* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#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_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 omap_dm_timer;
-
struct timer_regs {
u32 tidr;
- u32 tistat;
- u32 tisr;
u32 tier;
u32 twer;
u32 tclr;
u32 towr;
};
-struct dmtimer_platform_data {
- /* set_timer_src - Only used for OMAP1 devices */
- int (*set_timer_src)(struct platform_device *pdev, int source);
- u32 timer_capability;
+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);
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_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);
#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 id;
- int irq;
- struct clk *fclk;
-
- void __iomem *io_base;
- void __iomem *sys_stat; /* TISTAT timer status */
- 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;
- struct platform_device *pdev;
- struct list_head node;
-};
-
-int omap_dm_timer_prepare(struct omap_dm_timer *timer);
-
static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
int posted)
{
tidr = __raw_readl(timer->io_base);
if (!(tidr >> 16)) {
timer->revision = 1;
- timer->sys_stat = timer->io_base +
- OMAP_TIMER_V1_SYS_STAT_OFFSET;
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 = NULL;
+ 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->sys_stat = NULL;
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;
}
}
-/* Assumes the source clock has been set by caller */
-static inline void __omap_dm_timer_reset(struct omap_dm_timer *timer,
- int autoidle, int wakeup)
+/*
+ * __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)
{
- u32 l;
+ if (timer->posted)
+ return;
- l = __raw_readl(timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
- l |= 0x02 << 3; /* Set to smart-idle mode */
- l |= 0x2 << 8; /* Set clock activity to perserve f-clock on idle */
+ if (timer->errata & OMAP_TIMER_ERRATA_I103_I767)
+ return;
- if (autoidle)
- l |= 0x1 << 0;
-
- if (wakeup)
- l |= 1 << 2;
-
- __raw_writel(l, timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
-
- /* Match hardware reset default of posted mode */
__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
- OMAP_TIMER_CTRL_POSTED, 0);
+ OMAP_TIMER_CTRL_POSTED, 0);
+ timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+ timer->posted = OMAP_TIMER_POSTED;
}
-static inline int __omap_dm_timer_set_source(struct clk *timer_fck,
- struct clk *parent)
+/**
+ * __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)
{
- 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;
+ timer->errata &= ~errata;
}
static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
projects / firefly-linux-kernel-4.4.55.git / blobdiff