clocksource: sh_mtu2: Add memory base to sh_mtu2_channel structure

The channel memory base is channel-specific, add it to the channel
structure in preparation for support of multiple channels per device.

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

1 files changed, 18 insertions, 14 deletions

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 2fe3ab4c3231..97714ce5e851 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -38,7 +38,10 @@ struct sh_mtu2_device;
 
 struct sh_mtu2_channel {
         struct sh_mtu2_device *mtu;
+
+        void __iomem *base;
         int irq;
+
         struct clock_event_device ced;
 };
 
@@ -74,39 +77,35 @@ static unsigned long mtu2_reg_offs[] = {
 
 static inline unsigned long sh_mtu2_read(struct sh_mtu2_channel *ch, int reg_nr)
 {
-        struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data;
-        void __iomem *base = ch->mtu->mapbase;
         unsigned long offs;
 
         if (reg_nr == TSTR)
-                return ioread8(base + cfg->channel_offset);
+                return ioread8(ch->mtu->mapbase);
 
         offs = mtu2_reg_offs[reg_nr];
 
         if ((reg_nr == TCNT) || (reg_nr == TGR))
-                return ioread16(base + offs);
+                return ioread16(ch->base + offs);
         else
-                return ioread8(base + offs);
+                return ioread8(ch->base + offs);
 }
 
 static inline void sh_mtu2_write(struct sh_mtu2_channel *ch, int reg_nr,
                                 unsigned long value)
 {
-        struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data;
-        void __iomem *base = ch->mtu->mapbase;
         unsigned long offs;
 
         if (reg_nr == TSTR) {
-                iowrite8(value, base + cfg->channel_offset);
+                iowrite8(value, ch->mtu->mapbase);
                 return;
         }
 
         offs = mtu2_reg_offs[reg_nr];
 
         if ((reg_nr == TCNT) || (reg_nr == TGR))
-                iowrite16(value, base + offs);
+                iowrite16(value, ch->base + offs);
         else
-                iowrite8(value, base + offs);
+                iowrite8(value, ch->base + offs);
 }
 
 static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
@@ -315,13 +314,18 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
                 goto err0;
         }
 
-        /* map memory, let mapbase point to our channel */
-        mtu->mapbase = ioremap_nocache(res->start, resource_size(res));
-        if (mtu->mapbase == NULL) {
+        /*
+         * Map memory, let channel.base point to our channel and mapbase to the
+         * start/stop shared register.
+         */
+        mtu->channel.base = ioremap_nocache(res->start, resource_size(res));
+        if (mtu->channel.base == NULL) {
                 dev_err(&mtu->pdev->dev, "failed to remap I/O memory\n");
                 goto err0;
         }
 
+        mtu->mapbase = mtu->channel.base + cfg->channel_offset;
+
         /* get hold of clock */
         mtu->clk = clk_get(&mtu->pdev->dev, "mtu2_fck");
         if (IS_ERR(mtu->clk)) {
@@ -344,7 +348,7 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
  err2:
         clk_put(mtu->clk);
  err1:
-        iounmap(mtu->mapbase);
+        iounmap(mtu->channel.base);
  err0:
         return ret;
 }