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spi: kirkwood_spi.c: Prepare for driver model support

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This patch prepares the Kirkwood SPI driver, also used on the MVEBU board
(Armada XP / 38x), for the conversion to driver model.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Valentin Longchamp <valentin.longchamp@keymile.com>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Jagan Teki <jteki@openedev.com>
Cc: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stefan Roese 2015-11-20 08:44:21 +01:00
parent 6451223a8d
commit 18dd3b2221
1 changed files with 28 additions and 13 deletions
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41
drivers/spi/kirkwood_spi.c
View file

@ -145,33 +145,42 @@ void spi_init(void)
{
}
static void _spi_cs_activate(struct kwspi_registers *reg)
{
setbits_le32(&reg->ctrl, KWSPI_CSN_ACT);
}
static void _spi_cs_deactivate(struct kwspi_registers *reg)
{
clrbits_le32(&reg->ctrl, KWSPI_CSN_ACT);
}
void spi_cs_activate(struct spi_slave *slave)
{
setbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
_spi_cs_activate(spireg);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
clrbits_le32(&spireg->ctrl, KWSPI_CSN_ACT);
_spi_cs_deactivate(spireg);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
unsigned int tmpdout, tmpdin;
int tm, isread = 0;
debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
slave->bus, slave->cs, dout, din, bitlen);
debug("spi_xfer: dout %p din %p bitlen %u\n", dout, din, bitlen);
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave);
_spi_cs_activate(reg);
/*
* handle data in 8-bit chunks
* TBD: 2byte xfer mode to be enabled
*/
clrsetbits_le32(&spireg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE);
clrsetbits_le32(&reg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE);
while (bitlen > 4) {
debug("loopstart bitlen %d\n", bitlen);
@ -181,8 +190,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
if (dout)
tmpdout = *(u32 *)dout & 0xff;
clrbits_le32(&spireg->irq_cause, KWSPI_SMEMRDIRQ);
writel(tmpdout, &spireg->dout); /* Write the data out */
clrbits_le32(&reg->irq_cause, KWSPI_SMEMRDIRQ);
writel(tmpdout, &reg->dout); /* Write the data out */
debug("*** spi_xfer: ... %08x written, bitlen %d\n",
tmpdout, bitlen);
@ -192,9 +201,9 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
* The NE event must be read and cleared first
*/
for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) {
if (readl(&reg->irq_cause) & KWSPI_SMEMRDIRQ) {
isread = 1;
tmpdin = readl(&spireg->din);
tmpdin = readl(&reg->din);
debug("spi_xfer: din %p..%08x read\n",
din, tmpdin);
@ -216,7 +225,13 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
}
if (flags & SPI_XFER_END)
spi_cs_deactivate(slave);
_spi_cs_deactivate(reg);
return 0;
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
return _spi_xfer(spireg, bitlen, dout, din, flags);
}