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/*
* Copyright 2013 Google Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but without any warranty; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <arch/io.h>
#include <stdint.h>
#include <time.h>
#include "clk.h"
struct __attribute__((packed)) mct_regs
{
uint32_t mct_cfg;
uint8_t reserved0[0xfc];
uint32_t g_cnt_l;
uint32_t g_cnt_u;
uint8_t reserved1[0x8];
uint32_t g_cnt_wstat;
uint8_t reserved2[0xec];
uint32_t g_comp0_l;
uint32_t g_comp0_u;
uint32_t g_comp0_addr_incr;
uint8_t reserved3[0x4];
uint32_t g_comp1_l;
uint32_t g_comp1_u;
uint32_t g_comp1_addr_incr;
uint8_t reserved4[0x4];
uint32_t g_comp2_l;
uint32_t g_comp2_u;
uint32_t g_comp2_addr_incr;
uint8_t reserved5[0x4];
uint32_t g_comp3_l;
uint32_t g_comp3_u;
uint32_t g_comp3_addr_incr;
uint8_t reserved6[0x4];
uint32_t g_tcon;
uint32_t g_int_cstat;
uint32_t g_int_enb;
uint32_t g_wstat;
uint8_t reserved7[0xb0];
uint32_t l0_tcntb;
uint32_t l0_tcnto;
uint32_t l0_icntb;
uint32_t l0_icnto;
uint32_t l0_frcntb;
uint32_t l0_frcnto;
uint8_t reserved8[0x8];
uint32_t l0_tcon;
uint8_t reserved9[0xc];
uint32_t l0_int_cstat;
uint32_t l0_int_enb;
uint8_t reserved10[0x8];
uint32_t l0_wstat;
uint8_t reserved11[0xbc];
uint32_t l1_tcntb;
uint32_t l1_tcnto;
uint32_t l1_icntb;
uint32_t l1_icnto;
uint32_t l1_frcntb;
uint32_t l1_frcnto;
uint8_t reserved12[0x8];
uint32_t l1_tcon;
uint8_t reserved13[0xc];
uint32_t l1_int_cstat;
uint32_t l1_int_enb;
uint8_t reserved14[0x8];
uint32_t l1_wstat;
};
static int enabled = 0;
static struct mct_regs *const mct =
(struct mct_regs *)MCT_ADDRESS;
uint64_t mct_raw_value(void)
{
if (!enabled) {
writel(readl(&mct->g_tcon) | (0x1 << 8), &mct->g_tcon);
enabled = 1;
}
uint64_t upper = readl(&mct->g_cnt_u);
uint64_t lower = readl(&mct->g_cnt_l);
return (upper << 32) | lower;
}
void timer_start(void)
{
writel(readl(&mct->g_tcon) | (0x1 << 8), &mct->g_tcon);
enabled = 1;
}
u32 timer_us(void)
{
uint64_t raw = mct_raw_value();
static uint32_t ticks_per_microsecond = MCT_HZ/1000000;
uint32_t usec = raw / ticks_per_microsecond;
return usec;
}
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