drivers/memory/tegra30-mc.c

   1 /*
   2  * Tegra30 Memory Controller
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <linux/err.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/ratelimit.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27
  28 #define DRV_NAME "tegra30-mc"
  29
  30 #define MC_INTSTATUS                    0x0
  31 #define MC_INTMASK                      0x4
  32
  33 #define MC_INT_ERR_SHIFT                6
  34 #define MC_INT_ERR_MASK                 (0x1f << MC_INT_ERR_SHIFT)
  35 #define MC_INT_DECERR_EMEM              BIT(MC_INT_ERR_SHIFT)
  36 #define MC_INT_SECURITY_VIOLATION       BIT(MC_INT_ERR_SHIFT + 2)
  37 #define MC_INT_ARBITRATION_EMEM         BIT(MC_INT_ERR_SHIFT + 3)
  38 #define MC_INT_INVALID_SMMU_PAGE        BIT(MC_INT_ERR_SHIFT + 4)
  39
  40 #define MC_ERR_STATUS                   0x8
  41 #define MC_ERR_ADR                      0xc
  42
  43 #define MC_ERR_TYPE_SHIFT               28
  44 #define MC_ERR_TYPE_MASK                (7 << MC_ERR_TYPE_SHIFT)
  45 #define MC_ERR_TYPE_DECERR_EMEM         2
  46 #define MC_ERR_TYPE_SECURITY_TRUSTZONE  3
  47 #define MC_ERR_TYPE_SECURITY_CARVEOUT   4
  48 #define MC_ERR_TYPE_INVALID_SMMU_PAGE   6
  49
  50 #define MC_ERR_INVALID_SMMU_PAGE_SHIFT  25
  51 #define MC_ERR_INVALID_SMMU_PAGE_MASK   (7 << MC_ERR_INVALID_SMMU_PAGE_SHIFT)
  52 #define MC_ERR_RW_SHIFT                 16
  53 #define MC_ERR_RW                       BIT(MC_ERR_RW_SHIFT)
  54 #define MC_ERR_SECURITY                 BIT(MC_ERR_RW_SHIFT + 1)
  55
  56 #define SECURITY_VIOLATION_TYPE         BIT(30) /* 0=TRUSTZONE, 1=CARVEOUT */
  57
  58 #define MC_EMEM_ARB_CFG                 0x90
  59 #define MC_EMEM_ARB_OUTSTANDING_REQ     0x94
  60 #define MC_EMEM_ARB_TIMING_RCD          0x98
  61 #define MC_EMEM_ARB_TIMING_RP           0x9c
  62 #define MC_EMEM_ARB_TIMING_RC           0xa0
  63 #define MC_EMEM_ARB_TIMING_RAS          0xa4
  64 #define MC_EMEM_ARB_TIMING_FAW          0xa8
  65 #define MC_EMEM_ARB_TIMING_RRD          0xac
  66 #define MC_EMEM_ARB_TIMING_RAP2PRE      0xb0
  67 #define MC_EMEM_ARB_TIMING_WAP2PRE      0xb4
  68 #define MC_EMEM_ARB_TIMING_R2R          0xb8
  69 #define MC_EMEM_ARB_TIMING_W2W          0xbc
  70 #define MC_EMEM_ARB_TIMING_R2W          0xc0
  71 #define MC_EMEM_ARB_TIMING_W2R          0xc4
  72
  73 #define MC_EMEM_ARB_DA_TURNS            0xd0
  74 #define MC_EMEM_ARB_DA_COVERS           0xd4
  75 #define MC_EMEM_ARB_MISC0               0xd8
  76 #define MC_EMEM_ARB_MISC1               0xdc
  77
  78 #define MC_EMEM_ARB_RING3_THROTTLE      0xe4
  79 #define MC_EMEM_ARB_OVERRIDE            0xe8
  80
  81 #define MC_TIMING_CONTROL               0xfc
  82
  83 #define MC_CLIENT_ID_MASK               0x7f
  84
  85 #define NUM_MC_REG_BANKS                4
  86
  87 struct tegra30_mc {
  88         void __iomem *regs[NUM_MC_REG_BANKS];
  89         struct device *dev;
  90         u32 ctx[0];
  91 };
  92
  93 static inline u32 mc_readl(struct tegra30_mc *mc, u32 offs)
  94 {
  95         u32 val = 0;
  96
  97         if (offs < 0x10)
  98                 val = readl(mc->regs[0] + offs);
  99         else if (offs < 0x1f0)
 100                 val = readl(mc->regs[1] + offs - 0x3c);
 101         else if (offs < 0x228)
 102                 val = readl(mc->regs[2] + offs - 0x200);
 103         else if (offs < 0x400)
 104                 val = readl(mc->regs[3] + offs - 0x284);
 105
 106         return val;
 107 }
 108
 109 static inline void mc_writel(struct tegra30_mc *mc, u32 val, u32 offs)
 110 {
 111         if (offs < 0x10)
 112                 writel(val, mc->regs[0] + offs);
 113         else if (offs < 0x1f0)
 114                 writel(val, mc->regs[1] + offs - 0x3c);
 115         else if (offs < 0x228)
 116                 writel(val, mc->regs[2] + offs - 0x200);
 117         else if (offs < 0x400)
 118                 writel(val, mc->regs[3] + offs - 0x284);
 119 }
 120
 121 static const char * const tegra30_mc_client[] = {
 122         "csr_ptcr",
 123         "cbr_display0a",
 124         "cbr_display0ab",
 125         "cbr_display0b",
 126         "cbr_display0bb",
 127         "cbr_display0c",
 128         "cbr_display0cb",
 129         "cbr_display1b",
 130         "cbr_display1bb",
 131         "cbr_eppup",
 132         "cbr_g2pr",
 133         "cbr_g2sr",
 134         "cbr_mpeunifbr",
 135         "cbr_viruv",
 136         "csr_afir",
 137         "csr_avpcarm7r",
 138         "csr_displayhc",
 139         "csr_displayhcb",
 140         "csr_fdcdrd",
 141         "csr_fdcdrd2",
 142         "csr_g2dr",
 143         "csr_hdar",
 144         "csr_host1xdmar",
 145         "csr_host1xr",
 146         "csr_idxsrd",
 147         "csr_idxsrd2",
 148         "csr_mpe_ipred",
 149         "csr_mpeamemrd",
 150         "csr_mpecsrd",
 151         "csr_ppcsahbdmar",
 152         "csr_ppcsahbslvr",
 153         "csr_satar",
 154         "csr_texsrd",
 155         "csr_texsrd2",
 156         "csr_vdebsevr",
 157         "csr_vdember",
 158         "csr_vdemcer",
 159         "csr_vdetper",
 160         "csr_mpcorelpr",
 161         "csr_mpcorer",
 162         "cbw_eppu",
 163         "cbw_eppv",
 164         "cbw_eppy",
 165         "cbw_mpeunifbw",
 166         "cbw_viwsb",
 167         "cbw_viwu",
 168         "cbw_viwv",
 169         "cbw_viwy",
 170         "ccw_g2dw",
 171         "csw_afiw",
 172         "csw_avpcarm7w",
 173         "csw_fdcdwr",
 174         "csw_fdcdwr2",
 175         "csw_hdaw",
 176         "csw_host1xw",
 177         "csw_ispw",
 178         "csw_mpcorelpw",
 179         "csw_mpcorew",
 180         "csw_mpecswr",
 181         "csw_ppcsahbdmaw",
 182         "csw_ppcsahbslvw",
 183         "csw_sataw",
 184         "csw_vdebsevw",
 185         "csw_vdedbgw",
 186         "csw_vdembew",
 187         "csw_vdetpmw",
 188 };
 189
 190 static void tegra30_mc_decode(struct tegra30_mc *mc, int n)
 191 {
 192         u32 err, addr;
 193         const char * const mc_int_err[] = {
 194                 "MC_DECERR",
 195                 "Unknown",
 196                 "MC_SECURITY_ERR",
 197                 "MC_ARBITRATION_EMEM",
 198                 "MC_SMMU_ERR",
 199         };
 200         const char * const err_type[] = {
 201                 "Unknown",
 202                 "Unknown",
 203                 "DECERR_EMEM",
 204                 "SECURITY_TRUSTZONE",
 205                 "SECURITY_CARVEOUT",
 206                 "Unknown",
 207                 "INVALID_SMMU_PAGE",
 208                 "Unknown",
 209         };
 210         char attr[6];
 211         int cid, perm, type, idx;
 212         const char *client = "Unknown";
 213
 214         idx = n - MC_INT_ERR_SHIFT;
 215         if ((idx < 0) || (idx >= ARRAY_SIZE(mc_int_err)) || (idx == 1)) {
 216                 dev_err_ratelimited(mc->dev, "Unknown interrupt status %08lx\n",
 217                                     BIT(n));
 218                 return;
 219         }
 220
 221         err = mc_readl(mc, MC_ERR_STATUS);
 222
 223         type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT;
 224         perm = (err & MC_ERR_INVALID_SMMU_PAGE_MASK) >>
 225                 MC_ERR_INVALID_SMMU_PAGE_SHIFT;
 226         if (type == MC_ERR_TYPE_INVALID_SMMU_PAGE)
 227                 sprintf(attr, "%c-%c-%c",
 228                         (perm & BIT(2)) ? 'R' : '-',
 229                         (perm & BIT(1)) ? 'W' : '-',
 230                         (perm & BIT(0)) ? 'S' : '-');
 231         else
 232                 attr[0] = '\0';
 233
 234         cid = err & MC_CLIENT_ID_MASK;
 235         if (cid < ARRAY_SIZE(tegra30_mc_client))
 236                 client = tegra30_mc_client[cid];
 237
 238         addr = mc_readl(mc, MC_ERR_ADR);
 239
 240         dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s %s %s)\n",
 241                            mc_int_err[idx], err, addr, client,
 242                            (err & MC_ERR_SECURITY) ? "secure" : "non-secure",
 243                            (err & MC_ERR_RW) ? "write" : "read",
 244                            err_type[type], attr);
 245 }
 246
 247 static const u32 tegra30_mc_ctx[] = {
 248         MC_EMEM_ARB_CFG,
 249         MC_EMEM_ARB_OUTSTANDING_REQ,
 250         MC_EMEM_ARB_TIMING_RCD,
 251         MC_EMEM_ARB_TIMING_RP,
 252         MC_EMEM_ARB_TIMING_RC,
 253         MC_EMEM_ARB_TIMING_RAS,
 254         MC_EMEM_ARB_TIMING_FAW,
 255         MC_EMEM_ARB_TIMING_RRD,
 256         MC_EMEM_ARB_TIMING_RAP2PRE,
 257         MC_EMEM_ARB_TIMING_WAP2PRE,
 258         MC_EMEM_ARB_TIMING_R2R,
 259         MC_EMEM_ARB_TIMING_W2W,
 260         MC_EMEM_ARB_TIMING_R2W,
 261         MC_EMEM_ARB_TIMING_W2R,
 262         MC_EMEM_ARB_DA_TURNS,
 263         MC_EMEM_ARB_DA_COVERS,
 264         MC_EMEM_ARB_MISC0,
 265         MC_EMEM_ARB_MISC1,
 266         MC_EMEM_ARB_RING3_THROTTLE,
 267         MC_EMEM_ARB_OVERRIDE,
 268         MC_INTMASK,
 269 };
 270
 271 #ifdef CONFIG_PM
 272 static int tegra30_mc_suspend(struct device *dev)
 273 {
 274         int i;
 275         struct tegra30_mc *mc = dev_get_drvdata(dev);
 276
 277         for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
 278                 mc->ctx[i] = mc_readl(mc, tegra30_mc_ctx[i]);
 279         return 0;
 280 }
 281
 282 static int tegra30_mc_resume(struct device *dev)
 283 {
 284         int i;
 285         struct tegra30_mc *mc = dev_get_drvdata(dev);
 286
 287         for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
 288                 mc_writel(mc, mc->ctx[i], tegra30_mc_ctx[i]);
 289
 290         mc_writel(mc, 1, MC_TIMING_CONTROL);
 291         /* Read-back to ensure that write reached */
 292         mc_readl(mc, MC_TIMING_CONTROL);
 293         return 0;
 294 }
 295 #endif
 296
 297 static UNIVERSAL_DEV_PM_OPS(tegra30_mc_pm,
 298                             tegra30_mc_suspend,
 299                             tegra30_mc_resume, NULL);
 300
 301 static const struct of_device_id tegra30_mc_of_match[] = {
 302         { .compatible = "nvidia,tegra30-mc", },
 303         {},
 304 };
 305
 306 static irqreturn_t tegra30_mc_isr(int irq, void *data)
 307 {
 308         u32 stat, mask, bit;
 309         struct tegra30_mc *mc = data;
 310
 311         stat = mc_readl(mc, MC_INTSTATUS);
 312         mask = mc_readl(mc, MC_INTMASK);
 313         mask &= stat;
 314         if (!mask)
 315                 return IRQ_NONE;
 316         while ((bit = ffs(mask)) != 0) {
 317                 tegra30_mc_decode(mc, bit - 1);
 318                 mask &= ~BIT(bit - 1);
 319         }
 320
 321         mc_writel(mc, stat, MC_INTSTATUS);
 322         return IRQ_HANDLED;
 323 }
 324
 325 static int tegra30_mc_probe(struct platform_device *pdev)
 326 {
 327         struct resource *irq;
 328         struct tegra30_mc *mc;
 329         size_t bytes;
 330         int err, i;
 331         u32 intmask;
 332
 333         bytes = sizeof(*mc) + sizeof(u32) * ARRAY_SIZE(tegra30_mc_ctx);
 334         mc = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
 335         if (!mc)
 336                 return -ENOMEM;
 337         mc->dev = &pdev->dev;
 338
 339         for (i = 0; i < ARRAY_SIZE(mc->regs); i++) {
 340                 struct resource *res;
 341
 342                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 343                 if (!res)
 344                         return -ENODEV;
 345                 mc->regs[i] = devm_ioremap_resource(&pdev->dev, res);
 346                 if (IS_ERR(mc->regs[i]))
 347                         return PTR_ERR(mc->regs[i]);
 348         }
 349
 350         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 351         if (!irq)
 352                 return -ENODEV;
 353         err = devm_request_irq(&pdev->dev, irq->start, tegra30_mc_isr,
 354                                IRQF_SHARED, dev_name(&pdev->dev), mc);
 355         if (err)
 356                 return -ENODEV;
 357
 358         platform_set_drvdata(pdev, mc);
 359
 360         intmask = MC_INT_INVALID_SMMU_PAGE |
 361                 MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION;
 362         mc_writel(mc, intmask, MC_INTMASK);
 363         return 0;
 364 }
 365
 366 static struct platform_driver tegra30_mc_driver = {
 367         .probe = tegra30_mc_probe,
 368         .driver = {
 369                 .name = DRV_NAME,
 370                 .owner = THIS_MODULE,
 371                 .of_match_table = tegra30_mc_of_match,
 372                 .pm = &tegra30_mc_pm,
 373         },
 374 };
 375 module_platform_driver(tegra30_mc_driver);
 376
 377 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
 378 MODULE_DESCRIPTION("Tegra30 MC driver");
 379 MODULE_LICENSE("GPL v2");
 380 MODULE_ALIAS("platform:" DRV_NAME);