This patch introduces a module that registers and implements a low-level reset function for the AMD XGBE device. it performs the following actions: - reset the PHY - disable auto-negotiation - disable & clear auto-negotiation IRQ - soft-reset the MAC Those tiny pieces of code are inherited from the native xgbe driver. Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx> --- Applies on top of [PATCH v5 0/7] VFIO platform reset module rework v3 -> v4: - add Arnd's R-b v2 -> v3: - in Kconfig, add empty line between the 2 options - remove DRIVER_VERSION, DRIVER_AUTHOR and DRIVER_DESC and put strings directly in MODULE macros v1 -> v2: - uses module_vfio_reset_handler macro --- drivers/vfio/platform/reset/Kconfig | 8 ++ drivers/vfio/platform/reset/Makefile | 2 + .../vfio/platform/reset/vfio_platform_amdxgbe.c | 127 +++++++++++++++++++++ 3 files changed, 137 insertions(+) create mode 100644 drivers/vfio/platform/reset/vfio_platform_amdxgbe.c diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig index 746b96b..70cccc5 100644 --- a/drivers/vfio/platform/reset/Kconfig +++ b/drivers/vfio/platform/reset/Kconfig @@ -5,3 +5,11 @@ config VFIO_PLATFORM_CALXEDAXGMAC_RESET Enables the VFIO platform driver to handle reset for Calxeda xgmac If you don't know what to do here, say N. + +config VFIO_PLATFORM_AMDXGBE_RESET + tristate "VFIO support for AMD XGBE reset" + depends on VFIO_PLATFORM + help + Enables the VFIO platform driver to handle reset for AMD XGBE + + If you don't know what to do here, say N. diff --git a/drivers/vfio/platform/reset/Makefile b/drivers/vfio/platform/reset/Makefile index 2a486af..93f4e23 100644 --- a/drivers/vfio/platform/reset/Makefile +++ b/drivers/vfio/platform/reset/Makefile @@ -1,5 +1,7 @@ vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o +vfio-platform-amdxgbe-y := vfio_platform_amdxgbe.o ccflags-y += -Idrivers/vfio/platform obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o +obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o diff --git a/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c new file mode 100644 index 0000000..1636e22 --- /dev/null +++ b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c @@ -0,0 +1,127 @@ +/* + * VFIO platform driver specialized for AMD xgbe reset + * reset code is inherited from AMD xgbe native driver + * + * Copyright (c) 2015 Linaro Ltd. + * www.linaro.org + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <uapi/linux/mdio.h> +#include <linux/delay.h> + +#include "vfio_platform_private.h" + +#define DMA_MR 0x3000 +#define MAC_VR 0x0110 +#define DMA_ISR 0x3008 +#define MAC_ISR 0x00b0 +#define PCS_MMD_SELECT 0xff +#define MDIO_AN_INT 0x8002 +#define MDIO_AN_INTMASK 0x8001 + +static unsigned int xmdio_read(void *ioaddr, unsigned int mmd, + unsigned int reg) +{ + unsigned int mmd_address, value; + + mmd_address = (mmd << 16) | ((reg) & 0xffff); + iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2)); + value = ioread32(ioaddr + ((mmd_address & 0xff) << 2)); + return value; +} + +static void xmdio_write(void *ioaddr, unsigned int mmd, + unsigned int reg, unsigned int value) +{ + unsigned int mmd_address; + + mmd_address = (mmd << 16) | ((reg) & 0xffff); + iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2)); + iowrite32(value, ioaddr + ((mmd_address & 0xff) << 2)); +} + +int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev) +{ + struct vfio_platform_region xgmac_regs = vdev->regions[0]; + struct vfio_platform_region xpcs_regs = vdev->regions[1]; + u32 dma_mr_value, pcs_value, value; + unsigned int count; + + if (!xgmac_regs.ioaddr) { + xgmac_regs.ioaddr = + ioremap_nocache(xgmac_regs.addr, xgmac_regs.size); + if (!xgmac_regs.ioaddr) + return -ENOMEM; + } + if (!xpcs_regs.ioaddr) { + xpcs_regs.ioaddr = + ioremap_nocache(xpcs_regs.addr, xpcs_regs.size); + if (!xpcs_regs.ioaddr) + return -ENOMEM; + } + + /* reset the PHY through MDIO*/ + pcs_value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_PCS, MDIO_CTRL1); + pcs_value |= MDIO_CTRL1_RESET; + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value); + + count = 50; + do { + msleep(20); + pcs_value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_PCS, + MDIO_CTRL1); + } while ((pcs_value & MDIO_CTRL1_RESET) && --count); + + if (pcs_value & MDIO_CTRL1_RESET) + pr_warn("%s XGBE PHY reset timeout\n", __func__); + + /* disable auto-negotiation */ + value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_CTRL1); + value &= ~MDIO_AN_CTRL1_ENABLE; + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value); + + /* disable AN IRQ */ + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0); + + /* clear AN IRQ */ + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0); + + /* MAC software reset */ + dma_mr_value = ioread32(xgmac_regs.ioaddr + DMA_MR); + dma_mr_value |= 0x1; + iowrite32(dma_mr_value, xgmac_regs.ioaddr + DMA_MR); + + usleep_range(10, 15); + + count = 2000; + while (count-- && (ioread32(xgmac_regs.ioaddr + DMA_MR) & 1)) + usleep_range(500, 600); + + if (!count) + pr_warn("%s MAC SW reset failed\n", __func__); + + return 0; +} + +module_vfio_reset_handler("amd,xgbe-seattle-v1a", vfio_platform_amdxgbe_reset); + +MODULE_VERSION("0.1"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Eric Auger <eric.auger@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Reset support for AMD xgbe vfio platform device"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
