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grub/grub-core/bus/usb/ohci.c
BVK Chaitanya 297f0c2b6e merge with mainline
2010-07-13 00:43:28 +05:30

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/* 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 <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/usb.h>
#include <grub/usbtrans.h>
#include <grub/misc.h>
#include <grub/pci.h>
#include <grub/cpu/pci.h>
#include <grub/cpu/io.h>
#include <grub/time.h>
#include <grub/cs5536.h>
#include <grub/loader.h>
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 volatile struct grub_ohci_td *grub_ohci_td_t;
typedef volatile struct grub_ohci_ed *grub_ohci_ed_t;
struct grub_ohci
{
volatile grub_uint32_t *iobase;
volatile struct grub_ohci_hcca *hcca;
grub_uint32_t hcca_addr;
struct grub_pci_dma_chunk *hcca_chunk;
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_PERIODIC_START = 16,
GRUB_OHCI_REG_RHUBA = 18,
GRUB_OHCI_REG_RHUBPORT = 21,
GRUB_OHCI_REG_LEGACY_CONTROL = 0x100,
GRUB_OHCI_REG_LEGACY_INPUT = 0x104,
GRUB_OHCI_REG_LEGACY_OUTPUT = 0x108,
GRUB_OHCI_REG_LEGACY_STATUS = 0x10c
} grub_ohci_reg_t;
#define GRUB_OHCI_RHUB_PORT_POWER_MASK 0x300
#define GRUB_OHCI_RHUB_PORT_ALL_POWERED 0x200
#define GRUB_OHCI_REG_FRAME_INTERVAL_FSMPS_MASK 0x8fff0000
#define GRUB_OHCI_REG_FRAME_INTERVAL_FSMPS_SHIFT 16
#define GRUB_OHCI_REG_FRAME_INTERVAL_FI_SHIFT 0
/* XXX: Is this choice of timings sane? */
#define GRUB_OHCI_FSMPS 0x2778
#define GRUB_OHCI_PERIODIC_START 0x257f
#define GRUB_OHCI_FRAME_INTERVAL 0x2edf
#define GRUB_OHCI_SET_PORT_ENABLE (1 << 1)
#define GRUB_OHCI_CLEAR_PORT_ENABLE (1 << 0)
#define GRUB_OHCI_SET_PORT_RESET (1 << 4)
#define GRUB_OHCI_SET_PORT_RESET_STATUS_CHANGE (1 << 20)
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 (grub_pci_device_t dev,
grub_pci_id_t pciid)
{
grub_uint32_t interf;
grub_uint32_t base;
grub_pci_address_t addr;
struct grub_ohci *o;
grub_uint32_t revision;
int cs5536;
/* Determine IO base address. */
grub_dprintf ("ohci", "pciid = %x\n", pciid);
if (pciid == GRUB_CS5536_PCIID)
{
grub_uint64_t basereg;
cs5536 = 1;
basereg = grub_cs5536_read_msr (dev, GRUB_CS5536_MSR_USB_OHCI_BASE);
if (!(basereg & GRUB_CS5536_MSR_USB_BASE_MEMORY_ENABLE))
{
/* Shouldn't happen. */
grub_dprintf ("ohci", "No OHCI address is assigned\n");
return 0;
}
base = (basereg & GRUB_CS5536_MSR_USB_BASE_ADDR_MASK);
basereg |= GRUB_CS5536_MSR_USB_BASE_BUS_MASTER;
basereg &= ~GRUB_CS5536_MSR_USB_BASE_PME_ENABLED;
basereg &= ~GRUB_CS5536_MSR_USB_BASE_PME_STATUS;
grub_cs5536_write_msr (dev, GRUB_CS5536_MSR_USB_OHCI_BASE, basereg);
}
else
{
grub_uint32_t class_code;
grub_uint32_t class;
grub_uint32_t subclass;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
class_code = grub_pci_read (addr) >> 8;
interf = class_code & 0xFF;
subclass = (class_code >> 8) & 0xFF;
class = class_code >> 16;
/* If this is not an OHCI controller, just return. */
if (class != 0x0c || subclass != 0x03 || interf != 0x10)
return 0;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0);
base = grub_pci_read (addr);
#if 0
/* Stop if there is no IO space base address defined. */
if (! (base & 1))
return 0;
#endif
grub_dprintf ("ohci", "class=0x%02x 0x%02x interface 0x%02x\n",
class, subclass, interf);
}
/* Allocate memory for the controller and register it. */
o = grub_malloc (sizeof (*o));
if (! o)
return 1;
o->iobase = grub_pci_device_map_range (dev, base, 0x800);
grub_dprintf ("ohci", "base=%p\n", o->iobase);
/* Reserve memory for the HCCA. */
o->hcca_chunk = grub_memalign_dma32 (256, 256);
if (! o->hcca_chunk)
return 1;
o->hcca = grub_dma_get_virt (o->hcca_chunk);
o->hcca_addr = grub_dma_get_phys (o->hcca_chunk);
/* 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;
{
grub_uint32_t control;
/* Check SMM/BIOS ownership of OHCI (SMM = USB Legacy Support driver for BIOS) */
control = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL);
if ((control & 0x100) != 0)
{
unsigned i;
grub_dprintf("ohci", "OHCI is owned by SMM\n");
/* Do change of ownership */
/* Ownership change request */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, (1<<3)); /* XXX: Magic. */
/* Waiting for SMM deactivation */
for (i=0; i < 10; i++)
{
if ((grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL) & 0x100) == 0)
{
grub_dprintf("ohci", "Ownership changed normally.\n");
break;
}
grub_millisleep (100);
}
if (i >= 10)
{
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL,
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL) & ~0x100);
grub_dprintf("ohci", "Ownership changing timeout, change forced !\n");
}
}
else if (((control & 0x100) == 0) &&
((control & 0xc0) != 0)) /* Not owned by SMM nor reset */
{
grub_dprintf("ohci", "OHCI is owned by BIOS\n");
/* Do change of ownership - not implemented yet... */
/* In fact we probably need to do nothing ...? */
}
else
{
grub_dprintf("ohci", "OHCI is not owned by SMM nor BIOS\n");
/* We can setup OHCI. */
}
}
/* 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");
grub_ohci_writereg32 (o, GRUB_OHCI_REG_FRAME_INTERVAL,
(GRUB_OHCI_FSMPS
<< GRUB_OHCI_REG_FRAME_INTERVAL_FSMPS_SHIFT)
| (GRUB_OHCI_FRAME_INTERVAL
<< GRUB_OHCI_REG_FRAME_INTERVAL_FI_SHIFT));
grub_ohci_writereg32 (o, GRUB_OHCI_REG_PERIODIC_START,
GRUB_OHCI_PERIODIC_START);
/* Setup the HCCA. */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, o->hcca_addr);
grub_dprintf ("ohci", "OHCI HCCA\n");
/* Misc. pre-sets. */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, 0x7f); /* Clears everything */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLCURR, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKCURR, 0);
/* Check OHCI Legacy Support */
if ((revision & 0x100) != 0)
{
grub_dprintf ("ohci", "Legacy Support registers detected\n");
grub_dprintf ("ohci", "Current state of legacy control reg.: 0x%04x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_LEGACY_CONTROL));
grub_ohci_writereg32 (o, GRUB_OHCI_REG_LEGACY_CONTROL,
(grub_ohci_readreg32 (o, GRUB_OHCI_REG_LEGACY_CONTROL)) & ~1);
grub_dprintf ("ohci", "OHCI Legacy Support disabled.\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);
/* Power on all ports */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBA,
(grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBA)
& ~GRUB_OHCI_RHUB_PORT_POWER_MASK)
| GRUB_OHCI_RHUB_PORT_ALL_POWERED);
/* Wait for stable power (100ms) and stable attachment (100ms) */
/* I.e. minimum wait time should be probably 200ms. */
/* We assume that device is attached when ohci is loaded. */
/* Some devices take long time to power-on or indicate attach. */
/* Here is some experimental value which should probably mostly work. */
/* Cameras with manual USB mode selection and maybe some other similar
* devices will not work in some cases - they are repowered during
* ownership change and then they are starting slowly and mostly they
* are wanting select proper mode again...
* The same situation can be on computers where BIOS not set-up OHCI
* to be at least powered USB bus (maybe it is Yeelong case...?)
* Possible workaround could be for example some prompt
* for user with confirmation of proper USB device connection.
* Another workaround - "rmmod usbms", "rmmod ohci", proper start
* and configuration of USB device and then "insmod ohci"
* and "insmod usbms". */
grub_millisleep (500);
/* Link to ohci now that initialisation is successful. */
o->next = ohci;
ohci = o;
return 0;
fail:
if (o)
grub_dma_free (o->hcca_chunk);
grub_free (o);
return 0;
}
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, grub_uint32_t 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;
}
#if 0 /* Always generate interrupt */
/* Generate no interrupts. */
token |= 7 << 21;
#endif
/* Set the token. */
token |= toggle << 24;
token |= 1 << 25;
/* Set "Not accessed" error code */
token |= 15 << 28;
buffer = data;
buffer_end = buffer + size - 1;
/* Set correct buffer values in TD if zero transfer occurs */
if (size)
{
buffer = (grub_uint32_t) data;
buffer_end = buffer + size - 1;
td->buffer = grub_cpu_to_le32 (buffer);
td->buffer_end = grub_cpu_to_le32 (buffer_end);
}
else
{
td->buffer = 0;
td->buffer_end = 0;
}
/* Set the rest of TD */
td->token = grub_cpu_to_le32 (token);
td->next_td = 0;
}
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_uint32_t ed_addr;
struct grub_pci_dma_chunk *ed_chunk, *td_list_chunk;
grub_ohci_td_t td_list;
grub_uint32_t td_list_addr;
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;
grub_uint64_t maxtime;
int err_timeout = 0;
int err_unrec = 0;
grub_uint32_t intstatus;
grub_uint32_t tderr_addr = 0;
/* Allocate an Endpoint Descriptor. */
ed_chunk = grub_memalign_dma32 (256, sizeof (*ed));
if (! ed_chunk)
return GRUB_USB_ERR_INTERNAL;
ed = grub_dma_get_virt (ed_chunk);
ed_addr = grub_dma_get_phys (ed_chunk);
td_list_chunk = grub_memalign_dma32 (256, sizeof (*td_list)
* (transfer->transcnt + 1));
if (! td_list_chunk)
{
grub_dma_free (ed_chunk);
return GRUB_USB_ERR_INTERNAL;
}
td_list = grub_dma_get_virt (td_list_chunk);
td_list_addr = grub_dma_get_phys (td_list_chunk);
grub_dprintf ("ohci", "alloc=%p/0x%x\n", td_list, td_list_addr);
/* 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_addr
+ (i + 1) * sizeof (td_list[0]));
}
#if 0 /* Better will be enable interrupt on all TDs. */
/* The last-1 TD token we should change to enable interrupt when TD finishes.
* As OHCI interrupts are disabled, it does only setting of WDH bit in
* HcInterruptStatus register - and that is what we want to safely detect
* normal end of all transactions. */
td_list[transfer->transcnt - 1].token &= ~(7 << 21);
#endif
td_list[transfer->transcnt].token = 0;
td_list[transfer->transcnt].buffer = 0;
td_list[transfer->transcnt].buffer_end = 0;
td_list[transfer->transcnt].next_td =
(grub_uint32_t) &td_list[transfer->transcnt];
/* Setup the Endpoint Descriptor. */
/* Set the device address. */
target = transfer->devaddr;
/* Set the endpoint. It should be masked, we need 4 bits only. */
target |= (transfer->endpoint & 15) << 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 = td_list_addr;
td_tail = td_list_addr + transfer->transcnt * sizeof (*td_list);
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");
/* 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 &= ~(3 << 1);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
/* Now we should wait for start of next frame. Because we are not using
* interrupt, we reset SF bit and wait when it goes to 1. */
/* SF bit reset. (SF bit indicates Start Of Frame (SOF) packet) */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, (1<<2));
/* Wait for new SOF */
while ((grub_ohci_readreg32 (o, GRUB_OHCI_REG_INTSTATUS) & 0x4) == 0);
/* Now it should be safe to change CONTROL and BULK lists. */
/* This we do for safety's sake - it should be done in previous call
* of grub_ohci_transfer and nobody should change it in meantime...
* It should be done before start of control or bulk OHCI list. */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, (1 << 1)); /* Clears WDH */
/* Program the OHCI to actually transfer. */
switch (transfer->type)
{
case GRUB_USB_TRANSACTION_TYPE_BULK:
{
grub_dprintf ("ohci", "add to bulk list\n");
/* Set BulkList Head and Current */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, ed_addr);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKCURR, 0);
#define GRUB_OHCI_REG_CONTROL_BULK_ENABLE (1 << 5)
#define GRUB_OHCI_REG_CONTROL_CONTROL_ENABLE (1 << 4)
/* Enable the Bulk list. */
control = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL);
control |= GRUB_OHCI_REG_CONTROL_BULK_ENABLE;
control &= ~GRUB_OHCI_REG_CONTROL_CONTROL_ENABLE;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, control);
/* Set BulkListFilled. */
status = grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS);
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");
/* Set ControlList Head and Current */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD, ed_addr);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLCURR, 0);
/* Enable the Control list. */
control |= GRUB_OHCI_REG_CONTROL_CONTROL_ENABLE;
control &= ~GRUB_OHCI_REG_CONTROL_BULK_ENABLE;
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", "begin: control=0x%02x status=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL),
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS));
grub_dprintf ("ohci","intstatus=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_INTSTATUS));
/* Safety measure to avoid a hang. */
maxtime = grub_get_time_ms () + 1000;
/* Wait until the transfer is completed or STALLs. */
do
{
/* Check transfer status */
intstatus = grub_ohci_readreg32 (o, GRUB_OHCI_REG_INTSTATUS);
if ((intstatus & 0x2) != 0)
{
grub_dprintf ("ohci", "Current HccaDoneHead=0x%08x\n",
o->hcca->donehead);
/* Remember last successful TD */
tderr_addr = grub_le_to_cpu32 (o->hcca->donehead) & ~0xf;
/* Reset DoneHead */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, (1 << 1));
/* if TD is last, finish */
if (tderr_addr == td_list_addr
+ sizeof (td_list[0]) * (transfer->transcnt - 1))
break;
continue;
}
if ((intstatus & 0x10) != 0)
{ /* Unrecoverable error - only reset can help...! */
err_unrec = 1;
break;
}
/* Detected a HALT. */
if (grub_le_to_cpu32 (ed->td_head) & 1)
break;
/* Timeout ? */
if (grub_get_time_ms () > maxtime)
{
/* Disable the Control and Bulk lists. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL,
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL) & ~(3 << 4));
err_timeout = 1;
break;
}
if ((ed->td_head & ~0xf) == (ed->td_tail & ~0xf))
break;
grub_cpu_idle ();
}
while (1);
grub_dprintf ("ohci", "end: control=0x%02x status=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CONTROL),
grub_ohci_readreg32 (o, GRUB_OHCI_REG_CMDSTATUS));
grub_dprintf ("ohci", "intstatus=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_INTSTATUS));
if (!tderr_addr)
{
/* It means that something wrong happened,
* it could be:
* - timeout and no TD processed
* - some or unrecoverable error and no TD processed
* - something unexpected... :-( */
/* Try look into DONEHEAD reg., but there should be also zero */
grub_dprintf("ohci", "HCCA DoneHead is zero, something is bad!\n");
tderr_addr = grub_ohci_readreg32 (o, GRUB_OHCI_REG_DONEHEAD) & ~0xf;
}
/* Remember last processed transaction (TD) - it is necessary for
* proper setting of toggle bit in next transaction. */
transfer->last_trans = ((tderr_addr - td_list_addr) / sizeof (*td_list));
grub_dprintf("ohci", "tderr_addr=0x%x, td_list_addr=0x%x,\n",
tderr_addr, td_list_addr);
if ((ed->td_head & ~0xf) == (ed->td_tail & ~0xf))
transfer->last_trans = transfer->transcnt - 1;
/* Check correct value in last_trans */
/* It could happen if timeout happens and no TD was retired */
if (transfer->last_trans >= transfer->transcnt || !tderr_addr)
{
grub_dprintf("ohci", "tderr==0 or out of TDs range!\n");
grub_dprintf("ohci", "last_trans=%d, transcnt=%d\n",
transfer->last_trans, transfer->transcnt);
/* We should set something valid... */
transfer->last_trans = -1; /* Probably no TD done */
tderr_addr = td_list_addr;
}
/* In case of timeout do not detect error from TD */
if (err_timeout)
{
err = GRUB_ERR_TIMEOUT;
grub_dprintf("ohci", "Timeout, target=%08x, head=%08x\n",
grub_le_to_cpu32(ed->target),
grub_le_to_cpu32(ed->td_head));
grub_dprintf("ohci", "tail=%08x, next=%08x\n",
grub_le_to_cpu32(ed->td_tail),
grub_le_to_cpu32(ed->next_ed));
}
/* In case of unrecoverable error do not detect error from TD */
else if (err_unrec)
{
err = GRUB_USB_ERR_UNRECOVERABLE;
grub_dprintf("ohci",
"Unrecoverable error, target=%08x, head=%08x\n",
grub_le_to_cpu32(ed->target),
grub_le_to_cpu32(ed->td_head));
grub_dprintf("ohci", "tail=%08x, next=%08x\n",
grub_le_to_cpu32(ed->td_tail),
grub_le_to_cpu32(ed->next_ed));
}
else if (grub_le_to_cpu32 (ed->td_head) & 1)
{
grub_uint8_t errcode;
grub_ohci_td_t tderr = NULL;
transfer->last_trans--;
tderr = (grub_ohci_td_t) ((char *) td_list
+ (tderr_addr - td_list_addr));
errcode = grub_le_to_cpu32 (tderr->token) >> 28;
grub_dprintf ("ohci", "OHCI errcode=0x%02x\n", errcode);
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;
grub_dprintf ("ohci", "Overrun, failed TD address: %p, index: %d\n",
tderr, transfer->last_trans);
break;
case 9:
/* XXX: Data underrun error. */
err = GRUB_USB_ERR_DATA;
grub_dprintf ("ohci", "Underrun, failed TD address: %p, index: %d\n",
tderr, transfer->last_trans);
grub_dprintf ("ohci", "Underrun, number of not transferred bytes: %d\n",
1 + grub_le_to_cpu32 (tderr->buffer_end) - grub_le_to_cpu32 (tderr->buffer));
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 &= ~(3 << 1);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, status);
/* Set ED to be skipped - for safety */
ed->target |= grub_cpu_to_le32 (1 << 14);
/* Now we should wait for start of next frame.
* It is necessary because we will invalidate pointer to ED and it
* can be on OHCI active till SOF!
* Because we are not using interrupt, we reset SF bit and wait when
* it goes to 1. */
/* SF bit reset. (SF bit indicates Start Of Frame (SOF) packet) */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, (1<<2));
/* Wait for new SOF */
while (((grub_ohci_readreg32 (o, GRUB_OHCI_REG_INTSTATUS) & 0x4) == 0)
&& !err_unrec);
/* Now it should be safe to change CONTROL and BULK lists. */
/* Important cleaning. */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, (1 << 1)); /* Clears WDH */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLCURR, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKCURR, 0);
if (err_unrec)
{
/* Do OHCI reset in case of unrecoverable error - maybe we will need
* do more - re-enumerate bus etc. (?) */
/* Suspend the OHCI by issuing a reset. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, 1); /* XXX: Magic. */
grub_millisleep (1);
grub_dprintf ("ohci", "Unrecoverable error - OHCI reset\n");
/* Misc. resets. */
o->hcca->donehead = 0;
grub_ohci_writereg32 (o, GRUB_OHCI_REG_INTSTATUS, 0x7f); /* Clears everything */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLCURR, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKCURR, 0);
/* Enable the OHCI. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, (2 << 6));
}
grub_dprintf ("ohci", "OHCI finished, freeing, err=0x%02x\n", err);
grub_dma_free (td_list_chunk);
grub_dma_free (ed_chunk);
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_dprintf ("ohci", "begin of portstatus=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port));
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port,
GRUB_OHCI_SET_PORT_RESET);
grub_millisleep (50); /* For root hub should be nominaly 50ms */
/* End the reset signaling. */
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port,
GRUB_OHCI_SET_PORT_RESET_STATUS_CHANGE);
grub_millisleep (10);
if (enable)
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port,
GRUB_OHCI_SET_PORT_ENABLE);
else
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + port,
GRUB_OHCI_CLEAR_PORT_ENABLE);
grub_millisleep (10);
grub_dprintf ("ohci", "end of portstatus=0x%02x\n",
grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBPORT + port));
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 grub_err_t
grub_ohci_fini_hw (int noreturn __attribute__ ((unused)))
{
struct grub_ohci *o;
for (o = ohci; o; o = o->next)
{
int i, nports = grub_ohci_readreg32 (o, GRUB_OHCI_REG_RHUBA) & 0xff;
for (i = 0; i < nports; i++)
grub_ohci_writereg32 (o, GRUB_OHCI_REG_RHUBPORT + i,
GRUB_OHCI_CLEAR_PORT_ENABLE);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROLCURR, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_BULKCURR, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_DONEHEAD, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CONTROL, 0);
grub_ohci_writereg32 (o, GRUB_OHCI_REG_CMDSTATUS, 1);
}
grub_millisleep (10);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_ohci_restore_hw (void)
{
struct grub_ohci *o;
for (o = ohci; o; o = o->next)
grub_ohci_writereg32 (o, GRUB_OHCI_REG_HCCA, o->hcca_addr);
return GRUB_ERR_NONE;
}
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_loader_register_preboot_hook (grub_ohci_fini_hw, grub_ohci_restore_hw,
GRUB_LOADER_PREBOOT_HOOK_PRIO_DISK);
}
GRUB_MOD_FINI(ohci)
{
grub_ohci_fini_hw (0);
grub_usb_controller_dev_unregister (&usb_controller);
}
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