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linux/drivers/ata/sata_inic162x.c
Tejun Heo c7087652e1 libata-sff: clean up BMDMA initialization 
When BMDMA initialization failed or BMDMA was not available for
whatever reason, bmdma_addr was left at zero and used as an indication
that BMDMA shouldn't be used.  This leads to the following problems.

p1. For BMDMA drivers which don't use traditional BMDMA register,
    ata_bmdma_mode_filter() incorrectly inhibits DMA modes.  Those
    drivers either have to inherit from ata_sff_port_ops or clear
    ->mode_filter explicitly.

p2. non-BMDMA drivers call into BMDMA PRD table allocation.  It
    doesn't actually allocate PRD table if bmdma_addr is not
    initialized but is still confusing.

p3. For BMDMA drivers which don't use traditional BMDMA register, some
    methods might not be invoked as expected (e.g. bmdma_stop from
    ata_sff_post_internal_cmd()).

p4. SFF drivers w/ custom DMA interface implement noop BMDMA ops
    worrying libata core might call into one of them.

These problems are caused by the muddy line between SFF and BMDMA and
the assumption that all BMDMA controllers initialize bmdma_addr.

This patch fixes p1 and p2 by removing the bmdma_addr assumption and
moving prd allocation to BMDMA port start.  Later patches will fix the
remaining issues.

This patch improves BMDMA initialization such that

* When BMDMA register initialization fails, falls back to PIO instead
  of failing.  ata_pci_bmdma_init() never fails now.

* When ata_pci_bmdma_init() falls back to PIO, it clears
  ap->mwdma_mask and udma_mask instead of depending on
  ata_bmdma_mode_filter().  This makes ata_bmdma_mode_filter()
  unnecessary thus resolving p1.

* ata_port_start() which actually is BMDMA specific is moved to
  ata_bmdma_port_start().  ata_port_start() and ata_sff_port_start()
  are killed.

* ata_sff_port_start32() is moved and renamed to
  ata_bmdma_port_start32().

Drivers which no longer call into PRD table allocation are...

  pdc_adma, sata_inic162x, sata_qstor, sata_sx4, pata_cmd640 and all
  drivers which inherit from ata_sff_port_ops.

pata_icside sets ->port_start to ATA_OP_NULL as it doesn't need PRD
but is a BMDMA controller and doesn't have custom port_start like
other such controllers.

Note that with the previous patch which makes all and only BMDMA
drivers inherit from ata_bmdma_port_ops, this change doesn't break
drivers which need PRD table.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2010-05-19 13:32:19 -04:00

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/*
* sata_inic162x.c - Driver for Initio 162x SATA controllers
*
* Copyright 2006 SUSE Linux Products GmbH
* Copyright 2006 Tejun Heo <teheo@novell.com>
*
* This file is released under GPL v2.
*
* This controller is eccentric and easily locks up if something isn't
* right. Documentation is available at initio's website but it only
* documents registers (not programming model).
*
* This driver has interesting history. The first version was written
* from the documentation and a 2.4 IDE driver posted on a Taiwan
* company, which didn't use any IDMA features and couldn't handle
* LBA48. The resulting driver couldn't handle LBA48 devices either
* making it pretty useless.
*
* After a while, initio picked the driver up, renamed it to
* sata_initio162x, updated it to use IDMA for ATA DMA commands and
* posted it on their website. It only used ATA_PROT_DMA for IDMA and
* attaching both devices and issuing IDMA and !IDMA commands
* simultaneously broke it due to PIRQ masking interaction but it did
* show how to use the IDMA (ADMA + some initio specific twists)
* engine.
*
* Then, I picked up their changes again and here's the usable driver
* which uses IDMA for everything. Everything works now including
* LBA48, CD/DVD burning, suspend/resume and hotplug. There are some
* issues tho. Result Tf is not resported properly, NCQ isn't
* supported yet and CD/DVD writing works with DMA assisted PIO
* protocol (which, for native SATA devices, shouldn't cause any
* noticeable difference).
*
* Anyways, so, here's finally a working driver for inic162x. Enjoy!
*
* initio: If you guys wanna improve the driver regarding result TF
* access and other stuff, please feel free to contact me. I'll be
* happy to assist.
*/
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/blkdev.h>
#include <scsi/scsi_device.h>
#define DRV_NAME "sata_inic162x"
#define DRV_VERSION "0.4"
enum {
MMIO_BAR_PCI = 5,
MMIO_BAR_CARDBUS = 1,
NR_PORTS = 2,
IDMA_CPB_TBL_SIZE = 4 * 32,
INIC_DMA_BOUNDARY = 0xffffff,
HOST_ACTRL = 0x08,
HOST_CTL = 0x7c,
HOST_STAT = 0x7e,
HOST_IRQ_STAT = 0xbc,
HOST_IRQ_MASK = 0xbe,
PORT_SIZE = 0x40,
/* registers for ATA TF operation */
PORT_TF_DATA = 0x00,
PORT_TF_FEATURE = 0x01,
PORT_TF_NSECT = 0x02,
PORT_TF_LBAL = 0x03,
PORT_TF_LBAM = 0x04,
PORT_TF_LBAH = 0x05,
PORT_TF_DEVICE = 0x06,
PORT_TF_COMMAND = 0x07,
PORT_TF_ALT_STAT = 0x08,
PORT_IRQ_STAT = 0x09,
PORT_IRQ_MASK = 0x0a,
PORT_PRD_CTL = 0x0b,
PORT_PRD_ADDR = 0x0c,
PORT_PRD_XFERLEN = 0x10,
PORT_CPB_CPBLAR = 0x18,
PORT_CPB_PTQFIFO = 0x1c,
/* IDMA register */
PORT_IDMA_CTL = 0x14,
PORT_IDMA_STAT = 0x16,
PORT_RPQ_FIFO = 0x1e,
PORT_RPQ_CNT = 0x1f,
PORT_SCR = 0x20,
/* HOST_CTL bits */
HCTL_LEDEN = (1 << 3), /* enable LED operation */
HCTL_IRQOFF = (1 << 8), /* global IRQ off */
HCTL_FTHD0 = (1 << 10), /* fifo threshold 0 */
HCTL_FTHD1 = (1 << 11), /* fifo threshold 1*/
HCTL_PWRDWN = (1 << 12), /* power down PHYs */
HCTL_SOFTRST = (1 << 13), /* global reset (no phy reset) */
HCTL_RPGSEL = (1 << 15), /* register page select */
HCTL_KNOWN_BITS = HCTL_IRQOFF | HCTL_PWRDWN | HCTL_SOFTRST |
HCTL_RPGSEL,
/* HOST_IRQ_(STAT|MASK) bits */
HIRQ_PORT0 = (1 << 0),
HIRQ_PORT1 = (1 << 1),
HIRQ_SOFT = (1 << 14),
HIRQ_GLOBAL = (1 << 15), /* STAT only */
/* PORT_IRQ_(STAT|MASK) bits */
PIRQ_OFFLINE = (1 << 0), /* device unplugged */
PIRQ_ONLINE = (1 << 1), /* device plugged */
PIRQ_COMPLETE = (1 << 2), /* completion interrupt */
PIRQ_FATAL = (1 << 3), /* fatal error */
PIRQ_ATA = (1 << 4), /* ATA interrupt */
PIRQ_REPLY = (1 << 5), /* reply FIFO not empty */
PIRQ_PENDING = (1 << 7), /* port IRQ pending (STAT only) */
PIRQ_ERR = PIRQ_OFFLINE | PIRQ_ONLINE | PIRQ_FATAL,
PIRQ_MASK_DEFAULT = PIRQ_REPLY | PIRQ_ATA,
PIRQ_MASK_FREEZE = 0xff,
/* PORT_PRD_CTL bits */
PRD_CTL_START = (1 << 0),
PRD_CTL_WR = (1 << 3),
PRD_CTL_DMAEN = (1 << 7), /* DMA enable */
/* PORT_IDMA_CTL bits */
IDMA_CTL_RST_ATA = (1 << 2), /* hardreset ATA bus */
IDMA_CTL_RST_IDMA = (1 << 5), /* reset IDMA machinary */
IDMA_CTL_GO = (1 << 7), /* IDMA mode go */
IDMA_CTL_ATA_NIEN = (1 << 8), /* ATA IRQ disable */
/* PORT_IDMA_STAT bits */
IDMA_STAT_PERR = (1 << 0), /* PCI ERROR MODE */
IDMA_STAT_CPBERR = (1 << 1), /* ADMA CPB error */
IDMA_STAT_LGCY = (1 << 3), /* ADMA legacy */
IDMA_STAT_UIRQ = (1 << 4), /* ADMA unsolicited irq */
IDMA_STAT_STPD = (1 << 5), /* ADMA stopped */
IDMA_STAT_PSD = (1 << 6), /* ADMA pause */
IDMA_STAT_DONE = (1 << 7), /* ADMA done */
IDMA_STAT_ERR = IDMA_STAT_PERR | IDMA_STAT_CPBERR,
/* CPB Control Flags*/
CPB_CTL_VALID = (1 << 0), /* CPB valid */
CPB_CTL_QUEUED = (1 << 1), /* queued command */
CPB_CTL_DATA = (1 << 2), /* data, rsvd in datasheet */
CPB_CTL_IEN = (1 << 3), /* PCI interrupt enable */
CPB_CTL_DEVDIR = (1 << 4), /* device direction control */
/* CPB Response Flags */
CPB_RESP_DONE = (1 << 0), /* ATA command complete */
CPB_RESP_REL = (1 << 1), /* ATA release */
CPB_RESP_IGNORED = (1 << 2), /* CPB ignored */
CPB_RESP_ATA_ERR = (1 << 3), /* ATA command error */
CPB_RESP_SPURIOUS = (1 << 4), /* ATA spurious interrupt error */
CPB_RESP_UNDERFLOW = (1 << 5), /* APRD deficiency length error */
CPB_RESP_OVERFLOW = (1 << 6), /* APRD exccess length error */
CPB_RESP_CPB_ERR = (1 << 7), /* CPB error flag */
/* PRD Control Flags */
PRD_DRAIN = (1 << 1), /* ignore data excess */
PRD_CDB = (1 << 2), /* atapi packet command pointer */
PRD_DIRECT_INTR = (1 << 3), /* direct interrupt */
PRD_DMA = (1 << 4), /* data transfer method */
PRD_WRITE = (1 << 5), /* data dir, rsvd in datasheet */
PRD_IOM = (1 << 6), /* io/memory transfer */
PRD_END = (1 << 7), /* APRD chain end */
};
/* Comman Parameter Block */
struct inic_cpb {
u8 resp_flags; /* Response Flags */
u8 error; /* ATA Error */
u8 status; /* ATA Status */
u8 ctl_flags; /* Control Flags */
__le32 len; /* Total Transfer Length */
__le32 prd; /* First PRD pointer */
u8 rsvd[4];
/* 16 bytes */
u8 feature; /* ATA Feature */
u8 hob_feature; /* ATA Ex. Feature */
u8 device; /* ATA Device/Head */
u8 mirctl; /* Mirror Control */
u8 nsect; /* ATA Sector Count */
u8 hob_nsect; /* ATA Ex. Sector Count */
u8 lbal; /* ATA Sector Number */
u8 hob_lbal; /* ATA Ex. Sector Number */
u8 lbam; /* ATA Cylinder Low */
u8 hob_lbam; /* ATA Ex. Cylinder Low */
u8 lbah; /* ATA Cylinder High */
u8 hob_lbah; /* ATA Ex. Cylinder High */
u8 command; /* ATA Command */
u8 ctl; /* ATA Control */
u8 slave_error; /* Slave ATA Error */
u8 slave_status; /* Slave ATA Status */
/* 32 bytes */
} __packed;
/* Physical Region Descriptor */
struct inic_prd {
__le32 mad; /* Physical Memory Address */
__le16 len; /* Transfer Length */
u8 rsvd;
u8 flags; /* Control Flags */
} __packed;
struct inic_pkt {
struct inic_cpb cpb;
struct inic_prd prd[LIBATA_MAX_PRD + 1]; /* + 1 for cdb */
u8 cdb[ATAPI_CDB_LEN];
} __packed;
struct inic_host_priv {
void __iomem *mmio_base;
u16 cached_hctl;
};
struct inic_port_priv {
struct inic_pkt *pkt;
dma_addr_t pkt_dma;
u32 *cpb_tbl;
dma_addr_t cpb_tbl_dma;
};
static struct scsi_host_template inic_sht = {
ATA_BASE_SHT(DRV_NAME),
.sg_tablesize = LIBATA_MAX_PRD, /* maybe it can be larger? */
.dma_boundary = INIC_DMA_BOUNDARY,
};
static const int scr_map[] = {
[SCR_STATUS] = 0,
[SCR_ERROR] = 1,
[SCR_CONTROL] = 2,
};
static void __iomem *inic_port_base(struct ata_port *ap)
{
struct inic_host_priv *hpriv = ap->host->private_data;
return hpriv->mmio_base + ap->port_no * PORT_SIZE;
}
static void inic_reset_port(void __iomem *port_base)
{
void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;
/* stop IDMA engine */
readw(idma_ctl); /* flush */
msleep(1);
/* mask IRQ and assert reset */
writew(IDMA_CTL_RST_IDMA, idma_ctl);
readw(idma_ctl); /* flush */
msleep(1);
/* release reset */
writew(0, idma_ctl);
/* clear irq */
writeb(0xff, port_base + PORT_IRQ_STAT);
}
static int inic_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val)
{
void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;
void __iomem *addr;
if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
return -EINVAL;
addr = scr_addr + scr_map[sc_reg] * 4;
*val = readl(scr_addr + scr_map[sc_reg] * 4);
/* this controller has stuck DIAG.N, ignore it */
if (sc_reg == SCR_ERROR)
*val &= ~SERR_PHYRDY_CHG;
return 0;
}
static int inic_scr_write(struct ata_link *link, unsigned sc_reg, u32 val)
{
void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;
if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
return -EINVAL;
writel(val, scr_addr + scr_map[sc_reg] * 4);
return 0;
}
static void inic_stop_idma(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
readb(port_base + PORT_RPQ_FIFO);
readb(port_base + PORT_RPQ_CNT);
writew(0, port_base + PORT_IDMA_CTL);
}
static void inic_host_err_intr(struct ata_port *ap, u8 irq_stat, u16 idma_stat)
{
struct ata_eh_info *ehi = &ap->link.eh_info;
struct inic_port_priv *pp = ap->private_data;
struct inic_cpb *cpb = &pp->pkt->cpb;
bool freeze = false;
ata_ehi_clear_desc(ehi);
ata_ehi_push_desc(ehi, "irq_stat=0x%x idma_stat=0x%x",
irq_stat, idma_stat);
inic_stop_idma(ap);
if (irq_stat & (PIRQ_OFFLINE | PIRQ_ONLINE)) {
ata_ehi_push_desc(ehi, "hotplug");
ata_ehi_hotplugged(ehi);
freeze = true;
}
if (idma_stat & IDMA_STAT_PERR) {
ata_ehi_push_desc(ehi, "PCI error");
freeze = true;
}
if (idma_stat & IDMA_STAT_CPBERR) {
ata_ehi_push_desc(ehi, "CPB error");
if (cpb->resp_flags & CPB_RESP_IGNORED) {
__ata_ehi_push_desc(ehi, " ignored");
ehi->err_mask |= AC_ERR_INVALID;
freeze = true;
}
if (cpb->resp_flags & CPB_RESP_ATA_ERR)
ehi->err_mask |= AC_ERR_DEV;
if (cpb->resp_flags & CPB_RESP_SPURIOUS) {
__ata_ehi_push_desc(ehi, " spurious-intr");
ehi->err_mask |= AC_ERR_HSM;
freeze = true;
}
if (cpb->resp_flags &
(CPB_RESP_UNDERFLOW | CPB_RESP_OVERFLOW)) {
__ata_ehi_push_desc(ehi, " data-over/underflow");
ehi->err_mask |= AC_ERR_HSM;
freeze = true;
}
}
if (freeze)
ata_port_freeze(ap);
else
ata_port_abort(ap);
}
static void inic_host_intr(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->link.active_tag);
u8 irq_stat;
u16 idma_stat;
/* read and clear IRQ status */
irq_stat = readb(port_base + PORT_IRQ_STAT);
writeb(irq_stat, port_base + PORT_IRQ_STAT);
idma_stat = readw(port_base + PORT_IDMA_STAT);
if (unlikely((irq_stat & PIRQ_ERR) || (idma_stat & IDMA_STAT_ERR)))
inic_host_err_intr(ap, irq_stat, idma_stat);
if (unlikely(!qc))
goto spurious;
if (likely(idma_stat & IDMA_STAT_DONE)) {
inic_stop_idma(ap);
/* Depending on circumstances, device error
* isn't reported by IDMA, check it explicitly.
*/
if (unlikely(readb(port_base + PORT_TF_COMMAND) &
(ATA_DF | ATA_ERR)))
qc->err_mask |= AC_ERR_DEV;
ata_qc_complete(qc);
return;
}
spurious:
ata_port_printk(ap, KERN_WARNING, "unhandled interrupt: "
"cmd=0x%x irq_stat=0x%x idma_stat=0x%x\n",
qc ? qc->tf.command : 0xff, irq_stat, idma_stat);
}
static irqreturn_t inic_interrupt(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct inic_host_priv *hpriv = host->private_data;
u16 host_irq_stat;
int i, handled = 0;
host_irq_stat = readw(hpriv->mmio_base + HOST_IRQ_STAT);
if (unlikely(!(host_irq_stat & HIRQ_GLOBAL)))
goto out;
spin_lock(&host->lock);
for (i = 0; i < NR_PORTS; i++)
if (host_irq_stat & (HIRQ_PORT0 << i)) {
inic_host_intr(host->ports[i]);
handled++;
}
spin_unlock(&host->lock);
out:
return IRQ_RETVAL(handled);
}
static int inic_check_atapi_dma(struct ata_queued_cmd *qc)
{
/* For some reason ATAPI_PROT_DMA doesn't work for some
* commands including writes and other misc ops. Use PIO
* protocol instead, which BTW is driven by the DMA engine
* anyway, so it shouldn't make much difference for native
* SATA devices.
*/
if (atapi_cmd_type(qc->cdb[0]) == READ)
return 0;
return 1;
}
static void inic_fill_sg(struct inic_prd *prd, struct ata_queued_cmd *qc)
{
struct scatterlist *sg;
unsigned int si;
u8 flags = 0;
if (qc->tf.flags & ATA_TFLAG_WRITE)
flags |= PRD_WRITE;
if (ata_is_dma(qc->tf.protocol))
flags |= PRD_DMA;
for_each_sg(qc->sg, sg, qc->n_elem, si) {
prd->mad = cpu_to_le32(sg_dma_address(sg));
prd->len = cpu_to_le16(sg_dma_len(sg));
prd->flags = flags;
prd++;
}
WARN_ON(!si);
prd[-1].flags |= PRD_END;
}
static void inic_qc_prep(struct ata_queued_cmd *qc)
{
struct inic_port_priv *pp = qc->ap->private_data;
struct inic_pkt *pkt = pp->pkt;
struct inic_cpb *cpb = &pkt->cpb;
struct inic_prd *prd = pkt->prd;
bool is_atapi = ata_is_atapi(qc->tf.protocol);
bool is_data = ata_is_data(qc->tf.protocol);
unsigned int cdb_len = 0;
VPRINTK("ENTER\n");
if (is_atapi)
cdb_len = qc->dev->cdb_len;
/* prepare packet, based on initio driver */
memset(pkt, 0, sizeof(struct inic_pkt));
cpb->ctl_flags = CPB_CTL_VALID | CPB_CTL_IEN;
if (is_atapi || is_data)
cpb->ctl_flags |= CPB_CTL_DATA;
cpb->len = cpu_to_le32(qc->nbytes + cdb_len);
cpb->prd = cpu_to_le32(pp->pkt_dma + offsetof(struct inic_pkt, prd));
cpb->device = qc->tf.device;
cpb->feature = qc->tf.feature;
cpb->nsect = qc->tf.nsect;
cpb->lbal = qc->tf.lbal;
cpb->lbam = qc->tf.lbam;
cpb->lbah = qc->tf.lbah;
if (qc->tf.flags & ATA_TFLAG_LBA48) {
cpb->hob_feature = qc->tf.hob_feature;
cpb->hob_nsect = qc->tf.hob_nsect;
cpb->hob_lbal = qc->tf.hob_lbal;
cpb->hob_lbam = qc->tf.hob_lbam;
cpb->hob_lbah = qc->tf.hob_lbah;
}
cpb->command = qc->tf.command;
/* don't load ctl - dunno why. it's like that in the initio driver */
/* setup PRD for CDB */
if (is_atapi) {
memcpy(pkt->cdb, qc->cdb, ATAPI_CDB_LEN);
prd->mad = cpu_to_le32(pp->pkt_dma +
offsetof(struct inic_pkt, cdb));
prd->len = cpu_to_le16(cdb_len);
prd->flags = PRD_CDB | PRD_WRITE;
if (!is_data)
prd->flags |= PRD_END;
prd++;
}
/* setup sg table */
if (is_data)
inic_fill_sg(prd, qc);
pp->cpb_tbl[0] = pp->pkt_dma;
}
static unsigned int inic_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *port_base = inic_port_base(ap);
/* fire up the ADMA engine */
writew(HCTL_FTHD0 | HCTL_LEDEN, port_base + HOST_CTL);
writew(IDMA_CTL_GO, port_base + PORT_IDMA_CTL);
writeb(0, port_base + PORT_CPB_PTQFIFO);
return 0;
}
static void inic_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
void __iomem *port_base = inic_port_base(ap);
tf->feature = readb(port_base + PORT_TF_FEATURE);
tf->nsect = readb(port_base + PORT_TF_NSECT);
tf->lbal = readb(port_base + PORT_TF_LBAL);
tf->lbam = readb(port_base + PORT_TF_LBAM);
tf->lbah = readb(port_base + PORT_TF_LBAH);
tf->device = readb(port_base + PORT_TF_DEVICE);
tf->command = readb(port_base + PORT_TF_COMMAND);
}
static bool inic_qc_fill_rtf(struct ata_queued_cmd *qc)
{
struct ata_taskfile *rtf = &qc->result_tf;
struct ata_taskfile tf;
/* FIXME: Except for status and error, result TF access
* doesn't work. I tried reading from BAR0/2, CPB and BAR5.
* None works regardless of which command interface is used.
* For now return true iff status indicates device error.
* This means that we're reporting bogus sector for RW
* failures. Eeekk....
*/
inic_tf_read(qc->ap, &tf);
if (!(tf.command & ATA_ERR))
return false;
rtf->command = tf.command;
rtf->feature = tf.feature;
return true;
}
static void inic_freeze(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
writeb(PIRQ_MASK_FREEZE, port_base + PORT_IRQ_MASK);
writeb(0xff, port_base + PORT_IRQ_STAT);
}
static void inic_thaw(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
writeb(0xff, port_base + PORT_IRQ_STAT);
writeb(PIRQ_MASK_DEFAULT, port_base + PORT_IRQ_MASK);
}
static int inic_check_ready(struct ata_link *link)
{
void __iomem *port_base = inic_port_base(link->ap);
return ata_check_ready(readb(port_base + PORT_TF_COMMAND));
}
/*
* SRST and SControl hardreset don't give valid signature on this
* controller. Only controller specific hardreset mechanism works.
*/
static int inic_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
void __iomem *port_base = inic_port_base(ap);
void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
int rc;
/* hammer it into sane state */
inic_reset_port(port_base);
writew(IDMA_CTL_RST_ATA, idma_ctl);
readw(idma_ctl); /* flush */
msleep(1);
writew(0, idma_ctl);
rc = sata_link_resume(link, timing, deadline);
if (rc) {
ata_link_printk(link, KERN_WARNING, "failed to resume "
"link after reset (errno=%d)\n", rc);
return rc;
}
*class = ATA_DEV_NONE;
if (ata_link_online(link)) {
struct ata_taskfile tf;
/* wait for link to become ready */
rc = ata_wait_after_reset(link, deadline, inic_check_ready);
/* link occupied, -ENODEV too is an error */
if (rc) {
ata_link_printk(link, KERN_WARNING, "device not ready "
"after hardreset (errno=%d)\n", rc);
return rc;
}
inic_tf_read(ap, &tf);
*class = ata_dev_classify(&tf);
}
return 0;
}
static void inic_error_handler(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
inic_reset_port(port_base);
ata_std_error_handler(ap);
}
static void inic_post_internal_cmd(struct ata_queued_cmd *qc)
{
/* make DMA engine forget about the failed command */
if (qc->flags & ATA_QCFLAG_FAILED)
inic_reset_port(inic_port_base(qc->ap));
}
static void init_port(struct ata_port *ap)
{
void __iomem *port_base = inic_port_base(ap);
struct inic_port_priv *pp = ap->private_data;
/* clear packet and CPB table */
memset(pp->pkt, 0, sizeof(struct inic_pkt));
memset(pp->cpb_tbl, 0, IDMA_CPB_TBL_SIZE);
/* setup CPB lookup table addresses */
writel(pp->cpb_tbl_dma, port_base + PORT_CPB_CPBLAR);
}
static int inic_port_resume(struct ata_port *ap)
{
init_port(ap);
return 0;
}
static int inic_port_start(struct ata_port *ap)
{
struct device *dev = ap->host->dev;
struct inic_port_priv *pp;
/* alloc and initialize private data */
pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
if (!pp)
return -ENOMEM;
ap->private_data = pp;
/* Alloc resources */
pp->pkt = dmam_alloc_coherent(dev, sizeof(struct inic_pkt),
&pp->pkt_dma, GFP_KERNEL);
if (!pp->pkt)
return -ENOMEM;
pp->cpb_tbl = dmam_alloc_coherent(dev, IDMA_CPB_TBL_SIZE,
&pp->cpb_tbl_dma, GFP_KERNEL);
if (!pp->cpb_tbl)
return -ENOMEM;
init_port(ap);
return 0;
}
static struct ata_port_operations inic_port_ops = {
.inherits = &sata_port_ops,
.check_atapi_dma = inic_check_atapi_dma,
.qc_prep = inic_qc_prep,
.qc_issue = inic_qc_issue,
.qc_fill_rtf = inic_qc_fill_rtf,
.freeze = inic_freeze,
.thaw = inic_thaw,
.hardreset = inic_hardreset,
.error_handler = inic_error_handler,
.post_internal_cmd = inic_post_internal_cmd,
.scr_read = inic_scr_read,
.scr_write = inic_scr_write,
.port_resume = inic_port_resume,
.port_start = inic_port_start,
};
static struct ata_port_info inic_port_info = {
.flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &inic_port_ops
};
static int init_controller(void __iomem *mmio_base, u16 hctl)
{
int i;
u16 val;
hctl &= ~HCTL_KNOWN_BITS;
/* Soft reset whole controller. Spec says reset duration is 3
* PCI clocks, be generous and give it 10ms.
*/
writew(hctl | HCTL_SOFTRST, mmio_base + HOST_CTL);
readw(mmio_base + HOST_CTL); /* flush */
for (i = 0; i < 10; i++) {
msleep(1);
val = readw(mmio_base + HOST_CTL);
if (!(val & HCTL_SOFTRST))
break;
}
if (val & HCTL_SOFTRST)
return -EIO;
/* mask all interrupts and reset ports */
for (i = 0; i < NR_PORTS; i++) {
void __iomem *port_base = mmio_base + i * PORT_SIZE;
writeb(0xff, port_base + PORT_IRQ_MASK);
inic_reset_port(port_base);
}
/* port IRQ is masked now, unmask global IRQ */
writew(hctl & ~HCTL_IRQOFF, mmio_base + HOST_CTL);
val = readw(mmio_base + HOST_IRQ_MASK);
val &= ~(HIRQ_PORT0 | HIRQ_PORT1);
writew(val, mmio_base + HOST_IRQ_MASK);
return 0;
}
#ifdef CONFIG_PM
static int inic_pci_device_resume(struct pci_dev *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
struct inic_host_priv *hpriv = host->private_data;
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
rc = init_controller(hpriv->mmio_base, hpriv->cached_hctl);
if (rc)
return rc;
}
ata_host_resume(host);
return 0;
}
#endif
static int inic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
const struct ata_port_info *ppi[] = { &inic_port_info, NULL };
struct ata_host *host;
struct inic_host_priv *hpriv;
void __iomem * const *iomap;
int mmio_bar;
int i, rc;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
/* alloc host */
host = ata_host_alloc_pinfo(&pdev->dev, ppi, NR_PORTS);
hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
if (!host || !hpriv)
return -ENOMEM;
host->private_data = hpriv;
/* Acquire resources and fill host. Note that PCI and cardbus
* use different BARs.
*/
rc = pcim_enable_device(pdev);
if (rc)
return rc;
if (pci_resource_flags(pdev, MMIO_BAR_PCI) & IORESOURCE_MEM)
mmio_bar = MMIO_BAR_PCI;
else
mmio_bar = MMIO_BAR_CARDBUS;
rc = pcim_iomap_regions(pdev, 1 << mmio_bar, DRV_NAME);
if (rc)
return rc;
host->iomap = iomap = pcim_iomap_table(pdev);
hpriv->mmio_base = iomap[mmio_bar];
hpriv->cached_hctl = readw(hpriv->mmio_base + HOST_CTL);
for (i = 0; i < NR_PORTS; i++) {
struct ata_port *ap = host->ports[i];
ata_port_pbar_desc(ap, mmio_bar, -1, "mmio");
ata_port_pbar_desc(ap, mmio_bar, i * PORT_SIZE, "port");
}
/* Set dma_mask. This devices doesn't support 64bit addressing. */
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit DMA enable failed\n");
return rc;
}
rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit consistent DMA enable failed\n");
return rc;
}
/*
* This controller is braindamaged. dma_boundary is 0xffff
* like others but it will lock up the whole machine HARD if
* 65536 byte PRD entry is fed. Reduce maximum segment size.
*/
rc = pci_set_dma_max_seg_size(pdev, 65536 - 512);
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"failed to set the maximum segment size.\n");
return rc;
}
rc = init_controller(hpriv->mmio_base, hpriv->cached_hctl);
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"failed to initialize controller\n");
return rc;
}
pci_set_master(pdev);
return ata_host_activate(host, pdev->irq, inic_interrupt, IRQF_SHARED,
&inic_sht);
}
static const struct pci_device_id inic_pci_tbl[] = {
{ PCI_VDEVICE(INIT, 0x1622), },
{ },
};
static struct pci_driver inic_pci_driver = {
.name = DRV_NAME,
.id_table = inic_pci_tbl,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = inic_pci_device_resume,
#endif
.probe = inic_init_one,
.remove = ata_pci_remove_one,
};
static int __init inic_init(void)
{
return pci_register_driver(&inic_pci_driver);
}
static void __exit inic_exit(void)
{
pci_unregister_driver(&inic_pci_driver);
}
MODULE_AUTHOR("Tejun Heo");
MODULE_DESCRIPTION("low-level driver for Initio 162x SATA");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(pci, inic_pci_tbl);
MODULE_VERSION(DRV_VERSION);
module_init(inic_init);
module_exit(inic_exit);
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