target/linux/brcm2708/patches-3.18/0091-dwc_otg-FIQ-support-on-SMP.-Set-up-FIQ-stack-and-han.patch

   1 From e9898a39fce7db84ae56329d4f90da92af3bd584 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Wed, 24 Sep 2014 11:57:51 +0100
   4 Subject: [PATCH 091/114] dwc_otg: FIQ support on SMP. Set up FIQ stack and
   5  handler on Core 0 only.
   6
   7 ---
   8  drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 96 ++++++++++++++--------------
   9  1 file changed, 49 insertions(+), 47 deletions(-)
  10
  11 diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
  12 index 98e1dc5..4d8dd95 100644
  13 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
  14 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
  15 @@ -397,7 +397,55 @@ static struct fiq_handler fh = {
  16    .name = "usb_fiq",
  17  };
  18
  19 +static void hcd_init_fiq(void *cookie)
  20 +{
  21 +       dwc_otg_device_t *otg_dev = cookie;
  22 +       dwc_otg_hcd_t *dwc_otg_hcd = otg_dev->hcd;
  23 +       struct pt_regs regs;
  24 +
  25 +       if (claim_fiq(&fh)) {
  26 +               DWC_ERROR("Can't claim FIQ");
  27 +               BUG();
  28 +       }
  29 +       DWC_WARN("FIQ at 0x%08x", (fiq_fsm_enable ? (int)&dwc_otg_fiq_fsm : (int)&dwc_otg_fiq_nop));
  30 +       DWC_WARN("FIQ ASM at 0x%08x length %d", (int)&_dwc_otg_fiq_stub, (int)(&_dwc_otg_fiq_stub_end - &_dwc_otg_fiq_stub));
  31 +               set_fiq_handler((void *) &_dwc_otg_fiq_stub, &_dwc_otg_fiq_stub_end - &_dwc_otg_fiq_stub);
  32 +       memset(&regs,0,sizeof(regs));
  33 +
  34 +       regs.ARM_r8 = (long) dwc_otg_hcd->fiq_state;
  35 +       if (fiq_fsm_enable) {
  36 +               regs.ARM_r9 = dwc_otg_hcd->core_if->core_params->host_channels;
  37 +               //regs.ARM_r10 = dwc_otg_hcd->dma;
  38 +               regs.ARM_fp = (long) dwc_otg_fiq_fsm;
  39 +       } else {
  40 +               regs.ARM_fp = (long) dwc_otg_fiq_nop;
  41 +       }
  42
  43 +       regs.ARM_sp = (long) dwc_otg_hcd->fiq_stack + (sizeof(struct fiq_stack) - 4);
  44 +
  45 +//             __show_regs(&regs);
  46 +       set_fiq_regs(&regs);
  47 +
  48 +       //Set the mphi periph to  the required registers
  49 +       dwc_otg_hcd->fiq_state->mphi_regs.base    = otg_dev->os_dep.mphi_base;
  50 +       dwc_otg_hcd->fiq_state->mphi_regs.ctrl    = otg_dev->os_dep.mphi_base + 0x4c;
  51 +       dwc_otg_hcd->fiq_state->mphi_regs.outdda  = otg_dev->os_dep.mphi_base + 0x28;
  52 +       dwc_otg_hcd->fiq_state->mphi_regs.outddb  = otg_dev->os_dep.mphi_base + 0x2c;
  53 +       dwc_otg_hcd->fiq_state->mphi_regs.intstat = otg_dev->os_dep.mphi_base + 0x50;
  54 +       dwc_otg_hcd->fiq_state->dwc_regs_base = otg_dev->os_dep.base;
  55 +       DWC_WARN("MPHI regs_base at 0x%08x", (int)dwc_otg_hcd->fiq_state->mphi_regs.base);
  56 +       //Enable mphi peripheral
  57 +       writel((1<<31),dwc_otg_hcd->fiq_state->mphi_regs.ctrl);
  58 +#ifdef DEBUG
  59 +       if (readl(dwc_otg_hcd->fiq_state->mphi_regs.ctrl) & 0x80000000)
  60 +               DWC_WARN("MPHI periph has been enabled");
  61 +       else
  62 +               DWC_WARN("MPHI periph has NOT been enabled");
  63 +#endif
  64 +       // Enable FIQ interrupt from USB peripheral
  65 +       enable_fiq(INTERRUPT_VC_USB);
  66 +       local_fiq_enable();
  67 +}
  68
  69  /**
  70   * Initializes the HCD. This function allocates memory for and initializes the
  71 @@ -412,7 +460,6 @@ int hcd_init(dwc_bus_dev_t *_dev)
  72         dwc_otg_device_t *otg_dev = DWC_OTG_BUSDRVDATA(_dev);
  73         int retval = 0;
  74          u64 dmamask;
  75 -       struct pt_regs regs;
  76
  77         DWC_DEBUGPL(DBG_HCD, "DWC OTG HCD INIT otg_dev=%p\n", otg_dev);
  78
  79 @@ -464,52 +511,7 @@ int hcd_init(dwc_bus_dev_t *_dev)
  80         }
  81
  82         if (fiq_enable)
  83 -       {
  84 -               if (claim_fiq(&fh)) {
  85 -                       DWC_ERROR("Can't claim FIQ");
  86 -                       goto error2;
  87 -               }
  88 -
  89 -               DWC_WARN("FIQ at 0x%08x", (fiq_fsm_enable ? (int)&dwc_otg_fiq_fsm : (int)&dwc_otg_fiq_nop));
  90 -               DWC_WARN("FIQ ASM at 0x%08x length %d", (int)&_dwc_otg_fiq_stub, (int)(&_dwc_otg_fiq_stub_end - &_dwc_otg_fiq_stub));
  91 -
  92 -               set_fiq_handler((void *) &_dwc_otg_fiq_stub, &_dwc_otg_fiq_stub_end - &_dwc_otg_fiq_stub);
  93 -               memset(&regs,0,sizeof(regs));
  94 -
  95 -               regs.ARM_r8 = (long) dwc_otg_hcd->fiq_state;
  96 -               if (fiq_fsm_enable) {
  97 -                       regs.ARM_r9 = dwc_otg_hcd->core_if->core_params->host_channels;
  98 -                       //regs.ARM_r10 = dwc_otg_hcd->dma;
  99 -                       regs.ARM_fp = (long) dwc_otg_fiq_fsm;
 100 -               } else {
 101 -                       regs.ARM_fp = (long) dwc_otg_fiq_nop;
 102 -               }
 103 -
 104 -               regs.ARM_sp = (long) dwc_otg_hcd->fiq_stack + (sizeof(struct fiq_stack) - 4);
 105 -
 106 -//             __show_regs(&regs);
 107 -               set_fiq_regs(&regs);
 108 -
 109 -               //Set the mphi periph to  the required registers
 110 -               dwc_otg_hcd->fiq_state->mphi_regs.base    = otg_dev->os_dep.mphi_base;
 111 -               dwc_otg_hcd->fiq_state->mphi_regs.ctrl    = otg_dev->os_dep.mphi_base + 0x4c;
 112 -               dwc_otg_hcd->fiq_state->mphi_regs.outdda  = otg_dev->os_dep.mphi_base + 0x28;
 113 -               dwc_otg_hcd->fiq_state->mphi_regs.outddb  = otg_dev->os_dep.mphi_base + 0x2c;
 114 -               dwc_otg_hcd->fiq_state->mphi_regs.intstat = otg_dev->os_dep.mphi_base + 0x50;
 115 -               dwc_otg_hcd->fiq_state->dwc_regs_base = otg_dev->os_dep.base;
 116 -               DWC_WARN("MPHI regs_base at 0x%08x", (int)dwc_otg_hcd->fiq_state->mphi_regs.base);
 117 -               //Enable mphi peripheral
 118 -               writel((1<<31),dwc_otg_hcd->fiq_state->mphi_regs.ctrl);
 119 -#ifdef DEBUG
 120 -               if (readl(dwc_otg_hcd->fiq_state->mphi_regs.ctrl) & 0x80000000)
 121 -                       DWC_WARN("MPHI periph has been enabled");
 122 -               else
 123 -                       DWC_WARN("MPHI periph has NOT been enabled");
 124 -#endif
 125 -               // Enable FIQ interrupt from USB peripheral
 126 -               enable_fiq(INTERRUPT_VC_USB);
 127 -               local_fiq_enable();
 128 -       }
 129 +               smp_call_function_single(0, hcd_init_fiq, otg_dev, 1);
 130
 131
 132         otg_dev->hcd->otg_dev = otg_dev;
 133 --
 134 1.8.3.2
 135