amd64_edac: Cleanup chipselect handling

Add a struct representing the DRAM chip select base/limit register
pairs. Concentrate all CS handling in a single function. Also, add CS
looping macros for cleaner, more readable code. While at it, adjust code
to F15h. Finally, do smaller macro names cleanups (remove family names
from register macros) and debug messages clarification.

No functional change.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

1 files changed, 25 insertions, 56 deletions

diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index a2bc9a650fff..1964f89a28bc 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -160,6 +160,14 @@
 #define OFF false
 
 /*
+ * Create a contiguous bitmask starting at bit position @lo and ending at
+ * position @hi. For example
+ *
+ * GENMASK(21, 39) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(lo, hi)                 (((1ULL << ((hi) - (lo) + 1)) - 1) << (lo))
+
+/*
  * PCI-defined configuration space registers
  */
 
@@ -198,45 +206,14 @@
 /*
  * Function 2 - DRAM controller
  */
-#define K8_DCSB0                        0x40
-#define F10_DCSB1                       0x140
-
-#define K8_DCSB_CS_ENABLE               BIT(0)
-#define K8_DCSB_NPT_SPARE               BIT(1)
-#define K8_DCSB_NPT_TESTFAIL            BIT(2)
-
-/*
- * REV E: select [31:21] and [15:9] from DCSB and the shift amount to form
- * the address
- */
-#define REV_E_DCSB_BASE_BITS            (0xFFE0FE00ULL)
-#define REV_E_DCS_SHIFT                 4
-
-#define REV_F_F1Xh_DCSB_BASE_BITS       (0x1FF83FE0ULL)
-#define REV_F_F1Xh_DCS_SHIFT            8
-
-/*
- * REV F and later: selects [28:19] and [13:5] from DCSB and the shift amount
- * to form the address
- */
-#define REV_F_DCSB_BASE_BITS            (0x1FF83FE0ULL)
-#define REV_F_DCS_SHIFT                 8
-
-/* DRAM CS Mask Registers */
-#define K8_DCSM0                        0x60
-#define F10_DCSM1                       0x160
-
-/* REV E: select [29:21] and [15:9] from DCSM */
-#define REV_E_DCSM_MASK_BITS            0x3FE0FE00
-
-/* unused bits [24:20] and [12:0] */
-#define REV_E_DCS_NOTUSED_BITS          0x01F01FFF
+#define DCSB0                           0x40
+#define DCSB1                           0x140
+#define DCSB_CS_ENABLE                  BIT(0)
 
-/* REV F and later: select [28:19] and [13:5] from DCSM */
-#define REV_F_F1Xh_DCSM_MASK_BITS       0x1FF83FE0
+#define DCSM0                           0x60
+#define DCSM1                           0x160
 
-/* unused bits [26:22] and [12:0] */
-#define REV_F_F1Xh_DCS_NOTUSED_BITS     0x07C01FFF
+#define csrow_enabled(i, dct, pvt)      ((pvt)->csels[(dct)].csbases[(i)] & DCSB_CS_ENABLE)
 
 #define DBAM0                           0x80
 #define DBAM1                           0x180
@@ -412,6 +389,15 @@ struct dram_range {
         struct reg_pair lim;
 };
 
+/* A DCT chip selects collection */
+struct chip_select {
+        u32 csbases[NUM_CHIPSELECTS];
+        u8 b_cnt;
+
+        u32 csmasks[NUM_CHIPSELECTS];
+        u8 m_cnt;
+};
+
 struct amd64_pvt {
         struct low_ops *ops;
 
@@ -434,29 +420,12 @@ struct amd64_pvt {
         u32 dbam0;              /* DRAM Base Address Mapping reg for DCT0 */
         u32 dbam1;              /* DRAM Base Address Mapping reg for DCT1 */
 
-        /* DRAM CS Base Address Registers F2x[1,0][5C:40] */
-        u32 dcsb0[NUM_CHIPSELECTS];
-        u32 dcsb1[NUM_CHIPSELECTS];
-
-        /* DRAM CS Mask Registers F2x[1,0][6C:60] */
-        u32 dcsm0[NUM_CHIPSELECTS];
-        u32 dcsm1[NUM_CHIPSELECTS];
+        /* one for each DCT */
+        struct chip_select csels[2];
 
         /* DRAM base and limit pairs F1x[78,70,68,60,58,50,48,40] */
         struct dram_range ranges[DRAM_RANGES];
 
-        /*
-         * The following fields are set at (load) run time, after CPU revision
-         * has been determined, since the dct_base and dct_mask registers vary
-         * based on revision
-         */
-        u32 dcsb_base;          /* DCSB base bits */
-        u32 dcsm_mask;          /* DCSM mask bits */
-        u32 cs_count;           /* num chip selects (== num DCSB registers) */
-        u32 num_dcsm;           /* Number of DCSM registers */
-        u32 dcs_mask_notused;   /* DCSM notused mask bits */
-        u32 dcs_shift;          /* DCSB and DCSM shift value */
-
         u64 top_mem;            /* top of memory below 4GB */
         u64 top_mem2;           /* top of memory above 4GB */