2 * OMAP L3 Interconnect error handling driver
4 * Copyright (C) 2011-2015 Texas Instruments Incorporated - http://www.ti.com/
5 * Santosh Shilimkar <santosh.shilimkar@ti.com>
6 * Sricharan <r.sricharan@ti.com>
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.
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.
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/of_device.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
27 #include "omap_l3_noc.h"
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)
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.
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:
47 * L3 tries to access target while it is idle
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.
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.
58 static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
59 struct l3_flagmux_data *flag_mux, int err_src)
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 };
74 /* We DONOT expect err_src to go out of bounds */
75 BUG_ON(err_src > MAX_CLKDM_TARGETS);
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;
82 target_name = L3_TARGET_NOT_SUPPORTED;
85 if (target_name == L3_TARGET_NOT_SUPPORTED)
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;
92 std_err_main = readl_relaxed(l3_targ_stderr);
94 switch (std_err_main & CUSTOM_ERROR) {
96 err_description = "Standard";
97 snprintf(err_string, sizeof(err_string),
98 ": At Address: 0x%08X ",
99 readl_relaxed(l3_targ_slvofslsb));
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;
107 err_description = "Custom";
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;
116 /* Nothing to be handled here as of now */
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);
124 for (k = 0, master = l3->l3_masters; k < l3->num_masters;
126 if (masterid == master->id) {
127 master_name = master->name;
132 op_code = readl_relaxed(l3_targ_hdr) & 0x7;
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");
142 "%s:L3 %s Error: MASTER %s TARGET %s (%s)%s%s\n",
145 master_name, target_name,
146 l3_transaction_type[op_code],
147 err_string, info_string);
149 /* clear the std error log*/
150 clear = std_err_main | CLEAR_STDERR_LOG;
151 writel_relaxed(clear, l3_targ_stderr);
157 * l3_interrupt_handler() - interrupt handler for l3 events
159 * @_l3: pointer to l3 structure
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.
167 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
169 struct omap_l3 *l3 = _l3;
172 u32 err_reg, mask_val;
173 void __iomem *base, *mask_reg;
174 struct l3_flagmux_data *flag_mux;
176 /* Get the Type of interrupt */
177 inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
179 for (i = 0; i < l3->num_modules; i++) {
181 * Read the regerr register of the clock domain
182 * to determine the source
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));
189 err_reg &= ~(inttype ? flag_mux->mask_app_bits :
190 flag_mux->mask_dbg_bits);
192 /* Get the corresponding error and analyse */
194 /* Identify the source from control status register */
195 err_src = __ffs(err_reg);
197 ret = l3_handle_target(l3, base, flag_mux, err_src);
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.
207 "L3 %s error: target %d mod:%d %s\n",
208 inttype ? "debug" : "application",
209 err_src, i, "(unclearable)");
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);
217 /* Mark these bits as to be ignored */
219 flag_mux->mask_app_bits |= 1 << err_src;
221 flag_mux->mask_dbg_bits |= 1 << err_src;
224 /* Error found so break the for loop */
229 dev_err(l3->dev, "L3 %s IRQ not handled!!\n",
230 inttype ? "debug" : "application");
235 static const struct of_device_id l3_noc_match[] = {
236 {.compatible = "ti,omap4-l3-noc", .data = &omap4_l3_data},
237 {.compatible = "ti,omap5-l3-noc", .data = &omap5_l3_data},
238 {.compatible = "ti,dra7-l3-noc", .data = &dra_l3_data},
239 {.compatible = "ti,am4372-l3-noc", .data = &am4372_l3_data},
242 MODULE_DEVICE_TABLE(of, l3_noc_match);
244 static int omap_l3_probe(struct platform_device *pdev)
246 const struct of_device_id *of_id;
247 static struct omap_l3 *l3;
250 of_id = of_match_device(l3_noc_match, &pdev->dev);
252 dev_err(&pdev->dev, "OF data missing\n");
256 l3 = devm_kzalloc(&pdev->dev, sizeof(*l3), GFP_KERNEL);
260 memcpy(l3, of_id->data, sizeof(*l3));
261 l3->dev = &pdev->dev;
262 platform_set_drvdata(pdev, l3);
264 /* Get mem resources */
265 for (i = 0, res_idx = 0; i < l3->num_modules; i++) {
266 struct resource *res;
268 if (l3->l3_base[i] == L3_BASE_IS_SUBMODULE) {
269 /* First entry cannot be submodule */
271 l3->l3_base[i] = l3->l3_base[i - 1];
274 res = platform_get_resource(pdev, IORESOURCE_MEM, res_idx);
275 l3->l3_base[i] = devm_ioremap_resource(&pdev->dev, res);
276 if (IS_ERR(l3->l3_base[i])) {
277 dev_err(l3->dev, "ioremap %d failed\n", i);
278 return PTR_ERR(l3->l3_base[i]);
284 * Setup interrupt Handlers
286 l3->debug_irq = platform_get_irq(pdev, 0);
287 ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler,
288 IRQF_NO_THREAD, "l3-dbg-irq", l3);
290 dev_err(l3->dev, "request_irq failed for %d\n",
295 l3->app_irq = platform_get_irq(pdev, 1);
296 ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler,
297 IRQF_NO_THREAD, "l3-app-irq", l3);
299 dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq);
304 #ifdef CONFIG_PM_SLEEP
307 * l3_resume_noirq() - resume function for l3_noc
308 * @dev: pointer to l3_noc device structure
310 * We only have the resume handler only since we
311 * have already maintained the delta register
312 * configuration as part of configuring the system
314 static int l3_resume_noirq(struct device *dev)
316 struct omap_l3 *l3 = dev_get_drvdata(dev);
318 struct l3_flagmux_data *flag_mux;
319 void __iomem *base, *mask_regx = NULL;
322 for (i = 0; i < l3->num_modules; i++) {
323 base = l3->l3_base[i];
324 flag_mux = l3->l3_flagmux[i];
325 if (!flag_mux->mask_app_bits && !flag_mux->mask_dbg_bits)
328 mask_regx = base + flag_mux->offset + L3_FLAGMUX_MASK0 +
329 (L3_APPLICATION_ERROR << 3);
330 mask_val = readl_relaxed(mask_regx);
331 mask_val &= ~(flag_mux->mask_app_bits);
333 writel_relaxed(mask_val, mask_regx);
334 mask_regx = base + flag_mux->offset + L3_FLAGMUX_MASK0 +
335 (L3_DEBUG_ERROR << 3);
336 mask_val = readl_relaxed(mask_regx);
337 mask_val &= ~(flag_mux->mask_dbg_bits);
339 writel_relaxed(mask_val, mask_regx);
342 /* Dummy read to force OCP barrier */
344 (void)readl(mask_regx);
349 static const struct dev_pm_ops l3_dev_pm_ops = {
350 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, l3_resume_noirq)
353 #define L3_DEV_PM_OPS (&l3_dev_pm_ops)
355 #define L3_DEV_PM_OPS NULL
358 static struct platform_driver omap_l3_driver = {
359 .probe = omap_l3_probe,
361 .name = "omap_l3_noc",
363 .of_match_table = of_match_ptr(l3_noc_match),
367 static int __init omap_l3_init(void)
369 return platform_driver_register(&omap_l3_driver);
371 postcore_initcall_sync(omap_l3_init);
373 static void __exit omap_l3_exit(void)
375 platform_driver_unregister(&omap_l3_driver);
377 module_exit(omap_l3_exit);
379 MODULE_AUTHOR("Santosh Shilimkar");
380 MODULE_AUTHOR("Sricharan R");
381 MODULE_DESCRIPTION("OMAP L3 Interconnect error handling driver");
382 MODULE_LICENSE("GPL v2");