linux-sg2042/drivers/ata/pdc_adma.c

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/*
* pdc_adma.c - Pacific Digital Corporation ADMA
*
* Maintained by: Mark Lord <mlord@pobox.com>
*
* Copyright 2005 Mark Lord
*
* 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.*
*
*
* Supports ATA disks in single-packet ADMA mode.
* Uses PIO for everything else.
*
* TODO: Use ADMA transfers for ATAPI devices, when possible.
* This requires careful attention to a number of quirks of the chip.
*
*/
#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 <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pdc_adma"
#define DRV_VERSION "1.0"
/* macro to calculate base address for ATA regs */
#define ADMA_ATA_REGS(base, port_no) ((base) + ((port_no) * 0x40))
/* macro to calculate base address for ADMA regs */
#define ADMA_REGS(base, port_no) ((base) + 0x80 + ((port_no) * 0x20))
/* macro to obtain addresses from ata_port */
#define ADMA_PORT_REGS(ap) \
ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no)
enum {
ADMA_MMIO_BAR = 4,
ADMA_PORTS = 2,
ADMA_CPB_BYTES = 40,
ADMA_PRD_BYTES = LIBATA_MAX_PRD * 16,
ADMA_PKT_BYTES = ADMA_CPB_BYTES + ADMA_PRD_BYTES,
ADMA_DMA_BOUNDARY = 0xffffffff,
/* global register offsets */
ADMA_MODE_LOCK = 0x00c7,
/* per-channel register offsets */
ADMA_CONTROL = 0x0000, /* ADMA control */
ADMA_STATUS = 0x0002, /* ADMA status */
ADMA_CPB_COUNT = 0x0004, /* CPB count */
ADMA_CPB_CURRENT = 0x000c, /* current CPB address */
ADMA_CPB_NEXT = 0x000c, /* next CPB address */
ADMA_CPB_LOOKUP = 0x0010, /* CPB lookup table */
ADMA_FIFO_IN = 0x0014, /* input FIFO threshold */
ADMA_FIFO_OUT = 0x0016, /* output FIFO threshold */
/* ADMA_CONTROL register bits */
aNIEN = (1 << 8), /* irq mask: 1==masked */
aGO = (1 << 7), /* packet trigger ("Go!") */
aRSTADM = (1 << 5), /* ADMA logic reset */
aPIOMD4 = 0x0003, /* PIO mode 4 */
/* ADMA_STATUS register bits */
aPSD = (1 << 6),
aUIRQ = (1 << 4),
aPERR = (1 << 0),
/* CPB bits */
cDONE = (1 << 0),
cATERR = (1 << 3),
cVLD = (1 << 0),
cDAT = (1 << 2),
cIEN = (1 << 3),
/* PRD bits */
pORD = (1 << 4),
pDIRO = (1 << 5),
pEND = (1 << 7),
/* ATA register flags */
rIGN = (1 << 5),
rEND = (1 << 7),
/* ATA register addresses */
ADMA_REGS_CONTROL = 0x0e,
ADMA_REGS_SECTOR_COUNT = 0x12,
ADMA_REGS_LBA_LOW = 0x13,
ADMA_REGS_LBA_MID = 0x14,
ADMA_REGS_LBA_HIGH = 0x15,
ADMA_REGS_DEVICE = 0x16,
ADMA_REGS_COMMAND = 0x17,
/* PCI device IDs */
board_1841_idx = 0, /* ADMA 2-port controller */
};
typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
struct adma_port_priv {
u8 *pkt;
dma_addr_t pkt_dma;
adma_state_t state;
};
static int adma_ata_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent);
static int adma_port_start(struct ata_port *ap);
static void adma_port_stop(struct ata_port *ap);
static void adma_qc_prep(struct ata_queued_cmd *qc);
static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void adma_freeze(struct ata_port *ap);
static void adma_thaw(struct ata_port *ap);
libata: make reset related methods proper port operations Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:50 +08:00
static int adma_prereset(struct ata_link *link, unsigned long deadline);
static struct scsi_host_template adma_ata_sht = {
ATA_BASE_SHT(DRV_NAME),
.sg_tablesize = LIBATA_MAX_PRD,
.dma_boundary = ADMA_DMA_BOUNDARY,
};
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:49 +08:00
static struct ata_port_operations adma_ata_ops = {
.inherits = &ata_sff_port_ops,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:49 +08:00
.check_atapi_dma = adma_check_atapi_dma,
.qc_prep = adma_qc_prep,
.qc_issue = adma_qc_issue,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:49 +08:00
.freeze = adma_freeze,
.thaw = adma_thaw,
libata: make reset related methods proper port operations Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:50 +08:00
.prereset = adma_prereset,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 11:22:49 +08:00
.port_start = adma_port_start,
.port_stop = adma_port_stop,
};
static struct ata_port_info adma_port_info[] = {
/* board_1841_idx */
{
.flags = ATA_FLAG_SLAVE_POSS |
ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING,
.pio_mask = 0x10, /* pio4 */
.udma_mask = ATA_UDMA4,
.port_ops = &adma_ata_ops,
},
};
static const struct pci_device_id adma_ata_pci_tbl[] = {
{ PCI_VDEVICE(PDC, 0x1841), board_1841_idx },
{ } /* terminate list */
};
static struct pci_driver adma_ata_pci_driver = {
.name = DRV_NAME,
.id_table = adma_ata_pci_tbl,
.probe = adma_ata_init_one,
.remove = ata_pci_remove_one,
};
static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
{
return 1; /* ATAPI DMA not yet supported */
}
static void adma_reset_engine(struct ata_port *ap)
{
void __iomem *chan = ADMA_PORT_REGS(ap);
/* reset ADMA to idle state */
writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
udelay(2);
writew(aPIOMD4, chan + ADMA_CONTROL);
udelay(2);
}
static void adma_reinit_engine(struct ata_port *ap)
{
struct adma_port_priv *pp = ap->private_data;
void __iomem *chan = ADMA_PORT_REGS(ap);
/* mask/clear ATA interrupts */
writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
ata_sff_check_status(ap);
/* reset the ADMA engine */
adma_reset_engine(ap);
/* set in-FIFO threshold to 0x100 */
writew(0x100, chan + ADMA_FIFO_IN);
/* set CPB pointer */
writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
/* set out-FIFO threshold to 0x100 */
writew(0x100, chan + ADMA_FIFO_OUT);
/* set CPB count */
writew(1, chan + ADMA_CPB_COUNT);
/* read/discard ADMA status */
readb(chan + ADMA_STATUS);
}
static inline void adma_enter_reg_mode(struct ata_port *ap)
{
void __iomem *chan = ADMA_PORT_REGS(ap);
writew(aPIOMD4, chan + ADMA_CONTROL);
readb(chan + ADMA_STATUS); /* flush */
}
static void adma_freeze(struct ata_port *ap)
{
void __iomem *chan = ADMA_PORT_REGS(ap);
/* mask/clear ATA interrupts */
writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
ata_sff_check_status(ap);
/* reset ADMA to idle state */
writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
udelay(2);
writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
udelay(2);
}
static void adma_thaw(struct ata_port *ap)
{
adma_reinit_engine(ap);
}
static int adma_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct adma_port_priv *pp = ap->private_data;
if (pp->state != adma_state_idle) /* healthy paranoia */
pp->state = adma_state_mmio;
adma_reinit_engine(ap);
return ata_sff_prereset(link, deadline);
}
static int adma_fill_sg(struct ata_queued_cmd *qc)
{
struct scatterlist *sg;
struct ata_port *ap = qc->ap;
struct adma_port_priv *pp = ap->private_data;
u8 *buf = pp->pkt, *last_buf = NULL;
int i = (2 + buf[3]) * 8;
u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
unsigned int si;
for_each_sg(qc->sg, sg, qc->n_elem, si) {
u32 addr;
u32 len;
addr = (u32)sg_dma_address(sg);
*(__le32 *)(buf + i) = cpu_to_le32(addr);
i += 4;
len = sg_dma_len(sg) >> 3;
*(__le32 *)(buf + i) = cpu_to_le32(len);
i += 4;
last_buf = &buf[i];
buf[i++] = pFLAGS;
buf[i++] = qc->dev->dma_mode & 0xf;
buf[i++] = 0; /* pPKLW */
buf[i++] = 0; /* reserved */
*(__le32 *)(buf + i) =
(pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
i += 4;
VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", i/4,
(unsigned long)addr, len);
}
if (likely(last_buf))
*last_buf |= pEND;
return i;
}
static void adma_qc_prep(struct ata_queued_cmd *qc)
{
struct adma_port_priv *pp = qc->ap->private_data;
u8 *buf = pp->pkt;
u32 pkt_dma = (u32)pp->pkt_dma;
int i = 0;
VPRINTK("ENTER\n");
adma_enter_reg_mode(qc->ap);
if (qc->tf.protocol != ATA_PROT_DMA) {
ata_sff_qc_prep(qc);
return;
}
buf[i++] = 0; /* Response flags */
buf[i++] = 0; /* reserved */
buf[i++] = cVLD | cDAT | cIEN;
i++; /* cLEN, gets filled in below */
*(__le32 *)(buf+i) = cpu_to_le32(pkt_dma); /* cNCPB */
i += 4; /* cNCPB */
i += 4; /* cPRD, gets filled in below */
buf[i++] = 0; /* reserved */
buf[i++] = 0; /* reserved */
buf[i++] = 0; /* reserved */
buf[i++] = 0; /* reserved */
/* ATA registers; must be a multiple of 4 */
buf[i++] = qc->tf.device;
buf[i++] = ADMA_REGS_DEVICE;
if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
buf[i++] = qc->tf.hob_nsect;
buf[i++] = ADMA_REGS_SECTOR_COUNT;
buf[i++] = qc->tf.hob_lbal;
buf[i++] = ADMA_REGS_LBA_LOW;
buf[i++] = qc->tf.hob_lbam;
buf[i++] = ADMA_REGS_LBA_MID;
buf[i++] = qc->tf.hob_lbah;
buf[i++] = ADMA_REGS_LBA_HIGH;
}
buf[i++] = qc->tf.nsect;
buf[i++] = ADMA_REGS_SECTOR_COUNT;
buf[i++] = qc->tf.lbal;
buf[i++] = ADMA_REGS_LBA_LOW;
buf[i++] = qc->tf.lbam;
buf[i++] = ADMA_REGS_LBA_MID;
buf[i++] = qc->tf.lbah;
buf[i++] = ADMA_REGS_LBA_HIGH;
buf[i++] = 0;
buf[i++] = ADMA_REGS_CONTROL;
buf[i++] = rIGN;
buf[i++] = 0;
buf[i++] = qc->tf.command;
buf[i++] = ADMA_REGS_COMMAND | rEND;
buf[3] = (i >> 3) - 2; /* cLEN */
*(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i); /* cPRD */
i = adma_fill_sg(qc);
wmb(); /* flush PRDs and pkt to memory */
#if 0
/* dump out CPB + PRDs for debug */
{
int j, len = 0;
static char obuf[2048];
for (j = 0; j < i; ++j) {
len += sprintf(obuf+len, "%02x ", buf[j]);
if ((j & 7) == 7) {
printk("%s\n", obuf);
len = 0;
}
}
if (len)
printk("%s\n", obuf);
}
#endif
}
static inline void adma_packet_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *chan = ADMA_PORT_REGS(ap);
VPRINTK("ENTER, ap %p\n", ap);
/* fire up the ADMA engine */
writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
}
static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
{
struct adma_port_priv *pp = qc->ap->private_data;
switch (qc->tf.protocol) {
case ATA_PROT_DMA:
pp->state = adma_state_pkt;
adma_packet_start(qc);
return 0;
case ATAPI_PROT_DMA:
BUG();
break;
default:
break;
}
pp->state = adma_state_mmio;
return ata_sff_qc_issue(qc);
}
static inline unsigned int adma_intr_pkt(struct ata_host *host)
{
unsigned int handled = 0, port_no;
for (port_no = 0; port_no < host->n_ports; ++port_no) {
struct ata_port *ap = host->ports[port_no];
struct adma_port_priv *pp;
struct ata_queued_cmd *qc;
void __iomem *chan = ADMA_PORT_REGS(ap);
u8 status = readb(chan + ADMA_STATUS);
if (status == 0)
continue;
handled = 1;
adma_enter_reg_mode(ap);
if (ap->flags & ATA_FLAG_DISABLED)
continue;
pp = ap->private_data;
if (!pp || pp->state != adma_state_pkt)
continue;
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
if (status & aPERR)
qc->err_mask |= AC_ERR_HOST_BUS;
else if ((status & (aPSD | aUIRQ)))
qc->err_mask |= AC_ERR_OTHER;
if (pp->pkt[0] & cATERR)
qc->err_mask |= AC_ERR_DEV;
else if (pp->pkt[0] != cDONE)
qc->err_mask |= AC_ERR_OTHER;
if (!qc->err_mask)
ata_qc_complete(qc);
else {
struct ata_eh_info *ehi = &ap->link.eh_info;
ata_ehi_clear_desc(ehi);
ata_ehi_push_desc(ehi,
"ADMA-status 0x%02X", status);
ata_ehi_push_desc(ehi,
"pkt[0] 0x%02X", pp->pkt[0]);
if (qc->err_mask == AC_ERR_DEV)
ata_port_abort(ap);
else
ata_port_freeze(ap);
}
}
}
return handled;
}
static inline unsigned int adma_intr_mmio(struct ata_host *host)
{
unsigned int handled = 0, port_no;
for (port_no = 0; port_no < host->n_ports; ++port_no) {
struct ata_port *ap;
ap = host->ports[port_no];
if (ap && (!(ap->flags & ATA_FLAG_DISABLED))) {
struct ata_queued_cmd *qc;
struct adma_port_priv *pp = ap->private_data;
if (!pp || pp->state != adma_state_mmio)
continue;
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
/* check main status, clearing INTRQ */
u8 status = ata_sff_check_status(ap);
if ((status & ATA_BUSY))
continue;
DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
ap->print_id, qc->tf.protocol, status);
2006-08-31 12:02:15 +08:00
/* complete taskfile transaction */
pp->state = adma_state_idle;
qc->err_mask |= ac_err_mask(status);
if (!qc->err_mask)
ata_qc_complete(qc);
else {
struct ata_eh_info *ehi =
&ap->link.eh_info;
ata_ehi_clear_desc(ehi);
ata_ehi_push_desc(ehi,
"status 0x%02X", status);
if (qc->err_mask == AC_ERR_DEV)
ata_port_abort(ap);
else
ata_port_freeze(ap);
}
handled = 1;
}
}
}
return handled;
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
static irqreturn_t adma_intr(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
unsigned int handled = 0;
VPRINTK("ENTER\n");
spin_lock(&host->lock);
handled = adma_intr_pkt(host) | adma_intr_mmio(host);
spin_unlock(&host->lock);
VPRINTK("EXIT\n");
return IRQ_RETVAL(handled);
}
static void adma_ata_setup_port(struct ata_ioports *port, void __iomem *base)
{
port->cmd_addr =
port->data_addr = base + 0x000;
port->error_addr =
port->feature_addr = base + 0x004;
port->nsect_addr = base + 0x008;
port->lbal_addr = base + 0x00c;
port->lbam_addr = base + 0x010;
port->lbah_addr = base + 0x014;
port->device_addr = base + 0x018;
port->status_addr =
port->command_addr = base + 0x01c;
port->altstatus_addr =
port->ctl_addr = base + 0x038;
}
static int adma_port_start(struct ata_port *ap)
{
struct device *dev = ap->host->dev;
struct adma_port_priv *pp;
int rc;
rc = ata_port_start(ap);
if (rc)
return rc;
adma_enter_reg_mode(ap);
pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
if (!pp)
return -ENOMEM;
pp->pkt = dmam_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
GFP_KERNEL);
if (!pp->pkt)
return -ENOMEM;
/* paranoia? */
if ((pp->pkt_dma & 7) != 0) {
printk(KERN_ERR "bad alignment for pp->pkt_dma: %08x\n",
(u32)pp->pkt_dma);
return -ENOMEM;
}
memset(pp->pkt, 0, ADMA_PKT_BYTES);
ap->private_data = pp;
adma_reinit_engine(ap);
return 0;
}
static void adma_port_stop(struct ata_port *ap)
{
adma_reset_engine(ap);
}
static void adma_host_init(struct ata_host *host, unsigned int chip_id)
{
unsigned int port_no;
/* enable/lock aGO operation */
writeb(7, host->iomap[ADMA_MMIO_BAR] + ADMA_MODE_LOCK);
/* reset the ADMA logic */
for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
adma_reset_engine(host->ports[port_no]);
}
static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
{
int rc;
rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit DMA enable failed\n");
return rc;
}
rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit consistent DMA enable failed\n");
return rc;
}
return 0;
}
static int adma_ata_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
static int printed_version;
unsigned int board_idx = (unsigned int) ent->driver_data;
const struct ata_port_info *ppi[] = { &adma_port_info[board_idx], NULL };
struct ata_host *host;
void __iomem *mmio_base;
int rc, port_no;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
/* alloc host */
host = ata_host_alloc_pinfo(&pdev->dev, ppi, ADMA_PORTS);
if (!host)
return -ENOMEM;
/* acquire resources and fill host */
rc = pcim_enable_device(pdev);
if (rc)
return rc;
if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0)
return -ENODEV;
rc = pcim_iomap_regions(pdev, 1 << ADMA_MMIO_BAR, DRV_NAME);
if (rc)
return rc;
host->iomap = pcim_iomap_table(pdev);
mmio_base = host->iomap[ADMA_MMIO_BAR];
rc = adma_set_dma_masks(pdev, mmio_base);
if (rc)
return rc;
for (port_no = 0; port_no < ADMA_PORTS; ++port_no) {
struct ata_port *ap = host->ports[port_no];
void __iomem *port_base = ADMA_ATA_REGS(mmio_base, port_no);
unsigned int offset = port_base - mmio_base;
adma_ata_setup_port(&ap->ioaddr, port_base);
ata_port_pbar_desc(ap, ADMA_MMIO_BAR, -1, "mmio");
ata_port_pbar_desc(ap, ADMA_MMIO_BAR, offset, "port");
}
/* initialize adapter */
adma_host_init(host, board_idx);
pci_set_master(pdev);
return ata_host_activate(host, pdev->irq, adma_intr, IRQF_SHARED,
&adma_ata_sht);
}
static int __init adma_ata_init(void)
{
return pci_register_driver(&adma_ata_pci_driver);
}
static void __exit adma_ata_exit(void)
{
pci_unregister_driver(&adma_ata_pci_driver);
}
MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
MODULE_VERSION(DRV_VERSION);
module_init(adma_ata_init);
module_exit(adma_ata_exit);