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Date: Thu, 20 Feb 2014 12:23:13 -0600
From: Felipe Balbi <balbi@...com>
To: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
CC: Felipe Balbi <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<michals@...inx.com>,
Subbaraya Sundeep Bhatta <sbhatta@...inx.com>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC] usb: gadget: Add xilinx axi usb2 device support
Hi,
On Wed, Feb 19, 2014 at 03:10:45PM +0530, Subbaraya Sundeep Bhatta wrote:
> This patch adds xilinx axi usb2 device driver support
>
> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
> ---
> .../devicetree/bindings/usb/xilinx_usb.txt | 21 +
> drivers/usb/gadget/Kconfig | 14 +
> drivers/usb/gadget/Makefile | 1 +
> drivers/usb/gadget/xilinx_udc.c | 2045 ++++++++++++++++++++
> 4 files changed, 2081 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/usb/xilinx_usb.txt
> create mode 100644 drivers/usb/gadget/xilinx_udc.c
>
> diff --git a/Documentation/devicetree/bindings/usb/xilinx_usb.txt b/Documentation/devicetree/bindings/usb/xilinx_usb.txt
> new file mode 100644
> index 0000000..acf03ab
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/xilinx_usb.txt
> @@ -0,0 +1,21 @@
> +Xilinx AXI USB2 device controller
> +
> +Required properties:
> +- compatible : Should be "xlnx,axi-usb2-device-4.00.a"
> +- reg : Physical base address and size of the Axi USB2
> + device registers map.
> +- interrupts : Property with a value describing the interrupt
> + number.
> +- interrupt-parent : Must be core interrupt controller
> +- xlnx,include-dma : Must be 1 or 0 based on whether DMA is included
> + in IP or not.
> +
> +Example:
> + axi-usb2-device@...00000 {
> + compatible = "xlnx,axi-usb2-device-4.00.a";
> + interrupt-parent = <0x1>;
> + interrupts = <0x0 0x39 0x1>;
> + reg = <0x42e00000 0x10000>;
> + xlnx,include-dma = <0x1>;
> + };
> +
you need to Cc devicetree@...r.kernel.org for this.
> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
> index 8154165..0b284bf 100644
> --- a/drivers/usb/gadget/Kconfig
> +++ b/drivers/usb/gadget/Kconfig
> @@ -466,6 +466,20 @@ config USB_EG20T
> ML7213/ML7831 is companion chip for Intel Atom E6xx series.
> ML7213/ML7831 is completely compatible for Intel EG20T PCH.
>
> +config USB_GADGET_XILINX
> + tristate "Xilinx USB Driver"
> + depends on MICROBLAZE || ARCH_ZYNQ
This has the tendency to grow and I really don't like seeing a bunch of
arch-specific dependencies. At a minimum add COMPILE_TEST so I can build
test on my setup and make sure it builds fine on other architectures.
> + help
> + USB peripheral controller driver for Xilinx AXI USB2 device.
> + Xilinx AXI USB2 device is a soft IP which supports both full
> + and high speed USB 2.0 data transfers. It has seven configurable
> + endpoints(bulk or interrupt or isochronous), as well as
> + endpoint zero(for control transfers).
> +
> + Say "y" to link the driver statically, or "m" to build a
> + dynamically linked module called "xilinx_udc" and force all
> + gadget drivers to also be dynamically linked.
> +
> #
> # LAST -- dummy/emulated controller
> #
> diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
> index 5f150bc..3a55564 100644
> --- a/drivers/usb/gadget/Makefile
> +++ b/drivers/usb/gadget/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_USB_FUSB300) += fusb300_udc.o
> obj-$(CONFIG_USB_FOTG210_UDC) += fotg210-udc.o
> obj-$(CONFIG_USB_MV_U3D) += mv_u3d_core.o
> obj-$(CONFIG_USB_GR_UDC) += gr_udc.o
> +obj-$(CONFIG_USB_GADGET_XILINX) += xilinx_udc.o
let's start normalizing the names here (I'll patch the others later) and
call this udc-xilinx.o
> diff --git a/drivers/usb/gadget/xilinx_udc.c b/drivers/usb/gadget/xilinx_udc.c
> new file mode 100644
> index 0000000..3ee8359
> --- /dev/null
> +++ b/drivers/usb/gadget/xilinx_udc.c
> @@ -0,0 +1,2045 @@
> +/*
> + * Xilinx USB peripheral controller driver
> + *
> + * Copyright (C) 2004 by Thomas Rathbone
> + * Copyright (C) 2005 by HP Labs
> + * Copyright (C) 2005 by David Brownell
heh! :-) Brownell was really everywhere, good to still see code from him
;-)
> + * Copyright (C) 2010 - 2014 Xilinx, Inc.
> + *
> + * Some parts of this driver code is based on the driver for at91-series
> + * USB peripheral controller (at91_udc.c).
> + *
> + * 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.
are you sure you want to allow people ot use GPL v3 on this driver ?
> +#include <linux/interrupt.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/prefetch.h>
> +#include <linux/usb/ch9.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/io.h>
> +#include <linux/seq_file.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_irq.h>
> +#include <linux/dma-mapping.h>
> +#include "gadget_chips.h"
> +
> +/* Register offsets for the USB device.*/
> +#define XUSB_EP0_CONFIG_OFFSET 0x0000 /* EP0 Config Reg Offset */
> +#define XUSB_SETUP_PKT_ADDR_OFFSET 0x0080 /* Setup Packet Address */
> +#define XUSB_ADDRESS_OFFSET 0x0100 /* Address Register */
> +#define XUSB_CONTROL_OFFSET 0x0104 /* Control Register */
> +#define XUSB_STATUS_OFFSET 0x0108 /* Status Register */
> +#define XUSB_FRAMENUM_OFFSET 0x010C /* Frame Number Register */
> +#define XUSB_IER_OFFSET 0x0110 /* Interrupt Enable Register */
> +#define XUSB_BUFFREADY_OFFSET 0x0114 /* Buffer Ready Register */
> +#define XUSB_TESTMODE_OFFSET 0x0118 /* Test Mode Register */
> +#define XUSB_DMA_RESET_OFFSET 0x0200 /* DMA Soft Reset Register */
> +#define XUSB_DMA_CONTROL_OFFSET 0x0204 /* DMA Control Register */
> +#define XUSB_DMA_DSAR_ADDR_OFFSET 0x0208 /* DMA source Address Reg */
> +#define XUSB_DMA_DDAR_ADDR_OFFSET 0x020C /* DMA destination Addr Reg */
> +#define XUSB_DMA_LENGTH_OFFSET 0x0210 /* DMA Length Register */
> +#define XUSB_DMA_STATUS_OFFSET 0x0214 /* DMA Status Register */
> +
> +/* Endpoint Configuration Space offsets */
> +#define XUSB_EP_CFGSTATUS_OFFSET 0x00 /* Endpoint Config Status */
> +#define XUSB_EP_BUF0COUNT_OFFSET 0x08 /* Buffer 0 Count */
> +#define XUSB_EP_BUF1COUNT_OFFSET 0x0C /* Buffer 1 Count */
> +
> +#define XUSB_CONTROL_USB_READY_MASK 0x80000000 /* USB ready Mask */
> +
> +/* Interrupt register related masks.*/
> +#define XUSB_STATUS_GLOBAL_INTR_MASK 0x80000000 /* Global Intr Enable */
> +#define XUSB_STATUS_RESET_MASK 0x00800000 /* USB Reset Mask */
> +#define XUSB_STATUS_SUSPEND_MASK 0x00400000 /* USB Suspend Mask */
> +#define XUSB_STATUS_DISCONNECT_MASK 0x00200000 /* USB Disconnect Mask */
> +#define XUSB_STATUS_FIFO_BUFF_RDY_MASK 0x00100000 /* FIFO Buff Ready Mask */
> +#define XUSB_STATUS_FIFO_BUFF_FREE_MASK 0x00080000 /* FIFO Buff Free Mask */
> +#define XUSB_STATUS_SETUP_PACKET_MASK 0x00040000 /* Setup packet received */
> +#define XUSB_STATUS_EP1_BUFF2_COMP_MASK 0x00000200 /* EP 1 Buff 2 Processed */
> +#define XUSB_STATUS_EP1_BUFF1_COMP_MASK 0x00000002 /* EP 1 Buff 1 Processed */
> +#define XUSB_STATUS_EP0_BUFF2_COMP_MASK 0x00000100 /* EP 0 Buff 2 Processed */
> +#define XUSB_STATUS_EP0_BUFF1_COMP_MASK 0x00000001 /* EP 0 Buff 1 Processed */
> +#define XUSB_STATUS_HIGH_SPEED_MASK 0x00010000 /* USB Speed Mask */
> +/* Suspend,Reset and Disconnect Mask */
> +#define XUSB_STATUS_INTR_EVENT_MASK 0x00E00000
> +/* Buffers completion Mask */
> +#define XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK 0x0000FEFF
> +/* Mask for buffer 0 and buffer 1 completion for all Endpoints */
> +#define XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK 0x00000101
> +#define XUSB_STATUS_EP_BUFF2_SHIFT 8 /* EP buffer offset */
> +
> +/* Endpoint Configuration Status Register */
> +#define XUSB_EP_CFG_VALID_MASK 0x80000000 /* Endpoint Valid bit */
> +#define XUSB_EP_CFG_STALL_MASK 0x40000000 /* Endpoint Stall bit */
> +#define XUSB_EP_CFG_DATA_TOGGLE_MASK 0x08000000 /* Endpoint Data toggle */
> +
> +/* USB device specific global configuration constants.*/
> +#define XUSB_MAX_ENDPOINTS 8 /* Maximum End Points */
> +#define XUSB_EP_NUMBER_ZERO 0 /* End point Zero */
> +
> +/* Test Modes (Set Feature).*/
> +#define TEST_J 1 /* Chirp J Test */
> +#define TEST_K 2 /* Chirp K Test */
> +#define TEST_SE0_NAK 3 /* Chirp SE0 Test */
> +#define TEST_PKT 4 /* Packet Test */
> +
> +#define CONFIGURATION_ONE 0x01 /* USB device configuration*/
> +#define STANDARD_OUT_DEVICE 0x00 /* Out device */
> +#define STANDARD_OUT_ENDPOINT 0x02 /* Standard Out end point */
DO NOT REDEFINE THESE, use the ones from <linux/usb/ch9.h>
> +
> +#define XUSB_DMA_READ_FROM_DPRAM 0x80000000/**< DPRAM is the source
> + address for DMA transfer
> + */
> +#define XUSB_DMA_DMASR_BUSY 0x80000000 /**< DMA busy*/
> +#define XUSB_DMA_DMASR_ERROR 0x40000000 /**< DMA Error */
> +
> +/*
> + * When this bit is set, the DMA buffer ready bit is set by hardware upon
> + * DMA transfer completion.
> + */
> +#define XUSB_DMA_BRR_CTRL 0x40000000 /**< DMA bufready ctrl bit */
> +
> +/* Phase States */
> +#define SETUP_PHASE 0x0000 /* Setup Phase */
> +#define DATA_PHASE 0x0001 /* Data Phase */
> +#define STATUS_PHASE 0x0002 /* Status Phase */
> +
> +#define EP_TRANSMIT 0 /* EP is IN endpoint */
> +#define EP0_MAX_PACKET 64 /* Endpoint 0 maximum packet length */
> +
> +/**
> + * struct xusb_request - Xilinx USB device request structure
> + * @usb_req: Linux usb request structure
> + * @queue: usb device request queue
> + */
> +struct xusb_request {
> + struct usb_request usb_req;
> + struct list_head queue;
> +};
> +
> +/**
> + * struct xusb_ep - USB end point structure.
> + * @ep_usb: usb endpoint instance
> + * @queue: endpoint message queue
> + * @udc: xilinx usb peripheral driver instance pointer
> + * @desc: pointer to the usb endpoint descriptor
> + * @data: pointer to the xusb_request structure
> + * @rambase: the endpoint buffer address
> + * @endpointoffset: the endpoint register offset value
> + * @epnumber: endpoint number
> + * @maxpacket: maximum packet size the endpoint can store
> + * @buffer0count: the size of the packet recieved in the first buffer
> + * @buffer0ready: the busy state of first buffer
> + * @buffer1count: the size of the packet received in the second buffer
> + * @buffer1ready: the busy state of second buffer
> + * @eptype: endpoint transfer type (BULK, INTERRUPT)
> + * @curbufnum: current buffer of endpoint that will be processed next
> + * @is_in: endpoint direction (IN or OUT)
> + * @stopped: endpoint active status
> + * @is_iso: endpoint type(isochronous or non isochronous)
> + * @name: name of the endpoint
> + */
> +struct xusb_ep {
> + struct usb_ep ep_usb;
> + struct list_head queue;
> + struct xusb_udc *udc;
> + const struct usb_endpoint_descriptor *desc;
> + struct xusb_request *data;
> + u32 rambase;
> + u32 endpointoffset;
> + u16 epnumber;
> + u16 maxpacket;
> + u16 buffer0count;
> + u16 buffer1count;
> + u8 buffer0ready;
> + u8 buffer1ready;
> + u8 eptype;
> + u8 curbufnum;
> + u8 is_in;
> + u8 stopped;
> + u8 is_iso;
> + char name[4];
> +};
> +
> +/**
> + * struct xusb_udc - USB peripheral driver structure
> + * @gadget: USB gadget driver instance
> + * @ep: an array of endpoint structures
> + * @driver: pointer to the usb gadget driver instance
> + * @read_fn: function pointer to read device registers
> + * @write_fn: function pointer to write to device registers
> + * @base_address: the usb device base address
> + * @lock: instance of spinlock
> + * @dma_enabled: flag indicating whether the dma is included in the system
> + * @status: status flag indicating the device cofiguration
> + */
> +struct xusb_udc {
> + struct usb_gadget gadget;
> + struct xusb_ep ep[8];
> + struct usb_gadget_driver *driver;
> + unsigned int (*read_fn)(void __iomem *);
> + void (*write_fn)(u32, void __iomem *);
> + void __iomem *base_address;
> + spinlock_t lock;
> + bool dma_enabled;
> + u8 status;
> +};
> +
> +/**
> + * struct cmdbuf - Standard USB Command Buffer Structure defined
> + * @setup: usb_ctrlrequest structure for control requests
> + * @contreadcount: read data bytes count
> + * @contwritecount: write data bytes count
> + * @setupseqtx: tx status
> + * @setupseqrx: rx status
> + * @contreadptr: pointer to endpoint0 read data
> + * @contwriteptr: pointer to endpoint0 write data
> + * @contreaddatabuffer: read data buffer for endpoint0
> + */
> +struct cmdbuf {
> + struct usb_ctrlrequest setup;
> + u32 contreadcount;
> + u32 contwritecount;
> + u32 setupseqtx;
> + u32 setupseqrx;
> + u8 *contreadptr;
> + u8 *contwriteptr;
> + u8 contreaddatabuffer[64];
> +};
> +
> +static struct cmdbuf ch9_cmdbuf;
NAK, you should support multiple instances of this device in the same
SoC.
> +/*
> + * Endpoint buffer start addresses in the core
> + */
fits in one line.
> +static u32 rambase[8] = { 0x22, 0x1000, 0x1100, 0x1200, 0x1300, 0x1400, 0x1500,
> + 0x1600 };
> +
> +static const char driver_name[] = "xilinx-udc";
> +static const char ep0name[] = "ep0";
> +
> +/* Control endpoint configuration.*/
> +static struct usb_endpoint_descriptor config_bulk_out_desc = {
> + .bLength = USB_DT_ENDPOINT_SIZE,
> + .bDescriptorType = USB_DT_ENDPOINT,
> + .bEndpointAddress = USB_DIR_OUT,
> + .bmAttributes = USB_ENDPOINT_XFER_BULK,
> + .wMaxPacketSize = __constant_cpu_to_le16(0x40),
> +};
> +
> +/**
> + * to_udc - Return the udc instance pointer
> + * @g: pointer to the usb gadget driver instance
> + *
> + * Return: xusb_udc pointer
> + */
> +static inline struct xusb_udc *to_udc(struct usb_gadget *g)
> +{
> +
remove this whiteline here. Also, this could very well be a macro
instead of a function. No strong feelings though.
> + return container_of(g, struct xusb_udc, gadget);
> +}
> +
> +/**
> + * xudc_write32 - little endian write to device registers
> + * @val: data to be written
> + * @addr: addr of device register
> + */
> +static void xudc_write32(u32 val, void __iomem *addr)
usually, people tend to pass addr, offset and value. Then you do the
quick little math internally:
iowrite32(val, addr + offset);
no strong feelings either.
> +static int xudc_eptxrx(struct xusb_ep *ep, u8 *bufferptr, u32 bufferlen,
> + u8 direction)
> +{
> + u32 *eprambase;
> + u32 bytestosend;
> + u8 *temprambase;
> + unsigned long timeout;
> + u32 srcaddr = 0;
> + u32 dstaddr = 0;
> + int rc = 0;
> + struct xusb_udc *udc = ep->udc;
> +
> + bytestosend = bufferlen;
> +
> + /* Put the transmit buffer into the correct ping-pong buffer.*/
> + if (!ep->curbufnum && !ep->buffer0ready) {
> + /* Get the Buffer address and copy the transmit data.*/
> + eprambase = (u32 __force *)(ep->udc->base_address +
> + ep->rambase);
> +
> + if (ep->udc->dma_enabled) {
> + if (direction == EP_TRANSMIT) {
> + srcaddr = dma_map_single(
> + ep->udc->gadget.dev.parent,
> + bufferptr, bufferlen, DMA_TO_DEVICE);
> + dstaddr = virt_to_phys(eprambase);
> + udc->write_fn(bufferlen,
> + ep->udc->base_address +
> + ep->endpointoffset +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(XUSB_DMA_BRR_CTRL |
> + (1 << ep->epnumber),
> + ep->udc->base_address +
> + XUSB_DMA_CONTROL_OFFSET);
> + } else {
> + srcaddr = virt_to_phys(eprambase);
> + dstaddr = dma_map_single(
> + ep->udc->gadget.dev.parent,
> + bufferptr, bufferlen, DMA_FROM_DEVICE);
> + udc->write_fn(XUSB_DMA_BRR_CTRL |
> + XUSB_DMA_READ_FROM_DPRAM |
> + (1 << ep->epnumber),
> + ep->udc->base_address +
> + XUSB_DMA_CONTROL_OFFSET);
> + }
> + /*
> + * Set the addresses in the DMA source and destination
> + * registers and then set the length into the DMA length
> + * register.
> + */
> + udc->write_fn(srcaddr, ep->udc->base_address +
> + XUSB_DMA_DSAR_ADDR_OFFSET);
> + udc->write_fn(dstaddr, ep->udc->base_address +
> + XUSB_DMA_DDAR_ADDR_OFFSET);
> + udc->write_fn(bufferlen, ep->udc->base_address +
> + XUSB_DMA_LENGTH_OFFSET);
> + } else {
> +
> + while (bytestosend > 3) {
> + if (direction == EP_TRANSMIT)
> + *eprambase++ = *(u32 *)bufferptr;
> + else
> + *(u32 *)bufferptr = *eprambase++;
> + bufferptr += 4;
> + bytestosend -= 4;
> + }
> + temprambase = (u8 *)eprambase;
> + while (bytestosend--) {
> + if (direction == EP_TRANSMIT)
> + *temprambase++ = *bufferptr++;
> + else
> + *bufferptr++ = *temprambase++;
> + }
> + /*
> + * Set the Buffer count register with transmit length
> + * and enable the buffer for transmission.
> + */
> + if (direction == EP_TRANSMIT)
> + udc->write_fn(bufferlen,
> + ep->udc->base_address +
> + ep->endpointoffset +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(1 << ep->epnumber,
> + ep->udc->base_address +
> + XUSB_BUFFREADY_OFFSET);
> + }
> + ep->buffer0ready = 1;
> + ep->curbufnum = 1;
> +
> + } else
> + if ((ep->curbufnum == 1) && (!ep->buffer1ready)) {
> +
> + /* Get the Buffer address and copy the transmit data.*/
> + eprambase = (u32 __force *)(ep->udc->base_address +
> + ep->rambase + ep->ep_usb.maxpacket);
> + if (ep->udc->dma_enabled) {
> + if (direction == EP_TRANSMIT) {
> + srcaddr = dma_map_single(
> + ep->udc->gadget.dev.parent,
> + bufferptr, bufferlen,
> + DMA_TO_DEVICE);
> + dstaddr = virt_to_phys(eprambase);
> + udc->write_fn(bufferlen,
> + ep->udc->base_address +
> + ep->endpointoffset +
> + XUSB_EP_BUF1COUNT_OFFSET);
> + udc->write_fn(XUSB_DMA_BRR_CTRL |
> + (1 << (ep->epnumber +
> + XUSB_STATUS_EP_BUFF2_SHIFT)),
> + ep->udc->base_address +
> + XUSB_DMA_CONTROL_OFFSET);
> + } else {
> + srcaddr = virt_to_phys(eprambase);
> + dstaddr = dma_map_single(
> + ep->udc->gadget.dev.parent,
> + bufferptr, bufferlen,
> + DMA_FROM_DEVICE);
> + udc->write_fn(XUSB_DMA_BRR_CTRL |
> + XUSB_DMA_READ_FROM_DPRAM |
> + (1 << (ep->epnumber +
> + XUSB_STATUS_EP_BUFF2_SHIFT)),
> + ep->udc->base_address +
> + XUSB_DMA_CONTROL_OFFSET);
> + }
> + /*
> + * Set the addresses in the DMA source and
> + * destination registers and then set the length
> + * into the DMA length register.
> + */
> + udc->write_fn(srcaddr,
> + ep->udc->base_address +
> + XUSB_DMA_DSAR_ADDR_OFFSET);
> + udc->write_fn(dstaddr,
> + ep->udc->base_address +
> + XUSB_DMA_DDAR_ADDR_OFFSET);
> + udc->write_fn(bufferlen,
> + ep->udc->base_address +
> + XUSB_DMA_LENGTH_OFFSET);
> + } else {
> + while (bytestosend > 3) {
> + if (direction == EP_TRANSMIT)
> + *eprambase++ =
> + *(u32 *)bufferptr;
> + else
> + *(u32 *)bufferptr =
> + *eprambase++;
> + bufferptr += 4;
> + bytestosend -= 4;
> + }
> + temprambase = (u8 *)eprambase;
> + while (bytestosend--) {
> + if (direction == EP_TRANSMIT)
> + *temprambase++ = *bufferptr++;
> + else
> + *bufferptr++ = *temprambase++;
> + }
> + /*
> + * Set the Buffer count register with transmit
> + * length and enable the buffer for
> + * transmission.
> + */
> + if (direction == EP_TRANSMIT)
> + udc->write_fn(bufferlen,
> + ep->udc->base_address +
> + ep->endpointoffset +
> + XUSB_EP_BUF1COUNT_OFFSET);
> + udc->write_fn(1 << (ep->epnumber +
> + XUSB_STATUS_EP_BUFF2_SHIFT),
> + ep->udc->base_address +
> + XUSB_BUFFREADY_OFFSET);
> + }
> + ep->buffer1ready = 1;
> + ep->curbufnum = 0;
> + } else {
> + /*
> + * None of the ping-pong buffer is free. Return a
> + * failure.
> + */
> + return 1;
> + }
> +
> + if (ep->udc->dma_enabled) {
> + /*
> + * Wait till DMA transaction is complete and
> + * check whether the DMA transaction was
> + * successful.
> + */
> + while ((udc->read_fn(ep->udc->base_address +
> + XUSB_DMA_STATUS_OFFSET) &
> + XUSB_DMA_DMASR_BUSY) == XUSB_DMA_DMASR_BUSY) {
> + timeout = jiffies + 10000;
> +
> + if (time_after(jiffies, timeout)) {
> + rc = -ETIMEDOUT;
> + goto clean;
> + }
> +
> + }
> + if ((udc->read_fn(ep->udc->base_address +
> + XUSB_DMA_STATUS_OFFSET) &
> + XUSB_DMA_DMASR_ERROR) == XUSB_DMA_DMASR_ERROR)
> + dev_dbg(&ep->udc->gadget.dev, "DMA Error\n");
> +clean:
> + if (direction == EP_TRANSMIT) {
> + dma_unmap_single(ep->udc->gadget.dev.parent,
> + srcaddr, bufferlen, DMA_TO_DEVICE);
> + } else {
> + dma_unmap_single(ep->udc->gadget.dev.parent,
> + dstaddr, bufferlen, DMA_FROM_DEVICE);
> + }
> + }
> + return rc;
> +}
what a big function. Looks like you could split it into smaller
functions to aid redability.
> +static int xudc_ep_enable(struct usb_ep *_ep,
> + const struct usb_endpoint_descriptor *desc)
> +{
> + struct xusb_ep *ep = container_of(_ep, struct xusb_ep, ep_usb);
> + struct xusb_udc *dev = ep->udc;
> + u32 tmp;
> + u8 eptype = 0;
> + unsigned long flags;
> + u32 epcfg;
> + struct xusb_udc *udc = ep->udc;
> +
> + /*
> + * The check for _ep->name == ep0name is not done as this enable i used
> + * for enabling ep0 also. In other gadget drivers, this ep name is not
> + * used.
> + */
> + if (!_ep || !desc || ep->desc ||
> + desc->bDescriptorType != USB_DT_ENDPOINT) {
> + dev_dbg(&ep->udc->gadget.dev, "first check fails\n");
you need a more descriptive message here.
> + return -EINVAL;
> + }
> +
> + if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
> + dev_dbg(&ep->udc->gadget.dev, "bogus device state\n");
> + return -ESHUTDOWN;
> + }
> +
> +
> + ep->is_in = ((desc->bEndpointAddress & USB_DIR_IN) != 0);
> + /*
> + * Bit 3...0: endpoint number
> + */
fits in one line, no need for multiline comment.
> + ep->epnumber = (desc->bEndpointAddress & 0x0f);
> + ep->stopped = 0;
> + ep->desc = desc;
> + ep->ep_usb.desc = desc;
> + tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
> + spin_lock_irqsave(&ep->udc->lock, flags);
> + ep->ep_usb.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
> +
> + switch (tmp) {
> + case USB_ENDPOINT_XFER_CONTROL:
> + dev_dbg(&ep->udc->gadget.dev, "only one control endpoint\n");
> + /* NON- ISO */
> + eptype = 0;
> + spin_unlock_irqrestore(&ep->udc->lock, flags);
> + return -EINVAL;
> + case USB_ENDPOINT_XFER_INT:
> + /* NON- ISO */
> + eptype = 0;
> + if (ep->ep_usb.maxpacket > 64)
> + goto bogus_max;
> + break;
> + case USB_ENDPOINT_XFER_BULK:
> + /* NON- ISO */
> + eptype = 0;
> + switch (ep->ep_usb.maxpacket) {
> + case 8:
> + case 16:
> + case 32:
> + case 64:
> + case 512:
> + goto ok;
bogus indentation.
> + }
> +bogus_max:
> + dev_dbg(&ep->udc->gadget.dev, "bogus maxpacket %d\n",
> + ep->ep_usb.maxpacket);
> + spin_unlock_irqrestore(&ep->udc->lock, flags);
> + return -EINVAL;
> + case USB_ENDPOINT_XFER_ISOC:
> + /* ISO */
> + eptype = 1;
> + ep->is_iso = 1;
> + break;
> + }
> +
> +ok: ep->eptype = eptype;
the label sits in a line by itself:
ok:
ep->eptype = eptype;
...
> +static int xudc_ep_disable(struct usb_ep *_ep)
> +{
> + struct xusb_ep *ep = container_of(_ep, struct xusb_ep, ep_usb);
> + unsigned long flags;
> + u32 epcfg;
> + struct xusb_udc *udc = ep->udc;
> +
> + if (ep == &ep->udc->ep[XUSB_EP_NUMBER_ZERO]) {
> + dev_dbg(&ep->udc->gadget.dev, "Ep0 disable called\n");
> + return -EINVAL;
> + }
> + spin_lock_irqsave(&ep->udc->lock, flags);
> +
> + xudc_nuke(ep, -ESHUTDOWN);
> +
> + /* Restore the endpoint's pristine config */
> + ep->desc = NULL;
> + ep->ep_usb.desc = NULL;
> +
> + ep->stopped = 1;
> +
> + dev_dbg(&ep->udc->gadget.dev, "USB Ep %d disable\n ", ep->epnumber);
> +
> + /* Disable the endpoint.*/
> + epcfg = udc->read_fn(ep->udc->base_address + ep->endpointoffset);
> + epcfg &= ~XUSB_EP_CFG_VALID_MASK;
> + udc->write_fn(epcfg, ep->udc->base_address + ep->endpointoffset);
> + spin_unlock_irqrestore(&ep->udc->lock, flags);
> + return 0;
> +}
> +
> +/**
> + * xudc_ep_alloc_request - Initializes the request queue.
> + * @_ep: pointer to the usb device endpoint structure.
> + * @gfp_flags: Flags related to the request call.
> + *
> + * Return: pointer to request structure on success and a NULL on failure.
> + */
> +static struct usb_request *xudc_ep_alloc_request(struct usb_ep *_ep,
> + gfp_t gfp_flags)
> +{
> + struct xusb_request *req;
> +
> + req = kmalloc(sizeof(*req), gfp_flags);
use kzalloc...
> + if (!req)
> + return NULL;
> +
> + memset(req, 0, sizeof(*req));
... and drop this list head.
> + INIT_LIST_HEAD(&req->queue);
remove this INIT_LIST_HEAD();
also, before returning, I suppose you probably want to link the request
to the endpoint somehow. Usually people save the endpoint pointer inside
the private request structure (iow: req->ep = ep;)
> + return &req->usb_req;
> +}
> +
> +/**
> + * xudc_free_request - Releases the request from queue.
> + * @_ep: pointer to the usb device endpoint structure.
> + * @_req: pointer to the usb request structure.
> + */
> +static void xudc_free_request(struct usb_ep *_ep, struct usb_request *_req)
> +{
> + struct xusb_ep *ep = container_of(_ep, struct xusb_ep, ep_usb);
> + struct xusb_request *req;
> +
> + req = container_of(_req, struct xusb_request, usb_req);
define helper macros for these two container_of(). It helps with
readability.
> + if (!list_empty(&req->queue))
> + dev_warn(&ep->udc->gadget.dev, "Error: No memory to free");
what did you want to do here ? Perhaps:
if (list_empty(&req->queue)) {
dev_warn(&ep->udc->gadget.dev, "Error: no request to free");
return;
}
???
> + kfree(req);
> +}
> +
> +/**
> + * xudc_ep_queue - Adds the request to the queue.
> + * @_ep: pointer to the usb device endpoint structure.
> + * @_req: pointer to the usb request structure.
> + * @gfp_flags: Flags related to the request call.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xudc_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
> + gfp_t gfp_flags)
> +{
> + struct xusb_request *req;
> + struct xusb_ep *ep;
> + struct xusb_udc *dev;
> + unsigned long flags;
> + u32 length, count;
> + u8 *corebuf;
> + struct xusb_udc *udc;
> +
> + req = container_of(_req, struct xusb_request, usb_req);
> + ep = container_of(_ep, struct xusb_ep, ep_usb);
> + udc = ep->udc;
> +
> + if (!_req || !_req->complete || !_req->buf ||
> + !list_empty(&req->queue)) {
> + dev_dbg(&ep->udc->gadget.dev, "invalid request\n");
> + return -EINVAL;
> + }
> +
> + if (!_ep || (!ep->desc && ep->ep_usb.name != ep0name)) {
> + dev_dbg(&ep->udc->gadget.dev, "invalid ep\n");
> + return -EINVAL;
> + }
> +
> + dev = ep->udc;
> + if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
> + dev_dbg(&ep->udc->gadget.dev, "%s, bogus device state %p\n",
> + __func__, dev->driver);
> + return -ESHUTDOWN;
> + }
> +
> + spin_lock_irqsave(&dev->lock, flags);
> +
> + _req->status = -EINPROGRESS;
> + _req->actual = 0;
> +
> + /* Try to kickstart any empty and idle queue */
> + if (list_empty(&ep->queue)) {
> + if (!ep->epnumber) {
> + ep->data = req;
> + if (ch9_cmdbuf.setup.bRequestType & USB_DIR_IN) {
> + ch9_cmdbuf.contwriteptr = req->usb_req.buf +
> + req->usb_req.actual;
> + prefetch(ch9_cmdbuf.contwriteptr);
> + length = req->usb_req.length -
> + req->usb_req.actual;
> + corebuf = (void __force *) ((ep->rambase << 2) +
> + ep->udc->base_address);
> + ch9_cmdbuf.contwritecount = length;
> + length = count = min_t(u32, length,
> + EP0_MAX_PACKET);
> + while (length--)
> + *corebuf++ = *ch9_cmdbuf.contwriteptr++;
> + udc->write_fn(count, ep->udc->base_address +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(1, ep->udc->base_address +
> + XUSB_BUFFREADY_OFFSET);
> + ch9_cmdbuf.contwritecount -= count;
> + } else {
> + if (ch9_cmdbuf.setup.wLength) {
> + ch9_cmdbuf.contreadptr =
> + req->usb_req.buf +
> + req->usb_req.actual;
> + udc->write_fn(req->usb_req.length ,
> + ep->udc->base_address +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(1, ep->udc->base_address
> + + XUSB_BUFFREADY_OFFSET);
> + } else {
> + xudc_wrstatus(udc);
> + req = NULL;
> + }
> + }
> + } else {
> +
> + if (ep->is_in) {
> + dev_dbg(&ep->udc->gadget.dev,
> + "xudc_write_fifo called from queue\n");
> + if (xudc_write_fifo(ep, req) == 1)
> + req = NULL;
> + } else {
> + dev_dbg(&ep->udc->gadget.dev,
> + "xudc_read_fifo called from queue\n");
> + if (xudc_read_fifo(ep, req) == 1)
> + req = NULL;
> + }
> + }
> + }
> +
> + if (req != NULL)
> + list_add_tail(&req->queue, &ep->queue);
> + spin_unlock_irqrestore(&dev->lock, flags);
> + return 0;
> +}
> +
> +/**
> + * xudc_ep_dequeue - Removes the request from the queue.
> + * @_ep: pointer to the usb device endpoint structure.
> + * @_req: pointer to the usb request structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xudc_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
> +{
> + struct xusb_ep *ep;
> + struct xusb_request *req;
> + unsigned long flags;
> +
> + ep = container_of(_ep, struct xusb_ep, ep_usb);
> +
> + if (!_ep || ep->ep_usb.name == ep0name)
> + return -EINVAL;
> +
> + spin_lock_irqsave(&ep->udc->lock, flags);
> + /* Make sure it's actually queued on this endpoint */
> + list_for_each_entry(req, &ep->queue, queue) {
> + if (&req->usb_req == _req)
> + break;
> + }
> + if (&req->usb_req != _req) {
> + spin_unlock_irqrestore(&ep->udc->lock, flags);
> + return -EINVAL;
> + }
> +
> + xudc_done(ep, req, -ECONNRESET);
> + spin_unlock_irqrestore(&ep->udc->lock, flags);
> +
> + return 0;
> +}
> +
> +static struct usb_ep_ops xusb_ep_ops = {
> + .enable = xudc_ep_enable,
> + .disable = xudc_ep_disable,
> +
> + .alloc_request = xudc_ep_alloc_request,
> + .free_request = xudc_free_request,
> +
> + .queue = xudc_ep_queue,
> + .dequeue = xudc_ep_dequeue,
> + .set_halt = xudc_ep_set_halt,
> +};
> +
> +/**
> + * xudc_get_frame - Reads the current usb frame number.
> + * @gadget: pointer to the usb gadget structure.
> + *
> + * Return: current frame number for success and error value on failure.
> + */
> +static int xudc_get_frame(struct usb_gadget *gadget)
> +{
> +
> + struct xusb_udc *udc = to_udc(gadget);
> + unsigned long flags;
> + int retval;
> +
> + if (!gadget)
> + return -ENODEV;
> +
> + local_irq_save(flags);
> + retval = udc->read_fn(udc->base_address + XUSB_FRAMENUM_OFFSET);
> + local_irq_restore(flags);
> + return retval;
> +}
> +
> +/**
> + * xudc_reinit - Restores inital software state.
> + * @udc: pointer to the usb device controller structure.
> + */
> +static void xudc_reinit(struct xusb_udc *udc)
> +{
> + u32 ep_number;
> + char name[4];
> +
> + INIT_LIST_HEAD(&udc->gadget.ep_list);
> + INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
> +
> + for (ep_number = 0; ep_number < XUSB_MAX_ENDPOINTS; ep_number++) {
> + struct xusb_ep *ep = &udc->ep[ep_number];
> +
> + if (ep_number) {
> + list_add_tail(&ep->ep_usb.ep_list,
> + &udc->gadget.ep_list);
> + ep->ep_usb.maxpacket = (unsigned short)~0;
> + sprintf(name, "ep%d", ep_number);
> + strcpy(ep->name, name);
> + ep->ep_usb.name = ep->name;
> + } else {
> + ep->ep_usb.name = ep0name;
> + ep->ep_usb.maxpacket = 0x40;
> + }
> +
> + ep->ep_usb.ops = &xusb_ep_ops;
> + ep->udc = udc;
> + ep->epnumber = ep_number;
> + ep->desc = NULL;
> + ep->stopped = 0;
> + /*
> + * The configuration register address offset between
> + * each endpoint is 0x10.
> + */
> + ep->endpointoffset = XUSB_EP0_CONFIG_OFFSET +
> + (ep_number * 0x10);
> + ep->is_in = 0;
> + ep->is_iso = 0;
> + ep->maxpacket = 0;
> + xudc_epconfig(ep, udc);
> + udc->status = 0;
> +
> + /* Initialize one queue per endpoint */
> + INIT_LIST_HEAD(&ep->queue);
> + }
> +}
> +
> +/**
> + * xudc_stop_activity - Stops any further activity on the device.
> + * @udc: pointer to the usb device controller structure.
> + */
> +static void xudc_stop_activity(struct xusb_udc *udc)
> +{
> + struct usb_gadget_driver *driver = udc->driver;
> + int i;
> +
> + if (udc->gadget.speed == USB_SPEED_UNKNOWN)
> + driver = NULL;
> + udc->gadget.speed = USB_SPEED_HIGH;
> +
> + for (i = 0; i < XUSB_MAX_ENDPOINTS; i++) {
> + struct xusb_ep *ep = &udc->ep[i];
> +
> + ep->stopped = 1;
> + xudc_nuke(ep, -ESHUTDOWN);
> + }
> + if (driver) {
> + spin_unlock(&udc->lock);
> + driver->disconnect(&udc->gadget);
> + spin_lock(&udc->lock);
> + }
you shouldn't be calling disconnect here, udc-core is doing that for
you.
> +
> + xudc_reinit(udc);
> +}
> +
> +/**
> + * xudc_start - Starts the device.
> + * @gadget: pointer to the usb gadget structure
> + * @driver: pointer to gadget driver structure
> + *
> + * Return: zero always
> + */
> +static int xudc_start(struct usb_gadget *gadget,
> + struct usb_gadget_driver *driver)
> +{
> + struct xusb_udc *udc = to_udc(gadget);
> + const struct usb_endpoint_descriptor *d = &config_bulk_out_desc;
> +
> + driver->driver.bus = NULL;
> + /* hook up the driver */
> + udc->driver = driver;
> + udc->gadget.dev.driver = &driver->driver;
> + udc->gadget.speed = driver->max_speed;
> +
> + /* Enable the USB device.*/
> + xudc_ep_enable(&udc->ep[XUSB_EP_NUMBER_ZERO].ep_usb, d);
> + udc->write_fn(0, (udc->base_address + XUSB_ADDRESS_OFFSET));
> + udc->write_fn(XUSB_CONTROL_USB_READY_MASK,
> + udc->base_address + XUSB_CONTROL_OFFSET);
> +
> + return 0;
> +}
> +
> +/**
> + * xudc_stop - stops the device.
> + * @gadget: pointer to the usb gadget structure
> + * @driver: pointer to usb gadget driver structure
> + *
> + * Return: zero always
> + */
> +static int xudc_stop(struct usb_gadget *gadget,
> + struct usb_gadget_driver *driver)
> +{
> + struct xusb_udc *udc = to_udc(gadget);
> + unsigned long flags;
> + u32 crtlreg;
> +
> + /* Disable USB device.*/
> + crtlreg = udc->read_fn(udc->base_address + XUSB_CONTROL_OFFSET);
> + crtlreg &= ~XUSB_CONTROL_USB_READY_MASK;
> + udc->write_fn(crtlreg, udc->base_address + XUSB_CONTROL_OFFSET);
> + spin_lock_irqsave(&udc->lock, flags);
> + udc->gadget.speed = USB_SPEED_UNKNOWN;
> + xudc_stop_activity(udc);
> + spin_unlock_irqrestore(&udc->lock, flags);
> +
> + udc->gadget.dev.driver = NULL;
> + udc->driver = NULL;
> +
> + return 0;
> +}
> +
> +static const struct usb_gadget_ops xusb_udc_ops = {
> + .get_frame = xudc_get_frame,
> + .udc_start = xudc_start,
> + .udc_stop = xudc_stop,
> +};
> +
> +/**
> + * xudc_startup_handler - The usb device controller interrupt handler.
> + * @callbackref: pointer to the reference value being passed.
> + * @intrstatus: The mask value containing the interrupt sources.
> + *
> + * This handler handles the RESET, SUSPEND and DISCONNECT interrupts.
> + */
> +static void xudc_startup_handler(void *callbackref, u32 intrstatus)
why void ? why isn't this returning irqreturn_t ?
> +{
> + struct xusb_udc *udc;
> + u32 intrreg;
> +
> + udc = (struct xusb_udc *) callbackref;
you don't need the cast here.
> + if (intrstatus & XUSB_STATUS_RESET_MASK) {
> + dev_dbg(&udc->gadget.dev, "Reset\n");
> + if (intrstatus & XUSB_STATUS_HIGH_SPEED_MASK)
> + udc->gadget.speed = USB_SPEED_HIGH;
> + else
> + udc->gadget.speed = USB_SPEED_FULL;
> +
> + if (udc->status == 1) {
> + udc->status = 0;
> + /* Set device address to 0.*/
> + udc->write_fn(0, udc->base_address +
> + XUSB_ADDRESS_OFFSET);
> + }
> + /* Disable the Reset interrupt.*/
> + intrreg = udc->read_fn(udc->base_address +
> + XUSB_IER_OFFSET);
> +
> + intrreg &= ~XUSB_STATUS_RESET_MASK;
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + /* Enable thesuspend and disconnect.*/
> + intrreg =
> + udc->read_fn(udc->base_address + XUSB_IER_OFFSET);
> + intrreg |=
> + (XUSB_STATUS_SUSPEND_MASK |
> + XUSB_STATUS_DISCONNECT_MASK);
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + }
> +
> + if (intrstatus & XUSB_STATUS_DISCONNECT_MASK) {
> +
> + /* Disable the Disconnect interrupt.*/
> + intrreg =
> + udc->read_fn(udc->base_address + XUSB_IER_OFFSET);
> + intrreg &= ~XUSB_STATUS_DISCONNECT_MASK;
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + dev_dbg(&udc->gadget.dev, "Disconnect\n");
> + if (udc->status == 1) {
> + udc->status = 0;
> + /* Set device address to 0.*/
> + udc->write_fn(0, udc->base_address +
> + XUSB_ADDRESS_OFFSET);
> + /* Enable the USB device.*/
> + udc->write_fn(XUSB_CONTROL_USB_READY_MASK,
> + udc->base_address + XUSB_CONTROL_OFFSET);
> + }
> +
> + /* Enable the suspend and reset interrupts.*/
> + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET) |
> + XUSB_STATUS_SUSPEND_MASK |
> + XUSB_STATUS_RESET_MASK;
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + xudc_stop_activity(udc);
> + }
> +
> + if (intrstatus & XUSB_STATUS_SUSPEND_MASK) {
> + dev_dbg(&udc->gadget.dev, "Suspend\n");
> + /* Disable the Suspend interrupt.*/
> + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET) &
> + ~XUSB_STATUS_SUSPEND_MASK;
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + /* Enable the Disconnect and reset interrupts. */
> + intrreg = udc->read_fn(udc->base_address + XUSB_IER_OFFSET) |
> + XUSB_STATUS_DISCONNECT_MASK |
> + XUSB_STATUS_RESET_MASK;
> + udc->write_fn(intrreg, udc->base_address + XUSB_IER_OFFSET);
> + }
> +}
> +
> +/**
> + * xudc_set_clear_feature - Executes the set feature and clear feature commands.
> + * @udc: pointer to the usb device controller structure.
> + * @flag: Value deciding the set or clear action.
> + *
> + * Processes the SET_FEATURE and CLEAR_FEATURE commands.
> + */
> +static void xudc_set_clear_feature(struct xusb_udc *udc, int flag)
> +{
> + u8 endpoint;
> + u8 outinbit;
> + u32 epcfgreg;
> +
> + switch (ch9_cmdbuf.setup.bRequestType) {
> + case STANDARD_OUT_DEVICE:
use the macros from <linux/usb/ch9.h>
> + switch (ch9_cmdbuf.setup.wValue) {
> + case USB_DEVICE_TEST_MODE:
> + /*
> + * The Test Mode will be executed
> + * after the status phase.
> + */
> + break;
> +
> + default:
> + epcfgreg = udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + epcfgreg |= XUSB_EP_CFG_STALL_MASK;
> + udc->write_fn(epcfgreg, udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + break;
> + }
> + break;
> +
> + case STANDARD_OUT_ENDPOINT:
use the macros from <linux/usb/ch9.h>
> + if (!ch9_cmdbuf.setup.wValue) {
> + endpoint = ch9_cmdbuf.setup.wIndex & 0xf;
> + outinbit = ch9_cmdbuf.setup.wIndex & 0x80;
> + outinbit = outinbit >> 7;
> +
> + /* Make sure direction matches.*/
> + if (outinbit != udc->ep[endpoint].is_in) {
> + epcfgreg = udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> + epcfgreg |= XUSB_EP_CFG_STALL_MASK;
> +
> + udc->write_fn(epcfgreg, udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> + return;
> + }
> +
> + if (!endpoint) {
> + /* Clear the stall.*/
> + epcfgreg = udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> +
> + epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
> +
> + udc->write_fn(epcfgreg, udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> + break;
> + } else {
> + if (flag == 1) {
> + epcfgreg =
> + udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> + epcfgreg |= XUSB_EP_CFG_STALL_MASK;
> +
> + udc->write_fn(epcfgreg,
> + udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].
> + endpointoffset);
> + } else {
> + /* Unstall the endpoint.*/
> + epcfgreg =
> + udc->read_fn(udc->base_address +
> + udc->ep[endpoint].
> + endpointoffset);
> + epcfgreg &=
> + ~(XUSB_EP_CFG_STALL_MASK |
> + XUSB_EP_CFG_DATA_TOGGLE_MASK);
> + udc->write_fn(epcfgreg,
> + udc->base_address +
> + udc->ep[endpoint].
> + endpointoffset);
> + }
> + }
> + }
> + break;
> +
> + default:
> + epcfgreg = udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + epcfgreg |= XUSB_EP_CFG_STALL_MASK;
> + udc->write_fn(epcfgreg, udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + return;
> + }
> +
> + /* Cause and valid status phase to be issued.*/
> + xudc_wrstatus(udc);
> +
> + return;
> +}
> +
> +/**
> + * xudc_execute_cmd - Processes the USB specification chapter 9 commands.
> + * @udc: pointer to the usb device controller structure.
> + *
> + * Return: 0 for success and the same reuqest command if it is not handled.
> + */
> +static int xudc_execute_cmd(struct xusb_udc *udc)
> +{
> +
> + if ((ch9_cmdbuf.setup.bRequestType & USB_TYPE_MASK) ==
> + USB_TYPE_STANDARD) {
> + /* Process the chapter 9 command.*/
> + switch (ch9_cmdbuf.setup.bRequest) {
> +
> + case USB_REQ_CLEAR_FEATURE:
> + xudc_set_clear_feature(udc, 0);
> + break;
> +
> + case USB_REQ_SET_FEATURE:
> + xudc_set_clear_feature(udc, 1);
> + break;
> +
> + case USB_REQ_SET_ADDRESS:
> + xudc_wrstatus(udc);
> + break;
> +
> + case USB_REQ_SET_CONFIGURATION:
> + udc->status = 1;
> + return ch9_cmdbuf.setup.bRequest;
> +
> + default:
> + /*
> + * Return the same request to application for
> + * handling.
> + */
> + return ch9_cmdbuf.setup.bRequest;
> + }
> +
> + } else {
> + if ((ch9_cmdbuf.setup.bRequestType & USB_TYPE_MASK) ==
> + USB_TYPE_CLASS)
> + return ch9_cmdbuf.setup.bRequest;
> + }
> + return 0;
> +}
> +
> +/**
> + * xudc_handle_setup - Processes the setup packet.
> + * @udc: pointer to the usb device controller structure.
> + * @ctrl: pointer to the usb control endpoint structure.
> + *
> + * Return: 0 for success and request to be handled by application if
> + * is not handled by the driver.
> + */
> +static int xudc_handle_setup(struct xusb_udc *udc, struct usb_ctrlrequest *ctrl)
> +{
> + u32 *ep0rambase;
> +
> + /* Load up the chapter 9 command buffer.*/
> + ep0rambase = (u32 __force *) (udc->base_address +
> + XUSB_SETUP_PKT_ADDR_OFFSET);
> + memcpy((void *)&ch9_cmdbuf.setup, (void *)ep0rambase, 8);
> +
> + ctrl->bRequestType = ch9_cmdbuf.setup.bRequestType;
> + ctrl->bRequest = ch9_cmdbuf.setup.bRequest;
> + ctrl->wValue = ch9_cmdbuf.setup.wValue;
> + ctrl->wIndex = ch9_cmdbuf.setup.wIndex;
> + ctrl->wLength = ch9_cmdbuf.setup.wLength;
> +
> + ch9_cmdbuf.setup.wValue = cpu_to_le16(ch9_cmdbuf.setup.wValue);
> + ch9_cmdbuf.setup.wIndex = cpu_to_le16(ch9_cmdbuf.setup.wIndex);
> + ch9_cmdbuf.setup.wLength = cpu_to_le16(ch9_cmdbuf.setup.wLength);
> +
> + /* Restore ReadPtr to data buffer.*/
> + ch9_cmdbuf.contreadptr = &ch9_cmdbuf.contreaddatabuffer[0];
> + ch9_cmdbuf.contreadcount = 0;
> +
> + if (ch9_cmdbuf.setup.bRequestType & USB_DIR_IN) {
> + /* Execute the get command.*/
> + ch9_cmdbuf.setupseqrx = STATUS_PHASE;
> + ch9_cmdbuf.setupseqtx = DATA_PHASE;
> + return xudc_execute_cmd(udc);
> + } else {
> + /* Execute the put command.*/
> + ch9_cmdbuf.setupseqrx = DATA_PHASE;
> + ch9_cmdbuf.setupseqtx = STATUS_PHASE;
> + return xudc_execute_cmd(udc);
> + }
> + /* Control should never come here.*/
> + return 0;
> +}
> +
> +/**
> + * xudc_ep0_out - Processes the endpoint 0 OUT token.
> + * @udc: pointer to the usb device controller structure.
> + */
> +static void xudc_ep0_out(struct xusb_udc *udc)
> +{
> + struct xusb_ep *ep;
> + u8 count;
> + u8 *ep0rambase;
> + u16 index;
> +
> + ep = &udc->ep[0];
> + switch (ch9_cmdbuf.setupseqrx) {
> + case STATUS_PHASE:
what about the setup phase ?
> + /*
> + * This resets both state machines for the next
> + * Setup packet.
> + */
> + ch9_cmdbuf.setupseqrx = SETUP_PHASE;
> + ch9_cmdbuf.setupseqtx = SETUP_PHASE;
> + ep->data->usb_req.actual = ep->data->usb_req.length;
> + xudc_done(ep, ep->data, 0);
> + break;
> +
> + case DATA_PHASE:
> + count = udc->read_fn(udc->base_address +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + /* Copy the data to be received from the DPRAM. */
> + ep0rambase =
> + (u8 __force *) (udc->base_address +
> + (udc->ep[XUSB_EP_NUMBER_ZERO].rambase << 2));
> +
> + for (index = 0; index < count; index++)
> + *ch9_cmdbuf.contreadptr++ = *ep0rambase++;
> +
> + ch9_cmdbuf.contreadcount += count;
> + if (ch9_cmdbuf.setup.wLength == ch9_cmdbuf.contreadcount) {
> + xudc_wrstatus(udc);
> + } else {
> + /* Set the Tx packet size and the Tx enable bit.*/
> + udc->write_fn(0, udc->base_address +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(1, udc->base_address +
> + XUSB_BUFFREADY_OFFSET);
> + }
> + break;
> +
> + default:
> + break;
> + }
> +}
> +
> +/**
> + * xudc_ep0_in - Processes the endpoint 0 IN token.
> + * @udc: pointer to the usb device controller structure.
> + */
> +static void xudc_ep0_in(struct xusb_udc *udc)
> +{
> + struct xusb_ep *ep;
> + u32 epcfgreg;
> + u16 count;
> + u16 length;
> + u8 *ep0rambase;
> +
> + ep = &udc->ep[0];
> + switch (ch9_cmdbuf.setupseqtx) {
> + case STATUS_PHASE:
> + if (ch9_cmdbuf.setup.bRequest == USB_REQ_SET_ADDRESS) {
> + /* Set the address of the device.*/
> + udc->write_fn(ch9_cmdbuf.setup.wValue,
> + (udc->base_address +
> + XUSB_ADDRESS_OFFSET));
> + break;
> + } else {
> + if (ch9_cmdbuf.setup.bRequest == USB_REQ_SET_FEATURE) {
> + if (ch9_cmdbuf.setup.bRequestType ==
> + STANDARD_OUT_DEVICE) {
> + if (ch9_cmdbuf.setup.wValue ==
> + USB_DEVICE_TEST_MODE)
> + udc->write_fn(TEST_J,
> + udc->base_address +
> + XUSB_TESTMODE_OFFSET);
use a switch.
> + }
> + }
> + }
> + ep->data->usb_req.actual = ch9_cmdbuf.setup.wLength;
> + xudc_done(ep, ep->data, 0);
> + break;
> +
> + case DATA_PHASE:
> + if (!ch9_cmdbuf.contwritecount) {
> + /*
> + * We're done with data transfer, next
> + * will be zero length OUT with data toggle of
> + * 1. Setup data_toggle.
> + */
> + epcfgreg = udc->read_fn(udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + epcfgreg |= XUSB_EP_CFG_DATA_TOGGLE_MASK;
> + udc->write_fn(epcfgreg, udc->base_address +
> + udc->ep[XUSB_EP_NUMBER_ZERO].endpointoffset);
> + count = 0;
> +
> + ch9_cmdbuf.setupseqtx = STATUS_PHASE;
> +
> + } else {
> + length = count = min_t(u32, ch9_cmdbuf.contwritecount,
> + EP0_MAX_PACKET);
> + /* Copy the data to be transmitted into the DPRAM. */
> + ep0rambase = (u8 __force *) (udc->base_address +
> + (udc->ep[XUSB_EP_NUMBER_ZERO].rambase << 2));
> + while (length--)
> + *ep0rambase++ = *ch9_cmdbuf.contwriteptr++;
> +
> + ch9_cmdbuf.contwritecount -= count;
> + }
> + udc->write_fn(count, udc->base_address +
> + XUSB_EP_BUF0COUNT_OFFSET);
> + udc->write_fn(1, udc->base_address + XUSB_BUFFREADY_OFFSET);
> + break;
> +
> + default:
> + break;
> + }
> +}
> +
> +/**
> + * xudc_ctrl_ep_handler - Endpoint 0 interrupt handler.
> + * @callbackref: pointer to the call back reference passed by the
> + * main interrupt handler.
> + * @intrstatus: It's the mask value for the interrupt sources on endpoint 0.
> + *
> + * Processes the commands received during enumeration phase.
> + */
> +static void xudc_ctrl_ep_handler(void *callbackref, u32 intrstatus)
> +{
> + struct xusb_udc *udc;
> + struct usb_ctrlrequest ctrl;
> + int status;
> + int epnum;
> + u32 intrreg;
> +
> + udc = (struct xusb_udc *) callbackref;
> + /* Process the end point zero buffer interrupt.*/
> + if (intrstatus & XUSB_STATUS_EP0_BUFF1_COMP_MASK) {
> + if (intrstatus & XUSB_STATUS_SETUP_PACKET_MASK) {
> + /*
> + * Enable the Disconnect, suspend and reset
> + * interrupts.
> + */
> + intrreg = udc->read_fn(udc->base_address +
> + XUSB_IER_OFFSET);
> + intrreg |= XUSB_STATUS_DISCONNECT_MASK |
> + XUSB_STATUS_SUSPEND_MASK |
> + XUSB_STATUS_RESET_MASK;
> + udc->write_fn(intrreg,
> + udc->base_address + XUSB_IER_OFFSET);
> + status = xudc_handle_setup(udc, &ctrl);
> + if (status || ((ch9_cmdbuf.setup.bRequestType &
> + USB_TYPE_MASK) == USB_TYPE_CLASS)) {
> + /*
> + * Request is to be handled by the gadget
> + * driver.
> + */
> + spin_unlock(&udc->lock);
> + udc->driver->setup(&udc->gadget, &ctrl);
> + spin_lock(&udc->lock);
> + } else {
> + if (ctrl.bRequest == USB_REQ_CLEAR_FEATURE) {
> + epnum = ctrl.wIndex & 0xf;
> + udc->ep[epnum].stopped = 0;
> + }
> + if (ctrl.bRequest == USB_REQ_SET_FEATURE) {
> + epnum = ctrl.wIndex & 0xf;
> + udc->ep[epnum].stopped = 1;
> + }
> + }
> + } else {
> + if (intrstatus & XUSB_STATUS_FIFO_BUFF_RDY_MASK)
> + xudc_ep0_out(udc);
> + else if (intrstatus &
> + XUSB_STATUS_FIFO_BUFF_FREE_MASK)
> + xudc_ep0_in(udc);
> + }
> + }
> +}
> +
> +/**
> + * xudc_nonctrl_ep_handler - Non control endpoint interrupt handler.
> + * @callbackref: pointer to the call back reference passed by the
> + * main interrupt handler.
> + * @epnum: End point number for which the interrupt is to be processed
> + * @intrstatus: It's the mask value for the interrupt sources on endpoint 0.
> + */
> +static void xudc_nonctrl_ep_handler(void *callbackref, u8 epnum,
> + u32 intrstatus)
> +{
> +
> + struct xusb_request *req;
> + struct xusb_udc *udc;
> + struct xusb_ep *ep;
> +
> + udc = (struct xusb_udc *) callbackref;
> + ep = &udc->ep[epnum];
> + /* Process the End point interrupts.*/
> + if (intrstatus & (XUSB_STATUS_EP0_BUFF1_COMP_MASK << epnum))
> + ep->buffer0ready = 0;
> + if (intrstatus & (XUSB_STATUS_EP0_BUFF2_COMP_MASK << epnum))
> + ep->buffer1ready = 0;
> +
> + if (list_empty(&ep->queue))
> + req = NULL;
> + else
> + req = list_entry(ep->queue.next, struct xusb_request, queue);
> + if (!req)
> + return;
> + if (ep->is_in)
> + xudc_write_fifo(ep, req);
> + else
> + xudc_read_fifo(ep, req);
> +}
> +
> +/**
> + * xudc_irq - The main interrupt handler.
> + * @irq: The interrupt number.
> + * @_udc: pointer to the usb device controller structure.
> + *
> + * Return: IRQ_HANDLED after the interrupt is handled.
> + */
> +static irqreturn_t xudc_irq(int irq, void *_udc)
> +{
> + struct xusb_udc *udc = _udc;
> + u32 intrstatus;
> + u8 index;
> + u32 bufintr;
> +
> + spin_lock(&(udc->lock));
> +
> + /* Read the Interrupt Status Register.*/
> + intrstatus = udc->read_fn(udc->base_address + XUSB_STATUS_OFFSET);
> + /* Call the handler for the event interrupt.*/
> + if (intrstatus & XUSB_STATUS_INTR_EVENT_MASK) {
> + /*
> + * Check if there is any action to be done for :
> + * - USB Reset received {XUSB_STATUS_RESET_MASK}
> + * - USB Suspend received {XUSB_STATUS_SUSPEND_MASK}
what about resume ? No resume ?
> + * - USB Disconnect received {XUSB_STATUS_DISCONNECT_MASK}
> + */
> + xudc_startup_handler(udc, intrstatus);
> + }
> +
> + /* Check the buffer completion interrupts */
> + if (intrstatus & XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK) {
> + if (intrstatus & XUSB_STATUS_EP0_BUFF1_COMP_MASK)
> + xudc_ctrl_ep_handler(udc, intrstatus);
> +
> + for (index = 1; index < 8; index++) {
> + bufintr = ((intrstatus &
> + (XUSB_STATUS_EP1_BUFF1_COMP_MASK <<
> + (index - 1))) ||
> + (intrstatus &
> + (XUSB_STATUS_EP1_BUFF2_COMP_MASK <<
> + (index - 1))));
> +
> + if (bufintr)
> + xudc_nonctrl_ep_handler(udc, index,
> + intrstatus);
> + }
> + }
> + spin_unlock(&(udc->lock));
> +
> + return IRQ_HANDLED;
> +}
> +
> +
> +
> +/**
> + * xudc_release - Releases device structure
> + * @dev: pointer to device structure
> + */
> +static void xudc_release(struct device *dev)
> +{
> +}
you don't need to define this, udc-core will give you a release method.
> +/**
> + * xudc_probe - The device probe function for driver initialization.
> + * @pdev: pointer to the platform device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xudc_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct resource *res;
> + struct xusb_udc *udc;
> + int irq;
> + int ret;
> +
> + dev_dbg(&pdev->dev, "%s(%p)\n", __func__, pdev);
> +
> + udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
> + if (!udc)
> + return -ENOMEM;
> +
> + /* Map the registers */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + udc->base_address = devm_ioremap_nocache(&pdev->dev, res->start,
> + resource_size(res));
use devm_ioremap_resource() instead.
> + if (!udc->base_address)
> + return -ENOMEM;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(&pdev->dev, "unable to get irq\n");
> + return irq;
> + }
> + ret = request_irq(irq, xudc_irq, 0, dev_name(&pdev->dev), udc);
devm_request_irq()
> + if (ret < 0) {
> + dev_dbg(&pdev->dev, "unable to request irq %d", irq);
> + goto fail0;
> + }
> +
> + udc->dma_enabled = of_property_read_bool(np, "xlnx,include-dma");
> +
> + /* Setup gadget structure */
> + udc->gadget.ops = &xusb_udc_ops;
> + udc->gadget.max_speed = USB_SPEED_HIGH;
> + udc->gadget.speed = USB_SPEED_HIGH;
> + udc->gadget.ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO].ep_usb;
> + udc->gadget.name = driver_name;
> +
> + dev_set_name(&udc->gadget.dev, "xilinx_udc");
> + udc->gadget.dev.release = xudc_release;
> + udc->gadget.dev.parent = &pdev->dev;
don't touch the gadget device directly, udc-core handles all of that for
you.
> +
> + spin_lock_init(&udc->lock);
> +
> + /* Check for IP endianness */
> + udc->write_fn = xudc_write32_be;
> + udc->read_fn = xudc_read32_be;
> + udc->write_fn(TEST_J, udc->base_address + XUSB_TESTMODE_OFFSET);
> + if ((udc->read_fn(udc->base_address + XUSB_TESTMODE_OFFSET))
> + != TEST_J) {
> + udc->write_fn = xudc_write32;
> + udc->read_fn = xudc_read32;
> + }
> + udc->write_fn(0, udc->base_address + XUSB_TESTMODE_OFFSET);
> +
> + xudc_reinit(udc);
> +
> + /* Set device address to 0.*/
> + udc->write_fn(0, udc->base_address + XUSB_ADDRESS_OFFSET);
> +
> + ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
> + if (ret)
> + goto fail1;
> +
> + /* Enable the interrupts.*/
> + udc->write_fn(XUSB_STATUS_GLOBAL_INTR_MASK | XUSB_STATUS_RESET_MASK |
> + XUSB_STATUS_DISCONNECT_MASK | XUSB_STATUS_SUSPEND_MASK |
> + XUSB_STATUS_FIFO_BUFF_RDY_MASK |
> + XUSB_STATUS_FIFO_BUFF_FREE_MASK |
> + XUSB_STATUS_EP0_BUFF1_COMP_MASK,
> + udc->base_address + XUSB_IER_OFFSET);
> +
> + platform_set_drvdata(pdev, udc);
> +
> + dev_info(&pdev->dev, "%s #%d at 0x%08X mapped to 0x%08X\n",
> + driver_name, 0, (u32)res->start,
> + (u32 __force)udc->base_address);
make this a dev_vdbg().
> +
> + return 0;
> +
> +fail1:
> + free_irq(irq, udc);
> +fail0:
> + dev_dbg(&pdev->dev, "probe failed, %d\n", ret);
this should be dev_err().
> + return ret;
> +}
> +
> +/**
> + * xudc_remove - Releases the resources allocated during the initialization.
> + * @pdev: pointer to the platform device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int xudc_remove(struct platform_device *pdev)
> +{
> + struct xusb_udc *udc = platform_get_drvdata(pdev);
> +
> + dev_dbg(&pdev->dev, "remove\n");
> + usb_del_gadget_udc(&udc->gadget);
> + if (udc->driver)
> + return -EBUSY;
> +
> + device_unregister(&udc->gadget.dev);
remove this line.
Also, you're leaking your IRQ handler, if you switch to
devm_request_irq() then you don't need to free it, though.
From the looks of it, I doubt this was actually tested, you need a lot
of work on this driver.
cheers
--
balbi
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