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