linux-kernel - [PATCH 2/2] PCI: mediatek-gen3: Allocate MSI address with dmam_alloc

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Message-ID: <20231206083753.18186-3-jianjun.wang@mediatek.com>
Date:   Wed, 6 Dec 2023 16:37:53 +0800
From:   Jianjun Wang <jianjun.wang@...iatek.com>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        <linux-pci@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <jieyy.yang@...iatek.com>,
        <chuanjia.liu@...iatek.com>, <qizhong.cheng@...iatek.com>,
        <jian.yang@...iatek.com>, <jianguo.zhang@...iatek.com>
Subject: [PATCH 2/2] PCI: mediatek-gen3: Allocate MSI address with dmam_alloc_coherent

Use 'dmam_alloc_coherent' to allocate the MSI address, instead of using
static physical address.

Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
---
 drivers/pci/controller/pcie-mediatek-gen3.c | 30 +++++++++++----------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index e0e27645fdf4..0b1b5c8e5288 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -108,7 +108,7 @@
  */
 struct mtk_msi_set {
 	void __iomem *base;
-	phys_addr_t msg_addr;
+	dma_addr_t msg_addr;
 	u32 saved_irq_state;
 };
 
@@ -116,7 +116,6 @@ struct mtk_msi_set {
  * struct mtk_gen3_pcie - PCIe port information
  * @dev: pointer to PCIe device
  * @base: IO mapped register base
- * @reg_base: physical register base
  * @mac_reset: MAC reset control
  * @phy_reset: PHY reset control
  * @phy: PHY controller block
@@ -135,7 +134,6 @@ struct mtk_msi_set {
 struct mtk_gen3_pcie {
 	struct device *dev;
 	void __iomem *base;
-	phys_addr_t reg_base;
 	struct reset_control *mac_reset;
 	struct reset_control *phy_reset;
 	struct phy *phy;
@@ -278,18 +276,24 @@ static int mtk_pcie_set_trans_table(struct mtk_gen3_pcie *pcie,
 	return 0;
 }
 
-static void mtk_pcie_enable_msi(struct mtk_gen3_pcie *pcie)
+static int mtk_pcie_enable_msi(struct mtk_gen3_pcie *pcie)
 {
 	int i;
 	u32 val;
+	void *msi_vaddr;
 
 	for (i = 0; i < PCIE_MSI_SET_NUM; i++) {
 		struct mtk_msi_set *msi_set = &pcie->msi_sets[i];
 
 		msi_set->base = pcie->base + PCIE_MSI_SET_BASE_REG +
 				i * PCIE_MSI_SET_OFFSET;
-		msi_set->msg_addr = pcie->reg_base + PCIE_MSI_SET_BASE_REG +
-				    i * PCIE_MSI_SET_OFFSET;
+
+		msi_vaddr = dmam_alloc_coherent(pcie->dev, sizeof(dma_addr_t), &msi_set->msg_addr,
+						GFP_KERNEL);
+		if (!msi_vaddr) {
+			dev_err(pcie->dev, "failed to alloc and map MSI data for set %d\n", i);
+			return -ENOMEM;
+		}
 
 		/* Configure the MSI capture address */
 		writel_relaxed(lower_32_bits(msi_set->msg_addr), msi_set->base);
@@ -305,6 +309,8 @@ static void mtk_pcie_enable_msi(struct mtk_gen3_pcie *pcie)
 	val = readl_relaxed(pcie->base + PCIE_INT_ENABLE_REG);
 	val |= PCIE_MSI_ENABLE;
 	writel_relaxed(val, pcie->base + PCIE_INT_ENABLE_REG);
+
+	return 0;
 }
 
 static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
@@ -371,7 +377,9 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
 		return err;
 	}
 
-	mtk_pcie_enable_msi(pcie);
+	err = mtk_pcie_enable_msi(pcie);
+	if (err)
+		return err;
 
 	/* Set PCIe translation windows */
 	resource_list_for_each_entry(entry, &host->windows) {
@@ -762,20 +770,14 @@ static int mtk_pcie_parse_port(struct mtk_gen3_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
 	struct platform_device *pdev = to_platform_device(dev);
-	struct resource *regs;
 	int ret;
 
-	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcie-mac");
-	if (!regs)
-		return -EINVAL;
-	pcie->base = devm_ioremap_resource(dev, regs);
+	pcie->base = devm_platform_ioremap_resource_byname(pdev, "pcie-mac");
 	if (IS_ERR(pcie->base)) {
 		dev_err(dev, "failed to map register base\n");
 		return PTR_ERR(pcie->base);
 	}
 
-	pcie->reg_base = regs->start;
-
 	pcie->phy_reset = devm_reset_control_get_optional_exclusive(dev, "phy");
 	if (IS_ERR(pcie->phy_reset)) {
 		ret = PTR_ERR(pcie->phy_reset);
-- 
2.18.0