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

Chuanjia Liu
2021-07-19T07:43:19Z

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

Signed-off-by: Chuanjia Liu <chuanjia.liu@mediatek.com>
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;
}

err = mtk_pcie_subsys_powerup(pcie);
--
2.18.0