_SSP)
+ if (drv_data->ssp_type == CE4100_SSP ||
+ drv_data->ssp_type == QUARK_X1000_SSP)
val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
write_SSSR(val, reg);