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drivers/misc/atmel_tclib.c
3.65 KB
2a341f5cf atmel_tc library |
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#include <linux/atmel_tc.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/init.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
2a341f5cf atmel_tc library |
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/* Number of bytes to reserve for the iomem resource */ #define ATMEL_TC_IOMEM_SIZE 256 /* * This is a thin library to solve the problem of how to portably allocate * one of the TC blocks. For simplicity, it doesn't currently expect to * share individual timers between different drivers. */ #if defined(CONFIG_AVR32) /* AVR32 has these divide PBB */ const u8 atmel_tc_divisors[5] = { 0, 4, 8, 16, 32, }; EXPORT_SYMBOL(atmel_tc_divisors); #elif defined(CONFIG_ARCH_AT91) /* AT91 has these divide MCK */ const u8 atmel_tc_divisors[5] = { 2, 8, 32, 128, 0, }; EXPORT_SYMBOL(atmel_tc_divisors); #endif static DEFINE_SPINLOCK(tc_list_lock); 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 *tc; struct platform_device *pdev = NULL; struct resource *r; spin_lock(&tc_list_lock); list_for_each_entry(tc, &tc_list, node) { if (tc->pdev->id == block) { pdev = tc->pdev; break; } } if (!pdev || tc->iomem) goto fail; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); r = request_mem_region(r->start, ATMEL_TC_IOMEM_SIZE, name); if (!r) goto fail; tc->regs = ioremap(r->start, ATMEL_TC_IOMEM_SIZE); if (!tc->regs) goto fail_ioremap; tc->iomem = r; out: spin_unlock(&tc_list_lock); return tc; fail_ioremap: |
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release_mem_region(r->start, ATMEL_TC_IOMEM_SIZE); |
2a341f5cf atmel_tc library |
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fail: tc = NULL; goto out; } 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. */ void atmel_tc_free(struct atmel_tc *tc) { spin_lock(&tc_list_lock); if (tc->regs) { iounmap(tc->regs); |
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release_mem_region(tc->iomem->start, ATMEL_TC_IOMEM_SIZE); |
2a341f5cf atmel_tc library |
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tc->regs = NULL; tc->iomem = NULL; } spin_unlock(&tc_list_lock); } EXPORT_SYMBOL_GPL(atmel_tc_free); 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; irq = platform_get_irq(pdev, 0); if (irq < 0) return -EINVAL; tc = kzalloc(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; } tc->clk[0] = clk; tc->clk[1] = 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"); if (IS_ERR(tc->clk[2])) tc->clk[2] = clk; tc->irq[0] = irq; tc->irq[1] = platform_get_irq(pdev, 1); if (tc->irq[1] < 0) tc->irq[1] = irq; tc->irq[2] = platform_get_irq(pdev, 2); if (tc->irq[2] < 0) tc->irq[2] = irq; spin_lock(&tc_list_lock); list_add_tail(&tc->node, &tc_list); spin_unlock(&tc_list_lock); return 0; } static struct platform_driver tc_driver = { .driver.name = "atmel_tcb", }; static int __init tc_init(void) { return platform_driver_probe(&tc_driver, tc_probe); } arch_initcall(tc_init); |