linux-kernel - [PATCH 2/2] PCI: armada8k: Add MSI support for AC5 SoC

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Message-Id: <20221006111110.8574-3-vadym.kochan@plvision.eu>
Date:   Thu,  6 Oct 2022 14:11:10 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Elad Nachman <enachman@...vell.com>,
        Yuval Shaia <yshaia@...vell.com>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Subject: [PATCH 2/2] PCI: armada8k: Add MSI support for AC5 SoC

From: Yuval Shaia <yshaia@...vell.com>

AC5 requieres different handling for MSI as with armada8k.
Fix it by:
1. Enabling the relevant bits in init phase
2. Dispatch virtual IRQ handlers when MSI interrupts are received

Also enable/disable PCIE_APP_LTSSM for AC5.

Signed-off-by: Yuval Shaia <yshaia@...vell.com>
Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
---
 drivers/pci/controller/dwc/pcie-armada8k.c | 28 ++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
index b025d23bb058..c2a285e33e90 100644
--- a/drivers/pci/controller/dwc/pcie-armada8k.c
+++ b/drivers/pci/controller/dwc/pcie-armada8k.c
@@ -45,6 +45,7 @@ struct armada8k_pcie {
 
 #define PCIE_GLOBAL_CONTROL_REG		(PCIE_VENDOR_REGS_OFFSET + 0x0)
 #define PCIE_APP_LTSSM_EN		BIT(2)
+#define PCIE_APP_LTSSM_EN_AC5		BIT(24)
 #define PCIE_DEVICE_TYPE_SHIFT		4
 #define PCIE_DEVICE_TYPE_MASK		0xF
 #define PCIE_DEVICE_TYPE_RC		0x4 /* Root complex */
@@ -64,6 +65,7 @@ struct armada8k_pcie {
 #define PCIE_INT_B_ASSERT_MASK_AC5	BIT(13)
 #define PCIE_INT_C_ASSERT_MASK_AC5	BIT(14)
 #define PCIE_INT_D_ASSERT_MASK_AC5	BIT(15)
+#define PCIE_MSI_MASK_AC5		BIT(11)
 
 #define PCIE_ARCACHE_TRC_REG		(PCIE_VENDOR_REGS_OFFSET + 0x50)
 #define PCIE_AWCACHE_TRC_REG		(PCIE_VENDOR_REGS_OFFSET + 0x54)
@@ -167,16 +169,30 @@ static int armada8k_pcie_link_up(struct dw_pcie *pci)
 
 static int armada8k_pcie_start_link(struct dw_pcie *pci)
 {
+	struct armada8k_pcie *pcie = to_armada8k_pcie(pci);
 	u32 reg;
 
 	/* Start LTSSM */
 	reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
-	reg |= PCIE_APP_LTSSM_EN;
+	if (pcie->pcie_type == MVPCIE_TYPE_AC5)
+		reg |= PCIE_APP_LTSSM_EN_AC5;
+	else
+		reg |= PCIE_APP_LTSSM_EN;
 	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
 
 	return 0;
 }
 
+void ac5_pcie_msi_init(struct dw_pcie *pci)
+{
+	u32 val;
+
+	/* Set MSI bit in interrupt mask */
+	val = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG);
+	val |= PCIE_MSI_MASK_AC5;
+	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, val);
+}
+
 static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
 {
 	u32 reg;
@@ -186,7 +202,10 @@ static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
 	if (!dw_pcie_link_up(pci)) {
 		/* Disable LTSSM state machine to enable configuration */
 		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
-		reg &= ~(PCIE_APP_LTSSM_EN);
+		if (pcie->pcie_type == MVPCIE_TYPE_AC5)
+			reg &= ~(PCIE_APP_LTSSM_EN_AC5);
+		else
+			reg &= ~(PCIE_APP_LTSSM_EN);
 		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
 	}
 
@@ -226,6 +245,9 @@ static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
 		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, reg);
 	}
 
+	if (IS_ENABLED(CONFIG_PCI_MSI) && (pcie->pcie_type == MVPCIE_TYPE_AC5))
+		ac5_pcie_msi_init(pci);
+
 	return 0;
 }
 
@@ -242,6 +264,8 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 	 */
 	val = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG);
 	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG, val);
+	if ((PCIE_MSI_MASK_AC5 & val) && (pcie->pcie_type == MVPCIE_TYPE_AC5))
+		dw_handle_msi_irq(&pci->pp);
 
 	return IRQ_HANDLED;
 }
-- 
2.17.1