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Linux/drivers/bus/omap_l3_noc.c

  1 /*
  2  * OMAP L3 Interconnect error handling driver
  3  *
  4  * Copyright (C) 2011-2014 Texas Instruments Incorporated - http://www.ti.com/
  5  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
  6  *      Sricharan <r.sricharan@ti.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 13  * kind, whether express or implied; without even the implied warranty
 14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  */
 17 #include <linux/init.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/io.h>
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/of_device.h>
 23 #include <linux/of.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/slab.h>
 26 
 27 #include "omap_l3_noc.h"
 28 
 29 /**
 30  * l3_handle_target() - Handle Target specific parse and reporting
 31  * @l3:         pointer to l3 struct
 32  * @base:       base address of clkdm
 33  * @flag_mux:   flagmux corresponding to the event
 34  * @err_src:    error source index of the slave (target)
 35  *
 36  * This does the second part of the error interrupt handling:
 37  *      3) Parse in the slave information
 38  *      4) Print the logged information.
 39  *      5) Add dump stack to provide kernel trace.
 40  *      6) Clear the source if known.
 41  *
 42  * This handles two types of errors:
 43  *      1) Custom errors in L3 :
 44  *              Target like DMM/FW/EMIF generates SRESP=ERR error
 45  *      2) Standard L3 error:
 46  *              - Unsupported CMD.
 47  *                      L3 tries to access target while it is idle
 48  *              - OCP disconnect.
 49  *              - Address hole error:
 50  *                      If DSS/ISS/FDIF/USBHOSTFS access a target where they
 51  *                      do not have connectivity, the error is logged in
 52  *                      their default target which is DMM2.
 53  *
 54  *      On High Secure devices, firewall errors are possible and those
 55  *      can be trapped as well. But the trapping is implemented as part
 56  *      secure software and hence need not be implemented here.
 57  */
 58 static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
 59                             struct l3_flagmux_data *flag_mux, int err_src)
 60 {
 61         int k;
 62         u32 std_err_main, clear, masterid;
 63         u8 op_code, m_req_info;
 64         void __iomem *l3_targ_base;
 65         void __iomem *l3_targ_stderr, *l3_targ_slvofslsb, *l3_targ_mstaddr;
 66         void __iomem *l3_targ_hdr, *l3_targ_info;
 67         struct l3_target_data *l3_targ_inst;
 68         struct l3_masters_data *master;
 69         char *target_name, *master_name = "UN IDENTIFIED";
 70         char *err_description;
 71         char err_string[30] = { 0 };
 72         char info_string[60] = { 0 };
 73 
 74         /* We DONOT expect err_src to go out of bounds */
 75         BUG_ON(err_src > MAX_CLKDM_TARGETS);
 76 
 77         if (err_src < flag_mux->num_targ_data) {
 78                 l3_targ_inst = &flag_mux->l3_targ[err_src];
 79                 target_name = l3_targ_inst->name;
 80                 l3_targ_base = base + l3_targ_inst->offset;
 81         } else {
 82                 target_name = L3_TARGET_NOT_SUPPORTED;
 83         }
 84 
 85         if (target_name == L3_TARGET_NOT_SUPPORTED)
 86                 return -ENODEV;
 87 
 88         /* Read the stderrlog_main_source from clk domain */
 89         l3_targ_stderr = l3_targ_base + L3_TARG_STDERRLOG_MAIN;
 90         l3_targ_slvofslsb = l3_targ_base + L3_TARG_STDERRLOG_SLVOFSLSB;
 91 
 92         std_err_main = readl_relaxed(l3_targ_stderr);
 93 
 94         switch (std_err_main & CUSTOM_ERROR) {
 95         case STANDARD_ERROR:
 96                 err_description = "Standard";
 97                 snprintf(err_string, sizeof(err_string),
 98                          ": At Address: 0x%08X ",
 99                          readl_relaxed(l3_targ_slvofslsb));
100 
101                 l3_targ_mstaddr = l3_targ_base + L3_TARG_STDERRLOG_MSTADDR;
102                 l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_HDR;
103                 l3_targ_info = l3_targ_base + L3_TARG_STDERRLOG_INFO;
104                 break;
105 
106         case CUSTOM_ERROR:
107                 err_description = "Custom";
108 
109                 l3_targ_mstaddr = l3_targ_base +
110                                   L3_TARG_STDERRLOG_CINFO_MSTADDR;
111                 l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_CINFO_OPCODE;
112                 l3_targ_info = l3_targ_base + L3_TARG_STDERRLOG_CINFO_INFO;
113                 break;
114 
115         default:
116                 /* Nothing to be handled here as of now */
117                 return 0;
118         }
119 
120         /* STDERRLOG_MSTADDR Stores the NTTP master address. */
121         masterid = (readl_relaxed(l3_targ_mstaddr) &
122                     l3->mst_addr_mask) >> __ffs(l3->mst_addr_mask);
123 
124         for (k = 0, master = l3->l3_masters; k < l3->num_masters;
125              k++, master++) {
126                 if (masterid == master->id) {
127                         master_name = master->name;
128                         break;
129                 }
130         }
131 
132         op_code = readl_relaxed(l3_targ_hdr) & 0x7;
133 
134         m_req_info = readl_relaxed(l3_targ_info) & 0xF;
135         snprintf(info_string, sizeof(info_string),
136                  ": %s in %s mode during %s access",
137                  (m_req_info & BIT(0)) ? "Opcode Fetch" : "Data Access",
138                  (m_req_info & BIT(1)) ? "Supervisor" : "User",
139                  (m_req_info & BIT(3)) ? "Debug" : "Functional");
140 
141         WARN(true,
142              "%s:L3 %s Error: MASTER %s TARGET %s (%s)%s%s\n",
143              dev_name(l3->dev),
144              err_description,
145              master_name, target_name,
146              l3_transaction_type[op_code],
147              err_string, info_string);
148 
149         /* clear the std error log*/
150         clear = std_err_main | CLEAR_STDERR_LOG;
151         writel_relaxed(clear, l3_targ_stderr);
152 
153         return 0;
154 }
155 
156 /**
157  * l3_interrupt_handler() - interrupt handler for l3 events
158  * @irq:        irq number
159  * @_l3:        pointer to l3 structure
160  *
161  * Interrupt Handler for L3 error detection.
162  *      1) Identify the L3 clockdomain partition to which the error belongs to.
163  *      2) Identify the slave where the error information is logged
164  *      ... handle the slave event..
165  *      7) if the slave is unknown, mask out the slave.
166  */
167 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
168 {
169         struct omap_l3 *l3 = _l3;
170         int inttype, i, ret;
171         int err_src = 0;
172         u32 err_reg, mask_val;
173         void __iomem *base, *mask_reg;
174         struct l3_flagmux_data *flag_mux;
175 
176         /* Get the Type of interrupt */
177         inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
178 
179         for (i = 0; i < l3->num_modules; i++) {
180                 /*
181                  * Read the regerr register of the clock domain
182                  * to determine the source
183                  */
184                 base = l3->l3_base[i];
185                 flag_mux = l3->l3_flagmux[i];
186                 err_reg = readl_relaxed(base + flag_mux->offset +
187                                         L3_FLAGMUX_REGERR0 + (inttype << 3));
188 
189                 err_reg &= ~(inttype ? flag_mux->mask_app_bits :
190                                 flag_mux->mask_dbg_bits);
191 
192                 /* Get the corresponding error and analyse */
193                 if (err_reg) {
194                         /* Identify the source from control status register */
195                         err_src = __ffs(err_reg);
196 
197                         ret = l3_handle_target(l3, base, flag_mux, err_src);
198 
199                         /*
200                          * Certain plaforms may have "undocumented" status
201                          * pending on boot. So dont generate a severe warning
202                          * here. Just mask it off to prevent the error from
203                          * reoccuring and locking up the system.
204                          */
205                         if (ret) {
206                                 dev_err(l3->dev,
207                                         "L3 %s error: target %d mod:%d %s\n",
208                                         inttype ? "debug" : "application",
209                                         err_src, i, "(unclearable)");
210 
211                                 mask_reg = base + flag_mux->offset +
212                                            L3_FLAGMUX_MASK0 + (inttype << 3);
213                                 mask_val = readl_relaxed(mask_reg);
214                                 mask_val &= ~(1 << err_src);
215                                 writel_relaxed(mask_val, mask_reg);
216 
217                                 /* Mark these bits as to be ignored */
218                                 if (inttype)
219                                         flag_mux->mask_app_bits |= 1 << err_src;
220                                 else
221                                         flag_mux->mask_dbg_bits |= 1 << err_src;
222                         }
223 
224                         /* Error found so break the for loop */
225                         break;
226                 }
227         }
228         return IRQ_HANDLED;
229 }
230 
231 static const struct of_device_id l3_noc_match[] = {
232         {.compatible = "ti,omap4-l3-noc", .data = &omap_l3_data},
233         {.compatible = "ti,dra7-l3-noc", .data = &dra_l3_data},
234         {.compatible = "ti,am4372-l3-noc", .data = &am4372_l3_data},
235         {},
236 };
237 MODULE_DEVICE_TABLE(of, l3_noc_match);
238 
239 static int omap_l3_probe(struct platform_device *pdev)
240 {
241         const struct of_device_id *of_id;
242         static struct omap_l3 *l3;
243         int ret, i, res_idx;
244 
245         of_id = of_match_device(l3_noc_match, &pdev->dev);
246         if (!of_id) {
247                 dev_err(&pdev->dev, "OF data missing\n");
248                 return -EINVAL;
249         }
250 
251         l3 = devm_kzalloc(&pdev->dev, sizeof(*l3), GFP_KERNEL);
252         if (!l3)
253                 return -ENOMEM;
254 
255         memcpy(l3, of_id->data, sizeof(*l3));
256         l3->dev = &pdev->dev;
257         platform_set_drvdata(pdev, l3);
258 
259         /* Get mem resources */
260         for (i = 0, res_idx = 0; i < l3->num_modules; i++) {
261                 struct resource *res;
262 
263                 if (l3->l3_base[i] == L3_BASE_IS_SUBMODULE) {
264                         /* First entry cannot be submodule */
265                         BUG_ON(i == 0);
266                         l3->l3_base[i] = l3->l3_base[i - 1];
267                         continue;
268                 }
269                 res = platform_get_resource(pdev, IORESOURCE_MEM, res_idx);
270                 l3->l3_base[i] = devm_ioremap_resource(&pdev->dev, res);
271                 if (IS_ERR(l3->l3_base[i])) {
272                         dev_err(l3->dev, "ioremap %d failed\n", i);
273                         return PTR_ERR(l3->l3_base[i]);
274                 }
275                 res_idx++;
276         }
277 
278         /*
279          * Setup interrupt Handlers
280          */
281         l3->debug_irq = platform_get_irq(pdev, 0);
282         ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler,
283                                IRQF_DISABLED, "l3-dbg-irq", l3);
284         if (ret) {
285                 dev_err(l3->dev, "request_irq failed for %d\n",
286                         l3->debug_irq);
287                 return ret;
288         }
289 
290         l3->app_irq = platform_get_irq(pdev, 1);
291         ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler,
292                                IRQF_DISABLED, "l3-app-irq", l3);
293         if (ret)
294                 dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq);
295 
296         return ret;
297 }
298 
299 static struct platform_driver omap_l3_driver = {
300         .probe          = omap_l3_probe,
301         .driver         = {
302                 .name           = "omap_l3_noc",
303                 .owner          = THIS_MODULE,
304                 .of_match_table = of_match_ptr(l3_noc_match),
305         },
306 };
307 
308 static int __init omap_l3_init(void)
309 {
310         return platform_driver_register(&omap_l3_driver);
311 }
312 postcore_initcall_sync(omap_l3_init);
313 
314 static void __exit omap_l3_exit(void)
315 {
316         platform_driver_unregister(&omap_l3_driver);
317 }
318 module_exit(omap_l3_exit);
319 

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