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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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24dc5f33ea
Update libata LLDs to use devres. Core layer is already converted to
support managed LLDs. This patch simplifies initialization and fixes
many resource related bugs in init failure and detach path. For
example, all converted drivers now handle ata_device_add() failure
gracefully without excessive resource rollback code.
As most resources are released automatically on driver detach, many
drivers don't need or can do with much simpler ->{port|host}_stop().
In general, stop callbacks are need iff port or host needs to be given
commands to shut it down. Note that freezing is enough in many cases
and ports are automatically frozen before being detached.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
256 lines
7.3 KiB
C
256 lines
7.3 KiB
C
/*
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* ata_generic.c - Generic PATA/SATA controller driver.
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* Copyright 2005 Red Hat Inc <alan@redhat.com>, all rights reserved.
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*
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* Elements from ide/pci/generic.c
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* Copyright (C) 2001-2002 Andre Hedrick <andre@linux-ide.org>
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* Portions (C) Copyright 2002 Red Hat Inc <alan@redhat.com>
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*
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* May be copied or modified under the terms of the GNU General Public License
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*
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* Driver for PCI IDE interfaces implementing the standard bus mastering
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* interface functionality. This assumes the BIOS did the drive set up and
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* tuning for us. By default we do not grab all IDE class devices as they
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* may have other drivers or need fixups to avoid problems. Instead we keep
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* a default list of stuff without documentation/driver that appears to
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* work.
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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/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#define DRV_NAME "ata_generic"
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#define DRV_VERSION "0.2.10"
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/*
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* A generic parallel ATA driver using libata
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*/
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/**
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* generic_pre_reset - probe begin
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* @ap: ATA port
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*
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* Set up cable type and use generic probe init
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*/
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static int generic_pre_reset(struct ata_port *ap)
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{
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ap->cbl = ATA_CBL_PATA80;
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return ata_std_prereset(ap);
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}
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/**
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* generic_error_handler - Probe specified port on PATA host controller
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* @ap: Port to probe
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* @classes:
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void generic_error_handler(struct ata_port *ap)
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{
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ata_bmdma_drive_eh(ap, generic_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
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}
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/**
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* generic_set_mode - mode setting
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* @ap: interface to set up
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* @unused: returned device on error
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*
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* Use a non standard set_mode function. We don't want to be tuned.
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* The BIOS configured everything. Our job is not to fiddle. We
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* read the dma enabled bits from the PCI configuration of the device
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* and respect them.
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*/
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static int generic_set_mode(struct ata_port *ap, struct ata_device **unused)
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{
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int dma_enabled = 0;
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int i;
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/* Bits 5 and 6 indicate if DMA is active on master/slave */
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if (ap->ioaddr.bmdma_addr)
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dma_enabled = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
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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_ready(dev)) {
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/* We don't really care */
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dev->pio_mode = XFER_PIO_0;
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dev->dma_mode = XFER_MW_DMA_0;
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/* We do need the right mode information for DMA or PIO
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and this comes from the current configuration flags */
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if (dma_enabled & (1 << (5 + i))) {
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dev->xfer_mode = XFER_MW_DMA_0;
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dev->xfer_shift = ATA_SHIFT_MWDMA;
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dev->flags &= ~ATA_DFLAG_PIO;
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} else {
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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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return 0;
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}
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static struct scsi_host_template generic_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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.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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.slave_destroy = ata_scsi_slave_destroy,
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.bios_param = ata_std_bios_param,
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.resume = ata_scsi_device_resume,
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.suspend = ata_scsi_device_suspend,
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};
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static struct ata_port_operations generic_port_ops = {
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.set_mode = generic_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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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.data_xfer = ata_pio_data_xfer,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = generic_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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.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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};
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static int all_generic_ide; /* Set to claim all devices */
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/**
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* ata_generic_init - attach generic IDE
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* @dev: PCI device found
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* @id: match entry
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*
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* Called each time a matching IDE interface is found. We check if the
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* interface is one we wish to claim and if so we perform any chip
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* specific hacks then let the ATA layer do the heavy lifting.
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*/
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static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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u16 command;
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static struct ata_port_info info = {
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.sht = &generic_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.udma_mask = 0x3f,
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.port_ops = &generic_port_ops
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};
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static struct ata_port_info *port_info[2] = { &info, &info };
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/* Don't use the generic entry unless instructed to do so */
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if (id->driver_data == 1 && all_generic_ide == 0)
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return -ENODEV;
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/* Devices that need care */
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if (dev->vendor == PCI_VENDOR_ID_UMC &&
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dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
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(!(PCI_FUNC(dev->devfn) & 1)))
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return -ENODEV;
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if (dev->vendor == PCI_VENDOR_ID_OPTI &&
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dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
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(!(PCI_FUNC(dev->devfn) & 1)))
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return -ENODEV;
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/* Don't re-enable devices in generic mode or we will break some
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motherboards with disabled and unused IDE controllers */
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pci_read_config_word(dev, PCI_COMMAND, &command);
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if (!(command & PCI_COMMAND_IO))
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return -ENODEV;
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if (dev->vendor == PCI_VENDOR_ID_AL)
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ata_pci_clear_simplex(dev);
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return ata_pci_init_one(dev, port_info, 2);
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}
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static struct pci_device_id ata_generic[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
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{ PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
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{ PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8673F), },
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{ PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886A), },
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{ PCI_DEVICE(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF), },
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{ PCI_DEVICE(PCI_VENDOR_ID_HINT, PCI_DEVICE_ID_HINT_VXPROII_IDE), },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C561), },
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{ PCI_DEVICE(PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C558), },
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{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO), },
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{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
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{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2), },
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/* Must come last. If you add entries adjust this table appropriately */
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{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
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{ 0, },
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};
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static struct pci_driver ata_generic_pci_driver = {
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.name = DRV_NAME,
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.id_table = ata_generic,
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.probe = ata_generic_init_one,
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.remove = ata_pci_remove_one,
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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};
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static int __init ata_generic_init(void)
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{
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return pci_register_driver(&ata_generic_pci_driver);
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}
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static void __exit ata_generic_exit(void)
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{
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pci_unregister_driver(&ata_generic_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for generic ATA");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, ata_generic);
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MODULE_VERSION(DRV_VERSION);
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module_init(ata_generic_init);
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module_exit(ata_generic_exit);
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module_param(all_generic_ide, int, 0);
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