1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * OMAP3XXX L3 Interconnect Driver
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>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/interrupt.h>
16 #include <linux/module.h>
19 #include "omap_l3_smx.h"
21 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
23 return __raw_readll(base + reg);
26 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
28 __raw_writell(value, base + reg);
31 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
33 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
36 static inline u32 omap3_l3_decode_addr(u64 error_addr)
38 return error_addr & 0xffffffff;
41 static inline unsigned omap3_l3_decode_cmd(u64 error)
43 return (error & 0x07) >> L3_ERROR_LOG_CMD;
46 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
48 return (error & 0xff00) >> L3_ERROR_LOG_INITID;
51 static inline unsigned omap3_l3_decode_req_info(u64 error)
53 return (error >> 32) & 0xffff;
56 static char *omap3_l3_code_string(u8 code)
59 case OMAP_L3_CODE_NOERROR:
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";
74 return "UNKNOWN error";
78 static char *omap3_l3_initiator_string(u8 initid)
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:
91 case OMAP_L3_IA_IVA_SS_1:
92 case OMAP_L3_IA_IVA_SS_2:
93 case OMAP_L3_IA_IVA_SS_3:
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:
104 case OMAP_L3_IA_CAM_1:
105 case OMAP_L3_IA_CAM_2:
106 case OMAP_L3_IA_CAM_3:
110 case OMAP_L3_SDMA_WR_1:
111 case OMAP_L3_SDMA_WR_2:
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:
120 case OMAP_L3_USBHOST:
123 return "UNKNOWN Initiator";
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
133 * Called in hard-irq context. Caller should take care of locking
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.
139 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
140 u64 error, int error_addr)
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);
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);
156 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
158 struct omap3_l3 *l3 = _l3;
165 irqreturn_t ret = IRQ_NONE;
167 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
169 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
171 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
173 /* identify the error source */
174 err_source = __ffs(status);
176 base = l3->rt + omap3_l3_bases[int_type][err_source];
177 error = omap3_l3_readll(base, L3_ERROR_LOG);
179 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
180 ret |= omap3_l3_block_irq(l3, error, error_addr);
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.
189 BUG_ON(!int_type && status & L3_STATUS_0_TIMEOUT_MASK);
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);
196 /* clear the error log register */
197 omap3_l3_writell(base, L3_ERROR_LOG, error);
202 #if IS_BUILTIN(CONFIG_OF)
203 static const struct of_device_id omap3_l3_match[] = {
205 .compatible = "ti,omap3-l3-smx",
209 MODULE_DEVICE_TABLE(of, omap3_l3_match);
212 static int omap3_l3_probe(struct platform_device *pdev)
215 struct resource *res;
218 l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
222 platform_set_drvdata(pdev, l3);
224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
226 dev_err(&pdev->dev, "couldn't find resource\n");
230 l3->rt = ioremap(res->start, resource_size(res));
232 dev_err(&pdev->dev, "ioremap failed\n");
237 l3->debug_irq = platform_get_irq(pdev, 0);
238 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
241 dev_err(&pdev->dev, "couldn't request debug irq\n");
245 l3->app_irq = platform_get_irq(pdev, 1);
246 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING,
249 dev_err(&pdev->dev, "couldn't request app irq\n");
256 free_irq(l3->debug_irq, l3);
264 static int omap3_l3_remove(struct platform_device *pdev)
266 struct omap3_l3 *l3 = platform_get_drvdata(pdev);
268 free_irq(l3->app_irq, l3);
269 free_irq(l3->debug_irq, l3);
276 static struct platform_driver omap3_l3_driver = {
277 .probe = omap3_l3_probe,
278 .remove = omap3_l3_remove,
280 .name = "omap_l3_smx",
281 .of_match_table = of_match_ptr(omap3_l3_match),
285 static int __init omap3_l3_init(void)
287 return platform_driver_register(&omap3_l3_driver);
289 postcore_initcall_sync(omap3_l3_init);
291 static void __exit omap3_l3_exit(void)
293 platform_driver_unregister(&omap3_l3_driver);
295 module_exit(omap3_l3_exit);
297 MODULE_AUTHOR("Felipe Balbi");
298 MODULE_AUTHOR("Santosh Shilimkar");
299 MODULE_AUTHOR("Sricharan R");
300 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver");
301 MODULE_LICENSE("GPL");