1/*
  2 * OMAP4XXX L3 Interconnect error handling driver
  3 *
  4 * Copyright (C) 2011 Texas Corporation
  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 as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 *
 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.
 17 *
 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
 21 * USA
 22 */
 23#include <linux/module.h>
 24#include <linux/init.h>
 25#include <linux/io.h>
 26#include <linux/platform_device.h>
 27#include <linux/interrupt.h>
 28#include <linux/kernel.h>
 29#include <linux/slab.h>
 30
 31#include "omap_l3_noc.h"
 32
 33/*
 34 * Interrupt Handler for L3 error detection.
 35 *	1) Identify the L3 clockdomain partition to which the error belongs to.
 36 *	2) Identify the slave where the error information is logged
 37 *	3) Print the logged information.
 38 *	4) Add dump stack to provide kernel trace.
 39 *
 40 * Two Types of errors :
 41 *	1) Custom errors in L3 :
 42 *		Target like DMM/FW/EMIF generates SRESP=ERR error
 43 *	2) Standard L3 error:
 44 *		- Unsupported CMD.
 45 *			L3 tries to access target while it is idle
 46 *		- OCP disconnect.
 47 *		- Address hole error:
 48 *			If DSS/ISS/FDIF/USBHOSTFS access a target where they
 49 *			do not have connectivity, the error is logged in
 50 *			their default target which is DMM2.
 51 *
 52 *	On High Secure devices, firewall errors are possible and those
 53 *	can be trapped as well. But the trapping is implemented as part
 54 *	secure software and hence need not be implemented here.
 55 */
 56static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 57{
 58
 59	struct omap4_l3 *l3 = _l3;
 60	int inttype, i, k;
 61	int err_src = 0;
 62	u32 std_err_main, err_reg, clear, masterid;
 63	void __iomem *base, *l3_targ_base;
 64	char *target_name, *master_name = "UN IDENTIFIED";
 65
 66	/* Get the Type of interrupt */
 67	inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
 68
 69	for (i = 0; i < L3_MODULES; i++) {
 70		/*
 71		 * Read the regerr register of the clock domain
 72		 * to determine the source
 73		 */
 74		base = l3->l3_base[i];
 75		err_reg = __raw_readl(base + l3_flagmux[i] +
 76					+ L3_FLAGMUX_REGERR0 + (inttype << 3));
 77
 78		/* Get the corresponding error and analyse */
 79		if (err_reg) {
 80			/* Identify the source from control status register */
 81			err_src = __ffs(err_reg);
 82
 83			/* Read the stderrlog_main_source from clk domain */
 84			l3_targ_base = base + *(l3_targ[i] + err_src);
 85			std_err_main =  __raw_readl(l3_targ_base +
 86					L3_TARG_STDERRLOG_MAIN);
 87			masterid = __raw_readl(l3_targ_base +
 88					L3_TARG_STDERRLOG_MSTADDR);
 89
 90			switch (std_err_main & CUSTOM_ERROR) {
 91			case STANDARD_ERROR:
 92				target_name =
 93					l3_targ_inst_name[i][err_src];
 94				WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
 95					target_name,
 96					__raw_readl(l3_targ_base +
 97						L3_TARG_STDERRLOG_SLVOFSLSB));
 98				/* clear the std error log*/
 99				clear = std_err_main | CLEAR_STDERR_LOG;
100				writel(clear, l3_targ_base +
101					L3_TARG_STDERRLOG_MAIN);
102				break;
103
104			case CUSTOM_ERROR:
105				target_name =
106					l3_targ_inst_name[i][err_src];
107				for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
108					if (masterid == l3_masters[k].id)
109						master_name =
110							l3_masters[k].name;
111				}
112				WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
113					master_name, target_name);
114				/* clear the std error log*/
115				clear = std_err_main | CLEAR_STDERR_LOG;
116				writel(clear, l3_targ_base +
117					L3_TARG_STDERRLOG_MAIN);
118				break;
119
120			default:
121				/* Nothing to be handled here as of now */
122				break;
123			}
124		/* Error found so break the for loop */
125		break;
126		}
127	}
128	return IRQ_HANDLED;
129}
130
131static int __devinit omap4_l3_probe(struct platform_device *pdev)
132{
133	static struct omap4_l3 *l3;
134	struct resource	*res;
135	int ret;
136
137	l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
138	if (!l3)
139		return -ENOMEM;
140
141	platform_set_drvdata(pdev, l3);
142	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143	if (!res) {
144		dev_err(&pdev->dev, "couldn't find resource 0\n");
145		ret = -ENODEV;
146		goto err0;
147	}
148
149	l3->l3_base[0] = ioremap(res->start, resource_size(res));
150	if (!l3->l3_base[0]) {
151		dev_err(&pdev->dev, "ioremap failed\n");
152		ret = -ENOMEM;
153		goto err0;
154	}
155
156	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
157	if (!res) {
158		dev_err(&pdev->dev, "couldn't find resource 1\n");
159		ret = -ENODEV;
160		goto err1;
161	}
162
163	l3->l3_base[1] = ioremap(res->start, resource_size(res));
164	if (!l3->l3_base[1]) {
165		dev_err(&pdev->dev, "ioremap failed\n");
166		ret = -ENOMEM;
167		goto err1;
168	}
169
170	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
171	if (!res) {
172		dev_err(&pdev->dev, "couldn't find resource 2\n");
173		ret = -ENODEV;
174		goto err2;
175	}
176
177	l3->l3_base[2] = ioremap(res->start, resource_size(res));
178	if (!l3->l3_base[2]) {
179		dev_err(&pdev->dev, "ioremap failed\n");
180		ret = -ENOMEM;
181		goto err2;
182	}
183
184	/*
185	 * Setup interrupt Handlers
186	 */
187	l3->debug_irq = platform_get_irq(pdev, 0);
188	ret = request_irq(l3->debug_irq,
189			l3_interrupt_handler,
190			IRQF_DISABLED, "l3-dbg-irq", l3);
191	if (ret) {
192		pr_crit("L3: request_irq failed to register for 0x%x\n",
193						OMAP44XX_IRQ_L3_DBG);
194		goto err3;
195	}
196
197	l3->app_irq = platform_get_irq(pdev, 1);
198	ret = request_irq(l3->app_irq,
199			l3_interrupt_handler,
200			IRQF_DISABLED, "l3-app-irq", l3);
201	if (ret) {
202		pr_crit("L3: request_irq failed to register for 0x%x\n",
203						OMAP44XX_IRQ_L3_APP);
204		goto err4;
205	}
206
207	return 0;
208
209err4:
210	free_irq(l3->debug_irq, l3);
211err3:
212	iounmap(l3->l3_base[2]);
213err2:
214	iounmap(l3->l3_base[1]);
215err1:
216	iounmap(l3->l3_base[0]);
217err0:
218	kfree(l3);
219	return ret;
220}
221
222static int __devexit omap4_l3_remove(struct platform_device *pdev)
223{
224	struct omap4_l3 *l3 = platform_get_drvdata(pdev);
225
226	free_irq(l3->app_irq, l3);
227	free_irq(l3->debug_irq, l3);
228	iounmap(l3->l3_base[0]);
229	iounmap(l3->l3_base[1]);
230	iounmap(l3->l3_base[2]);
231	kfree(l3);
232
233	return 0;
234}
235
236#if defined(CONFIG_OF)
237static const struct of_device_id l3_noc_match[] = {
238	{.compatible = "ti,omap4-l3-noc", },
239	{},
240};
241MODULE_DEVICE_TABLE(of, l3_noc_match);
242#else
243#define l3_noc_match NULL
244#endif
245
246static struct platform_driver omap4_l3_driver = {
247	.probe		= omap4_l3_probe,
248	.remove		= __devexit_p(omap4_l3_remove),
249	.driver		= {
250		.name		= "omap_l3_noc",
251		.owner		= THIS_MODULE,
252		.of_match_table = l3_noc_match,
253	},
254};
255
256static int __init omap4_l3_init(void)
257{
258	return platform_driver_register(&omap4_l3_driver);
259}
260postcore_initcall_sync(omap4_l3_init);
261
262static void __exit omap4_l3_exit(void)
263{
264	platform_driver_unregister(&omap4_l3_driver);
265}
266module_exit(omap4_l3_exit);