diff options
| -rw-r--r-- | drivers/clocksource/tcb_clksrc.c | 2 | ||||
| -rw-r--r-- | drivers/misc/atmel_tclib.c | 71 | ||||
| -rw-r--r-- | drivers/pwm/pwm-atmel-tcb.c | 2 | ||||
| -rw-r--r-- | include/linux/atmel_tc.h | 8 |
4 files changed, 29 insertions, 54 deletions
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index a8d7ea1..f922e81 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -279,7 +279,7 @@ 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 b514a2d..d505d1e 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); @@ -142,9 +108,7 @@ 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; irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -160,12 +124,21 @@ static int __init tc_probe(struct platform_device *pdev) 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) { const struct of_device_id *match; 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; 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..d8aa884 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) */ |
