linux-kernel - [PATCH 1/2] clk: qocm: add qcom_cc_map

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Message-Id: <20240628-gpucc-no-request-v1-1-b680c2f90817@linaro.org>
Date: Fri, 28 Jun 2024 08:20:22 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org, 
 linux-clk@...r.kernel.org, freedreno@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] clk: qocm: add qcom_cc_map_norequest

The GPU clock controllers use memory region that is a part of the GMU's
memory region. Add qcom_cc_map_norequest() to be used by GPUCC, so that
GPU driver can use devm_ioremap_resource for GMU resources.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/clk/qcom/common.c | 20 ++++++++++++++++++++
 drivers/clk/qcom/common.h |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index c92e10c60322..dcc73bc22606 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -113,6 +113,26 @@ qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 }
 EXPORT_SYMBOL_GPL(qcom_cc_map);
 
+/* gpucc shares memory region with GMU, don't request the region */
+struct regmap *
+qcom_cc_map_norequest(struct platform_device *pdev, const struct qcom_cc_desc *desc)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *r;
+	void __iomem *base;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return ERR_PTR(dev_err_probe(dev, -EINVAL, "resource not found\n"));
+
+	base = devm_ioremap(dev, r->start, resource_size(r));
+	if (IS_ERR(base))
+		return ERR_CAST(base);
+
+	return devm_regmap_init_mmio(dev, base, desc->config);
+}
+EXPORT_SYMBOL_GPL(qcom_cc_map_norequest);
+
 void
 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
 {
diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h
index d048bdeeba10..6cab7805a92c 100644
--- a/drivers/clk/qcom/common.h
+++ b/drivers/clk/qcom/common.h
@@ -60,6 +60,8 @@ extern int qcom_cc_register_sleep_clk(struct device *dev);
 
 extern struct regmap *qcom_cc_map(struct platform_device *pdev,
 				  const struct qcom_cc_desc *desc);
+extern struct regmap *qcom_cc_map_norequest(struct platform_device *pdev,
+					    const struct qcom_cc_desc *desc);
 extern int qcom_cc_really_probe(struct device *dev,
 				const struct qcom_cc_desc *desc,
 				struct regmap *regmap);

-- 
2.39.2