RE: [PATCH v5 1/3] usb: gadget: add Aspeed ast2600 udc driver
From: Neal Liu
Date: Sun May 29 2022 - 21:28:47 EST
Gentle ping on this path, thanks.
> -----Original Message-----
> From: Neal Liu <neal_liu@xxxxxxxxxxxxxx>
> Sent: Monday, May 23, 2022 11:02 AM
> To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>; Rob Herring
> <robh+dt@xxxxxxxxxx>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@xxxxxxxxxx>; Joel Stanley <joel@xxxxxxxxx>; Andrew
> Jeffery <andrew@xxxxxxxx>; Felipe Balbi <balbi@xxxxxxxxxx>; Sumit Semwal
> <sumit.semwal@xxxxxxxxxx>; Christian König <christian.koenig@xxxxxxx>;
> Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>; Li Yang <leoyang.li@xxxxxxx>
> Cc: Neal Liu <neal_liu@xxxxxxxxxxxxxx>; linux-aspeed@xxxxxxxxxxxxxxxx;
> linux-usb@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-media@xxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
> linaro-mm-sig@xxxxxxxxxxxxxxxx
> Subject: [PATCH v5 1/3] usb: gadget: add Aspeed ast2600 udc driver
>
> 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@xxxxxxxxxxxxxx>
> ---
> MAINTAINERS | 7 +
> drivers/usb/gadget/udc/Kconfig | 13 +
> drivers/usb/gadget/udc/Makefile | 1 +
> drivers/usb/gadget/udc/aspeed_udc.c | 1596
> +++++++++++++++++++++++++++
> 4 files changed, 1617 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@xxxxxxxxxxxxxx>
> +L: linux-aspeed@xxxxxxxxxxxxxxxx (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@xxxxxxxxx>
> L: acpi4asus-user@xxxxxxxxxxxxxxxxxxxxx
> 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..1fc15228ff15
> --- /dev/null
> +++ b/drivers/usb/gadget/udc/aspeed_udc.c
> @@ -0,0 +1,1596 @@
> +// 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)
> +
> +/* Main config reg */
> +#define UDC_CFG_SET_ADDR(x) ((x) & 0x3f)
> +#define UDC_CFG_ADDR_MASK (0x3f)
> +
> +/* 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;
> + void __iomem *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;
> +
> + 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 = 0x1;
> + } 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);
> + goto end;
> + }
> +
> + 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 rc;
> +}
> +
> +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;
> +
> + if (list_empty(&ep->queue))
> + return;
> +
> + req = list_entry(ep->queue.next, struct ast_udc_request, queue);
> +
> + 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;
> + 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 (total_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 usb_ctrlrequest crq;
> + struct ast_udc_ep *ep;
> + u16 status = 0;
> + u16 epnum = 0;
> +
> + memcpy_fromio(&crq, udc->creq, sizeof(crq));
> +
> + switch (crq.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 = crq.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;
> + int rc = 0;
> + u32 reg;
> +
> + 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);
> + reg = ast_udc_read(udc, AST_UDC_CONFIG);
> + reg &= ~UDC_CFG_ADDR_MASK;
> + reg |= UDC_CFG_SET_ADDR(crq.wValue);
> + ast_udc_write(udc, reg, AST_UDC_CONFIG);
> + goto req_complete;
> +
> + case USB_REQ_CLEAR_FEATURE:
> + SETUP_DBG(udc, "ep0: CLEAR FEATURE\n");
> + goto req_driver;
> +
> + case USB_REQ_SET_FEATURE:
> + SETUP_DBG(udc, "ep0: SET FEATURE\n");
> + 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, "ep0: Sending IN status without data\n");
> + 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@xxxxxxxxxxxxxx>"); MODULE_LICENSE("GPL");
> --
> 2.25.1