[PATCH] ata: Generic platform_device libata driver
needs a changelog Signed-off-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Jeff Garzik <jeff@garzik.org> Cc: Tejun Heo <htejun@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>hifive-unleashed-5.1
Paul Mundt
Jeff Garzik
parent
6919a0a6cf
commit
a20c9e8208
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@ -499,6 +499,15 @@ config PATA_WINBOND_VLB
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Support for the Winbond W83759A controller on Vesa Local Bus
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systems.
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config PATA_PLATFORM
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tristate "Generic platform device PATA support"
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depends on EMBEDDED
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help
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This option enables support for generic directly connected ATA
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devices commonly found on embedded systems.
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If unsure, say N.
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endif
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endmenu
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@ -55,6 +55,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c105.o
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obj-$(CONFIG_PATA_WINBOND_VLB) += pata_winbond.o
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obj-$(CONFIG_PATA_SIS) += pata_sis.o
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obj-$(CONFIG_PATA_TRIFLEX) += pata_triflex.o
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obj-$(CONFIG_PATA_PLATFORM) += pata_platform.o
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# Should be last but one libata driver
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obj-$(CONFIG_ATA_GENERIC) += ata_generic.o
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# Should be last libata driver
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@ -0,0 +1,295 @@
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/*
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* Generic platform device PATA driver
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*
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* Copyright (C) 2006 Paul Mundt
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*
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* Based on pata_pcmcia:
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*
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* Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <scsi/scsi_host.h>
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#include <linux/ata.h>
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#include <linux/libata.h>
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#include <linux/platform_device.h>
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#include <linux/pata_platform.h>
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#define DRV_NAME "pata_platform"
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#define DRV_VERSION "0.1.2"
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static int pio_mask = 1;
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/*
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* Provide our own set_mode() as we don't want to change anything that has
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* already been configured..
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*/
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static void pata_platform_set_mode(struct ata_port *ap)
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{
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int i;
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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struct ata_device *dev = &ap->device[i];
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if (ata_dev_enabled(dev)) {
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/* We don't really care */
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dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
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dev->xfer_shift = ATA_SHIFT_PIO;
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dev->flags |= ATA_DFLAG_PIO;
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}
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}
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}
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static void pata_platform_host_stop(struct ata_host *host)
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{
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int i;
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/*
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* Unmap the bases for MMIO
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*/
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for (i = 0; i < host->n_ports; i++) {
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struct ata_port *ap = host->ports[i];
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if (ap->flags & ATA_FLAG_MMIO) {
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iounmap((void __iomem *)ap->ioaddr.ctl_addr);
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iounmap((void __iomem *)ap->ioaddr.cmd_addr);
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}
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}
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}
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static struct scsi_host_template pata_platform_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.max_sectors = ATA_MAX_SECTORS,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.bios_param = ata_std_bios_param,
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};
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static struct ata_port_operations pata_platform_port_ops = {
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.set_mode = pata_platform_set_mode,
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.port_disable = ata_port_disable,
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = ata_bmdma_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.qc_prep = ata_qc_prep,
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.qc_issue = ata_qc_issue_prot,
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.data_xfer = ata_pio_data_xfer_noirq,
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.port_start = ata_port_start,
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.port_stop = ata_port_stop,
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.host_stop = pata_platform_host_stop
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};
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static void pata_platform_setup_port(struct ata_ioports *ioaddr,
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struct pata_platform_info *info)
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{
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unsigned int shift = 0;
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/* Fixup the port shift for platforms that need it */
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if (info && info->ioport_shift)
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shift = info->ioport_shift;
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ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
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ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
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ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
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ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
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ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
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ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
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ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
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ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
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ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
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ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
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}
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/**
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* pata_platform_probe - attach a platform interface
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* @pdev: platform device
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*
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* Register a platform bus IDE interface. Such interfaces are PIO and we
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* assume do not support IRQ sharing.
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*
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* Platform devices are expected to contain 3 resources per port:
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*
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* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
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* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
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* - IRQ (IORESOURCE_IRQ)
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*
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* If the base resources are both mem types, the ioremap() is handled
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* here. For IORESOURCE_IO, it's assumed that there's no remapping
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* necessary.
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*/
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static int __devinit pata_platform_probe(struct platform_device *pdev)
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{
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struct resource *io_res, *ctl_res;
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struct ata_probe_ent ae;
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unsigned int mmio;
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int ret;
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/*
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* Simple resource validation ..
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*/
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if (unlikely(pdev->num_resources != 3)) {
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dev_err(&pdev->dev, "invalid number of resources\n");
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return -EINVAL;
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}
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/*
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* Get the I/O base first
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*/
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io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (io_res == NULL) {
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io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(io_res == NULL))
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return -EINVAL;
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}
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/*
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* Then the CTL base
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*/
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ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
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if (ctl_res == NULL) {
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ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (unlikely(ctl_res == NULL))
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return -EINVAL;
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}
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/*
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* Check for MMIO
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*/
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mmio = (( io_res->flags == IORESOURCE_MEM) &&
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(ctl_res->flags == IORESOURCE_MEM));
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/*
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* Now that that's out of the way, wire up the port..
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*/
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memset(&ae, 0, sizeof(struct ata_probe_ent));
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INIT_LIST_HEAD(&ae.node);
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ae.dev = &pdev->dev;
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ae.port_ops = &pata_platform_port_ops;
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ae.sht = &pata_platform_sht;
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ae.n_ports = 1;
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ae.pio_mask = pio_mask;
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ae.irq = platform_get_irq(pdev, 0);
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ae.irq_flags = 0;
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ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
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/*
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* Handle the MMIO case
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*/
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if (mmio) {
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ae.port_flags |= ATA_FLAG_MMIO;
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ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start,
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io_res->end - io_res->start + 1);
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if (unlikely(!ae.port[0].cmd_addr)) {
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dev_err(&pdev->dev, "failed to remap IO base\n");
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return -ENXIO;
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}
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ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start,
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ctl_res->end - ctl_res->start + 1);
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if (unlikely(!ae.port[0].ctl_addr)) {
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dev_err(&pdev->dev, "failed to remap CTL base\n");
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ret = -ENXIO;
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goto bad_remap;
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}
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} else {
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ae.port[0].cmd_addr = io_res->start;
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ae.port[0].ctl_addr = ctl_res->start;
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}
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ae.port[0].altstatus_addr = ae.port[0].ctl_addr;
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pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data);
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if (unlikely(ata_device_add(&ae) == 0)) {
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ret = -ENODEV;
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goto add_failed;
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}
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return 0;
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add_failed:
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if (ae.port[0].ctl_addr && mmio)
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iounmap((void __iomem *)ae.port[0].ctl_addr);
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bad_remap:
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if (ae.port[0].cmd_addr && mmio)
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iounmap((void __iomem *)ae.port[0].cmd_addr);
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return ret;
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}
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/**
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* pata_platform_remove - unplug a platform interface
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* @pdev: platform device
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*
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* A platform bus ATA device has been unplugged. Perform the needed
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* cleanup. Also called on module unload for any active devices.
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*/
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static int __devexit pata_platform_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ata_host *host = dev_get_drvdata(dev);
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ata_host_remove(host);
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dev_set_drvdata(dev, NULL);
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return 0;
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}
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static struct platform_driver pata_platform_driver = {
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.probe = pata_platform_probe,
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.remove = __devexit_p(pata_platform_remove),
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init pata_platform_init(void)
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{
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return platform_driver_register(&pata_platform_driver);
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}
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static void __exit pata_platform_exit(void)
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{
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platform_driver_unregister(&pata_platform_driver);
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}
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module_init(pata_platform_init);
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module_exit(pata_platform_exit);
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module_param(pio_mask, int, 0);
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MODULE_AUTHOR("Paul Mundt");
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MODULE_DESCRIPTION("low-level driver for platform device ATA");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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@ -0,0 +1,13 @@
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#ifndef __LINUX_PATA_PLATFORM_H
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#define __LINUX_PATA_PLATFORM_H
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struct pata_platform_info {
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/*
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* I/O port shift, for platforms with ports that are
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* constantly spaced and need larger than the 1-byte
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* spacing used by ata_std_ports().
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*/
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unsigned int ioport_shift;
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};
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#endif /* __LINUX_PATA_PLATFORM_H */
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