// SPDX-License-Identifier: GPL-2.0+
/*
* NetChip 2280 high / full speed USB device controller .
* Unlike many such controllers , this one talks PCI .
*/
/*
* Copyright ( C ) 2002 NetChip Technology , Inc . ( http : //www.netchip.com)
* Copyright ( C ) 2003 David Brownell
* Copyright ( C ) 2014 Ricardo Ribalda - Qtechnology / AS
*/
#include <linux/usb/net2280.h>
#include <linux/usb/usb338x.h>
/*-------------------------------------------------------------------------*/
#ifdef __KERNEL__
/* indexed registers [11.10] are accessed indirectly
* caller must own the device lock .
*/
static inline u32 get_idx_reg(struct net2280_regs __iomem *regs, u32 index)
{
writel(index, ®s->idxaddr);
/* NOTE: synchs device/cpu memory views */
return readl(®s->idxdata);
}
static inline void
set_idx_reg(struct net2280_regs __iomem *regs, u32 index, u32 value)
{
writel(index, ®s->idxaddr);
writel(value, ®s->idxdata);
/* posted, may not be visible yet */
}
#endif /* __KERNEL__ */
#define PCI_VENDOR_ID_PLX_LEGACY 0 x17cc
#define PLX_LEGACY BIT(0 )
#define PLX_2280 BIT(1 )
#define PLX_SUPERSPEED BIT(2 )
#define PLX_PCIE BIT(3 )
#define REG_DIAG 0 x0
#define RETRY_COUNTER 16
#define FORCE_PCI_SERR 11
#define FORCE_PCI_INTERRUPT 10
#define FORCE_USB_INTERRUPT 9
#define FORCE_CPU_INTERRUPT 8
#define ILLEGAL_BYTE_ENABLES 5
#define FAST_TIMES 4
#define FORCE_RECEIVE_ERROR 2
#define FORCE_TRANSMIT_CRC_ERROR 0
#define REG_FRAME 0 x02 /* from last sof */
#define REG_CHIPREV 0 x03 /* in bcd */
#define REG_HS_NAK_RATE 0 x0a /* NAK per N uframes */
#define CHIPREV_1 0 x0100
#define CHIPREV_1A 0 x0110
/* DEFECT 7374 */
#define DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS 200
#define DEFECT_7374_PROCESSOR_WAIT_TIME 10
/* ep0 max packet size */
#define EP0_SS_MAX_PACKET_SIZE 0 x200
#define EP0_HS_MAX_PACKET_SIZE 0 x40
#ifdef __KERNEL__
/*-------------------------------------------------------------------------*/
/* [8.3] for scatter/gather i/o
* use struct net2280_dma_regs bitfields
*/
struct net2280_dma {
__le32 dmacount;
__le32 dmaaddr; /* the buffer */
__le32 dmadesc; /* next dma descriptor */
__le32 _reserved;
} __aligned(16 );
/*-------------------------------------------------------------------------*/
/* DRIVER DATA STRUCTURES and UTILITIES */
struct net2280_ep {
struct usb_ep ep;
struct net2280_ep_regs __iomem *cfg;
struct net2280_ep_regs __iomem *regs;
struct net2280_dma_regs __iomem *dma;
struct net2280_dma *dummy;
dma_addr_t td_dma; /* of dummy */
struct net2280 *dev;
unsigned long irqs;
/* analogous to a host-side qh */
struct list_head queue;
const struct usb_endpoint_descriptor *desc;
unsigned num : 8 ,
fifo_size : 12 ,
in_fifo_validate : 1 ,
out_overflow : 1 ,
stopped : 1 ,
wedged : 1 ,
is_in : 1 ,
is_iso : 1 ,
responded : 1 ;
};
static inline void allow_status(struct net2280_ep *ep)
{
/* ep0 only */
writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
BIT(CLEAR_NAK_OUT_PACKETS) |
BIT(CLEAR_NAK_OUT_PACKETS_MODE),
&ep->regs->ep_rsp);
ep->stopped = 1 ;
}
static inline void allow_status_338x(struct net2280_ep *ep)
{
/*
* Control Status Phase Handshake was set by the chip when the setup
* packet arrived . While set , the chip automatically NAKs the host ' s
* Status Phase tokens .
*/
writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), &ep->regs->ep_rsp);
ep->stopped = 1 ;
/* TD 9.9 Halt Endpoint test. TD 9.22 set feature test. */
ep->responded = 0 ;
}
struct net2280_request {
struct usb_request req;
struct net2280_dma *td;
dma_addr_t td_dma;
struct list_head queue;
unsigned mapped : 1 ,
valid : 1 ;
};
struct net2280 {
/* each pci device provides one gadget, several endpoints */
struct usb_gadget gadget;
spinlock_t lock;
struct net2280_ep ep[9 ];
struct usb_gadget_driver *driver;
unsigned enabled : 1 ,
protocol_stall : 1 ,
softconnect : 1 ,
got_irq : 1 ,
region:1 ,
added:1 ,
u1_enable:1 ,
u2_enable:1 ,
ltm_enable:1 ,
wakeup_enable:1 ,
addressed_state:1 ,
async_callbacks:1 ,
bug7734_patched:1 ;
u16 chiprev;
int enhanced_mode;
int n_ep;
kernel_ulong_t quirks;
/* pci state used to access those endpoints */
struct pci_dev *pdev;
struct net2280_regs __iomem *regs;
struct net2280_usb_regs __iomem *usb;
struct usb338x_usb_ext_regs __iomem *usb_ext;
struct net2280_pci_regs __iomem *pci;
struct net2280_dma_regs __iomem *dma;
struct net2280_dep_regs __iomem *dep;
struct net2280_ep_regs __iomem *epregs;
struct usb338x_ll_regs __iomem *llregs;
struct usb338x_pl_regs __iomem *plregs;
struct dma_pool *requests;
/* statistics...*/
};
static inline void set_halt(struct net2280_ep *ep)
{
/* ep0 and bulk/intr endpoints */
writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
/* set NAK_OUT for erratum 0114 */
((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS) |
BIT(SET_ENDPOINT_HALT),
&ep->regs->ep_rsp);
}
static inline void clear_halt(struct net2280_ep *ep)
{
/* ep0 and bulk/intr endpoints */
writel(BIT(CLEAR_ENDPOINT_HALT) |
BIT(CLEAR_ENDPOINT_TOGGLE) |
/*
* unless the gadget driver left a short packet in the
* fifo , this reverses the erratum 0114 workaround .
*/
((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS),
&ep->regs->ep_rsp);
}
/*
* FSM value for Defect 7374 ( U1U2 Test ) is managed in
* chip ' s SCRATCH register :
*/
#define DEFECT7374_FSM_FIELD 28
/* Waiting for Control Read:
* - A transition to this state indicates a fresh USB connection ,
* before the first Setup Packet . The connection speed is not
* known . Firmware is waiting for the first Control Read .
* - Starting state : This state can be thought of as the FSM ' s typical
* starting state .
* - Tip : Upon the first SS Control Read the FSM never
* returns to this state .
*/
#define DEFECT7374_FSM_WAITING_FOR_CONTROL_READ BIT(DEFECT7374_FSM_FIELD)
/* Non-SS Control Read:
* - A transition to this state indicates detection of the first HS
* or FS Control Read .
* - Tip : Upon the first SS Control Read the FSM never
* returns to this state .
*/
#define DEFECT7374_FSM_NON_SS_CONTROL_READ (2 << DEFECT7374_FSM_FIELD)
/* SS Control Read:
* - A transition to this state indicates detection of the
* first SS Control Read .
* - This state indicates workaround completion . Workarounds no longer
* need to be applied ( as long as the chip remains powered up ) .
* - Tip : Once in this state the FSM state does not change ( until
* the chip ' s power is lost and restored ) .
* - This can be thought of as the final state of the FSM ;
* the FSM ' locks - up ' in this state until the chip loses power .
*/
#define DEFECT7374_FSM_SS_CONTROL_READ (3 << DEFECT7374_FSM_FIELD)
#ifdef USE_RDK_LEDS
static inline void net2280_led_init(struct net2280 *dev)
{
/* LED3 (green) is on during USB activity. note erratum 0113. */
writel(BIT(GPIO3_LED_SELECT) |
BIT(GPIO3_OUTPUT_ENABLE) |
BIT(GPIO2_OUTPUT_ENABLE) |
BIT(GPIO1_OUTPUT_ENABLE) |
BIT(GPIO0_OUTPUT_ENABLE),
&dev->regs->gpioctl);
}
/* indicate speed with bi-color LED 0/1 */
static inline
void net2280_led_speed(struct net2280 *dev, enum usb_device_speed speed)
{
u32 val = readl(&dev->regs->gpioctl);
switch (speed) {
case USB_SPEED_SUPER: /* green + red */
val |= BIT(GPIO0_DATA) | BIT(GPIO1_DATA);
break ;
case USB_SPEED_HIGH: /* green */
val &= ~BIT(GPIO0_DATA);
val |= BIT(GPIO1_DATA);
break ;
case USB_SPEED_FULL: /* red */
val &= ~BIT(GPIO1_DATA);
val |= BIT(GPIO0_DATA);
break ;
default : /* (off/black) */
val &= ~(BIT(GPIO1_DATA) | BIT(GPIO0_DATA));
break ;
}
writel(val, &dev->regs->gpioctl);
}
/* indicate power with LED 2 */
static inline void net2280_led_active(struct net2280 *dev, int is_active)
{
u32 val = readl(&dev->regs->gpioctl);
/* FIXME this LED never seems to turn on.*/
if (is_active)
val |= GPIO2_DATA;
else
val &= ~GPIO2_DATA;
writel(val, &dev->regs->gpioctl);
}
static inline void net2280_led_shutdown(struct net2280 *dev)
{
/* turn off all four GPIO*_DATA bits */
writel(readl(&dev->regs->gpioctl) & ~0 x0f,
&dev->regs->gpioctl);
}
#else
#define net2280_led_init(dev) do { } while (0 )
#define net2280_led_speed(dev, speed) do { } while (0 )
#define net2280_led_shutdown(dev) do { } while (0 )
#endif
/*-------------------------------------------------------------------------*/
#define ep_dbg(ndev, fmt, args...) \
dev_dbg((&((ndev)->pdev->dev)), fmt, ## args)
#define ep_vdbg(ndev, fmt, args...) \
dev_vdbg((&((ndev)->pdev->dev)), fmt, ## args)
#define ep_info(ndev, fmt, args...) \
dev_info((&((ndev)->pdev->dev)), fmt, ## args)
#define ep_warn(ndev, fmt, args...) \
dev_warn((&((ndev)->pdev->dev)), fmt, ## args)
#define ep_err(ndev, fmt, args...) \
dev_err((&((ndev)->pdev->dev)), fmt, ## args)
/*-------------------------------------------------------------------------*/
static inline void set_fifo_bytecount(struct net2280_ep *ep, unsigned count)
{
if (ep->dev->pdev->vendor == 0 x17cc)
writeb(count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
else {
u32 tmp = readl(&ep->cfg->ep_cfg) &
(~(0 x07 << EP_FIFO_BYTE_COUNT));
writel(tmp | (count << EP_FIFO_BYTE_COUNT), &ep->cfg->ep_cfg);
}
}
static inline void start_out_naking(struct net2280_ep *ep)
{
/* NOTE: hardware races lurk here, and PING protocol issues */
writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
/* synch with device */
readl(&ep->regs->ep_rsp);
}
static inline void stop_out_naking(struct net2280_ep *ep)
{
u32 tmp;
tmp = readl(&ep->regs->ep_stat);
if ((tmp & BIT(NAK_OUT_PACKETS)) != 0 )
writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
}
static inline void set_max_speed(struct net2280_ep *ep, u32 max)
{
u32 reg;
static const u32 ep_enhanced[9 ] = { 0 x10, 0 x60, 0 x30, 0 x80,
0 x50, 0 x20, 0 x70, 0 x40, 0 x90 };
if (ep->dev->enhanced_mode) {
reg = ep_enhanced[ep->num];
switch (ep->dev->gadget.speed) {
case USB_SPEED_SUPER:
reg += 2 ;
break ;
case USB_SPEED_FULL:
reg += 1 ;
break ;
case USB_SPEED_HIGH:
default :
break ;
}
} else {
reg = (ep->num + 1 ) * 0 x10;
if (ep->dev->gadget.speed != USB_SPEED_HIGH)
reg += 1 ;
}
set_idx_reg(ep->dev->regs, reg, max);
}
#endif /* __KERNEL__ */
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