diff mbox

[v3,0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

Message ID 20160426173144.GB27803@localhost (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Bjorn Helgaas April 26, 2016, 5:31 p.m. UTC 
On Tue, Apr 26, 2016 at 10:31:44AM +0200, Thomas Petazzoni wrote:
> Hello,
> 
> Here is the third iteration of the PCIe host controller driver needed
> for the ARM64 Marvell Armada 7K/8K platform.
> 
> Changes since v2:
> 
>  - Added Rob Herring's Acked-by on the Device Tree binding patch.
> 
>  - Reworked the PCIe host driver following the suggestion of Bjorn
>    Helgaas: creation of armada8k_add_pcie_port() and
>    armada8k_pcie_establish_link() in order to follow the convention of
>    other Designware based drivers.
> 
> Thanks!
> 
> Thomas
> 
> Thomas Petazzoni (2):
>   dt-bindings: pci: add DT binding for Marvell Armada 7K/8K PCIe
>     controller
>   pci: host: new driver for Marvell Armada 7K/8K PCIe controller
> 
>  .../devicetree/bindings/pci/pci-armada8k.txt       |  38 +++
>  drivers/pci/host/Kconfig                           |  11 +
>  drivers/pci/host/Makefile                          |   1 +
>  drivers/pci/host/pcie-armada8k.c                   | 276 +++++++++++++++++++++
>  4 files changed, 326 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
>  create mode 100644 drivers/pci/host/pcie-armada8k.c

Thanks, Thomas, I applied these to pci/host-armada for v4.7.

I added the tweaks below to use dev_dbg() instead of pr_debug(), use
dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
and fix a typo and remove unused constants.

Bjorn


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Comments

Thomas Petazzoni April 26, 2016, 7:08 p.m. UTC | #1 
Hello,

On Tue, 26 Apr 2016 12:31:44 -0500, Bjorn Helgaas wrote:

> >  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
> >  create mode 100644 drivers/pci/host/pcie-armada8k.c
> 
> Thanks, Thomas, I applied these to pci/host-armada for v4.7.

Thanks!

> I added the tweaks below to use dev_dbg() instead of pr_debug(), use
> dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
> and fix a typo and remove unused constants.

Looks all good, thanks for applying! Just one tiny question below.

>  	/*
>  	 * Interrupts are directly handled by the device driver of the
> -	 * PCI device. However, there are also latched into the PCIe
> +	 * PCI device.  However, they are also latched into the PCIe

Any reason to have two spaces after the dot here?

Thanks again!

Thomas
Bjorn Helgaas April 26, 2016, 9:45 p.m. UTC | #2 
On Tue, Apr 26, 2016 at 09:08:50PM +0200, Thomas Petazzoni wrote:
> Hello,
> 
> On Tue, 26 Apr 2016 12:31:44 -0500, Bjorn Helgaas wrote:
> 
> > >  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
> > >  create mode 100644 drivers/pci/host/pcie-armada8k.c
> > 
> > Thanks, Thomas, I applied these to pci/host-armada for v4.7.
> 
> Thanks!
> 
> > I added the tweaks below to use dev_dbg() instead of pr_debug(), use
> > dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
> > and fix a typo and remove unused constants.
> 
> Looks all good, thanks for applying! Just one tiny question below.
> 
> >  	/*
> >  	 * Interrupts are directly handled by the device driver of the
> > -	 * PCI device. However, there are also latched into the PCIe
> > +	 * PCI device.  However, they are also latched into the PCIe
> 
> Any reason to have two spaces after the dot here?

Only habit because my eighth-grade typing teacher in 1979 did it that
way, and (I think) vim does it that way by default.  Poor reasons,
both, and definitely trumped by consistency with the rest of the file,
which does use a single space in both other instances.  I removed the
extra space :)

Bjorn
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diff mbox

Patch

diff --git a/drivers/pci/host/pcie-armada8k.c b/drivers/pci/host/pcie-armada8k.c
index 7302de2..811ddf8 100644
--- a/drivers/pci/host/pcie-armada8k.c
+++ b/drivers/pci/host/pcie-armada8k.c
@@ -10,8 +10,6 @@ 
  * warranty of any kind, whether express or implied.
  */
 
-#define pr_fmt(fmt) "armada-8k-pcie: " fmt
-
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
@@ -39,8 +37,6 @@  struct armada8k_pcie {
 #define PCIE_APP_LTSSM_EN		BIT(2)
 #define PCIE_DEVICE_TYPE_SHIFT		4
 #define PCIE_DEVICE_TYPE_MASK		0xF
-#define PCIE_DEVICE_TYPE_EP		0x0 /* Endpoint */
-#define PCIE_DEVICE_TYPE_LEP		0x1 /* Legacy endpoint */
 #define PCIE_DEVICE_TYPE_RC		0x4 /* Root complex */
 
 #define PCIE_GLOBAL_STATUS_REG		0x8
@@ -69,14 +65,12 @@  struct armada8k_pcie {
 #define AX_USER_DOMAIN_MASK		0x3
 #define AX_USER_DOMAIN_SHIFT		4
 
-
-
 #define to_armada8k_pcie(x)	container_of(x, struct armada8k_pcie, pp)
 
 static int armada8k_pcie_link_up(struct pcie_port *pp)
 {
-	u32 reg;
 	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
+	u32 reg;
 	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
 
 	reg = readl(pcie->base + PCIE_GLOBAL_STATUS_REG);
@@ -84,7 +78,7 @@  static int armada8k_pcie_link_up(struct pcie_port *pp)
 	if ((reg & mask) == mask)
 		return 1;
 
-	pr_debug("No link detected (Global-Status: 0x%08x).\n", reg);
+	dev_dbg(pp->dev, "No link detected (Global-Status: 0x%08x).\n", reg);
 	return 0;
 }
 
@@ -92,10 +86,9 @@  static void armada8k_pcie_establish_link(struct pcie_port *pp)
 {
 	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
 	void __iomem *base = pcie->base;
-	int timeout = 1000;
 	u32 reg;
 
-	if (!armada8k_pcie_link_up(pp)) {
+	if (!dw_pcie_link_up(pp)) {
 		/* Disable LTSSM state machine to enable configuration */
 		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
 		reg &= ~(PCIE_APP_LTSSM_EN);
@@ -129,7 +122,7 @@  static void armada8k_pcie_establish_link(struct pcie_port *pp)
 	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
 	writel(reg, base + PCIE_GLOBAL_INT_MASK1_REG);
 
-	if (!armada8k_pcie_link_up(pp)) {
+	if (!dw_pcie_link_up(pp)) {
 		/* Configuration done. Start LTSSM */
 		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
 		reg |= PCIE_APP_LTSSM_EN;
@@ -137,14 +130,7 @@  static void armada8k_pcie_establish_link(struct pcie_port *pp)
 	}
 
 	/* Wait until the link becomes active again */
-	while (timeout) {
-		if (armada8k_pcie_link_up(pp))
-			break;
-		msleep(1);
-		timeout--;
-	}
-
-	if (timeout == 0)
+	if (dw_pcie_wait_for_link(pp))
 		dev_err(pp->dev, "Link not up after reconfiguration\n");
 }
 
@@ -163,7 +149,7 @@  static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 
 	/*
 	 * Interrupts are directly handled by the device driver of the
-	 * PCI device. However, there are also latched into the PCIe
+	 * PCI device.  However, they are also latched into the PCIe
 	 * controller, so we simply discard them.
 	 */
 	val = readl(base + PCIE_GLOBAL_INT_CAUSE1_REG);