linux/drivers/bus/omap_l3_smx.c
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   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
  32static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
  33{
  34        return __raw_readll(base + reg);
  35}
  36
  37static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
  38{
  39        __raw_writell(value, base + reg);
  40}
  41
  42static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
  43{
  44        return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
  45}
  46
  47static inline u32 omap3_l3_decode_addr(u64 error_addr)
  48{
  49        return error_addr & 0xffffffff;
  50}
  51
  52static inline unsigned omap3_l3_decode_cmd(u64 error)
  53{
  54        return (error & 0x07) >> L3_ERROR_LOG_CMD;
  55}
  56
  57static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
  58{
  59        return (error & 0xff00) >> L3_ERROR_LOG_INITID;
  60}
  61
  62static inline unsigned omap3_l3_decode_req_info(u64 error)
  63{
  64        return (error >> 32) & 0xffff;
  65}
  66
  67static 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
  89static 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 */
 150static 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
 167static 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
 214static 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
 259err2:
 260        free_irq(l3->debug_irq, l3);
 261err1:
 262        iounmap(l3->rt);
 263err0:
 264        kfree(l3);
 265        return ret;
 266}
 267
 268static 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
 280static struct platform_driver omap3_l3_driver = {
 281        .remove         = __exit_p(omap3_l3_remove),
 282        .driver         = {
 283        .name   = "omap_l3_smx",
 284        },
 285};
 286
 287static int __init omap3_l3_init(void)
 288{
 289        return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
 290}
 291postcore_initcall_sync(omap3_l3_init);
 292
 293static void __exit omap3_l3_exit(void)
 294{
 295        platform_driver_unregister(&omap3_l3_driver);
 296}
 297module_exit(omap3_l3_exit);
 298
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