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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
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/*
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* xHCI host controller driver
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*
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* Copyright (C) 2008 Intel Corp.
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*
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* Author: Sarah Sharp
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* Some code borrowed from the Linux EHCI driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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 this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/usb.h>
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#include "xhci.h"
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void xhci_mem_cleanup(struct xhci_hcd *xhci)
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{
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xhci->page_size = 0;
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xhci->page_shift = 0;
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}
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int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
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{
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unsigned int val, val2;
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u32 page_size;
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int i;
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page_size = xhci_readl(xhci, &xhci->op_regs->page_size);
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xhci_dbg(xhci, "Supported page size register = 0x%x\n", page_size);
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for (i = 0; i < 16; i++) {
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if ((0x1 & page_size) != 0)
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break;
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page_size = page_size >> 1;
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}
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if (i < 16)
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xhci_dbg(xhci, "Supported page size of %iK\n", (1 << (i+12)) / 1024);
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else
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xhci_warn(xhci, "WARN: no supported page size\n");
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/* Use 4K pages, since that's common and the minimum the HC supports */
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xhci->page_shift = 12;
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xhci->page_size = 1 << xhci->page_shift;
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xhci_dbg(xhci, "HCD page size set to %iK\n", xhci->page_size / 1024);
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/*
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* Program the Number of Device Slots Enabled field in the CONFIG
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* register with the max value of slots the HC can handle.
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*/
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val = HCS_MAX_SLOTS(xhci_readl(xhci, &xhci->cap_regs->hcs_params1));
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xhci_dbg(xhci, "// xHC can handle at most %d device slots.\n",
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(unsigned int) val);
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val2 = xhci_readl(xhci, &xhci->op_regs->config_reg);
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val |= (val2 & ~HCS_SLOTS_MASK);
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xhci_dbg(xhci, "// Setting Max device slots reg = 0x%x.\n",
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(unsigned int) val);
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xhci_writel(xhci, val, &xhci->op_regs->config_reg);
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xhci->ir_set = &xhci->run_regs->ir_set[0];
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return 0;
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fail:
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xhci_warn(xhci, "Couldn't initialize memory\n");
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xhci_mem_cleanup(xhci);
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return -ENOMEM;
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}
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