--- /dev/null
+/*
+ * ci13xxx_udc.c - MIPS USB IP core family device controller
+ *
+ * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
+ *
+ * Author: David Lopo
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Description: MIPS USB IP core family device controller
+ * Currently it only supports IP part number CI13412
+ *
+ * This driver is composed of several blocks:
+ * - HW: hardware interface
+ * - DBG: debug facilities (optional)
+ * - UTIL: utilities
+ * - ISR: interrupts handling
+ * - ENDPT: endpoint operations (Gadget API)
+ * - GADGET: gadget operations (Gadget API)
+ * - BUS: bus glue code, bus abstraction layer
+ * - PCI: PCI core interface and PCI resources (interrupts, memory...)
+ *
+ * Compile Options
+ * - CONFIG_USB_GADGET_DEBUG_FILES: enable debug facilities
+ * - STALL_IN: non-empty bulk-in pipes cannot be halted
+ * if defined mass storage compliance succeeds but with warnings
+ * => case 4: Hi > Dn
+ * => case 5: Hi > Di
+ * => case 8: Hi <> Do
+ * if undefined usbtest 13 fails
+ * - TRACE: enable function tracing (depends on DEBUG)
+ *
+ * Main Features
+ * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
+ * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
+ * - Normal & LPM support
+ *
+ * USBTEST Report
+ * - OK: 0-12, 13 (STALL_IN defined) & 14
+ * - Not Supported: 15 & 16 (ISO)
+ *
+ * TODO List
+ * - OTG
+ * - Isochronous & Interrupt Traffic
+ * - Handle requests which spawns into several TDs
+ * - GET_STATUS(device) - always reports 0
+ * - Gadget API (majority of optional features)
+ * - Suspend & Remote Wakeup
+ */
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include "ci13xxx_udc.h"
+
+
+/******************************************************************************
+ * DEFINE
+ *****************************************************************************/
+/* ctrl register bank access */
+static DEFINE_SPINLOCK(udc_lock);
+
+/* driver name */
+#define UDC_DRIVER_NAME "ci13xxx_udc"
+
+/* control endpoint description */
+static const struct usb_endpoint_descriptor
+ctrl_endpt_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
+};
+
+/* UDC descriptor */
+static struct ci13xxx *_udc;
+
+/* Interrupt statistics */
+#define ISR_MASK 0x1F
+static struct {
+ u32 test;
+ u32 ui;
+ u32 uei;
+ u32 pci;
+ u32 uri;
+ u32 sli;
+ u32 none;
+ struct {
+ u32 cnt;
+ u32 buf[ISR_MASK+1];
+ u32 idx;
+ } hndl;
+} isr_statistics;
+
+/**
+ * ffs_nr: find first (least significant) bit set
+ * @x: the word to search
+ *
+ * This function returns bit number (instead of position)
+ */
+static int ffs_nr(u32 x)
+{
+ int n = ffs(x);
+
+ return n ? n-1 : 32;
+}
+
+/******************************************************************************
+ * HW block
+ *****************************************************************************/
+/* register bank descriptor */
+static struct {
+ unsigned lpm; /* is LPM? */
+ void __iomem *abs; /* bus map offset */
+ void __iomem *cap; /* bus map offset + CAP offset + CAP data */
+ size_t size; /* bank size */
+} hw_bank;
+
+/* UDC register map */
+#define ABS_CAPLENGTH (0x100UL)
+#define ABS_HCCPARAMS (0x108UL)
+#define ABS_DCCPARAMS (0x124UL)
+#define ABS_TESTMODE (hw_bank.lpm ? 0x0FCUL : 0x138UL)
+/* offset to CAPLENTGH (addr + data) */
+#define CAP_USBCMD (0x000UL)
+#define CAP_USBSTS (0x004UL)
+#define CAP_USBINTR (0x008UL)
+#define CAP_DEVICEADDR (0x014UL)
+#define CAP_ENDPTLISTADDR (0x018UL)
+#define CAP_PORTSC (0x044UL)
+#define CAP_DEVLC (0x0B4UL)
+#define CAP_USBMODE (hw_bank.lpm ? 0x0C8UL : 0x068UL)
+#define CAP_ENDPTSETUPSTAT (hw_bank.lpm ? 0x0D8UL : 0x06CUL)
+#define CAP_ENDPTPRIME (hw_bank.lpm ? 0x0DCUL : 0x070UL)
+#define CAP_ENDPTFLUSH (hw_bank.lpm ? 0x0E0UL : 0x074UL)
+#define CAP_ENDPTSTAT (hw_bank.lpm ? 0x0E4UL : 0x078UL)
+#define CAP_ENDPTCOMPLETE (hw_bank.lpm ? 0x0E8UL : 0x07CUL)
+#define CAP_ENDPTCTRL (hw_bank.lpm ? 0x0ECUL : 0x080UL)
+#define CAP_LAST (hw_bank.lpm ? 0x12CUL : 0x0C0UL)
+
+/* maximum number of enpoints: valid only after hw_device_reset() */
+static unsigned hw_ep_max;
+
+/**
+ * hw_ep_bit: calculates the bit number
+ * @num: endpoint number
+ * @dir: endpoint direction
+ *
+ * This function returns bit number
+ */
+static inline int hw_ep_bit(int num, int dir)
+{
+ return num + (dir ? 16 : 0);
+}
+
+/**
+ * hw_aread: reads from register bitfield
+ * @addr: address relative to bus map
+ * @mask: bitfield mask
+ *
+ * This function returns register bitfield data
+ */
+static u32 hw_aread(u32 addr, u32 mask)
+{
+ return ioread32(addr + hw_bank.abs) & mask;
+}
+
+/**
+ * hw_awrite: writes to register bitfield
+ * @addr: address relative to bus map
+ * @mask: bitfield mask
+ * @data: new data
+ */
+static void hw_awrite(u32 addr, u32 mask, u32 data)
+{
+ iowrite32(hw_aread(addr, ~mask) | (data & mask),
+ addr + hw_bank.abs);
+}
+
+/**
+ * hw_cread: reads from register bitfield
+ * @addr: address relative to CAP offset plus content
+ * @mask: bitfield mask
+ *
+ * This function returns register bitfield data
+ */
+static u32 hw_cread(u32 addr, u32 mask)
+{
+ return ioread32(addr + hw_bank.cap) & mask;
+}
+
+/**
+ * hw_cwrite: writes to register bitfield
+ * @addr: address relative to CAP offset plus content
+ * @mask: bitfield mask
+ * @data: new data
+ */
+static void hw_cwrite(u32 addr, u32 mask, u32 data)
+{
+ iowrite32(hw_cread(addr, ~mask) | (data & mask),
+ addr + hw_bank.cap);
+}
+
+/**
+ * hw_ctest_and_clear: tests & clears register bitfield
+ * @addr: address relative to CAP offset plus content
+ * @mask: bitfield mask
+ *
+ * This function returns register bitfield data
+ */
+static u32 hw_ctest_and_clear(u32 addr, u32 mask)
+{
+ u32 reg = hw_cread(addr, mask);
+
+ iowrite32(reg, addr + hw_bank.cap);
+ return reg;
+}
+
+/**
+ * hw_ctest_and_write: tests & writes register bitfield
+ * @addr: address relative to CAP offset plus content
+ * @mask: bitfield mask
+ * @data: new data
+ *
+ * This function returns register bitfield data
+ */
+static u32 hw_ctest_and_write(u32 addr, u32 mask, u32 data)
+{
+ u32 reg = hw_cread(addr, ~0);
+
+ iowrite32((reg & ~mask) | (data & mask), addr + hw_bank.cap);
+ return (reg & mask) >> ffs_nr(mask);
+}
+
+/**
+ * hw_device_reset: resets chip (execute without interruption)
+ * @base: register base address
+ *
+ * This function returns an error code
+ */
+static int hw_device_reset(void __iomem *base)
+{
+ u32 reg;
+
+ /* bank is a module variable */
+ hw_bank.abs = base;
+
+ hw_bank.cap = hw_bank.abs;
+ hw_bank.cap += ABS_CAPLENGTH;
+ hw_bank.cap += ioread8(hw_bank.cap);
+
+ reg = hw_aread(ABS_HCCPARAMS, HCCPARAMS_LEN) >> ffs_nr(HCCPARAMS_LEN);
+ hw_bank.lpm = reg;
+ hw_bank.size = hw_bank.cap - hw_bank.abs;
+ hw_bank.size += CAP_LAST;
+ hw_bank.size /= sizeof(u32);
+
+ /* should flush & stop before reset */
+ hw_cwrite(CAP_ENDPTFLUSH, ~0, ~0);
+ hw_cwrite(CAP_USBCMD, USBCMD_RS, 0);
+
+ hw_cwrite(CAP_USBCMD, USBCMD_RST, USBCMD_RST);
+ while (hw_cread(CAP_USBCMD, USBCMD_RST))
+ udelay(10); /* not RTOS friendly */
+
+ /* USBMODE should be configured step by step */
+ hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
+ hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_DEVICE);
+ hw_cwrite(CAP_USBMODE, USBMODE_SLOM, USBMODE_SLOM); /* HW >= 2.3 */
+
+ if (hw_cread(CAP_USBMODE, USBMODE_CM) != USBMODE_CM_DEVICE) {
+ pr_err("cannot enter in device mode");
+ pr_err("lpm = %i", hw_bank.lpm);
+ return -ENODEV;
+ }
+
+ reg = hw_aread(ABS_DCCPARAMS, DCCPARAMS_DEN) >> ffs_nr(DCCPARAMS_DEN);
+ if (reg == 0 || reg > ENDPT_MAX)
+ return -ENODEV;
+
+ hw_ep_max = reg; /* cache hw ENDPT_MAX */
+
+ /* setup lock mode ? */
+
+ /* ENDPTSETUPSTAT is '0' by default */
+
+ /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
+
+ return 0;
+}
+
+/**
+ * hw_device_state: enables/disables interrupts & starts/stops device (execute
+ * without interruption)
+ * @dma: 0 => disable, !0 => enable and set dma engine
+ *
+ * This function returns an error code
+ */
+static int hw_device_state(u32 dma)
+{
+ if (dma) {
+ hw_cwrite(CAP_ENDPTLISTADDR, ~0, dma);
+ /* interrupt, error, port change, reset, sleep/suspend */
+ hw_cwrite(CAP_USBINTR, ~0,
+ USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
+ hw_cwrite(CAP_USBCMD, USBCMD_RS, USBCMD_RS);
+ } else {
+ hw_cwrite(CAP_USBCMD, USBCMD_RS, 0);
+ hw_cwrite(CAP_USBINTR, ~0, 0);
+ }
+ return 0;
+}
+
+/**
+ * hw_ep_flush: flush endpoint fifo (execute without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ *
+ * This function returns an error code
+ */
+static int hw_ep_flush(int num, int dir)
+{
+ int n = hw_ep_bit(num, dir);
+
+ do {
+ /* flush any pending transfer */
+ hw_cwrite(CAP_ENDPTFLUSH, BIT(n), BIT(n));
+ while (hw_cread(CAP_ENDPTFLUSH, BIT(n)))
+ cpu_relax();
+ } while (hw_cread(CAP_ENDPTSTAT, BIT(n)));
+
+ return 0;
+}
+
+/**
+ * hw_ep_disable: disables endpoint (execute without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ *
+ * This function returns an error code
+ */
+static int hw_ep_disable(int num, int dir)
+{
+ hw_ep_flush(num, dir);
+ hw_cwrite(CAP_ENDPTCTRL + num * sizeof(u32),
+ dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
+ return 0;
+}
+
+/**
+ * hw_ep_enable: enables endpoint (execute without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ * @type: endpoint type
+ *
+ * This function returns an error code
+ */
+static int hw_ep_enable(int num, int dir, int type)
+{
+ u32 mask, data;
+
+ if (dir) {
+ mask = ENDPTCTRL_TXT; /* type */
+ data = type << ffs_nr(mask);
+
+ mask |= ENDPTCTRL_TXS; /* unstall */
+ mask |= ENDPTCTRL_TXR; /* reset data toggle */
+ data |= ENDPTCTRL_TXR;
+ mask |= ENDPTCTRL_TXE; /* enable */
+ data |= ENDPTCTRL_TXE;
+ } else {
+ mask = ENDPTCTRL_RXT; /* type */
+ data = type << ffs_nr(mask);
+
+ mask |= ENDPTCTRL_RXS; /* unstall */
+ mask |= ENDPTCTRL_RXR; /* reset data toggle */
+ data |= ENDPTCTRL_RXR;
+ mask |= ENDPTCTRL_RXE; /* enable */
+ data |= ENDPTCTRL_RXE;
+ }
+ hw_cwrite(CAP_ENDPTCTRL + num * sizeof(u32), mask, data);
+ return 0;
+}
+
+/**
+ * hw_ep_get_halt: return endpoint halt status
+ * @num: endpoint number
+ * @dir: endpoint direction
+ *
+ * This function returns 1 if endpoint halted
+ */
+static int hw_ep_get_halt(int num, int dir)
+{
+ u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
+
+ return hw_cread(CAP_ENDPTCTRL + num * sizeof(u32), mask) ? 1 : 0;
+}
+
+/**
+ * hw_ep_is_primed: test if endpoint is primed (execute without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ *
+ * This function returns true if endpoint primed
+ */
+static int hw_ep_is_primed(int num, int dir)
+{
+ u32 reg = hw_cread(CAP_ENDPTPRIME, ~0) | hw_cread(CAP_ENDPTSTAT, ~0);
+
+ return test_bit(hw_ep_bit(num, dir), (void *)®);
+}
+
+/**
+ * hw_test_and_clear_setup_status: test & clear setup status (execute without
+ * interruption)
+ * @n: bit number (endpoint)
+ *
+ * This function returns setup status
+ */
+static int hw_test_and_clear_setup_status(int n)
+{
+ return hw_ctest_and_clear(CAP_ENDPTSETUPSTAT, BIT(n));
+}
+
+/**
+ * hw_ep_prime: primes endpoint (execute without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ * @is_ctrl: true if control endpoint
+ *
+ * This function returns an error code
+ */
+static int hw_ep_prime(int num, int dir, int is_ctrl)
+{
+ int n = hw_ep_bit(num, dir);
+
+ /* the caller should flush first */
+ if (hw_ep_is_primed(num, dir))
+ return -EBUSY;
+
+ if (is_ctrl && dir == RX && hw_cread(CAP_ENDPTSETUPSTAT, BIT(num)))
+ return -EAGAIN;
+
+ hw_cwrite(CAP_ENDPTPRIME, BIT(n), BIT(n));
+
+ while (hw_cread(CAP_ENDPTPRIME, BIT(n)))
+ cpu_relax();
+ if (is_ctrl && dir == RX && hw_cread(CAP_ENDPTSETUPSTAT, BIT(num)))
+ return -EAGAIN;
+
+ /* status shoult be tested according with manual but it doesn't work */
+ return 0;
+}
+
+/**
+ * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
+ * without interruption)
+ * @num: endpoint number
+ * @dir: endpoint direction
+ * @value: true => stall, false => unstall
+ *
+ * This function returns an error code
+ */
+static int hw_ep_set_halt(int num, int dir, int value)
+{
+ if (value != 0 && value != 1)
+ return -EINVAL;
+
+ do {
+ u32 addr = CAP_ENDPTCTRL + num * sizeof(u32);
+ u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
+ u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
+
+ /* data toggle - reserved for EP0 but it's in ESS */
+ hw_cwrite(addr, mask_xs|mask_xr, value ? mask_xs : mask_xr);
+
+ } while (value != hw_ep_get_halt(num, dir));
+
+ return 0;
+}
+
+/**
+ * hw_intr_clear: disables interrupt & clears interrupt status (execute without
+ * interruption)
+ * @n: interrupt bit
+ *
+ * This function returns an error code
+ */
+static int hw_intr_clear(int n)
+{
+ if (n >= REG_BITS)
+ return -EINVAL;
+
+ hw_cwrite(CAP_USBINTR, BIT(n), 0);
+ hw_cwrite(CAP_USBSTS, BIT(n), BIT(n));
+ return 0;
+}
+
+/**
+ * hw_intr_force: enables interrupt & forces interrupt status (execute without
+ * interruption)
+ * @n: interrupt bit
+ *
+ * This function returns an error code
+ */
+static int hw_intr_force(int n)
+{
+ if (n >= REG_BITS)
+ return -EINVAL;
+
+ hw_awrite(ABS_TESTMODE, TESTMODE_FORCE, TESTMODE_FORCE);
+ hw_cwrite(CAP_USBINTR, BIT(n), BIT(n));
+ hw_cwrite(CAP_USBSTS, BIT(n), BIT(n));
+ hw_awrite(ABS_TESTMODE, TESTMODE_FORCE, 0);
+ return 0;
+}
+
+/**
+ * hw_is_port_high_speed: test if port is high speed
+ *
+ * This function returns true if high speed port
+ */
+static int hw_port_is_high_speed(void)
+{
+ return hw_bank.lpm ? hw_cread(CAP_DEVLC, DEVLC_PSPD) :
+ hw_cread(CAP_PORTSC, PORTSC_HSP);
+}
+
+/**
+ * hw_port_test_get: reads port test mode value
+ *
+ * This function returns port test mode value
+ */
+static u8 hw_port_test_get(void)
+{
+ return hw_cread(CAP_PORTSC, PORTSC_PTC) >> ffs_nr(PORTSC_PTC);
+}
+
+/**
+ * hw_port_test_set: writes port test mode (execute without interruption)
+ * @mode: new value
+ *
+ * This function returns an error code
+ */
+static int hw_port_test_set(u8 mode)
+{
+ const u8 TEST_MODE_MAX = 7;
+
+ if (mode > TEST_MODE_MAX)
+ return -EINVAL;
+
+ hw_cwrite(CAP_PORTSC, PORTSC_PTC, mode << ffs_nr(PORTSC_PTC));
+ return 0;
+}
+
+/**
+ * hw_read_intr_enable: returns interrupt enable register
+ *
+ * This function returns register data
+ */
+static u32 hw_read_intr_enable(void)
+{
+ return hw_cread(CAP_USBINTR, ~0);
+}
+
+/**
+ * hw_read_intr_status: returns interrupt status register
+ *
+ * This function returns register data
+ */
+static u32 hw_read_intr_status(void)
+{
+ return hw_cread(CAP_USBSTS, ~0);
+}
+
+/**
+ * hw_register_read: reads all device registers (execute without interruption)
+ * @buf: destination buffer
+ * @size: buffer size
+ *
+ * This function returns number of registers read
+ */
+static size_t hw_register_read(u32 *buf, size_t size)
+{
+ unsigned i;
+
+ if (size > hw_bank.size)
+ size = hw_bank.size;
+
+ for (i = 0; i < size; i++)
+ buf[i] = hw_aread(i * sizeof(u32), ~0);
+
+ return size;
+}
+
+/**
+ * hw_register_write: writes to register
+ * @addr: register address
+ * @data: register value
+ *
+ * This function returns an error code
+ */
+static int hw_register_write(u16 addr, u32 data)
+{
+ /* align */
+ addr /= sizeof(u32);
+
+ if (addr >= hw_bank.size)
+ return -EINVAL;
+
+ /* align */
+ addr *= sizeof(u32);
+
+ hw_awrite(addr, ~0, data);
+ return 0;
+}
+
+/**
+ * hw_test_and_clear_complete: test & clear complete status (execute without
+ * interruption)
+ * @n: bit number (endpoint)
+ *
+ * This function returns complete status
+ */
+static int hw_test_and_clear_complete(int n)
+{
+ return hw_ctest_and_clear(CAP_ENDPTCOMPLETE, BIT(n));
+}
+
+/**
+ * hw_test_and_clear_intr_active: test & clear active interrupts (execute
+ * without interruption)
+ *
+ * This function returns active interrutps
+ */
+static u32 hw_test_and_clear_intr_active(void)
+{
+ u32 reg = hw_read_intr_status() & hw_read_intr_enable();
+
+ hw_cwrite(CAP_USBSTS, ~0, reg);
+ return reg;
+}
+
+/**
+ * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
+ * interruption)
+ *
+ * This function returns guard value
+ */
+static int hw_test_and_clear_setup_guard(void)
+{
+ return hw_ctest_and_write(CAP_USBCMD, USBCMD_SUTW, 0);
+}
+
+/**
+ * hw_test_and_set_setup_guard: test & set setup guard (execute without
+ * interruption)
+ *
+ * This function returns guard value
+ */
+static int hw_test_and_set_setup_guard(void)
+{
+ return hw_ctest_and_write(CAP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
+}
+
+/**
+ * hw_usb_set_address: configures USB address (execute without interruption)
+ * @value: new USB address
+ *
+ * This function returns an error code
+ */
+static int hw_usb_set_address(u8 value)
+{
+ /* advance */
+ hw_cwrite(CAP_DEVICEADDR, DEVICEADDR_USBADR | DEVICEADDR_USBADRA,
+ value << ffs_nr(DEVICEADDR_USBADR) | DEVICEADDR_USBADRA);
+ return 0;
+}
+
+/**
+ * hw_usb_reset: restart device after a bus reset (execute without
+ * interruption)
+ *
+ * This function returns an error code
+ */
+static int hw_usb_reset(void)
+{
+ hw_usb_set_address(0);
+
+ /* ESS flushes only at end?!? */
+ hw_cwrite(CAP_ENDPTFLUSH, ~0, ~0); /* flush all EPs */
+
+ /* clear setup token semaphores */
+ hw_cwrite(CAP_ENDPTSETUPSTAT, 0, 0); /* writes its content */
+
+ /* clear complete status */
+ hw_cwrite(CAP_ENDPTCOMPLETE, 0, 0); /* writes its content */
+
+ /* wait until all bits cleared */
+ while (hw_cread(CAP_ENDPTPRIME, ~0))
+ udelay(10); /* not RTOS friendly */
+
+ /* reset all endpoints ? */
+
+ /* reset internal status and wait for further instructions
+ no need to verify the port reset status (ESS does it) */
+
+ return 0;
+}
+
+/******************************************************************************
+ * DBG block
+ *****************************************************************************/
+/**
+ * show_device: prints information about device capabilities and status
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_device(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ struct usb_gadget *gadget = &udc->gadget;
+ int n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ n += scnprintf(buf + n, PAGE_SIZE - n, "speed = %d\n",
+ gadget->speed);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "is_dualspeed = %d\n",
+ gadget->is_dualspeed);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "is_otg = %d\n",
+ gadget->is_otg);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "is_a_peripheral = %d\n",
+ gadget->is_a_peripheral);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "b_hnp_enable = %d\n",
+ gadget->b_hnp_enable);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "a_hnp_support = %d\n",
+ gadget->a_hnp_support);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "a_alt_hnp_support = %d\n",
+ gadget->a_alt_hnp_support);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "name = %s\n",
+ (gadget->name ? gadget->name : ""));
+
+ return n;
+}
+static DEVICE_ATTR(device, S_IRUSR, show_device, NULL);
+
+/**
+ * show_driver: prints information about attached gadget (if any)
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_driver(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ struct usb_gadget_driver *driver = udc->driver;
+ int n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ if (driver == NULL)
+ return scnprintf(buf, PAGE_SIZE,
+ "There is no gadget attached!\n");
+
+ n += scnprintf(buf + n, PAGE_SIZE - n, "function = %s\n",
+ (driver->function ? driver->function : ""));
+ n += scnprintf(buf + n, PAGE_SIZE - n, "max speed = %d\n",
+ driver->speed);
+
+ return n;
+}
+static DEVICE_ATTR(driver, S_IRUSR, show_driver, NULL);
+
+/* Maximum event message length */
+#define DBG_DATA_MSG 64UL
+
+/* Maximum event messages */
+#define DBG_DATA_MAX 128UL
+
+/* Event buffer descriptor */
+static struct {
+ char (buf[DBG_DATA_MAX])[DBG_DATA_MSG]; /* buffer */
+ unsigned idx; /* index */
+ unsigned tty; /* print to console? */
+ rwlock_t lck; /* lock */
+} dbg_data = {
+ .idx = 0,
+ .tty = 0,
+ .lck = __RW_LOCK_UNLOCKED(lck)
+};
+
+/**
+ * dbg_dec: decrements debug event index
+ * @idx: buffer index
+ */
+static void dbg_dec(unsigned *idx)
+{
+ *idx = (*idx - 1) & (DBG_DATA_MAX-1);
+}
+
+/**
+ * dbg_inc: increments debug event index
+ * @idx: buffer index
+ */
+static void dbg_inc(unsigned *idx)
+{
+ *idx = (*idx + 1) & (DBG_DATA_MAX-1);
+}
+
+/**
+ * dbg_print: prints the common part of the event
+ * @addr: endpoint address
+ * @name: event name
+ * @status: status
+ * @extra: extra information
+ */
+static void dbg_print(u8 addr, const char *name, int status, const char *extra)
+{
+ struct timeval tval;
+ unsigned int stamp;
+ unsigned long flags;
+
+ write_lock_irqsave(&dbg_data.lck, flags);
+
+ do_gettimeofday(&tval);
+ stamp = tval.tv_sec & 0xFFFF; /* 2^32 = 4294967296. Limit to 4096s */
+ stamp = stamp * 1000000 + tval.tv_usec;
+
+ scnprintf(dbg_data.buf[dbg_data.idx], DBG_DATA_MSG,
+ "%04X\t» %02X %-7.7s %4i «\t%s\n",
+ stamp, addr, name, status, extra);
+
+ dbg_inc(&dbg_data.idx);
+
+ write_unlock_irqrestore(&dbg_data.lck, flags);
+
+ if (dbg_data.tty != 0)
+ pr_notice("%04X\t» %02X %-7.7s %4i «\t%s\n",
+ stamp, addr, name, status, extra);
+}
+
+/**
+ * dbg_done: prints a DONE event
+ * @addr: endpoint address
+ * @td: transfer descriptor
+ * @status: status
+ */
+static void dbg_done(u8 addr, const u32 token, int status)
+{
+ char msg[DBG_DATA_MSG];
+
+ scnprintf(msg, sizeof(msg), "%d %02X",
+ (int)(token & TD_TOTAL_BYTES) >> ffs_nr(TD_TOTAL_BYTES),
+ (int)(token & TD_STATUS) >> ffs_nr(TD_STATUS));
+ dbg_print(addr, "DONE", status, msg);
+}
+
+/**
+ * dbg_event: prints a generic event
+ * @addr: endpoint address
+ * @name: event name
+ * @status: status
+ */
+static void dbg_event(u8 addr, const char *name, int status)
+{
+ if (name != NULL)
+ dbg_print(addr, name, status, "");
+}
+
+/*
+ * dbg_queue: prints a QUEUE event
+ * @addr: endpoint address
+ * @req: USB request
+ * @status: status
+ */
+static void dbg_queue(u8 addr, const struct usb_request *req, int status)
+{
+ char msg[DBG_DATA_MSG];
+
+ if (req != NULL) {
+ scnprintf(msg, sizeof(msg),
+ "%d %d", !req->no_interrupt, req->length);
+ dbg_print(addr, "QUEUE", status, msg);
+ }
+}
+
+/**
+ * dbg_setup: prints a SETUP event
+ * @addr: endpoint address
+ * @req: setup request
+ */
+static void dbg_setup(u8 addr, const struct usb_ctrlrequest *req)
+{
+ char msg[DBG_DATA_MSG];
+
+ if (req != NULL) {
+ scnprintf(msg, sizeof(msg),
+ "%02X %02X %04X %04X %d", req->bRequestType,
+ req->bRequest, le16_to_cpu(req->wValue),
+ le16_to_cpu(req->wIndex), le16_to_cpu(req->wLength));
+ dbg_print(addr, "SETUP", 0, msg);
+ }
+}
+
+/**
+ * show_events: displays the event buffer
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_events(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long flags;
+ unsigned i, j, n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ read_lock_irqsave(&dbg_data.lck, flags);
+
+ i = dbg_data.idx;
+ for (dbg_dec(&i); i != dbg_data.idx; dbg_dec(&i)) {
+ n += strlen(dbg_data.buf[i]);
+ if (n >= PAGE_SIZE) {
+ n -= strlen(dbg_data.buf[i]);
+ break;
+ }
+ }
+ for (j = 0, dbg_inc(&i); j < n; dbg_inc(&i))
+ j += scnprintf(buf + j, PAGE_SIZE - j,
+ "%s", dbg_data.buf[i]);
+
+ read_unlock_irqrestore(&dbg_data.lck, flags);
+
+ return n;
+}
+
+/**
+ * store_events: configure if events are going to be also printed to console
+ *
+ * Check "device.h" for details
+ */
+static ssize_t store_events(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned tty;
+
+ dbg_trace("[%s] %p, %d\n", __func__, buf, count);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ goto done;
+ }
+
+ if (sscanf(buf, "%u", &tty) != 1 || tty > 1) {
+ dev_err(dev, "<1|0>: enable|disable console log\n");
+ goto done;
+ }
+
+ dbg_data.tty = tty;
+ dev_info(dev, "tty = %u", dbg_data.tty);
+
+ done:
+ return count;
+}
+static DEVICE_ATTR(events, S_IRUSR | S_IWUSR, show_events, store_events);
+
+/**
+ * show_inters: interrupt status, enable status and historic
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_inters(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ u32 intr;
+ unsigned i, j, n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ "status = %08x\n", hw_read_intr_status());
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ "enable = %08x\n", hw_read_intr_enable());
+
+ n += scnprintf(buf + n, PAGE_SIZE - n, "*test = %d\n",
+ isr_statistics.test);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "» ui = %d\n",
+ isr_statistics.ui);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "» uei = %d\n",
+ isr_statistics.uei);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "» pci = %d\n",
+ isr_statistics.pci);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "» uri = %d\n",
+ isr_statistics.uri);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "» sli = %d\n",
+ isr_statistics.sli);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "*none = %d\n",
+ isr_statistics.none);
+ n += scnprintf(buf + n, PAGE_SIZE - n, "*hndl = %d\n",
+ isr_statistics.hndl.cnt);
+
+ for (i = isr_statistics.hndl.idx, j = 0; j <= ISR_MASK; j++, i++) {
+ i &= ISR_MASK;
+ intr = isr_statistics.hndl.buf[i];
+
+ if (USBi_UI & intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "ui ");
+ intr &= ~USBi_UI;
+ if (USBi_UEI & intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "uei ");
+ intr &= ~USBi_UEI;
+ if (USBi_PCI & intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "pci ");
+ intr &= ~USBi_PCI;
+ if (USBi_URI & intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "uri ");
+ intr &= ~USBi_URI;
+ if (USBi_SLI & intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "sli ");
+ intr &= ~USBi_SLI;
+ if (intr)
+ n += scnprintf(buf + n, PAGE_SIZE - n, "??? ");
+ if (isr_statistics.hndl.buf[i])
+ n += scnprintf(buf + n, PAGE_SIZE - n, "\n");
+ }
+
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ return n;
+}
+
+/**
+ * store_inters: enable & force or disable an individual interrutps
+ * (to be used for test purposes only)
+ *
+ * Check "device.h" for details
+ */
+static ssize_t store_inters(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ unsigned en, bit;
+
+ dbg_trace("[%s] %p, %d\n", __func__, buf, count);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ goto done;
+ }
+
+ if (sscanf(buf, "%u %u", &en, &bit) != 2 || en > 1) {
+ dev_err(dev, "<1|0> <bit>: enable|disable interrupt");
+ goto done;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ if (en) {
+ if (hw_intr_force(bit))
+ dev_err(dev, "invalid bit number\n");
+ else
+ isr_statistics.test++;
+ } else {
+ if (hw_intr_clear(bit))
+ dev_err(dev, "invalid bit number\n");
+ }
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ done:
+ return count;
+}
+static DEVICE_ATTR(inters, S_IRUSR | S_IWUSR, show_inters, store_inters);
+
+/**
+ * show_port_test: reads port test mode
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_port_test(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ unsigned mode;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ mode = hw_port_test_get();
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ return scnprintf(buf, PAGE_SIZE, "mode = %u\n", mode);
+}
+
+/**
+ * store_port_test: writes port test mode
+ *
+ * Check "device.h" for details
+ */
+static ssize_t store_port_test(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ unsigned mode;
+
+ dbg_trace("[%s] %p, %d\n", __func__, buf, count);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ goto done;
+ }
+
+ if (sscanf(buf, "%u", &mode) != 1) {
+ dev_err(dev, "<mode>: set port test mode");
+ goto done;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ if (hw_port_test_set(mode))
+ dev_err(dev, "invalid mode\n");
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ done:
+ return count;
+}
+static DEVICE_ATTR(port_test, S_IRUSR | S_IWUSR,
+ show_port_test, store_port_test);
+
+/**
+ * show_qheads: DMA contents of all queue heads
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_qheads(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ unsigned i, j, n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ for (i = 0; i < hw_ep_max; i++) {
+ struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ "EP=%02i: RX=%08X TX=%08X\n",
+ i, (u32)mEp->qh[RX].dma, (u32)mEp->qh[TX].dma);
+ for (j = 0; j < (sizeof(struct ci13xxx_qh)/sizeof(u32)); j++) {
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ " %04X: %08X %08X\n", j,
+ *((u32 *)mEp->qh[RX].ptr + j),
+ *((u32 *)mEp->qh[TX].ptr + j));
+ }
+ }
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ return n;
+}
+static DEVICE_ATTR(qheads, S_IRUSR, show_qheads, NULL);
+
+/**
+ * show_registers: dumps all registers
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_registers(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ u32 dump[512];
+ unsigned i, k, n = 0;
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ k = hw_register_read(dump, sizeof(dump)/sizeof(u32));
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ for (i = 0; i < k; i++) {
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ "reg[0x%04X] = 0x%08X\n",
+ i * (unsigned)sizeof(u32), dump[i]);
+ }
+
+ return n;
+}
+
+/**
+ * store_registers: writes value to register address
+ *
+ * Check "device.h" for details
+ */
+static ssize_t store_registers(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long addr, data, flags;
+
+ dbg_trace("[%s] %p, %d\n", __func__, buf, count);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ goto done;
+ }
+
+ if (sscanf(buf, "%li %li", &addr, &data) != 2) {
+ dev_err(dev, "<addr> <data>: write data to register address");
+ goto done;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ if (hw_register_write(addr, data))
+ dev_err(dev, "invalid address range\n");
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ done:
+ return count;
+}
+static DEVICE_ATTR(registers, S_IRUSR | S_IWUSR,
+ show_registers, store_registers);
+
+/**
+ * show_requests: DMA contents of all requests currently queued (all endpts)
+ *
+ * Check "device.h" for details
+ */
+static ssize_t show_requests(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *udc = container_of(dev, struct ci13xxx, gadget.dev);
+ unsigned long flags;
+ struct list_head *ptr = NULL;
+ struct ci13xxx_req *req = NULL;
+ unsigned i, j, k, n = 0, qSize = sizeof(struct ci13xxx_td)/sizeof(u32);
+
+ dbg_trace("[%s] %p\n", __func__, buf);
+ if (attr == NULL || buf == NULL) {
+ dev_err(dev, "[%s] EINVAL\n", __func__);
+ return 0;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+ for (i = 0; i < hw_ep_max; i++)
+ for (k = RX; k <= TX; k++)
+ list_for_each(ptr, &udc->ci13xxx_ep[i].qh[k].queue)
+ {
+ req = list_entry(ptr,
+ struct ci13xxx_req, queue);
+
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ "EP=%02i: TD=%08X %s\n",
+ i, (u32)req->dma,
+ ((k == RX) ? "RX" : "TX"));
+
+ for (j = 0; j < qSize; j++)
+ n += scnprintf(buf + n, PAGE_SIZE - n,
+ " %04X: %08X\n", j,
+ *((u32 *)req->ptr + j));
+ }
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ return n;
+}
+static DEVICE_ATTR(requests, S_IRUSR, show_requests, NULL);
+
+/**
+ * dbg_create_files: initializes the attribute interface
+ * @dev: device
+ *
+ * This function returns an error code
+ */
+__maybe_unused static int dbg_create_files(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev == NULL)
+ return -EINVAL;
+ retval = device_create_file(dev, &dev_attr_device);
+ if (retval)
+ goto done;
+ retval = device_create_file(dev, &dev_attr_driver);
+ if (retval)
+ goto rm_device;
+ retval = device_create_file(dev, &dev_attr_events);
+ if (retval)
+ goto rm_driver;
+ retval = device_create_file(dev, &dev_attr_inters);
+ if (retval)
+ goto rm_events;
+ retval = device_create_file(dev, &dev_attr_port_test);
+ if (retval)
+ goto rm_inters;
+ retval = device_create_file(dev, &dev_attr_qheads);
+ if (retval)
+ goto rm_port_test;
+ retval = device_create_file(dev, &dev_attr_registers);
+ if (retval)
+ goto rm_qheads;
+ retval = device_create_file(dev, &dev_attr_requests);
+ if (retval)
+ goto rm_registers;
+ return 0;
+
+ rm_registers:
+ device_remove_file(dev, &dev_attr_registers);
+ rm_qheads:
+ device_remove_file(dev, &dev_attr_qheads);
+ rm_port_test:
+ device_remove_file(dev, &dev_attr_port_test);
+ rm_inters:
+ device_remove_file(dev, &dev_attr_inters);
+ rm_events:
+ device_remove_file(dev, &dev_attr_events);
+ rm_driver:
+ device_remove_file(dev, &dev_attr_driver);
+ rm_device:
+ device_remove_file(dev, &dev_attr_device);
+ done:
+ return retval;
+}
+
+/**
+ * dbg_remove_files: destroys the attribute interface
+ * @dev: device
+ *
+ * This function returns an error code
+ */
+__maybe_unused static int dbg_remove_files(struct device *dev)
+{
+ if (dev == NULL)
+ return -EINVAL;
+ device_remove_file(dev, &dev_attr_requests);
+ device_remove_file(dev, &dev_attr_registers);
+ device_remove_file(dev, &dev_attr_qheads);
+ device_remove_file(dev, &dev_attr_port_test);
+ device_remove_file(dev, &dev_attr_inters);
+ device_remove_file(dev, &dev_attr_events);
+ device_remove_file(dev, &dev_attr_driver);
+ device_remove_file(dev, &dev_attr_device);
+ return 0;
+}
+
+/******************************************************************************
+ * UTIL block
+ *****************************************************************************/
+/**
+ * _usb_addr: calculates endpoint address from direction & number
+ * @ep: endpoint
+ */
+static inline u8 _usb_addr(struct ci13xxx_ep *ep)
+{
+ return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
+}
+
+/**
+ * _hardware_queue: configures a request at hardware level
+ * @gadget: gadget
+ * @mEp: endpoint
+ *
+ * This function returns an error code
+ */
+static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
+{
+ unsigned i;
+
+ trace("%p, %p", mEp, mReq);
+
+ /* don't queue twice */
+ if (mReq->req.status == -EALREADY)
+ return -EALREADY;
+
+ if (hw_ep_is_primed(mEp->num, mEp->dir))
+ return -EBUSY;
+
+ mReq->req.status = -EALREADY;
+
+ if (mReq->req.length && !mReq->req.dma) {
+ mReq->req.dma = \
+ dma_map_single(mEp->device, mReq->req.buf,
+ mReq->req.length, mEp->dir ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (mReq->req.dma == 0)
+ return -ENOMEM;
+
+ mReq->map = 1;
+ }
+
+ /*
+ * TD configuration
+ * TODO - handle requests which spawns into several TDs
+ */
+ memset(mReq->ptr, 0, sizeof(*mReq->ptr));
+ mReq->ptr->next |= TD_TERMINATE;
+ mReq->ptr->token = mReq->req.length << ffs_nr(TD_TOTAL_BYTES);
+ mReq->ptr->token &= TD_TOTAL_BYTES;
+ mReq->ptr->token |= TD_IOC;
+ mReq->ptr->token |= TD_STATUS_ACTIVE;
+ mReq->ptr->page[0] = mReq->req.dma;
+ for (i = 1; i < 5; i++)
+ mReq->ptr->page[i] =
+ (mReq->req.dma + i * PAGE_SIZE) & ~TD_RESERVED_MASK;
+
+ /*
+ * QH configuration
+ * At this point it's guaranteed exclusive access to qhead
+ * (endpt is not primed) so it's no need to use tripwire
+ */
+ mEp->qh[mEp->dir].ptr->td.next = mReq->dma; /* TERMINATE = 0 */
+ mEp->qh[mEp->dir].ptr->td.token &= ~TD_STATUS; /* clear status */
+ if (mReq->req.zero == 0)
+ mEp->qh[mEp->dir].ptr->cap |= QH_ZLT;
+ else
+ mEp->qh[mEp->dir].ptr->cap &= ~QH_ZLT;
+
+ wmb(); /* synchronize before ep prime */
+
+ return hw_ep_prime(mEp->num, mEp->dir,
+ mEp->type == USB_ENDPOINT_XFER_CONTROL);
+}
+
+/**
+ * _hardware_dequeue: handles a request at hardware level
+ * @gadget: gadget
+ * @mEp: endpoint
+ *
+ * This function returns an error code
+ */
+static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
+{
+ trace("%p, %p", mEp, mReq);
+
+ if (mReq->req.status != -EALREADY)
+ return -EINVAL;
+
+ if (hw_ep_is_primed(mEp->num, mEp->dir))
+ hw_ep_flush(mEp->num, mEp->dir);
+
+ mReq->req.status = 0;
+
+ if (mReq->map) {
+ dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length,
+ mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ mReq->req.dma = 0;
+ mReq->map = 0;
+ }
+
+ mReq->req.status = mReq->ptr->token & TD_STATUS;
+ if ((TD_STATUS_ACTIVE & mReq->req.status) != 0)
+ mReq->req.status = -ECONNRESET;
+ else if ((TD_STATUS_HALTED & mReq->req.status) != 0)
+ mReq->req.status = -1;
+ else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
+ mReq->req.status = -1;
+ else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
+ mReq->req.status = -1;
+
+ mReq->req.actual = mReq->ptr->token & TD_TOTAL_BYTES;
+ mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
+ mReq->req.actual = mReq->req.length - mReq->req.actual;
+ mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
+
+ return mReq->req.actual;
+}
+
+/**
+ * _ep_nuke: dequeues all endpoint requests
+ * @mEp: endpoint
+ *
+ * This function returns an error code
+ * Caller must hold lock
+ */
+static int _ep_nuke(struct ci13xxx_ep *mEp)
+__releases(mEp->lock)
+__acquires(mEp->lock)
+{
+ trace("%p", mEp);
+
+ if (mEp == NULL)
+ return -EINVAL;
+
+ hw_ep_flush(mEp->num, mEp->dir);
+
+ while (!list_empty(&mEp->qh[mEp->dir].queue)) {
+
+ /* pop oldest request */
+ struct ci13xxx_req *mReq = \
+ list_entry(mEp->qh[mEp->dir].queue.next,
+ struct ci13xxx_req, queue);
+ list_del_init(&mReq->queue);
+ mReq->req.status = -ESHUTDOWN;
+
+ if (!mReq->req.no_interrupt && mReq->req.complete != NULL) {
+ spin_unlock(mEp->lock);
+ mReq->req.complete(&mEp->ep, &mReq->req);
+ spin_lock(mEp->lock);
+ }
+ }
+ return 0;
+}
+
+/**
+ * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
+ * @gadget: gadget
+ *
+ * This function returns an error code
+ * Caller must hold lock
+ */
+static int _gadget_stop_activity(struct usb_gadget *gadget)
+__releases(udc->lock)
+__acquires(udc->lock)
+{
+ struct usb_ep *ep;
+ struct ci13xxx *udc = container_of(gadget, struct ci13xxx, gadget);
+ struct ci13xxx_ep *mEp = container_of(gadget->ep0,
+ struct ci13xxx_ep, ep);
+
+ trace("%p", gadget);
+
+ if (gadget == NULL)
+ return -EINVAL;
+
+ spin_unlock(udc->lock);
+
+ /* flush all endpoints */
+ gadget_for_each_ep(ep, gadget) {
+ usb_ep_fifo_flush(ep);
+ }
+ usb_ep_fifo_flush(gadget->ep0);
+
+ udc->driver->disconnect(gadget);
+
+ /* make sure to disable all endpoints */
+ gadget_for_each_ep(ep, gadget) {
+ usb_ep_disable(ep);
+ }
+ usb_ep_disable(gadget->ep0);
+
+ if (mEp->status != NULL) {
+ usb_ep_free_request(gadget->ep0, mEp->status);
+ mEp->status = NULL;
+ }
+
+ spin_lock(udc->lock);
+
+ return 0;
+}
+
+/******************************************************************************
+ * ISR block
+ *****************************************************************************/
+/**
+ * isr_reset_handler: USB reset interrupt handler
+ * @udc: UDC device
+ *
+ * This function resets USB engine after a bus reset occurred
+ */
+static void isr_reset_handler(struct ci13xxx *udc)
+__releases(udc->lock)
+__acquires(udc->lock)
+{
+ struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[0];
+ int retval;
+
+ trace("%p", udc);
+
+ if (udc == NULL) {
+ err("EINVAL");
+ return;
+ }
+
+ dbg_event(0xFF, "BUS RST", 0);
+
+ retval = _gadget_stop_activity(&udc->gadget);
+ if (retval)
+ goto done;
+
+ retval = hw_usb_reset();
+ if (retval)
+ goto done;
+
+ spin_unlock(udc->lock);
+ retval = usb_ep_enable(&mEp->ep, &ctrl_endpt_desc);
+ if (!retval) {
+ mEp->status = usb_ep_alloc_request(&mEp->ep, GFP_KERNEL);
+ if (mEp->status == NULL) {
+ usb_ep_disable(&mEp->ep);
+ retval = -ENOMEM;
+ }
+ }
+ spin_lock(udc->lock);
+
+ done:
+ if (retval)
+ err("error: %i", retval);
+}
+
+/**
+ * isr_get_status_complete: get_status request complete function
+ * @ep: endpoint
+ * @req: request handled
+ *
+ * Caller must release lock
+ */
+static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ trace("%p, %p", ep, req);
+
+ if (ep == NULL || req == NULL) {
+ err("EINVAL");
+ return;
+ }
+
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+}
+
+/**
+ * isr_get_status_response: get_status request response
+ * @ep: endpoint
+ * @setup: setup request packet
+ *
+ * This function returns an error code
+ */
+static int isr_get_status_response(struct ci13xxx_ep *mEp,
+ struct usb_ctrlrequest *setup)
+__releases(mEp->lock)
+__acquires(mEp->lock)
+{
+ struct usb_request *req = NULL;
+ gfp_t gfp_flags = GFP_ATOMIC;
+ int dir, num, retval;
+
+ trace("%p, %p", mEp, setup);
+
+ if (mEp == NULL || setup == NULL)
+ return -EINVAL;
+
+ spin_unlock(mEp->lock);
+ req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
+ spin_lock(mEp->lock);
+ if (req == NULL)
+ return -ENOMEM;
+
+ req->complete = isr_get_status_complete;
+ req->length = 2;
+ req->buf = kzalloc(req->length, gfp_flags);
+ if (req->buf == NULL) {
+ retval = -ENOMEM;
+ goto err_free_req;
+ }
+
+ if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
+ /* TODO: D1 - Remote Wakeup; D0 - Self Powered */
+ retval = 0;
+ } else if ((setup->bRequestType & USB_RECIP_MASK) \
+ == USB_RECIP_ENDPOINT) {
+ dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
+ TX : RX;
+ num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
+ *((u16 *)req->buf) = hw_ep_get_halt(num, dir);
+ }
+ /* else do nothing; reserved for future use */
+
+ spin_unlock(mEp->lock);
+ retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
+ spin_lock(mEp->lock);
+ if (retval)
+ goto err_free_buf;
+
+ return 0;
+
+ err_free_buf:
+ kfree(req->buf);
+ err_free_req:
+ spin_unlock(mEp->lock);
+ usb_ep_free_request(&mEp->ep, req);
+ spin_lock(mEp->lock);
+ return retval;
+}
+
+/**
+ * isr_setup_status_phase: queues the status phase of a setup transation
+ * @mEp: endpoint
+ *
+ * This function returns an error code
+ */
+static int isr_setup_status_phase(struct ci13xxx_ep *mEp)
+__releases(mEp->lock)
+__acquires(mEp->lock)
+{
+ int retval;
+
+ trace("%p", mEp);
+
+ /* mEp is always valid & configured */
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
+ mEp->dir = (mEp->dir == TX) ? RX : TX;
+
+ mEp->status->no_interrupt = 1;
+
+ spin_unlock(mEp->lock);
+ retval = usb_ep_queue(&mEp->ep, mEp->status, GFP_ATOMIC);
+ spin_lock(mEp->lock);
+
+ return retval;
+}
+
+/**
+ * isr_tr_complete_low: transaction complete low level handler
+ * @mEp: endpoint
+ *
+ * This function returns an error code
+ * Caller must hold lock
+ */
+static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
+__releases(mEp->lock)
+__acquires(mEp->lock)
+{
+ struct ci13xxx_req *mReq;
+ int retval;
+
+ trace("%p", mEp);
+
+ if (list_empty(&mEp->qh[mEp->dir].queue))
+ return -EINVAL;
+
+ /* pop oldest request */
+ mReq = list_entry(mEp->qh[mEp->dir].queue.next,
+ struct ci13xxx_req, queue);
+ list_del_init(&mReq->queue);
+
+ retval = _hardware_dequeue(mEp, mReq);
+ if (retval < 0) {
+ dbg_event(_usb_addr(mEp), "DONE", retval);
+ goto done;
+ }
+
+ dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
+
+ if (!mReq->req.no_interrupt && mReq->req.complete != NULL) {
+ spin_unlock(mEp->lock);
+ mReq->req.complete(&mEp->ep, &mReq->req);
+ spin_lock(mEp->lock);
+ }
+
+ if (!list_empty(&mEp->qh[mEp->dir].queue)) {
+ mReq = list_entry(mEp->qh[mEp->dir].queue.next,
+ struct ci13xxx_req, queue);
+ _hardware_enqueue(mEp, mReq);
+ }
+
+ done:
+ return retval;
+}
+
+/**
+ * isr_tr_complete_handler: transaction complete interrupt handler
+ * @udc: UDC descriptor
+ *
+ * This function handles traffic events
+ */
+static void isr_tr_complete_handler(struct ci13xxx *udc)
+__releases(udc->lock)
+__acquires(udc->lock)
+{
+ unsigned i;
+
+ trace("%p", udc);
+
+ if (udc == NULL) {
+ err("EINVAL");
+ return;
+ }
+
+ for (i = 0; i < hw_ep_max; i++) {
+ struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
+ int type, num, err = -EINVAL;
+ struct usb_ctrlrequest req;
+
+
+ if (mEp->desc == NULL)
+ continue; /* not configured */
+
+ if ((mEp->dir == RX && hw_test_and_clear_complete(i)) ||
+ (mEp->dir == TX && hw_test_and_clear_complete(i + 16))) {
+ err = isr_tr_complete_low(mEp);
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
+ if (err > 0) /* needs status phase */
+ err = isr_setup_status_phase(mEp);
+ if (err < 0) {
+ dbg_event(_usb_addr(mEp),
+ "ERROR", err);
+ spin_unlock(udc->lock);
+ if (usb_ep_set_halt(&mEp->ep))
+ err("error: ep_set_halt");
+ spin_lock(udc->lock);
+ }
+ }
+ }
+
+ if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
+ !hw_test_and_clear_setup_status(i))
+ continue;
+
+ if (i != 0) {
+ warn("ctrl traffic received at endpoint");
+ continue;
+ }
+
+ /* read_setup_packet */
+ do {
+ hw_test_and_set_setup_guard();
+ memcpy(&req, &mEp->qh[RX].ptr->setup, sizeof(req));
+ } while (!hw_test_and_clear_setup_guard());
+
+ type = req.bRequestType;
+
+ mEp->dir = (type & USB_DIR_IN) ? TX : RX;
+
+ dbg_setup(_usb_addr(mEp), &req);
+
+ switch (req.bRequest) {
+ case USB_REQ_CLEAR_FEATURE:
+ if (type != (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
+ le16_to_cpu(req.wValue) != USB_ENDPOINT_HALT)
+ goto delegate;
+ if (req.wLength != 0)
+ break;
+ num = le16_to_cpu(req.wIndex);
+ num &= USB_ENDPOINT_NUMBER_MASK;
+ if (!udc->ci13xxx_ep[num].wedge) {
+ spin_unlock(udc->lock);
+ err = usb_ep_clear_halt(
+ &udc->ci13xxx_ep[num].ep);
+ spin_lock(udc->lock);
+ if (err)
+ break;
+ }
+ err = isr_setup_status_phase(mEp);
+ break;
+ case USB_REQ_GET_STATUS:
+ if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
+ type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
+ type != (USB_DIR_IN|USB_RECIP_INTERFACE))
+ goto delegate;
+ if (le16_to_cpu(req.wLength) != 2 ||
+ le16_to_cpu(req.wValue) != 0)
+ break;
+ err = isr_get_status_response(mEp, &req);
+ break;
+ case USB_REQ_SET_ADDRESS:
+ if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
+ goto delegate;
+ if (le16_to_cpu(req.wLength) != 0 ||
+ le16_to_cpu(req.wIndex) != 0)
+ break;
+ err = hw_usb_set_address((u8)le16_to_cpu(req.wValue));
+ if (err)
+ break;
+ err = isr_setup_status_phase(mEp);
+ break;
+ case USB_REQ_SET_FEATURE:
+ if (type != (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
+ le16_to_cpu(req.wValue) != USB_ENDPOINT_HALT)
+ goto delegate;
+ if (req.wLength != 0)
+ break;
+ num = le16_to_cpu(req.wIndex);
+ num &= USB_ENDPOINT_NUMBER_MASK;
+
+ spin_unlock(udc->lock);
+ err = usb_ep_set_halt(&udc->ci13xxx_ep[num].ep);
+ spin_lock(udc->lock);
+ if (err)
+ break;
+ err = isr_setup_status_phase(mEp);
+ break;
+ default:
+delegate:
+ if (req.wLength == 0) /* no data phase */
+ mEp->dir = TX;
+
+ spin_unlock(udc->lock);
+ err = udc->driver->setup(&udc->gadget, &req);
+ spin_lock(udc->lock);
+ break;
+ }
+
+ if (err < 0) {
+ dbg_event(_usb_addr(mEp), "ERROR", err);
+
+ spin_unlock(udc->lock);
+ if (usb_ep_set_halt(&mEp->ep))
+ err("error: ep_set_halt");
+ spin_lock(udc->lock);
+ }
+ }
+}
+
+/******************************************************************************
+ * ENDPT block
+ *****************************************************************************/
+/**
+ * ep_enable: configure endpoint, making it usable
+ *
+ * Check usb_ep_enable() at "usb_gadget.h" for details
+ */
+static int ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ int direction, retval = 0;
+ unsigned long flags;
+
+ trace("%p, %p", ep, desc);
+
+ if (ep == NULL || desc == NULL)
+ return -EINVAL;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ /* only internal SW should enable ctrl endpts */
+
+ mEp->desc = desc;
+
+ if (!list_empty(&mEp->qh[mEp->dir].queue))
+ warn("enabling a non-empty endpoint!");
+
+ mEp->dir = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? TX : RX;
+ mEp->num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+ mEp->type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+ mEp->ep.maxpacket = __constant_le16_to_cpu(desc->wMaxPacketSize);
+
+ direction = mEp->dir;
+ do {
+ dbg_event(_usb_addr(mEp), "ENABLE", 0);
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
+ mEp->qh[mEp->dir].ptr->cap |= QH_IOS;
+ else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
+ mEp->qh[mEp->dir].ptr->cap &= ~QH_MULT;
+ else
+ mEp->qh[mEp->dir].ptr->cap &= ~QH_ZLT;
+
+ mEp->qh[mEp->dir].ptr->cap |=
+ (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
+ mEp->qh[mEp->dir].ptr->td.next |= TD_TERMINATE; /* needed? */
+
+ retval |= hw_ep_enable(mEp->num, mEp->dir, mEp->type);
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
+ mEp->dir = (mEp->dir == TX) ? RX : TX;
+
+ } while (mEp->dir != direction);
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return retval;
+}
+
+/**
+ * ep_disable: endpoint is no longer usable
+ *
+ * Check usb_ep_disable() at "usb_gadget.h" for details
+ */
+static int ep_disable(struct usb_ep *ep)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ int direction, retval = 0;
+ unsigned long flags;
+
+ trace("%p", ep);
+
+ if (ep == NULL)
+ return -EINVAL;
+ else if (mEp->desc == NULL)
+ return -EBUSY;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ /* only internal SW should disable ctrl endpts */
+
+ direction = mEp->dir;
+ do {
+ dbg_event(_usb_addr(mEp), "DISABLE", 0);
+
+ retval |= _ep_nuke(mEp);
+ retval |= hw_ep_disable(mEp->num, mEp->dir);
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
+ mEp->dir = (mEp->dir == TX) ? RX : TX;
+
+ } while (mEp->dir != direction);
+
+ mEp->desc = NULL;
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return retval;
+}
+
+/**
+ * ep_alloc_request: allocate a request object to use with this endpoint
+ *
+ * Check usb_ep_alloc_request() at "usb_gadget.h" for details
+ */
+static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ struct ci13xxx_req *mReq = NULL;
+ unsigned long flags;
+
+ trace("%p, %i", ep, gfp_flags);
+
+ if (ep == NULL) {
+ err("EINVAL");
+ return NULL;
+ }
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
+ if (mReq != NULL) {
+ INIT_LIST_HEAD(&mReq->queue);
+
+ mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
+ &mReq->dma);
+ if (mReq->ptr == NULL) {
+ kfree(mReq);
+ mReq = NULL;
+ }
+ }
+
+ dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+
+ return (mReq == NULL) ? NULL : &mReq->req;
+}
+
+/**
+ * ep_free_request: frees a request object
+ *
+ * Check usb_ep_free_request() at "usb_gadget.h" for details
+ */
+static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
+ unsigned long flags;
+
+ trace("%p, %p", ep, req);
+
+ if (ep == NULL || req == NULL) {
+ err("EINVAL");
+ return;
+ } else if (!list_empty(&mReq->queue)) {
+ err("EBUSY");
+ return;
+ }
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ if (mReq->ptr)
+ dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
+ kfree(mReq);
+
+ dbg_event(_usb_addr(mEp), "FREE", 0);
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+}
+
+/**
+ * ep_queue: queues (submits) an I/O request to an endpoint
+ *
+ * Check usb_ep_queue()* at usb_gadget.h" for details
+ */
+static int ep_queue(struct usb_ep *ep, struct usb_request *req,
+ gfp_t __maybe_unused gfp_flags)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
+ int retval = 0;
+ unsigned long flags;
+
+ trace("%p, %p, %X", ep, req, gfp_flags);
+
+ if (ep == NULL || req == NULL || mEp->desc == NULL)
+ return -EINVAL;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL &&
+ !list_empty(&mEp->qh[mEp->dir].queue)) {
+ _ep_nuke(mEp);
+ retval = -EOVERFLOW;
+ warn("endpoint ctrl %X nuked", _usb_addr(mEp));
+ }
+
+ /* first nuke then test link, e.g. previous status has not sent */
+ if (!list_empty(&mReq->queue)) {
+ retval = -EBUSY;
+ err("request already in queue");
+ goto done;
+ }
+
+ if (req->length > (4 * PAGE_SIZE)) {
+ req->length = (4 * PAGE_SIZE);
+ retval = -EMSGSIZE;
+ warn("request length truncated");
+ }
+
+ dbg_queue(_usb_addr(mEp), req, retval);
+
+ /* push request */
+ mReq->req.status = -EINPROGRESS;
+ mReq->req.actual = 0;
+ list_add_tail(&mReq->queue, &mEp->qh[mEp->dir].queue);
+
+ retval = _hardware_enqueue(mEp, mReq);
+ if (retval == -EALREADY || retval == -EBUSY) {
+ dbg_event(_usb_addr(mEp), "QUEUE", retval);
+ retval = 0;
+ }
+
+ done:
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return retval;
+}
+
+/**
+ * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
+ *
+ * Check usb_ep_dequeue() at "usb_gadget.h" for details
+ */
+static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
+ unsigned long flags;
+
+ trace("%p, %p", ep, req);
+
+ if (ep == NULL || req == NULL || mEp->desc == NULL ||
+ list_empty(&mReq->queue) || list_empty(&mEp->qh[mEp->dir].queue))
+ return -EINVAL;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
+
+ if (mReq->req.status == -EALREADY)
+ _hardware_dequeue(mEp, mReq);
+
+ /* pop request */
+ list_del_init(&mReq->queue);
+ req->status = -ECONNRESET;
+
+ if (!mReq->req.no_interrupt && mReq->req.complete != NULL) {
+ spin_unlock(mEp->lock);
+ mReq->req.complete(&mEp->ep, &mReq->req);
+ spin_lock(mEp->lock);
+ }
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return 0;
+}
+
+/**
+ * ep_set_halt: sets the endpoint halt feature
+ *
+ * Check usb_ep_set_halt() at "usb_gadget.h" for details
+ */
+static int ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ int direction, retval = 0;
+ unsigned long flags;
+
+ trace("%p, %i", ep, value);
+
+ if (ep == NULL || mEp->desc == NULL)
+ return -EINVAL;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+#ifndef STALL_IN
+ /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
+ if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
+ !list_empty(&mEp->qh[mEp->dir].queue)) {
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return -EAGAIN;
+ }
+#endif
+
+ direction = mEp->dir;
+ do {
+ dbg_event(_usb_addr(mEp), "HALT", value);
+ retval |= hw_ep_set_halt(mEp->num, mEp->dir, value);
+
+ if (!value)
+ mEp->wedge = 0;
+
+ if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
+ mEp->dir = (mEp->dir == TX) ? RX : TX;
+
+ } while (mEp->dir != direction);
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+ return retval;
+}
+
+/**
+ * ep_set_wedge: sets the halt feature and ignores clear requests
+ *
+ * Check usb_ep_set_wedge() at "usb_gadget.h" for details
+ */
+static int ep_set_wedge(struct usb_ep *ep)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ unsigned long flags;
+
+ trace("%p", ep);
+
+ if (ep == NULL || mEp->desc == NULL)
+ return -EINVAL;
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ dbg_event(_usb_addr(mEp), "WEDGE", 0);
+ mEp->wedge = 1;
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+
+ return usb_ep_set_halt(ep);
+}
+
+/**
+ * ep_fifo_flush: flushes contents of a fifo
+ *
+ * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
+ */
+static void ep_fifo_flush(struct usb_ep *ep)
+{
+ struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
+ unsigned long flags;
+
+ trace("%p", ep);
+
+ if (ep == NULL) {
+ err("%02X: -EINVAL", _usb_addr(mEp));
+ return;
+ }
+
+ spin_lock_irqsave(mEp->lock, flags);
+
+ dbg_event(_usb_addr(mEp), "FFLUSH", 0);
+ hw_ep_flush(mEp->num, mEp->dir);
+
+ spin_unlock_irqrestore(mEp->lock, flags);
+}
+
+/**
+ * Endpoint-specific part of the API to the USB controller hardware
+ * Check "usb_gadget.h" for details
+ */
+static const struct usb_ep_ops usb_ep_ops = {
+ .enable = ep_enable,
+ .disable = ep_disable,
+ .alloc_request = ep_alloc_request,
+ .free_request = ep_free_request,
+ .queue = ep_queue,
+ .dequeue = ep_dequeue,
+ .set_halt = ep_set_halt,
+ .set_wedge = ep_set_wedge,
+ .fifo_flush = ep_fifo_flush,
+};
+
+/******************************************************************************
+ * GADGET block
+ *****************************************************************************/
+/**
+ * Device operations part of the API to the USB controller hardware,
+ * which don't involve endpoints (or i/o)
+ * Check "usb_gadget.h" for details
+ */
+static const struct usb_gadget_ops usb_gadget_ops;
+
+/**
+ * usb_gadget_register_driver: register a gadget driver
+ *
+ * Check usb_gadget_register_driver() at "usb_gadget.h" for details
+ * Interrupts are enabled here
+ */
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+ struct ci13xxx *udc = _udc;
+ unsigned long i, k, flags;
+ int retval = -ENOMEM;
+
+ trace("%p", driver);
+
+ if (driver == NULL ||
+ driver->bind == NULL ||
+ driver->unbind == NULL ||
+ driver->setup == NULL ||
+ driver->disconnect == NULL ||
+ driver->suspend == NULL ||
+ driver->resume == NULL)
+ return -EINVAL;
+ else if (udc == NULL)
+ return -ENODEV;
+ else if (udc->driver != NULL)
+ return -EBUSY;
+
+ /* alloc resources */
+ udc->qh_pool = dma_pool_create("ci13xxx_qh", &udc->gadget.dev,
+ sizeof(struct ci13xxx_qh),
+ 64, PAGE_SIZE);
+ if (udc->qh_pool == NULL)
+ return -ENOMEM;
+
+ udc->td_pool = dma_pool_create("ci13xxx_td", &udc->gadget.dev,
+ sizeof(struct ci13xxx_td),
+ 64, PAGE_SIZE);
+ if (udc->td_pool == NULL) {
+ dma_pool_destroy(udc->qh_pool);
+ udc->qh_pool = NULL;
+ return -ENOMEM;
+ }
+
+ spin_lock_irqsave(udc->lock, flags);
+
+ info("hw_ep_max = %d", hw_ep_max);
+
+ udc->driver = driver;
+ udc->gadget.ops = NULL;
+ udc->gadget.dev.driver = NULL;
+
+ retval = 0;
+ for (i = 0; i < hw_ep_max; i++) {
+ struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
+
+ scnprintf(mEp->name, sizeof(mEp->name), "ep%i", (int)i);
+
+ mEp->lock = udc->lock;
+ mEp->device = &udc->gadget.dev;
+ mEp->td_pool = udc->td_pool;
+
+ mEp->ep.name = mEp->name;
+ mEp->ep.ops = &usb_ep_ops;
+ mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
+
+ /* this allocation cannot be random */
+ for (k = RX; k <= TX; k++) {
+ INIT_LIST_HEAD(&mEp->qh[k].queue);
+ mEp->qh[k].ptr = dma_pool_alloc(udc->qh_pool,
+ GFP_KERNEL,
+ &mEp->qh[k].dma);
+ if (mEp->qh[k].ptr == NULL)
+ retval = -ENOMEM;
+ else
+ memset(mEp->qh[k].ptr, 0,
+ sizeof(*mEp->qh[k].ptr));
+ }
+ if (i == 0)
+ udc->gadget.ep0 = &mEp->ep;
+ else
+ list_add_tail(&mEp->ep.ep_list, &udc->gadget.ep_list);
+ }
+ if (retval)
+ goto done;
+
+ /* bind gadget */
+ driver->driver.bus = NULL;
+ udc->gadget.ops = &usb_gadget_ops;
+ udc->gadget.dev.driver = &driver->driver;
+
+ spin_unlock_irqrestore(udc->lock, flags);
+ retval = driver->bind(&udc->gadget); /* MAY SLEEP */
+ spin_lock_irqsave(udc->lock, flags);
+
+ if (retval) {
+ udc->gadget.ops = NULL;
+ udc->gadget.dev.driver = NULL;
+ goto done;
+ }
+
+ retval = hw_device_state(udc->ci13xxx_ep[0].qh[RX].dma);
+
+ done:
+ spin_unlock_irqrestore(udc->lock, flags);
+ if (retval)
+ usb_gadget_unregister_driver(driver);
+ return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+/**
+ * usb_gadget_unregister_driver: unregister a gadget driver
+ *
+ * Check usb_gadget_unregister_driver() at "usb_gadget.h" for details
+ */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+ struct ci13xxx *udc = _udc;
+ unsigned long i, k, flags;
+
+ trace("%p", driver);
+
+ if (driver == NULL ||
+ driver->bind == NULL ||
+ driver->unbind == NULL ||
+ driver->setup == NULL ||
+ driver->disconnect == NULL ||
+ driver->suspend == NULL ||
+ driver->resume == NULL ||
+ driver != udc->driver)
+ return -EINVAL;
+
+ spin_lock_irqsave(udc->lock, flags);
+
+ hw_device_state(0);
+
+ /* unbind gadget */
+ if (udc->gadget.ops != NULL) {
+ _gadget_stop_activity(&udc->gadget);
+
+ spin_unlock_irqrestore(udc->lock, flags);
+ driver->unbind(&udc->gadget); /* MAY SLEEP */
+ spin_lock_irqsave(udc->lock, flags);
+
+ udc->gadget.ops = NULL;
+ udc->gadget.dev.driver = NULL;
+ }
+
+ /* free resources */
+ for (i = 0; i < hw_ep_max; i++) {
+ struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
+
+ if (i == 0)
+ udc->gadget.ep0 = NULL;
+ else if (!list_empty(&mEp->ep.ep_list))
+ list_del_init(&mEp->ep.ep_list);
+
+ for (k = RX; k <= TX; k++)
+ if (mEp->qh[k].ptr != NULL)
+ dma_pool_free(udc->qh_pool,
+ mEp->qh[k].ptr, mEp->qh[k].dma);
+ }
+
+ udc->driver = NULL;
+
+ spin_unlock_irqrestore(udc->lock, flags);
+
+ if (udc->td_pool != NULL) {
+ dma_pool_destroy(udc->td_pool);
+ udc->td_pool = NULL;
+ }
+ if (udc->qh_pool != NULL) {
+ dma_pool_destroy(udc->qh_pool);
+ udc->qh_pool = NULL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+/******************************************************************************
+ * BUS block
+ *****************************************************************************/
+/**
+ * udc_irq: global interrupt handler
+ *
+ * This function returns IRQ_HANDLED if the IRQ has been handled
+ * It locks access to registers
+ */
+static irqreturn_t udc_irq(void)
+{
+ struct ci13xxx *udc = _udc;
+ irqreturn_t retval;
+ u32 intr;
+
+ trace();
+
+ if (udc == NULL) {
+ err("ENODEV");
+ return IRQ_HANDLED;
+ }
+
+ spin_lock(udc->lock);
+ intr = hw_test_and_clear_intr_active();
+ if (intr) {
+ isr_statistics.hndl.buf[isr_statistics.hndl.idx++] = intr;
+ isr_statistics.hndl.idx &= ISR_MASK;
+ isr_statistics.hndl.cnt++;
+
+ /* order defines priority - do NOT change it */
+ if (USBi_URI & intr) {
+ isr_statistics.uri++;
+ isr_reset_handler(udc);
+ }
+ if (USBi_PCI & intr) {
+ isr_statistics.pci++;
+ udc->gadget.speed = hw_port_is_high_speed() ?
+ USB_SPEED_HIGH : USB_SPEED_FULL;
+ }
+ if (USBi_UEI & intr)
+ isr_statistics.uei++;
+ if (USBi_UI & intr) {
+ isr_statistics.ui++;
+ isr_tr_complete_handler(udc);
+ }
+ if (USBi_SLI & intr)
+ isr_statistics.sli++;
+ retval = IRQ_HANDLED;
+ } else {
+ isr_statistics.none++;
+ retval = IRQ_NONE;
+ }
+ spin_unlock(udc->lock);
+
+ return retval;
+}
+
+/**
+ * udc_release: driver release function
+ * @dev: device
+ *
+ * Currently does nothing
+ */
+static void udc_release(struct device *dev)
+{
+ trace("%p", dev);
+
+ if (dev == NULL)
+ err("EINVAL");
+}
+
+/**
+ * udc_probe: parent probe must call this to initialize UDC
+ * @dev: parent device
+ * @regs: registers base address
+ * @name: driver name
+ *
+ * This function returns an error code
+ * No interrupts active, the IRQ has not been requested yet
+ * Kernel assumes 32-bit DMA operations by default, no need to dma_set_mask
+ */
+static int udc_probe(struct device *dev, void __iomem *regs, const char *name)
+{
+ struct ci13xxx *udc;
+ int retval = 0;
+
+ trace("%p, %p, %p", dev, regs, name);
+
+ if (dev == NULL || regs == NULL || name == NULL)
+ return -EINVAL;
+
+ udc = kzalloc(sizeof(struct ci13xxx), GFP_KERNEL);
+ if (udc == NULL)
+ return -ENOMEM;
+
+ udc->lock = &udc_lock;
+
+ retval = hw_device_reset(regs);
+ if (retval)
+ goto done;
+
+ udc->gadget.ops = NULL;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->gadget.is_dualspeed = 1;
+ udc->gadget.is_otg = 0;
+ udc->gadget.name = name;
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+ udc->gadget.ep0 = NULL;
+
+ strcpy(udc->gadget.dev.bus_id, "gadget");
+ udc->gadget.dev.dma_mask = dev->dma_mask;
+ udc->gadget.dev.parent = dev;
+ udc->gadget.dev.release = udc_release;
+
+ retval = device_register(&udc->gadget.dev);
+ if (retval)
+ goto done;
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+ retval = dbg_create_files(&udc->gadget.dev);
+#endif
+ if (retval) {
+ device_unregister(&udc->gadget.dev);
+ goto done;
+ }
+
+ _udc = udc;
+ return retval;
+
+ done:
+ err("error = %i", retval);
+ kfree(udc);
+ _udc = NULL;
+ return retval;
+}
+
+/**
+ * udc_remove: parent remove must call this to remove UDC
+ *
+ * No interrupts active, the IRQ has been released
+ */
+static void udc_remove(void)
+{
+ struct ci13xxx *udc = _udc;
+
+ if (udc == NULL) {
+ err("EINVAL");
+ return;
+ }
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+ dbg_remove_files(&udc->gadget.dev);
+#endif
+ device_unregister(&udc->gadget.dev);
+
+ kfree(udc);
+ _udc = NULL;
+}
+
+/******************************************************************************
+ * PCI block
+ *****************************************************************************/
+/**
+ * ci13xxx_pci_irq: interrut handler
+ * @irq: irq number
+ * @pdev: USB Device Controller interrupt source
+ *
+ * This function returns IRQ_HANDLED if the IRQ has been handled
+ * This is an ISR don't trace, use attribute interface instead
+ */
+static irqreturn_t ci13xxx_pci_irq(int irq, void *pdev)
+{
+ if (irq == 0) {
+ dev_err(&((struct pci_dev *)pdev)->dev, "Invalid IRQ0 usage!");
+ return IRQ_HANDLED;
+ }
+ return udc_irq();
+}
+
+/**
+ * ci13xxx_pci_probe: PCI probe
+ * @pdev: USB device controller being probed
+ * @id: PCI hotplug ID connecting controller to UDC framework
+ *
+ * This function returns an error code
+ * Allocates basic PCI resources for this USB device controller, and then
+ * invokes the udc_probe() method to start the UDC associated with it
+ */
+static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ void __iomem *regs = NULL;
+ int retval = 0;
+
+ if (id == NULL)
+ return -EINVAL;
+
+ retval = pci_enable_device(pdev);
+ if (retval)
+ goto done;
+
+ if (!pdev->irq) {
+ dev_err(&pdev->dev, "No IRQ, check BIOS/PCI setup!");
+ retval = -ENODEV;
+ goto disable_device;
+ }
+
+ retval = pci_request_regions(pdev, UDC_DRIVER_NAME);
+ if (retval)
+ goto disable_device;
+
+ /* BAR 0 holds all the registers */
+ regs = pci_iomap(pdev, 0, 0);
+ if (!regs) {
+ dev_err(&pdev->dev, "Error mapping memory!");
+ retval = -EFAULT;
+ goto release_regions;
+ }
+ pci_set_drvdata(pdev, (__force void *)regs);
+
+ pci_set_master(pdev);
+ pci_try_set_mwi(pdev);
+
+ retval = udc_probe(&pdev->dev, regs, UDC_DRIVER_NAME);
+ if (retval)
+ goto iounmap;
+
+ /* our device does not have MSI capability */
+
+ retval = request_irq(pdev->irq, ci13xxx_pci_irq, IRQF_SHARED,
+ UDC_DRIVER_NAME, pdev);
+ if (retval)
+ goto gadget_remove;
+
+ return 0;
+
+ gadget_remove:
+ udc_remove();
+ iounmap:
+ pci_iounmap(pdev, regs);
+ release_regions:
+ pci_release_regions(pdev);
+ disable_device:
+ pci_disable_device(pdev);
+ done:
+ return retval;
+}
+
+/**
+ * ci13xxx_pci_remove: PCI remove
+ * @pdev: USB Device Controller being removed
+ *
+ * Reverses the effect of ci13xxx_pci_probe(),
+ * first invoking the udc_remove() and then releases
+ * all PCI resources allocated for this USB device controller
+ */
+static void __devexit ci13xxx_pci_remove(struct pci_dev *pdev)
+{
+ free_irq(pdev->irq, pdev);
+ udc_remove();
+ pci_iounmap(pdev, (__force void __iomem *)pci_get_drvdata(pdev));
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+}
+
+/**
+ * PCI device table
+ * PCI device structure
+ *
+ * Check "pci.h" for details
+ */
+static DEFINE_PCI_DEVICE_TABLE(ci13xxx_pci_id_table) = {
+ { PCI_DEVICE(0x153F, 0x1004) },
+ { PCI_DEVICE(0x153F, 0x1006) },
+ { 0, 0, 0, 0, 0, 0, 0 /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, ci13xxx_pci_id_table);
+
+static struct pci_driver ci13xxx_pci_driver = {
+ .name = UDC_DRIVER_NAME,
+ .id_table = ci13xxx_pci_id_table,
+ .probe = ci13xxx_pci_probe,
+ .remove = __devexit_p(ci13xxx_pci_remove),
+};
+
+/**
+ * ci13xxx_pci_init: module init
+ *
+ * Driver load
+ */
+static int __init ci13xxx_pci_init(void)
+{
+ return pci_register_driver(&ci13xxx_pci_driver);
+}
+module_init(ci13xxx_pci_init);
+
+/**
+ * ci13xxx_pci_exit: module exit
+ *
+ * Driver unload
+ */
+static void __exit ci13xxx_pci_exit(void)
+{
+ pci_unregister_driver(&ci13xxx_pci_driver);
+}
+module_exit(ci13xxx_pci_exit);
+
+MODULE_AUTHOR("MIPS - David Lopo <dlopo@chipidea.mips.com>");
+MODULE_DESCRIPTION("MIPS CI13XXX USB Peripheral Controller");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("June 2008");
projects / platform / kernel / linux-exynos.git / commitdiff