2 * Copyright (C) ST-Ericsson AB 2010
3 * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
4 * Author: Daniel Martensson / daniel.martensson@stericsson.com
5 * Dmitry.Tarnyagin / dmitry.tarnyagin@stericsson.com
6 * License terms: GNU General Public License (GPL) version 2
12 #include <net/caif/caif_layer.h>
13 #include <net/caif/caif_device.h>
14 #include <linux/atomic.h>
17 * Maximum number of CAIF frames that can reside in the same HSI frame.
19 #define CFHSI_MAX_PKTS 15
22 * Maximum number of bytes used for the frame that can be embedded in the
25 #define CFHSI_MAX_EMB_FRM_SZ 96
28 * Decides if HSI buffers should be prefilled with 0xFF pattern for easier
29 * debugging. Both TX and RX buffers will be filled before the transfer.
31 #define CFHSI_DBG_PREFILL 0
33 /* Structure describing a HSI packet descriptor. */
34 #pragma pack(1) /* Byte alignment. */
38 u16 cffrm_len[CFHSI_MAX_PKTS];
39 u8 emb_frm[CFHSI_MAX_EMB_FRM_SZ];
41 #pragma pack() /* Default alignment. */
43 /* Size of the complete HSI packet descriptor. */
44 #define CFHSI_DESC_SZ (sizeof(struct cfhsi_desc))
47 * Size of the complete HSI packet descriptor excluding the optional embedded
50 #define CFHSI_DESC_SHORT_SZ (CFHSI_DESC_SZ - CFHSI_MAX_EMB_FRM_SZ)
53 * Maximum bytes transferred in one transfer.
55 #define CFHSI_MAX_CAIF_FRAME_SZ 4096
57 #define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * CFHSI_MAX_CAIF_FRAME_SZ)
59 /* Size of the complete HSI TX buffer. */
60 #define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)
62 /* Size of the complete HSI RX buffer. */
63 #define CFHSI_BUF_SZ_RX ((2 * CFHSI_DESC_SZ) + CFHSI_MAX_PAYLOAD_SZ)
65 /* Bitmasks for the HSI descriptor. */
66 #define CFHSI_PIGGY_DESC (0x01 << 7)
68 #define CFHSI_TX_STATE_IDLE 0
69 #define CFHSI_TX_STATE_XFER 1
71 #define CFHSI_RX_STATE_DESC 0
72 #define CFHSI_RX_STATE_PAYLOAD 1
74 /* Bitmasks for power management. */
75 #define CFHSI_WAKE_UP 0
76 #define CFHSI_WAKE_UP_ACK 1
77 #define CFHSI_WAKE_DOWN_ACK 2
79 #define CFHSI_WAKELOCK_HELD 4
80 #define CFHSI_SHUTDOWN 5
81 #define CFHSI_FLUSH_FIFO 6
83 #ifndef CFHSI_INACTIVITY_TOUT
84 #define CFHSI_INACTIVITY_TOUT (1 * HZ)
85 #endif /* CFHSI_INACTIVITY_TOUT */
87 #ifndef CFHSI_WAKE_TOUT
88 #define CFHSI_WAKE_TOUT (3 * HZ)
89 #endif /* CFHSI_WAKE_TOUT */
91 #ifndef CFHSI_MAX_RX_RETRIES
92 #define CFHSI_MAX_RX_RETRIES (10 * HZ)
95 /* Structure implemented by the CAIF HSI driver. */
97 void (*tx_done_cb) (struct cfhsi_cb_ops *drv);
98 void (*rx_done_cb) (struct cfhsi_cb_ops *drv);
99 void (*wake_up_cb) (struct cfhsi_cb_ops *drv);
100 void (*wake_down_cb) (struct cfhsi_cb_ops *drv);
103 /* Structure implemented by HSI device. */
105 int (*cfhsi_up) (struct cfhsi_ops *dev);
106 int (*cfhsi_down) (struct cfhsi_ops *dev);
107 int (*cfhsi_tx) (u8 *ptr, int len, struct cfhsi_ops *dev);
108 int (*cfhsi_rx) (u8 *ptr, int len, struct cfhsi_ops *dev);
109 int (*cfhsi_wake_up) (struct cfhsi_ops *dev);
110 int (*cfhsi_wake_down) (struct cfhsi_ops *dev);
111 int (*cfhsi_get_peer_wake) (struct cfhsi_ops *dev, bool *status);
112 int (*cfhsi_fifo_occupancy) (struct cfhsi_ops *dev, size_t *occupancy);
113 int (*cfhsi_rx_cancel)(struct cfhsi_ops *dev);
114 struct cfhsi_cb_ops *cb_ops;
117 /* Structure holds status of received CAIF frames processing */
118 struct cfhsi_rx_state {
126 /* Priority mapping */
135 struct cfhsi_config {
136 u32 inactivity_timeout;
137 u32 aggregation_timeout;
144 /* Structure implemented by CAIF HSI drivers. */
146 struct caif_dev_common cfdev;
147 struct net_device *ndev;
148 struct platform_device *pdev;
149 struct sk_buff_head qhead[CFHSI_PRIO_LAST];
150 struct cfhsi_cb_ops cb_ops;
151 struct cfhsi_ops *ops;
153 struct cfhsi_rx_state rx_state;
154 struct cfhsi_config cfg;
162 struct list_head list;
163 struct work_struct wake_up_work;
164 struct work_struct wake_down_work;
165 struct work_struct out_of_sync_work;
166 struct workqueue_struct *wq;
167 wait_queue_head_t wake_up_wait;
168 wait_queue_head_t wake_down_wait;
169 wait_queue_head_t flush_fifo_wait;
170 struct timer_list inactivity_timer;
171 struct timer_list rx_slowpath_timer;
175 struct timer_list aggregation_timer;
179 extern struct platform_driver cfhsi_driver;
182 * enum ifla_caif_hsi - CAIF HSI NetlinkRT parameters.
183 * @IFLA_CAIF_HSI_INACTIVITY_TOUT: Inactivity timeout before
184 * taking the HSI wakeline down, in milliseconds.
185 * When using RT Netlink to create, destroy or configure a CAIF HSI interface,
186 * enum ifla_caif_hsi is used to specify the configuration attributes.
189 __IFLA_CAIF_HSI_UNSPEC,
190 __IFLA_CAIF_HSI_INACTIVITY_TOUT,
191 __IFLA_CAIF_HSI_AGGREGATION_TOUT,
192 __IFLA_CAIF_HSI_HEAD_ALIGN,
193 __IFLA_CAIF_HSI_TAIL_ALIGN,
194 __IFLA_CAIF_HSI_QHIGH_WATERMARK,
195 __IFLA_CAIF_HSI_QLOW_WATERMARK,
199 extern struct cfhsi_ops *cfhsi_get_ops(void);
201 #endif /* CAIF_HSI_H_ */