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Linux/drivers/bus/omap_l3_smx.c

  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 "omap_l3_smx.h"
 31 
 32 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
 33 {
 34         return __raw_readll(base + reg);
 35 }
 36 
 37 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
 38 {
 39         __raw_writell(value, base + reg);
 40 }
 41 
 42 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
 43 {
 44         return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
 45 }
 46 
 47 static inline u32 omap3_l3_decode_addr(u64 error_addr)
 48 {
 49         return error_addr & 0xffffffff;
 50 }
 51 
 52 static inline unsigned omap3_l3_decode_cmd(u64 error)
 53 {
 54         return (error & 0x07) >> L3_ERROR_LOG_CMD;
 55 }
 56 
 57 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
 58 {
 59         return (error & 0xff00) >> L3_ERROR_LOG_INITID;
 60 }
 61 
 62 static inline unsigned omap3_l3_decode_req_info(u64 error)
 63 {
 64         return (error >> 32) & 0xffff;
 65 }
 66 
 67 static char *omap3_l3_code_string(u8 code)
 68 {
 69         switch (code) {
 70         case OMAP_L3_CODE_NOERROR:
 71                 return "No Error";
 72         case OMAP_L3_CODE_UNSUP_CMD:
 73                 return "Unsupported Command";
 74         case OMAP_L3_CODE_ADDR_HOLE:
 75                 return "Address Hole";
 76         case OMAP_L3_CODE_PROTECT_VIOLATION:
 77                 return "Protection Violation";
 78         case OMAP_L3_CODE_IN_BAND_ERR:
 79                 return "In-band Error";
 80         case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
 81                 return "Request Timeout Not Accepted";
 82         case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
 83                 return "Request Timeout, no response";
 84         default:
 85                 return "UNKNOWN error";
 86         }
 87 }
 88 
 89 static char *omap3_l3_initiator_string(u8 initid)
 90 {
 91         switch (initid) {
 92         case OMAP_L3_LCD:
 93                 return "LCD";
 94         case OMAP_L3_SAD2D:
 95                 return "SAD2D";
 96         case OMAP_L3_IA_MPU_SS_1:
 97         case OMAP_L3_IA_MPU_SS_2:
 98         case OMAP_L3_IA_MPU_SS_3:
 99         case OMAP_L3_IA_MPU_SS_4:
100         case OMAP_L3_IA_MPU_SS_5:
101                 return "MPU";
102         case OMAP_L3_IA_IVA_SS_1:
103         case OMAP_L3_IA_IVA_SS_2:
104         case OMAP_L3_IA_IVA_SS_3:
105                 return "IVA_SS";
106         case OMAP_L3_IA_IVA_SS_DMA_1:
107         case OMAP_L3_IA_IVA_SS_DMA_2:
108         case OMAP_L3_IA_IVA_SS_DMA_3:
109         case OMAP_L3_IA_IVA_SS_DMA_4:
110         case OMAP_L3_IA_IVA_SS_DMA_5:
111         case OMAP_L3_IA_IVA_SS_DMA_6:
112                 return "IVA_SS_DMA";
113         case OMAP_L3_IA_SGX:
114                 return "SGX";
115         case OMAP_L3_IA_CAM_1:
116         case OMAP_L3_IA_CAM_2:
117         case OMAP_L3_IA_CAM_3:
118                 return "CAM";
119         case OMAP_L3_IA_DAP:
120                 return "DAP";
121         case OMAP_L3_SDMA_WR_1:
122         case OMAP_L3_SDMA_WR_2:
123                 return "SDMA_WR";
124         case OMAP_L3_SDMA_RD_1:
125         case OMAP_L3_SDMA_RD_2:
126         case OMAP_L3_SDMA_RD_3:
127         case OMAP_L3_SDMA_RD_4:
128                 return "SDMA_RD";
129         case OMAP_L3_USBOTG:
130                 return "USB_OTG";
131         case OMAP_L3_USBHOST:
132                 return "USB_HOST";
133         default:
134                 return "UNKNOWN Initiator";
135         }
136 }
137 
138 /*
139  * omap3_l3_block_irq - handles a register block's irq
140  * @l3: struct omap3_l3 *
141  * @base: register block base address
142  * @error: L3_ERROR_LOG register of our block
143  *
144  * Called in hard-irq context. Caller should take care of locking
145  *
146  * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
147  * Analysis Sequence, we are following that sequence here, please
148  * refer to that Figure for more information on the subject.
149  */
150 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
151                                         u64 error, int error_addr)
152 {
153         u8 code = omap3_l3_decode_error_code(error);
154         u8 initid = omap3_l3_decode_initid(error);
155         u8 multi = error & L3_ERROR_LOG_MULTI;
156         u32 address = omap3_l3_decode_addr(error_addr);
157 
158         pr_err("%s seen by %s %s at address %x\n",
159                         omap3_l3_code_string(code),
160                         omap3_l3_initiator_string(initid),
161                         multi ? "Multiple Errors" : "", address);
162         WARN_ON(1);
163 
164         return IRQ_HANDLED;
165 }
166 
167 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
168 {
169         struct omap3_l3 *l3 = _l3;
170         u64 status, clear;
171         u64 error;
172         u64 error_addr;
173         u64 err_source = 0;
174         void __iomem *base;
175         int int_type;
176         irqreturn_t ret = IRQ_NONE;
177 
178         int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
179         if (!int_type) {
180                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
181                 /*
182                  * if we have a timeout error, there's nothing we can
183                  * do besides rebooting the board. So let's BUG on any
184                  * of such errors and handle the others. timeout error
185                  * is severe and not expected to occur.
186                  */
187                 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
188         } else {
189                 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
190                 /* No timeout error for debug sources */
191         }
192 
193         /* identify the error source */
194         err_source = __ffs(status);
195 
196         base = l3->rt + omap3_l3_bases[int_type][err_source];
197         error = omap3_l3_readll(base, L3_ERROR_LOG);
198         if (error) {
199                 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
200                 ret |= omap3_l3_block_irq(l3, error, error_addr);
201         }
202 
203         /* Clear the status register */
204         clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
205                 L3_AGENT_STATUS_CLEAR_TA;
206         omap3_l3_writell(base, L3_AGENT_STATUS, clear);
207 
208         /* clear the error log register */
209         omap3_l3_writell(base, L3_ERROR_LOG, error);
210 
211         return ret;
212 }
213 
214 static int __init 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,
241                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
242                 "l3-debug-irq", l3);
243         if (ret) {
244                 dev_err(&pdev->dev, "couldn't request debug irq\n");
245                 goto err1;
246         }
247 
248         l3->app_irq = platform_get_irq(pdev, 1);
249         ret = request_irq(l3->app_irq, omap3_l3_app_irq,
250                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
251                 "l3-app-irq", l3);
252         if (ret) {
253                 dev_err(&pdev->dev, "couldn't request app irq\n");
254                 goto err2;
255         }
256 
257         return 0;
258 
259 err2:
260         free_irq(l3->debug_irq, l3);
261 err1:
262         iounmap(l3->rt);
263 err0:
264         kfree(l3);
265         return ret;
266 }
267 
268 static int __exit omap3_l3_remove(struct platform_device *pdev)
269 {
270         struct omap3_l3         *l3 = platform_get_drvdata(pdev);
271 
272         free_irq(l3->app_irq, l3);
273         free_irq(l3->debug_irq, l3);
274         iounmap(l3->rt);
275         kfree(l3);
276 
277         return 0;
278 }
279 
280 static struct platform_driver omap3_l3_driver = {
281         .remove         = __exit_p(omap3_l3_remove),
282         .driver         = {
283         .name   = "omap_l3_smx",
284         },
285 };
286 
287 static int __init omap3_l3_init(void)
288 {
289         return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
290 }
291 postcore_initcall_sync(omap3_l3_init);
292 
293 static void __exit omap3_l3_exit(void)
294 {
295         platform_driver_unregister(&omap3_l3_driver);
296 }
297 module_exit(omap3_l3_exit);
298 

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