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-rw-r--r--drivers/clocksource/tcb_clksrc.c15
-rw-r--r--drivers/misc/atmel_tclib.c101
-rw-r--r--drivers/pwm/pwm-atmel-tcb.c2
-rw-r--r--include/linux/atmel_tc.h13
4 files changed, 60 insertions, 71 deletions
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index a8d7ea1..8bdbc45 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -178,12 +178,6 @@ static irqreturn_t ch2_irq(int irq, void *handle)
return IRQ_NONE;
}
-static struct irqaction tc_irqaction = {
- .name = "tc_clkevt",
- .flags = IRQF_TIMER,
- .handler = ch2_irq,
-};
-
static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
{
int ret;
@@ -198,15 +192,16 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
clkevt.regs = tc->regs;
clkevt.clk = t2_clk;
- tc_irqaction.dev_id = &clkevt;
timer_clock = clk32k_divisor_idx;
clkevt.clkevt.cpumask = cpumask_of(0);
- ret = setup_irq(irq, &tc_irqaction);
- if (ret)
+ ret = request_irq(irq, ch2_irq, IRQF_TIMER, "tc_clkevt", &clkevt);
+ if (ret) {
+ clk_disable_unprepare(t2_clk);
return ret;
+ }
clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
@@ -279,7 +274,7 @@ static int __init tcb_clksrc_init(void)
int i;
int ret;
- tc = atmel_tc_alloc(CONFIG_ATMEL_TCB_CLKSRC_BLOCK, clksrc.name);
+ tc = atmel_tc_alloc(CONFIG_ATMEL_TCB_CLKSRC_BLOCK);
if (!tc) {
pr_debug("can't alloc TC for clocksource\n");
return -ENODEV;
diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index c8d8e38..0ca05c3 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -35,60 +35,31 @@ static LIST_HEAD(tc_list);
/**
* atmel_tc_alloc - allocate a specified TC block
* @block: which block to allocate
- * @name: name to be associated with the iomem resource
*
* Caller allocates a block. If it is available, a pointer to a
* pre-initialized struct atmel_tc is returned. The caller can access
* the registers directly through the "regs" field.
*/
-struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name)
+struct atmel_tc *atmel_tc_alloc(unsigned block)
{
struct atmel_tc *tc;
struct platform_device *pdev = NULL;
- struct resource *r;
- size_t size;
spin_lock(&tc_list_lock);
list_for_each_entry(tc, &tc_list, node) {
- if (tc->pdev->dev.of_node) {
- if (of_alias_get_id(tc->pdev->dev.of_node, "tcb")
- == block) {
- pdev = tc->pdev;
- break;
- }
- } else if (tc->pdev->id == block) {
+ if (tc->allocated)
+ continue;
+
+ if ((tc->pdev->dev.of_node && tc->id == block) ||
+ (tc->pdev->id == block)) {
pdev = tc->pdev;
+ tc->allocated = true;
break;
}
}
-
- if (!pdev || tc->iomem)
- goto fail;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!r)
- goto fail;
-
- size = resource_size(r);
- r = request_mem_region(r->start, size, name);
- if (!r)
- goto fail;
-
- tc->regs = ioremap(r->start, size);
- if (!tc->regs)
- goto fail_ioremap;
-
- tc->iomem = r;
-
-out:
spin_unlock(&tc_list_lock);
- return tc;
-fail_ioremap:
- release_mem_region(r->start, size);
-fail:
- tc = NULL;
- goto out;
+ return pdev ? tc : NULL;
}
EXPORT_SYMBOL_GPL(atmel_tc_alloc);
@@ -96,19 +67,14 @@ EXPORT_SYMBOL_GPL(atmel_tc_alloc);
* atmel_tc_free - release a specified TC block
* @tc: Timer/counter block that was returned by atmel_tc_alloc()
*
- * This reverses the effect of atmel_tc_alloc(), unmapping the I/O
- * registers, invalidating the resource returned by that routine and
- * making the TC available to other drivers.
+ * This reverses the effect of atmel_tc_alloc(), invalidating the resource
+ * returned by that routine and making the TC available to other drivers.
*/
void atmel_tc_free(struct atmel_tc *tc)
{
spin_lock(&tc_list_lock);
- if (tc->regs) {
- iounmap(tc->regs);
- release_mem_region(tc->iomem->start, resource_size(tc->iomem));
- tc->regs = NULL;
- tc->iomem = NULL;
- }
+ if (tc->allocated)
+ tc->allocated = false;
spin_unlock(&tc_list_lock);
}
EXPORT_SYMBOL_GPL(atmel_tc_free);
@@ -142,25 +108,27 @@ static int __init tc_probe(struct platform_device *pdev)
struct atmel_tc *tc;
struct clk *clk;
int irq;
-
- if (!platform_get_resource(pdev, IORESOURCE_MEM, 0))
- return -EINVAL;
+ struct resource *r;
+ unsigned int i;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
- tc = kzalloc(sizeof(struct atmel_tc), GFP_KERNEL);
+ tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL);
if (!tc)
return -ENOMEM;
tc->pdev = pdev;
- clk = clk_get(&pdev->dev, "t0_clk");
- if (IS_ERR(clk)) {
- kfree(tc);
- return -EINVAL;
- }
+ clk = devm_clk_get(&pdev->dev, "t0_clk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ tc->regs = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(tc->regs))
+ return PTR_ERR(tc->regs);
/* Now take SoC information if available */
if (pdev->dev.of_node) {
@@ -168,13 +136,17 @@ static int __init tc_probe(struct platform_device *pdev)
match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node);
if (match)
tc->tcb_config = match->data;
+
+ tc->id = of_alias_get_id(tc->pdev->dev.of_node, "tcb");
+ } else {
+ tc->id = pdev->id;
}
tc->clk[0] = clk;
- tc->clk[1] = clk_get(&pdev->dev, "t1_clk");
+ tc->clk[1] = devm_clk_get(&pdev->dev, "t1_clk");
if (IS_ERR(tc->clk[1]))
tc->clk[1] = clk;
- tc->clk[2] = clk_get(&pdev->dev, "t2_clk");
+ tc->clk[2] = devm_clk_get(&pdev->dev, "t2_clk");
if (IS_ERR(tc->clk[2]))
tc->clk[2] = clk;
@@ -186,18 +158,33 @@ static int __init tc_probe(struct platform_device *pdev)
if (tc->irq[2] < 0)
tc->irq[2] = irq;
+ for (i = 0; i < 3; i++)
+ writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
+
spin_lock(&tc_list_lock);
list_add_tail(&tc->node, &tc_list);
spin_unlock(&tc_list_lock);
+ platform_set_drvdata(pdev, tc);
+
return 0;
}
+static void tc_shutdown(struct platform_device *pdev)
+{
+ int i;
+ struct atmel_tc *tc = platform_get_drvdata(pdev);
+
+ for (i = 0; i < 3; i++)
+ writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
+}
+
static struct platform_driver tc_driver = {
.driver = {
.name = "atmel_tcb",
.of_match_table = of_match_ptr(atmel_tcb_dt_ids),
},
+ .shutdown = tc_shutdown,
};
static int __init tc_init(void)
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index f3dcd02..d56e5b7 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -379,7 +379,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
return err;
}
- tc = atmel_tc_alloc(tcblock, "tcb-pwm");
+ tc = atmel_tc_alloc(tcblock);
if (tc == NULL) {
dev_err(&pdev->dev, "failed to allocate Timer Counter Block\n");
return -ENOMEM;
diff --git a/include/linux/atmel_tc.h b/include/linux/atmel_tc.h
index 89a931b..b87c1c7 100644
--- a/include/linux/atmel_tc.h
+++ b/include/linux/atmel_tc.h
@@ -44,12 +44,13 @@ struct atmel_tcb_config {
/**
* struct atmel_tc - information about a Timer/Counter Block
* @pdev: physical device
- * @iomem: resource associated with the I/O register
* @regs: mapping through which the I/O registers can be accessed
+ * @id: block id
* @tcb_config: configuration data from SoC
* @irq: irq for each of the three channels
* @clk: internal clock source for each of the three channels
* @node: list node, for tclib internal use
+ * @allocated: if already used, for tclib internal use
*
* On some platforms, each TC channel has its own clocks and IRQs,
* while on others, all TC channels share the same clock and IRQ.
@@ -61,15 +62,16 @@ struct atmel_tcb_config {
*/
struct atmel_tc {
struct platform_device *pdev;
- struct resource *iomem;
void __iomem *regs;
+ int id;
const struct atmel_tcb_config *tcb_config;
int irq[3];
struct clk *clk[3];
struct list_head node;
+ bool allocated;
};
-extern struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name);
+extern struct atmel_tc *atmel_tc_alloc(unsigned block);
extern void atmel_tc_free(struct atmel_tc *tc);
/* platform-specific ATMEL_TC_TIMER_CLOCKx divisors (0 means 32KiHz) */
@@ -258,5 +260,10 @@ extern const u8 atmel_tc_divisors[5];
#define ATMEL_TC_LDRAS (1 << 5) /* RA loading */
#define ATMEL_TC_LDRBS (1 << 6) /* RB loading */
#define ATMEL_TC_ETRGS (1 << 7) /* external trigger */
+#define ATMEL_TC_ALL_IRQ (ATMEL_TC_COVFS | ATMEL_TC_LOVRS | \
+ ATMEL_TC_CPAS | ATMEL_TC_CPBS | \
+ ATMEL_TC_CPCS | ATMEL_TC_LDRAS | \
+ ATMEL_TC_LDRBS | ATMEL_TC_ETRGS) \
+ /* all IRQs */
#endif
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