diff options
Diffstat (limited to 'drivers/ata/pata_of_platform.c')
| -rw-r--r-- | drivers/ata/pata_of_platform.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/ata/pata_of_platform.c b/drivers/ata/pata_of_platform.c new file mode 100644 index 000000000..ac5a633c0 --- /dev/null +++ b/drivers/ata/pata_of_platform.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OF-platform PATA driver + * + * Copyright (c) 2007 MontaVista Software, Inc. + * Anton Vorontsov <avorontsov@ru.mvista.com> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/ata_platform.h> +#include <linux/libata.h> + +#define DRV_NAME "pata_of_platform" + +static struct scsi_host_template pata_platform_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static int pata_of_platform_probe(struct platform_device *ofdev) +{ + int ret; + struct device_node *dn = ofdev->dev.of_node; + struct resource io_res; + struct resource ctl_res; + struct resource irq_res; + unsigned int reg_shift = 0; + int pio_mode = 0; + int pio_mask; + bool use16bit; + int irq; + + ret = of_address_to_resource(dn, 0, &io_res); + if (ret) { + dev_err(&ofdev->dev, "can't get IO address from " + "device tree\n"); + return -EINVAL; + } + + ret = of_address_to_resource(dn, 1, &ctl_res); + if (ret) { + dev_err(&ofdev->dev, "can't get CTL address from " + "device tree\n"); + return -EINVAL; + } + + memset(&irq_res, 0, sizeof(irq_res)); + + irq = platform_get_irq_optional(ofdev, 0); + if (irq < 0 && irq != -ENXIO) + return irq; + if (irq > 0) { + irq_res.start = irq; + irq_res.end = irq; + } + + of_property_read_u32(dn, "reg-shift", ®_shift); + + if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) { + if (pio_mode > 6) { + dev_err(&ofdev->dev, "invalid pio-mode\n"); + return -EINVAL; + } + } else { + dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n"); + } + + use16bit = of_property_read_bool(dn, "ata-generic,use16bit"); + + pio_mask = 1 << pio_mode; + pio_mask |= (1 << pio_mode) - 1; + + return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL, + reg_shift, pio_mask, &pata_platform_sht, + use16bit); +} + +static const struct of_device_id pata_of_platform_match[] = { + { .compatible = "ata-generic", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pata_of_platform_match); + +static struct platform_driver pata_of_platform_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = pata_of_platform_match, + }, + .probe = pata_of_platform_probe, + .remove = ata_platform_remove_one, +}; + +module_platform_driver(pata_of_platform_driver); + +MODULE_DESCRIPTION("OF-platform PATA driver"); +MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); +MODULE_LICENSE("GPL"); |