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 <asm/system.h>
46 #include "op_counter.h"
47 #include "op_arm_model.h"
48 #include "op_model_arm11_core.h"
49 #include "op_model_mpcore.h"
52 * MPCore SCU event monitor support
54 #define SCU_EVENTMONITORS_VA_BASE __io_address(REALVIEW_EB11MP_SCU_BASE + 0x10)
57 * Bitmask of used SCU counters
59 static unsigned int scu_em_used;
62 * 2 helper fns take a counter number from 0-7 (not the userspace-visible counter number)
64 static inline void scu_reset_counter(struct eventmonitor __iomem *emc, unsigned int n)
66 writel(-(u32)counter_config[SCU_COUNTER(n)].count, &emc->MC[n]);
69 static inline void scu_set_event(struct eventmonitor __iomem *emc, unsigned int n, u32 event)
72 writeb(event, &emc->MCEB[n]);
76 * SCU counters' IRQ handler (one IRQ per counter => 2 IRQs per CPU)
78 static irqreturn_t scu_em_interrupt(int irq, void *arg)
80 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
83 cnt = irq - IRQ_EB11MP_PMU_SCU0;
84 oprofile_add_sample(get_irq_regs(), SCU_COUNTER(cnt));
85 scu_reset_counter(emc, cnt);
87 /* Clear overflow flag for this counter */
88 writel(1 << (cnt + 16), &emc->PMCR);
93 /* Configure just the SCU counters that the user has requested */
94 static void scu_setup(void)
96 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
101 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
102 if (counter_config[SCU_COUNTER(i)].enabled &&
103 counter_config[SCU_COUNTER(i)].event) {
104 scu_set_event(emc, i, 0); /* disable counter for now */
105 scu_em_used |= 1 << i;
110 static int scu_start(void)
112 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
113 unsigned int temp, i;
118 * request the SCU counter interrupts that we need
120 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
121 if (scu_em_used & (1 << i)) {
122 ret = request_irq(IRQ_EB11MP_PMU_SCU0 + i, scu_em_interrupt, IRQF_DISABLED, "SCU PMU", NULL);
124 printk(KERN_ERR "oprofile: unable to request IRQ%u for SCU Event Monitor\n",
125 IRQ_EB11MP_PMU_SCU0 + i);
132 * clear overflow and enable interrupt for all used counters
134 temp = readl(&emc->PMCR);
135 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
136 if (scu_em_used & (1 << i)) {
137 scu_reset_counter(emc, i);
138 event = counter_config[SCU_COUNTER(i)].event;
139 scu_set_event(emc, i, event);
141 /* clear overflow/interrupt */
142 temp |= 1 << (i + 16);
143 /* enable interrupt*/
144 temp |= 1 << (i + 8);
148 /* Enable all 8 counters */
150 writel(temp, &emc->PMCR);
156 free_irq(IRQ_EB11MP_PMU_SCU0 + i, NULL);
160 static void scu_stop(void)
162 struct eventmonitor __iomem *emc = SCU_EVENTMONITORS_VA_BASE;
163 unsigned int temp, i;
165 /* Disable counter interrupts */
166 /* Don't disable all 8 counters (with the E bit) as they may be in use */
167 temp = readl(&emc->PMCR);
168 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
169 if (scu_em_used & (1 << i))
170 temp &= ~(1 << (i + 8));
172 writel(temp, &emc->PMCR);
174 /* Free counter interrupts and reset counters */
175 for (i = 0; i < NUM_SCU_COUNTERS; i++) {
176 if (scu_em_used & (1 << i)) {
177 scu_reset_counter(emc, i);
178 free_irq(IRQ_EB11MP_PMU_SCU0 + i, NULL);
183 struct em_function_data {
188 static void em_func(void *data)
190 struct em_function_data *d = data;
196 static int em_call_function(int (*fn)(void))
198 struct em_function_data data;
204 smp_call_function(em_func, &data, 1);
212 * Glue to stick the individual ARM11 PMUs and the SCU
213 * into the oprofile framework.
215 static int em_setup_ctrs(void)
219 /* Configure CPU counters by cross-calling to the other CPUs */
220 ret = em_call_function(arm11_setup_pmu);
227 static int arm11_irqs[] = {
228 [0] = IRQ_EB11MP_PMU_CPU0,
229 [1] = IRQ_EB11MP_PMU_CPU1,
230 [2] = IRQ_EB11MP_PMU_CPU2,
231 [3] = IRQ_EB11MP_PMU_CPU3
234 static int em_start(void)
238 ret = arm11_request_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
240 em_call_function(arm11_start_pmu);
244 arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
249 static void em_stop(void)
251 em_call_function(arm11_stop_pmu);
252 arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
257 * Why isn't there a function to route an IRQ to a specific CPU in
260 static void em_route_irq(int irq, unsigned int cpu)
262 struct irq_desc *desc = irq_desc + irq;
263 const struct cpumask *mask = cpumask_of(cpu);
265 spin_lock_irq(&desc->lock);
266 desc->affinity = *mask;
267 desc->chip->set_affinity(irq, mask);
268 spin_unlock_irq(&desc->lock);
271 static int em_setup(void)
274 * Send SCU PMU interrupts to the "owner" CPU.
276 em_route_irq(IRQ_EB11MP_PMU_SCU0, 0);
277 em_route_irq(IRQ_EB11MP_PMU_SCU1, 0);
278 em_route_irq(IRQ_EB11MP_PMU_SCU2, 1);
279 em_route_irq(IRQ_EB11MP_PMU_SCU3, 1);
280 em_route_irq(IRQ_EB11MP_PMU_SCU4, 2);
281 em_route_irq(IRQ_EB11MP_PMU_SCU5, 2);
282 em_route_irq(IRQ_EB11MP_PMU_SCU6, 3);
283 em_route_irq(IRQ_EB11MP_PMU_SCU7, 3);
286 * Send CP15 PMU interrupts to the owner CPU.
288 em_route_irq(IRQ_EB11MP_PMU_CPU0, 0);
289 em_route_irq(IRQ_EB11MP_PMU_CPU1, 1);
290 em_route_irq(IRQ_EB11MP_PMU_CPU2, 2);
291 em_route_irq(IRQ_EB11MP_PMU_CPU3, 3);
296 struct op_arm_model_spec op_mpcore_spec = {
298 .num_counters = MPCORE_NUM_COUNTERS,
299 .setup_ctrs = em_setup_ctrs,
302 .name = "arm/mpcore",