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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OMAP3XXX L3 Interconnect Driver4 *5 * Copyright (C) 2011 Texas Corporation6 * 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 21static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)22{23 return __raw_readll(base + reg);24}25 26static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)27{28 __raw_writell(value, base + reg);29}30 31static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)32{33 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;34}35 36static inline u32 omap3_l3_decode_addr(u64 error_addr)37{38 return error_addr & 0xffffffff;39}40 41static inline unsigned omap3_l3_decode_cmd(u64 error)42{43 return (error & 0x07) >> L3_ERROR_LOG_CMD;44}45 46static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)47{48 return (error & 0xff00) >> L3_ERROR_LOG_INITID;49}50 51static inline unsigned omap3_l3_decode_req_info(u64 error)52{53 return (error >> 32) & 0xffff;54}55 56static 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 78static 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 irq129 * @l3: struct omap3_l3 *130 * @base: register block base address131 * @error: L3_ERROR_LOG register of our block132 *133 * Called in hard-irq context. Caller should take care of locking134 *135 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error136 * Analysis Sequence, we are following that sequence here, please137 * refer to that Figure for more information on the subject.138 */139static 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 156static 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 else171 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 can185 * do besides rebooting the board. So let's BUG on any186 * of such errors and handle the others. timeout error187 * 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)203static const struct of_device_id omap3_l3_match[] = {204 {205 .compatible = "ti,omap3-l3-smx",206 },207 { },208};209MODULE_DEVICE_TABLE(of, omap3_l3_match);210#endif211 212static 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 255err2:256 free_irq(l3->debug_irq, l3);257err1:258 iounmap(l3->rt);259err0:260 kfree(l3);261 return ret;262}263 264static 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 274static 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 283static int __init omap3_l3_init(void)284{285 return platform_driver_register(&omap3_l3_driver);286}287postcore_initcall_sync(omap3_l3_init);288 289static void __exit omap3_l3_exit(void)290{291 platform_driver_unregister(&omap3_l3_driver);292}293module_exit(omap3_l3_exit);294 295MODULE_AUTHOR("Felipe Balbi");296MODULE_AUTHOR("Santosh Shilimkar");297MODULE_AUTHOR("Sricharan R");298MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");299MODULE_LICENSE("GPL");300