drivers/memory/tegra20-mc.c

   1 /*
   2  * Tegra20 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 "tegra20-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_INVALID_GART_PAGE        BIT(MC_INT_ERR_SHIFT + 1)
  37 #define MC_INT_SECURITY_VIOLATION       BIT(MC_INT_ERR_SHIFT + 2)
  38 #define MC_INT_ARBITRATION_EMEM         BIT(MC_INT_ERR_SHIFT + 3)
  39
  40 #define MC_GART_ERROR_REQ               0x30
  41 #define MC_DECERR_EMEM_OTHERS_STATUS    0x58
  42 #define MC_SECURITY_VIOLATION_STATUS    0x74
  43
  44 #define SECURITY_VIOLATION_TYPE         BIT(30) /* 0=TRUSTZONE, 1=CARVEOUT */
  45
  46 #define MC_CLIENT_ID_MASK               0x3f
  47
  48 #define NUM_MC_REG_BANKS                2
  49
  50 struct tegra20_mc {
  51         void __iomem *regs[NUM_MC_REG_BANKS];
  52         struct device *dev;
  53 };
  54
  55 static inline u32 mc_readl(struct tegra20_mc *mc, u32 offs)
  56 {
  57         u32 val = 0;
  58
  59         if (offs < 0x24)
  60                 val = readl(mc->regs[0] + offs);
  61         else if (offs < 0x400)
  62                 val = readl(mc->regs[1] + offs - 0x3c);
  63
  64         return val;
  65 }
  66
  67 static inline void mc_writel(struct tegra20_mc *mc, u32 val, u32 offs)
  68 {
  69         if (offs < 0x24)
  70                 writel(val, mc->regs[0] + offs);
  71         else if (offs < 0x400)
  72                 writel(val, mc->regs[1] + offs - 0x3c);
  73 }
  74
  75 static const char * const tegra20_mc_client[] = {
  76         "cbr_display0a",
  77         "cbr_display0ab",
  78         "cbr_display0b",
  79         "cbr_display0bb",
  80         "cbr_display0c",
  81         "cbr_display0cb",
  82         "cbr_display1b",
  83         "cbr_display1bb",
  84         "cbr_eppup",
  85         "cbr_g2pr",
  86         "cbr_g2sr",
  87         "cbr_mpeunifbr",
  88         "cbr_viruv",
  89         "csr_avpcarm7r",
  90         "csr_displayhc",
  91         "csr_displayhcb",
  92         "csr_fdcdrd",
  93         "csr_g2dr",
  94         "csr_host1xdmar",
  95         "csr_host1xr",
  96         "csr_idxsrd",
  97         "csr_mpcorer",
  98         "csr_mpe_ipred",
  99         "csr_mpeamemrd",
 100         "csr_mpecsrd",
 101         "csr_ppcsahbdmar",
 102         "csr_ppcsahbslvr",
 103         "csr_texsrd",
 104         "csr_vdebsevr",
 105         "csr_vdember",
 106         "csr_vdemcer",
 107         "csr_vdetper",
 108         "cbw_eppu",
 109         "cbw_eppv",
 110         "cbw_eppy",
 111         "cbw_mpeunifbw",
 112         "cbw_viwsb",
 113         "cbw_viwu",
 114         "cbw_viwv",
 115         "cbw_viwy",
 116         "ccw_g2dw",
 117         "csw_avpcarm7w",
 118         "csw_fdcdwr",
 119         "csw_host1xw",
 120         "csw_ispw",
 121         "csw_mpcorew",
 122         "csw_mpecswr",
 123         "csw_ppcsahbdmaw",
 124         "csw_ppcsahbslvw",
 125         "csw_vdebsevw",
 126         "csw_vdembew",
 127         "csw_vdetpmw",
 128 };
 129
 130 static void tegra20_mc_decode(struct tegra20_mc *mc, int n)
 131 {
 132         u32 addr, req;
 133         const char *client = "Unknown";
 134         int idx, cid;
 135         const struct reg_info {
 136                 u32 offset;
 137                 u32 write_bit;  /* 0=READ, 1=WRITE */
 138                 int cid_shift;
 139                 char *message;
 140         } reg[] = {
 141                 {
 142                         .offset = MC_DECERR_EMEM_OTHERS_STATUS,
 143                         .write_bit = 31,
 144                         .message = "MC_DECERR",
 145                 },
 146                 {
 147                         .offset = MC_GART_ERROR_REQ,
 148                         .cid_shift = 1,
 149                         .message = "MC_GART_ERR",
 150
 151                 },
 152                 {
 153                         .offset = MC_SECURITY_VIOLATION_STATUS,
 154                         .write_bit = 31,
 155                         .message = "MC_SECURITY_ERR",
 156                 },
 157         };
 158
 159         idx = n - MC_INT_ERR_SHIFT;
 160         if ((idx < 0) || (idx >= ARRAY_SIZE(reg))) {
 161                 dev_err_ratelimited(mc->dev, "Unknown interrupt status %08lx\n",
 162                                     BIT(n));
 163                 return;
 164         }
 165
 166         req = mc_readl(mc, reg[idx].offset);
 167         cid = (req >> reg[idx].cid_shift) & MC_CLIENT_ID_MASK;
 168         if (cid < ARRAY_SIZE(tegra20_mc_client))
 169                 client = tegra20_mc_client[cid];
 170
 171         addr = mc_readl(mc, reg[idx].offset + sizeof(u32));
 172
 173         dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s)\n",
 174                            reg[idx].message, req, addr, client,
 175                            (req & BIT(reg[idx].write_bit)) ? "write" : "read",
 176                            (reg[idx].offset == MC_SECURITY_VIOLATION_STATUS) ?
 177                            ((req & SECURITY_VIOLATION_TYPE) ?
 178                             "carveout" : "trustzone") : "");
 179 }
 180
 181 static const struct of_device_id tegra20_mc_of_match[] = {
 182         { .compatible = "nvidia,tegra20-mc", },
 183         {},
 184 };
 185
 186 static irqreturn_t tegra20_mc_isr(int irq, void *data)
 187 {
 188         u32 stat, mask, bit;
 189         struct tegra20_mc *mc = data;
 190
 191         stat = mc_readl(mc, MC_INTSTATUS);
 192         mask = mc_readl(mc, MC_INTMASK);
 193         mask &= stat;
 194         if (!mask)
 195                 return IRQ_NONE;
 196         while ((bit = ffs(mask)) != 0) {
 197                 tegra20_mc_decode(mc, bit - 1);
 198                 mask &= ~BIT(bit - 1);
 199         }
 200
 201         mc_writel(mc, stat, MC_INTSTATUS);
 202         return IRQ_HANDLED;
 203 }
 204
 205 static int tegra20_mc_probe(struct platform_device *pdev)
 206 {
 207         struct resource *irq;
 208         struct tegra20_mc *mc;
 209         int i, err;
 210         u32 intmask;
 211
 212         mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
 213         if (!mc)
 214                 return -ENOMEM;
 215         mc->dev = &pdev->dev;
 216
 217         for (i = 0; i < ARRAY_SIZE(mc->regs); i++) {
 218                 struct resource *res;
 219
 220                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 221                 mc->regs[i] = devm_ioremap_resource(&pdev->dev, res);
 222                 if (IS_ERR(mc->regs[i]))
 223                         return PTR_ERR(mc->regs[i]);
 224         }
 225
 226         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 227         if (!irq)
 228                 return -ENODEV;
 229         err = devm_request_irq(&pdev->dev, irq->start, tegra20_mc_isr,
 230                                IRQF_SHARED, dev_name(&pdev->dev), mc);
 231         if (err)
 232                 return -ENODEV;
 233
 234         platform_set_drvdata(pdev, mc);
 235
 236         intmask = MC_INT_INVALID_GART_PAGE |
 237                 MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION;
 238         mc_writel(mc, intmask, MC_INTMASK);
 239         return 0;
 240 }
 241
 242 static struct platform_driver tegra20_mc_driver = {
 243         .probe = tegra20_mc_probe,
 244         .driver = {
 245                 .name = DRV_NAME,
 246                 .of_match_table = tegra20_mc_of_match,
 247         },
 248 };
 249 module_platform_driver(tegra20_mc_driver);
 250
 251 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
 252 MODULE_DESCRIPTION("Tegra20 MC driver");
 253 MODULE_LICENSE("GPL v2");
 254 MODULE_ALIAS("platform:" DRV_NAME);