| Kuan Lim Lee | eb66fc3 | 2023-09-19 15:30:36 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright 2022 StarFive, Inc. All rights reserved. |
| 4 | * Author: Lee Kuan Lim <kuanlim.lee@starfivetech.com> |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <clk.h> |
| 9 | #include <dm.h> |
| 10 | #include <time.h> |
| 11 | #include <timer.h> |
| 12 | #include <asm/io.h> |
| 13 | #include <dm/device-internal.h> |
| 14 | #include <linux/err.h> |
| 15 | |
| 16 | #define STF_TIMER_INT_STATUS 0x00 |
| 17 | #define STF_TIMER_CTL 0x04 |
| 18 | #define STF_TIMER_LOAD 0x08 |
| 19 | #define STF_TIMER_ENABLE 0x10 |
| 20 | #define STF_TIMER_RELOAD 0x14 |
| 21 | #define STF_TIMER_VALUE 0x18 |
| 22 | #define STF_TIMER_INT_CLR 0x20 |
| 23 | #define STF_TIMER_INT_MASK 0x24 |
| 24 | |
| 25 | struct starfive_timer_priv { |
| 26 | void __iomem *base; |
| 27 | u32 timer_size; |
| 28 | }; |
| 29 | |
| 30 | static u64 notrace starfive_get_count(struct udevice *dev) |
| 31 | { |
| 32 | struct starfive_timer_priv *priv = dev_get_priv(dev); |
| 33 | |
| 34 | /* Read decrement timer value and convert to increment value */ |
| 35 | return priv->timer_size - readl(priv->base + STF_TIMER_VALUE); |
| 36 | } |
| 37 | |
| 38 | static const struct timer_ops starfive_ops = { |
| 39 | .get_count = starfive_get_count, |
| 40 | }; |
| 41 | |
| 42 | static int starfive_probe(struct udevice *dev) |
| 43 | { |
| 44 | struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| 45 | struct starfive_timer_priv *priv = dev_get_priv(dev); |
| 46 | int timer_channel; |
| 47 | struct clk clk; |
| 48 | int ret; |
| 49 | |
| 50 | priv->base = dev_read_addr_ptr(dev); |
| 51 | if (IS_ERR(priv->base)) |
| 52 | return PTR_ERR(priv->base); |
| 53 | |
| 54 | timer_channel = dev_read_u32_default(dev, "channel", 0); |
| 55 | priv->base = priv->base + (0x40 * timer_channel); |
| 56 | |
| 57 | /* Get clock rate from channel selectecd*/ |
| 58 | ret = clk_get_by_index(dev, timer_channel, &clk); |
| 59 | if (ret) |
| 60 | return ret; |
| 61 | |
| 62 | ret = clk_enable(&clk); |
| 63 | if (ret) |
| 64 | return ret; |
| 65 | uc_priv->clock_rate = clk_get_rate(&clk); |
| 66 | |
| 67 | /* Initiate timer, channel 0 */ |
| 68 | /* Unmask Interrupt Mask */ |
| 69 | writel(0, priv->base + STF_TIMER_INT_MASK); |
| 70 | /* Single run mode Setting */ |
| 71 | if (dev_read_bool(dev, "single-run")) |
| 72 | writel(1, priv->base + STF_TIMER_CTL); |
| 73 | /* Set Reload value */ |
| 74 | priv->timer_size = dev_read_u32_default(dev, "timer-size", 0xffffffff); |
| 75 | writel(priv->timer_size, priv->base + STF_TIMER_LOAD); |
| 76 | /* Enable to start timer */ |
| 77 | writel(1, priv->base + STF_TIMER_ENABLE); |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static const struct udevice_id starfive_ids[] = { |
| 83 | { .compatible = "starfive,jh8100-timers" }, |
| 84 | { } |
| 85 | }; |
| 86 | |
| 87 | U_BOOT_DRIVER(jh8100_starfive_timer) = { |
| 88 | .name = "jh8100_starfive_timer", |
| 89 | .id = UCLASS_TIMER, |
| 90 | .of_match = starfive_ids, |
| 91 | .probe = starfive_probe, |
| 92 | .ops = &starfive_ops, |
| 93 | .priv_auto = sizeof(struct starfive_timer_priv), |
| 94 | }; |