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i2c: rcar: refactor irq state machine 

Remove the seperate functions and use designated constants. As readable
but less overhead. Actually, this is even more readable since the old
function used a mix of "=" and "|=".

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2014-05-28 09:44:39 +02:00 коммит произвёл Wolfram Sang
Родитель 4f443a8a61
Коммит f2382249b2
1 изменённых файлов: 7 добавлений и 32 удалений
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39
drivers/i2c/busses/i2c-rcar.c
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@ -83,12 +83,9 @@
#define RCAR_BUS_PHASE_DATA (MDBS | MIE)
#define RCAR_BUS_PHASE_STOP (MDBS | MIE | FSB)
enum {
RCAR_IRQ_CLOSE,
RCAR_IRQ_OPEN_FOR_SEND,
RCAR_IRQ_OPEN_FOR_RECV,
RCAR_IRQ_OPEN_FOR_STOP,
};
#define RCAR_IRQ_SEND (MNRE | MALE | MSTE | MATE | MDEE)
#define RCAR_IRQ_RECV (MNRE | MALE | MSTE | MATE | MDRE)
#define RCAR_IRQ_STOP (MSTE)
/*
* flags
@ -158,28 +155,6 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
rcar_i2c_write(priv, ICMAR, 0);
}
static void rcar_i2c_irq_mask(struct rcar_i2c_priv *priv, int open)
{
u32 val = MNRE | MALE | MSTE | MATE; /* default */
switch (open) {
case RCAR_IRQ_OPEN_FOR_SEND:
val |= MDEE; /* default + send */
break;
case RCAR_IRQ_OPEN_FOR_RECV:
val |= MDRE; /* default + read */
break;
case RCAR_IRQ_OPEN_FOR_STOP:
val = MSTE; /* stop irq only */
break;
case RCAR_IRQ_CLOSE:
default:
val = 0; /* all close */
break;
}
rcar_i2c_write(priv, ICMIER, val);
}
static void rcar_i2c_set_addr(struct rcar_i2c_priv *priv, u32 recv)
{
rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | recv);
@ -312,7 +287,7 @@ static int rcar_i2c_recv(struct rcar_i2c_priv *priv)
rcar_i2c_set_addr(priv, 1);
rcar_i2c_status_clear(priv);
rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_RECV);
rcar_i2c_write(priv, ICMIER, RCAR_IRQ_RECV);
return 0;
}
@ -331,7 +306,7 @@ static int rcar_i2c_send(struct rcar_i2c_priv *priv)
rcar_i2c_set_addr(priv, 0);
rcar_i2c_status_clear(priv);
rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_SEND);
rcar_i2c_write(priv, ICMIER, RCAR_IRQ_SEND);
return 0;
}
@ -486,7 +461,7 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
/* go to stop phase */
rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);
rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_STOP);
rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP);
rcar_i2c_flags_set(priv, ID_NACK);
goto out;
}
@ -501,7 +476,7 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
out:
if (rcar_i2c_flags_has(priv, ID_DONE)) {
rcar_i2c_irq_mask(priv, RCAR_IRQ_CLOSE);
rcar_i2c_write(priv, ICMIER, 0);
rcar_i2c_status_clear(priv);
wake_up(&priv->wait);
}