^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <soc/at91/atmel_tcb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * This is a thin library to solve the problem of how to portably allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * one of the TC blocks. For simplicity, it doesn't currently expect to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * share individual timers between different drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #if defined(CONFIG_AVR32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* AVR32 has these divide PBB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) const u8 atmel_tc_divisors[5] = { 0, 4, 8, 16, 32, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) EXPORT_SYMBOL(atmel_tc_divisors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #elif defined(CONFIG_ARCH_AT91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /* AT91 has these divide MCK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) const u8 atmel_tc_divisors[5] = { 2, 8, 32, 128, 0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) EXPORT_SYMBOL(atmel_tc_divisors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static DEFINE_SPINLOCK(tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static LIST_HEAD(tc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * atmel_tc_alloc - allocate a specified TC block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * @block: which block to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Caller allocates a block. If it is available, a pointer to a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * pre-initialized struct atmel_tc is returned. The caller can access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * the registers directly through the "regs" field.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct atmel_tc *atmel_tc_alloc(unsigned block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct atmel_tc *tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct platform_device *pdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) spin_lock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) list_for_each_entry(tc, &tc_list, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (tc->allocated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if ((tc->pdev->dev.of_node && tc->id == block) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) (tc->pdev->id == block)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pdev = tc->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) tc->allocated = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) spin_unlock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return pdev ? tc : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) EXPORT_SYMBOL_GPL(atmel_tc_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * atmel_tc_free - release a specified TC block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * @tc: Timer/counter block that was returned by atmel_tc_alloc()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * This reverses the effect of atmel_tc_alloc(), invalidating the resource
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * returned by that routine and making the TC available to other drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) void atmel_tc_free(struct atmel_tc *tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) spin_lock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (tc->allocated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) tc->allocated = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) spin_unlock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) EXPORT_SYMBOL_GPL(atmel_tc_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #if defined(CONFIG_OF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static struct atmel_tcb_config tcb_rm9200_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .counter_width = 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static struct atmel_tcb_config tcb_sam9x5_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .counter_width = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static const struct of_device_id atmel_tcb_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .compatible = "atmel,at91rm9200-tcb",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .data = &tcb_rm9200_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .compatible = "atmel,at91sam9x5-tcb",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .data = &tcb_sam9x5_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* sentinel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) MODULE_DEVICE_TABLE(of, atmel_tcb_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int __init tc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct atmel_tc *tc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (of_get_child_count(pdev->dev.of_node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) tc->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) clk = devm_clk_get(&pdev->dev, "t0_clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (IS_ERR(clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return PTR_ERR(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) tc->slow_clk = devm_clk_get(&pdev->dev, "slow_clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (IS_ERR(tc->slow_clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return PTR_ERR(tc->slow_clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) tc->regs = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (IS_ERR(tc->regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return PTR_ERR(tc->regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /* Now take SoC information if available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (pdev->dev.of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) tc->tcb_config = match->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) tc->id = of_alias_get_id(tc->pdev->dev.of_node, "tcb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) tc->id = pdev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) tc->clk[0] = clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) tc->clk[1] = devm_clk_get(&pdev->dev, "t1_clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (IS_ERR(tc->clk[1]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) tc->clk[1] = clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) tc->clk[2] = devm_clk_get(&pdev->dev, "t2_clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (IS_ERR(tc->clk[2]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) tc->clk[2] = clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) tc->irq[0] = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) tc->irq[1] = platform_get_irq(pdev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (tc->irq[1] < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) tc->irq[1] = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) tc->irq[2] = platform_get_irq(pdev, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (tc->irq[2] < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) tc->irq[2] = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) for (i = 0; i < 3; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) spin_lock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) list_add_tail(&tc->node, &tc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) spin_unlock(&tc_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) platform_set_drvdata(pdev, tc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static void tc_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct atmel_tc *tc = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) for (i = 0; i < 3; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static struct platform_driver tc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .name = "atmel_tcb",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .of_match_table = of_match_ptr(atmel_tcb_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .shutdown = tc_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int __init tc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return platform_driver_probe(&tc_driver, tc_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) arch_initcall(tc_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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