/* ohci.c - OHCI Support. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
struct grub_ohci_hcca
{
/* Pointers to Interrupt Endpoint Descriptors. Not used by
GRUB. */
grub_uint32_t inttable[32];
/* Current frame number. */
grub_uint16_t framenumber;
grub_uint16_t pad;
/* List of completed TDs. */
grub_uint32_t donehead;
grub_uint8_t reserved[116];
} __attribute__((packed));
/* OHCI Endpoint Descriptor. */
struct grub_ohci_ed
{
grub_uint32_t target;
grub_uint32_t td_tail;
grub_uint32_t td_head;
grub_uint32_t next_ed;
} __attribute__((packed));
struct grub_ohci_td
{
/* Information used to construct the TOKEN packet. */
grub_uint32_t token;
grub_uint32_t buffer;
grub_uint32_t next_td;
grub_uint32_t buffer_end;
} __attribute__((packed));
typedef struct grub_ohci_td *grub_ohci_td_t;
typedef struct grub_ohci_ed *grub_ohci_ed_t;
struct grub_ohci
{
volatile grub_uint32_t *iobase;
volatile struct grub_ohci_hcca *hcca;
struct grub_ohci *next;
};
static struct grub_ohci *ohci;
typedef enum
{
GRUB_OHCI_REG_REVISION = 0x00,
GRUB_OHCI_REG_CONTROL,
GRUB_OHCI_REG_CMDSTATUS,
GRUB_OHCI_REG_INTSTATUS,
GRUB_OHCI_REG_INTENA,
GRUB_OHCI_REG_INTDIS,
GRUB_OHCI_REG_HCCA,
GRUB_OHCI_REG_PERIODIC,
GRUB_OHCI_REG_CONTROLHEAD,
GRUB_OHCI_REG_CONTROLCURR,
GRUB_OHCI_REG_BULKHEAD,
GRUB_OHCI_REG_BULKCURR,
GRUB_OHCI_REG_DONEHEAD,
GRUB_OHCI_REG_FRAME_INTERVAL,
GRUB_OHCI_REG_RHUBA = 18,
GRUB_OHCI_REG_RHUBPORT = 21
} grub_ohci_reg_t;
static grub_uint32_t
grub_ohci_readreg32 (struct grub_ohci *o, grub_ohci_reg_t reg)
{
return grub_le_to_cpu32 (*(o->iobase + reg));
}
static void
grub_ohci_writereg32 (struct grub_ohci *o,
grub_ohci_reg_t reg, grub_uint32_t val)
{
*(o->iobase + reg) = grub_cpu_to_le32 (val);
}
/* Iterate over all PCI devices. Determine if a device is an OHCI
controller. If this is the case, initialize it. */
static int NESTED_FUNC_ATTR
grub_ohci_pci_iter (int bus, int device, int func,
grub_pci_id_t pciid __attribute__((unused)))
{
grub_uint32_t class;
grub_uint32_t subclass;
int interf;
grub_uint32_t base;
grub_pci_address_t addr;
struct grub_ohci *o;
grub_uint32_t revision;
grub_uint32_t frame_interval;
addr = grub_pci_make_address (bus, device, func, 2);
class = grub_pci_read (addr);
addr = grub_pci_make_address (bus, device, func, 2);
class = grub_pci_read (addr);
interf = class & 0xFF;
subclass = (class >> 16) & 0xFF;
class >>= 24;
/* If this is not an OHCI controller, just return. */
if (class != 0x0c || subclass != 0x03)
return 0;
/* Determine IO base address. */
addr = grub_pci_make_address (bus, device, func, 4);
base = grub_pci_read (addr);
#if 0
/* Stop if there is no IO space base address defined. */
if (! (base & 1))
return 0;
#endif
/* Allocate memory for the controller and register it. */
o = grub_malloc (sizeof (*o));
if (! o)
return 1;
/* Link in the OHCI. */
o->next = ohci;
ohci = o;
o->iobase = (grub_uint32_t *) base;
/* Reserve memory for the HCCA. */
o->hcca = (struct grub_ohci_hcca *) grub_memalign (256, 256);
/* Check if the OHCI revision is actually 1.0 as supported. */
revision = grub_ohci_readreg32 (o, GRUB_OHCI_REG_REVISION);
grub_dprintf ("ohci", "OHCI revision=0x%02x\n", revision & 0xFF);
if ((revision & 0xFF) != 0x10)
goto fail;
/* Backup the frame interval register. */
frame_interval = grub_ohci_readreg32 (o, GRUB_OHCI_REG_FRAME_INTERVAL);
/* Suspend the OHCI by issuing a reset. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, 1); /* XXX: Magic.
*/
grub_millisleep (1);
grub_dprintf ("ohci", "OHCI reset\n");
/* Restore the frame interval register. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_FRAME_INTERVAL, frame_interval);
/* Setup the HCCA. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, (grub_uint32_t) o->hcca);
grub_dprintf ("ohci", "OHCI HCCA\n");
/* Enable the OHCI. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL,
(2 << 6));
grub_dprintf ("ohci", "OHCI enable: 0x%02x\n",
(grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL) >> 6) & 3);
return 0;
fail:
if (o)
grub_free ((void *) o->hcca);
grub_free (o);
return 1;
}
static void
grub_ohci_inithw (void)
{
grub_pci_iterate (grub_ohci_pci_iter);
}
static int
grub_ohci_iterate (int (*hook) (grub_usb_controller_t dev))
{
struct grub_ohci *o;
struct grub_usb_controller dev;
for (o = ohci; o; o = o->next)
{
dev.data = o;
if (hook (&dev))
return 1;
}
return 0;
}
static void
grub_ohci_transaction (grub_ohci_td_t td,
grub_transfer_type_t type, unsigned int toggle,
grub_size_t size, char *data)
{
grub_uint32_t token;
grub_uint32_t buffer;
grub_uint32_t buffer_end;
grub_dprintf ("ohci", "OHCI transaction td=%p type=%d, toggle=%d, size=%d\n",
td, type, toggle, size);
switch (type)
{
case GRUB_USB_TRANSFER_TYPE_SETUP:
token = 0 << 19;
break;
case GRUB_USB_TRANSFER_TYPE_IN:
token = 2 << 19;
break;
case GRUB_USB_TRANSFER_TYPE_OUT:
token = 1 << 19;
break;
default:
token = 0;
break;
}
/* Generate no interrupts. */
token |= 7 << 21;
/* Set the token. */
token |= toggle << 24;
token |= 1 << 25;
buffer = (grub_uint32_t) data;
buffer_end = buffer + size - 1;
td->token = grub_cpu_to_le32 (token);
td->buffer = grub_cpu_to_le32 (buffer);
td->next_td = 0;
td->buffer_end = grub_cpu_to_le32 (buffer_end);
}
static grub_usb_err_t
grub_ohci_transfer (grub_usb_controller_t dev,
grub_usb_transfer_t transfer)
{
struct grub_ohci *o = (struct grub_ohci *) dev->data;
grub_ohci_ed_t ed;
grub_ohci_td_t td_list;
grub_uint32_t target;
grub_uint32_t td_tail;
grub_uint32_t td_head;
grub_uint32_t status;
grub_uint32_t control;
grub_usb_err_t err;
int i;
/* Allocate an Endpoint Descriptor. */
ed = grub_memalign (16, sizeof (*ed));
if (! ed)
return GRUB_USB_ERR_INTERNAL;
td_list = grub_memalign (16, sizeof (*td_list) * (transfer->transcnt + 1));
if (! td_list)
{
grub_free ((void *) ed);
return GRUB_USB_ERR_INTERNAL;
}
grub_dprintf ("ohci", "alloc=%p\n", td_list);
/* Setup all Transfer Descriptors. */
for (i = 0; i < transfer->transcnt; i++)
{
grub_usb_transaction_t tr = &transfer->transactions[i];
grub_ohci_transaction (&td_list[i], tr->pid, tr->toggle,
tr->size, tr->data);
td_list[i].next_td = grub_cpu_to_le32 (&td_list[i + 1]);
}
/* Setup the Endpoint Descriptor. */
/* Set the device address. */
target = transfer->devaddr;
/* Set the endpoint. */
target |= transfer->endpoint << 7;
/* Set the device speed. */
target |= (transfer->dev->speed == GRUB_USB_SPEED_LOW) << 13;
/* Set the maximum packet size. */
target |= transfer->max << 16;
td_head = (grub_uint32_t) td_list;
td_tail = (grub_uint32_t) &td_list[transfer->transcnt];
ed->target = grub_cpu_to_le32 (target);
ed->td_head = grub_cpu_to_le32 (td_head);
ed->td_tail = grub_cpu_to_le32 (td_tail);
ed->next_ed = grub_cpu_to_le32 (0);
grub_dprintf ("ohci", "program OHCI\n");
/* Program the OHCI to actually transfer. */
switch (transfer->type)
{
case GRUB_USB_TRANSACTION_TYPE_BULK:
{
grub_dprintf ("ohci", "add to bulk list\n");
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS);
control = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL);
/* Disable the Control and Bulk lists. */
control &= ~(3 << 4);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Clear BulkListFilled. */
status &= ~(1 << 2);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, (grub_uint32_t) ed);
/* Enable the Bulk list. */
control |= 1 << 5;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Set BulkListFilled. */
status |= 1 << 2;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
break;
}
case GRUB_USB_TRANSACTION_TYPE_CONTROL:
{
grub_dprintf ("ohci", "add to control list\n");
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS);
control = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL);
/* Disable the Control and Bulk lists. */
control &= ~(3 << 4);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Clear ControlListFilled. */
status &= ~(1 << 1);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD,
(grub_uint32_t) ed);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD+1,
(grub_uint32_t) ed);
/* Enable the Control list. */
control |= 1 << 4;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Set ControlListFilled. */
status |= 1 << 1;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
break;
}
}
grub_dprintf ("ohci", "wait for completion\n");
grub_dprintf ("ohci", "control=0x%02x status=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL),
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS));
/* Wait until the transfer is completed or STALLs. */
while ((ed->td_head & ~0xf) != (ed->td_tail & ~0xf))
{
grub_cpu_idle ();
grub_dprintf ("ohci", "head=0x%02x tail=0x%02x\n", ed->td_head, ed->td_tail);
/* Detected a STALL. */
if (ed->td_head & 1)
break;
}
grub_dprintf ("ohci", "complete\n");
/* if (ed->td_head & 1) */
/* err = GRUB_USB_ERR_STALL; */
/* else if (ed->td */
if (ed->td_head & 1)
{
grub_uint8_t errcode;
grub_ohci_td_t tderr;
tderr = (grub_ohci_td_t) grub_ohci_readreg32 (o,
GRUB_OHCI_REG_DONEHEAD);
errcode = tderr->token >> 28;
switch (errcode)
{
case 0:
/* XXX: Should not happen! */
grub_error (GRUB_ERR_IO, "OHCI without reporting the reason");
err = GRUB_USB_ERR_INTERNAL;
break;
case 1:
/* XXX: CRC error. */
err = GRUB_USB_ERR_TIMEOUT;
break;
case 2:
err = GRUB_USB_ERR_BITSTUFF;
break;
case 3:
/* XXX: Data Toggle error. */
err = GRUB_USB_ERR_DATA;
break;
case 4:
err = GRUB_USB_ERR_STALL;
break;
case 5:
/* XXX: Not responding. */
err = GRUB_USB_ERR_TIMEOUT;
break;
case 6:
/* XXX: PID Check bits failed. */
err = GRUB_USB_ERR_BABBLE;
break;
case 7:
/* XXX: PID unexpected failed. */
err = GRUB_USB_ERR_BABBLE;
break;
case 8:
/* XXX: Data overrun error. */
err = GRUB_USB_ERR_DATA;
break;
case 9:
/* XXX: Data underrun error. */
err = GRUB_USB_ERR_DATA;
break;
case 10:
/* XXX: Reserved. */
err = GRUB_USB_ERR_NAK;
break;
case 11:
/* XXX: Reserved. */
err = GRUB_USB_ERR_NAK;
break;
case 12:
/* XXX: Buffer overrun. */
err = GRUB_USB_ERR_DATA;
break;
case 13:
/* XXX: Buffer underrun. */
err = GRUB_USB_ERR_DATA;
break;
default:
err = GRUB_USB_ERR_NAK;
break;
}
}
else
err = GRUB_USB_ERR_NONE;
/* Disable the Control and Bulk lists. */
control = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL);
control &= ~(3 << 4);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Clear BulkListFilled and ControlListFilled. */
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS);
status &= ~((1 << 2) | (1 << 3));
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
/* XXX */
grub_free (td_list);
grub_free (ed);
return err;
}
static grub_err_t
grub_ohci_portstatus (grub_usb_controller_t dev,
unsigned int port, unsigned int enable)
{
struct grub_ohci *o = (struct grub_ohci *) dev->data;
grub_uint32_t status;
/* Reset the port. */
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port);
status |= (1 << 4); /* XXX: Magic. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port, status);
grub_millisleep (100);
/* End the reset signaling. */
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port);
status |= (1 << 20); /* XXX: Magic. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port, status);
grub_millisleep (10);
/* Enable the port. */
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port);
status |= (enable << 1); /* XXX: Magic. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port, status);
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port);
grub_dprintf ("ohci", "portstatus=0x%02x\n", status);
return GRUB_ERR_NONE;
}
static grub_usb_speed_t
grub_ohci_detect_dev (grub_usb_controller_t dev, int port)
{
struct grub_ohci *o = (struct grub_ohci *) dev->data;
grub_uint32_t status;
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port);
grub_dprintf ("ohci", "detect_dev status=0x%02x\n", status);
if (! (status & 1))
return GRUB_USB_SPEED_NONE;
else if (status & (1 << 9))
return GRUB_USB_SPEED_LOW;
else
return GRUB_USB_SPEED_FULL;
}
static int
grub_ohci_hubports (grub_usb_controller_t dev)
{
struct grub_ohci *o = (struct grub_ohci *) dev->data;
grub_uint32_t portinfo;
portinfo = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBA);
grub_dprintf ("ohci", "root hub ports=%d\n", portinfo & 0xFF);
/* The root hub has exactly two ports. */
return portinfo & 0xFF;
}
static struct grub_usb_controller_dev usb_controller =
{
.name = "ohci",
.iterate = grub_ohci_iterate,
.transfer = grub_ohci_transfer,
.hubports = grub_ohci_hubports,
.portstatus = grub_ohci_portstatus,
.detect_dev = grub_ohci_detect_dev
};
GRUB_MOD_INIT(ohci)
{
grub_ohci_inithw ();
grub_usb_controller_dev_register (&usb_controller);
}
GRUB_MOD_FINI(ohci)
{
grub_usb_controller_dev_unregister (&usb_controller);
}