Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Designware APB Timer driver |
| 4 | * |
| 5 | * Copyright (C) 2018 Marek Vasut <marex@denx.de> |
| 6 | */ |
| 7 | |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 8 | #include <dm.h> |
| 9 | #include <clk.h> |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 10 | #include <dt-structs.h> |
Simon Glass | 9bc1564 | 2020-02-03 07:36:16 -0700 | [diff] [blame] | 11 | #include <malloc.h> |
Simon Goldschmidt | 0b6b82a | 2019-10-23 22:23:12 +0200 | [diff] [blame] | 12 | #include <reset.h> |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 13 | #include <timer.h> |
Simon Glass | 9bc1564 | 2020-02-03 07:36:16 -0700 | [diff] [blame] | 14 | #include <dm/device_compat.h> |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 15 | |
| 16 | #include <asm/io.h> |
| 17 | #include <asm/arch/timer.h> |
| 18 | |
| 19 | #define DW_APB_LOAD_VAL 0x0 |
| 20 | #define DW_APB_CURR_VAL 0x4 |
| 21 | #define DW_APB_CTRL 0x8 |
| 22 | |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 23 | struct dw_apb_timer_priv { |
Johan Jonker | 1642763 | 2023-03-13 01:29:47 +0100 | [diff] [blame] | 24 | uintptr_t regs; |
Simon Goldschmidt | 0b6b82a | 2019-10-23 22:23:12 +0200 | [diff] [blame] | 25 | struct reset_ctl_bulk resets; |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 26 | }; |
| 27 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 28 | struct dw_apb_timer_plat { |
| 29 | #if CONFIG_IS_ENABLED(OF_PLATDATA) |
| 30 | struct dtd_snps_dw_apb_timer dtplat; |
| 31 | #endif |
| 32 | }; |
| 33 | |
Sean Anderson | 947fc2d | 2020-10-07 14:37:44 -0400 | [diff] [blame] | 34 | static u64 dw_apb_timer_get_count(struct udevice *dev) |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 35 | { |
| 36 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 37 | |
| 38 | /* |
| 39 | * The DW APB counter counts down, but this function |
| 40 | * requires the count to be incrementing. Invert the |
| 41 | * result. |
| 42 | */ |
Sean Anderson | 947fc2d | 2020-10-07 14:37:44 -0400 | [diff] [blame] | 43 | return timer_conv_64(~readl(priv->regs + DW_APB_CURR_VAL)); |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | static int dw_apb_timer_probe(struct udevice *dev) |
| 47 | { |
| 48 | struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| 49 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 50 | struct clk clk; |
| 51 | int ret; |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 52 | #if CONFIG_IS_ENABLED(OF_PLATDATA) |
| 53 | struct dw_apb_timer_plat *plat = dev_get_plat(dev); |
| 54 | struct dtd_snps_dw_apb_timer *dtplat = &plat->dtplat; |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 55 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 56 | priv->regs = dtplat->reg[0]; |
Simon Goldschmidt | 0b6b82a | 2019-10-23 22:23:12 +0200 | [diff] [blame] | 57 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 58 | ret = clk_get_by_phandle(dev, &dtplat->clocks[0], &clk); |
| 59 | if (ret < 0) |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 60 | return ret; |
| 61 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 62 | uc_priv->clock_rate = dtplat->clock_frequency; |
| 63 | #endif |
| 64 | if (CONFIG_IS_ENABLED(OF_REAL)) { |
| 65 | ret = reset_get_bulk(dev, &priv->resets); |
| 66 | if (ret) |
| 67 | dev_warn(dev, "Can't get reset: %d\n", ret); |
| 68 | else |
| 69 | reset_deassert_bulk(&priv->resets); |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 70 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 71 | ret = clk_get_by_index(dev, 0, &clk); |
| 72 | if (ret) |
| 73 | return ret; |
| 74 | |
| 75 | uc_priv->clock_rate = clk_get_rate(&clk); |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 76 | } |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 77 | |
| 78 | /* init timer */ |
| 79 | writel(0xffffffff, priv->regs + DW_APB_LOAD_VAL); |
| 80 | writel(0xffffffff, priv->regs + DW_APB_CURR_VAL); |
| 81 | setbits_le32(priv->regs + DW_APB_CTRL, 0x3); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
Simon Glass | aad29ae | 2020-12-03 16:55:21 -0700 | [diff] [blame] | 86 | static int dw_apb_timer_of_to_plat(struct udevice *dev) |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 87 | { |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 88 | if (CONFIG_IS_ENABLED(OF_REAL)) { |
| 89 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 90 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 91 | priv->regs = dev_read_addr(dev); |
| 92 | } |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
Simon Goldschmidt | 0b6b82a | 2019-10-23 22:23:12 +0200 | [diff] [blame] | 97 | static int dw_apb_timer_remove(struct udevice *dev) |
| 98 | { |
| 99 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 100 | |
| 101 | return reset_release_bulk(&priv->resets); |
| 102 | } |
| 103 | |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 104 | static const struct timer_ops dw_apb_timer_ops = { |
| 105 | .get_count = dw_apb_timer_get_count, |
| 106 | }; |
| 107 | |
| 108 | static const struct udevice_id dw_apb_timer_ids[] = { |
| 109 | { .compatible = "snps,dw-apb-timer" }, |
| 110 | {} |
| 111 | }; |
| 112 | |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 113 | U_BOOT_DRIVER(snps_dw_apb_timer) = { |
| 114 | .name = "snps_dw_apb_timer", |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 115 | .id = UCLASS_TIMER, |
| 116 | .ops = &dw_apb_timer_ops, |
| 117 | .probe = dw_apb_timer_probe, |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 118 | .of_match = dw_apb_timer_ids, |
Johan Jonker | 32de1ee | 2022-04-09 18:55:07 +0200 | [diff] [blame] | 119 | .of_to_plat = dw_apb_timer_of_to_plat, |
Simon Goldschmidt | 0b6b82a | 2019-10-23 22:23:12 +0200 | [diff] [blame] | 120 | .remove = dw_apb_timer_remove, |
Simon Glass | 8a2b47f | 2020-12-03 16:55:17 -0700 | [diff] [blame] | 121 | .priv_auto = sizeof(struct dw_apb_timer_priv), |
Johan Jonker | 0387298 | 2022-04-09 18:55:06 +0200 | [diff] [blame] | 122 | .plat_auto = sizeof(struct dw_apb_timer_plat), |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 123 | }; |