| /* |
| * (C) Copyright 2007 |
| * Sascha Hauer, Pengutronix |
| * |
| * (C) Copyright 2009 Freescale Semiconductor, 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 <common.h> |
| #include <asm/io.h> |
| #include <asm/arch/imx-regs.h> |
| |
| /* General purpose timers registers */ |
| struct mxc_gpt { |
| unsigned int control; |
| unsigned int prescaler; |
| unsigned int status; |
| unsigned int nouse[6]; |
| unsigned int counter; |
| }; |
| |
| static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR; |
| |
| /* General purpose timers bitfields */ |
| #define GPTCR_SWR (1<<15) /* Software reset */ |
| #define GPTCR_FRR (1<<9) /* Freerun / restart */ |
| #define GPTCR_CLKSOURCE_32 (4<<6) /* Clock source */ |
| #define GPTCR_TEN (1) /* Timer enable */ |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| #define timestamp (gd->tbl) |
| #define lastinc (gd->lastinc) |
| |
| int timer_init(void) |
| { |
| int i; |
| ulong val; |
| |
| /* setup GP Timer 1 */ |
| __raw_writel(GPTCR_SWR, &cur_gpt->control); |
| |
| /* We have no udelay by now */ |
| for (i = 0; i < 100; i++) |
| __raw_writel(0, &cur_gpt->control); |
| |
| __raw_writel(0, &cur_gpt->prescaler); /* 32Khz */ |
| |
| /* Freerun Mode, PERCLK1 input */ |
| i = __raw_readl(&cur_gpt->control); |
| __raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control); |
| |
| val = __raw_readl(&cur_gpt->counter); |
| lastinc = val / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ); |
| timestamp = 0; |
| |
| return 0; |
| } |
| |
| ulong get_timer_masked(void) |
| { |
| ulong val = __raw_readl(&cur_gpt->counter); |
| val /= (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ); |
| if (val >= lastinc) |
| timestamp += (val - lastinc); |
| else |
| timestamp += ((0xFFFFFFFF / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ)) |
| - lastinc) + val; |
| lastinc = val; |
| return timestamp; |
| } |
| |
| ulong get_timer(ulong base) |
| { |
| return get_timer_masked() - base; |
| } |
| |
| /* delay x useconds AND preserve advance timestamp value */ |
| void __udelay(unsigned long usec) |
| { |
| unsigned long now, start, tmo; |
| tmo = usec * (CONFIG_SYS_MX5_CLK32 / 1000) / 1000; |
| |
| if (!tmo) |
| tmo = 1; |
| |
| now = start = readl(&cur_gpt->counter); |
| |
| while ((now - start) < tmo) |
| now = readl(&cur_gpt->counter); |
| |
| } |