linux-kernel - [PATCH 5/5] soc: qcom: llcc: Add regmap for Broadcast

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Date: Fri, 26 Jan 2024 11:47:21 -0800
From: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof
 Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel@...cinc.com>
Subject: [PATCH 5/5] soc: qcom: llcc: Add regmap for Broadcast_AND region

To support CSR programming, a broadcast interface is used to program
all channels in a single command. Until SM8450 there was only one
broadcast region (Broadcast_OR) used to broadcast write and check
for status bit 0. From SM8450 onwards another broadcast region
(Broadcast_AND) has been added which checks for status bit 1.

Update llcc_drv_data structure with new regmap for Broadcast_AND
region and initialize regmap for Broadcast_AND region when HW block
version is greater than 4.1 for backwards compatibility.

Switch from broadcast_OR to broadcast_AND region for checking
status bit 1 as Broadcast_OR region checks only for bit 0.
While at it, also check return value after reading Broadcast_OR
region in llcc_update_act_ctrl().

Signed-off-by: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
---
 drivers/soc/qcom/llcc-qcom.c       | 12 +++++++++++-
 include/linux/soc/qcom/llcc-qcom.h |  4 +++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index 4ca88eaebf06..5a2dac2d4772 100644
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -849,7 +849,7 @@ static int llcc_update_act_ctrl(u32 sid,
 		return ret;
 
 	if (drv_data->version >= LLCC_VERSION_4_1_0_0) {
-		ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
+		ret = regmap_read_poll_timeout(drv_data->bcast_and_regmap, status_reg,
 				      slice_status, (slice_status & ACT_COMPLETE),
 				      0, LLCC_STATUS_READ_DELAY);
 		if (ret)
@@ -859,6 +859,8 @@ static int llcc_update_act_ctrl(u32 sid,
 	ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
 				      slice_status, !(slice_status & status),
 				      0, LLCC_STATUS_READ_DELAY);
+	if (ret)
+		return ret;
 
 	if (drv_data->version >= LLCC_VERSION_4_1_0_0)
 		ret = regmap_write(drv_data->bcast_regmap, act_clear_reg,
@@ -1282,6 +1284,14 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 
 	drv_data->version = version;
 
+	if (drv_data->version >= LLCC_VERSION_4_1_0_0) {
+		drv_data->bcast_and_regmap = qcom_llcc_init_mmio(pdev, i + 1, "llcc_broadcast_and_base");
+		if (IS_ERR(drv_data->bcast_and_regmap)) {
+			ret = PTR_ERR(drv_data->bcast_and_regmap);
+			goto err;
+		}
+	}
+
 	llcc_cfg = cfg->sct_data;
 	sz = cfg->size;
 
diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
index 1a886666bbb6..9e9f528b1370 100644
--- a/include/linux/soc/qcom/llcc-qcom.h
+++ b/include/linux/soc/qcom/llcc-qcom.h
@@ -115,7 +115,8 @@ struct llcc_edac_reg_offset {
 /**
  * struct llcc_drv_data - Data associated with the llcc driver
  * @regmaps: regmaps associated with the llcc device
- * @bcast_regmap: regmap associated with llcc broadcast offset
+ * @bcast_regmap: regmap associated with llcc broadcast OR offset
+ * @bcast_and_regmap: regmap associated with llcc broadcast AND offset
  * @cfg: pointer to the data structure for slice configuration
  * @edac_reg_offset: Offset of the LLCC EDAC registers
  * @lock: mutex associated with each slice
@@ -129,6 +130,7 @@ struct llcc_edac_reg_offset {
 struct llcc_drv_data {
 	struct regmap **regmaps;
 	struct regmap *bcast_regmap;
+	struct regmap *bcast_and_regmap;
 	const struct llcc_slice_config *cfg;
 	const struct llcc_edac_reg_offset *edac_reg_offset;
 	struct mutex lock;
-- 
2.25.1