mirror of https://gitee.com/openkylin/linux.git
Xilinx: SPI: updated driver for device tree
The driver was updated to use the device tree rather than the platform data. Signed-off-by: John Linn <john.linn@xilinx.com>
This commit is contained in:
John Linn
Grant Likely
parent
2526c151c3
commit
ff82c587a9
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@ -15,12 +15,15 @@
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_device.h>
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#include <linux/of_spi.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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#include <linux/io.h>
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#include <syslib/virtex_devices.h>
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#define XILINX_SPI_NAME "xilinx_spi"
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/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e)
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@ -144,23 +147,14 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi,
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struct spi_transfer *t)
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{
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u8 bits_per_word;
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u32 hz;
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struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
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bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
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hz = (t) ? t->speed_hz : spi->max_speed_hz;
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if (bits_per_word != 8) {
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dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
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__func__, bits_per_word);
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return -EINVAL;
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}
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if (hz && xspi->speed_hz > hz) {
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dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n",
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__func__, hz);
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return -EINVAL;
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}
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return 0;
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}
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@ -304,32 +298,38 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
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return IRQ_HANDLED;
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}
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static int __init xilinx_spi_probe(struct platform_device *dev)
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static int __init xilinx_spi_of_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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int ret = 0;
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struct spi_master *master;
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struct xilinx_spi *xspi;
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struct xspi_platform_data *pdata;
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struct resource *r;
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struct resource r_irq_struct;
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struct resource r_mem_struct;
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struct resource *r_irq = &r_irq_struct;
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struct resource *r_mem = &r_mem_struct;
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int rc = 0;
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const u32 *prop;
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int len;
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/* Get resources(memory, IRQ) associated with the device */
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master = spi_alloc_master(&dev->dev, sizeof(struct xilinx_spi));
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master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi));
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if (master == NULL) {
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return -ENOMEM;
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}
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platform_set_drvdata(dev, master);
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pdata = dev->dev.platform_data;
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dev_set_drvdata(&ofdev->dev, master);
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if (pdata == NULL) {
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ret = -ENODEV;
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rc = of_address_to_resource(ofdev->node, 0, r_mem);
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if (rc) {
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dev_warn(&ofdev->dev, "invalid address\n");
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goto put_master;
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}
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r = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (r == NULL) {
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ret = -ENODEV;
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rc = of_irq_to_resource(ofdev->node, 0, r_irq);
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if (rc == NO_IRQ) {
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dev_warn(&ofdev->dev, "no IRQ found\n");
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goto put_master;
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}
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@ -341,47 +341,57 @@ static int __init xilinx_spi_probe(struct platform_device *dev)
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xspi->bitbang.master->setup = xilinx_spi_setup;
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init_completion(&xspi->done);
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if (!request_mem_region(r->start,
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r->end - r->start + 1, XILINX_SPI_NAME)) {
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ret = -ENXIO;
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xspi->irq = r_irq->start;
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if (!request_mem_region(r_mem->start,
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r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) {
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rc = -ENXIO;
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dev_warn(&ofdev->dev, "memory request failure\n");
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goto put_master;
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}
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xspi->regs = ioremap(r->start, r->end - r->start + 1);
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xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
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if (xspi->regs == NULL) {
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ret = -ENOMEM;
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rc = -ENOMEM;
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dev_warn(&ofdev->dev, "ioremap failure\n");
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goto put_master;
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}
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xspi->irq = r_irq->start;
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ret = platform_get_irq(dev, 0);
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if (ret < 0) {
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ret = -ENXIO;
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goto unmap_io;
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/* dynamic bus assignment */
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master->bus_num = -1;
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/* number of slave select bits is required */
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prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
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if (!prop || len < sizeof(*prop)) {
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dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
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goto put_master;
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}
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xspi->irq = ret;
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master->bus_num = pdata->bus_num;
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master->num_chipselect = pdata->num_chipselect;
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xspi->speed_hz = pdata->speed_hz;
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master->num_chipselect = *prop;
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/* SPI controller initializations */
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xspi_init_hw(xspi->regs);
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/* Register for SPI Interrupt */
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ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
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if (ret != 0)
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rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
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if (rc != 0) {
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dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq);
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goto unmap_io;
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}
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ret = spi_bitbang_start(&xspi->bitbang);
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if (ret != 0) {
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dev_err(&dev->dev, "spi_bitbang_start FAILED\n");
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rc = spi_bitbang_start(&xspi->bitbang);
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if (rc != 0) {
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dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n");
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goto free_irq;
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}
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dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
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r->start, (u32)xspi->regs, xspi->irq);
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dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
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(unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq);
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return ret;
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/* Add any subnodes on the SPI bus */
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of_register_spi_devices(master, ofdev->node);
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return rc;
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free_irq:
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free_irq(xspi->irq, xspi);
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@ -389,21 +399,21 @@ static int __init xilinx_spi_probe(struct platform_device *dev)
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iounmap(xspi->regs);
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put_master:
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spi_master_put(master);
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return ret;
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return rc;
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}
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static int __devexit xilinx_spi_remove(struct platform_device *dev)
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static int __devexit xilinx_spi_remove(struct of_device *ofdev)
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{
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struct xilinx_spi *xspi;
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struct spi_master *master;
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master = platform_get_drvdata(dev);
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master = platform_get_drvdata(ofdev);
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xspi = spi_master_get_devdata(master);
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spi_bitbang_stop(&xspi->bitbang);
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free_irq(xspi->irq, xspi);
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iounmap(xspi->regs);
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platform_set_drvdata(dev, 0);
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dev_set_drvdata(&ofdev->dev, 0);
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spi_master_put(xspi->bitbang.master);
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return 0;
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@ -412,27 +422,42 @@ static int __devexit xilinx_spi_remove(struct platform_device *dev)
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:" XILINX_SPI_NAME);
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static struct platform_driver xilinx_spi_driver = {
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.probe = xilinx_spi_probe,
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.remove = __devexit_p(xilinx_spi_remove),
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static int __exit xilinx_spi_of_remove(struct of_device *op)
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{
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return xilinx_spi_remove(op);
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}
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static struct of_device_id xilinx_spi_of_match[] = {
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{ .compatible = "xlnx,xps-spi-2.00.a", },
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{ .compatible = "xlnx,xps-spi-2.00.b", },
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{}
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};
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MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
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static struct of_platform_driver xilinx_spi_of_driver = {
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.owner = THIS_MODULE,
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.name = "xilinx-xps-spi",
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.match_table = xilinx_spi_of_match,
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.probe = xilinx_spi_of_probe,
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.remove = __exit_p(xilinx_spi_of_remove),
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.driver = {
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.name = XILINX_SPI_NAME,
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.name = "xilinx-xps-spi",
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.owner = THIS_MODULE,
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},
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};
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static int __init xilinx_spi_init(void)
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{
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return platform_driver_register(&xilinx_spi_driver);
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return of_register_platform_driver(&xilinx_spi_of_driver);
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}
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module_init(xilinx_spi_init);
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static void __exit xilinx_spi_exit(void)
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{
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platform_driver_unregister(&xilinx_spi_driver);
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of_unregister_platform_driver(&xilinx_spi_of_driver);
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}
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module_exit(xilinx_spi_exit);
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MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
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MODULE_DESCRIPTION("Xilinx SPI driver");
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MODULE_LICENSE("GPL");
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