1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2007 Ralf Baechle <ralf@linux-mips.org>
7  *    written by Ralf Baechle <ralf@linux-mips.org>
85  * Routines for using 40-bit SCD cycle counter
89  * zclk_timer_init(0) at least every 2^40 - 1 ZCLKs.
145 	u64 next = (1ULL << 40) - tb_period;  in arm_tb()
156 	 * Unfortunately, in Pass 2 we must clear all counters to knock down  in arm_tb()
158 	 * requires ALL of the SCD perf counters.  in arm_tb()
162 						/* keep counters 0,2,3,4,5,6,7 as is */  in arm_tb()
167 		     M_SPC_CFG_CLEAR |		/* clear all counters */  in arm_tb()
172 						/* keep counters 0,2,3 as is */  in arm_tb()
174 		     M_SPC_CFG_CLEAR |		/* clear all counters */  in arm_tb()
182 	/* XXXKW may want to expose control to the data-collector */  in arm_tb()
203 		for (i = 256 * 6; i > 0; i -= 6) {  in sbprof_tb_intr()
206 			p[i - 1] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
208 			p[i - 2] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
210 			p[i - 3] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
212 			p[i - 4] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
214 			p[i - 5] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
216 			p[i - 6] = __raw_readq(IOADDR(A_SCD_TRACE_READ));  in sbprof_tb_intr()
226 			/* knock down current interrupt and get another one later */  in sbprof_tb_intr()
249  *	     saturate 40 bits.	No subsequent use of SCD performance counters
259 		return -EBUSY;  in sbprof_zbprof_start()
264 	filp->f_pos = 0;  in sbprof_zbprof_start()
269 		return -EBUSY;  in sbprof_zbprof_start()
271 	/* Make sure there isn't a perf-cnt interrupt waiting */  in sbprof_zbprof_start()
273 	/* Disable and clear counters, override SRC_1 */  in sbprof_zbprof_start()
281 	 * (they only feed into the trace-on-interrupt mechanism)  in sbprof_zbprof_start()
285 		return -EBUSY;  in sbprof_zbprof_start()
319 	/* Initialize Trace Event 0-7 */  in sbprof_zbprof_start()
330 	/* Initialize Trace Sequence 0-7 */  in sbprof_zbprof_start()
345 	/* Now indicate the PERF_CNT interrupt as a trace-relevant interrupt */  in sbprof_zbprof_start()
395 		return -ENODEV;  in sbprof_tb_open()
398 		return -EBUSY;  in sbprof_tb_open()
405 		return -ENOMEM;  in sbprof_tb_open()
424 		return -ENODEV;  in sbprof_tb_release()
450 		return -EFAULT;  in sbprof_tb_read()
457 	sample_left = TB_SAMPLE_SIZE - sample_off;  in sbprof_tb_read()
466 			*offp = cur_off + cur_count - err;  in sbprof_tb_read()
472 		size -= cur_count;  in sbprof_tb_read()
473 		sample_left -= cur_count;  in sbprof_tb_read()
520 		err = -EINVAL;  in sbprof_tb_ioctl()
551 		return -EIO;  in sbprof_tb_init()
568 	pr_info(DEVNAME ": initialized - tb_period = %lld\n",  in sbprof_tb_init()
591 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");