2 * Intel Langwell USB Device Controller driver
3 * Copyright (C) 2008-2009, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <linux/usb/langwell_udc.h>
22 #if defined(CONFIG_USB_LANGWELL_OTG)
23 #include <linux/usb/langwell_otg.h>
27 /*-------------------------------------------------------------------------*/
29 /* driver data structures and utilities */
32 * dTD: Device Endpoint Transfer Descriptor
33 * describe to the device controller the location and quantity of
34 * data to be send/received for given transfer
38 /* bits 31:5, next transfer element pointer */
39 #define DTD_NEXT(d) (((d)>>5)&0x7ffffff)
40 #define DTD_NEXT_MASK (0x7ffffff << 5)
42 #define DTD_TERM BIT(0)
43 /* bits 7:0, execution back states */
45 #define DTD_STATUS(d) (((d)>>0)&0xff)
46 #define DTD_STS_ACTIVE BIT(7) /* active */
47 #define DTD_STS_HALTED BIT(6) /* halted */
48 #define DTD_STS_DBE BIT(5) /* data buffer error */
49 #define DTD_STS_TRE BIT(3) /* transaction error */
52 /* bits 11:10, multipier override */
54 #define DTD_MULTO (BIT(11) | BIT(10))
57 /* bit 15, interrupt on complete */
59 #define DTD_IOC BIT(15)
60 /* bits 30:16, total bytes */
62 #define DTD_TOTAL(d) (((d)>>16)&0x7fff)
63 #define DTD_MAX_TRANSFER_LENGTH 0x4000
66 /* dTD buffer pointer page 0 to 4 */
68 #define DTD_OFFSET_MASK 0xfff
69 /* bits 31:12, buffer pointer */
70 #define DTD_BUFFER(d) (((d)>>12)&0x3ff)
71 /* bits 11:0, current offset */
72 #define DTD_C_OFFSET(d) (((d)>>0)&0xfff)
73 /* bits 10:0, frame number */
74 #define DTD_FRAME(d) (((d)>>0)&0x7ff)
76 /* driver-private parts */
80 /* next dtd virtual address */
81 struct langwell_dtd *next_dtd_virt;
86 * dQH: Device Endpoint Queue Head
87 * describe where all transfers are managed
88 * 48-byte data structure, aligned on 64-byte boundary
90 * These are associated with dTD structure
93 /* endpoint capabilities and characteristics */
94 u32 dqh_res0:15; /* bits 14:0 */
95 u32 dqh_ios:1; /* bit 15, interrupt on setup */
96 #define DQH_IOS BIT(15)
97 u32 dqh_mpl:11; /* bits 26:16, maximum packet length */
98 #define DQH_MPL (0x7ff << 16)
99 u32 dqh_res1:2; /* bits 28:27 */
100 u32 dqh_zlt:1; /* bit 29, zero length termination */
101 #define DQH_ZLT BIT(29)
102 u32 dqh_mult:2; /* bits 31:30 */
103 #define DQH_MULT (BIT(30) | BIT(31))
105 /* current dTD pointer */
106 u32 dqh_current; /* locate the transfer in progress */
107 #define DQH_C_DTD(e) \
108 (((e)>>5)&0x7ffffff) /* bits 31:5, current dTD pointer */
110 /* transfer overlay, hardware parts of a struct langwell_dtd */
112 u32 dtd_status:8; /* bits 7:0, execution back states */
113 u32 dtd_res0:2; /* bits 9:8 */
114 u32 dtd_multo:2; /* bits 11:10, multipier override */
115 u32 dtd_res1:3; /* bits 14:12 */
116 u32 dtd_ioc:1; /* bit 15, interrupt on complete */
117 u32 dtd_total:15; /* bits 30:16, total bytes */
118 u32 dtd_res2:1; /* bit 31 */
119 u32 dtd_buf[5]; /* dTD buffer pointer page 0 to 4 */
122 struct usb_ctrlrequest dqh_setup; /* setup packet buffer */
123 } __attribute__ ((aligned(64)));
126 /* endpoint data structure */
130 struct langwell_udc *dev;
132 struct list_head queue;
133 struct langwell_dqh *dqh;
134 const struct usb_endpoint_descriptor *desc;
142 /* request data structure */
143 struct langwell_request {
144 struct usb_request req;
145 struct langwell_dtd *dtd, *head, *tail;
146 struct langwell_ep *ep;
148 struct list_head queue;
154 /* ep0 transfer state */
164 /* device suspend state */
167 LPM_L1, /* LPM L1 sleep */
168 LPM_L2, /* suspend */
173 /* device data structure */
174 struct langwell_udc {
175 /* each pci device provides one gadget, several endpoints */
176 struct usb_gadget gadget;
177 spinlock_t lock; /* device lock */
178 struct langwell_ep *ep;
179 struct usb_gadget_driver *driver;
180 struct otg_transceiver *transceiver;
185 enum lpm_state lpm_state;
186 enum ep0_state ep0_state;
202 lpm:1; /* LPM capability */
204 /* pci state used to access those endpoints */
205 struct pci_dev *pdev;
207 /* Langwell otg transceiver */
208 struct langwell_otg *lotg;
210 /* control registers */
211 struct langwell_cap_regs __iomem *cap_regs;
212 struct langwell_op_regs __iomem *op_regs;
214 struct usb_ctrlrequest local_setup_buff;
215 struct langwell_dqh *ep_dqh;
217 dma_addr_t ep_dqh_dma;
219 /* ep0 status request */
220 struct langwell_request *status_req;
223 struct dma_pool *dtd_pool;
225 /* make sure release() is done */
226 struct completion *done;