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/*
* sata_svw.c - ServerWorks / Apple K2 SATA
*
* Maintained by: Benjamin Herrenschmidt <benh@kernel.crashing.org> and
* Jeff Garzik <jgarzik@pobox.com>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
*
* Bits from Jeff Garzik, Copyright RedHat, Inc.
*
* This driver probably works with non-Apple versions of the
* Broadcom chipset...
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware documentation available under NDA.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#ifdef CONFIG_PPC_OF
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#endif /* CONFIG_PPC_OF */
#define DRV_NAME "sata_svw"
#define DRV_VERSION "1.06"
/* Taskfile registers offsets */
#define K2_SATA_TF_CMD_OFFSET 0x00
#define K2_SATA_TF_DATA_OFFSET 0x00
#define K2_SATA_TF_ERROR_OFFSET 0x04
#define K2_SATA_TF_NSECT_OFFSET 0x08
#define K2_SATA_TF_LBAL_OFFSET 0x0c
#define K2_SATA_TF_LBAM_OFFSET 0x10
#define K2_SATA_TF_LBAH_OFFSET 0x14
#define K2_SATA_TF_DEVICE_OFFSET 0x18
#define K2_SATA_TF_CMDSTAT_OFFSET 0x1c
#define K2_SATA_TF_CTL_OFFSET 0x20
/* DMA base */
#define K2_SATA_DMA_CMD_OFFSET 0x30
/* SCRs base */
#define K2_SATA_SCR_STATUS_OFFSET 0x40
#define K2_SATA_SCR_ERROR_OFFSET 0x44
#define K2_SATA_SCR_CONTROL_OFFSET 0x48
/* Others */
#define K2_SATA_SICR1_OFFSET 0x80
#define K2_SATA_SICR2_OFFSET 0x84
#define K2_SATA_SIM_OFFSET 0x88
/* Port stride */
#define K2_SATA_PORT_OFFSET 0x100
static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
{
if (sc_reg > SCR_CONTROL)
return 0xffffffffU;
return readl((void *) ap->ioaddr.scr_addr + (sc_reg * 4));
}
static void k2_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
u32 val)
{
if (sc_reg > SCR_CONTROL)
return;
writel(val, (void *) ap->ioaddr.scr_addr + (sc_reg * 4));
}
static void k2_sata_tf_load(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
writeb(tf->ctl, ioaddr->ctl_addr);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
} else if (is_addr) {
writew(tf->feature, ioaddr->feature_addr);
writew(tf->nsect, ioaddr->nsect_addr);
writew(tf->lbal, ioaddr->lbal_addr);
writew(tf->lbam, ioaddr->lbam_addr);
writew(tf->lbah, ioaddr->lbah_addr);
}
if (tf->flags & ATA_TFLAG_DEVICE)
writeb(tf->device, ioaddr->device_addr);
ata_wait_idle(ap);
}
static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u16 nsect, lbal, lbam, lbah;
nsect = tf->nsect = readw(ioaddr->nsect_addr);
lbal = tf->lbal = readw(ioaddr->lbal_addr);
lbam = tf->lbam = readw(ioaddr->lbam_addr);
lbah = tf->lbah = readw(ioaddr->lbah_addr);
tf->device = readw(ioaddr->device_addr);
if (tf->flags & ATA_TFLAG_LBA48) {
tf->hob_feature = readw(ioaddr->error_addr) >> 8;
tf->hob_nsect = nsect >> 8;
tf->hob_lbal = lbal >> 8;
tf->hob_lbam = lbam >> 8;
tf->hob_lbah = lbah >> 8;
}
}
/**
* k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
u8 dmactl;
void *mmio = (void *) ap->ioaddr.bmdma_addr;
/* load PRD table addr. */
mb(); /* make sure PRD table writes are visible to controller */
writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
/* specify data direction, triple-check start bit is clear */
dmactl = readb(mmio + ATA_DMA_CMD);
dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
if (!rw)
dmactl |= ATA_DMA_WR;
writeb(dmactl, mmio + ATA_DMA_CMD);
/* issue r/w command if this is not a ATA DMA command*/
if (qc->tf.protocol != ATA_PROT_DMA)
ap->ops->exec_command(ap, &qc->tf);
}
/**
* k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
* @qc: Info associated with this ATA transaction.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void *mmio = (void *) ap->ioaddr.bmdma_addr;
u8 dmactl;
/* start host DMA transaction */
dmactl = readb(mmio + ATA_DMA_CMD);
writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
/* There is a race condition in certain SATA controllers that can
be seen when the r/w command is given to the controller before the
host DMA is started. On a Read command, the controller would initiate
the command to the drive even before it sees the DMA start. When there
are very fast drives connected to the controller, or when the data request
hits in the drive cache, there is the possibility that the drive returns a part
or all of the requested data to the controller before the DMA start is issued.
In this case, the controller would become confused as to what to do with the data.
In the worst case when all the data is returned back to the controller, the
controller could hang. In other cases it could return partial data returning
in data corruption. This problem has been seen in PPC systems and can also appear
on an system with very fast disks, where the SATA controller is sitting behind a
number of bridges, and hence there is significant latency between the r/w command
and the start command. */
/* issue r/w command if the access is to ATA*/
if (qc->tf.protocol == ATA_PROT_DMA)
ap->ops->exec_command(ap, &qc->tf);
}
static u8 k2_stat_check_status(struct ata_port *ap)
{
return readl((void *) ap->ioaddr.status_addr);
}
#ifdef CONFIG_PPC_OF
/*
* k2_sata_proc_info
* inout : decides on the direction of the dataflow and the meaning of the
* variables
* buffer: If inout==FALSE data is being written to it else read from it
* *start: If inout==FALSE start of the valid data in the buffer
* offset: If inout==FALSE offset from the beginning of the imaginary file
* from which we start writing into the buffer
* length: If inout==FALSE max number of bytes to be written into the buffer
* else number of bytes in the buffer
*/
static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
off_t offset, int count, int inout)
{
struct ata_port *ap;
struct device_node *np;
int len, index;
/* Find the ata_port */
ap = (struct ata_port *) &shost->hostdata[0];
if (ap == NULL)
return 0;
/* Find the OF node for the PCI device proper */
np = pci_device_to_OF_node(to_pci_dev(ap->host_set->dev));
if (np == NULL)
return 0;
/* Match it to a port node */
index = (ap == ap->host_set->ports[0]) ? 0 : 1;
for (np = np->child; np != NULL;
|