1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * OMAP3XXX L3 Interconnect Driver
5 * Copyright (C) 2011 Texas Corporation
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/interrupt.h>
16 #include <linux/module.h>
18 #include <linux/of_device.h>
20 #include "omap_l3_smx.h"
22 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
24 return __raw_readll(base + reg);
27 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
29 __raw_writell(value, base + reg);
32 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
34 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
37 static inline u32 omap3_l3_decode_addr(u64 error_addr)
39 return error_addr & 0xffffffff;
42 static inline unsigned omap3_l3_decode_cmd(u64 error)
44 return (error & 0x07) >> L3_ERROR_LOG_CMD;
47 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
49 return (error & 0xff00) >> L3_ERROR_LOG_INITID;
52 static inline unsigned omap3_l3_decode_req_info(u64 error)
54 return (error >> 32) & 0xffff;
57 static char *omap3_l3_code_string(u8 code)
60 case OMAP_L3_CODE_NOERROR:
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";
75 return "UNKNOWN error";
79 static char *omap3_l3_initiator_string(u8 initid)
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:
92 case OMAP_L3_IA_IVA_SS_1:
93 case OMAP_L3_IA_IVA_SS_2:
94 case OMAP_L3_IA_IVA_SS_3:
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:
105 case OMAP_L3_IA_CAM_1:
106 case OMAP_L3_IA_CAM_2:
107 case OMAP_L3_IA_CAM_3:
111 case OMAP_L3_SDMA_WR_1:
112 case OMAP_L3_SDMA_WR_2:
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:
121 case OMAP_L3_USBHOST:
124 return "UNKNOWN Initiator";
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
134 * Called in hard-irq context. Caller should take care of locking
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.
140 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
141 u64 error, int error_addr)
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);
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);
157 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
159 struct omap3_l3 *l3 = _l3;
166 irqreturn_t ret = IRQ_NONE;
168 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
170 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
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.
177 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
179 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
180 /* No timeout error for debug sources */
183 /* identify the error source */
184 err_source = __ffs(status);
186 base = l3->rt + omap3_l3_bases[int_type][err_source];
187 error = omap3_l3_readll(base, L3_ERROR_LOG);
189 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
190 ret |= omap3_l3_block_irq(l3, error, error_addr);
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);
198 /* clear the error log register */
199 omap3_l3_writell(base, L3_ERROR_LOG, error);
204 #if IS_BUILTIN(CONFIG_OF)
205 static const struct of_device_id omap3_l3_match[] = {
207 .compatible = "ti,omap3-l3-smx",
211 MODULE_DEVICE_TABLE(of, omap3_l3_match);
214 static int omap3_l3_probe(struct platform_device *pdev)
217 struct resource *res;
220 l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
224 platform_set_drvdata(pdev, l3);
226 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
228 dev_err(&pdev->dev, "couldn't find resource\n");
232 l3->rt = ioremap(res->start, resource_size(res));
234 dev_err(&pdev->dev, "ioremap failed\n");
239 l3->debug_irq = platform_get_irq(pdev, 0);
240 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
243 dev_err(&pdev->dev, "couldn't request debug irq\n");
247 l3->app_irq = platform_get_irq(pdev, 1);
248 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
251 dev_err(&pdev->dev, "couldn't request app irq\n");
258 free_irq(l3->debug_irq, l3);
266 static int omap3_l3_remove(struct platform_device *pdev)
268 struct omap3_l3 *l3 = platform_get_drvdata(pdev);
270 free_irq(l3->app_irq, l3);
271 free_irq(l3->debug_irq, l3);
278 static struct platform_driver omap3_l3_driver = {
279 .probe = omap3_l3_probe,
280 .remove = omap3_l3_remove,
282 .name = "omap_l3_smx",
283 .of_match_table = of_match_ptr(omap3_l3_match),
287 static int __init omap3_l3_init(void)
289 return platform_driver_register(&omap3_l3_driver);
291 postcore_initcall_sync(omap3_l3_init);
293 static void __exit omap3_l3_exit(void)
295 platform_driver_unregister(&omap3_l3_driver);
297 module_exit(omap3_l3_exit);
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");