src/cpu/power9: add file structure for power9, implement SCOM access

Change-Id: Ib555ce51294c94b22d9a7c0db84d38d7928f7015
Signed-off-by: Igor Bagnucki <igor.bagnucki@3mdeb.com>
Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57078
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/src/include/cpu/power/spr.h b/src/include/cpu/power/spr.h
new file mode 100644
index 0000000000..f22a6cab3d
--- /dev/null
+++ b/src/include/cpu/power/spr.h
@@ -0,0 +1,70 @@
+#ifndef CPU_PPC64_SPR_H
+#define CPU_PPC64_SPR_H
+
+#include <arch/byteorder.h>	// PPC_BIT()
+
+#define SPR_TB					0x10C
+
+#define SPR_PVR					0x11F
+#define SPR_PVR_REV_MASK			(PPC_BITMASK(52, 55) | PPC_BITMASK(60, 63))
+#define SPR_PVR_REV(maj, min)			(PPC_SHIFT((maj), 55) | PPC_SHIFT((min), 63))
+
+#define SPR_HRMOR				0x139
+
+#define SPR_HMER				0x150
+/* Bits in HMER/HMEER */
+#define SPR_HMER_MALFUNCTION_ALERT		PPC_BIT(0)
+#define SPR_HMER_PROC_RECV_DONE			PPC_BIT(2)
+#define SPR_HMER_PROC_RECV_ERROR_MASKED		PPC_BIT(3)
+#define SPR_HMER_TFAC_ERROR			PPC_BIT(4)
+#define SPR_HMER_TFMR_PARITY_ERROR		PPC_BIT(5)
+#define SPR_HMER_XSCOM_FAIL			PPC_BIT(8)
+#define SPR_HMER_XSCOM_DONE			PPC_BIT(9)
+#define SPR_HMER_PROC_RECV_AGAIN		PPC_BIT(11)
+#define SPR_HMER_WARN_RISE			PPC_BIT(14)
+#define SPR_HMER_WARN_FALL			PPC_BIT(15)
+#define SPR_HMER_SCOM_FIR_HMI			PPC_BIT(16)
+#define SPR_HMER_TRIG_FIR_HMI			PPC_BIT(17)
+#define SPR_HMER_HYP_RESOURCE_ERR		PPC_BIT(20)
+#define SPR_HMER_XSCOM_STATUS			PPC_BITMASK(21, 23)
+#define SPR_HMER_XSCOM_OCCUPIED			PPC_BIT(23)
+
+#ifndef __ASSEMBLER__
+#include <types.h>
+
+static inline uint64_t read_spr(int spr)
+{
+	uint64_t val;
+	asm volatile("mfspr %0,%1" : "=r"(val) : "i"(spr) : "memory");
+	return val;
+}
+
+static inline void write_spr(int spr, uint64_t val)
+{
+	asm volatile("mtspr %0, %1" :: "i"(spr), "r"(val) : "memory");
+}
+
+static inline uint64_t read_hmer(void)
+{
+	return read_spr(SPR_HMER);
+}
+
+static inline void clear_hmer(void)
+{
+	write_spr(SPR_HMER, 0);
+}
+
+static inline uint64_t read_msr(void)
+{
+	uint64_t val;
+	asm volatile("mfmsr %0" : "=r"(val) :: "memory");
+	return val;
+}
+
+static inline uint64_t pvr_revision(void)
+{
+	return read_spr(SPR_PVR) & SPR_PVR_REV_MASK;
+}
+
+#endif /* __ASSEMBLER__ */
+#endif /* CPU_PPC64_SPR_H */