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-rw-r--r--Raspberry-Pi-4-PCIe-support.patch1995
1 files changed, 1995 insertions, 0 deletions
diff --git a/Raspberry-Pi-4-PCIe-support.patch b/Raspberry-Pi-4-PCIe-support.patch
new file mode 100644
index 000000000..d87f6f512
--- /dev/null
+++ b/Raspberry-Pi-4-PCIe-support.patch
@@ -0,0 +1,1995 @@
+From patchwork Mon Dec 16 11:01:07 2019
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+X-Patchwork-Id: 11293801
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+ Mon, 16 Dec 2019 11:01:27 +0000 (UTC)
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+To: andrew.murray@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org,
+ Florian Fainelli <f.fainelli@gmail.com>,
+ bcm-kernel-feedback-list@broadcom.com,
+ Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
+ Bjorn Helgaas <bhelgaas@google.com>
+Subject: [PATCH v5 1/6] dt-bindings: PCI: Add bindings for brcmstb's PCIe
+ device
+Date: Mon, 16 Dec 2019 12:01:07 +0100
+Message-Id: <20191216110113.30436-2-nsaenzjulienne@suse.de>
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+Cc: Mark Rutland <mark.rutland@arm.com>, Rob Herring <robh@kernel.org>,
+ mbrugger@suse.com, devicetree@vger.kernel.org, linux-pci@vger.kernel.org,
+ phil@raspberrypi.org, jeremy.linton@arm.com,
+ Rob Herring <robh+dt@kernel.org>,
+ wahrenst@gmx.net, james.quinlan@broadcom.com,
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+From: Jim Quinlan <james.quinlan@broadcom.com>
+
+The DT bindings description of the brcmstb PCIe device is described.
+This node can only be used for now on the Raspberry Pi 4.
+
+Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
+Co-developed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Reviewed-by: Rob Herring <robh@kernel.org>
+Reviewed-by: Andrew Murray <andrew.murray@arm.com>
+---
+
+Changes since v2:
+ - Add pci reference schema
+ - Drop all default properties
+ - Assume msi-controller and msi-parent are properly defined
+ - Add num entries on multiple properties
+ - use unevaluatedProperties
+ - Update required properties
+ - Fix license
+
+Changes since v1:
+ - Fix commit Subject
+ - Remove linux,pci-domain
+
+This was based on Jim's original submission[1], converted to yaml and
+adapted to the RPi4 case.
+
+[1] https://patchwork.kernel.org/patch/10605937/
+
+ .../bindings/pci/brcm,stb-pcie.yaml | 97 +++++++++++++++++++
+ 1 file changed, 97 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+
+diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+new file mode 100644
+index 000000000000..77d3e81a437b
+--- /dev/null
++++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+@@ -0,0 +1,97 @@
++# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/pci/brcm,stb-pcie.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: Brcmstb PCIe Host Controller Device Tree Bindings
++
++maintainers:
++ - Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
++
++allOf:
++ - $ref: /schemas/pci/pci-bus.yaml#
++
++properties:
++ compatible:
++ const: brcm,bcm2711-pcie # The Raspberry Pi 4
++
++ reg:
++ maxItems: 1
++
++ interrupts:
++ minItems: 1
++ maxItems: 2
++ items:
++ - description: PCIe host controller
++ - description: builtin MSI controller
++
++ interrupt-names:
++ minItems: 1
++ maxItems: 2
++ items:
++ - const: pcie
++ - const: msi
++
++ ranges:
++ maxItems: 1
++
++ dma-ranges:
++ maxItems: 1
++
++ clocks:
++ maxItems: 1
++
++ clock-names:
++ items:
++ - const: sw_pcie
++
++ msi-controller:
++ description: Identifies the node as an MSI controller.
++
++ msi-parent:
++ description: MSI controller the device is capable of using.
++
++ brcm,enable-ssc:
++ description: Indicates usage of spread-spectrum clocking.
++ type: boolean
++
++required:
++ - reg
++ - dma-ranges
++ - "#interrupt-cells"
++ - interrupts
++ - interrupt-names
++ - interrupt-map-mask
++ - interrupt-map
++ - msi-controller
++
++unevaluatedProperties: false
++
++examples:
++ - |
++ #include <dt-bindings/interrupt-controller/irq.h>
++ #include <dt-bindings/interrupt-controller/arm-gic.h>
++
++ scb {
++ #address-cells = <2>;
++ #size-cells = <1>;
++ pcie0: pcie@7d500000 {
++ compatible = "brcm,bcm2711-pcie";
++ reg = <0x0 0x7d500000 0x9310>;
++ device_type = "pci";
++ #address-cells = <3>;
++ #size-cells = <2>;
++ #interrupt-cells = <1>;
++ interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
++ <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
++ interrupt-names = "pcie", "msi";
++ interrupt-map-mask = <0x0 0x0 0x0 0x7>;
++ interrupt-map = <0 0 0 1 &gicv2 GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>;
++ msi-parent = <&pcie0>;
++ msi-controller;
++ ranges = <0x02000000 0x0 0xf8000000 0x6 0x00000000 0x0 0x04000000>;
++ dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>;
++ brcm,enable-ssc;
++ };
++ };
+
+From patchwork Mon Dec 16 11:01:08 2019
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+ Mon, 16 Dec 2019 11:01:27 +0000 (UTC)
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+To: andrew.murray@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org,
+ Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
+ Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Subject: [PATCH v5 2/6] ARM: dts: bcm2711: Enable PCIe controller
+Date: Mon, 16 Dec 2019 12:01:08 +0100
+Message-Id: <20191216110113.30436-3-nsaenzjulienne@suse.de>
+X-Mailer: git-send-email 2.24.0
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+Cc: devicetree@vger.kernel.org, f.fainelli@gmail.com,
+ linux-pci@vger.kernel.org,
+ phil@raspberrypi.org, jeremy.linton@arm.com, mbrugger@suse.com,
+ bcm-kernel-feedback-list@broadcom.com, wahrenst@gmx.net,
+ james.quinlan@broadcom.com, linux-arm-kernel@lists.infradead.org,
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+
+This enables bcm2711's PCIe bus, which is hardwired to a VIA
+Technologies XHCI USB 3.0 controller.
+
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+---
+
+Changes since v4:
+ - Rebase commit taking into account genet support series
+
+Changes since v3:
+ - Remove unwarranted comment
+
+Changes since v2:
+ - Remove unused interrupt-map
+ - correct dma-ranges to it's full size, non power of 2 bus DMA
+ constraints now supported in linux-next[1]
+ - add device_type
+ - rename alias from pcie_0 to pcie0
+
+Changes since v1:
+ - remove linux,pci-domain
+
+[1] https://lkml.org/lkml/2019/11/21/235
+
+ arch/arm/boot/dts/bcm2711.dtsi | 31 ++++++++++++++++++++++++++++++-
+ 1 file changed, 30 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
+index e2f6ffb00aa9..b56388ce1216 100644
+--- a/arch/arm/boot/dts/bcm2711.dtsi
++++ b/arch/arm/boot/dts/bcm2711.dtsi
+@@ -331,7 +331,36 @@ scb {
+ #address-cells = <2>;
+ #size-cells = <1>;
+
+- ranges = <0x0 0x7c000000 0x0 0xfc000000 0x03800000>;
++ ranges = <0x0 0x7c000000 0x0 0xfc000000 0x03800000>,
++ <0x6 0x00000000 0x6 0x00000000 0x40000000>;
++
++ pcie0: pcie@7d500000 {
++ compatible = "brcm,bcm2711-pcie";
++ reg = <0x0 0x7d500000 0x9310>;
++ device_type = "pci";
++ #address-cells = <3>;
++ #interrupt-cells = <1>;
++ #size-cells = <2>;
++ interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
++ <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
++ interrupt-names = "pcie", "msi";
++ interrupt-map-mask = <0x0 0x0 0x0 0x7>;
++ interrupt-map = <0 0 0 1 &gicv2 GIC_SPI 143
++ IRQ_TYPE_LEVEL_HIGH>;
++ msi-controller;
++ msi-parent = <&pcie0>;
++
++ ranges = <0x02000000 0x0 0xf8000000 0x6 0x00000000
++ 0x0 0x04000000>;
++ /*
++ * The wrapper around the PCIe block has a bug
++ * preventing it from accessing beyond the first 3GB of
++ * memory.
++ */
++ dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
++ 0x0 0xc0000000>;
++ brcm,enable-ssc;
++ };
+
+ genet: ethernet@7d580000 {
+ compatible = "brcm,bcm2711-genet-v5";
+
+From patchwork Mon Dec 16 11:01:09 2019
+Content-Type: text/plain; charset="utf-8"
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+X-Patchwork-Id: 11293817
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+ Mon, 16 Dec 2019 11:01:29 +0000 (UTC)
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+To: andrew.murray@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org,
+ Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
+ Florian Fainelli <f.fainelli@gmail.com>,
+ bcm-kernel-feedback-list@broadcom.com,
+ Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Subject: [PATCH v5 3/6] PCI: brcmstb: Add Broadcom STB PCIe host controller
+ driver
+Date: Mon, 16 Dec 2019 12:01:09 +0100
+Message-Id: <20191216110113.30436-4-nsaenzjulienne@suse.de>
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+Cc: mbrugger@suse.com, linux-pci@vger.kernel.org, phil@raspberrypi.org,
+ jeremy.linton@arm.com, wahrenst@gmx.net, james.quinlan@broadcom.com,
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+
+From: Jim Quinlan <james.quinlan@broadcom.com>
+
+This adds a basic driver for Broadcom's STB PCIe controller, for now
+aimed at Raspberry Pi 4's SoC, bcm2711.
+
+Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
+Co-developed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Reviewed-by: Andrew Murray <andrew.murray@arm.com>
+Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
+---
+
+Changes since v3:
+ - Update commit message
+ - rollback roundup_pow_two usage, it'll be updated later down the line
+ - Remove comment in register definition
+
+Changes since v2:
+ - Correct rc_bar2_offset sign
+ - Invert IRQ clear and masking in setup code
+ - Use bitfield.h, redo all register ops while keeping the register
+ names intact
+ - Remove all SHIFT register definitions
+ - Get rid of all _RB writes
+ - Get rid of of_data
+ - Don't iterate over inexisting dma-ranges
+ - Add comment regarding dma-ranges validation
+ - Small cosmetic cleanups
+ - Fix license mismatch
+ - Set driver Kconfig tristate
+ - Didn't add any comment about the controller not being I/O coherent
+ for now as I wait for Jeremy's reply
+
+Changes since v1:
+ - Fix Kconfig
+ - Remove pci domain check
+ - Remove all MSI related code
+ - Remove supend/resume code
+ - Simplify link state wait routine
+ - Prefix all functions
+ - Use of_device_get_match_data()
+ - Use devm_clk_get_optional()
+ - Get rid of irq variable
+ - Use STB all over the driver
+ - Simplify map_bus() function
+ - Fix license mismatch
+ - Remove unused register definitions
+ - Small cleanups, spell errors
+
+This is based on Jim's original submission[1] but adapted and tailored
+specifically to bcm2711's needs (that's the Raspberry Pi 4). Support for
+the rest of the brcmstb family will soon follow once we get support for
+multiple dma-ranges in dma/direct.
+
+[1] https://patchwork.kernel.org/patch/10605959/
+
+ drivers/pci/controller/Kconfig | 8 +
+ drivers/pci/controller/Makefile | 1 +
+ drivers/pci/controller/pcie-brcmstb.c | 748 ++++++++++++++++++++++++++
+ 3 files changed, 757 insertions(+)
+ create mode 100644 drivers/pci/controller/pcie-brcmstb.c
+
+diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
+index c77069c8ee5d..27504f108ee5 100644
+--- a/drivers/pci/controller/Kconfig
++++ b/drivers/pci/controller/Kconfig
+@@ -253,6 +253,14 @@ config VMD
+ To compile this driver as a module, choose M here: the
+ module will be called vmd.
+
++config PCIE_BRCMSTB
++ tristate "Broadcom Brcmstb PCIe host controller"
++ depends on ARCH_BCM2835 || COMPILE_TEST
++ depends on OF
++ help
++ Say Y here to enable PCIe host controller support for
++ Broadcom STB based SoCs, like the Raspberry Pi 4.
++
+ config PCI_HYPERV_INTERFACE
+ tristate "Hyper-V PCI Interface"
+ depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
+diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
+index 3d4f597f15ce..01b2502a5323 100644
+--- a/drivers/pci/controller/Makefile
++++ b/drivers/pci/controller/Makefile
+@@ -28,6 +28,7 @@ obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
+ obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
+ obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
+ obj-$(CONFIG_VMD) += vmd.o
++obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
+ # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
+ obj-y += dwc/
+
+diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
+new file mode 100644
+index 000000000000..dd681164faa0
+--- /dev/null
++++ b/drivers/pci/controller/pcie-brcmstb.c
+@@ -0,0 +1,748 @@
++// SPDX-License-Identifier: GPL-2.0+
++/* Copyright (C) 2009 - 2019 Broadcom */
++
++#include <linux/bitfield.h>
++#include <linux/clk.h>
++#include <linux/compiler.h>
++#include <linux/delay.h>
++#include <linux/init.h>
++#include <linux/interrupt.h>
++#include <linux/io.h>
++#include <linux/ioport.h>
++#include <linux/irqdomain.h>
++#include <linux/kernel.h>
++#include <linux/list.h>
++#include <linux/log2.h>
++#include <linux/module.h>
++#include <linux/of_address.h>
++#include <linux/of_irq.h>
++#include <linux/of_pci.h>
++#include <linux/of_platform.h>
++#include <linux/pci.h>
++#include <linux/printk.h>
++#include <linux/sizes.h>
++#include <linux/slab.h>
++#include <linux/string.h>
++#include <linux/types.h>
++
++#include "../pci.h"
++
++/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
++#define BRCM_PCIE_CAP_REGS 0x00ac
++
++/* Broadcom STB PCIe Register Offsets */
++#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
++#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
++#define PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN 0x0
++
++#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
++#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
++
++#define PCIE_RC_DL_MDIO_ADDR 0x1100
++#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
++#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
++
++#define PCIE_MISC_MISC_CTRL 0x4008
++#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
++#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
++#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
++#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128 0x0
++#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
++
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
++#define PCIE_MEM_WIN0_LO(win) \
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 4)
++
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
++#define PCIE_MEM_WIN0_HI(win) \
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + ((win) * 4)
++
++#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
++#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
++
++#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
++#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
++#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
++
++#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
++#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
++
++#define PCIE_MISC_PCIE_CTRL 0x4064
++#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
++
++#define PCIE_MISC_PCIE_STATUS 0x4068
++#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
++#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
++#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
++#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
++
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
++#define PCIE_MEM_WIN0_BASE_LIMIT(win) \
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT + ((win) * 4)
++
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
++#define PCIE_MEM_WIN0_BASE_HI(win) \
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI + ((win) * 8)
++
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
++#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
++#define PCIE_MEM_WIN0_LIMIT_HI(win) \
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
++
++#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
++#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
++#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
++
++#define PCIE_MSI_INTR2_STATUS 0x4500
++#define PCIE_MSI_INTR2_CLR 0x4508
++#define PCIE_MSI_INTR2_MASK_SET 0x4510
++#define PCIE_MSI_INTR2_MASK_CLR 0x4514
++
++#define PCIE_EXT_CFG_DATA 0x8000
++
++#define PCIE_EXT_CFG_INDEX 0x9000
++#define PCIE_EXT_BUSNUM_SHIFT 20
++#define PCIE_EXT_SLOT_SHIFT 15
++#define PCIE_EXT_FUNC_SHIFT 12
++
++#define PCIE_RGR1_SW_INIT_1 0x9210
++#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
++#define PCIE_RGR1_SW_INIT_1_INIT_MASK 0x2
++
++/* PCIe parameters */
++#define BRCM_NUM_PCIE_OUT_WINS 0x4
++
++/* MDIO registers */
++#define MDIO_PORT0 0x0
++#define MDIO_DATA_MASK 0x7fffffff
++#define MDIO_PORT_MASK 0xf0000
++#define MDIO_REGAD_MASK 0xffff
++#define MDIO_CMD_MASK 0xfff00000
++#define MDIO_CMD_READ 0x1
++#define MDIO_CMD_WRITE 0x0
++#define MDIO_DATA_DONE_MASK 0x80000000
++#define MDIO_RD_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
++#define MDIO_WT_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
++#define SSC_REGS_ADDR 0x1100
++#define SET_ADDR_OFFSET 0x1f
++#define SSC_CNTL_OFFSET 0x2
++#define SSC_CNTL_OVRD_EN_MASK 0x8000
++#define SSC_CNTL_OVRD_VAL_MASK 0x4000
++#define SSC_STATUS_OFFSET 0x1
++#define SSC_STATUS_SSC_MASK 0x400
++#define SSC_STATUS_PLL_LOCK_MASK 0x800
++
++/* Internal PCIe Host Controller Information.*/
++struct brcm_pcie {
++ struct device *dev;
++ void __iomem *base;
++ struct clk *clk;
++ struct pci_bus *root_bus;
++ struct device_node *np;
++ bool ssc;
++ int gen;
++};
++
++/*
++ * This is to convert the size of the inbound "BAR" region to the
++ * non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
++ */
++static int brcm_pcie_encode_ibar_size(u64 size)
++{
++ int log2_in = ilog2(size);
++
++ if (log2_in >= 12 && log2_in <= 15)
++ /* Covers 4KB to 32KB (inclusive) */
++ return (log2_in - 12) + 0x1c;
++ else if (log2_in >= 16 && log2_in <= 35)
++ /* Covers 64KB to 32GB, (inclusive) */
++ return log2_in - 15;
++ /* Something is awry so disable */
++ return 0;
++}
++
++static u32 brcm_pcie_mdio_form_pkt(int port, int regad, int cmd)
++{
++ u32 pkt = 0;
++
++ pkt |= FIELD_PREP(MDIO_PORT_MASK, port);
++ pkt |= FIELD_PREP(MDIO_REGAD_MASK, regad);
++ pkt |= FIELD_PREP(MDIO_CMD_MASK, cmd);
++
++ return pkt;
++}
++
++/* negative return value indicates error */
++static int brcm_pcie_mdio_read(void __iomem *base, u8 port, u8 regad, u32 *val)
++{
++ int tries;
++ u32 data;
++
++ writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_READ),
++ base + PCIE_RC_DL_MDIO_ADDR);
++ readl(base + PCIE_RC_DL_MDIO_ADDR);
++
++ data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
++ for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
++ udelay(10);
++ data = readl(base + PCIE_RC_DL_MDIO_RD_DATA);
++ }
++
++ *val = FIELD_GET(MDIO_DATA_MASK, data);
++ return MDIO_RD_DONE(data) ? 0 : -EIO;
++}
++
++/* negative return value indicates error */
++static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
++ u8 regad, u16 wrdata)
++{
++ int tries;
++ u32 data;
++
++ writel(brcm_pcie_mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
++ base + PCIE_RC_DL_MDIO_ADDR);
++ readl(base + PCIE_RC_DL_MDIO_ADDR);
++ writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
++
++ data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
++ for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
++ udelay(10);
++ data = readl(base + PCIE_RC_DL_MDIO_WR_DATA);
++ }
++
++ return MDIO_WT_DONE(data) ? 0 : -EIO;
++}
++
++/*
++ * Configures device for Spread Spectrum Clocking (SSC) mode; a negative
++ * return value indicates error.
++ */
++static int brcm_pcie_set_ssc(struct brcm_pcie *pcie)
++{
++ int pll, ssc;
++ int ret;
++ u32 tmp;
++
++ ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0, SET_ADDR_OFFSET,
++ SSC_REGS_ADDR);
++ if (ret < 0)
++ return ret;
++
++ ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
++ SSC_CNTL_OFFSET, &tmp);
++ if (ret < 0)
++ return ret;
++
++ u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_EN_MASK);
++ u32p_replace_bits(&tmp, 1, SSC_CNTL_OVRD_VAL_MASK);
++ ret = brcm_pcie_mdio_write(pcie->base, MDIO_PORT0,
++ SSC_CNTL_OFFSET, tmp);
++ if (ret < 0)
++ return ret;
++
++ usleep_range(1000, 2000);
++ ret = brcm_pcie_mdio_read(pcie->base, MDIO_PORT0,
++ SSC_STATUS_OFFSET, &tmp);
++ if (ret < 0)
++ return ret;
++
++ ssc = FIELD_GET(SSC_STATUS_SSC_MASK, tmp);
++ pll = FIELD_GET(SSC_STATUS_PLL_LOCK_MASK, tmp);
++
++ return ssc && pll ? 0 : -EIO;
++}
++
++/* Limits operation to a specific generation (1, 2, or 3) */
++static void brcm_pcie_set_gen(struct brcm_pcie *pcie, int gen)
++{
++ u16 lnkctl2 = readw(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
++ u32 lnkcap = readl(pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
++
++ lnkcap = (lnkcap & ~PCI_EXP_LNKCAP_SLS) | gen;
++ writel(lnkcap, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCAP);
++
++ lnkctl2 = (lnkctl2 & ~0xf) | gen;
++ writew(lnkctl2, pcie->base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKCTL2);
++}
++
++static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
++ unsigned int win, u64 cpu_addr,
++ u64 pcie_addr, u64 size)
++{
++ u32 cpu_addr_mb_high, limit_addr_mb_high;
++ phys_addr_t cpu_addr_mb, limit_addr_mb;
++ int high_addr_shift;
++ u32 tmp;
++
++ /* Set the base of the pcie_addr window */
++ writel(lower_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_LO(win));
++ writel(upper_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_HI(win));
++
++ /* Write the addr base & limit lower bits (in MBs) */
++ cpu_addr_mb = cpu_addr / SZ_1M;
++ limit_addr_mb = (cpu_addr + size - 1) / SZ_1M;
++
++ tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
++ u32p_replace_bits(&tmp, cpu_addr_mb,
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
++ u32p_replace_bits(&tmp, limit_addr_mb,
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
++ writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
++
++ /* Write the cpu & limit addr upper bits */
++ high_addr_shift =
++ HWEIGHT32(PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
++
++ cpu_addr_mb_high = cpu_addr_mb >> high_addr_shift;
++ tmp = readl(pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
++ u32p_replace_bits(&tmp, cpu_addr_mb_high,
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK);
++ writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_HI(win));
++
++ limit_addr_mb_high = limit_addr_mb >> high_addr_shift;
++ tmp = readl(pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
++ u32p_replace_bits(&tmp, limit_addr_mb_high,
++ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK);
++ writel(tmp, pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
++}
++
++/* The controller is capable of serving in both RC and EP roles */
++static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
++{
++ void __iomem *base = pcie->base;
++ u32 val = readl(base + PCIE_MISC_PCIE_STATUS);
++
++ return !!FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK, val);
++}
++
++static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
++{
++ u32 val = readl(pcie->base + PCIE_MISC_PCIE_STATUS);
++ u32 dla = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK, val);
++ u32 plu = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK, val);
++
++ return dla && plu;
++}
++
++/* Configuration space read/write support */
++static inline int brcm_pcie_cfg_index(int busnr, int devfn, int reg)
++{
++ return ((PCI_SLOT(devfn) & 0x1f) << PCIE_EXT_SLOT_SHIFT)
++ | ((PCI_FUNC(devfn) & 0x07) << PCIE_EXT_FUNC_SHIFT)
++ | (busnr << PCIE_EXT_BUSNUM_SHIFT)
++ | (reg & ~3);
++}
++
++static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
++ int where)
++{
++ struct brcm_pcie *pcie = bus->sysdata;
++ void __iomem *base = pcie->base;
++ int idx;
++
++ /* Accesses to the RC go right to the RC registers if slot==0 */
++ if (pci_is_root_bus(bus))
++ return PCI_SLOT(devfn) ? NULL : base + where;
++
++ /* For devices, write to the config space index register */
++ idx = brcm_pcie_cfg_index(bus->number, devfn, 0);
++ writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
++ return base + PCIE_EXT_CFG_DATA + where;
++}
++
++static struct pci_ops brcm_pcie_ops = {
++ .map_bus = brcm_pcie_map_conf,
++ .read = pci_generic_config_read,
++ .write = pci_generic_config_write,
++};
++
++static inline void brcm_pcie_bridge_sw_init_set(struct brcm_pcie *pcie, u32 val)
++{
++ u32 tmp;
++
++ tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
++ u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_INIT_MASK);
++ writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
++}
++
++static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie, u32 val)
++{
++ u32 tmp;
++
++ tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1);
++ u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK);
++ writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1);
++}
++
++static inline int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie,
++ u64 *rc_bar2_size,
++ u64 *rc_bar2_offset)
++{
++ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
++ struct device *dev = pcie->dev;
++ struct resource_entry *entry;
++
++ entry = resource_list_first_type(&bridge->dma_ranges, IORESOURCE_MEM);
++ if (!entry)
++ return -ENODEV;
++
++ *rc_bar2_offset = -entry->offset;
++ *rc_bar2_size = 1ULL << fls64(entry->res->end - entry->res->start);
++
++ /*
++ * We validate the inbound memory view even though we should trust
++ * whatever the device-tree provides. This is because of an HW issue on
++ * early Raspberry Pi 4's revisions (bcm2711). It turns out its
++ * firmware has to dynamically edit dma-ranges due to a bug on the
++ * PCIe controller integration, which prohibits any access above the
++ * lower 3GB of memory. Given this, we decided to keep the dma-ranges
++ * in check, avoiding hard to debug device-tree related issues in the
++ * future:
++ *
++ * The PCIe host controller by design must set the inbound viewport to
++ * be a contiguous arrangement of all of the system's memory. In
++ * addition, its size mut be a power of two. To further complicate
++ * matters, the viewport must start on a pcie-address that is aligned
++ * on a multiple of its size. If a portion of the viewport does not
++ * represent system memory -- e.g. 3GB of memory requires a 4GB
++ * viewport -- we can map the outbound memory in or after 3GB and even
++ * though the viewport will overlap the outbound memory the controller
++ * will know to send outbound memory downstream and everything else
++ * upstream.
++ *
++ * For example:
++ *
++ * - The best-case scenario, memory up to 3GB, is to place the inbound
++ * region in the first 4GB of pcie-space, as some legacy devices can
++ * only address 32bits. We would also like to put the MSI under 4GB
++ * as well, since some devices require a 32bit MSI target address.
++ *
++ * - If the system memory is 4GB or larger we cannot start the inbound
++ * region at location 0 (since we have to allow some space for
++ * outbound memory @ 3GB). So instead it will start at the 1x
++ * multiple of its size
++ */
++ if (!*rc_bar2_size || *rc_bar2_offset % *rc_bar2_size ||
++ (*rc_bar2_offset < SZ_4G && *rc_bar2_offset > SZ_2G)) {
++ dev_err(dev, "Invalid rc_bar2_offset/size: size 0x%llx, off 0x%llx\n",
++ *rc_bar2_size, *rc_bar2_offset);
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++static int brcm_pcie_setup(struct brcm_pcie *pcie)
++{
++ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
++ u64 rc_bar2_offset, rc_bar2_size;
++ void __iomem *base = pcie->base;
++ struct device *dev = pcie->dev;
++ struct resource_entry *entry;
++ unsigned int scb_size_val;
++ bool ssc_good = false;
++ struct resource *res;
++ int num_out_wins = 0;
++ u16 nlw, cls, lnksta;
++ int i, ret;
++ u32 tmp;
++
++ /* Reset the bridge */
++ brcm_pcie_bridge_sw_init_set(pcie, 1);
++
++ usleep_range(100, 200);
++
++ /* Take the bridge out of reset */
++ brcm_pcie_bridge_sw_init_set(pcie, 0);
++
++ tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++ tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
++ writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++ /* Wait for SerDes to be stable */
++ usleep_range(100, 200);
++
++ /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
++ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
++ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
++ u32p_replace_bits(&tmp, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128,
++ PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
++ writel(tmp, base + PCIE_MISC_MISC_CTRL);
++
++ ret = brcm_pcie_get_rc_bar2_size_and_offset(pcie, &rc_bar2_size,
++ &rc_bar2_offset);
++ if (ret)
++ return ret;
++
++ tmp = lower_32_bits(rc_bar2_offset);
++ u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),
++ PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK);
++ writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
++ writel(upper_32_bits(rc_bar2_offset),
++ base + PCIE_MISC_RC_BAR2_CONFIG_HI);
++
++ scb_size_val = rc_bar2_size ?
++ ilog2(rc_bar2_size) - 15 : 0xf; /* 0xf is 1GB */
++ tmp = readl(base + PCIE_MISC_MISC_CTRL);
++ u32p_replace_bits(&tmp, scb_size_val,
++ PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK);
++ writel(tmp, base + PCIE_MISC_MISC_CTRL);
++
++ /* disable the PCIe->GISB memory window (RC_BAR1) */
++ tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
++ tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
++ writel(tmp, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
++
++ /* disable the PCIe->SCB memory window (RC_BAR3) */
++ tmp = readl(base + PCIE_MISC_RC_BAR3_CONFIG_LO);
++ tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
++ writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
++
++ /* Mask all interrupts since we are not handling any yet */
++ writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_MASK_SET);
++
++ /* clear any interrupts we find on boot */
++ writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_CLR);
++
++ if (pcie->gen)
++ brcm_pcie_set_gen(pcie, pcie->gen);
++
++ /* Unassert the fundamental reset */
++ brcm_pcie_perst_set(pcie, 0);
++
++ /*
++ * Give the RC/EP time to wake up, before trying to configure RC.
++ * Intermittently check status for link-up, up to a total of 100ms.
++ */
++ for (i = 0; i < 100 && !brcm_pcie_link_up(pcie); i += 5)
++ msleep(5);
++
++ if (!brcm_pcie_link_up(pcie)) {
++ dev_err(dev, "link down\n");
++ return -ENODEV;
++ }
++
++ if (!brcm_pcie_rc_mode(pcie)) {
++ dev_err(dev, "PCIe misconfigured; is in EP mode\n");
++ return -EINVAL;
++ }
++
++ resource_list_for_each_entry(entry, &bridge->windows) {
++ res = entry->res;
++
++ if (resource_type(res) != IORESOURCE_MEM)
++ continue;
++
++ if (num_out_wins >= BRCM_NUM_PCIE_OUT_WINS) {
++ dev_err(pcie->dev, "too many outbound wins\n");
++ return -EINVAL;
++ }
++
++ brcm_pcie_set_outbound_win(pcie, num_out_wins, res->start,
++ res->start - entry->offset,
++ res->end - res->start + 1);
++ num_out_wins++;
++ }
++
++ /*
++ * For config space accesses on the RC, show the right class for
++ * a PCIe-PCIe bridge (the default setting is to be EP mode).
++ */
++ tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
++ u32p_replace_bits(&tmp, 0x060400,
++ PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
++ writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
++
++ if (pcie->ssc) {
++ ret = brcm_pcie_set_ssc(pcie);
++ if (ret == 0)
++ ssc_good = true;
++ else
++ dev_err(dev, "failed attempt to enter ssc mode\n");
++ }
++
++ lnksta = readw(base + BRCM_PCIE_CAP_REGS + PCI_EXP_LNKSTA);
++ cls = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
++ nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
++ dev_info(dev, "link up, %s x%u %s\n",
++ PCIE_SPEED2STR(cls + PCI_SPEED_133MHz_PCIX_533),
++ nlw, ssc_good ? "(SSC)" : "(!SSC)");
++
++ /* PCIe->SCB endian mode for BAR */
++ tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
++ u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
++ PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK);
++ writel(tmp, base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
++
++ /*
++ * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
++ * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
++ */
++ tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++ tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
++ writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++
++ return 0;
++}
++
++/* L23 is a low-power PCIe link state */
++static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
++{
++ void __iomem *base = pcie->base;
++ int l23, i;
++ u32 tmp;
++
++ /* Assert request for L23 */
++ tmp = readl(base + PCIE_MISC_PCIE_CTRL);
++ u32p_replace_bits(&tmp, 1, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
++ writel(tmp, base + PCIE_MISC_PCIE_CTRL);
++
++ /* Wait up to 36 msec for L23 */
++ tmp = readl(base + PCIE_MISC_PCIE_STATUS);
++ l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK, tmp);
++ for (i = 0; i < 15 && !l23; i++) {
++ usleep_range(2000, 2400);
++ tmp = readl(base + PCIE_MISC_PCIE_STATUS);
++ l23 = FIELD_GET(PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK,
++ tmp);
++ }
++
++ if (!l23)
++ dev_err(pcie->dev, "failed to enter low-power link state\n");
++}
++
++static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
++{
++ void __iomem *base = pcie->base;
++ int tmp;
++
++ if (brcm_pcie_link_up(pcie))
++ brcm_pcie_enter_l23(pcie);
++ /* Assert fundamental reset */
++ brcm_pcie_perst_set(pcie, 1);
++
++ /* Deassert request for L23 in case it was asserted */
++ tmp = readl(base + PCIE_MISC_PCIE_CTRL);
++ u32p_replace_bits(&tmp, 0, PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK);
++ writel(tmp, base + PCIE_MISC_PCIE_CTRL);
++
++ /* Turn off SerDes */
++ tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++ u32p_replace_bits(&tmp, 1, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
++ writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
++
++ /* Shutdown PCIe bridge */
++ brcm_pcie_bridge_sw_init_set(pcie, 1);
++}
++
++static void __brcm_pcie_remove(struct brcm_pcie *pcie)
++{
++ brcm_pcie_turn_off(pcie);
++ clk_disable_unprepare(pcie->clk);
++ clk_put(pcie->clk);
++}
++
++static int brcm_pcie_remove(struct platform_device *pdev)
++{
++ struct brcm_pcie *pcie = platform_get_drvdata(pdev);
++
++ pci_stop_root_bus(pcie->root_bus);
++ pci_remove_root_bus(pcie->root_bus);
++ __brcm_pcie_remove(pcie);
++
++ return 0;
++}
++
++static int brcm_pcie_probe(struct platform_device *pdev)
++{
++ struct device_node *np = pdev->dev.of_node;
++ struct pci_host_bridge *bridge;
++ struct brcm_pcie *pcie;
++ struct pci_bus *child;
++ struct resource *res;
++ int ret;
++
++ bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
++ if (!bridge)
++ return -ENOMEM;
++
++ pcie = pci_host_bridge_priv(bridge);
++ pcie->dev = &pdev->dev;
++ pcie->np = np;
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ pcie->base = devm_ioremap_resource(&pdev->dev, res);
++ if (IS_ERR(pcie->base))
++ return PTR_ERR(pcie->base);
++
++ pcie->clk = devm_clk_get_optional(&pdev->dev, "sw_pcie");
++ if (IS_ERR(pcie->clk))
++ return PTR_ERR(pcie->clk);
++
++ ret = of_pci_get_max_link_speed(np);
++ pcie->gen = (ret < 0) ? 0 : ret;
++
++ pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
++
++ ret = pci_parse_request_of_pci_ranges(pcie->dev, &bridge->windows,
++ &bridge->dma_ranges, NULL);
++ if (ret)
++ return ret;
++
++ ret = clk_prepare_enable(pcie->clk);
++ if (ret) {
++ dev_err(&pdev->dev, "could not enable clock\n");
++ return ret;
++ }
++
++ ret = brcm_pcie_setup(pcie);
++ if (ret)
++ goto fail;
++
++ bridge->dev.parent = &pdev->dev;
++ bridge->busnr = 0;
++ bridge->ops = &brcm_pcie_ops;
++ bridge->sysdata = pcie;
++ bridge->map_irq = of_irq_parse_and_map_pci;
++ bridge->swizzle_irq = pci_common_swizzle;
++
++ ret = pci_scan_root_bus_bridge(bridge);
++ if (ret < 0) {
++ dev_err(pcie->dev, "Scanning root bridge failed\n");
++ goto fail;
++ }
++
++ pci_assign_unassigned_bus_resources(bridge->bus);
++ list_for_each_entry(child, &bridge->bus->children, node)
++ pcie_bus_configure_settings(child);
++ pci_bus_add_devices(bridge->bus);
++ platform_set_drvdata(pdev, pcie);
++ pcie->root_bus = bridge->bus;
++
++ return 0;
++fail:
++ __brcm_pcie_remove(pcie);
++ return ret;
++}
++
++static const struct of_device_id brcm_pcie_match[] = {
++ { .compatible = "brcm,bcm2711-pcie" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, brcm_pcie_match);
++
++static struct platform_driver brcm_pcie_driver = {
++ .probe = brcm_pcie_probe,
++ .remove = brcm_pcie_remove,
++ .driver = {
++ .name = "brcm-pcie",
++ .of_match_table = brcm_pcie_match,
++ },
++};
++module_platform_driver(brcm_pcie_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("Broadcom STB PCIe RC driver");
++MODULE_AUTHOR("Broadcom");
+
+From patchwork Mon Dec 16 11:01:10 2019
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+ Mon, 16 Dec 2019 11:01:30 +0000 (UTC)
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+To: andrew.murray@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org,
+ Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
+ Florian Fainelli <f.fainelli@gmail.com>,
+ bcm-kernel-feedback-list@broadcom.com,
+ Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Subject: [PATCH v5 4/6] PCI: brcmstb: Add MSI support
+Date: Mon, 16 Dec 2019 12:01:10 +0100
+Message-Id: <20191216110113.30436-5-nsaenzjulienne@suse.de>
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+From: Jim Quinlan <james.quinlan@broadcom.com>
+
+This adds MSI support to the Broadcom STB PCIe host controller. The MSI
+controller is physically located within the PCIe block, however, there
+is no reason why the MSI controller could not be moved elsewhere in the
+future. MSIX is not supported by the HW.
+
+Since the internal Brcmstb MSI controller is intertwined with the PCIe
+controller, it is not its own platform device but rather part of the
+PCIe platform device.
+
+Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
+Co-developed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Reviewed-by: Marc Zyngier <maz@kernel.org>
+Reviewed-by: Andrew Murray <andrew.murray@arm.com>
+---
+
+Changes since v3 (kept Marc's reviewed by as changes seem small enough):
+ - Use define to access MSI_DATA_CONFIG_VAL
+ - Update commit message
+
+Changes since v2:
+ - Use standard APIs on register operations
+ - Get rid of revision code
+ - Update rules to msi_target_addr selection
+ - Remove unwarranted MSI_FLAG_PCI_MSIX
+ - Small cosmetic changes
+
+Changes since v1:
+ - Move revision code and some registers to this patch
+ - Use PCIE_MSI_IRQ_DOMAIN in Kconfig
+ - Remove redundant register read from ISR
+ - Fail probe on MSI init error
+ - Get rid of msi_internal
+ - Use bitmap family of functions
+ - Use edge triggered setup
+ - Add comment regarding MultiMSI
+ - Simplify compose_msi_msg to avoid reg read
+
+This is based on Jim's original submission[1] with some slight changes
+regarding how pcie->msi_target_addr is decided.
+
+[1] https://patchwork.kernel.org/patch/10605955/
+
+ drivers/pci/controller/Kconfig | 1 +
+ drivers/pci/controller/pcie-brcmstb.c | 261 +++++++++++++++++++++++++-
+ 2 files changed, 261 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
+index 27504f108ee5..918e283bbff1 100644
+--- a/drivers/pci/controller/Kconfig
++++ b/drivers/pci/controller/Kconfig
+@@ -257,6 +257,7 @@ config PCIE_BRCMSTB
+ tristate "Broadcom Brcmstb PCIe host controller"
+ depends on ARCH_BCM2835 || COMPILE_TEST
+ depends on OF
++ depends on PCI_MSI_IRQ_DOMAIN
+ help
+ Say Y here to enable PCIe host controller support for
+ Broadcom STB based SoCs, like the Raspberry Pi 4.
+diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
+index dd681164faa0..7ba06a0e1a71 100644
+--- a/drivers/pci/controller/pcie-brcmstb.c
++++ b/drivers/pci/controller/pcie-brcmstb.c
+@@ -2,6 +2,7 @@
+ /* Copyright (C) 2009 - 2019 Broadcom */
+
+ #include <linux/bitfield.h>
++#include <linux/bitops.h>
+ #include <linux/clk.h>
+ #include <linux/compiler.h>
+ #include <linux/delay.h>
+@@ -9,11 +10,13 @@
+ #include <linux/interrupt.h>
+ #include <linux/io.h>
+ #include <linux/ioport.h>
++#include <linux/irqchip/chained_irq.h>
+ #include <linux/irqdomain.h>
+ #include <linux/kernel.h>
+ #include <linux/list.h>
+ #include <linux/log2.h>
+ #include <linux/module.h>
++#include <linux/msi.h>
+ #include <linux/of_address.h>
+ #include <linux/of_irq.h>
+ #include <linux/of_pci.h>
+@@ -67,6 +70,12 @@
+ #define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
+ #define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
+
++#define PCIE_MISC_MSI_BAR_CONFIG_LO 0x4044
++#define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
++
++#define PCIE_MISC_MSI_DATA_CONFIG 0x404c
++#define PCIE_MISC_MSI_DATA_CONFIG_VAL 0xffe06540
++
+ #define PCIE_MISC_PCIE_CTRL 0x4064
+ #define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
+
+@@ -114,6 +123,11 @@
+
+ /* PCIe parameters */
+ #define BRCM_NUM_PCIE_OUT_WINS 0x4
++#define BRCM_INT_PCI_MSI_NR 32
++
++/* MSI target adresses */
++#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
++#define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
+
+ /* MDIO registers */
+ #define MDIO_PORT0 0x0
+@@ -135,6 +149,19 @@
+ #define SSC_STATUS_SSC_MASK 0x400
+ #define SSC_STATUS_PLL_LOCK_MASK 0x800
+
++struct brcm_msi {
++ struct device *dev;
++ void __iomem *base;
++ struct device_node *np;
++ struct irq_domain *msi_domain;
++ struct irq_domain *inner_domain;
++ struct mutex lock; /* guards the alloc/free operations */
++ u64 target_addr;
++ int irq;
++ /* used indicates which MSI interrupts have been alloc'd */
++ unsigned long used;
++};
++
+ /* Internal PCIe Host Controller Information.*/
+ struct brcm_pcie {
+ struct device *dev;
+@@ -144,6 +171,8 @@ struct brcm_pcie {
+ struct device_node *np;
+ bool ssc;
+ int gen;
++ u64 msi_target_addr;
++ struct brcm_msi *msi;
+ };
+
+ /*
+@@ -309,6 +338,214 @@ static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
+ writel(tmp, pcie->base + PCIE_MEM_WIN0_LIMIT_HI(win));
+ }
+
++static struct irq_chip brcm_msi_irq_chip = {
++ .name = "BRCM STB PCIe MSI",
++ .irq_ack = irq_chip_ack_parent,
++ .irq_mask = pci_msi_mask_irq,
++ .irq_unmask = pci_msi_unmask_irq,
++};
++
++static struct msi_domain_info brcm_msi_domain_info = {
++ /* Multi MSI is supported by the controller, but not by this driver */
++ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
++ .chip = &brcm_msi_irq_chip,
++};
++
++static void brcm_pcie_msi_isr(struct irq_desc *desc)
++{
++ struct irq_chip *chip = irq_desc_get_chip(desc);
++ unsigned long status, virq;
++ struct brcm_msi *msi;
++ struct device *dev;
++ u32 bit;
++
++ chained_irq_enter(chip, desc);
++ msi = irq_desc_get_handler_data(desc);
++ dev = msi->dev;
++
++ status = readl(msi->base + PCIE_MSI_INTR2_STATUS);
++ for_each_set_bit(bit, &status, BRCM_INT_PCI_MSI_NR) {
++ virq = irq_find_mapping(msi->inner_domain, bit);
++ if (virq)
++ generic_handle_irq(virq);
++ else
++ dev_dbg(dev, "unexpected MSI\n");
++ }
++
++ chained_irq_exit(chip, desc);
++}
++
++static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
++{
++ struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
++
++ msg->address_lo = lower_32_bits(msi->target_addr);
++ msg->address_hi = upper_32_bits(msi->target_addr);
++ msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL) | data->hwirq;
++}
++
++static int brcm_msi_set_affinity(struct irq_data *irq_data,
++ const struct cpumask *mask, bool force)
++{
++ return -EINVAL;
++}
++
++static void brcm_msi_ack_irq(struct irq_data *data)
++{
++ struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
++
++ writel(1 << data->hwirq, msi->base + PCIE_MSI_INTR2_CLR);
++}
++
++
++static struct irq_chip brcm_msi_bottom_irq_chip = {
++ .name = "BRCM STB MSI",
++ .irq_compose_msi_msg = brcm_msi_compose_msi_msg,
++ .irq_set_affinity = brcm_msi_set_affinity,
++ .irq_ack = brcm_msi_ack_irq,
++};
++
++static int brcm_msi_alloc(struct brcm_msi *msi)
++{
++ int hwirq;
++
++ mutex_lock(&msi->lock);
++ hwirq = bitmap_find_free_region(&msi->used, BRCM_INT_PCI_MSI_NR, 0);
++ mutex_unlock(&msi->lock);
++
++ return hwirq;
++}
++
++static void brcm_msi_free(struct brcm_msi *msi, unsigned long hwirq)
++{
++ mutex_lock(&msi->lock);
++ bitmap_release_region(&msi->used, hwirq, 0);
++ mutex_unlock(&msi->lock);
++}
++
++static int brcm_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
++ unsigned int nr_irqs, void *args)
++{
++ struct brcm_msi *msi = domain->host_data;
++ int hwirq;
++
++ hwirq = brcm_msi_alloc(msi);
++
++ if (hwirq < 0)
++ return hwirq;
++
++ irq_domain_set_info(domain, virq, (irq_hw_number_t)hwirq,
++ &brcm_msi_bottom_irq_chip, domain->host_data,
++ handle_edge_irq, NULL, NULL);
++ return 0;
++}
++
++static void brcm_irq_domain_free(struct irq_domain *domain,
++ unsigned int virq, unsigned int nr_irqs)
++{
++ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
++ struct brcm_msi *msi = irq_data_get_irq_chip_data(d);
++
++ brcm_msi_free(msi, d->hwirq);
++}
++
++static const struct irq_domain_ops msi_domain_ops = {
++ .alloc = brcm_irq_domain_alloc,
++ .free = brcm_irq_domain_free,
++};
++
++static int brcm_allocate_domains(struct brcm_msi *msi)
++{
++ struct fwnode_handle *fwnode = of_node_to_fwnode(msi->np);
++ struct device *dev = msi->dev;
++
++ msi->inner_domain = irq_domain_add_linear(NULL, BRCM_INT_PCI_MSI_NR,
++ &msi_domain_ops, msi);
++ if (!msi->inner_domain) {
++ dev_err(dev, "failed to create IRQ domain\n");
++ return -ENOMEM;
++ }
++
++ msi->msi_domain = pci_msi_create_irq_domain(fwnode,
++ &brcm_msi_domain_info,
++ msi->inner_domain);
++ if (!msi->msi_domain) {
++ dev_err(dev, "failed to create MSI domain\n");
++ irq_domain_remove(msi->inner_domain);
++ return -ENOMEM;
++ }
++
++ return 0;
++}
++
++static void brcm_free_domains(struct brcm_msi *msi)
++{
++ irq_domain_remove(msi->msi_domain);
++ irq_domain_remove(msi->inner_domain);
++}
++
++static void brcm_msi_remove(struct brcm_pcie *pcie)
++{
++ struct brcm_msi *msi = pcie->msi;
++
++ if (!msi)
++ return;
++ irq_set_chained_handler(msi->irq, NULL);
++ irq_set_handler_data(msi->irq, NULL);
++ brcm_free_domains(msi);
++}
++
++static void brcm_msi_set_regs(struct brcm_msi *msi)
++{
++ writel(0xffffffff, msi->base + PCIE_MSI_INTR2_MASK_CLR);
++
++ /*
++ * The 0 bit of PCIE_MISC_MSI_BAR_CONFIG_LO is repurposed to MSI
++ * enable, which we set to 1.
++ */
++ writel(lower_32_bits(msi->target_addr) | 0x1,
++ msi->base + PCIE_MISC_MSI_BAR_CONFIG_LO);
++ writel(upper_32_bits(msi->target_addr),
++ msi->base + PCIE_MISC_MSI_BAR_CONFIG_HI);
++
++ writel(PCIE_MISC_MSI_DATA_CONFIG_VAL,
++ msi->base + PCIE_MISC_MSI_DATA_CONFIG);
++}
++
++static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
++{
++ struct brcm_msi *msi;
++ int irq, ret;
++ struct device *dev = pcie->dev;
++
++ irq = irq_of_parse_and_map(dev->of_node, 1);
++ if (irq <= 0) {
++ dev_err(dev, "cannot map MSI interrupt\n");
++ return -ENODEV;
++ }
++
++ msi = devm_kzalloc(dev, sizeof(struct brcm_msi), GFP_KERNEL);
++ if (!msi)
++ return -ENOMEM;
++
++ msi->dev = dev;
++ msi->base = pcie->base;
++ msi->np = pcie->np;
++ msi->target_addr = pcie->msi_target_addr;
++ msi->irq = irq;
++
++ ret = brcm_allocate_domains(msi);
++ if (ret)
++ return ret;
++
++ irq_set_chained_handler_and_data(msi->irq, brcm_pcie_msi_isr, msi);
++
++ brcm_msi_set_regs(msi);
++ pcie->msi = msi;
++
++ return 0;
++}
++
+ /* The controller is capable of serving in both RC and EP roles */
+ static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie)
+ {
+@@ -490,6 +727,18 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
+ PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK);
+ writel(tmp, base + PCIE_MISC_MISC_CTRL);
+
++ /*
++ * We ideally want the MSI target address to be located in the 32bit
++ * addressable memory area. Some devices might depend on it. This is
++ * possible either when the inbound window is located above the lower
++ * 4GB or when the inbound area is smaller than 4GB (taking into
++ * account the rounding-up we're forced to perform).
++ */
++ if (rc_bar2_offset >= SZ_4G || (rc_bar2_size + rc_bar2_offset) < SZ_4G)
++ pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_LT_4GB;
++ else
++ pcie->msi_target_addr = BRCM_MSI_TARGET_ADDR_GT_4GB;
++
+ /* disable the PCIe->GISB memory window (RC_BAR1) */
+ tmp = readl(base + PCIE_MISC_RC_BAR1_CONFIG_LO);
+ tmp &= ~PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK;
+@@ -639,6 +888,7 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
+
+ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
+ {
++ brcm_msi_remove(pcie);
+ brcm_pcie_turn_off(pcie);
+ clk_disable_unprepare(pcie->clk);
+ clk_put(pcie->clk);
+@@ -657,7 +907,7 @@ static int brcm_pcie_remove(struct platform_device *pdev)
+
+ static int brcm_pcie_probe(struct platform_device *pdev)
+ {
+- struct device_node *np = pdev->dev.of_node;
++ struct device_node *np = pdev->dev.of_node, *msi_np;
+ struct pci_host_bridge *bridge;
+ struct brcm_pcie *pcie;
+ struct pci_bus *child;
+@@ -701,6 +951,15 @@ static int brcm_pcie_probe(struct platform_device *pdev)
+ if (ret)
+ goto fail;
+
++ msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
++ if (pci_msi_enabled() && msi_np == pcie->np) {
++ ret = brcm_pcie_enable_msi(pcie);
++ if (ret) {
++ dev_err(pcie->dev, "probe of internal MSI failed");
++ goto fail;
++ }
++ }
++
+ bridge->dev.parent = &pdev->dev;
+ bridge->busnr = 0;
+ bridge->ops = &brcm_pcie_ops;
+
+From patchwork Mon Dec 16 11:01:12 2019
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+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+To: andrew.murray@arm.com,
+ maz@kernel.org,
+ linux-kernel@vger.kernel.org
+Subject: [PATCH v5 6/6] arm64: defconfig: Enable Broadcom's STB PCIe
+ controller
+Date: Mon, 16 Dec 2019 12:01:12 +0100
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+For now mainly used in the Raspberry Pi 4.
+
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+---
+ arch/arm64/configs/defconfig | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
+index 2646fc76b8db..2b80980ef576 100644
+--- a/arch/arm64/configs/defconfig
++++ b/arch/arm64/configs/defconfig
+@@ -192,6 +192,7 @@ CONFIG_PCIE_ALTERA_MSI=y
+ CONFIG_PCI_HOST_THUNDER_PEM=y
+ CONFIG_PCI_HOST_THUNDER_ECAM=y
+ CONFIG_PCIE_ROCKCHIP_HOST=m
++CONFIG_PCIE_BRCMSTB=m
+ CONFIG_PCI_LAYERSCAPE=y
+ CONFIG_PCI_HISI=y
+ CONFIG_PCIE_QCOM=y
generated by cgit (git 2.34.1) at 2024-11-15 20:08:47 +0000