add SPI framework.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1911 bbd45198-f89e-11dd-88c7-29a3b14d5316

2 files changed, 412 insertions, 0 deletions

diff --git a/components/drivers/spi/spi_core.c b/components/drivers/spi/spi_core.c
new file mode 100644
index 0000000000..d4c265da6d
--- /dev/null
+++ b/components/drivers/spi/spi_core.c
@@ -0,0 +1,263 @@
+#include <drivers/spi.h>

+

+extern rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name);

+extern rt_err_t rt_spidev_device_init(struct rt_spi_device* dev, const char* name);

+

+rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops)

+{

+	rt_err_t result;

+

+	result = rt_spi_bus_device_init(bus, name);

+	if (result != RT_EOK) return result;

+

+	/* initialize mutex lock */

+	rt_mutex_init(&(bus->lock), name, RT_IPC_FLAG_FIFO);

+	/* set ops */

+	bus->ops = ops;

+	/* initialize owner */

+	bus->owner = RT_NULL;

+

+	return RT_EOK;

+}

+

+rt_err_t rt_spi_bus_attach_device(struct rt_spi_device* device, const char* name, const char* bus_name, void* user_data)

+{

+	rt_device_t bus;

+

+	/* get physical spi bus */

+	bus = rt_device_find(bus_name);

+	if (bus != RT_NULL && bus->type == RT_Device_Class_SPIBUS)

+	{

+		device->bus = (struct rt_spi_bus*)bus;

+

+		/* initialize spidev device */

+		rt_spidev_device_init(device, name);

+		rt_memset(&device->config, 0, sizeof(device->config));

+		device->parent.user_data = user_data;

+	}

+

+	/* not found the host bus */

+	return -RT_ERROR;

+}

+

+rt_err_t rt_spi_configure(struct rt_spi_device* device, struct rt_spi_configuration* cfg)

+{

+	rt_err_t result;

+

+	RT_ASSERT(device != RT_NULL);

+

+	/* set configuration */

+	device->config.data_width = cfg->data_width;

+	device->config.mode = cfg->mode & RT_SPI_MODE_MASK ;

+	device->config.max_hz = cfg->max_hz ;

+

+	if (device->bus != RT_NULL)

+	{

+		result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);

+		if (result == RT_EOK)

+		{

+			if (device->bus->owner == device)

+			{

+				device->bus->ops->configure(device, &device->config);

+			}

+

+			/* release lock */

+			rt_mutex_release(&(device->bus->lock));

+		}

+	}

+

+	return RT_EOK;

+}

+

+rt_err_t rt_spi_send_then_send(struct rt_spi_device* device, const void *send_buf1, rt_size_t send_length1,

+		const void* send_buf2, rt_size_t send_length2)

+{

+	rt_err_t result;

+	struct rt_spi_message message;

+

+	RT_ASSERT(device != RT_NULL);

+	RT_ASSERT(device->bus != RT_NULL);

+

+	result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);

+	if (result == RT_EOK)

+	{

+		if (device->bus->owner != device)

+		{

+			/* not the same owner as current, re-configure SPI bus */

+			result = device->bus->ops->configure(device, &device->config);

+			if (result == RT_EOK)

+			{

+				/* set SPI bus owner */

+				device->bus->owner = device;

+			}

+			else

+			{

+				/* configure SPI bus failed */

+				result = -RT_EIO;

+				goto __exit;

+			}

+		}

+

+		/* send data1 */

+		message.send_buf = send_buf1;

+		message.recv_buf = RT_NULL;

+		message.length = send_length1;

+		message.cs_take = 1;

+		message.cs_release = 0;

+

+		result = device->bus->ops->xfer(device, &message);

+		if (result == 0)

+		{

+			result = -RT_EIO;

+			goto __exit;

+		}

+

+		/* send data2 */

+		message.send_buf = send_buf2;

+		message.recv_buf = RT_NULL;

+		message.length = send_length2;

+		message.cs_take = 0;

+		message.cs_release = 1;

+

+		result = device->bus->ops->xfer(device, &message);

+		if (result == 0)

+		{

+			result = -RT_EIO;

+			goto __exit;

+		}

+

+		result = RT_EOK;

+	}

+	else

+	{

+		return -RT_EIO;

+	}

+

+__exit:

+	rt_mutex_release(&(device->bus->lock));

+	return result;

+}

+

+rt_err_t rt_spi_send_then_recv(struct rt_spi_device* device, const void *send_buf, rt_size_t send_length,

+		void* recv_buf, rt_size_t recv_length)

+{

+	rt_err_t result;

+	struct rt_spi_message message;

+

+	RT_ASSERT(device != RT_NULL);

+	RT_ASSERT(device->bus != RT_NULL);

+

+	result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);

+	if (result == RT_EOK)

+	{

+		if (device->bus->owner != device)

+		{

+			/* not the same owner as current, re-configure SPI bus */

+			result = device->bus->ops->configure(device, &device->config);

+			if (result == RT_EOK)

+			{

+				/* set SPI bus owner */

+				device->bus->owner = device;

+			}

+			else

+			{

+				/* configure SPI bus failed */

+				result = -RT_EIO;

+				goto __exit;

+			}

+		}

+

+		/* send data */

+		message.send_buf = send_buf;

+		message.recv_buf = RT_NULL;

+		message.length = send_length;

+		message.cs_take = 1;

+		message.cs_release = 0;

+

+		result = device->bus->ops->xfer(device, &message);

+		if (result == 0)

+		{

+			result = -RT_EIO;

+			goto __exit;

+		}

+

+		/* recv data */

+		message.send_buf = RT_NULL;

+		message.recv_buf = recv_buf;

+		message.length = recv_length;

+		message.cs_take = 0;

+		message.cs_release = 1;

+

+		result = device->bus->ops->xfer(device, &message);

+		if (result == 0)

+		{

+			result = -RT_EIO;

+			goto __exit;

+		}

+

+		result = RT_EOK;

+	}

+	else

+	{

+		return -RT_EIO;

+	}

+

+__exit:

+	rt_mutex_release(&(device->bus->lock));

+	return result;

+}

+

+rt_size_t rt_spi_transfer(struct rt_spi_device* device, const void *send_buf,

+		void* recv_buf, rt_size_t length)

+{

+	rt_err_t result;

+	struct rt_spi_message message;

+

+	RT_ASSERT(device != RT_NULL);

+	RT_ASSERT(device->bus != RT_NULL);

+

+	result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);

+	if (result == RT_EOK)

+	{

+		if (device->bus->owner != device)

+		{

+			/* not the same owner as current, re-configure SPI bus */

+			result = device->bus->ops->configure(device, &device->config);

+			if (result == RT_EOK)

+			{

+				/* set SPI bus owner */

+				device->bus->owner = device;

+			}

+			else

+			{

+				/* configure SPI bus failed */

+				rt_set_errno(-RT_EIO);

+				result = 0;

+				goto __exit;

+			}

+		}

+

+		/* initial message */

+		message.send_buf = send_buf;

+		message.recv_buf = recv_buf;

+		message.length = length;

+		message.cs_take = message.cs_release = 1;

+

+		/* transfer message */

+		result = device->bus->ops->xfer(device, &message);

+		if (result == 0)

+		{

+			rt_set_errno(-RT_EIO);

+			goto __exit;

+		}

+	}

+	else

+	{

+		rt_set_errno(-RT_EIO);

+		return 0;

+	}

+

+__exit:

+	rt_mutex_release(&(device->bus->lock));

+	return result;

+}

diff --git a/components/drivers/spi/spi_dev.c b/components/drivers/spi/spi_dev.c
new file mode 100644
index 0000000000..afb17dafde
--- /dev/null
+++ b/components/drivers/spi/spi_dev.c
@@ -0,0 +1,149 @@
+#include <rtthread.h>

+#include <drivers/spi.h>

+

+/* SPI bus device interface, compatible with RT-Thread 0.3.x/1.0.x */

+static rt_err_t _spi_bus_device_init(rt_device_t dev)

+{

+	struct rt_spi_bus* bus;

+

+	bus = (struct rt_spi_bus*) dev;

+	RT_ASSERT(bus != RT_NULL);

+

+	return RT_EOK;

+}

+

+static rt_size_t _spi_bus_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)

+{

+	struct rt_spi_bus* bus;

+

+	bus = (struct rt_spi_bus*) dev;

+	RT_ASSERT(bus != RT_NULL);

+	RT_ASSERT(bus->owner != RT_NULL);

+

+	return rt_spi_transfer(bus->owner, RT_NULL, buffer, size);

+}

+

+static rt_size_t _spi_bus_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)

+{

+	struct rt_spi_bus* bus;

+

+	bus = (struct rt_spi_bus*) dev;

+	RT_ASSERT(bus != RT_NULL);

+	RT_ASSERT(bus->owner != RT_NULL);

+

+	return rt_spi_transfer(bus->owner, buffer, RT_NULL, size);

+}

+

+static rt_err_t _spi_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)

+{

+	struct rt_spi_bus* bus;

+

+	bus = (struct rt_spi_bus*) dev;

+	RT_ASSERT(bus != RT_NULL);

+

+	switch (cmd)

+	{

+	case 0: /* set device */

+		break;

+	case 1:	

+		break;

+	}

+

+	return RT_EOK;

+}

+

+rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name)

+{

+	struct rt_device *device;

+	RT_ASSERT(bus != RT_NULL);

+

+	device = &bus->parent;

+

+	/* set device type */

+	device->type    = RT_Device_Class_SPIBUS;

+	/* initialize device interface */

+	device->init	= _spi_bus_device_init;

+	device->open	= RT_NULL;

+	device->close	= RT_NULL;

+	device->read	= _spi_bus_device_read;

+	device->write	= _spi_bus_device_write;

+	device->control = _spi_bus_device_control;

+

+	/* register to device manager */

+	rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);

+

+	return RT_EOK;

+}

+

+/* SPI Dev device interface, compatible with RT-Thread 0.3.x/1.0.x */

+static rt_err_t _spidev_device_init(rt_device_t dev)

+{

+	struct rt_spi_device* device;

+

+	device = (struct rt_spi_device*) dev;

+	RT_ASSERT(device != RT_NULL);

+

+	return RT_EOK;

+}

+

+static rt_size_t _spidev_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)

+{

+	struct rt_spi_device* device;

+

+	device = (struct rt_spi_device*) dev;

+	RT_ASSERT(device != RT_NULL);

+	RT_ASSERT(device->bus != RT_NULL);

+

+	return rt_spi_transfer(device, RT_NULL, buffer, size);

+}

+

+static rt_size_t _spidev_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)

+{

+	struct rt_spi_device* device;

+

+	device = (struct rt_spi_device*) dev;

+	RT_ASSERT(device != RT_NULL);

+	RT_ASSERT(device->bus != RT_NULL);

+

+	return rt_spi_transfer(device, buffer, RT_NULL, size);

+}

+

+static rt_err_t _spidev_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)

+{

+	struct rt_spi_device* device;

+

+	device = (struct rt_spi_device*) dev;

+	RT_ASSERT(device != RT_NULL);

+

+	switch (cmd)

+	{

+	case 0: /* set device */

+		break;

+	case 1:	

+		break;

+	}

+

+	return RT_EOK;

+}

+

+rt_err_t rt_spidev_device_init(struct rt_spi_device* dev, const char* name)

+{

+	struct rt_device* device;

+	RT_ASSERT(device != RT_NULL);

+	

+	device = &(dev->parent);

+	

+	/* set device type */

+	device->type 	= RT_Device_Class_SPIDevice;

+	device->init 	= _spidev_device_init;

+	device->open 	= RT_NULL;

+	device->close 	= RT_NULL;

+	device->read 	= _spidev_device_read;

+	device->write 	= _spidev_device_write;

+	device->control = _spidev_device_control;

+	

+	/* register to device manager */

+	rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);

+

+	return RT_EOK;

+}