| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2011 |
| 3 | * |
| 4 | * License Terms: GNU General Public License v2 |
| 5 | * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson |
| 6 | */ |
| 7 | #include <linux/io.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/clksrc-dbx500-prcmu.h> |
| 10 | #include <linux/of.h> |
| 11 | |
| 12 | #include <asm/smp_twd.h> |
| 13 | |
| 14 | #include <plat/mtu.h> |
| 15 | |
| 16 | #include <mach/setup.h> |
| 17 | #include <mach/hardware.h> |
| 18 | #include <mach/irqs.h> |
| 19 | |
| 20 | #ifdef CONFIG_HAVE_ARM_TWD |
| 21 | static DEFINE_TWD_LOCAL_TIMER(u5500_twd_local_timer, |
| 22 | U5500_TWD_BASE, IRQ_LOCALTIMER); |
| 23 | static DEFINE_TWD_LOCAL_TIMER(u8500_twd_local_timer, |
| 24 | U8500_TWD_BASE, IRQ_LOCALTIMER); |
| 25 | |
| 26 | static void __init ux500_twd_init(void) |
| 27 | { |
| 28 | struct twd_local_timer *twd_local_timer; |
| 29 | int err; |
| 30 | |
| 31 | twd_local_timer = cpu_is_u5500() ? &u5500_twd_local_timer : |
| 32 | &u8500_twd_local_timer; |
| 33 | |
| 34 | if (of_have_populated_dt()) |
| 35 | twd_local_timer_of_register(); |
| 36 | else { |
| 37 | err = twd_local_timer_register(twd_local_timer); |
| 38 | if (err) |
| 39 | pr_err("twd_local_timer_register failed %d\n", err); |
| 40 | } |
| 41 | } |
| 42 | #else |
| 43 | #define ux500_twd_init() do { } while(0) |
| 44 | #endif |
| 45 | |
| 46 | static void __init ux500_timer_init(void) |
| 47 | { |
| 48 | void __iomem *mtu_timer_base; |
| 49 | void __iomem *prcmu_timer_base; |
| 50 | |
| 51 | if (cpu_is_u5500()) { |
| 52 | mtu_timer_base = __io_address(U5500_MTU0_BASE); |
| 53 | prcmu_timer_base = __io_address(U5500_PRCMU_TIMER_3_BASE); |
| 54 | } else if (cpu_is_u8500()) { |
| 55 | mtu_timer_base = __io_address(U8500_MTU0_BASE); |
| 56 | prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE); |
| 57 | } else { |
| 58 | ux500_unknown_soc(); |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Here we register the timerblocks active in the system. |
| 63 | * Localtimers (twd) is started when both cpu is up and running. |
| 64 | * MTU register a clocksource, clockevent and sched_clock. |
| 65 | * Since the MTU is located in the VAPE power domain |
| 66 | * it will be cleared in sleep which makes it unsuitable. |
| 67 | * We however need it as a timer tick (clockevent) |
| 68 | * during boot to calibrate delay until twd is started. |
| 69 | * RTC-RTT have problems as timer tick during boot since it is |
| 70 | * depending on delay which is not yet calibrated. RTC-RTT is in the |
| 71 | * always-on powerdomain and is used as clockevent instead of twd when |
| 72 | * sleeping. |
| 73 | * The PRCMU timer 4(3 for DB5500) register a clocksource and |
| 74 | * sched_clock with higher rating then MTU since is always-on. |
| 75 | * |
| 76 | */ |
| 77 | |
| 78 | nmdk_timer_init(mtu_timer_base); |
| 79 | clksrc_dbx500_prcmu_init(prcmu_timer_base); |
| 80 | ux500_twd_init(); |
| 81 | } |
| 82 | |
| 83 | static void ux500_timer_reset(void) |
| 84 | { |
| 85 | nmdk_clkevt_reset(); |
| 86 | nmdk_clksrc_reset(); |
| 87 | } |
| 88 | |
| 89 | struct sys_timer ux500_timer = { |
| 90 | .init = ux500_timer_init, |
| 91 | .resume = ux500_timer_reset, |
| 92 | }; |