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https://github.com/edk2-porting/linux-next.git
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1f26e28d3e
The net2280 driver is too eager to send zero-length packets when IN tokens are received on ep0. No such packet should be sent (the driver should NAK) before the gadget driver has queued the proper response. Otherwise deferred responses are impossible. This patch (as823) makes net2280 avoid sending ZLPs for IN transfers on ep0 until a response has been submitted, and avoids stalling when an OUT packet is received before a request has been submitted for an OUT transfer on ep0. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
317 lines
8.6 KiB
C
317 lines
8.6 KiB
C
/*
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* NetChip 2280 high/full speed USB device controller.
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* Unlike many such controllers, this one talks PCI.
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*/
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/*
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* Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com)
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* Copyright (C) 2003 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/usb/net2280.h>
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/*-------------------------------------------------------------------------*/
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#ifdef __KERNEL__
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/* indexed registers [11.10] are accessed indirectly
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* caller must own the device lock.
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*/
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static inline u32
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get_idx_reg (struct net2280_regs __iomem *regs, u32 index)
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{
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writel (index, ®s->idxaddr);
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/* NOTE: synchs device/cpu memory views */
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return readl (®s->idxdata);
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}
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static inline void
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set_idx_reg (struct net2280_regs __iomem *regs, u32 index, u32 value)
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{
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writel (index, ®s->idxaddr);
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writel (value, ®s->idxdata);
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/* posted, may not be visible yet */
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}
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#endif /* __KERNEL__ */
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#define REG_DIAG 0x0
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#define RETRY_COUNTER 16
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#define FORCE_PCI_SERR 11
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#define FORCE_PCI_INTERRUPT 10
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#define FORCE_USB_INTERRUPT 9
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#define FORCE_CPU_INTERRUPT 8
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#define ILLEGAL_BYTE_ENABLES 5
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#define FAST_TIMES 4
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#define FORCE_RECEIVE_ERROR 2
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#define FORCE_TRANSMIT_CRC_ERROR 0
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#define REG_FRAME 0x02 /* from last sof */
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#define REG_CHIPREV 0x03 /* in bcd */
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#define REG_HS_NAK_RATE 0x0a /* NAK per N uframes */
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#define CHIPREV_1 0x0100
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#define CHIPREV_1A 0x0110
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#ifdef __KERNEL__
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/* ep a-f highspeed and fullspeed maxpacket, addresses
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* computed from ep->num
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*/
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#define REG_EP_MAXPKT(dev,num) (((num) + 1) * 0x10 + \
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(((dev)->gadget.speed == USB_SPEED_HIGH) ? 0 : 1))
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/*-------------------------------------------------------------------------*/
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/* [8.3] for scatter/gather i/o
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* use struct net2280_dma_regs bitfields
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*/
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struct net2280_dma {
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__le32 dmacount;
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__le32 dmaaddr; /* the buffer */
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__le32 dmadesc; /* next dma descriptor */
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__le32 _reserved;
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} __attribute__ ((aligned (16)));
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/*-------------------------------------------------------------------------*/
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/* DRIVER DATA STRUCTURES and UTILITIES */
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struct net2280_ep {
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struct usb_ep ep;
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struct net2280_ep_regs __iomem *regs;
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struct net2280_dma_regs __iomem *dma;
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struct net2280_dma *dummy;
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dma_addr_t td_dma; /* of dummy */
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struct net2280 *dev;
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unsigned long irqs;
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/* analogous to a host-side qh */
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struct list_head queue;
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const struct usb_endpoint_descriptor *desc;
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unsigned num : 8,
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fifo_size : 12,
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in_fifo_validate : 1,
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out_overflow : 1,
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stopped : 1,
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is_in : 1,
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is_iso : 1,
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responded : 1;
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};
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static inline void allow_status (struct net2280_ep *ep)
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{
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/* ep0 only */
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writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
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| (1 << CLEAR_NAK_OUT_PACKETS)
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| (1 << CLEAR_NAK_OUT_PACKETS_MODE)
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, &ep->regs->ep_rsp);
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ep->stopped = 1;
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}
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/* count (<= 4) bytes in the next fifo write will be valid */
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static inline void set_fifo_bytecount (struct net2280_ep *ep, unsigned count)
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{
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writeb (count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
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}
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struct net2280_request {
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struct usb_request req;
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struct net2280_dma *td;
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dma_addr_t td_dma;
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struct list_head queue;
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unsigned mapped : 1,
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valid : 1;
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};
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struct net2280 {
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/* each pci device provides one gadget, several endpoints */
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struct usb_gadget gadget;
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spinlock_t lock;
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struct net2280_ep ep [7];
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struct usb_gadget_driver *driver;
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unsigned enabled : 1,
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protocol_stall : 1,
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softconnect : 1,
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got_irq : 1,
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region : 1;
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u16 chiprev;
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/* pci state used to access those endpoints */
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struct pci_dev *pdev;
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struct net2280_regs __iomem *regs;
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struct net2280_usb_regs __iomem *usb;
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struct net2280_pci_regs __iomem *pci;
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struct net2280_dma_regs __iomem *dma;
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struct net2280_dep_regs __iomem *dep;
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struct net2280_ep_regs __iomem *epregs;
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struct pci_pool *requests;
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// statistics...
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};
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static inline void set_halt (struct net2280_ep *ep)
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{
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/* ep0 and bulk/intr endpoints */
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writel ( (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
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/* set NAK_OUT for erratum 0114 */
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| ((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS)
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| (1 << SET_ENDPOINT_HALT)
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, &ep->regs->ep_rsp);
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}
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static inline void clear_halt (struct net2280_ep *ep)
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{
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/* ep0 and bulk/intr endpoints */
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writel ( (1 << CLEAR_ENDPOINT_HALT)
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| (1 << CLEAR_ENDPOINT_TOGGLE)
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/* unless the gadget driver left a short packet in the
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* fifo, this reverses the erratum 0114 workaround.
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*/
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| ((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS)
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, &ep->regs->ep_rsp);
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}
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#ifdef USE_RDK_LEDS
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static inline void net2280_led_init (struct net2280 *dev)
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{
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/* LED3 (green) is on during USB activity. note erratum 0113. */
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writel ((1 << GPIO3_LED_SELECT)
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| (1 << GPIO3_OUTPUT_ENABLE)
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| (1 << GPIO2_OUTPUT_ENABLE)
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| (1 << GPIO1_OUTPUT_ENABLE)
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| (1 << GPIO0_OUTPUT_ENABLE)
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, &dev->regs->gpioctl);
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}
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/* indicate speed with bi-color LED 0/1 */
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static inline
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void net2280_led_speed (struct net2280 *dev, enum usb_device_speed speed)
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{
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u32 val = readl (&dev->regs->gpioctl);
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switch (speed) {
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case USB_SPEED_HIGH: /* green */
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val &= ~(1 << GPIO0_DATA);
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val |= (1 << GPIO1_DATA);
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break;
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case USB_SPEED_FULL: /* red */
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val &= ~(1 << GPIO1_DATA);
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val |= (1 << GPIO0_DATA);
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break;
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default: /* (off/black) */
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val &= ~((1 << GPIO1_DATA) | (1 << GPIO0_DATA));
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break;
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}
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writel (val, &dev->regs->gpioctl);
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}
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/* indicate power with LED 2 */
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static inline void net2280_led_active (struct net2280 *dev, int is_active)
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{
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u32 val = readl (&dev->regs->gpioctl);
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// FIXME this LED never seems to turn on.
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if (is_active)
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val |= GPIO2_DATA;
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else
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val &= ~GPIO2_DATA;
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writel (val, &dev->regs->gpioctl);
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}
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static inline void net2280_led_shutdown (struct net2280 *dev)
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{
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/* turn off all four GPIO*_DATA bits */
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writel (readl (&dev->regs->gpioctl) & ~0x0f,
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&dev->regs->gpioctl);
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}
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#else
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#define net2280_led_init(dev) do { } while (0)
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#define net2280_led_speed(dev, speed) do { } while (0)
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#define net2280_led_shutdown(dev) do { } while (0)
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#endif
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/*-------------------------------------------------------------------------*/
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#define xprintk(dev,level,fmt,args...) \
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printk(level "%s %s: " fmt , driver_name , \
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pci_name(dev->pdev) , ## args)
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#ifdef DEBUG
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#undef DEBUG
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#define DEBUG(dev,fmt,args...) \
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xprintk(dev , KERN_DEBUG , fmt , ## args)
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#else
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#define DEBUG(dev,fmt,args...) \
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do { } while (0)
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#endif /* DEBUG */
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#ifdef VERBOSE
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#define VDEBUG DEBUG
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#else
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#define VDEBUG(dev,fmt,args...) \
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do { } while (0)
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#endif /* VERBOSE */
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#define ERROR(dev,fmt,args...) \
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xprintk(dev , KERN_ERR , fmt , ## args)
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#define WARN(dev,fmt,args...) \
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xprintk(dev , KERN_WARNING , fmt , ## args)
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#define INFO(dev,fmt,args...) \
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xprintk(dev , KERN_INFO , fmt , ## args)
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/*-------------------------------------------------------------------------*/
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static inline void start_out_naking (struct net2280_ep *ep)
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{
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/* NOTE: hardware races lurk here, and PING protocol issues */
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writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
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/* synch with device */
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readl (&ep->regs->ep_rsp);
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}
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#ifdef DEBUG
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static inline void assert_out_naking (struct net2280_ep *ep, const char *where)
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{
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u32 tmp = readl (&ep->regs->ep_stat);
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if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
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DEBUG (ep->dev, "%s %s %08x !NAK\n",
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ep->ep.name, where, tmp);
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writel ((1 << SET_NAK_OUT_PACKETS),
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&ep->regs->ep_rsp);
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}
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}
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#define ASSERT_OUT_NAKING(ep) assert_out_naking(ep,__FUNCTION__)
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#else
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#define ASSERT_OUT_NAKING(ep) do {} while (0)
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#endif
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static inline void stop_out_naking (struct net2280_ep *ep)
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{
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u32 tmp;
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tmp = readl (&ep->regs->ep_stat);
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if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
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writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
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}
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#endif /* __KERNEL__ */
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