diff options
Diffstat (limited to 'arch/mips/loongson64/loongson-3/hpet.c')
| -rw-r--r-- | arch/mips/loongson64/loongson-3/hpet.c | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/arch/mips/loongson64/loongson-3/hpet.c b/arch/mips/loongson64/loongson-3/hpet.c deleted file mode 100644 index ed15430ad64f..000000000000 --- a/arch/mips/loongson64/loongson-3/hpet.c +++ /dev/null @@ -1,289 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/init.h> -#include <linux/pci.h> -#include <linux/percpu.h> -#include <linux/delay.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> - -#include <asm/hpet.h> -#include <asm/time.h> - -#define SMBUS_CFG_BASE (loongson_sysconf.ht_control_base + 0x0300a000) -#define SMBUS_PCI_REG40 0x40 -#define SMBUS_PCI_REG64 0x64 -#define SMBUS_PCI_REGB4 0xb4 - -#define HPET_MIN_CYCLES 16 -#define HPET_MIN_PROG_DELTA (HPET_MIN_CYCLES * 12) - -static DEFINE_SPINLOCK(hpet_lock); -DEFINE_PER_CPU(struct clock_event_device, hpet_clockevent_device); - -static unsigned int smbus_read(int offset) -{ - return *(volatile unsigned int *)(SMBUS_CFG_BASE + offset); -} - -static void smbus_write(int offset, int data) -{ - *(volatile unsigned int *)(SMBUS_CFG_BASE + offset) = data; -} - -static void smbus_enable(int offset, int bit) -{ - unsigned int cfg = smbus_read(offset); - - cfg |= bit; - smbus_write(offset, cfg); -} - -static int hpet_read(int offset) -{ - return *(volatile unsigned int *)(HPET_MMIO_ADDR + offset); -} - -static void hpet_write(int offset, int data) -{ - *(volatile unsigned int *)(HPET_MMIO_ADDR + offset) = data; -} - -static void hpet_start_counter(void) -{ - unsigned int cfg = hpet_read(HPET_CFG); - - cfg |= HPET_CFG_ENABLE; - hpet_write(HPET_CFG, cfg); -} - -static void hpet_stop_counter(void) -{ - unsigned int cfg = hpet_read(HPET_CFG); - - cfg &= ~HPET_CFG_ENABLE; - hpet_write(HPET_CFG, cfg); -} - -static void hpet_reset_counter(void) -{ - hpet_write(HPET_COUNTER, 0); - hpet_write(HPET_COUNTER + 4, 0); -} - -static void hpet_restart_counter(void) -{ - hpet_stop_counter(); - hpet_reset_counter(); - hpet_start_counter(); -} - -static void hpet_enable_legacy_int(void) -{ - /* Do nothing on Loongson-3 */ -} - -static int hpet_set_state_periodic(struct clock_event_device *evt) -{ - int cfg; - - spin_lock(&hpet_lock); - - pr_info("set clock event to periodic mode!\n"); - /* stop counter */ - hpet_stop_counter(); - - /* enables the timer0 to generate a periodic interrupt */ - cfg = hpet_read(HPET_T0_CFG); - cfg &= ~HPET_TN_LEVEL; - cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | HPET_TN_SETVAL | - HPET_TN_32BIT; - hpet_write(HPET_T0_CFG, cfg); - - /* set the comparator */ - hpet_write(HPET_T0_CMP, HPET_COMPARE_VAL); - udelay(1); - hpet_write(HPET_T0_CMP, HPET_COMPARE_VAL); - - /* start counter */ - hpet_start_counter(); - - spin_unlock(&hpet_lock); - return 0; -} - -static int hpet_set_state_shutdown(struct clock_event_device *evt) -{ - int cfg; - - spin_lock(&hpet_lock); - - cfg = hpet_read(HPET_T0_CFG); - cfg &= ~HPET_TN_ENABLE; - hpet_write(HPET_T0_CFG, cfg); - - spin_unlock(&hpet_lock); - return 0; -} - -static int hpet_set_state_oneshot(struct clock_event_device *evt) -{ - int cfg; - - spin_lock(&hpet_lock); - - pr_info("set clock event to one shot mode!\n"); - cfg = hpet_read(HPET_T0_CFG); - /* - * set timer0 type - * 1 : periodic interrupt - * 0 : non-periodic(oneshot) interrupt - */ - cfg &= ~HPET_TN_PERIODIC; - cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; - hpet_write(HPET_T0_CFG, cfg); - - spin_unlock(&hpet_lock); - return 0; -} - -static int hpet_tick_resume(struct clock_event_device *evt) -{ - spin_lock(&hpet_lock); - hpet_enable_legacy_int(); - spin_unlock(&hpet_lock); - - return 0; -} - -static int hpet_next_event(unsigned long delta, - struct clock_event_device *evt) -{ - u32 cnt; - s32 res; - - cnt = hpet_read(HPET_COUNTER); - cnt += (u32) delta; - hpet_write(HPET_T0_CMP, cnt); - - res = (s32)(cnt - hpet_read(HPET_COUNTER)); - - return res < HPET_MIN_CYCLES ? -ETIME : 0; -} - -static irqreturn_t hpet_irq_handler(int irq, void *data) -{ - int is_irq; - struct clock_event_device *cd; - unsigned int cpu = smp_processor_id(); - - is_irq = hpet_read(HPET_STATUS); - if (is_irq & HPET_T0_IRS) { - /* clear the TIMER0 irq status register */ - hpet_write(HPET_STATUS, HPET_T0_IRS); - cd = &per_cpu(hpet_clockevent_device, cpu); - cd->event_handler(cd); - return IRQ_HANDLED; - } - return IRQ_NONE; -} - -static struct irqaction hpet_irq = { - .handler = hpet_irq_handler, - .flags = IRQF_NOBALANCING | IRQF_TIMER, - .name = "hpet", -}; - -/* - * hpet address assignation and irq setting should be done in bios. - * but pmon don't do this, we just setup here directly. - * The operation under is normal. unfortunately, hpet_setup process - * is before pci initialize. - * - * { - * struct pci_dev *pdev; - * - * pdev = pci_get_device(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, NULL); - * pci_write_config_word(pdev, SMBUS_PCI_REGB4, HPET_ADDR); - * - * ... - * } - */ -static void hpet_setup(void) -{ - /* set hpet base address */ - smbus_write(SMBUS_PCI_REGB4, HPET_ADDR); - - /* enable decoding of access to HPET MMIO*/ - smbus_enable(SMBUS_PCI_REG40, (1 << 28)); - - /* HPET irq enable */ - smbus_enable(SMBUS_PCI_REG64, (1 << 10)); - - hpet_enable_legacy_int(); -} - -void __init setup_hpet_timer(void) -{ - unsigned int cpu = smp_processor_id(); - struct clock_event_device *cd; - - hpet_setup(); - - cd = &per_cpu(hpet_clockevent_device, cpu); - cd->name = "hpet"; - cd->rating = 100; - cd->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - cd->set_state_shutdown = hpet_set_state_shutdown; - cd->set_state_periodic = hpet_set_state_periodic; - cd->set_state_oneshot = hpet_set_state_oneshot; - cd->tick_resume = hpet_tick_resume; - cd->set_next_event = hpet_next_event; - cd->irq = HPET_T0_IRQ; - cd->cpumask = cpumask_of(cpu); - clockevent_set_clock(cd, HPET_FREQ); - cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd); - cd->max_delta_ticks = 0x7fffffff; - cd->min_delta_ns = clockevent_delta2ns(HPET_MIN_PROG_DELTA, cd); - cd->min_delta_ticks = HPET_MIN_PROG_DELTA; - - clockevents_register_device(cd); - setup_irq(HPET_T0_IRQ, &hpet_irq); - pr_info("hpet clock event device register\n"); -} - -static u64 hpet_read_counter(struct clocksource *cs) -{ - return (u64)hpet_read(HPET_COUNTER); -} - -static void hpet_suspend(struct clocksource *cs) -{ -} - -static void hpet_resume(struct clocksource *cs) -{ - hpet_setup(); - hpet_restart_counter(); -} - -static struct clocksource csrc_hpet = { - .name = "hpet", - /* mips clocksource rating is less than 300, so hpet is better. */ - .rating = 300, - .read = hpet_read_counter, - .mask = CLOCKSOURCE_MASK(32), - /* oneshot mode work normal with this flag */ - .flags = CLOCK_SOURCE_IS_CONTINUOUS, - .suspend = hpet_suspend, - .resume = hpet_resume, - .mult = 0, - .shift = 10, -}; - -int __init init_hpet_clocksource(void) -{ - csrc_hpet.mult = clocksource_hz2mult(HPET_FREQ, csrc_hpet.shift); - return clocksource_register_hz(&csrc_hpet, HPET_FREQ); -} - -arch_initcall(init_hpet_clocksource); |