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sricharaned0e3522011-08-24 20:07:45 +05301/*
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 */
Felipe Balbie2fa61d2011-03-07 19:35:20 +053024
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>
Tony Lindgrenaa25729c2014-11-05 09:21:23 -080030#include <linux/module.h>
31#include <linux/of.h>
32#include <linux/of_device.h>
33
Felipe Balbie2fa61d2011-03-07 19:35:20 +053034#include "omap_l3_smx.h"
35
36static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
37{
38 return __raw_readll(base + reg);
39}
40
41static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
42{
43 __raw_writell(value, base + reg);
44}
45
46static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
47{
48 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
49}
50
51static inline u32 omap3_l3_decode_addr(u64 error_addr)
52{
53 return error_addr & 0xffffffff;
54}
55
56static inline unsigned omap3_l3_decode_cmd(u64 error)
57{
58 return (error & 0x07) >> L3_ERROR_LOG_CMD;
59}
60
61static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
62{
63 return (error & 0xff00) >> L3_ERROR_LOG_INITID;
64}
65
66static inline unsigned omap3_l3_decode_req_info(u64 error)
67{
68 return (error >> 32) & 0xffff;
69}
70
71static char *omap3_l3_code_string(u8 code)
72{
73 switch (code) {
74 case OMAP_L3_CODE_NOERROR:
75 return "No Error";
76 case OMAP_L3_CODE_UNSUP_CMD:
77 return "Unsupported Command";
78 case OMAP_L3_CODE_ADDR_HOLE:
79 return "Address Hole";
80 case OMAP_L3_CODE_PROTECT_VIOLATION:
81 return "Protection Violation";
82 case OMAP_L3_CODE_IN_BAND_ERR:
83 return "In-band Error";
84 case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
85 return "Request Timeout Not Accepted";
86 case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
87 return "Request Timeout, no response";
88 default:
89 return "UNKNOWN error";
90 }
91}
92
93static char *omap3_l3_initiator_string(u8 initid)
94{
95 switch (initid) {
96 case OMAP_L3_LCD:
97 return "LCD";
98 case OMAP_L3_SAD2D:
99 return "SAD2D";
100 case OMAP_L3_IA_MPU_SS_1:
101 case OMAP_L3_IA_MPU_SS_2:
102 case OMAP_L3_IA_MPU_SS_3:
103 case OMAP_L3_IA_MPU_SS_4:
104 case OMAP_L3_IA_MPU_SS_5:
105 return "MPU";
106 case OMAP_L3_IA_IVA_SS_1:
107 case OMAP_L3_IA_IVA_SS_2:
108 case OMAP_L3_IA_IVA_SS_3:
109 return "IVA_SS";
110 case OMAP_L3_IA_IVA_SS_DMA_1:
111 case OMAP_L3_IA_IVA_SS_DMA_2:
112 case OMAP_L3_IA_IVA_SS_DMA_3:
113 case OMAP_L3_IA_IVA_SS_DMA_4:
114 case OMAP_L3_IA_IVA_SS_DMA_5:
115 case OMAP_L3_IA_IVA_SS_DMA_6:
116 return "IVA_SS_DMA";
117 case OMAP_L3_IA_SGX:
118 return "SGX";
119 case OMAP_L3_IA_CAM_1:
120 case OMAP_L3_IA_CAM_2:
121 case OMAP_L3_IA_CAM_3:
122 return "CAM";
123 case OMAP_L3_IA_DAP:
124 return "DAP";
125 case OMAP_L3_SDMA_WR_1:
126 case OMAP_L3_SDMA_WR_2:
127 return "SDMA_WR";
128 case OMAP_L3_SDMA_RD_1:
129 case OMAP_L3_SDMA_RD_2:
130 case OMAP_L3_SDMA_RD_3:
131 case OMAP_L3_SDMA_RD_4:
132 return "SDMA_RD";
133 case OMAP_L3_USBOTG:
134 return "USB_OTG";
135 case OMAP_L3_USBHOST:
136 return "USB_HOST";
137 default:
138 return "UNKNOWN Initiator";
139 }
140}
141
sricharaned0e3522011-08-24 20:07:45 +0530142/*
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530143 * omap3_l3_block_irq - handles a register block's irq
144 * @l3: struct omap3_l3 *
145 * @base: register block base address
146 * @error: L3_ERROR_LOG register of our block
147 *
148 * Called in hard-irq context. Caller should take care of locking
149 *
150 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
151 * Analysis Sequence, we are following that sequence here, please
152 * refer to that Figure for more information on the subject.
153 */
154static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
155 u64 error, int error_addr)
156{
sricharaned0e3522011-08-24 20:07:45 +0530157 u8 code = omap3_l3_decode_error_code(error);
158 u8 initid = omap3_l3_decode_initid(error);
159 u8 multi = error & L3_ERROR_LOG_MULTI;
160 u32 address = omap3_l3_decode_addr(error_addr);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530161
Tony Lindgren00d6bfa2012-06-06 01:42:20 -0700162 pr_err("%s seen by %s %s at address %x\n",
sricharaned0e3522011-08-24 20:07:45 +0530163 omap3_l3_code_string(code),
164 omap3_l3_initiator_string(initid),
165 multi ? "Multiple Errors" : "", address);
Tony Lindgren00d6bfa2012-06-06 01:42:20 -0700166 WARN_ON(1);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530167
168 return IRQ_HANDLED;
169}
170
171static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
172{
sricharaned0e3522011-08-24 20:07:45 +0530173 struct omap3_l3 *l3 = _l3;
174 u64 status, clear;
175 u64 error;
176 u64 error_addr;
177 u64 err_source = 0;
178 void __iomem *base;
179 int int_type;
180 irqreturn_t ret = IRQ_NONE;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530181
omar ramirez35f7b962011-04-18 16:39:42 +0000182 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530183 if (!int_type) {
184 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
185 /*
186 * if we have a timeout error, there's nothing we can
187 * do besides rebooting the board. So let's BUG on any
188 * of such errors and handle the others. timeout error
189 * is severe and not expected to occur.
190 */
191 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
192 } else {
193 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
194 /* No timeout error for debug sources */
195 }
196
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530197 /* identify the error source */
Todd Poynor342fd142011-08-24 19:11:39 +0530198 err_source = __ffs(status);
omar ramirezbc16b372011-04-26 02:24:50 -0700199
Todd Poynor342fd142011-08-24 19:11:39 +0530200 base = l3->rt + omap3_l3_bases[int_type][err_source];
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530201 error = omap3_l3_readll(base, L3_ERROR_LOG);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530202 if (error) {
203 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530204 ret |= omap3_l3_block_irq(l3, error, error_addr);
205 }
206
207 /* Clear the status register */
omar ramirez35f7b962011-04-18 16:39:42 +0000208 clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
209 L3_AGENT_STATUS_CLEAR_TA;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530210 omap3_l3_writell(base, L3_AGENT_STATUS, clear);
211
212 /* clear the error log register */
213 omap3_l3_writell(base, L3_ERROR_LOG, error);
214
215 return ret;
216}
217
Tony Lindgrenaa25729c2014-11-05 09:21:23 -0800218#if IS_BUILTIN(CONFIG_OF)
219static const struct of_device_id omap3_l3_match[] = {
220 {
221 .compatible = "ti,omap3-l3-smx",
222 },
223 { },
224};
225MODULE_DEVICE_TABLE(of, omap3_l3_match);
226#endif
227
228static int omap3_l3_probe(struct platform_device *pdev)
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530229{
sricharaned0e3522011-08-24 20:07:45 +0530230 struct omap3_l3 *l3;
231 struct resource *res;
232 int ret;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530233
234 l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
omar ramirez7529b702011-04-18 16:39:41 +0000235 if (!l3)
236 return -ENOMEM;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530237
238 platform_set_drvdata(pdev, l3);
239
240 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
241 if (!res) {
242 dev_err(&pdev->dev, "couldn't find resource\n");
243 ret = -ENODEV;
omar ramirez7529b702011-04-18 16:39:41 +0000244 goto err0;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530245 }
246 l3->rt = ioremap(res->start, resource_size(res));
omar ramirez35f7b962011-04-18 16:39:42 +0000247 if (!l3->rt) {
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530248 dev_err(&pdev->dev, "ioremap failed\n");
249 ret = -ENOMEM;
omar ramirez7529b702011-04-18 16:39:41 +0000250 goto err0;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530251 }
252
Aaro Koskinen18a81012011-03-18 16:53:20 -0700253 l3->debug_irq = platform_get_irq(pdev, 0);
254 ret = request_irq(l3->debug_irq, omap3_l3_app_irq,
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530255 IRQF_DISABLED | IRQF_TRIGGER_RISING,
256 "l3-debug-irq", l3);
257 if (ret) {
258 dev_err(&pdev->dev, "couldn't request debug irq\n");
omar ramirez7529b702011-04-18 16:39:41 +0000259 goto err1;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530260 }
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530261
Aaro Koskinen18a81012011-03-18 16:53:20 -0700262 l3->app_irq = platform_get_irq(pdev, 1);
263 ret = request_irq(l3->app_irq, omap3_l3_app_irq,
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530264 IRQF_DISABLED | IRQF_TRIGGER_RISING,
265 "l3-app-irq", l3);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530266 if (ret) {
267 dev_err(&pdev->dev, "couldn't request app irq\n");
omar ramirez7529b702011-04-18 16:39:41 +0000268 goto err2;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530269 }
270
omar ramirez7529b702011-04-18 16:39:41 +0000271 return 0;
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530272
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530273err2:
omar ramirez7529b702011-04-18 16:39:41 +0000274 free_irq(l3->debug_irq, l3);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530275err1:
omar ramirez7529b702011-04-18 16:39:41 +0000276 iounmap(l3->rt);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530277err0:
omar ramirez7529b702011-04-18 16:39:41 +0000278 kfree(l3);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530279 return ret;
280}
281
Tony Lindgrenaa25729c2014-11-05 09:21:23 -0800282static int omap3_l3_remove(struct platform_device *pdev)
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530283{
284 struct omap3_l3 *l3 = platform_get_drvdata(pdev);
285
286 free_irq(l3->app_irq, l3);
287 free_irq(l3->debug_irq, l3);
288 iounmap(l3->rt);
289 kfree(l3);
290
291 return 0;
292}
293
294static struct platform_driver omap3_l3_driver = {
Tony Lindgrenaa25729c2014-11-05 09:21:23 -0800295 .probe = omap3_l3_probe,
296 .remove = omap3_l3_remove,
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530297 .driver = {
Tony Lindgrenaa25729c2014-11-05 09:21:23 -0800298 .name = "omap_l3_smx",
299 .of_match_table = of_match_ptr(omap3_l3_match),
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530300 },
301};
302
303static int __init omap3_l3_init(void)
304{
Tony Lindgrenaa25729c2014-11-05 09:21:23 -0800305 return platform_driver_register(&omap3_l3_driver);
Felipe Balbie2fa61d2011-03-07 19:35:20 +0530306}
307postcore_initcall_sync(omap3_l3_init);
308
309static void __exit omap3_l3_exit(void)
310{
311 platform_driver_unregister(&omap3_l3_driver);
312}
313module_exit(omap3_l3_exit);