![Chunfeng Yun](/assets/img/avatar_default.png)
when a LS or FS device doesn't connect though a HS hub, the @bPkts field of its periodic endpoint context should be set to 1. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
426 lines
12 KiB
C
426 lines
12 KiB
C
/*
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* Copyright (c) 2015 MediaTek Inc.
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* Author:
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* Zhigang.Wei <zhigang.wei@mediatek.com>
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* Chunfeng.Yun <chunfeng.yun@mediatek.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program 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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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "xhci.h"
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#include "xhci-mtk.h"
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#define SS_BW_BOUNDARY 51000
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/* table 5-5. High-speed Isoc Transaction Limits in usb_20 spec */
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#define HS_BW_BOUNDARY 6144
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/* usb2 spec section11.18.1: at most 188 FS bytes per microframe */
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#define FS_PAYLOAD_MAX 188
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/* mtk scheduler bitmasks */
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#define EP_BPKTS(p) ((p) & 0x3f)
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#define EP_BCSCOUNT(p) (((p) & 0x7) << 8)
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#define EP_BBM(p) ((p) << 11)
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#define EP_BOFFSET(p) ((p) & 0x3fff)
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#define EP_BREPEAT(p) (((p) & 0x7fff) << 16)
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static int is_fs_or_ls(enum usb_device_speed speed)
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{
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return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
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}
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/*
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* get the index of bandwidth domains array which @ep belongs to.
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*
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* the bandwidth domain array is saved to @sch_array of struct xhci_hcd_mtk,
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* each HS root port is treated as a single bandwidth domain,
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* but each SS root port is treated as two bandwidth domains, one for IN eps,
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* one for OUT eps.
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* @real_port value is defined as follow according to xHCI spec:
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* 1 for SSport0, ..., N+1 for SSportN, N+2 for HSport0, N+3 for HSport1, etc
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* so the bandwidth domain array is organized as follow for simplification:
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* SSport0-OUT, SSport0-IN, ..., SSportX-OUT, SSportX-IN, HSport0, ..., HSportY
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*/
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static int get_bw_index(struct xhci_hcd *xhci, struct usb_device *udev,
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struct usb_host_endpoint *ep)
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{
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struct xhci_virt_device *virt_dev;
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int bw_index;
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virt_dev = xhci->devs[udev->slot_id];
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if (udev->speed == USB_SPEED_SUPER) {
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if (usb_endpoint_dir_out(&ep->desc))
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bw_index = (virt_dev->real_port - 1) * 2;
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else
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bw_index = (virt_dev->real_port - 1) * 2 + 1;
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} else {
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/* add one more for each SS port */
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bw_index = virt_dev->real_port + xhci->num_usb3_ports - 1;
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}
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return bw_index;
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}
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static void setup_sch_info(struct usb_device *udev,
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struct xhci_ep_ctx *ep_ctx, struct mu3h_sch_ep_info *sch_ep)
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{
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u32 ep_type;
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u32 ep_interval;
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u32 max_packet_size;
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u32 max_burst;
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u32 mult;
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u32 esit_pkts;
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ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
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ep_interval = CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
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max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
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max_burst = CTX_TO_MAX_BURST(le32_to_cpu(ep_ctx->ep_info2));
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mult = CTX_TO_EP_MULT(le32_to_cpu(ep_ctx->ep_info));
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sch_ep->esit = 1 << ep_interval;
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sch_ep->offset = 0;
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sch_ep->burst_mode = 0;
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if (udev->speed == USB_SPEED_HIGH) {
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sch_ep->cs_count = 0;
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/*
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* usb_20 spec section5.9
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* a single microframe is enough for HS synchromous endpoints
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* in a interval
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*/
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sch_ep->num_budget_microframes = 1;
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sch_ep->repeat = 0;
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/*
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* xHCI spec section6.2.3.4
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* @max_burst is the number of additional transactions
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* opportunities per microframe
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*/
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sch_ep->pkts = max_burst + 1;
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sch_ep->bw_cost_per_microframe = max_packet_size * sch_ep->pkts;
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} else if (udev->speed == USB_SPEED_SUPER) {
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/* usb3_r1 spec section4.4.7 & 4.4.8 */
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sch_ep->cs_count = 0;
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esit_pkts = (mult + 1) * (max_burst + 1);
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if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
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sch_ep->pkts = esit_pkts;
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sch_ep->num_budget_microframes = 1;
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sch_ep->repeat = 0;
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}
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if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
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if (esit_pkts <= sch_ep->esit)
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sch_ep->pkts = 1;
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else
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sch_ep->pkts = roundup_pow_of_two(esit_pkts)
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/ sch_ep->esit;
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sch_ep->num_budget_microframes =
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DIV_ROUND_UP(esit_pkts, sch_ep->pkts);
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if (sch_ep->num_budget_microframes > 1)
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sch_ep->repeat = 1;
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else
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sch_ep->repeat = 0;
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}
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sch_ep->bw_cost_per_microframe = max_packet_size * sch_ep->pkts;
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} else if (is_fs_or_ls(udev->speed)) {
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/*
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* usb_20 spec section11.18.4
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* assume worst cases
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*/
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sch_ep->repeat = 0;
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sch_ep->pkts = 1; /* at most one packet for each microframe */
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if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
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sch_ep->cs_count = 3; /* at most need 3 CS*/
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/* one for SS and one for budgeted transaction */
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sch_ep->num_budget_microframes = sch_ep->cs_count + 2;
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sch_ep->bw_cost_per_microframe = max_packet_size;
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}
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if (ep_type == ISOC_OUT_EP) {
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/*
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* the best case FS budget assumes that 188 FS bytes
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* occur in each microframe
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*/
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sch_ep->num_budget_microframes = DIV_ROUND_UP(
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max_packet_size, FS_PAYLOAD_MAX);
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sch_ep->bw_cost_per_microframe = FS_PAYLOAD_MAX;
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sch_ep->cs_count = sch_ep->num_budget_microframes;
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}
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if (ep_type == ISOC_IN_EP) {
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/* at most need additional two CS. */
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sch_ep->cs_count = DIV_ROUND_UP(
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max_packet_size, FS_PAYLOAD_MAX) + 2;
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sch_ep->num_budget_microframes = sch_ep->cs_count + 2;
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sch_ep->bw_cost_per_microframe = FS_PAYLOAD_MAX;
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}
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}
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}
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/* Get maximum bandwidth when we schedule at offset slot. */
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static u32 get_max_bw(struct mu3h_sch_bw_info *sch_bw,
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struct mu3h_sch_ep_info *sch_ep, u32 offset)
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{
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u32 num_esit;
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u32 max_bw = 0;
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int i;
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int j;
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num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
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for (i = 0; i < num_esit; i++) {
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u32 base = offset + i * sch_ep->esit;
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for (j = 0; j < sch_ep->num_budget_microframes; j++) {
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if (sch_bw->bus_bw[base + j] > max_bw)
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max_bw = sch_bw->bus_bw[base + j];
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}
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}
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return max_bw;
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}
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static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
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struct mu3h_sch_ep_info *sch_ep, int bw_cost)
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{
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u32 num_esit;
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u32 base;
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int i;
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int j;
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num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
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for (i = 0; i < num_esit; i++) {
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base = sch_ep->offset + i * sch_ep->esit;
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for (j = 0; j < sch_ep->num_budget_microframes; j++)
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sch_bw->bus_bw[base + j] += bw_cost;
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}
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}
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static int check_sch_bw(struct usb_device *udev,
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struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
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{
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u32 offset;
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u32 esit;
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u32 num_budget_microframes;
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u32 min_bw;
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u32 min_index;
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u32 worst_bw;
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u32 bw_boundary;
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if (sch_ep->esit > XHCI_MTK_MAX_ESIT)
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sch_ep->esit = XHCI_MTK_MAX_ESIT;
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esit = sch_ep->esit;
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num_budget_microframes = sch_ep->num_budget_microframes;
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/*
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* Search through all possible schedule microframes.
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* and find a microframe where its worst bandwidth is minimum.
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*/
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min_bw = ~0;
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min_index = 0;
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for (offset = 0; offset < esit; offset++) {
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if ((offset + num_budget_microframes) > sch_ep->esit)
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break;
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/*
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* usb_20 spec section11.18:
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* must never schedule Start-Split in Y6
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*/
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if (is_fs_or_ls(udev->speed) && (offset % 8 == 6))
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continue;
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worst_bw = get_max_bw(sch_bw, sch_ep, offset);
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if (min_bw > worst_bw) {
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min_bw = worst_bw;
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min_index = offset;
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}
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if (min_bw == 0)
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break;
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}
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sch_ep->offset = min_index;
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bw_boundary = (udev->speed == USB_SPEED_SUPER)
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? SS_BW_BOUNDARY : HS_BW_BOUNDARY;
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/* check bandwidth */
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if (min_bw + sch_ep->bw_cost_per_microframe > bw_boundary)
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return -ERANGE;
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/* update bus bandwidth info */
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update_bus_bw(sch_bw, sch_ep, sch_ep->bw_cost_per_microframe);
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return 0;
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}
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static bool need_bw_sch(struct usb_host_endpoint *ep,
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enum usb_device_speed speed, int has_tt)
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{
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/* only for periodic endpoints */
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if (usb_endpoint_xfer_control(&ep->desc)
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|| usb_endpoint_xfer_bulk(&ep->desc))
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return false;
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/*
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* for LS & FS periodic endpoints which its device is not behind
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* a TT are also ignored, root-hub will schedule them directly,
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* but need set @bpkts field of endpoint context to 1.
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*/
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if (is_fs_or_ls(speed) && !has_tt)
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return false;
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return true;
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}
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int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)
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{
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struct mu3h_sch_bw_info *sch_array;
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int num_usb_bus;
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int i;
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/* ss IN and OUT are separated */
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num_usb_bus = mtk->num_u3_ports * 2 + mtk->num_u2_ports;
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sch_array = kcalloc(num_usb_bus, sizeof(*sch_array), GFP_KERNEL);
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if (sch_array == NULL)
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return -ENOMEM;
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for (i = 0; i < num_usb_bus; i++)
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INIT_LIST_HEAD(&sch_array[i].bw_ep_list);
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mtk->sch_array = sch_array;
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return 0;
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}
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EXPORT_SYMBOL_GPL(xhci_mtk_sch_init);
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void xhci_mtk_sch_exit(struct xhci_hcd_mtk *mtk)
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{
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kfree(mtk->sch_array);
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}
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EXPORT_SYMBOL_GPL(xhci_mtk_sch_exit);
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int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
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struct usb_host_endpoint *ep)
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{
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struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
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struct xhci_hcd *xhci;
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struct xhci_ep_ctx *ep_ctx;
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struct xhci_slot_ctx *slot_ctx;
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struct xhci_virt_device *virt_dev;
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struct mu3h_sch_bw_info *sch_bw;
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struct mu3h_sch_ep_info *sch_ep;
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struct mu3h_sch_bw_info *sch_array;
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unsigned int ep_index;
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int bw_index;
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int ret = 0;
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xhci = hcd_to_xhci(hcd);
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virt_dev = xhci->devs[udev->slot_id];
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ep_index = xhci_get_endpoint_index(&ep->desc);
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slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
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ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
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sch_array = mtk->sch_array;
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xhci_dbg(xhci, "%s() type:%d, speed:%d, mpkt:%d, dir:%d, ep:%p\n",
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__func__, usb_endpoint_type(&ep->desc), udev->speed,
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GET_MAX_PACKET(usb_endpoint_maxp(&ep->desc)),
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usb_endpoint_dir_in(&ep->desc), ep);
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if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT)) {
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/*
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* set @bpkts to 1 if it is LS or FS periodic endpoint, and its
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* device does not connected through an external HS hub
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*/
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if (usb_endpoint_xfer_int(&ep->desc)
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|| usb_endpoint_xfer_isoc(&ep->desc))
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ep_ctx->reserved[0] |= cpu_to_le32(EP_BPKTS(1));
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return 0;
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}
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bw_index = get_bw_index(xhci, udev, ep);
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sch_bw = &sch_array[bw_index];
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sch_ep = kzalloc(sizeof(struct mu3h_sch_ep_info), GFP_NOIO);
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if (!sch_ep)
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return -ENOMEM;
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setup_sch_info(udev, ep_ctx, sch_ep);
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ret = check_sch_bw(udev, sch_bw, sch_ep);
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if (ret) {
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xhci_err(xhci, "Not enough bandwidth!\n");
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kfree(sch_ep);
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return -ENOSPC;
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}
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list_add_tail(&sch_ep->endpoint, &sch_bw->bw_ep_list);
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sch_ep->ep = ep;
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ep_ctx->reserved[0] |= cpu_to_le32(EP_BPKTS(sch_ep->pkts)
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| EP_BCSCOUNT(sch_ep->cs_count) | EP_BBM(sch_ep->burst_mode));
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ep_ctx->reserved[1] |= cpu_to_le32(EP_BOFFSET(sch_ep->offset)
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| EP_BREPEAT(sch_ep->repeat));
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xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
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sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
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sch_ep->offset, sch_ep->repeat);
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return 0;
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}
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EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);
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void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
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struct usb_host_endpoint *ep)
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{
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struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
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struct xhci_hcd *xhci;
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struct xhci_slot_ctx *slot_ctx;
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struct xhci_virt_device *virt_dev;
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struct mu3h_sch_bw_info *sch_array;
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struct mu3h_sch_bw_info *sch_bw;
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struct mu3h_sch_ep_info *sch_ep;
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int bw_index;
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xhci = hcd_to_xhci(hcd);
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virt_dev = xhci->devs[udev->slot_id];
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slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
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sch_array = mtk->sch_array;
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xhci_dbg(xhci, "%s() type:%d, speed:%d, mpks:%d, dir:%d, ep:%p\n",
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__func__, usb_endpoint_type(&ep->desc), udev->speed,
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GET_MAX_PACKET(usb_endpoint_maxp(&ep->desc)),
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usb_endpoint_dir_in(&ep->desc), ep);
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if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT))
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return;
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bw_index = get_bw_index(xhci, udev, ep);
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sch_bw = &sch_array[bw_index];
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list_for_each_entry(sch_ep, &sch_bw->bw_ep_list, endpoint) {
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if (sch_ep->ep == ep) {
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update_bus_bw(sch_bw, sch_ep,
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-sch_ep->bw_cost_per_microframe);
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list_del(&sch_ep->endpoint);
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kfree(sch_ep);
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break;
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}
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}
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}
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EXPORT_SYMBOL_GPL(xhci_mtk_drop_ep_quirk);
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