Re: [PATCH v3 4/5] PCI: designware: enhance dw core driver to support Keystone PCI host controller

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On 06/30/2014 05:45 PM, Murali Karicheri wrote:
Add API dw_pcie_v3_65_host_init() to support host controller initialization
for Keystone PCI driver. The Keystone PCI uses v3.65 version of the DW hardware
identified by compatibility string "dw,snps-pcie-v3.65". This allow for
different treatment for this version of the h/w during host initialization.
Key differences in v3.65 DW h/w are
	1. No ATU support
	2. Legacy and MSI irq functions are implemented in application
	   register space
	3. MSI interrupts are multiplexed over 8 IRQ lines to the Host side.
So a msi irq chip is needed and the irq domain ops ptr is passed in
dw_pcie_v3_65_host_init() to allow re-use of common MSI code in dw core.  The
Keystone PCI host controller requires a modified pci scan function to allow
setup BAR0 for EP's access to MSI_IRQ register in application register to
raise MSI irq.  So a ptr to pci hw ops struct is passed to the host init code.

Keystone PCI controller re-uses the DW Core driver code wherever there is
common functionality. So this patch makes these functions global and added
their prototypes in pcie-designware.h to allow re-use on Keystone.

Signed-off-by: Murali Karicheri<m-karicheri2@xxxxxx>

CC: Santosh Shilimkar<santosh.shilimkar@xxxxxx>
CC: Russell King<linux@xxxxxxxxxxxxxxxx>
CC: Grant Likely<grant.likely@xxxxxxxxxx>
CC: Rob Herring<robh+dt@xxxxxxxxxx>
CC: Mohit Kumar<mohit.kumar@xxxxxx>
CC: Jingoo Han<jg1.han@xxxxxxxxxxx>
CC: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
CC: Pratyush Anand<pratyush.anand@xxxxxx>
CC: Richard Zhu<r65037@xxxxxxxxxxxxx>
CC: Kishon Vijay Abraham I<kishon@xxxxxx>
CC: Marek Vasut<marex@xxxxxxx>
CC: Arnd Bergmann<arnd@xxxxxxxx>
CC: Pawel Moll<pawel.moll@xxxxxxx>
CC: Mark Rutland<mark.rutland@xxxxxxx>
CC: Ian Campbell<ijc+devicetree@xxxxxxxxxxxxxx>
CC: Kumar Gala<galak@xxxxxxxxxxxxxx>
CC: Randy Dunlap<rdunlap@xxxxxxxxxxxxx>
CC: Grant Likely<grant.likely@xxxxxxxxxx>
---
  .../devicetree/bindings/pci/designware-pcie.txt    |    2 +
  drivers/pci/host/pcie-designware.c                 |   39 ++++++++++++++++++--
  drivers/pci/host/pcie-designware.h                 |    7 ++++
  3 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index d0d15ee..0cb10c0 100644
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -2,6 +2,8 @@

  Required properties:
  - compatible: should contain "snps,dw-pcie" to identify the core.
+  Additionally contains "dw,snps-pcie-v3.65" to identify v3.65 version of the DW
+  hardware.
  - #address-cells: set to<3>
  - #size-cells: set to<2>
  - device_type: set to "pci"
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index c11e4de..4dcbebe 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -556,6 +556,37 @@ static int dw_pcie_msi_host_init(struct pcie_port *pp,
  	return 0;
  }

+int __init dw_pcie_v3_65_host_init(struct pcie_port *pp, struct hw_pci *hw,
+				   struct device_node *msi_irqc_np,
+				   const struct irq_domain_ops *msi_irq_ops)
+{
+	int ret = -EINVAL;
+
+	/* check if compatible with v3.65 DW h/w */
+	if (!of_device_is_compatible(pp->dev->of_node, "dw,snps-pcie-v3.65")) {
+		dev_err(pp->dev,
+			"PCI Controller not compatible with v3.65 DW h/w\n");
+		goto out;
+	}
+	pp->version = DW_HW_V3_65;
+
+	/* v3.65 PCI controller is expected to provide its own PCI h/w ops */
+	if (!hw || !msi_irq_ops) {
+		dev_err(pp->dev,
+			"v3.65 PCI Controllers doesn't provide %s\n",
+			(hw == NULL) ? "PCI hw ops" : "PCI MSI irq domain ops");
+		goto out;
+	}
+
+	ret = dw_pcie_msi_host_init(pp, msi_irqc_np,  msi_irq_ops);
+	if (ret)
+		goto out;
+
+	ret = dw_pcie_common_host_init(pp, hw);
+out:
+	return ret;
+}
+
  int __init dw_pcie_host_init(struct pcie_port *pp)
  {
  	int ret;
@@ -763,7 +794,7 @@ static struct pci_ops dw_pcie_ops = {
  	.write = dw_pcie_wr_conf,
  };

-static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
+int dw_pcie_setup(int nr, struct pci_sys_data *sys)
  {
  	struct pcie_port *pp;

@@ -786,7 +817,7 @@ static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
  	return 1;
  }

-static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
  {
  	struct pci_bus *bus;
  	struct pcie_port *pp = sys_to_pcie(sys);
@@ -803,7 +834,7 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
  	return bus;
  }

-static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  {
  	struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
  	int irq;
@@ -815,7 +846,7 @@ static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  	return irq;
  }

-static void dw_pcie_add_bus(struct pci_bus *bus)
+void dw_pcie_add_bus(struct pci_bus *bus)
  {
  	if (IS_ENABLED(CONFIG_PCI_MSI)) {
  		struct pcie_port *pp = sys_to_pcie(bus->sysdata);
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index db0260f..2681826 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -81,4 +81,11 @@ void dw_pcie_msi_init(struct pcie_port *pp);
  int dw_pcie_link_up(struct pcie_port *pp);
  void dw_pcie_setup_rc(struct pcie_port *pp);
  int dw_pcie_host_init(struct pcie_port *pp);
+int dw_pcie_v3_65_host_init(struct pcie_port *pp, struct hw_pci *hw,
+			   struct device_node *msi_irqc_np,
+			   const struct irq_domain_ops *msi_irq_ops);
+int dw_pcie_setup(int nr, struct pci_sys_data *sys);
+struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys);
+void dw_pcie_add_bus(struct pci_bus *bus);
+int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin);
  #endif /* _PCIE_DESIGNWARE_H */
DT Maintainers,

Could you provide your comments or Ack for the DT update made in this patch?

Thanks

Murali
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