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 19 #include "omap_l3_smx.h" 20 21 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg) 22 { 23 return __raw_readll(base + reg); 24 } 25 26 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value) 27 { 28 __raw_writell(value, base + reg); 29 } 30 31 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error) 32 { 33 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE; 34 } 35 36 static inline u32 omap3_l3_decode_addr(u64 error_addr) 37 { 38 return error_addr & 0xffffffff; 39 } 40 41 static inline unsigned omap3_l3_decode_cmd(u64 error) 42 { 43 return (error & 0x07) >> L3_ERROR_LOG_CMD; 44 } 45 46 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error) 47 { 48 return (error & 0xff00) >> L3_ERROR_LOG_INITID; 49 } 50 51 static inline unsigned omap3_l3_decode_req_info(u64 error) 52 { 53 return (error >> 32) & 0xffff; 54 } 55 56 static char *omap3_l3_code_string(u8 code) 57 { 58 switch (code) { 59 case OMAP_L3_CODE_NOERROR: 60 return "No Error"; 61 case OMAP_L3_CODE_UNSUP_CMD: 62 return "Unsupported Command"; 63 case OMAP_L3_CODE_ADDR_HOLE: 64 return "Address Hole"; 65 case OMAP_L3_CODE_PROTECT_VIOLATION: 66 return "Protection Violation"; 67 case OMAP_L3_CODE_IN_BAND_ERR: 68 return "In-band Error"; 69 case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT: 70 return "Request Timeout Not Accepted"; 71 case OMAP_L3_CODE_REQ_TOUT_NO_RESP: 72 return "Request Timeout, no response"; 73 default: 74 return "UNKNOWN error"; 75 } 76 } 77 78 static char *omap3_l3_initiator_string(u8 initid) 79 { 80 switch (initid) { 81 case OMAP_L3_LCD: 82 return "LCD"; 83 case OMAP_L3_SAD2D: 84 return "SAD2D"; 85 case OMAP_L3_IA_MPU_SS_1: 86 case OMAP_L3_IA_MPU_SS_2: 87 case OMAP_L3_IA_MPU_SS_3: 88 case OMAP_L3_IA_MPU_SS_4: 89 case OMAP_L3_IA_MPU_SS_5: 90 return "MPU"; 91 case OMAP_L3_IA_IVA_SS_1: 92 case OMAP_L3_IA_IVA_SS_2: 93 case OMAP_L3_IA_IVA_SS_3: 94 return "IVA_SS"; 95 case OMAP_L3_IA_IVA_SS_DMA_1: 96 case OMAP_L3_IA_IVA_SS_DMA_2: 97 case OMAP_L3_IA_IVA_SS_DMA_3: 98 case OMAP_L3_IA_IVA_SS_DMA_4: 99 case OMAP_L3_IA_IVA_SS_DMA_5: 100 case OMAP_L3_IA_IVA_SS_DMA_6: 101 return "IVA_SS_DMA"; 102 case OMAP_L3_IA_SGX: 103 return "SGX"; 104 case OMAP_L3_IA_CAM_1: 105 case OMAP_L3_IA_CAM_2: 106 case OMAP_L3_IA_CAM_3: 107 return "CAM"; 108 case OMAP_L3_IA_DAP: 109 return "DAP"; 110 case OMAP_L3_SDMA_WR_1: 111 case OMAP_L3_SDMA_WR_2: 112 return "SDMA_WR"; 113 case OMAP_L3_SDMA_RD_1: 114 case OMAP_L3_SDMA_RD_2: 115 case OMAP_L3_SDMA_RD_3: 116 case OMAP_L3_SDMA_RD_4: 117 return "SDMA_RD"; 118 case OMAP_L3_USBOTG: 119 return "USB_OTG"; 120 case OMAP_L3_USBHOST: 121 return "USB_HOST"; 122 default: 123 return "UNKNOWN Initiator"; 124 } 125 } 126 127 /* 128 * omap3_l3_block_irq - handles a register block's irq 129 * @l3: struct omap3_l3 * 130 * @base: register block base address 131 * @error: L3_ERROR_LOG register of our block 132 * 133 * Called in hard-irq context. Caller should take care of locking 134 * 135 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error 136 * Analysis Sequence, we are following that sequence here, please 137 * refer to that Figure for more information on the subject. 138 */ 139 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3, 140 u64 error, int error_addr) 141 { 142 u8 code = omap3_l3_decode_error_code(error); 143 u8 initid = omap3_l3_decode_initid(error); 144 u8 multi = error & L3_ERROR_LOG_MULTI; 145 u32 address = omap3_l3_decode_addr(error_addr); 146 147 pr_err("%s seen by %s %s at address %x\n", 148 omap3_l3_code_string(code), 149 omap3_l3_initiator_string(initid), 150 multi ? "Multiple Errors" : "", address); 151 WARN_ON(1); 152 153 return IRQ_HANDLED; 154 } 155 156 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3) 157 { 158 struct omap3_l3 *l3 = _l3; 159 u64 status, clear; 160 u64 error; 161 u64 error_addr; 162 u64 err_source = 0; 163 void __iomem *base; 164 int int_type; 165 irqreturn_t ret = IRQ_NONE; 166 167 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; 168 if (!int_type) 169 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0); 170 else 171 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1); 172 173 /* identify the error source */ 174 err_source = __ffs(status); 175 176 base = l3->rt + omap3_l3_bases[int_type][err_source]; 177 error = omap3_l3_readll(base, L3_ERROR_LOG); 178 if (error) { 179 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR); 180 ret |= omap3_l3_block_irq(l3, error, error_addr); 181 } 182 183 /* 184 * if we have a timeout error, there's nothing we can 185 * do besides rebooting the board. So let's BUG on any 186 * of such errors and handle the others. timeout error 187 * is severe and not expected to occur. 188 */ 189 BUG_ON(!int_type && status & L3_STATUS_0_TIMEOUT_MASK); 190 191 /* Clear the status register */ 192 clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) | 193 L3_AGENT_STATUS_CLEAR_TA; 194 omap3_l3_writell(base, L3_AGENT_STATUS, clear); 195 196 /* clear the error log register */ 197 omap3_l3_writell(base, L3_ERROR_LOG, error); 198 199 return ret; 200 } 201 202 #if IS_BUILTIN(CONFIG_OF) 203 static const struct of_device_id omap3_l3_match[] = { 204 { 205 .compatible = "ti,omap3-l3-smx", 206 }, 207 { }, 208 }; 209 MODULE_DEVICE_TABLE(of, omap3_l3_match); 210 #endif 211 212 static int omap3_l3_probe(struct platform_device *pdev) 213 { 214 struct omap3_l3 *l3; 215 struct resource *res; 216 int ret; 217 218 l3 = kzalloc(sizeof(*l3), GFP_KERNEL); 219 if (!l3) 220 return -ENOMEM; 221 222 platform_set_drvdata(pdev, l3); 223 224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 225 if (!res) { 226 dev_err(&pdev->dev, "couldn't find resource\n"); 227 ret = -ENODEV; 228 goto err0; 229 } 230 l3->rt = ioremap(res->start, resource_size(res)); 231 if (!l3->rt) { 232 dev_err(&pdev->dev, "ioremap failed\n"); 233 ret = -ENOMEM; 234 goto err0; 235 } 236 237 l3->debug_irq = platform_get_irq(pdev, 0); 238 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 239 "l3-debug-irq", l3); 240 if (ret) { 241 dev_err(&pdev->dev, "couldn't request debug irq\n"); 242 goto err1; 243 } 244 245 l3->app_irq = platform_get_irq(pdev, 1); 246 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 247 "l3-app-irq", l3); 248 if (ret) { 249 dev_err(&pdev->dev, "couldn't request app irq\n"); 250 goto err2; 251 } 252 253 return 0; 254 255 err2: 256 free_irq(l3->debug_irq, l3); 257 err1: 258 iounmap(l3->rt); 259 err0: 260 kfree(l3); 261 return ret; 262 } 263 264 static void omap3_l3_remove(struct platform_device *pdev) 265 { 266 struct omap3_l3 *l3 = platform_get_drvdata(pdev); 267 268 free_irq(l3->app_irq, l3); 269 free_irq(l3->debug_irq, l3); 270 iounmap(l3->rt); 271 kfree(l3); 272 } 273 274 static struct platform_driver omap3_l3_driver = { 275 .probe = omap3_l3_probe, 276 .remove_new = omap3_l3_remove, 277 .driver = { 278 .name = "omap_l3_smx", 279 .of_match_table = of_match_ptr(omap3_l3_match), 280 }, 281 }; 282 283 static int __init omap3_l3_init(void) 284 { 285 return platform_driver_register(&omap3_l3_driver); 286 } 287 postcore_initcall_sync(omap3_l3_init); 288 289 static void __exit omap3_l3_exit(void) 290 { 291 platform_driver_unregister(&omap3_l3_driver); 292 } 293 module_exit(omap3_l3_exit); 294 295 MODULE_AUTHOR("Felipe Balbi"); 296 MODULE_AUTHOR("Santosh Shilimkar"); 297 MODULE_AUTHOR("Sricharan R"); 298 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver"); 299 MODULE_LICENSE("GPL"); 300