linux-kernel - [PATCH v8 4/6] soc: qcom: Add LLCC support for multi channel DDR

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Date:   Wed, 30 Aug 2023 16:26:52 +0530
From:   Komal Bajaj <quic_kbajaj@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <srinivas.kandagatla@...aro.org>, <bryan.odonoghue@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Komal Bajaj <quic_kbajaj@...cinc.com>
Subject: [PATCH v8 4/6] soc: qcom: Add LLCC support for multi channel DDR

Add LLCC support for multi channel DDR configuration
based on a feature register.

Signed-off-by: Komal Bajaj <quic_kbajaj@...cinc.com>
---
 drivers/soc/qcom/llcc-qcom.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index cbef8d825361..c31d9e39e864 100644
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -12,6 +12,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/nvmem-consumer.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/sizes.h>
@@ -995,6 +996,24 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev,
 	return ret;
 }

+static int qcom_llcc_get_cfg_index(struct platform_device *pdev, u8 *cfg_index, int num_config)
+{
+	int ret;
+
+	ret = nvmem_cell_read_u8(&pdev->dev, "multi-chan-ddr", cfg_index);
+	if (ret == -ENOENT || ret == -EOPNOTSUPP) {
+		if (num_config > 1)
+			return -EINVAL;
+		*cfg_index = 0;
+		return 0;
+	}
+
+	if (!ret && *cfg_index >= num_config)
+		ret = -EINVAL;
+
+	return ret;
+}
+
 static int qcom_llcc_remove(struct platform_device *pdev)
 {
 	/* Set the global pointer to a error code to avoid referencing it */
@@ -1031,6 +1050,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 	const struct qcom_llcc_config *cfg;
 	const struct llcc_slice_config *llcc_cfg;
 	u32 sz;
+	u8 cfg_index;
 	u32 version;
 	struct regmap *regmap;

@@ -1052,7 +1072,10 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 		ret = -EINVAL;
 		goto err;
 	}
-	cfg = &cfgs->llcc_config[0];
+	ret = qcom_llcc_get_cfg_index(pdev, &cfg_index, cfgs->num_config);
+	if (ret)
+		goto err;
+	cfg = &cfgs->llcc_config[cfg_index];

 	ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
 	if (ret)
--
2.41.0