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spi: octeon: Put register offsets into a struct 

Instead of hard-coding the register offsets put them into a struct
and set them in the probe function.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Tested-by: Steven J. Hill <steven.hill@cavium.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jan Glauber 2016-07-23 12:42:52 +02:00 committed by Mark Brown
parent b9e64763b6
commit ee423c5322
1 changed files with 27 additions and 14 deletions
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41
drivers/spi/spi-octeon.c
View File

@ -17,22 +17,30 @@
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-mpi-defs.h>
#define OCTEON_SPI_CFG 0
#define OCTEON_SPI_STS 0x08
#define OCTEON_SPI_TX 0x10
#define OCTEON_SPI_DAT0 0x80
#define OCTEON_SPI_MAX_BYTES 9
#define OCTEON_SPI_MAX_CLOCK_HZ 16000000
struct octeon_spi_regs {
int config;
int status;
int tx;
int data;
};
struct octeon_spi {
void __iomem *register_base;
u64 last_cfg;
u64 cs_enax;
int sys_freq;
struct octeon_spi_regs regs;
};
#define OCTEON_SPI_CFG(x) (x->regs.config)
#define OCTEON_SPI_STS(x) (x->regs.status)
#define OCTEON_SPI_TX(x) (x->regs.tx)
#define OCTEON_SPI_DAT0(x) (x->regs.data)
static void octeon_spi_wait_ready(struct octeon_spi *p)
{
union cvmx_mpi_sts mpi_sts;
@ -41,7 +49,7 @@ static void octeon_spi_wait_ready(struct octeon_spi *p)
do {
if (loops++)
__delay(500);
mpi_sts.u64 = readq(p->register_base + OCTEON_SPI_STS);
mpi_sts.u64 = readq(p->register_base + OCTEON_SPI_STS(p));
} while (mpi_sts.s.busy);
}
@ -83,7 +91,7 @@ static int octeon_spi_do_transfer(struct octeon_spi *p,
if (mpi_cfg.u64 != p->last_cfg) {
p->last_cfg = mpi_cfg.u64;
writeq(mpi_cfg.u64, p->register_base + OCTEON_SPI_CFG);
writeq(mpi_cfg.u64, p->register_base + OCTEON_SPI_CFG(p));
}
tx_buf = xfer->tx_buf;
rx_buf = xfer->rx_buf;
@ -95,19 +103,19 @@ static int octeon_spi_do_transfer(struct octeon_spi *p,
d = *tx_buf++;
else
d = 0;
writeq(d, p->register_base + OCTEON_SPI_DAT0 + (8 * i));
writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
}
mpi_tx.u64 = 0;
mpi_tx.s.csid = spi->chip_select;
mpi_tx.s.leavecs = 1;
mpi_tx.s.txnum = tx_buf ? OCTEON_SPI_MAX_BYTES : 0;
mpi_tx.s.totnum = OCTEON_SPI_MAX_BYTES;
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX);
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p));
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) {
u64 v = readq(p->register_base + OCTEON_SPI_DAT0 + (8 * i));
u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
*rx_buf++ = (u8)v;
}
len -= OCTEON_SPI_MAX_BYTES;
@ -119,7 +127,7 @@ static int octeon_spi_do_transfer(struct octeon_spi *p,
d = *tx_buf++;
else
d = 0;
writeq(d, p->register_base + OCTEON_SPI_DAT0 + (8 * i));
writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
}
mpi_tx.u64 = 0;
@ -130,12 +138,12 @@ static int octeon_spi_do_transfer(struct octeon_spi *p,
mpi_tx.s.leavecs = !xfer->cs_change;
mpi_tx.s.txnum = tx_buf ? len : 0;
mpi_tx.s.totnum = len;
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX);
writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p));
octeon_spi_wait_ready(p);
if (rx_buf)
for (i = 0; i < len; i++) {
u64 v = readq(p->register_base + OCTEON_SPI_DAT0 + (8 * i));
u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i));
*rx_buf++ = (u8)v;
}
@ -194,6 +202,11 @@ static int octeon_spi_probe(struct platform_device *pdev)
p->register_base = reg_base;
p->sys_freq = octeon_get_io_clock_rate();
p->regs.config = 0;
p->regs.status = 0x08;
p->regs.tx = 0x10;
p->regs.data = 0x80;
master->num_chipselect = 4;
master->mode_bits = SPI_CPHA |
SPI_CPOL |
@ -226,7 +239,7 @@ static int octeon_spi_remove(struct platform_device *pdev)
struct octeon_spi *p = spi_master_get_devdata(master);
/* Clear the CSENA* and put everything in a known state. */
writeq(0, p->register_base + OCTEON_SPI_CFG);
writeq(0, p->register_base + OCTEON_SPI_CFG(p));
return 0;
}