/*
* Intel Langwell USB Device Controller driver
* Copyright (C) 2008-2009, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <linux/usb/langwell_udc.h>
#include <linux/usb/langwell_otg.h>
/*-------------------------------------------------------------------------*/
/* driver data structures and utilities */
/*
* dTD: Device Endpoint Transfer Descriptor
* describe to the device controller the location and quantity of
* data to be send/received for given transfer
*/
struct langwell_dtd {
u32 dtd_next;
/* bits 31:5, next transfer element pointer */
#define DTD_NEXT(d) (((d)>>5)&0x7ffffff)
#define DTD_NEXT_MASK (0x7ffffff << 5)
/* terminate */
#define DTD_TERM BIT(0)
/* bits 7:0, execution back states */
u32 dtd_status:8;
#define DTD_STATUS(d) (((d)>>0)&0xff)
#define DTD_STS_ACTIVE BIT(7) /* active */
#define DTD_STS_HALTED BIT(6) /* halted */
#define DTD_STS_DBE BIT(5) /* data buffer error */
#define DTD_STS_TRE BIT(3) /* transaction error */
/* bits 9:8 */
u32 dtd_res0:2;
/* bits 11:10, multipier override */
u32 dtd_multo:2;
#define DTD_MULTO (BIT(11) | BIT(10))
/* bits 14:12 */
u32 dtd_res1:3;
/* bit 15, interrupt on complete */
u32 dtd_ioc:1;
#define DTD_IOC BIT(15)
/* bits 30:16, total bytes */
u32 dtd_total:15;
#define DTD_TOTAL(d) (((d)>>16)&0x7fff)
#define DTD_MAX_TRANSFER_LENGTH 0x4000
/* bit 31 */
u32 dtd_res2:1;
/* dTD buffer pointer page 0 to 4 */
u32 dtd_buf[5];
#define DTD_OFFSET_MASK 0xfff
/* bits 31:12, buffer pointer */
#define DTD_BUFFER(d) (((d)>>12)&0x3ff)
/* bits 11:0, current offset */
#define DTD_C_OFFSET(d) (((d)>>0)&0xfff)
/* bits 10:0, frame number */
#define DTD_FRAME(d) (((d)>>0)&0x7ff)
/* driver-private parts */
/* dtd dma address */
dma_addr_t dtd_dma;
/* next dtd virtual address */
struct langwell_dtd *next_dtd_virt;
};
/*
* dQH: Device Endpoint Queue Head
* describe where all transfers are managed
* 48-byte data structure, aligned on 64-byte boundary
*
* These are associated with dTD structure
*/
struct langwell_dqh {
/* endpoint capabilities and characteristics */
u32 dqh_res0:15; /* bits 14:0 */
u32 dqh_ios:1; /* bit 15, interrupt on setup */
#define DQH_IOS BIT(15)
u32 dqh_mpl:11; /* bits 26:16, maximum packet length */
#define DQH_MPL (0x7ff << 16)
u32 dqh_res1:2; /* bits 28:27 */
u32 dqh_zlt:1; /* bit 29, zero length termination */
#define DQH_ZLT BIT(29)
u32 dqh_mult:2; /* bits 31:30 */
#define DQH_MULT (BIT(30) | BIT(31))
/* current dTD pointer */
u32 dqh_current; /* locate the transfer in progress */
#define DQH_C_DTD(e) \
(((e)>>5)&0x7ffffff) /* bits 31:5, current dTD pointer */
/* transfer overlay, hardware parts of a struct langwell_dtd */
u32 dtd_next;
u32 dtd_status:8; /* bits 7:0, execution back states */
u32 dtd_res0:2; /* bits 9:8 */
u32 dtd_multo:2; /* bits 11:10, multipier override */
u32 dtd_res1:3; /* bits 14:12 */
u32 dtd_ioc:1; /* bit 15, interrupt on complete */
u32 dtd_total:15; /* bits 30:16, total bytes */
u32 dtd_res2:1; /* bit 31 */
u32 dtd_buf[5]; /* dTD buffer pointer page 0 to 4 */
u32 dqh_res2;
struct usb_ctrlrequest dqh_setup; /* setup packet buffer */
} __attribute__ ((aligned(64)));
/* endpoint data structure */
struct langwell_ep {
struct usb_ep ep;
dma_addr_t dma;
struct langwell_udc *dev;
unsigned long irqs;
struct list_head queue;
struct langwell_dqh *dqh;
const struct usb_endpoint_descriptor *desc;
char name[14];
unsigned stopped:1,
ep_type:2,
ep_num:8;
};
/* request data structure */
struct langwell_request {
struct usb_request req;
struct langwell_dtd *dtd, *head, *tail;
struct langwell_ep *ep;
dma_addr_t dtd_dma;
struct list_head queue;
unsigned dtd_count;
unsigned mapped:1;
};
/* ep0 transfer state */
enum ep0_state {
WAIT_FOR_SETUP,
DATA_STATE_XMIT,
DATA_STATE_NEED_ZLP,
WAIT_FOR_OUT_STATUS,
DATA_STATE_RECV,
};
/* device suspend state */
enum lpm_state {
LPM_L0, /* on */
LPM_L1, /* LPM L1 sleep */
LPM_L2, /* suspend */
LPM_L3, /* off */
};
/* device data structure */
struct langwell_udc {
/* each pci device provides one gadget, several endpoints */
struct usb_gadget gadget;
spinlock_t lock; /* device lock */
struct langwell_ep *ep;
struct usb_gadget_driver *driver;
struct otg_transceiver *transceiver;
u8 dev_addr;
u32 usb_state;
u32 resume_state;
u32 bus_reset;
enum lpm_state lpm_state;
enum ep0_state ep0_state;
u32 ep0_dir;
u16 dciversion;
unsigned ep_max;
unsigned devcap:1,
enabled:1,
region:1,
got_irq:1,
powered:1,
remote_wakeup:1,
rate:1,
is_reset:1,
softconnected:1,
vbus_active:1,
suspended:1,
stopped:1,
lpm:1, /* LPM capability */
has_sram:1, /* SRAM caching */
got_sram:1;
/* pci state used to access those endpoints */
struct pci_dev *pdev;
/* Langwell otg transceiver */
struct langwell_otg *lotg;
/* control registers */
struct langwell_cap_regs __iomem *cap_regs;
struct langwell_op_regs __iomem *op_regs;
struct usb_ctrlrequest local_setup_buff;
struct langwell_dqh *ep_dqh;
size_t ep_dqh_size;
dma_addr_t ep_dqh_dma;
/* ep0 status request */
struct langwell_request *status_req;
/* dma pool */
struct dma_pool *dtd_pool;
/* make sure release() is done */
struct completion *done;
/* for private SRAM caching */
unsigned int sram_addr;
unsigned int sram_size;
/* device status data for get_status request */
u16 dev_status;
};