diff options
Diffstat (limited to 'drivers/usb/gadget/ci13xxx_udc.c')
| -rw-r--r-- | drivers/usb/gadget/ci13xxx_udc.c | 2830 |
1 files changed, 2830 insertions, 0 deletions
diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c new file mode 100644 index 00000000000..bebf911c7e5 --- /dev/null +++ b/drivers/usb/gadget/ci13xxx_udc.c @@ -0,0 +1,2830 @@ +/* + * 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"); |