Re: [PATCH v11 2/4] PCI: mediatek: Add new method to get shared pcie-cfg base address and parse node

On Mon, Jul 19, 2021 at 8:59 PM Chuanjia Liu [off-list ref] wrote:

On Mon, 2021-07-19 at 15:34 +0800, Chuanjia Liu wrote:

quoted

For the new dts format, add a new method to get
shared pcie-cfg base address and parse node.

Signed-off-by: Chuanjia Liu <redacted>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/pci/controller/pcie-mediatek.c | 52 +++++++++++++++++++-------
 1 file changed, 39 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 25bee693834f..928e0983a900 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c

@@ -14,6 +14,7 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
 #include <linux/msi.h>
 #include <linux/module.h>
 #include <linux/of_address.h>

@@ -23,6 +24,7 @@
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regmap.h>
 #include <linux/reset.h>

 #include "../pci.h"

@@ -207,6 +209,7 @@ struct mtk_pcie_port {
  * struct mtk_pcie - PCIe host information
  * @dev: pointer to PCIe device
  * @base: IO mapped register base
+ * @cfg: IO mapped register map for PCIe config
  * @free_ck: free-run reference clock
  * @mem: non-prefetchable memory resource
  * @ports: pointer to PCIe port information

@@ -215,6 +218,7 @@ struct mtk_pcie_port {
 struct mtk_pcie {
      struct device *dev;
      void __iomem *base;
+     struct regmap *cfg;
      struct clk *free_ck;

      struct list_head ports;

@@ -650,7 +654,11 @@ static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
              return err;
      }

-     port->irq = platform_get_irq(pdev, port->slot);
+     if (of_find_property(dev->of_node, "interrupt-names", NULL))
+             port->irq = platform_get_irq_byname(pdev, "pcie_irq");
+     else
+             port->irq = platform_get_irq(pdev, port->slot);
+
      if (port->irq < 0)
              return port->irq;

@@ -682,6 +690,10 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
              val |= PCIE_CSR_LTSSM_EN(port->slot) |
                     PCIE_CSR_ASPM_L1_EN(port->slot);
              writel(val, pcie->base + PCIE_SYS_CFG_V2);
+     } else if (pcie->cfg) {
+             val = PCIE_CSR_LTSSM_EN(port->slot) |
+                   PCIE_CSR_ASPM_L1_EN(port->slot);
+             regmap_update_bits(pcie->cfg, PCIE_SYS_CFG_V2, val, val);
      }

      /* Assert all reset signals */

@@ -985,6 +997,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
      struct device *dev = pcie->dev;
      struct platform_device *pdev = to_platform_device(dev);
      struct resource *regs;
+     struct device_node *cfg_node;
      int err;

      /* get shared registers, which are optional */

@@ -995,6 +1008,14 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
                      return PTR_ERR(pcie->base);
      }

+     cfg_node = of_find_compatible_node(NULL, NULL,
+                                        "mediatek,generic-pciecfg");
+     if (cfg_node) {
+             pcie->cfg = syscon_node_to_regmap(cfg_node);
+             if (IS_ERR(pcie->cfg))
+                     return PTR_ERR(pcie->cfg);
+     }
+
      pcie->free_ck = devm_clk_get(dev, "free_ck");
      if (IS_ERR(pcie->free_ck)) {
              if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)

@@ -1027,22 +1048,27 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
      struct device *dev = pcie->dev;
      struct device_node *node = dev->of_node, *child;
      struct mtk_pcie_port *port, *tmp;
-     int err;
+     int err, slot;
+
+     slot = of_get_pci_domain_nr(dev->of_node);
+     if (slot < 0) {
+             for_each_available_child_of_node(node, child) {
+                     err = of_pci_get_devfn(child);
+                     if (err < 0) {
+                             dev_err(dev, "failed to get devfn: %d\n", err);
+                             goto error_put_node;
+                     }

-     for_each_available_child_of_node(node, child) {
-             int slot;
+                     slot = PCI_SLOT(err);

-             err = of_pci_get_devfn(child);
-             if (err < 0) {
-                     dev_err(dev, "failed to parse devfn: %d\n", err);
-                     goto error_put_node;
+                     err = mtk_pcie_parse_port(pcie, child, slot);
+                     if (err)
+                             goto error_put_node;
              }
-
-             slot = PCI_SLOT(err);
-
-             err = mtk_pcie_parse_port(pcie, child, slot);
+     } else {
+             err = mtk_pcie_parse_port(pcie, node, slot);
              if (err)
-                     goto error_put_node;
+                     return err;

Hi，Rob
I changed this in the v9 version:
When the new dts format is used, of_node_get() is not called.
So when mtk_pcie_parse_port fails, of_node_put don't need to be called.
if you still ok for this, I will add R-b in next version.

Yes, and that's small enough change to keep my R-b.

Rob

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