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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <os/mmio.h>
#include <os/trace.h>
#include <kern/panic.h>
#include <lib/stdbool.h>
#include <vm/vm.h>
#include <acpi/acpi.h>
#include <acpi/tables.h>
#include <dev/clkdev/hpet.h>
#define dtrace(fmt, ...) trace("hpet: " fmt, ##__VA_ARGS__)
/* HPET register offsets */
#define HPET_GCAP_ID 0x00 /* Global capabilities and ID */
#define HPET_GCONF 0x10 /* General configuration register */
#define HPET_COUNTER0 0xF0 /* Main counter register */
#define CAP_REV_ID(caps) (caps & 0xFF)
#define CAP_NUM_TIM(caps) (caps >> 8) & 0x1F
#define CAP_CLK_PERIOD(caps) (caps >> 32)
static volatile uint64_t *hpet_base;
static bool hpet_enabled = false;
/*
* Read a 64-bit unsigned value from an HPET
* register
*/
static inline uint64_t
hpet_readq(uint16_t reg)
{
uint64_t *base;
base = PTR_OFFSET(hpet_base, reg);
return mmio_read64(base);
}
/*
* Write a 64-bit unsigned value to an HPET
* register
*/
static inline void
hpet_writeq(uint16_t reg, uint64_t val)
{
uint64_t *base;
base = PTR_OFFSET(hpet_base, reg);
mmio_write32(base, val);
}
static void
hpet_sleep(uint64_t n, uint64_t units)
{
uint64_t period, caps;
uint64_t counter;
uint64_t ticks;
if (!hpet_enabled) {
return;
}
caps = hpet_readq(HPET_GCAP_ID);
period = CAP_CLK_PERIOD(caps);
counter = hpet_readq(HPET_COUNTER0);
ticks = counter + (n * (units / period));
while (hpet_readq(HPET_COUNTER0) < ticks);
}
void
hpet_msleep(size_t ms)
{
hpet_sleep(ms, 1000000000000);
}
int
hpet_init(void)
{
struct acpi_hpet *hpet;
struct acpi_gas *gas;
uint64_t gcap, gconf, counter;
uint32_t clk_period;
uint8_t rev_id;
uint8_t num_timer;
hpet = acpi_query("HPET");
if (hpet == NULL) {
return -ENODEV;
}
gas = &hpet->gas;
hpet_base = PHYS_TO_VIRT(gas->address);
gcap = hpet_readq(HPET_GCAP_ID);
/* Verify its values */
clk_period = CAP_CLK_PERIOD(gcap);
num_timer = CAP_NUM_TIM(gcap);
rev_id = gcap & 0xFF;
if (rev_id == 0) {
dtrace("bad hpet revision, cannot be zero\n");
panic("hpet: system self test failure\n");
}
/* Verify the clock period */
if (clk_period == 0 || clk_period > 0x05F5E100) {
dtrace("bad hpet clock period\n");
panic("hpet: system self test failure\n");
}
dtrace("rev=%d, num_timer=%d\n", rev_id, num_timer);
dtrace("clk_period=%d\n", clk_period);
hpet_writeq(HPET_COUNTER0, 0); /* Clear the counter */
hpet_writeq(HPET_GCONF, 1); /* Enable timer */
hpet_enabled = true;
dtrace("OK\n");
return 0;
}
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