drivers/bus/omap_l3_smx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OMAP3XXX L3 Interconnect Driver
   4  *
   5  * Copyright (C) 2011 Texas Corporation
   6  *      Felipe Balbi <balbi@ti.com>
   7  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
   8  *      Sricharan <r.sricharan@ti.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19
  20 #include "omap_l3_smx.h"
  21
  22 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
  23 {
  24         return __raw_readll(base + reg);
  25 }
  26
  27 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
  28 {
  29         __raw_writell(value, base + reg);
  30 }
  31
  32 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
  33 {
  34         return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
  35 }
  36
  37 static inline u32 omap3_l3_decode_addr(u64 error_addr)
  38 {
  39         return error_addr & 0xffffffff;
  40 }
  41
  42 static inline unsigned omap3_l3_decode_cmd(u64 error)
  43 {
  44         return (error & 0x07) >> L3_ERROR_LOG_CMD;
  45 }
  46
  47 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
  48 {
  49         return (error & 0xff00) >> L3_ERROR_LOG_INITID;
  50 }
  51
  52 static inline unsigned omap3_l3_decode_req_info(u64 error)
  53 {
  54         return (error >> 32) & 0xffff;
  55 }
  56
  57 static char *omap3_l3_code_string(u8 code)
  58 {
  59         switch (code) {
  60         case OMAP_L3_CODE_NOERROR:
  61                 return "No Error";
  62         case OMAP_L3_CODE_UNSUP_CMD:
  63                 return "Unsupported Command";
  64         case OMAP_L3_CODE_ADDR_HOLE:
  65                 return "Address Hole";
  66         case OMAP_L3_CODE_PROTECT_VIOLATION:
  67                 return "Protection Violation";
  68         case OMAP_L3_CODE_IN_BAND_ERR:
  69                 return "In-band Error";
  70         case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
  71                 return "Request Timeout Not Accepted";
  72         case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
  73                 return "Request Timeout, no response";
  74         default:
  75                 return "UNKNOWN error";
  76         }
  77 }
  78
  79 static char *omap3_l3_initiator_string(u8 initid)
  80 {
  81         switch (initid) {
  82         case OMAP_L3_LCD:
  83                 return "LCD";
  84         case OMAP_L3_SAD2D:
  85                 return "SAD2D";
  86         case OMAP_L3_IA_MPU_SS_1:
  87         case OMAP_L3_IA_MPU_SS_2:
  88         case OMAP_L3_IA_MPU_SS_3:
  89         case OMAP_L3_IA_MPU_SS_4:
  90         case OMAP_L3_IA_MPU_SS_5:
  91                 return "MPU";
  92         case OMAP_L3_IA_IVA_SS_1:
  93         case OMAP_L3_IA_IVA_SS_2:
  94         case OMAP_L3_IA_IVA_SS_3:
  95                 return "IVA_SS";
  96         case OMAP_L3_IA_IVA_SS_DMA_1:
  97         case OMAP_L3_IA_IVA_SS_DMA_2:
  98         case OMAP_L3_IA_IVA_SS_DMA_3:
  99         case OMAP_L3_IA_IVA_SS_DMA_4:
 100         case OMAP_L3_IA_IVA_SS_DMA_5:
 101         case OMAP_L3_IA_IVA_SS_DMA_6:
 102                 return "IVA_SS_DMA";
 103         case OMAP_L3_IA_SGX:
 104                 return "SGX";
 105         case OMAP_L3_IA_CAM_1:
 106         case OMAP_L3_IA_CAM_2:
 107         case OMAP_L3_IA_CAM_3:
 108                 return "CAM";
 109         case OMAP_L3_IA_DAP:
 110                 return "DAP";
 111         case OMAP_L3_SDMA_WR_1:
 112         case OMAP_L3_SDMA_WR_2:
 113                 return "SDMA_WR";
 114         case OMAP_L3_SDMA_RD_1:
 115         case OMAP_L3_SDMA_RD_2:
 116         case OMAP_L3_SDMA_RD_3:
 117         case OMAP_L3_SDMA_RD_4:
 118                 return "SDMA_RD";
 119         case OMAP_L3_USBOTG:
 120                 return "USB_OTG";
 121         case OMAP_L3_USBHOST:
 122                 return "USB_HOST";
 123         default:
 124                 return "UNKNOWN Initiator";
 125         }
 126 }
 127
 128 /*
 129  * omap3_l3_block_irq - handles a register block's irq
 130  * @l3: struct omap3_l3 *
 131  * @base: register block base address
 132  * @error: L3_ERROR_LOG register of our block
 133  *
 134  * Called in hard-irq context. Caller should take care of locking
 135  *
 136  * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
 137  * Analysis Sequence, we are following that sequence here, please
 138  * refer to that Figure for more information on the subject.
 139  */
 140 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
 141                                         u64 error, int error_addr)
 142 {
 143         u8 code = omap3_l3_decode_error_code(error);
 144         u8 initid = omap3_l3_decode_initid(error);
 145         u8 multi = error & L3_ERROR_LOG_MULTI;
 146         u32 address = omap3_l3_decode_addr(error_addr);
 147
 148         pr_err("%s seen by %s %s at address %x\n",
 149                         omap3_l3_code_string(code),
 150                         omap3_l3_initiator_string(initid),
 151                         multi ? "Multiple Errors" : "", address);
 152         WARN_ON(1);
 153
 154         return IRQ_HANDLED;
 155 }
 156
 157 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
 158 {
 159         struct omap3_l3 *l3 = _l3;
 160         u64 status, clear;
 161         u64 error;
 162         u64 error_addr;
 163         u64 err_source = 0;
 164         void __iomem *base;
 165         int int_type;
 166         irqreturn_t ret = IRQ_NONE;
 167
 168         int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
 169         if (!int_type) {
 170                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
 171                 /*
 172                  * if we have a timeout error, there's nothing we can
 173                  * do besides rebooting the board. So let's BUG on any
 174                  * of such errors and handle the others. timeout error
 175                  * is severe and not expected to occur.
 176                  */
 177                 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
 178         } else {
 179                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
 180                 /* No timeout error for debug sources */
 181         }
 182
 183         /* identify the error source */
 184         err_source = __ffs(status);
 185
 186         base = l3->rt + omap3_l3_bases[int_type][err_source];
 187         error = omap3_l3_readll(base, L3_ERROR_LOG);
 188         if (error) {
 189                 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
 190                 ret |= omap3_l3_block_irq(l3, error, error_addr);
 191         }
 192
 193         /* Clear the status register */
 194         clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
 195                 L3_AGENT_STATUS_CLEAR_TA;
 196         omap3_l3_writell(base, L3_AGENT_STATUS, clear);
 197
 198         /* clear the error log register */
 199         omap3_l3_writell(base, L3_ERROR_LOG, error);
 200
 201         return ret;
 202 }
 203
 204 #if IS_BUILTIN(CONFIG_OF)
 205 static const struct of_device_id omap3_l3_match[] = {
 206         {
 207                 .compatible = "ti,omap3-l3-smx",
 208         },
 209         { },
 210 };
 211 MODULE_DEVICE_TABLE(of, omap3_l3_match);
 212 #endif
 213
 214 static int 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, IRQF_TRIGGER_RISING,
 241                           "l3-debug-irq", l3);
 242         if (ret) {
 243                 dev_err(&pdev->dev, "couldn't request debug irq\n");
 244                 goto err1;
 245         }
 246
 247         l3->app_irq = platform_get_irq(pdev, 1);
 248         ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
 249                           "l3-app-irq", l3);
 250         if (ret) {
 251                 dev_err(&pdev->dev, "couldn't request app irq\n");
 252                 goto err2;
 253         }
 254
 255         return 0;
 256
 257 err2:
 258         free_irq(l3->debug_irq, l3);
 259 err1:
 260         iounmap(l3->rt);
 261 err0:
 262         kfree(l3);
 263         return ret;
 264 }
 265
 266 static int omap3_l3_remove(struct platform_device *pdev)
 267 {
 268         struct omap3_l3         *l3 = platform_get_drvdata(pdev);
 269
 270         free_irq(l3->app_irq, l3);
 271         free_irq(l3->debug_irq, l3);
 272         iounmap(l3->rt);
 273         kfree(l3);
 274
 275         return 0;
 276 }
 277
 278 static struct platform_driver omap3_l3_driver = {
 279         .probe          = omap3_l3_probe,
 280         .remove         = omap3_l3_remove,
 281         .driver         = {
 282                 .name   = "omap_l3_smx",
 283                 .of_match_table = of_match_ptr(omap3_l3_match),
 284         },
 285 };
 286
 287 static int __init omap3_l3_init(void)
 288 {
 289         return platform_driver_register(&omap3_l3_driver);
 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);
 298
 299 MODULE_AUTHOR("Felipe Balbi");
 300 MODULE_AUTHOR("Santosh Shilimkar");
 301 MODULE_AUTHOR("Sricharan R");
 302 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");
 303 MODULE_LICENSE("GPL");