diff mbox series

[v5,2/3] PCI: dwc: Using parent_bus_addr in of_range to eliminate cpu_addr_fixup()

Message ID 20241015-pci_fixup_addr-v5-2-ced556c85270@nxp.com (mailing list archive)
State Superseded
Headers show
Series PCI: dwc: opitimaze RC host pci_fixup_addr() | expand

Commit Message

Frank Li Oct. 15, 2024, 7:17 p.m. UTC 
parent_bus_addr in struct of_range can indicate address information just
ahead of PCIe controller. Most system's bus fabric use 1:1 map between
input and output address. but some hardware like i.MX8QXP doesn't use 1:1
map. See below diagram:

            ┌─────────┐                    ┌────────────┐
 ┌─────┐    │         │ IA: 0x8ff8_0000    │            │
 │ CPU ├───►│   ┌────►├─────────────────┐  │ PCI        │
 └─────┘    │   │     │ IA: 0x8ff0_0000 │  │            │
  CPU Addr  │   │  ┌─►├─────────────┐   │  │ Controller │
0x7ff8_0000─┼───┘  │  │             │   │  │            │
            │      │  │             │   │  │            │   PCI Addr
0x7ff0_0000─┼──────┘  │             │   └──► IOSpace   ─┼────────────►
            │         │             │      │            │    0
0x7000_0000─┼────────►├─────────┐   │      │            │
            └─────────┘         │   └──────► CfgSpace  ─┼────────────►
             BUS Fabric         │          │            │    0
                                │          │            │
                                └──────────► MemSpace  ─┼────────────►
                        IA: 0x8000_0000    │            │  0x8000_0000
                                           └────────────┘

bus@5f000000 {
	compatible = "simple-bus";
	#address-cells = <1>;
	#size-cells = <1>;
	ranges = <0x80000000 0x0 0x70000000 0x10000000>;

	pcie@5f010000 {
		compatible = "fsl,imx8q-pcie";
		reg = <0x5f010000 0x10000>, <0x8ff00000 0x80000>;
		reg-names = "dbi", "config";
		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		bus-range = <0x00 0xff>;
		ranges = <0x81000000 0 0x00000000 0x8ff80000 0 0x00010000>,
			 <0x82000000 0 0x80000000 0x80000000 0 0x0ff00000>;
	...
	};
};

Term internal address (IA) here means the address just before PCIe
controller. After ATU use this IA instead CPU address, cpu_addr_fixup() can
be removed.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Change from v4 to v5
- remove confused 0x5f00_0000 range in sample dts.
- reorder address at above diagram.

Change from v3 to v4
- none

Change from v2 to v3
- %s/cpu_untranslate_addr/parent_bus_addr/g
- update diagram.
- improve commit message.

Change from v1 to v2
- update because patch1 change get untranslate address method.
- add using_dtbus_info in case break back compatibility for exited platform.
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 42 +++++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h      |  8 +++++
 2 files changed, 50 insertions(+)

Comments

Frank Li Oct. 25, 2024, 4:56 p.m. UTC | #1 
On Tue, Oct 15, 2024 at 03:17:18PM -0400, Frank Li wrote:
> parent_bus_addr in struct of_range can indicate address information just
> ahead of PCIe controller. Most system's bus fabric use 1:1 map between
> input and output address. but some hardware like i.MX8QXP doesn't use 1:1
> map. See below diagram:
>
>             ┌─────────┐                    ┌────────────┐
>  ┌─────┐    │         │ IA: 0x8ff8_0000    │            │
>  │ CPU ├───►│   ┌────►├─────────────────┐  │ PCI        │
>  └─────┘    │   │     │ IA: 0x8ff0_0000 │  │            │
>   CPU Addr  │   │  ┌─►├─────────────┐   │  │ Controller │
> 0x7ff8_0000─┼───┘  │  │             │   │  │            │
>             │      │  │             │   │  │            │   PCI Addr
> 0x7ff0_0000─┼──────┘  │             │   └──► IOSpace   ─┼────────────►
>             │         │             │      │            │    0
> 0x7000_0000─┼────────►├─────────┐   │      │            │
>             └─────────┘         │   └──────► CfgSpace  ─┼────────────►
>              BUS Fabric         │          │            │    0
>                                 │          │            │
>                                 └──────────► MemSpace  ─┼────────────►
>                         IA: 0x8000_0000    │            │  0x8000_0000
>                                            └────────────┘
>
> bus@5f000000 {
> 	compatible = "simple-bus";
> 	#address-cells = <1>;
> 	#size-cells = <1>;
> 	ranges = <0x80000000 0x0 0x70000000 0x10000000>;
>
> 	pcie@5f010000 {
> 		compatible = "fsl,imx8q-pcie";
> 		reg = <0x5f010000 0x10000>, <0x8ff00000 0x80000>;
> 		reg-names = "dbi", "config";
> 		#address-cells = <3>;
> 		#size-cells = <2>;
> 		device_type = "pci";
> 		bus-range = <0x00 0xff>;
> 		ranges = <0x81000000 0 0x00000000 0x8ff80000 0 0x00010000>,
> 			 <0x82000000 0 0x80000000 0x80000000 0 0x0ff00000>;
> 	...
> 	};
> };
>
> Term internal address (IA) here means the address just before PCIe
> controller. After ATU use this IA instead CPU address, cpu_addr_fixup() can
> be removed.
>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>

Mani:
	Do you have chance to review dwc and imx6 part?

Frank

> ---
> Change from v4 to v5
> - remove confused 0x5f00_0000 range in sample dts.
> - reorder address at above diagram.
>
> Change from v3 to v4
> - none
>
> Change from v2 to v3
> - %s/cpu_untranslate_addr/parent_bus_addr/g
> - update diagram.
> - improve commit message.
>
> Change from v1 to v2
> - update because patch1 change get untranslate address method.
> - add using_dtbus_info in case break back compatibility for exited platform.
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 42 +++++++++++++++++++++++
>  drivers/pci/controller/dwc/pcie-designware.h      |  8 +++++
>  2 files changed, 50 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 3e41865c72904..823ff42c2e2c9 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -418,6 +418,34 @@ static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
>  	}
>  }
>
> +static int dw_pcie_get_untranslate_addr(struct dw_pcie *pci, resource_size_t pci_addr,
> +					resource_size_t *i_addr)
> +{
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
> +	struct of_range_parser parser;
> +	struct of_range range;
> +	int ret;
> +
> +	if (!pci->using_dtbus_info) {
> +		*i_addr = pci_addr;
> +		return 0;
> +	}
> +
> +	ret = of_range_parser_init(&parser, np);
> +	if (ret)
> +		return ret;
> +
> +	for_each_of_pci_range(&parser, &range) {
> +		if (pci_addr == range.bus_addr) {
> +			*i_addr = range.parent_bus_addr;
> +			break;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> @@ -427,6 +455,7 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  	struct resource_entry *win;
>  	struct pci_host_bridge *bridge;
>  	struct resource *res;
> +	int index;
>  	int ret;
>
>  	raw_spin_lock_init(&pp->lock);
> @@ -440,6 +469,13 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  		pp->cfg0_size = resource_size(res);
>  		pp->cfg0_base = res->start;
>
> +		if (pci->using_dtbus_info) {
> +			index = of_property_match_string(np, "reg-names", "config");
> +			if (index < 0)
> +				return -EINVAL;
> +			of_property_read_reg(np, index, &pp->cfg0_base, NULL);
> +		}
> +
>  		pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
>  		if (IS_ERR(pp->va_cfg0_base))
>  			return PTR_ERR(pp->va_cfg0_base);
> @@ -462,6 +498,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  		pp->io_base = pci_pio_to_address(win->res->start);
>  	}
>
> +	if (dw_pcie_get_untranslate_addr(pci, pp->io_bus_addr, &pp->io_base))
> +		return -ENODEV;
> +
>  	/* Set default bus ops */
>  	bridge->ops = &dw_pcie_ops;
>  	bridge->child_ops = &dw_child_pcie_ops;
> @@ -733,6 +772,9 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
>  		atu.cpu_addr = entry->res->start;
>  		atu.pci_addr = entry->res->start - entry->offset;
>
> +		if (dw_pcie_get_untranslate_addr(pci, atu.pci_addr, &atu.cpu_addr))
> +			return -EINVAL;
> +
>  		/* Adjust iATU size if MSG TLP region was allocated before */
>  		if (pp->msg_res && pp->msg_res->parent == entry->res)
>  			atu.size = resource_size(entry->res) -
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 347ab74ac35aa..f8067393ad35a 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -463,6 +463,14 @@ struct dw_pcie {
>  	struct reset_control_bulk_data	core_rsts[DW_PCIE_NUM_CORE_RSTS];
>  	struct gpio_desc		*pe_rst;
>  	bool			suspended;
> +	/*
> +	 * Use device tree 'ranges' property of bus node instead using
> +	 * cpu_addr_fixup(). Some old platform dts 'ranges' in bus node may not
> +	 * reflect real hardware's behavior. In case break these platform back
> +	 * compatibility, add below flags. Set it true if dts already correct
> +	 * indicate bus fabric address convert.
> +	 */
> +	bool			using_dtbus_info;
>  };
>
>  #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
>
> --
> 2.34.1
>
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 3e41865c72904..823ff42c2e2c9 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -418,6 +418,34 @@  static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
 	}
 }
 
+static int dw_pcie_get_untranslate_addr(struct dw_pcie *pci, resource_size_t pci_addr,
+					resource_size_t *i_addr)
+{
+	struct device *dev = pci->dev;
+	struct device_node *np = dev->of_node;
+	struct of_range_parser parser;
+	struct of_range range;
+	int ret;
+
+	if (!pci->using_dtbus_info) {
+		*i_addr = pci_addr;
+		return 0;
+	}
+
+	ret = of_range_parser_init(&parser, np);
+	if (ret)
+		return ret;
+
+	for_each_of_pci_range(&parser, &range) {
+		if (pci_addr == range.bus_addr) {
+			*i_addr = range.parent_bus_addr;
+			break;
+		}
+	}
+
+	return 0;
+}
+
 int dw_pcie_host_init(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -427,6 +455,7 @@  int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	struct resource_entry *win;
 	struct pci_host_bridge *bridge;
 	struct resource *res;
+	int index;
 	int ret;
 
 	raw_spin_lock_init(&pp->lock);
@@ -440,6 +469,13 @@  int dw_pcie_host_init(struct dw_pcie_rp *pp)
 		pp->cfg0_size = resource_size(res);
 		pp->cfg0_base = res->start;
 
+		if (pci->using_dtbus_info) {
+			index = of_property_match_string(np, "reg-names", "config");
+			if (index < 0)
+				return -EINVAL;
+			of_property_read_reg(np, index, &pp->cfg0_base, NULL);
+		}
+
 		pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
 		if (IS_ERR(pp->va_cfg0_base))
 			return PTR_ERR(pp->va_cfg0_base);
@@ -462,6 +498,9 @@  int dw_pcie_host_init(struct dw_pcie_rp *pp)
 		pp->io_base = pci_pio_to_address(win->res->start);
 	}
 
+	if (dw_pcie_get_untranslate_addr(pci, pp->io_bus_addr, &pp->io_base))
+		return -ENODEV;
+
 	/* Set default bus ops */
 	bridge->ops = &dw_pcie_ops;
 	bridge->child_ops = &dw_child_pcie_ops;
@@ -733,6 +772,9 @@  static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
 		atu.cpu_addr = entry->res->start;
 		atu.pci_addr = entry->res->start - entry->offset;
 
+		if (dw_pcie_get_untranslate_addr(pci, atu.pci_addr, &atu.cpu_addr))
+			return -EINVAL;
+
 		/* Adjust iATU size if MSG TLP region was allocated before */
 		if (pp->msg_res && pp->msg_res->parent == entry->res)
 			atu.size = resource_size(entry->res) -
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 347ab74ac35aa..f8067393ad35a 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -463,6 +463,14 @@  struct dw_pcie {
 	struct reset_control_bulk_data	core_rsts[DW_PCIE_NUM_CORE_RSTS];
 	struct gpio_desc		*pe_rst;
 	bool			suspended;
+	/*
+	 * Use device tree 'ranges' property of bus node instead using
+	 * cpu_addr_fixup(). Some old platform dts 'ranges' in bus node may not
+	 * reflect real hardware's behavior. In case break these platform back
+	 * compatibility, add below flags. Set it true if dts already correct
+	 * indicate bus fabric address convert.
+	 */
+	bool			using_dtbus_info;
 };
 
 #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)