linux-kernel - [PATCH v1 4/5] regmap: mmio: Get rid of broken 64-bit IO

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Date:   Fri,  5 Aug 2022 23:53:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v1 4/5] regmap: mmio: Get rid of broken 64-bit IO

The current implementation, besides having no active users, is broken
by design of regmap. For 64-bit IO we need to supply 64-bit value,
otherwise there is no way to handle upper 32 bits in 64-bit register.

Hence, remove the broken IO accessors for good and wait for real user
that can fix entire regmap API for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/base/regmap/regmap-mmio.c | 49 -------------------------------
 1 file changed, 49 deletions(-)

diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index c2b18973144b..698295a8f5a6 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -32,9 +32,6 @@ static int regmap_mmio_regbits_check(size_t reg_bits)
 	case 8:
 	case 16:
 	case 32:
-#ifdef CONFIG_64BIT
-	case 64:
-#endif
 		return 0;
 	default:
 		return -EINVAL;
@@ -56,11 +53,6 @@ static int regmap_mmio_get_min_stride(size_t val_bits)
 	case 32:
 		min_stride = 4;
 		break;
-#ifdef CONFIG_64BIT
-	case 64:
-		min_stride = 8;
-		break;
-#endif
 	default:
 		return -EINVAL;
 	}
@@ -124,22 +116,6 @@ static void regmap_mmio_write32be(struct regmap_mmio_context *ctx,
 	iowrite32be(val, ctx->regs + reg);
 }
 
-#ifdef CONFIG_64BIT
-static void regmap_mmio_write64le(struct regmap_mmio_context *ctx,
-				  unsigned int reg,
-				  unsigned int val)
-{
-	writeq(val, ctx->regs + reg);
-}
-
-static void regmap_mmio_write64le_relaxed(struct regmap_mmio_context *ctx,
-				  unsigned int reg,
-				  unsigned int val)
-{
-	writeq_relaxed(val, ctx->regs + reg);
-}
-#endif
-
 static int regmap_mmio_write(void *context, unsigned int reg, unsigned int val)
 {
 	struct regmap_mmio_context *ctx = context;
@@ -204,20 +180,6 @@ static unsigned int regmap_mmio_read32be(struct regmap_mmio_context *ctx,
 	return ioread32be(ctx->regs + reg);
 }
 
-#ifdef CONFIG_64BIT
-static unsigned int regmap_mmio_read64le(struct regmap_mmio_context *ctx,
-				         unsigned int reg)
-{
-	return readq(ctx->regs + reg);
-}
-
-static unsigned int regmap_mmio_read64le_relaxed(struct regmap_mmio_context *ctx,
-						 unsigned int reg)
-{
-	return readq_relaxed(ctx->regs + reg);
-}
-#endif
-
 static int regmap_mmio_read(void *context, unsigned int reg, unsigned int *val)
 {
 	struct regmap_mmio_context *ctx = context;
@@ -317,17 +279,6 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
 				ctx->reg_write = regmap_mmio_write32le;
 			}
 			break;
-#ifdef CONFIG_64BIT
-		case 64:
-			if (config->use_relaxed_mmio) {
-				ctx->reg_read = regmap_mmio_read64le_relaxed;
-				ctx->reg_write = regmap_mmio_write64le_relaxed;
-			} else {
-				ctx->reg_read = regmap_mmio_read64le;
-				ctx->reg_write = regmap_mmio_write64le;
-			}
-			break;
-#endif
 		default:
 			ret = -EINVAL;
 			goto err_free;
-- 
2.35.1