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