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/of.h>
  29
  30 #include <soc/tegra/ahb.h>
  31
  32 #define DRV_NAME "tegra-ahb"
  33
  34 #define AHB_ARBITRATION_DISABLE         0x04
  35 #define AHB_ARBITRATION_PRIORITY_CTRL   0x08
  36 #define   AHB_PRIORITY_WEIGHT(x)        (((x) & 0x7) << 29)
  37 #define   PRIORITY_SELECT_USB BIT(6)
  38 #define   PRIORITY_SELECT_USB2 BIT(18)
  39 #define   PRIORITY_SELECT_USB3 BIT(17)
  40
  41 #define AHB_GIZMO_AHB_MEM               0x10
  42 #define   ENB_FAST_REARBITRATE BIT(2)
  43 #define   DONT_SPLIT_AHB_WR     BIT(7)
  44
  45 #define AHB_GIZMO_APB_DMA               0x14
  46 #define AHB_GIZMO_IDE                   0x1c
  47 #define AHB_GIZMO_USB                   0x20
  48 #define AHB_GIZMO_AHB_XBAR_BRIDGE       0x24
  49 #define AHB_GIZMO_CPU_AHB_BRIDGE        0x28
  50 #define AHB_GIZMO_COP_AHB_BRIDGE        0x2c
  51 #define AHB_GIZMO_XBAR_APB_CTLR         0x30
  52 #define AHB_GIZMO_VCP_AHB_BRIDGE        0x34
  53 #define AHB_GIZMO_NAND                  0x40
  54 #define AHB_GIZMO_SDMMC4                0x48
  55 #define AHB_GIZMO_XIO                   0x4c
  56 #define AHB_GIZMO_BSEV                  0x64
  57 #define AHB_GIZMO_BSEA                  0x74
  58 #define AHB_GIZMO_NOR                   0x78
  59 #define AHB_GIZMO_USB2                  0x7c
  60 #define AHB_GIZMO_USB3                  0x80
  61 #define   IMMEDIATE     BIT(18)
  62
  63 #define AHB_GIZMO_SDMMC1                0x84
  64 #define AHB_GIZMO_SDMMC2                0x88
  65 #define AHB_GIZMO_SDMMC3                0x8c
  66 #define AHB_MEM_PREFETCH_CFG_X          0xdc
  67 #define AHB_ARBITRATION_XBAR_CTRL       0xe0
  68 #define AHB_MEM_PREFETCH_CFG3           0xe4
  69 #define AHB_MEM_PREFETCH_CFG4           0xe8
  70 #define AHB_MEM_PREFETCH_CFG1           0xf0
  71 #define AHB_MEM_PREFETCH_CFG2           0xf4
  72 #define   PREFETCH_ENB  BIT(31)
  73 #define   MST_ID(x)     (((x) & 0x1f) << 26)
  74 #define   AHBDMA_MST_ID MST_ID(5)
  75 #define   USB_MST_ID    MST_ID(6)
  76 #define   USB2_MST_ID   MST_ID(18)
  77 #define   USB3_MST_ID   MST_ID(17)
  78 #define   ADDR_BNDRY(x) (((x) & 0xf) << 21)
  79 #define   INACTIVITY_TIMEOUT(x) (((x) & 0xffff) << 0)
  80
  81 #define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID    0xfc
  82
  83 #define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
  84
  85 /*
  86  * INCORRECT_BASE_ADDR_LOW_BYTE: Legacy kernel DT files for Tegra SoCs
  87  * prior to Tegra124 generally use a physical base address ending in
  88  * 0x4 for the AHB IP block.  According to the TRM, the low byte
  89  * should be 0x0.  During device probing, this macro is used to detect
  90  * whether the passed-in physical address is incorrect, and if so, to
  91  * correct it.
  92  */
  93 #define INCORRECT_BASE_ADDR_LOW_BYTE            0x4
  94
  95 static struct platform_driver tegra_ahb_driver;
  96
  97 static const u32 tegra_ahb_gizmo[] = {
  98         AHB_ARBITRATION_DISABLE,
  99         AHB_ARBITRATION_PRIORITY_CTRL,
 100         AHB_GIZMO_AHB_MEM,
 101         AHB_GIZMO_APB_DMA,
 102         AHB_GIZMO_IDE,
 103         AHB_GIZMO_USB,
 104         AHB_GIZMO_AHB_XBAR_BRIDGE,
 105         AHB_GIZMO_CPU_AHB_BRIDGE,
 106         AHB_GIZMO_COP_AHB_BRIDGE,
 107         AHB_GIZMO_XBAR_APB_CTLR,
 108         AHB_GIZMO_VCP_AHB_BRIDGE,
 109         AHB_GIZMO_NAND,
 110         AHB_GIZMO_SDMMC4,
 111         AHB_GIZMO_XIO,
 112         AHB_GIZMO_BSEV,
 113         AHB_GIZMO_BSEA,
 114         AHB_GIZMO_NOR,
 115         AHB_GIZMO_USB2,
 116         AHB_GIZMO_USB3,
 117         AHB_GIZMO_SDMMC1,
 118         AHB_GIZMO_SDMMC2,
 119         AHB_GIZMO_SDMMC3,
 120         AHB_MEM_PREFETCH_CFG_X,
 121         AHB_ARBITRATION_XBAR_CTRL,
 122         AHB_MEM_PREFETCH_CFG3,
 123         AHB_MEM_PREFETCH_CFG4,
 124         AHB_MEM_PREFETCH_CFG1,
 125         AHB_MEM_PREFETCH_CFG2,
 126         AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
 127 };
 128
 129 struct tegra_ahb {
 130         void __iomem    *regs;
 131         struct device   *dev;
 132         u32             ctx[0];
 133 };
 134
 135 static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
 136 {
 137         return readl(ahb->regs + offset);
 138 }
 139
 140 static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
 141 {
 142         writel(value, ahb->regs + offset);
 143 }
 144
 145 #ifdef CONFIG_TEGRA_IOMMU_SMMU
 146 static int tegra_ahb_match_by_smmu(struct device *dev, void *data)
 147 {
 148         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 149         struct device_node *dn = data;
 150
 151         return (ahb->dev->of_node == dn) ? 1 : 0;
 152 }
 153
 154 int tegra_ahb_enable_smmu(struct device_node *dn)
 155 {
 156         struct device *dev;
 157         u32 val;
 158         struct tegra_ahb *ahb;
 159
 160         dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
 161                                  tegra_ahb_match_by_smmu);
 162         if (!dev)
 163                 return -EPROBE_DEFER;
 164         ahb = dev_get_drvdata(dev);
 165         val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
 166         val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
 167         gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
 168         return 0;
 169 }
 170 EXPORT_SYMBOL(tegra_ahb_enable_smmu);
 171 #endif
 172
 173 static int __maybe_unused tegra_ahb_suspend(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                 ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
 180         return 0;
 181 }
 182
 183 static int __maybe_unused tegra_ahb_resume(struct device *dev)
 184 {
 185         int i;
 186         struct tegra_ahb *ahb = dev_get_drvdata(dev);
 187
 188         for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
 189                 gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
 190         return 0;
 191 }
 192
 193 static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
 194                             tegra_ahb_suspend,
 195                             tegra_ahb_resume, NULL);
 196
 197 static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
 198 {
 199         u32 val;
 200
 201         val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
 202         val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
 203         gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);
 204
 205         val = gizmo_readl(ahb, AHB_GIZMO_USB);
 206         val |= IMMEDIATE;
 207         gizmo_writel(ahb, val, AHB_GIZMO_USB);
 208
 209         val = gizmo_readl(ahb, AHB_GIZMO_USB2);
 210         val |= IMMEDIATE;
 211         gizmo_writel(ahb, val, AHB_GIZMO_USB2);
 212
 213         val = gizmo_readl(ahb, AHB_GIZMO_USB3);
 214         val |= IMMEDIATE;
 215         gizmo_writel(ahb, val, AHB_GIZMO_USB3);
 216
 217         val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
 218         val |= PRIORITY_SELECT_USB |
 219                 PRIORITY_SELECT_USB2 |
 220                 PRIORITY_SELECT_USB3 |
 221                 AHB_PRIORITY_WEIGHT(7);
 222         gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);
 223
 224         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
 225         val &= ~MST_ID(~0);
 226         val |= PREFETCH_ENB |
 227                 AHBDMA_MST_ID |
 228                 ADDR_BNDRY(0xc) |
 229                 INACTIVITY_TIMEOUT(0x1000);
 230         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);
 231
 232         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
 233         val &= ~MST_ID(~0);
 234         val |= PREFETCH_ENB |
 235                 USB_MST_ID |
 236                 ADDR_BNDRY(0xc) |
 237                 INACTIVITY_TIMEOUT(0x1000);
 238         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);
 239
 240         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
 241         val &= ~MST_ID(~0);
 242         val |= PREFETCH_ENB |
 243                 USB3_MST_ID |
 244                 ADDR_BNDRY(0xc) |
 245                 INACTIVITY_TIMEOUT(0x1000);
 246         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);
 247
 248         val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
 249         val &= ~MST_ID(~0);
 250         val |= PREFETCH_ENB |
 251                 USB2_MST_ID |
 252                 ADDR_BNDRY(0xc) |
 253                 INACTIVITY_TIMEOUT(0x1000);
 254         gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
 255 }
 256
 257 static int tegra_ahb_probe(struct platform_device *pdev)
 258 {
 259         struct resource *res;
 260         struct tegra_ahb *ahb;
 261         size_t bytes;
 262
 263         bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
 264         ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
 265         if (!ahb)
 266                 return -ENOMEM;
 267
 268         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 269
 270         /* Correct the IP block base address if necessary */
 271         if (res &&
 272             (res->start & INCORRECT_BASE_ADDR_LOW_BYTE) ==
 273             INCORRECT_BASE_ADDR_LOW_BYTE) {
 274                 dev_warn(&pdev->dev, "incorrect AHB base address in DT data - enabling workaround\n");
 275                 res->start -= INCORRECT_BASE_ADDR_LOW_BYTE;
 276         }
 277
 278         ahb->regs = devm_ioremap_resource(&pdev->dev, res);
 279         if (IS_ERR(ahb->regs))
 280                 return PTR_ERR(ahb->regs);
 281
 282         ahb->dev = &pdev->dev;
 283         platform_set_drvdata(pdev, ahb);
 284         tegra_ahb_gizmo_init(ahb);
 285         return 0;
 286 }
 287
 288 static const struct of_device_id tegra_ahb_of_match[] = {
 289         { .compatible = "nvidia,tegra30-ahb", },
 290         { .compatible = "nvidia,tegra20-ahb", },
 291         {},
 292 };
 293
 294 static struct platform_driver tegra_ahb_driver = {
 295         .probe = tegra_ahb_probe,
 296         .driver = {
 297                 .name = DRV_NAME,
 298                 .of_match_table = tegra_ahb_of_match,
 299                 .pm = &tegra_ahb_pm,
 300         },
 301 };
 302 module_platform_driver(tegra_ahb_driver);
 303
 304 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
 305 MODULE_DESCRIPTION("Tegra AHB driver");
 306 MODULE_LICENSE("GPL v2");
 307 MODULE_ALIAS("platform:" DRV_NAME);