| /* |
| * arch/arm/plat-omap/include/mach/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/clk.h> |
| #include <linux/delay.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 |
| |
| /* |
| * IP revision identifier so that Highlander IP |
| * in OMAP4 can be distinguished. |
| */ |
| #define OMAP_TIMER_IP_VERSION_1 0x1 |
| struct omap_dm_timer; |
| struct clk; |
| |
| struct omap_dm_timer *omap_dm_timer_request(void); |
| struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id); |
| void 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); |
| |
| void omap_dm_timer_trigger(struct omap_dm_timer *timer); |
| void omap_dm_timer_start(struct omap_dm_timer *timer); |
| void omap_dm_timer_stop(struct omap_dm_timer *timer); |
| |
| int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source); |
| void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value); |
| void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value); |
| void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match); |
| void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger); |
| void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler); |
| |
| void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value); |
| |
| unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer); |
| void 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); |
| void 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. |
| */ |
| |
| /* register offsets */ |
| #define _OMAP_TIMER_ID_OFFSET 0x00 |
| #define _OMAP_TIMER_OCP_CFG_OFFSET 0x10 |
| #define _OMAP_TIMER_SYS_STAT_OFFSET 0x14 |
| #define _OMAP_TIMER_STAT_OFFSET 0x18 |
| #define _OMAP_TIMER_INT_EN_OFFSET 0x1c |
| #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_ID_REG (_OMAP_TIMER_ID_OFFSET \ |
| | (WP_NONE << WPSHIFT)) |
| |
| #define OMAP_TIMER_OCP_CFG_REG (_OMAP_TIMER_OCP_CFG_OFFSET \ |
| | (WP_NONE << WPSHIFT)) |
| |
| #define OMAP_TIMER_SYS_STAT_REG (_OMAP_TIMER_SYS_STAT_OFFSET \ |
| | (WP_NONE << WPSHIFT)) |
| |
| #define OMAP_TIMER_STAT_REG (_OMAP_TIMER_STAT_OFFSET \ |
| | (WP_NONE << WPSHIFT)) |
| |
| #define OMAP_TIMER_INT_EN_REG (_OMAP_TIMER_INT_EN_OFFSET \ |
| | (WP_NONE << WPSHIFT)) |
| |
| #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)) |
| |
| struct omap_dm_timer { |
| unsigned long phys_base; |
| int irq; |
| #ifdef CONFIG_ARCH_OMAP2PLUS |
| struct clk *iclk, *fclk; |
| #endif |
| void __iomem *io_base; |
| unsigned long rate; |
| unsigned reserved:1; |
| unsigned enabled:1; |
| unsigned posted:1; |
| }; |
| |
| extern u32 sys_timer_reserved; |
| void omap_dm_timer_prepare(struct omap_dm_timer *timer); |
| |
| static inline u32 __omap_dm_timer_read(void __iomem *base, u32 reg, |
| int posted) |
| { |
| if (posted) |
| while (__raw_readl(base + (OMAP_TIMER_WRITE_PEND_REG & 0xff)) |
| & (reg >> WPSHIFT)) |
| cpu_relax(); |
| |
| return __raw_readl(base + (reg & 0xff)); |
| } |
| |
| static inline void __omap_dm_timer_write(void __iomem *base, u32 reg, u32 val, |
| int posted) |
| { |
| if (posted) |
| while (__raw_readl(base + (OMAP_TIMER_WRITE_PEND_REG & 0xff)) |
| & (reg >> WPSHIFT)) |
| cpu_relax(); |
| |
| __raw_writel(val, base + (reg & 0xff)); |
| } |
| |
| /* Assumes the source clock has been set by caller */ |
| static inline void __omap_dm_timer_reset(void __iomem *base, int autoidle, |
| int wakeup) |
| { |
| u32 l; |
| |
| l = __omap_dm_timer_read(base, OMAP_TIMER_OCP_CFG_REG, 0); |
| l |= 0x02 << 3; /* Set to smart-idle mode */ |
| l |= 0x2 << 8; /* Set clock activity to perserve f-clock on idle */ |
| |
| if (autoidle) |
| l |= 0x1 << 0; |
| |
| if (wakeup) |
| l |= 1 << 2; |
| |
| __omap_dm_timer_write(base, OMAP_TIMER_OCP_CFG_REG, l, 0); |
| |
| /* Match hardware reset default of posted mode */ |
| __omap_dm_timer_write(base, OMAP_TIMER_IF_CTRL_REG, |
| OMAP_TIMER_CTRL_POSTED, 0); |
| } |
| |
| static inline int __omap_dm_timer_set_source(struct clk *timer_fck, |
| struct clk *parent) |
| { |
| int ret; |
| |
| clk_disable(timer_fck); |
| ret = clk_set_parent(timer_fck, parent); |
| clk_enable(timer_fck); |
| |
| /* |
| * When the functional clock disappears, too quick writes seem |
| * to cause an abort. XXX Is this still necessary? |
| */ |
| __delay(300000); |
| |
| return ret; |
| } |
| |
| static inline void __omap_dm_timer_stop(void __iomem *base, int posted, |
| unsigned long rate) |
| { |
| u32 l; |
| |
| l = __omap_dm_timer_read(base, OMAP_TIMER_CTRL_REG, posted); |
| if (l & OMAP_TIMER_CTRL_ST) { |
| l &= ~0x1; |
| __omap_dm_timer_write(base, OMAP_TIMER_CTRL_REG, l, posted); |
| #ifdef CONFIG_ARCH_OMAP2PLUS |
| /* Readback to make sure write has completed */ |
| __omap_dm_timer_read(base, 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 */ |
| __omap_dm_timer_write(base, OMAP_TIMER_STAT_REG, |
| OMAP_TIMER_INT_OVERFLOW, 0); |
| } |
| |
| static inline void __omap_dm_timer_load_start(void __iomem *base, u32 ctrl, |
| unsigned int load, int posted) |
| { |
| __omap_dm_timer_write(base, OMAP_TIMER_COUNTER_REG, load, posted); |
| __omap_dm_timer_write(base, OMAP_TIMER_CTRL_REG, ctrl, posted); |
| } |
| |
| static inline void __omap_dm_timer_int_enable(void __iomem *base, |
| unsigned int value) |
| { |
| __omap_dm_timer_write(base, OMAP_TIMER_INT_EN_REG, value, 0); |
| __omap_dm_timer_write(base, OMAP_TIMER_WAKEUP_EN_REG, value, 0); |
| } |
| |
| static inline unsigned int __omap_dm_timer_read_counter(void __iomem *base, |
| int posted) |
| { |
| return __omap_dm_timer_read(base, OMAP_TIMER_COUNTER_REG, posted); |
| } |
| |
| static inline void __omap_dm_timer_write_status(void __iomem *base, |
| unsigned int value) |
| { |
| __omap_dm_timer_write(base, OMAP_TIMER_STAT_REG, value, 0); |
| } |
| |
| #endif /* __ASM_ARCH_DMTIMER_H */ |