From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:13:47 +0200 Subject: Adding upstream version 2.8.0+dfsg. Signed-off-by: Daniel Baumann --- drivers/imx/timer/imx_gpt.c | 62 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 drivers/imx/timer/imx_gpt.c (limited to 'drivers/imx/timer/imx_gpt.c') diff --git a/drivers/imx/timer/imx_gpt.c b/drivers/imx/timer/imx_gpt.c new file mode 100644 index 0000000..464efe9 --- /dev/null +++ b/drivers/imx/timer/imx_gpt.c @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include + +#include +#include + +#include + +#define GPTCR_SWR BIT(15) /* Software reset */ +#define GPTCR_24MEN BIT(10) /* Enable 24MHz clock input */ +#define GPTCR_CLKSOURCE_OSC (5 << 6) /* Clock source OSC */ +#define GPTCR_CLKSOURCE_MASK (0x7 << 6) +#define GPTCR_TEN 1 /* Timer enable */ + +#define GPTPR_PRESCL_24M_SHIFT 12 + +#define SYS_COUNTER_FREQ_IN_MHZ 3 + +#define GPTPR_TIMER_CTRL (imx_base_addr + 0x000) +#define GPTPR_TIMER_PRESCL (imx_base_addr + 0x004) +#define GPTPR_TIMER_CNTR (imx_base_addr + 0x024) + +static uintptr_t imx_base_addr; + +uint32_t imx_get_timer_value(void) +{ + return ~mmio_read_32(GPTPR_TIMER_CNTR); +} + +static const timer_ops_t imx_gpt_ops = { + .get_timer_value = imx_get_timer_value, + .clk_mult = 1, + .clk_div = SYS_COUNTER_FREQ_IN_MHZ, +}; + +void imx_gpt_ops_init(uintptr_t base_addr) +{ + int val; + + assert(base_addr != 0); + + imx_base_addr = base_addr; + + /* setup GP Timer */ + mmio_write_32(GPTPR_TIMER_CTRL, GPTCR_SWR); + mmio_write_32(GPTPR_TIMER_CTRL, 0); + + /* get 3MHz from 24MHz */ + mmio_write_32(GPTPR_TIMER_PRESCL, (7 << GPTPR_PRESCL_24M_SHIFT)); + + val = mmio_read_32(GPTPR_TIMER_CTRL); + val &= ~GPTCR_CLKSOURCE_MASK; + val |= GPTCR_24MEN | GPTCR_CLKSOURCE_OSC | GPTCR_TEN; + mmio_write_32(GPTPR_TIMER_CTRL, val); + + timer_init(&imx_gpt_ops); +} -- cgit v1.2.3