This patch implements the low-level part of the USB CDC layer for AT91 Other boards can use this patch as an example to connect their own.
It does not enable the use of CDC ethernet for any of the AT91 boards. Separate patches are required for that. It works in combination with CONFIG_NET_MULTI.
Signed-off-by: Thomas Smits ts.smits@gmail.com Signed-off-by: Remy Bohmer linux@bohmer.net --- arch/arm/include/asm/arch-at91/at91_dbgu.h | 69 ++ arch/arm/include/asm/arch-at91/cpu.h | 99 ++ drivers/usb/gadget/Makefile | 1 + drivers/usb/gadget/at91_udc.c | 1553 ++++++++++++++++++++++++++++ include/usb/at91_udc.h | 209 ++++ 5 files changed, 1931 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/arch-at91/at91_dbgu.h create mode 100644 arch/arm/include/asm/arch-at91/cpu.h create mode 100644 drivers/usb/gadget/at91_udc.c create mode 100644 include/usb/at91_udc.h
diff --git a/arch/arm/include/asm/arch-at91/at91_dbgu.h b/arch/arm/include/asm/arch-at91/at91_dbgu.h new file mode 100644 index 0000000..55210da --- /dev/null +++ b/arch/arm/include/asm/arch-at91/at91_dbgu.h @@ -0,0 +1,69 @@ +/* + * include/asm-arm/arch-at91/at91_dbgu.h + * + * Copyright (C) 2005 Ivan Kokshaysky + * Copyright (C) SAN People + * + * Debug Unit (DBGU) - System peripherals registers. + * Based on AT91RM9200 datasheet revision E. + * + * 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. + */ + +#ifndef AT91_DBGU_H +#define AT91_DBGU_H + +#ifdef AT91_DBGU +#define AT91_DBGU_CR (AT91_DBGU + 0x00) /* Control Register */ +#define AT91_DBGU_MR (AT91_DBGU + 0x04) /* Mode Register */ +#define AT91_DBGU_IER (AT91_DBGU + 0x08) /* Interrupt Enable */ +#define AT91_DBGU_TXRDY (1 << 1) /* Transmitter Ready */ +#define AT91_DBGU_TXEMPTY (1 << 9) /* Transmitter Empty */ +#define AT91_DBGU_IDR (AT91_DBGU + 0x0c) /* Interrupt Disable */ +#define AT91_DBGU_IMR (AT91_DBGU + 0x10) /* Interrupt Mask */ +#define AT91_DBGU_SR (AT91_DBGU + 0x14) /* Status Register */ +#define AT91_DBGU_RHR (AT91_DBGU + 0x18) /* Receiver Holding */ +#define AT91_DBGU_THR (AT91_DBGU + 0x1c) /* Transmitter Holding */ +#define AT91_DBGU_BRGR (AT91_DBGU + 0x20) /* Baud Rate Generator */ + +#define AT91_DBGU_CIDR (AT91_DBGU + 0x40) /* Chip ID Register */ +#define AT91_DBGU_EXID (AT91_DBGU + 0x44) /* Chip ID Extension */ +#define AT91_DBGU_FNR (AT91_DBGU + 0x48) /* Force NTRST [SAM9 only] */ +#define AT91_DBGU_FNTRST (1 << 0) /* Force NTRST */ + +#endif /* AT91_DBGU */ + +/* + * Some AT91 parts that don't have full DEBUG units still support the ID + * and extensions register. + */ +#define AT91_CIDR_VERSION (0x1f << 0) /* Version of the Device */ +#define AT91_CIDR_EPROC (7 << 5) /* Embedded Processor */ +#define AT91_CIDR_NVPSIZ (0xf << 8) /* Nonvolatile Program + Memory Size */ +#define AT91_CIDR_NVPSIZ2 (0xf << 12) /* Second Nonvolatile + Program Memory Size */ +#define AT91_CIDR_SRAMSIZ (0xf << 16) /* Internal SRAM Size */ +#define AT91_CIDR_SRAMSIZ_1K (1 << 16) +#define AT91_CIDR_SRAMSIZ_2K (2 << 16) +#define AT91_CIDR_SRAMSIZ_112K (4 << 16) +#define AT91_CIDR_SRAMSIZ_4K (5 << 16) +#define AT91_CIDR_SRAMSIZ_80K (6 << 16) +#define AT91_CIDR_SRAMSIZ_160K (7 << 16) +#define AT91_CIDR_SRAMSIZ_8K (8 << 16) +#define AT91_CIDR_SRAMSIZ_16K (9 << 16) +#define AT91_CIDR_SRAMSIZ_32K (10 << 16) +#define AT91_CIDR_SRAMSIZ_64K (11 << 16) +#define AT91_CIDR_SRAMSIZ_128K (12 << 16) +#define AT91_CIDR_SRAMSIZ_256K (13 << 16) +#define AT91_CIDR_SRAMSIZ_96K (14 << 16) +#define AT91_CIDR_SRAMSIZ_512K (15 << 16) +#define AT91_CIDR_ARCH (0xff << 20) /* Architecture Id */ +#define AT91_CIDR_NVPTYP (7 << 28) /* Nonvolatile Program + Memory Type */ +#define AT91_CIDR_EXT (1 << 31) /* Extension Flag */ + +#endif diff --git a/arch/arm/include/asm/arch-at91/cpu.h b/arch/arm/include/asm/arch-at91/cpu.h new file mode 100644 index 0000000..b5e5715 --- /dev/null +++ b/arch/arm/include/asm/arch-at91/cpu.h @@ -0,0 +1,99 @@ +/* + * include/asm-arm/arch-at91/cpu.h + * + * Copyright (C) 2006 SAN People + * + * 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. + * + */ + +#ifndef __ASM_ARCH_CPU_H +#define __ASM_ARCH_CPU_H + +#include <asm/hardware.h> +#include <asm/arch/at91_dbgu.h> +#include <asm/arch/io.h> + + +#define ARCH_ID_AT91RM9200 0x09290780 +#define ARCH_ID_AT91SAM9260 0x019803a0 +#define ARCH_ID_AT91SAM9261 0x019703a0 +#define ARCH_ID_AT91SAM9263 0x019607a0 +#define ARCH_ID_AT91SAM9RL64 0x019b03a0 +#define ARCH_ID_AT91CAP9 0x039A03A0 + +#define ARCH_ID_AT91SAM9XE128 0x329973a0 +#define ARCH_ID_AT91SAM9XE256 0x329a93a0 +#define ARCH_ID_AT91SAM9XE512 0x329aa3a0 + +#define ARCH_ID_AT91M40800 0x14080044 +#define ARCH_ID_AT91R40807 0x44080746 +#define ARCH_ID_AT91M40807 0x14080745 +#define ARCH_ID_AT91R40008 0x44000840 + +static inline unsigned long at91_cpu_identify(void) +{ + return (at91_sys_read(AT91_DBGU_CIDR) & ~AT91_CIDR_VERSION); +} + + +#define ARCH_FAMILY_AT91X92 0x09200000 +#define ARCH_FAMILY_AT91SAM9 0x01900000 +#define ARCH_FAMILY_AT91SAM9XE 0x02900000 + +static inline unsigned long at91_arch_identify(void) +{ + return (at91_sys_read(AT91_DBGU_CIDR) & AT91_CIDR_ARCH); +} + + +#ifdef CONFIG_AT91RM9200 +/* no actual detection for this architecture */ +#define cpu_is_at91rm9200() (1) +#else +#define cpu_is_at91rm9200() (0) +#endif + +#ifdef CONFIG_AT91SAM9261 +#define cpu_is_at91sam9xe() (at91_arch_identify() == ARCH_FAMILY_AT91SAM9XE) +#define cpu_is_at91sam9260() ((at91_cpu_identify() == ARCH_ID_AT91SAM9260) \ + || cpu_is_at91sam9xe()) +#else +#define cpu_is_at91sam9xe() (0) +#define cpu_is_at91sam9260() (0) +#endif + +#ifdef CONFIG_AT91SAM9261 +#define cpu_is_at91sam9261() (at91_cpu_identify() == ARCH_ID_AT91SAM9261) +#else +#define cpu_is_at91sam9261() (0) +#endif + +#ifdef CONFIG_AT91SAM9261 +#define cpu_is_at91sam9263() (at91_cpu_identify() == ARCH_ID_AT91SAM9263) +#else +#define cpu_is_at91sam9263() (0) +#endif + +#ifdef CONFIG_AT91SAM9RL +#define cpu_is_at91sam9rl() (at91_cpu_identify() == ARCH_ID_AT91SAM9RL64) +#else +#define cpu_is_at91sam9rl() (0) +#endif + +#ifdef CONFIG_AT91CAP9 +#define cpu_is_at91cap9() (at91_cpu_identify() == ARCH_ID_AT91CAP9) +#else +#define cpu_is_at91cap9() (0) +#endif + +/* + * Since this is ARM, we will never run on any AVR32 CPU. But these + * definitions may reduce clutter in common drivers. + */ +#define cpu_is_at32ap7000() (0) + +#endif diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile index 9b1b55b..27e7f40 100644 --- a/drivers/usb/gadget/Makefile +++ b/drivers/usb/gadget/Makefile @@ -37,6 +37,7 @@ COBJS-$(CONFIG_SPEARUDC) += spr_udc.o endif # new USB gadget layer dependencies COBJS-$(CONFIG_USB_ETHER) += ether.o epautoconf.o config.o usbstring.o +COBJS-$(CONFIG_USB_GADGET_AT91) += at91_udc.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c new file mode 100644 index 0000000..ef9bbc0 --- /dev/null +++ b/drivers/usb/gadget/at91_udc.c @@ -0,0 +1,1553 @@ +/* + * at91_udc -- driver for at91-series USB peripheral controller + * + * Copyright (C) 2004 by Thomas Rathbone + * Copyright (C) 2005 by HP Labs + * Copyright (C) 2005 by David Brownell + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +//#define DEBUG 1 +//#define VERBOSE 1 +//#define PACKET_TRACE 1 + +#include <common.h> +#include <asm/errno.h> +#include <linux/list.h> + +#include <asm/arch/cpu.h> +#include <asm/arch/at91_pmc.h> +#include <asm/arch/at91sam9261_matrix.h> + +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> + +#include <asm/byteorder.h> +#include <asm/hardware.h> +#include <asm/io.h> +#include <asm/proc-armv/system.h> +#include <asm/mach-types.h> + +#include <asm/arch/gpio.h> + +#define __iomem + +#include <usb/at91_udc.h> + + +/* + * This controller is simple and PIO-only. It's used in many AT91-series + * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), + * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. + * + * This driver expects the board has been wired with two GPIOs suppporting + * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the + * testing hasn't covered such cases.) + * + * The pullup is most important (so it's integrated on sam926x parts). It + * provides software control over whether the host enumerates the device. + * + * The VBUS sensing helps during enumeration, and allows both USB clocks + * (and the transceiver) to stay gated off until they're necessary, saving + * power. During USB suspend, the 48 MHz clock is gated off in hardware; + * it may also be gated off by software during some Linux sleep states. + */ + +#define DRIVER_VERSION "3 May 2006" + +static const char driver_name[] = "at91_udc"; +static const char ep0name[] = "ep0"; + + +#define at91_udp_read(dev, reg) \ + __raw_readl((dev)->udp_baseaddr + (reg)) +#define at91_udp_write(dev, reg, val) \ + __raw_writel((val), (dev)->udp_baseaddr + (reg)) + +/*============================================================================*/ +#define REQ_COUNT 8 +#define MAX_REQ (REQ_COUNT-1) +static struct at91_request req_pool[REQ_COUNT]; + +static void init_requests(void) +{ + int i; + + for (i = 0; i < MAX_REQ; i++) { + req_pool[i].in_use=0; + } +} + +static void free_request(struct at91_request* ptr) +{ + if (ptr < &req_pool[0] && ptr > &req_pool[REQ_COUNT]){ + printf("%s: ptr 0x%p does not specify valid req\n", \ + __func__, ptr); + if (!(ptr->in_use)) + printf("%s: ptr not marked as "in_use"\n", __func__); + + hang(); + } + ptr->in_use=0; +} + +static struct at91_request* alloc_request(void) +{ + int i; + struct at91_request* ptr=NULL; + + for (i = 0; i < MAX_REQ; i++) { + if (!req_pool[i].in_use) { + ptr=&req_pool[i]; + req_pool[i].in_use=1; + DBG("alloc_req: request[%d]\n",i); + break; + } + } + if (!ptr) + DBG("panic: no more free req buffers\n"); + return ptr; +} + +/*-------------------------------------------------------------------------*/ + +static void done(struct at91_ep *ep, struct at91_request *req, int status) +{ + unsigned stopped = ep->stopped; + struct at91_udc *udc = ep->udc; + + list_del_init(&req->queue); + if (req->req.status == -EINPROGRESS) + req->req.status = status; + else + status = req->req.status; + if (status && status != -ESHUTDOWN) + VDBG("%s done %p, status %d\n", ep->ep.name, req, status); + + ep->stopped = 1; + req->req.complete(&ep->ep, &req->req); + ep->stopped = stopped; + + /* ep0 is always ready; other endpoints need a non-empty queue */ + if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) + at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask); +} + +/*-------------------------------------------------------------------------*/ + +/* bits indicating OUT fifo has data ready */ +#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) + +/* + * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write + * back most of the value you just read (because of side effects, including + * bits that may change after reading and before writing). + * + * Except when changing a specific bit, always write values which: + * - clear SET_FX bits (setting them could change something) + * - set CLR_FX bits (clearing them could change something) + * + * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE + * that shouldn't normally be changed. + * + * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, + * implying a need to wait for one write to complete (test relevant bits) + * before starting the next write. This shouldn't be an issue given how + * infrequently we write, except maybe for write-then-read idioms. + */ +#define SET_FX (AT91_UDP_TXPKTRDY) +#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ + | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) + +/* pull OUT packet data from the endpoint's fifo */ +static int read_fifo (struct at91_ep *ep, struct at91_request *req) +{ + u32 __iomem *creg = ep->creg; + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + u32 csr; + u8 *buf; + unsigned int count, bufferspace, is_done; + + buf = req->req.buf + req->req.actual; + bufferspace = req->req.length - req->req.actual; + + /* + * there might be nothing to read if ep_queue() calls us, + * or if we already emptied both pingpong buffers + */ +rescan: + csr = __raw_readl(creg); + if ((csr & RX_DATA_READY) == 0) + return 0; + + count = (csr & AT91_UDP_RXBYTECNT) >> 16; + if (count > ep->ep.maxpacket) + count = ep->ep.maxpacket; + if (count > bufferspace) { + DBG("%s buffer overflow\n", ep->ep.name); + req->req.status = -EOVERFLOW; + count = bufferspace; + } + __raw_readsb((unsigned long)dreg, buf, count); + + /* release and swap pingpong mem bank */ + csr |= CLR_FX; + if (ep->is_pingpong) { + if (ep->fifo_bank == 0) { + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + ep->fifo_bank = 1; + } else { + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); + ep->fifo_bank = 0; + } + } else + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + __raw_writel(csr, creg); + + req->req.actual += count; + is_done = (count < ep->ep.maxpacket); + if (count == bufferspace) + is_done = 1; + + PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, + is_done ? " (done)" : ""); + + /* + * avoid extra trips through IRQ logic for packets already in + * the fifo ... maybe preventing an extra (expensive) OUT-NAK + */ + if (is_done) + done(ep, req, 0); + else if (ep->is_pingpong) { + bufferspace -= count; + buf += count; + goto rescan; + } + + return is_done; +} + +/* load fifo for an IN packet */ +static int write_fifo(struct at91_ep *ep, struct at91_request *req) +{ + u32 __iomem *creg = ep->creg; + u32 csr = __raw_readl(creg); + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + unsigned total, count, is_last; + + /* + * TODO: allow for writing two packets to the fifo ... that'll + * reduce the amount of IN-NAKing, but probably won't affect + * throughput much. (Unlike preventing OUT-NAKing!) + */ + + /* + * If ep_queue() calls us, the queue is empty and possibly in + * odd states like TXCOMP not yet cleared (we do it, saving at + * least one IRQ) or the fifo not yet being free. Those aren't + * issues normally (IRQ handler fast path). + */ + if (csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY)) { + if (csr & AT91_UDP_TXCOMP) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_TXCOMP); + __raw_writel(csr, creg); + csr = __raw_readl(creg); + } + if (csr & AT91_UDP_TXPKTRDY) + return 0; + } + + total = req->req.length - req->req.actual; + if (ep->ep.maxpacket < total) { + count = ep->ep.maxpacket; + is_last = 0; + } else { + count = total; + is_last = (count < ep->ep.maxpacket) || !req->req.zero; + } + + /* + * Write the packet, maybe it's a ZLP. + * + * NOTE: incrementing req->actual before we receive the ACK means + * gadget driver IN bytecounts can be wrong in fault cases. That's + * fixable with PIO drivers like this one (save "count" here, and + * do the increment later on TX irq), but not for most DMA hardware. + * + * So all gadget drivers must accept that potential error. Some + * hardware supports precise fifo status reporting, letting them + * recover when the actual bytecount matters (e.g. for USB Test + * and Measurement Class devices). + */ + + __raw_writesb((unsigned long)dreg, + req->req.buf + req->req.actual, count); + csr &= ~SET_FX; + csr |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + req->req.actual += count; + + PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, + is_last ? " (done)" : ""); + if (is_last) + done(ep, req, 0); + return is_last; +} + +static void nuke(struct at91_ep *ep, int status) +{ + struct at91_request *req; + + // terminer chaque requete dans la queue + ep->stopped = 1; + if (list_empty(&ep->queue)) + return; + + VDBG("%s %s\n", __func__, ep->ep.name); + while (!list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, struct at91_request, queue); + done(ep, req, status); + } +} + +/*-------------------------------------------------------------------------*/ + +static int at91_ep_enable(struct usb_ep *_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + struct at91_udc *dev = ep->udc; + u16 maxpacket; + u32 tmp; + unsigned long flags; + + if (!_ep || !ep + || !desc || ep->desc + || _ep->name == ep0name + || desc->bDescriptorType != USB_DT_ENDPOINT + || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0 + || maxpacket > ep->maxpacket) { + DBG("bad ep or descriptor\n"); + return -EINVAL; + } + + if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { + DBG("bogus device state\n"); + return -ESHUTDOWN; + } + + tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; + switch (tmp) { + case USB_ENDPOINT_XFER_CONTROL: + DBG("only one control endpoint\n"); + return -EINVAL; + case USB_ENDPOINT_XFER_INT: + if (maxpacket > 64) + goto bogus_max; + break; + case USB_ENDPOINT_XFER_BULK: + switch (maxpacket) { + case 8: + case 16: + case 32: + case 64: + goto ok; + } +bogus_max: + DBG("bogus maxpacket %d\n", maxpacket); + return -EINVAL; + case USB_ENDPOINT_XFER_ISOC: + if (!ep->is_pingpong) { + DBG("iso requires double buffering\n"); + return -EINVAL; + } + break; + } + +ok: + local_irq_save(flags); + + /* initialize endpoint to match this descriptor */ + ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0; + ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); + ep->stopped = 0; + if (ep->is_in) + tmp |= 0x04; + tmp <<= 8; + tmp |= AT91_UDP_EPEDS; + __raw_writel(tmp, ep->creg); + + ep->desc = desc; + ep->ep.maxpacket = maxpacket; + + /* + * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, + * since endpoint resets don't reset hw pingpong state. + */ + at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(dev, AT91_UDP_RST_EP, 0); + + local_irq_restore(flags); + return 0; +} + +static int at91_ep_disable (struct usb_ep * _ep) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + struct at91_udc *udc = ep->udc; + unsigned long flags; + + if (ep == &ep->udc->ep[0]) + return -EINVAL; + + local_irq_save(flags); + + nuke(ep, -ESHUTDOWN); + + /* restore the endpoint's pristine config */ + ep->desc = NULL; + ep->ep.maxpacket = ep->maxpacket; + + /* reset fifos and endpoint */ + if (ep->udc->clocked) { + at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(udc, AT91_UDP_RST_EP, 0); + __raw_writel(0, ep->creg); + } + + local_irq_restore(flags); + return 0; +} + +/* + * this is a PIO-only driver, so there's nothing + * interesting for request or buffer allocation. + */ + +static struct usb_request * +at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags) +{ + struct at91_request *req; + + req = alloc_request(); + + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + return &req->req; +} + +static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) +{ + struct at91_request *req; + + req = container_of(_req, struct at91_request, req); +/* TODO: + * BUG_ON(!list_empty(&req->queue)); + * kfree(req); */ + free_request(req); +} + +static int at91_ep_queue(struct usb_ep *_ep, + struct usb_request *_req, gfp_t gfp_flags) +{ + struct at91_request *req; + struct at91_ep *ep; + struct at91_udc *dev; + int status; + unsigned long flags; + + req = container_of(_req, struct at91_request, req); + ep = container_of(_ep, struct at91_ep, ep); + + if (!_req || !_req->complete + || !_req->buf || !list_empty(&req->queue)) { + DBG("invalid request\n"); + return -EINVAL; + } + + if (!_ep || (!ep->desc && ep->ep.name != ep0name)) { + DBG("invalid ep\n"); + return -EINVAL; + } + + dev = ep->udc; + + if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { + DBG("invalid device\n"); + return -EINVAL; + } + + _req->status = -EINPROGRESS; + _req->actual = 0; + + local_irq_save(flags); + + /* try to kickstart any empty and idle queue */ + if (list_empty(&ep->queue) && !ep->stopped) { + int is_ep0; + + /* + * If this control request has a non-empty DATA stage, this + * will start that stage. It works just like a non-control + * request (until the status stage starts, maybe early). + * + * If the data stage is empty, then this starts a successful + * IN/STATUS stage. (Unsuccessful ones use set_halt.) + */ + is_ep0 = (ep->ep.name == ep0name); + if (is_ep0) { + u32 tmp; + + if (!dev->req_pending) { + status = -EINVAL; + goto done; + } + + /* + * defer changing CONFG until after the gadget driver + * reconfigures the endpoints. + */ + if (dev->wait_for_config_ack) { + tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT); + tmp ^= AT91_UDP_CONFG; + VDBG("toggle config\n"); + at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp); + } + if (req->req.length == 0) { +ep0_in_status: + PACKET("ep0 in/status\n"); + status = 0; + tmp = __raw_readl(ep->creg); + tmp &= ~SET_FX; + tmp |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(tmp, ep->creg); + dev->req_pending = 0; + goto done; + } + } + + if (ep->is_in) + status = write_fifo(ep, req); + else { + status = read_fifo(ep, req); + + /* IN/STATUS stage is otherwise triggered by irq */ + if (status && is_ep0) + goto ep0_in_status; + } + } else + status = 0; + + if (req && !status) { + list_add_tail (&req->queue, &ep->queue); + } +done: + local_irq_restore(flags); + return (status < 0) ? status : 0; +} + +static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct at91_ep *ep; + struct at91_request *req; + + ep = container_of(_ep, struct at91_ep, ep); + if (!_ep || ep->ep.name == ep0name) + return -EINVAL; + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry (req, &ep->queue, queue) { + if (&req->req == _req) + break; + } + if (&req->req != _req) + return -EINVAL; + + done(ep, req, -ECONNRESET); + return 0; +} + +static int at91_ep_set_halt(struct usb_ep *_ep, int value) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + struct at91_udc *udc = ep->udc; + u32 __iomem *creg; + u32 csr; + unsigned long flags; + int status = 0; + + if (!_ep || ep->is_iso || !ep->udc->clocked) + return -EINVAL; + + creg = ep->creg; + local_irq_save(flags); + + csr = __raw_readl(creg); + + /* + * fail with still-busy IN endpoints, ensuring correct sequencing + * of data tx then stall. note that the fifo rx bytecount isn't + * completely accurate as a tx bytecount. + */ + if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) + status = -EAGAIN; + else { + csr |= CLR_FX; + csr &= ~SET_FX; + if (value) { + csr |= AT91_UDP_FORCESTALL; + VDBG("halt %s\n", ep->ep.name); + } else { + at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(udc, AT91_UDP_RST_EP, 0); + csr &= ~AT91_UDP_FORCESTALL; + } + __raw_writel(csr, creg); + } + + local_irq_restore(flags); + return status; +} + +static const struct usb_ep_ops at91_ep_ops = { + .enable = at91_ep_enable, + .disable = at91_ep_disable, + .alloc_request = at91_ep_alloc_request, + .free_request = at91_ep_free_request, + .queue = at91_ep_queue, + .dequeue = at91_ep_dequeue, + .set_halt = at91_ep_set_halt, + // there's only imprecise fifo status reporting +}; + +/*-------------------------------------------------------------------------*/ + +static int at91_get_frame(struct usb_gadget *gadget) +{ + struct at91_udc *udc = to_udc(gadget); + + if (!to_udc(gadget)->clocked) + return -EINVAL; + return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM; +} + +static int at91_wakeup(struct usb_gadget *gadget) +{ + struct at91_udc *udc = to_udc(gadget); + u32 glbstate; + int status = -EINVAL; + unsigned long flags; + + DBG("%s\n", __func__ ); + local_irq_save(flags); + + if (!udc->clocked || !udc->suspended) + goto done; + + /* NOTE: some "early versions" handle ESR differently ... */ + + glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT); + if (!(glbstate & AT91_UDP_ESR)) + goto done; + glbstate |= AT91_UDP_ESR; + at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate); + +done: + local_irq_restore(flags); + return status; +} + +/* reinit == restore inital software state */ +static void udc_reinit(struct at91_udc *udc) +{ + u32 i; + + INIT_LIST_HEAD(&udc->gadget.ep_list); + INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); + + for (i = 0; i < NUM_ENDPOINTS; i++) { + struct at91_ep *ep = &udc->ep[i]; + + if (i != 0) + list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); + ep->desc = NULL; + ep->stopped = 0; + ep->fifo_bank = 0; + ep->ep.maxpacket = ep->maxpacket; + ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i); + // initialiser une queue par endpoint + INIT_LIST_HEAD(&ep->queue); + } +} + +static void stop_activity(struct at91_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_UNKNOWN; + udc->suspended = 0; + + for (i = 0; i < NUM_ENDPOINTS; i++) { + struct at91_ep *ep = &udc->ep[i]; + ep->stopped = 1; + nuke(ep, -ESHUTDOWN); + } + if (driver) + driver->disconnect(&udc->gadget); + + udc_reinit(udc); +} + +static inline void clk_enable(unsigned id) +{ + at91_sys_write(AT91_PMC_PCER, 1 << id); +} + +static inline void clk_disable(unsigned id) +{ + at91_sys_write(AT91_PMC_PCER, 1 << id); +} + +static void clk_on(struct at91_udc *udc) +{ + if (udc->clocked) + return; + udc->clocked = 1; + clk_enable(udc->iclk); + /*clk_enable(udc->fclk);*/ +} + +static void clk_off(struct at91_udc *udc) +{ + if (!udc->clocked) + return; + udc->clocked = 0; + udc->gadget.speed = USB_SPEED_UNKNOWN; + + /*clk_disable(udc->fclk);*/ + clk_disable(udc->iclk); +} + +#define VBUS_DOWNTIME 5 /* seconds */ +/* + * activate/deactivate link with host; minimize power usage for + * inactive links by cutting clocks and transceiver power. + */ +static void pullup(struct at91_udc *udc, int is_on) +{ + static int last_pulldown, pulledup_once; + if (!udc->enabled || !udc->vbus) + is_on = 0; + + if (is_on) { + /* + * We need to slow down the pullup/pulldown sequence. + * between pull-down and up at least 5 seconds time is + * required, Windows cannot keep up properly. + */ + if (last_pulldown) { + ulong last = 0, time = get_timer(last_pulldown); + printf("Holding VBUS down: "); + while (time < (VBUS_DOWNTIME * CONFIG_SYS_HZ)) { + if (((time % CONFIG_SYS_HZ) == 0) && + (last != time)) { + printf("%lu...", + VBUS_DOWNTIME - + (time / CONFIG_SYS_HZ)); + last = time; + } + time = get_timer(last_pulldown); + } + printf("Go!\n"); + } + + clk_on(udc); + at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); + at91_udp_write(udc, AT91_UDP_TXVC, 0); + if (cpu_is_at91rm9200()) + at91_set_gpio_value(udc->board.pullup_pin, 1); + else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) { + u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); + + txvc |= AT91_UDP_TXVC_PUON; + at91_udp_write(udc, AT91_UDP_TXVC, txvc); + } else if (cpu_is_at91sam9261()) { + u32 usbpucr; + + usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR); + usbpucr |= AT91_MATRIX_USBPUCR_PUON; + at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr); + } + pulledup_once = 1; + } else { + stop_activity(udc); + at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); + at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); + if (cpu_is_at91rm9200()) + at91_set_gpio_value(udc->board.pullup_pin, 0); + else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) { + u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC); + + txvc &= ~AT91_UDP_TXVC_PUON; + at91_udp_write(udc, AT91_UDP_TXVC, txvc); + } else if (cpu_is_at91sam9261()) { + u32 usbpucr; + + usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR); + usbpucr &= ~AT91_MATRIX_USBPUCR_PUON; + at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr); + } + clk_off(udc); + + /* Only interesting if it has been pulled up once. */ + if (pulledup_once) + last_pulldown = get_timer(0); + } +} + +/* vbus is here! turn everything on that's ready */ +static int at91_vbus_session(struct usb_gadget *gadget, int is_active) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + /* VDBG("vbus %s\n", is_active ? "on" : "off"); */ + local_irq_save(flags); + if (udc->driver) { + udc->vbus = (is_active != 0); + pullup(udc, is_active); + } + + local_irq_restore(flags); + return 0; +} + +static int at91_pullup(struct usb_gadget *gadget, int is_on) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + local_irq_save(flags); + udc->enabled = is_on = !!is_on; + pullup(udc, is_on); + local_irq_restore(flags); + return 0; +} + +static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + local_irq_save(flags); + udc->selfpowered = (is_on != 0); + local_irq_restore(flags); + return 0; +} + +static const struct usb_gadget_ops at91_udc_ops = { + .get_frame = at91_get_frame, + .wakeup = at91_wakeup, + .set_selfpowered = at91_set_selfpowered, + .vbus_session = at91_vbus_session, + .pullup = at91_pullup, + + /* + * VBUS-powered devices may also also want to support bigger + * power budgets after an appropriate SET_CONFIGURATION. + */ + // .vbus_power = at91_vbus_power, +}; + +/*-------------------------------------------------------------------------*/ + +static int handle_ep(struct at91_ep *ep) +{ + struct at91_request *req; + u32 __iomem *creg = ep->creg; + u32 csr = __raw_readl(creg); + + if (!list_empty(&ep->queue)) + req = list_entry(ep->queue.next, + struct at91_request, queue); + else + req = NULL; + + if (ep->is_in) { + if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); + __raw_writel(csr, creg); + } + if (req) + return write_fifo(ep, req); + + } else { + if (csr & AT91_UDP_STALLSENT) { + /* STALLSENT bit == ISOERR */ + if (ep->is_iso && req) + req->req.status = -EILSEQ; + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT); + __raw_writel(csr, creg); + csr = __raw_readl(creg); + } + if (req && (csr & RX_DATA_READY)) + return read_fifo(ep, req); + } + return 0; +} + +union setup { + u8 raw[8]; + struct usb_ctrlrequest r; +}; + +static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) +{ + u32 __iomem *creg = ep->creg; + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + unsigned rxcount, i = 0; + u32 tmp; + union setup pkt; + int status = 0; + + /* read and ack SETUP; hard-fail for bogus packets */ + rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; + if (rxcount == 8) { + while (rxcount--) + pkt.raw[i++] = __raw_readb(dreg); + if (pkt.r.bRequestType & USB_DIR_IN) { + csr |= AT91_UDP_DIR; + ep->is_in = 1; + } else { + csr &= ~AT91_UDP_DIR; + ep->is_in = 0; + } + } else { + // REVISIT this happens sometimes under load; why?? + printf("error: SETUP len %d, csr %08x\n", rxcount, csr); + status = -EINVAL; + } + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_RXSETUP); + __raw_writel(csr, creg); + udc->wait_for_addr_ack = 0; + udc->wait_for_config_ack = 0; + ep->stopped = 0; + if (status != 0) + goto stall; + +#define w_index le16_to_cpu(pkt.r.wIndex) +#define w_value le16_to_cpu(pkt.r.wValue) +#define w_length le16_to_cpu(pkt.r.wLength) + + VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", + pkt.r.bRequestType, pkt.r.bRequest, + w_value, w_index, w_length); + + /* + * A few standard requests get handled here, ones that touch + * hardware ... notably for device and endpoint features. + */ + udc->req_pending = 1; + csr = __raw_readl(creg); + csr |= CLR_FX; + csr &= ~SET_FX; + switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { + + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_ADDRESS: + __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); + udc->addr = w_value; + udc->wait_for_addr_ack = 1; + udc->req_pending = 0; + /* FADDR is set later, when we ack host STATUS */ + return; + + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_CONFIGURATION: + tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; + if (pkt.r.wValue) + udc->wait_for_config_ack = (tmp == 0); + else + udc->wait_for_config_ack = (tmp != 0); + if (udc->wait_for_config_ack) + VDBG("wait for config\n"); + /* CONFG is toggled later, if gadget driver succeeds */ + break; + + /* + * Hosts may set or clear remote wakeup status, and + * devices may report they're VBUS powered. + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_GET_STATUS: + tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); + if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR) + tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); + PACKET("get device status\n"); + __raw_writeb(tmp, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_FEATURE: + if (w_value != USB_DEVICE_REMOTE_WAKEUP) + goto stall; + tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); + tmp |= AT91_UDP_ESR; + at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); + goto succeed; + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_CLEAR_FEATURE: + if (w_value != USB_DEVICE_REMOTE_WAKEUP) + goto stall; + tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); + tmp &= ~AT91_UDP_ESR; + at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); + goto succeed; + + /* + * Interfaces have no feature settings; this is pretty useless. + * we won't even insist the interface exists... + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_GET_STATUS: + PACKET("get interface status\n"); + __raw_writeb(0, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_SET_FEATURE: + case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_CLEAR_FEATURE: + goto stall; + + /* + * Hosts may clear bulk/intr endpoint halt after the gadget + * driver sets it (not widely used); or set it (for testing) + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_GET_STATUS: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc)) + goto stall; + + if (tmp) { + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + } + PACKET("get %s status\n", ep->ep.name); + if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) + tmp = (1 << USB_ENDPOINT_HALT); + else + tmp = 0; + __raw_writeb(tmp, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_SET_FEATURE: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) + goto stall; + if (!ep->desc || ep->is_iso) + goto stall; + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + + tmp = __raw_readl(ep->creg); + tmp &= ~SET_FX; + tmp |= CLR_FX | AT91_UDP_FORCESTALL; + __raw_writel(tmp, ep->creg); + goto succeed; + case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_CLEAR_FEATURE: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS) + goto stall; + if (tmp == 0) + goto succeed; + if (!ep->desc || ep->is_iso) + goto stall; + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + + at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(udc, AT91_UDP_RST_EP, 0); + tmp = __raw_readl(ep->creg); + tmp |= CLR_FX; + tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); + __raw_writel(tmp, ep->creg); + if (!list_empty(&ep->queue)) + handle_ep(ep); + goto succeed; + } + +#undef w_value +#undef w_index +#undef w_length + + /* pass request up to the gadget driver */ + if (udc->driver) + status = udc->driver->setup(&udc->gadget, &pkt.r); + else + status = -ENODEV; + if (status < 0) { +stall: + VDBG("req %02x.%02x protocol STALL; stat %d\n", + pkt.r.bRequestType, pkt.r.bRequest, status); + csr |= AT91_UDP_FORCESTALL; + __raw_writel(csr, creg); + udc->req_pending = 0; + } + return; + +succeed: + /* immediate successful (IN) STATUS after zero length DATA */ + PACKET("ep0 in/status\n"); +write_in: + csr |= AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + udc->req_pending = 0; + return; +} + +static void handle_ep0(struct at91_udc *udc) +{ + struct at91_ep *ep0 = &udc->ep[0]; + u32 __iomem *creg = ep0->creg; + u32 csr = __raw_readl(creg); + struct at91_request *req; + +// VDBG("%s\n",__func__); + + if (csr & AT91_UDP_STALLSENT) { + nuke(ep0, -EPROTO); + udc->req_pending = 0; + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); + __raw_writel(csr, creg); + VDBG("ep0 stalled\n"); + csr = __raw_readl(creg); + } + if (csr & AT91_UDP_RXSETUP) { + nuke(ep0, 0); + udc->req_pending = 0; + handle_setup(udc, ep0, csr); + return; + } + + if (list_empty(&ep0->queue)) + req = NULL; + else + req = list_entry(ep0->queue.next, struct at91_request, queue); + + /* host ACKed an IN packet that we sent */ + if (csr & AT91_UDP_TXCOMP) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_TXCOMP); + + /* write more IN DATA? */ + if (req && ep0->is_in) { + if (handle_ep(ep0)) + udc->req_pending = 0; + + /* + * Ack after: + * - last IN DATA packet (including GET_STATUS) + * - IN/STATUS for OUT DATA + * - IN/STATUS for any zero-length DATA stage + * except for the IN DATA case, the host should send + * an OUT status later, which we'll ack. + */ + } else { + udc->req_pending = 0; + __raw_writel(csr, creg); + + /* + * SET_ADDRESS takes effect only after the STATUS + * (to the original address) gets acked. + */ + if (udc->wait_for_addr_ack) { + u32 tmp; + + at91_udp_write(udc, AT91_UDP_FADDR, + AT91_UDP_FEN | udc->addr); + tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT); + tmp &= ~AT91_UDP_FADDEN; + if (udc->addr) + tmp |= AT91_UDP_FADDEN; + at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp); + + udc->wait_for_addr_ack = 0; + VDBG("address %d\n", udc->addr); + } + } + } + + /* OUT packet arrived ... */ + else if (csr & AT91_UDP_RX_DATA_BK0) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + + /* OUT DATA stage */ + if (!ep0->is_in) { + if (req) { + if (handle_ep(ep0)) { + /* send IN/STATUS */ + PACKET("ep0 in/status\n"); + csr = __raw_readl(creg); + csr &= ~SET_FX; + csr |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + udc->req_pending = 0; + } + } else if (udc->req_pending) { + /* + * AT91 hardware has a hard time with this + * "deferred response" mode for control-OUT + * transfers. (For control-IN it's fine.) + * + * The normal solution leaves OUT data in the + * fifo until the gadget driver is ready. + * We couldn't do that here without disabling + * the IRQ that tells about SETUP packets, + * e.g. when the host gets impatient... + * + * Working around it by copying into a buffer + * would almost be a non-deferred response, + * except that it wouldn't permit reliable + * stalling of the request. Instead, demand + * that gadget drivers not use this mode. + */ + DBG("no control-OUT deferred responses!\n"); + __raw_writel(csr | AT91_UDP_FORCESTALL, creg); + udc->req_pending = 0; + } + + /* STATUS stage for control-IN; ack. */ + } else { + PACKET("ep0 out/status ACK\n"); + __raw_writel(csr, creg); + + /* "early" status stage */ + if (req) + done(ep0, req, 0); + } + } +} + +static void at91_udc_irq (int irq, void *_udc) +{ + struct at91_udc *udc = _udc; + u32 rescans = 5; + + while (rescans--) { + u32 status; + + status = at91_udp_read(udc, AT91_UDP_ISR); + if (!status) + break; + + /* USB reset irq: not maskable */ + if (status & AT91_UDP_ENDBUSRES) { + at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); + /* Atmel code clears this irq twice */ + at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); + at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES); + VDBG("end bus reset\n"); + udc->addr = 0; + stop_activity(udc); + + /* enable ep0 */ + at91_udp_write(udc, AT91_UDP_CSR(0), + AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); + udc->gadget.speed = USB_SPEED_FULL; + udc->suspended = 0; + + /* + * NOTE: this driver keeps clocks off unless the + * USB host is present. That saves power, but for + * boards that don't support VBUS detection, both + * clocks need to be active most of the time. + */ + + /* host initiated suspend (3+ms bus idle) */ + } else if (status & AT91_UDP_RXSUSP) { + at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP); + /* at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM); */ + at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP); + /* VDBG("bus suspend\n"); */ + if (udc->suspended) + continue; + udc->suspended = 1; + + /* + * NOTE: when suspending a VBUS-powered device, the + * gadget driver should switch into slow clock mode + * and then into standby to avoid drawing more than + * 500uA power (2500uA for some high-power configs). + */ + if (udc->driver && udc->driver->suspend) + udc->driver->suspend(&udc->gadget); + + /* host initiated resume */ + } else if (status & AT91_UDP_RXRSM) { + at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM); + /*at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);*/ + at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM); + /* VDBG("bus resume\n"); */ + if (!udc->suspended) + continue; + udc->suspended = 0; + + /* + * NOTE: for a VBUS-powered device, the gadget driver + * would normally want to switch out of slow clock + * mode into normal mode. + */ + if (udc->driver && udc->driver->resume) + udc->driver->resume(&udc->gadget); + + /* endpoint IRQs are cleared by handling them */ + } else { + int i; + unsigned mask = 1; + struct at91_ep *ep = &udc->ep[1]; + + if (status & mask) + handle_ep0(udc); + for (i = 1; i < NUM_ENDPOINTS; i++) { + mask <<= 1; + if (status & mask) + handle_ep(ep); + ep++; + } + } + } +} + +/*-------------------------------------------------------------------------*/ + +static struct at91_udc controller = { + .udp_baseaddr = (unsigned *) CFG_USBD_REGS_BASE, + .gadget = { + .ops = &at91_udc_ops, + .ep0 = &controller.ep[0].ep, + .name = driver_name, + }, + .ep[0] = { + .ep = { + .name = ep0name, + .ops = &at91_ep_ops, + }, + .udc = &controller, + .maxpacket = 8, + .int_mask = 1 << 0, + }, + .ep[1] = { + .ep = { + .name = "ep1", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 64, + .int_mask = 1 << 1, + }, + .ep[2] = { + .ep = { + .name = "ep2", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 64, + .int_mask = 1 << 2, + }, + .ep[3] = { + .ep = { + /* could actually do bulk too */ + .name = "ep3-int", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .maxpacket = 8, + .int_mask = 1 << 3, + }, + .ep[4] = { + .ep = { + .name = "ep4", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 256, + .int_mask = 1 << 4, + }, + .ep[5] = { + .ep = { + .name = "ep5", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 256, + .int_mask = 1 << 5, + }, + /* ep6 and ep7 are also reserved (custom silicon might use them) */ +}; + +int usb_gadget_handle_interrupts(void) +{ + struct at91_udc *udc = &controller; + u32 value; + + value = at91_udp_read(udc, AT91_UDP_ISR) & (~(AT91_UDP_SOFINT)); + if (value) + at91_udc_irq(0, udc); + + return (value); +} + +int usb_gadget_register_driver (struct usb_gadget_driver *driver) +{ + struct at91_udc *udc = &controller; + int retval; + unsigned value; + + if (!driver + || driver->speed < USB_SPEED_FULL + || !driver->bind + || !driver->setup) { + DBG("bad parameter.\n"); + return -EINVAL; + } + + if (udc->driver) { + DBG("UDC already has a gadget driver\n"); + return -EBUSY; + } + + udc->driver = driver; + udc->enabled = 1; + udc->selfpowered = 1; + + + retval = driver->bind(&udc->gadget); + if (retval) { + DBG("driver->bind() returned %d\n", retval); + udc->driver = NULL; + udc->enabled = 0; + udc->selfpowered = 0; + return retval; + } + + /* todo: anyway allow registering the driver, maybe a later + * bringup may succeed. postpone pullup the eth_init? + */ + + //check vbus + value = at91_get_gpio_value(udc->board.vbus_pin); + + if (!value) { + //todo: cleanup + printf("no USB host connected...\n"); + return -EAGAIN; + } + udc->vbus=1; + + + DBG("bound to %s\n", driver_name); + return 0; +} + +int at91udc_probe(struct platform_data *pdata) +{ + struct at91_udc *udc; + int retval; + + if (!pdata) { + DBG("missing platform_data\n"); + return -ENODEV; + } + + /* init software state */ + udc = &controller; + //udc->gadget.dev.parent = dev; + udc->board = pdata->board; + udc->enabled = 0; + + init_requests(); + + udc_reinit(udc); + + /* get interface and function clocks */ + udc->iclk = pdata->udc_clk; + if (!udc->iclk) { + DBG("clocks missing\n"); + retval = -ENODEV; + goto fail0; + } + + /* don't do anything until we have both gadget driver and VBUS */ + clk_enable(udc->iclk); + at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); + at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); + /* Clear all pending interrupts - UDP may be used by bootloader. */ + at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); + clk_disable(udc->iclk); + + if (udc->board.vbus_pin > 0) { + /* + * Get the initial state of VBUS - we cannot expect + * a pending interrupt. + */ + udc->vbus = at91_get_gpio_value(udc->board.vbus_pin); + DBG("VBUS detection: host:%s \n", + udc->vbus ? "present":"absent"); + } else { + DBG("no VBUS detection, assuming always-on\n"); + udc->vbus = 1; + } + return 0; + +fail0: + printf("probe failed, %d\n", retval); + return retval; +} diff --git a/include/usb/at91_udc.h b/include/usb/at91_udc.h new file mode 100644 index 0000000..6ce4dd7 --- /dev/null +++ b/include/usb/at91_udc.h @@ -0,0 +1,209 @@ +/* + * Copyright (C) 2004 by Thomas Rathbone, HP Labs + * Copyright (C) 2005 by Ivan Kokshaysky + * Copyright (C) 2006 by SAN People + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef AT91_UDC_H +#define AT91_UDC_H + +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/list.h> + + +#define __iomem + +/* + * USB Device Port (UDP) registers. + * Based on AT91RM9200 datasheet revision E. + */ + +#define AT91_UDP_FRM_NUM 0x00 /* Frame Number Register */ +#define AT91_UDP_NUM (0x7ff << 0) /* Frame Number */ +#define AT91_UDP_FRM_ERR (1 << 16) /* Frame Error */ +#define AT91_UDP_FRM_OK (1 << 17) /* Frame OK */ + +#define AT91_UDP_GLB_STAT 0x04 /* Global State Register */ +#define AT91_UDP_FADDEN (1 << 0) /* Function Address Enable */ +#define AT91_UDP_CONFG (1 << 1) /* Configured */ +#define AT91_UDP_ESR (1 << 2) /* Enable Send Resume */ +#define AT91_UDP_RSMINPR (1 << 3) /* Resume has been sent */ +#define AT91_UDP_RMWUPE (1 << 4) /* Remote Wake Up Enable */ + +#define AT91_UDP_FADDR 0x08 /* Function Address Register */ +#define AT91_UDP_FADD (0x7f << 0) /* Function Address Value */ +#define AT91_UDP_FEN (1 << 8) /* Function Enable */ + +#define AT91_UDP_IER 0x10 /* Interrupt Enable Register */ +#define AT91_UDP_IDR 0x14 /* Interrupt Disable Register */ +#define AT91_UDP_IMR 0x18 /* Inte:rrupt Mask Register */ + +#define AT91_UDP_ISR 0x1c /* Interrupt Status Register */ +#define AT91_UDP_EP(n) (1 << (n)) /* Endpoint Interrupt Status */ +#define AT91_UDP_RXSUSP (1 << 8) /* USB Suspend Interrupt Status */ +#define AT91_UDP_RXRSM (1 << 9) /* USB Resume Interrupt Status */ +#define AT91_UDP_EXTRSM (1 << 10) /* External Resume Interrupt Status [AT91RM9200 only] */ +#define AT91_UDP_SOFINT (1 << 11) /* Start of Frame Interrupt Status */ +#define AT91_UDP_ENDBUSRES (1 << 12) /* End of Bus Reset Interrpt Status */ +#define AT91_UDP_WAKEUP (1 << 13) /* USB Wakeup Interrupt Status [AT91RM9200 only] */ + +#define AT91_UDP_ICR 0x20 /* Interrupt Clear Register */ +#define AT91_UDP_RST_EP 0x28 /* Reset Endpoint Register */ + +#define AT91_UDP_CSR(n) (0x30+((n)*4)) /* Endpoint Control/Status Registers 0-7 */ +#define AT91_UDP_TXCOMP (1 << 0) /* Generates IN packet with data previously written in DPR */ +#define AT91_UDP_RX_DATA_BK0 (1 << 1) /* Receive Data Bank 0 */ +#define AT91_UDP_RXSETUP (1 << 2) /* Send STALL to the host */ +#define AT91_UDP_STALLSENT (1 << 3) /* Stall Sent / Isochronous error (Isochronous endpoints) */ +#define AT91_UDP_TXPKTRDY (1 << 4) /* Transmit Packet Ready */ +#define AT91_UDP_FORCESTALL (1 << 5) /* Force Stall */ +#define AT91_UDP_RX_DATA_BK1 (1 << 6) /* Receive Data Bank 1 */ +#define AT91_UDP_DIR (1 << 7) /* Transfer Direction */ +#define AT91_UDP_EPTYPE (7 << 8) /* Endpoint Type */ +#define AT91_UDP_EPTYPE_CTRL (0 << 8) +#define AT91_UDP_EPTYPE_ISO_OUT (1 << 8) +#define AT91_UDP_EPTYPE_BULK_OUT (2 << 8) +#define AT91_UDP_EPTYPE_INT_OUT (3 << 8) +#define AT91_UDP_EPTYPE_ISO_IN (5 << 8) +#define AT91_UDP_EPTYPE_BULK_IN (6 << 8) +#define AT91_UDP_EPTYPE_INT_IN (7 << 8) +#define AT91_UDP_DTGLE (1 << 11) /* Data Toggle */ +#define AT91_UDP_EPEDS (1 << 15) /* Endpoint Enable/Disable */ +#define AT91_UDP_RXBYTECNT (0x7ff << 16) /* Number of bytes in FIFO */ + +#define AT91_UDP_FDR(n) (0x50+((n)*4)) /* Endpoint FIFO Data Registers 0-7 */ + +#define AT91_UDP_TXVC 0x74 /* Transceiver Control Register */ +#define AT91_UDP_TXVC_TXVDIS (1 << 8) /* Transceiver Disable */ +#define AT91_UDP_TXVC_PUON (1 << 9) /* PullUp On [AT91SAM9260 only] */ + +/*-------------------------------------------------------------------------*/ + +/* + * controller driver data structures + */ + +#define NUM_ENDPOINTS 6 + +/* + * hardware won't disable bus reset, or resume while the controller + * is suspended ... watching suspend helps keep the logic symmetric. + */ +#define MINIMUS_INTERRUPTUS \ + (AT91_UDP_ENDBUSRES | AT91_UDP_RXRSM | AT91_UDP_RXSUSP) + +struct at91_ep { + struct usb_ep ep; + struct list_head queue; + struct at91_udc *udc; + void __iomem *creg; + + unsigned maxpacket:16; + u8 int_mask; + unsigned is_pingpong:1; + + unsigned stopped:1; + unsigned is_in:1; + unsigned is_iso:1; + unsigned fifo_bank:1; + + const struct usb_endpoint_descriptor + *desc; +}; + +/* USB Device */ +struct at91_udc_data { + u8 vbus_pin; /* high == host powering us */ + u8 pullup_pin; /* high == D+ pulled up */ +}; + +struct platform_data { + struct at91_udc_data board; + unsigned udc_clk; +}; + +/* + * driver is non-SMP, and just blocks IRQs whenever it needs + * access protection for chip registers or driver state + */ +struct at91_udc { + struct usb_gadget gadget; + struct at91_ep ep[NUM_ENDPOINTS]; + struct usb_gadget_driver *driver; + unsigned vbus:1; + unsigned enabled:1; + unsigned clocked:1; + unsigned suspended:1; + unsigned req_pending:1; + unsigned wait_for_addr_ack:1; + unsigned wait_for_config_ack:1; + unsigned selfpowered:1; + unsigned active_suspend:1; + u8 addr; + struct at91_udc_data board; + unsigned iclk; + void __iomem *udp_baseaddr; + int udp_irq; +}; + +static inline struct at91_udc *to_udc(struct usb_gadget *g) +{ + return container_of(g, struct at91_udc, gadget); +} + +struct at91_request { + struct usb_request req; + struct list_head queue; + unsigned in_use; +}; + +/* udc_disconnect + * + * Disconnect is not used but, is included for completeness + */ +void udc_disconnect (void); + +int at91udc_probe(struct platform_data *pdata); + +/*-------------------------------------------------------------------------*/ + +#ifdef DEBUG +#define DBG(stuff...) printf("udc: " stuff) +#else +#define DBG(stuff...) do{}while(0) +#endif + +#ifdef VERBOSE +#define VDBG(x...) printf(x) +#else +#define VDBG(stuff...) do{}while(0) +#endif + +#ifdef PACKET_TRACE +# define PACKET VDBG +#else +# define PACKET(stuff...) do{}while(0) +#endif + +#define ERR(stuff...) printf("ERR udc: " stuff) +#define WARN(stuff...) printf("WARNING udc: " stuff) +#define INFO(stuff...) printf("INFO udc: " stuff) + +#endif +