LXR linux/drivers/bus/omap_l3

   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 <linux/module.h>
  31#include <linux/of.h>
  32#include <linux/of_device.h>
  33
  34#include "omap_l3_smx.h"
  35
  36static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
  37{
  38        return __raw_readll(base + reg);
  39}
  40
  41static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
  42{
  43        __raw_writell(value, base + reg);
  44}
  45
  46static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
  47{
  48        return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
  49}
  50
  51static inline u32 omap3_l3_decode_addr(u64 error_addr)
  52{
  53        return error_addr & 0xffffffff;
  54}
  55
  56static inline unsigned omap3_l3_decode_cmd(u64 error)
  57{
  58        return (error & 0x07) >> L3_ERROR_LOG_CMD;
  59}
  60
  61static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
  62{
  63        return (error & 0xff00) >> L3_ERROR_LOG_INITID;
  64}
  65
  66static inline unsigned omap3_l3_decode_req_info(u64 error)
  67{
  68        return (error >> 32) & 0xffff;
  69}
  70
  71static char *omap3_l3_code_string(u8 code)
  72{
  73        switch (code) {
  74        case OMAP_L3_CODE_NOERROR:
  75                return "No Error";
  76        case OMAP_L3_CODE_UNSUP_CMD:
  77                return "Unsupported Command";
  78        case OMAP_L3_CODE_ADDR_HOLE:
  79                return "Address Hole";
  80        case OMAP_L3_CODE_PROTECT_VIOLATION:
  81                return "Protection Violation";
  82        case OMAP_L3_CODE_IN_BAND_ERR:
  83                return "In-band Error";
  84        case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
  85                return "Request Timeout Not Accepted";
  86        case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
  87                return "Request Timeout, no response";
  88        default:
  89                return "UNKNOWN error";
  90        }
  91}
  92
  93static char *omap3_l3_initiator_string(u8 initid)
  94{
  95        switch (initid) {
  96        case OMAP_L3_LCD:
  97                return "LCD";
  98        case OMAP_L3_SAD2D:
  99                return "SAD2D";
 100        case OMAP_L3_IA_MPU_SS_1:
 101        case OMAP_L3_IA_MPU_SS_2:
 102        case OMAP_L3_IA_MPU_SS_3:
 103        case OMAP_L3_IA_MPU_SS_4:
 104        case OMAP_L3_IA_MPU_SS_5:
 105                return "MPU";
 106        case OMAP_L3_IA_IVA_SS_1:
 107        case OMAP_L3_IA_IVA_SS_2:
 108        case OMAP_L3_IA_IVA_SS_3:
 109                return "IVA_SS";
 110        case OMAP_L3_IA_IVA_SS_DMA_1:
 111        case OMAP_L3_IA_IVA_SS_DMA_2:
 112        case OMAP_L3_IA_IVA_SS_DMA_3:
 113        case OMAP_L3_IA_IVA_SS_DMA_4:
 114        case OMAP_L3_IA_IVA_SS_DMA_5:
 115        case OMAP_L3_IA_IVA_SS_DMA_6:
 116                return "IVA_SS_DMA";
 117        case OMAP_L3_IA_SGX:
 118                return "SGX";
 119        case OMAP_L3_IA_CAM_1:
 120        case OMAP_L3_IA_CAM_2:
 121        case OMAP_L3_IA_CAM_3:
 122                return "CAM";
 123        case OMAP_L3_IA_DAP:
 124                return "DAP";
 125        case OMAP_L3_SDMA_WR_1:
 126        case OMAP_L3_SDMA_WR_2:
 127                return "SDMA_WR";
 128        case OMAP_L3_SDMA_RD_1:
 129        case OMAP_L3_SDMA_RD_2:
 130        case OMAP_L3_SDMA_RD_3:
 131        case OMAP_L3_SDMA_RD_4:
 132                return "SDMA_RD";
 133        case OMAP_L3_USBOTG:
 134                return "USB_OTG";
 135        case OMAP_L3_USBHOST:
 136                return "USB_HOST";
 137        default:
 138                return "UNKNOWN Initiator";
 139        }
 140}
 141
 142/*
 143 * omap3_l3_block_irq - handles a register block's irq
 144 * @l3: struct omap3_l3 *
 145 * @base: register block base address
 146 * @error: L3_ERROR_LOG register of our block
 147 *
 148 * Called in hard-irq context. Caller should take care of locking
 149 *
 150 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
 151 * Analysis Sequence, we are following that sequence here, please
 152 * refer to that Figure for more information on the subject.
 153 */
 154static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
 155                                        u64 error, int error_addr)
 156{
 157        u8 code = omap3_l3_decode_error_code(error);
 158        u8 initid = omap3_l3_decode_initid(error);
 159        u8 multi = error & L3_ERROR_LOG_MULTI;
 160        u32 address = omap3_l3_decode_addr(error_addr);
 161
 162        pr_err("%s seen by %s %s at address %x\n",
 163                        omap3_l3_code_string(code),
 164                        omap3_l3_initiator_string(initid),
 165                        multi ? "Multiple Errors" : "", address);
 166        WARN_ON(1);
 167
 168        return IRQ_HANDLED;
 169}
 170
 171static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
 172{
 173        struct omap3_l3 *l3 = _l3;
 174        u64 status, clear;
 175        u64 error;
 176        u64 error_addr;
 177        u64 err_source = 0;
 178        void __iomem *base;
 179        int int_type;
 180        irqreturn_t ret = IRQ_NONE;
 181
 182        int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
 183        if (!int_type) {
 184                status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
 185                /*
 186                 * if we have a timeout error, there's nothing we can
 187                 * do besides rebooting the board. So let's BUG on any
 188                 * of such errors and handle the others. timeout error
 189                 * is severe and not expected to occur.
 190                 */
 191                BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
 192        } else {
 193                status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
 194                /* No timeout error for debug sources */
 195        }
 196
 197        /* identify the error source */
 198        err_source = __ffs(status);
 199
 200        base = l3->rt + omap3_l3_bases[int_type][err_source];
 201        error = omap3_l3_readll(base, L3_ERROR_LOG);
 202        if (error) {
 203                error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
 204                ret |= omap3_l3_block_irq(l3, error, error_addr);
 205        }
 206
 207        /* Clear the status register */
 208        clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
 209                L3_AGENT_STATUS_CLEAR_TA;
 210        omap3_l3_writell(base, L3_AGENT_STATUS, clear);
 211
 212        /* clear the error log register */
 213        omap3_l3_writell(base, L3_ERROR_LOG, error);
 214
 215        return ret;
 216}
 217
 218#if IS_BUILTIN(CONFIG_OF)
 219static const struct of_device_id omap3_l3_match[] = {
 220        {
 221                .compatible = "ti,omap3-l3-smx",
 222        },
 223        { },
 224};
 225MODULE_DEVICE_TABLE(of, omap3_l3_match);
 226#endif
 227
 228static int omap3_l3_probe(struct platform_device *pdev)
 229{
 230        struct omap3_l3 *l3;
 231        struct resource *res;
 232        int ret;
 233
 234        l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
 235        if (!l3)
 236                return -ENOMEM;
 237
 238        platform_set_drvdata(pdev, l3);
 239
 240        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 241        if (!res) {
 242                dev_err(&pdev->dev, "couldn't find resource\n");
 243                ret = -ENODEV;
 244                goto err0;
 245        }
 246        l3->rt = ioremap(res->start, resource_size(res));
 247        if (!l3->rt) {
 248                dev_err(&pdev->dev, "ioremap failed\n");
 249                ret = -ENOMEM;
 250                goto err0;
 251        }
 252
 253        l3->debug_irq = platform_get_irq(pdev, 0);
 254        ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
 255                          "l3-debug-irq", l3);
 256        if (ret) {
 257                dev_err(&pdev->dev, "couldn't request debug irq\n");
 258                goto err1;
 259        }
 260
 261        l3->app_irq = platform_get_irq(pdev, 1);
 262        ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
 263                          "l3-app-irq", l3);
 264        if (ret) {
 265                dev_err(&pdev->dev, "couldn't request app irq\n");
 266                goto err2;
 267        }
 268
 269        return 0;
 270
 271err2:
 272        free_irq(l3->debug_irq, l3);
 273err1:
 274        iounmap(l3->rt);
 275err0:
 276        kfree(l3);
 277        return ret;
 278}
 279
 280static int omap3_l3_remove(struct platform_device *pdev)
 281{
 282        struct omap3_l3         *l3 = platform_get_drvdata(pdev);
 283
 284        free_irq(l3->app_irq, l3);
 285        free_irq(l3->debug_irq, l3);
 286        iounmap(l3->rt);
 287        kfree(l3);
 288
 289        return 0;
 290}
 291
 292static struct platform_driver omap3_l3_driver = {
 293        .probe          = omap3_l3_probe,
 294        .remove         = omap3_l3_remove,
 295        .driver         = {
 296                .name   = "omap_l3_smx",
 297                .of_match_table = of_match_ptr(omap3_l3_match),
 298        },
 299};
 300
 301static int __init omap3_l3_init(void)
 302{
 303        return platform_driver_register(&omap3_l3_driver);
 304}
 305postcore_initcall_sync(omap3_l3_init);
 306
 307static void __exit omap3_l3_exit(void)
 308{
 309        platform_driver_unregister(&omap3_l3_driver);
 310}
 311module_exit(omap3_l3_exit);
 312