[PATCH v2] PCI: mvebu: Setup BAR0 in order to fix MSI

[PATCH v2] PCI: mvebu: Setup BAR0 in order to fix MSI

[Shmuel Hazan]

According to the Armada XP datasheet, section 10.2.6: "in order for
the device to do a write to the MSI doorbell address, it needs to write
to a register in the internal registers space".

As a result of the requirement above, without this patch, MSI won't
function and therefore some devices won't operate properly without
pci=nomsi.

This requirement was not present at the time of writing this driver
since the vendor u-boot always initializes all PCIe controllers
(incl. BAR0 initialization) and for some time, the vendor u-boot was
the only available bootloader for this driver's SoCs (e.g. A38x,A37x,
etc).

Tested on an Armada 385 board on mainline u-boot (2020.4), without
u-boot PCI initialization and the following PCIe devices:
        - Wilocity Wil6200 rev 2 (wil6210)
        - Qualcomm Atheros QCA6174 (ath10k_pci)

Both failed to get a response from the device after loading the
firmware and seem to operate properly with this patch.
---

Changes in v2:
	* Explained more about the reason this bug was not detected
	  earlier. 
	* Edited commit subject line.

---
 drivers/pci/controller/pci-mvebu.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 153a64676bc9..101c06602aa1 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -105,6 +105,7 @@ struct mvebu_pcie_port {
 	struct mvebu_pcie_window memwin;
 	struct mvebu_pcie_window iowin;
 	u32 saved_pcie_stat;
+	struct resource regs;
 };
 
 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
@@ -149,7 +150,9 @@ static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
 
 /*
  * Setup PCIE BARs and Address Decode Wins:
- * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
+ * BAR[0] -> internal registers (needed for MSI)
+ * BAR[1] -> covers all DRAM banks
+ * BAR[2] -> Disabled
  * WIN[0-3] -> DRAM bank[0-3]
  */
 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
@@ -203,6 +206,12 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
 	mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
 	mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
 		     PCIE_BAR_CTRL_OFF(1));
+
+	/*
+	 * Point BAR[0] to the device's internal registers.
+	 */
+	mvebu_writel(port, round_down(port->regs.start, SZ_1M), PCIE_BAR_LO_OFF(0));
+	mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0));
 }
 
 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
@@ -708,14 +717,13 @@ static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
 					      struct device_node *np,
 					      struct mvebu_pcie_port *port)
 {
-	struct resource regs;
 	int ret = 0;
 
-	ret = of_address_to_resource(np, 0, &regs);
+	ret = of_address_to_resource(np, 0, &port->regs);
 	if (ret)
 		return (void __iomem *)ERR_PTR(ret);
 
-	return devm_ioremap_resource(&pdev->dev, &regs);
+	return devm_ioremap_resource(&pdev->dev, &port->regs);
 }
 
 #define DT_FLAGS_TO_TYPE(flags)       (((flags) >> 24) & 0x03)
-- 
2.27.0

Re: [PATCH v2] PCI: mvebu: Setup BAR0 in order to fix MSI

[Baruch Siach]

Hi Shmuel,

On Tue, Jun 23 2020, Shmuel Hazan wrote:
> According to the Armada XP datasheet, section 10.2.6: "in order for
> the device to do a write to the MSI doorbell address, it needs to write
> to a register in the internal registers space".
>
> As a result of the requirement above, without this patch, MSI won't
> function and therefore some devices won't operate properly without
> pci=nomsi.
>
> This requirement was not present at the time of writing this driver
> since the vendor u-boot always initializes all PCIe controllers
> (incl. BAR0 initialization) and for some time, the vendor u-boot was
> the only available bootloader for this driver's SoCs (e.g. A38x,A37x,
> etc).
>
> Tested on an Armada 385 board on mainline u-boot (2020.4), without
> u-boot PCI initialization and the following PCIe devices:
>         - Wilocity Wil6200 rev 2 (wil6210)
>         - Qualcomm Atheros QCA6174 (ath10k_pci)
>
> Both failed to get a response from the device after loading the
> firmware and seem to operate properly with this patch.

You forgot your sign-off.

baruch

> ---
>
> Changes in v2:
> 	* Explained more about the reason this bug was not detected
> 	  earlier. 
> 	* Edited commit subject line.
>
> ---
>  drivers/pci/controller/pci-mvebu.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index 153a64676bc9..101c06602aa1 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -105,6 +105,7 @@ struct mvebu_pcie_port {
>  	struct mvebu_pcie_window memwin;
>  	struct mvebu_pcie_window iowin;
>  	u32 saved_pcie_stat;
> +	struct resource regs;
>  };
>  
>  static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
> @@ -149,7 +150,9 @@ static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
>  
>  /*
>   * Setup PCIE BARs and Address Decode Wins:
> - * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
> + * BAR[0] -> internal registers (needed for MSI)
> + * BAR[1] -> covers all DRAM banks
> + * BAR[2] -> Disabled
>   * WIN[0-3] -> DRAM bank[0-3]
>   */
>  static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
> @@ -203,6 +206,12 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
>  	mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
>  	mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
>  		     PCIE_BAR_CTRL_OFF(1));
> +
> +	/*
> +	 * Point BAR[0] to the device's internal registers.
> +	 */
> +	mvebu_writel(port, round_down(port->regs.start, SZ_1M), PCIE_BAR_LO_OFF(0));
> +	mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0));
>  }
>  
>  static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> @@ -708,14 +717,13 @@ static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
>  					      struct device_node *np,
>  					      struct mvebu_pcie_port *port)
>  {
> -	struct resource regs;
>  	int ret = 0;
>  
> -	ret = of_address_to_resource(np, 0, &regs);
> +	ret = of_address_to_resource(np, 0, &port->regs);
>  	if (ret)
>  		return (void __iomem *)ERR_PTR(ret);
>  
> -	return devm_ioremap_resource(&pdev->dev, &regs);
> +	return devm_ioremap_resource(&pdev->dev, &port->regs);
>  }
>  
>  #define DT_FLAGS_TO_TYPE(flags)       (((flags) >> 24) & 0x03)


-- 
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