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i3c: dw: Create a generic fifo read function

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In a future change we'll want to read from the IBI FIFO too, so turn
dw_i3c_read_rx_fifo() into a generic read with the FIFO register as a
parameter.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/827204789583dd86addffb47ecaeab9d67cf95d5.1680161823.git.jk@codeconstruct.com.au
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Jeremy Kerr 2023-03-30 15:50:32 +08:00 committed by Alexandre Belloni
parent 7dc2e0a875
commit 79f42b31c2
1 changed files with 10 additions and 4 deletions
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14
drivers/i3c/master/dw-i3c-master.c
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@ -318,18 +318,24 @@ static void dw_i3c_master_wr_tx_fifo(struct dw_i3c_master *master,
}
}
static void dw_i3c_master_read_rx_fifo(struct dw_i3c_master *master,
u8 *bytes, int nbytes)
static void dw_i3c_master_read_fifo(struct dw_i3c_master *master,
int reg, u8 *bytes, int nbytes)
{
readsl(master->regs + RX_TX_DATA_PORT, bytes, nbytes / 4);
readsl(master->regs + reg, bytes, nbytes / 4);
if (nbytes & 3) {
u32 tmp;
readsl(master->regs + RX_TX_DATA_PORT, &tmp, 1);
readsl(master->regs + reg, &tmp, 1);
memcpy(bytes + (nbytes & ~3), &tmp, nbytes & 3);
}
}
static void dw_i3c_master_read_rx_fifo(struct dw_i3c_master *master,
u8 *bytes, int nbytes)
{
return dw_i3c_master_read_fifo(master, RX_TX_DATA_PORT, bytes, nbytes);
}
static struct dw_i3c_xfer *
dw_i3c_master_alloc_xfer(struct dw_i3c_master *master, unsigned int ncmds)
{