drivers/bus/omap_l3_smx.c

   1 /*
   2  * OMAP3XXX L3 Interconnect Driver
   3  *
   4  * Copyright (C) 2011 Texas Corporation
   5  *      Felipe Balbi <balbi@ti.com>
   6  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
   7  *      Sricharan <r.sricharan@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22  * USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/slab.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/io.h>
  30 #include "omap_l3_smx.h"
  31
  32 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
  33 {
  34         return __raw_readll(base + reg);
  35 }
  36
  37 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
  38 {
  39         __raw_writell(value, base + reg);
  40 }
  41
  42 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
  43 {
  44         return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
  45 }
  46
  47 static inline u32 omap3_l3_decode_addr(u64 error_addr)
  48 {
  49         return error_addr & 0xffffffff;
  50 }
  51
  52 static inline unsigned omap3_l3_decode_cmd(u64 error)
  53 {
  54         return (error & 0x07) >> L3_ERROR_LOG_CMD;
  55 }
  56
  57 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
  58 {
  59         return (error & 0xff00) >> L3_ERROR_LOG_INITID;
  60 }
  61
  62 static inline unsigned omap3_l3_decode_req_info(u64 error)
  63 {
  64         return (error >> 32) & 0xffff;
  65 }
  66
  67 static char *omap3_l3_code_string(u8 code)
  68 {
  69         switch (code) {
  70         case OMAP_L3_CODE_NOERROR:
  71                 return "No Error";
  72         case OMAP_L3_CODE_UNSUP_CMD:
  73                 return "Unsupported Command";
  74         case OMAP_L3_CODE_ADDR_HOLE:
  75                 return "Address Hole";
  76         case OMAP_L3_CODE_PROTECT_VIOLATION:
  77                 return "Protection Violation";
  78         case OMAP_L3_CODE_IN_BAND_ERR:
  79                 return "In-band Error";
  80         case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
  81                 return "Request Timeout Not Accepted";
  82         case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
  83                 return "Request Timeout, no response";
  84         default:
  85                 return "UNKNOWN error";
  86         }
  87 }
  88
  89 static char *omap3_l3_initiator_string(u8 initid)
  90 {
  91         switch (initid) {
  92         case OMAP_L3_LCD:
  93                 return "LCD";
  94         case OMAP_L3_SAD2D:
  95                 return "SAD2D";
  96         case OMAP_L3_IA_MPU_SS_1:
  97         case OMAP_L3_IA_MPU_SS_2:
  98         case OMAP_L3_IA_MPU_SS_3:
  99         case OMAP_L3_IA_MPU_SS_4:
 100         case OMAP_L3_IA_MPU_SS_5:
 101                 return "MPU";
 102         case OMAP_L3_IA_IVA_SS_1:
 103         case OMAP_L3_IA_IVA_SS_2:
 104         case OMAP_L3_IA_IVA_SS_3:
 105                 return "IVA_SS";
 106         case OMAP_L3_IA_IVA_SS_DMA_1:
 107         case OMAP_L3_IA_IVA_SS_DMA_2:
 108         case OMAP_L3_IA_IVA_SS_DMA_3:
 109         case OMAP_L3_IA_IVA_SS_DMA_4:
 110         case OMAP_L3_IA_IVA_SS_DMA_5:
 111         case OMAP_L3_IA_IVA_SS_DMA_6:
 112                 return "IVA_SS_DMA";
 113         case OMAP_L3_IA_SGX:
 114                 return "SGX";
 115         case OMAP_L3_IA_CAM_1:
 116         case OMAP_L3_IA_CAM_2:
 117         case OMAP_L3_IA_CAM_3:
 118                 return "CAM";
 119         case OMAP_L3_IA_DAP:
 120                 return "DAP";
 121         case OMAP_L3_SDMA_WR_1:
 122         case OMAP_L3_SDMA_WR_2:
 123                 return "SDMA_WR";
 124         case OMAP_L3_SDMA_RD_1:
 125         case OMAP_L3_SDMA_RD_2:
 126         case OMAP_L3_SDMA_RD_3:
 127         case OMAP_L3_SDMA_RD_4:
 128                 return "SDMA_RD";
 129         case OMAP_L3_USBOTG:
 130                 return "USB_OTG";
 131         case OMAP_L3_USBHOST:
 132                 return "USB_HOST";
 133         default:
 134                 return "UNKNOWN Initiator";
 135         }
 136 }
 137
 138 /*
 139  * omap3_l3_block_irq - handles a register block's irq
 140  * @l3: struct omap3_l3 *
 141  * @base: register block base address
 142  * @error: L3_ERROR_LOG register of our block
 143  *
 144  * Called in hard-irq context. Caller should take care of locking
 145  *
 146  * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
 147  * Analysis Sequence, we are following that sequence here, please
 148  * refer to that Figure for more information on the subject.
 149  */
 150 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
 151                                         u64 error, int error_addr)
 152 {
 153         u8 code = omap3_l3_decode_error_code(error);
 154         u8 initid = omap3_l3_decode_initid(error);
 155         u8 multi = error & L3_ERROR_LOG_MULTI;
 156         u32 address = omap3_l3_decode_addr(error_addr);
 157
 158         pr_err("%s seen by %s %s at address %x\n",
 159                         omap3_l3_code_string(code),
 160                         omap3_l3_initiator_string(initid),
 161                         multi ? "Multiple Errors" : "", address);
 162         WARN_ON(1);
 163
 164         return IRQ_HANDLED;
 165 }
 166
 167 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
 168 {
 169         struct omap3_l3 *l3 = _l3;
 170         u64 status, clear;
 171         u64 error;
 172         u64 error_addr;
 173         u64 err_source = 0;
 174         void __iomem *base;
 175         int int_type;
 176         irqreturn_t ret = IRQ_NONE;
 177
 178         int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
 179         if (!int_type) {
 180                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
 181                 /*
 182                  * if we have a timeout error, there's nothing we can
 183                  * do besides rebooting the board. So let's BUG on any
 184                  * of such errors and handle the others. timeout error
 185                  * is severe and not expected to occur.
 186                  */
 187                 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
 188         } else {
 189                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
 190                 /* No timeout error for debug sources */
 191         }
 192
 193         /* identify the error source */
 194         err_source = __ffs(status);
 195
 196         base = l3->rt + omap3_l3_bases[int_type][err_source];
 197         error = omap3_l3_readll(base, L3_ERROR_LOG);
 198         if (error) {
 199                 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
 200                 ret |= omap3_l3_block_irq(l3, error, error_addr);
 201         }
 202
 203         /* Clear the status register */
 204         clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
 205                 L3_AGENT_STATUS_CLEAR_TA;
 206         omap3_l3_writell(base, L3_AGENT_STATUS, clear);
 207
 208         /* clear the error log register */
 209         omap3_l3_writell(base, L3_ERROR_LOG, error);
 210
 211         return ret;
 212 }
 213
 214 static int __init omap3_l3_probe(struct platform_device *pdev)
 215 {
 216         struct omap3_l3 *l3;
 217         struct resource *res;
 218         int ret;
 219
 220         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
 221         if (!l3)
 222                 return -ENOMEM;
 223
 224         platform_set_drvdata(pdev, l3);
 225
 226         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 227         if (!res) {
 228                 dev_err(&pdev->dev, "couldn't find resource\n");
 229                 ret = -ENODEV;
 230                 goto err0;
 231         }
 232         l3->rt = ioremap(res->start, resource_size(res));
 233         if (!l3->rt) {
 234                 dev_err(&pdev->dev, "ioremap failed\n");
 235                 ret = -ENOMEM;
 236                 goto err0;
 237         }
 238
 239         l3->debug_irq = platform_get_irq(pdev, 0);
 240         ret = request_irq(l3->debug_irq, omap3_l3_app_irq,
 241                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 242                 "l3-debug-irq", l3);
 243         if (ret) {
 244                 dev_err(&pdev->dev, "couldn't request debug irq\n");
 245                 goto err1;
 246         }
 247
 248         l3->app_irq = platform_get_irq(pdev, 1);
 249         ret = request_irq(l3->app_irq, omap3_l3_app_irq,
 250                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 251                 "l3-app-irq", l3);
 252         if (ret) {
 253                 dev_err(&pdev->dev, "couldn't request app irq\n");
 254                 goto err2;
 255         }
 256
 257         return 0;
 258
 259 err2:
 260         free_irq(l3->debug_irq, l3);
 261 err1:
 262         iounmap(l3->rt);
 263 err0:
 264         kfree(l3);
 265         return ret;
 266 }
 267
 268 static int __exit omap3_l3_remove(struct platform_device *pdev)
 269 {
 270         struct omap3_l3         *l3 = platform_get_drvdata(pdev);
 271
 272         free_irq(l3->app_irq, l3);
 273         free_irq(l3->debug_irq, l3);
 274         iounmap(l3->rt);
 275         kfree(l3);
 276
 277         return 0;
 278 }
 279
 280 static struct platform_driver omap3_l3_driver = {
 281         .remove         = __exit_p(omap3_l3_remove),
 282         .driver         = {
 283         .name   = "omap_l3_smx",
 284         },
 285 };
 286
 287 static int __init omap3_l3_init(void)
 288 {
 289         return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
 290 }
 291 postcore_initcall_sync(omap3_l3_init);
 292
 293 static void __exit omap3_l3_exit(void)
 294 {
 295         platform_driver_unregister(&omap3_l3_driver);
 296 }
 297 module_exit(omap3_l3_exit);