Re: Patch to add support for SGI's IOC4 chipset

From: Aniket Malatpure
Date: Fri Oct 03 2003 - 20:54:13 EST

Hi

Please find attached a newer version of the patch I sent out earlier today.
This patch has exactly the same code as earlier, it is just formatted in a
neater way.
(We realized this after an internal review of my code).

Please merge this patch if there are no other issues.

Thanks
Aniket# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.1433 -> 1.1435
# drivers/ide/pci/Makefile 1.8 -> 1.9
# include/linux/pci_ids.h 1.123 -> 1.124
# drivers/ide/Kconfig 1.29 -> 1.30
# (new) -> 1.2 drivers/ide/pci/sgiioc4.c
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/10/03 aniket@xxxxxxxxxxxxxxxxxxxxx 1.1434
# Adds support for the IOC4 IDE part.
# --------------------------------------------
# 03/10/03 aniket@xxxxxxxxxxxxxxxxxxxxx 1.1435
# Formatted the driver to make it neat
# --------------------------------------------
#
diff -Nru a/drivers/ide/Kconfig b/drivers/ide/Kconfig
--- a/drivers/ide/Kconfig Fri Oct 3 18:47:33 2003
+++ b/drivers/ide/Kconfig Fri Oct 3 18:47:33 2003
@@ -740,6 +740,13 @@
This driver adds PIO/(U)DMA support for the ServerWorks OSB4/CSB5
chipsets.

+config BLK_DEV_SGIIOC4
+ tristate "Silicon Graphics IOC4 chipset support"
+ help
+ This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
+ chipset. Please say Y here, if you have an Altix System from
+ Silicon Graphics Inc.
+
config BLK_DEV_SIIMAGE
tristate "Silicon Image chipset support"
help
diff -Nru a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
--- a/drivers/ide/pci/Makefile Fri Oct 3 18:47:33 2003
+++ b/drivers/ide/pci/Makefile Fri Oct 3 18:47:33 2003
@@ -22,6 +22,7 @@
obj-$(CONFIG_BLK_DEV_PIIX) += piix.o
obj-$(CONFIG_BLK_DEV_RZ1000) += rz1000.o
obj-$(CONFIG_BLK_DEV_SVWKS) += serverworks.o
+obj-$(CONFIG_BLK_DEV_SGIIOC4) += sgiioc4.o
obj-$(CONFIG_BLK_DEV_SIIMAGE) += siimage.o
obj-$(CONFIG_BLK_DEV_SIS5513) += sis5513.o
obj-$(CONFIG_BLK_DEV_SL82C105) += sl82c105.o
diff -Nru a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/ide/pci/sgiioc4.c Fri Oct 3 18:47:33 2003
@@ -0,0 +1,1053 @@
+/*
+ * Copyright (c) 2003 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.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan
+ */
+
+#include <linux/config.h>
+#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/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <asm/io.h>
+
+#define IDE_ARCH_ACK_INTR 1
+#include <linux/ide.h>
+
+/* 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
+
+/* Weeds out non-IDE interrupts to the IOC4 */
+#define ide_ack_intr(hwif) ((hwif)->hw.ack_intr ? (hwif)->hw.ack_intr(hwif) : 1)
+
+#define SGIIOC4_MAX_DEVS 32
+
+#if defined(CONFIG_PROC_FS)
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+
+static u8 sgiioc4_proc;
+
+static struct pci_dev *sgiioc4_devs[SGIIOC4_MAX_DEVS];
+static int sgiioc4_get_info(char *, char **, off_t, int);
+
+static ide_pci_host_proc_t sgiioc4_procs[] __initdata = {
+ {
+ .name = "sgiioc4",
+ .set = 1,
+ .get_info = sgiioc4_get_info,
+ .parent = NULL,
+ }
+};
+#endif
+
+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))
+
+typedef enum pciio_endian_e {
+ PCIDMA_ENDIAN_BIG,
+ PCIDMA_ENDIAN_LITTLE
+} pciio_endian_t;
+
+static void sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
+ unsigned long ctrl_port,
+ unsigned long irq_port);
+static void sgiioc4_ide_setup_pci_device(struct pci_dev *dev,
+ ide_pci_device_t * d);
+static void sgiioc4_resetproc(ide_drive_t * drive);
+static void sgiioc4_maskproc(ide_drive_t * drive, int mask);
+static void sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive);
+static void __init ide_init_sgiioc4(ide_hwif_t * hwif);
+static void __init ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base);
+static int sgiioc4_checkirq(ide_hwif_t * hwif);
+static int sgiioc4_clearirq(ide_drive_t * drive);
+static int sgiioc4_get_info(char *buffer, char **addr, off_t offset, int count);
+static int sgiioc4_ide_dma_read(ide_drive_t * drive);
+static int sgiioc4_ide_dma_write(ide_drive_t * drive);
+static int sgiioc4_ide_dma_begin(ide_drive_t * drive);
+static int sgiioc4_ide_dma_end(ide_drive_t * drive);
+static int sgiioc4_ide_dma_check(ide_drive_t * drive);
+static int sgiioc4_ide_dma_on(ide_drive_t * drive);
+static int sgiioc4_ide_dma_off(ide_drive_t * drive);
+static int sgiioc4_ide_dma_off_quietly(ide_drive_t * drive);
+static int sgiioc4_ide_dma_test_irq(ide_drive_t * drive);
+static int sgiioc4_ide_dma_host_on(ide_drive_t * drive);
+static int sgiioc4_ide_dma_host_off(ide_drive_t * drive);
+static int sgiioc4_ide_dma_count(ide_drive_t * drive);
+static int sgiioc4_ide_dma_verbose(ide_drive_t * drive);
+static int sgiioc4_ide_dma_lostirq(ide_drive_t * drive);
+static int sgiioc4_ide_dma_timeout(ide_drive_t * drive);
+static int sgiioc4_ide_build_sglist(ide_drive_t * drive, struct request *rq);
+static int sgiioc4_ide_raw_build_sglist(ide_drive_t * drive,
+ struct request *rq);
+static u8 sgiioc4_INB(unsigned long port);
+static inline void xide_delay(long ticks);
+static unsigned int sgiioc4_build_dma_table(ide_drive_t * drive,
+ struct request *rq, int ddir);
+static unsigned int __init pci_init_sgiioc4(struct pci_dev *dev,
+ ide_pci_device_t * d);
+
+static ide_pci_device_t sgiioc4_chipsets[] __devinitdata = {
+ {
+ /* Channel 0 */
+ .vendor = PCI_VENDOR_ID_SGI,
+ .device = PCI_DEVICE_ID_SGI_IOC4,
+ .name = "SGIIOC4",
+ .init_chipset = NULL,
+ .init_iops = NULL,
+ .init_hwif = ide_init_sgiioc4,
+ .init_dma = ide_dma_sgiioc4,
+ .channels = 1,
+ .autodma = AUTODMA,
+ .enablebits = {{0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}},
+ .bootable = ON_BOARD,
+ .extra = 0,
+ }
+};
+
+#ifdef CONFIG_PROC_FS
+static u8 sgiioc4_proc;
+#endif /* CONFIG_PROC_FS */
+
+static int n_sgiioc4_devs;
+
+static inline void
+xide_delay(long ticks)
+{
+ if (!ticks)
+ return;
+
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(ticks);
+}
+static void __init
+sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
+{
+ unsigned long base = 0, ctl = 0, dma_base = 0, irqport = 0;
+ ide_hwif_t *hwif = NULL;
+ int h = 0;
+
+ /* Get the CmdBlk and CtrlBlk Base Registers */
+ base = pci_resource_start(dev, 0) + IOC4_CMD_OFFSET;
+ ctl = pci_resource_start(dev, 0) + IOC4_CTRL_OFFSET;
+ irqport = pci_resource_start(dev, 0) + IOC4_INTR_OFFSET;
+ dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
+
+ if (!request_region(base, IOC4_CMD_CTL_BLK_SIZE, hwif->name)) {
+ printk(KERN_ERR
+ "%s : %s -- Warning, Port Addresses "
+ "0x%p to 0x%p ALREADY in use\n",
+ __FUNCTION__, hwif->name, (void *) base,
+ (void *) base + IOC4_CMD_CTL_BLK_SIZE);
+ }
+
+ for (h = 0; h < MAX_HWIFS; ++h) {
+ hwif = &ide_hwifs[h];
+ /* Find an empty HWIF */
+ if (hwif->chipset == ide_unknown)
+ break;
+ }
+
+ if (hwif->io_ports[IDE_DATA_OFFSET] != base) {
+ /* Initialize the IO registers */
+ sgiioc4_init_hwif_ports(&hwif->hw, base, ctl, irqport);
+ memcpy(hwif->io_ports, hwif->hw.io_ports,
+ sizeof (hwif->io_ports));
+ hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+ }
+
+ hwif->irq = dev->irq;
+ hwif->chipset = ide_pci;
+ hwif->pci_dev = dev;
+ hwif->channel = 0; /* Single Channel chip */
+ hwif->cds = (struct ide_pci_device_s *) d;
+ hwif->hw.ack_intr = &sgiioc4_checkirq; /* MultiFunction Chip */
+ hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
+
+ /* Initializing chipset IRQ Registers */
+ hwif->OUTL(0x03, irqport + IOC4_INTR_SET * 4);
+
+ (void) ide_init_sgiioc4(hwif);
+
+ if (dma_base)
+ ide_dma_sgiioc4(hwif, dma_base);
+ else
+ printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
+ hwif->name, d->name);
+
+ probe_hwif_init(hwif);
+}
+
+/* This ensures that we can build this for generic kernels without
+ * having all the SN2 code sync'd and merged.
+ */
+
+pciio_endian_t __attribute__ ((weak)) snia_pciio_endian_set(struct pci_dev
+ *pci_dev, pciio_endian_t device_end,
+ pciio_endian_t desired_end);
+
+static unsigned int __init
+pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
+{
+ if (pci_enable_device(dev)) {
+ printk(KERN_INFO
+ "Failed to enable device %s at slot %s\n",
+ d->name, dev->slot_name);
+ return 1;
+ }
+ pci_set_master(dev);
+
+ /* Enable Byte Swapping in the PIC... */
+ if (snia_pciio_endian_set) {
+ snia_pciio_endian_set(dev, PCIDMA_ENDIAN_LITTLE,
+ PCIDMA_ENDIAN_BIG);
+ } else {
+ printk(KERN_INFO
+ "Failed to set endianness for device %s at slot %s\n",
+ d->name, dev->slot_name);
+ return 1;
+ }
+
+#ifdef CONFIG_PROC_FS
+ sgiioc4_devs[n_sgiioc4_devs++] = dev;
+ if (!sgiioc4_proc) {
+ sgiioc4_proc = 1;
+ ide_pci_register_host_proc(&sgiioc4_procs[0]);
+ }
+#endif
+ sgiioc4_ide_setup_pci_device(dev, d);
+
+ return 0;
+}
+
+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 = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
+ hw->io_ports[i] = reg + i * 4;
+
+ if (ctrl_port)
+ hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
+
+ if (irq_port)
+ hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
+}
+
+static void
+sgiioc4_resetproc(ide_drive_t * drive)
+{
+ sgiioc4_ide_dma_end(drive);
+ sgiioc4_clearirq(drive);
+}
+
+static void
+sgiioc4_maskproc(ide_drive_t * drive, int mask)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ hwif->OUTB(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
+ IDE_CONTROL_REG);
+}
+
+static void __init
+ide_init_sgiioc4(ide_hwif_t * hwif)
+{
+ hwif->mmio = 2;
+ hwif->autodma = 1;
+ hwif->atapi_dma = 1;
+ hwif->ultra_mask = 0x0; /* Disable Ultra DMA */
+ hwif->mwdma_mask = 0x2; /* Multimode-2 DMA */
+ hwif->swdma_mask = 0x2;
+ hwif->identify = NULL;
+ hwif->tuneproc = NULL; /* Sets timing for PIO mode */
+ hwif->speedproc = NULL; /* Sets timing for DMA &/or PIO modes */
+ hwif->selectproc = NULL;/* Use the default routine to select drive */
+ hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
+ hwif->pre_reset = NULL; /* No HBA specific pre_set needed */
+ hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
+ clear interrupts */
+ hwif->intrproc = NULL; /* Enable or Disable interrupt from drive */
+ hwif->maskproc = &sgiioc4_maskproc; /* Mask on/off NIEN register */
+ hwif->quirkproc = NULL;
+ hwif->busproc = NULL;
+
+ hwif->ide_dma_read = &sgiioc4_ide_dma_read;
+ hwif->ide_dma_write = &sgiioc4_ide_dma_write;
+ hwif->ide_dma_begin = &sgiioc4_ide_dma_begin;
+ hwif->ide_dma_end = &sgiioc4_ide_dma_end;
+ hwif->ide_dma_check = &sgiioc4_ide_dma_check;
+ hwif->ide_dma_on = &sgiioc4_ide_dma_on;
+ hwif->ide_dma_off = &sgiioc4_ide_dma_off;
+ hwif->ide_dma_off_quietly = &sgiioc4_ide_dma_off_quietly;
+ hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
+ hwif->ide_dma_host_on = &sgiioc4_ide_dma_host_on;
+ hwif->ide_dma_host_off = &sgiioc4_ide_dma_host_off;
+ hwif->ide_dma_bad_drive = &__ide_dma_bad_drive;
+ hwif->ide_dma_good_drive = &__ide_dma_good_drive;
+ hwif->ide_dma_count = &sgiioc4_ide_dma_count;
+ hwif->ide_dma_verbose = &sgiioc4_ide_dma_verbose;
+ hwif->ide_dma_retune = &__ide_dma_retune;
+ hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
+ hwif->ide_dma_timeout = &sgiioc4_ide_dma_timeout;
+ hwif->INB = &sgiioc4_INB;
+}
+
+static int
+sgiioc4_ide_dma_read(ide_drive_t * drive)
+{
+ struct request *rq = HWGROUP(drive)->rq;
+ unsigned int count = 0;
+
+ if (!(count = sgiioc4_build_dma_table(drive, rq, PCI_DMA_FROMDEVICE))) {
+ /* try PIO instead of DMA */
+ return 1;
+ }
+ /* Writes FROM the IOC4 TO Main Memory */
+ sgiioc4_configure_for_dma(IOC4_DMA_WRITE, drive);
+
+ return 0;
+}
+
+static int
+sgiioc4_ide_dma_write(ide_drive_t * drive)
+{
+ struct request *rq = HWGROUP(drive)->rq;
+ unsigned int count = 0;
+
+ if (!(count = sgiioc4_build_dma_table(drive, rq, PCI_DMA_TODEVICE))) {
+ /* try PIO instead of DMA */
+ return 1;
+ }
+
+ sgiioc4_configure_for_dma(IOC4_DMA_READ, drive);
+ /* Writes TO the IOC4 FROM Main Memory */
+
+ return 0;
+}
+
+static int
+sgiioc4_ide_dma_begin(ide_drive_t * drive)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ unsigned int reg = hwif->INL(hwif->dma_base + IOC4_DMA_CTRL * 4);
+ unsigned int temp_reg = reg | IOC4_S_DMA_START;
+
+ hwif->OUTL(temp_reg, hwif->dma_base + IOC4_DMA_CTRL * 4);
+
+ return 0;
+}
+
+/* Stops the IOC4 DMA Engine */
+static int
+sgiioc4_ide_dma_end(ide_drive_t * drive)
+{
+ u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
+ ide_hwif_t *hwif = HWIF(drive);
+ uint64_t dma_base = hwif->dma_base;
+ int dma_stat = 0, count;
+ unsigned long *ending_dma = (unsigned long *) hwif->dma_base2;
+
+ hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+
+ count = 0;
+ do {
+ xide_delay(count);
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ count += 10;
+ } while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+
+ 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",
+ __FUNCTION__, drive->name, ioc4_dma);
+ dma_stat = 1;
+ }
+
+ if (ending_dma) {
+ do {
+ for (num = 0; num < 16; num++) {
+ if (ending_dma[num] & (~0ul)) {
+ valid = 1;
+ break;
+ }
+ }
+ xide_delay(cnt);
+ } while ((cnt++ < 100) && (!valid));
+ }
+
+ if (!valid)
+ printk(KERN_INFO "%s(%s) : Stale DMA Data in Memory\n",
+ __FUNCTION__, drive->name);
+
+ bc_dev = hwif->INL(dma_base + IOC4_BC_DEV * 4);
+ bc_mem = hwif->INL(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",
+ __FUNCTION__, drive->name, bc_dev, bc_mem);
+ }
+ }
+
+ drive->waiting_for_dma = 0;
+ ide_destroy_dmatable(drive);
+
+ return dma_stat;
+}
+
+static int
+sgiioc4_ide_dma_check(ide_drive_t * drive)
+{
+ if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
+ printk(KERN_INFO
+ "Couldnot set %s in Multimode-2 DMA mode | "
+ "Drive %s using PIO instead\n",
+ drive->name, drive->name);
+ drive->using_dma = 0;
+ } else
+ drive->using_dma = 1;
+
+ return 0;
+}
+
+static int
+sgiioc4_ide_dma_on(ide_drive_t * drive)
+{
+ drive->using_dma = 1;
+
+ return HWIF(drive)->ide_dma_host_on(drive);
+}
+
+static int
+sgiioc4_ide_dma_off(ide_drive_t * drive)
+{
+ printk(KERN_INFO "%s: DMA disabled\n", drive->name);
+
+ return HWIF(drive)->ide_dma_off_quietly(drive);
+}
+
+static int
+sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
+{
+ drive->using_dma = 0;
+
+ return HWIF(drive)->ide_dma_host_off(drive);
+}
+
+/* returns 1 if dma irq issued, 0 otherwise */
+static int
+sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
+{
+ return sgiioc4_checkirq(HWIF(drive));
+}
+
+static int
+sgiioc4_ide_dma_host_on(ide_drive_t * drive)
+{
+ if (drive->using_dma)
+ return 0;
+
+ return 1;
+}
+
+static int
+sgiioc4_ide_dma_host_off(ide_drive_t * drive)
+{
+ sgiioc4_clearirq(drive);
+
+ return 0;
+}
+
+static int
+sgiioc4_ide_dma_count(ide_drive_t * drive)
+{
+ return HWIF(drive)->ide_dma_begin(drive);
+}
+
+static int
+sgiioc4_ide_dma_verbose(ide_drive_t * drive)
+{
+ if (drive->using_dma == 1)
+ printk(", UDMA(16)");
+ else
+ printk(", PIO");
+
+ return 1;
+}
+
+static int
+sgiioc4_ide_dma_lostirq(ide_drive_t * drive)
+{
+ HWIF(drive)->resetproc(drive);
+
+ return __ide_dma_lostirq(drive);
+}
+
+static int
+sgiioc4_ide_dma_timeout(ide_drive_t * drive)
+{
+ printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
+ if (HWIF(drive)->ide_dma_test_irq(drive))
+ return 0;
+
+ return HWIF(drive)->ide_dma_end(drive);
+}
+
+static u8
+sgiioc4_INB(unsigned long port)
+{
+ u8 reg = (u8) inb(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) inl(other_ir);
+
+ /* Clear the Interrupt, Error bits on the IOC4 */
+ if (intr_reg & 0x03) {
+ outl(0x03, other_ir);
+ intr_reg = (u32) inl(other_ir);
+ }
+ }
+ }
+
+ return reg;
+}
+
+/* Creates a dma map for the scatter-gather list entries */
+static void __init
+ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
+{
+ int num_ports = sizeof (ioc4_dma_regs_t);
+
+ printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
+ dma_base, dma_base + num_ports - 1);
+
+ if (!request_region(dma_base, num_ports, hwif->name)) {
+ printk(KERN_ERR
+ "%s(%s) -- WARNING, Addresses 0x%p to 0x%p "
+ "ALREADY in use\n",
+ __FUNCTION__, hwif->name, (void *) dma_base,
+ (void *) dma_base + num_ports - 1);
+ }
+
+ hwif->dma_base = dma_base;
+ hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
+ IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+ &hwif->dmatable_dma);
+
+ if (!hwif->dmatable_cpu)
+ goto dma_alloc_failure;
+
+ hwif->sg_table =
+ kmalloc(sizeof (struct scatterlist) * IOC4_PRD_ENTRIES, GFP_KERNEL);
+
+ if (!hwif->sg_table) {
+ pci_free_consistent(hwif->pci_dev,
+ IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+ hwif->dmatable_cpu, hwif->dmatable_dma);
+ goto dma_alloc_failure;
+ }
+
+ hwif->dma_base2 = (unsigned long)
+ pci_alloc_consistent(hwif->pci_dev,
+ IOC4_IDE_CACHELINE_SIZE,
+ (dma_addr_t *) &(hwif->dma_status));
+
+ if (!hwif->dma_base2) {
+ pci_free_consistent(hwif->pci_dev,
+ IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+ hwif->dmatable_cpu, hwif->dmatable_dma);
+ kfree(hwif->sg_table);
+ goto dma_alloc_failure;
+ }
+
+ return;
+
+ dma_alloc_failure:
+ printk(KERN_INFO
+ "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
+ __FUNCTION__, hwif->name);
+ printk(KERN_INFO
+ "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
+
+ /* Disable DMA because we couldnot allocate any DMA maps */
+ hwif->autodma = 0;
+ hwif->atapi_dma = 0;
+}
+
+/* Initializes the IOC4 DMA Engine */
+static void
+sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
+{
+ u32 ioc4_dma;
+ int count;
+ ide_hwif_t *hwif = HWIF(drive);
+ uint64_t dma_base = hwif->dma_base;
+ uint32_t dma_addr, ending_dma_addr;
+
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+
+ if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
+ printk(KERN_WARNING
+ "%s(%s):Warning!! DMA from previous transfer was still active\n",
+ __FUNCTION__, drive->name);
+ hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+ count = 0;
+ do {
+ xide_delay(count);
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ count += 10;
+ } while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+
+ if (ioc4_dma & IOC4_S_DMA_STOP)
+ printk(KERN_ERR
+ "%s(%s) : IOC4 Dma STOP bit is still 1\n",
+ __FUNCTION__, drive->name);
+ }
+
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ if (ioc4_dma & IOC4_S_DMA_ERROR) {
+ printk(KERN_WARNING
+ "%s(%s) : Warning!! - DMA Error during Previous"
+ " transfer | status 0x%x\n",
+ __FUNCTION__, drive->name, ioc4_dma);
+ hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+ count = 0;
+ do {
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ xide_delay(count);
+ count += 10;
+ } while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+
+ if (ioc4_dma & IOC4_S_DMA_STOP)
+ printk(KERN_ERR
+ "%s(%s) : IOC4 DMA STOP bit is still 1\n",
+ __FUNCTION__, drive->name);
+ }
+
+ /* Address of the Scatter Gather List */
+ dma_addr = cpu_to_le32(hwif->dmatable_dma);
+ hwif->OUTL(dma_addr, dma_base + IOC4_DMA_PTR_L * 4);
+
+ /* Address of the Ending DMA */
+ memset((unsigned int *) hwif->dma_base2, 0, IOC4_IDE_CACHELINE_SIZE);
+ ending_dma_addr = cpu_to_le32(hwif->dma_status);
+ hwif->OUTL(ending_dma_addr, dma_base + IOC4_DMA_END_ADDR * 4);
+
+ hwif->OUTL(dma_direction, dma_base + IOC4_DMA_CTRL * 4);
+ 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;
+
+ if (HWGROUP(drive)->rq->flags & REQ_DRIVE_TASKFILE)
+ hwif->sg_nents = i = sgiioc4_ide_raw_build_sglist(drive, rq);
+ else
+ hwif->sg_nents = i = sgiioc4_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 {
+ uint32_t xcount, 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++;
+
+ xcount = bcount & 0xffff;
+ *table = cpu_to_be32(xcount);
+ table++;
+
+ cur_addr += bcount;
+ cur_len -= bcount;
+ }
+ }
+
+ sg++;
+ i--;
+ }
+
+ if (count) {
+ table--;
+ *table |= cpu_to_be32(0x80000000);
+ return count;
+ }
+
+ use_pio_instead:
+ pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
+ hwif->sg_dma_direction);
+ hwif->sg_dma_active = 0;
+
+ return 0; /* revert to PIO for this request */
+}
+
+static int
+sgiioc4_checkirq(ide_hwif_t * hwif)
+{
+ uint8_t intr_reg =
+ hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + IOC4_INTR_REG * 4);
+
+ if (intr_reg & 0x03)
+ return 1;
+
+ return 0;
+}
+
+static int
+sgiioc4_clearirq(ide_drive_t * drive)
+{
+ u32 intr_reg;
+ ide_hwif_t *hwif = HWIF(drive);
+ unsigned long other_ir =
+ hwif->io_ports[IDE_IRQ_OFFSET] + (IOC4_INTR_REG << 2);
+
+ /* Code to check for PCI error conditions */
+ intr_reg = hwif->INL(other_ir);
+ if (intr_reg & 0x03) {
+ /* Valid IOC4-IDE interrupt */
+ u8 stat = hwif->INB(IDE_STATUS_REG);
+ int count = 0;
+ do {
+ xide_delay(count);
+ stat = hwif->INB(IDE_STATUS_REG);
+ /* Removes Interrupt from IDE Device */
+ } while ((stat & 0x80) && (count++ < 1024));
+
+ if (intr_reg & 0x02) {
+ /* Error when transferring DMA data on PCI bus */
+ uint32_t pci_err_addr_low, pci_err_addr_high,
+ pci_stat_cmd_reg;
+
+ pci_err_addr_low =
+ hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET]);
+ pci_err_addr_high =
+ hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + 4);
+ pci_read_config_dword(hwif->pci_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",
+ __FUNCTION__, drive->name, pci_stat_cmd_reg);
+ printk(KERN_ERR
+ "%s(%s) : PCI Error Address is 0x%x%x\n",
+ __FUNCTION__, drive->name,
+ pci_err_addr_high, pci_err_addr_low);
+ /* Clear the PCI Error indicator */
+ pci_write_config_dword(hwif->pci_dev, PCI_COMMAND,
+ 0x00000146);
+ }
+
+ /* Clear the Interrupt, Error bits on the IOC4 */
+ hwif->OUTL(0x03, other_ir);
+
+ intr_reg = hwif->INL(other_ir);
+ }
+
+ return intr_reg;
+}
+
+/**
+ * "Copied from drivers/ide/ide-dma.c"
+ * sgiioc4_ide_build_sglist - map IDE scatter gather for DMA I/O
+ * @hwif: the interface to build the DMA table for
+ * @rq: the request holding the sg list
+ * @ddir: data direction
+ *
+ * Perform the PCI mapping magic neccessary to access the source
+ * or target buffers of a request via PCI DMA. The lower layers
+ * of the kernel provide the neccessary cache management so that
+ * we can operate in a portable fashion.
+ *
+ * This code is identical to ide_build_sglist in ide-dma.c
+ * however that is not exported.
+ */
+
+static int
+sgiioc4_ide_build_sglist(ide_drive_t * drive, struct request *rq)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ struct scatterlist *sg = hwif->sg_table;
+ int nents;
+
+ if (hwif->sg_dma_active)
+ BUG();
+
+ nents = blk_rq_map_sg(drive->queue, rq, hwif->sg_table);
+
+ if (rq_data_dir(rq) == READ)
+ hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
+ else
+ hwif->sg_dma_direction = PCI_DMA_TODEVICE;
+
+ return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
+}
+
+/**
+ * Copied from drivers/ide/ide-dma.c
+ * sgiioc4_ide_raw_build_sglist - map IDE scatter gather for DMA
+ * @hwif: the interface to build the DMA table for
+ * @rq: the request holding the sg list
+ *
+ * Perform the PCI mapping magic neccessary to access the source or
+ * target buffers of a taskfile request via PCI DMA. The lower layers
+ * of the kernel provide the neccessary cache management so that we can
+ * operate in a portable fashion
+ *
+ * This code is identical to ide_raw_build_sglist in ide-dma.c
+ * however that is not exported
+ */
+
+static int
+sgiioc4_ide_raw_build_sglist(ide_drive_t * drive, struct request *rq)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ struct scatterlist *sg = hwif->sg_table;
+ int nents = 0;
+ ide_task_t *args = rq->special;
+ u8 *virt_addr = rq->buffer;
+ int sector_count = rq->nr_sectors;
+
+ if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
+ hwif->sg_dma_direction = PCI_DMA_TODEVICE;
+ else
+ hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
+
+#if 1
+ if (sector_count > 256)
+ BUG();
+
+ if (sector_count > 128) {
+#else
+ while (sector_count > 128) {
+#endif
+ memset(&sg[nents], 0, sizeof (*sg));
+ sg[nents].page = virt_to_page(virt_addr);
+ sg[nents].offset = offset_in_page(virt_addr);
+ sg[nents].length = 128 * SECTOR_SIZE;
+ nents++;
+ virt_addr = virt_addr + (128 * SECTOR_SIZE);
+ sector_count -= 128;
+ }
+ memset(&sg[nents], 0, sizeof (*sg));
+ sg[nents].page = virt_to_page(virt_addr);
+ sg[nents].offset = offset_in_page(virt_addr);
+ sg[nents].length = sector_count * SECTOR_SIZE;
+ nents++;
+
+ return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
+}
+
+#ifdef CONFIG_PROC_FS
+
+static int
+sgiioc4_get_info(char *buffer, char **addr, off_t offset, int count)
+{
+ char *p = buffer;
+ unsigned int class_rev;
+ int i = 0;
+
+ while (i < n_sgiioc4_devs) {
+ pci_read_config_dword(sgiioc4_devs[i], PCI_CLASS_REVISION, &class_rev);
+ class_rev &= 0xff;
+
+ if (sgiioc4_devs[i]->device == PCI_DEVICE_ID_SGI_IOC4) {
+ p += sprintf(p,
+ "\n\tSGI IOC4 Chipset rev %d.\n\t"
+ "Chipset has 1 IDE channel and supports 2 devices on that channel.\n\t"
+ "Chipset supports DMA in MultiMode-2 data transfer protocol.\n",
+ class_rev);
+ /* Do we need more info. here? */
+ }
+ i++;
+ }
+
+ return p - buffer;
+}
+
+#endif /* CONFIG_PROC_FS */
+
+static int __devinit
+sgiioc4_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ unsigned int class_rev;
+ ide_pci_device_t *d = &sgiioc4_chipsets[id->driver_data];
+ if (dev->device != d->device) {
+ printk(KERN_ERR "Error in %s(dev 0x%p | id 0x%p )\n",
+ __FUNCTION__, (void *) dev, (void *) id);
+ BUG();
+ }
+
+ pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+ class_rev &= 0xff;
+
+ if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
+ printk(KERN_INFO
+ "Disabling IOC4 IDE Part due to "
+ "unsupported Firmware Rev (%d)",
+ class_rev);
+ printk(KERN_INFO
+ "\nPlease upgrade to Firmware Rev 46 or higher\n");
+ return 0;
+ }
+
+ printk(KERN_INFO "%s: IDE controller at PCI slot %s\n", d->name,
+ dev->slot_name);
+
+ if (pci_init_sgiioc4(dev, d))
+ return 0;
+
+ MOD_INC_USE_COUNT;
+
+ return 0;
+}
+
+static struct pci_device_id sgiioc4_pci_tbl[] = {
+ {PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC4, PCI_ANY_ID,
+ PCI_ANY_ID, 0x0b4000, 0xFFFFFF, 0},
+ {0}
+};
+
+static struct pci_driver driver = {
+ .name = "SGI-IOC4 IDE",
+ .id_table = sgiioc4_pci_tbl,
+ .probe = sgiioc4_init_one,
+};
+
+static int
+sgiioc4_ide_init(void)
+{
+ return ide_pci_register_driver(&driver);
+}
+
+static void
+sgiioc4_ide_exit(void)
+{
+ ide_pci_unregister_driver(&driver);
+}
+
+module_init(sgiioc4_ide_init);
+module_exit(sgiioc4_ide_exit);
+
+MODULE_AUTHOR("Aniket Malatpure - Silicon Graphics Inc. (SGI)");
+MODULE_DESCRIPTION("PCI driver module for SGI IOC4 Base-IO Card");
+MODULE_LICENSE("GPL");
diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
--- a/include/linux/pci_ids.h Fri Oct 3 18:47:33 2003
+++ b/include/linux/pci_ids.h Fri Oct 3 18:47:33 2003
@@ -896,6 +896,7 @@

#define PCI_VENDOR_ID_SGI 0x10a9
#define PCI_DEVICE_ID_SGI_IOC3 0x0003
+#define PCI_DEVICE_ID_SGI_IOC4 0x100a
#define PCI_VENDOR_ID_SGI_LITHIUM 0x1002

#define PCI_VENDOR_ID_ACC 0x10aa