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
22static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
23{
24	return __raw_readll(base + reg);
25}
26
27static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
28{
29	__raw_writell(value, base + reg);
30}
31
32static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
33{
34	return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
35}
36
37static inline u32 omap3_l3_decode_addr(u64 error_addr)
38{
39	return error_addr & 0xffffffff;
40}
41
42static inline unsigned omap3_l3_decode_cmd(u64 error)
43{
44	return (error & 0x07) >> L3_ERROR_LOG_CMD;
45}
46
47static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
48{
49	return (error & 0xff00) >> L3_ERROR_LOG_INITID;
50}
51
52static inline unsigned omap3_l3_decode_req_info(u64 error)
53{
54	return (error >> 32) & 0xffff;
55}
56
57static 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
79static 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 */
140static 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
157static 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)
205static const struct of_device_id omap3_l3_match[] = {
206	{
207		.compatible = "ti,omap3-l3-smx",
208	},
209	{ },
210};
211MODULE_DEVICE_TABLE(of, omap3_l3_match);
212#endif
213
214static 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
257err2:
258	free_irq(l3->debug_irq, l3);
259err1:
260	iounmap(l3->rt);
261err0:
262	kfree(l3);
263	return ret;
264}
265
266static 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
278static 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
287static int __init omap3_l3_init(void)
288{
289	return platform_driver_register(&omap3_l3_driver);
290}
291postcore_initcall_sync(omap3_l3_init);
292
293static void __exit omap3_l3_exit(void)
294{
295	platform_driver_unregister(&omap3_l3_driver);
296}
297module_exit(omap3_l3_exit);
298
299MODULE_AUTHOR("Felipe Balbi");
300MODULE_AUTHOR("Santosh Shilimkar");
301MODULE_AUTHOR("Sricharan R");
302MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");
303MODULE_LICENSE("GPL");
304