Skip to content
Snippets Groups Projects
rockchip_timer.c 4.22 KiB
Newer Older
  • Learn to ignore specific revisions
  • /*
     * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
     *
     * SPDX-License-Identifier: GPL-2.0+
     */
    
    #include <common.h>
    #include <dm.h>
    
    #include <dm/ofnode.h>
    
    #include <mapmem.h>
    #include <asm/arch/timer.h>
    #include <dt-structs.h>
    #include <timer.h>
    #include <asm/io.h>
    
    DECLARE_GLOBAL_DATA_PTR;
    
    #if CONFIG_IS_ENABLED(OF_PLATDATA)
    struct rockchip_timer_plat {
    	struct dtd_rockchip_rk3368_timer dtd;
    };
    #endif
    
    /* Driver private data. Contains timer id. Could be either 0 or 1. */
    struct rockchip_timer_priv {
    	struct rk_timer *timer;
    };
    
    
    static inline int64_t rockchip_timer_get_curr_value(struct rk_timer *timer)
    
    {
    	uint64_t timebase_h, timebase_l;
    	uint64_t cntr;
    
    
    	timebase_l = readl(&timer->timer_curr_value0);
    	timebase_h = readl(&timer->timer_curr_value1);
    
    	return cntr;
    }
    
    #if CONFIG_IS_ENABLED(BOOTSTAGE)
    ulong timer_get_boot_us(void)
    {
    	uint64_t  ticks = 0;
    	uint32_t  rate;
    	uint64_t  us;
    	int ret;
    
    	ret = dm_timer_init();
    
    	if (!ret) {
    		/* The timer is available */
    		rate = timer_get_rate(gd->timer);
    		timer_get_count(gd->timer, &ticks);
    #if !CONFIG_IS_ENABLED(OF_PLATDATA)
    	} else if (ret == -EAGAIN) {
    		/* We have been called so early that the DM is not ready,... */
    		ofnode node = offset_to_ofnode(-1);
    		struct rk_timer *timer = NULL;
    
    		/*
    		 * ... so we try to access the raw timer, if it is specified
    		 * via the tick-timer property in /chosen.
    		 */
    		node = ofnode_get_chosen_node("tick-timer");
    		if (!ofnode_valid(node)) {
    			debug("%s: no /chosen/tick-timer\n", __func__);
    			return 0;
    		}
    
    		timer = (struct rk_timer *)ofnode_get_addr(node);
    
    		/* This timer is down-counting */
    		ticks = ~0uLL - rockchip_timer_get_curr_value(timer);
    		if (ofnode_read_u32(node, "clock-frequency", &rate)) {
    			debug("%s: could not read clock-frequency\n", __func__);
    			return 0;
    		}
    #endif
    	} else {
    		return 0;
    	}
    
    	us = (ticks * 1000) / rate;
    	return us;
    }
    #endif
    
    static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
    {
    	struct rockchip_timer_priv *priv = dev_get_priv(dev);
    	uint64_t cntr = rockchip_timer_get_curr_value(priv->timer);
    
    	/* timers are down-counting */
    
    	*count = ~0ull - cntr;
    	return 0;
    }
    
    static int rockchip_clk_ofdata_to_platdata(struct udevice *dev)
    {
    #if !CONFIG_IS_ENABLED(OF_PLATDATA)
    	struct rockchip_timer_priv *priv = dev_get_priv(dev);
    
    	priv->timer = (struct rk_timer *)devfdt_get_addr(dev);
    #endif
    
    	return 0;
    }
    
    static int rockchip_timer_start(struct udevice *dev)
    {
    	struct rockchip_timer_priv *priv = dev_get_priv(dev);
    	const uint64_t reload_val = ~0uLL;
    	const uint32_t reload_val_l = reload_val & 0xffffffff;
    	const uint32_t reload_val_h = reload_val >> 32;
    
    
    	/* don't reinit, if the timer is already running and set up */
    	if ((readl(&priv->timer->timer_ctrl_reg) & 1) == 1 &&
    	    (readl(&priv->timer->timer_load_count0) == reload_val_l) &&
    	    (readl(&priv->timer->timer_load_count1) == reload_val_h))
    		return 0;
    
    
    	/* disable timer and reset all control */
    	writel(0, &priv->timer->timer_ctrl_reg);
    	/* write reload value */
    	writel(reload_val_l, &priv->timer->timer_load_count0);
    	writel(reload_val_h, &priv->timer->timer_load_count1);
    	/* enable timer */
    	writel(1, &priv->timer->timer_ctrl_reg);
    
    	return 0;
    }
    
    static int rockchip_timer_probe(struct udevice *dev)
    {
    #if CONFIG_IS_ENABLED(OF_PLATDATA)
    	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
    	struct rockchip_timer_priv *priv = dev_get_priv(dev);
    	struct rockchip_timer_plat *plat = dev_get_platdata(dev);
    
    	priv->timer = map_sysmem(plat->dtd.reg[1], plat->dtd.reg[3]);
    	uc_priv->clock_rate = plat->dtd.clock_frequency;
    #endif
    
    	return rockchip_timer_start(dev);
    }
    
    static const struct timer_ops rockchip_timer_ops = {
    	.get_count = rockchip_timer_get_count,
    };
    
    static const struct udevice_id rockchip_timer_ids[] = {
    	{ .compatible = "rockchip,rk3368-timer" },
    	{}
    };
    
    
    U_BOOT_DRIVER(rockchip_rk3368_timer) = {
    
    	.name	= "rockchip_rk3368_timer",
    	.id	= UCLASS_TIMER,
    	.of_match = rockchip_timer_ids,
    	.probe = rockchip_timer_probe,
    	.ops	= &rockchip_timer_ops,
    	.flags = DM_FLAG_PRE_RELOC,
    	.priv_auto_alloc_size = sizeof(struct rockchip_timer_priv),
    #if CONFIG_IS_ENABLED(OF_PLATDATA)
    	.platdata_auto_alloc_size = sizeof(struct rockchip_timer_plat),
    #endif
    	.ofdata_to_platdata = rockchip_clk_ofdata_to_platdata,
    };