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// SPDX-License-Identifier: GPL-2.0+
/*
* USB Peripheral Controller driver for Aeroflex Gaisler GRUSBDC.
*
* 2013 (c) Aeroflex Gaisler AB
*
* This driver supports GRUSBDC USB Device Controller cores available in the
* GRLIB VHDL IP core library.
*
* Full documentation of the GRUSBDC core can be found here:
* https://www.gaisler.com/products/grlib/grip.pdf
*
* Contributors:
* - Andreas Larsson <andreas@gaisler.com>
* - Marko Isomaki
*/
/* Control registers on the AMBA bus */
#define GR_MAXEP 16 /* Max # endpoints for *each* direction */
struct gr_epregs {
u32 epctrl;
union {
struct { /* Slave mode*/
u32 slvctrl;
u32 slvdata;
};
struct { /* DMA mode*/
u32 dmactrl;
u32 dmaaddr;
};
};
u32 epstat;
};
struct gr_regs {
struct gr_epregs epo[GR_MAXEP]; /* 0x000 - 0x0fc */
struct gr_epregs epi[GR_MAXEP]; /* 0x100 - 0x1fc */
u32 control; /* 0x200 */
u32 status; /* 0x204 */
};
#define GR_EPCTRL_BUFSZ_SCALER 8
#define GR_EPCTRL_BUFSZ_MASK 0xffe00000
#define GR_EPCTRL_BUFSZ_POS 21
#define GR_EPCTRL_PI BIT(20)
#define GR_EPCTRL_CB BIT(19)
#define GR_EPCTRL_CS BIT(18)
#define GR_EPCTRL_MAXPL_MASK 0x0003ff80
#define GR_EPCTRL_MAXPL_POS 7
#define GR_EPCTRL_NT_MASK 0x00000060
#define GR_EPCTRL_NT_POS 5
#define GR_EPCTRL_TT_MASK 0x00000018
#define GR_EPCTRL_TT_POS 3
#define GR_EPCTRL_EH BIT(2)
#define GR_EPCTRL_ED BIT(1)
#define GR_EPCTRL_EV BIT(0)
#define GR_DMACTRL_AE BIT(10)
#define GR_DMACTRL_AD BIT(3)
#define GR_DMACTRL_AI BIT(2)
#define GR_DMACTRL_IE BIT(1)
#define GR_DMACTRL_DA BIT(0)
#define GR_EPSTAT_PT BIT(29)
#define GR_EPSTAT_PR BIT(29)
#define GR_EPSTAT_B1CNT_MASK 0x1fff0000
#define GR_EPSTAT_B1CNT_POS 16
#define GR_EPSTAT_B0CNT_MASK 0x0000fff8
#define GR_EPSTAT_B0CNT_POS 3
#define GR_EPSTAT_B1 BIT(2)
#define GR_EPSTAT_B0 BIT(1)
#define GR_EPSTAT_BS BIT(0)
#define GR_CONTROL_SI BIT(31)
#define GR_CONTROL_UI BIT(30)
#define GR_CONTROL_VI BIT(29)
#define GR_CONTROL_SP BIT(28)
#define GR_CONTROL_FI BIT(27)
#define GR_CONTROL_EP BIT(14)
#define GR_CONTROL_DH BIT(13)
#define GR_CONTROL_RW BIT(12)
#define GR_CONTROL_TS_MASK 0x00000e00
#define GR_CONTROL_TS_POS 9
#define GR_CONTROL_TM BIT(8)
#define GR_CONTROL_UA_MASK 0x000000fe
#define GR_CONTROL_UA_POS 1
#define GR_CONTROL_SU BIT(0)
#define GR_STATUS_NEPI_MASK 0xf0000000
#define GR_STATUS_NEPI_POS 28
#define GR_STATUS_NEPO_MASK 0x0f000000
#define GR_STATUS_NEPO_POS 24
#define GR_STATUS_DM BIT(23)
#define GR_STATUS_SU BIT(17)
#define GR_STATUS_UR BIT(16)
#define GR_STATUS_VB BIT(15)
#define GR_STATUS_SP BIT(14)
#define GR_STATUS_AF_MASK 0x00003800
#define GR_STATUS_AF_POS 11
#define GR_STATUS_FN_MASK 0x000007ff
#define GR_STATUS_FN_POS 0
#define MAX_CTRL_PL_SIZE 64 /* As per USB standard for full and high speed */
/*-------------------------------------------------------------------------*/
/* Driver data structures and utilities */
struct gr_dma_desc {
u32 ctrl;
u32 data;
u32 next;
/* These must be last because hw uses the previous three */
u32 paddr;
struct gr_dma_desc *next_desc;
};
#define GR_DESC_OUT_CTRL_SE BIT(17)
#define GR_DESC_OUT_CTRL_IE BIT(15)
#define GR_DESC_OUT_CTRL_NX BIT(14)
#define GR_DESC_OUT_CTRL_EN BIT(13)
#define GR_DESC_OUT_CTRL_LEN_MASK 0x00001fff
#define GR_DESC_IN_CTRL_MO BIT(18)
#define GR_DESC_IN_CTRL_PI BIT(17)
#define GR_DESC_IN_CTRL_ML BIT(16)
#define GR_DESC_IN_CTRL_IE BIT(15)
#define GR_DESC_IN_CTRL_NX BIT(14)
#define GR_DESC_IN_CTRL_EN BIT(13)
#define GR_DESC_IN_CTRL_LEN_MASK 0x00001fff
#define GR_DESC_DMAADDR_MASK 0xfffffffc
struct gr_ep {
struct usb_ep ep;
struct gr_udc *dev;
u16 bytes_per_buffer;
unsigned int dma_start;
struct gr_epregs __iomem *regs;
unsigned num:8;
unsigned is_in:1;
unsigned stopped:1;
unsigned wedged:1;
unsigned callback:1;
/* analogous to a host-side qh */
struct list_head queue;
struct list_head ep_list;
/* Bounce buffer for end of "odd" sized OUT requests */
void *tailbuf;
dma_addr_t tailbuf_paddr;
};
struct gr_request {
struct usb_request req;
struct list_head queue;
/* Chain of dma descriptors */
struct gr_dma_desc *first_desc; /* First in the chain */
struct gr_dma_desc *curr_desc; /* Current descriptor */
struct gr_dma_desc *last_desc; /* Last in the chain */
u16 evenlen; /* Size of even length head (if oddlen != 0) */
u16 oddlen; /* Size of odd length tail if buffer length is "odd" */
u8 setup; /* Setup packet */
};
enum gr_ep0state {
GR_EP0_DISCONNECT = 0, /* No host */
GR_EP0_SETUP, /* Between STATUS ack and SETUP report */
GR_EP0_IDATA, /* IN data stage */
GR_EP0_ODATA, /* OUT data stage */
GR_EP0_ISTATUS, /* Status stage after IN data stage */
GR_EP0_OSTATUS, /* Status stage after OUT data stage */
GR_EP0_STALL, /* Data or status stages */
GR_EP0_SUSPEND, /* USB suspend */
};
struct gr_udc {
struct usb_gadget gadget;
struct gr_ep epi[GR_MAXEP];
struct gr_ep epo[GR_MAXEP];
struct usb_gadget_driver *driver;
struct dma_pool *desc_pool;
struct device *dev;
enum gr_ep0state ep0state;
struct gr_request *ep0reqo;
struct gr_request *ep0reqi;
struct gr_regs __iomem *regs;
int irq;
int irqi;
int irqo;
unsigned added:1;
unsigned irq_enabled:1;
unsigned remote_wakeup:1;
u8 test_mode;
enum usb_device_state suspended_from;
unsigned int nepi;
unsigned int nepo;
struct list_head ep_list;
spinlock_t lock; /* General lock, a.k.a. "dev->lock" in comments */
struct dentry *dfs_root;
};
#define to_gr_udc(gadget) (container_of((gadget), struct gr_udc, gadget))
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