From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754800Ab2INQ12 (ORCPT ); Fri, 14 Sep 2012 12:27:28 -0400 Received: from mail2.gnudd.com ([213.203.150.91]:36478 "EHLO mail.gnudd.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754093Ab2INQ1W (ORCPT ); Fri, 14 Sep 2012 12:27:22 -0400 From: Davide Ciminaghi To: linux@arm.linux.org.uk, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, djbw@fb.com, vinod.koul@intel.com, grant.likely@secretlab.ca, linus.walleij@linaro.org, rubini@gnudd.com, wim@iguana.be, cjb@laptop.org, davidb@codeaurora.org, nico@fluxnic.net, gregkh@linuxfoundation.org, ben-linux@fluff.org, viresh.linux@gmail.com, rajeev-dlh.kumar@st.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, giancarlo.asnaghi@st.com, Alan Cox Subject: [PATCH 7/8] drivers/amba: add support for a PCI bridge Date: Fri, 14 Sep 2012 18:24:02 +0200 Message-Id: <1347639843-32119-8-git-send-email-dciminaghi@mail.gnudd.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1347639843-32119-1-git-send-email-dciminaghi@mail.gnudd.com> References: <1347639843-32119-1-git-send-email-dciminaghi@mail.gnudd.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alessandro Rubini This is a PCI driver that registers AMBA devices for the range of supported devices. It is currently used by STA2X11, which exports AMBA peripherals under PCIe. The original AMBA drivers work with no changes or minimal ones. Signed-off-by: Alessandro Rubini Acked-by: Giancarlo Asnaghi Cc: Russell King Cc: Alan Cox --- drivers/Kconfig | 2 + drivers/amba/Kconfig | 10 +++++ drivers/amba/Makefile | 1 + drivers/amba/pci-amba.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 109 insertions(+), 0 deletions(-) create mode 100644 drivers/amba/Kconfig create mode 100644 drivers/amba/pci-amba.c diff --git a/drivers/Kconfig b/drivers/Kconfig index 324e958..cc549c8 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -154,4 +154,6 @@ source "drivers/vme/Kconfig" source "drivers/pwm/Kconfig" +source "drivers/amba/Kconfig" + endmenu diff --git a/drivers/amba/Kconfig b/drivers/amba/Kconfig new file mode 100644 index 0000000..b5b5aca --- /dev/null +++ b/drivers/amba/Kconfig @@ -0,0 +1,10 @@ + +config PCI_AMBA + tristate "PCI-to-AMBA bridge" + depends on ARM_AMBA && PCI + ---help--- + This compiles a PCI driver that registers AMBA devices, so + the respective AMBA driver can be used unchanged if you have + a PCI to amba bridge. This is required for STA2X11 support. + + If uncertain, choose N. diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile index 66e81c2..d30e947 100644 --- a/drivers/amba/Makefile +++ b/drivers/amba/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_ARM_AMBA) += bus.o +obj-$(CONFIG_PCI_AMBA) += pci-amba.o obj-$(CONFIG_TEGRA_AHB) += tegra-ahb.o diff --git a/drivers/amba/pci-amba.c b/drivers/amba/pci-amba.c new file mode 100644 index 0000000..d7a4049 --- /dev/null +++ b/drivers/amba/pci-amba.c @@ -0,0 +1,96 @@ +/* + * Support for AMBA devices (both APB and AHB) behind a PCI bridge + * Copyright 2012 ST Microelectronics (Alessandro Rubini) + * GNU GPL version 2. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int __devinit pci_amba_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct amba_device *adev; + char *name; + int ret; + + pci_enable_msi(pdev); + ret = pci_enable_device(pdev); + if (ret) + return ret; + + /* Create a name: each of them must be different */ + name = devm_kzalloc(&pdev->dev, strlen(dev_name(&pdev->dev)) + 6, + GFP_KERNEL); + sprintf(name, "amba-%s", dev_name(&pdev->dev)); + + /* Simply build an amba device and register it */ + adev = amba_device_alloc(name, pdev->resource[0].start, SZ_4K); + if (!adev) + return -ENOMEM; + adev->irq[0] = pdev->irq; + + /* This bridge can host both APB and AHB devices, so set master */ + pci_set_master(pdev); + if (pdev->vendor == PCI_VENDOR_ID_STMICRO) { + /* Under sta2x11, DMA is there but limited to 512M */ + adev->dma_mask = SZ_512M - 1; + adev->dev.coherent_dma_mask = SZ_512M - 1; + } + + adev->dev.platform_data = pdev->dev.platform_data; + pci_set_drvdata(pdev, adev); + + ret = amba_device_add(adev, &pdev->resource[0]); + if (ret < 0) + return ret; + return 0; +}; + +static void __devexit pci_amba_remove(struct pci_dev *pdev) +{ + struct amba_device *adev = pci_get_drvdata(pdev); + amba_device_unregister(adev); + pci_disable_msi(pdev); +} + +static DEFINE_PCI_DEVICE_TABLE(pci_amba_table) = { + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_UART_HWFC)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_UART_NO_HWFC)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SOC_DMA)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_I2C)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SPI_HS)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SDIO_EMMC)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SDIO)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_AUDIO_ROUTER_DMA)}, + {PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_AUDIO_ROUTER_MSPS)}, + {0,} +}; + +static struct pci_driver pci_amba_driver = { + .name = "pci-amba", + .id_table = pci_amba_table, + .probe = pci_amba_probe, + .remove = __devexit_p(pci_amba_remove), +}; + +static int __init pci_amba_init(void) +{ + return pci_register_driver(&pci_amba_driver); +} + +static void __exit pci_amba_exit(void) +{ + pci_unregister_driver(&pci_amba_driver); +} + +module_init(pci_amba_init); +module_exit(pci_amba_exit); + +MODULE_LICENSE("GPL"); -- 1.7.9.1