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piix_ide_reset: Use pci_set_* functions instead of direct access 

Eliminate the remaining TODOs in hw/ide/piix.c by:
* Using pci_set_{size} functions to write the PIIX PCI configuration
  space instead of manipulating it directly as an array; and
* Documenting the default register values by reference to the
  controlling specification.

Signed-off-by: Lev Kujawski <lkujaw@member.fsf.org>
Message-Id: <20220707031140.158958-1-lkujaw@member.fsf.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Lev Kujawski 2022-07-07 03:11:34 +00:00 committed by Kevin Wolf
parent 25474d90aa
commit 4851a986b2
1 changed files with 9 additions and 8 deletions
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17
hw/ide/piix.c
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@ -21,6 +21,10 @@
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* References:
* [1] 82371FB (PIIX) AND 82371SB (PIIX3) PCI ISA IDE XCELERATOR,
* 290550-002, Intel Corporation, April 1997.
*/
#include "qemu/osdep.h"
@ -114,14 +118,11 @@ static void piix_ide_reset(DeviceState *dev)
ide_bus_reset(&d->bus[i]);
}
/* TODO: this is the default. do not override. */
pci_conf[PCI_COMMAND] = 0x00;
/* TODO: this is the default. do not override. */
pci_conf[PCI_COMMAND + 1] = 0x00;
/* TODO: use pci_set_word */
pci_conf[PCI_STATUS] = PCI_STATUS_FAST_BACK;
pci_conf[PCI_STATUS + 1] = PCI_STATUS_DEVSEL_MEDIUM >> 8;
pci_conf[0x20] = 0x01; /* BMIBA: 20-23h */
/* PCI command register default value (0000h) per [1, p.48]. */
pci_set_word(pci_conf + PCI_COMMAND, 0x0000);
pci_set_word(pci_conf + PCI_STATUS,
PCI_STATUS_DEVSEL_MEDIUM | PCI_STATUS_FAST_BACK);
pci_set_byte(pci_conf + 0x20, 0x01); /* BMIBA: 20-23h */
}
static int pci_piix_init_ports(PCIIDEState *d)