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>
21 #include <linux/usb/langwell_otg.h>
23 /*-------------------------------------------------------------------------*/
25 /* driver data structures and utilities */
28 * dTD: Device Endpoint Transfer Descriptor
29 * describe to the device controller the location and quantity of
30 * data to be send/received for given transfer
34 /* bits 31:5, next transfer element pointer */
35 #define DTD_NEXT(d) (((d)>>5)&0x7ffffff)
36 #define DTD_NEXT_MASK (0x7ffffff << 5)
38 #define DTD_TERM BIT(0)
39 /* bits 7:0, execution back states */
41 #define DTD_STATUS(d) (((d)>>0)&0xff)
42 #define DTD_STS_ACTIVE BIT(7) /* active */
43 #define DTD_STS_HALTED BIT(6) /* halted */
44 #define DTD_STS_DBE BIT(5) /* data buffer error */
45 #define DTD_STS_TRE BIT(3) /* transaction error */
48 /* bits 11:10, multipier override */
50 #define DTD_MULTO (BIT(11) | BIT(10))
53 /* bit 15, interrupt on complete */
55 #define DTD_IOC BIT(15)
56 /* bits 30:16, total bytes */
58 #define DTD_TOTAL(d) (((d)>>16)&0x7fff)
59 #define DTD_MAX_TRANSFER_LENGTH 0x4000
62 /* dTD buffer pointer page 0 to 4 */
64 #define DTD_OFFSET_MASK 0xfff
65 /* bits 31:12, buffer pointer */
66 #define DTD_BUFFER(d) (((d)>>12)&0x3ff)
67 /* bits 11:0, current offset */
68 #define DTD_C_OFFSET(d) (((d)>>0)&0xfff)
69 /* bits 10:0, frame number */
70 #define DTD_FRAME(d) (((d)>>0)&0x7ff)
72 /* driver-private parts */
76 /* next dtd virtual address */
77 struct langwell_dtd *next_dtd_virt;
82 * dQH: Device Endpoint Queue Head
83 * describe where all transfers are managed
84 * 48-byte data structure, aligned on 64-byte boundary
86 * These are associated with dTD structure
89 /* endpoint capabilities and characteristics */
90 u32 dqh_res0:15; /* bits 14:0 */
91 u32 dqh_ios:1; /* bit 15, interrupt on setup */
92 #define DQH_IOS BIT(15)
93 u32 dqh_mpl:11; /* bits 26:16, maximum packet length */
94 #define DQH_MPL (0x7ff << 16)
95 u32 dqh_res1:2; /* bits 28:27 */
96 u32 dqh_zlt:1; /* bit 29, zero length termination */
97 #define DQH_ZLT BIT(29)
98 u32 dqh_mult:2; /* bits 31:30 */
99 #define DQH_MULT (BIT(30) | BIT(31))
101 /* current dTD pointer */
102 u32 dqh_current; /* locate the transfer in progress */
103 #define DQH_C_DTD(e) \
104 (((e)>>5)&0x7ffffff) /* bits 31:5, current dTD pointer */
106 /* transfer overlay, hardware parts of a struct langwell_dtd */
108 u32 dtd_status:8; /* bits 7:0, execution back states */
109 u32 dtd_res0:2; /* bits 9:8 */
110 u32 dtd_multo:2; /* bits 11:10, multipier override */
111 u32 dtd_res1:3; /* bits 14:12 */
112 u32 dtd_ioc:1; /* bit 15, interrupt on complete */
113 u32 dtd_total:15; /* bits 30:16, total bytes */
114 u32 dtd_res2:1; /* bit 31 */
115 u32 dtd_buf[5]; /* dTD buffer pointer page 0 to 4 */
118 struct usb_ctrlrequest dqh_setup; /* setup packet buffer */
119 } __attribute__ ((aligned(64)));
122 /* endpoint data structure */
126 struct langwell_udc *dev;
128 struct list_head queue;
129 struct langwell_dqh *dqh;
130 const struct usb_endpoint_descriptor *desc;
138 /* request data structure */
139 struct langwell_request {
140 struct usb_request req;
141 struct langwell_dtd *dtd, *head, *tail;
142 struct langwell_ep *ep;
144 struct list_head queue;
150 /* ep0 transfer state */
160 /* device suspend state */
163 LPM_L1, /* LPM L1 sleep */
164 LPM_L2, /* suspend */
169 /* device data structure */
170 struct langwell_udc {
171 /* each pci device provides one gadget, several endpoints */
172 struct usb_gadget gadget;
173 spinlock_t lock; /* device lock */
174 struct langwell_ep *ep;
175 struct usb_gadget_driver *driver;
176 struct otg_transceiver *transceiver;
181 enum lpm_state lpm_state;
182 enum ep0_state ep0_state;
198 lpm:1, /* LPM capability */
199 has_sram:1, /* SRAM caching */
202 /* pci state used to access those endpoints */
203 struct pci_dev *pdev;
205 /* Langwell otg transceiver */
206 struct langwell_otg *lotg;
208 /* control registers */
209 struct langwell_cap_regs __iomem *cap_regs;
210 struct langwell_op_regs __iomem *op_regs;
212 struct usb_ctrlrequest local_setup_buff;
213 struct langwell_dqh *ep_dqh;
215 dma_addr_t ep_dqh_dma;
217 /* ep0 status request */
218 struct langwell_request *status_req;
221 struct dma_pool *dtd_pool;
223 /* make sure release() is done */
224 struct completion *done;
226 /* for private SRAM caching */
227 unsigned int sram_addr;
228 unsigned int sram_size;
230 /* device status data for get_status request */