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path: root/drivers/irqchip/irq-stm32-exti.c
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Diffstat (limited to 'drivers/irqchip/irq-stm32-exti.c')
-rw-r--r--drivers/irqchip/irq-stm32-exti.c122
1 files changed, 103 insertions, 19 deletions
diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index 0a2088e12d96..6edfd4bfa169 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c
@@ -6,6 +6,8 @@
*/
#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/hwspinlock.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
@@ -20,6 +22,9 @@
#define IRQS_PER_BANK 32
+#define HWSPNLCK_TIMEOUT 1000 /* usec */
+#define HWSPNLCK_RETRY_DELAY 100 /* usec */
+
struct stm32_exti_bank {
u32 imr_ofst;
u32 emr_ofst;
@@ -32,6 +37,12 @@ struct stm32_exti_bank {
#define UNDEF_REG ~0
+enum stm32_exti_hwspinlock {
+ HWSPINLOCK_UNKNOWN,
+ HWSPINLOCK_NONE,
+ HWSPINLOCK_READY,
+};
+
struct stm32_desc_irq {
u32 exti;
u32 irq_parent;
@@ -58,6 +69,9 @@ struct stm32_exti_host_data {
void __iomem *base;
struct stm32_exti_chip_data *chips_data;
const struct stm32_exti_drv_data *drv_data;
+ struct device_node *node;
+ enum stm32_exti_hwspinlock hwlock_state;
+ struct hwspinlock *hwlock;
};
static struct stm32_exti_host_data *stm32_host_data;
@@ -269,6 +283,64 @@ static int stm32_exti_set_type(struct irq_data *d,
return 0;
}
+static int stm32_exti_hwspin_lock(struct stm32_exti_chip_data *chip_data)
+{
+ struct stm32_exti_host_data *host_data = chip_data->host_data;
+ struct hwspinlock *hwlock;
+ int id, ret = 0, timeout = 0;
+
+ /* first time, check for hwspinlock availability */
+ if (unlikely(host_data->hwlock_state == HWSPINLOCK_UNKNOWN)) {
+ id = of_hwspin_lock_get_id(host_data->node, 0);
+ if (id >= 0) {
+ hwlock = hwspin_lock_request_specific(id);
+ if (hwlock) {
+ /* found valid hwspinlock */
+ host_data->hwlock_state = HWSPINLOCK_READY;
+ host_data->hwlock = hwlock;
+ pr_debug("%s hwspinlock = %d\n", __func__, id);
+ } else {
+ host_data->hwlock_state = HWSPINLOCK_NONE;
+ }
+ } else if (id != -EPROBE_DEFER) {
+ host_data->hwlock_state = HWSPINLOCK_NONE;
+ } else {
+ /* hwspinlock driver shall be ready at that stage */
+ ret = -EPROBE_DEFER;
+ }
+ }
+
+ if (likely(host_data->hwlock_state == HWSPINLOCK_READY)) {
+ /*
+ * Use the x_raw API since we are under spin_lock protection.
+ * Do not use the x_timeout API because we are under irq_disable
+ * mode (see __setup_irq())
+ */
+ do {
+ ret = hwspin_trylock_raw(host_data->hwlock);
+ if (!ret)
+ return 0;
+
+ udelay(HWSPNLCK_RETRY_DELAY);
+ timeout += HWSPNLCK_RETRY_DELAY;
+ } while (timeout < HWSPNLCK_TIMEOUT);
+
+ if (ret == -EBUSY)
+ ret = -ETIMEDOUT;
+ }
+
+ if (ret)
+ pr_err("%s can't get hwspinlock (%d)\n", __func__, ret);
+
+ return ret;
+}
+
+static void stm32_exti_hwspin_unlock(struct stm32_exti_chip_data *chip_data)
+{
+ if (likely(chip_data->host_data->hwlock_state == HWSPINLOCK_READY))
+ hwspin_unlock_raw(chip_data->host_data->hwlock);
+}
+
static int stm32_irq_set_type(struct irq_data *d, unsigned int type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
@@ -279,21 +351,26 @@ static int stm32_irq_set_type(struct irq_data *d, unsigned int type)
irq_gc_lock(gc);
+ err = stm32_exti_hwspin_lock(chip_data);
+ if (err)
+ goto unlock;
+
rtsr = irq_reg_readl(gc, stm32_bank->rtsr_ofst);
ftsr = irq_reg_readl(gc, stm32_bank->ftsr_ofst);
err = stm32_exti_set_type(d, type, &rtsr, &ftsr);
- if (err) {
- irq_gc_unlock(gc);
- return err;
- }
+ if (err)
+ goto unspinlock;
irq_reg_writel(gc, rtsr, stm32_bank->rtsr_ofst);
irq_reg_writel(gc, ftsr, stm32_bank->ftsr_ofst);
+unspinlock:
+ stm32_exti_hwspin_unlock(chip_data);
+unlock:
irq_gc_unlock(gc);
- return 0;
+ return err;
}
static void stm32_chip_suspend(struct stm32_exti_chip_data *chip_data,
@@ -460,20 +537,27 @@ static int stm32_exti_h_set_type(struct irq_data *d, unsigned int type)
int err;
raw_spin_lock(&chip_data->rlock);
+
+ err = stm32_exti_hwspin_lock(chip_data);
+ if (err)
+ goto unlock;
+
rtsr = readl_relaxed(base + stm32_bank->rtsr_ofst);
ftsr = readl_relaxed(base + stm32_bank->ftsr_ofst);
err = stm32_exti_set_type(d, type, &rtsr, &ftsr);
- if (err) {
- raw_spin_unlock(&chip_data->rlock);
- return err;
- }
+ if (err)
+ goto unspinlock;
writel_relaxed(rtsr, base + stm32_bank->rtsr_ofst);
writel_relaxed(ftsr, base + stm32_bank->ftsr_ofst);
+
+unspinlock:
+ stm32_exti_hwspin_unlock(chip_data);
+unlock:
raw_spin_unlock(&chip_data->rlock);
- return 0;
+ return err;
}
static int stm32_exti_h_set_wake(struct irq_data *d, unsigned int on)
@@ -599,6 +683,8 @@ stm32_exti_host_data *stm32_exti_host_init(const struct stm32_exti_drv_data *dd,
return NULL;
host_data->drv_data = dd;
+ host_data->node = node;
+ host_data->hwlock_state = HWSPINLOCK_UNKNOWN;
host_data->chips_data = kcalloc(dd->bank_nr,
sizeof(struct stm32_exti_chip_data),
GFP_KERNEL);
@@ -625,8 +711,7 @@ free_host_data:
static struct
stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
- u32 bank_idx,
- struct device_node *node)
+ u32 bank_idx)
{
const struct stm32_exti_bank *stm32_bank;
struct stm32_exti_chip_data *chip_data;
@@ -656,8 +741,7 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
if (stm32_bank->fpr_ofst != UNDEF_REG)
writel_relaxed(~0UL, base + stm32_bank->fpr_ofst);
- pr_info("%s: bank%d, External IRQs available:%#x\n",
- node->full_name, bank_idx, irqs_mask);
+ pr_info("%pOF: bank%d\n", h_data->node, bank_idx);
return chip_data;
}
@@ -678,8 +762,8 @@ static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
domain = irq_domain_add_linear(node, drv_data->bank_nr * IRQS_PER_BANK,
&irq_exti_domain_ops, NULL);
if (!domain) {
- pr_err("%s: Could not register interrupt domain.\n",
- node->name);
+ pr_err("%pOFn: Could not register interrupt domain.\n",
+ node);
ret = -ENOMEM;
goto out_unmap;
}
@@ -697,7 +781,7 @@ static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
struct stm32_exti_chip_data *chip_data;
stm32_bank = drv_data->exti_banks[i];
- chip_data = stm32_exti_chip_init(host_data, i, node);
+ chip_data = stm32_exti_chip_init(host_data, i);
gc = irq_get_domain_generic_chip(domain, i * IRQS_PER_BANK);
@@ -760,7 +844,7 @@ __init stm32_exti_hierarchy_init(const struct stm32_exti_drv_data *drv_data,
return -ENOMEM;
for (i = 0; i < drv_data->bank_nr; i++)
- stm32_exti_chip_init(host_data, i, node);
+ stm32_exti_chip_init(host_data, i);
domain = irq_domain_add_hierarchy(parent_domain, 0,
drv_data->bank_nr * IRQS_PER_BANK,
@@ -768,7 +852,7 @@ __init stm32_exti_hierarchy_init(const struct stm32_exti_drv_data *drv_data,
host_data);
if (!domain) {
- pr_err("%s: Could not register exti domain.\n", node->name);
+ pr_err("%pOFn: Could not register exti domain.\n", node);
ret = -ENOMEM;
goto out_unmap;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 10:07:41 +0100