Second batch of AT91 cleanup for 3.18:

- Timer Counter (TC) fixup and cleanup:
   - fix segmentation fault when kexec-ing a kernel by masking
     TC interrupts at shutdown and probe time
   - use modern driver model: devm_*, probe function, sanitize IRQ request
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Merge tag 'at91-cleanup2' of git://github.com/at91linux/linux-at91 into next/cleanup

Pull "Second batch of AT91 cleanup for 3.18" from Nicolas Ferre:
- Timer Counter (TC) fixup and cleanup:
  - fix segmentation fault when kexec-ing a kernel by masking
    TC interrupts at shutdown and probe time
  - use modern driver model: devm_*, probe function, sanitize IRQ request

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

* tag 'at91-cleanup2' of git://github.com/at91linux/linux-at91:
  clocksource: tcb_clksrc: sanitize IRQ request
  ARM: at91/tclib: mask interruptions at shutdown and probe
  ARM: at91/tclib: move initialization from alloc to probe
  ARM: at91/tclib: prefer using of devm_* functions

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;

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)

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;

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