linux-kernel - [PATCHv2 3/9] soc: qcom: llcc: Add write-cache cacheable support

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Date:   Fri, 28 Jan 2022 13:17:10 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Prasad <quic_psodagud@...cinc.com>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>
Subject: [PATCHv2 3/9] soc: qcom: llcc: Add write-cache cacheable support

Newer SoCs with LLCC IP version 2.1.0.0 and later support write
sub-cache cacheable feature. Use a separate llcc_slice_config member
"write_scid_cacheable_en" to identify this feature and program
LLCC_TRP_SCID_WRSC_CACHEABLE_EN register to enable it.

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@...cinc.com>
---
 drivers/soc/qcom/llcc-qcom.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index 8d4953800fa9..e845d3919ef3 100644
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -51,10 +51,12 @@
 #define LLCC_TRP_SCID_DIS_CAP_ALLOC   0x21f00
 #define LLCC_TRP_PCB_ACT              0x21f04
 #define LLCC_TRP_WRSC_EN              0x21f20
+#define LLCC_TRP_WRSC_CACHEABLE_EN    0x21f2c
 
 #define BANK_OFFSET_STRIDE	      0x80000
 
 #define LLCC_VERSION_2_0_0_0          0x02000000
+#define LLCC_VERSION_2_1_0_0          0x02010000
 
 /**
  * struct llcc_slice_config - Data associated with the llcc slice
@@ -80,6 +82,8 @@
  *               collapse.
  * @activate_on_init: Activate the slice immediately after it is programmed
  * @write_scid_en: Bit enables write cache support for a given scid.
+ * @write_scid_cacheable_en: Enables write cache cacheable support for a
+ *			     given scid (not supported on v2 or older hardware).
  */
 struct llcc_slice_config {
 	u32 usecase_id;
@@ -95,6 +99,7 @@ struct llcc_slice_config {
 	bool retain_on_pc;
 	bool activate_on_init;
 	bool write_scid_en;
+	bool write_scid_cacheable_en;
 };
 
 struct qcom_llcc_config {
@@ -515,6 +520,16 @@ static int _qcom_llcc_cfg_program(const struct llcc_slice_config *config,
 			return ret;
 	}
 
+	if (drv_data->version >= LLCC_VERSION_2_1_0_0) {
+		u32 wr_cache_en;
+
+		wr_cache_en = config->write_scid_cacheable_en << config->slice_id;
+		ret = regmap_update_bits(drv_data->bcast_regmap, LLCC_TRP_WRSC_CACHEABLE_EN,
+					 BIT(config->slice_id), wr_cache_en);
+		if (ret)
+			return ret;
+	}
+
 	if (config->activate_on_init) {
 		desc.slice_id = config->slice_id;
 		ret = llcc_slice_activate(&desc);
-- 
2.33.1