318 lines
8.6 KiB
C
318 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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wedged : 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 WARNING(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,__func__)
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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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