blob: e2953fc1fafbc175bb87bac04e9acf94a28944e2 [file] [log] [blame]
/*
* linux/drivers/ide/arm/icside.c
*
* Copyright (c) 1996-2004 Russell King.
*
* Please note that this platform does not support 32-bit IDE IO.
*/
#include <linux/string.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/scatterlist.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#define ICS_IDENT_OFFSET 0x2280
#define ICS_ARCIN_V5_INTRSTAT 0x0000
#define ICS_ARCIN_V5_INTROFFSET 0x0004
#define ICS_ARCIN_V5_IDEOFFSET 0x2800
#define ICS_ARCIN_V5_IDEALTOFFSET 0x2b80
#define ICS_ARCIN_V5_IDESTEPPING 6
#define ICS_ARCIN_V6_IDEOFFSET_1 0x2000
#define ICS_ARCIN_V6_INTROFFSET_1 0x2200
#define ICS_ARCIN_V6_INTRSTAT_1 0x2290
#define ICS_ARCIN_V6_IDEALTOFFSET_1 0x2380
#define ICS_ARCIN_V6_IDEOFFSET_2 0x3000
#define ICS_ARCIN_V6_INTROFFSET_2 0x3200
#define ICS_ARCIN_V6_INTRSTAT_2 0x3290
#define ICS_ARCIN_V6_IDEALTOFFSET_2 0x3380
#define ICS_ARCIN_V6_IDESTEPPING 6
struct cardinfo {
unsigned int dataoffset;
unsigned int ctrloffset;
unsigned int stepping;
};
static struct cardinfo icside_cardinfo_v5 = {
.dataoffset = ICS_ARCIN_V5_IDEOFFSET,
.ctrloffset = ICS_ARCIN_V5_IDEALTOFFSET,
.stepping = ICS_ARCIN_V5_IDESTEPPING,
};
static struct cardinfo icside_cardinfo_v6_1 = {
.dataoffset = ICS_ARCIN_V6_IDEOFFSET_1,
.ctrloffset = ICS_ARCIN_V6_IDEALTOFFSET_1,
.stepping = ICS_ARCIN_V6_IDESTEPPING,
};
static struct cardinfo icside_cardinfo_v6_2 = {
.dataoffset = ICS_ARCIN_V6_IDEOFFSET_2,
.ctrloffset = ICS_ARCIN_V6_IDEALTOFFSET_2,
.stepping = ICS_ARCIN_V6_IDESTEPPING,
};
struct icside_state {
unsigned int channel;
unsigned int enabled;
void __iomem *irq_port;
void __iomem *ioc_base;
unsigned int type;
/* parent device... until the IDE core gets one of its own */
struct device *dev;
ide_hwif_t *hwif[2];
};
#define ICS_TYPE_A3IN 0
#define ICS_TYPE_A3USER 1
#define ICS_TYPE_V6 3
#define ICS_TYPE_V5 15
#define ICS_TYPE_NOTYPE ((unsigned int)-1)
/* ---------------- Version 5 PCB Support Functions --------------------- */
/* Prototype: icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
* Purpose : enable interrupts from card
*/
static void icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
{
struct icside_state *state = ec->irq_data;
writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
}
/* Prototype: icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
* Purpose : disable interrupts from card
*/
static void icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
{
struct icside_state *state = ec->irq_data;
readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
}
static const expansioncard_ops_t icside_ops_arcin_v5 = {
.irqenable = icside_irqenable_arcin_v5,
.irqdisable = icside_irqdisable_arcin_v5,
};
/* ---------------- Version 6 PCB Support Functions --------------------- */
/* Prototype: icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
* Purpose : enable interrupts from card
*/
static void icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
{
struct icside_state *state = ec->irq_data;
void __iomem *base = state->irq_port;
state->enabled = 1;
switch (state->channel) {
case 0:
writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
readb(base + ICS_ARCIN_V6_INTROFFSET_2);
break;
case 1:
writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
readb(base + ICS_ARCIN_V6_INTROFFSET_1);
break;
}
}
/* Prototype: icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
* Purpose : disable interrupts from card
*/
static void icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
{
struct icside_state *state = ec->irq_data;
state->enabled = 0;
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
}
/* Prototype: icside_irqprobe(struct expansion_card *ec)
* Purpose : detect an active interrupt from card
*/
static int icside_irqpending_arcin_v6(struct expansion_card *ec)
{
struct icside_state *state = ec->irq_data;
return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
}
static const expansioncard_ops_t icside_ops_arcin_v6 = {
.irqenable = icside_irqenable_arcin_v6,
.irqdisable = icside_irqdisable_arcin_v6,
.irqpending = icside_irqpending_arcin_v6,
};
/*
* Handle routing of interrupts. This is called before
* we write the command to the drive.
*/
static void icside_maskproc(ide_drive_t *drive, int mask)
{
ide_hwif_t *hwif = HWIF(drive);
struct icside_state *state = hwif->hwif_data;
unsigned long flags;
local_irq_save(flags);
state->channel = hwif->channel;
if (state->enabled && !mask) {
switch (hwif->channel) {
case 0:
writeb(0, state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
break;
case 1:
writeb(0, state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
break;
}
} else {
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
}
local_irq_restore(flags);
}
#ifdef CONFIG_BLK_DEV_IDEDMA_ICS
/*
* SG-DMA support.
*
* Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
* There is only one DMA controller per card, which means that only
* one drive can be accessed at one time. NOTE! We do not enforce that
* here, but we rely on the main IDE driver spotting that both
* interfaces use the same IRQ, which should guarantee this.
*/
static void icside_build_sglist(ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = drive->hwif;
struct icside_state *state = hwif->hwif_data;
struct scatterlist *sg = hwif->sg_table;
ide_map_sg(drive, rq);
if (rq_data_dir(rq) == READ)
hwif->sg_dma_direction = DMA_FROM_DEVICE;
else
hwif->sg_dma_direction = DMA_TO_DEVICE;
hwif->sg_nents = dma_map_sg(state->dev, sg, hwif->sg_nents,
hwif->sg_dma_direction);
}
/*
* Configure the IOMD to give the appropriate timings for the transfer
* mode being requested. We take the advice of the ATA standards, and
* calculate the cycle time based on the transfer mode, and the EIDE
* MW DMA specs that the drive provides in the IDENTIFY command.
*
* We have the following IOMD DMA modes to choose from:
*
* Type Active Recovery Cycle
* A 250 (250) 312 (550) 562 (800)
* B 187 250 437
* C 125 (125) 125 (375) 250 (500)
* D 62 125 187
*
* (figures in brackets are actual measured timings)
*
* However, we also need to take care of the read/write active and
* recovery timings:
*
* Read Write
* Mode Active -- Recovery -- Cycle IOMD type
* MW0 215 50 215 480 A
* MW1 80 50 50 150 C
* MW2 70 25 25 120 C
*/
static int icside_set_speed(ide_drive_t *drive, u8 xfer_mode)
{
int on = 0, cycle_time = 0, use_dma_info = 0;
/*
* Limit the transfer speed to MW_DMA_2.
*/
if (xfer_mode > XFER_MW_DMA_2)
xfer_mode = XFER_MW_DMA_2;
switch (xfer_mode) {
case XFER_MW_DMA_2:
cycle_time = 250;
use_dma_info = 1;
break;
case XFER_MW_DMA_1:
cycle_time = 250;
use_dma_info = 1;
break;
case XFER_MW_DMA_0:
cycle_time = 480;
break;
case XFER_SW_DMA_2:
case XFER_SW_DMA_1:
case XFER_SW_DMA_0:
cycle_time = 480;
break;
}
/*
* If we're going to be doing MW_DMA_1 or MW_DMA_2, we should
* take care to note the values in the ID...
*/
if (use_dma_info && drive->id->eide_dma_time > cycle_time)
cycle_time = drive->id->eide_dma_time;
drive->drive_data = cycle_time;
if (cycle_time && ide_config_drive_speed(drive, xfer_mode) == 0)
on = 1;
else
drive->drive_data = 480;
printk("%s: %s selected (peak %dMB/s)\n", drive->name,
ide_xfer_verbose(xfer_mode), 2000 / drive->drive_data);
drive->current_speed = xfer_mode;
return on;
}
static void icside_dma_host_off(ide_drive_t *drive)
{
}
static void icside_dma_off_quietly(ide_drive_t *drive)
{
drive->using_dma = 0;
}
static void icside_dma_host_on(ide_drive_t *drive)
{
}
static int icside_dma_on(ide_drive_t *drive)
{
drive->using_dma = 1;
return 0;
}
static int icside_dma_check(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
ide_hwif_t *hwif = HWIF(drive);
int xfer_mode = XFER_PIO_2;
int on;
if (!(id->capability & 1) || !hwif->autodma)
goto out;
/*
* Consult the list of known "bad" drives
*/
if (__ide_dma_bad_drive(drive))
goto out;
/*
* Enable DMA on any drive that has multiword DMA
*/
if (id->field_valid & 2) {
xfer_mode = ide_dma_speed(drive, 0);
goto out;
}
/*
* Consult the list of known "good" drives
*/
if (__ide_dma_good_drive(drive)) {
if (id->eide_dma_time > 150)
goto out;
xfer_mode = XFER_MW_DMA_1;
}
out:
on = icside_set_speed(drive, xfer_mode);
return on ? 0 : -1;
}
static int icside_dma_end(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct icside_state *state = hwif->hwif_data;
drive->waiting_for_dma = 0;
disable_dma(hwif->hw.dma);
/* Teardown mappings after DMA has completed. */
dma_unmap_sg(state->dev, hwif->sg_table, hwif->sg_nents,
hwif->sg_dma_direction);
return get_dma_residue(hwif->hw.dma) != 0;
}
static void icside_dma_start(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
/* We can not enable DMA on both channels simultaneously. */
BUG_ON(dma_channel_active(hwif->hw.dma));
enable_dma(hwif->hw.dma);
}
static int icside_dma_setup(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct request *rq = hwif->hwgroup->rq;
unsigned int dma_mode;
if (rq_data_dir(rq))
dma_mode = DMA_MODE_WRITE;
else
dma_mode = DMA_MODE_READ;
/*
* We can not enable DMA on both channels.
*/
BUG_ON(dma_channel_active(hwif->hw.dma));
icside_build_sglist(drive, rq);
/*
* Ensure that we have the right interrupt routed.
*/
icside_maskproc(drive, 0);
/*
* Route the DMA signals to the correct interface.
*/
writeb(hwif->select_data, hwif->config_data);
/*
* Select the correct timing for this drive.
*/
set_dma_speed(hwif->hw.dma, drive->drive_data);
/*
* Tell the DMA engine about the SG table and
* data direction.
*/
set_dma_sg(hwif->hw.dma, hwif->sg_table, hwif->sg_nents);
set_dma_mode(hwif->hw.dma, dma_mode);
drive->waiting_for_dma = 1;
return 0;
}
static void icside_dma_exec_cmd(ide_drive_t *drive, u8 cmd)
{
/* issue cmd to drive */
ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD, NULL);
}
static int icside_dma_test_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct icside_state *state = hwif->hwif_data;
return readb(state->irq_port +
(hwif->channel ?
ICS_ARCIN_V6_INTRSTAT_2 :
ICS_ARCIN_V6_INTRSTAT_1)) & 1;
}
static int icside_dma_timeout(ide_drive_t *drive)
{
printk(KERN_ERR "%s: DMA timeout occurred: ", drive->name);
if (icside_dma_test_irq(drive))
return 0;
ide_dump_status(drive, "DMA timeout",
HWIF(drive)->INB(IDE_STATUS_REG));
return icside_dma_end(drive);
}
static int icside_dma_lostirq(ide_drive_t *drive)
{
printk(KERN_ERR "%s: IRQ lost\n", drive->name);
return 1;
}
static void icside_dma_init(ide_hwif_t *hwif)
{
printk(" %s: SG-DMA", hwif->name);
hwif->atapi_dma = 1;
hwif->mwdma_mask = 7; /* MW0..2 */
hwif->swdma_mask = 7; /* SW0..2 */
hwif->dmatable_cpu = NULL;
hwif->dmatable_dma = 0;
hwif->speedproc = icside_set_speed;
hwif->autodma = 1;
hwif->ide_dma_check = icside_dma_check;
hwif->dma_host_off = icside_dma_host_off;
hwif->dma_off_quietly = icside_dma_off_quietly;
hwif->dma_host_on = icside_dma_host_on;
hwif->ide_dma_on = icside_dma_on;
hwif->dma_setup = icside_dma_setup;
hwif->dma_exec_cmd = icside_dma_exec_cmd;
hwif->dma_start = icside_dma_start;
hwif->ide_dma_end = icside_dma_end;
hwif->ide_dma_test_irq = icside_dma_test_irq;
hwif->ide_dma_timeout = icside_dma_timeout;
hwif->ide_dma_lostirq = icside_dma_lostirq;
hwif->drives[0].autodma = hwif->autodma;
hwif->drives[1].autodma = hwif->autodma;
printk(" capable%s\n", hwif->autodma ? ", auto-enable" : "");
}
#else
#define icside_dma_init(hwif) (0)
#endif
static ide_hwif_t *icside_find_hwif(unsigned long dataport)
{
ide_hwif_t *hwif;
int index;
for (index = 0; index < MAX_HWIFS; ++index) {
hwif = &ide_hwifs[index];
if (hwif->io_ports[IDE_DATA_OFFSET] == dataport)
goto found;
}
for (index = 0; index < MAX_HWIFS; ++index) {
hwif = &ide_hwifs[index];
if (!hwif->io_ports[IDE_DATA_OFFSET])
goto found;
}
hwif = NULL;
found:
return hwif;
}
static ide_hwif_t *
icside_setup(void __iomem *base, struct cardinfo *info, struct expansion_card *ec)
{
unsigned long port = (unsigned long)base + info->dataoffset;
ide_hwif_t *hwif;
hwif = icside_find_hwif(port);
if (hwif) {
int i;
memset(&hwif->hw, 0, sizeof(hw_regs_t));
/*
* Ensure we're using MMIO
*/
default_hwif_mmiops(hwif);
hwif->mmio = 1;
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
hwif->hw.io_ports[i] = port;
hwif->io_ports[i] = port;
port += 1 << info->stepping;
}
hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)base + info->ctrloffset;
hwif->io_ports[IDE_CONTROL_OFFSET] = (unsigned long)base + info->ctrloffset;
hwif->hw.irq = ec->irq;
hwif->irq = ec->irq;
hwif->noprobe = 0;
hwif->chipset = ide_acorn;
hwif->gendev.parent = &ec->dev;
}
return hwif;
}
static int __init
icside_register_v5(struct icside_state *state, struct expansion_card *ec)
{
ide_hwif_t *hwif;
void __iomem *base;
base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
ecard_resource_len(ec, ECARD_RES_MEMC));
if (!base)
return -ENOMEM;
state->irq_port = base;
ec->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
ec->irqmask = 1;
ec->irq_data = state;
ec->ops = &icside_ops_arcin_v5;
/*
* Be on the safe side - disable interrupts
*/
icside_irqdisable_arcin_v5(ec, 0);
hwif = icside_setup(base, &icside_cardinfo_v5, ec);
if (!hwif) {
iounmap(base);
return -ENODEV;
}
state->hwif[0] = hwif;
probe_hwif_init(hwif);
create_proc_ide_interfaces();
return 0;
}
static int __init
icside_register_v6(struct icside_state *state, struct expansion_card *ec)
{
ide_hwif_t *hwif, *mate;
void __iomem *ioc_base, *easi_base;
unsigned int sel = 0;
int ret;
ioc_base = ioremap(ecard_resource_start(ec, ECARD_RES_IOCFAST),
ecard_resource_len(ec, ECARD_RES_IOCFAST));
if (!ioc_base) {
ret = -ENOMEM;
goto out;
}
easi_base = ioc_base;
if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
easi_base = ioremap(ecard_resource_start(ec, ECARD_RES_EASI),
ecard_resource_len(ec, ECARD_RES_EASI));
if (!easi_base) {
ret = -ENOMEM;
goto unmap_slot;
}
/*
* Enable access to the EASI region.
*/
sel = 1 << 5;
}
writeb(sel, ioc_base);
ec->irq_data = state;
ec->ops = &icside_ops_arcin_v6;
state->irq_port = easi_base;
state->ioc_base = ioc_base;
/*
* Be on the safe side - disable interrupts
*/
icside_irqdisable_arcin_v6(ec, 0);
/*
* Find and register the interfaces.
*/
hwif = icside_setup(easi_base, &icside_cardinfo_v6_1, ec);
mate = icside_setup(easi_base, &icside_cardinfo_v6_2, ec);
if (!hwif || !mate) {
ret = -ENODEV;
goto unmap_port;
}
state->hwif[0] = hwif;
state->hwif[1] = mate;
hwif->maskproc = icside_maskproc;
hwif->channel = 0;
hwif->hwif_data = state;
hwif->mate = mate;
hwif->serialized = 1;
hwif->config_data = (unsigned long)ioc_base;
hwif->select_data = sel;
hwif->hw.dma = ec->dma;
mate->maskproc = icside_maskproc;
mate->channel = 1;
mate->hwif_data = state;
mate->mate = hwif;
mate->serialized = 1;
mate->config_data = (unsigned long)ioc_base;
mate->select_data = sel | 1;
mate->hw.dma = ec->dma;
if (ec->dma != NO_DMA && !request_dma(ec->dma, hwif->name)) {
icside_dma_init(hwif);
icside_dma_init(mate);
}
probe_hwif_init(hwif);
probe_hwif_init(mate);
create_proc_ide_interfaces();
return 0;
unmap_port:
if (easi_base != ioc_base)
iounmap(easi_base);
unmap_slot:
iounmap(ioc_base);
out:
return ret;
}
static int __devinit
icside_probe(struct expansion_card *ec, const struct ecard_id *id)
{
struct icside_state *state;
void __iomem *idmem;
int ret;
ret = ecard_request_resources(ec);
if (ret)
goto out;
state = kmalloc(sizeof(struct icside_state), GFP_KERNEL);
if (!state) {
ret = -ENOMEM;
goto release;
}
memset(state, 0, sizeof(state));
state->type = ICS_TYPE_NOTYPE;
state->dev = &ec->dev;
idmem = ioremap(ecard_resource_start(ec, ECARD_RES_IOCFAST),
ecard_resource_len(ec, ECARD_RES_IOCFAST));
if (idmem) {
unsigned int type;
type = readb(idmem + ICS_IDENT_OFFSET) & 1;
type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
iounmap(idmem);
state->type = type;
}
switch (state->type) {
case ICS_TYPE_A3IN:
dev_warn(&ec->dev, "A3IN unsupported\n");
ret = -ENODEV;
break;
case ICS_TYPE_A3USER:
dev_warn(&ec->dev, "A3USER unsupported\n");
ret = -ENODEV;
break;
case ICS_TYPE_V5:
ret = icside_register_v5(state, ec);
break;
case ICS_TYPE_V6:
ret = icside_register_v6(state, ec);
break;
default:
dev_warn(&ec->dev, "unknown interface type\n");
ret = -ENODEV;
break;
}
if (ret == 0) {
ecard_set_drvdata(ec, state);
goto out;
}
kfree(state);
release:
ecard_release_resources(ec);
out:
return ret;
}
static void __devexit icside_remove(struct expansion_card *ec)
{
struct icside_state *state = ecard_get_drvdata(ec);
switch (state->type) {
case ICS_TYPE_V5:
/* FIXME: tell IDE to stop using the interface */
/* Disable interrupts */
icside_irqdisable_arcin_v5(ec, 0);
break;
case ICS_TYPE_V6:
/* FIXME: tell IDE to stop using the interface */
if (ec->dma != NO_DMA)
free_dma(ec->dma);
/* Disable interrupts */
icside_irqdisable_arcin_v6(ec, 0);
/* Reset the ROM pointer/EASI selection */
writeb(0, state->ioc_base);
break;
}
ecard_set_drvdata(ec, NULL);
ec->ops = NULL;
ec->irq_data = NULL;
if (state->ioc_base)
iounmap(state->ioc_base);
if (state->ioc_base != state->irq_port)
iounmap(state->irq_port);
kfree(state);
ecard_release_resources(ec);
}
static void icside_shutdown(struct expansion_card *ec)
{
struct icside_state *state = ecard_get_drvdata(ec);
unsigned long flags;
/*
* Disable interrupts from this card. We need to do
* this before disabling EASI since we may be accessing
* this register via that region.
*/
local_irq_save(flags);
ec->ops->irqdisable(ec, 0);
local_irq_restore(flags);
/*
* Reset the ROM pointer so that we can read the ROM
* after a soft reboot. This also disables access to
* the IDE taskfile via the EASI region.
*/
if (state->ioc_base)
writeb(0, state->ioc_base);
}
static const struct ecard_id icside_ids[] = {
{ MANU_ICS, PROD_ICS_IDE },
{ MANU_ICS2, PROD_ICS2_IDE },
{ 0xffff, 0xffff }
};
static struct ecard_driver icside_driver = {
.probe = icside_probe,
.remove = __devexit_p(icside_remove),
.shutdown = icside_shutdown,
.id_table = icside_ids,
.drv = {
.name = "icside",
},
};
static int __init icside_init(void)
{
return ecard_register_driver(&icside_driver);
}
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ICS IDE driver");
module_init(icside_init);