[U-Boot] [PATCH v2 1/1] USB: EHCI: Initialize multiple USB controllers at once

[Marek Vasut <marex@denx.de>]

Dear Jim Lin,

> Add support for command line "usb reset" or "usb start" to initialize
> , "usb stop" to stop multiple USB controllers at once.
> Other command like "usb tree" also supports multiple controllers.
> 
> New added definitions in header file are:
> CONFIG_USB_MULTI
> CONFIG_USB_MAX_CONTROLLER_COUNT
> 
> Signed-off-by: Jim Lin <jilin@nvidia.com>
> ---
> Changes in v2:
> - Renaming from CONFIG_USB_INIT_MULTI to CONFIG_USB_MULTI
> - Define CONFIG_USB_MAX_CONTROLLER_COUNT as 1 if not defined
> - Remove volatile from structure ehci_ctrl of ehci-hcd.c for a
> checkpatch.pl warning
> 
>  common/cmd_usb.c            |   10 +++
>  common/usb.c                |   98 +++++++++++++++++++++++++-
>  common/usb_hub.c            |    4 +
>  drivers/usb/host/ehci-hcd.c |  167
> +++++++++++++++++++++++++++++++----------- drivers/usb/host/ehci.h     |  
>  5 ++
>  include/usb.h               |   12 +++
>  6 files changed, 251 insertions(+), 45 deletions(-)
> 
> diff --git a/common/cmd_usb.c b/common/cmd_usb.c
> index a8e3ae5..8d3093b 100644
> --- a/common/cmd_usb.c
> +++ b/common/cmd_usb.c
> @@ -554,7 +554,17 @@ int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char
> * const argv[]) }
>         if (strncmp(argv[1], "tree", 4) == 0) {
>                 printf("\nDevice Tree:\n");
> +#ifdef CONFIG_USB_MULTI

How's this supposed to work? Shouldn't this call usb_show_tree on roots of all 
the trees?

> +               for (i = 0; i < USB_MAX_DEVICE; i++) {
> +                       dev = usb_get_dev_index(i);
> +                       if (dev == NULL)
> +                               break;
> +                       if (dev->parent == NULL)
> +                               usb_show_tree(dev);
> +               }
> +#else
>                 usb_show_tree(usb_get_dev_index(0));
> +#endif
>                 return 0;
>         }
>         if (strncmp(argv[1], "inf", 3) == 0) {
> diff --git a/common/usb.c b/common/usb.c
> index 1b40228..065c70c 100644
> --- a/common/usb.c
> +++ b/common/usb.c
> @@ -77,6 +77,89 @@ static int asynch_allowed;
> 
>  char usb_started; /* flag for the started/stopped USB status */
> 
> +#ifdef CONFIG_USB_MULTI
> +/*************************************************************************
> ** + * Init USB Device
> + */
> +#ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
> +#define CONFIG_USB_MAX_CONTROLLER_COUNT 1
> +#endif
> +
> +int usb_init(void)
> +{
> +       void *ctrl;
> +       int i;
> +       struct usb_device *dev;
> +
> +       running = 0;
> +       dev_index = 0;
> +       asynch_allowed = 1;
> +       usb_hub_reset();
> +
> +       /* first make all devices unknown */
> +       for (i = 0; i < USB_MAX_DEVICE; i++) {
> +               memset(&usb_dev[i], 0, sizeof(struct usb_device));
> +               usb_dev[i].devnum = -1;
> +       }
> +
> +       /* init low_level USB */
> +       printf("USB:   ");
> +       for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
> +               /* init low_level USB */
> +               ctrl = usb_lowlevel_init(i);
> +               /*
> +                * if lowlevel init is OK, scan the bus for devices
> +                * i.e. search HUBs and configure them
> +                */
> +               if (ctrl) {
> +                       running = 1;
> +
> +                       printf("scanning bus for devices... ");
> +                       dev = usb_alloc_new_device(ctrl);
> +                       /*
> +                        * device 0 is always present
> +                        * (root hub, so let it analyze)
> +                        */
> +                       if (dev)
> +                               usb_new_device(dev);
> +               }
> +       }
> +
> +       if (running) {
> +               if (!dev_index)
> +                       printf("No USB Device found\n");
> +               else
> +                       printf("%d USB Device(s) found\n", dev_index);
> +#ifdef CONFIG_USB_KEYBOARD
> +       drv_usb_kbd_init();

Will the keyboard driver survive this?

> +#endif
> +       USB_PRINTF("scan end\n");
> +               usb_started = 1;
> +               return 0;
> +       } else {
> +               printf("Error, couldn't init Lowlevel part\n");
> +               usb_started = 0;
> +               return -1;
> +       }
> +}
> +
> +/*************************************************************************
> ***** + * Stop USB this stops the LowLevel Part and deregisters USB
> devices. + */
> +int usb_stop(void)
> +{
> +       int i;
> +
> +       if (usb_started) {
> +               asynch_allowed = 1;
> +               usb_started = 0;
> +               usb_hub_reset();
> +               for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++)
> +                       usb_lowlevel_stop(i);
> +       }
> +       return 0;
> +}
> +#else
>  /**********************************************************************
>   * some forward declerations...
>   */
> @@ -127,6 +210,7 @@ int usb_stop(void)
>         }
>         return res;
>  }
> +#endif
> 
>  /*
>   * disables the asynch behaviour of the control message. This is used for
> data @@ -750,11 +834,18 @@ struct usb_device *usb_get_dev_index(int index)
> return &usb_dev[index];
>  }
> 
> -
> +#ifdef CONFIG_USB_MULTI

I still believe it's possible to get rid of this MULTI crap, simply set the 
"multiness" to 1 for non-multi setups. How big overhead will that generate?
[...]
btw you might want to rebase on top of latest u-boot-usb.