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spi: mpc8xxx: Convert to DM 

Support DM in the MPC8xxx SPI driver, and remove the legacy SPI
interface.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Jagan Teki 2019-04-29 01:58:53 +05:30
parent 67adbaef5a
commit c1a3f1ee18
2 changed files with 116 additions and 46 deletions
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10
drivers/spi/Kconfig
View File

@ -131,6 +131,11 @@ config MPC8XX_SPI
help help
Enable support for SPI on MPC8XX Enable support for SPI on MPC8XX
config MPC8XXX_SPI
bool "MPC8XXX SPI Driver"
help
Enable support for SPI on the MPC8XXX PowerPC SoCs.
config MT7621_SPI config MT7621_SPI
bool "MediaTek MT7621 SPI driver" bool "MediaTek MT7621 SPI driver"
depends on SOC_MT7628 depends on SOC_MT7628
@ -364,11 +369,6 @@ config LPC32XX_SSP
help help
Enable support for SPI on LPC32xx Enable support for SPI on LPC32xx
config MPC8XXX_SPI
bool "MPC8XXX SPI Driver"
help
Enable support for SPI on the MPC8XXX PowerPC SoCs.
config MXC_SPI config MXC_SPI
bool "MXC SPI Driver" bool "MXC SPI Driver"
help help

152
drivers/spi/mpc8xxx_spi.c
View File

@ -5,10 +5,12 @@
*/ */
#include <common.h> #include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h> #include <malloc.h>
#include <spi.h> #include <spi.h>
#include <asm/mpc8xxx_spi.h> #include <asm/mpc8xxx_spi.h>
#include <asm-generic/gpio.h>
enum { enum {
SPI_EV_NE = BIT(31 - 22), /* Receiver Not Empty */ SPI_EV_NE = BIT(31 - 22), /* Receiver Not Empty */
@ -30,6 +32,12 @@ enum {
SPI_COM_LST = BIT(31 - 9), SPI_COM_LST = BIT(31 - 9),
}; };
struct mpc8xxx_priv {
spi8xxx_t *spi;
struct gpio_desc gpios[16];
int max_cs;
};
static inline u32 to_prescale_mod(u32 val) static inline u32 to_prescale_mod(u32 val)
{ {
return (min(val, (u32)15) << 16); return (min(val, (u32)15) << 16);
@ -42,70 +50,90 @@ static void set_char_len(spi8xxx_t *spi, u32 val)
#define SPI_TIMEOUT 1000 #define SPI_TIMEOUT 1000
struct spi_slave *spi_setup_slave(uint bus, uint cs, uint max_hz, uint mode) static int __spi_set_speed(spi8xxx_t *spi, uint speed)
{ {
struct spi_slave *slave; /* TODO(mario.six@gdsys.cc): This only ever sets one fixed speed */
if (!spi_cs_is_valid(bus, cs)) /* Use SYSCLK / 8 (16.67MHz typ.) */
return NULL; clrsetbits_be32(&spi->mode, SPI_MODE_PM_MASK, to_prescale_mod(1));
slave = spi_alloc_slave_base(bus, cs); return 0;
if (!slave)
return NULL;
/*
* TODO: Some of the code in spi_init() should probably move
* here, or into spi_claim_bus() below.
*/
return slave;
} }
void spi_free_slave(struct spi_slave *slave) static int mpc8xxx_spi_ofdata_to_platdata(struct udevice *dev)
{ {
free(slave); struct mpc8xxx_priv *priv = dev_get_priv(dev);
int ret;
priv->spi = (spi8xxx_t *)dev_read_addr(dev);
/* TODO(mario.six@gdsys.cc): Read clock and save the value */
ret = gpio_request_list_by_name(dev, "gpios", priv->gpios,
ARRAY_SIZE(priv->gpios), GPIOD_IS_OUT | GPIOD_ACTIVE_LOW);
if (ret < 0)
return -EINVAL;
priv->max_cs = ret;
return 0;
} }
void spi_init(void) static int mpc8xxx_spi_probe(struct udevice *dev)
{ {
spi8xxx_t *spi = &((immap_t *)(CONFIG_SYS_IMMR))->spi; struct mpc8xxx_priv *priv = dev_get_priv(dev);
/* /*
* SPI pins on the MPC83xx are not muxed, so all we do is initialize * SPI pins on the MPC83xx are not muxed, so all we do is initialize
* some registers * some registers
*/ */
out_be32(&spi->mode, SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN); out_be32(&priv->spi->mode, SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN);
/* Use SYSCLK / 8 (16.67MHz typ.) */
clrsetbits_be32(&spi->mode, SPI_MODE_PM_MASK, to_prescale_mod(1)); __spi_set_speed(priv->spi, 16666667);
/* Clear all SPI events */
setbits_be32(&spi->event, 0xffffffff); /* Clear all SPI events */
/* Mask all SPI interrupts */ setbits_be32(&priv->spi->event, 0xffffffff);
clrbits_be32(&spi->mask, 0xffffffff); /* Mask all SPI interrupts */
/* LST bit doesn't do anything, so disregard */ clrbits_be32(&priv->spi->mask, 0xffffffff);
out_be32(&spi->com, 0); /* LST bit doesn't do anything, so disregard */
} out_be32(&priv->spi->com, 0);
int spi_claim_bus(struct spi_slave *slave)
{
return 0; return 0;
} }
void spi_release_bus(struct spi_slave *slave) static void mpc8xxx_spi_cs_activate(struct udevice *dev)
{ {
struct mpc8xxx_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_platdata *platdata = dev_get_parent_platdata(dev);
dm_gpio_set_dir_flags(&priv->gpios[platdata->cs], GPIOD_IS_OUT);
dm_gpio_set_value(&priv->gpios[platdata->cs], 0);
} }
int spi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, void *din, static void mpc8xxx_spi_cs_deactivate(struct udevice *dev)
ulong flags)
{ {
spi8xxx_t *spi = &((immap_t *)(CONFIG_SYS_IMMR))->spi; struct mpc8xxx_priv *priv = dev_get_priv(dev->parent);
u32 tmpdin; struct dm_spi_slave_platdata *platdata = dev_get_parent_platdata(dev);
dm_gpio_set_dir_flags(&priv->gpios[platdata->cs], GPIOD_IS_OUT);
dm_gpio_set_value(&priv->gpios[platdata->cs], 1);
}
static int mpc8xxx_spi_xfer(struct udevice *dev, uint bitlen,
const void *dout, void *din, ulong flags)
{
struct udevice *bus = dev->parent;
struct mpc8xxx_priv *priv = dev_get_priv(bus);
spi8xxx_t *spi = priv->spi;
struct dm_spi_slave_platdata *platdata = dev_get_parent_platdata(dev);
u32 tmpdin = 0;
int num_blks = DIV_ROUND_UP(bitlen, 32); int num_blks = DIV_ROUND_UP(bitlen, 32);
debug("%s: slave %u:%u dout %08X din %08X bitlen %u\n", __func__, debug("%s: slave %s:%u dout %08X din %08X bitlen %u\n", __func__,
slave->bus, slave->cs, *(uint *)dout, *(uint *)din, bitlen); bus->name, platdata->cs, *(uint *)dout, *(uint *)din, bitlen);
if (flags & SPI_XFER_BEGIN) if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave); mpc8xxx_spi_cs_activate(dev);
/* Clear all SPI events */ /* Clear all SPI events */
setbits_be32(&spi->event, 0xffffffff); setbits_be32(&spi->event, 0xffffffff);
@ -178,15 +206,57 @@ int spi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, void *din,
mdelay(1); mdelay(1);
} while (get_timer(start) < SPI_TIMEOUT); } while (get_timer(start) < SPI_TIMEOUT);
if (get_timer(start) >= SPI_TIMEOUT) if (get_timer(start) >= SPI_TIMEOUT) {
debug("*** %s: Time out during SPI transfer\n", debug("*** %s: Time out during SPI transfer\n",
__func__); __func__);
return -ETIMEDOUT;
}
debug("*** %s: transfer ended. Value=%08x\n", __func__, tmpdin); debug("*** %s: transfer ended. Value=%08x\n", __func__, tmpdin);
} }
if (flags & SPI_XFER_END) if (flags & SPI_XFER_END)
spi_cs_deactivate(slave); mpc8xxx_spi_cs_deactivate(dev);
return 0; return 0;
} }
static int mpc8xxx_spi_set_speed(struct udevice *dev, uint speed)
{
struct mpc8xxx_priv *priv = dev_get_priv(dev);
return __spi_set_speed(priv->spi, speed);
}
static int mpc8xxx_spi_set_mode(struct udevice *dev, uint mode)
{
/* TODO(mario.six@gdsys.cc): Using SPI_CPHA (for clock phase) and
* SPI_CPOL (for clock polarity) should work
*/
return 0;
}
static const struct dm_spi_ops mpc8xxx_spi_ops = {
.xfer = mpc8xxx_spi_xfer,
.set_speed = mpc8xxx_spi_set_speed,
.set_mode = mpc8xxx_spi_set_mode,
/*
* cs_info is not needed, since we require all chip selects to be
* in the device tree explicitly
*/
};
static const struct udevice_id mpc8xxx_spi_ids[] = {
{ .compatible = "fsl,spi" },
{ }
};
U_BOOT_DRIVER(mpc8xxx_spi) = {
.name = "mpc8xxx_spi",
.id = UCLASS_SPI,
.of_match = mpc8xxx_spi_ids,
.ops = &mpc8xxx_spi_ops,
.ofdata_to_platdata = mpc8xxx_spi_ofdata_to_platdata,
.probe = mpc8xxx_spi_probe,
.priv_auto_alloc_size = sizeof(struct mpc8xxx_priv),
};