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linux-stable-rt/drivers/ide/pci/sgiioc4.c

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/*
* Copyright (c) 2003-2006 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
#include <linux/ioc4.h>
#include <asm/io.h>
#include <linux/ide.h>
#define DRV_NAME "SGIIOC4"
/* IOC4 Specific Definitions */
#define IOC4_CMD_OFFSET 0x100
#define IOC4_CTRL_OFFSET 0x120
#define IOC4_DMA_OFFSET 0x140
#define IOC4_INTR_OFFSET 0x0
#define IOC4_TIMING 0x00
#define IOC4_DMA_PTR_L 0x01
#define IOC4_DMA_PTR_H 0x02
#define IOC4_DMA_ADDR_L 0x03
#define IOC4_DMA_ADDR_H 0x04
#define IOC4_BC_DEV 0x05
#define IOC4_BC_MEM 0x06
#define IOC4_DMA_CTRL 0x07
#define IOC4_DMA_END_ADDR 0x08
/* Bits in the IOC4 Control/Status Register */
#define IOC4_S_DMA_START 0x01
#define IOC4_S_DMA_STOP 0x02
#define IOC4_S_DMA_DIR 0x04
#define IOC4_S_DMA_ACTIVE 0x08
#define IOC4_S_DMA_ERROR 0x10
#define IOC4_ATA_MEMERR 0x02
/* Read/Write Directions */
#define IOC4_DMA_WRITE 0x04
#define IOC4_DMA_READ 0x00
/* Interrupt Register Offsets */
#define IOC4_INTR_REG 0x03
#define IOC4_INTR_SET 0x05
#define IOC4_INTR_CLEAR 0x07
#define IOC4_IDE_CACHELINE_SIZE 128
#define IOC4_CMD_CTL_BLK_SIZE 0x20
#define IOC4_SUPPORTED_FIRMWARE_REV 46
typedef struct {
u32 timing_reg0;
u32 timing_reg1;
u32 low_mem_ptr;
u32 high_mem_ptr;
u32 low_mem_addr;
u32 high_mem_addr;
u32 dev_byte_count;
u32 mem_byte_count;
u32 status;
} ioc4_dma_regs_t;
/* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
/* IOC4 has only 1 IDE channel */
#define IOC4_PRD_BYTES 16
#define IOC4_PRD_ENTRIES (PAGE_SIZE /(4*IOC4_PRD_BYTES))
static void
sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
unsigned long ctrl_port, unsigned long irq_port)
{
unsigned long reg = data_port;
int i;
/* Registers are word (32 bit) aligned */
for (i = 0; i <= 7; i++)
hw->io_ports_array[i] = reg + i * 4;
if (ctrl_port)
hw->io_ports.ctl_addr = ctrl_port;
if (irq_port)
hw->io_ports.irq_addr = irq_port;
}
static void
sgiioc4_maskproc(ide_drive_t * drive, int mask)
{
writeb(ATA_DEVCTL_OBS | (mask ? 2 : 0),
(void __iomem *)drive->hwif->io_ports.ctl_addr);
}
static int
sgiioc4_checkirq(ide_hwif_t * hwif)
{
unsigned long intr_addr =
hwif->io_ports.irq_addr + IOC4_INTR_REG * 4;
if ((u8)readl((void __iomem *)intr_addr) & 0x03)
return 1;
return 0;
}
static u8 sgiioc4_read_status(ide_hwif_t *);
static int
sgiioc4_clearirq(ide_drive_t * drive)
{
u32 intr_reg;
ide_hwif_t *hwif = HWIF(drive);
struct ide_io_ports *io_ports = &hwif->io_ports;
unsigned long other_ir = io_ports->irq_addr + (IOC4_INTR_REG << 2);
/* Code to check for PCI error conditions */
intr_reg = readl((void __iomem *)other_ir);
if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
/*
* Using sgiioc4_read_status to read the Status register has a
* side effect of clearing the interrupt. The first read should
* clear it if it is set. The second read should return
* a "clear" status if it got cleared. If not, then spin
* for a bit trying to clear it.
*/
u8 stat = sgiioc4_read_status(hwif);
int count = 0;
stat = sgiioc4_read_status(hwif);
while ((stat & 0x80) && (count++ < 100)) {
udelay(1);
stat = sgiioc4_read_status(hwif);
}
if (intr_reg & 0x02) {
struct pci_dev *dev = to_pci_dev(hwif->dev);
/* Error when transferring DMA data on PCI bus */
u32 pci_err_addr_low, pci_err_addr_high,
pci_stat_cmd_reg;
pci_err_addr_low =
readl((void __iomem *)io_ports->irq_addr);
pci_err_addr_high =
readl((void __iomem *)(io_ports->irq_addr + 4));
pci_read_config_dword(dev, PCI_COMMAND,
&pci_stat_cmd_reg);
printk(KERN_ERR
"%s(%s) : PCI Bus Error when doing DMA:"
" status-cmd reg is 0x%x\n",
__func__, drive->name, pci_stat_cmd_reg);
printk(KERN_ERR
"%s(%s) : PCI Error Address is 0x%x%x\n",
__func__, drive->name,
pci_err_addr_high, pci_err_addr_low);
/* Clear the PCI Error indicator */
pci_write_config_dword(dev, PCI_COMMAND, 0x00000146);
}
/* Clear the Interrupt, Error bits on the IOC4 */
writel(0x03, (void __iomem *)other_ir);
intr_reg = readl((void __iomem *)other_ir);
}
return intr_reg & 3;
}
static void sgiioc4_dma_start(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
unsigned int temp_reg = reg | IOC4_S_DMA_START;
writel(temp_reg, (void __iomem *)ioc4_dma_addr);
}
static u32
sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
{
unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
u32 ioc4_dma;
int count;
count = 0;
ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
udelay(1);
ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
}
return ioc4_dma;
}
/* Stops the IOC4 DMA Engine */
static int sgiioc4_dma_end(ide_drive_t *drive)
{
u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
ide_hwif_t *hwif = HWIF(drive);
unsigned long dma_base = hwif->dma_base;
int dma_stat = 0;
unsigned long *ending_dma = ide_get_hwifdata(hwif);
writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));
ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
if (ioc4_dma & IOC4_S_DMA_STOP) {
printk(KERN_ERR
"%s(%s): IOC4 DMA STOP bit is still 1 :"
"ioc4_dma_reg 0x%x\n",
__func__, drive->name, ioc4_dma);
dma_stat = 1;
}
/*
* The IOC4 will DMA 1's to the ending dma area to indicate that
* previous data DMA is complete. This is necessary because of relaxed
* ordering between register reads and DMA writes on the Altix.
*/
while ((cnt++ < 200) && (!valid)) {
for (num = 0; num < 16; num++) {
if (ending_dma[num]) {
valid = 1;
break;
}
}
udelay(1);
}
if (!valid) {
printk(KERN_ERR "%s(%s) : DMA incomplete\n", __func__,
drive->name);
dma_stat = 1;
}
bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));
if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
if (bc_dev > bc_mem + 8) {
printk(KERN_ERR
"%s(%s): WARNING!! byte_count_dev %d "
"!= byte_count_mem %d\n",
__func__, drive->name, bc_dev, bc_mem);
}
}
drive->waiting_for_dma = 0;
ide_destroy_dmatable(drive);
return dma_stat;
}
static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
{
}
/* returns 1 if dma irq issued, 0 otherwise */
static int sgiioc4_dma_test_irq(ide_drive_t *drive)
{
return sgiioc4_checkirq(HWIF(drive));
}
static void sgiioc4_dma_host_set(ide_drive_t *drive, int on)
{
if (!on)
sgiioc4_clearirq(drive);
}
static void
sgiioc4_resetproc(ide_drive_t * drive)
{
sgiioc4_dma_end(drive);
sgiioc4_clearirq(drive);
}
static void
sgiioc4_dma_lost_irq(ide_drive_t * drive)
{
sgiioc4_resetproc(drive);
ide_dma_lost_irq(drive);
}
static u8 sgiioc4_read_status(ide_hwif_t *hwif)
{
unsigned long port = hwif->io_ports.status_addr;
u8 reg = (u8) readb((void __iomem *) port);
if ((port & 0xFFF) == 0x11C) { /* Status register of IOC4 */
if (reg & 0x51) { /* Not busy...check for interrupt */
unsigned long other_ir = port - 0x110;
unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);
/* Clear the Interrupt, Error bits on the IOC4 */
if (intr_reg & 0x03) {
writel(0x03, (void __iomem *) other_ir);
intr_reg = (u32) readl((void __iomem *) other_ir);
}
}
}
return reg;
}
/* Creates a dma map for the scatter-gather list entries */
static int __devinit
ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
void __iomem *virt_dma_base;
int num_ports = sizeof (ioc4_dma_regs_t);
void *pad;
if (dma_base == 0)
return -1;
printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
dma_base, dma_base + num_ports - 1);
if (!request_mem_region(dma_base, num_ports, hwif->name)) {
printk(KERN_ERR
"%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
"ALREADY in use\n",
__func__, hwif->name, (void *) dma_base,
(void *) dma_base + num_ports - 1);
return -1;
}
virt_dma_base = ioremap(dma_base, num_ports);
if (virt_dma_base == NULL) {
printk(KERN_ERR
"%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
__func__, hwif->name, dma_base, dma_base + num_ports - 1);
goto dma_remap_failure;
}
hwif->dma_base = (unsigned long) virt_dma_base;
hwif->dmatable_cpu = pci_alloc_consistent(dev,
IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
&hwif->dmatable_dma);
if (!hwif->dmatable_cpu)
goto dma_pci_alloc_failure;
hwif->sg_max_nents = IOC4_PRD_ENTRIES;
pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
(dma_addr_t *)&hwif->extra_base);
if (pad) {
ide_set_hwifdata(hwif, pad);
return 0;
}
pci_free_consistent(dev, IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
hwif->dmatable_cpu, hwif->dmatable_dma);
printk(KERN_INFO
"%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
__func__, hwif->name);
printk(KERN_INFO
"Changing from DMA to PIO mode for Drive %s\n", hwif->name);
dma_pci_alloc_failure:
iounmap(virt_dma_base);
dma_remap_failure:
release_mem_region(dma_base, num_ports);
return -1;
}
/* Initializes the IOC4 DMA Engine */
static void
sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
{
u32 ioc4_dma;
ide_hwif_t *hwif = HWIF(drive);
unsigned long dma_base = hwif->dma_base;
unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
u32 dma_addr, ending_dma_addr;
ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
printk(KERN_WARNING
"%s(%s):Warning!! DMA from previous transfer was still active\n",
__func__, drive->name);
writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
if (ioc4_dma & IOC4_S_DMA_STOP)
printk(KERN_ERR
"%s(%s) : IOC4 Dma STOP bit is still 1\n",
__func__, drive->name);
}
ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
if (ioc4_dma & IOC4_S_DMA_ERROR) {
printk(KERN_WARNING
"%s(%s) : Warning!! - DMA Error during Previous"
" transfer | status 0x%x\n",
__func__, drive->name, ioc4_dma);
writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
if (ioc4_dma & IOC4_S_DMA_STOP)
printk(KERN_ERR
"%s(%s) : IOC4 DMA STOP bit is still 1\n",
__func__, drive->name);
}
/* Address of the Scatter Gather List */
dma_addr = cpu_to_le32(hwif->dmatable_dma);
writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));
/* Address of the Ending DMA */
memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
ending_dma_addr = cpu_to_le32(hwif->extra_base);
writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));
writel(dma_direction, (void __iomem *)ioc4_dma_addr);
drive->waiting_for_dma = 1;
}
/* IOC4 Scatter Gather list Format */
/* 128 Bit entries to support 64 bit addresses in the future */
/* The Scatter Gather list Entry should be in the BIG-ENDIAN Format */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero | Lower 32 bits- address | */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero |EOL| 15 unused | 16 Bit Length| */
/* --------------------------------------------------------------------- */
/* Creates the scatter gather list, DMA Table */
static unsigned int
sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned int *table = hwif->dmatable_cpu;
unsigned int count = 0, i = 1;
struct scatterlist *sg;
hwif->sg_nents = i = ide_build_sglist(drive, rq);
if (!i)
return 0; /* sglist of length Zero */
sg = hwif->sg_table;
while (i && sg_dma_len(sg)) {
dma_addr_t cur_addr;
int cur_len;
cur_addr = sg_dma_address(sg);
cur_len = sg_dma_len(sg);
while (cur_len) {
if (count++ >= IOC4_PRD_ENTRIES) {
printk(KERN_WARNING
"%s: DMA table too small\n",
drive->name);
goto use_pio_instead;
} else {
u32 bcount =
0x10000 - (cur_addr & 0xffff);
if (bcount > cur_len)
bcount = cur_len;
/* put the addr, length in
* the IOC4 dma-table format */
*table = 0x0;
table++;
*table = cpu_to_be32(cur_addr);
table++;
*table = 0x0;
table++;
*table = cpu_to_be32(bcount);
table++;
cur_addr += bcount;
cur_len -= bcount;
}
}
sg = sg_next(sg);
i--;
}
if (count) {
table--;
*table |= cpu_to_be32(0x80000000);
return count;
}
use_pio_instead:
ide_destroy_dmatable(drive);
return 0; /* revert to PIO for this request */
}
static int sgiioc4_dma_setup(ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
unsigned int count = 0;
int ddir;
if (rq_data_dir(rq))
ddir = PCI_DMA_TODEVICE;
else
ddir = PCI_DMA_FROMDEVICE;
if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
/* try PIO instead of DMA */
ide_map_sg(drive, rq);
return 1;
}
if (rq_data_dir(rq))
/* Writes TO the IOC4 FROM Main Memory */
ddir = IOC4_DMA_READ;
else
/* Writes FROM the IOC4 TO Main Memory */
ddir = IOC4_DMA_WRITE;
sgiioc4_configure_for_dma(ddir, drive);
return 0;
}
static const struct ide_tp_ops sgiioc4_tp_ops = {
.exec_command = ide_exec_command,
.read_status = sgiioc4_read_status,
.read_altstatus = ide_read_altstatus,
.read_sff_dma_status = ide_read_sff_dma_status,
.set_irq = ide_set_irq,
.tf_load = ide_tf_load,
.tf_read = ide_tf_read,
.input_data = ide_input_data,
.output_data = ide_output_data,
};
static const struct ide_port_ops sgiioc4_port_ops = {
.set_dma_mode = sgiioc4_set_dma_mode,
/* reset DMA engine, clear IRQs */
.resetproc = sgiioc4_resetproc,
/* mask on/off NIEN register */
.maskproc = sgiioc4_maskproc,
};
static const struct ide_dma_ops sgiioc4_dma_ops = {
.dma_host_set = sgiioc4_dma_host_set,
.dma_setup = sgiioc4_dma_setup,
.dma_start = sgiioc4_dma_start,
.dma_end = sgiioc4_dma_end,
.dma_test_irq = sgiioc4_dma_test_irq,
.dma_lost_irq = sgiioc4_dma_lost_irq,
.dma_timeout = ide_dma_timeout,
};
static const struct ide_port_info sgiioc4_port_info __devinitdata = {
.name = DRV_NAME,
.chipset = ide_pci,
.init_dma = ide_dma_sgiioc4,
.tp_ops = &sgiioc4_tp_ops,
.port_ops = &sgiioc4_port_ops,
.dma_ops = &sgiioc4_dma_ops,
.host_flags = IDE_HFLAG_MMIO,
.mwdma_mask = ATA_MWDMA2_ONLY,
};
static int __devinit
sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
{
unsigned long cmd_base, irqport;
unsigned long bar0, cmd_phys_base, ctl;
void __iomem *virt_base;
struct ide_host *host;
hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
struct ide_port_info d = sgiioc4_port_info;
int rc;
/* Get the CmdBlk and CtrlBlk Base Registers */
bar0 = pci_resource_start(dev, 0);
virt_base = ioremap(bar0, pci_resource_len(dev, 0));
if (virt_base == NULL) {
printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
DRV_NAME, bar0);
return -ENOMEM;
}
cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
DRV_NAME)) {
printk(KERN_ERR
"%s : %s -- ERROR, Addresses "
"0x%p to 0x%p ALREADY in use\n",
__func__, DRV_NAME, (void *) cmd_phys_base,
(void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
return -ENOMEM;
}
/* Initialize the IO registers */
memset(&hw, 0, sizeof(hw));
sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
hw.irq = dev->irq;
hw.chipset = ide_pci;
hw.dev = &dev->dev;
/* Initializing chipset IRQ Registers */
writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
host = ide_host_alloc(&d, hws);
if (host == NULL) {
rc = -ENOMEM;
goto err;
}
rc = ide_host_register(host, &d, hws);
if (rc)
goto err_free;
return 0;
err_free:
ide_host_free(host);
err:
release_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE);
iounmap(virt_base);
return rc;
}
static unsigned int __devinit
pci_init_sgiioc4(struct pci_dev *dev)
{
int ret;
printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
DRV_NAME, pci_name(dev), dev->revision);
if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
"firmware is obsolete - please upgrade to "
"revision46 or higher\n",
DRV_NAME, pci_name(dev));
ret = -EAGAIN;
goto out;
}
ret = sgiioc4_ide_setup_pci_device(dev);
out:
return ret;
}
int
ioc4_ide_attach_one(struct ioc4_driver_data *idd)
{
/* PCI-RT does not bring out IDE connection.
* Do not attach to this particular IOC4.
*/
if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
return 0;
return pci_init_sgiioc4(idd->idd_pdev);
}
static struct ioc4_submodule ioc4_ide_submodule = {
.is_name = "IOC4_ide",
.is_owner = THIS_MODULE,
.is_probe = ioc4_ide_attach_one,
/* .is_remove = ioc4_ide_remove_one, */
};
static int __init ioc4_ide_init(void)
{
return ioc4_register_submodule(&ioc4_ide_submodule);
}
late_initcall(ioc4_ide_init); /* Call only after IDE init is done */
MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
MODULE_LICENSE("GPL");
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