1 files changed, 137 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c
new file mode 100644
index 00000000000..87d5605bdda
--- /dev/null
+++ b/tools/power/cpupower/utils/helpers/amd.c
@@ -0,0 +1,137 @@
+#if defined(__i386__) || defined(__x86_64__)
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include <pci/pci.h>
+
+#include "helpers/helpers.h"
+
+#define MSR_AMD_PSTATE_STATUS	0xc0010063
+#define MSR_AMD_PSTATE		0xc0010064
+#define MSR_AMD_PSTATE_LIMIT	0xc0010061
+
+union msr_pstate {
+	struct {
+		unsigned fid:6;
+		unsigned did:3;
+		unsigned vid:7;
+		unsigned res1:6;
+		unsigned nbdid:1;
+		unsigned res2:2;
+		unsigned nbvid:7;
+		unsigned iddval:8;
+		unsigned idddiv:2;
+		unsigned res3:21;
+		unsigned en:1;
+	} bits;
+	unsigned long long val;
+};
+
+static int get_did(int family, union msr_pstate pstate)
+{
+	int t;
+
+	if (family == 0x12)
+		t = pstate.val & 0xf;
+	else
+		t = pstate.bits.did;
+
+	return t;
+}
+
+static int get_cof(int family, union msr_pstate pstate)
+{
+	int t;
+	int fid, did;
+
+	did = get_did(family, pstate);
+
+	t = 0x10;
+	fid = pstate.bits.fid;
+	if (family == 0x11)
+		t = 0x8;
+
+	return (100 * (fid + t)) >> did;
+}
+
+/* Needs:
+ * cpu          -> the cpu that gets evaluated
+ * cpu_family   -> The cpu's family (0x10, 0x12,...)
+ * boots_states -> how much boost states the machines support
+ *
+ * Fills up:
+ * pstates -> a pointer to an array of size MAX_HW_PSTATES
+ *            must be initialized with zeros.
+ *            All available  HW pstates (including boost states)
+ * no      -> amount of pstates above array got filled up with
+ *
+ * returns zero on success, -1 on failure
+ */
+int decode_pstates(unsigned int cpu, unsigned int cpu_family,
+		   int boost_states, unsigned long *pstates, int *no)
+{
+	int i, psmax, pscur;
+	union msr_pstate pstate;
+	unsigned long long val;
+
+	/* Only read out frequencies from HW when CPU might be boostable
+	   to keep the code as short and clean as possible.
+	   Otherwise frequencies are exported via ACPI tables.
+	*/
+	if (cpu_family < 0x10 || cpu_family == 0x14)
+		return -1;
+
+	if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
+		return -1;
+
+	psmax = (val >> 4) & 0x7;
+
+	if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
+		return -1;
+
+	pscur = val & 0x7;
+
+	pscur += boost_states;
+	psmax += boost_states;
+	for (i = 0; i <= psmax; i++) {
+		if (i >= MAX_HW_PSTATES) {
+			fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
+				psmax, MAX_HW_PSTATES);
+			return -1;
+		}
+		if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
+			return -1;
+		pstates[i] = get_cof(cpu_family, pstate);
+	}
+	*no = i;
+	return 0;
+}
+
+int amd_pci_get_num_boost_states(int *active, int *states)
+{
+	struct pci_access *pci_acc;
+	int vendor_id = 0x1022;
+	int boost_dev_ids[4] = {0x1204, 0x1604, 0x1704, 0};
+	struct pci_dev *device;
+	uint8_t val = 0;
+
+	*active = *states = 0;
+
+	device = pci_acc_init(&pci_acc, vendor_id, boost_dev_ids);
+
+	if (device == NULL)
+		return -ENODEV;
+
+	val = pci_read_byte(device, 0x15c);
+	if (val & 3)
+		*active = 1;
+	else
+		*active = 0;
+	*states = (val >> 2) & 7;
+
+	pci_cleanup(pci_acc);
+	return 0;
+}
+#endif /* defined(__i386__) || defined(__x86_64__) */