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); 298