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
  29 #include <soc/tegra/ahb.h>
  30
  31 #define DRV_NAME "tegra-ahb"
  32
  33 #define AHB_ARBITRATION_DISABLE         0x00
  34 #define AHB_ARBITRATION_PRIORITY_CTRL   0x04
  35 #define   AHB_PRIORITY_WEIGHT(x)        (((x) & 0x7) << 29)
  36 #define   PRIORITY_SELECT_USB BIT(6)
  37 #define   PRIORITY_SELECT_USB2 BIT(18)
  38 #define   PRIORITY_SELECT_USB3 BIT(17)
  39
  40 #define AHB_GIZMO_AHB_MEM               0x0c
  41 #define   ENB_FAST_REARBITRATE BIT(2)
  42 #define   DONT_SPLIT_AHB_WR     BIT(7)
  43
  44 #define AHB_GIZMO_APB_DMA               0x10
  45 #define AHB_GIZMO_IDE                   0x18
  46 #define AHB_GIZMO_USB                   0x1c
  47 #define AHB_GIZMO_AHB_XBAR_BRIDGE       0x20
  48 #define AHB_GIZMO_CPU_AHB_BRIDGE        0x24
  49 #define AHB_GIZMO_COP_AHB_BRIDGE        0x28
  50 #define AHB_GIZMO_XBAR_APB_CTLR         0x2c
  51 #define AHB_GIZMO_VCP_AHB_BRIDGE        0x30
  52 #define AHB_GIZMO_NAND                  0x3c
  53 #define AHB_GIZMO_SDMMC4                0x44
  54 #define AHB_GIZMO_XIO                   0x48
  55 #define AHB_GIZMO_BSEV                  0x60
  56 #define AHB_GIZMO_BSEA                  0x70
  57 #define AHB_GIZMO_NOR                   0x74
  58 #define AHB_GIZMO_USB2                  0x78
  59 #define AHB_GIZMO_USB3                  0x7c
  60 #define   IMMEDIATE     BIT(18)
  61
  62 #define AHB_GIZMO_SDMMC1                0x80
  63 #define AHB_GIZMO_SDMMC2                0x84
  64 #define AHB_GIZMO_SDMMC3                0x88
  65 #define AHB_MEM_PREFETCH_CFG_X          0xd8
  66 #define AHB_ARBITRATION_XBAR_CTRL       0xdc
  67 #define AHB_MEM_PREFETCH_CFG3           0xe0
  68 #define AHB_MEM_PREFETCH_CFG4           0xe4
  69 #define AHB_MEM_PREFETCH_CFG1           0xec
  70 #define AHB_MEM_PREFETCH_CFG2           0xf0
  71 #define   PREFETCH_ENB  BIT(31)
  72 #define   MST_ID(x)     (((x) & 0x1f) << 26)
  73 #define   AHBDMA_MST_ID MST_ID(5)
  74 #define   USB_MST_ID    MST_ID(6)
  75 #define   USB2_MST_ID   MST_ID(18)
  76 #define   USB3_MST_ID   MST_ID(17)
  77 #define   ADDR_BNDRY(x) (((x) & 0xf) << 21)
  78 #define   INACTIVITY_TIMEOUT(x) (((x) & 0xffff) << 0)
  79
  80 #define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID    0xf8
  81
  82 #define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
  83
  84 static struct platform_driver tegra_ahb_driver;
  85
  86 static const u32 tegra_ahb_gizmo[] = {
  87         AHB_ARBITRATION_DISABLE,
  88         AHB_ARBITRATION_PRIORITY_CTRL,
  89         AHB_GIZMO_AHB_MEM,
  90         AHB_GIZMO_APB_DMA,
  91         AHB_GIZMO_IDE,
  92         AHB_GIZMO_USB,
  93         AHB_GIZMO_AHB_XBAR_BRIDGE,
  94         AHB_GIZMO_CPU_AHB_BRIDGE,
  95         AHB_GIZMO_COP_AHB_BRIDGE,
  96         AHB_GIZMO_XBAR_APB_CTLR,
  97         AHB_GIZMO_VCP_AHB_BRIDGE,
  98         AHB_GIZMO_NAND,
  99         AHB_GIZMO_SDMMC4,
 100         AHB_GIZMO_XIO,
 101         AHB_GIZMO_BSEV,
 102         AHB_GIZMO_BSEA,
 103         AHB_GIZMO_NOR,
 104         AHB_GIZMO_USB2,
 105         AHB_GIZMO_USB3,
 106         AHB_GIZMO_SDMMC1,
 107         AHB_GIZMO_SDMMC2,
 108         AHB_GIZMO_SDMMC3,
 109         AHB_MEM_PREFETCH_CFG_X,
 110         AHB_ARBITRATION_XBAR_CTRL,
 111         AHB_MEM_PREFETCH_CFG3,
 112         AHB_MEM_PREFETCH_CFG4,
 113         AHB_MEM_PREFETCH_CFG1,
 114         AHB_MEM_PREFETCH_CFG2,
 115         AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
 116 };
 117
 118 struct tegra_ahb {
 119         void __iomem    *regs;
 120         struct device   *dev;
 121         u32             ctx[0];
 122 };
 123
 124 static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
 125 {
 126         return readl(ahb->regs + offset);
 127 }
 128
 129 static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
 130 {
 131         writel(value, ahb->regs + offset);
 132 }
 133
 134 #ifdef CONFIG_TEGRA_IOMMU_SMMU
 135 static int tegra_ahb_match_by_smmu(struct device *dev, void *data)
 136 {
 137         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 138         struct device_node *dn = data;
 139
 140         return (ahb->dev->of_node == dn) ? 1 : 0;
 141 }
 142
 143 int tegra_ahb_enable_smmu(struct device_node *dn)
 144 {
 145         struct device *dev;
 146         u32 val;
 147         struct tegra_ahb *ahb;
 148
 149         dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
 150                                  tegra_ahb_match_by_smmu);
 151         if (!dev)
 152                 return -EPROBE_DEFER;
 153         ahb = dev_get_drvdata(dev);
 154         val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
 155         val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
 156         gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
 157         return 0;
 158 }
 159 EXPORT_SYMBOL(tegra_ahb_enable_smmu);
 160 #endif
 161
 162 #ifdef CONFIG_PM
 163 static int tegra_ahb_suspend(struct device *dev)
 164 {
 165         int i;
 166         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 167
 168         for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
 169                 ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
 170         return 0;
 171 }
 172
 173 static int tegra_ahb_resume(struct device *dev)
 174 {
 175         int i;
 176         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 177
 178         for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
 179                 gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
 180         return 0;
 181 }
 182 #endif
 183
 184 static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
 185                             tegra_ahb_suspend,
 186                             tegra_ahb_resume, NULL);
 187
 188 static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
 189 {
 190         u32 val;
 191
 192         val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
 193         val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
 194         gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);
 195
 196         val = gizmo_readl(ahb, AHB_GIZMO_USB);
 197         val |= IMMEDIATE;
 198         gizmo_writel(ahb, val, AHB_GIZMO_USB);
 199
 200         val = gizmo_readl(ahb, AHB_GIZMO_USB2);
 201         val |= IMMEDIATE;
 202         gizmo_writel(ahb, val, AHB_GIZMO_USB2);
 203
 204         val = gizmo_readl(ahb, AHB_GIZMO_USB3);
 205         val |= IMMEDIATE;
 206         gizmo_writel(ahb, val, AHB_GIZMO_USB3);
 207
 208         val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
 209         val |= PRIORITY_SELECT_USB |
 210                 PRIORITY_SELECT_USB2 |
 211                 PRIORITY_SELECT_USB3 |
 212                 AHB_PRIORITY_WEIGHT(7);
 213         gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);
 214
 215         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
 216         val &= ~MST_ID(~0);
 217         val |= PREFETCH_ENB |
 218                 AHBDMA_MST_ID |
 219                 ADDR_BNDRY(0xc) |
 220                 INACTIVITY_TIMEOUT(0x1000);
 221         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);
 222
 223         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
 224         val &= ~MST_ID(~0);
 225         val |= PREFETCH_ENB |
 226                 USB_MST_ID |
 227                 ADDR_BNDRY(0xc) |
 228                 INACTIVITY_TIMEOUT(0x1000);
 229         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);
 230
 231         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
 232         val &= ~MST_ID(~0);
 233         val |= PREFETCH_ENB |
 234                 USB3_MST_ID |
 235                 ADDR_BNDRY(0xc) |
 236                 INACTIVITY_TIMEOUT(0x1000);
 237         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);
 238
 239         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
 240         val &= ~MST_ID(~0);
 241         val |= PREFETCH_ENB |
 242                 USB2_MST_ID |
 243                 ADDR_BNDRY(0xc) |
 244                 INACTIVITY_TIMEOUT(0x1000);
 245         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
 246 }
 247
 248 static int tegra_ahb_probe(struct platform_device *pdev)
 249 {
 250         struct resource *res;
 251         struct tegra_ahb *ahb;
 252         size_t bytes;
 253
 254         bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
 255         ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
 256         if (!ahb)
 257                 return -ENOMEM;
 258
 259         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 260         ahb->regs = devm_ioremap_resource(&pdev->dev, res);
 261         if (IS_ERR(ahb->regs))
 262                 return PTR_ERR(ahb->regs);
 263
 264         ahb->dev = &pdev->dev;
 265         platform_set_drvdata(pdev, ahb);
 266         tegra_ahb_gizmo_init(ahb);
 267         return 0;
 268 }
 269
 270 static const struct of_device_id tegra_ahb_of_match[] = {
 271         { .compatible = "nvidia,tegra30-ahb", },
 272         { .compatible = "nvidia,tegra20-ahb", },
 273         {},
 274 };
 275
 276 static struct platform_driver tegra_ahb_driver = {
 277         .probe = tegra_ahb_probe,
 278         .driver = {
 279                 .name = DRV_NAME,
 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);