qcom: llcc/edac: Fix the base address used for accessing LLCC banks

The Qualcomm LLCC/EDAC drivers were using a fixed register stride for
accessing the (Control and Status Registers) CSRs of each LLCC bank.
This stride only works for some SoCs like SDM845 for which driver
support was initially added.

But the later SoCs use different register stride that vary between the
banks with holes in-between. So it is not possible to use a single register
stride for accessing the CSRs of each bank. By doing so could result in a
crash.

For fixing this issue, let's obtain the base address of each LLCC bank from
devicetree and get rid of the fixed stride. This also means, there is no
need to rely on reg-names property and the base addresses can be obtained
using the index.

First index is LLCC bank 0 and last index is LLCC broadcast. If the SoC
supports more than one bank, then those need to be defined in devicetree
for index from 1..N-1.

Reported-by: Parikshit Pareek <quic_ppareek@quicinc.com>
Tested-by: Luca Weiss <luca.weiss@fairphone.com>
Tested-by: Steev Klimaszewski <steev@kali.org> # Thinkpad X13s
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sa8540p-ride
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230314080443.64635-13-manivannan.sadhasivam@linaro.org

1 files changed, 2 insertions, 4 deletions

diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
index ad1fd718169d..423220e66026 100644
--- a/include/linux/soc/qcom/llcc-qcom.h
+++ b/include/linux/soc/qcom/llcc-qcom.h
@@ -120,7 +120,7 @@ struct llcc_edac_reg_offset {
 
 /**
  * struct llcc_drv_data - Data associated with the llcc driver
- * @regmap: regmap associated with the llcc device
+ * @regmaps: regmaps associated with the llcc device
  * @bcast_regmap: regmap associated with llcc broadcast offset
  * @cfg: pointer to the data structure for slice configuration
  * @edac_reg_offset: Offset of the LLCC EDAC registers
@@ -129,12 +129,11 @@ struct llcc_edac_reg_offset {
  * @max_slices: max slices as read from device tree
  * @num_banks: Number of llcc banks
  * @bitmap: Bit map to track the active slice ids
- * @offsets: Pointer to the bank offsets array
  * @ecc_irq: interrupt for llcc cache error detection and reporting
  * @version: Indicates the LLCC version
  */
 struct llcc_drv_data {
-	struct regmap *regmap;
+	struct regmap **regmaps;
 	struct regmap *bcast_regmap;
 	const struct llcc_slice_config *cfg;
 	const struct llcc_edac_reg_offset *edac_reg_offset;
@@ -143,7 +142,6 @@ struct llcc_drv_data {
 	u32 max_slices;
 	u32 num_banks;
 	unsigned long *bitmap;
-	u32 *offsets;
 	int ecc_irq;
 	u32 version;
 };