drivers/amba/tegra-ahb.c

   1 /*
   2  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3  * Copyright (C) 2011 Google, Inc.
   4  *
   5  * Author:
   6  *      Jay Cheng <jacheng@nvidia.com>
   7  *      James Wylder <james.wylder@motorola.com>
   8  *      Benoit Goby <benoit@android.com>
   9  *      Colin Cross <ccross@android.com>
  10  *      Hiroshi DOYU <hdoyu@nvidia.com>
  11  *
  12  * This software is licensed under the terms of the GNU General Public
  13  * License version 2, as published by the Free Software Foundation, and
  14  * may be copied, distributed, and modified under those terms.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  */
  22
  23 #include <linux/err.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/io.h>
  28 #include <linux/tegra-ahb.h>
  29
  30 #define DRV_NAME "tegra-ahb"
  31
  32 #define AHB_ARBITRATION_DISABLE         0x00
  33 #define AHB_ARBITRATION_PRIORITY_CTRL   0x04
  34 #define   AHB_PRIORITY_WEIGHT(x)        (((x) & 0x7) << 29)
  35 #define   PRIORITY_SELECT_USB BIT(6)
  36 #define   PRIORITY_SELECT_USB2 BIT(18)
  37 #define   PRIORITY_SELECT_USB3 BIT(17)
  38
  39 #define AHB_GIZMO_AHB_MEM               0x0c
  40 #define   ENB_FAST_REARBITRATE BIT(2)
  41 #define   DONT_SPLIT_AHB_WR     BIT(7)
  42
  43 #define AHB_GIZMO_APB_DMA               0x10
  44 #define AHB_GIZMO_IDE                   0x18
  45 #define AHB_GIZMO_USB                   0x1c
  46 #define AHB_GIZMO_AHB_XBAR_BRIDGE       0x20
  47 #define AHB_GIZMO_CPU_AHB_BRIDGE        0x24
  48 #define AHB_GIZMO_COP_AHB_BRIDGE        0x28
  49 #define AHB_GIZMO_XBAR_APB_CTLR         0x2c
  50 #define AHB_GIZMO_VCP_AHB_BRIDGE        0x30
  51 #define AHB_GIZMO_NAND                  0x3c
  52 #define AHB_GIZMO_SDMMC4                0x44
  53 #define AHB_GIZMO_XIO                   0x48
  54 #define AHB_GIZMO_BSEV                  0x60
  55 #define AHB_GIZMO_BSEA                  0x70
  56 #define AHB_GIZMO_NOR                   0x74
  57 #define AHB_GIZMO_USB2                  0x78
  58 #define AHB_GIZMO_USB3                  0x7c
  59 #define   IMMEDIATE     BIT(18)
  60
  61 #define AHB_GIZMO_SDMMC1                0x80
  62 #define AHB_GIZMO_SDMMC2                0x84
  63 #define AHB_GIZMO_SDMMC3                0x88
  64 #define AHB_MEM_PREFETCH_CFG_X          0xd8
  65 #define AHB_ARBITRATION_XBAR_CTRL       0xdc
  66 #define AHB_MEM_PREFETCH_CFG3           0xe0
  67 #define AHB_MEM_PREFETCH_CFG4           0xe4
  68 #define AHB_MEM_PREFETCH_CFG1           0xec
  69 #define AHB_MEM_PREFETCH_CFG2           0xf0
  70 #define   PREFETCH_ENB  BIT(31)
  71 #define   MST_ID(x)     (((x) & 0x1f) << 26)
  72 #define   AHBDMA_MST_ID MST_ID(5)
  73 #define   USB_MST_ID    MST_ID(6)
  74 #define   USB2_MST_ID   MST_ID(18)
  75 #define   USB3_MST_ID   MST_ID(17)
  76 #define   ADDR_BNDRY(x) (((x) & 0xf) << 21)
  77 #define   INACTIVITY_TIMEOUT(x) (((x) & 0xffff) << 0)
  78
  79 #define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID    0xf8
  80
  81 #define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
  82
  83 static struct platform_driver tegra_ahb_driver;
  84
  85 static const u32 tegra_ahb_gizmo[] = {
  86         AHB_ARBITRATION_DISABLE,
  87         AHB_ARBITRATION_PRIORITY_CTRL,
  88         AHB_GIZMO_AHB_MEM,
  89         AHB_GIZMO_APB_DMA,
  90         AHB_GIZMO_IDE,
  91         AHB_GIZMO_USB,
  92         AHB_GIZMO_AHB_XBAR_BRIDGE,
  93         AHB_GIZMO_CPU_AHB_BRIDGE,
  94         AHB_GIZMO_COP_AHB_BRIDGE,
  95         AHB_GIZMO_XBAR_APB_CTLR,
  96         AHB_GIZMO_VCP_AHB_BRIDGE,
  97         AHB_GIZMO_NAND,
  98         AHB_GIZMO_SDMMC4,
  99         AHB_GIZMO_XIO,
 100         AHB_GIZMO_BSEV,
 101         AHB_GIZMO_BSEA,
 102         AHB_GIZMO_NOR,
 103         AHB_GIZMO_USB2,
 104         AHB_GIZMO_USB3,
 105         AHB_GIZMO_SDMMC1,
 106         AHB_GIZMO_SDMMC2,
 107         AHB_GIZMO_SDMMC3,
 108         AHB_MEM_PREFETCH_CFG_X,
 109         AHB_ARBITRATION_XBAR_CTRL,
 110         AHB_MEM_PREFETCH_CFG3,
 111         AHB_MEM_PREFETCH_CFG4,
 112         AHB_MEM_PREFETCH_CFG1,
 113         AHB_MEM_PREFETCH_CFG2,
 114         AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
 115 };
 116
 117 struct tegra_ahb {
 118         void __iomem    *regs;
 119         struct device   *dev;
 120         u32             ctx[0];
 121 };
 122
 123 static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
 124 {
 125         return readl(ahb->regs + offset);
 126 }
 127
 128 static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
 129 {
 130         writel(value, ahb->regs + offset);
 131 }
 132
 133 #ifdef CONFIG_TEGRA_IOMMU_SMMU
 134 static int tegra_ahb_match_by_smmu(struct device *dev, void *data)
 135 {
 136         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 137         struct device_node *dn = data;
 138
 139         return (ahb->dev->of_node == dn) ? 1 : 0;
 140 }
 141
 142 int tegra_ahb_enable_smmu(struct device_node *dn)
 143 {
 144         struct device *dev;
 145         u32 val;
 146         struct tegra_ahb *ahb;
 147
 148         dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
 149                                  tegra_ahb_match_by_smmu);
 150         if (!dev)
 151                 return -EPROBE_DEFER;
 152         ahb = dev_get_drvdata(dev);
 153         val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
 154         val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
 155         gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
 156         return 0;
 157 }
 158 EXPORT_SYMBOL(tegra_ahb_enable_smmu);
 159 #endif
 160
 161 #ifdef CONFIG_PM
 162 static int tegra_ahb_suspend(struct device *dev)
 163 {
 164         int i;
 165         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 166
 167         for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
 168                 ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
 169         return 0;
 170 }
 171
 172 static int tegra_ahb_resume(struct device *dev)
 173 {
 174         int i;
 175         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 176
 177         for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
 178                 gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
 179         return 0;
 180 }
 181 #endif
 182
 183 static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
 184                             tegra_ahb_suspend,
 185                             tegra_ahb_resume, NULL);
 186
 187 static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
 188 {
 189         u32 val;
 190
 191         val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
 192         val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
 193         gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);
 194
 195         val = gizmo_readl(ahb, AHB_GIZMO_USB);
 196         val |= IMMEDIATE;
 197         gizmo_writel(ahb, val, AHB_GIZMO_USB);
 198
 199         val = gizmo_readl(ahb, AHB_GIZMO_USB2);
 200         val |= IMMEDIATE;
 201         gizmo_writel(ahb, val, AHB_GIZMO_USB2);
 202
 203         val = gizmo_readl(ahb, AHB_GIZMO_USB3);
 204         val |= IMMEDIATE;
 205         gizmo_writel(ahb, val, AHB_GIZMO_USB3);
 206
 207         val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
 208         val |= PRIORITY_SELECT_USB |
 209                 PRIORITY_SELECT_USB2 |
 210                 PRIORITY_SELECT_USB3 |
 211                 AHB_PRIORITY_WEIGHT(7);
 212         gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);
 213
 214         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
 215         val &= ~MST_ID(~0);
 216         val |= PREFETCH_ENB |
 217                 AHBDMA_MST_ID |
 218                 ADDR_BNDRY(0xc) |
 219                 INACTIVITY_TIMEOUT(0x1000);
 220         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);
 221
 222         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
 223         val &= ~MST_ID(~0);
 224         val |= PREFETCH_ENB |
 225                 USB_MST_ID |
 226                 ADDR_BNDRY(0xc) |
 227                 INACTIVITY_TIMEOUT(0x1000);
 228         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);
 229
 230         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
 231         val &= ~MST_ID(~0);
 232         val |= PREFETCH_ENB |
 233                 USB3_MST_ID |
 234                 ADDR_BNDRY(0xc) |
 235                 INACTIVITY_TIMEOUT(0x1000);
 236         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);
 237
 238         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
 239         val &= ~MST_ID(~0);
 240         val |= PREFETCH_ENB |
 241                 USB2_MST_ID |
 242                 ADDR_BNDRY(0xc) |
 243                 INACTIVITY_TIMEOUT(0x1000);
 244         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
 245 }
 246
 247 static int tegra_ahb_probe(struct platform_device *pdev)
 248 {
 249         struct resource *res;
 250         struct tegra_ahb *ahb;
 251         size_t bytes;
 252
 253         bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
 254         ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
 255         if (!ahb)
 256                 return -ENOMEM;
 257
 258         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 259         ahb->regs = devm_ioremap_resource(&pdev->dev, res);
 260         if (IS_ERR(ahb->regs))
 261                 return PTR_ERR(ahb->regs);
 262
 263         ahb->dev = &pdev->dev;
 264         platform_set_drvdata(pdev, ahb);
 265         tegra_ahb_gizmo_init(ahb);
 266         return 0;
 267 }
 268
 269 static const struct of_device_id tegra_ahb_of_match[] = {
 270         { .compatible = "nvidia,tegra30-ahb", },
 271         { .compatible = "nvidia,tegra20-ahb", },
 272         {},
 273 };
 274
 275 static struct platform_driver tegra_ahb_driver = {
 276         .probe = tegra_ahb_probe,
 277         .driver = {
 278                 .name = DRV_NAME,
 279                 .owner = THIS_MODULE,
 280                 .of_match_table = tegra_ahb_of_match,
 281                 .pm = &tegra_ahb_pm,
 282         },
 283 };
 284 module_platform_driver(tegra_ahb_driver);
 285
 286 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
 287 MODULE_DESCRIPTION("Tegra AHB driver");
 288 MODULE_LICENSE("GPL v2");
 289 MODULE_ALIAS("platform:" DRV_NAME);