clocksource: sh_mtu2: Split channel fields from sh_mtu2_priv

Create a new sh_mtu2_channel structure to hold the channel-specific
fields in preparation for multiple channels per device support.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Wolfram Sang <wsa@sang-engineering.com>

1 files changed, 69 insertions, 56 deletions

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 66684552fcc9..e509f417ef64 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -34,12 +34,21 @@
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
 
+struct sh_mtu2_priv;
+
+struct sh_mtu2_channel {
+        struct sh_mtu2_priv *mtu;
+        int irq;
+        struct clock_event_device ced;
+};
+
 struct sh_mtu2_priv {
+        struct platform_device *pdev;
+
         void __iomem *mapbase;
         struct clk *clk;
-        int irq;
-        struct platform_device *pdev;
-        struct clock_event_device ced;
+
+        struct sh_mtu2_channel channel;
 };
 
 static DEFINE_RAW_SPINLOCK(sh_mtu2_lock);
@@ -63,10 +72,10 @@ static unsigned long mtu2_reg_offs[] = {
         [TGR] = 8,
 };
 
-static inline unsigned long sh_mtu2_read(struct sh_mtu2_priv *p, int reg_nr)
+static inline unsigned long sh_mtu2_read(struct sh_mtu2_channel *ch, int reg_nr)
 {
-        struct sh_timer_config *cfg = p->pdev->dev.platform_data;
-        void __iomem *base = p->mapbase;
+        struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data;
+        void __iomem *base = ch->mtu->mapbase;
         unsigned long offs;
 
         if (reg_nr == TSTR)
@@ -80,11 +89,11 @@ static inline unsigned long sh_mtu2_read(struct sh_mtu2_priv *p, int reg_nr)
                 return ioread8(base + offs);
 }
 
-static inline void sh_mtu2_write(struct sh_mtu2_priv *p, int reg_nr,
+static inline void sh_mtu2_write(struct sh_mtu2_channel *ch, int reg_nr,
                                 unsigned long value)
 {
-        struct sh_timer_config *cfg = p->pdev->dev.platform_data;
-        void __iomem *base = p->mapbase;
+        struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data;
+        void __iomem *base = ch->mtu->mapbase;
         unsigned long offs;
 
         if (reg_nr == TSTR) {
@@ -100,100 +109,100 @@ static inline void sh_mtu2_write(struct sh_mtu2_priv *p, int reg_nr,
                 iowrite8(value, base + offs);
 }
 
-static void sh_mtu2_start_stop_ch(struct sh_mtu2_priv *p, int start)
+static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
 {
-        struct sh_timer_config *cfg = p->pdev->dev.platform_data;
+        struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data;
         unsigned long flags, value;
 
         /* start stop register shared by multiple timer channels */
         raw_spin_lock_irqsave(&sh_mtu2_lock, flags);
-        value = sh_mtu2_read(p, TSTR);
+        value = sh_mtu2_read(ch, TSTR);
 
         if (start)
                 value |= 1 << cfg->timer_bit;
         else
                 value &= ~(1 << cfg->timer_bit);
 
-        sh_mtu2_write(p, TSTR, value);
+        sh_mtu2_write(ch, TSTR, value);
         raw_spin_unlock_irqrestore(&sh_mtu2_lock, flags);
 }
 
-static int sh_mtu2_enable(struct sh_mtu2_priv *p)
+static int sh_mtu2_enable(struct sh_mtu2_channel *ch)
 {
         unsigned long periodic;
         unsigned long rate;
         int ret;
 
-        pm_runtime_get_sync(&p->pdev->dev);
-        dev_pm_syscore_device(&p->pdev->dev, true);
+        pm_runtime_get_sync(&ch->mtu->pdev->dev);
+        dev_pm_syscore_device(&ch->mtu->pdev->dev, true);
 
         /* enable clock */
-        ret = clk_enable(p->clk);
+        ret = clk_enable(ch->mtu->clk);
         if (ret) {
-                dev_err(&p->pdev->dev, "cannot enable clock\n");
+                dev_err(&ch->mtu->pdev->dev, "cannot enable clock\n");
                 return ret;
         }
 
         /* make sure channel is disabled */
-        sh_mtu2_start_stop_ch(p, 0);
+        sh_mtu2_start_stop_ch(ch, 0);
 
-        rate = clk_get_rate(p->clk) / 64;
+        rate = clk_get_rate(ch->mtu->clk) / 64;
         periodic = (rate + HZ/2) / HZ;
 
         /* "Periodic Counter Operation" */
-        sh_mtu2_write(p, TCR, 0x23); /* TGRA clear, divide clock by 64 */
-        sh_mtu2_write(p, TIOR, 0);
-        sh_mtu2_write(p, TGR, periodic);
-        sh_mtu2_write(p, TCNT, 0);
-        sh_mtu2_write(p, TMDR, 0);
-        sh_mtu2_write(p, TIER, 0x01);
+        sh_mtu2_write(ch, TCR, 0x23); /* TGRA clear, divide clock by 64 */
+        sh_mtu2_write(ch, TIOR, 0);
+        sh_mtu2_write(ch, TGR, periodic);
+        sh_mtu2_write(ch, TCNT, 0);
+        sh_mtu2_write(ch, TMDR, 0);
+        sh_mtu2_write(ch, TIER, 0x01);
 
         /* enable channel */
-        sh_mtu2_start_stop_ch(p, 1);
+        sh_mtu2_start_stop_ch(ch, 1);
 
         return 0;
 }
 
-static void sh_mtu2_disable(struct sh_mtu2_priv *p)
+static void sh_mtu2_disable(struct sh_mtu2_channel *ch)
 {
         /* disable channel */
-        sh_mtu2_start_stop_ch(p, 0);
+        sh_mtu2_start_stop_ch(ch, 0);
 
         /* stop clock */
-        clk_disable(p->clk);
+        clk_disable(ch->mtu->clk);
 
-        dev_pm_syscore_device(&p->pdev->dev, false);
-        pm_runtime_put(&p->pdev->dev);
+        dev_pm_syscore_device(&ch->mtu->pdev->dev, false);
+        pm_runtime_put(&ch->mtu->pdev->dev);
 }
 
 static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
 {
-        struct sh_mtu2_priv *p = dev_id;
+        struct sh_mtu2_channel *ch = dev_id;
 
         /* acknowledge interrupt */
-        sh_mtu2_read(p, TSR);
-        sh_mtu2_write(p, TSR, 0xfe);
+        sh_mtu2_read(ch, TSR);
+        sh_mtu2_write(ch, TSR, 0xfe);
 
         /* notify clockevent layer */
-        p->ced.event_handler(&p->ced);
+        ch->ced.event_handler(&ch->ced);
         return IRQ_HANDLED;
 }
 
-static struct sh_mtu2_priv *ced_to_sh_mtu2(struct clock_event_device *ced)
+static struct sh_mtu2_channel *ced_to_sh_mtu2(struct clock_event_device *ced)
 {
-        return container_of(ced, struct sh_mtu2_priv, ced);
+        return container_of(ced, struct sh_mtu2_channel, ced);
 }
 
 static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
                                     struct clock_event_device *ced)
 {
-        struct sh_mtu2_priv *p = ced_to_sh_mtu2(ced);
+        struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
         int disabled = 0;
 
         /* deal with old setting first */
         switch (ced->mode) {
         case CLOCK_EVT_MODE_PERIODIC:
-                sh_mtu2_disable(p);
+                sh_mtu2_disable(ch);
                 disabled = 1;
                 break;
         default:
@@ -202,12 +211,13 @@ static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
 
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
-                dev_info(&p->pdev->dev, "used for periodic clock events\n");
-                sh_mtu2_enable(p);
+                dev_info(&ch->mtu->pdev->dev,
+                         "used for periodic clock events\n");
+                sh_mtu2_enable(ch);
                 break;
         case CLOCK_EVT_MODE_UNUSED:
                 if (!disabled)
-                        sh_mtu2_disable(p);
+                        sh_mtu2_disable(ch);
                 break;
         case CLOCK_EVT_MODE_SHUTDOWN:
         default:
@@ -217,18 +227,18 @@ static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
 
 static void sh_mtu2_clock_event_suspend(struct clock_event_device *ced)
 {
-        pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->pdev->dev);
+        pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
 }
 
 static void sh_mtu2_clock_event_resume(struct clock_event_device *ced)
 {
-        pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->pdev->dev);
+        pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
 }
 
-static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
+static void sh_mtu2_register_clockevent(struct sh_mtu2_channel *ch,
                                        char *name, unsigned long rating)
 {
-        struct clock_event_device *ced = &p->ced;
+        struct clock_event_device *ced = &ch->ced;
         int ret;
 
         memset(ced, 0, sizeof(*ced));
@@ -241,23 +251,24 @@ static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
         ced->suspend = sh_mtu2_clock_event_suspend;
         ced->resume = sh_mtu2_clock_event_resume;
 
-        dev_info(&p->pdev->dev, "used for clock events\n");
+        dev_info(&ch->mtu->pdev->dev, "used for clock events\n");
         clockevents_register_device(ced);
 
-        ret = request_irq(p->irq, sh_mtu2_interrupt,
+        ret = request_irq(ch->irq, sh_mtu2_interrupt,
                           IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
-                          dev_name(&p->pdev->dev), p);
+                          dev_name(&ch->mtu->pdev->dev), ch);
         if (ret) {
-                dev_err(&p->pdev->dev, "failed to request irq %d\n", p->irq);
+                dev_err(&ch->mtu->pdev->dev, "failed to request irq %d\n",
+                        ch->irq);
                 return;
         }
 }
 
-static int sh_mtu2_register(struct sh_mtu2_priv *p, char *name,
+static int sh_mtu2_register(struct sh_mtu2_channel *ch, char *name,
                             unsigned long clockevent_rating)
 {
         if (clockevent_rating)
-                sh_mtu2_register_clockevent(p, name, clockevent_rating);
+                sh_mtu2_register_clockevent(ch, name, clockevent_rating);
 
         return 0;
 }
@@ -285,8 +296,8 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
                 goto err0;
         }
 
-        p->irq = platform_get_irq(p->pdev, 0);
-        if (p->irq < 0) {
+        p->channel.irq = platform_get_irq(p->pdev, 0);
+        if (p->channel.irq < 0) {
                 dev_err(&p->pdev->dev, "failed to get irq\n");
                 goto err0;
         }
@@ -310,7 +321,9 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
         if (ret < 0)
                 goto err2;
 
-        ret = sh_mtu2_register(p, (char *)dev_name(&p->pdev->dev),
+        p->channel.mtu = p;
+
+        ret = sh_mtu2_register(&p->channel, (char *)dev_name(&p->pdev->dev),
                                cfg->clockevent_rating);
         if (ret < 0)
                 goto err3;