diff options
Diffstat (limited to 'drivers/clocksource/timer-ti-dm.c')
| -rw-r--r-- | drivers/clocksource/timer-ti-dm.c | 1290 |
1 files changed, 1290 insertions, 0 deletions
diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c new file mode 100644 index 000000000..7f9c1f58a --- /dev/null +++ b/drivers/clocksource/timer-ti-dm.c @@ -0,0 +1,1290 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * linux/arch/arm/plat-omap/dmtimer.c + * + * OMAP Dual-Mode Timers + * + * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/ + * Tarun Kanti DebBarma <tarun.kanti@ti.com> + * Thara Gopinath <thara@ti.com> + * + * dmtimer adaptation to platform_driver. + * + * Copyright (C) 2005 Nokia Corporation + * OMAP2 support by Juha Yrjola + * API improvements and OMAP2 clock framework support by Timo Teras + * + * Copyright (C) 2009 Texas Instruments + * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com> + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/cpu_pm.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/platform_data/dmtimer-omap.h> + +#include <clocksource/timer-ti-dm.h> + +/* + * 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 + +/* posted mode types */ +#define OMAP_TIMER_NONPOSTED 0x00 +#define OMAP_TIMER_POSTED 0x01 + +/* 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)) + +struct timer_regs { + u32 ocp_cfg; + 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 dmtimer { + struct omap_dm_timer cookie; + int id; + int irq; + struct clk *fclk; + + void __iomem *io_base; + int irq_stat; /* TISR/IRQSTATUS interrupt status */ + int irq_ena; /* irq enable */ + int irq_dis; /* irq disable, only on v2 ip */ + void __iomem *pend; /* write pending */ + void __iomem *func_base; /* function register base */ + + atomic_t enabled; + unsigned long rate; + unsigned reserved:1; + unsigned posted:1; + unsigned omap1:1; + struct timer_regs context; + int revision; + u32 capability; + u32 errata; + struct platform_device *pdev; + struct list_head node; + struct notifier_block nb; + struct notifier_block fclk_nb; + unsigned long fclk_rate; +}; + +static u32 omap_reserved_systimers; +static LIST_HEAD(omap_timer_list); +static DEFINE_SPINLOCK(dm_timer_lock); + +enum { + REQUEST_ANY = 0, + REQUEST_BY_ID, + REQUEST_BY_CAP, + REQUEST_BY_NODE, +}; + +/** + * dmtimer_read - read timer registers in posted and non-posted mode + * @timer: timer pointer over which read operation to perform + * @reg: lowest byte holds the register offset + * + * The posted mode bit is encoded in reg. Note that in posted mode, write + * pending bit must be checked. Otherwise a read of a non completed write + * will produce an error. + */ +static inline u32 dmtimer_read(struct dmtimer *timer, u32 reg) +{ + u16 wp, offset; + + wp = reg >> WPSHIFT; + offset = reg & 0xff; + + /* Wait for a possible write pending bit in posted mode */ + if (wp && timer->posted) + while (readl_relaxed(timer->pend) & wp) + cpu_relax(); + + return readl_relaxed(timer->func_base + offset); +} + +/** + * dmtimer_write - write timer registers in posted and non-posted mode + * @timer: timer pointer over which write operation is to perform + * @reg: lowest byte holds the register offset + * @val: data to write into the register + * + * The posted mode bit is encoded in reg. Note that in posted mode, the write + * pending bit must be checked. Otherwise a write on a register which has a + * pending write will be lost. + */ +static inline void dmtimer_write(struct dmtimer *timer, u32 reg, u32 val) +{ + u16 wp, offset; + + wp = reg >> WPSHIFT; + offset = reg & 0xff; + + /* Wait for a possible write pending bit in posted mode */ + if (wp && timer->posted) + while (readl_relaxed(timer->pend) & wp) + cpu_relax(); + + writel_relaxed(val, timer->func_base + offset); +} + +static inline void __omap_dm_timer_init_regs(struct dmtimer *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 = OMAP_TIMER_V1_STAT_OFFSET; + timer->irq_ena = OMAP_TIMER_V1_INT_EN_OFFSET; + timer->irq_dis = 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 = OMAP_TIMER_V2_IRQSTATUS - OMAP_TIMER_V2_FUNC_OFFSET; + timer->irq_ena = OMAP_TIMER_V2_IRQENABLE_SET - OMAP_TIMER_V2_FUNC_OFFSET; + timer->irq_dis = OMAP_TIMER_V2_IRQENABLE_CLR - OMAP_TIMER_V2_FUNC_OFFSET; + 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 dmtimer *timer) +{ + if (timer->posted) + return; + + if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) { + timer->posted = OMAP_TIMER_NONPOSTED; + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0); + return; + } + + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, OMAP_TIMER_CTRL_POSTED); + timer->context.tsicr = OMAP_TIMER_CTRL_POSTED; + timer->posted = OMAP_TIMER_POSTED; +} + +static inline void __omap_dm_timer_stop(struct dmtimer *timer) +{ + u32 l; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + if (l & OMAP_TIMER_CTRL_ST) { + l &= ~0x1; + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); +#ifdef CONFIG_ARCH_OMAP2PLUS + /* Readback to make sure write has completed */ + dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + /* + * Wait for functional clock period x 3.5 to make sure that + * timer is stopped + */ + udelay(3500000 / timer->fclk_rate + 1); +#endif + } + + /* Ack possibly pending interrupt */ + dmtimer_write(timer, timer->irq_stat, OMAP_TIMER_INT_OVERFLOW); +} + +static inline void __omap_dm_timer_int_enable(struct dmtimer *timer, + unsigned int value) +{ + dmtimer_write(timer, timer->irq_ena, value); + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value); +} + +static inline unsigned int +__omap_dm_timer_read_counter(struct dmtimer *timer) +{ + return dmtimer_read(timer, OMAP_TIMER_COUNTER_REG); +} + +static inline void __omap_dm_timer_write_status(struct dmtimer *timer, + unsigned int value) +{ + dmtimer_write(timer, timer->irq_stat, value); +} + +static void omap_timer_restore_context(struct dmtimer *timer) +{ + dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, timer->context.ocp_cfg); + + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, timer->context.twer); + dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, timer->context.tcrr); + dmtimer_write(timer, OMAP_TIMER_LOAD_REG, timer->context.tldr); + dmtimer_write(timer, OMAP_TIMER_MATCH_REG, timer->context.tmar); + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, timer->context.tsicr); + dmtimer_write(timer, timer->irq_ena, timer->context.tier); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, timer->context.tclr); +} + +static void omap_timer_save_context(struct dmtimer *timer) +{ + timer->context.ocp_cfg = dmtimer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET); + + timer->context.tclr = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + timer->context.twer = dmtimer_read(timer, OMAP_TIMER_WAKEUP_EN_REG); + timer->context.tldr = dmtimer_read(timer, OMAP_TIMER_LOAD_REG); + timer->context.tmar = dmtimer_read(timer, OMAP_TIMER_MATCH_REG); + timer->context.tier = dmtimer_read(timer, timer->irq_ena); + timer->context.tsicr = dmtimer_read(timer, OMAP_TIMER_IF_CTRL_REG); +} + +static int omap_timer_context_notifier(struct notifier_block *nb, + unsigned long cmd, void *v) +{ + struct dmtimer *timer; + + timer = container_of(nb, struct dmtimer, nb); + + switch (cmd) { + case CPU_CLUSTER_PM_ENTER: + if ((timer->capability & OMAP_TIMER_ALWON) || + !atomic_read(&timer->enabled)) + break; + omap_timer_save_context(timer); + break; + case CPU_CLUSTER_PM_ENTER_FAILED: /* No need to restore context */ + break; + case CPU_CLUSTER_PM_EXIT: + if ((timer->capability & OMAP_TIMER_ALWON) || + !atomic_read(&timer->enabled)) + break; + omap_timer_restore_context(timer); + break; + } + + return NOTIFY_OK; +} + +static int omap_timer_fclk_notifier(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct clk_notifier_data *clk_data = data; + struct dmtimer *timer = container_of(nb, struct dmtimer, fclk_nb); + + switch (event) { + case POST_RATE_CHANGE: + timer->fclk_rate = clk_data->new_rate; + return NOTIFY_OK; + default: + return NOTIFY_DONE; + } +} + +static int omap_dm_timer_reset(struct dmtimer *timer) +{ + u32 l, timeout = 100000; + + if (timer->revision != 1) + return -EINVAL; + + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0x06); + + do { + l = dmtimer_read(timer, OMAP_TIMER_V1_SYS_STAT_OFFSET); + } while (!l && timeout--); + + if (!timeout) { + dev_err(&timer->pdev->dev, "Timer failed to reset\n"); + return -ETIMEDOUT; + } + + /* Configure timer for smart-idle mode */ + l = dmtimer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET); + l |= 0x2 << 0x3; + dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l); + + timer->posted = 0; + + return 0; +} + +/* + * Functions exposed to PWM and remoteproc drivers via platform_data. + * Do not use these in the driver, these will get deprecated and will + * will be replaced by Linux generic framework functions such as + * chained interrupts and clock framework. + */ +static struct dmtimer *to_dmtimer(struct omap_dm_timer *cookie) +{ + if (!cookie) + return NULL; + + return container_of(cookie, struct dmtimer, cookie); +} + +static int omap_dm_timer_set_source(struct omap_dm_timer *cookie, int source) +{ + int ret; + const char *parent_name; + struct clk *parent; + struct dmtimer_platform_data *pdata; + struct dmtimer *timer; + + timer = to_dmtimer(cookie); + if (unlikely(!timer) || IS_ERR(timer->fclk)) + return -EINVAL; + + switch (source) { + case OMAP_TIMER_SRC_SYS_CLK: + parent_name = "timer_sys_ck"; + break; + case OMAP_TIMER_SRC_32_KHZ: + parent_name = "timer_32k_ck"; + break; + case OMAP_TIMER_SRC_EXT_CLK: + parent_name = "timer_ext_ck"; + break; + default: + return -EINVAL; + } + + pdata = timer->pdev->dev.platform_data; + + /* + * FIXME: Used for OMAP1 devices only because they do not currently + * use the clock framework to set the parent clock. To be removed + * once OMAP1 migrated to using clock framework for dmtimers + */ + if (timer->omap1 && pdata && pdata->set_timer_src) + return pdata->set_timer_src(timer->pdev, source); + +#if defined(CONFIG_COMMON_CLK) + /* Check if the clock has configurable parents */ + if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2) + return 0; +#endif + + parent = clk_get(&timer->pdev->dev, parent_name); + if (IS_ERR(parent)) { + pr_err("%s: %s not found\n", __func__, parent_name); + return -EINVAL; + } + + ret = clk_set_parent(timer->fclk, parent); + if (ret < 0) + pr_err("%s: failed to set %s as parent\n", __func__, + parent_name); + + clk_put(parent); + + return ret; +} + +static void omap_dm_timer_enable(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer = to_dmtimer(cookie); + struct device *dev = &timer->pdev->dev; + int rc; + + rc = pm_runtime_resume_and_get(dev); + if (rc) + dev_err(dev, "could not enable timer\n"); +} + +static void omap_dm_timer_disable(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer = to_dmtimer(cookie); + struct device *dev = &timer->pdev->dev; + + pm_runtime_put_sync(dev); +} + +static int omap_dm_timer_prepare(struct dmtimer *timer) +{ + struct device *dev = &timer->pdev->dev; + int rc; + + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + if (timer->capability & OMAP_TIMER_NEEDS_RESET) { + rc = omap_dm_timer_reset(timer); + if (rc) { + pm_runtime_put_sync(dev); + return rc; + } + } + + __omap_dm_timer_enable_posted(timer); + pm_runtime_put_sync(dev); + + return 0; +} + +static inline u32 omap_dm_timer_reserved_systimer(int id) +{ + return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0; +} + +static struct dmtimer *_omap_dm_timer_request(int req_type, void *data) +{ + struct dmtimer *timer = NULL, *t; + struct device_node *np = NULL; + unsigned long flags; + u32 cap = 0; + int id = 0; + + switch (req_type) { + case REQUEST_BY_ID: + id = *(int *)data; + break; + case REQUEST_BY_CAP: + cap = *(u32 *)data; + break; + case REQUEST_BY_NODE: + np = (struct device_node *)data; + break; + default: + /* REQUEST_ANY */ + break; + } + + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry(t, &omap_timer_list, node) { + if (t->reserved) + continue; + + switch (req_type) { + case REQUEST_BY_ID: + if (id == t->pdev->id) { + timer = t; + timer->reserved = 1; + goto found; + } + break; + case REQUEST_BY_CAP: + if (cap == (t->capability & cap)) { + /* + * If timer is not NULL, we have already found + * one timer. But it was not an exact match + * because it had more capabilities than what + * was required. Therefore, unreserve the last + * timer found and see if this one is a better + * match. + */ + if (timer) + timer->reserved = 0; + timer = t; + timer->reserved = 1; + + /* Exit loop early if we find an exact match */ + if (t->capability == cap) + goto found; + } + break; + case REQUEST_BY_NODE: + if (np == t->pdev->dev.of_node) { + timer = t; + timer->reserved = 1; + goto found; + } + break; + default: + /* REQUEST_ANY */ + timer = t; + timer->reserved = 1; + goto found; + } + } +found: + spin_unlock_irqrestore(&dm_timer_lock, flags); + + if (timer && omap_dm_timer_prepare(timer)) { + timer->reserved = 0; + timer = NULL; + } + + if (!timer) + pr_debug("%s: timer request failed!\n", __func__); + + return timer; +} + +static struct omap_dm_timer *omap_dm_timer_request(void) +{ + struct dmtimer *timer; + + timer = _omap_dm_timer_request(REQUEST_ANY, NULL); + if (!timer) + return NULL; + + return &timer->cookie; +} + +static struct omap_dm_timer *omap_dm_timer_request_specific(int id) +{ + struct dmtimer *timer; + + /* Requesting timer by ID is not supported when device tree is used */ + if (of_have_populated_dt()) { + pr_warn("%s: Please use omap_dm_timer_request_by_node()\n", + __func__); + return NULL; + } + + timer = _omap_dm_timer_request(REQUEST_BY_ID, &id); + if (!timer) + return NULL; + + return &timer->cookie; +} + +/** + * omap_dm_timer_request_by_node - Request a timer by device-tree node + * @np: Pointer to device-tree timer node + * + * Request a timer based upon a device node pointer. Returns pointer to + * timer handle on success and a NULL pointer on failure. + */ +static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np) +{ + struct dmtimer *timer; + + if (!np) + return NULL; + + timer = _omap_dm_timer_request(REQUEST_BY_NODE, np); + if (!timer) + return NULL; + + return &timer->cookie; +} + +static int omap_dm_timer_free(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + WARN_ON(!timer->reserved); + timer->reserved = 0; + return 0; +} + +int omap_dm_timer_get_irq(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer = to_dmtimer(cookie); + if (timer) + return timer->irq; + return -EINVAL; +} + +#if defined(CONFIG_ARCH_OMAP1) +#include <linux/soc/ti/omap1-io.h> + +static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *cookie) +{ + return NULL; +} + +/** + * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR + * @inputmask: current value of idlect mask + */ +__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask) +{ + int i = 0; + struct dmtimer *timer = NULL; + unsigned long flags; + + /* If ARMXOR cannot be idled this function call is unnecessary */ + if (!(inputmask & (1 << 1))) + return inputmask; + + /* If any active timer is using ARMXOR return modified mask */ + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry(timer, &omap_timer_list, node) { + u32 l; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + if (l & OMAP_TIMER_CTRL_ST) { + if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0) + inputmask &= ~(1 << 1); + else + inputmask &= ~(1 << 2); + } + i++; + } + spin_unlock_irqrestore(&dm_timer_lock, flags); + + return inputmask; +} + +#else + +static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer = to_dmtimer(cookie); + + if (timer && !IS_ERR(timer->fclk)) + return timer->fclk; + return NULL; +} + +__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask) +{ + BUG(); + + return 0; +} + +#endif + +static int omap_dm_timer_start(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + u32 l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + if (!(l & OMAP_TIMER_CTRL_ST)) { + l |= OMAP_TIMER_CTRL_ST; + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); + } + + return 0; +} + +static int omap_dm_timer_stop(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + struct device *dev; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + + __omap_dm_timer_stop(timer); + + pm_runtime_put_sync(dev); + + return 0; +} + +static int omap_dm_timer_set_load(struct omap_dm_timer *cookie, + unsigned int load) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + dmtimer_write(timer, OMAP_TIMER_LOAD_REG, load); + + pm_runtime_put_sync(dev); + + return 0; +} + +static int omap_dm_timer_set_match(struct omap_dm_timer *cookie, int enable, + unsigned int match) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + u32 l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + if (enable) + l |= OMAP_TIMER_CTRL_CE; + else + l &= ~OMAP_TIMER_CTRL_CE; + dmtimer_write(timer, OMAP_TIMER_MATCH_REG, match); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); + + pm_runtime_put_sync(dev); + + return 0; +} + +static int omap_dm_timer_set_pwm(struct omap_dm_timer *cookie, int def_on, + int toggle, int trigger, int autoreload) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + u32 l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM | + OMAP_TIMER_CTRL_PT | (0x03 << 10) | OMAP_TIMER_CTRL_AR); + if (def_on) + l |= OMAP_TIMER_CTRL_SCPWM; + if (toggle) + l |= OMAP_TIMER_CTRL_PT; + l |= trigger << 10; + if (autoreload) + l |= OMAP_TIMER_CTRL_AR; + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); + + pm_runtime_put_sync(dev); + + return 0; +} + +static int omap_dm_timer_get_pwm_status(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + u32 l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + + pm_runtime_put_sync(dev); + + return l; +} + +static int omap_dm_timer_set_prescaler(struct omap_dm_timer *cookie, + int prescaler) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + u32 l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer) || prescaler < -1 || prescaler > 7) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); + l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2)); + if (prescaler >= 0) { + l |= OMAP_TIMER_CTRL_PRE; + l |= prescaler << 2; + } + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); + + pm_runtime_put_sync(dev); + + return 0; +} + +static int omap_dm_timer_set_int_enable(struct omap_dm_timer *cookie, + unsigned int value) +{ + struct dmtimer *timer; + struct device *dev; + int rc; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + __omap_dm_timer_int_enable(timer, value); + + pm_runtime_put_sync(dev); + + return 0; +} + +/** + * omap_dm_timer_set_int_disable - disable timer interrupts + * @cookie: pointer to timer cookie + * @mask: bit mask of interrupts to be disabled + * + * Disables the specified timer interrupts for a timer. + */ +static int omap_dm_timer_set_int_disable(struct omap_dm_timer *cookie, u32 mask) +{ + struct dmtimer *timer; + struct device *dev; + u32 l = mask; + int rc; + + timer = to_dmtimer(cookie); + if (unlikely(!timer)) + return -EINVAL; + + dev = &timer->pdev->dev; + rc = pm_runtime_resume_and_get(dev); + if (rc) + return rc; + + if (timer->revision == 1) + l = dmtimer_read(timer, timer->irq_ena) & ~mask; + + dmtimer_write(timer, timer->irq_dis, l); + l = dmtimer_read(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask; + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, l); + + pm_runtime_put_sync(dev); + + return 0; +} + +static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + unsigned int l; + + timer = to_dmtimer(cookie); + if (unlikely(!timer || !atomic_read(&timer->enabled))) { + pr_err("%s: timer not available or enabled.\n", __func__); + return 0; + } + + l = dmtimer_read(timer, timer->irq_stat); + + return l; +} + +static int omap_dm_timer_write_status(struct omap_dm_timer *cookie, unsigned int value) +{ + struct dmtimer *timer; + + timer = to_dmtimer(cookie); + if (unlikely(!timer || !atomic_read(&timer->enabled))) + return -EINVAL; + + __omap_dm_timer_write_status(timer, value); + + return 0; +} + +static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *cookie) +{ + struct dmtimer *timer; + + timer = to_dmtimer(cookie); + if (unlikely(!timer || !atomic_read(&timer->enabled))) { + pr_err("%s: timer not iavailable or enabled.\n", __func__); + return 0; + } + + return __omap_dm_timer_read_counter(timer); +} + +static int omap_dm_timer_write_counter(struct omap_dm_timer *cookie, unsigned int value) +{ + struct dmtimer *timer; + + timer = to_dmtimer(cookie); + if (unlikely(!timer || !atomic_read(&timer->enabled))) { + pr_err("%s: timer not available or enabled.\n", __func__); + return -EINVAL; + } + + dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, value); + + /* Save the context */ + timer->context.tcrr = value; + return 0; +} + +static int __maybe_unused omap_dm_timer_runtime_suspend(struct device *dev) +{ + struct dmtimer *timer = dev_get_drvdata(dev); + + atomic_set(&timer->enabled, 0); + + if (timer->capability & OMAP_TIMER_ALWON || !timer->func_base) + return 0; + + omap_timer_save_context(timer); + + return 0; +} + +static int __maybe_unused omap_dm_timer_runtime_resume(struct device *dev) +{ + struct dmtimer *timer = dev_get_drvdata(dev); + + if (!(timer->capability & OMAP_TIMER_ALWON) && timer->func_base) + omap_timer_restore_context(timer); + + atomic_set(&timer->enabled, 1); + + return 0; +} + +static const struct dev_pm_ops omap_dm_timer_pm_ops = { + SET_RUNTIME_PM_OPS(omap_dm_timer_runtime_suspend, + omap_dm_timer_runtime_resume, NULL) +}; + +static const struct of_device_id omap_timer_match[]; + +/** + * omap_dm_timer_probe - probe function called for every registered device + * @pdev: pointer to current timer platform device + * + * Called by driver framework at the end of device registration for all + * timer devices. + */ +static int omap_dm_timer_probe(struct platform_device *pdev) +{ + unsigned long flags; + struct dmtimer *timer; + struct device *dev = &pdev->dev; + const struct dmtimer_platform_data *pdata; + int ret; + + pdata = of_device_get_match_data(dev); + if (!pdata) + pdata = dev_get_platdata(dev); + else + dev->platform_data = (void *)pdata; + + if (!pdata) { + dev_err(dev, "%s: no platform data.\n", __func__); + return -ENODEV; + } + + timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL); + if (!timer) + return -ENOMEM; + + timer->irq = platform_get_irq(pdev, 0); + if (timer->irq < 0) + return timer->irq; + + timer->io_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(timer->io_base)) + return PTR_ERR(timer->io_base); + + platform_set_drvdata(pdev, timer); + + if (dev->of_node) { + if (of_find_property(dev->of_node, "ti,timer-alwon", NULL)) + timer->capability |= OMAP_TIMER_ALWON; + if (of_find_property(dev->of_node, "ti,timer-dsp", NULL)) + timer->capability |= OMAP_TIMER_HAS_DSP_IRQ; + if (of_find_property(dev->of_node, "ti,timer-pwm", NULL)) + timer->capability |= OMAP_TIMER_HAS_PWM; + if (of_find_property(dev->of_node, "ti,timer-secure", NULL)) + timer->capability |= OMAP_TIMER_SECURE; + } else { + timer->id = pdev->id; + timer->capability = pdata->timer_capability; + timer->reserved = omap_dm_timer_reserved_systimer(timer->id); + } + + timer->omap1 = timer->capability & OMAP_TIMER_NEEDS_RESET; + + /* OMAP1 devices do not yet use the clock framework for dmtimers */ + if (!timer->omap1) { + timer->fclk = devm_clk_get(dev, "fck"); + if (IS_ERR(timer->fclk)) + return PTR_ERR(timer->fclk); + + timer->fclk_nb.notifier_call = omap_timer_fclk_notifier; + ret = devm_clk_notifier_register(dev, timer->fclk, + &timer->fclk_nb); + if (ret) + return ret; + + timer->fclk_rate = clk_get_rate(timer->fclk); + } else { + timer->fclk = ERR_PTR(-ENODEV); + } + + if (!(timer->capability & OMAP_TIMER_ALWON)) { + timer->nb.notifier_call = omap_timer_context_notifier; + cpu_pm_register_notifier(&timer->nb); + } + + timer->errata = pdata->timer_errata; + + timer->pdev = pdev; + + pm_runtime_enable(dev); + + if (!timer->reserved) { + ret = pm_runtime_resume_and_get(dev); + if (ret) { + dev_err(dev, "%s: pm_runtime_get_sync failed!\n", + __func__); + goto err_disable; + } + __omap_dm_timer_init_regs(timer); + pm_runtime_put(dev); + } + + /* add the timer element to the list */ + spin_lock_irqsave(&dm_timer_lock, flags); + list_add_tail(&timer->node, &omap_timer_list); + spin_unlock_irqrestore(&dm_timer_lock, flags); + + dev_dbg(dev, "Device Probed.\n"); + + return 0; + +err_disable: + pm_runtime_disable(dev); + return ret; +} + +/** + * omap_dm_timer_remove - cleanup a registered timer device + * @pdev: pointer to current timer platform device + * + * Called by driver framework whenever a timer device is unregistered. + * In addition to freeing platform resources it also deletes the timer + * entry from the local list. + */ +static int omap_dm_timer_remove(struct platform_device *pdev) +{ + struct dmtimer *timer; + unsigned long flags; + int ret = -EINVAL; + + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry(timer, &omap_timer_list, node) + if (!strcmp(dev_name(&timer->pdev->dev), + dev_name(&pdev->dev))) { + if (!(timer->capability & OMAP_TIMER_ALWON)) + cpu_pm_unregister_notifier(&timer->nb); + list_del(&timer->node); + ret = 0; + break; + } + spin_unlock_irqrestore(&dm_timer_lock, flags); + + pm_runtime_disable(&pdev->dev); + + return ret; +} + +static const struct omap_dm_timer_ops dmtimer_ops = { + .request_by_node = omap_dm_timer_request_by_node, + .request_specific = omap_dm_timer_request_specific, + .request = omap_dm_timer_request, + .set_source = omap_dm_timer_set_source, + .get_irq = omap_dm_timer_get_irq, + .set_int_enable = omap_dm_timer_set_int_enable, + .set_int_disable = omap_dm_timer_set_int_disable, + .free = omap_dm_timer_free, + .enable = omap_dm_timer_enable, + .disable = omap_dm_timer_disable, + .get_fclk = omap_dm_timer_get_fclk, + .start = omap_dm_timer_start, + .stop = omap_dm_timer_stop, + .set_load = omap_dm_timer_set_load, + .set_match = omap_dm_timer_set_match, + .set_pwm = omap_dm_timer_set_pwm, + .get_pwm_status = omap_dm_timer_get_pwm_status, + .set_prescaler = omap_dm_timer_set_prescaler, + .read_counter = omap_dm_timer_read_counter, + .write_counter = omap_dm_timer_write_counter, + .read_status = omap_dm_timer_read_status, + .write_status = omap_dm_timer_write_status, +}; + +static const struct dmtimer_platform_data omap3plus_pdata = { + .timer_errata = OMAP_TIMER_ERRATA_I103_I767, + .timer_ops = &dmtimer_ops, +}; + +static const struct dmtimer_platform_data am6_pdata = { + .timer_ops = &dmtimer_ops, +}; + +static const struct of_device_id omap_timer_match[] = { + { + .compatible = "ti,omap2420-timer", + }, + { + .compatible = "ti,omap3430-timer", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,omap4430-timer", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,omap5430-timer", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,am335x-timer", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,am335x-timer-1ms", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,dm816-timer", + .data = &omap3plus_pdata, + }, + { + .compatible = "ti,am654-timer", + .data = &am6_pdata, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap_timer_match); + +static struct platform_driver omap_dm_timer_driver = { + .probe = omap_dm_timer_probe, + .remove = omap_dm_timer_remove, + .driver = { + .name = "omap_timer", + .of_match_table = omap_timer_match, + .pm = &omap_dm_timer_pm_ops, + }, +}; + +module_platform_driver(omap_dm_timer_driver); + +MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Texas Instruments Inc"); |