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Code Issues Releases Activity

- Remove unnecessary register writes in activate_device

Browse Source 
and deactivate_device
- Save state before attaching driver and restore it when
    detaching
- Clear CLK bit after last bit of byte has been sent over
    the bus providing falling edge for last byte in transfer
- Fix several places where CS0 was always assumed
- Add $FreeBSD$ to ar71xxreg.h
This commit is contained in:
Oleksandr Tymoshenko 2010-01-21 00:15:59 +00:00
parent b485a59508
commit 9e3ed0a7fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=202723
2 changed files with 31 additions and 18 deletions
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45
sys/mips/atheros/ar71xx_spi.c
View File

@ -77,7 +77,7 @@ __FBSDID("$FreeBSD$");
struct ar71xx_spi_softc {
device_t sc_dev;
struct resource *sc_mem_res;
uint32_t sc_reg_ioctrl;
uint32_t sc_reg_ctrl;
};
static int
@ -102,12 +102,11 @@ ar71xx_spi_attach(device_t dev)
return (ENXIO);
}
sc->sc_reg_ioctrl = SPI_READ(sc, AR71XX_SPI_IO_CTRL);
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, SPI_IO_CTRL_CS0 | SPI_IO_CTRL_CS1 |
SPI_IO_CTRL_CS2);
SPI_WRITE(sc, AR71XX_SPI_CTRL, sc->sc_reg_ioctrl);
SPI_WRITE(sc, AR71XX_SPI_FS, 0);
SPI_WRITE(sc, AR71XX_SPI_FS, 1);
sc->sc_reg_ctrl = SPI_READ(sc, AR71XX_SPI_CTRL);
SPI_WRITE(sc, AR71XX_SPI_CTRL, 0x43);
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, SPI_IO_CTRL_CSMASK);
device_add_child(dev, "spibus", 0);
return (bus_generic_attach(dev));
@ -116,14 +115,12 @@ ar71xx_spi_attach(device_t dev)
static void
ar71xx_spi_chip_activate(struct ar71xx_spi_softc *sc, int cs)
{
uint32_t ioctrl = SPI_IO_CTRL_CS0 |SPI_IO_CTRL_CS1 | SPI_IO_CTRL_CS2;
uint32_t ioctrl = SPI_IO_CTRL_CSMASK;
/*
* Put respective CSx to low
*/
ioctrl &= ~(SPI_IO_CTRL_CS0 << cs);
SPI_WRITE(sc, AR71XX_SPI_FS, 1);
SPI_WRITE(sc, AR71XX_SPI_CTRL, 0x43);
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, ioctrl);
}
@ -133,18 +130,19 @@ ar71xx_spi_chip_deactivate(struct ar71xx_spi_softc *sc, int cs)
/*
* Put all CSx to high
*/
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, SPI_IO_CTRL_CS0 | SPI_IO_CTRL_CS1 |
SPI_IO_CTRL_CS2);
SPI_WRITE(sc, AR71XX_SPI_CTRL, sc->sc_reg_ioctrl);
SPI_WRITE(sc, AR71XX_SPI_FS, 0);
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, SPI_IO_CTRL_CSMASK);
}
static uint8_t
ar71xx_spi_txrx(struct ar71xx_spi_softc *sc, uint8_t data)
ar71xx_spi_txrx(struct ar71xx_spi_softc *sc, int cs, uint8_t data)
{
int bit;
/* CS0 */
uint32_t ioctrl = SPI_IO_CTRL_CS1 | SPI_IO_CTRL_CS2;
uint32_t ioctrl = SPI_IO_CTRL_CSMASK;
/*
* low-level for selected CS
*/
ioctrl &= ~(SPI_IO_CTRL_CS0 << cs);
uint32_t iod, rds;
for (bit = 7; bit >=0; bit--) {
@ -156,6 +154,10 @@ ar71xx_spi_txrx(struct ar71xx_spi_softc *sc, uint8_t data)
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, iod | SPI_IO_CTRL_CLK);
}
/*
* Provide falling edge for connected device by clear clock bit.
*/
SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, iod);
rds = SPI_READ(sc, AR71XX_SPI_RDS);
return (rds & 0xff);
@ -184,7 +186,7 @@ ar71xx_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
buf_out = (uint8_t *)cmd->tx_cmd;
buf_in = (uint8_t *)cmd->rx_cmd;
for (i = 0; i < cmd->tx_cmd_sz; i++)
buf_in[i] = ar71xx_spi_txrx(sc, buf_out[i]);
buf_in[i] = ar71xx_spi_txrx(sc, devi->cs, buf_out[i]);
/*
* Receive/transmit data (depends on command)
@ -192,7 +194,7 @@ ar71xx_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
buf_out = (uint8_t *)cmd->tx_data;
buf_in = (uint8_t *)cmd->rx_data;
for (i = 0; i < cmd->tx_data_sz; i++)
buf_in[i] = ar71xx_spi_txrx(sc, buf_out[i]);
buf_in[i] = ar71xx_spi_txrx(sc, devi->cs, buf_out[i]);
ar71xx_spi_chip_deactivate(sc, devi->cs);
@ -202,8 +204,15 @@ ar71xx_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
static int
ar71xx_spi_detach(device_t dev)
{
struct ar71xx_spi_softc *sc = device_get_softc(dev);
return (EBUSY); /* XXX */
SPI_WRITE(sc, AR71XX_SPI_CTRL, sc->sc_reg_ctrl);
SPI_WRITE(sc, AR71XX_SPI_FS, 0);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
return (0);
}
static device_method_t ar71xx_spi_methods[] = {

4
sys/mips/atheros/ar71xxreg.h
View File

@ -23,6 +23,9 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* $FreeBSD$ */
#ifndef _AR71XX_REG_H_
#define _AR71XX_REG_H_
@ -422,6 +425,7 @@
#define SPI_IO_CTRL_CS2 (1 << 18)
#define SPI_IO_CTRL_CS1 (1 << 17)
#define SPI_IO_CTRL_CS0 (1 << 16)
#define SPI_IO_CTRL_CSMASK (7 << 16)
#define SPI_IO_CTRL_CLK (1 << 8)
#define SPI_IO_CTRL_DO 1
#define AR71XX_SPI_RDS 0x0C