drivers/spi/spi-uclass.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (c) 2014 Google, Inc
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <malloc.h>
 #include <spi.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <dm/root.h>
 #include <dm/lists.h>
 #include <dm/util.h>

 DECLARE_GLOBAL_DATA_PTR;

 static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
 {
 	struct dm_spi_ops *ops;
 	int ret;

 	ops = spi_get_ops(bus);
 	if (ops->set_speed)
 		ret = ops->set_speed(bus, speed);
 	else
 		ret = -EINVAL;
 	if (ret) {
 		printf("Cannot set speed (err=%d)\n", ret);
 		return ret;
 	}

 	if (ops->set_mode)
 		ret = ops->set_mode(bus, mode);
 	else
 		ret = -EINVAL;
 	if (ret) {
 		printf("Cannot set mode (err=%d)\n", ret);
 		return ret;
 	}

 	return 0;
 }

 int spi_claim_bus(struct spi_slave *slave)
 {
 	struct udevice *dev = slave->dev;
 	struct udevice *bus = dev->parent;
 	struct dm_spi_ops *ops = spi_get_ops(bus);
 	struct dm_spi_bus *spi = bus->uclass_priv;
 	int speed;
 	int ret;

 	speed = slave->max_hz;
 	if (spi->max_hz) {
 		if (speed)
 			speed = min(speed, (int)spi->max_hz);
 		else
 			speed = spi->max_hz;
 	}
 	if (!speed)
 		speed = 100000;
 	ret = spi_set_speed_mode(bus, speed, slave->mode);
 	if (ret)
 		return ret;

 	return ops->claim_bus ? ops->claim_bus(bus) : 0;
 }

 void spi_release_bus(struct spi_slave *slave)
 {
 	struct udevice *dev = slave->dev;
 	struct udevice *bus = dev->parent;
 	struct dm_spi_ops *ops = spi_get_ops(bus);

 	if (ops->release_bus)
 		ops->release_bus(bus);
 }

 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	     const void *dout, void *din, unsigned long flags)
 {
 	struct udevice *dev = slave->dev;
 	struct udevice *bus = dev->parent;

 	if (bus->uclass->uc_drv->id != UCLASS_SPI)
 		return -EOPNOTSUPP;

 	return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
 }

 int spi_post_bind(struct udevice *dev)
 {
 	/* Scan the bus for devices */
 	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 }

 int spi_post_probe(struct udevice *dev)
 {
 	struct dm_spi_bus *spi = dev->uclass_priv;

 	spi->max_hz = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 				     "spi-max-frequency", 0);

 	return 0;
 }

 int spi_chip_select(struct udevice *dev)
 {
 	struct spi_slave *slave = dev_get_parentdata(dev);

 	return slave ? slave->cs : -ENOENT;
 }

 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
 {
 	struct udevice *dev;

 	for (device_find_first_child(bus, &dev); dev;
 	     device_find_next_child(&dev)) {
 		struct spi_slave store;
 		struct spi_slave *slave = dev_get_parentdata(dev);

 		if (!slave)  {
 			slave = &store;
 			spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
 					       slave);
 		}
 		debug("%s: slave=%p, cs=%d\n", __func__, slave,
 		      slave ? slave->cs : -1);
 		if (slave && slave->cs == cs) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }

 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
 {
 	struct spi_cs_info info;
 	struct udevice *bus;
 	int ret;

 	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
 	if (ret) {
 		debug("%s: No bus %d\n", __func__, busnum);
 		return ret;
 	}

 	return spi_cs_info(bus, cs, &info);
 }

 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
 {
 	struct spi_cs_info local_info;
 	struct dm_spi_ops *ops;
 	int ret;

 	if (!info)
 		info = &local_info;

 	/* If there is a device attached, return it */
 	info->dev = NULL;
 	ret = spi_find_chip_select(bus, cs, &info->dev);
 	if (!ret)
 		return 0;

 	/*
 	 * Otherwise ask the driver. For the moment we don't have CS info.
 	 * When we do we could provide the driver with a helper function
 	 * to figure out what chip selects are valid, or just handle the
 	 * request.
 	 */
 	ops = spi_get_ops(bus);
 	if (ops->cs_info)
 		return ops->cs_info(bus, cs, info);

 	/*
 	 * We could assume there is at least one valid chip select, but best
 	 * to be sure and return an error in this case. The driver didn't
 	 * care enough to tell us.
 	 */
 	return -ENODEV;
 }

 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
 			struct udevice **devp)
 {
 	struct udevice *bus, *dev;
 	int ret;

 	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
 	if (ret) {
 		debug("%s: No bus %d\n", __func__, busnum);
 		return ret;
 	}
 	ret = spi_find_chip_select(bus, cs, &dev);
 	if (ret) {
 		debug("%s: No cs %d\n", __func__, cs);
 		return ret;
 	}
 	*busp = bus;
 	*devp = dev;

 	return ret;
 }

 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 		       const char *drv_name, const char *dev_name,
 		       struct udevice **busp, struct spi_slave **devp)
 {
 	struct udevice *bus, *dev;
 	struct spi_slave *slave;
 	bool created = false;
 	int ret;

 	ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
 	if (ret) {
 		printf("Invalid bus %d (err=%d)\n", busnum, ret);
 		return ret;
 	}
 	ret = spi_find_chip_select(bus, cs, &dev);

 	/*
 	 * If there is no such device, create one automatically. This means
 	 * that we don't need a device tree node or platform data for the
 	 * SPI flash chip - we will bind to the correct driver.
 	 */
 	if (ret == -ENODEV && drv_name) {
 		debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
 		      __func__, dev_name, busnum, cs, drv_name);
 		ret = device_bind_driver(bus, drv_name, dev_name, &dev);
 		if (ret)
 			return ret;
 		created = true;
 	} else if (ret) {
 		printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
 		       ret);
 		return ret;
 	}

 	if (!device_active(dev)) {
 		slave = (struct spi_slave *)calloc(1,
 						   sizeof(struct spi_slave));
 		if (!slave) {
 			ret = -ENOMEM;
 			goto err;
 		}

 		ret = spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
 					     slave);
 		if (ret)
 			goto err;
 		slave->cs = cs;
 		slave->dev = dev;
 		ret = device_probe_child(dev, slave);
 		free(slave);
 		if (ret)
 			goto err;
 	}

 	ret = spi_set_speed_mode(bus, speed, mode);
 	if (ret)
 		goto err;

 	*busp = bus;
 	*devp = dev_get_parentdata(dev);
 	debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);

 	return 0;

 err:
 	if (created) {
 		device_remove(dev);
 		device_unbind(dev);
 	}

 	return ret;
 }

 /* Compatibility function - to be removed */
 struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
 				      int bus_node)
 {
 	struct udevice *bus, *dev;
 	int ret;

 	ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
 	if (ret)
 		return NULL;
 	ret = device_get_child_by_of_offset(bus, node, &dev);
 	if (ret)
 		return NULL;
 	return dev_get_parentdata(dev);
 }

 /* Compatibility function - to be removed */
 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
 				  unsigned int speed, unsigned int mode)
 {
 	struct spi_slave *slave;
 	struct udevice *dev;
 	int ret;

 	ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
 				  &slave);
 	if (ret)
 		return NULL;

 	return slave;
 }

 void spi_free_slave(struct spi_slave *slave)
 {
 	device_remove(slave->dev);
 	slave->dev = NULL;
 }

 int spi_ofdata_to_platdata(const void *blob, int node,
 			   struct spi_slave *spi)
 {
 	int mode = 0;

 	spi->cs = fdtdec_get_int(blob, node, "reg", -1);
 	spi->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
 	if (fdtdec_get_bool(blob, node, "spi-cpol"))
 		mode |= SPI_CPOL;
 	if (fdtdec_get_bool(blob, node, "spi-cpha"))
 		mode |= SPI_CPHA;
 	if (fdtdec_get_bool(blob, node, "spi-cs-high"))
 		mode |= SPI_CS_HIGH;
 	if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
 		mode |= SPI_PREAMBLE;
 	spi->mode = mode;

 	return 0;
 }

 UCLASS_DRIVER(spi) = {
 	.id		= UCLASS_SPI,
 	.name		= "spi",
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 	.post_bind	= spi_post_bind,
 	.post_probe	= spi_post_probe,
 	.per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
 	.per_child_auto_alloc_size = sizeof(struct spi_slave),
 };

 UCLASS_DRIVER(spi_generic) = {
 	.id		= UCLASS_SPI_GENERIC,
 	.name		= "spi_generic",
 };

 U_BOOT_DRIVER(spi_generic_drv) = {
 	.name		= "spi_generic_drv",
 	.id		= UCLASS_SPI_GENERIC,
 };
	/*
	* Copyright (c) 2014 Google, Inc
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <malloc.h>
	#include <spi.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#include <dm/root.h>
	#include <dm/lists.h>
	#include <dm/util.h>

	DECLARE_GLOBAL_DATA_PTR;

	static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
	{
	struct dm_spi_ops *ops;
	int ret;

	ops = spi_get_ops(bus);
	if (ops->set_speed)
	ret = ops->set_speed(bus, speed);
	else
	ret = -EINVAL;
	if (ret) {
	printf("Cannot set speed (err=%d)\n", ret);
	return ret;
	}

	if (ops->set_mode)
	ret = ops->set_mode(bus, mode);
	else
	ret = -EINVAL;
	if (ret) {
	printf("Cannot set mode (err=%d)\n", ret);
	return ret;
	}

	return 0;
	}

	int spi_claim_bus(struct spi_slave *slave)
	{
	struct udevice *dev = slave->dev;
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);
	struct dm_spi_bus *spi = bus->uclass_priv;
	int speed;
	int ret;

	speed = slave->max_hz;
	if (spi->max_hz) {
	if (speed)
	speed = min(speed, (int)spi->max_hz);
	else
	speed = spi->max_hz;
	}
	if (!speed)
	speed = 100000;
	ret = spi_set_speed_mode(bus, speed, slave->mode);
	if (ret)
	return ret;

	return ops->claim_bus ? ops->claim_bus(bus) : 0;
	}

	void spi_release_bus(struct spi_slave *slave)
	{
	struct udevice *dev = slave->dev;
	struct udevice *bus = dev->parent;
	struct dm_spi_ops *ops = spi_get_ops(bus);

	if (ops->release_bus)
	ops->release_bus(bus);
	}

	int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
	const void dout, void din, unsigned long flags)
	{
	struct udevice *dev = slave->dev;
	struct udevice *bus = dev->parent;

	if (bus->uclass->uc_drv->id != UCLASS_SPI)
	return -EOPNOTSUPP;

	return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
	}

	int spi_post_bind(struct udevice *dev)
	{
	/* Scan the bus for devices */
	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
	}

	int spi_post_probe(struct udevice *dev)
	{
	struct dm_spi_bus *spi = dev->uclass_priv;

	spi->max_hz = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
	"spi-max-frequency", 0);

	return 0;
	}

	int spi_chip_select(struct udevice *dev)
	{
	struct spi_slave *slave = dev_get_parentdata(dev);

	return slave ? slave->cs : -ENOENT;
	}

	int spi_find_chip_select(struct udevice bus, int cs, struct udevice *devp)
	{
	struct udevice *dev;

	for (device_find_first_child(bus, &dev); dev;
	device_find_next_child(&dev)) {
	struct spi_slave store;
	struct spi_slave *slave = dev_get_parentdata(dev);

	if (!slave) {
	slave = &store;
	spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
	slave);
	}
	debug("%s: slave=%p, cs=%d\n", __func__, slave,
	slave ? slave->cs : -1);
	if (slave && slave->cs == cs) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}

	int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
	{
	struct spi_cs_info info;
	struct udevice *bus;
	int ret;

	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
	if (ret) {
	debug("%s: No bus %d\n", __func__, busnum);
	return ret;
	}

	return spi_cs_info(bus, cs, &info);
	}

	int spi_cs_info(struct udevice bus, uint cs, struct spi_cs_info info)
	{
	struct spi_cs_info local_info;
	struct dm_spi_ops *ops;
	int ret;

	if (!info)
	info = &local_info;

	/* If there is a device attached, return it */
	info->dev = NULL;
	ret = spi_find_chip_select(bus, cs, &info->dev);
	if (!ret)
	return 0;

	/*
	* Otherwise ask the driver. For the moment we don't have CS info.
	* When we do we could provide the driver with a helper function
	* to figure out what chip selects are valid, or just handle the
	* request.
	*/
	ops = spi_get_ops(bus);
	if (ops->cs_info)
	return ops->cs_info(bus, cs, info);

	/*
	* We could assume there is at least one valid chip select, but best
	* to be sure and return an error in this case. The driver didn't
	* care enough to tell us.
	*/
	return -ENODEV;
	}

	int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
	struct udevice **devp)
	{
	struct udevice bus, dev;
	int ret;

	ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
	if (ret) {
	debug("%s: No bus %d\n", __func__, busnum);
	return ret;
	}
	ret = spi_find_chip_select(bus, cs, &dev);
	if (ret) {
	debug("%s: No cs %d\n", __func__, cs);
	return ret;
	}
	*busp = bus;
	*devp = dev;

	return ret;
	}

	int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
	const char drv_name, const char dev_name,
	struct udevice busp, struct spi_slave devp)
	{
	struct udevice bus, dev;
	struct spi_slave *slave;
	bool created = false;
	int ret;

	ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
	if (ret) {
	printf("Invalid bus %d (err=%d)\n", busnum, ret);
	return ret;
	}
	ret = spi_find_chip_select(bus, cs, &dev);

	/*
	* If there is no such device, create one automatically. This means
	* that we don't need a device tree node or platform data for the
	* SPI flash chip - we will bind to the correct driver.
	*/
	if (ret == -ENODEV && drv_name) {
	debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
	__func__, dev_name, busnum, cs, drv_name);
	ret = device_bind_driver(bus, drv_name, dev_name, &dev);
	if (ret)
	return ret;
	created = true;
	} else if (ret) {
	printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
	ret);
	return ret;
	}

	if (!device_active(dev)) {
	slave = (struct spi_slave *)calloc(1,
	sizeof(struct spi_slave));
	if (!slave) {
	ret = -ENOMEM;
	goto err;
	}

	ret = spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
	slave);
	if (ret)
	goto err;
	slave->cs = cs;
	slave->dev = dev;
	ret = device_probe_child(dev, slave);
	free(slave);
	if (ret)
	goto err;
	}

	ret = spi_set_speed_mode(bus, speed, mode);
	if (ret)
	goto err;

	*busp = bus;
	*devp = dev_get_parentdata(dev);
	debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);

	return 0;

	err:
	if (created) {
	device_remove(dev);
	device_unbind(dev);
	}

	return ret;
	}

	/* Compatibility function - to be removed */
	struct spi_slave spi_setup_slave_fdt(const void blob, int node,
	int bus_node)
	{
	struct udevice bus, dev;
	int ret;

	ret = uclass_get_device_by_of_offset(UCLASS_SPI, bus_node, &bus);
	if (ret)
	return NULL;
	ret = device_get_child_by_of_offset(bus, node, &dev);
	if (ret)
	return NULL;
	return dev_get_parentdata(dev);
	}

	/* Compatibility function - to be removed */
	struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
	unsigned int speed, unsigned int mode)
	{
	struct spi_slave *slave;
	struct udevice *dev;
	int ret;

	ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
	&slave);
	if (ret)
	return NULL;

	return slave;
	}

	void spi_free_slave(struct spi_slave *slave)
	{
	device_remove(slave->dev);
	slave->dev = NULL;
	}

	int spi_ofdata_to_platdata(const void *blob, int node,
	struct spi_slave *spi)
	{
	int mode = 0;

	spi->cs = fdtdec_get_int(blob, node, "reg", -1);
	spi->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0);
	if (fdtdec_get_bool(blob, node, "spi-cpol"))
	mode \|= SPI_CPOL;
	if (fdtdec_get_bool(blob, node, "spi-cpha"))
	mode \|= SPI_CPHA;
	if (fdtdec_get_bool(blob, node, "spi-cs-high"))
	mode \|= SPI_CS_HIGH;
	if (fdtdec_get_bool(blob, node, "spi-half-duplex"))
	mode \|= SPI_PREAMBLE;
	spi->mode = mode;

	return 0;
	}

	UCLASS_DRIVER(spi) = {
	.id = UCLASS_SPI,
	.name = "spi",
	.flags = DM_UC_FLAG_SEQ_ALIAS,
	.post_bind = spi_post_bind,
	.post_probe = spi_post_probe,
	.per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
	.per_child_auto_alloc_size = sizeof(struct spi_slave),
	};

	UCLASS_DRIVER(spi_generic) = {
	.id = UCLASS_SPI_GENERIC,
	.name = "spi_generic",
	};

	U_BOOT_DRIVER(spi_generic_drv) = {
	.name = "spi_generic_drv",
	.id = UCLASS_SPI_GENERIC,
	};