[PATCH 1/3] usb: gadget: add Aspeed ast2600 udc driver

Neal Liu
2022-05-13T07:00:27Z

Aspeed udc is compliant with USB2.0, supports USB High Speed
and Full Speed, backward compatible with USB1.1.

Supports independent DMA channel for each generic endpoint.
Supports 32/256 stages descriptor mode for all generic endpoints.

This driver supports full functionality including single/multiple
stages descriptor mode, and exposes 1 UDC gadget driver.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
---
MAINTAINERS | 7 +
drivers/usb/gadget/udc/Kconfig | 13 +
drivers/usb/gadget/udc/Makefile | 1 +
drivers/usb/gadget/udc/aspeed_udc.c | 1594 +++++++++++++++++++++++++++
4 files changed, 1615 insertions(+)
create mode 100644 drivers/usb/gadget/udc/aspeed_udc.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e8c52d0192a6..784d8d8e7b22 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3109,6 +3109,13 @@ S: Maintained
F: Documentation/devicetree/bindings/media/aspeed-video.txt
F: drivers/media/platform/aspeed/

+ASPEED USB UDC DRIVER
+M: Neal Liu <neal_liu@aspeedtech.com>
+L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
+S: Maintained
+F: Documentation/devicetree/bindings/usb/aspeed,udc.yaml
+F: drivers/usb/gadget/udc/aspeed_udc.c
+
ASUS NOTEBOOKS AND EEEPC ACPI/WMI EXTRAS DRIVERS
M: Corentin Chary <corentin.chary@gmail.com>
L: acpi4asus-user@lists.sourceforge.net
diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 69394dc1cdfb..03535f33511b 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -463,6 +463,19 @@ config USB_TEGRA_XUDC
dynamically linked module called "tegra_xudc" and force all
gadget drivers to also be dynamically linked.

+config USB_ASPEED_UDC
+ tristate "Aspeed UDC driver support"
+ depends on ARCH_ASPEED || COMPILE_TEST
+ depends on USB_LIBCOMPOSITE
+ help
+ Enables Aspeed USB2.0 Device Controller driver for AST260x
+ family SoCs. The controller supports 1 control endpoint and
+ 4 programmable endpoints.
+
+ Say "y" to link the driver statically, or "m" to build a
+ dynamically linked module called "aspeed_udc" and force all
+ gadget drivers to also be dynamically linked.
+
source "drivers/usb/gadget/udc/aspeed-vhub/Kconfig"

#
diff --git a/drivers/usb/gadget/udc/Makefile b/drivers/usb/gadget/udc/Makefile
index a21f2224e7eb..12f9e4c9eb0c 100644
--- a/drivers/usb/gadget/udc/Makefile
+++ b/drivers/usb/gadget/udc/Makefile
@@ -40,5 +40,6 @@ obj-$(CONFIG_USB_GR_UDC) += gr_udc.o
obj-$(CONFIG_USB_GADGET_XILINX) += udc-xilinx.o
obj-$(CONFIG_USB_SNP_UDC_PLAT) += snps_udc_plat.o
obj-$(CONFIG_USB_ASPEED_VHUB) += aspeed-vhub/
+obj-$(CONFIG_USB_ASPEED_UDC) += aspeed_udc.o
obj-$(CONFIG_USB_BDC_UDC) += bdc/
obj-$(CONFIG_USB_MAX3420_UDC) += max3420_udc.o
diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c
new file mode 100644
index 000000000000..f2756f099482
--- /dev/null
+++ b/drivers/usb/gadget/udc/aspeed_udc.c
@@ -0,0 +1,1594 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 Aspeed Technology Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/prefetch.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/slab.h>
+
+#define AST_UDC_NUM_ENDPOINTS (1 + 4)
+#define AST_UDC_EP0_MAX_PACKET 64 /* EP0's max packet size */
+#define AST_UDC_EPn_MAX_PACKET 1024 /* Generic EPs max packet size */
+#define AST_UDC_DESCS_COUNT 256 /* Use 256 stages descriptor mode (32/256) */
+#define AST_UDC_DESC_MODE 1 /* Single/Multiple Stage(s) Descriptor Mode */
+
+#define AST_UDC_EP_DMA_SIZE (AST_UDC_EPn_MAX_PACKET + 8 * AST_UDC_DESCS_COUNT)
+
+/*****************************
+ * *
+ * UDC register definitions *
+ * *
+ *****************************/
+
+#define AST_UDC_FUNC_CTRL 0x00 /* Root Function Control & Status Register */
+#define AST_UDC_CONFIG 0x04 /* Root Configuration Setting Register */
+#define AST_UDC_IER 0x08 /* Interrupt Control Register */
+#define AST_UDC_ISR 0x0C /* Interrupt Status Register */
+#define AST_UDC_EP_ACK_IER 0x10 /* Programmable ep Pool ACK Interrupt Enable Reg */
+#define AST_UDC_EP_NAK_IER 0x14 /* Programmable ep Pool NAK Interrupt Enable Reg */
+#define AST_UDC_EP_ACK_ISR 0x18 /* Programmable ep Pool ACK Interrupt Status Reg */
+#define AST_UDC_EP_NAK_ISR 0x1C /* Programmable ep Pool NAK Interrupt Status Reg */
+#define AST_UDC_DEV_RESET 0x20 /* Device Controller Soft Reset Enable Register */
+#define AST_UDC_STS 0x24 /* USB Status Register */
+#define AST_VHUB_EP_DATA 0x28 /* Programmable ep Pool Data Toggle Value Set */
+#define AST_VHUB_ISO_TX_FAIL 0x2C /* Isochronous Transaction Fail Accumulator */
+#define AST_UDC_EP0_CTRL 0x30 /* Endpoint 0 Control/Status Register */
+#define AST_UDC_EP0_DATA_BUFF 0x34 /* Base Address of ep0 IN/OUT Data Buffer Reg */
+#define AST_UDC_SETUP0 0x80 /* Root Device Setup Data Buffer0 */
+#define AST_UDC_SETUP1 0x84 /* Root Device Setup Data Buffer1 */
+
+
+/* Main control reg */
+#define USB_PHY_CLK_EN BIT(31)
+#define USB_FIFO_DYN_PWRD_EN BIT(19)
+#define USB_EP_LONG_DESC BIT(18)
+#define USB_BIST_TEST_PASS BIT(13)
+#define USB_BIST_TURN_ON BIT(12)
+#define USB_PHY_RESET_DIS BIT(11)
+#define USB_TEST_MODE(x) ((x) << 8)
+#define USB_FORCE_TIMER_HS BIT(7)
+#define USB_FORCE_HS BIT(6)
+#define USB_REMOTE_WAKEUP_12MS BIT(5)
+#define USB_REMOTE_WAKEUP_EN BIT(4)
+#define USB_AUTO_REMOTE_WAKEUP_EN BIT(3)
+#define USB_STOP_CLK_IN_SUPEND BIT(2)
+#define USB_UPSTREAM_FS BIT(1)
+#define USB_UPSTREAM_EN BIT(0)
+
+/* Interrupt ctrl & status reg */
+#define UDC_IRQ_EP_POOL_NAK BIT(17)
+#define UDC_IRQ_EP_POOL_ACK_STALL BIT(16)
+#define UDC_IRQ_BUS_RESUME BIT(8)
+#define UDC_IRQ_BUS_SUSPEND BIT(7)
+#define UDC_IRQ_BUS_RESET BIT(6)
+#define UDC_IRQ_EP0_IN_DATA_NAK BIT(4)
+#define UDC_IRQ_EP0_IN_ACK_STALL BIT(3)
+#define UDC_IRQ_EP0_OUT_NAK BIT(2)
+#define UDC_IRQ_EP0_OUT_ACK_STALL BIT(1)
+#define UDC_IRQ_EP0_SETUP BIT(0)
+#define UDC_IRQ_ACK_ALL (0x1ff)
+
+/* EP isr reg */
+#define USB_EP3_ISR BIT(3)
+#define USB_EP2_ISR BIT(2)
+#define USB_EP1_ISR BIT(1)
+#define USB_EP0_ISR BIT(0)
+#define UDC_IRQ_EP_ACK_ALL (0xf)
+
+/*Soft reset reg */
+#define ROOT_UDC_SOFT_RESET BIT(0)
+
+/* USB status reg */
+#define UDC_STS_HIGHSPEED BIT(27)
+
+/* Programmable EP data toggle */
+#define EP_TOGGLE_SET_EPNUM(x) ((x) & 0x3)
+
+/* EP0 ctrl reg */
+#define EP0_GET_RX_LEN(x) ((x >> 16) & 0x7f)
+#define EP0_TX_LEN(x) ((x & 0x7f) << 8)
+#define EP0_RX_BUFF_RDY BIT(2)
+#define EP0_TX_BUFF_RDY BIT(1)
+#define EP0_STALL BIT(0)
+
+/*************************************
+ * *
+ * per-endpoint register definitions *
+ * *
+ *************************************/
+
+#define AST_UDC_EP_CONFIG 0x00 /* Endpoint Configuration Register */
+#define AST_UDC_EP_DMA_CTRL 0x04 /* DMA Descriptor List Control/Status Register */
+#define AST_UDC_EP_DMA_BUFF 0x08 /* DMA Descriptor/Buffer Base Address */
+#define AST_UDC_EP_DMA_STS 0x0C /* DMA Descriptor List R/W Pointer and Status */
+
+#define AST_UDC_EP_BASE 0x200
+#define AST_UDC_EP_OFFSET 0x10
+
+/* EP config reg */
+#define EP_SET_MAX_PKT(x) ((x & 0x3ff) << 16)
+#define EP_DATA_FETCH_CTRL(x) ((x & 0x3) << 14)
+#define EP_AUTO_DATA_DISABLE (0x1 << 13)
+#define EP_SET_EP_STALL (0x1 << 12)
+#define EP_SET_EP_NUM(x) ((x & 0xf) << 8)
+#define EP_SET_TYPE_MASK(x) ((x) << 5)
+#define EP_TYPE_BULK (0x1)
+#define EP_TYPE_INT (0x2)
+#define EP_TYPE_ISO (0x3)
+#define EP_DIR_OUT (0x1 << 4)
+#define EP_ALLOCATED_MASK (0x7 << 1)
+#define EP_ENABLE BIT(0)
+
+/* EP DMA ctrl reg */
+#define EP_DMA_CTRL_GET_PROC_STS(x) ((x >> 4) & 0xf)
+#define EP_DMA_CTRL_STS_RX_IDLE 0x0
+#define EP_DMA_CTRL_STS_TX_IDLE 0x8
+#define EP_DMA_CTRL_IN_LONG_MODE (0x1 << 3)
+#define EP_DMA_CTRL_RESET (0x1 << 2)
+#define EP_DMA_SINGLE_STAGE (0x1 << 1)
+#define EP_DMA_DESC_MODE (0x1 << 0)
+
+/* EP DMA status reg */
+#define EP_DMA_SET_TX_SIZE(x) ((x & 0x7ff) << 16)
+#define EP_DMA_GET_TX_SIZE(x) (((x) >> 16) & 0x7ff)
+#define EP_DMA_GET_RPTR(x) (((x) >> 8) & 0xff)
+#define EP_DMA_GET_WPTR(x) ((x) & 0xff)
+#define EP_DMA_SINGLE_KICK (1 << 0) /* WPTR = 1 for single mode */
+
+/* EP desc reg */
+#define AST_EP_DMA_DESC_INTR_ENABLE BIT(31)
+#define AST_EP_DMA_DESC_PID_DATA0 (0 << 14)
+#define AST_EP_DMA_DESC_PID_DATA2 BIT(14)
+#define AST_EP_DMA_DESC_PID_DATA1 (2 << 14)
+#define AST_EP_DMA_DESC_PID_MDATA (3 << 14)
+#define EP_DESC1_IN_LEN(x) ((x) & 0x1fff)
+#define AST_EP_DMA_DESC_MAX_LEN (7680) /* Max packet length for trasmit in 1 desc */
+
+struct ast_udc_request {
+ struct usb_request req;
+ struct list_head queue;
+ unsigned mapped:1;
+ unsigned int actual_dma_length;
+ u32 saved_dma_wptr;
+};
+
+#define to_ast_req(__req) container_of(__req, struct ast_udc_request, req)
+
+struct ast_dma_desc {
+ u32 des_0;
+ u32 des_1;
+};
+
+struct ast_udc_ep {
+ struct usb_ep ep;
+
+ /* Request queue */
+ struct list_head queue;
+
+ struct ast_udc_dev *udc;
+ void __iomem *ep_reg;
+ void *epn_buf;
+ dma_addr_t epn_buf_dma;
+ const struct usb_endpoint_descriptor *desc;
+
+ /* DMA Descriptors */
+ struct ast_dma_desc *descs;
+ dma_addr_t descs_dma;
+ u32 descs_wptr;
+ u32 chunk_max;
+
+ bool dir_in:1;
+ unsigned stopped:1;
+ bool desc_mode:1;
+};
+
+#define to_ast_ep(__ep) container_of(__ep, struct ast_udc_ep, ep)
+
+struct ast_udc_dev {
+ struct platform_device *pdev;
+ void __iomem *reg;
+ int irq;
+ spinlock_t lock;
+ struct clk *clk;
+ struct work_struct wake_work;
+
+ /* EP0 DMA buffers allocated in one chunk */
+ void *ep0_buf;
+ dma_addr_t ep0_buf_dma;
+ struct ast_udc_ep ep[AST_UDC_NUM_ENDPOINTS];
+
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+ struct usb_ctrlrequest *creq;
+ enum usb_device_state suspended_from;
+ int desc_mode;
+
+ /* Force full speed only */
+ bool force_usb1:1;
+ unsigned is_control_tx:1;
+ bool wakeup_en:1;
+};
+
+#define to_ast_dev(__g) container_of(__g, struct ast_udc_dev, gadget)
+
+static const char * const ast_ep_name[] = {
+ "ep0", "ep1", "ep2", "ep3", "ep4"
+};
+
+#ifdef AST_UDC_DEBUG_ALL
+#define AST_UDC_DEBUG
+#define AST_SETUP_DEBUG
+#define AST_EP_DEBUG
+#define AST_ISR_DEBUG
+#endif
+
+#ifdef AST_SETUP_DEBUG
+#define SETUP_DBG(u, fmt, ...) \
+ dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
+#else
+#define SETUP_DBG(u, fmt, ...)
+#endif
+
+#ifdef AST_EP_DEBUG
+#define EP_DBG(e, fmt, ...) \
+ dev_dbg(&(e)->udc->pdev->dev, "%s():%s " fmt, __func__, \
+ (e)->ep.name, ##__VA_ARGS__)
+#else
+#define EP_DBG(ep, fmt, ...) ((void)(ep))
+#endif
+
+#ifdef AST_UDC_DEBUG
+#define UDC_DBG(u, fmt, ...) \
+ dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
+#else
+#define UDC_DBG(u, fmt, ...)
+#endif
+
+#ifdef AST_ISR_DEBUG
+#define ISR_DBG(u, fmt, ...) \
+ dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
+#else
+#define ISR_DBG(u, fmt, ...)
+#endif
+
+/*-------------------------------------------------------------------------*/
+#define ast_udc_read(udc, offset) \
+ readl((udc)->reg + (offset))
+#define ast_udc_write(udc, val, offset) \
+ writel((val), (udc)->reg + (offset))
+
+#define ast_ep_read(ep, reg) \
+ readl((ep)->ep_reg + (reg))
+#define ast_ep_write(ep, val, reg) \
+ writel((val), (ep)->ep_reg + (reg))
+
+/*-------------------------------------------------------------------------*/
+
+static void ast_udc_done(struct ast_udc_ep *ep, struct ast_udc_request *req,
+ int status)
+{
+ struct ast_udc_dev *udc = ep->udc;
+
+ EP_DBG(ep, "req @%p, len (%d/%d), buf:0x%x, dir:0x%x\n",
+ req, req->req.actual, req->req.length,
+ (u32)req->req.buf, ep->dir_in);
+
+ list_del(&req->queue);
+
+ if (req->req.status == -EINPROGRESS)
+ req->req.status = status;
+ else
+ status = req->req.status;
+
+ if (status && status != -ESHUTDOWN)
+ EP_DBG(ep, "done req:%p, status:%d\n", req, status);
+
+ spin_unlock(&udc->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&udc->lock);
+}
+
+static void ast_udc_nuke(struct ast_udc_ep *ep, int status)
+{
+ int count = 0;
+
+ /* Sanity check */
+ if (&ep->queue == NULL)
+ return;
+
+ while (!list_empty(&ep->queue)) {
+ struct ast_udc_request *req;
+
+ req = list_entry(ep->queue.next, struct ast_udc_request,
+ queue);
+ ast_udc_done(ep, req, status);
+ count++;
+ }
+
+ if (count)
+ EP_DBG(ep, "Nuked %d request(s)\n", count);
+}
+
+/*
+ * Stop activity on all endpoints.
+ * Device controller for which EP activity is to be stopped.
+ *
+ * All the endpoints are stopped and any pending transfer requests if any on
+ * the endpoint are terminated.
+ */
+static void ast_udc_stop_activity(struct ast_udc_dev *udc)
+{
+ struct ast_udc_ep *ep;
+ int i;
+
+ for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+ ep->stopped = 1;
+ ast_udc_nuke(ep, -ESHUTDOWN);
+ }
+}
+
+static int ast_udc_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ u16 maxpacket = usb_endpoint_maxp(desc);
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_dev *udc = ep->udc;
+ u8 epnum = usb_endpoint_num(desc);
+ unsigned long flags;
+ u32 ep_conf = 0;
+ u8 dir_in;
+ u8 type;
+
+ if (!_ep || !ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT ||
+ maxpacket == 0 || maxpacket > ep->ep.maxpacket) {
+ EP_DBG(ep, "Failed, invalid EP enable param\n");
+ return -EINVAL;
+ }
+
+ if (!udc->driver) {
+ EP_DBG(ep, "bogus device state\n");
+ return -ESHUTDOWN;
+ }
+
+ EP_DBG(ep, "maxpacket:0x%x\n", maxpacket);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ ep->desc = desc;
+ ep->stopped = 0;
+ ep->ep.maxpacket = maxpacket;
+ ep->chunk_max = AST_EP_DMA_DESC_MAX_LEN;
+
+ if (maxpacket < AST_UDC_EPn_MAX_PACKET)
+ ep_conf = EP_SET_MAX_PKT(maxpacket);
+
+ ep_conf |= EP_SET_EP_NUM(epnum);
+
+ type = usb_endpoint_type(desc);
+ dir_in = usb_endpoint_dir_in(desc);
+ ep->dir_in = dir_in;
+ if (!ep->dir_in)
+ ep_conf |= EP_DIR_OUT;
+
+ EP_DBG(ep, "type %d, dir_in %d\n", type, dir_in);
+ switch (type) {
+ case USB_ENDPOINT_XFER_ISOC:
+ ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_ISO);
+ break;
+
+ case USB_ENDPOINT_XFER_BULK:
+ ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_BULK);
+ break;
+
+ case USB_ENDPOINT_XFER_INT:
+ ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_INT);
+ break;
+ }
+
+ ep->desc_mode = udc->desc_mode && ep->descs_dma && ep->dir_in;
+ if (ep->desc_mode) {
+ ast_ep_write(ep, EP_DMA_CTRL_RESET, AST_UDC_EP_DMA_CTRL);
+ ast_ep_write(ep, 0, AST_UDC_EP_DMA_STS);
+ ast_ep_write(ep, ep->descs_dma, AST_UDC_EP_DMA_BUFF);
+
+ /* Enable Long Descriptor Mode */
+ ast_ep_write(ep, EP_DMA_CTRL_IN_LONG_MODE | EP_DMA_DESC_MODE,
+ AST_UDC_EP_DMA_CTRL);
+
+ ep->descs_wptr = 0;
+
+ } else {
+ ast_ep_write(ep, EP_DMA_CTRL_RESET, AST_UDC_EP_DMA_CTRL);
+ ast_ep_write(ep, EP_DMA_SINGLE_STAGE, AST_UDC_EP_DMA_CTRL);
+ ast_ep_write(ep, 0, AST_UDC_EP_DMA_STS);
+ }
+
+ /* Cleanup data toggle just in case */
+ ast_udc_write(udc, EP_TOGGLE_SET_EPNUM(epnum), AST_VHUB_EP_DATA);
+
+ /* Enable EP */
+ ast_ep_write(ep, ep_conf | EP_ENABLE, AST_UDC_EP_CONFIG);
+
+ EP_DBG(ep, "ep_config: 0x%x\n", ast_ep_read(ep, AST_UDC_EP_CONFIG));
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int ast_udc_ep_disable(struct usb_ep *_ep)
+{
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_dev *udc = ep->udc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ ep->ep.desc = NULL;
+ ep->stopped = 1;
+
+ ast_udc_nuke(ep, -ESHUTDOWN);
+ ast_ep_write(ep, 0, AST_UDC_EP_CONFIG);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static struct usb_request *ast_udc_ep_alloc_request(struct usb_ep *_ep,
+ gfp_t gfp_flags)
+{
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_request *req;
+
+ req = kzalloc(sizeof(struct ast_udc_request), gfp_flags);
+ if (!req) {
+ EP_DBG(ep, "request allocation failed\n");
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&req->queue);
+
+ return &req->req;
+}
+
+static void ast_udc_ep_free_request(struct usb_ep *_ep,
+ struct usb_request *_req)
+{
+ struct ast_udc_request *req = to_ast_req(_req);
+
+ kfree(req);
+}
+
+static int ast_dma_descriptor_setup(struct ast_udc_ep *ep, u32 dma_buf,
+ u16 tx_len, struct ast_udc_request *req)
+{
+ struct ast_udc_dev *udc = ep->udc;
+ struct device *dev = &udc->pdev->dev;
+ u32 offset, chunk;
+ int count, last;
+
+ if (!ep->descs) {
+ dev_warn(dev, "%s: Empty DMA descs list failure\n",
+ ep->ep.name);
+ return -EINVAL;
+ }
+
+ chunk = tx_len;
+ offset = count = last = 0;
+
+ EP_DBG(ep, "req @%p, %s:%d, %s:0x%x, %s:0x%x\n", req,
+ "wptr", ep->descs_wptr, "dma_buf", dma_buf,
+ "tx_len", tx_len);
+
+ /* Create Descriptor Lists */
+ while (chunk >= 0 && !last && count < AST_UDC_DESCS_COUNT) {
+
+ ep->descs[ep->descs_wptr].des_0 = dma_buf + offset;
+
+ if (chunk <= ep->chunk_max) {
+ ep->descs[ep->descs_wptr].des_1 = chunk;
+ last = 1;
+ } else {
+ ep->descs[ep->descs_wptr].des_1 = ep->chunk_max;
+ chunk -= ep->chunk_max;
+ }
+
+ EP_DBG(ep, "descs[%d]: 0x%x 0x%x, last:%d\n",
+ ep->descs_wptr,
+ ep->descs[ep->descs_wptr].des_0,
+ ep->descs[ep->descs_wptr].des_1,
+ last);
+
+ if (count == 0)
+ req->saved_dma_wptr = ep->descs_wptr;
+
+ ep->descs_wptr++;
+ count++;
+
+ if (ep->descs_wptr >= AST_UDC_DESCS_COUNT)
+ ep->descs_wptr = 0;
+
+ offset = ep->chunk_max * count;
+ }
+
+ return 0;
+}
+
+static void ast_udc_epn_kick(struct ast_udc_ep *ep, struct ast_udc_request *req)
+{
+ u32 tx_len;
+ u32 last;
+
+ last = req->req.length - req->req.actual;
+ tx_len = last > ep->ep.maxpacket ? ep->ep.maxpacket : last;
+
+ EP_DBG(ep, "kick req @%p, len:%d, dir:%d\n",
+ req, tx_len, ep->dir_in);
+
+ ast_ep_write(ep, req->req.dma + req->req.actual, AST_UDC_EP_DMA_BUFF);
+
+ /* Start DMA */
+ ast_ep_write(ep, EP_DMA_SET_TX_SIZE(tx_len), AST_UDC_EP_DMA_STS);
+ ast_ep_write(ep, EP_DMA_SET_TX_SIZE(tx_len) | EP_DMA_SINGLE_KICK,
+ AST_UDC_EP_DMA_STS);
+}
+
+static void ast_udc_epn_kick_desc(struct ast_udc_ep *ep,
+ struct ast_udc_request *req)
+{
+ u32 descs_max_size;
+ u32 tx_len;
+ u32 last;
+
+ descs_max_size = AST_EP_DMA_DESC_MAX_LEN * AST_UDC_DESCS_COUNT;
+
+ last = req->req.length - req->req.actual;
+ tx_len = last > descs_max_size ? descs_max_size : last;
+
+ EP_DBG(ep, "kick req @%p, %s:%d, %s:0x%x, %s:0x%x (%d/%d), %s:0x%x\n",
+ req, "tx_len", tx_len, "dir_in", ep->dir_in,
+ "dma", req->req.dma + req->req.actual,
+ req->req.actual, req->req.length,
+ "descs_max_size", descs_max_size);
+
+ if (!ast_dma_descriptor_setup(ep, req->req.dma + req->req.actual,
+ tx_len, req))
+ req->actual_dma_length += tx_len;
+
+ /* make sure CPU done everything before triggering DMA */
+ mb();
+
+ ast_ep_write(ep, ep->descs_wptr, AST_UDC_EP_DMA_STS);
+
+ EP_DBG(ep, "descs_wptr:%d, dstat:0x%x, dctrl:0x%x\n",
+ ep->descs_wptr,
+ ast_ep_read(ep, AST_UDC_EP_DMA_STS),
+ ast_ep_read(ep, AST_UDC_EP_DMA_CTRL));
+}
+
+static void ast_udc_ep0_queue(struct ast_udc_ep *ep,
+ struct ast_udc_request *req)
+{
+ struct ast_udc_dev *udc = ep->udc;
+ u32 tx_len;
+ u32 last;
+
+ last = req->req.length - req->req.actual;
+ tx_len = last > ep->ep.maxpacket ? ep->ep.maxpacket : last;
+
+ ast_udc_write(udc, req->req.dma + req->req.actual,
+ AST_UDC_EP0_DATA_BUFF);
+
+ if (ep->dir_in) {
+ /* IN requests, send data */
+ SETUP_DBG(udc, "IN: %s:0x%x, %s:0x%x, %s:%d (%d/%d), %s:%d\n",
+ "buf", (u32)req->req.buf,
+ "dma", req->req.dma + req->req.actual,
+ "tx_len", tx_len,
+ req->req.actual, req->req.length,
+ "dir_in", ep->dir_in);
+
+ req->req.actual += tx_len;
+ ast_udc_write(udc, EP0_TX_LEN(tx_len), AST_UDC_EP0_CTRL);
+ ast_udc_write(udc, EP0_TX_LEN(tx_len) | EP0_TX_BUFF_RDY,
+ AST_UDC_EP0_CTRL);
+
+ } else {
+ /* OUT requests, receive data */
+ SETUP_DBG(udc, "OUT: %s:%x, %s:%x, %s:(%d/%d), %s:%d\n",
+ "buf", (u32)req->req.buf,
+ "dma", req->req.dma + req->req.actual,
+ "len", req->req.actual, req->req.length,
+ "dir_in", ep->dir_in);
+
+ if (!req->req.length) {
+ /* 0 len request, send tx as completion */
+ ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
+ ep->dir_in = 0x80;
+ } else
+ ast_udc_write(udc, EP0_RX_BUFF_RDY, AST_UDC_EP0_CTRL);
+ }
+}
+
+static int ast_udc_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t gfp_flags)
+{
+ struct ast_udc_request *req = to_ast_req(_req);
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_dev *udc = ep->udc;
+ struct device *dev = &udc->pdev->dev;
+ unsigned long flags;
+ int rc;
+
+ if (unlikely(!_req || !_req->complete || !_req->buf || !_ep)) {
+ dev_warn(dev, "Invalid EP request !\n");
+ return -EINVAL;
+ }
+
+ if (ep->stopped) {
+ dev_warn(dev, "%s is already stopped !\n", _ep->name);
+ return -ESHUTDOWN;
+ }
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ list_add_tail(&req->queue, &ep->queue);
+
+ req->req.actual = 0;
+ req->req.status = -EINPROGRESS;
+ req->actual_dma_length = 0;
+
+ rc = usb_gadget_map_request(&udc->gadget, &req->req, ep->dir_in);
+ if (rc) {
+ EP_DBG(ep, "Request mapping failure %d\n", rc);
+ dev_warn(dev, "Request mapping failure %d\n", rc);
+ return rc;
+ }
+
+ EP_DBG(ep, "enqueue req @%p\n", req);
+ EP_DBG(ep, "l=%d, dma:0x%x, zero:%d, is_in:%d\n",
+ _req->length, _req->dma, _req->zero, ep->dir_in);
+
+ /* EP0 request enqueue */
+ if (ep->ep.desc == NULL) {
+ if ((req->req.dma % 4) != 0) {
+ dev_warn(dev, "EP0 req dma alignment error\n");
+ return -ESHUTDOWN;
+ }
+
+ ast_udc_ep0_queue(ep, req);
+ goto end;
+ }
+
+ /* EPn request enqueue */
+ if (list_is_singular(&ep->queue)) {
+ if (ep->desc_mode)
+ ast_udc_epn_kick_desc(ep, req);
+ else
+ ast_udc_epn_kick(ep, req);
+ }
+
+end:
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int ast_udc_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_dev *udc = ep->udc;
+ struct ast_udc_request *req;
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /* make sure it's actually queued on this endpoint */
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (&req->req == _req) {
+ list_del_init(&req->queue);
+ ast_udc_done(ep, req, -ESHUTDOWN);
+ _req->status = -ECONNRESET;
+ break;
+ }
+ }
+
+ /* dequeue request not found */
+ if (&req->req != _req)
+ rc = -EINVAL;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return rc;
+}
+
+static int ast_udc_ep_set_halt(struct usb_ep *_ep, int value)
+{
+ struct ast_udc_ep *ep = to_ast_ep(_ep);
+ struct ast_udc_dev *udc = ep->udc;
+ unsigned long flags;
+ int epnum;
+ u32 ctrl;
+
+ EP_DBG(ep, "val:%d\n", value);
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ epnum = usb_endpoint_num(ep->desc);
+
+ /* EP0 */
+ if (epnum == 0) {
+ ctrl = ast_udc_read(udc, AST_UDC_EP0_CTRL);
+ if (value)
+ ctrl |= EP0_STALL;
+ else
+ ctrl &= ~EP0_STALL;
+
+ ast_udc_write(udc, ctrl, AST_UDC_EP0_CTRL);
+
+ } else {
+ /* EPn */
+ ctrl = ast_udc_read(udc, AST_UDC_EP_CONFIG);
+ if (value)
+ ctrl |= EP_SET_EP_STALL;
+ else
+ ctrl &= ~EP_SET_EP_STALL;
+
+ ast_ep_write(ep, ctrl, AST_UDC_EP_CONFIG);
+
+ /* only epn is stopped and waits for clear */
+ ep->stopped = value ? 1 : 0;
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static const struct usb_ep_ops ast_udc_ep_ops = {
+ .enable = ast_udc_ep_enable,
+ .disable = ast_udc_ep_disable,
+ .alloc_request = ast_udc_ep_alloc_request,
+ .free_request = ast_udc_ep_free_request,
+ .queue = ast_udc_ep_queue,
+ .dequeue = ast_udc_ep_dequeue,
+ .set_halt = ast_udc_ep_set_halt,
+ /* there's only imprecise fifo status reporting */
+};
+
+static void ast_udc_ep0_rx(struct ast_udc_dev *udc)
+{
+ ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
+ ast_udc_write(udc, EP0_RX_BUFF_RDY, AST_UDC_EP0_CTRL);
+}
+
+static void ast_udc_ep0_tx(struct ast_udc_dev *udc)
+{
+ ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
+ ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
+}
+
+static void ast_udc_ep0_out(struct ast_udc_dev *udc)
+{
+ struct device *dev = &udc->pdev->dev;
+ struct ast_udc_ep *ep = &udc->ep[0];
+ struct ast_udc_request *req;
+ u16 rx_len;
+ u8 *buf;
+
+ if (list_empty(&ep->queue))
+ return;
+
+ req = list_entry(ep->queue.next, struct ast_udc_request, queue);
+
+ buf = req->req.buf;
+ rx_len = EP0_GET_RX_LEN(ast_udc_read(udc, AST_UDC_EP0_CTRL));
+ req->req.actual += rx_len;
+
+ SETUP_DBG(udc, "req %p (%d/%d)\n", req,
+ req->req.actual, req->req.length);
+
+ if ((rx_len < ep->ep.maxpacket) ||
+ (req->req.actual == req->req.length)) {
+ ast_udc_ep0_tx(udc);
+ if (!ep->dir_in)
+ ast_udc_done(ep, req, 0);
+
+ } else {
+ if (rx_len > req->req.length) {
+ // Issue Fix
+ dev_warn(dev, "Something wrong (%d/%d)\n",
+ req->req.actual, req->req.length);
+ ast_udc_ep0_tx(udc);
+ ast_udc_done(ep, req, 0);
+ return;
+ }
+
+ ep->dir_in = 0;
+
+ /* More works */
+ ast_udc_ep0_queue(ep, req);
+ }
+}
+
+static void ast_udc_ep0_in(struct ast_udc_dev *udc)
+{
+ struct ast_udc_ep *ep = &udc->ep[0];
+ struct ast_udc_request *req;
+
+ if (list_empty(&ep->queue)) {
+ if (udc->is_control_tx) {
+ ast_udc_ep0_rx(udc);
+ udc->is_control_tx = 0;
+ }
+
+ return;
+ }
+
+ req = list_entry(ep->queue.next, struct ast_udc_request, queue);
+
+ SETUP_DBG(udc, "req %p (%d/%d)\n", req,
+ req->req.actual, req->req.length);
+
+ if (req->req.length == req->req.actual) {
+ if (req->req.length)
+ ast_udc_ep0_rx(udc);
+
+ if (ep->dir_in)
+ ast_udc_done(ep, req, 0);
+
+ } else {
+ /* More works */
+ ast_udc_ep0_queue(ep, req);
+ }
+}
+
+static void ast_udc_epn_handle(struct ast_udc_dev *udc, u16 ep_num)
+{
+ struct ast_udc_ep *ep = &udc->ep[ep_num];
+ struct ast_udc_request *req;
+ u16 len = 0;
+
+ if (list_empty(&ep->queue))
+ return;
+
+ req = list_first_entry(&ep->queue, struct ast_udc_request, queue);
+
+ len = EP_DMA_GET_TX_SIZE(ast_ep_read(ep, AST_UDC_EP_DMA_STS));
+ req->req.actual += len;
+
+ EP_DBG(ep, "req @%p, length:(%d/%d), %s:0x%x\n", req,
+ req->req.actual, req->req.length, "len", len);
+
+ /* Done this request */
+ if (req->req.length == req->req.actual) {
+ ast_udc_done(ep, req, 0);
+ req = list_first_entry_or_null(&ep->queue,
+ struct ast_udc_request,
+ queue);
+
+ } else {
+ /* Check for short packet */
+ if (len < ep->ep.maxpacket) {
+ ast_udc_done(ep, req, 0);
+ req = list_first_entry_or_null(&ep->queue,
+ struct ast_udc_request,
+ queue);
+ }
+ }
+
+ /* More requests */
+ if (req)
+ ast_udc_epn_kick(ep, req);
+}
+
+static void ast_udc_epn_handle_desc(struct ast_udc_dev *udc, u16 ep_num)
+{
+ struct ast_udc_ep *ep = &udc->ep[ep_num];
+ struct device *dev = &udc->pdev->dev;
+ struct ast_udc_request *req;
+ u32 proc_sts, wr_ptr, rd_ptr;
+ u32 len_in_desc, ctrl;
+ u16 total_len = 0;
+ u16 len;
+ int i;
+
+ if (list_empty(&ep->queue)) {
+ dev_warn(dev, "%s reqest queue empty !\n", ep->ep.name);
+ return;
+ }
+
+ req = list_first_entry(&ep->queue, struct ast_udc_request, queue);
+
+ ctrl = ast_ep_read(ep, AST_UDC_EP_DMA_CTRL);
+ proc_sts = EP_DMA_CTRL_GET_PROC_STS(ctrl);
+
+ /* Check processing status is idle */
+ if (proc_sts != EP_DMA_CTRL_STS_RX_IDLE &&
+ proc_sts != EP_DMA_CTRL_STS_TX_IDLE) {
+ dev_warn(dev, "EP DMA CTRL: 0x%x, PS:0x%x\n",
+ ast_ep_read(ep, AST_UDC_EP_DMA_CTRL),
+ proc_sts);
+ return;
+ }
+
+ ctrl = ast_ep_read(ep, AST_UDC_EP_DMA_STS);
+ rd_ptr = EP_DMA_GET_RPTR(ctrl);
+ wr_ptr = EP_DMA_GET_WPTR(ctrl);
+
+ if (rd_ptr != wr_ptr) {
+ dev_warn(dev, "desc list is not empty ! %s:%d, %s:%d\n",
+ "rptr", rd_ptr, "wptr", wr_ptr);
+ return;
+ }
+
+ EP_DBG(ep, "rd_ptr:%d, wr_ptr:%d\n", rd_ptr, wr_ptr);
+ i = req->saved_dma_wptr;
+
+ do {
+ len_in_desc = EP_DESC1_IN_LEN(ep->descs[i].des_1);
+ EP_DBG(ep, "desc[%d] len: %d\n", i, len_in_desc);
+ total_len += len_in_desc;
+ i++;
+ if (i >= AST_UDC_DESCS_COUNT)
+ i = 0;
+
+ } while (i != wr_ptr);
+
+ req->req.actual += total_len;
+
+ EP_DBG(ep, "req @%p, length:(%d/%d), %s:0x%x\n", req,
+ req->req.actual, req->req.length, "len", total_len);
+
+ /* Done this request */
+ if (req->req.length == req->req.actual) {
+ ast_udc_done(ep, req, 0);
+ req = list_first_entry_or_null(&ep->queue,
+ struct ast_udc_request,
+ queue);
+
+ } else {
+ /* Check for short packet */
+ if (len < ep->ep.maxpacket) {
+ ast_udc_done(ep, req, 0);
+ req = list_first_entry_or_null(&ep->queue,
+ struct ast_udc_request,
+ queue);
+ }
+ }
+
+ /* More requests & dma descs not setup yet */
+ if (req && (req->actual_dma_length == req->req.actual)) {
+ EP_DBG(ep, "More requests\n");
+ ast_udc_epn_kick_desc(ep, req);
+ }
+}
+
+static void ast_udc_ep0_data_tx(struct ast_udc_dev *udc, u8 *tx_data, u32 len)
+{
+ if (len) {
+ memcpy(udc->ep0_buf, tx_data, len);
+
+ ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
+ ast_udc_write(udc, EP0_TX_LEN(len), AST_UDC_EP0_CTRL);
+ ast_udc_write(udc, EP0_TX_LEN(len) | EP0_TX_BUFF_RDY,
+ AST_UDC_EP0_CTRL);
+ udc->is_control_tx = 1;
+
+ } else
+ ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
+}
+
+static void ast_udc_getstatus(struct ast_udc_dev *udc)
+{
+ struct ast_udc_ep *ep;
+ u16 status = 0;
+ int epnum;
+
+ switch (udc->creq->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ /* Get device status */
+ status = 1 << USB_DEVICE_SELF_POWERED;
+ break;
+ case USB_RECIP_INTERFACE:
+ break;
+ case USB_RECIP_ENDPOINT:
+ epnum = udc->creq->wIndex & USB_ENDPOINT_NUMBER_MASK;
+ status = udc->ep[epnum].stopped;
+ break;
+ default:
+ goto stall;
+ }
+
+ ep = &udc->ep[epnum];
+ EP_DBG(ep, "status: 0x%x\n", status);
+ ast_udc_ep0_data_tx(udc, (u8 *)&status, sizeof(status));
+
+ return;
+
+stall:
+ EP_DBG(ep, "Can't respond request\n");
+ ast_udc_write(udc, ast_udc_read(udc, AST_UDC_EP0_CTRL) | EP0_STALL,
+ AST_UDC_EP0_CTRL);
+}
+
+static void ast_udc_ep0_handle_setup(struct ast_udc_dev *udc)
+{
+ struct ast_udc_ep *ep = &udc->ep[0];
+ struct ast_udc_request *req;
+ struct usb_ctrlrequest crq;
+ int req_num = 0;
+ u16 ep_num = 0;
+ int rc;
+
+ memcpy_fromio(&crq, udc->creq, sizeof(crq));
+
+ SETUP_DBG(udc, "SETEUP packet: %02x/%02x/%04x/%04x/%04x\n",
+ crq.bRequestType, crq.bRequest, le16_to_cpu(crq.wValue),
+ le16_to_cpu(crq.wIndex), le16_to_cpu(crq.wLength));
+
+ /*
+ * Cleanup ep0 request(s) in queue because
+ * there is a new control setup comes.
+ */
+ list_for_each_entry(req, &udc->ep[0].queue, queue) {
+ req_num++;
+ EP_DBG(ep, "there is req %p in ep0 queue !\n", req);
+ }
+
+ if (req_num)
+ ast_udc_nuke(&udc->ep[0], -ETIMEDOUT);
+
+ udc->ep[0].dir_in = crq.bRequestType & USB_DIR_IN;
+
+ if ((crq.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+ switch (crq.bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ if (ast_udc_read(udc, AST_UDC_STS) & UDC_STS_HIGHSPEED)
+ udc->gadget.speed = USB_SPEED_HIGH;
+ else
+ udc->gadget.speed = USB_SPEED_FULL;
+
+ SETUP_DBG(udc, "set addr: 0x%x\n", crq.wValue);
+ ast_udc_write(udc, crq.wValue, AST_UDC_CONFIG);
+ goto req_complete;
+
+ case USB_REQ_CLEAR_FEATURE:
+ ep_num = crq.wIndex & USB_ENDPOINT_NUMBER_MASK;
+ SETUP_DBG(udc, "ep%d: CLEAR FEATURE\n", ep_num);
+ goto req_driver;
+
+ case USB_REQ_SET_FEATURE:
+ ep_num = crq.wIndex & USB_ENDPOINT_NUMBER_MASK;
+ SETUP_DBG(udc, "ep%d: SET FEATURE\n", ep_num);
+ goto req_driver;
+
+ case USB_REQ_GET_STATUS:
+ ast_udc_getstatus(udc);
+ return;
+
+ default:
+ goto req_driver;
+ }
+
+ }
+
+req_driver:
+ if (udc->driver) {
+ SETUP_DBG(udc, "Forwarding %s to gadget...\n",
+ udc->gadget.name);
+
+ spin_unlock(&udc->lock);
+ rc = udc->driver->setup(&udc->gadget, &crq);
+ spin_lock(&udc->lock);
+
+ } else
+ SETUP_DBG(udc, "No gadget for request !\n");
+
+ if (rc >= 0)
+ return;
+
+ /* Stall if gadget failed */
+ SETUP_DBG(udc, "Stalling, rc:0x%x\n", rc);
+ ast_udc_write(udc, ast_udc_read(udc, AST_UDC_EP0_CTRL) | EP0_STALL,
+ AST_UDC_EP0_CTRL);
+ return;
+
+req_complete:
+ SETUP_DBG(udc, "ep%d: Sending IN status without data\n", ep_num);
+ ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
+}
+
+static irqreturn_t ast_udc_isr(int irq, void *data)
+{
+ struct ast_udc_dev *udc = (struct ast_udc_dev *)data;
+ struct ast_udc_ep *ep;
+ u32 isr, ep_isr;
+ int i;
+
+ spin_lock(&udc->lock);
+
+ isr = ast_udc_read(udc, AST_UDC_ISR);
+ if (!isr)
+ goto done;
+
+ /* Ack interrupts */
+ ast_udc_write(udc, isr, AST_UDC_ISR);
+
+ if (isr & UDC_IRQ_BUS_RESET) {
+ ISR_DBG(udc, "UDC_IRQ_BUS_RESET\n");
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+
+ ep = &udc->ep[1];
+ EP_DBG(ep, "dctrl:0x%x\n",
+ ast_ep_read(ep, AST_UDC_EP_DMA_CTRL));
+
+ if (udc->driver && udc->driver->reset) {
+ spin_unlock(&udc->lock);
+ udc->driver->reset(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+ }
+
+ if (isr & UDC_IRQ_BUS_SUSPEND) {
+ ISR_DBG(udc, "UDC_IRQ_BUS_SUSPEND\n");
+ udc->suspended_from = udc->gadget.state;
+ usb_gadget_set_state(&udc->gadget, USB_STATE_SUSPENDED);
+
+ if (udc->driver && udc->driver->suspend) {
+ spin_unlock(&udc->lock);
+ udc->driver->suspend(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+ }
+
+ if (isr & UDC_IRQ_BUS_RESUME) {
+ ISR_DBG(udc, "UDC_IRQ_BUS_RESUME\n");
+ usb_gadget_set_state(&udc->gadget, udc->suspended_from);
+
+ if (udc->driver && udc->driver->resume) {
+ spin_unlock(&udc->lock);
+ udc->driver->resume(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+ }
+
+ if (isr & UDC_IRQ_EP0_IN_ACK_STALL) {
+ ISR_DBG(udc, "UDC_IRQ_EP0_IN_ACK_STALL\n");
+ ast_udc_ep0_in(udc);
+ }
+
+ if (isr & UDC_IRQ_EP0_OUT_ACK_STALL) {
+ ISR_DBG(udc, "UDC_IRQ_EP0_OUT_ACK_STALL\n");
+ ast_udc_ep0_out(udc);
+ }
+
+ if (isr & UDC_IRQ_EP0_SETUP) {
+ ISR_DBG(udc, "UDC_IRQ_EP0_SETUP\n");
+ ast_udc_ep0_handle_setup(udc);
+ }
+
+ if (isr & UDC_IRQ_EP_POOL_ACK_STALL) {
+ ISR_DBG(udc, "UDC_IRQ_EP_POOL_ACK_STALL\n");
+ ep_isr = ast_udc_read(udc, AST_UDC_EP_ACK_ISR);
+
+ /* Ack EP interrupts */
+ ast_udc_write(udc, ep_isr, AST_UDC_EP_ACK_ISR);
+
+ /* Handle each EP */
+ for (i = 0; i < AST_UDC_NUM_ENDPOINTS - 1; i++) {
+ if (ep_isr & (0x1 << i)) {
+ ep = &udc->ep[i + 1];
+ if (ep->desc_mode)
+ ast_udc_epn_handle_desc(udc, i + 1);
+ else
+ ast_udc_epn_handle(udc, i + 1);
+ }
+ }
+ }
+
+done:
+ spin_unlock(&udc->lock);
+ return IRQ_HANDLED;
+}
+
+static int ast_udc_gadget_getframe(struct usb_gadget *gadget)
+{
+ struct ast_udc_dev *udc = to_ast_dev(gadget);
+
+ return (ast_udc_read(udc, AST_UDC_STS) >> 16) & 0x7ff;
+}
+
+static void ast_udc_wake_work(struct work_struct *work)
+{
+ struct ast_udc_dev *udc = container_of(work, struct ast_udc_dev,
+ wake_work);
+ unsigned long flags;
+ u32 ctrl;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ UDC_DBG(udc, "Wakeup Host !\n");
+ ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL);
+ ast_udc_write(udc, ctrl | USB_REMOTE_WAKEUP_EN, AST_UDC_FUNC_CTRL);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static void ast_udc_wakeup_all(struct ast_udc_dev *udc)
+{
+ /*
+ * A device is trying to wake the world, because this
+ * can recurse into the device, we break the call chain
+ * using a work queue
+ */
+ schedule_work(&udc->wake_work);
+}
+
+static int ast_udc_wakeup(struct usb_gadget *gadget)
+{
+ struct ast_udc_dev *udc = to_ast_dev(gadget);
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!udc->wakeup_en) {
+ UDC_DBG(udc, "Remote Wakeup is disabled\n");
+ rc = -EINVAL;
+ goto err;
+ }
+
+ UDC_DBG(udc, "Device initiated wakeup\n");
+ ast_udc_wakeup_all(udc);
+
+err:
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return rc;
+}
+
+/*
+ * Activate/Deactivate link with host
+ */
+static int ast_udc_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct ast_udc_dev *udc = to_ast_dev(gadget);
+ unsigned long flags;
+ u32 ctrl;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ UDC_DBG(udc, "is_on: %d\n", is_on);
+ if (is_on)
+ ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) | USB_UPSTREAM_EN;
+ else
+ ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
+
+ ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int ast_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct ast_udc_dev *udc = to_ast_dev(gadget);
+ struct ast_udc_ep *ep;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ UDC_DBG(udc, "\n");
+ udc->driver = driver;
+ udc->gadget.dev.of_node = udc->pdev->dev.of_node;
+
+ for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+ ep->stopped = 0;
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int ast_udc_stop(struct usb_gadget *gadget)
+{
+ struct ast_udc_dev *udc = to_ast_dev(gadget);
+ unsigned long flags;
+ u32 ctrl;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ UDC_DBG(udc, "\n");
+ ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
+ ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
+
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->driver = NULL;
+
+ ast_udc_stop_activity(udc);
+ usb_gadget_set_state(&udc->gadget, USB_STATE_NOTATTACHED);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static const struct usb_gadget_ops ast_udc_ops = {
+ .get_frame = ast_udc_gadget_getframe,
+ .wakeup = ast_udc_wakeup,
+ .pullup = ast_udc_pullup,
+ .udc_start = ast_udc_start,
+ .udc_stop = ast_udc_stop,
+};
+
+/*
+ * Support 1 Control Endpoint.
+ * Support multiple programmable endpoints that can be configured to
+ * Bulk IN/OUT, Interrupt IN/OUT, and Isochronous IN/OUT type endpoint.
+ */
+static void ast_udc_init_ep(struct ast_udc_dev *udc)
+{
+ struct ast_udc_ep *ep;
+ int i;
+
+ for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+ ep->ep.name = ast_ep_name[i];
+ if (i == 0) {
+ ep->ep.caps.type_control = true;
+ } else {
+ ep->ep.caps.type_iso = true;
+ ep->ep.caps.type_bulk = true;
+ ep->ep.caps.type_int = true;
+ }
+ ep->ep.caps.dir_in = true;
+ ep->ep.caps.dir_out = true;
+
+ ep->ep.ops = &ast_udc_ep_ops;
+ ep->udc = udc;
+
+ INIT_LIST_HEAD(&ep->queue);
+
+ if (i == 0) {
+ usb_ep_set_maxpacket_limit(&ep->ep,
+ AST_UDC_EP0_MAX_PACKET);
+ continue;
+ }
+
+ ep->ep_reg = udc->reg + AST_UDC_EP_BASE +
+ (AST_UDC_EP_OFFSET * (i - 1));
+
+ ep->epn_buf = udc->ep0_buf + (i * AST_UDC_EP_DMA_SIZE);
+ ep->epn_buf_dma = udc->ep0_buf_dma + (i * AST_UDC_EP_DMA_SIZE);
+ usb_ep_set_maxpacket_limit(&ep->ep, AST_UDC_EPn_MAX_PACKET);
+
+ ep->descs = ep->epn_buf + AST_UDC_EPn_MAX_PACKET;
+ ep->descs_dma = ep->epn_buf_dma + AST_UDC_EPn_MAX_PACKET;
+ ep->descs_wptr = 0;
+
+ list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+ }
+}
+
+static void ast_udc_init_dev(struct ast_udc_dev *udc)
+{
+ INIT_WORK(&udc->wake_work, ast_udc_wake_work);
+}
+
+static void ast_udc_init_hw(struct ast_udc_dev *udc)
+{
+ u32 ctrl;
+
+ /* Enable PHY */
+ ctrl = USB_PHY_CLK_EN | USB_PHY_RESET_DIS;
+ ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
+
+ udelay(1);
+ ast_udc_write(udc, 0, AST_UDC_DEV_RESET);
+
+ /* Set descriptor ring size */
+ if (AST_UDC_DESCS_COUNT == 256) {
+ ctrl |= USB_EP_LONG_DESC;
+ ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
+ }
+
+ /* Mask & ack all interrupts before installing the handler */
+ ast_udc_write(udc, 0, AST_UDC_IER);
+ ast_udc_write(udc, UDC_IRQ_ACK_ALL, AST_UDC_ISR);
+
+ /* Enable some interrupts */
+ ctrl = UDC_IRQ_EP_POOL_ACK_STALL | UDC_IRQ_BUS_RESUME |
+ UDC_IRQ_BUS_SUSPEND | UDC_IRQ_BUS_RESET |
+ UDC_IRQ_EP0_IN_ACK_STALL | UDC_IRQ_EP0_OUT_ACK_STALL |
+ UDC_IRQ_EP0_SETUP;
+ ast_udc_write(udc, ctrl, AST_UDC_IER);
+
+ /* Cleanup and enable ep ACK interrupts */
+ ast_udc_write(udc, UDC_IRQ_EP_ACK_ALL, AST_UDC_EP_ACK_IER);
+ ast_udc_write(udc, UDC_IRQ_EP_ACK_ALL, AST_UDC_EP_ACK_ISR);
+
+ ast_udc_write(udc, 0, AST_UDC_EP0_CTRL);
+}
+
+static int ast_udc_remove(struct platform_device *pdev)
+{
+ struct ast_udc_dev *udc = platform_get_drvdata(pdev);
+ unsigned long flags;
+ u32 ctrl;
+
+ usb_del_gadget_udc(&udc->gadget);
+ if (udc->driver)
+ return -EBUSY;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /* Disable upstream port connection */
+ ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
+ ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
+
+ clk_disable_unprepare(udc->clk);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ if (udc->ep0_buf)
+ dma_free_coherent(&pdev->dev,
+ AST_UDC_EP_DMA_SIZE * AST_UDC_NUM_ENDPOINTS,
+ udc->ep0_buf,
+ udc->ep0_buf_dma);
+
+ udc->ep0_buf = NULL;
+
+ return 0;
+}
+
+static int ast_udc_probe(struct platform_device *pdev)
+{
+ enum usb_device_speed max_speed;
+ struct device *dev = &pdev->dev;
+ struct ast_udc_dev *udc;
+ struct resource *res;
+ int rc;
+
+ udc = devm_kzalloc(&pdev->dev, sizeof(struct ast_udc_dev), GFP_KERNEL);
+ if (!udc)
+ return -ENOMEM;
+
+ udc->gadget.dev.parent = dev;
+ udc->pdev = pdev;
+ spin_lock_init(&udc->lock);
+
+ udc->gadget.ops = &ast_udc_ops;
+ udc->gadget.ep0 = &udc->ep[0].ep;
+ udc->gadget.name = "aspeed-udc";
+ udc->gadget.dev.init_name = "gadget";
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ udc->reg = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(udc->reg)) {
+ dev_err(&pdev->dev, "Failed to map resources\n");
+ return PTR_ERR(udc->reg);
+ }
+
+ platform_set_drvdata(pdev, udc);
+
+ udc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(udc->clk)) {
+ rc = PTR_ERR(udc->clk);
+ goto err;
+ }
+ rc = clk_prepare_enable(udc->clk);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed to enable clock (0x%x)\n", rc);
+ goto err;
+ }
+
+ /* Check if we need to limit the HW to USB1 */
+ max_speed = usb_get_maximum_speed(&pdev->dev);
+ if (max_speed != USB_SPEED_UNKNOWN && max_speed < USB_SPEED_HIGH)
+ udc->force_usb1 = true;
+
+ /*
+ * Allocate DMA buffers for all EPs in one chunk
+ */
+ udc->ep0_buf = dma_alloc_coherent(&pdev->dev,
+ AST_UDC_EP_DMA_SIZE *
+ AST_UDC_NUM_ENDPOINTS,
+ &udc->ep0_buf_dma, GFP_KERNEL);
+
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->gadget.max_speed = USB_SPEED_HIGH;
+ udc->creq = udc->reg + AST_UDC_SETUP0;
+
+ /*
+ * Support single stage mode or 32/256 stages descriptor mode.
+ * Set default as Descriptor Mode.
+ */
+ udc->desc_mode = AST_UDC_DESC_MODE;
+
+ dev_info(&pdev->dev, "DMA %s\n", udc->desc_mode ?
+ "descriptor mode" : "single mode");
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+ INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
+
+ /* Initialized udc ep */
+ ast_udc_init_ep(udc);
+
+ /* Initialized udc device */
+ ast_udc_init_dev(udc);
+
+ /* Initialized udc hardware */
+ ast_udc_init_hw(udc);
+
+ /* Find interrupt and install handler */
+ udc->irq = platform_get_irq(pdev, 0);
+ if (udc->irq < 0) {
+ dev_err(&pdev->dev, "Failed to get interrupt\n");
+ rc = udc->irq;
+ goto err;
+ }
+
+ rc = devm_request_irq(&pdev->dev, udc->irq, ast_udc_isr, 0,
+ KBUILD_MODNAME, udc);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed to request interrupt\n");
+ goto err;
+ }
+
+ rc = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed to add gadget udc\n");
+ goto err;
+ }
+
+ dev_info(&pdev->dev, "Initialized udc in USB%s mode\n",
+ udc->force_usb1 ? "1" : "2");
+
+ return 0;
+
+err:
+ dev_err(&pdev->dev, "Failed to udc probe, rc:0x%x\n", rc);
+ ast_udc_remove(pdev);
+
+ return rc;
+}
+
+static const struct of_device_id ast_udc_of_dt_ids[] = {
+ { .compatible = "aspeed,ast2600-udc", },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, ast_udc_of_dt_ids);
+
+static struct platform_driver ast_udc_driver = {
+ .probe = ast_udc_probe,
+ .remove = ast_udc_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = ast_udc_of_dt_ids,
+ },
+};
+
+module_platform_driver(ast_udc_driver);
+
+MODULE_DESCRIPTION("ASPEED UDC driver");
+MODULE_AUTHOR("Neal Liu <neal_liu@aspeedtech.com>");
+MODULE_LICENSE("GPL");
--
2.25.1