689 lines
17 KiB
C
689 lines
17 KiB
C
/* uhci.c - UHCI Support. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/usb.h>
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#include <grub/usbtrans.h>
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#include <grub/pci.h>
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#include <grub/i386/io.h>
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#include <grub/time.h>
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#define GRUB_UHCI_IOMASK (0x7FF << 5)
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typedef enum
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{
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GRUB_UHCI_REG_USBCMD = 0x00,
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GRUB_UHCI_REG_FLBASEADD = 0x08,
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GRUB_UHCI_REG_PORTSC1 = 0x10,
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GRUB_UHCI_REG_PORTSC2 = 0x12
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} grub_uhci_reg_t;
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#define GRUB_UHCI_LINK_TERMINATE 1
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#define GRUB_UHCI_LINK_QUEUE_HEAD 2
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/* UHCI Queue Head. */
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struct grub_uhci_qh
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{
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/* Queue head link pointer which points to the next queue head. */
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grub_uint32_t linkptr;
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/* Queue element link pointer which points to the first data object
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within the queue. */
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grub_uint32_t elinkptr;
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/* Queue heads are aligned on 16 bytes, pad so a queue head is 16
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bytes so we can store many in a 4K page. */
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grub_uint8_t pad[8];
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} __attribute__ ((packed));
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/* UHCI Transfer Descriptor. */
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struct grub_uhci_td
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{
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/* Pointer to the next TD in the list. */
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grub_uint32_t linkptr;
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/* Control and status bits. */
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grub_uint32_t ctrl_status;
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/* All information required to transfer the Token packet. */
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grub_uint32_t token;
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/* A pointer to the data buffer, UHCI requires this pointer to be 32
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bits. */
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grub_uint32_t buffer;
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/* Another linkptr that is not overwritten by the Host Controller.
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This is GRUB specific. */
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grub_uint32_t linkptr2;
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/* 3 additional 32 bits words reserved for the Host Controller Driver. */
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grub_uint32_t data[3];
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} __attribute__ ((packed));
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typedef volatile struct grub_uhci_td *grub_uhci_td_t;
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typedef volatile struct grub_uhci_qh *grub_uhci_qh_t;
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struct grub_uhci
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{
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int iobase;
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grub_uint32_t *framelist;
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/* 256 Queue Heads. */
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grub_uhci_qh_t qh;
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/* 256 Transfer Descriptors. */
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grub_uhci_td_t td;
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/* Free Transfer Descriptors. */
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grub_uhci_td_t tdfree;
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struct grub_uhci *next;
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};
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static struct grub_uhci *uhci;
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static grub_uint16_t
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grub_uhci_readreg16 (struct grub_uhci *u, grub_uhci_reg_t reg)
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{
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return grub_inw (u->iobase + reg);
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}
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#if 0
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static grub_uint32_t
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grub_uhci_readreg32 (struct grub_uhci *u, grub_uhci_reg_t reg)
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{
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return grub_inl (u->iobase + reg);
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}
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#endif
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static void
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grub_uhci_writereg16 (struct grub_uhci *u,
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grub_uhci_reg_t reg, grub_uint16_t val)
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{
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grub_outw (val, u->iobase + reg);
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}
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static void
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grub_uhci_writereg32 (struct grub_uhci *u,
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grub_uhci_reg_t reg, grub_uint32_t val)
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{
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grub_outl (val, u->iobase + reg);
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}
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static grub_err_t
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grub_uhci_portstatus (grub_usb_controller_t dev,
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unsigned int port, unsigned int enable);
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/* Iterate over all PCI devices. Determine if a device is an UHCI
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controller. If this is the case, initialize it. */
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static int NESTED_FUNC_ATTR
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grub_uhci_pci_iter (grub_pci_device_t dev,
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grub_pci_id_t pciid __attribute__((unused)))
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{
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grub_uint32_t class_code;
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grub_uint32_t class;
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grub_uint32_t subclass;
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grub_uint32_t interf;
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grub_uint32_t base;
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grub_uint32_t fp;
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grub_pci_address_t addr;
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struct grub_uhci *u;
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int i;
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
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class_code = grub_pci_read (addr) >> 8;
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interf = class_code & 0xFF;
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subclass = (class_code >> 8) & 0xFF;
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class = class_code >> 16;
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/* If this is not an UHCI controller, just return. */
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if (class != 0x0c || subclass != 0x03 || interf != 0x00)
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return 0;
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/* Determine IO base address. */
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG4);
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base = grub_pci_read (addr);
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/* Stop if there is no IO space base address defined. */
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if (! (base & 1))
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return 0;
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/* Allocate memory for the controller and register it. */
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u = grub_zalloc (sizeof (*u));
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if (! u)
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return 1;
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u->iobase = base & GRUB_UHCI_IOMASK;
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grub_dprintf ("uhci", "class=0x%02x 0x%02x interface 0x%02x base=0x%x\n",
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class, subclass, interf, u->iobase);
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/* Reserve a page for the frame list. */
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u->framelist = grub_memalign (4096, 4096);
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if (! u->framelist)
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goto fail;
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/* The framelist pointer of UHCI is only 32 bits, make sure this
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code works on on 64 bits architectures. */
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#if GRUB_CPU_SIZEOF_VOID_P == 8
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if ((grub_uint64_t) u->framelist >> 32)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"allocated frame list memory not <4GB");
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goto fail;
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}
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#endif
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/* The QH pointer of UHCI is only 32 bits, make sure this
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code works on on 64 bits architectures. */
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u->qh = (grub_uhci_qh_t) grub_memalign (4096, 4096);
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if (! u->qh)
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goto fail;
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#if GRUB_CPU_SIZEOF_VOID_P == 8
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if ((grub_uint64_t) u->qh >> 32)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "allocated QH memory not <4GB");
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goto fail;
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}
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#endif
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/* The TD pointer of UHCI is only 32 bits, make sure this
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code works on on 64 bits architectures. */
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u->td = (grub_uhci_td_t) grub_memalign (4096, 4096*2);
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if (! u->td)
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goto fail;
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#if GRUB_CPU_SIZEOF_VOID_P == 8
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if ((grub_uint64_t) u->td >> 32)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "allocated TD memory not <4GB");
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goto fail;
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}
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#endif
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/* Link all Transfer Descriptors in a list of available Transfer
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Descriptors. */
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for (i = 0; i < 256; i++)
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u->td[i].linkptr = (grub_uint32_t) &u->td[i + 1];
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u->td[255 - 1].linkptr = 0;
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u->tdfree = u->td;
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/* Make sure UHCI is disabled! */
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grub_uhci_writereg16 (u, GRUB_UHCI_REG_USBCMD, 0);
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/* Setup the frame list pointers. Since no isochronous transfers
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are and will be supported, they all point to the (same!) queue
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head. */
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fp = (grub_uint32_t) u->qh & (~15);
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/* Mark this as a queue head. */
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fp |= 2;
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for (i = 0; i < 1024; i++)
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u->framelist[i] = fp;
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/* Program the framelist address into the UHCI controller. */
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grub_uhci_writereg32 (u, GRUB_UHCI_REG_FLBASEADD,
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(grub_uint32_t) u->framelist);
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/* Make the Queue Heads point to each other. */
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for (i = 0; i < 256; i++)
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{
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/* Point to the next QH. */
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u->qh[i].linkptr = (grub_uint32_t) (&u->qh[i + 1]) & (~15);
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/* This is a QH. */
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u->qh[i].linkptr |= GRUB_UHCI_LINK_QUEUE_HEAD;
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/* For the moment, do not point to a Transfer Descriptor. These
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are set at transfer time, so just terminate it. */
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u->qh[i].elinkptr = 1;
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}
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/* The last Queue Head should terminate. 256 are too many QHs so
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just use 50. */
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u->qh[50 - 1].linkptr = 1;
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/* Enable UHCI again. */
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grub_uhci_writereg16 (u, GRUB_UHCI_REG_USBCMD, 1 | (1 << 7));
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/* UHCI is initialized and ready for transfers. */
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grub_dprintf ("uhci", "UHCI initialized\n");
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#if 0
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{
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int i;
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for (i = 0; i < 10; i++)
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{
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grub_uint16_t frnum;
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frnum = grub_uhci_readreg16 (u, 6);
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grub_dprintf ("uhci", "Framenum=%d\n", frnum);
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grub_millisleep (100);
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}
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}
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#endif
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/* Link to uhci now that initialisation is successful. */
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u->next = uhci;
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uhci = u;
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return 0;
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fail:
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if (u)
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{
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grub_free ((void *) u->qh);
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grub_free (u->framelist);
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}
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grub_free (u);
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return 1;
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}
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static void
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grub_uhci_inithw (void)
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{
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grub_pci_iterate (grub_uhci_pci_iter);
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}
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static grub_uhci_td_t
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grub_alloc_td (struct grub_uhci *u)
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{
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grub_uhci_td_t ret;
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/* Check if there is a Transfer Descriptor available. */
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if (! u->tdfree)
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return NULL;
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ret = u->tdfree;
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u->tdfree = (grub_uhci_td_t) u->tdfree->linkptr;
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return ret;
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}
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static void
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grub_free_td (struct grub_uhci *u, grub_uhci_td_t td)
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{
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td->linkptr = (grub_uint32_t) u->tdfree;
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u->tdfree = td;
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}
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static void
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grub_free_queue (struct grub_uhci *u, grub_uhci_td_t td)
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{
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/* Free the TDs in this queue. */
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while (td)
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{
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grub_uhci_td_t tdprev;
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/* Unlink the queue. */
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tdprev = td;
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td = (grub_uhci_td_t) td->linkptr2;
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/* Free the TD. */
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grub_free_td (u, tdprev);
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}
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}
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static grub_uhci_qh_t
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grub_alloc_qh (struct grub_uhci *u,
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grub_transaction_type_t tr __attribute__((unused)))
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{
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int i;
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grub_uhci_qh_t qh;
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/* Look for a Queue Head for this transfer. Skip the first QH if
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this is a Interrupt Transfer. */
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#if 0
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if (tr == GRUB_USB_TRANSACTION_TYPE_INTERRUPT)
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i = 0;
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else
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#endif
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i = 1;
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for (; i < 255; i++)
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{
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if (u->qh[i].elinkptr & 1)
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break;
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}
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qh = &u->qh[i];
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if (! (qh->elinkptr & 1))
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"no free queue heads available");
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return NULL;
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}
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return qh;
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}
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static grub_uhci_td_t
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grub_uhci_transaction (struct grub_uhci *u, unsigned int endp,
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grub_transfer_type_t type, unsigned int addr,
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unsigned int toggle, grub_size_t size,
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char *data)
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{
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grub_uhci_td_t td;
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static const unsigned int tf[] = { 0x69, 0xE1, 0x2D };
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/* XXX: Check if data is <4GB. If it isn't, just copy stuff around.
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This is only relevant for 64 bits architectures. */
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/* Grab a free Transfer Descriptor and initialize it. */
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td = grub_alloc_td (u);
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if (! td)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"no transfer descriptors available for UHCI transfer");
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return 0;
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}
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grub_dprintf ("uhci",
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"transaction: endp=%d, type=%d, addr=%d, toggle=%d, size=%d data=%p td=%p\n",
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endp, type, addr, toggle, size, data, td);
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/* Don't point to any TD, just terminate. */
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td->linkptr = 1;
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/* Active! Only retry a transfer 3 times. */
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td->ctrl_status = (1 << 23) | (3 << 27);
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/* If zero bytes are transmitted, size is 0x7FF. Otherwise size is
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size-1. */
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if (size == 0)
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size = 0x7FF;
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else
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size = size - 1;
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/* Setup whatever is required for the token packet. */
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td->token = ((size << 21) | (toggle << 19) | (endp << 15)
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| (addr << 8) | tf[type]);
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td->buffer = (grub_uint32_t) data;
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return td;
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}
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static grub_usb_err_t
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grub_uhci_transfer (grub_usb_controller_t dev,
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grub_usb_transfer_t transfer)
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{
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struct grub_uhci *u = (struct grub_uhci *) dev->data;
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grub_uhci_qh_t qh;
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grub_uhci_td_t td;
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grub_uhci_td_t td_first = NULL;
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grub_uhci_td_t td_prev = NULL;
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grub_usb_err_t err = GRUB_USB_ERR_NONE;
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int i;
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grub_uint64_t endtime;
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/* Allocate a queue head for the transfer queue. */
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qh = grub_alloc_qh (u, GRUB_USB_TRANSACTION_TYPE_CONTROL);
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if (! qh)
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return grub_errno;
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for (i = 0; i < transfer->transcnt; i++)
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{
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grub_usb_transaction_t tr = &transfer->transactions[i];
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td = grub_uhci_transaction (u, transfer->endpoint, tr->pid,
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transfer->devaddr, tr->toggle,
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tr->size, tr->data);
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if (! td)
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{
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/* Terminate and free. */
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td_prev->linkptr2 = 0;
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td_prev->linkptr = 1;
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if (td_first)
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grub_free_queue (u, td_first);
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return GRUB_USB_ERR_INTERNAL;
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}
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if (! td_first)
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td_first = td;
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else
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{
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td_prev->linkptr2 = (grub_uint32_t) td;
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td_prev->linkptr = (grub_uint32_t) td;
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td_prev->linkptr |= 4;
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}
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td_prev = td;
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}
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td_prev->linkptr2 = 0;
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td_prev->linkptr = 1;
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grub_dprintf ("uhci", "setup transaction %d\n", transfer->type);
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/* Link it into the queue and terminate. Now the transaction can
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take place. */
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qh->elinkptr = (grub_uint32_t) td_first;
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grub_dprintf ("uhci", "initiate transaction\n");
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/* Wait until either the transaction completed or an error
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occurred. */
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endtime = grub_get_time_ms () + 1000;
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for (;;)
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{
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grub_uhci_td_t errtd;
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errtd = (grub_uhci_td_t) (qh->elinkptr & ~0x0f);
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grub_dprintf ("uhci", ">t status=0x%02x data=0x%02x td=%p\n",
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errtd->ctrl_status, errtd->buffer & (~15), errtd);
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/* Check if the transaction completed. */
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if (qh->elinkptr & 1)
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break;
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grub_dprintf ("uhci", "t status=0x%02x\n", errtd->ctrl_status);
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/* Check if the TD is not longer active. */
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if (! (errtd->ctrl_status & (1 << 23)))
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{
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grub_dprintf ("uhci", ">>t status=0x%02x\n", errtd->ctrl_status);
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/* Check if the endpoint is stalled. */
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if (errtd->ctrl_status & (1 << 22))
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err = GRUB_USB_ERR_STALL;
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/* Check if an error related to the data buffer occurred. */
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if (errtd->ctrl_status & (1 << 21))
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err = GRUB_USB_ERR_DATA;
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/* Check if a babble error occurred. */
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if (errtd->ctrl_status & (1 << 20))
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||
err = GRUB_USB_ERR_BABBLE;
|
||
|
||
/* Check if a NAK occurred. */
|
||
if (errtd->ctrl_status & (1 << 19))
|
||
err = GRUB_USB_ERR_NAK;
|
||
|
||
/* Check if a timeout occurred. */
|
||
if (errtd->ctrl_status & (1 << 18))
|
||
err = GRUB_USB_ERR_TIMEOUT;
|
||
|
||
/* Check if a bitstuff error occurred. */
|
||
if (errtd->ctrl_status & (1 << 17))
|
||
err = GRUB_USB_ERR_BITSTUFF;
|
||
|
||
if (err)
|
||
goto fail;
|
||
|
||
/* Fall through, no errors occurred, so the QH might be
|
||
updated. */
|
||
grub_dprintf ("uhci", "transaction fallthrough\n");
|
||
}
|
||
if (grub_get_time_ms () > endtime)
|
||
{
|
||
err = GRUB_USB_ERR_STALL;
|
||
grub_dprintf ("uhci", "transaction timed out\n");
|
||
goto fail;
|
||
}
|
||
grub_cpu_idle ();
|
||
}
|
||
|
||
grub_dprintf ("uhci", "transaction complete\n");
|
||
|
||
fail:
|
||
|
||
grub_dprintf ("uhci", "transaction failed\n");
|
||
|
||
/* Place the QH back in the free list and deallocate the associated
|
||
TDs. */
|
||
qh->elinkptr = 1;
|
||
grub_free_queue (u, td_first);
|
||
|
||
return err;
|
||
}
|
||
|
||
static int
|
||
grub_uhci_iterate (int (*hook) (grub_usb_controller_t dev))
|
||
{
|
||
struct grub_uhci *u;
|
||
struct grub_usb_controller dev;
|
||
|
||
for (u = uhci; u; u = u->next)
|
||
{
|
||
dev.data = u;
|
||
if (hook (&dev))
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_uhci_portstatus (grub_usb_controller_t dev,
|
||
unsigned int port, unsigned int enable)
|
||
{
|
||
struct grub_uhci *u = (struct grub_uhci *) dev->data;
|
||
int reg;
|
||
unsigned int status;
|
||
grub_uint64_t endtime;
|
||
|
||
grub_dprintf ("uhci", "enable=%d port=%d\n", enable, port);
|
||
|
||
if (port == 0)
|
||
reg = GRUB_UHCI_REG_PORTSC1;
|
||
else if (port == 1)
|
||
reg = GRUB_UHCI_REG_PORTSC2;
|
||
else
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
"UHCI Root Hub port does not exist");
|
||
|
||
status = grub_uhci_readreg16 (u, reg);
|
||
grub_dprintf ("uhci", "detect=0x%02x\n", status);
|
||
|
||
/* Reset the port. */
|
||
grub_uhci_writereg16 (u, reg, enable << 9);
|
||
|
||
/* Wait for the reset to complete. XXX: How long exactly? */
|
||
grub_millisleep (10);
|
||
status = grub_uhci_readreg16 (u, reg);
|
||
grub_uhci_writereg16 (u, reg, status & ~(1 << 9));
|
||
grub_dprintf ("uhci", "reset completed\n");
|
||
grub_millisleep (10);
|
||
|
||
/* Enable the port. */
|
||
grub_uhci_writereg16 (u, reg, enable << 2);
|
||
grub_millisleep (10);
|
||
|
||
grub_dprintf ("uhci", "waiting for the port to be enabled\n");
|
||
|
||
endtime = grub_get_time_ms () + 1000;
|
||
while (! (grub_uhci_readreg16 (u, reg) & (1 << 2)))
|
||
if (grub_get_time_ms () > endtime)
|
||
return grub_error (GRUB_ERR_IO, "UHCI Timed out");
|
||
|
||
status = grub_uhci_readreg16 (u, reg);
|
||
grub_dprintf ("uhci", ">3detect=0x%02x\n", status);
|
||
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
static grub_usb_speed_t
|
||
grub_uhci_detect_dev (grub_usb_controller_t dev, int port)
|
||
{
|
||
struct grub_uhci *u = (struct grub_uhci *) dev->data;
|
||
int reg;
|
||
unsigned int status;
|
||
|
||
if (port == 0)
|
||
reg = GRUB_UHCI_REG_PORTSC1;
|
||
else if (port == 1)
|
||
reg = GRUB_UHCI_REG_PORTSC2;
|
||
else
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
"UHCI Root Hub port does not exist");
|
||
|
||
status = grub_uhci_readreg16 (u, reg);
|
||
|
||
grub_dprintf ("uhci", "detect=0x%02x port=%d\n", status, port);
|
||
|
||
if (! (status & 1))
|
||
return GRUB_USB_SPEED_NONE;
|
||
else if (status & (1 << 8))
|
||
return GRUB_USB_SPEED_LOW;
|
||
else
|
||
return GRUB_USB_SPEED_FULL;
|
||
}
|
||
|
||
static int
|
||
grub_uhci_hubports (grub_usb_controller_t dev __attribute__((unused)))
|
||
{
|
||
/* The root hub has exactly two ports. */
|
||
return 2;
|
||
}
|
||
|
||
|
||
static struct grub_usb_controller_dev usb_controller =
|
||
{
|
||
.name = "uhci",
|
||
.iterate = grub_uhci_iterate,
|
||
.transfer = grub_uhci_transfer,
|
||
.hubports = grub_uhci_hubports,
|
||
.portstatus = grub_uhci_portstatus,
|
||
.detect_dev = grub_uhci_detect_dev
|
||
};
|
||
|
||
GRUB_MOD_INIT(uhci)
|
||
{
|
||
grub_uhci_inithw ();
|
||
grub_usb_controller_dev_register (&usb_controller);
|
||
grub_dprintf ("uhci", "registered\n");
|
||
}
|
||
|
||
GRUB_MOD_FINI(uhci)
|
||
{
|
||
struct grub_uhci *u;
|
||
|
||
/* Disable all UHCI controllers. */
|
||
for (u = uhci; u; u = u->next)
|
||
grub_uhci_writereg16 (u, GRUB_UHCI_REG_USBCMD, 0);
|
||
|
||
/* Unregister the controller. */
|
||
grub_usb_controller_dev_unregister (&usb_controller);
|
||
}
|