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

From: Jeremy Higdon
Date: Fri Oct 24 2003 - 21:14:53 EST

Bartlomiej and Andrew,

Here is the new IOC4 patch relative to Linus's BK tree.

Bartlomiej, can you review and give your comment? I took out the ack_intr
code, since it seems to be redundant, because the IOC4 is a PCI device
and the interrupt is cleared in sgiioc4_INB().

thanks

jeremy


drivers/ide/Kconfig | 8
drivers/ide/arm/icside.c | 4
drivers/ide/ide-dma.c | 12
drivers/ide/pci/Makefile | 1
drivers/ide/pci/sgiioc4.c | 833 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/ide.h | 2
include/linux/pci_ids.h | 1
7 files changed, 855 insertions(+), 6 deletions(-)


diff -Nru a/drivers/ide/Kconfig b/drivers/ide/Kconfig
--- a/drivers/ide/Kconfig Fri Oct 24 18:58:44 2003
+++ b/drivers/ide/Kconfig Fri Oct 24 18:58:44 2003
@@ -740,6 +740,14 @@
This driver adds PIO/(U)DMA support for the ServerWorks OSB4/CSB5
chipsets.

+config BLK_DEV_SGIIOC4
+ tristate "Silicon Graphics IOC4 chipset support"
+ depends on IA64_SGI_SN2
+ help
+ This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
+ chipset, which has one channel and can support two devices.
+ Please say Y here if you have an Altix System from SGI.
+
config BLK_DEV_SIIMAGE
tristate "Silicon Image chipset support"
help
diff -Nru a/drivers/ide/arm/icside.c b/drivers/ide/arm/icside.c
--- a/drivers/ide/arm/icside.c Fri Oct 24 18:58:44 2003
+++ b/drivers/ide/arm/icside.c Fri Oct 24 18:58:44 2003
@@ -214,7 +214,7 @@
#define NR_ENTRIES 256
#define TABLE_SIZE (NR_ENTRIES * 8)

-static void ide_build_sglist(ide_drive_t *drive, struct request *rq)
+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;
@@ -543,7 +543,7 @@
BUG_ON(hwif->sg_dma_active);
BUG_ON(dma_channel_active(hwif->hw.dma));

- ide_build_sglist(drive, rq);
+ icside_build_sglist(drive, rq);

/*
* Ensure that we have the right interrupt routed.
diff -Nru a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
--- a/drivers/ide/ide-dma.c Fri Oct 24 18:58:44 2003
+++ b/drivers/ide/ide-dma.c Fri Oct 24 18:58:44 2003
@@ -200,8 +200,8 @@
* kernel provide the necessary cache management so that we can
* operate in a portable fashion
*/
-
-static int ide_build_sglist (ide_drive_t *drive, struct request *rq)
+
+int ide_build_sglist(ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = HWIF(drive);
struct scatterlist *sg = hwif->sg_table;
@@ -220,6 +220,8 @@
return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
}

+EXPORT_SYMBOL_GPL(ide_build_sglist);
+
/**
* ide_raw_build_sglist - map IDE scatter gather for DMA
* @drive: the drive to build the DMA table for
@@ -230,8 +232,8 @@
* of the kernel provide the necessary cache management so that we can
* operate in a portable fashion
*/
-
-static int ide_raw_build_sglist (ide_drive_t *drive, struct request *rq)
+
+int ide_raw_build_sglist(ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = HWIF(drive);
struct scatterlist *sg = hwif->sg_table;
@@ -269,6 +271,8 @@

return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
}
+
+EXPORT_SYMBOL_GPL(ide_raw_build_sglist);

/**
* ide_build_dmatable - build IDE DMA table
diff -Nru a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
--- a/drivers/ide/pci/Makefile Fri Oct 24 18:58:44 2003
+++ b/drivers/ide/pci/Makefile Fri Oct 24 18:58:44 2003
@@ -21,6 +21,7 @@
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 24 18:58:44 2003
@@ -0,0 +1,833 @@
+/*
+ * 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>
+
+#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
+
+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 = 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_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 int
+sgiioc4_checkirq(ide_hwif_t * hwif)
+{
+ u8 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 */
+ /*
+ * Using hwif->INB to read the IDE_STATUS_REG 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 = hwif->INB(IDE_STATUS_REG);
+ int count = 0;
+ stat = hwif->INB(IDE_STATUS_REG);
+ while ((stat & 0x80) && (count++ < 100)) {
+ udelay(1);
+ stat = hwif->INB(IDE_STATUS_REG);
+ }
+
+ if (intr_reg & 0x02) {
+ /* 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 =
+ 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 & 3;
+}
+
+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;
+}
+
+static u32
+sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
+{
+ u32 ioc4_dma;
+ int count;
+
+ count = 0;
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
+ udelay(1);
+ ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+ }
+ return ioc4_dma;
+}
+
+/* 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);
+ u64 dma_base = hwif->dma_base;
+ int dma_stat = 0;
+ unsigned long *ending_dma = (unsigned long *) hwif->dma_base2;
+
+ hwif->OUTL(IOC4_S_DMA_STOP, 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",
+ __FUNCTION__, 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", __FUNCTION__,
+ drive->name);
+ dma_stat = 1;
+ }
+
+ 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_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 void
+sgiioc4_resetproc(ide_drive_t * drive)
+{
+ sgiioc4_ide_dma_end(drive);
+ sgiioc4_clearirq(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) -- ERROR, Addresses 0x%p to 0x%p "
+ "ALREADY in use\n",
+ __FUNCTION__, hwif->name, (void *) dma_base,
+ (void *) dma_base + num_ports - 1);
+ goto dma_alloc_failure;
+ }
+
+ 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)
+ goto dma_sgalloc_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)
+ goto dma_base2alloc_failure;
+
+ return;
+
+dma_base2alloc_failure:
+ kfree(hwif->sg_table);
+
+dma_sgalloc_failure:
+ pci_free_consistent(hwif->pci_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",
+ __FUNCTION__, hwif->name);
+ printk(KERN_INFO
+ "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
+
+dma_alloc_failure:
+ /* 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;
+ ide_hwif_t *hwif = HWIF(drive);
+ u64 dma_base = hwif->dma_base;
+ u32 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);
+ 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",
+ __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);
+ 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",
+ __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 = ide_raw_build_sglist(drive, rq);
+ else
+ 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 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_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 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 = &__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 = &__ide_dma_timeout;
+ hwif->INB = &sgiioc4_INB;
+}
+
+static int __init
+sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
+{
+ unsigned long base, ctl, dma_base, irqport;
+ ide_hwif_t *hwif;
+ int h;
+
+ for (h = 0; h < MAX_HWIFS; ++h) {
+ hwif = &ide_hwifs[h];
+ /* Find an empty HWIF */
+ if (hwif->chipset == ide_unknown)
+ break;
+ }
+
+ /* 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 -- ERROR, Port Addresses "
+ "0x%p to 0x%p ALREADY in use\n",
+ __FUNCTION__, hwif->name, (void *) base,
+ (void *) base + IOC4_CMD_CTL_BLK_SIZE);
+ return 1;
+ }
+
+ 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->gendev.parent = &dev->dev;/* setup proper ancestral information */
+
+ /* Initializing chipset IRQ Registers */
+ hwif->OUTL(0x03, irqport + IOC4_INTR_SET * 4);
+
+ 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);
+ return 0;
+}
+
+/* This ensures that we can build this for generic kernels without
+ * having all the SN2 code sync'd and merged.
+ */
+typedef enum pciio_endian_e {
+ PCIDMA_ENDIAN_BIG,
+ PCIDMA_ENDIAN_LITTLE
+} pciio_endian_t;
+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)
+{
+ unsigned int class_rev;
+
+ if (pci_enable_device(dev)) {
+ printk(KERN_ERR
+ "Failed to enable device %s at slot %s\n",
+ d->name, dev->slot_name);
+ return 1;
+ }
+ pci_set_master(dev);
+
+ pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+ class_rev &= 0xff;
+ printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
+ d->name, dev->slot_name, class_rev);
+ if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
+ printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
+ "firmware is obsolete - please upgrade to revision"
+ "46 or higher\n", d->name, dev->slot_name);
+ return 1;
+ }
+
+ /* 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_ERR
+ "Failed to set endianness for device %s at slot %s\n",
+ d->name, dev->slot_name);
+ return 1;
+ }
+
+ return sgiioc4_ide_setup_pci_device(dev, 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_hwif = ide_init_sgiioc4,
+ .init_dma = ide_dma_sgiioc4,
+ .channels = 1,
+ .autodma = AUTODMA,
+ /* SGI IOC4 doesn't have enablebits. */
+ .bootable = ON_BOARD,
+ }
+};
+
+static int __devinit
+sgiioc4_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ 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();
+ }
+
+ 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/ide.h b/include/linux/ide.h
--- a/include/linux/ide.h Fri Oct 24 18:58:44 2003
+++ b/include/linux/ide.h Fri Oct 24 18:58:44 2003
@@ -1693,6 +1693,8 @@
#define GOOD_DMA_DRIVE 1

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
+extern int ide_build_sglist(ide_drive_t *, struct request *);
+extern int ide_raw_build_sglist(ide_drive_t *, struct request *);
extern int ide_build_dmatable(ide_drive_t *, struct request *);
extern void ide_destroy_dmatable(ide_drive_t *);
extern ide_startstop_t ide_dma_intr(ide_drive_t *);
diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
--- a/include/linux/pci_ids.h Fri Oct 24 18:58:44 2003
+++ b/include/linux/pci_ids.h Fri Oct 24 18:58:44 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
-
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