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https://github.com/AsahiLinux/u-boot
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65cc0e2a65
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014, STMicroelectronics - All Rights Reserved
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* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
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*/
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#include <common.h>
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#include <init.h>
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#include <time.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include <asm/arch-stv0991/hardware.h>
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#include <asm/arch-stv0991/stv0991_cgu.h>
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#include <asm/arch-stv0991/stv0991_gpt.h>
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#include <linux/delay.h>
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static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
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(struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
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#define READ_TIMER() (readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING)
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#define GPT_RESOLUTION (CFG_SYS_HZ_CLOCK / CONFIG_SYS_HZ)
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DECLARE_GLOBAL_DATA_PTR;
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#define timestamp gd->arch.tbl
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#define lastdec gd->arch.lastinc
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static ulong get_timer_masked(void);
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int timer_init(void)
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{
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/* Timer1 clock configuration */
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writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);
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writel(readl(&stv0991_cgu_regs->cgu_enable_2) |
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TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);
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/* Stop the timer */
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writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
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writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);
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/* Configure timer for auto-reload */
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writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,
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&gpt1_regs_ptr->cr1);
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/* load value for free running */
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writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);
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/* start timer */
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writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,
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&gpt1_regs_ptr->cr1);
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/* Reset the timer */
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lastdec = READ_TIMER();
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timestamp = 0;
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return 0;
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}
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/*
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* timer without interrupts
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*/
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ulong get_timer(ulong base)
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{
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return (get_timer_masked() / GPT_RESOLUTION) - base;
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}
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void __udelay(unsigned long usec)
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{
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ulong tmo;
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ulong start = get_timer_masked();
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ulong tenudelcnt = CFG_SYS_HZ_CLOCK / (1000 * 100);
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ulong rndoff;
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rndoff = (usec % 10) ? 1 : 0;
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/* tenudelcnt timer tick gives 10 microsecconds delay */
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tmo = ((usec / 10) + rndoff) * tenudelcnt;
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while ((ulong) (get_timer_masked() - start) < tmo)
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;
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}
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static ulong get_timer_masked(void)
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{
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ulong now = READ_TIMER();
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if (now >= lastdec) {
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/* normal mode */
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timestamp += now - lastdec;
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} else {
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/* we have an overflow ... */
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timestamp += now + GPT_FREE_RUNNING - lastdec;
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}
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lastdec = now;
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return timestamp;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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