| Message ID | 20210913182550.264165-5-maz@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: Add support for Apple M1 | expand |
On Mon, Sep 13, 2021, at 20:25, Marc Zyngier wrote: > From: Alyssa Rosenzweig <alyssa@rosenzweig.io> > > Add a minimal driver to bring up the PCIe bus on Apple system-on-chips, > particularly the Apple M1. This driver exposes the internal bus used for > the USB type-A ports, Ethernet, Wi-Fi, and Bluetooth. Bringing up the > radios requires additional drivers beyond what's necessary for PCIe > itself. > > At this stage, nothing is functionnal. > > Co-developed-by: Stan Skowronek <stan@corellium.com> > Signed-off-by: Stan Skowronek <stan@corellium.com> > Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> > Signed-off-by: Marc Zyngier <maz@kernel.org> > Link: https://lore.kernel.org/r/20210816031621.240268-3-alyssa@rosenzweig.io > --- > MAINTAINERS | 7 + > drivers/pci/controller/Kconfig | 12 ++ > drivers/pci/controller/Makefile | 1 + > drivers/pci/controller/pcie-apple.c | 243 ++++++++++++++++++++++++++++ > 4 files changed, 263 insertions(+) > create mode 100644 drivers/pci/controller/pcie-apple.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 813a847e2d64..9905cc48fed9 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1280,6 +1280,13 @@ S: Maintained > F: Documentation/devicetree/bindings/iommu/apple,dart.yaml > F: drivers/iommu/apple-dart.c > > +APPLE PCIE CONTROLLER DRIVER > +M: Alyssa Rosenzweig <alyssa@rosenzweig.io> > +M: Marc Zyngier <maz@kernel.org> > +L: linux-pci@vger.kernel.org > +S: Maintained > +F: drivers/pci/controller/pcie-apple.c > + > APPLE SMC DRIVER > M: Henrik Rydberg <rydberg@bitmath.org> > L: linux-hwmon@vger.kernel.org > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig > index 326f7d13024f..814833a8120d 100644 > --- a/drivers/pci/controller/Kconfig > +++ b/drivers/pci/controller/Kconfig > @@ -312,6 +312,18 @@ config PCIE_HISI_ERR > Say Y here if you want error handling support > for the PCIe controller's errors on HiSilicon HIP SoCs > > +config PCIE_APPLE > + tristate "Apple PCIe controller" > + depends on ARCH_APPLE || COMPILE_TEST > + depends on OF > + depends on PCI_MSI_IRQ_DOMAIN > + help > + Say Y here if you want to enable PCIe controller support on Apple > + system-on-chips, like the Apple M1. This is required for the USB > + type-A ports, Ethernet, Wi-Fi, and Bluetooth. > + > + If unsure, say Y if you have an Apple Silicon system. > + > source "drivers/pci/controller/dwc/Kconfig" > source "drivers/pci/controller/mobiveil/Kconfig" > source "drivers/pci/controller/cadence/Kconfig" > diff --git a/drivers/pci/controller/Makefile > b/drivers/pci/controller/Makefile > index aaf30b3dcc14..f9d40bad932c 100644 > --- a/drivers/pci/controller/Makefile > +++ b/drivers/pci/controller/Makefile > @@ -37,6 +37,7 @@ obj-$(CONFIG_VMD) += vmd.o > obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o > obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o > obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o > +obj-$(CONFIG_PCIE_APPLE) += pcie-apple.o > # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW > obj-y += dwc/ > obj-y += mobiveil/ > diff --git a/drivers/pci/controller/pcie-apple.c > b/drivers/pci/controller/pcie-apple.c > new file mode 100644 > index 000000000000..f3c414950a10 > --- /dev/null > +++ b/drivers/pci/controller/pcie-apple.c > @@ -0,0 +1,243 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * PCIe host bridge driver for Apple system-on-chips. > + * > + * The HW is ECAM compliant, so once the controller is initialized, > + * the driver mostly deals MSI mapping and handling of per-port > + * interrupts (INTx, management and error signals). > + * > + * Initialization requires enabling power and clocks, along with a > + * number of register pokes. > + * > + * Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io> > + * Copyright (C) 2021 Google LLC > + * Copyright (C) 2021 Corellium LLC > + * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org> > + * > + * Author: Alyssa Rosenzweig <alyssa@rosenzweig.io> > + * Author: Marc Zyngier <maz@kernel.org> > + */ > + > [...] > + > +static inline void rmwl(u32 clr, u32 set, void __iomem *addr) > +{ > + writel_relaxed((readl_relaxed(addr) & ~clr) | set, addr); > +} This helper is a bit strange, especially since it's always only used with either clr != 0 or set != 0 but never (clr = 0 and set = 0) afaict. Maybe create two instead for setting and clearing bits? > + > +static int apple_pcie_setup_port(struct apple_pcie *pcie, > + struct device_node *np) > +{ > + struct platform_device *platform = to_platform_device(pcie->dev); > + struct apple_pcie_port *port; > + struct gpio_desc *reset; > + u32 stat, idx; > + int ret; > + > + reset = gpiod_get_from_of_node(np, "reset-gpios", 0, > + GPIOD_OUT_LOW, "#PERST"); > + if (IS_ERR(reset)) > + return PTR_ERR(reset); > + > + port = devm_kzalloc(pcie->dev, sizeof(*port), GFP_KERNEL); > + if (!port) > + return -ENOMEM; > + > + ret = of_property_read_u32_index(np, "reg", 0, &idx); > + if (ret) > + return ret; > + > + /* Use the first reg entry to work out the port index */ > + port->idx = idx >> 11; > + port->pcie = pcie; > + port->np = np; > + > + port->base = devm_platform_ioremap_resource(platform, port->idx + 2); > + if (IS_ERR(port->base)) > + return -ENODEV; > + > + rmwl(0, PORT_APPCLK_EN, port + PORT_APPCLK); > + > + rmwl(0, PORT_PERST_OFF, port->base + PORT_PERST); > + gpiod_set_value(reset, 1); > + > + ret = readl_relaxed_poll_timeout(port->base + PORT_STATUS, stat, > + stat & PORT_STATUS_READY, 100, 250000); > + if (ret < 0) { > + dev_err(pcie->dev, "port %pOF ready wait timeout\n", np); > + return ret; > + } > + > + /* Flush writes and enable the link */ > + dma_wmb(); This is a DMA barrier but there's no DMA you need to order this against here. I think you can just drop it. > + > + writel_relaxed(PORT_LTSSMCTL_START, port->base + PORT_LTSSMCTL); > + > + return 0; > +} > + Sven
On Mon, 13 Sep 2021 21:48:47 +0100, "Sven Peter" <sven@svenpeter.dev> wrote: > > > > On Mon, Sep 13, 2021, at 20:25, Marc Zyngier wrote: > > From: Alyssa Rosenzweig <alyssa@rosenzweig.io> > > > > Add a minimal driver to bring up the PCIe bus on Apple system-on-chips, > > particularly the Apple M1. This driver exposes the internal bus used for > > the USB type-A ports, Ethernet, Wi-Fi, and Bluetooth. Bringing up the > > radios requires additional drivers beyond what's necessary for PCIe > > itself. > > > > At this stage, nothing is functionnal. > > > > Co-developed-by: Stan Skowronek <stan@corellium.com> > > Signed-off-by: Stan Skowronek <stan@corellium.com> > > Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> > > Signed-off-by: Marc Zyngier <maz@kernel.org> > > Link: https://lore.kernel.org/r/20210816031621.240268-3-alyssa@rosenzweig.io > > --- > > MAINTAINERS | 7 + > > drivers/pci/controller/Kconfig | 12 ++ > > drivers/pci/controller/Makefile | 1 + > > drivers/pci/controller/pcie-apple.c | 243 ++++++++++++++++++++++++++++ > > 4 files changed, 263 insertions(+) > > create mode 100644 drivers/pci/controller/pcie-apple.c > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 813a847e2d64..9905cc48fed9 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -1280,6 +1280,13 @@ S: Maintained > > F: Documentation/devicetree/bindings/iommu/apple,dart.yaml > > F: drivers/iommu/apple-dart.c > > > > +APPLE PCIE CONTROLLER DRIVER > > +M: Alyssa Rosenzweig <alyssa@rosenzweig.io> > > +M: Marc Zyngier <maz@kernel.org> > > +L: linux-pci@vger.kernel.org > > +S: Maintained > > +F: drivers/pci/controller/pcie-apple.c > > + > > APPLE SMC DRIVER > > M: Henrik Rydberg <rydberg@bitmath.org> > > L: linux-hwmon@vger.kernel.org > > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig > > index 326f7d13024f..814833a8120d 100644 > > --- a/drivers/pci/controller/Kconfig > > +++ b/drivers/pci/controller/Kconfig > > @@ -312,6 +312,18 @@ config PCIE_HISI_ERR > > Say Y here if you want error handling support > > for the PCIe controller's errors on HiSilicon HIP SoCs > > > > +config PCIE_APPLE > > + tristate "Apple PCIe controller" > > + depends on ARCH_APPLE || COMPILE_TEST > > + depends on OF > > + depends on PCI_MSI_IRQ_DOMAIN > > + help > > + Say Y here if you want to enable PCIe controller support on Apple > > + system-on-chips, like the Apple M1. This is required for the USB > > + type-A ports, Ethernet, Wi-Fi, and Bluetooth. > > + > > + If unsure, say Y if you have an Apple Silicon system. > > + > > source "drivers/pci/controller/dwc/Kconfig" > > source "drivers/pci/controller/mobiveil/Kconfig" > > source "drivers/pci/controller/cadence/Kconfig" > > diff --git a/drivers/pci/controller/Makefile > > b/drivers/pci/controller/Makefile > > index aaf30b3dcc14..f9d40bad932c 100644 > > --- a/drivers/pci/controller/Makefile > > +++ b/drivers/pci/controller/Makefile > > @@ -37,6 +37,7 @@ obj-$(CONFIG_VMD) += vmd.o > > obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o > > obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o > > obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o > > +obj-$(CONFIG_PCIE_APPLE) += pcie-apple.o > > # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW > > obj-y += dwc/ > > obj-y += mobiveil/ > > diff --git a/drivers/pci/controller/pcie-apple.c > > b/drivers/pci/controller/pcie-apple.c > > new file mode 100644 > > index 000000000000..f3c414950a10 > > --- /dev/null > > +++ b/drivers/pci/controller/pcie-apple.c > > @@ -0,0 +1,243 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * PCIe host bridge driver for Apple system-on-chips. > > + * > > + * The HW is ECAM compliant, so once the controller is initialized, > > + * the driver mostly deals MSI mapping and handling of per-port > > + * interrupts (INTx, management and error signals). > > + * > > + * Initialization requires enabling power and clocks, along with a > > + * number of register pokes. > > + * > > + * Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io> > > + * Copyright (C) 2021 Google LLC > > + * Copyright (C) 2021 Corellium LLC > > + * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org> > > + * > > + * Author: Alyssa Rosenzweig <alyssa@rosenzweig.io> > > + * Author: Marc Zyngier <maz@kernel.org> > > + */ > > + > > [...] > > + > > +static inline void rmwl(u32 clr, u32 set, void __iomem *addr) > > +{ > > + writel_relaxed((readl_relaxed(addr) & ~clr) | set, addr); > > +} > > This helper is a bit strange, especially since it's always only used > with either clr != 0 or set != 0 but never (clr = 0 and set = 0) afaict. > Maybe create two instead for setting and clearing bits? That's indeed nicer, and it makes the code more readable. > > > + > > +static int apple_pcie_setup_port(struct apple_pcie *pcie, > > + struct device_node *np) > > +{ > > + struct platform_device *platform = to_platform_device(pcie->dev); > > + struct apple_pcie_port *port; > > + struct gpio_desc *reset; > > + u32 stat, idx; > > + int ret; > > + > > + reset = gpiod_get_from_of_node(np, "reset-gpios", 0, > > + GPIOD_OUT_LOW, "#PERST"); > > + if (IS_ERR(reset)) > > + return PTR_ERR(reset); > > + > > + port = devm_kzalloc(pcie->dev, sizeof(*port), GFP_KERNEL); > > + if (!port) > > + return -ENOMEM; > > + > > + ret = of_property_read_u32_index(np, "reg", 0, &idx); > > + if (ret) > > + return ret; > > + > > + /* Use the first reg entry to work out the port index */ > > + port->idx = idx >> 11; > > + port->pcie = pcie; > > + port->np = np; > > + > > + port->base = devm_platform_ioremap_resource(platform, port->idx + 2); > > + if (IS_ERR(port->base)) > > + return -ENODEV; > > + > > + rmwl(0, PORT_APPCLK_EN, port + PORT_APPCLK); > > + > > + rmwl(0, PORT_PERST_OFF, port->base + PORT_PERST); > > + gpiod_set_value(reset, 1); > > + > > + ret = readl_relaxed_poll_timeout(port->base + PORT_STATUS, stat, > > + stat & PORT_STATUS_READY, 100, 250000); > > + if (ret < 0) { > > + dev_err(pcie->dev, "port %pOF ready wait timeout\n", np); > > + return ret; > > + } > > + > > + /* Flush writes and enable the link */ > > + dma_wmb(); > > This is a DMA barrier but there's no DMA you need to order this against > here. I think you can just drop it. Indeed, this is all MMIO based, and doesn't refer to anything in memory. Barrier gone. Thanks, M. -- Without deviation from the norm, progress is not possible.
On 17/09/2021 18.20, Marc Zyngier wrote: > On Mon, 13 Sep 2021 21:48:47 +0100, >> On Mon, Sep 13, 2021, at 20:25, Marc Zyngier wrote: >>> +static inline void rmwl(u32 clr, u32 set, void __iomem *addr) >>> +{ >>> + writel_relaxed((readl_relaxed(addr) & ~clr) | set, addr); >>> +} >> >> This helper is a bit strange, especially since it's always only used >> with either clr != 0 or set != 0 but never (clr = 0 and set = 0) afaict. >> Maybe create two instead for setting and clearing bits? > > That's indeed nicer, and it makes the code more readable. This seems to be a pattern in Corellium code; the cpufreq code is the same and I honestly found it quite hard to read when used for simple set or clear operations. I find set32/clear32 style helpers much more readable, so it's probably a good idea to make this change any time we upstream stuff derived from their tree. -- Hector Martin (marcan@marcan.st) Public Key: https://mrcn.st/pub
diff --git a/MAINTAINERS b/MAINTAINERS index 813a847e2d64..9905cc48fed9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1280,6 +1280,13 @@ S: Maintained F: Documentation/devicetree/bindings/iommu/apple,dart.yaml F: drivers/iommu/apple-dart.c +APPLE PCIE CONTROLLER DRIVER +M: Alyssa Rosenzweig <alyssa@rosenzweig.io> +M: Marc Zyngier <maz@kernel.org> +L: linux-pci@vger.kernel.org +S: Maintained +F: drivers/pci/controller/pcie-apple.c + APPLE SMC DRIVER M: Henrik Rydberg <rydberg@bitmath.org> L: linux-hwmon@vger.kernel.org diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 326f7d13024f..814833a8120d 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -312,6 +312,18 @@ config PCIE_HISI_ERR Say Y here if you want error handling support for the PCIe controller's errors on HiSilicon HIP SoCs +config PCIE_APPLE + tristate "Apple PCIe controller" + depends on ARCH_APPLE || COMPILE_TEST + depends on OF + depends on PCI_MSI_IRQ_DOMAIN + help + Say Y here if you want to enable PCIe controller support on Apple + system-on-chips, like the Apple M1. This is required for the USB + type-A ports, Ethernet, Wi-Fi, and Bluetooth. + + If unsure, say Y if you have an Apple Silicon system. + source "drivers/pci/controller/dwc/Kconfig" source "drivers/pci/controller/mobiveil/Kconfig" source "drivers/pci/controller/cadence/Kconfig" diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index aaf30b3dcc14..f9d40bad932c 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_VMD) += vmd.o obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o +obj-$(CONFIG_PCIE_APPLE) += pcie-apple.o # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW obj-y += dwc/ obj-y += mobiveil/ diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c new file mode 100644 index 000000000000..f3c414950a10 --- /dev/null +++ b/drivers/pci/controller/pcie-apple.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe host bridge driver for Apple system-on-chips. + * + * The HW is ECAM compliant, so once the controller is initialized, + * the driver mostly deals MSI mapping and handling of per-port + * interrupts (INTx, management and error signals). + * + * Initialization requires enabling power and clocks, along with a + * number of register pokes. + * + * Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io> + * Copyright (C) 2021 Google LLC + * Copyright (C) 2021 Corellium LLC + * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org> + * + * Author: Alyssa Rosenzweig <alyssa@rosenzweig.io> + * Author: Marc Zyngier <maz@kernel.org> + */ + +#include <linux/gpio/consumer.h> +#include <linux/kernel.h> +#include <linux/iopoll.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/msi.h> +#include <linux/of_irq.h> +#include <linux/pci-ecam.h> + +#define CORE_RC_PHYIF_CTL 0x00024 +#define CORE_RC_PHYIF_CTL_RUN BIT(0) +#define CORE_RC_PHYIF_STAT 0x00028 +#define CORE_RC_PHYIF_STAT_REFCLK BIT(4) +#define CORE_RC_CTL 0x00050 +#define CORE_RC_CTL_RUN BIT(0) +#define CORE_RC_STAT 0x00058 +#define CORE_RC_STAT_READY BIT(0) +#define CORE_FABRIC_STAT 0x04000 +#define CORE_FABRIC_STAT_MASK 0x001F001F +#define CORE_LANE_CFG(port) (0x84000 + 0x4000 * (port)) +#define CORE_LANE_CFG_REFCLK0REQ BIT(0) +#define CORE_LANE_CFG_REFCLK1 BIT(1) +#define CORE_LANE_CFG_REFCLK0ACK BIT(2) +#define CORE_LANE_CFG_REFCLKEN (BIT(9) | BIT(10)) +#define CORE_LANE_CTL(port) (0x84004 + 0x4000 * (port)) +#define CORE_LANE_CTL_CFGACC BIT(15) + +#define PORT_LTSSMCTL 0x00080 +#define PORT_LTSSMCTL_START BIT(0) +#define PORT_INTSTAT 0x00100 +#define PORT_INT_TUNNEL_ERR 31 +#define PORT_INT_CPL_TIMEOUT 23 +#define PORT_INT_RID2SID_MAPERR 22 +#define PORT_INT_CPL_ABORT 21 +#define PORT_INT_MSI_BAD_DATA 19 +#define PORT_INT_MSI_ERR 18 +#define PORT_INT_REQADDR_GT32 17 +#define PORT_INT_AF_TIMEOUT 15 +#define PORT_INT_LINK_DOWN 14 +#define PORT_INT_LINK_UP 12 +#define PORT_INT_LINK_BWMGMT 11 +#define PORT_INT_AER_MASK (15 << 4) +#define PORT_INT_PORT_ERR 4 +#define PORT_INT_INTx(i) i +#define PORT_INT_INTx_MASK 15 +#define PORT_INTMSK 0x00104 +#define PORT_INTMSKSET 0x00108 +#define PORT_INTMSKCLR 0x0010c +#define PORT_MSICFG 0x00124 +#define PORT_MSICFG_EN BIT(0) +#define PORT_MSICFG_L2MSINUM_SHIFT 4 +#define PORT_MSIBASE 0x00128 +#define PORT_MSIBASE_1_SHIFT 16 +#define PORT_MSIADDR 0x00168 +#define PORT_LINKSTS 0x00208 +#define PORT_LINKSTS_UP BIT(0) +#define PORT_LINKSTS_BUSY BIT(2) +#define PORT_LINKCMDSTS 0x00210 +#define PORT_OUTS_NPREQS 0x00284 +#define PORT_OUTS_NPREQS_REQ BIT(24) +#define PORT_OUTS_NPREQS_CPL BIT(16) +#define PORT_RXWR_FIFO 0x00288 +#define PORT_RXWR_FIFO_HDR GENMASK(15, 10) +#define PORT_RXWR_FIFO_DATA GENMASK(9, 0) +#define PORT_RXRD_FIFO 0x0028C +#define PORT_RXRD_FIFO_REQ GENMASK(6, 0) +#define PORT_OUTS_CPLS 0x00290 +#define PORT_OUTS_CPLS_SHRD GENMASK(14, 8) +#define PORT_OUTS_CPLS_WAIT GENMASK(6, 0) +#define PORT_APPCLK 0x00800 +#define PORT_APPCLK_EN BIT(0) +#define PORT_APPCLK_CGDIS BIT(8) +#define PORT_STATUS 0x00804 +#define PORT_STATUS_READY BIT(0) +#define PORT_REFCLK 0x00810 +#define PORT_REFCLK_EN BIT(0) +#define PORT_REFCLK_CGDIS BIT(8) +#define PORT_PERST 0x00814 +#define PORT_PERST_OFF BIT(0) +#define PORT_RID2SID(i16) (0x00828 + 4 * (i16)) +#define PORT_RID2SID_VALID BIT(31) +#define PORT_RID2SID_SID_SHIFT 16 +#define PORT_RID2SID_BUS_SHIFT 8 +#define PORT_RID2SID_DEV_SHIFT 3 +#define PORT_RID2SID_FUNC_SHIFT 0 +#define PORT_OUTS_PREQS_HDR 0x00980 +#define PORT_OUTS_PREQS_HDR_MASK GENMASK(9, 0) +#define PORT_OUTS_PREQS_DATA 0x00984 +#define PORT_OUTS_PREQS_DATA_MASK GENMASK(15, 0) +#define PORT_TUNCTRL 0x00988 +#define PORT_TUNCTRL_PERST_ON BIT(0) +#define PORT_TUNCTRL_PERST_ACK_REQ BIT(1) +#define PORT_TUNSTAT 0x0098c +#define PORT_TUNSTAT_PERST_ON BIT(0) +#define PORT_TUNSTAT_PERST_ACK_PEND BIT(1) +#define PORT_PREFMEM_ENABLE 0x00994 + +struct apple_pcie { + struct device *dev; + void __iomem *base; +}; + +struct apple_pcie_port { + struct apple_pcie *pcie; + struct device_node *np; + void __iomem *base; + int idx; +}; + +static inline void rmwl(u32 clr, u32 set, void __iomem *addr) +{ + writel_relaxed((readl_relaxed(addr) & ~clr) | set, addr); +} + +static int apple_pcie_setup_port(struct apple_pcie *pcie, + struct device_node *np) +{ + struct platform_device *platform = to_platform_device(pcie->dev); + struct apple_pcie_port *port; + struct gpio_desc *reset; + u32 stat, idx; + int ret; + + reset = gpiod_get_from_of_node(np, "reset-gpios", 0, + GPIOD_OUT_LOW, "#PERST"); + if (IS_ERR(reset)) + return PTR_ERR(reset); + + port = devm_kzalloc(pcie->dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + ret = of_property_read_u32_index(np, "reg", 0, &idx); + if (ret) + return ret; + + /* Use the first reg entry to work out the port index */ + port->idx = idx >> 11; + port->pcie = pcie; + port->np = np; + + port->base = devm_platform_ioremap_resource(platform, port->idx + 2); + if (IS_ERR(port->base)) + return -ENODEV; + + rmwl(0, PORT_APPCLK_EN, port + PORT_APPCLK); + + rmwl(0, PORT_PERST_OFF, port->base + PORT_PERST); + gpiod_set_value(reset, 1); + + ret = readl_relaxed_poll_timeout(port->base + PORT_STATUS, stat, + stat & PORT_STATUS_READY, 100, 250000); + if (ret < 0) { + dev_err(pcie->dev, "port %pOF ready wait timeout\n", np); + return ret; + } + + /* Flush writes and enable the link */ + dma_wmb(); + + writel_relaxed(PORT_LTSSMCTL_START, port->base + PORT_LTSSMCTL); + + return 0; +} + +static int apple_pcie_init(struct pci_config_window *cfg) +{ + struct device *dev = cfg->parent; + struct platform_device *platform = to_platform_device(dev); + struct device_node *of_port; + struct apple_pcie *pcie; + int ret; + + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); + if (!pcie) + return -ENOMEM; + + pcie->dev = dev; + + mutex_init(&pcie->lock); + + pcie->base = devm_platform_ioremap_resource(platform, 1); + + if (IS_ERR(pcie->base)) + return -ENODEV; + + for_each_child_of_node(dev->of_node, of_port) { + ret = apple_pcie_setup_port(pcie, of_port); + if (ret) { + dev_err(pcie->dev, "Port %pOF setup fail: %d\n", of_port, ret); + return ret; + } + } + + return 0; +} + +static const struct pci_ecam_ops apple_pcie_cfg_ecam_ops = { + .init = apple_pcie_init, + .pci_ops = { + .map_bus = pci_ecam_map_bus, + .read = pci_generic_config_read, + .write = pci_generic_config_write, + } +}; + +static const struct of_device_id apple_pcie_of_match[] = { + { .compatible = "apple,pcie", .data = &apple_pcie_cfg_ecam_ops }, + { } +}; +MODULE_DEVICE_TABLE(of, apple_pcie_of_match); + +static struct platform_driver apple_pcie_driver = { + .probe = pci_host_common_probe, + .driver = { + .name = "pcie-apple", + .of_match_table = apple_pcie_of_match, + .suppress_bind_attrs = true, + }, +}; +module_platform_driver(apple_pcie_driver); + +MODULE_LICENSE("GPL v2");