linux-kernel - [PATCH v1 05/13] gpu: host1x: Simplify register mapping and add common aperture

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Message-Id: <20220516100213.1536571-6-cyndis@kapsi.fi>
Date:   Mon, 16 May 2022 13:02:05 +0300
From:   cyndis@...si.fi
To:     thierry.reding@...il.com, jonathanh@...dia.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, digetx@...il.com
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH v1 05/13] gpu: host1x: Simplify register mapping and add common aperture

From: Mikko Perttunen <mperttunen@...dia.com>

Refactor 'regs' property loading using devm_platform_ioremap_*
and add loading of the 'common' region found on Tegra234.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/gpu/host1x/dev.c | 46 +++++++++++++++++-----------------------
 drivers/gpu/host1x/dev.h |  3 +++
 2 files changed, 22 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index 89cc79a48eab..8c6ce8014c09 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -40,6 +40,11 @@
 #include "hw/host1x06.h"
 #include "hw/host1x07.h"
 
+void host1x_common_writel(struct host1x *host1x, u32 v, u32 r)
+{
+	writel(v, host1x->common_regs + r);
+}
+
 void host1x_hypervisor_writel(struct host1x *host1x, u32 v, u32 r)
 {
 	writel(v, host1x->hv_regs + r);
@@ -412,7 +417,6 @@ static int host1x_get_resets(struct host1x *host)
 static int host1x_probe(struct platform_device *pdev)
 {
 	struct host1x *host;
-	struct resource *regs, *hv_regs = NULL;
 	int syncpt_irq;
 	int err;
 
@@ -423,25 +427,23 @@ static int host1x_probe(struct platform_device *pdev)
 	host->info = of_device_get_match_data(&pdev->dev);
 
 	if (host->info->has_hypervisor) {
-		regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vm");
-		if (!regs) {
-			dev_err(&pdev->dev, "failed to get vm registers\n");
-			return -ENXIO;
-		}
+		host->regs = devm_platform_ioremap_resource_byname(pdev, "vm");
+		if (IS_ERR(host->regs))
+			return PTR_ERR(host->regs);
+
+		host->hv_regs = devm_platform_ioremap_resource_byname(pdev, "hypervisor");
+		if (IS_ERR(host->hv_regs))
+			return PTR_ERR(host->hv_regs);
 
-		hv_regs = platform_get_resource_byname(pdev, IORESOURCE_MEM,
-						       "hypervisor");
-		if (!hv_regs) {
-			dev_err(&pdev->dev,
-				"failed to get hypervisor registers\n");
-			return -ENXIO;
+		if (host->info->has_common) {
+			host->common_regs = devm_platform_ioremap_resource_byname(pdev, "common");
+			if (IS_ERR(host->common_regs))
+				return PTR_ERR(host->common_regs);
 		}
 	} else {
-		regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		if (!regs) {
-			dev_err(&pdev->dev, "failed to get registers\n");
-			return -ENXIO;
-		}
+		host->regs = devm_platform_ioremap_resource(pdev, 0);
+		if (IS_ERR(host->regs))
+			return PTR_ERR(host->regs);
 	}
 
 	syncpt_irq = platform_get_irq(pdev, 0);
@@ -456,16 +458,6 @@ static int host1x_probe(struct platform_device *pdev)
 	/* set common host1x device data */
 	platform_set_drvdata(pdev, host);
 
-	host->regs = devm_ioremap_resource(&pdev->dev, regs);
-	if (IS_ERR(host->regs))
-		return PTR_ERR(host->regs);
-
-	if (host->info->has_hypervisor) {
-		host->hv_regs = devm_ioremap_resource(&pdev->dev, hv_regs);
-		if (IS_ERR(host->hv_regs))
-			return PTR_ERR(host->hv_regs);
-	}
-
 	host->dev->dma_parms = &host->dma_parms;
 	dma_set_max_seg_size(host->dev, UINT_MAX);
 
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index 7552a4554534..85edcc6e0fc7 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -100,6 +100,7 @@ struct host1x_info {
 	u64 dma_mask; /* mask of addressable memory */
 	bool has_wide_gather; /* supports GATHER_W opcode */
 	bool has_hypervisor; /* has hypervisor registers */
+	bool has_common; /* has common registers separate from hypervisor */
 	unsigned int num_sid_entries;
 	const struct host1x_sid_entry *sid_table;
 	/*
@@ -115,6 +116,7 @@ struct host1x {
 
 	void __iomem *regs;
 	void __iomem *hv_regs; /* hypervisor region */
+	void __iomem *common_regs;
 	struct host1x_syncpt *syncpt;
 	struct host1x_syncpt_base *bases;
 	struct device *dev;
@@ -156,6 +158,7 @@ struct host1x {
 	struct host1x_bo_cache cache;
 };
 
+void host1x_common_writel(struct host1x *host1x, u32 v, u32 r);
 void host1x_hypervisor_writel(struct host1x *host1x, u32 r, u32 v);
 u32 host1x_hypervisor_readl(struct host1x *host1x, u32 r);
 void host1x_sync_writel(struct host1x *host1x, u32 r, u32 v);
-- 
2.36.1