diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/xilinx_spi.c | 137 |
1 files changed, 81 insertions, 56 deletions
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 68d6f4988fb..fe7e5f35e5d 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -15,12 +15,15 @@ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/platform_device.h> + +#include <linux/of_platform.h> +#include <linux/of_device.h> +#include <linux/of_spi.h> + #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> #include <linux/io.h> -#include <syslib/virtex_devices.h> - #define XILINX_SPI_NAME "xilinx_spi" /* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) @@ -144,23 +147,14 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { u8 bits_per_word; - u32 hz; - struct xilinx_spi *xspi = spi_master_get_devdata(spi->master); bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; - hz = (t) ? t->speed_hz : spi->max_speed_hz; if (bits_per_word != 8) { dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", __func__, bits_per_word); return -EINVAL; } - if (hz && xspi->speed_hz > hz) { - dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n", - __func__, hz); - return -EINVAL; - } - return 0; } @@ -304,32 +298,38 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) return IRQ_HANDLED; } -static int __init xilinx_spi_probe(struct platform_device *dev) +static int __init xilinx_spi_of_probe(struct of_device *ofdev, + const struct of_device_id *match) { - int ret = 0; struct spi_master *master; struct xilinx_spi *xspi; - struct xspi_platform_data *pdata; - struct resource *r; + struct resource r_irq_struct; + struct resource r_mem_struct; + + struct resource *r_irq = &r_irq_struct; + struct resource *r_mem = &r_mem_struct; + int rc = 0; + const u32 *prop; + int len; /* Get resources(memory, IRQ) associated with the device */ - master = spi_alloc_master(&dev->dev, sizeof(struct xilinx_spi)); + master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi)); if (master == NULL) { return -ENOMEM; } - platform_set_drvdata(dev, master); - pdata = dev->dev.platform_data; + dev_set_drvdata(&ofdev->dev, master); - if (pdata == NULL) { - ret = -ENODEV; + rc = of_address_to_resource(ofdev->node, 0, r_mem); + if (rc) { + dev_warn(&ofdev->dev, "invalid address\n"); goto put_master; } - r = platform_get_resource(dev, IORESOURCE_MEM, 0); - if (r == NULL) { - ret = -ENODEV; + rc = of_irq_to_resource(ofdev->node, 0, r_irq); + if (rc == NO_IRQ) { + dev_warn(&ofdev->dev, "no IRQ found\n"); goto put_master; } @@ -341,47 +341,57 @@ static int __init xilinx_spi_probe(struct platform_device *dev) xspi->bitbang.master->setup = xilinx_spi_setup; init_completion(&xspi->done); - if (!request_mem_region(r->start, - r->end - r->start + 1, XILINX_SPI_NAME)) { - ret = -ENXIO; + xspi->irq = r_irq->start; + + if (!request_mem_region(r_mem->start, + r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) { + rc = -ENXIO; + dev_warn(&ofdev->dev, "memory request failure\n"); goto put_master; } - xspi->regs = ioremap(r->start, r->end - r->start + 1); + xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1); if (xspi->regs == NULL) { - ret = -ENOMEM; + rc = -ENOMEM; + dev_warn(&ofdev->dev, "ioremap failure\n"); goto put_master; } + xspi->irq = r_irq->start; - ret = platform_get_irq(dev, 0); - if (ret < 0) { - ret = -ENXIO; - goto unmap_io; - } - xspi->irq = ret; + /* dynamic bus assignment */ + master->bus_num = -1; - master->bus_num = pdata->bus_num; - master->num_chipselect = pdata->num_chipselect; - xspi->speed_hz = pdata->speed_hz; + /* number of slave select bits is required */ + prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len); + if (!prop || len < sizeof(*prop)) { + dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n"); + goto put_master; + } + master->num_chipselect = *prop; /* SPI controller initializations */ xspi_init_hw(xspi->regs); /* Register for SPI Interrupt */ - ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); - if (ret != 0) + rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); + if (rc != 0) { + dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq); goto unmap_io; + } - ret = spi_bitbang_start(&xspi->bitbang); - if (ret != 0) { - dev_err(&dev->dev, "spi_bitbang_start FAILED\n"); + rc = spi_bitbang_start(&xspi->bitbang); + if (rc != 0) { + dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n"); goto free_irq; } - dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", - r->start, (u32)xspi->regs, xspi->irq); + dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", + (unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq); - return ret; + /* Add any subnodes on the SPI bus */ + of_register_spi_devices(master, ofdev->node); + + return rc; free_irq: free_irq(xspi->irq, xspi); @@ -389,21 +399,21 @@ unmap_io: iounmap(xspi->regs); put_master: spi_master_put(master); - return ret; + return rc; } -static int __devexit xilinx_spi_remove(struct platform_device *dev) +static int __devexit xilinx_spi_remove(struct of_device *ofdev) { struct xilinx_spi *xspi; struct spi_master *master; - master = platform_get_drvdata(dev); + master = platform_get_drvdata(ofdev); xspi = spi_master_get_devdata(master); spi_bitbang_stop(&xspi->bitbang); free_irq(xspi->irq, xspi); iounmap(xspi->regs); - platform_set_drvdata(dev, 0); + dev_set_drvdata(&ofdev->dev, 0); spi_master_put(xspi->bitbang.master); return 0; @@ -412,27 +422,42 @@ static int __devexit xilinx_spi_remove(struct platform_device *dev) /* work with hotplug and coldplug */ MODULE_ALIAS("platform:" XILINX_SPI_NAME); -static struct platform_driver xilinx_spi_driver = { - .probe = xilinx_spi_probe, - .remove = __devexit_p(xilinx_spi_remove), +static int __exit xilinx_spi_of_remove(struct of_device *op) +{ + return xilinx_spi_remove(op); +} + +static struct of_device_id xilinx_spi_of_match[] = { + { .compatible = "xlnx,xps-spi-2.00.a", }, + { .compatible = "xlnx,xps-spi-2.00.b", }, + {} +}; + +MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); + +static struct of_platform_driver xilinx_spi_of_driver = { + .owner = THIS_MODULE, + .name = "xilinx-xps-spi", + .match_table = xilinx_spi_of_match, + .probe = xilinx_spi_of_probe, + .remove = __exit_p(xilinx_spi_of_remove), .driver = { - .name = XILINX_SPI_NAME, + .name = "xilinx-xps-spi", .owner = THIS_MODULE, }, }; static int __init xilinx_spi_init(void) { - return platform_driver_register(&xilinx_spi_driver); + return of_register_platform_driver(&xilinx_spi_of_driver); } module_init(xilinx_spi_init); static void __exit xilinx_spi_exit(void) { - platform_driver_unregister(&xilinx_spi_driver); + of_unregister_platform_driver(&xilinx_spi_of_driver); } module_exit(xilinx_spi_exit); - MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); MODULE_DESCRIPTION("Xilinx SPI driver"); MODULE_LICENSE("GPL"); |