| Sergei Antonov | 4803f1d | 2023-02-13 20:34:36 +0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * (C) Copyright 2009 Faraday Technology |
| 4 | * Po-Yu Chuang <ratbert@faraday-tech.com> |
| 5 | * |
| 6 | * 23/08/2022 Port to DM |
| 7 | */ |
| 8 | #include <common.h> |
| 9 | #include <dm.h> |
| 10 | #include <log.h> |
| 11 | #include <timer.h> |
| 12 | #include <asm/io.h> |
| 13 | #include <dm/ofnode.h> |
| 14 | #include <faraday/fttmr010.h> |
| 15 | #include <asm/global_data.h> |
| 16 | |
| 17 | #define TIMER_LOAD_VAL 0xffffffff |
| 18 | |
| 19 | struct fttmr010_timer_priv { |
| 20 | struct fttmr010 __iomem *regs; |
| 21 | }; |
| 22 | |
| 23 | static u64 fttmr010_timer_get_count(struct udevice *dev) |
| 24 | { |
| 25 | struct fttmr010_timer_priv *priv = dev_get_priv(dev); |
| 26 | struct fttmr010 *tmr = priv->regs; |
| 27 | u32 now = TIMER_LOAD_VAL - readl(&tmr->timer3_counter); |
| 28 | |
| 29 | /* increment tbu if tbl has rolled over */ |
| 30 | if (now < gd->arch.tbl) |
| 31 | gd->arch.tbu++; |
| 32 | gd->arch.tbl = now; |
| 33 | |
| 34 | return ((u64)gd->arch.tbu << 32) | gd->arch.tbl; |
| 35 | } |
| 36 | |
| 37 | static int fttmr010_timer_probe(struct udevice *dev) |
| 38 | { |
| 39 | struct fttmr010_timer_priv *priv = dev_get_priv(dev); |
| 40 | struct fttmr010 *tmr; |
| 41 | unsigned int cr; |
| 42 | |
| 43 | priv->regs = dev_read_addr_ptr(dev); |
| 44 | if (!priv->regs) |
| 45 | return -EINVAL; |
| 46 | tmr = priv->regs; |
| 47 | |
| 48 | debug("Faraday FTTMR010 timer revision 0x%08X\n", readl(&tmr->revision)); |
| 49 | |
| 50 | /* disable timers */ |
| 51 | writel(0, &tmr->cr); |
| 52 | |
| 53 | /* setup timer */ |
| 54 | writel(TIMER_LOAD_VAL, &tmr->timer3_load); |
| 55 | writel(TIMER_LOAD_VAL, &tmr->timer3_counter); |
| 56 | writel(0, &tmr->timer3_match1); |
| 57 | writel(0, &tmr->timer3_match2); |
| 58 | |
| 59 | /* we don't want timer to issue interrupts */ |
| 60 | writel(FTTMR010_TM3_MATCH1 | |
| 61 | FTTMR010_TM3_MATCH2 | |
| 62 | FTTMR010_TM3_OVERFLOW, |
| 63 | &tmr->interrupt_mask); |
| 64 | |
| 65 | cr = readl(&tmr->cr); |
| 66 | cr |= FTTMR010_TM3_CLOCK; /* use external clock */ |
| 67 | cr |= FTTMR010_TM3_ENABLE; |
| 68 | writel(cr, &tmr->cr); |
| 69 | |
| 70 | gd->arch.tbl = 0; |
| 71 | gd->arch.tbu = 0; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static const struct timer_ops fttmr010_timer_ops = { |
| 77 | .get_count = fttmr010_timer_get_count, |
| 78 | }; |
| 79 | |
| 80 | static const struct udevice_id fttmr010_timer_ids[] = { |
| 81 | { .compatible = "faraday,fttmr010-timer" }, |
| 82 | {} |
| 83 | }; |
| 84 | |
| 85 | U_BOOT_DRIVER(fttmr010_timer) = { |
| 86 | .name = "fttmr010_timer", |
| 87 | .id = UCLASS_TIMER, |
| 88 | .of_match = fttmr010_timer_ids, |
| 89 | .priv_auto = sizeof(struct fttmr010_timer_priv), |
| 90 | .probe = fttmr010_timer_probe, |
| 91 | .ops = &fttmr010_timer_ops, |
| 92 | }; |