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330 lines
8.2 KiB
Diff
330 lines
8.2 KiB
Diff
From 1ab2bc7fb6de19bcf4da83f4f0f384d93db48711 Mon Sep 17 00:00:00 2001
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From: Michael Zoran <mzoran@crowfest.net>
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Date: Sat, 14 Jan 2017 21:33:51 -0800
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Subject: [PATCH 098/806] ARM64/DWC_OTG: Port dwc_otg driver to ARM64
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In ARM64, the FIQ mechanism used by this driver is not current
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implemented. As a workaround, reqular IRQ is used instead
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of FIQ.
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In a separate change, the IRQ-CPU mapping is round robined
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on ARM64 to increase concurrency and allow multiple interrupts
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to be serviced at a time. This reduces the need for FIQ.
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Tests Run:
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This mechanism is most likely to break when multiple USB devices
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are attached at the same time. So the system was tested under
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stress.
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Devices:
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1. USB Speakers playing back a FLAC audio through VLC
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at 96KHz.(Higher then typically, but supported on my speakers).
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2. sftp transferring large files through the buildin ethernet
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connection which is connected through USB.
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3. Keyboard and mouse attached and being used.
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Although I do occasionally hear some glitches, the music seems to
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play quite well.
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Signed-off-by: Michael Zoran <mzoran@crowfest.net>
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---
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drivers/usb/host/dwc_otg/Makefile | 3 +
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drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 17 +++++
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drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h | 24 +++++++
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drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 4 ++
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drivers/usb/host/dwc_otg/dwc_otg_hcd_if.h | 4 ++
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drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 3 +-
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drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 72 ++++++++++++++++++++
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drivers/usb/host/dwc_otg/dwc_otg_os_dep.h | 2 +
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8 files changed, 128 insertions(+), 1 deletion(-)
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--- a/drivers/usb/host/dwc_otg/Makefile
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+++ b/drivers/usb/host/dwc_otg/Makefile
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@@ -37,7 +37,10 @@ dwc_otg-objs += dwc_otg_pcd_linux.o dwc_
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dwc_otg-objs += dwc_otg_hcd.o dwc_otg_hcd_linux.o dwc_otg_hcd_intr.o dwc_otg_hcd_queue.o dwc_otg_hcd_ddma.o
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dwc_otg-objs += dwc_otg_adp.o
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dwc_otg-objs += dwc_otg_fiq_fsm.o
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+ifneq ($(CONFIG_ARM64),y)
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dwc_otg-objs += dwc_otg_fiq_stub.o
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+endif
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+
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ifneq ($(CFI),)
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dwc_otg-objs += dwc_otg_cfi.o
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endif
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--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
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@@ -74,6 +74,21 @@ void notrace _fiq_print(enum fiq_debug_l
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}
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}
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+
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+#ifdef CONFIG_ARM64
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+
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+inline void fiq_fsm_spin_lock(fiq_lock_t *lock)
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+{
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+ spin_lock((spinlock_t *)lock);
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+}
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+
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+inline void fiq_fsm_spin_unlock(fiq_lock_t *lock)
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+{
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+ spin_unlock((spinlock_t *)lock);
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+}
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+
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+#else
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+
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/**
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* fiq_fsm_spin_lock() - ARMv6+ bare bones spinlock
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* Must be called with local interrupts and FIQ disabled.
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@@ -121,6 +136,8 @@ inline void fiq_fsm_spin_unlock(fiq_lock
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inline void fiq_fsm_spin_unlock(fiq_lock_t *lock) { }
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#endif
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+#endif
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+
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/**
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* fiq_fsm_restart_channel() - Poke channel enable bit for a split transaction
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* @channel: channel to re-enable
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--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h
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@@ -127,6 +127,12 @@ enum fiq_debug_level {
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FIQDBG_PORTHUB = (1 << 3),
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};
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+#ifdef CONFIG_ARM64
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+
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+typedef spinlock_t fiq_lock_t;
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+
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+#else
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+
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typedef struct {
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union {
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uint32_t slock;
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@@ -137,6 +143,8 @@ typedef struct {
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};
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} fiq_lock_t;
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+#endif
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+
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struct fiq_state;
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extern void _fiq_print (enum fiq_debug_level dbg_lvl, volatile struct fiq_state *state, char *fmt, ...);
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@@ -357,6 +365,22 @@ struct fiq_state {
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struct fiq_channel_state channel[0];
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};
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+#ifdef CONFIG_ARM64
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+
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+#ifdef local_fiq_enable
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+#undef local_fiq_enable
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+#endif
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+
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+#ifdef local_fiq_disable
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+#undef local_fiq_disable
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+#endif
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+
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+extern void local_fiq_enable(void);
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+
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+extern void local_fiq_disable(void);
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+
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+#endif
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+
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extern void fiq_fsm_spin_lock(fiq_lock_t *lock);
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extern void fiq_fsm_spin_unlock(fiq_lock_t *lock);
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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@@ -1014,6 +1014,10 @@ int dwc_otg_hcd_init(dwc_otg_hcd_t * hcd
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}
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DWC_MEMSET(hcd->fiq_state, 0, (sizeof(struct fiq_state) + (sizeof(struct fiq_channel_state) * num_channels)));
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+#ifdef CONFIG_ARM64
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+ spin_lock_init(&hcd->fiq_state->lock);
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+#endif
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+
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for (i = 0; i < num_channels; i++) {
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hcd->fiq_state->channel[i].fsm = FIQ_PASSTHROUGH;
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}
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_if.h
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_if.h
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@@ -116,7 +116,11 @@ extern int32_t dwc_otg_hcd_handle_intr(d
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/** This function is used to handle the fast interrupt
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*
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*/
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+#ifdef CONFIG_ARM64
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+extern void dwc_otg_hcd_handle_fiq(void);
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+#else
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extern void __attribute__ ((naked)) dwc_otg_hcd_handle_fiq(void);
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+#endif
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/**
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* Returns private data set by
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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@@ -36,8 +36,9 @@
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#include "dwc_otg_regs.h"
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#include <linux/jiffies.h>
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+#ifdef CONFIG_ARM
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#include <asm/fiq.h>
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-
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+#endif
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extern bool microframe_schedule;
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
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@@ -51,7 +51,9 @@
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#include <linux/dma-mapping.h>
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#include <linux/version.h>
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#include <asm/io.h>
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+#ifdef CONFIG_ARM
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#include <asm/fiq.h>
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+#endif
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#include <linux/usb.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
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#include <../drivers/usb/core/hcd.h>
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@@ -71,6 +73,13 @@
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#include "dwc_otg_driver.h"
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#include "dwc_otg_hcd.h"
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+#ifndef __virt_to_bus
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+#define __virt_to_bus __virt_to_phys
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+#define __bus_to_virt __phys_to_virt
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+#define __pfn_to_bus(x) __pfn_to_phys(x)
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+#define __bus_to_pfn(x) __phys_to_pfn(x)
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+#endif
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+
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extern unsigned char _dwc_otg_fiq_stub, _dwc_otg_fiq_stub_end;
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/**
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@@ -395,14 +404,49 @@ static struct dwc_otg_hcd_function_ops h
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.get_b_hnp_enable = _get_b_hnp_enable,
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};
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+#ifdef CONFIG_ARM64
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+
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+static int simfiq_irq = -1;
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+
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+void local_fiq_enable(void)
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+{
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+ if (simfiq_irq >= 0)
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+ enable_irq(simfiq_irq);
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+}
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+
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+void local_fiq_disable(void)
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+{
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+ if (simfiq_irq >= 0)
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+ disable_irq(simfiq_irq);
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+}
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+
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+irqreturn_t fiq_irq_handler(int irq, void *dev_id)
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+{
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+ dwc_otg_hcd_t *dwc_otg_hcd = (dwc_otg_hcd_t *)dev_id;
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+
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+ if (fiq_fsm_enable)
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+ dwc_otg_fiq_fsm(dwc_otg_hcd->fiq_state, dwc_otg_hcd->core_if->core_params->host_channels);
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+ else
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+ dwc_otg_fiq_nop(dwc_otg_hcd->fiq_state);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+#else
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static struct fiq_handler fh = {
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.name = "usb_fiq",
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};
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+#endif
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+
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static void hcd_init_fiq(void *cookie)
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{
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dwc_otg_device_t *otg_dev = cookie;
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dwc_otg_hcd_t *dwc_otg_hcd = otg_dev->hcd;
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+#ifdef CONFIG_ARM64
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+ int retval = 0;
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+ int irq;
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+#else
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struct pt_regs regs;
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int irq;
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@@ -430,6 +474,7 @@ static void hcd_init_fiq(void *cookie)
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// __show_regs(®s);
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set_fiq_regs(®s);
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+#endif
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//Set the mphi periph to the required registers
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dwc_otg_hcd->fiq_state->mphi_regs.base = otg_dev->os_dep.mphi_base;
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@@ -448,6 +493,23 @@ static void hcd_init_fiq(void *cookie)
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DWC_WARN("MPHI periph has NOT been enabled");
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#endif
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// Enable FIQ interrupt from USB peripheral
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+#ifdef CONFIG_ARM64
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+ irq = platform_get_irq(otg_dev->os_dep.platformdev, 1);
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+
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+ if (irq < 0) {
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+ DWC_ERROR("Can't get SIM-FIQ irq");
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+ return;
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+ }
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+
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+ retval = request_irq(irq, fiq_irq_handler, 0, "dwc_otg_sim-fiq", dwc_otg_hcd);
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+
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+ if (retval < 0) {
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+ DWC_ERROR("Unable to request SIM-FIQ irq\n");
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+ return;
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+ }
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+
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+ simfiq_irq = irq;
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+#else
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#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
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irq = platform_get_irq(otg_dev->os_dep.platformdev, 1);
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#else
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@@ -464,6 +526,8 @@ static void hcd_init_fiq(void *cookie)
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smp_mb();
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enable_fiq(irq);
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local_fiq_enable();
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+#endif
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+
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}
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/**
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@@ -526,6 +590,13 @@ int hcd_init(dwc_bus_dev_t *_dev)
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otg_dev->hcd = dwc_otg_hcd;
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otg_dev->hcd->otg_dev = otg_dev;
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+#ifdef CONFIG_ARM64
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+ if (dwc_otg_hcd_init(dwc_otg_hcd, otg_dev->core_if))
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+ goto error2;
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+
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+ if (fiq_enable)
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+ hcd_init_fiq(otg_dev);
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+#else
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if (dwc_otg_hcd_init(dwc_otg_hcd, otg_dev->core_if)) {
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goto error2;
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}
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@@ -542,6 +613,7 @@ int hcd_init(dwc_bus_dev_t *_dev)
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smp_call_function_single(0, hcd_init_fiq, otg_dev, 1);
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}
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}
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+#endif
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hcd->self.otg_port = dwc_otg_hcd_otg_port(dwc_otg_hcd);
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33) //don't support for LM(with 2.6.20.1 kernel)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_os_dep.h
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_os_dep.h
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@@ -76,8 +76,10 @@
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#ifdef PLATFORM_INTERFACE
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#include <linux/platform_device.h>
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+#ifdef CONFIG_ARM
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#include <asm/mach/map.h>
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#endif
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+#endif
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/** The OS page size */
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#define DWC_OS_PAGE_SIZE PAGE_SIZE
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