summaryrefslogtreecommitdiffstats
path: root/drivers/clocksource/timer-ti-dm.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clocksource/timer-ti-dm.c')
-rw-r--r--drivers/clocksource/timer-ti-dm.c1290
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");