1 /*
2 * OMAP3XXX L3 Interconnect Driver
3 *
4 * Copyright (C) 2011 Texas Corporation
5 * Felipe Balbi <balbi@ti.com>
6 * Santosh Shilimkar <santosh.shilimkar@ti.com>
7 * Sricharan <r.sricharan@ti.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/platform_device.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/module.h>
31 #include <linux/of.h>
32 #include <linux/of_device.h>
33
34 #include "omap_l3_smx.h"
35
omap3_l3_readll(void __iomem * base,u16 reg)36 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
37 {
38 return __raw_readll(base + reg);
39 }
40
omap3_l3_writell(void __iomem * base,u16 reg,u64 value)41 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
42 {
43 __raw_writell(value, base + reg);
44 }
45
omap3_l3_decode_error_code(u64 error)46 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
47 {
48 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
49 }
50
omap3_l3_decode_addr(u64 error_addr)51 static inline u32 omap3_l3_decode_addr(u64 error_addr)
52 {
53 return error_addr & 0xffffffff;
54 }
55
omap3_l3_decode_cmd(u64 error)56 static inline unsigned omap3_l3_decode_cmd(u64 error)
57 {
58 return (error & 0x07) >> L3_ERROR_LOG_CMD;
59 }
60
omap3_l3_decode_initid(u64 error)61 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
62 {
63 return (error & 0xff00) >> L3_ERROR_LOG_INITID;
64 }
65
omap3_l3_decode_req_info(u64 error)66 static inline unsigned omap3_l3_decode_req_info(u64 error)
67 {
68 return (error >> 32) & 0xffff;
69 }
70
omap3_l3_code_string(u8 code)71 static char *omap3_l3_code_string(u8 code)
72 {
73 switch (code) {
74 case OMAP_L3_CODE_NOERROR:
75 return "No Error";
76 case OMAP_L3_CODE_UNSUP_CMD:
77 return "Unsupported Command";
78 case OMAP_L3_CODE_ADDR_HOLE:
79 return "Address Hole";
80 case OMAP_L3_CODE_PROTECT_VIOLATION:
81 return "Protection Violation";
82 case OMAP_L3_CODE_IN_BAND_ERR:
83 return "In-band Error";
84 case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
85 return "Request Timeout Not Accepted";
86 case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
87 return "Request Timeout, no response";
88 default:
89 return "UNKNOWN error";
90 }
91 }
92
omap3_l3_initiator_string(u8 initid)93 static char *omap3_l3_initiator_string(u8 initid)
94 {
95 switch (initid) {
96 case OMAP_L3_LCD:
97 return "LCD";
98 case OMAP_L3_SAD2D:
99 return "SAD2D";
100 case OMAP_L3_IA_MPU_SS_1:
101 case OMAP_L3_IA_MPU_SS_2:
102 case OMAP_L3_IA_MPU_SS_3:
103 case OMAP_L3_IA_MPU_SS_4:
104 case OMAP_L3_IA_MPU_SS_5:
105 return "MPU";
106 case OMAP_L3_IA_IVA_SS_1:
107 case OMAP_L3_IA_IVA_SS_2:
108 case OMAP_L3_IA_IVA_SS_3:
109 return "IVA_SS";
110 case OMAP_L3_IA_IVA_SS_DMA_1:
111 case OMAP_L3_IA_IVA_SS_DMA_2:
112 case OMAP_L3_IA_IVA_SS_DMA_3:
113 case OMAP_L3_IA_IVA_SS_DMA_4:
114 case OMAP_L3_IA_IVA_SS_DMA_5:
115 case OMAP_L3_IA_IVA_SS_DMA_6:
116 return "IVA_SS_DMA";
117 case OMAP_L3_IA_SGX:
118 return "SGX";
119 case OMAP_L3_IA_CAM_1:
120 case OMAP_L3_IA_CAM_2:
121 case OMAP_L3_IA_CAM_3:
122 return "CAM";
123 case OMAP_L3_IA_DAP:
124 return "DAP";
125 case OMAP_L3_SDMA_WR_1:
126 case OMAP_L3_SDMA_WR_2:
127 return "SDMA_WR";
128 case OMAP_L3_SDMA_RD_1:
129 case OMAP_L3_SDMA_RD_2:
130 case OMAP_L3_SDMA_RD_3:
131 case OMAP_L3_SDMA_RD_4:
132 return "SDMA_RD";
133 case OMAP_L3_USBOTG:
134 return "USB_OTG";
135 case OMAP_L3_USBHOST:
136 return "USB_HOST";
137 default:
138 return "UNKNOWN Initiator";
139 }
140 }
141
142 /*
143 * omap3_l3_block_irq - handles a register block's irq
144 * @l3: struct omap3_l3 *
145 * @base: register block base address
146 * @error: L3_ERROR_LOG register of our block
147 *
148 * Called in hard-irq context. Caller should take care of locking
149 *
150 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
151 * Analysis Sequence, we are following that sequence here, please
152 * refer to that Figure for more information on the subject.
153 */
omap3_l3_block_irq(struct omap3_l3 * l3,u64 error,int error_addr)154 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
155 u64 error, int error_addr)
156 {
157 u8 code = omap3_l3_decode_error_code(error);
158 u8 initid = omap3_l3_decode_initid(error);
159 u8 multi = error & L3_ERROR_LOG_MULTI;
160 u32 address = omap3_l3_decode_addr(error_addr);
161
162 pr_err("%s seen by %s %s at address %x\n",
163 omap3_l3_code_string(code),
164 omap3_l3_initiator_string(initid),
165 multi ? "Multiple Errors" : "", address);
166 WARN_ON(1);
167
168 return IRQ_HANDLED;
169 }
170
omap3_l3_app_irq(int irq,void * _l3)171 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
172 {
173 struct omap3_l3 *l3 = _l3;
174 u64 status, clear;
175 u64 error;
176 u64 error_addr;
177 u64 err_source = 0;
178 void __iomem *base;
179 int int_type;
180 irqreturn_t ret = IRQ_NONE;
181
182 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
183 if (!int_type) {
184 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
185 /*
186 * if we have a timeout error, there's nothing we can
187 * do besides rebooting the board. So let's BUG on any
188 * of such errors and handle the others. timeout error
189 * is severe and not expected to occur.
190 */
191 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
192 } else {
193 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
194 /* No timeout error for debug sources */
195 }
196
197 /* identify the error source */
198 err_source = __ffs(status);
199
200 base = l3->rt + omap3_l3_bases[int_type][err_source];
201 error = omap3_l3_readll(base, L3_ERROR_LOG);
202 if (error) {
203 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
204 ret |= omap3_l3_block_irq(l3, error, error_addr);
205 }
206
207 /* Clear the status register */
208 clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
209 L3_AGENT_STATUS_CLEAR_TA;
210 omap3_l3_writell(base, L3_AGENT_STATUS, clear);
211
212 /* clear the error log register */
213 omap3_l3_writell(base, L3_ERROR_LOG, error);
214
215 return ret;
216 }
217
218 #if IS_BUILTIN(CONFIG_OF)
219 static const struct of_device_id omap3_l3_match[] = {
220 {
221 .compatible = "ti,omap3-l3-smx",
222 },
223 { },
224 };
225 MODULE_DEVICE_TABLE(of, omap3_l3_match);
226 #endif
227
omap3_l3_probe(struct platform_device * pdev)228 static int omap3_l3_probe(struct platform_device *pdev)
229 {
230 struct omap3_l3 *l3;
231 struct resource *res;
232 int ret;
233
234 l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
235 if (!l3)
236 return -ENOMEM;
237
238 platform_set_drvdata(pdev, l3);
239
240 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
241 if (!res) {
242 dev_err(&pdev->dev, "couldn't find resource\n");
243 ret = -ENODEV;
244 goto err0;
245 }
246 l3->rt = ioremap(res->start, resource_size(res));
247 if (!l3->rt) {
248 dev_err(&pdev->dev, "ioremap failed\n");
249 ret = -ENOMEM;
250 goto err0;
251 }
252
253 l3->debug_irq = platform_get_irq(pdev, 0);
254 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
255 "l3-debug-irq", l3);
256 if (ret) {
257 dev_err(&pdev->dev, "couldn't request debug irq\n");
258 goto err1;
259 }
260
261 l3->app_irq = platform_get_irq(pdev, 1);
262 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
263 "l3-app-irq", l3);
264 if (ret) {
265 dev_err(&pdev->dev, "couldn't request app irq\n");
266 goto err2;
267 }
268
269 return 0;
270
271 err2:
272 free_irq(l3->debug_irq, l3);
273 err1:
274 iounmap(l3->rt);
275 err0:
276 kfree(l3);
277 return ret;
278 }
279
omap3_l3_remove(struct platform_device * pdev)280 static int omap3_l3_remove(struct platform_device *pdev)
281 {
282 struct omap3_l3 *l3 = platform_get_drvdata(pdev);
283
284 free_irq(l3->app_irq, l3);
285 free_irq(l3->debug_irq, l3);
286 iounmap(l3->rt);
287 kfree(l3);
288
289 return 0;
290 }
291
292 static struct platform_driver omap3_l3_driver = {
293 .probe = omap3_l3_probe,
294 .remove = omap3_l3_remove,
295 .driver = {
296 .name = "omap_l3_smx",
297 .of_match_table = of_match_ptr(omap3_l3_match),
298 },
299 };
300
omap3_l3_init(void)301 static int __init omap3_l3_init(void)
302 {
303 return platform_driver_register(&omap3_l3_driver);
304 }
305 postcore_initcall_sync(omap3_l3_init);
306
omap3_l3_exit(void)307 static void __exit omap3_l3_exit(void)
308 {
309 platform_driver_unregister(&omap3_l3_driver);
310 }
311 module_exit(omap3_l3_exit);
312