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62 lines
1.4 KiB
62 lines
1.4 KiB
/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <drivers/delay_timer.h>
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#include <lib/mmio.h>
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#include <imx_gpt.h>
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#define GPTCR_SWR BIT(15) /* Software reset */
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#define GPTCR_24MEN BIT(10) /* Enable 24MHz clock input */
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#define GPTCR_CLKSOURCE_OSC (5 << 6) /* Clock source OSC */
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#define GPTCR_CLKSOURCE_MASK (0x7 << 6)
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#define GPTCR_TEN 1 /* Timer enable */
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#define GPTPR_PRESCL_24M_SHIFT 12
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#define SYS_COUNTER_FREQ_IN_MHZ 3
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#define GPTPR_TIMER_CTRL (imx_base_addr + 0x000)
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#define GPTPR_TIMER_PRESCL (imx_base_addr + 0x004)
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#define GPTPR_TIMER_CNTR (imx_base_addr + 0x024)
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static uintptr_t imx_base_addr;
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uint32_t imx_get_timer_value(void)
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{
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return ~mmio_read_32(GPTPR_TIMER_CNTR);
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}
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static const timer_ops_t imx_gpt_ops = {
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.get_timer_value = imx_get_timer_value,
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.clk_mult = 1,
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.clk_div = SYS_COUNTER_FREQ_IN_MHZ,
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};
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void imx_gpt_ops_init(uintptr_t base_addr)
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{
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int val;
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assert(base_addr != 0);
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imx_base_addr = base_addr;
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/* setup GP Timer */
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mmio_write_32(GPTPR_TIMER_CTRL, GPTCR_SWR);
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mmio_write_32(GPTPR_TIMER_CTRL, 0);
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/* get 3MHz from 24MHz */
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mmio_write_32(GPTPR_TIMER_PRESCL, (7 << GPTPR_PRESCL_24M_SHIFT));
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val = mmio_read_32(GPTPR_TIMER_CTRL);
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val &= ~GPTCR_CLKSOURCE_MASK;
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val |= GPTCR_24MEN | GPTCR_CLKSOURCE_OSC | GPTCR_TEN;
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mmio_write_32(GPTPR_TIMER_CTRL, val);
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timer_init(&imx_gpt_ops);
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}
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