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
omap3_l3_readll(void __iomem * base,u16 reg)22 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
23 {
24 return __raw_readll(base + reg);
25 }
26
omap3_l3_writell(void __iomem * base,u16 reg,u64 value)27 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
28 {
29 __raw_writell(value, base + reg);
30 }
31
omap3_l3_decode_error_code(u64 error)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
omap3_l3_decode_addr(u64 error_addr)37 static inline u32 omap3_l3_decode_addr(u64 error_addr)
38 {
39 return error_addr & 0xffffffff;
40 }
41
omap3_l3_decode_cmd(u64 error)42 static inline unsigned omap3_l3_decode_cmd(u64 error)
43 {
44 return (error & 0x07) >> L3_ERROR_LOG_CMD;
45 }
46
omap3_l3_decode_initid(u64 error)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
omap3_l3_decode_req_info(u64 error)52 static inline unsigned omap3_l3_decode_req_info(u64 error)
53 {
54 return (error >> 32) & 0xffff;
55 }
56
omap3_l3_code_string(u8 code)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
omap3_l3_initiator_string(u8 initid)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 */
omap3_l3_block_irq(struct omap3_l3 * l3,u64 error,int error_addr)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
omap3_l3_app_irq(int irq,void * _l3)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
omap3_l3_probe(struct platform_device * pdev)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
omap3_l3_remove(struct platform_device * pdev)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
omap3_l3_init(void)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
omap3_l3_exit(void)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");
304