| Philipp Tomsich | 1168d2d | 2017-07-28 17:43:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0+ |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <dm.h> |
| 9 | #include <mapmem.h> |
| 10 | #include <asm/arch/timer.h> |
| 11 | #include <dt-structs.h> |
| 12 | #include <timer.h> |
| 13 | #include <asm/io.h> |
| 14 | |
| 15 | DECLARE_GLOBAL_DATA_PTR; |
| 16 | |
| 17 | #if CONFIG_IS_ENABLED(OF_PLATDATA) |
| 18 | struct rockchip_timer_plat { |
| 19 | struct dtd_rockchip_rk3368_timer dtd; |
| 20 | }; |
| 21 | #endif |
| 22 | |
| 23 | /* Driver private data. Contains timer id. Could be either 0 or 1. */ |
| 24 | struct rockchip_timer_priv { |
| 25 | struct rk_timer *timer; |
| 26 | }; |
| 27 | |
| 28 | static int rockchip_timer_get_count(struct udevice *dev, u64 *count) |
| 29 | { |
| 30 | struct rockchip_timer_priv *priv = dev_get_priv(dev); |
| 31 | uint64_t timebase_h, timebase_l; |
| 32 | uint64_t cntr; |
| 33 | |
| 34 | timebase_l = readl(&priv->timer->timer_curr_value0); |
| 35 | timebase_h = readl(&priv->timer->timer_curr_value1); |
| 36 | |
| 37 | /* timers are down-counting */ |
| 38 | cntr = timebase_h << 32 | timebase_l; |
| 39 | *count = ~0ull - cntr; |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | static int rockchip_clk_ofdata_to_platdata(struct udevice *dev) |
| 44 | { |
| 45 | #if !CONFIG_IS_ENABLED(OF_PLATDATA) |
| 46 | struct rockchip_timer_priv *priv = dev_get_priv(dev); |
| 47 | |
| 48 | priv->timer = (struct rk_timer *)devfdt_get_addr(dev); |
| 49 | #endif |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int rockchip_timer_start(struct udevice *dev) |
| 55 | { |
| 56 | struct rockchip_timer_priv *priv = dev_get_priv(dev); |
| 57 | const uint64_t reload_val = ~0uLL; |
| 58 | const uint32_t reload_val_l = reload_val & 0xffffffff; |
| 59 | const uint32_t reload_val_h = reload_val >> 32; |
| 60 | |
| 61 | /* disable timer and reset all control */ |
| 62 | writel(0, &priv->timer->timer_ctrl_reg); |
| 63 | /* write reload value */ |
| 64 | writel(reload_val_l, &priv->timer->timer_load_count0); |
| 65 | writel(reload_val_h, &priv->timer->timer_load_count1); |
| 66 | /* enable timer */ |
| 67 | writel(1, &priv->timer->timer_ctrl_reg); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static int rockchip_timer_probe(struct udevice *dev) |
| 73 | { |
| 74 | #if CONFIG_IS_ENABLED(OF_PLATDATA) |
| 75 | struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| 76 | struct rockchip_timer_priv *priv = dev_get_priv(dev); |
| 77 | struct rockchip_timer_plat *plat = dev_get_platdata(dev); |
| 78 | |
| 79 | priv->timer = map_sysmem(plat->dtd.reg[1], plat->dtd.reg[3]); |
| 80 | uc_priv->clock_rate = plat->dtd.clock_frequency; |
| 81 | #endif |
| 82 | |
| 83 | return rockchip_timer_start(dev); |
| 84 | } |
| 85 | |
| 86 | static const struct timer_ops rockchip_timer_ops = { |
| 87 | .get_count = rockchip_timer_get_count, |
| 88 | }; |
| 89 | |
| 90 | static const struct udevice_id rockchip_timer_ids[] = { |
| 91 | { .compatible = "rockchip,rk3368-timer" }, |
| 92 | {} |
| 93 | }; |
| 94 | |
| 95 | U_BOOT_DRIVER(arc_timer) = { |
| 96 | .name = "rockchip_rk3368_timer", |
| 97 | .id = UCLASS_TIMER, |
| 98 | .of_match = rockchip_timer_ids, |
| 99 | .probe = rockchip_timer_probe, |
| 100 | .ops = &rockchip_timer_ops, |
| 101 | .flags = DM_FLAG_PRE_RELOC, |
| 102 | .priv_auto_alloc_size = sizeof(struct rockchip_timer_priv), |
| 103 | #if CONFIG_IS_ENABLED(OF_PLATDATA) |
| 104 | .platdata_auto_alloc_size = sizeof(struct rockchip_timer_plat), |
| 105 | #endif |
| 106 | .ofdata_to_platdata = rockchip_clk_ofdata_to_platdata, |
| 107 | }; |