2 * OMAP4XXX L3 Interconnect error handling driver
4 * Copyright (C) 2011 Texas Corporation
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 as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 #include <linux/init.h>
25 #include <linux/platform_device.h>
26 #include <linux/interrupt.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
30 #include "omap_l3_noc.h"
33 * Interrupt Handler for L3 error detection.
34 * 1) Identify the L3 clockdomain partition to which the error belongs to.
35 * 2) Identify the slave where the error information is logged
36 * 3) Print the logged information.
37 * 4) Add dump stack to provide kernel trace.
39 * Two Types of errors :
40 * 1) Custom errors in L3 :
41 * Target like DMM/FW/EMIF generates SRESP=ERR error
42 * 2) Standard L3 error:
44 * L3 tries to access target while it is idle
46 * - Address hole error:
47 * If DSS/ISS/FDIF/USBHOSTFS access a target where they
48 * do not have connectivity, the error is logged in
49 * their default target which is DMM2.
51 * On High Secure devices, firewall errors are possible and those
52 * can be trapped as well. But the trapping is implemented as part
53 * secure software and hence need not be implemented here.
55 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
58 struct omap4_l3 *l3 = _l3;
61 u32 std_err_main_addr, std_err_main, err_reg;
62 u32 base, slave_addr, clear;
65 /* Get the Type of interrupt */
66 if (irq == l3->app_irq)
67 inttype = L3_APPLICATION_ERROR;
69 inttype = L3_DEBUG_ERROR;
71 for (i = 0; i < L3_MODULES; i++) {
73 * Read the regerr register of the clock domain
74 * to determine the source
76 base = (u32)l3->l3_base[i];
77 err_reg = readl(base + l3_flagmux[i] + (inttype << 3));
79 /* Get the corresponding error and analyse */
81 /* Identify the source from control status register */
82 for (j = 0; !(err_reg & (1 << j)); j++)
86 /* Read the stderrlog_main_source from clk domain */
87 std_err_main_addr = base + (*(l3_targ[i] + err_src));
88 std_err_main = readl(std_err_main_addr);
90 switch ((std_err_main & CUSTOM_ERROR)) {
93 l3_targ_stderrlog_main_name[i][err_src];
95 slave_addr = std_err_main_addr +
96 L3_SLAVE_ADDRESS_OFFSET;
97 WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n",
98 source_name, readl(slave_addr));
99 /* clear the std error log*/
100 clear = std_err_main | CLEAR_STDERR_LOG;
101 writel(clear, std_err_main_addr);
106 l3_targ_stderrlog_main_name[i][err_src];
108 WARN(true, "CUSTOM SRESP error with SOURCE:%s\n",
110 /* clear the std error log*/
111 clear = std_err_main | CLEAR_STDERR_LOG;
112 writel(clear, std_err_main_addr);
116 /* Nothing to be handled here as of now */
119 /* Error found so break the for loop */
126 static int __init omap4_l3_probe(struct platform_device *pdev)
128 static struct omap4_l3 *l3;
129 struct resource *res;
133 l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
137 platform_set_drvdata(pdev, l3);
138 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140 dev_err(&pdev->dev, "couldn't find resource 0\n");
145 l3->l3_base[0] = ioremap(res->start, resource_size(res));
146 if (!(l3->l3_base[0])) {
147 dev_err(&pdev->dev, "ioremap failed\n");
152 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
154 dev_err(&pdev->dev, "couldn't find resource 1\n");
159 l3->l3_base[1] = ioremap(res->start, resource_size(res));
160 if (!(l3->l3_base[1])) {
161 dev_err(&pdev->dev, "ioremap failed\n");
166 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
168 dev_err(&pdev->dev, "couldn't find resource 2\n");
173 l3->l3_base[2] = ioremap(res->start, resource_size(res));
174 if (!(l3->l3_base[2])) {
175 dev_err(&pdev->dev, "ioremap failed\n");
181 * Setup interrupt Handlers
183 irq = platform_get_irq(pdev, 0);
184 ret = request_irq(irq,
185 l3_interrupt_handler,
186 IRQF_DISABLED, "l3-dbg-irq", l3);
188 pr_crit("L3: request_irq failed to register for 0x%x\n",
189 OMAP44XX_IRQ_L3_DBG);
194 irq = platform_get_irq(pdev, 1);
195 ret = request_irq(irq,
196 l3_interrupt_handler,
197 IRQF_DISABLED, "l3-app-irq", l3);
199 pr_crit("L3: request_irq failed to register for 0x%x\n",
200 OMAP44XX_IRQ_L3_APP);
208 free_irq(l3->debug_irq, l3);
210 iounmap(l3->l3_base[2]);
212 iounmap(l3->l3_base[1]);
214 iounmap(l3->l3_base[0]);
220 static int __exit omap4_l3_remove(struct platform_device *pdev)
222 struct omap4_l3 *l3 = platform_get_drvdata(pdev);
224 free_irq(l3->app_irq, l3);
225 free_irq(l3->debug_irq, l3);
226 iounmap(l3->l3_base[0]);
227 iounmap(l3->l3_base[1]);
228 iounmap(l3->l3_base[2]);
234 static struct platform_driver omap4_l3_driver = {
235 .remove = __exit_p(omap4_l3_remove),
237 .name = "omap_l3_noc",
241 static int __init omap4_l3_init(void)
243 return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe);
245 postcore_initcall_sync(omap4_l3_init);
247 static void __exit omap4_l3_exit(void)
249 platform_driver_unregister(&omap4_l3_driver);
251 module_exit(omap4_l3_exit);