projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 713cc334 EA |
1 | /* |
| 2 | * VFIO platform driver specialized for Calxeda xgmac reset | |
| 3 | * reset code is inherited from calxeda xgmac native driver | |
| 4 | * | |
| 5 | * Copyright 2010-2011 Calxeda, Inc. | |
| 6 | * Copyright (c) 2015 Linaro Ltd. | |
| 7 | * www.linaro.org | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or modify it | |
| 10 | * under the terms and conditions of the GNU General Public License, | |
| 11 | * version 2, as published by the Free Software Foundation. | |
| 12 | * | |
| 13 | * This program is distributed in the hope it will be useful, but WITHOUT | |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 | * more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU General Public License along with | |
| 19 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 | */ | |
| 21 | ||
| 22 | #include <linux/module.h> | |
| 23 | #include <linux/kernel.h> | |
| 24 | #include <linux/init.h> | |
| 25 | #include <linux/io.h> | |
| 26 | ||
| 27 | #include "vfio_platform_private.h" | |
| 28 | ||
| 29 | #define DRIVER_VERSION "0.1" | |
| 30 | #define DRIVER_AUTHOR "Eric Auger <eric.auger@linaro.org>" | |
| 31 | #define DRIVER_DESC "Reset support for Calxeda xgmac vfio platform device" | |
| 32 | ||
| 33 | #define CALXEDAXGMAC_COMPAT "calxeda,hb-xgmac" | |
| 34 | ||
| 35 | /* XGMAC Register definitions */ | |
| 36 | #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */ | |
| 37 | ||
| 38 | /* DMA Control and Status Registers */ | |
| 39 | #define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */ | |
| 40 | #define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */ | |
| 41 | ||
| 42 | /* DMA Control registe defines */ | |
| 43 | #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */ | |
| 44 | #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */ | |
| 45 | ||
| 46 | /* Common MAC defines */ | |
| 47 | #define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */ | |
| 48 | #define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */ | |
| 49 | ||
| 50 | static inline void xgmac_mac_disable(void __iomem *ioaddr) | |
| 51 | { | |
| 52 | u32 value = readl(ioaddr + XGMAC_DMA_CONTROL); | |
| 53 | ||
| 54 | value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR); | |
| 55 | writel(value, ioaddr + XGMAC_DMA_CONTROL); | |
| 56 | ||
| 57 | value = readl(ioaddr + XGMAC_CONTROL); | |
| 58 | value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX); | |
| 59 | writel(value, ioaddr + XGMAC_CONTROL); | |
| 60 | } | |
| 61 | ||
| 62 | int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev) | |
| 63 | { | |
| 64 | struct vfio_platform_region reg = vdev->regions[0]; | |
| 65 | ||
| 66 | if (!reg.ioaddr) { | |
| 67 | reg.ioaddr = | |
| 68 | ioremap_nocache(reg.addr, reg.size); | |
| 69 | if (!reg.ioaddr) | |
| 70 | return -ENOMEM; | |
| 71 | } | |
| 72 | ||
| 73 | /* disable IRQ */ | |
| 74 | writel(0, reg.ioaddr + XGMAC_DMA_INTR_ENA); | |
| 75 | ||
| 76 | /* Disable the MAC core */ | |
| 77 | xgmac_mac_disable(reg.ioaddr); | |
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset); | |
| 82 | ||
| 83 | MODULE_VERSION(DRIVER_VERSION); | |
| 84 | MODULE_LICENSE("GPL v2"); | |
| 85 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
| 86 | MODULE_DESCRIPTION(DRIVER_DESC); |