[patch v11 3/4] USB: add Cypress c67x00 OTG controller HCD driver
Grant Likely
grant.likely at secretlab.ca
Wed Apr 30 06:26:18 EST 2008
On Sun, Apr 27, 2008 at 12:59 AM, Peter Korsgaard <jacmet at sunsite.dk> wrote:
> This patch adds HCD support for the Cypress c67x00 family of devices.
>
> Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>
Acked-by: Grant Likely <grant.likely at secretlab.ca>
> ---
> drivers/usb/Makefile | 2
> drivers/usb/c67x00/Makefile | 9
> drivers/usb/c67x00/c67x00-drv.c | 13
> drivers/usb/c67x00/c67x00-hcd.c | 412 +++++++++++++
> drivers/usb/c67x00/c67x00-hcd.h | 133 ++++
> drivers/usb/c67x00/c67x00-ll-hpi.c | 75 ++
> drivers/usb/c67x00/c67x00-sched.c | 1170 +++++++++++++++++++++++++++++++++++++
> drivers/usb/c67x00/c67x00.h | 9
> drivers/usb/host/Kconfig | 13
> 9 files changed, 1836 insertions(+)
>
> Index: linux-2.6/drivers/usb/c67x00/c67x00-hcd.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/usb/c67x00/c67x00-hcd.c
> @@ -0,0 +1,412 @@
> +/*
> + * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
> + *
> + * Copyright (C) 2006-2008 Barco N.V.
> + * Derived from the Cypress cy7c67200/300 ezusb linux driver and
> + * based on multiple host controller drivers inside the linux kernel.
> + *
> + * This program 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 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program 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 this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb.h>
> +
> +#include "c67x00.h"
> +#include "c67x00-hcd.h"
> +
> +/* --------------------------------------------------------------------------
> + * Root Hub Support
> + */
> +
> +static __u8 c67x00_hub_des[] = {
> + 0x09, /* __u8 bLength; */
> + 0x29, /* __u8 bDescriptorType; Hub-descriptor */
> + 0x02, /* __u8 bNbrPorts; */
> + 0x00, /* __u16 wHubCharacteristics; */
> + 0x00, /* (per-port OC, no power switching) */
> + 0x32, /* __u8 bPwrOn2pwrGood; 2ms */
> + 0x00, /* __u8 bHubContrCurrent; 0 mA */
> + 0x00, /* __u8 DeviceRemovable; ** 7 Ports max ** */
> + 0xff, /* __u8 PortPwrCtrlMask; ** 7 ports max ** */
> +};
> +
> +static void c67x00_hub_reset_host_port(struct c67x00_sie *sie, int port)
> +{
> + struct c67x00_hcd *c67x00 = sie->private_data;
> + unsigned long flags;
> +
> + c67x00_ll_husb_reset(sie, port);
> +
> + spin_lock_irqsave(&c67x00->lock, flags);
> + c67x00_ll_husb_reset_port(sie, port);
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +
> + c67x00_ll_set_husb_eot(sie->dev, DEFAULT_EOT);
> +}
> +
> +static int c67x00_hub_status_data(struct usb_hcd *hcd, char *buf)
> +{
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + struct c67x00_sie *sie = c67x00->sie;
> + u16 status;
> + int i;
> +
> + *buf = 0;
> + status = c67x00_ll_usb_get_status(sie);
> + for (i = 0; i < C67X00_PORTS; i++)
> + if (status & PORT_CONNECT_CHANGE(i))
> + *buf |= (1 << i);
> +
> + /* bit 0 denotes hub change, b1..n port change */
> + *buf <<= 1;
> +
> + return !!*buf;
> +}
> +
> +static int c67x00_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
> + u16 wIndex, char *buf, u16 wLength)
> +{
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + struct c67x00_sie *sie = c67x00->sie;
> + u16 status, usb_status;
> + int len = 0;
> + unsigned int port = wIndex-1;
> + u16 wPortChange, wPortStatus;
> +
> + switch (typeReq) {
> +
> + case GetHubStatus:
> + *(__le32 *) buf = cpu_to_le32(0);
> + len = 4; /* hub power */
> + break;
> +
> + case GetPortStatus:
> + if (wIndex > C67X00_PORTS)
> + return -EPIPE;
> +
> + status = c67x00_ll_usb_get_status(sie);
> + usb_status = c67x00_ll_get_usb_ctl(sie);
> +
> + wPortChange = 0;
> + if (status & PORT_CONNECT_CHANGE(port))
> + wPortChange |= USB_PORT_STAT_C_CONNECTION;
> +
> + wPortStatus = USB_PORT_STAT_POWER;
> + if (!(status & PORT_SE0_STATUS(port)))
> + wPortStatus |= USB_PORT_STAT_CONNECTION;
> + if (usb_status & LOW_SPEED_PORT(port)) {
> + wPortStatus |= USB_PORT_STAT_LOW_SPEED;
> + c67x00->low_speed_ports |= (1 << port);
> + } else
> + c67x00->low_speed_ports &= ~(1 << port);
> +
> + if (usb_status & SOF_EOP_EN(port))
> + wPortStatus |= USB_PORT_STAT_ENABLE;
> +
> + *(__le16 *) buf = cpu_to_le16(wPortStatus);
> + *(__le16 *) (buf + 2) = cpu_to_le16(wPortChange);
> + len = 4;
> + break;
> +
> + case SetHubFeature: /* We don't implement these */
> + case ClearHubFeature:
> + switch (wValue) {
> + case C_HUB_OVER_CURRENT:
> + case C_HUB_LOCAL_POWER:
> + len = 0;
> + break;
> +
> + default:
> + return -EPIPE;
> + }
> + break;
> +
> + case SetPortFeature:
> + if (wIndex > C67X00_PORTS)
> + return -EPIPE;
> +
> + switch (wValue) {
> + case USB_PORT_FEAT_SUSPEND:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "SetPortFeature %d (SUSPEND)\n", port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_RESET:
> + c67x00_hub_reset_host_port(sie, port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_POWER:
> + /* Power always enabled */
> + len = 0;
> + break;
> +
> + default:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "%s: SetPortFeature %d (0x%04x) Error!\n",
> + __func__, port, wValue);
> + return -EPIPE;
> + }
> + break;
> +
> + case ClearPortFeature:
> + if (wIndex > C67X00_PORTS)
> + return -EPIPE;
> +
> + switch (wValue) {
> + case USB_PORT_FEAT_ENABLE:
> + /* Reset the port so that the c67x00 also notices the
> + * disconnect */
> + c67x00_hub_reset_host_port(sie, port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_C_ENABLE:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): C_ENABLE\n", port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_SUSPEND:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): SUSPEND\n", port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_C_SUSPEND:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): C_SUSPEND\n", port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_POWER:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): POWER\n", port);
> + return -EPIPE;
> +
> + case USB_PORT_FEAT_C_CONNECTION:
> + c67x00_ll_usb_clear_status(sie,
> + PORT_CONNECT_CHANGE(port));
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_C_OVER_CURRENT:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): OVER_CURRENT\n", port);
> + len = 0;
> + break;
> +
> + case USB_PORT_FEAT_C_RESET:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "ClearPortFeature (%d): C_RESET\n", port);
> + len = 0;
> + break;
> +
> + default:
> + dev_dbg(c67x00_hcd_dev(c67x00),
> + "%s: ClearPortFeature %d (0x%04x) Error!\n",
> + __func__, port, wValue);
> + return -EPIPE;
> + }
> + break;
> +
> + case GetHubDescriptor:
> + len = min_t(unsigned int, sizeof(c67x00_hub_des), wLength);
> + memcpy(buf, c67x00_hub_des, len);
> + break;
> +
> + default:
> + dev_dbg(c67x00_hcd_dev(c67x00), "%s: unknown\n", __func__);
> + return -EPIPE;
> + }
> +
> + return 0;
> +}
> +
> +/* ---------------------------------------------------------------------
> + * Main part of host controller driver
> + */
> +
> +/**
> + * c67x00_hcd_irq
> + *
> + * This function is called from the interrupt handler in c67x00-drv.c
> + */
> +static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
> +{
> + struct c67x00_hcd *c67x00 = sie->private_data;
> + struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
> +
> + /* Handle sie message flags */
> + if (msg) {
> + if (msg & HUSB_TDListDone)
> + c67x00_sched_kick(c67x00);
> + else
> + dev_warn(c67x00_hcd_dev(c67x00),
> + "Unknown SIE msg flag(s): 0x%04x\n", msg);
> + }
> +
> + if (unlikely(hcd->state == HC_STATE_HALT))
> + return;
> +
> + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
> + return;
> +
> + /* Handle Start of frame events */
> + if (int_status & SOFEOP_FLG(sie->sie_num)) {
> + c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
> + c67x00_sched_kick(c67x00);
> + set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
> + }
> +}
> +
> +/**
> + * c67x00_hcd_start: Host controller start hook
> + */
> +static int c67x00_hcd_start(struct usb_hcd *hcd)
> +{
> + hcd->uses_new_polling = 1;
> + hcd->state = HC_STATE_RUNNING;
> + hcd->poll_rh = 1;
> +
> + return 0;
> +}
> +
> +/**
> + * c67x00_hcd_stop: Host controller stop hook
> + */
> +static void c67x00_hcd_stop(struct usb_hcd *hcd)
> +{
> + /* Nothing to do */
> +}
> +
> +static int c67x00_hcd_get_frame(struct usb_hcd *hcd)
> +{
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + u16 temp_val;
> +
> + dev_dbg(c67x00_hcd_dev(c67x00), "%s\n", __func__);
> + temp_val = c67x00_ll_husb_get_frame(c67x00->sie);
> + temp_val &= HOST_FRAME_MASK;
> + return temp_val ? (temp_val - 1) : HOST_FRAME_MASK;
> +}
> +
> +static struct hc_driver c67x00_hc_driver = {
> + .description = "c67x00-hcd",
> + .product_desc = "Cypress C67X00 Host Controller",
> + .hcd_priv_size = sizeof(struct c67x00_hcd),
> + .flags = HCD_USB11 | HCD_MEMORY,
> +
> + /*
> + * basic lifecycle operations
> + */
> + .start = c67x00_hcd_start,
> + .stop = c67x00_hcd_stop,
> +
> + /*
> + * managing i/o requests and associated device resources
> + */
> + .urb_enqueue = c67x00_urb_enqueue,
> + .urb_dequeue = c67x00_urb_dequeue,
> + .endpoint_disable = c67x00_endpoint_disable,
> +
> + /*
> + * scheduling support
> + */
> + .get_frame_number = c67x00_hcd_get_frame,
> +
> + /*
> + * root hub support
> + */
> + .hub_status_data = c67x00_hub_status_data,
> + .hub_control = c67x00_hub_control,
> +};
> +
> +/* ---------------------------------------------------------------------
> + * Setup/Teardown routines
> + */
> +
> +int c67x00_hcd_probe(struct c67x00_sie *sie)
> +{
> + struct c67x00_hcd *c67x00;
> + struct usb_hcd *hcd;
> + unsigned long flags;
> + int retval;
> +
> + if (usb_disabled())
> + return -ENODEV;
> +
> + hcd = usb_create_hcd(&c67x00_hc_driver, sie_dev(sie), "c67x00_sie");
> + if (!hcd) {
> + retval = -ENOMEM;
> + goto err0;
> + }
> + c67x00 = hcd_to_c67x00_hcd(hcd);
> +
> + spin_lock_init(&c67x00->lock);
> + c67x00->sie = sie;
> +
> + INIT_LIST_HEAD(&c67x00->list[PIPE_ISOCHRONOUS]);
> + INIT_LIST_HEAD(&c67x00->list[PIPE_INTERRUPT]);
> + INIT_LIST_HEAD(&c67x00->list[PIPE_CONTROL]);
> + INIT_LIST_HEAD(&c67x00->list[PIPE_BULK]);
> + c67x00->urb_count = 0;
> + INIT_LIST_HEAD(&c67x00->td_list);
> + c67x00->td_base_addr = CY_HCD_BUF_ADDR + SIE_TD_OFFSET(sie->sie_num);
> + c67x00->buf_base_addr = CY_HCD_BUF_ADDR + SIE_BUF_OFFSET(sie->sie_num);
> + c67x00->max_frame_bw = MAX_FRAME_BW_STD;
> +
> + c67x00_ll_husb_init_host_port(sie);
> +
> + init_completion(&c67x00->endpoint_disable);
> + retval = c67x00_sched_start_scheduler(c67x00);
> + if (retval)
> + goto err1;
> +
> + retval = usb_add_hcd(hcd, 0, 0);
> + if (retval) {
> + dev_dbg(sie_dev(sie), "%s: usb_add_hcd returned %d\n",
> + __func__, retval);
> + goto err2;
> + }
> +
> + spin_lock_irqsave(&sie->lock, flags);
> + sie->private_data = c67x00;
> + sie->irq = c67x00_hcd_irq;
> + spin_unlock_irqrestore(&sie->lock, flags);
> +
> + return retval;
> +
> + err2:
> + c67x00_sched_stop_scheduler(c67x00);
> + err1:
> + usb_put_hcd(hcd);
> + err0:
> + return retval;
> +}
> +
> +/* may be called with controller, bus, and devices active */
> +void c67x00_hcd_remove(struct c67x00_sie *sie)
> +{
> + struct c67x00_hcd *c67x00 = sie->private_data;
> + struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
> +
> + c67x00_sched_stop_scheduler(c67x00);
> + usb_remove_hcd(hcd);
> + usb_put_hcd(hcd);
> +}
> Index: linux-2.6/drivers/usb/c67x00/c67x00-hcd.h
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/usb/c67x00/c67x00-hcd.h
> @@ -0,0 +1,133 @@
> +/*
> + * c67x00-hcd.h: Cypress C67X00 USB HCD
> + *
> + * Copyright (C) 2006-2008 Barco N.V.
> + * Derived from the Cypress cy7c67200/300 ezusb linux driver and
> + * based on multiple host controller drivers inside the linux kernel.
> + *
> + * This program 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 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program 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 this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA.
> + */
> +
> +#ifndef _USB_C67X00_HCD_H
> +#define _USB_C67X00_HCD_H
> +
> +#include <linux/kernel.h>
> +#include <linux/spinlock.h>
> +#include <linux/list.h>
> +#include <linux/usb.h>
> +#include "../core/hcd.h"
> +#include "c67x00.h"
> +
> +/*
> + * The following parameters depend on the CPU speed, bus speed, ...
> + * These can be tuned for specific use cases, e.g. if isochronous transfers
> + * are very important, bandwith can be sacrificed to guarantee that the
> + * 1ms deadline will be met.
> + * If bulk transfers are important, the MAX_FRAME_BW can be increased,
> + * but some (or many) isochronous deadlines might not be met.
> + *
> + * The values are specified in bittime.
> + */
> +
> +/*
> + * The current implementation switches between _STD (default) and _ISO (when
> + * isochronous transfers are scheduled), in order to optimize the throughput
> + * in normal cicrumstances, but also provide good isochronous behaviour.
> + *
> + * Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
> + * frames; there are 12000 bit times per frame.
> + */
> +
> +#define TOTAL_FRAME_BW 12000
> +#define DEFAULT_EOT 2250
> +
> +#define MAX_FRAME_BW_STD (TOTAL_FRAME_BW - DEFAULT_EOT)
> +#define MAX_FRAME_BW_ISO 2400
> +
> +/*
> + * Periodic transfers may only use 90% of the full frame, but as
> + * we currently don't even use 90% of the full frame, we may
> + * use the full usable time for periodic transfers.
> + */
> +#define MAX_PERIODIC_BW(full_bw) full_bw
> +
> +/* -------------------------------------------------------------------------- */
> +
> +struct c67x00_hcd {
> + spinlock_t lock;
> + struct c67x00_sie *sie;
> + unsigned int low_speed_ports; /* bitmask of low speed ports */
> + unsigned int urb_count;
> + unsigned int urb_iso_count;
> +
> + struct list_head list[4]; /* iso, int, ctrl, bulk */
> +#if PIPE_BULK != 3
> +#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
> +#endif
> +
> + /* USB bandwidth allocated to td_list */
> + int bandwidth_allocated;
> + /* USB bandwidth allocated for isoc/int transfer */
> + int periodic_bw_allocated;
> + struct list_head td_list;
> + int max_frame_bw;
> +
> + u16 td_base_addr;
> + u16 buf_base_addr;
> + u16 next_td_addr;
> + u16 next_buf_addr;
> +
> + struct tasklet_struct tasklet;
> +
> + struct completion endpoint_disable;
> +
> + u16 current_frame;
> + u16 last_frame;
> +};
> +
> +static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
> +{
> + return (struct c67x00_hcd *)(hcd->hcd_priv);
> +}
> +
> +static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
> +{
> + return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
> +}
> +
> +/* ---------------------------------------------------------------------
> + * Functions used by c67x00-drv
> + */
> +
> +int c67x00_hcd_probe(struct c67x00_sie *sie);
> +void c67x00_hcd_remove(struct c67x00_sie *sie);
> +
> +/* ---------------------------------------------------------------------
> + * Transfer Descriptor scheduling functions
> + */
> +int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
> +int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
> +void c67x00_endpoint_disable(struct usb_hcd *hcd,
> + struct usb_host_endpoint *ep);
> +
> +void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
> +void c67x00_sched_kick(struct c67x00_hcd *c67x00);
> +int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
> +void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
> +
> +#define c67x00_hcd_dev(x) (c67x00_hcd_to_hcd(x)->self.controller)
> +
> +#endif /* _USB_C67X00_HCD_H */
> Index: linux-2.6/drivers/usb/c67x00/c67x00-sched.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/usb/c67x00/c67x00-sched.c
> @@ -0,0 +1,1170 @@
> +/*
> + * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
> + *
> + * Copyright (C) 2006-2008 Barco N.V.
> + * Derived from the Cypress cy7c67200/300 ezusb linux driver and
> + * based on multiple host controller drivers inside the linux kernel.
> + *
> + * This program 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 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program 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 this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA.
> + */
> +
> +#include <linux/kthread.h>
> +
> +#include "c67x00.h"
> +#include "c67x00-hcd.h"
> +
> +/*
> + * These are the stages for a control urb, they are kept
> + * in both urb->interval and td->privdata.
> + */
> +#define SETUP_STAGE 0
> +#define DATA_STAGE 1
> +#define STATUS_STAGE 2
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * struct c67x00_ep_data: Host endpoint data structure
> + */
> +struct c67x00_ep_data {
> + struct list_head queue;
> + struct list_head node;
> + struct usb_host_endpoint *hep;
> + struct usb_device *dev;
> + u16 next_frame; /* For int/isoc transactions */
> +};
> +
> +/**
> + * struct c67x00_td
> + *
> + * Hardware parts are little endiannes, SW in CPU endianess.
> + */
> +struct c67x00_td {
> + /* HW specific part */
> + __le16 ly_base_addr; /* Bytes 0-1 */
> + __le16 port_length; /* Bytes 2-3 */
> + u8 pid_ep; /* Byte 4 */
> + u8 dev_addr; /* Byte 5 */
> + u8 ctrl_reg; /* Byte 6 */
> + u8 status; /* Byte 7 */
> + u8 retry_cnt; /* Byte 8 */
> +#define TT_OFFSET 2
> +#define TT_CONTROL 0
> +#define TT_ISOCHRONOUS 1
> +#define TT_BULK 2
> +#define TT_INTERRUPT 3
> + u8 residue; /* Byte 9 */
> + __le16 next_td_addr; /* Bytes 10-11 */
> + /* SW part */
> + struct list_head td_list;
> + u16 td_addr;
> + void *data;
> + struct urb *urb;
> + unsigned long privdata;
> +
> + /* These are needed for handling the toggle bits:
> + * an urb can be dequeued while a td is in progress
> + * after checking the td, the toggle bit might need to
> + * be fixed */
> + struct c67x00_ep_data *ep_data;
> + unsigned int pipe;
> +};
> +
> +struct c67x00_urb_priv {
> + struct list_head hep_node;
> + struct urb *urb;
> + int port;
> + int cnt; /* packet number for isoc */
> + int status;
> + struct c67x00_ep_data *ep_data;
> +};
> +
> +#define td_udev(td) ((td)->ep_data->dev)
> +
> +#define CY_TD_SIZE 12
> +
> +#define TD_PIDEP_OFFSET 0x04
> +#define TD_PIDEPMASK_PID 0xF0
> +#define TD_PIDEPMASK_EP 0x0F
> +#define TD_PORTLENMASK_DL 0x02FF
> +#define TD_PORTLENMASK_PN 0xC000
> +
> +#define TD_STATUS_OFFSET 0x07
> +#define TD_STATUSMASK_ACK 0x01
> +#define TD_STATUSMASK_ERR 0x02
> +#define TD_STATUSMASK_TMOUT 0x04
> +#define TD_STATUSMASK_SEQ 0x08
> +#define TD_STATUSMASK_SETUP 0x10
> +#define TD_STATUSMASK_OVF 0x20
> +#define TD_STATUSMASK_NAK 0x40
> +#define TD_STATUSMASK_STALL 0x80
> +
> +#define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \
> + TD_STATUSMASK_STALL)
> +
> +#define TD_RETRYCNT_OFFSET 0x08
> +#define TD_RETRYCNTMASK_ACT_FLG 0x10
> +#define TD_RETRYCNTMASK_TX_TYPE 0x0C
> +#define TD_RETRYCNTMASK_RTY_CNT 0x03
> +
> +#define TD_RESIDUE_OVERFLOW 0x80
> +
> +#define TD_PID_IN 0x90
> +
> +/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */
> +#define td_residue(td) ((__s8)(td->residue))
> +#define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr))
> +#define td_port_length(td) (__le16_to_cpu((td)->port_length))
> +#define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr))
> +
> +#define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG)
> +#define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL)
> +
> +#define td_sequence_ok(td) (!td->status || \
> + (!(td->status & TD_STATUSMASK_SEQ) == \
> + !(td->ctrl_reg & SEQ_SEL)))
> +
> +#define td_acked(td) (!td->status || \
> + (td->status & TD_STATUSMASK_ACK))
> +#define td_actual_bytes(td) (td_length(td) - td_residue(td))
> +
> +/* -------------------------------------------------------------------------- */
> +
> +#ifdef DEBUG
> +
> +/**
> + * dbg_td - Dump the contents of the TD
> + */
> +static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg)
> +{
> + struct device *dev = c67x00_hcd_dev(c67x00);
> +
> + dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr);
> + dev_dbg(dev, "urb: 0x%p\n", td->urb);
> + dev_dbg(dev, "endpoint: %4d\n", usb_pipeendpoint(td->pipe));
> + dev_dbg(dev, "pipeout: %4d\n", usb_pipeout(td->pipe));
> + dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td));
> + dev_dbg(dev, "port_length: 0x%04x\n", td_port_length(td));
> + dev_dbg(dev, "pid_ep: 0x%02x\n", td->pid_ep);
> + dev_dbg(dev, "dev_addr: 0x%02x\n", td->dev_addr);
> + dev_dbg(dev, "ctrl_reg: 0x%02x\n", td->ctrl_reg);
> + dev_dbg(dev, "status: 0x%02x\n", td->status);
> + dev_dbg(dev, "retry_cnt: 0x%02x\n", td->retry_cnt);
> + dev_dbg(dev, "residue: 0x%02x\n", td->residue);
> + dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td));
> + dev_dbg(dev, "data:");
> + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 1,
> + td->data, td_length(td), 1);
> +}
> +#else /* DEBUG */
> +
> +static inline void
> +dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { }
> +
> +#endif /* DEBUG */
> +
> +/* -------------------------------------------------------------------------- */
> +/* Helper functions */
> +
> +static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00)
> +{
> + return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK;
> +}
> +
> +/**
> + * frame_add
> + * Software wraparound for framenumbers.
> + */
> +static inline u16 frame_add(u16 a, u16 b)
> +{
> + return (a + b) & HOST_FRAME_MASK;
> +}
> +
> +/**
> + * frame_after - is frame a after frame b
> + */
> +static inline int frame_after(u16 a, u16 b)
> +{
> + return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) <
> + (HOST_FRAME_MASK / 2);
> +}
> +
> +/**
> + * frame_after_eq - is frame a after or equal to frame b
> + */
> +static inline int frame_after_eq(u16 a, u16 b)
> +{
> + return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) <
> + (HOST_FRAME_MASK / 2);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * c67x00_release_urb - remove link from all tds to this urb
> + * Disconnects the urb from it's tds, so that it can be given back.
> + * pre: urb->hcpriv != NULL
> + */
> +static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + struct c67x00_td *td;
> + struct c67x00_urb_priv *urbp;
> +
> + BUG_ON(!urb);
> +
> + c67x00->urb_count--;
> +
> + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
> + c67x00->urb_iso_count--;
> + if (c67x00->urb_iso_count == 0)
> + c67x00->max_frame_bw = MAX_FRAME_BW_STD;
> + }
> +
> + /* TODO this might be not so efficient when we've got many urbs!
> + * Alternatives:
> + * * only clear when needed
> + * * keep a list of tds with each urbp
> + */
> + list_for_each_entry(td, &c67x00->td_list, td_list)
> + if (urb == td->urb)
> + td->urb = NULL;
> +
> + urbp = urb->hcpriv;
> + urb->hcpriv = NULL;
> + list_del(&urbp->hep_node);
> + kfree(urbp);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static struct c67x00_ep_data *
> +c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + struct usb_host_endpoint *hep = urb->ep;
> + struct c67x00_ep_data *ep_data;
> + int type;
> +
> + c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
> +
> + /* Check if endpoint already has a c67x00_ep_data struct allocated */
> + if (hep->hcpriv) {
> + ep_data = hep->hcpriv;
> + if (frame_after(c67x00->current_frame, ep_data->next_frame))
> + ep_data->next_frame =
> + frame_add(c67x00->current_frame, 1);
> + return hep->hcpriv;
> + }
> +
> + /* Allocate and initialize a new c67x00 endpoint data structure */
> + ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC);
> + if (!ep_data)
> + return NULL;
> +
> + INIT_LIST_HEAD(&ep_data->queue);
> + INIT_LIST_HEAD(&ep_data->node);
> + ep_data->hep = hep;
> +
> + /* hold a reference to udev as long as this endpoint lives,
> + * this is needed to possibly fix the data toggle */
> + ep_data->dev = usb_get_dev(urb->dev);
> + hep->hcpriv = ep_data;
> +
> + /* For ISOC and INT endpoints, start ASAP: */
> + ep_data->next_frame = frame_add(c67x00->current_frame, 1);
> +
> + /* Add the endpoint data to one of the pipe lists; must be added
> + in order of endpoint address */
> + type = usb_pipetype(urb->pipe);
> + if (list_empty(&ep_data->node)) {
> + list_add(&ep_data->node, &c67x00->list[type]);
> + } else {
> + struct c67x00_ep_data *prev;
> +
> + list_for_each_entry(prev, &c67x00->list[type], node) {
> + if (prev->hep->desc.bEndpointAddress >
> + hep->desc.bEndpointAddress) {
> + list_add(&ep_data->node, prev->node.prev);
> + break;
> + }
> + }
> + }
> +
> + return ep_data;
> +}
> +
> +static int c67x00_ep_data_free(struct usb_host_endpoint *hep)
> +{
> + struct c67x00_ep_data *ep_data = hep->hcpriv;
> +
> + if (!ep_data)
> + return 0;
> +
> + if (!list_empty(&ep_data->queue))
> + return -EBUSY;
> +
> + usb_put_dev(ep_data->dev);
> + list_del(&ep_data->queue);
> + list_del(&ep_data->node);
> +
> + kfree(ep_data);
> + hep->hcpriv = NULL;
> +
> + return 0;
> +}
> +
> +void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
> +{
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + unsigned long flags;
> +
> + if (!list_empty(&ep->urb_list))
> + dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n");
> +
> + spin_lock_irqsave(&c67x00->lock, flags);
> +
> + /* loop waiting for all transfers in the endpoint queue to complete */
> + while (c67x00_ep_data_free(ep)) {
> + /* Drop the lock so we can sleep waiting for the hardware */
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +
> + /* it could happen that we reinitialize this completion, while
> + * somebody was waiting for that completion. The timeout and
> + * while loop handle such cases, but this might be improved */
> + INIT_COMPLETION(c67x00->endpoint_disable);
> + c67x00_sched_kick(c67x00);
> + wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ);
> +
> + spin_lock_irqsave(&c67x00->lock, flags);
> + }
> +
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static inline int get_root_port(struct usb_device *dev)
> +{
> + while (dev->parent->parent)
> + dev = dev->parent;
> + return dev->portnum;
> +}
> +
> +int c67x00_urb_enqueue(struct usb_hcd *hcd,
> + struct urb *urb, gfp_t mem_flags)
> +{
> + int ret;
> + unsigned long flags;
> + struct c67x00_urb_priv *urbp;
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + int port = get_root_port(urb->dev)-1;
> +
> + spin_lock_irqsave(&c67x00->lock, flags);
> +
> + /* Make sure host controller is running */
> + if (!HC_IS_RUNNING(hcd->state)) {
> + ret = -ENODEV;
> + goto err_not_linked;
> + }
> +
> + ret = usb_hcd_link_urb_to_ep(hcd, urb);
> + if (ret)
> + goto err_not_linked;
> +
> + /* Allocate and initialize urb private data */
> + urbp = kzalloc(sizeof(*urbp), mem_flags);
> + if (!urbp) {
> + ret = -ENOMEM;
> + goto err_urbp;
> + }
> +
> + INIT_LIST_HEAD(&urbp->hep_node);
> + urbp->urb = urb;
> + urbp->port = port;
> +
> + urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb);
> +
> + if (!urbp->ep_data) {
> + ret = -ENOMEM;
> + goto err_epdata;
> + }
> +
> + /* TODO claim bandwidth with usb_claim_bandwidth?
> + * also release it somewhere! */
> +
> + urb->hcpriv = urbp;
> +
> + urb->actual_length = 0; /* Nothing received/transmitted yet */
> +
> + switch (usb_pipetype(urb->pipe)) {
> + case PIPE_CONTROL:
> + urb->interval = SETUP_STAGE;
> + break;
> + case PIPE_INTERRUPT:
> + break;
> + case PIPE_BULK:
> + break;
> + case PIPE_ISOCHRONOUS:
> + if (c67x00->urb_iso_count == 0)
> + c67x00->max_frame_bw = MAX_FRAME_BW_ISO;
> + c67x00->urb_iso_count++;
> + /* Assume always URB_ISO_ASAP, FIXME */
> + if (list_empty(&urbp->ep_data->queue))
> + urb->start_frame = urbp->ep_data->next_frame;
> + else {
> + /* Go right after the last one */
> + struct urb *last_urb;
> +
> + last_urb = list_entry(urbp->ep_data->queue.prev,
> + struct c67x00_urb_priv,
> + hep_node)->urb;
> + urb->start_frame =
> + frame_add(last_urb->start_frame,
> + last_urb->number_of_packets *
> + last_urb->interval);
> + }
> + urbp->cnt = 0;
> + break;
> + }
> +
> + /* Add the URB to the endpoint queue */
> + list_add_tail(&urbp->hep_node, &urbp->ep_data->queue);
> +
> + /* If this is the only URB, kick start the controller */
> + if (!c67x00->urb_count++)
> + c67x00_ll_hpi_enable_sofeop(c67x00->sie);
> +
> + c67x00_sched_kick(c67x00);
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +
> + return 0;
> +
> +err_epdata:
> + kfree(urbp);
> +err_urbp:
> + usb_hcd_unlink_urb_from_ep(hcd, urb);
> +err_not_linked:
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +
> + return ret;
> +}
> +
> +int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
> +{
> + struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
> + unsigned long flags;
> + int rc;
> +
> + spin_lock_irqsave(&c67x00->lock, flags);
> + rc = usb_hcd_check_unlink_urb(hcd, urb, status);
> + if (rc)
> + goto done;
> +
> + c67x00_release_urb(c67x00, urb);
> + usb_hcd_unlink_urb_from_ep(hcd, urb);
> +
> + spin_unlock(&c67x00->lock);
> + usb_hcd_giveback_urb(hcd, urb, status);
> + spin_lock(&c67x00->lock);
> +
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> +
> + return 0;
> +
> + done:
> + spin_unlock_irqrestore(&c67x00->lock, flags);
> + return rc;
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/*
> + * pre: c67x00 locked, urb unlocked
> + */
> +static void
> +c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
> +{
> + struct c67x00_urb_priv *urbp;
> +
> + if (!urb)
> + return;
> +
> + urbp = urb->hcpriv;
> + urbp->status = status;
> +
> + list_del_init(&urbp->hep_node);
> +
> + c67x00_release_urb(c67x00, urb);
> + usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
> + spin_unlock(&c67x00->lock);
> + usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, urbp->status);
> + spin_lock(&c67x00->lock);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb,
> + int len, int periodic)
> +{
> + struct c67x00_urb_priv *urbp = urb->hcpriv;
> + int bit_time;
> +
> + /* According to the C67x00 BIOS user manual, page 3-18,19, the
> + * following calculations provide the full speed bit times for
> + * a transaction.
> + *
> + * FS(in) = 112.5 + 9.36*BC + HOST_DELAY
> + * FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY
> + * FS(out) = 112.5 + 9.36*BC + HOST_DELAY
> + * FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY
> + * LS(in) = 802.4 + 75.78*BC + HOST_DELAY
> + * LS(out) = 802.6 + 74.67*BC + HOST_DELAY
> + *
> + * HOST_DELAY == 106 for the c67200 and c67300.
> + */
> +
> + /* make calculations in 1/100 bit times to maintain resolution */
> + if (urbp->ep_data->dev->speed == USB_SPEED_LOW) {
> + /* Low speed pipe */
> + if (usb_pipein(urb->pipe))
> + bit_time = 80240 + 7578*len;
> + else
> + bit_time = 80260 + 7467*len;
> + } else {
> + /* FS pipes */
> + if (usb_pipeisoc(urb->pipe))
> + bit_time = usb_pipein(urb->pipe) ? 9050 : 7840;
> + else
> + bit_time = 11250;
> + bit_time += 936*len;
> + }
> +
> + /* Scale back down to integer bit times. Use a host delay of 106.
> + * (this is the only place it is used) */
> + bit_time = ((bit_time+50) / 100) + 106;
> +
> + if (unlikely(bit_time + c67x00->bandwidth_allocated >=
> + c67x00->max_frame_bw))
> + return -EMSGSIZE;
> +
> + if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >=
> + c67x00->td_base_addr + SIE_TD_SIZE))
> + return -EMSGSIZE;
> +
> + if (unlikely(c67x00->next_buf_addr + len >=
> + c67x00->buf_base_addr + SIE_TD_BUF_SIZE))
> + return -EMSGSIZE;
> +
> + if (periodic) {
> + if (unlikely(bit_time + c67x00->periodic_bw_allocated >=
> + MAX_PERIODIC_BW(c67x00->max_frame_bw)))
> + return -EMSGSIZE;
> + c67x00->periodic_bw_allocated += bit_time;
> + }
> +
> + c67x00->bandwidth_allocated += bit_time;
> + return 0;
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * td_addr and buf_addr must be word aligned
> + */
> +static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb,
> + void *data, int len, int pid, int toggle,
> + unsigned long privdata)
> +{
> + struct c67x00_td *td;
> + struct c67x00_urb_priv *urbp = urb->hcpriv;
> + const __u8 active_flag = 1, retry_cnt = 1;
> + __u8 cmd = 0;
> + int tt = 0;
> +
> + if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe)
> + || usb_pipeint(urb->pipe)))
> + return -EMSGSIZE; /* Not really an error, but expected */
> +
> + td = kzalloc(sizeof(*td), GFP_ATOMIC);
> + if (!td)
> + return -ENOMEM;
> +
> + td->pipe = urb->pipe;
> + td->ep_data = urbp->ep_data;
> +
> + if ((td_udev(td)->speed == USB_SPEED_LOW) &&
> + !(c67x00->low_speed_ports & (1 << urbp->port)))
> + cmd |= PREAMBLE_EN;
> +
> + switch (usb_pipetype(td->pipe)) {
> + case PIPE_ISOCHRONOUS:
> + tt = TT_ISOCHRONOUS;
> + cmd |= ISO_EN;
> + break;
> + case PIPE_CONTROL:
> + tt = TT_CONTROL;
> + break;
> + case PIPE_BULK:
> + tt = TT_BULK;
> + break;
> + case PIPE_INTERRUPT:
> + tt = TT_INTERRUPT;
> + break;
> + }
> +
> + if (toggle)
> + cmd |= SEQ_SEL;
> +
> + cmd |= ARM_EN;
> +
> + /* SW part */
> + td->td_addr = c67x00->next_td_addr;
> + c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE;
> +
> + /* HW part */
> + td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr);
> + td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) |
> + (urbp->port << 14) | (len & 0x3FF));
> + td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) |
> + (usb_pipeendpoint(td->pipe) & 0xF);
> + td->dev_addr = usb_pipedevice(td->pipe) & 0x7F;
> + td->ctrl_reg = cmd;
> + td->status = 0;
> + td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt;
> + td->residue = 0;
> + td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr);
> +
> + /* SW part */
> + td->data = data;
> + td->urb = urb;
> + td->privdata = privdata;
> +
> + c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */
> +
> + list_add_tail(&td->td_list, &c67x00->td_list);
> + return 0;
> +}
> +
> +static inline void c67x00_release_td(struct c67x00_td *td)
> +{
> + list_del_init(&td->td_list);
> + kfree(td);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + int remaining;
> + int toggle;
> + int pid;
> + int ret = 0;
> + int maxps;
> + int need_empty;
> +
> + toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
> + usb_pipeout(urb->pipe));
> + remaining = urb->transfer_buffer_length - urb->actual_length;
> +
> + maxps = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
> +
> + need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
> + usb_pipeout(urb->pipe) && !(remaining % maxps);
> +
> + while (remaining || need_empty) {
> + int len;
> + char *td_buf;
> +
> + len = (remaining > maxps) ? maxps : remaining;
> + if (!len)
> + need_empty = 0;
> +
> + pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
> + td_buf = urb->transfer_buffer + urb->transfer_buffer_length -
> + remaining;
> + ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle,
> + DATA_STAGE);
> + if (ret)
> + return ret; /* td wasn't created */
> +
> + toggle ^= 1;
> + remaining -= len;
> + if (usb_pipecontrol(urb->pipe))
> + break;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * return 0 in case more bandwidth is available, else errorcode
> + */
> +static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + int ret;
> + int pid;
> +
> + switch (urb->interval) {
> + default:
> + case SETUP_STAGE:
> + ret = c67x00_create_td(c67x00, urb, urb->setup_packet,
> + 8, USB_PID_SETUP, 0, SETUP_STAGE);
> + if (ret)
> + return ret;
> + urb->interval = SETUP_STAGE;
> + usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
> + usb_pipeout(urb->pipe), 1);
> + break;
> + case DATA_STAGE:
> + if (urb->transfer_buffer_length) {
> + ret = c67x00_add_data_urb(c67x00, urb);
> + if (ret)
> + return ret;
> + break;
> + } /* else fallthrough */
> + case STATUS_STAGE:
> + pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
> + ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1,
> + STATUS_STAGE);
> + if (ret)
> + return ret;
> + break;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * return 0 in case more bandwidth is available, else errorcode
> + */
> +static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + struct c67x00_urb_priv *urbp = urb->hcpriv;
> +
> + if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
> + urbp->ep_data->next_frame =
> + frame_add(urbp->ep_data->next_frame, urb->interval);
> + return c67x00_add_data_urb(c67x00, urb);
> + }
> + return 0;
> +}
> +
> +static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb)
> +{
> + struct c67x00_urb_priv *urbp = urb->hcpriv;
> +
> + if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
> + char *td_buf;
> + int len, pid, ret;
> +
> + BUG_ON(urbp->cnt >= urb->number_of_packets);
> +
> + td_buf = urb->transfer_buffer +
> + urb->iso_frame_desc[urbp->cnt].offset;
> + len = urb->iso_frame_desc[urbp->cnt].length;
> + pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
> +
> + ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0,
> + urbp->cnt);
> + if (ret) {
> + printk(KERN_DEBUG "create failed: %d\n", ret);
> + urb->iso_frame_desc[urbp->cnt].actual_length = 0;
> + urb->iso_frame_desc[urbp->cnt].status = ret;
> + if (urbp->cnt + 1 == urb->number_of_packets)
> + c67x00_giveback_urb(c67x00, urb, 0);
> + }
> +
> + urbp->ep_data->next_frame =
> + frame_add(urbp->ep_data->next_frame, urb->interval);
> + urbp->cnt++;
> + }
> + return 0;
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type,
> + int (*add)(struct c67x00_hcd *, struct urb *))
> +{
> + struct c67x00_ep_data *ep_data;
> + struct urb *urb;
> +
> + /* traverse every endpoint on the list */
> + list_for_each_entry(ep_data, &c67x00->list[type], node) {
> + if (!list_empty(&ep_data->queue)) {
> + /* and add the first urb */
> + /* isochronous transfer rely on this */
> + urb = list_entry(ep_data->queue.next,
> + struct c67x00_urb_priv,
> + hep_node)->urb;
> + add(c67x00, urb);
> + }
> + }
> +}
> +
> +static void c67x00_fill_frame(struct c67x00_hcd *c67x00)
> +{
> + struct c67x00_td *td, *ttd;
> +
> + /* Check if we can proceed */
> + if (!list_empty(&c67x00->td_list)) {
> + dev_warn(c67x00_hcd_dev(c67x00),
> + "TD list not empty! This should not happen!\n");
> + list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) {
> + dbg_td(c67x00, td, "Unprocessed td");
> + c67x00_release_td(td);
> + }
> + }
> +
> + /* Reinitialize variables */
> + c67x00->bandwidth_allocated = 0;
> + c67x00->periodic_bw_allocated = 0;
> +
> + c67x00->next_td_addr = c67x00->td_base_addr;
> + c67x00->next_buf_addr = c67x00->buf_base_addr;
> +
> + /* Fill the list */
> + c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb);
> + c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb);
> + c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb);
> + c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * Get TD from C67X00
> + */
> +static inline void
> +c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
> +{
> + c67x00_ll_read_mem_le16(c67x00->sie->dev,
> + td->td_addr, td, CY_TD_SIZE);
> +
> + if (usb_pipein(td->pipe) && td_actual_bytes(td))
> + c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
> + td->data, td_actual_bytes(td));
> +}
> +
> +static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td)
> +{
> + if (td->status & TD_STATUSMASK_ERR) {
> + dbg_td(c67x00, td, "ERROR_FLAG");
> + return -EILSEQ;
> + }
> + if (td->status & TD_STATUSMASK_STALL) {
> + /* dbg_td(c67x00, td, "STALL"); */
> + return -EPIPE;
> + }
> + if (td->status & TD_STATUSMASK_TMOUT) {
> + dbg_td(c67x00, td, "TIMEOUT");
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +
> +static inline int c67x00_end_of_data(struct c67x00_td *td)
> +{
> + int maxps, need_empty, remaining;
> + struct urb *urb = td->urb;
> + int act_bytes;
> +
> + act_bytes = td_actual_bytes(td);
> +
> + if (unlikely(!act_bytes))
> + return 1; /* This was an empty packet */
> +
> + maxps = usb_maxpacket(td_udev(td), td->pipe, usb_pipeout(td->pipe));
> +
> + if (unlikely(act_bytes < maxps))
> + return 1; /* Smaller then full packet */
> +
> + remaining = urb->transfer_buffer_length - urb->actual_length;
> + need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
> + usb_pipeout(urb->pipe) && !(remaining % maxps);
> +
> + if (unlikely(!remaining && !need_empty))
> + return 1;
> +
> + return 0;
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/* Remove all td's from the list which come
> + * after last_td and are meant for the same pipe.
> + * This is used when a short packet has occured */
> +static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00,
> + struct c67x00_td *last_td)
> +{
> + struct c67x00_td *td, *tmp;
> + td = last_td;
> + tmp = last_td;
> + while (td->td_list.next != &c67x00->td_list) {
> + td = list_entry(td->td_list.next, struct c67x00_td, td_list);
> + if (td->pipe == last_td->pipe) {
> + c67x00_release_td(td);
> + td = tmp;
> + }
> + tmp = td;
> + }
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00,
> + struct c67x00_td *td)
> +{
> + struct urb *urb = td->urb;
> +
> + if (!urb)
> + return;
> +
> + urb->actual_length += td_actual_bytes(td);
> +
> + switch (usb_pipetype(td->pipe)) {
> + /* isochronous tds are handled separately */
> + case PIPE_CONTROL:
> + switch (td->privdata) {
> + case SETUP_STAGE:
> + urb->interval =
> + urb->transfer_buffer_length ?
> + DATA_STAGE : STATUS_STAGE;
> + /* Don't count setup_packet with normal data: */
> + urb->actual_length = 0;
> + break;
> +
> + case DATA_STAGE:
> + if (c67x00_end_of_data(td)) {
> + urb->interval = STATUS_STAGE;
> + c67x00_clear_pipe(c67x00, td);
> + }
> + break;
> +
> + case STATUS_STAGE:
> + urb->interval = 0;
> + c67x00_giveback_urb(c67x00, urb, 0);
> + break;
> + }
> + break;
> +
> + case PIPE_INTERRUPT:
> + case PIPE_BULK:
> + if (unlikely(c67x00_end_of_data(td))) {
> + c67x00_clear_pipe(c67x00, td);
> + c67x00_giveback_urb(c67x00, urb, 0);
> + }
> + break;
> + }
> +}
> +
> +static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td)
> +{
> + struct urb *urb = td->urb;
> + struct c67x00_urb_priv *urbp;
> + int cnt;
> +
> + if (!urb)
> + return;
> +
> + urbp = urb->hcpriv;
> + cnt = td->privdata;
> +
> + if (td->status & TD_ERROR_MASK)
> + urb->error_count++;
> +
> + urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td);
> + urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td);
> + if (cnt + 1 == urb->number_of_packets) /* Last packet */
> + c67x00_giveback_urb(c67x00, urb, 0);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * c67x00_check_td_list - handle tds which have been processed by the c67x00
> + * pre: current_td == 0
> + */
> +static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00)
> +{
> + struct c67x00_td *td, *tmp;
> + struct urb *urb;
> + int ack_ok;
> + int clear_endpoint;
> +
> + list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) {
> + /* get the TD */
> + c67x00_parse_td(c67x00, td);
> + urb = td->urb; /* urb can be NULL! */
> + ack_ok = 0;
> + clear_endpoint = 1;
> +
> + /* Handle isochronous transfers separately */
> + if (usb_pipeisoc(td->pipe)) {
> + clear_endpoint = 0;
> + c67x00_handle_isoc(c67x00, td);
> + goto cont;
> + }
> +
> + /* When an error occurs, all td's for that pipe go into an
> + * inactive state. This state matches successful transfers so
> + * we must make sure not to service them. */
> + if (td->status & TD_ERROR_MASK) {
> + c67x00_giveback_urb(c67x00, urb,
> + c67x00_td_to_error(c67x00, td));
> + goto cont;
> + }
> +
> + if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) ||
> + !td_acked(td))
> + goto cont;
> +
> + /* Sequence ok and acked, don't need to fix toggle */
> + ack_ok = 1;
> +
> + if (unlikely(td->status & TD_STATUSMASK_OVF)) {
> + if (td_residue(td) & TD_RESIDUE_OVERFLOW) {
> + /* Overflow */
> + c67x00_giveback_urb(c67x00, urb, -EOVERFLOW);
> + goto cont;
> + }
> + }
> +
> + clear_endpoint = 0;
> + c67x00_handle_successful_td(c67x00, td);
> +
> +cont:
> + if (clear_endpoint)
> + c67x00_clear_pipe(c67x00, td);
> + if (ack_ok)
> + usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe),
> + usb_pipeout(td->pipe),
> + !(td->ctrl_reg & SEQ_SEL));
> + /* next in list could have been removed, due to clear_pipe! */
> + tmp = list_entry(td->td_list.next, typeof(*td), td_list);
> + c67x00_release_td(td);
> + }
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00)
> +{
> + /* If all tds are processed, we can check the previous frame (if
> + * there was any) and start our next frame.
> + */
> + return !c67x00_ll_husb_get_current_td(c67x00->sie);
> +}
> +
> +/**
> + * Send td to C67X00
> + */
> +static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
> +{
> + int len = td_length(td);
> +
> + if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN))
> + c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
> + td->data, len);
> +
> + c67x00_ll_write_mem_le16(c67x00->sie->dev,
> + td->td_addr, td, CY_TD_SIZE);
> +}
> +
> +static void c67x00_send_frame(struct c67x00_hcd *c67x00)
> +{
> + struct c67x00_td *td;
> +
> + if (list_empty(&c67x00->td_list))
> + dev_warn(c67x00_hcd_dev(c67x00),
> + "%s: td list should not be empty here!\n",
> + __func__);
> +
> + list_for_each_entry(td, &c67x00->td_list, td_list) {
> + if (td->td_list.next == &c67x00->td_list)
> + td->next_td_addr = 0; /* Last td in list */
> +
> + c67x00_send_td(c67x00, td);
> + }
> +
> + c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +/**
> + * c67x00_do_work - Schedulers state machine
> + */
> +static void c67x00_do_work(struct c67x00_hcd *c67x00)
> +{
> + spin_lock(&c67x00->lock);
> + /* Make sure all tds are processed */
> + if (!c67x00_all_tds_processed(c67x00))
> + goto out;
> +
> + c67x00_check_td_list(c67x00);
> +
> + /* no td's are being processed (current == 0)
> + * and all have been "checked" */
> + complete(&c67x00->endpoint_disable);
> +
> + if (!list_empty(&c67x00->td_list))
> + goto out;
> +
> + c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
> + if (c67x00->current_frame == c67x00->last_frame)
> + goto out; /* Don't send tds in same frame */
> + c67x00->last_frame = c67x00->current_frame;
> +
> + /* If no urbs are scheduled, our work is done */
> + if (!c67x00->urb_count) {
> + c67x00_ll_hpi_disable_sofeop(c67x00->sie);
> + goto out;
> + }
> +
> + c67x00_fill_frame(c67x00);
> + if (!list_empty(&c67x00->td_list))
> + /* TD's have been added to the frame */
> + c67x00_send_frame(c67x00);
> +
> + out:
> + spin_unlock(&c67x00->lock);
> +}
> +
> +/* -------------------------------------------------------------------------- */
> +
> +static void c67x00_sched_tasklet(unsigned long __c67x00)
> +{
> + struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
> + c67x00_do_work(c67x00);
> +}
> +
> +void c67x00_sched_kick(struct c67x00_hcd *c67x00)
> +{
> + tasklet_hi_schedule(&c67x00->tasklet);
> +}
> +
> +int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
> +{
> + tasklet_init(&c67x00->tasklet, c67x00_sched_tasklet,
> + (unsigned long)c67x00);
> + return 0;
> +}
> +
> +void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
> +{
> + tasklet_kill(&c67x00->tasklet);
> +}
> Index: linux-2.6/drivers/usb/c67x00/Makefile
> ===================================================================
> --- /dev/null
> +++ linux-2.6/drivers/usb/c67x00/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# Makefile for Cypress C67X00 USB Controller
> +#
> +
> +ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG
> +
> +obj-$(CONFIG_USB_C67X00_HCD) += c67x00.o
> +
> +c67x00-objs := c67x00-drv.o c67x00-ll-hpi.o c67x00-hcd.o c67x00-sched.o
> Index: linux-2.6/drivers/usb/Makefile
> ===================================================================
> --- linux-2.6.orig/drivers/usb/Makefile
> +++ linux-2.6/drivers/usb/Makefile
> @@ -17,6 +17,8 @@
> obj-$(CONFIG_USB_U132_HCD) += host/
> obj-$(CONFIG_USB_R8A66597_HCD) += host/
>
> +obj-$(CONFIG_USB_C67X00_HCD) += c67x00/
> +
> obj-$(CONFIG_USB_ACM) += class/
> obj-$(CONFIG_USB_PRINTER) += class/
>
> Index: linux-2.6/drivers/usb/c67x00/c67x00-drv.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/c67x00/c67x00-drv.c
> +++ linux-2.6/drivers/usb/c67x00/c67x00-drv.c
> @@ -41,6 +41,7 @@
> #include <linux/usb/c67x00.h>
>
> #include "c67x00.h"
> +#include "c67x00-hcd.h"
>
> static void c67x00_probe_sie(struct c67x00_sie *sie,
> struct c67x00_device *dev, int sie_num)
> @@ -51,6 +52,10 @@
> sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
>
> switch (sie->mode) {
> + case C67X00_SIE_HOST:
> + c67x00_hcd_probe(sie);
> + break;
> +
> case C67X00_SIE_UNUSED:
> dev_info(sie_dev(sie),
> "Not using SIE %d as requested\n", sie->sie_num);
> @@ -66,6 +71,14 @@
>
> static void c67x00_remove_sie(struct c67x00_sie *sie)
> {
> + switch (sie->mode) {
> + case C67X00_SIE_HOST:
> + c67x00_hcd_remove(sie);
> + break;
> +
> + default:
> + break;
> + }
> }
>
> static irqreturn_t c67x00_irq(int irq, void *__dev)
> Index: linux-2.6/drivers/usb/c67x00/c67x00.h
> ===================================================================
> --- linux-2.6.orig/drivers/usb/c67x00/c67x00.h
> +++ linux-2.6/drivers/usb/c67x00/c67x00.h
> @@ -274,6 +274,15 @@
> void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
> void *data, int len);
>
> +/* Host specific functions */
> +void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value);
> +void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port);
> +void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr);
> +u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie);
> +u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie);
> +void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie);
> +void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port);
> +
> /* Called by c67x00_irq to handle lcp interrupts */
> void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status);
>
> Index: linux-2.6/drivers/usb/c67x00/c67x00-ll-hpi.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/c67x00/c67x00-ll-hpi.c
> +++ linux-2.6/drivers/usb/c67x00/c67x00-ll-hpi.c
> @@ -297,6 +297,81 @@
> }
>
> /* -------------------------------------------------------------------------- */
> +/* Host specific functions */
> +
> +void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
> +{
> + mutex_lock(&dev->hpi.lcp.mutex);
> + hpi_write_word(dev, HUSB_pEOT, value);
> + mutex_unlock(&dev->hpi.lcp.mutex);
> +}
> +
> +static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
> +{
> + struct c67x00_device *dev = sie->dev;
> + struct c67x00_lcp_int_data data;
> + int rc;
> +
> + rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
> + BUG_ON(rc); /* No return path for error code; crash spectacularly */
> +}
> +
> +void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
> +{
> + struct c67x00_device *dev = sie->dev;
> + struct c67x00_lcp_int_data data;
> + int rc;
> +
> + data.regs[0] = 50; /* Reset USB port for 50ms */
> + data.regs[1] = port | (sie->sie_num << 1);
> + rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
> + BUG_ON(rc); /* No return path for error code; crash spectacularly */
> +}
> +
> +void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
> +{
> + hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
> +}
> +
> +u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
> +{
> + return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
> +}
> +
> +u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
> +{
> + return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
> +}
> +
> +void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
> +{
> + /* Set port into host mode */
> + hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
> + c67x00_ll_husb_sie_init(sie);
> + /* Clear interrupts */
> + c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
> + /* Check */
> + if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
> + dev_warn(sie_dev(sie),
> + "SIE %d not set to host mode\n", sie->sie_num);
> +}
> +
> +void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
> +{
> + /* Clear connect change */
> + c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
> +
> + /* Enable interrupts */
> + hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
> + SOFEOP_TO_CPU_EN(sie->sie_num));
> + hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
> + SOF_EOP_IRQ_EN | DONE_IRQ_EN);
> +
> + /* Enable pull down transistors */
> + hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
> +}
> +
> +/* -------------------------------------------------------------------------- */
>
> void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
> {
> Index: linux-2.6/drivers/usb/host/Kconfig
> ===================================================================
> --- linux-2.6.orig/drivers/usb/host/Kconfig
> +++ linux-2.6/drivers/usb/host/Kconfig
> @@ -4,6 +4,19 @@
> comment "USB Host Controller Drivers"
> depends on USB
>
> +config USB_C67X00_HCD
> + tristate "Cypress C67x00 HCD support"
> + depends on USB
> + help
> + The Cypress C67x00 (EZ-Host/EZ-OTG) chips are dual-role
> + host/peripheral/OTG USB controllers.
> +
> + Enable this option to support this chip in host controller mode.
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called c67x00.
> +
> config USB_EHCI_HCD
> tristate "EHCI HCD (USB 2.0) support"
> depends on USB && USB_ARCH_HAS_EHCI
>
> --
> Bye, Peter Korsgaard
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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