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soc/intel/common/lpss: Add lpss_is_controller_in_reset 

Add new API function lpss_is_controller_in_reset that returns whether
the LPSS controller is in reset. Also, add lpss.c to smm stage so that
lpss_is_controller_in_reset can be used in smihandler.

BUG=b:64030366

Change-Id: I0fe5c2890ee799b08482e487296a483fa8d42461
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/20885
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Furquan Shaikh 2017-08-04 16:04:46 -07:00 committed by Furquan Shaikh
parent 3406dd64c3
commit 3b90b5f129
3 changed files with 15 additions and 0 deletions
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3
src/soc/intel/common/block/include/intelblocks/lpss.h
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@ -27,4 +27,7 @@ void lpss_reset_release(uintptr_t base);
*/
void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val);
/* Check if controller is in reset. */
bool lpss_is_controller_in_reset(uintptr_t base);
#endif /* SOC_INTEL_COMMON_BLOCK_LPSS_H */

1
src/soc/intel/common/block/lpss/Makefile.inc
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@ -2,3 +2,4 @@ bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
verstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c
smm-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPSS) += lpss.c

11
src/soc/intel/common/block/lpss/lpss.c
View File

@ -39,6 +39,17 @@
/* DMA Software Reset Control */
#define LPSS_DMA_RST_RELEASE (1 << 2)
bool lpss_is_controller_in_reset(uintptr_t base)
{
uint8_t *addr = (void *)base;
uint32_t val = read32(addr + LPSS_RESET_CTL_REG);
if (val == 0xFFFFFFFF)
return true;
return !(val & LPSS_CNT_RST_RELEASE);
}
void lpss_reset_release(uintptr_t base)
{
uint8_t *addr = (void *)base;