Add device tree binding documentation for the Aspeed USB2.0 Device Controller.

Signed-off-by: Neal Liu neal_liu@aspeedtech.com --- .../bindings/usb/aspeed,ast2600-udc.yaml | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/aspeed,ast2600-udc.yaml

diff --git a/Documentation/devicetree/bindings/usb/aspeed,ast2600-udc.yaml b/Documentation/devicetree/bindings/usb/aspeed,ast2600-udc.yaml new file mode 100644 index 000000000000..2e91d5179359 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/aspeed,ast2600-udc.yaml @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (c) 2020 Facebook Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/usb/aspeed,ast2600-udc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ASPEED USB 2.0 Device Controller + +maintainers: + - Neal Liu neal_liu@aspeedtech.com + +description: |+ + The ASPEED USB 2.0 Device Controller implements 1 control endpoint and + 4 generic endpoints for AST260x. + + Supports independent DMA channel for each generic endpoint. + Supports 32/256 stages descriptor mode for all generic endpoints. + +properties: + compatible: + enum: + - aspeed,ast2600-udc + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + interrupts: + maxItems: 1 + +required: + - compatible + - reg + - clocks + - interrupts + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/aspeed-clock.h> + usb: usb@1e6a2000 { + compatible = "aspeed,ast2600-udc"; + reg = <0x1e6a2000 0x300>; + interrupts = <9>; + clocks = <&syscon ASPEED_CLK_GATE_USBPORT2CLK>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usb2bd_default>; + };

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 Reported-by: kernel test robot lkp@intel.com

--- MAINTAINERS | 7 + drivers/usb/gadget/udc/Kconfig | 13 + drivers/usb/gadget/udc/Makefile | 1 + drivers/usb/gadget/udc/aspeed_udc.c | 1601 +++++++++++++++++++++++++++ 4 files changed, 1622 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..271015142210 --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed_udc.c @@ -0,0 +1,1601 @@ +// 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; + + /* 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 = 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; + 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 usb_ctrlrequest crq; + struct ast_udc_ep *ep; + u16 status = 0; + u16 epnum; + + 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; + 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@aspeedtech.com"); +MODULE_LICENSE("GPL");