aboutsummaryrefslogtreecommitdiff
path: root/drivers/bus/omap_l3_smx.c
blob: acc216491b8a5908656354f7c2ba7ffbfce8944a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
/*
 * OMAP3XXX L3 Interconnect Driver
 *
 * Copyright (C) 2011 Texas Corporation
 *	Felipe Balbi <balbi@ti.com>
 *	Santosh Shilimkar <santosh.shilimkar@ti.com>
 *	Sricharan <r.sricharan@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include "omap_l3_smx.h"

static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
{
	return __raw_readll(base + reg);
}

static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
{
	__raw_writell(value, base + reg);
}

static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
{
	return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
}

static inline u32 omap3_l3_decode_addr(u64 error_addr)
{
	return error_addr & 0xffffffff;
}

static inline unsigned omap3_l3_decode_cmd(u64 error)
{
	return (error & 0x07) >> L3_ERROR_LOG_CMD;
}

static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
{
	return (error & 0xff00) >> L3_ERROR_LOG_INITID;
}

static inline unsigned omap3_l3_decode_req_info(u64 error)
{
	return (error >> 32) & 0xffff;
}

static char *omap3_l3_code_string(u8 code)
{
	switch (code) {
	case OMAP_L3_CODE_NOERROR:
		return "No Error";
	case OMAP_L3_CODE_UNSUP_CMD:
		return "Unsupported Command";
	case OMAP_L3_CODE_ADDR_HOLE:
		return "Address Hole";
	case OMAP_L3_CODE_PROTECT_VIOLATION:
		return "Protection Violation";
	case OMAP_L3_CODE_IN_BAND_ERR:
		return "In-band Error";
	case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
		return "Request Timeout Not Accepted";
	case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
		return "Request Timeout, no response";
	default:
		return "UNKNOWN error";
	}
}

static char *omap3_l3_initiator_string(u8 initid)
{
	switch (initid) {
	case OMAP_L3_LCD:
		return "LCD";
	case OMAP_L3_SAD2D:
		return "SAD2D";
	case OMAP_L3_IA_MPU_SS_1:
	case OMAP_L3_IA_MPU_SS_2:
	case OMAP_L3_IA_MPU_SS_3:
	case OMAP_L3_IA_MPU_SS_4:
	case OMAP_L3_IA_MPU_SS_5:
		return "MPU";
	case OMAP_L3_IA_IVA_SS_1:
	case OMAP_L3_IA_IVA_SS_2:
	case OMAP_L3_IA_IVA_SS_3:
		return "IVA_SS";
	case OMAP_L3_IA_IVA_SS_DMA_1:
	case OMAP_L3_IA_IVA_SS_DMA_2:
	case OMAP_L3_IA_IVA_SS_DMA_3:
	case OMAP_L3_IA_IVA_SS_DMA_4:
	case OMAP_L3_IA_IVA_SS_DMA_5:
	case OMAP_L3_IA_IVA_SS_DMA_6:
		return "IVA_SS_DMA";
	case OMAP_L3_IA_SGX:
		return "SGX";
	case OMAP_L3_IA_CAM_1:
	case OMAP_L3_IA_CAM_2:
	case OMAP_L3_IA_CAM_3:
		return "CAM";
	case OMAP_L3_IA_DAP:
		return "DAP";
	case OMAP_L3_SDMA_WR_1:
	case OMAP_L3_SDMA_WR_2:
		return "SDMA_WR";
	case OMAP_L3_SDMA_RD_1:
	case OMAP_L3_SDMA_RD_2:
	case OMAP_L3_SDMA_RD_3:
	case OMAP_L3_SDMA_RD_4:
		return "SDMA_RD";
	case OMAP_L3_USBOTG:
		return "USB_OTG";
	case OMAP_L3_USBHOST:
		return "USB_HOST";
	default:
		return "UNKNOWN Initiator";
	}
}

/*
 * omap3_l3_block_irq - handles a register block's irq
 * @l3: struct omap3_l3 *
 * @base: register block base address
 * @error: L3_ERROR_LOG register of our block
 *
 * Called in hard-irq context. Caller should take care of locking
 *
 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
 * Analysis Sequence, we are following that sequence here, please
 * refer to that Figure for more information on the subject.
 */
static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
					u64 error, int error_addr)
{
	u8 code = omap3_l3_decode_error_code(error);
	u8 initid = omap3_l3_decode_initid(error);
	u8 multi = error & L3_ERROR_LOG_MULTI;
	u32 address = omap3_l3_decode_addr(error_addr);

	pr_err("%s seen by %s %s at address %x\n",
			omap3_l3_code_string(code),
			omap3_l3_initiator_string(initid),
			multi ? "Multiple Errors" : "", address);
	WARN_ON(1);

	return IRQ_HANDLED;
}

static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
{
	struct omap3_l3 *l3 = _l3;
	u64 status, clear;
	u64 error;
	u64 error_addr;
	u64 err_source = 0;
	void __iomem *base;
	int int_type;
	irqreturn_t ret = IRQ_NONE;

	int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
	if (!int_type) {
		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
		/*
		 * if we have a timeout error, there's nothing we can
		 * do besides rebooting the board. So let's BUG on any
		 * of such errors and handle the others. timeout error
		 * is severe and not expected to occur.
		 */
		BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
	} else {
		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
		/* No timeout error for debug sources */
	}

	/* identify the error source */
	err_source = __ffs(status);

	base = l3->rt + omap3_l3_bases[int_type][err_source];
	error = omap3_l3_readll(base, L3_ERROR_LOG);
	if (error) {
		error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
		ret |= omap3_l3_block_irq(l3, error, error_addr);
	}

	/* Clear the status register */
	clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
		L3_AGENT_STATUS_CLEAR_TA;
	omap3_l3_writell(base, L3_AGENT_STATUS, clear);

	/* clear the error log register */
	omap3_l3_writell(base, L3_ERROR_LOG, error);

	return ret;
}

static int __init omap3_l3_probe(struct platform_device *pdev)
{
	struct omap3_l3 *l3;
	struct resource *res;
	int ret;

	l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
	if (!l3)
		return -ENOMEM;

	platform_set_drvdata(pdev, l3);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "couldn't find resource\n");
		ret = -ENODEV;
		goto err0;
	}
	l3->rt = ioremap(res->start, resource_size(res));
	if (!l3->rt) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto err0;
	}

	l3->debug_irq = platform_get_irq(pdev, 0);
	ret = request_irq(l3->debug_irq, omap3_l3_app_irq,
		IRQF_DISABLED | IRQF_TRIGGER_RISING,
		"l3-debug-irq", l3);
	if (ret) {
		dev_err(&pdev->dev, "couldn't request debug irq\n");
		goto err1;
	}

	l3->app_irq = platform_get_irq(pdev, 1);
	ret = request_irq(l3->app_irq, omap3_l3_app_irq,
		IRQF_DISABLED | IRQF_TRIGGER_RISING,
		"l3-app-irq", l3);
	if (ret) {
		dev_err(&pdev->dev, "couldn't request app irq\n");
		goto err2;
	}

	return 0;

err2:
	free_irq(l3->debug_irq, l3);
err1:
	iounmap(l3->rt);
err0:
	kfree(l3);
	return ret;
}

static int __exit omap3_l3_remove(struct platform_device *pdev)
{
	struct omap3_l3         *l3 = platform_get_drvdata(pdev);

	free_irq(l3->app_irq, l3);
	free_irq(l3->debug_irq, l3);
	iounmap(l3->rt);
	kfree(l3);

	return 0;
}

static struct platform_driver omap3_l3_driver = {
	.remove         = __exit_p(omap3_l3_remove),
	.driver         = {
	.name   = "omap_l3_smx",
	},
};

static int __init omap3_l3_init(void)
{
	return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
}
postcore_initcall_sync(omap3_l3_init);

static void __exit omap3_l3_exit(void)
{
	platform_driver_unregister(&omap3_l3_driver);
}
module_exit(omap3_l3_exit);