mtd: brcmnand: factor out CFG and CFG_EXT bitfields

Use enum instead of magic numbers for CFG and CFG_EXT bitfields.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by: Anup Patel <anup.patel@broadcom.com>

1 files changed, 31 insertions, 7 deletions

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index 7c1c306650a4..3bd31a6055b6 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -344,6 +344,28 @@ static const u8 brcmnand_cs_offsets_cs0[] = {
         [BRCMNAND_CS_TIMING2]           = 0x14,
 };
 
+/*
+ * Bitfields for the CFG and CFG_EXT registers. Pre-v7.1 controllers only had
+ * one config register, but once the bitfields overflowed, newer controllers
+ * (v7.1 and newer) added a CFG_EXT register and shuffled a few fields around.
+ */
+enum {
+        CFG_BLK_ADR_BYTES_SHIFT         = 8,
+        CFG_COL_ADR_BYTES_SHIFT         = 12,
+        CFG_FUL_ADR_BYTES_SHIFT         = 16,
+        CFG_BUS_WIDTH_SHIFT             = 23,
+        CFG_BUS_WIDTH                   = BIT(CFG_BUS_WIDTH_SHIFT),
+        CFG_DEVICE_SIZE_SHIFT           = 24,
+
+        /* Only for pre-v7.1 (with no CFG_EXT register) */
+        CFG_PAGE_SIZE_SHIFT             = 20,
+        CFG_BLK_SIZE_SHIFT              = 28,
+
+        /* Only for v7.1+ (with CFG_EXT register) */
+        CFG_EXT_PAGE_SIZE_SHIFT         = 0,
+        CFG_EXT_BLK_SIZE_SHIFT          = 4,
+};
+
 /* BRCMNAND_INTFC_STATUS */
 enum {
         INTFC_FLASH_STATUS              = GENMASK(7, 0),
@@ -1720,17 +1742,19 @@ static int brcmnand_set_cfg(struct brcmnand_host *host,
         }
         device_size = fls64(cfg->device_size) - fls64(BRCMNAND_MIN_DEVSIZE);
 
-        tmp = (cfg->blk_adr_bytes << 8) |
-                (cfg->col_adr_bytes << 12) |
-                (cfg->ful_adr_bytes << 16) |
-                (!!(cfg->device_width == 16) << 23) |
-                (device_size << 24);
+        tmp = (cfg->blk_adr_bytes << CFG_BLK_ADR_BYTES_SHIFT) |
+                (cfg->col_adr_bytes << CFG_COL_ADR_BYTES_SHIFT) |
+                (cfg->ful_adr_bytes << CFG_FUL_ADR_BYTES_SHIFT) |
+                (!!(cfg->device_width == 16) << CFG_BUS_WIDTH_SHIFT) |
+                (device_size << CFG_DEVICE_SIZE_SHIFT);
         if (cfg_offs == cfg_ext_offs) {
-                tmp |= (page_size << 20) | (block_size << 28);
+                tmp |= (page_size << CFG_PAGE_SIZE_SHIFT) |
+                       (block_size << CFG_BLK_SIZE_SHIFT);
                 nand_writereg(ctrl, cfg_offs, tmp);
         } else {
                 nand_writereg(ctrl, cfg_offs, tmp);
-                tmp = page_size | (block_size << 4);
+                tmp = (page_size << CFG_EXT_PAGE_SIZE_SHIFT) |
+                      (block_size << CFG_EXT_BLK_SIZE_SHIFT);
                 nand_writereg(ctrl, cfg_ext_offs, tmp);
         }