| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2017 Microchip Corporation |
| * Wenyou.Yang <wenyou.yang@microchip.com> |
| */ |
| |
| #include <common.h> |
| #include <clk.h> |
| #include <dm.h> |
| #include <timer.h> |
| #include <asm/io.h> |
| #include <linux/bitops.h> |
| |
| #define AT91_PIT_VALUE 0xfffff |
| #define AT91_PIT_PITEN BIT(24) /* Timer Enabled */ |
| |
| struct atmel_pit_regs { |
| u32 mode; |
| u32 status; |
| u32 value; |
| u32 value_image; |
| }; |
| |
| struct atmel_pit_platdata { |
| struct atmel_pit_regs *regs; |
| }; |
| |
| static u64 atmel_pit_get_count(struct udevice *dev) |
| { |
| struct atmel_pit_platdata *plat = dev_get_platdata(dev); |
| struct atmel_pit_regs *const regs = plat->regs; |
| u32 val = readl(®s->value_image); |
| |
| return timer_conv_64(val); |
| } |
| |
| static int atmel_pit_probe(struct udevice *dev) |
| { |
| struct atmel_pit_platdata *plat = dev_get_platdata(dev); |
| struct atmel_pit_regs *const regs = plat->regs; |
| struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| struct clk clk; |
| ulong clk_rate; |
| int ret; |
| |
| ret = clk_get_by_index(dev, 0, &clk); |
| if (ret) |
| return -EINVAL; |
| |
| clk_rate = clk_get_rate(&clk); |
| if (!clk_rate) |
| return -EINVAL; |
| |
| uc_priv->clock_rate = clk_rate / 16; |
| |
| writel(AT91_PIT_VALUE | AT91_PIT_PITEN, ®s->mode); |
| |
| return 0; |
| } |
| |
| static int atmel_pit_ofdata_to_platdata(struct udevice *dev) |
| { |
| struct atmel_pit_platdata *plat = dev_get_platdata(dev); |
| |
| plat->regs = dev_read_addr_ptr(dev); |
| |
| return 0; |
| } |
| |
| static const struct timer_ops atmel_pit_ops = { |
| .get_count = atmel_pit_get_count, |
| }; |
| |
| static const struct udevice_id atmel_pit_ids[] = { |
| { .compatible = "atmel,at91sam9260-pit" }, |
| { } |
| }; |
| |
| U_BOOT_DRIVER(atmel_pit) = { |
| .name = "atmel_pit", |
| .id = UCLASS_TIMER, |
| .of_match = atmel_pit_ids, |
| .ofdata_to_platdata = atmel_pit_ofdata_to_platdata, |
| .plat_auto = sizeof(struct atmel_pit_platdata), |
| .probe = atmel_pit_probe, |
| .ops = &atmel_pit_ops, |
| }; |