diff options
Diffstat (limited to 'drivers/usb/gadget/imx_udc.c')
| -rw-r--r-- | drivers/usb/gadget/imx_udc.c | 1516 |
1 files changed, 1516 insertions, 0 deletions
diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c new file mode 100644 index 0000000..cde8fdf --- /dev/null +++ b/drivers/usb/gadget/imx_udc.c @@ -0,0 +1,1516 @@ +/* + * driver/usb/gadget/imx_udc.c + * + * Copyright (C) 2005 Mike Lee(eemike@gmail.com) + * Copyright (C) 2008 Darius Augulis <augulis.darius@gmail.com> + * + * 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. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/clk.h> +#include <linux/delay.h> + +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> + +#include <mach/usb.h> +#include <mach/hardware.h> + +#include "imx_udc.h" + +static const char driver_name[] = "imx_udc"; +static const char ep0name[] = "ep0"; + +void ep0_chg_stat(const char *label, struct imx_udc_struct *imx_usb, + enum ep0_state stat); + +/******************************************************************************* + * IMX UDC hardware related functions + ******************************************************************************* + */ + +void imx_udc_enable(struct imx_udc_struct *imx_usb) +{ + int temp = __raw_readl(imx_usb->base + USB_CTRL); + __raw_writel(temp | CTRL_FE_ENA | CTRL_AFE_ENA, imx_usb->base + USB_CTRL); + imx_usb->gadget.speed = USB_SPEED_FULL; +} + +void imx_udc_disable(struct imx_udc_struct *imx_usb) +{ + int temp = __raw_readl(imx_usb->base + USB_CTRL); + + __raw_writel(temp & ~(CTRL_FE_ENA | CTRL_AFE_ENA), + imx_usb->base + USB_CTRL); + + ep0_chg_stat(__func__, imx_usb, EP0_IDLE); + imx_usb->gadget.speed = USB_SPEED_UNKNOWN; +} + +void imx_udc_reset(struct imx_udc_struct *imx_usb) +{ + int temp = __raw_readl(imx_usb->base + USB_ENAB); + + /* set RST bit */ + __raw_writel(temp | ENAB_RST, imx_usb->base + USB_ENAB); + + /* wait RST bit to clear */ + do {} while (__raw_readl(imx_usb->base + USB_ENAB) & ENAB_RST); + + /* wait CFG bit to assert */ + do {} while (!(__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG)); + + /* udc module is now ready */ +} + +void imx_udc_config(struct imx_udc_struct *imx_usb) +{ + u8 ep_conf[5]; + u8 i, j, cfg; + struct imx_ep_struct *imx_ep; + + /* wait CFG bit to assert */ + do {} while (!(__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG)); + + /* Download the endpoint buffer for endpoint 0. */ + for (j = 0; j < 5; j++) { + i = (j == 2 ? imx_usb->imx_ep[0].fifosize : 0x00); + __raw_writeb(i, imx_usb->base + USB_DDAT); + do {} while (__raw_readl(imx_usb->base + USB_DADR) & DADR_BSY); + } + + /* Download the endpoint buffers for endpoints 1-5. + * We specify two configurations, one interface + */ + for (cfg = 1; cfg < 3; cfg++) { + for (i = 1; i < IMX_USB_NB_EP; i++) { + imx_ep = &imx_usb->imx_ep[i]; + /* EP no | Config no */ + ep_conf[0] = (i << 4) | (cfg << 2); + /* Type | Direction */ + ep_conf[1] = (imx_ep->bmAttributes << 3) | + (EP_DIR(imx_ep) << 2); + /* Max packet size */ + ep_conf[2] = imx_ep->fifosize; + /* TRXTYP */ + ep_conf[3] = 0xC0; + /* FIFO no */ + ep_conf[4] = i; + + D_INI(imx_usb->dev, + "<%s> ep%d_conf[%d]:" + "[%02x-%02x-%02x-%02x-%02x]\n", + __func__, i, cfg, + ep_conf[0], ep_conf[1], ep_conf[2], + ep_conf[3], ep_conf[4]); + + for (j = 0; j < 5; j++) { + __raw_writeb(ep_conf[j], + imx_usb->base + USB_DDAT); + do {} while (__raw_readl(imx_usb->base + USB_DADR) + & DADR_BSY); + } + } + } + + /* wait CFG bit to clear */ + do {} while (__raw_readl(imx_usb->base + USB_DADR) & DADR_CFG); +} + +void imx_udc_init_irq(struct imx_udc_struct *imx_usb) +{ + int i; + + /* Mask and clear all irqs */ + __raw_writel(0xFFFFFFFF, imx_usb->base + USB_MASK); + __raw_writel(0xFFFFFFFF, imx_usb->base + USB_INTR); + for (i = 0; i < IMX_USB_NB_EP; i++) { + __raw_writel(0x1FF, imx_usb->base + USB_EP_MASK(i)); + __raw_writel(0x1FF, imx_usb->base + USB_EP_INTR(i)); + } + + /* Enable USB irqs */ + __raw_writel(INTR_MSOF | INTR_FRAME_MATCH, imx_usb->base + USB_MASK); + + /* Enable EP0 irqs */ + __raw_writel(0x1FF & ~(EPINTR_DEVREQ | EPINTR_MDEVREQ | EPINTR_EOT + | EPINTR_EOF | EPINTR_FIFO_EMPTY | EPINTR_FIFO_FULL), + imx_usb->base + USB_EP_MASK(0)); +} + +void imx_udc_init_ep(struct imx_udc_struct *imx_usb) +{ + int i, max, temp; + struct imx_ep_struct *imx_ep; + for (i = 0; i < IMX_USB_NB_EP; i++) { + imx_ep = &imx_usb->imx_ep[i]; + switch (imx_ep->fifosize) { + case 8: + max = 0; + break; + case 16: + max = 1; + break; + case 32: + max = 2; + break; + case 64: + max = 3; + break; + default: + max = 1; + break; + } + temp = (EP_DIR(imx_ep) << 7) | (max << 5) + | (imx_ep->bmAttributes << 3); + __raw_writel(temp, imx_usb->base + USB_EP_STAT(i)); + __raw_writel(temp | EPSTAT_FLUSH, imx_usb->base + USB_EP_STAT(i)); + D_INI(imx_usb->dev, "<%s> ep%d_stat %08x\n", __func__, i, + __raw_readl(imx_usb->base + USB_EP_STAT(i))); + } +} + +void imx_udc_init_fifo(struct imx_udc_struct *imx_usb) +{ + int i, temp; + struct imx_ep_struct *imx_ep; + for (i = 0; i < IMX_USB_NB_EP; i++) { + imx_ep = &imx_usb->imx_ep[i]; + + /* Fifo control */ + temp = EP_DIR(imx_ep) ? 0x0B000000 : 0x0F000000; + __raw_writel(temp, imx_usb->base + USB_EP_FCTRL(i)); + D_INI(imx_usb->dev, "<%s> ep%d_fctrl %08x\n", __func__, i, + __raw_readl(imx_usb->base + USB_EP_FCTRL(i))); + + /* Fifo alarm */ + temp = (i ? imx_ep->fifosize / 2 : 0); + __raw_writel(temp, imx_usb->base + USB_EP_FALRM(i)); + D_INI(imx_usb->dev, "<%s> ep%d_falrm %08x\n", __func__, i, + __raw_readl(imx_usb->base + USB_EP_FALRM(i))); + } +} + +static void imx_udc_init(struct imx_udc_struct *imx_usb) +{ + /* Reset UDC */ + imx_udc_reset(imx_usb); + + /* Download config to enpoint buffer */ + imx_udc_config(imx_usb); + + /* Setup interrups */ + imx_udc_init_irq(imx_usb); + + /* Setup endpoints */ + imx_udc_init_ep(imx_usb); + + /* Setup fifos */ + imx_udc_init_fifo(imx_usb); +} + +void imx_ep_irq_enable(struct imx_ep_struct *imx_ep) +{ + + int i = EP_NO(imx_ep); + + __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_MASK(i)); + __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_INTR(i)); + __raw_writel(0x1FF & ~(EPINTR_EOT | EPINTR_EOF), + imx_ep->imx_usb->base + USB_EP_MASK(i)); +} + +void imx_ep_irq_disable(struct imx_ep_struct *imx_ep) +{ + + int i = EP_NO(imx_ep); + + __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_MASK(i)); + __raw_writel(0x1FF, imx_ep->imx_usb->base + USB_EP_INTR(i)); +} + +int imx_ep_empty(struct imx_ep_struct *imx_ep) +{ + struct imx_udc_struct *imx_usb = imx_ep->imx_usb; + + return __raw_readl(imx_usb->base + USB_EP_FSTAT(EP_NO(imx_ep))) + & FSTAT_EMPTY; +} + +unsigned imx_fifo_bcount(struct imx_ep_struct *imx_ep) +{ + struct imx_udc_struct *imx_usb = imx_ep->imx_usb; + + return (__raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))) + & EPSTAT_BCOUNT) >> 16; +} + +void imx_flush(struct imx_ep_struct *imx_ep) +{ + struct imx_udc_struct *imx_usb = imx_ep->imx_usb; + + int temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))); + __raw_writel(temp | EPSTAT_FLUSH, + imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))); +} + +void imx_ep_stall(struct imx_ep_struct *imx_ep) +{ + struct imx_udc_struct *imx_usb = imx_ep->imx_usb; + int temp, i; + + D_ERR(imx_usb->dev, "<%s> Forced stall on %s\n", __func__, imx_ep->ep.name); + + imx_flush(imx_ep); + + /* Special care for ep0 */ + if (EP_NO(imx_ep)) { + temp = __raw_readl(imx_usb->base + USB_CTRL); + __raw_writel(temp | CTRL_CMDOVER | CTRL_CMDERROR, imx_usb->base + USB_CTRL); + do { } while (__raw_readl(imx_usb->base + USB_CTRL) & CTRL_CMDOVER); + temp = __raw_readl(imx_usb->base + USB_CTRL); + __raw_writel(temp & ~CTRL_CMDERROR, imx_usb->base + USB_CTRL); + } + else { + temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))); + __raw_writel(temp | EPSTAT_STALL, + imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))); + + for (i = 0; i < 100; i ++) { + temp = __raw_readl(imx_usb->base + USB_EP_STAT(EP_NO(imx_ep))); + if (!temp & EPSTAT_STALL) + break; + udelay(20); + } + if (i == 50) + D_ERR(imx_usb->dev, "<%s> Non finished stall on %s\n", + __func__, imx_ep->ep.name); + } +} + +static int imx_udc_get_frame(struct usb_gadget *_gadget) +{ + struct imx_udc_struct *imx_usb = container_of(_gadget, + struct imx_udc_struct, gadget); + + return __raw_readl(imx_usb->base + USB_FRAME) & 0x7FF; +} + +static int imx_udc_wakeup(struct usb_gadget *_gadget) +{ + return 0; +} + +/******************************************************************************* + * USB request control functions + ******************************************************************************* + */ + +static void ep_add_request(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + if (unlikely(!req)) + return; + + req->in_use = 1; + list_add_tail(&req->queue, &imx_ep->queue); +} + +static void ep_del_request(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + if (unlikely(!req)) + return; + + list_del_init(&req->queue); + req->in_use = 0; +} + +static void done(struct imx_ep_struct *imx_ep, struct imx_request *req, int status) +{ + ep_del_request(imx_ep, req); + + if (likely(req->req.status == -EINPROGRESS)) + req->req.status = status; + else + status = req->req.status; + + if (status && status != -ESHUTDOWN) + D_ERR(imx_ep->imx_usb->dev, + "<%s> complete %s req %p stat %d len %u/%u\n", __func__, + imx_ep->ep.name, &req->req, status, + req->req.actual, req->req.length); + + req->req.complete(&imx_ep->ep, &req->req); +} + +static void nuke(struct imx_ep_struct *imx_ep, int status) +{ + struct imx_request *req; + + while (!list_empty(&imx_ep->queue)) { + req = list_entry(imx_ep->queue.next, struct imx_request, queue); + done(imx_ep, req, status); + } +} + +/******************************************************************************* + * Data tansfer over USB functions + ******************************************************************************* + */ +static int read_packet(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + u8 *buf; + int bytes_ep, bufferspace, count, i; + + bytes_ep = imx_fifo_bcount(imx_ep); + bufferspace = req->req.length - req->req.actual; + + buf = req->req.buf + req->req.actual; + prefetchw(buf); + + if (unlikely(imx_ep_empty(imx_ep))) + count = 0; /* zlp */ + else + count = min(bytes_ep, bufferspace); + + for (i = count; i > 0; i--) + *buf++ = __raw_readb(imx_ep->imx_usb->base + + USB_EP_FDAT0(EP_NO(imx_ep))); + req->req.actual += count; + + return count; +} + +static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + u8 *buf; + int length, count, temp; + + buf = req->req.buf + req->req.actual; + prefetch(buf); + + length = min(req->req.length - req->req.actual, (u32)imx_ep->fifosize); + + if (imx_fifo_bcount(imx_ep) + length > imx_ep->fifosize) { + D_TRX(imx_ep->imx_usb->dev, "<%s> packet overfill %s fifo\n", + __func__, imx_ep->ep.name); + return -1; + } + + req->req.actual += length; + count = length; + + if (!count && req->req.zero) { /* zlp */ + temp = __raw_readl(imx_ep->imx_usb->base + + USB_EP_STAT(EP_NO(imx_ep))); + __raw_writel(temp | EPSTAT_ZLPS, imx_ep->imx_usb->base + + USB_EP_STAT(EP_NO(imx_ep))); + D_TRX(imx_ep->imx_usb->dev, "<%s> zero packet\n", __func__); + return 0; + } + + while (count--) { + if (count == 0) { /* last byte */ + temp = __raw_readl(imx_ep->imx_usb->base + + USB_EP_FCTRL(EP_NO(imx_ep))); + __raw_writel(temp | FCTRL_WFR, imx_ep->imx_usb->base + + USB_EP_FCTRL(EP_NO(imx_ep))); + } + __raw_writeb(*buf++, + imx_ep->imx_usb->base + USB_EP_FDAT0(EP_NO(imx_ep))); + } + + return length; +} + +static int read_fifo(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + int bytes = 0, + count, + completed = 0; + + while (__raw_readl(imx_ep->imx_usb->base + USB_EP_FSTAT(EP_NO(imx_ep))) + & FSTAT_FR) { + count = read_packet(imx_ep, req); + bytes += count; + + completed = (count != imx_ep->fifosize); + if (completed || req->req.actual == req->req.length) { + completed = 1; + break; + } + } + + if (completed || !req->req.length) { + done(imx_ep, req, 0); + D_REQ(imx_ep->imx_usb->dev, "<%s> %s req<%p> %s\n", + __func__, imx_ep->ep.name, req, + completed ? "completed" : "not completed"); + if (!EP_NO(imx_ep)) + ep0_chg_stat(__func__, imx_ep->imx_usb, EP0_IDLE); + } + + D_TRX(imx_ep->imx_usb->dev, "<%s> bytes read: %d\n", __func__, bytes); + + return completed; +} + +static int write_fifo(struct imx_ep_struct *imx_ep, struct imx_request *req) +{ + int bytes = 0, + count, + completed = 0; + + while (!completed) { + count = write_packet(imx_ep, req); + if (count < 0) + break; /* busy */ + bytes += count; + + /* last packet "must be" short (or a zlp) */ + completed = (count != imx_ep->fifosize); + + if (unlikely(completed)) { + done(imx_ep, req, 0); + D_REQ(imx_ep->imx_usb->dev, "<%s> %s req<%p> %s\n", + __func__, imx_ep->ep.name, req, + completed ? "completed" : "not completed"); + if (!EP_NO(imx_ep)) + ep0_chg_stat(__func__, imx_ep->imx_usb, EP0_IDLE); + } + } + + D_TRX(imx_ep->imx_usb->dev, "<%s> bytes sent: %d\n", __func__, bytes); + + return completed; +} + +/******************************************************************************* + * Endpoint handlers + ******************************************************************************* + */ +static int handle_ep(struct imx_ep_struct *imx_ep) +{ + struct imx_request *req; + int completed = 0; + + do { + if (!list_empty(&imx_ep->queue)) + req = list_entry(imx_ep->queue.next, + struct imx_request, queue); + else { + D_REQ(imx_ep->imx_usb->dev, "<%s> no request on %s\n", + __func__, imx_ep->ep.name); + return 0; + } + + if (EP_DIR(imx_ep)) /* to host */ + completed = write_fifo(imx_ep, req); + else /* to device */ + completed = read_fifo(imx_ep, req); + + dump_ep_stat(__func__, imx_ep); + + } while (completed); + + return 0; +} + +static int handle_ep0(struct imx_ep_struct *imx_ep) +{ + struct imx_request *req = NULL; + int ret = 0; + + if (!list_empty(&imx_ep->queue)) + req = list_entry(imx_ep->queue.next, struct imx_request, queue); + + if (req) { + switch (imx_ep->imx_usb->ep0state) { + + case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR */ + write_fifo(imx_ep, req); + break; + case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR */ + read_fifo(imx_ep, req); + break; + default: + D_EP0(imx_ep->imx_usb->dev, + "<%s> ep0 i/o, odd state %d\n", + __func__, imx_ep->imx_usb->ep0state); + ep_del_request(imx_ep, req); + ret = -EL2HLT; + break; + } + } + + return ret; +} + +static void handle_ep0_devreq(struct imx_udc_struct *imx_usb) +{ + struct imx_ep_struct *imx_ep = &imx_usb->imx_ep[0]; + union { + struct usb_ctrlrequest r; + u8 raw[8]; + u32 word[2]; + } u; + int temp, i; + + nuke(imx_ep, -EPROTO); + + /* read SETUP packet */ + for (i = 0; i < 2; i++) { + if (imx_ep_empty(imx_ep)) { + D_ERR(imx_usb->dev, + "<%s> no setup packet received\n", __func__); + goto stall; + } + u.word[i] = __raw_readl(imx_usb->base + USB_EP_FDAT(EP_NO(imx_ep))); + } + + temp = imx_ep_empty(imx_ep); + while (!imx_ep_empty(imx_ep)) { + i = __raw_readl(imx_usb->base + USB_EP_FDAT(EP_NO(imx_ep))); + D_ERR(imx_usb->dev, + "<%s> wrong to have extra bytes for setup : 0x%08x\n", + __func__, i); + } + if (!temp) + goto stall; + + le16_to_cpus(&u.r.wValue); + le16_to_cpus(&u.r.wIndex); + le16_to_cpus(&u.r.wLength); + + D_REQ(imx_usb->dev, "<%s> SETUP %02x.%02x v%04x i%04x l%04x\n", + __func__, u.r.bRequestType, u.r.bRequest, + u.r.wValue, u.r.wIndex, u.r.wLength); + + if (imx_usb->set_config) { + /* NACK the host by using CMDOVER */ + temp = __raw_readl(imx_usb->base + USB_CTRL); + __raw_writel(temp | CTRL_CMDOVER, imx_usb->base + USB_CTRL); + + D_ERR(imx_usb->dev, + "<%s> set config req is pending, NACK the host\n", + __func__); + return; + } + + if (u.r.bRequestType & USB_DIR_IN) + ep0_chg_stat(__func__, imx_usb, EP0_IN_DATA_PHASE); + else + ep0_chg_stat(__func__, imx_usb, EP0_OUT_DATA_PHASE); + + i = imx_usb->driver->setup(&imx_usb->gadget, &u.r); + if (i < 0) { + D_ERR(imx_usb->dev, "<%s> device setup error %d\n", + __func__, i); + goto stall; + } + + return; +stall: + D_ERR(imx_usb->dev, "<%s> protocol STALL\n", __func__); + imx_ep_stall(imx_ep); + ep0_chg_stat(__func__, imx_usb, EP0_STALL); + return; +} + +/******************************************************************************* + * USB gadget callback functions + ******************************************************************************* + */ + +static int imx_ep_enable(struct usb_ep *usb_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct imx_ep_struct *imx_ep = container_of(usb_ep, + struct imx_ep_struct, ep); + struct imx_udc_struct *imx_usb = imx_ep->imx_usb; + unsigned long flags; + + if (!usb_ep + || !desc + || !EP_NO(imx_ep) + || desc->bDescriptorType != USB_DT_ENDPOINT + || imx_ep->bEndpointAddress != desc->bEndpointAddress) { + D_ERR(imx_usb->dev, + "<%s> bad ep or descriptor\n", __func__); + return -EINVAL; + } + + if (imx_ep->bmAttributes != desc->bmAttributes) { + D_ERR(imx_usb->dev, + "<%s> %s type mismatch\n", __func__, usb_ep->name); + return -EINVAL; + } + + if (imx_ep->fifosize < le16_to_cpu(desc->wMaxPacketSize)) { + D_ERR(imx_usb->dev, + "<%s> bad %s maxpacket\n", __func__, usb_ep->name); + return -ERANGE; + } + + if (!imx_usb->driver || imx_usb->gadget.speed == USB_SPEED_UNKNOWN) { + D_ERR(imx_usb->dev, "<%s> bogus device state\n", __func__); + return -ESHUTDOWN; + } + + local_irq_save(flags); + + imx_ep->stopped = 0; + imx_flush(imx_ep); + imx_ep_irq_enable(imx_ep); + + local_irq_restore(flags); + + D_EPX(imx_usb->dev, "<%s> ENABLED %s\n", __func__, usb_ep->name); + return 0; +} + +static int imx_ep_disable(struct usb_ep *usb_ep) +{ + struct imx_ep_struct *imx_ep = container_of(usb_ep, + struct imx_ep_struct, ep); + unsigned long flags; + + if (!usb_ep || !EP_NO(imx_ep) || !list_empty(&imx_ep->queue)) { + D_ERR(imx_ep->imx_usb->dev, "<%s> %s can not be disabled\n", + __func__, usb_ep ? imx_ep->ep.name : NULL); + return -EINVAL; + } + + local_irq_save(flags); + + imx_ep->stopped = 1; + nuke(imx_ep, -ESHUTDOWN); + imx_flush(imx_ep); + imx_ep_irq_disable(imx_ep); + + local_irq_restore(flags); + + D_EPX(imx_ep->imx_usb->dev, + "<%s> DISABLED %s\n", __func__, usb_ep->name); + return 0; +} + +static struct usb_request *imx_ep_alloc_request + (struct usb_ep *usb_ep, gfp_t gfp_flags) +{ + struct imx_request *req; + + req = kzalloc(sizeof *req, gfp_flags); + if (!req || !usb_ep) + return 0; + + INIT_LIST_HEAD(&req->queue); + req->in_use = 0; + + return &req->req; +} + +static void imx_ep_free_request + (struct usb_ep *usb_ep, struct usb_request *usb_req) +{ + struct imx_request *req; + + req = container_of(usb_req, struct imx_request, req); + WARN_ON(!list_empty(&req->queue)); + kfree(req); +} + +static int imx_ep_queue + (struct usb_ep *usb_ep, struct usb_request *usb_req, gfp_t gfp_flags) +{ + struct imx_ep_struct *imx_ep; + struct imx_udc_struct *imx_usb; + struct imx_request *req; + unsigned long flags; + int ret = 0; + + imx_ep = container_of(usb_ep, struct imx_ep_struct, ep); + imx_usb = imx_ep->imx_usb; + req = container_of(usb_req, struct imx_request, req); + + /* + Special care on IMX udc. + Ignore enqueue when after set configuration from the + host. This assume all gadget drivers reply set + configuration with the next ep0 req enqueue. + */ + if (imx_usb->set_config && !EP_NO(imx_ep)) { + imx_usb->set_config = 0; + D_EPX(imx_usb->dev, + "<%s> gadget reply set config\n", __func__); + return 0; + } + + if (unlikely(!usb_req || !req || !usb_req->complete || !usb_req->buf)) { + D_ERR(imx_usb->dev, "<%s> bad params\n", __func__); + return -EINVAL; + } + + if (unlikely(!usb_ep || !imx_ep)) { + D_ERR(imx_usb->dev, "<%s> bad ep\n", __func__); + return -EINVAL; + } + + if (!imx_usb->driver || imx_usb->gadget.speed == USB_SPEED_UNKNOWN) { + D_ERR(imx_usb->dev, "<%s> bogus device state\n", __func__); + return -ESHUTDOWN; + } + + local_irq_save(flags); + + /* Debug */ + D_REQ(imx_usb->dev, "<%s> ep%d %s request for [%d] bytes\n", + __func__, EP_NO(imx_ep), + ((!EP_NO(imx_ep) && imx_ep->imx_usb->ep0state == EP0_IN_DATA_PHASE) + || (EP_NO(imx_ep) && EP_DIR(imx_ep))) ? "IN" : "OUT", usb_req->length); + dump_req(__func__, imx_ep, usb_req); + + if (imx_ep->stopped) { + usb_req->status = -ESHUTDOWN; + ret = -ESHUTDOWN; + goto out; + } + + if (req->in_use) { + D_ERR(imx_usb->dev, + "<%s> refusing to queue req %p (already queued)\n", + __func__, req); + goto out; + } + + usb_req->status = -EINPROGRESS; + usb_req->actual = 0; + + ep_add_request(imx_ep, req); + + if (!EP_NO(imx_ep)) + ret = handle_ep0(imx_ep); + else + ret = handle_ep(imx_ep); +out: + local_irq_restore(flags); + return ret; +} + +static int imx_ep_dequeue(struct usb_ep *usb_ep, struct usb_request *usb_req) +{ + + struct imx_ep_struct *imx_ep = container_of + (usb_ep, struct imx_ep_struct, ep); + struct imx_request *req; + unsigned long flags; + + if (unlikely(!usb_ep || !EP_NO(imx_ep))) { + D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__); + return -EINVAL; + } + + local_irq_save(flags); + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry(req, &imx_ep->queue, queue) { + if (&req->req == usb_req) + break; + } + if (&req->req != usb_req) { + local_irq_restore(flags); + return -EINVAL; + } + + done(imx_ep, req, -ECONNRESET); + + local_irq_restore(flags); + return 0; +} + +static int imx_ep_set_halt(struct usb_ep *usb_ep, int value) +{ + struct imx_ep_struct *imx_ep = container_of + (usb_ep, struct imx_ep_struct, ep); + unsigned long flags; + + if (unlikely(!usb_ep || !EP_NO(imx_ep))) { + D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__); + return -EINVAL; + } + + local_irq_save(flags); + + if ((imx_ep->bEndpointAddress & USB_DIR_IN) + && !list_empty(&imx_ep->queue)) { + local_irq_restore(flags); + return -EAGAIN; + } + + imx_ep_stall(imx_ep); + + local_irq_restore(flags); + + D_EPX(imx_ep->imx_usb->dev, "<%s> %s halt\n", __func__, usb_ep->name); + return 0; +} + +static int imx_ep_fifo_status(struct usb_ep *usb_ep) +{ + struct imx_ep_struct *imx_ep = container_of + (usb_ep, struct imx_ep_struct, ep); + + if (!usb_ep) { + D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__); + return -ENODEV; + } + + if (imx_ep->imx_usb->gadget.speed == USB_SPEED_UNKNOWN) + return 0; + else + return imx_fifo_bcount(imx_ep); +} + +static void imx_ep_fifo_flush(struct usb_ep *usb_ep) +{ + struct imx_ep_struct *imx_ep = container_of + (usb_ep, struct imx_ep_struct, ep); + unsigned long flags; + + local_irq_save(flags); + + if (!usb_ep || !EP_NO(imx_ep) || !list_empty(&imx_ep->queue)) { + D_ERR(imx_ep->imx_usb->dev, "<%s> bad ep\n", __func__); + local_irq_restore(flags); + return; + } + + /* toggle and halt bits stay unchanged */ + imx_flush(imx_ep); + + local_irq_restore(flags); +} + +static struct usb_ep_ops imx_ep_ops = { + .enable = imx_ep_enable, + .disable = imx_ep_disable, + + .alloc_request = imx_ep_alloc_request, + .free_request = imx_ep_free_request, + + .queue = imx_ep_queue, + .dequeue = imx_ep_dequeue, + + .set_halt = imx_ep_set_halt, + .fifo_status = imx_ep_fifo_status, + .fifo_flush = imx_ep_fifo_flush, +}; + +/******************************************************************************* + * USB endpoint control functions + ******************************************************************************* + */ + +void ep0_chg_stat(const char *label, + struct imx_udc_struct *imx_usb, enum ep0_state stat) +{ + D_EP0(imx_usb->dev, "<%s> from %15s to %15s\n", + label, state_name[imx_usb->ep0state], state_name[stat]); + + if (imx_usb->ep0state == stat) + return; + + imx_usb->ep0state = stat; +} + +static void usb_init_data(struct imx_udc_struct *imx_usb) +{ + struct imx_ep_struct *imx_ep; + u8 i; + + /* device/ep0 records init */ + INIT_LIST_HEAD(&imx_usb->gadget.ep_list); + INIT_LIST_HEAD(&imx_usb->gadget.ep0->ep_list); + ep0_chg_stat(__func__, imx_usb, EP0_IDLE); + + /* basic endpoint records init */ + for (i = 0; i < IMX_USB_NB_EP; i++) { + imx_ep = &imx_usb->imx_ep[i]; + + if (i) { + list_add_tail(&imx_ep->ep.ep_list, + &imx_usb->gadget.ep_list); + imx_ep->stopped = 1; + } else + imx_ep->stopped = 0; + + INIT_LIST_HEAD(&imx_ep->queue); + } +} + +static void udc_stop_activity(struct imx_udc_struct *imx_usb, + struct usb_gadget_driver *driver) +{ + struct imx_ep_struct *imx_ep; + int i; + + if (imx_usb->gadget.speed == USB_SPEED_UNKNOWN) + driver = NULL; + + /* prevent new request submissions, kill any outstanding requests */ + for (i = 1; i < IMX_USB_NB_EP; i++) { + imx_ep = &imx_usb->imx_ep[i]; + imx_flush(imx_ep); + imx_ep->stopped = 1; + imx_ep_irq_disable(imx_ep); + nuke(imx_ep, -ESHUTDOWN); + } + + imx_usb->cfg = 0; + imx_usb->intf = 0; + imx_usb->alt = 0; + + if (driver) + driver->disconnect(&imx_usb->gadget); +} + +/******************************************************************************* + * Interrupt handlers + ******************************************************************************* + */ + +static irqreturn_t imx_udc_irq(int irq, void *dev) +{ + struct imx_udc_struct *imx_usb = dev; + struct usb_ctrlrequest u; + int temp, cfg, intf, alt; + int intr = __raw_readl(imx_usb->base + USB_INTR); + + if (intr & (INTR_WAKEUP | INTR_SUSPEND | INTR_RESUME | INTR_RESET_START + | INTR_RESET_STOP | INTR_CFG_CHG)) { + dump_intr(__func__, intr, imx_usb->dev); + dump_usb_stat(__func__, imx_usb); + } + + if (!imx_usb->driver) { + /*imx_udc_disable(imx_usb);*/ + goto end_irq; + } + + if (intr & INTR_WAKEUP) { + if (imx_usb->gadget.speed == USB_SPEED_UNKNOWN + && imx_usb->driver && imx_usb->driver->resume) + imx_usb->driver->resume(&imx_usb->gadget); + imx_usb->set_config = 0; + imx_usb->gadget.speed = USB_SPEED_FULL; + } + + if (intr & INTR_SUSPEND) { + if (imx_usb->gadget.speed != USB_SPEED_UNKNOWN + && imx_usb->driver && imx_usb->driver->suspend) + imx_usb->driver->suspend(&imx_usb->gadget); + imx_usb->set_config = 0; + imx_usb->gadget.speed = USB_SPEED_UNKNOWN; + } + + if (intr & INTR_RESET_START) { + __raw_writel(intr, imx_usb->base + USB_INTR); + udc_stop_activity(imx_usb, imx_usb->driver); + imx_usb->set_config = 0; + imx_usb->gadget.speed = USB_SPEED_UNKNOWN; + } + + if (intr & INTR_RESET_STOP) + imx_usb->gadget.speed = USB_SPEED_FULL; + + if (intr & INTR_CFG_CHG) { + __raw_writel(INTR_CFG_CHG, imx_usb->base + USB_INTR); + temp = __raw_readl(imx_usb->base + USB_STAT); + cfg = (temp & STAT_CFG) >> 5; + intf = (temp & STAT_INTF) >> 3; + alt = temp & STAT_ALTSET; + + D_REQ(imx_usb->dev, + "<%s> orig config C=%d, I=%d, A=%d / " + "req config C=%d, I=%d, A=%d\n", + __func__, imx_usb->cfg, imx_usb->intf, imx_usb->alt, + cfg, intf, alt); + + if (cfg != 1 && cfg != 2) + goto end_irq; + + imx_usb->set_config = 0; + + /* Config setup */ + if (imx_usb->cfg != cfg) { + D_REQ(imx_usb->dev, "<%s> Change config start\n",__func__); + u.bRequest = USB_REQ_SET_CONFIGURATION; + u.bRequestType = USB_DIR_OUT | + USB_TYPE_STANDARD | + USB_RECIP_DEVICE; + u.wValue = cfg; + u.wIndex = 0; + u.wLength = 0; + imx_usb->cfg = cfg; + imx_usb->set_config = 1; + imx_usb->driver->setup(&imx_usb->gadget, &u); + imx_usb->set_config = 0; + D_REQ(imx_usb->dev, "<%s> Change config done\n",__func__); + + } + if (imx_usb->intf != intf || imx_usb->alt != alt) { + D_REQ(imx_usb->dev, "<%s> Change interface start\n",__func__); + u.bRequest = USB_REQ_SET_INTERFACE; + u.bRequestType = USB_DIR_OUT | + USB_TYPE_STANDARD | + USB_RECIP_INTERFACE; + u.wValue = alt; + u.wIndex = intf; + u.wLength = 0; + imx_usb->intf = intf; + imx_usb->alt = alt; + imx_usb->set_config = 1; + imx_usb->driver->setup(&imx_usb->gadget, &u); + imx_usb->set_config = 0; + D_REQ(imx_usb->dev, "<%s> Change interface done\n",__func__); + } + } + + if (intr & INTR_SOF) { + if (imx_usb->ep0state == EP0_IDLE) { + temp = __raw_readl(imx_usb->base + USB_CTRL); + __raw_writel(temp | CTRL_CMDOVER, imx_usb->base + USB_CTRL); + } + } + +end_irq: + __raw_writel(intr, imx_usb->base + USB_INTR); + return IRQ_HANDLED; +} + +static irqreturn_t imx_udc_ctrl_irq(int irq, void *dev) +{ + struct imx_udc_struct *imx_usb = dev; + int intr = __raw_readl(imx_usb->base + USB_EP_INTR(0)); + + dump_ep_intr(__func__, 0, intr, imx_usb->dev); + + if (!imx_usb->driver) { + __raw_writel(intr, imx_usb->base + USB_EP_INTR(0)); + return IRQ_HANDLED; + } + + /* DEVREQ IRQ has highest priority */ + if (intr & (EPINTR_DEVREQ | EPINTR_MDEVREQ)) + handle_ep0_devreq(imx_usb); + /* Seem i.MX is missing EOF interrupt sometimes. + * Therefore we monitor both EOF and FIFO_EMPTY interrups + * when transmiting, and both EOF and FIFO_FULL when + * receiving data. + */ + else if (intr & (EPINTR_EOF | EPINTR_FIFO_EMPTY | EPINTR_FIFO_FULL)) + handle_ep0(&imx_usb->imx_ep[0]); + + __raw_writel(intr, imx_usb->base + USB_EP_INTR(0)); + + return IRQ_HANDLED; +} + +static irqreturn_t imx_udc_bulk_irq(int irq, void *dev) +{ + struct imx_udc_struct *imx_usb = dev; + struct imx_ep_struct *imx_ep = &imx_usb->imx_ep[irq - USBD_INT0]; + int intr = __raw_readl(imx_usb->base + USB_EP_INTR(EP_NO(imx_ep))); + + dump_ep_intr(__func__, irq - USBD_INT0, intr, imx_usb->dev); + + if (!imx_usb->driver) { + __raw_writel(intr, imx_usb->base + USB_EP_INTR(EP_NO(imx_ep))); + return IRQ_HANDLED; + } + + handle_ep(imx_ep); + + __raw_writel(intr, imx_usb->base + USB_EP_INTR(EP_NO(imx_ep))); + + return IRQ_HANDLED; +} + +irq_handler_t intr_handler(int i) +{ + switch (i) { + case 0: + return imx_udc_ctrl_irq; + case 1: + case 2: + case 3: + case 4: + case 5: + return imx_udc_bulk_irq; + default: + return imx_udc_irq; + } +} + +/******************************************************************************* + * Static defined IMX UDC structure + ******************************************************************************* + */ + +static const struct usb_gadget_ops imx_udc_ops = { + .get_frame = imx_udc_get_frame, + .wakeup = imx_udc_wakeup, +}; + +static struct imx_udc_struct controller = { + .gadget = { + .ops = &imx_udc_ops, + .ep0 = &controller.imx_ep[0].ep, + .name = driver_name, + .dev = { + .bus_id = "gadget", + }, + }, + + .imx_ep[0] = { + .ep = { + .name = ep0name, + .ops = &imx_ep_ops, + .maxpacket = 32, + }, + .imx_usb = &controller, + .fifosize = 32, + .bEndpointAddress = 0, + .bmAttributes = USB_ENDPOINT_XFER_CONTROL, + }, + .imx_ep[1] = { + .ep = { + .name = "ep1in-bulk", + .ops = &imx_ep_ops, + .maxpacket = 64, + }, + .imx_usb = &controller, + .fifosize = 64, + .bEndpointAddress = USB_DIR_IN | 1, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + }, + .imx_ep[2] = { + .ep = { + .name = "ep2out-bulk", + .ops = &imx_ep_ops, + .maxpacket = 64, + }, + .imx_usb = &controller, + .fifosize = 64, + .bEndpointAddress = USB_DIR_OUT | 2, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + }, + .imx_ep[3] = { + .ep = { + .name = "ep3out-bulk", + .ops = &imx_ep_ops, + .maxpacket = 32, + }, + .imx_usb = &controller, + .fifosize = 32, + .bEndpointAddress = USB_DIR_OUT | 3, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + }, + .imx_ep[4] = { + .ep = { + .name = "ep4in-int", + .ops = &imx_ep_ops, + .maxpacket = 32, + }, + .imx_usb = &controller, + .fifosize = 32, + .bEndpointAddress = USB_DIR_IN | 4, + .bmAttributes = USB_ENDPOINT_XFER_INT, + }, + .imx_ep[5] = { + .ep = { + .name = "ep5out-int", + .ops = &imx_ep_ops, + .maxpacket = 32, + }, + .imx_usb = &controller, + .fifosize = 32, + .bEndpointAddress = USB_DIR_OUT | 5, + .bmAttributes = USB_ENDPOINT_XFER_INT, + }, +}; + +/******************************************************************************* + * USB gadged driver functions + ******************************************************************************* + */ +int usb_gadget_register_driver(struct usb_gadget_driver *driver) +{ + struct imx_udc_struct *imx_usb = &controller; + int retval; + + if (!driver + || driver->speed < USB_SPEED_FULL + || !driver->bind + || !driver->disconnect + || !driver->setup) + return -EINVAL; + if (!imx_usb) + return -ENODEV; + if (imx_usb->driver) + return -EBUSY; + + /* first hook up the driver ... */ + imx_usb->driver = driver; + imx_usb->gadget.dev.driver = &driver->driver; + + retval = device_add(&imx_usb->gadget.dev); + if (retval) + goto fail; + retval = driver->bind(&imx_usb->gadget); + if (retval) { + D_ERR(imx_usb->dev, "<%s> bind to driver %s --> error %d\n", + __func__, driver->driver.name, retval); + device_del(&imx_usb->gadget.dev); + + goto fail; + } + + D_INI(imx_usb->dev, "<%s> registered gadget driver '%s'\n", + __func__, driver->driver.name); + + imx_udc_enable(imx_usb); + + return 0; +fail: + imx_usb->driver = NULL; + imx_usb->gadget.dev.driver = NULL; + return retval; +} +EXPORT_SYMBOL(usb_gadget_register_driver); + +int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) +{ + struct imx_udc_struct *imx_usb = &controller; + + if (!imx_usb) + return -ENODEV; + if (!driver || driver != imx_usb->driver || !driver->unbind) + return -EINVAL; + + udc_stop_activity(imx_usb, driver); + imx_udc_disable(imx_usb); + + driver->unbind(&imx_usb->gadget); + imx_usb->gadget.dev.driver = NULL; + imx_usb->driver = NULL; + + device_del(&imx_usb->gadget.dev); + + D_INI(imx_usb->dev, "<%s> unregistered gadget driver '%s'\n", + __func__, driver->driver.name); + + return 0; +} +EXPORT_SYMBOL(usb_gadget_unregister_driver); + +/******************************************************************************* + * Module functions + ******************************************************************************* + */ + +static int __init imx_udc_probe(struct platform_device *pdev) +{ + struct imx_udc_struct *imx_usb = &controller; + struct resource *res; + struct imxusb_platform_data *pdata; + struct clk *clk; + void __iomem *base; + int ret = 0; + int i, res_size; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "can't get device resources\n"); + return -ENODEV; + } + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(&pdev->dev, "driver needs platform data\n"); + return -ENODEV; + } + + res_size = res->end - res->start + 1; + if (!request_mem_region(res->start, res_size, res->name)) { + dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n", + res_size, res->start); + return -ENOMEM; + } + + if (pdata->init) { + ret = pdata->init(&pdev->dev); + if (ret) + goto fail0; + } + + base = ioremap(res->start, res_size); + if (!base) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -EIO; + goto fail1; + } + + clk = clk_get(NULL, "usbd_clk"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(&pdev->dev, "can't get USB clock\n"); + goto fail2; + } + clk_enable(clk); + + if (clk_get_rate(clk) != 48000000) { + D_INI(&pdev->dev, + "Bad USB clock (%d Hz), changing to 48000000 Hz\n", + (int)clk_get_rate(clk)); + if (clk_set_rate(clk, 48000000)) { + dev_err(&pdev->dev, + "Unable to set correct USB clock (48MHz)\n"); + ret = -EIO; + goto fail3; + } + } + + for (i = 0; i < IMX_USB_NB_EP + 1; i++) { + imx_usb->usbd_int[i] = platform_get_irq(pdev, i); + if (imx_usb->usbd_int[i] < 0) { + dev_err(&pdev->dev, "can't get irq number\n"); + ret = -ENODEV; + goto fail3; + } + } + + for (i = 0; i < IMX_USB_NB_EP + 1; i++) { + ret = request_irq(imx_usb->usbd_int[i], intr_handler(i), + IRQF_DISABLED, driver_name, imx_usb); + if (ret) { + dev_err(&pdev->dev, "can't get irq %i, err %d\n", + imx_usb->usbd_int[i], ret); + for (--i; i >= 0; i--) + free_irq(imx_usb->usbd_int[i], imx_usb); + goto fail3; + } + } + + imx_usb->res = res; + imx_usb->base = base; + imx_usb->clk = clk; + imx_usb->dev = &pdev->dev; + + device_initialize(&imx_usb->gadget.dev); + + imx_usb->gadget.dev.parent = &pdev->dev; + imx_usb->gadget.dev.dma_mask = pdev->dev.dma_mask; + + platform_set_drvdata(pdev, imx_usb); + + usb_init_data(imx_usb); + imx_udc_init(imx_usb); + + return 0; + +fail3: + clk_put(clk); + clk_disable(clk); +fail2: + iounmap(base); +fail1: + if (pdata->exit) + pdata->exit(&pdev->dev); +fail0: + release_mem_region(res->start, res_size); + return ret; +} + +static int __exit imx_udc_remove(struct platform_device *pdev) +{ + struct imx_udc_struct *imx_usb = platform_get_drvdata(pdev); + struct imxusb_platform_data *pdata = pdev->dev.platform_data; + int i; + + imx_udc_disable(imx_usb); + + for (i = 0; i < IMX_USB_NB_EP + 1; i++) + free_irq(imx_usb->usbd_int[i], imx_usb); + + clk_put(imx_usb->clk); + clk_disable(imx_usb->clk); + iounmap(imx_usb->base); + + release_mem_region(imx_usb->res->start, + imx_usb->res->end - imx_usb->res->start + 1); + + if (pdata->exit) + pdata->exit(&pdev->dev); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +/*----------------------------------------------------------------------------*/ + +#ifdef CONFIG_PM +#define imx_udc_suspend NULL +#define imx_udc_resume NULL +#else +#define imx_udc_suspend NULL +#define imx_udc_resume NULL +#endif + +/*----------------------------------------------------------------------------*/ + +static struct platform_driver udc_driver = { + .driver = { + .name = driver_name, + .owner = THIS_MODULE, + }, + .remove = __exit_p(imx_udc_remove), + .suspend = imx_udc_suspend, + .resume = imx_udc_resume, +}; + +static int __init udc_init(void) +{ + return platform_driver_probe(&udc_driver, imx_udc_probe); +} +module_init(udc_init); + +static void __exit udc_exit(void) +{ + platform_driver_unregister(&udc_driver); +} +module_exit(udc_exit); + +MODULE_DESCRIPTION("IMX USB Device Controller driver"); +MODULE_AUTHOR("Darius Augulis <augulis.darius@gmail.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:imx_udc"); |
