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spi: mxc_spi: support driver model

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Add driver model support for mxc spi driver.
Most functions are restructured to be reused by DM and non-DM.
Tested on mx6slevk/mx6qsabresd board.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
master
Peng Fan 7 years ago committed by Jagan Teki
parent 1f6049e250
commit 994266bdff
1 changed files with 149 additions and 32 deletions
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  1. 181
      drivers/spi/mxc_spi.c

181
drivers/spi/mxc_spi.c
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@ -5,6 +5,7 @@
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <spi.h>
#include <linux/errno.h>
@ -14,6 +15,8 @@
#include <asm/arch/clock.h>
#include <asm/mach-imx/spi.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_MX27
/* i.MX27 has a completely wrong register layout and register definitions in the
* datasheet, the correct one is in the Freescale's Linux driver */
@ -22,10 +25,6 @@
"See linux mxc_spi driver from Freescale for details."
#endif
static unsigned long spi_bases[] = {
MXC_SPI_BASE_ADDRESSES
};
__weak int board_spi_cs_gpio(unsigned bus, unsigned cs)
{
return -1;
@ -51,6 +50,7 @@ struct mxc_spi_slave {
int ss_pol;
unsigned int max_hz;
unsigned int mode;
struct gpio_desc ss;
};
static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
@ -58,19 +58,24 @@ static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
return container_of(slave, struct mxc_spi_slave, slave);
}
void spi_cs_activate(struct spi_slave *slave)
static void mxc_spi_cs_activate(struct mxc_spi_slave *mxcs)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
if (mxcs->gpio > 0)
gpio_set_value(mxcs->gpio, mxcs->ss_pol);
if (CONFIG_IS_ENABLED(DM_SPI)) {
dm_gpio_set_value(&mxcs->ss, mxcs->ss_pol);
} else {
if (mxcs->gpio > 0)
gpio_set_value(mxcs->gpio, mxcs->ss_pol);
}
}
void spi_cs_deactivate(struct spi_slave *slave)
static void mxc_spi_cs_deactivate(struct mxc_spi_slave *mxcs)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
if (mxcs->gpio > 0)
gpio_set_value(mxcs->gpio,
!(mxcs->ss_pol));
if (CONFIG_IS_ENABLED(DM_SPI)) {
dm_gpio_set_value(&mxcs->ss, !(mxcs->ss_pol));
} else {
if (mxcs->gpio > 0)
gpio_set_value(mxcs->gpio, !(mxcs->ss_pol));
}
}
u32 get_cspi_div(u32 div)
@ -211,10 +216,9 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs)
}
#endif
int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
int spi_xchg_single(struct mxc_spi_slave *mxcs, unsigned int bitlen,
const u8 *dout, u8 *din, unsigned long flags)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
int nbytes = DIV_ROUND_UP(bitlen, 8);
u32 data, cnt, i;
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
@ -327,8 +331,9 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
static int mxc_spi_xfer_internal(struct mxc_spi_slave *mxcs,
unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
int n_bytes = DIV_ROUND_UP(bitlen, 8);
int n_bits;
@ -337,11 +342,11 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
u8 *p_outbuf = (u8 *)dout;
u8 *p_inbuf = (u8 *)din;
if (!slave)
return -1;
if (!mxcs)
return -EINVAL;
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave);
mxc_spi_cs_activate(mxcs);
while (n_bytes > 0) {
if (n_bytes < MAX_SPI_BYTES)
@ -351,7 +356,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
n_bits = blk_size * 8;
ret = spi_xchg_single(slave, n_bits, p_outbuf, p_inbuf, 0);
ret = spi_xchg_single(mxcs, n_bits, p_outbuf, p_inbuf, 0);
if (ret)
return ret;
@ -363,12 +368,39 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
}
if (flags & SPI_XFER_END) {
spi_cs_deactivate(slave);
mxc_spi_cs_deactivate(mxcs);
}
return 0;
}
static int mxc_spi_claim_bus_internal(struct mxc_spi_slave *mxcs, int cs)
{
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
int ret;
reg_write(&regs->rxdata, 1);
udelay(1);
ret = spi_cfg_mxc(mxcs, cs);
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
return ret;
}
reg_write(&regs->period, MXC_CSPIPERIOD_32KHZ);
reg_write(&regs->intr, 0);
return 0;
}
#ifndef CONFIG_DM_SPI
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
return mxc_spi_xfer_internal(mxcs, bitlen, dout, din, flags);
}
void spi_init(void)
{
}
@ -390,6 +422,7 @@ static int setup_cs_gpio(struct mxc_spi_slave *mxcs,
if (mxcs->gpio == -1)
return 0;
gpio_request(mxcs->gpio, "spi-cs");
ret = gpio_direction_output(mxcs->gpio, !(mxcs->ss_pol));
if (ret) {
printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio);
@ -399,6 +432,10 @@ static int setup_cs_gpio(struct mxc_spi_slave *mxcs,
return 0;
}
static unsigned long spi_bases[] = {
MXC_SPI_BASE_ADDRESSES
};
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
@ -443,24 +480,104 @@ void spi_free_slave(struct spi_slave *slave)
int spi_claim_bus(struct spi_slave *slave)
{
int ret;
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
reg_write(&regs->rxdata, 1);
udelay(1);
ret = spi_cfg_mxc(mxcs, slave->cs);
return mxc_spi_claim_bus_internal(mxcs, slave->cs);
}
void spi_release_bus(struct spi_slave *slave)
{
/* TODO: Shut the controller down */
}
#else
static int mxc_spi_probe(struct udevice *bus)
{
struct mxc_spi_slave *plat = bus->platdata;
struct mxc_spi_slave *mxcs = dev_get_platdata(bus);
int node = dev_of_offset(bus);
const void *blob = gd->fdt_blob;
int ret;
if (gpio_request_by_name(bus, "cs-gpios", 0, &plat->ss,
GPIOD_IS_OUT)) {
dev_err(bus, "No cs-gpios property\n");
return -EINVAL;
}
plat->base = dev_get_addr(bus);
if (plat->base == FDT_ADDR_T_NONE)
return -ENODEV;
ret = dm_gpio_set_value(&plat->ss, !(mxcs->ss_pol));
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
dev_err(bus, "Setting cs error\n");
return ret;
}
reg_write(&regs->period, MXC_CSPIPERIOD_32KHZ);
reg_write(&regs->intr, 0);
mxcs->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
20000000);
return 0;
}
void spi_release_bus(struct spi_slave *slave)
static int mxc_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
/* TODO: Shut the controller down */
struct mxc_spi_slave *mxcs = dev_get_platdata(dev->parent);
return mxc_spi_xfer_internal(mxcs, bitlen, dout, din, flags);
}
static int mxc_spi_claim_bus(struct udevice *dev)
{
struct mxc_spi_slave *mxcs = dev_get_platdata(dev->parent);
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
return mxc_spi_claim_bus_internal(mxcs, slave_plat->cs);
}
static int mxc_spi_release_bus(struct udevice *dev)
{
return 0;
}
static int mxc_spi_set_speed(struct udevice *bus, uint speed)
{
/* Nothing to do */
return 0;
}
static int mxc_spi_set_mode(struct udevice *bus, uint mode)
{
struct mxc_spi_slave *mxcs = dev_get_platdata(bus);
mxcs->mode = mode;
mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;
return 0;
}
static const struct dm_spi_ops mxc_spi_ops = {
.claim_bus = mxc_spi_claim_bus,
.release_bus = mxc_spi_release_bus,
.xfer = mxc_spi_xfer,
.set_speed = mxc_spi_set_speed,
.set_mode = mxc_spi_set_mode,
};
static const struct udevice_id mxc_spi_ids[] = {
{ .compatible = "fsl,imx51-ecspi" },
{ }
};
U_BOOT_DRIVER(mxc_spi) = {
.name = "mxc_spi",
.id = UCLASS_SPI,
.of_match = mxc_spi_ids,
.ops = &mxc_spi_ops,
.platdata_auto_alloc_size = sizeof(struct mxc_spi_slave),
.probe = mxc_spi_probe,
};
#endif

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