kernel/amd64: hpet: HPET is architecture specific

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 0 insertions, 193 deletions

diff --git a/sys/dev/timer/hpet.c b/sys/dev/timer/hpet.c
deleted file mode 100644
index b836205..0000000
--- a/sys/dev/timer/hpet.c
+++ /dev/null
@@ -1,193 +0,0 @@
-/*
- * Copyright (c) 2023-2024 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 <dev/timer/hpet.h>
-#include <firmware/acpi/acpi.h>
-#include <sys/panic.h>
-#include <sys/cdefs.h>
-#include <sys/timer.h>
-#include <sys/errno.h>
-#include <sys/syslog.h>
-#include <sys/mmio.h>
-
-__MODULE_NAME("hpet");
-__KERNEL_META("$Hyra$: hpet.c, Ian Marco Moffett, "
-              "HPET driver");
-
-#define HPET_REG_CAPS               0x00
-#define HPET_GENERAL_CONFIG         0x10
-#define HPET_REG_MAIN_COUNTER       0xF0
-
-#define CAP_REV_ID(caps)            __SHIFTOUT(caps, 0xFF)
-#define CAP_NUM_TIM(caps)           __SHIFTOUT(caps, 0x1F << 8)
-#define CAP_COUNT_SIZE(caps)        __SHIFTOUT(caps, __BIT(13))
-#define CAP_VENDOR_ID(caps)         __SHIFTOUT(caps, 0xFFFF << 16)
-#define CAP_CLK_PERIOD(caps)        (caps >> 32)
-
-/*
- * TODO: Use some sort of helper function that
- *       uses PAUSE or some similar instruction
- *       for the current architecture. It is
- *       *not* a good idea to spin for a prolonged
- *       amount of time without it. For now we'll
- *       just use PAUSE on x86_64 like this.
- */
-#if defined(__x86_64__)
-#define spinwait_hint()   __ASMV("pause")
-#else
-#define spinwait_hint()   __nothing
-#endif  /* defined(__x86_64__) */
-
-static struct timer timer = { 0 };
-static struct hpet *acpi_hpet = NULL;
-static void *hpet_base = NULL;
-static bool is_faulty = false;
-
-/*
- * Read from HPET register space.
- *
- * @reg: Register to read from.
- */
-static inline uint64_t
-hpet_read(uint32_t reg)
-{
-    void *addr;
-
-    addr = (void *)((uintptr_t)hpet_base + reg);
-    return mmio_read64(addr);
-}
-
-/*
- * Write to HPET register space.
- *
- * @reg: Register to write to.
- * @val: Value to write.
- */
-static inline void
-hpet_write(uint32_t reg, uint64_t val)
-{
-    void *addr;
-
-    addr = (void *)((uintptr_t)hpet_base + reg);
-    mmio_write64(addr, val);
-}
-
-static int
-hpet_sleep(uint64_t n, uint64_t units)
-{
-    uint64_t caps;
-    uint32_t period;
-    uint64_t counter_val;
-    volatile size_t ticks;
-
-    /* Don't even try if faulty, would probably cause deadlock */
-    if (is_faulty) {
-        return EXIT_FAILURE;
-    }
-
-    caps = hpet_read(HPET_REG_CAPS);
-    period = CAP_CLK_PERIOD(caps);
-    counter_val = hpet_read(HPET_REG_MAIN_COUNTER);
-
-    ticks = counter_val + (n * (units / period));
-
-    while (hpet_read(HPET_REG_MAIN_COUNTER) < ticks) {
-        spinwait_hint();
-    }
-
-    return EXIT_SUCCESS;
-}
-
-int
-hpet_msleep(size_t ms)
-{
-    return hpet_sleep(ms, 1000000000000);
-}
-
-int
-hpet_usleep(size_t us)
-{
-    return hpet_sleep(us, 1000000000);
-}
-
-int
-hpet_nsleep(size_t ns)
-{
-    return hpet_sleep(ns, 1000000);
-}
-
-int
-hpet_init(void)
-{
-    struct acpi_gas *gas;
-    uint64_t caps;
-
-    acpi_hpet = acpi_query("HPET");
-    if (acpi_hpet == NULL)
-        return 1;       /* Not found */
-
-    gas = &acpi_hpet->gas;
-    hpet_base = (void *)gas->address;
-    caps = hpet_read(HPET_REG_CAPS);
-
-    /* Ensure caps aren't bogus */
-    if (CAP_REV_ID(caps) == 0) {
-        KERR("Found bogus revision, assuming faulty\n");
-        is_faulty = true;
-        return 1;
-    }
-    if (CAP_CLK_PERIOD(caps) > 0x05F5E100) {
-        /*
-         * The spec states this counter clk period
-         * must be <= 0x05F5E100. So we'll consider it
-         * as bogus if it exceeds this value
-         */
-        KERR("Found bogus COUNTER_CLK_PERIOD, assuming faulty\n");
-        KINFO("HPET REV - 0x%x\n", CAP_REV_ID(caps));
-        KINFO("COUNTER_CLK_PERIOD - 0x%x\n", CAP_CLK_PERIOD(caps));
-        is_faulty = true;
-        return 1;
-    }
-
-    KINFO("HPET integrity verified\n");
-
-    hpet_write(HPET_REG_MAIN_COUNTER, 0);
-    hpet_write(HPET_GENERAL_CONFIG, 1);
-
-    /* Setup the timer descriptor */
-    timer.name = "HIGH_PRECISION_EVENT_TIMER";
-    timer.msleep = hpet_msleep;
-    timer.usleep = hpet_usleep;
-    timer.nsleep = hpet_nsleep;
-    register_timer(TIMER_GP, &timer);
-
-    /* Not faulty */
-    is_faulty = false;
-    return 0;
-}