[PATCH v5 3/4] USB: Gadget: Add Samsung S3C24XX USB High-Speed controller driver
Heiko Stübner
heiko at sntech.de
Sat May 7 16:28:04 EDT 2011
From: Thomas Abraham <thomas.ab at samsung.com>
The Samsung's S3C2416, S3C2443 and S3C2450 includes a USB High-Speed
device controller module. This driver enables support for USB high-speed
gadget functionality for the Samsung S3C24xx SoC's that include this
controller.
Signed-off-by: Thomas Abraham <thomas.ab at samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73 at samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
Signed-off-by: Alexander Neumann <alexander at bumpern.de>
Signed-off-by: Heiko Stuebner <heiko at sntech.de>
---
Changes since v1:
- Addressed comments from Ben Dooks
Thomas Abraham <thomas.ab at samsung.com>
Changes since v2:
- Update the driver to match the data structure changes introduced by
commit b0fca50f5a94a268ed02cfddf44448051ed9343f.
Alexander Neumann <alexander at debian.org>
- Move s3c_hsudc to 0x29 in usb_gadget_controller_number in gadget_chips.h
Heiko Stuebner <heiko at sntech.de>
Changes since v3:
- Update gadget_chips.h-id again
Heiko Stuebner <heiko at sntech.de>
Changes since v4:
- Add set_wedge function
Thomas Abraham <thomas.ab at samsung.com>
drivers/usb/gadget/Kconfig | 17 +
drivers/usb/gadget/Makefile | 1 +
drivers/usb/gadget/gadget_chips.h | 8 +
drivers/usb/gadget/s3c-hsudc.c | 1349 +++++++++++++++++++++++++++++++++++++
4 files changed, 1375 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/gadget/s3c-hsudc.c
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 4c02b9f..58456d1 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -356,6 +356,23 @@ config USB_S3C2410_DEBUG
boolean "S3C2410 udc debug messages"
depends on USB_GADGET_S3C2410
+config USB_GADGET_S3C_HSUDC
+ boolean "S3C2416, S3C2443 and S3C2450 USB Device Controller"
+ depends on ARCH_S3C2410
+ select USB_GADGET_DUALSPEED
+ help
+ Samsung's S3C2416, S3C2443 and S3C2450 is an ARM9 based SoC
+ integrated with dual speed USB 2.0 device controller. It has
+ 8 endpoints, as well as endpoint zero.
+
+ This driver has been tested on S3C2416 and S3C2450 processors.
+
+config USB_S3C_HSUDC
+ tristate
+ depends on USB_GADGET_S3C_HSUDC
+ default USB_GADGET
+ select USB_GADGET_SELECTED
+
config USB_GADGET_PXA_U2O
boolean "PXA9xx Processor USB2.0 controller"
select USB_GADGET_DUALSPEED
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 1ea15ee..4fe92b1 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_USB_R8A66597) += r8a66597-udc.o
obj-$(CONFIG_USB_FSL_QE) += fsl_qe_udc.o
obj-$(CONFIG_USB_CI13XXX_PCI) += ci13xxx_pci.o
obj-$(CONFIG_USB_S3C_HSOTG) += s3c-hsotg.o
+obj-$(CONFIG_USB_S3C_HSUDC) += s3c-hsudc.o
obj-$(CONFIG_USB_LANGWELL) += langwell_udc.o
obj-$(CONFIG_USB_EG20T) += pch_udc.o
obj-$(CONFIG_USB_PXA_U2O) += mv_udc.o
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index ec3fd97..bcdac7c 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -136,6 +136,12 @@
#define gadget_is_s3c_hsotg(g) 0
#endif
+#ifdef CONFIG_USB_S3C_HSUDC
+#define gadget_is_s3c_hsudc(g) (!strcmp("s3c-hsudc", (g)->name))
+#else
+#define gadget_is_s3c_hsudc(g) 0
+#endif
+
#ifdef CONFIG_USB_GADGET_EG20T
#define gadget_is_pch(g) (!strcmp("pch_udc", (g)->name))
#else
@@ -215,6 +221,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
return 0x28;
else if (gadget_is_renesas_usbhs(gadget))
return 0x29;
+ else if (gadget_is_s3c_hsudc(gadget))
+ return 0x30;
return -ENOENT;
}
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
new file mode 100644
index 0000000..c509487
--- /dev/null
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -0,0 +1,1349 @@
+/* linux/drivers/usb/gadget/s3c-hsudc.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * S3C24XX USB 2.0 High-speed USB controller gadget driver
+ *
+ * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints.
+ * Each endpoint can be configured as either in or out endpoint. Endpoints
+ * can be configured for Bulk or Interrupt transfer mode.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <mach/regs-s3c2443-clock.h>
+#include <plat/udc.h>
+
+#define S3C_HSUDC_REG(x) (x)
+
+/* Non-Indexed Registers */
+#define S3C_IR S3C_HSUDC_REG(0x00) /* Index Register */
+#define S3C_EIR S3C_HSUDC_REG(0x04) /* EP Intr Status */
+#define S3C_EIR_EP0 (1<<0)
+#define S3C_EIER S3C_HSUDC_REG(0x08) /* EP Intr Enable */
+#define S3C_FAR S3C_HSUDC_REG(0x0c) /* Gadget Address */
+#define S3C_FNR S3C_HSUDC_REG(0x10) /* Frame Number */
+#define S3C_EDR S3C_HSUDC_REG(0x14) /* EP Direction */
+#define S3C_TR S3C_HSUDC_REG(0x18) /* Test Register */
+#define S3C_SSR S3C_HSUDC_REG(0x1c) /* System Status */
+#define S3C_SSR_DTZIEN_EN (0xff8f)
+#define S3C_SSR_ERR (0xff80)
+#define S3C_SSR_VBUSON (1 << 8)
+#define S3C_SSR_HSP (1 << 4)
+#define S3C_SSR_SDE (1 << 3)
+#define S3C_SSR_RESUME (1 << 2)
+#define S3C_SSR_SUSPEND (1 << 1)
+#define S3C_SSR_RESET (1 << 0)
+#define S3C_SCR S3C_HSUDC_REG(0x20) /* System Control */
+#define S3C_SCR_DTZIEN_EN (1 << 14)
+#define S3C_SCR_RRD_EN (1 << 5)
+#define S3C_SCR_SUS_EN (1 << 1)
+#define S3C_SCR_RST_EN (1 << 0)
+#define S3C_EP0SR S3C_HSUDC_REG(0x24) /* EP0 Status */
+#define S3C_EP0SR_EP0_LWO (1 << 6)
+#define S3C_EP0SR_STALL (1 << 4)
+#define S3C_EP0SR_TX_SUCCESS (1 << 1)
+#define S3C_EP0SR_RX_SUCCESS (1 << 0)
+#define S3C_EP0CR S3C_HSUDC_REG(0x28) /* EP0 Control */
+#define S3C_BR(_x) S3C_HSUDC_REG(0x60 + (_x * 4))
+
+/* Indexed Registers */
+#define S3C_ESR S3C_HSUDC_REG(0x2c) /* EPn Status */
+#define S3C_ESR_FLUSH (1 << 6)
+#define S3C_ESR_STALL (1 << 5)
+#define S3C_ESR_LWO (1 << 4)
+#define S3C_ESR_PSIF_ONE (1 << 2)
+#define S3C_ESR_PSIF_TWO (2 << 2)
+#define S3C_ESR_TX_SUCCESS (1 << 1)
+#define S3C_ESR_RX_SUCCESS (1 << 0)
+#define S3C_ECR S3C_HSUDC_REG(0x30) /* EPn Control */
+#define S3C_ECR_DUEN (1 << 7)
+#define S3C_ECR_FLUSH (1 << 6)
+#define S3C_ECR_STALL (1 << 1)
+#define S3C_ECR_IEMS (1 << 0)
+#define S3C_BRCR S3C_HSUDC_REG(0x34) /* Read Count */
+#define S3C_BWCR S3C_HSUDC_REG(0x38) /* Write Count */
+#define S3C_MPR S3C_HSUDC_REG(0x3c) /* Max Pkt Size */
+
+#define WAIT_FOR_SETUP (0)
+#define DATA_STATE_XMIT (1)
+#define DATA_STATE_RECV (2)
+
+/**
+ * struct s3c_hsudc_ep - Endpoint representation used by driver.
+ * @ep: USB gadget layer representation of device endpoint.
+ * @name: Endpoint name (as required by ep autoconfiguration).
+ * @dev: Reference to the device controller to which this EP belongs.
+ * @desc: Endpoint descriptor obtained from the gadget driver.
+ * @queue: Transfer request queue for the endpoint.
+ * @stopped: Maintains state of endpoint, set if EP is halted.
+ * @bEndpointAddress: EP address (including direction bit).
+ * @fifo: Base address of EP FIFO.
+ */
+struct s3c_hsudc_ep {
+ struct usb_ep ep;
+ char name[20];
+ struct s3c_hsudc *dev;
+ const struct usb_endpoint_descriptor *desc;
+ struct list_head queue;
+ u8 stopped;
+ u8 wedge;
+ u8 bEndpointAddress;
+ void __iomem *fifo;
+};
+
+/**
+ * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request.
+ * @req: Reference to USB gadget transfer request.
+ * @queue: Used for inserting this request to the endpoint request queue.
+ */
+struct s3c_hsudc_req {
+ struct usb_request req;
+ struct list_head queue;
+};
+
+/**
+ * struct s3c_hsudc - Driver's abstraction of the device controller.
+ * @gadget: Instance of usb_gadget which is referenced by gadget driver.
+ * @driver: Reference to currenty active gadget driver.
+ * @dev: The device reference used by probe function.
+ * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed).
+ * @regs: Remapped base address of controller's register space.
+ * @mem_rsrc: Device memory resource used for remapping device register space.
+ * irq: IRQ number used by the controller.
+ * uclk: Reference to the controller clock.
+ * ep0state: Current state of EP0.
+ * ep: List of endpoints supported by the controller.
+ */
+struct s3c_hsudc {
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+ struct device *dev;
+ struct s3c24xx_hsudc_platdata *pd;
+ spinlock_t lock;
+ void __iomem *regs;
+ struct resource *mem_rsrc;
+ int irq;
+ struct clk *uclk;
+ int ep0state;
+ struct s3c_hsudc_ep ep[];
+};
+
+#define ep_maxpacket(_ep) ((_ep)->ep.maxpacket)
+#define ep_is_in(_ep) ((_ep)->bEndpointAddress & USB_DIR_IN)
+#define ep_index(_ep) ((_ep)->bEndpointAddress & \
+ USB_ENDPOINT_NUMBER_MASK)
+
+static struct s3c_hsudc *the_controller;
+static const char driver_name[] = "s3c-udc";
+static const char ep0name[] = "ep0-control";
+
+static inline struct s3c_hsudc_req *our_req(struct usb_request *req)
+{
+ return container_of(req, struct s3c_hsudc_req, req);
+}
+
+static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep)
+{
+ return container_of(ep, struct s3c_hsudc_ep, ep);
+}
+
+static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget)
+{
+ return container_of(gadget, struct s3c_hsudc, gadget);
+}
+
+static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr)
+{
+ ep_addr &= USB_ENDPOINT_NUMBER_MASK;
+ writel(ep_addr, hsudc->regs + S3C_IR);
+}
+
+static inline void __orr32(void __iomem *ptr, u32 val)
+{
+ writel(readl(ptr) | val, ptr);
+}
+
+static void s3c_hsudc_init_phy(void)
+{
+ u32 cfg;
+
+ cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
+ writel(cfg, S3C2443_PWRCFG);
+
+ cfg = readl(S3C2443_URSTCON);
+ cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
+ writel(cfg, S3C2443_URSTCON);
+ mdelay(1);
+
+ cfg = readl(S3C2443_URSTCON);
+ cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
+ writel(cfg, S3C2443_URSTCON);
+
+ cfg = readl(S3C2443_PHYCTRL);
+ cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
+ cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
+ writel(cfg, S3C2443_PHYCTRL);
+
+ cfg = readl(S3C2443_PHYPWR);
+ cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
+ S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
+ S3C2443_PHYPWR_ANALOG_PD);
+ cfg |= S3C2443_PHYPWR_COMMON_ON;
+ writel(cfg, S3C2443_PHYPWR);
+
+ cfg = readl(S3C2443_UCLKCON);
+ cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
+ S3C2443_UCLKCON_TCLKEN);
+ writel(cfg, S3C2443_UCLKCON);
+}
+
+static void s3c_hsudc_uninit_phy(void)
+{
+ u32 cfg;
+
+ cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
+ writel(cfg, S3C2443_PWRCFG);
+
+ writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);
+
+ cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
+ writel(cfg, S3C2443_UCLKCON);
+}
+
+/**
+ * s3c_hsudc_complete_request - Complete a transfer request.
+ * @hsep: Endpoint to which the request belongs.
+ * @hsreq: Transfer request to be completed.
+ * @status: Transfer completion status for the transfer request.
+ */
+static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep,
+ struct s3c_hsudc_req *hsreq, int status)
+{
+ unsigned int stopped = hsep->stopped;
+ struct s3c_hsudc *hsudc = hsep->dev;
+
+ list_del_init(&hsreq->queue);
+ hsreq->req.status = status;
+
+ if (!ep_index(hsep)) {
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ hsep->bEndpointAddress &= ~USB_DIR_IN;
+ }
+
+ hsep->stopped = 1;
+ spin_unlock(&hsudc->lock);
+ if (hsreq->req.complete != NULL)
+ hsreq->req.complete(&hsep->ep, &hsreq->req);
+ spin_lock(&hsudc->lock);
+ hsep->stopped = stopped;
+}
+
+/**
+ * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint.
+ * @hsep: Endpoint for which queued requests have to be terminated.
+ * @status: Transfer completion status for the transfer request.
+ */
+static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status)
+{
+ struct s3c_hsudc_req *hsreq;
+
+ while (!list_empty(&hsep->queue)) {
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ s3c_hsudc_complete_request(hsep, hsreq, status);
+ }
+}
+
+/**
+ * s3c_hsudc_stop_activity - Stop activity on all endpoints.
+ * @hsudc: Device controller for which EP activity is to be stopped.
+ * @driver: Reference to the gadget driver which is currently active.
+ *
+ * All the endpoints are stopped and any pending transfer requests if any on
+ * the endpoint are terminated.
+ */
+static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc,
+ struct usb_gadget_driver *driver)
+{
+ struct s3c_hsudc_ep *hsep;
+ int epnum;
+
+ hsudc->gadget.speed = USB_SPEED_UNKNOWN;
+
+ for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) {
+ hsep = &hsudc->ep[epnum];
+ hsep->stopped = 1;
+ s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
+ }
+
+ spin_unlock(&hsudc->lock);
+ driver->disconnect(&hsudc->gadget);
+ spin_lock(&hsudc->lock);
+}
+
+/**
+ * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo.
+ * @hsudc: Device controller from which setup packet is to be read.
+ * @buf: The buffer into which the setup packet is read.
+ *
+ * The setup packet received in the EP0 fifo is read and stored into a
+ * given buffer address.
+ */
+
+static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf)
+{
+ int count;
+
+ count = readl(hsudc->regs + S3C_BRCR);
+ while (count--)
+ *buf++ = (u16)readl(hsudc->regs + S3C_BR(0));
+
+ writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR);
+}
+
+/**
+ * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo.
+ * @hsep: Endpoint to which the data is to be written.
+ * @hsreq: Transfer request from which the next chunk of data is written.
+ *
+ * Write the next chunk of data from a transfer request to the endpoint FIFO.
+ * If the transfer request completes, 1 is returned, otherwise 0 is returned.
+ */
+static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep,
+ struct s3c_hsudc_req *hsreq)
+{
+ u16 *buf;
+ u32 max = ep_maxpacket(hsep);
+ u32 count, length;
+ bool is_last;
+ void __iomem *fifo = hsep->fifo;
+
+ buf = hsreq->req.buf + hsreq->req.actual;
+ prefetch(buf);
+
+ length = hsreq->req.length - hsreq->req.actual;
+ length = min(length, max);
+ hsreq->req.actual += length;
+
+ writel(length, hsep->dev->regs + S3C_BWCR);
+ for (count = 0; count < length; count += 2)
+ writel(*buf++, fifo);
+
+ if (count != max) {
+ is_last = true;
+ } else {
+ if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero)
+ is_last = false;
+ else
+ is_last = true;
+ }
+
+ if (is_last) {
+ s3c_hsudc_complete_request(hsep, hsreq, 0);
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo.
+ * @hsep: Endpoint from which the data is to be read.
+ * @hsreq: Transfer request to which the next chunk of data read is written.
+ *
+ * Read the next chunk of data from the endpoint FIFO and a write it to the
+ * transfer request buffer. If the transfer request completes, 1 is returned,
+ * otherwise 0 is returned.
+ */
+static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep,
+ struct s3c_hsudc_req *hsreq)
+{
+ struct s3c_hsudc *hsudc = hsep->dev;
+ u32 csr, offset;
+ u16 *buf, word;
+ u32 buflen, rcnt, rlen;
+ void __iomem *fifo = hsep->fifo;
+ u32 is_short = 0;
+
+ offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
+ csr = readl(hsudc->regs + offset);
+ if (!(csr & S3C_ESR_RX_SUCCESS))
+ return -EINVAL;
+
+ buf = hsreq->req.buf + hsreq->req.actual;
+ prefetchw(buf);
+ buflen = hsreq->req.length - hsreq->req.actual;
+
+ rcnt = readl(hsudc->regs + S3C_BRCR);
+ rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2);
+
+ hsreq->req.actual += min(rlen, buflen);
+ is_short = (rlen < hsep->ep.maxpacket);
+
+ while (rcnt-- != 0) {
+ word = (u16)readl(fifo);
+ if (buflen) {
+ *buf++ = word;
+ buflen--;
+ } else {
+ hsreq->req.status = -EOVERFLOW;
+ }
+ }
+
+ writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset);
+
+ if (is_short || hsreq->req.actual == hsreq->req.length) {
+ s3c_hsudc_complete_request(hsep, hsreq, 0);
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * s3c_hsudc_epin_intr - Handle in-endpoint interrupt.
+ * @hsudc - Device controller for which the interrupt is to be handled.
+ * @ep_idx - Endpoint number on which an interrupt is pending.
+ *
+ * Handles interrupt for a in-endpoint. The interrupts that are handled are
+ * stall and data transmit complete interrupt.
+ */
+static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
+{
+ struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
+ struct s3c_hsudc_req *hsreq;
+ u32 csr;
+
+ csr = readl((u32)hsudc->regs + S3C_ESR);
+ if (csr & S3C_ESR_STALL) {
+ writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
+ return;
+ }
+
+ if (csr & S3C_ESR_TX_SUCCESS) {
+ writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR);
+ if (list_empty(&hsep->queue))
+ return;
+
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) &&
+ (csr & S3C_ESR_PSIF_TWO))
+ s3c_hsudc_write_fifo(hsep, hsreq);
+ }
+}
+
+/**
+ * s3c_hsudc_epout_intr - Handle out-endpoint interrupt.
+ * @hsudc - Device controller for which the interrupt is to be handled.
+ * @ep_idx - Endpoint number on which an interrupt is pending.
+ *
+ * Handles interrupt for a out-endpoint. The interrupts that are handled are
+ * stall, flush and data ready interrupt.
+ */
+static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
+{
+ struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
+ struct s3c_hsudc_req *hsreq;
+ u32 csr;
+
+ csr = readl((u32)hsudc->regs + S3C_ESR);
+ if (csr & S3C_ESR_STALL) {
+ writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
+ return;
+ }
+
+ if (csr & S3C_ESR_FLUSH) {
+ __orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH);
+ return;
+ }
+
+ if (csr & S3C_ESR_RX_SUCCESS) {
+ if (list_empty(&hsep->queue))
+ return;
+
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) &&
+ (csr & S3C_ESR_PSIF_TWO))
+ s3c_hsudc_read_fifo(hsep, hsreq);
+ }
+}
+
+/** s3c_hsudc_set_halt - Set or clear a endpoint halt.
+ * @_ep: Endpoint on which halt has to be set or cleared.
+ * @value: 1 for setting halt on endpoint, 0 to clear halt.
+ *
+ * Set or clear endpoint halt. If halt is set, the endpoint is stopped.
+ * If halt is cleared, for in-endpoints, if there are any pending
+ * transfer requests, transfers are started.
+ */
+static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value)
+{
+ struct s3c_hsudc_ep *hsep = our_ep(_ep);
+ struct s3c_hsudc *hsudc = hsep->dev;
+ struct s3c_hsudc_req *hsreq;
+ unsigned long irqflags;
+ u32 ecr;
+ u32 offset;
+
+ if (value && ep_is_in(hsep) && !list_empty(&hsep->queue))
+ return -EAGAIN;
+
+ spin_lock_irqsave(&hsudc->lock, irqflags);
+ set_index(hsudc, ep_index(hsep));
+ offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR;
+ ecr = readl(hsudc->regs + offset);
+
+ if (value) {
+ ecr |= S3C_ECR_STALL;
+ if (ep_index(hsep))
+ ecr |= S3C_ECR_FLUSH;
+ hsep->stopped = 1;
+ } else {
+ ecr &= ~S3C_ECR_STALL;
+ hsep->stopped = hsep->wedge = 0;
+ }
+ writel(ecr, hsudc->regs + offset);
+
+ if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) {
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ if (hsreq)
+ s3c_hsudc_write_fifo(hsep, hsreq);
+ }
+
+ spin_unlock_irqrestore(&hsudc->lock, irqflags);
+ return 0;
+}
+
+/** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored
+ * @_ep: Endpoint on which wedge has to be set.
+ *
+ * Sets the halt feature with the clear requests ignored.
+ */
+static int s3c_hsudc_set_wedge(struct usb_ep *_ep)
+{
+ struct s3c_hsudc_ep *hsep = our_ep(_ep);
+
+ if (!hsep)
+ return -EINVAL;
+
+ hsep->wedge = 1;
+ return usb_ep_set_halt(_ep);
+}
+
+/** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests.
+ * @_ep: Device controller on which the set/clear feature needs to be handled.
+ * @ctrl: Control request as received on the endpoint 0.
+ *
+ * Handle set feature or clear feature control requests on the control endpoint.
+ */
+static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ struct s3c_hsudc_ep *hsep;
+ bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
+ u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
+
+ if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
+ hsep = &hsudc->ep[ep_num];
+ switch (le16_to_cpu(ctrl->wValue)) {
+ case USB_ENDPOINT_HALT:
+ if (set || (!set && !hsep->wedge))
+ s3c_hsudc_set_halt(&hsep->ep, set);
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * s3c_hsudc_process_req_status - Handle get status control request.
+ * @hsudc: Device controller on which get status request has be handled.
+ * @ctrl: Control request as received on the endpoint 0.
+ *
+ * Handle get status control request received on control endpoint.
+ */
+static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0];
+ struct s3c_hsudc_req hsreq;
+ struct s3c_hsudc_ep *hsep;
+ __le16 reply;
+ u8 epnum;
+
+ switch (ctrl->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ reply = cpu_to_le16(0);
+ break;
+
+ case USB_RECIP_INTERFACE:
+ reply = cpu_to_le16(0);
+ break;
+
+ case USB_RECIP_ENDPOINT:
+ epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
+ hsep = &hsudc->ep[epnum];
+ reply = cpu_to_le16(hsep->stopped ? 1 : 0);
+ break;
+ }
+
+ INIT_LIST_HEAD(&hsreq.queue);
+ hsreq.req.length = 2;
+ hsreq.req.buf = &reply;
+ hsreq.req.actual = 0;
+ hsreq.req.complete = NULL;
+ s3c_hsudc_write_fifo(hsep0, &hsreq);
+}
+
+/**
+ * s3c_hsudc_process_setup - Process control request received on endpoint 0.
+ * @hsudc: Device controller on which control request has been received.
+ *
+ * Read the control request received on endpoint 0, decode it and handle
+ * the request.
+ */
+static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc)
+{
+ struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
+ struct usb_ctrlrequest ctrl = {0};
+ int ret;
+
+ s3c_hsudc_nuke_ep(hsep, -EPROTO);
+ s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl);
+
+ if (ctrl.bRequestType & USB_DIR_IN) {
+ hsep->bEndpointAddress |= USB_DIR_IN;
+ hsudc->ep0state = DATA_STATE_XMIT;
+ } else {
+ hsep->bEndpointAddress &= ~USB_DIR_IN;
+ hsudc->ep0state = DATA_STATE_RECV;
+ }
+
+ switch (ctrl.bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+ break;
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ return;
+
+ case USB_REQ_GET_STATUS:
+ if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
+ break;
+ s3c_hsudc_process_req_status(hsudc, &ctrl);
+ return;
+
+ case USB_REQ_SET_FEATURE:
+ case USB_REQ_CLEAR_FEATURE:
+ if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
+ break;
+ s3c_hsudc_handle_reqfeat(hsudc, &ctrl);
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ return;
+ }
+
+ if (hsudc->driver) {
+ spin_unlock(&hsudc->lock);
+ ret = hsudc->driver->setup(&hsudc->gadget, &ctrl);
+ spin_lock(&hsudc->lock);
+
+ if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
+ hsep->bEndpointAddress &= ~USB_DIR_IN;
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ }
+
+ if (ret < 0) {
+ dev_err(hsudc->dev, "setup failed, returned %d\n",
+ ret);
+ s3c_hsudc_set_halt(&hsep->ep, 1);
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ hsep->bEndpointAddress &= ~USB_DIR_IN;
+ }
+ }
+}
+
+/** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt.
+ * @hsudc: Device controller on which endpoint 0 interrupt has occured.
+ *
+ * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur
+ * when a stall handshake is sent to host or data is sent/received on
+ * endpoint 0.
+ */
+static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc)
+{
+ struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
+ struct s3c_hsudc_req *hsreq;
+ u32 csr = readl(hsudc->regs + S3C_EP0SR);
+ u32 ecr;
+
+ if (csr & S3C_EP0SR_STALL) {
+ ecr = readl(hsudc->regs + S3C_EP0CR);
+ ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH);
+ writel(ecr, hsudc->regs + S3C_EP0CR);
+
+ writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR);
+ hsep->stopped = 0;
+
+ s3c_hsudc_nuke_ep(hsep, -ECONNABORTED);
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ hsep->bEndpointAddress &= ~USB_DIR_IN;
+ return;
+ }
+
+ if (csr & S3C_EP0SR_TX_SUCCESS) {
+ writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR);
+ if (ep_is_in(hsep)) {
+ if (list_empty(&hsep->queue))
+ return;
+
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ s3c_hsudc_write_fifo(hsep, hsreq);
+ }
+ }
+
+ if (csr & S3C_EP0SR_RX_SUCCESS) {
+ if (hsudc->ep0state == WAIT_FOR_SETUP)
+ s3c_hsudc_process_setup(hsudc);
+ else {
+ if (!ep_is_in(hsep)) {
+ if (list_empty(&hsep->queue))
+ return;
+ hsreq = list_entry(hsep->queue.next,
+ struct s3c_hsudc_req, queue);
+ s3c_hsudc_read_fifo(hsep, hsreq);
+ }
+ }
+ }
+}
+
+/**
+ * s3c_hsudc_ep_enable - Enable a endpoint.
+ * @_ep: The endpoint to be enabled.
+ * @desc: Endpoint descriptor.
+ *
+ * Enables a endpoint when called from the gadget driver. Endpoint stall if
+ * any is cleared, transfer type is configured and endpoint interrupt is
+ * enabled.
+ */
+static int s3c_hsudc_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct s3c_hsudc_ep *hsep;
+ struct s3c_hsudc *hsudc;
+ unsigned long flags;
+ u32 ecr = 0;
+
+ hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+ if (!_ep || !desc || hsep->desc || _ep->name == ep0name
+ || desc->bDescriptorType != USB_DT_ENDPOINT
+ || hsep->bEndpointAddress != desc->bEndpointAddress
+ || ep_maxpacket(hsep) < le16_to_cpu(desc->wMaxPacketSize))
+ return -EINVAL;
+
+ if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
+ && le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(hsep))
+ || !desc->wMaxPacketSize)
+ return -ERANGE;
+
+ hsudc = hsep->dev;
+ if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&hsudc->lock, flags);
+
+ set_index(hsudc, hsep->bEndpointAddress);
+ ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN);
+ writel(ecr, hsudc->regs + S3C_ECR);
+
+ hsep->stopped = hsep->wedge = 0;
+ hsep->desc = desc;
+ hsep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+
+ s3c_hsudc_set_halt(_ep, 0);
+ __set_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
+
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return 0;
+}
+
+/**
+ * s3c_hsudc_ep_disable - Disable a endpoint.
+ * @_ep: The endpoint to be disabled.
+ * @desc: Endpoint descriptor.
+ *
+ * Disables a endpoint when called from the gadget driver.
+ */
+static int s3c_hsudc_ep_disable(struct usb_ep *_ep)
+{
+ struct s3c_hsudc_ep *hsep = our_ep(_ep);
+ struct s3c_hsudc *hsudc = hsep->dev;
+ unsigned long flags;
+
+ if (!_ep || !hsep->desc)
+ return -EINVAL;
+
+ spin_lock_irqsave(&hsudc->lock, flags);
+
+ set_index(hsudc, hsep->bEndpointAddress);
+ __clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
+
+ s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
+
+ hsep->desc = 0;
+ hsep->stopped = 1;
+
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return 0;
+}
+
+/**
+ * s3c_hsudc_alloc_request - Allocate a new request.
+ * @_ep: Endpoint for which request is allocated (not used).
+ * @gfp_flags: Flags used for the allocation.
+ *
+ * Allocates a single transfer request structure when called from gadget driver.
+ */
+static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep,
+ gfp_t gfp_flags)
+{
+ struct s3c_hsudc_req *hsreq;
+
+ hsreq = kzalloc(sizeof *hsreq, gfp_flags);
+ if (!hsreq)
+ return 0;
+
+ INIT_LIST_HEAD(&hsreq->queue);
+ return &hsreq->req;
+}
+
+/**
+ * s3c_hsudc_free_request - Deallocate a request.
+ * @ep: Endpoint for which request is deallocated (not used).
+ * @_req: Request to be deallocated.
+ *
+ * Allocates a single transfer request structure when called from gadget driver.
+ */
+static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req)
+{
+ struct s3c_hsudc_req *hsreq;
+
+ hsreq = container_of(_req, struct s3c_hsudc_req, req);
+ WARN_ON(!list_empty(&hsreq->queue));
+ kfree(hsreq);
+}
+
+/**
+ * s3c_hsudc_queue - Queue a transfer request for the endpoint.
+ * @_ep: Endpoint for which the request is queued.
+ * @_req: Request to be queued.
+ * @gfp_flags: Not used.
+ *
+ * Start or enqueue a request for a endpoint when called from gadget driver.
+ */
+static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t gfp_flags)
+{
+ struct s3c_hsudc_req *hsreq;
+ struct s3c_hsudc_ep *hsep;
+ struct s3c_hsudc *hsudc;
+ unsigned long flags;
+ u32 offset;
+ u32 csr;
+
+ hsreq = container_of(_req, struct s3c_hsudc_req, req);
+ if ((!_req || !_req->complete || !_req->buf ||
+ !list_empty(&hsreq->queue)))
+ return -EINVAL;
+
+ hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+ hsudc = hsep->dev;
+ if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&hsudc->lock, flags);
+ set_index(hsudc, hsep->bEndpointAddress);
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+
+ if (!ep_index(hsep) && _req->length == 0) {
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ s3c_hsudc_complete_request(hsep, hsreq, 0);
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return 0;
+ }
+
+ if (list_empty(&hsep->queue) && !hsep->stopped) {
+ offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
+ if (ep_is_in(hsep)) {
+ csr = readl((u32)hsudc->regs + offset);
+ if (!(csr & S3C_ESR_TX_SUCCESS) &&
+ (s3c_hsudc_write_fifo(hsep, hsreq) == 1))
+ hsreq = 0;
+ } else {
+ csr = readl((u32)hsudc->regs + offset);
+ if ((csr & S3C_ESR_RX_SUCCESS)
+ && (s3c_hsudc_read_fifo(hsep, hsreq) == 1))
+ hsreq = 0;
+ }
+ }
+
+ if (hsreq != 0)
+ list_add_tail(&hsreq->queue, &hsep->queue);
+
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return 0;
+}
+
+/**
+ * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint.
+ * @_ep: Endpoint from which the request is dequeued.
+ * @_req: Request to be dequeued.
+ *
+ * Dequeue a request from a endpoint when called from gadget driver.
+ */
+static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct s3c_hsudc_ep *hsep = our_ep(_ep);
+ struct s3c_hsudc *hsudc = hsep->dev;
+ struct s3c_hsudc_req *hsreq;
+ unsigned long flags;
+
+ hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+ if (!_ep || hsep->ep.name == ep0name)
+ return -EINVAL;
+
+ spin_lock_irqsave(&hsudc->lock, flags);
+
+ list_for_each_entry(hsreq, &hsep->queue, queue) {
+ if (&hsreq->req == _req)
+ break;
+ }
+ if (&hsreq->req != _req) {
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return -EINVAL;
+ }
+
+ set_index(hsudc, hsep->bEndpointAddress);
+ s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET);
+
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+ return 0;
+}
+
+static struct usb_ep_ops s3c_hsudc_ep_ops = {
+ .enable = s3c_hsudc_ep_enable,
+ .disable = s3c_hsudc_ep_disable,
+ .alloc_request = s3c_hsudc_alloc_request,
+ .free_request = s3c_hsudc_free_request,
+ .queue = s3c_hsudc_queue,
+ .dequeue = s3c_hsudc_dequeue,
+ .set_halt = s3c_hsudc_set_halt,
+ .set_wedge = s3c_hsudc_set_wedge,
+};
+
+/**
+ * s3c_hsudc_initep - Initialize a endpoint to default state.
+ * @hsudc - Reference to the device controller.
+ * @hsep - Endpoint to be initialized.
+ * @epnum - Address to be assigned to the endpoint.
+ *
+ * Initialize a endpoint with default configuration.
+ */
+static void s3c_hsudc_initep(struct s3c_hsudc *hsudc,
+ struct s3c_hsudc_ep *hsep, int epnum)
+{
+ char *dir;
+
+ if ((epnum % 2) == 0) {
+ dir = "out";
+ } else {
+ dir = "in";
+ hsep->bEndpointAddress = USB_DIR_IN;
+ }
+
+ hsep->bEndpointAddress |= epnum;
+ if (epnum)
+ snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir);
+ else
+ snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name);
+
+ INIT_LIST_HEAD(&hsep->queue);
+ INIT_LIST_HEAD(&hsep->ep.ep_list);
+ if (epnum)
+ list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list);
+
+ hsep->dev = hsudc;
+ hsep->ep.name = hsep->name;
+ hsep->ep.maxpacket = epnum ? 512 : 64;
+ hsep->ep.ops = &s3c_hsudc_ep_ops;
+ hsep->fifo = hsudc->regs + S3C_BR(epnum);
+ hsep->desc = 0;
+ hsep->stopped = 0;
+ hsep->wedge = 0;
+
+ set_index(hsudc, epnum);
+ writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR);
+}
+
+/**
+ * s3c_hsudc_setup_ep - Configure all endpoints to default state.
+ * @hsudc: Reference to device controller.
+ *
+ * Configures all endpoints to default state.
+ */
+static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc)
+{
+ int epnum;
+
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ INIT_LIST_HEAD(&hsudc->gadget.ep_list);
+ for (epnum = 0; epnum < hsudc->pd->epnum; epnum++)
+ s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum);
+}
+
+/**
+ * s3c_hsudc_reconfig - Reconfigure the device controller to default state.
+ * @hsudc: Reference to device controller.
+ *
+ * Reconfigures the device controller registers to a default state.
+ */
+static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc)
+{
+ writel(0xAA, hsudc->regs + S3C_EDR);
+ writel(1, hsudc->regs + S3C_EIER);
+ writel(0, hsudc->regs + S3C_TR);
+ writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN |
+ S3C_SCR_RST_EN, hsudc->regs + S3C_SCR);
+ writel(0, hsudc->regs + S3C_EP0CR);
+
+ s3c_hsudc_setup_ep(hsudc);
+}
+
+/**
+ * s3c_hsudc_irq - Interrupt handler for device controller.
+ * @irq: Not used.
+ * @_dev: Reference to the device controller.
+ *
+ * Interrupt handler for the device controller. This handler handles controller
+ * interrupts and endpoint interrupts.
+ */
+static irqreturn_t s3c_hsudc_irq(int irq, void *_dev)
+{
+ struct s3c_hsudc *hsudc = _dev;
+ struct s3c_hsudc_ep *hsep;
+ u32 ep_intr;
+ u32 sys_status;
+ u32 ep_idx;
+
+ spin_lock(&hsudc->lock);
+
+ sys_status = readl(hsudc->regs + S3C_SSR);
+ ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF;
+
+ if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) {
+ spin_unlock(&hsudc->lock);
+ return IRQ_HANDLED;
+ }
+
+ if (sys_status) {
+ if (sys_status & S3C_SSR_VBUSON)
+ writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR);
+
+ if (sys_status & S3C_SSR_ERR)
+ writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR);
+
+ if (sys_status & S3C_SSR_SDE) {
+ writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR);
+ hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ?
+ USB_SPEED_HIGH : USB_SPEED_FULL;
+ }
+
+ if (sys_status & S3C_SSR_SUSPEND) {
+ writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR);
+ if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
+ && hsudc->driver && hsudc->driver->suspend)
+ hsudc->driver->suspend(&hsudc->gadget);
+ }
+
+ if (sys_status & S3C_SSR_RESUME) {
+ writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR);
+ if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
+ && hsudc->driver && hsudc->driver->resume)
+ hsudc->driver->resume(&hsudc->gadget);
+ }
+
+ if (sys_status & S3C_SSR_RESET) {
+ writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR);
+ for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) {
+ hsep = &hsudc->ep[ep_idx];
+ hsep->stopped = 1;
+ s3c_hsudc_nuke_ep(hsep, -ECONNRESET);
+ }
+ s3c_hsudc_reconfig(hsudc);
+ hsudc->ep0state = WAIT_FOR_SETUP;
+ }
+ }
+
+ if (ep_intr & S3C_EIR_EP0) {
+ writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR);
+ set_index(hsudc, 0);
+ s3c_hsudc_handle_ep0_intr(hsudc);
+ }
+
+ ep_intr >>= 1;
+ ep_idx = 1;
+ while (ep_intr) {
+ if (ep_intr & 1) {
+ hsep = &hsudc->ep[ep_idx];
+ set_index(hsudc, ep_idx);
+ writel(1 << ep_idx, hsudc->regs + S3C_EIR);
+ if (ep_is_in(hsep))
+ s3c_hsudc_epin_intr(hsudc, ep_idx);
+ else
+ s3c_hsudc_epout_intr(hsudc, ep_idx);
+ }
+ ep_intr >>= 1;
+ ep_idx++;
+ }
+
+ spin_unlock(&hsudc->lock);
+ return IRQ_HANDLED;
+}
+
+int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+ int (*bind)(struct usb_gadget *))
+{
+ struct s3c_hsudc *hsudc = the_controller;
+ int ret;
+
+ if (!driver
+ || (driver->speed != USB_SPEED_FULL &&
+ driver->speed != USB_SPEED_HIGH)
+ || !bind
+ || !driver->unbind || !driver->disconnect || !driver->setup)
+ return -EINVAL;
+
+ if (!hsudc)
+ return -ENODEV;
+
+ if (hsudc->driver)
+ return -EBUSY;
+
+ hsudc->driver = driver;
+ hsudc->gadget.dev.driver = &driver->driver;
+ hsudc->gadget.speed = USB_SPEED_UNKNOWN;
+ ret = device_add(&hsudc->gadget.dev);
+ if (ret) {
+ dev_err(hsudc->dev, "failed to probe gadget device");
+ return ret;
+ }
+
+ ret = bind(&hsudc->gadget);
+ if (ret) {
+ dev_err(hsudc->dev, "%s: bind failed\n", hsudc->gadget.name);
+ device_del(&hsudc->gadget.dev);
+
+ hsudc->driver = NULL;
+ hsudc->gadget.dev.driver = NULL;
+ return ret;
+ }
+
+ enable_irq(hsudc->irq);
+ dev_info(hsudc->dev, "bound driver %s\n", driver->driver.name);
+
+ s3c_hsudc_reconfig(hsudc);
+ s3c_hsudc_init_phy();
+ if (hsudc->pd->gpio_init)
+ hsudc->pd->gpio_init();
+
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_probe_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+ struct s3c_hsudc *hsudc = the_controller;
+ unsigned long flags;
+
+ if (!hsudc)
+ return -ENODEV;
+
+ if (!driver || driver != hsudc->driver || !driver->unbind)
+ return -EINVAL;
+
+ spin_lock_irqsave(&hsudc->lock, flags);
+ hsudc->driver = 0;
+ s3c_hsudc_uninit_phy();
+ if (hsudc->pd->gpio_uninit)
+ hsudc->pd->gpio_uninit();
+ s3c_hsudc_stop_activity(hsudc, driver);
+ spin_unlock_irqrestore(&hsudc->lock, flags);
+
+ driver->unbind(&hsudc->gadget);
+ device_del(&hsudc->gadget.dev);
+ disable_irq(hsudc->irq);
+
+ dev_info(hsudc->dev, "unregistered gadget driver '%s'\n",
+ driver->driver.name);
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc)
+{
+ return readl(hsudc->regs + S3C_FNR) & 0x3FF;
+}
+
+static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget)
+{
+ return s3c_hsudc_read_frameno(to_hsudc(gadget));
+}
+
+static struct usb_gadget_ops s3c_hsudc_gadget_ops = {
+ .get_frame = s3c_hsudc_gadget_getframe,
+};
+
+static int s3c_hsudc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct s3c_hsudc *hsudc;
+ struct s3c24xx_hsudc_platdata *pd = pdev->dev.platform_data;
+ int ret;
+
+ hsudc = kzalloc(sizeof(struct s3c_hsudc) +
+ sizeof(struct s3c_hsudc_ep) * pd->epnum,
+ GFP_KERNEL);
+ if (!hsudc) {
+ dev_err(dev, "cannot allocate memory\n");
+ return -ENOMEM;
+ }
+
+ the_controller = hsudc;
+ platform_set_drvdata(pdev, dev);
+ hsudc->dev = dev;
+ hsudc->pd = pdev->dev.platform_data;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "unable to obtain driver resource data\n");
+ ret = -ENODEV;
+ goto err_res;
+ }
+
+ hsudc->mem_rsrc = request_mem_region(res->start, resource_size(res),
+ dev_name(&pdev->dev));
+ if (!hsudc->mem_rsrc) {
+ dev_err(dev, "failed to reserve register area\n");
+ ret = -ENODEV;
+ goto err_res;
+ }
+
+ hsudc->regs = ioremap(res->start, resource_size(res));
+ if (!hsudc->regs) {
+ dev_err(dev, "error mapping device register area\n");
+ ret = -EBUSY;
+ goto err_remap;
+ }
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0) {
+ dev_err(dev, "unable to obtain IRQ number\n");
+ goto err_irq;
+ }
+ hsudc->irq = ret;
+
+ ret = request_irq(hsudc->irq, s3c_hsudc_irq, 0, driver_name, hsudc);
+ if (ret < 0) {
+ dev_err(dev, "irq request failed\n");
+ goto err_irq;
+ }
+
+ spin_lock_init(&hsudc->lock);
+
+ device_initialize(&hsudc->gadget.dev);
+ dev_set_name(&hsudc->gadget.dev, "gadget");
+
+ hsudc->gadget.is_dualspeed = 1;
+ hsudc->gadget.ops = &s3c_hsudc_gadget_ops;
+ hsudc->gadget.name = dev_name(dev);
+ hsudc->gadget.dev.parent = dev;
+ hsudc->gadget.dev.dma_mask = dev->dma_mask;
+ hsudc->gadget.ep0 = &hsudc->ep[0].ep;
+
+ hsudc->gadget.is_otg = 0;
+ hsudc->gadget.is_a_peripheral = 0;
+
+ s3c_hsudc_setup_ep(hsudc);
+
+ hsudc->uclk = clk_get(&pdev->dev, "usb-device");
+ if (hsudc->uclk == NULL) {
+ dev_err(dev, "failed to find usb-device clock source\n");
+ return -ENOENT;
+ }
+ clk_enable(hsudc->uclk);
+
+ local_irq_disable();
+
+ disable_irq(hsudc->irq);
+ local_irq_enable();
+ return 0;
+
+err_irq:
+ iounmap(hsudc->regs);
+
+err_remap:
+ release_resource(hsudc->mem_rsrc);
+ kfree(hsudc->mem_rsrc);
+
+err_res:
+ kfree(hsudc);
+ return ret;
+}
+
+static struct platform_driver s3c_hsudc_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "s3c-hsudc",
+ },
+ .probe = s3c_hsudc_probe,
+};
+
+static int __init s3c_hsudc_modinit(void)
+{
+ return platform_driver_register(&s3c_hsudc_driver);
+}
+
+static void __exit s3c_hsudc_modexit(void)
+{
+ platform_driver_unregister(&s3c_hsudc_driver);
+}
+
+module_init(s3c_hsudc_modinit);
+module_exit(s3c_hsudc_modexit);
+
+MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver");
+MODULE_AUTHOR("Thomas Abraham <thomas.ab at samsung.com>");
+MODULE_LICENSE("GPL");
--
1.7.2.3
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