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 | |
| 8 | #include <common.h> |
| 9 | #include <dm.h> |
| 10 | #include <clk.h> |
| 11 | #include <timer.h> |
| 12 | |
| 13 | #include <asm/io.h> |
| 14 | #include <asm/arch/timer.h> |
| 15 | |
| 16 | #define DW_APB_LOAD_VAL 0x0 |
| 17 | #define DW_APB_CURR_VAL 0x4 |
| 18 | #define DW_APB_CTRL 0x8 |
| 19 | |
| 20 | DECLARE_GLOBAL_DATA_PTR; |
| 21 | |
| 22 | struct dw_apb_timer_priv { |
| 23 | fdt_addr_t regs; |
| 24 | }; |
| 25 | |
| 26 | static int dw_apb_timer_get_count(struct udevice *dev, u64 *count) |
| 27 | { |
| 28 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 29 | |
| 30 | /* |
| 31 | * The DW APB counter counts down, but this function |
| 32 | * requires the count to be incrementing. Invert the |
| 33 | * result. |
| 34 | */ |
| 35 | *count = ~readl(priv->regs + DW_APB_CURR_VAL); |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static int dw_apb_timer_probe(struct udevice *dev) |
| 41 | { |
| 42 | struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| 43 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 44 | struct clk clk; |
| 45 | int ret; |
| 46 | |
| 47 | ret = clk_get_by_index(dev, 0, &clk); |
| 48 | if (ret) |
| 49 | return ret; |
| 50 | |
| 51 | uc_priv->clock_rate = clk_get_rate(&clk); |
| 52 | |
| 53 | clk_free(&clk); |
| 54 | |
| 55 | /* init timer */ |
| 56 | writel(0xffffffff, priv->regs + DW_APB_LOAD_VAL); |
| 57 | writel(0xffffffff, priv->regs + DW_APB_CURR_VAL); |
| 58 | setbits_le32(priv->regs + DW_APB_CTRL, 0x3); |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int dw_apb_timer_ofdata_to_platdata(struct udevice *dev) |
| 64 | { |
| 65 | struct dw_apb_timer_priv *priv = dev_get_priv(dev); |
| 66 | |
| 67 | priv->regs = dev_read_addr(dev); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static const struct timer_ops dw_apb_timer_ops = { |
| 73 | .get_count = dw_apb_timer_get_count, |
| 74 | }; |
| 75 | |
| 76 | static const struct udevice_id dw_apb_timer_ids[] = { |
| 77 | { .compatible = "snps,dw-apb-timer" }, |
| 78 | {} |
| 79 | }; |
| 80 | |
| 81 | U_BOOT_DRIVER(dw_apb_timer) = { |
| 82 | .name = "dw_apb_timer", |
| 83 | .id = UCLASS_TIMER, |
| 84 | .ops = &dw_apb_timer_ops, |
| 85 | .probe = dw_apb_timer_probe, |
Marek Vasut | 442c0f1 | 2018-08-18 15:58:32 +0200 | [diff] [blame] | 86 | .of_match = dw_apb_timer_ids, |
| 87 | .ofdata_to_platdata = dw_apb_timer_ofdata_to_platdata, |
| 88 | .priv_auto_alloc_size = sizeof(struct dw_apb_timer_priv), |
| 89 | }; |