diff options
| -rw-r--r-- | drivers/ata/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/ata/Makefile | 1 | ||||
| -rw-r--r-- | drivers/ata/pata_platform.c | 295 | ||||
| -rw-r--r-- | include/linux/pata_platform.h | 13 |
4 files changed, 318 insertions, 0 deletions
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index 9b07e70bee7..98d0f01c90e 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -499,6 +499,15 @@ config PATA_WINBOND_VLB Support for the Winbond W83759A controller on Vesa Local Bus systems. +config PATA_PLATFORM + tristate "Generic platform device PATA support" + depends on EMBEDDED + help + This option enables support for generic directly connected ATA + devices commonly found on embedded systems. + + If unsure, say N. + endif endmenu diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index ceba7d824a6..f2b3ea2d15d 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -55,6 +55,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c105.o obj-$(CONFIG_PATA_WINBOND_VLB) += pata_winbond.o obj-$(CONFIG_PATA_SIS) += pata_sis.o obj-$(CONFIG_PATA_TRIFLEX) += pata_triflex.o +obj-$(CONFIG_PATA_PLATFORM) += pata_platform.o # Should be last but one libata driver obj-$(CONFIG_ATA_GENERIC) += ata_generic.o # Should be last libata driver diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c new file mode 100644 index 00000000000..63d6687f0ba --- /dev/null +++ b/drivers/ata/pata_platform.c @@ -0,0 +1,295 @@ +/* + * Generic platform device PATA driver + * + * Copyright (C) 2006 Paul Mundt + * + * Based on pata_pcmcia: + * + * Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <scsi/scsi_host.h> +#include <linux/ata.h> +#include <linux/libata.h> +#include <linux/platform_device.h> +#include <linux/pata_platform.h> + +#define DRV_NAME "pata_platform" +#define DRV_VERSION "0.1.2" + +static int pio_mask = 1; + +/* + * Provide our own set_mode() as we don't want to change anything that has + * already been configured.. + */ +static void pata_platform_set_mode(struct ata_port *ap) +{ + int i; + + for (i = 0; i < ATA_MAX_DEVICES; i++) { + struct ata_device *dev = &ap->device[i]; + + if (ata_dev_enabled(dev)) { + /* We don't really care */ + dev->pio_mode = dev->xfer_mode = XFER_PIO_0; + dev->xfer_shift = ATA_SHIFT_PIO; + dev->flags |= ATA_DFLAG_PIO; + } + } +} + +static void pata_platform_host_stop(struct ata_host *host) +{ + int i; + + /* + * Unmap the bases for MMIO + */ + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + + if (ap->flags & ATA_FLAG_MMIO) { + iounmap((void __iomem *)ap->ioaddr.ctl_addr); + iounmap((void __iomem *)ap->ioaddr.cmd_addr); + } + } +} + +static struct scsi_host_template pata_platform_sht = { + .module = THIS_MODULE, + .name = DRV_NAME, + .ioctl = ata_scsi_ioctl, + .queuecommand = ata_scsi_queuecmd, + .can_queue = ATA_DEF_QUEUE, + .this_id = ATA_SHT_THIS_ID, + .sg_tablesize = LIBATA_MAX_PRD, + .max_sectors = ATA_MAX_SECTORS, + .cmd_per_lun = ATA_SHT_CMD_PER_LUN, + .emulated = ATA_SHT_EMULATED, + .use_clustering = ATA_SHT_USE_CLUSTERING, + .proc_name = DRV_NAME, + .dma_boundary = ATA_DMA_BOUNDARY, + .slave_configure = ata_scsi_slave_config, + .bios_param = ata_std_bios_param, +}; + +static struct ata_port_operations pata_platform_port_ops = { + .set_mode = pata_platform_set_mode, + + .port_disable = ata_port_disable, + .tf_load = ata_tf_load, + .tf_read = ata_tf_read, + .check_status = ata_check_status, + .exec_command = ata_exec_command, + .dev_select = ata_std_dev_select, + + .freeze = ata_bmdma_freeze, + .thaw = ata_bmdma_thaw, + .error_handler = ata_bmdma_error_handler, + .post_internal_cmd = ata_bmdma_post_internal_cmd, + + .qc_prep = ata_qc_prep, + .qc_issue = ata_qc_issue_prot, + + .data_xfer = ata_pio_data_xfer_noirq, + + .irq_handler = ata_interrupt, + .irq_clear = ata_bmdma_irq_clear, + + .port_start = ata_port_start, + .port_stop = ata_port_stop, + .host_stop = pata_platform_host_stop +}; + +static void pata_platform_setup_port(struct ata_ioports *ioaddr, + struct pata_platform_info *info) +{ + unsigned int shift = 0; + + /* Fixup the port shift for platforms that need it */ + if (info && info->ioport_shift) + shift = info->ioport_shift; + + ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); + ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); + ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); + ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); + ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); + ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); + ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); + ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); + ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); + ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); +} + +/** + * pata_platform_probe - attach a platform interface + * @pdev: platform device + * + * Register a platform bus IDE interface. Such interfaces are PIO and we + * assume do not support IRQ sharing. + * + * Platform devices are expected to contain 3 resources per port: + * + * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) + * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) + * - IRQ (IORESOURCE_IRQ) + * + * If the base resources are both mem types, the ioremap() is handled + * here. For IORESOURCE_IO, it's assumed that there's no remapping + * necessary. + */ +static int __devinit pata_platform_probe(struct platform_device *pdev) +{ + struct resource *io_res, *ctl_res; + struct ata_probe_ent ae; + unsigned int mmio; + int ret; + + /* + * Simple resource validation .. + */ + if (unlikely(pdev->num_resources != 3)) { + dev_err(&pdev->dev, "invalid number of resources\n"); + return -EINVAL; + } + + /* + * Get the I/O base first + */ + io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (io_res == NULL) { + io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(io_res == NULL)) + return -EINVAL; + } + + /* + * Then the CTL base + */ + ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); + if (ctl_res == NULL) { + ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (unlikely(ctl_res == NULL)) + return -EINVAL; + } + + /* + * Check for MMIO + */ + mmio = (( io_res->flags == IORESOURCE_MEM) && + (ctl_res->flags == IORESOURCE_MEM)); + + /* + * Now that that's out of the way, wire up the port.. + */ + memset(&ae, 0, sizeof(struct ata_probe_ent)); + INIT_LIST_HEAD(&ae.node); + ae.dev = &pdev->dev; + ae.port_ops = &pata_platform_port_ops; + ae.sht = &pata_platform_sht; + ae.n_ports = 1; + ae.pio_mask = pio_mask; + ae.irq = platform_get_irq(pdev, 0); + ae.irq_flags = 0; + ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST; + + /* + * Handle the MMIO case + */ + if (mmio) { + ae.port_flags |= ATA_FLAG_MMIO; + + ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start, + io_res->end - io_res->start + 1); + if (unlikely(!ae.port[0].cmd_addr)) { + dev_err(&pdev->dev, "failed to remap IO base\n"); + return -ENXIO; + } + + ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start, + ctl_res->end - ctl_res->start + 1); + if (unlikely(!ae.port[0].ctl_addr)) { + dev_err(&pdev->dev, "failed to remap CTL base\n"); + ret = -ENXIO; + goto bad_remap; + } + } else { + ae.port[0].cmd_addr = io_res->start; + ae.port[0].ctl_addr = ctl_res->start; + } + + ae.port[0].altstatus_addr = ae.port[0].ctl_addr; + + pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data); + + if (unlikely(ata_device_add(&ae) == 0)) { + ret = -ENODEV; + goto add_failed; + } + + return 0; + +add_failed: + if (ae.port[0].ctl_addr && mmio) + iounmap((void __iomem *)ae.port[0].ctl_addr); +bad_remap: + if (ae.port[0].cmd_addr && mmio) + iounmap((void __iomem *)ae.port[0].cmd_addr); + + return ret; +} + +/** + * pata_platform_remove - unplug a platform interface + * @pdev: platform device + * + * A platform bus ATA device has been unplugged. Perform the needed + * cleanup. Also called on module unload for any active devices. + */ +static int __devexit pata_platform_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ata_host *host = dev_get_drvdata(dev); + + ata_host_remove(host); + dev_set_drvdata(dev, NULL); + + return 0; +} + +static struct platform_driver pata_platform_driver = { + .probe = pata_platform_probe, + .remove = __devexit_p(pata_platform_remove), + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init pata_platform_init(void) +{ + return platform_driver_register(&pata_platform_driver); +} + +static void __exit pata_platform_exit(void) +{ + platform_driver_unregister(&pata_platform_driver); +} +module_init(pata_platform_init); +module_exit(pata_platform_exit); + +module_param(pio_mask, int, 0); + +MODULE_AUTHOR("Paul Mundt"); +MODULE_DESCRIPTION("low-level driver for platform device ATA"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); diff --git a/include/linux/pata_platform.h b/include/linux/pata_platform.h new file mode 100644 index 00000000000..2d5fd647e0e --- /dev/null +++ b/include/linux/pata_platform.h @@ -0,0 +1,13 @@ +#ifndef __LINUX_PATA_PLATFORM_H +#define __LINUX_PATA_PLATFORM_H + +struct pata_platform_info { + /* + * I/O port shift, for platforms with ports that are + * constantly spaced and need larger than the 1-byte + * spacing used by ata_std_ports(). + */ + unsigned int ioport_shift; +}; + +#endif /* __LINUX_PATA_PLATFORM_H */ |