#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> #include <linux/module.h> #include <linux/slab.h> #include <linux/export.h> #include <linux/of.h> /* * 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 * * 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) { struct atmel_tc *tc; struct platform_device *pdev = NULL; spin_lock(&tc_list_lock); list_for_each_entry(tc, &tc_list, node) { if (tc->allocated) continue; if ((tc->pdev->dev.of_node && tc->id == block) || (tc->pdev->id == block)) { pdev = tc->pdev; tc->allocated = true; break; } } spin_unlock(&tc_list_lock); return pdev ? tc : NULL; } 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(), 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->allocated) tc->allocated = false; spin_unlock(&tc_list_lock); } EXPORT_SYMBOL_GPL(atmel_tc_free); #if defined(CONFIG_OF) static struct atmel_tcb_config tcb_rm9200_config = { .counter_width = 16, }; static struct atmel_tcb_config tcb_sam9x5_config = { .counter_width = 32, }; static const struct of_device_id atmel_tcb_dt_ids[] = { { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, }, { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_tcb_dt_ids); #endif static int __init tc_probe(struct platform_device *pdev) { struct atmel_tc *tc; struct clk *clk; int irq; struct resource *r; unsigned int i; irq = platform_get_irq(pdev, 0); if (irq < 0) return -EINVAL; tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL); if (!tc) return -ENOMEM; tc->pdev = pdev; clk = devm_clk_get(&pdev->dev, "t0_clk"); if (IS_ERR(clk)) return PTR_ERR(clk); tc->slow_clk = devm_clk_get(&pdev->dev, "slow_clk"); if (IS_ERR(tc->slow_clk)) return PTR_ERR(tc->slow_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; tc->clk[1] = devm_clk_get(&pdev->dev, "t1_clk"); if (IS_ERR(tc->clk[1])) tc->clk[1] = clk; tc->clk[2] = devm_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; 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) { return platform_driver_probe(&tc_driver, tc_probe); } arch_initcall(tc_init);