That is a legacy bit from ATA-2 but it is one of those things you can not
get rid of :-( even thou things are obsoleted, they are not retired.
This means that you have to go back into the past to see how it was used,
silly! I hope you agree to that point.
This is the drive->ctrl register pointer.
outp(drive->ctl|0x02, IDE_CONTROL_REG);
typedef union {
unsigned all : 8; /* all of the bits together */
struct {
unsigned bit0 : 1;
unsigned nIEN : 1; /* device INTRQ to host */
unsigned SRST : 1; /* host soft reset bit */
unsigned bit3 : 1; /* ATA-2 thingy */
unsigned reserved456 : 3;
unsigned HOB : 1; /* 48-bit address ordering */
} b;
} control_t;
This is a new struct that is to be added for 48-bit addressing and it will
reflect drive->ctl soon. I have not decided how to use it best or at all,
but it has meaning and once I add-in the real def of bit3 then I will not
need to look it up again.
Cheers,
Andre Hedrick
ASL Kernel Development
Linux ATA Development
-----------------------------------------------------------------------------
ASL, Inc. Toll free: 1-877-ASL-3535
1757 Houret Court Fax: 1-408-941-2071
Milpitas, CA 95035 Web: www.aslab.com
On Thu, 28 Jun 2001, Gunther Mayer wrote:
> Andre Hedrick wrote:
> >
> > It fixes a BUG in CFA, but what will it do to the other stuff?
> > Parse it exclusive to CFA and there is not an issue.
> ...
> > Not all ./arch have a control register doing this randomly without know the
> > rest of the driver will kill more than it fixes.
> >
>
> Thanks for pointing out this implementation bug. Although I fixed another problem
> in ide-cs, where ctl_base could eventually be 0.
>
> I would rather not add a special hwif->is_pcmcia flag, as
> the control register (if it exists) is well defined
> (bit2=softreset bit1=nIEN, others reserved; however there is
> a hardcoded value of 0x08 somewhere in the ide code?).
>
> -
> Gunther
>
>
>
> --- linux245.orig/drivers/ide/ide-cs.c Fri Feb 9 20:40:02 2001
> +++ linux/drivers/ide/ide-cs.c Thu Jun 28 18:04:27 2001
> @@ -42,6 +42,7 @@
> #include <linux/ioport.h>
> #include <linux/hdreg.h>
> #include <linux/major.h>
> +#include <linux/ide.h>
>
> #include <asm/io.h>
> #include <asm/system.h>
> @@ -223,6 +224,15 @@
> #define CFG_CHECK(fn, args...) \
> if (CardServices(fn, args) != 0) goto next_entry
>
> +int idecs_register (int arg1, int arg2, int irq)
> +{
> + hw_regs_t hw;
> + ide_init_hwif_ports(&hw, (ide_ioreg_t) arg1, (ide_ioreg_t) arg2, NULL);
> + hw.irq = irq;
> + hw.chipset = ide_pci; // this enables IRQ sharing w/ PCI irqs
> + return ide_register_hw(&hw, NULL);
> +}
> +
> void ide_config(dev_link_t *link)
> {
> client_handle_t handle = link->handle;
> @@ -326,10 +336,12 @@
>
> /* retry registration in case device is still spinning up */
> for (i = 0; i < 10; i++) {
> - hd = ide_register(io_base, ctl_base, link->irq.AssignedIRQ);
> + if(ctl_base) outb(0x02, ctl_base); // Set nIEN = disable device interrupts
> + hd = idecs_register(io_base, ctl_base, link->irq.AssignedIRQ);
> if (hd >= 0) break;
> if (link->io.NumPorts1 == 0x20) {
> - hd = ide_register(io_base+0x10, ctl_base+0x10,
> + if(ctl_base) outb(0x02, ctl_base+0x10);
> + hd = idecs_register(io_base+0x10, ctl_base+0x10,
> link->irq.AssignedIRQ);
> if (hd >= 0) {
> io_base += 0x10; ctl_base += 0x10;
> --- linux245.orig/drivers/ide/ide-probe.c Sun Mar 18 18:25:02 2001
> +++ linux/drivers/ide/ide-probe.c Thu Jun 28 18:43:43 2001
> @@ -685,6 +685,9 @@
> #else /* !CONFIG_IDEPCI_SHARE_IRQ */
> int sa = (hwif->chipset == ide_pci) ? SA_INTERRUPT|SA_SHIRQ :
>SA_INTERRUPT;
> #endif /* CONFIG_IDEPCI_SHARE_IRQ */
> +
> + if(hwif->io_ports[IDE_CONTROL_OFFSET])
> + OUT_BYTE(0x00, hwif->io_ports[IDE_CONTROL_OFFSET]); // clear
>nIEN == enable irqs
> if (ide_request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwgroup)) {
> if (!match)
> kfree(hwgroup);
> --- linux245.orig/drivers/ide/ide.c Wed May 2 01:05:00 2001
> +++ linux/drivers/ide/ide.c Thu Jun 28 18:04:42 2001
> @@ -2181,6 +2181,7 @@
> memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
> hwif->irq = hw->irq;
> hwif->noprobe = 0;
> + hwif->chipset = hw->chipset;
>
> if (!initializing) {
> ide_probe_module();
> --- linux245.orig/include/linux/ide.h Sat May 26 03:02:42 2001
> +++ linux/include/linux/ide.h Thu Jun 28 18:18:05 2001
> @@ -226,6 +226,19 @@
> #endif
>
> /*
> + * hwif_chipset_t is used to keep track of the specific hardware
> + * chipset used by each IDE interface, if known.
> + */
> +typedef enum { ide_unknown, ide_generic, ide_pci,
> + ide_cmd640, ide_dtc2278, ide_ali14xx,
> + ide_qd6580, ide_umc8672, ide_ht6560b,
> + ide_pdc4030, ide_rz1000, ide_trm290,
> + ide_cmd646, ide_cy82c693, ide_4drives,
> + ide_pmac
> +} hwif_chipset_t;
> +
> +
> +/*
> * Structure to hold all information about the location of this port
> */
> typedef struct hw_regs_s {
> @@ -234,6 +247,7 @@
> int dma; /* our dma entry */
> ide_ack_intr_t *ack_intr; /* acknowledge interrupt */
> void *priv; /* interface specific data */
> + hwif_chipset_t chipset;
> } hw_regs_t;
>
> /*
> @@ -396,17 +410,6 @@
> typedef void (ide_maskproc_t) (ide_drive_t *, int);
> typedef void (ide_rw_proc_t) (ide_drive_t *, ide_dma_action_t);
>
> -/*
> - * hwif_chipset_t is used to keep track of the specific hardware
> - * chipset used by each IDE interface, if known.
> - */
> -typedef enum { ide_unknown, ide_generic, ide_pci,
> - ide_cmd640, ide_dtc2278, ide_ali14xx,
> - ide_qd6580, ide_umc8672, ide_ht6560b,
> - ide_pdc4030, ide_rz1000, ide_trm290,
> - ide_cmd646, ide_cy82c693, ide_4drives,
> - ide_pmac
> -} hwif_chipset_t;
>
> #ifdef CONFIG_BLK_DEV_IDEPCI
> typedef struct ide_pci_devid_s {
>
-
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