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
omap3_l3_readll(void __iomem * base,u16 reg)21 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
22 {
23 return __raw_readll(base + reg);
24 }
25
omap3_l3_writell(void __iomem * base,u16 reg,u64 value)26 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
27 {
28 __raw_writell(value, base + reg);
29 }
30
omap3_l3_decode_error_code(u64 error)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
omap3_l3_decode_addr(u64 error_addr)36 static inline u32 omap3_l3_decode_addr(u64 error_addr)
37 {
38 return error_addr & 0xffffffff;
39 }
40
omap3_l3_decode_cmd(u64 error)41 static inline unsigned omap3_l3_decode_cmd(u64 error)
42 {
43 return (error & 0x07) >> L3_ERROR_LOG_CMD;
44 }
45
omap3_l3_decode_initid(u64 error)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
omap3_l3_decode_req_info(u64 error)51 static inline unsigned omap3_l3_decode_req_info(u64 error)
52 {
53 return (error >> 32) & 0xffff;
54 }
55
omap3_l3_code_string(u8 code)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
omap3_l3_initiator_string(u8 initid)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 */
omap3_l3_block_irq(struct omap3_l3 * l3,u64 error,int error_addr)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
omap3_l3_app_irq(int irq,void * _l3)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
omap3_l3_probe(struct platform_device * pdev)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
omap3_l3_remove(struct platform_device * pdev)264 static int 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 return 0;
274 }
275
276 static struct platform_driver omap3_l3_driver = {
277 .probe = omap3_l3_probe,
278 .remove = omap3_l3_remove,
279 .driver = {
280 .name = "omap_l3_smx",
281 .of_match_table = of_match_ptr(omap3_l3_match),
282 },
283 };
284
omap3_l3_init(void)285 static int __init omap3_l3_init(void)
286 {
287 return platform_driver_register(&omap3_l3_driver);
288 }
289 postcore_initcall_sync(omap3_l3_init);
290
omap3_l3_exit(void)291 static void __exit omap3_l3_exit(void)
292 {
293 platform_driver_unregister(&omap3_l3_driver);
294 }
295 module_exit(omap3_l3_exit);
296
297 MODULE_AUTHOR("Felipe Balbi");
298 MODULE_AUTHOR("Santosh Shilimkar");
299 MODULE_AUTHOR("Sricharan R");
300 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");
301 MODULE_LICENSE("GPL");
302