2 * @file op_model_mpcore.c
3 * MPCORE Event Monitor Driver
4 * @remark Copyright 2004 ARM SMP Development Team
5 * @remark Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com>
6 * @remark Copyright 2000-2004 MontaVista Software Inc
7 * @remark Copyright 2004 Dave Jiang <dave.jiang@intel.com>
8 * @remark Copyright 2004 Intel Corporation
9 * @remark Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk>
10 * @remark Copyright 2004 Oprofile Authors
12 * @remark Read the file COPYING
14 * @author Zwane Mwaikambo
17 * 0: PMN0 on CPU0, per-cpu configurable event counter
18 * 1: PMN1 on CPU0, per-cpu configurable event counter
29 * 12-19: configurable SCU event counters
33 #include <linux/types.h>
34 #include <linux/errno.h>
35 #include <linux/sched.h>
36 #include <linux/oprofile.h>
37 #include <linux/interrupt.h>
38 #include <linux/smp.h>
42 #include <asm/mach/irq.h>
43 #include <mach/hardware.h>
44 #include <mach/board-eb.h>
45 #include <asm/system.h>
47 #include "op_counter.h"
48 #include "op_arm_model.h"
49 #include "op_model_arm11_core.h"
50 #include "op_model_mpcore.h"
53 * MPCore SCU event monitor support
55 #define SCU_EVENTMONITORS_VA_BASE __io_address(REALVIEW_EB11MP_SCU_BASE + 0x10)
58 * Bitmask of used SCU counters
60 static unsigned int scu_em_used;
63 * 2 helper fns take a counter number from 0-7 (not the userspace-visible counter number)
65 static inline void scu_reset_counter(struct eventmonitor __iomem *emc, unsigned int n)
67 writel(-(u32)counter_config[SCU_COUNTER(n)].count, &emc->MC[n]);
70 static inline void scu_set_event(struct eventmonitor __iomem *emc, unsigned int n, u32 event)
73 writeb(event, &emc->MCEB[n]);
77 * SCU counters' IRQ handler (one IRQ per counter => 2 IRQs per CPU)
79 static irqreturn_t scu_em_interrupt(int irq, void *arg)
81 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
84 cnt = irq - IRQ_EB11MP_PMU_SCU0;
85 oprofile_add_sample(get_irq_regs(), SCU_COUNTER(cnt));
86 scu_reset_counter(emc, cnt);
88 /* Clear overflow flag for this counter */
89 writel(1 << (cnt + 16), &emc->PMCR);
94 /* Configure just the SCU counters that the user has requested */
95 static void scu_setup(void)
97 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
102 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
103 if (counter_config[SCU_COUNTER(i)].enabled &&
104 counter_config[SCU_COUNTER(i)].event) {
105 scu_set_event(emc, i, 0); /* disable counter for now */
106 scu_em_used |= 1 << i;
111 static int scu_start(void)
113 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
114 unsigned int temp, i;
119 * request the SCU counter interrupts that we need
121 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
122 if (scu_em_used & (1 << i)) {
123 ret = request_irq(IRQ_EB11MP_PMU_SCU0 + i, scu_em_interrupt, IRQF_DISABLED, "SCU PMU", NULL);
125 printk(KERN_ERR "oprofile: unable to request IRQ%u for SCU Event Monitor\n",
126 IRQ_EB11MP_PMU_SCU0 + i);
133 * clear overflow and enable interrupt for all used counters
135 temp = readl(&emc->PMCR);
136 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
137 if (scu_em_used & (1 << i)) {
138 scu_reset_counter(emc, i);
139 event = counter_config[SCU_COUNTER(i)].event;
140 scu_set_event(emc, i, event);
142 /* clear overflow/interrupt */
143 temp |= 1 << (i + 16);
144 /* enable interrupt*/
145 temp |= 1 << (i + 8);
149 /* Enable all 8 counters */
151 writel(temp, &emc->PMCR);
157 free_irq(IRQ_EB11MP_PMU_SCU0 + i, NULL);
161 static void scu_stop(void)
163 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
164 unsigned int temp, i;
166 /* Disable counter interrupts */
167 /* Don't disable all 8 counters (with the E bit) as they may be in use */
168 temp = readl(&emc->PMCR);
169 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
170 if (scu_em_used & (1 << i))
171 temp &= ~(1 << (i + 8));
173 writel(temp, &emc->PMCR);
175 /* Free counter interrupts and reset counters */
176 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
177 if (scu_em_used & (1 << i)) {
178 scu_reset_counter(emc, i);
179 free_irq(IRQ_EB11MP_PMU_SCU0 + i, NULL);
184 struct em_function_data {
189 static void em_func(void *data)
191 struct em_function_data *d = data;
197 static int em_call_function(int (*fn)(void))
199 struct em_function_data data;
205 smp_call_function(em_func, &data, 1);
213 * Glue to stick the individual ARM11 PMUs and the SCU
214 * into the oprofile framework.
216 static int em_setup_ctrs(void)
220 /* Configure CPU counters by cross-calling to the other CPUs */
221 ret = em_call_function(arm11_setup_pmu);
228 static int arm11_irqs[] = {
229 [0] = IRQ_EB11MP_PMU_CPU0,
230 [1] = IRQ_EB11MP_PMU_CPU1,
231 [2] = IRQ_EB11MP_PMU_CPU2,
232 [3] = IRQ_EB11MP_PMU_CPU3
235 static int em_start(void)
239 ret = arm11_request_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
241 em_call_function(arm11_start_pmu);
245 arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
250 static void em_stop(void)
252 em_call_function(arm11_stop_pmu);
253 arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
258 * Why isn't there a function to route an IRQ to a specific CPU in
261 static void em_route_irq(int irq, unsigned int cpu)
263 struct irq_desc *desc = irq_desc + irq;
264 const struct cpumask *mask = cpumask_of(cpu);
266 spin_lock_irq(&desc->lock);
267 cpumask_copy(desc->affinity, mask);
268 desc->chip->set_affinity(irq, mask);
269 spin_unlock_irq(&desc->lock);
272 static int em_setup(void)
275 * Send SCU PMU interrupts to the "owner" CPU.
277 em_route_irq(IRQ_EB11MP_PMU_SCU0, 0);
278 em_route_irq(IRQ_EB11MP_PMU_SCU1, 0);
279 em_route_irq(IRQ_EB11MP_PMU_SCU2, 1);
280 em_route_irq(IRQ_EB11MP_PMU_SCU3, 1);
281 em_route_irq(IRQ_EB11MP_PMU_SCU4, 2);
282 em_route_irq(IRQ_EB11MP_PMU_SCU5, 2);
283 em_route_irq(IRQ_EB11MP_PMU_SCU6, 3);
284 em_route_irq(IRQ_EB11MP_PMU_SCU7, 3);
287 * Send CP15 PMU interrupts to the owner CPU.
289 em_route_irq(IRQ_EB11MP_PMU_CPU0, 0);
290 em_route_irq(IRQ_EB11MP_PMU_CPU1, 1);
291 em_route_irq(IRQ_EB11MP_PMU_CPU2, 2);
292 em_route_irq(IRQ_EB11MP_PMU_CPU3, 3);
297 struct op_arm_model_spec op_mpcore_spec = {
299 .num_counters = MPCORE_NUM_COUNTERS,
300 .setup_ctrs = em_setup_ctrs,
303 .name = "arm/mpcore",