This series enables the DesignWare based PCIe controller on the rk356x
series of chips.
We drop the fallback to the core driver due to compatibility issues.
We add support for legacy interrupts for cards that lack MSI support
(which is partially broken currently).
We then add the device tree nodes to enable PCIe on the Quartz64 Model
A.
Patch 1 drops the snps,dw,pcie fallback from the dt-binding
Patch 2 adds legacy interrupt support to the driver
Patch 3 adds the device tree binding to the rk356x.dtsi
Patch 4 enables the PCIe controller on the Quartz64-A
Changelog:
v5:
- fix incorrect series (apologies for the v4 spam)
v4:
- drop the ITS modification, poor compatibility is better than
completely broken
v3:
- drop select node from dt-binding
- convert to for_each_set_bit
- convert to generic_handle_domain_irq
- drop unncessary dev_err
- reorder irq_chip items
- change to level_irq
- install the handler after initializing the domain
v2:
- Define PCIE_CLIENT_INTR_STATUS_LEGACY
- Fix PCIE_LEGACY_INT_ENABLE to only enable the RC interrupts
- Add legacy interrupt enable/disable support
*** BLURB HERE ***
Peter Geis (4):
dt-bindings: pci: remove fallback from Rockchip DesignWare binding
PCI: dwc: rockchip: add legacy interrupt support
arm64: dts: rockchip: add rk3568 pcie2x1 controller
arm64: dts: rockchip: enable pcie controller on quartz64-a
.../bindings/pci/rockchip-dw-pcie.yaml | 12 +-
.../boot/dts/rockchip/rk3566-quartz64-a.dts | 34 ++++++
arch/arm64/boot/dts/rockchip/rk356x.dtsi | 55 +++++++++
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 112 +++++++++++++++++-
4 files changed, 200 insertions(+), 13 deletions(-)
--
2.25.1
The snps,dw-pcie binds to a standalone driver.
It is not fully compatible with the Rockchip implementation and causes a
hang if it binds to the device.
Remove this binding as a valid fallback.
Signed-off-by: Peter Geis <[email protected]>
---
.../devicetree/bindings/pci/rockchip-dw-pcie.yaml | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
index 142bbe577763..bc0a9d1db750 100644
--- a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -19,20 +19,10 @@ description: |+
allOf:
- $ref: /schemas/pci/pci-bus.yaml#
-# We need a select here so we don't match all nodes with 'snps,dw-pcie'
-select:
- properties:
- compatible:
- contains:
- const: rockchip,rk3568-pcie
- required:
- - compatible
-
properties:
compatible:
items:
- const: rockchip,rk3568-pcie
- - const: snps,dw-pcie
reg:
items:
@@ -110,7 +100,7 @@ examples:
#size-cells = <2>;
pcie3x2: pcie@fe280000 {
- compatible = "rockchip,rk3568-pcie", "snps,dw-pcie";
+ compatible = "rockchip,rk3568-pcie";
reg = <0x3 0xc0800000 0x0 0x390000>,
<0x0 0xfe280000 0x0 0x10000>,
<0x3 0x80000000 0x0 0x100000>;
--
2.25.1
The legacy interrupts on the rk356x pcie controller are handled by a
single muxed interrupt. Add irq domain support to the pcie-dw-rockchip
driver to support the virtual domain.
Signed-off-by: Peter Geis <[email protected]>
---
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 112 +++++++++++++++++-
1 file changed, 110 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index c9b341e55cbb..863374604fb1 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -10,9 +10,12 @@
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/of_irq.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
@@ -36,10 +39,13 @@
#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
#define PCIE_L0S_ENTRY 0x11
#define PCIE_CLIENT_GENERAL_CONTROL 0x0
+#define PCIE_CLIENT_INTR_STATUS_LEGACY 0x8
+#define PCIE_CLIENT_INTR_MASK_LEGACY 0x1c
#define PCIE_CLIENT_GENERAL_DEBUG 0x104
-#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
+#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
#define PCIE_CLIENT_LTSSM_STATUS 0x300
-#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
+#define PCIE_LEGACY_INT_ENABLE GENMASK(3, 0)
+#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4)
#define PCIE_LTSSM_STATUS_MASK GENMASK(5, 0)
struct rockchip_pcie {
@@ -51,6 +57,8 @@ struct rockchip_pcie {
struct reset_control *rst;
struct gpio_desc *rst_gpio;
struct regulator *vpcie3v3;
+ struct irq_domain *irq_domain;
+ raw_spinlock_t irq_lock;
};
static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
@@ -65,6 +73,94 @@ static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip,
writel_relaxed(val, rockchip->apb_base + reg);
}
+static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
+ unsigned long reg, hwirq;
+
+ chained_irq_enter(chip, desc);
+
+ reg = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_INTR_STATUS_LEGACY);
+
+ for_each_set_bit(hwirq, ®, 8)
+ generic_handle_domain_irq(rockchip->irq_domain, hwirq);
+
+ chained_irq_exit(chip, desc);
+}
+
+static void rockchip_intx_mask(struct irq_data *data)
+{
+ struct rockchip_pcie *rockchip = irq_data_get_irq_chip_data(data);
+ unsigned long flags;
+ u32 val;
+
+ /* disable legacy interrupts */
+ raw_spin_lock_irqsave(&rockchip->irq_lock, flags);
+ val = HIWORD_UPDATE_BIT(PCIE_LEGACY_INT_ENABLE);
+ val |= PCIE_LEGACY_INT_ENABLE;
+ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_INTR_MASK_LEGACY);
+ raw_spin_unlock_irqrestore(&rockchip->irq_lock, flags);
+};
+
+static void rockchip_intx_unmask(struct irq_data *data)
+{
+ struct rockchip_pcie *rockchip = irq_data_get_irq_chip_data(data);
+ unsigned long flags;
+ u32 val;
+
+ /* enable legacy interrupts */
+ raw_spin_lock_irqsave(&rockchip->irq_lock, flags);
+ val = HIWORD_UPDATE_BIT(PCIE_LEGACY_INT_ENABLE);
+ val &= ~PCIE_LEGACY_INT_ENABLE;
+ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_INTR_MASK_LEGACY);
+ raw_spin_unlock_irqrestore(&rockchip->irq_lock, flags);
+};
+
+static struct irq_chip rockchip_intx_irq_chip = {
+ .name = "INTx",
+ .irq_mask = rockchip_intx_mask,
+ .irq_unmask = rockchip_intx_unmask,
+ .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
+};
+
+static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &rockchip_intx_irq_chip, handle_level_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+ .map = rockchip_pcie_intx_map,
+};
+
+static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
+{
+ struct device *dev = rockchip->pci.dev;
+ struct device_node *intc;
+
+ raw_spin_lock_init(&rockchip->irq_lock);
+
+ intc = of_get_child_by_name(dev->of_node, "legacy-interrupt-controller");
+ if (!intc) {
+ dev_err(dev, "missing child interrupt-controller node\n");
+ return -EINVAL;
+ }
+
+ rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
+ &intx_domain_ops, rockchip);
+ of_node_put(intc);
+ if (!rockchip->irq_domain) {
+ dev_err(dev, "failed to get a INTx IRQ domain\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
{
rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
@@ -111,7 +207,19 @@ static int rockchip_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+ struct device *dev = rockchip->pci.dev;
u32 val = HIWORD_UPDATE_BIT(PCIE_LTSSM_ENABLE_ENHANCE);
+ int irq, ret;
+
+ irq = of_irq_get_byname(dev->of_node, "legacy");
+ if (irq < 0)
+ return irq;
+
+ ret = rockchip_pcie_init_irq_domain(rockchip);
+ if (ret < 0)
+ dev_err(dev, "failed to init irq domain\n");
+
+ irq_set_chained_handler_and_data(irq, rockchip_pcie_legacy_int_handler, rockchip);
/* LTSSM enable control mode */
rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
--
2.25.1