diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2014-05-28 09:44:38 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-06-01 22:22:25 +0200 |
| commit | 4f443a8a611d0cb3c40e95e0d90e9d7e4740eda6 (patch) | |
| tree | 04b14006cf7a7d7209dd714af30375b796567f7c /drivers/i2c/busses/i2c-rcar.c | |
| parent | 93e953d3785fa6fc7fda4b64bd38d003f1dcb1d2 (diff) | |
i2c: rcar: refactor bus state machine
Remove the seperate functions and use designated constants. As readable
but less overhead.
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>
Diffstat (limited to 'drivers/i2c/busses/i2c-rcar.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 37 |
1 files changed, 10 insertions, 27 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 5a3e8a12e8d5..eadaca0ef4be 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -79,11 +79,9 @@ #define MATE (1 << 0) /* address sent irq en */ -enum { - RCAR_BUS_PHASE_ADDR, - RCAR_BUS_PHASE_DATA, - RCAR_BUS_PHASE_STOP, -}; +#define RCAR_BUS_PHASE_START (MDBS | MIE | ESG) +#define RCAR_BUS_PHASE_DATA (MDBS | MIE) +#define RCAR_BUS_PHASE_STOP (MDBS | MIE | FSB) enum { RCAR_IRQ_CLOSE, @@ -204,21 +202,6 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) return -EBUSY; } -static void rcar_i2c_bus_phase(struct rcar_i2c_priv *priv, int phase) -{ - switch (phase) { - case RCAR_BUS_PHASE_ADDR: - rcar_i2c_write(priv, ICMCR, MDBS | MIE | ESG); - break; - case RCAR_BUS_PHASE_DATA: - rcar_i2c_write(priv, ICMCR, MDBS | MIE); - break; - case RCAR_BUS_PHASE_STOP: - rcar_i2c_write(priv, ICMCR, MDBS | MIE | FSB); - break; - } -} - /* * clock function */ @@ -328,7 +311,7 @@ static int rcar_i2c_recv(struct rcar_i2c_priv *priv) { rcar_i2c_set_addr(priv, 1); rcar_i2c_status_clear(priv); - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_ADDR); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_RECV); return 0; @@ -347,7 +330,7 @@ static int rcar_i2c_send(struct rcar_i2c_priv *priv) rcar_i2c_set_addr(priv, 0); rcar_i2c_status_clear(priv); - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_ADDR); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_SEND); return 0; @@ -376,7 +359,7 @@ static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) * goto data phase. */ if (msr & MAT) - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_DATA); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA); if (priv->pos < msg->len) { /* @@ -404,7 +387,7 @@ static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) * prepare stop condition here. * ID_DONE will be set on STOP irq. */ - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); else /* * If current msg is _NOT_ last msg, @@ -452,9 +435,9 @@ static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) * otherwise, go to DATA phase. */ if (priv->pos + 1 >= msg->len) - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); else - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_DATA); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA); rcar_i2c_recv_restart(priv); @@ -502,7 +485,7 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr) dev_dbg(dev, "Nack\n"); /* go to stop phase */ - rcar_i2c_bus_phase(priv, RCAR_BUS_PHASE_STOP); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); rcar_i2c_irq_mask(priv, RCAR_IRQ_OPEN_FOR_STOP); rcar_i2c_flags_set(priv, ID_NACK); goto out; |