[PATCH v3 3/6] bus: mhi: core: Offload register accesses to the controller

[Jeffrey Hugo]

When reading or writing MHI registers, the core assumes that the physical
link is a memory mapped PCI link.  This assumption may not hold for all
MHI devices.  The controller knows what is the physical link (ie PCI, I2C,
SPI, etc), and therefore knows the proper methods to access that link.
The controller can also handle link specific error scenarios, such as
reading -1 when the PCI link went down.

Therefore, it is appropriate that the MHI core requests the controller to
make register accesses on behalf of the core, which abstracts the core
from link specifics, and end up removing an unnecessary assumption.

Signed-off-by: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>
---
 drivers/bus/mhi/core/init.c     |  3 ++-
 drivers/bus/mhi/core/internal.h |  3 ---
 drivers/bus/mhi/core/main.c     | 12 ++----------
 include/linux/mhi.h             |  6 ++++++
 4 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 2af08d57..eb2ab05 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -813,7 +813,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
 		return -EINVAL;
 
 	if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
-	    !mhi_cntrl->status_cb)
+	    !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
+	    !mhi_cntrl->write_reg)
 		return -EINVAL;
 
 	ret = parse_config(mhi_cntrl, config);
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 5deadfa..095d95b 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -11,9 +11,6 @@
 
 extern struct bus_type mhi_bus_type;
 
-/* MHI MMIO register mapping */
-#define PCI_INVALID_READ(val) (val == U32_MAX)
-
 #define MHIREGLEN (0x0)
 #define MHIREGLEN_MHIREGLEN_MASK (0xFFFFFFFF)
 #define MHIREGLEN_MHIREGLEN_SHIFT (0)
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 473278b8..580d72b 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -18,15 +18,7 @@
 int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl,
 			      void __iomem *base, u32 offset, u32 *out)
 {
-	u32 tmp = readl(base + offset);
-
-	/* If the value is invalid, the link is down */
-	if (PCI_INVALID_READ(tmp))
-		return -EIO;
-
-	*out = tmp;
-
-	return 0;
+	return mhi_cntrl->read_reg(mhi_cntrl, base + offset, out);
 }
 
 int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl,
@@ -48,7 +40,7 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl,
 void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base,
 		   u32 offset, u32 val)
 {
-	writel(val, base + offset);
+	mhi_cntrl->write_reg(mhi_cntrl, base + offset, val);
 }
 
 void mhi_write_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base,
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index be704a4..225a03a 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -342,6 +342,8 @@ struct mhi_controller_config {
  * @runtimet_put: CB function to decrement pm usage (required)
  * @map_single: CB function to create TRE buffer
  * @unmap_single: CB function to destroy TRE buffer
+ * @read_reg: Read a MHI register via the physical link (required)
+ * @write_reg: Write a MHI register via the physical link (required)
  * @buffer_len: Bounce buffer length
  * @bounce_buf: Use of bounce buffer
  * @fbc_download: MHI host needs to do complete image transfer (optional)
@@ -425,6 +427,10 @@ struct mhi_controller {
 			  struct mhi_buf_info *buf);
 	void (*unmap_single)(struct mhi_controller *mhi_cntrl,
 			     struct mhi_buf_info *buf);
+	int (*read_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
+			u32 *out);
+	void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
+			  u32 val);
 
 	size_t buffer_len;
 	bool bounce_buf;
-- 
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