/* * arch/arm/plat-omap/include/plat/dmtimer.h * * OMAP Dual-Mode Timers * * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/ * Tarun Kanti DebBarma <tarun.kanti@ti.com> * Thara Gopinath <thara@ti.com> * * Platform device conversion and hwmod support. * * Copyright (C) 2005 Nokia Corporation * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> * PWM and clock framwork support by Timo Teras. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/delay.h> #include <linux/io.h> #include <linux/platform_device.h> #ifndef __ASM_ARCH_DMTIMER_H #define __ASM_ARCH_DMTIMER_H /* clock sources */ #define OMAP_TIMER_SRC_SYS_CLK 0x00 #define OMAP_TIMER_SRC_32_KHZ 0x01 #define OMAP_TIMER_SRC_EXT_CLK 0x02 /* timer interrupt enable bits */ #define OMAP_TIMER_INT_CAPTURE (1 << 2) #define OMAP_TIMER_INT_OVERFLOW (1 << 1) #define OMAP_TIMER_INT_MATCH (1 << 0) /* trigger types */ #define OMAP_TIMER_TRIGGER_NONE 0x00 #define OMAP_TIMER_TRIGGER_OVERFLOW 0x01 #define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02 /* posted mode types */ #define OMAP_TIMER_NONPOSTED 0x00 #define OMAP_TIMER_POSTED 0x01 /* timer capabilities used in hwmod database */ #define OMAP_TIMER_SECURE 0x80000000 #define OMAP_TIMER_ALWON 0x40000000 #define OMAP_TIMER_HAS_PWM 0x20000000 #define OMAP_TIMER_NEEDS_RESET 0x10000000 #define OMAP_TIMER_HAS_DSP_IRQ 0x08000000 /* * timer errata flags * * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This * errata prevents us from using posted mode on these devices, unless the * timer counter register is never read. For more details please refer to * the OMAP3/4/5 errata documents. */ #define OMAP_TIMER_ERRATA_I103_I767 0x80000000 struct omap_timer_capability_dev_attr { u32 timer_capability; }; struct timer_regs { u32 tidr; u32 tier; u32 twer; u32 tclr; u32 tcrr; u32 tldr; u32 ttrg; u32 twps; u32 tmar; u32 tcar1; u32 tsicr; u32 tcar2; u32 tpir; u32 tnir; u32 tcvr; u32 tocr; u32 towr; }; struct omap_dm_timer { int id; int irq; struct clk *fclk; void __iomem *io_base; void __iomem *irq_stat; /* TISR/IRQSTATUS interrupt status */ void __iomem *irq_ena; /* irq enable */ void __iomem *irq_dis; /* irq disable, only on v2 ip */ void __iomem *pend; /* write pending */ void __iomem *func_base; /* function register base */ unsigned long rate; unsigned reserved:1; unsigned posted:1; struct timer_regs context; int (*get_context_loss_count)(struct device *); int ctx_loss_count; int revision; u32 capability; u32 errata; struct platform_device *pdev; struct list_head node; }; int omap_dm_timer_reserve_systimer(int id); struct omap_dm_timer *omap_dm_timer_request(void); struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id); struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap); struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np); int omap_dm_timer_free(struct omap_dm_timer *timer); void omap_dm_timer_enable(struct omap_dm_timer *timer); void omap_dm_timer_disable(struct omap_dm_timer *timer); int omap_dm_timer_get_irq(struct omap_dm_timer *timer); u32 omap_dm_timer_modify_idlect_mask(u32 inputmask); struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer); int omap_dm_timer_trigger(struct omap_dm_timer *timer); int omap_dm_timer_start(struct omap_dm_timer *timer); int omap_dm_timer_stop(struct omap_dm_timer *timer); int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source); int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value); int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value); int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match); int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger); int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler); int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value); int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask); unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer); int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value); unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer); int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value); int omap_dm_timers_active(void); /* * Do not use the defines below, they are not needed. They should be only * used by dmtimer.c and sys_timer related code. */ /* * The interrupt registers are different between v1 and v2 ip. * These registers are offsets from timer->iobase. */ #define OMAP_TIMER_ID_OFFSET 0x00 #define OMAP_TIMER_OCP_CFG_OFFSET 0x10 #define OMAP_TIMER_V1_SYS_STAT_OFFSET 0x14 #define OMAP_TIMER_V1_STAT_OFFSET 0x18 #define OMAP_TIMER_V1_INT_EN_OFFSET 0x1c #define OMAP_TIMER_V2_IRQSTATUS_RAW 0x24 #define OMAP_TIMER_V2_IRQSTATUS 0x28 #define OMAP_TIMER_V2_IRQENABLE_SET 0x2c #define OMAP_TIMER_V2_IRQENABLE_CLR 0x30 /* * The functional registers have a different base on v1 and v2 ip. * These registers are offsets from timer->func_base. The func_base * is samae as io_base for v1 and io_base + 0x14 for v2 ip. * */ #define OMAP_TIMER_V2_FUNC_OFFSET 0x14 #define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20 #define _OMAP_TIMER_CTRL_OFFSET 0x24 #define OMAP_TIMER_CTRL_GPOCFG (1 << 14) #define OMAP_TIMER_CTRL_CAPTMODE (1 << 13) #define OMAP_TIMER_CTRL_PT (1 << 12) #define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8) #define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8) #define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8) #define OMAP_TIMER_CTRL_SCPWM (1 << 7) #define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */ #define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */ #define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* prescaler value shift */ #define OMAP_TIMER_CTRL_POSTED (1 << 2) #define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */ #define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */ #define _OMAP_TIMER_COUNTER_OFFSET 0x28 #define _OMAP_TIMER_LOAD_OFFSET 0x2c #define _OMAP_TIMER_TRIGGER_OFFSET 0x30 #define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34 #define WP_NONE 0 /* no write pending bit */ #define WP_TCLR (1 << 0) #define WP_TCRR (1 << 1) #define WP_TLDR (1 << 2) #define WP_TTGR (1 << 3) #define WP_TMAR (1 << 4) #define WP_TPIR (1 << 5) #define WP_TNIR (1 << 6) #define WP_TCVR (1 << 7) #define WP_TOCR (1 << 8) #define WP_TOWR (1 << 9) #define _OMAP_TIMER_MATCH_OFFSET 0x38 #define _OMAP_TIMER_CAPTURE_OFFSET 0x3c #define _OMAP_TIMER_IF_CTRL_OFFSET 0x40 #define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */ #define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */ #define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */ #define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */ #define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */ #define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */ /* register offsets with the write pending bit encoded */ #define WPSHIFT 16 #define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \ | (WP_NONE << WPSHIFT)) #define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \ | (WP_TCLR << WPSHIFT)) #define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \ | (WP_TCRR << WPSHIFT)) #define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \ | (WP_TLDR << WPSHIFT)) #define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \ | (WP_TTGR << WPSHIFT)) #define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \ | (WP_NONE << WPSHIFT)) #define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \ | (WP_TMAR << WPSHIFT)) #define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \ | (WP_NONE << WPSHIFT)) #define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \ | (WP_NONE << WPSHIFT)) #define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \ | (WP_NONE << WPSHIFT)) #define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \ | (WP_TPIR << WPSHIFT)) #define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \ | (WP_TNIR << WPSHIFT)) #define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \ | (WP_TCVR << WPSHIFT)) #define OMAP_TIMER_TICK_INT_MASK_SET_REG \ (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT)) #define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \ (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT)) static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg, int posted) { if (posted) while (readl_relaxed(timer->pend) & (reg >> WPSHIFT)) cpu_relax(); return readl_relaxed(timer->func_base + (reg & 0xff)); } static inline void __omap_dm_timer_write(struct omap_dm_timer *timer, u32 reg, u32 val, int posted) { if (posted) while (readl_relaxed(timer->pend) & (reg >> WPSHIFT)) cpu_relax(); writel_relaxed(val, timer->func_base + (reg & 0xff)); } static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer) { u32 tidr; /* Assume v1 ip if bits [31:16] are zero */ tidr = readl_relaxed(timer->io_base); if (!(tidr >> 16)) { timer->revision = 1; timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET; timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET; timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET; timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET; timer->func_base = timer->io_base; } else { timer->revision = 2; timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS; timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET; timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR; timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET + OMAP_TIMER_V2_FUNC_OFFSET; timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET; } } /* * __omap_dm_timer_enable_posted - enables write posted mode * @timer: pointer to timer instance handle * * Enables the write posted mode for the timer. When posted mode is enabled * writes to certain timer registers are immediately acknowledged by the * internal bus and hence prevents stalling the CPU waiting for the write to * complete. Enabling this feature can improve performance for writing to the * timer registers. */ static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer) { if (timer->posted) return; if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) { timer->posted = OMAP_TIMER_NONPOSTED; __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0); return; } __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, OMAP_TIMER_CTRL_POSTED, 0); timer->context.tsicr = OMAP_TIMER_CTRL_POSTED; timer->posted = OMAP_TIMER_POSTED; } /** * __omap_dm_timer_override_errata - override errata flags for a timer * @timer: pointer to timer handle * @errata: errata flags to be ignored * * For a given timer, override a timer errata by clearing the flags * specified by the errata argument. A specific erratum should only be * overridden for a timer if the timer is used in such a way the erratum * has no impact. */ static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer, u32 errata) { timer->errata &= ~errata; } static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer, int posted, unsigned long rate) { u32 l; l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted); if (l & OMAP_TIMER_CTRL_ST) { l &= ~0x1; __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted); #ifdef CONFIG_ARCH_OMAP2PLUS /* Readback to make sure write has completed */ __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted); /* * Wait for functional clock period x 3.5 to make sure that * timer is stopped */ udelay(3500000 / rate + 1); #endif } /* Ack possibly pending interrupt */ writel_relaxed(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat); } static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer, u32 ctrl, unsigned int load, int posted) { __omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted); __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted); } static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer, unsigned int value) { writel_relaxed(value, timer->irq_ena); __omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0); } static inline unsigned int __omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted) { return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted); } static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value) { writel_relaxed(value, timer->irq_stat); } #endif /* __ASM_ARCH_DMTIMER_H */