xref: /openbmc/linux/drivers/bus/omap_l3_smx.c (revision f89d416a)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * OMAP3XXX L3 Interconnect Driver
4  *
5  * Copyright (C) 2011 Texas Corporation
6  *	Felipe Balbi <balbi@ti.com>
7  *	Santosh Shilimkar <santosh.shilimkar@ti.com>
8  *	Sricharan <r.sricharan@ti.com>
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 
20 #include "omap_l3_smx.h"
21 
22 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
23 {
24 	return __raw_readll(base + reg);
25 }
26 
27 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
28 {
29 	__raw_writell(value, base + reg);
30 }
31 
32 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
33 {
34 	return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
35 }
36 
37 static inline u32 omap3_l3_decode_addr(u64 error_addr)
38 {
39 	return error_addr & 0xffffffff;
40 }
41 
42 static inline unsigned omap3_l3_decode_cmd(u64 error)
43 {
44 	return (error & 0x07) >> L3_ERROR_LOG_CMD;
45 }
46 
47 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
48 {
49 	return (error & 0xff00) >> L3_ERROR_LOG_INITID;
50 }
51 
52 static inline unsigned omap3_l3_decode_req_info(u64 error)
53 {
54 	return (error >> 32) & 0xffff;
55 }
56 
57 static char *omap3_l3_code_string(u8 code)
58 {
59 	switch (code) {
60 	case OMAP_L3_CODE_NOERROR:
61 		return "No Error";
62 	case OMAP_L3_CODE_UNSUP_CMD:
63 		return "Unsupported Command";
64 	case OMAP_L3_CODE_ADDR_HOLE:
65 		return "Address Hole";
66 	case OMAP_L3_CODE_PROTECT_VIOLATION:
67 		return "Protection Violation";
68 	case OMAP_L3_CODE_IN_BAND_ERR:
69 		return "In-band Error";
70 	case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
71 		return "Request Timeout Not Accepted";
72 	case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
73 		return "Request Timeout, no response";
74 	default:
75 		return "UNKNOWN error";
76 	}
77 }
78 
79 static char *omap3_l3_initiator_string(u8 initid)
80 {
81 	switch (initid) {
82 	case OMAP_L3_LCD:
83 		return "LCD";
84 	case OMAP_L3_SAD2D:
85 		return "SAD2D";
86 	case OMAP_L3_IA_MPU_SS_1:
87 	case OMAP_L3_IA_MPU_SS_2:
88 	case OMAP_L3_IA_MPU_SS_3:
89 	case OMAP_L3_IA_MPU_SS_4:
90 	case OMAP_L3_IA_MPU_SS_5:
91 		return "MPU";
92 	case OMAP_L3_IA_IVA_SS_1:
93 	case OMAP_L3_IA_IVA_SS_2:
94 	case OMAP_L3_IA_IVA_SS_3:
95 		return "IVA_SS";
96 	case OMAP_L3_IA_IVA_SS_DMA_1:
97 	case OMAP_L3_IA_IVA_SS_DMA_2:
98 	case OMAP_L3_IA_IVA_SS_DMA_3:
99 	case OMAP_L3_IA_IVA_SS_DMA_4:
100 	case OMAP_L3_IA_IVA_SS_DMA_5:
101 	case OMAP_L3_IA_IVA_SS_DMA_6:
102 		return "IVA_SS_DMA";
103 	case OMAP_L3_IA_SGX:
104 		return "SGX";
105 	case OMAP_L3_IA_CAM_1:
106 	case OMAP_L3_IA_CAM_2:
107 	case OMAP_L3_IA_CAM_3:
108 		return "CAM";
109 	case OMAP_L3_IA_DAP:
110 		return "DAP";
111 	case OMAP_L3_SDMA_WR_1:
112 	case OMAP_L3_SDMA_WR_2:
113 		return "SDMA_WR";
114 	case OMAP_L3_SDMA_RD_1:
115 	case OMAP_L3_SDMA_RD_2:
116 	case OMAP_L3_SDMA_RD_3:
117 	case OMAP_L3_SDMA_RD_4:
118 		return "SDMA_RD";
119 	case OMAP_L3_USBOTG:
120 		return "USB_OTG";
121 	case OMAP_L3_USBHOST:
122 		return "USB_HOST";
123 	default:
124 		return "UNKNOWN Initiator";
125 	}
126 }
127 
128 /*
129  * omap3_l3_block_irq - handles a register block's irq
130  * @l3: struct omap3_l3 *
131  * @base: register block base address
132  * @error: L3_ERROR_LOG register of our block
133  *
134  * Called in hard-irq context. Caller should take care of locking
135  *
136  * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
137  * Analysis Sequence, we are following that sequence here, please
138  * refer to that Figure for more information on the subject.
139  */
140 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
141 					u64 error, int error_addr)
142 {
143 	u8 code = omap3_l3_decode_error_code(error);
144 	u8 initid = omap3_l3_decode_initid(error);
145 	u8 multi = error & L3_ERROR_LOG_MULTI;
146 	u32 address = omap3_l3_decode_addr(error_addr);
147 
148 	pr_err("%s seen by %s %s at address %x\n",
149 			omap3_l3_code_string(code),
150 			omap3_l3_initiator_string(initid),
151 			multi ? "Multiple Errors" : "", address);
152 	WARN_ON(1);
153 
154 	return IRQ_HANDLED;
155 }
156 
157 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
158 {
159 	struct omap3_l3 *l3 = _l3;
160 	u64 status, clear;
161 	u64 error;
162 	u64 error_addr;
163 	u64 err_source = 0;
164 	void __iomem *base;
165 	int int_type;
166 	irqreturn_t ret = IRQ_NONE;
167 
168 	int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
169 	if (!int_type) {
170 		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
171 		/*
172 		 * if we have a timeout error, there's nothing we can
173 		 * do besides rebooting the board. So let's BUG on any
174 		 * of such errors and handle the others. timeout error
175 		 * is severe and not expected to occur.
176 		 */
177 		BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
178 	} else {
179 		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
180 		/* No timeout error for debug sources */
181 	}
182 
183 	/* identify the error source */
184 	err_source = __ffs(status);
185 
186 	base = l3->rt + omap3_l3_bases[int_type][err_source];
187 	error = omap3_l3_readll(base, L3_ERROR_LOG);
188 	if (error) {
189 		error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
190 		ret |= omap3_l3_block_irq(l3, error, error_addr);
191 	}
192 
193 	/* Clear the status register */
194 	clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
195 		L3_AGENT_STATUS_CLEAR_TA;
196 	omap3_l3_writell(base, L3_AGENT_STATUS, clear);
197 
198 	/* clear the error log register */
199 	omap3_l3_writell(base, L3_ERROR_LOG, error);
200 
201 	return ret;
202 }
203 
204 #if IS_BUILTIN(CONFIG_OF)
205 static const struct of_device_id omap3_l3_match[] = {
206 	{
207 		.compatible = "ti,omap3-l3-smx",
208 	},
209 	{ },
210 };
211 MODULE_DEVICE_TABLE(of, omap3_l3_match);
212 #endif
213 
214 static int omap3_l3_probe(struct platform_device *pdev)
215 {
216 	struct omap3_l3 *l3;
217 	struct resource *res;
218 	int ret;
219 
220 	l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
221 	if (!l3)
222 		return -ENOMEM;
223 
224 	platform_set_drvdata(pdev, l3);
225 
226 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
227 	if (!res) {
228 		dev_err(&pdev->dev, "couldn't find resource\n");
229 		ret = -ENODEV;
230 		goto err0;
231 	}
232 	l3->rt = ioremap(res->start, resource_size(res));
233 	if (!l3->rt) {
234 		dev_err(&pdev->dev, "ioremap failed\n");
235 		ret = -ENOMEM;
236 		goto err0;
237 	}
238 
239 	l3->debug_irq = platform_get_irq(pdev, 0);
240 	ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
241 			  "l3-debug-irq", l3);
242 	if (ret) {
243 		dev_err(&pdev->dev, "couldn't request debug irq\n");
244 		goto err1;
245 	}
246 
247 	l3->app_irq = platform_get_irq(pdev, 1);
248 	ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
249 			  "l3-app-irq", l3);
250 	if (ret) {
251 		dev_err(&pdev->dev, "couldn't request app irq\n");
252 		goto err2;
253 	}
254 
255 	return 0;
256 
257 err2:
258 	free_irq(l3->debug_irq, l3);
259 err1:
260 	iounmap(l3->rt);
261 err0:
262 	kfree(l3);
263 	return ret;
264 }
265 
266 static int omap3_l3_remove(struct platform_device *pdev)
267 {
268 	struct omap3_l3         *l3 = platform_get_drvdata(pdev);
269 
270 	free_irq(l3->app_irq, l3);
271 	free_irq(l3->debug_irq, l3);
272 	iounmap(l3->rt);
273 	kfree(l3);
274 
275 	return 0;
276 }
277 
278 static struct platform_driver omap3_l3_driver = {
279 	.probe		= omap3_l3_probe,
280 	.remove         = omap3_l3_remove,
281 	.driver         = {
282 		.name   = "omap_l3_smx",
283 		.of_match_table = of_match_ptr(omap3_l3_match),
284 	},
285 };
286 
287 static int __init omap3_l3_init(void)
288 {
289 	return platform_driver_register(&omap3_l3_driver);
290 }
291 postcore_initcall_sync(omap3_l3_init);
292 
293 static void __exit omap3_l3_exit(void)
294 {
295 	platform_driver_unregister(&omap3_l3_driver);
296 }
297 module_exit(omap3_l3_exit);
298 
299 MODULE_AUTHOR("Felipe Balbi");
300 MODULE_AUTHOR("Santosh Shilimkar");
301 MODULE_AUTHOR("Sricharan R");
302 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");
303 MODULE_LICENSE("GPL");
304