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linux/drivers/usb/musb/musb_core.h
Paul Cercueil a6d45ea063 usb: musb: Allow running without CONFIG_USB_PHY 
Modify the core so that musb->xceiv is never deferenced without being
checked first.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20221026182657.146630-4-paul@crapouillou.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-09 12:39:13 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* MUSB OTG driver defines
*
* Copyright 2005 Mentor Graphics Corporation
* Copyright (C) 2005-2006 by Texas Instruments
* Copyright (C) 2006-2007 Nokia Corporation
*/
#ifndef __MUSB_CORE_H__
#define __MUSB_CORE_H__
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/musb.h>
#include <linux/phy/phy.h>
#include <linux/workqueue.h>
struct musb;
struct musb_hw_ep;
struct musb_ep;
struct musb_qh;
/* Helper defines for struct musb->hwvers */
#define MUSB_HWVERS_MAJOR(x) ((x >> 10) & 0x1f)
#define MUSB_HWVERS_MINOR(x) (x & 0x3ff)
#define MUSB_HWVERS_RC 0x8000
#define MUSB_HWVERS_1300 0x52C
#define MUSB_HWVERS_1400 0x590
#define MUSB_HWVERS_1800 0x720
#define MUSB_HWVERS_1900 0x784
#define MUSB_HWVERS_2000 0x800
#include "musb_debug.h"
#include "musb_dma.h"
#include "musb_io.h"
#include "musb_gadget.h"
#include <linux/usb/hcd.h>
#include "musb_host.h"
/* NOTE: otg and peripheral-only state machines start at B_IDLE.
* OTG or host-only go to A_IDLE when ID is sensed.
*/
#define is_peripheral_active(m) (!(m)->is_host)
#define is_host_active(m) ((m)->is_host)
/****************************** CONSTANTS ********************************/
#ifndef MUSB_C_NUM_EPS
#define MUSB_C_NUM_EPS ((u8)16)
#endif
#ifndef MUSB_MAX_END0_PACKET
#define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
#endif
/* host side ep0 states */
enum musb_h_ep0_state {
MUSB_EP0_IDLE,
MUSB_EP0_START, /* expect ack of setup */
MUSB_EP0_IN, /* expect IN DATA */
MUSB_EP0_OUT, /* expect ack of OUT DATA */
MUSB_EP0_STATUS, /* expect ack of STATUS */
} __attribute__ ((packed));
/* peripheral side ep0 states */
enum musb_g_ep0_state {
MUSB_EP0_STAGE_IDLE, /* idle, waiting for SETUP */
MUSB_EP0_STAGE_SETUP, /* received SETUP */
MUSB_EP0_STAGE_TX, /* IN data */
MUSB_EP0_STAGE_RX, /* OUT data */
MUSB_EP0_STAGE_STATUSIN, /* (after OUT data) */
MUSB_EP0_STAGE_STATUSOUT, /* (after IN data) */
MUSB_EP0_STAGE_ACKWAIT, /* after zlp, before statusin */
} __attribute__ ((packed));
/*
* OTG protocol constants. See USB OTG 1.3 spec,
* sections 5.5 "Device Timings" and 6.6.5 "Timers".
*/
#define OTG_TIME_A_WAIT_VRISE 100 /* msec (max) */
#define OTG_TIME_A_WAIT_BCON 1100 /* min 1 second */
#define OTG_TIME_A_AIDL_BDIS 200 /* min 200 msec */
#define OTG_TIME_B_ASE0_BRST 100 /* min 3.125 ms */
/****************************** FUNCTIONS ********************************/
#define MUSB_HST_MODE(_musb)\
{ (_musb)->is_host = true; }
#define MUSB_DEV_MODE(_musb) \
{ (_musb)->is_host = false; }
#define test_devctl_hst_mode(_x) \
(musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
#define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
/******************************** TYPES *************************************/
struct musb_io;
/**
* struct musb_platform_ops - Operations passed to musb_core by HW glue layer
* @quirks: flags for platform specific quirks
* @enable: enable device
* @disable: disable device
* @ep_offset: returns the end point offset
* @ep_select: selects the specified end point
* @fifo_mode: sets the fifo mode
* @fifo_offset: returns the fifo offset
* @readb: read 8 bits
* @writeb: write 8 bits
* @clearb: could be clear-on-readb or W1C
* @readw: read 16 bits
* @writew: write 16 bits
* @clearw: could be clear-on-readw or W1C
* @read_fifo: reads the fifo
* @write_fifo: writes to fifo
* @get_toggle: platform specific get toggle function
* @set_toggle: platform specific set toggle function
* @dma_init: platform specific dma init function
* @dma_exit: platform specific dma exit function
* @init: turns on clocks, sets up platform-specific registers, etc
* @exit: undoes @init
* @set_mode: forcefully changes operating mode
* @try_idle: tries to idle the IP
* @recover: platform-specific babble recovery
* @vbus_status: returns vbus status if possible
* @set_vbus: forces vbus status
* @pre_root_reset_end: called before the root usb port reset flag gets cleared
* @post_root_reset_end: called after the root usb port reset flag gets cleared
* @phy_callback: optional callback function for the phy to call
*/
struct musb_platform_ops {
#define MUSB_G_NO_SKB_RESERVE BIT(9)
#define MUSB_DA8XX BIT(8)
#define MUSB_PRESERVE_SESSION BIT(7)
#define MUSB_DMA_UX500 BIT(6)
#define MUSB_DMA_CPPI41 BIT(5)
#define MUSB_DMA_CPPI BIT(4)
#define MUSB_DMA_TUSB_OMAP BIT(3)
#define MUSB_DMA_INVENTRA BIT(2)
#define MUSB_IN_TUSB BIT(1)
#define MUSB_INDEXED_EP BIT(0)
u32 quirks;
int (*init)(struct musb *musb);
int (*exit)(struct musb *musb);
void (*enable)(struct musb *musb);
void (*disable)(struct musb *musb);
u32 (*ep_offset)(u8 epnum, u16 offset);
void (*ep_select)(void __iomem *mbase, u8 epnum);
u16 fifo_mode;
u32 (*fifo_offset)(u8 epnum);
u32 (*busctl_offset)(u8 epnum, u16 offset);
u8 (*readb)(void __iomem *addr, u32 offset);
void (*writeb)(void __iomem *addr, u32 offset, u8 data);
u8 (*clearb)(void __iomem *addr, u32 offset);
u16 (*readw)(void __iomem *addr, u32 offset);
void (*writew)(void __iomem *addr, u32 offset, u16 data);
u16 (*clearw)(void __iomem *addr, u32 offset);
void (*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
void (*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
u16 (*get_toggle)(struct musb_qh *qh, int is_out);
u16 (*set_toggle)(struct musb_qh *qh, int is_out, struct urb *urb);
struct dma_controller *
(*dma_init) (struct musb *musb, void __iomem *base);
void (*dma_exit)(struct dma_controller *c);
int (*set_mode)(struct musb *musb, u8 mode);
void (*try_idle)(struct musb *musb, unsigned long timeout);
int (*recover)(struct musb *musb);
int (*vbus_status)(struct musb *musb);
void (*set_vbus)(struct musb *musb, int on);
void (*pre_root_reset_end)(struct musb *musb);
void (*post_root_reset_end)(struct musb *musb);
int (*phy_callback)(enum musb_vbus_id_status status);
void (*clear_ep_rxintr)(struct musb *musb, int epnum);
};
/*
* struct musb_hw_ep - endpoint hardware (bidirectional)
*
* Ordered slightly for better cacheline locality.
*/
struct musb_hw_ep {
struct musb *musb;
void __iomem *fifo;
void __iomem *regs;
#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
void __iomem *conf;
#endif
/* index in musb->endpoints[] */
u8 epnum;
/* hardware configuration, possibly dynamic */
bool is_shared_fifo;
bool tx_double_buffered;
bool rx_double_buffered;
u16 max_packet_sz_tx;
u16 max_packet_sz_rx;
struct dma_channel *tx_channel;
struct dma_channel *rx_channel;
#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
/* TUSB has "asynchronous" and "synchronous" dma modes */
dma_addr_t fifo_async;
dma_addr_t fifo_sync;
void __iomem *fifo_sync_va;
#endif
/* currently scheduled peripheral endpoint */
struct musb_qh *in_qh;
struct musb_qh *out_qh;
u8 rx_reinit;
u8 tx_reinit;
/* peripheral side */
struct musb_ep ep_in; /* TX */
struct musb_ep ep_out; /* RX */
};
static inline struct musb_request *next_in_request(struct musb_hw_ep *hw_ep)
{
return next_request(&hw_ep->ep_in);
}
static inline struct musb_request *next_out_request(struct musb_hw_ep *hw_ep)
{
return next_request(&hw_ep->ep_out);
}
struct musb_csr_regs {
/* FIFO registers */
u16 txmaxp, txcsr, rxmaxp, rxcsr;
u16 rxfifoadd, txfifoadd;
u8 txtype, txinterval, rxtype, rxinterval;
u8 rxfifosz, txfifosz;
u8 txfunaddr, txhubaddr, txhubport;
u8 rxfunaddr, rxhubaddr, rxhubport;
};
struct musb_context_registers {
u8 power;
u8 intrusbe;
u16 frame;
u8 index, testmode;
u8 devctl, busctl, misc;
u32 otg_interfsel;
struct musb_csr_regs index_regs[MUSB_C_NUM_EPS];
};
/*
* struct musb - Driver instance data.
*/
struct musb {
/* device lock */
spinlock_t lock;
spinlock_t list_lock; /* resume work list lock */
struct musb_io io;
const struct musb_platform_ops *ops;
struct musb_context_registers context;
irqreturn_t (*isr)(int, void *);
struct delayed_work irq_work;
struct delayed_work deassert_reset_work;
struct delayed_work finish_resume_work;
struct delayed_work gadget_work;
u16 hwvers;
u16 intrrxe;
u16 intrtxe;
/* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
#define MUSB_PORT_STAT_RESUME (1 << 31)
u32 port1_status;
unsigned long rh_timer;
enum musb_h_ep0_state ep0_stage;
/* bulk traffic normally dedicates endpoint hardware, and each
* direction has its own ring of host side endpoints.
* we try to progress the transfer at the head of each endpoint's
* queue until it completes or NAKs too much; then we try the next
* endpoint.
*/
struct musb_hw_ep *bulk_ep;
struct list_head control; /* of musb_qh */
struct list_head in_bulk; /* of musb_qh */
struct list_head out_bulk; /* of musb_qh */
struct list_head pending_list; /* pending work list */
struct timer_list otg_timer;
struct timer_list dev_timer;
struct notifier_block nb;
struct dma_controller *dma_controller;
struct device *controller;
void __iomem *ctrl_base;
void __iomem *mregs;
#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
dma_addr_t async;
dma_addr_t sync;
void __iomem *sync_va;
u8 tusb_revision;
#endif
/* passed down from chip/board specific irq handlers */
u8 int_usb;
u16 int_rx;
u16 int_tx;
struct usb_phy *xceiv;
struct phy *phy;
enum usb_otg_state otg_state;
int nIrq;
unsigned irq_wake:1;
struct musb_hw_ep endpoints[MUSB_C_NUM_EPS];
#define control_ep endpoints
#define VBUSERR_RETRY_COUNT 3
u16 vbuserr_retry;
u16 epmask;
u8 nr_endpoints;
int (*board_set_power)(int state);
u8 min_power; /* vbus for periph, in mA/2 */
enum musb_mode port_mode;
bool session;
unsigned long quirk_retries;
bool is_host;
int a_wait_bcon; /* VBUS timeout in msecs */
unsigned long idle_timeout; /* Next timeout in jiffies */
unsigned is_initialized:1;
unsigned is_runtime_suspended:1;
/* active means connected and not suspended */
unsigned is_active:1;
unsigned is_multipoint:1;
unsigned hb_iso_rx:1; /* high bandwidth iso rx? */
unsigned hb_iso_tx:1; /* high bandwidth iso tx? */
unsigned dyn_fifo:1; /* dynamic FIFO supported? */
unsigned bulk_split:1;
#define can_bulk_split(musb, type) \
(((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
unsigned bulk_combine:1;
#define can_bulk_combine(musb, type) \
(((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
/* is_suspended means USB B_PERIPHERAL suspend */
unsigned is_suspended:1;
/* may_wakeup means remote wakeup is enabled */
unsigned may_wakeup:1;
/* is_self_powered is reported in device status and the
* config descriptor. is_bus_powered means B_PERIPHERAL
* draws some VBUS current; both can be true.
*/
unsigned is_self_powered:1;
unsigned is_bus_powered:1;
unsigned set_address:1;
unsigned test_mode:1;
unsigned softconnect:1;
unsigned flush_irq_work:1;
u8 address;
u8 test_mode_nr;
u16 ackpend; /* ep0 */
enum musb_g_ep0_state ep0_state;
struct usb_gadget g; /* the gadget */
struct usb_gadget_driver *gadget_driver; /* its driver */
struct usb_hcd *hcd; /* the usb hcd */
const struct musb_hdrc_config *config;
int xceiv_old_state;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_root;
#endif
};
/* This must be included after struct musb is defined */
#include "musb_regs.h"
static inline struct musb *gadget_to_musb(struct usb_gadget *g)
{
return container_of(g, struct musb, g);
}
static inline char *musb_ep_xfertype_string(u8 type)
{
char *s;
switch (type) {
case USB_ENDPOINT_XFER_CONTROL:
s = "ctrl";
break;
case USB_ENDPOINT_XFER_ISOC:
s = "iso";
break;
case USB_ENDPOINT_XFER_BULK:
s = "bulk";
break;
case USB_ENDPOINT_XFER_INT:
s = "int";
break;
default:
s = "";
break;
}
return s;
}
static inline int musb_read_fifosize(struct musb *musb,
struct musb_hw_ep *hw_ep, u8 epnum)
{
void __iomem *mbase = musb->mregs;
u8 reg = 0;
/* read from core using indexed model */
reg = musb_readb(mbase, musb->io.ep_offset(epnum, MUSB_FIFOSIZE));
/* 0's returned when no more endpoints */
if (!reg)
return -ENODEV;
musb->nr_endpoints++;
musb->epmask |= (1 << epnum);
hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);
/* shared TX/RX FIFO? */
if ((reg & 0xf0) == 0xf0) {
hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
hw_ep->is_shared_fifo = true;
return 0;
} else {
hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
hw_ep->is_shared_fifo = false;
}
return 0;
}
static inline void musb_configure_ep0(struct musb *musb)
{
musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
musb->endpoints[0].is_shared_fifo = true;
}
/***************************** Glue it together *****************************/
extern const char musb_driver_name[];
extern void musb_stop(struct musb *musb);
extern void musb_start(struct musb *musb);
extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
extern int musb_set_host(struct musb *musb);
extern int musb_set_peripheral(struct musb *musb);
extern void musb_load_testpacket(struct musb *);
extern irqreturn_t musb_interrupt(struct musb *);
extern void musb_hnp_stop(struct musb *musb);
int musb_queue_resume_work(struct musb *musb,
int (*callback)(struct musb *musb, void *data),
void *data);
static inline void musb_platform_set_vbus(struct musb *musb, int is_on)
{
if (musb->ops->set_vbus)
musb->ops->set_vbus(musb, is_on);
}
static inline void musb_platform_enable(struct musb *musb)
{
if (musb->ops->enable)
musb->ops->enable(musb);
}
static inline void musb_platform_disable(struct musb *musb)
{
if (musb->ops->disable)
musb->ops->disable(musb);
}
static inline int musb_platform_set_mode(struct musb *musb, u8 mode)
{
if (!musb->ops->set_mode)
return 0;
return musb->ops->set_mode(musb, mode);
}
static inline void musb_platform_try_idle(struct musb *musb,
unsigned long timeout)
{
if (musb->ops->try_idle)
musb->ops->try_idle(musb, timeout);
}
static inline int musb_platform_recover(struct musb *musb)
{
if (!musb->ops->recover)
return 0;
return musb->ops->recover(musb);
}
static inline int musb_platform_get_vbus_status(struct musb *musb)
{
if (!musb->ops->vbus_status)
return -EINVAL;
return musb->ops->vbus_status(musb);
}
static inline int musb_platform_init(struct musb *musb)
{
if (!musb->ops->init)
return -EINVAL;
return musb->ops->init(musb);
}
static inline int musb_platform_exit(struct musb *musb)
{
if (!musb->ops->exit)
return -EINVAL;
return musb->ops->exit(musb);
}
static inline void musb_platform_pre_root_reset_end(struct musb *musb)
{
if (musb->ops->pre_root_reset_end)
musb->ops->pre_root_reset_end(musb);
}
static inline void musb_platform_post_root_reset_end(struct musb *musb)
{
if (musb->ops->post_root_reset_end)
musb->ops->post_root_reset_end(musb);
}
static inline void musb_platform_clear_ep_rxintr(struct musb *musb, int epnum)
{
if (musb->ops->clear_ep_rxintr)
musb->ops->clear_ep_rxintr(musb, epnum);
}
static inline void musb_set_state(struct musb *musb,
enum usb_otg_state otg_state)
{
if (musb->xceiv)
musb->xceiv->otg->state = otg_state;
else
musb->otg_state = otg_state;
}
static inline enum usb_otg_state musb_get_state(struct musb *musb)
{
if (musb->xceiv)
return musb->xceiv->otg->state;
return musb->otg_state;
}
static inline const char *musb_otg_state_string(struct musb *musb)
{
return usb_otg_state_string(musb_get_state(musb));
}
/*
* gets the "dr_mode" property from DT and converts it into musb_mode
* if the property is not found or not recognized returns MUSB_OTG
*/
extern enum musb_mode musb_get_mode(struct device *dev);
#endif /* __MUSB_CORE_H__ */
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