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-rw-r--r--drivers/hsi/clients/Kconfig8
-rw-r--r--drivers/hsi/clients/Makefile3
-rw-r--r--drivers/hsi/clients/ssi_protocol.c1191
-rw-r--r--include/linux/hsi/ssi_protocol.h42
4 files changed, 1243 insertions, 1 deletions
diff --git a/drivers/hsi/clients/Kconfig b/drivers/hsi/clients/Kconfig
index 3bacd275f479..1457cfb5b453 100644
--- a/drivers/hsi/clients/Kconfig
+++ b/drivers/hsi/clients/Kconfig
@@ -4,6 +4,14 @@
4 4
5comment "HSI clients" 5comment "HSI clients"
6 6
7config SSI_PROTOCOL
8 tristate "SSI protocol"
9 depends on HSI && PHONET && (OMAP_SSI=y || OMAP_SSI=m)
10 help
11 If you say Y here, you will enable the SSI protocol aka McSAAB.
12
13 If unsure, say N.
14
7config HSI_CHAR 15config HSI_CHAR
8 tristate "HSI/SSI character driver" 16 tristate "HSI/SSI character driver"
9 depends on HSI 17 depends on HSI
diff --git a/drivers/hsi/clients/Makefile b/drivers/hsi/clients/Makefile
index 327c0e27c8b0..ccbf768ea42b 100644
--- a/drivers/hsi/clients/Makefile
+++ b/drivers/hsi/clients/Makefile
@@ -2,4 +2,5 @@
2# Makefile for HSI clients 2# Makefile for HSI clients
3# 3#
4 4
5obj-$(CONFIG_HSI_CHAR) += hsi_char.o 5obj-$(CONFIG_SSI_PROTOCOL) += ssi_protocol.o
6obj-$(CONFIG_HSI_CHAR) += hsi_char.o
diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
new file mode 100644
index 000000000000..ce4be3738d46
--- /dev/null
+++ b/drivers/hsi/clients/ssi_protocol.c
@@ -0,0 +1,1191 @@
1/*
2 * ssi_protocol.c
3 *
4 * Implementation of the SSI McSAAB improved protocol.
5 *
6 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
7 * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org>
8 *
9 * Contact: Carlos Chinea <carlos.chinea@nokia.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 * 02110-1301 USA
24 */
25
26#include <linux/atomic.h>
27#include <linux/clk.h>
28#include <linux/device.h>
29#include <linux/err.h>
30#include <linux/gpio.h>
31#include <linux/if_ether.h>
32#include <linux/if_arp.h>
33#include <linux/if_phonet.h>
34#include <linux/init.h>
35#include <linux/irq.h>
36#include <linux/list.h>
37#include <linux/module.h>
38#include <linux/netdevice.h>
39#include <linux/notifier.h>
40#include <linux/scatterlist.h>
41#include <linux/skbuff.h>
42#include <linux/slab.h>
43#include <linux/spinlock.h>
44#include <linux/timer.h>
45#include <linux/hsi/hsi.h>
46#include <linux/hsi/ssi_protocol.h>
47
48void ssi_waketest(struct hsi_client *cl, unsigned int enable);
49
50#define SSIP_TXQUEUE_LEN 100
51#define SSIP_MAX_MTU 65535
52#define SSIP_DEFAULT_MTU 4000
53#define PN_MEDIA_SOS 21
54#define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */
55#define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */
56#define SSIP_KATOUT 15 /* 15 msecs */
57#define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */
58#define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
59#define SSIP_CMT_LOADER_SYNC 0x11223344
60/*
61 * SSI protocol command definitions
62 */
63#define SSIP_COMMAND(data) ((data) >> 28)
64#define SSIP_PAYLOAD(data) ((data) & 0xfffffff)
65/* Commands */
66#define SSIP_SW_BREAK 0
67#define SSIP_BOOTINFO_REQ 1
68#define SSIP_BOOTINFO_RESP 2
69#define SSIP_WAKETEST_RESULT 3
70#define SSIP_START_TRANS 4
71#define SSIP_READY 5
72/* Payloads */
73#define SSIP_DATA_VERSION(data) ((data) & 0xff)
74#define SSIP_LOCAL_VERID 1
75#define SSIP_WAKETEST_OK 0
76#define SSIP_WAKETEST_FAILED 1
77#define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff)
78#define SSIP_MSG_ID(data) ((data) & 0xff)
79/* Generic Command */
80#define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff))
81/* Commands for the control channel */
82#define SSIP_BOOTINFO_REQ_CMD(ver) \
83 SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver))
84#define SSIP_BOOTINFO_RESP_CMD(ver) \
85 SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver))
86#define SSIP_START_TRANS_CMD(pdulen, id) \
87 SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id)))
88#define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0)
89#define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0)
90
91/* Main state machine states */
92enum {
93 INIT,
94 HANDSHAKE,
95 ACTIVE,
96};
97
98/* Send state machine states */
99enum {
100 SEND_IDLE,
101 WAIT4READY,
102 SEND_READY,
103 SENDING,
104 SENDING_SWBREAK,
105};
106
107/* Receive state machine states */
108enum {
109 RECV_IDLE,
110 RECV_READY,
111 RECEIVING,
112};
113
114/**
115 * struct ssi_protocol - SSI protocol (McSAAB) data
116 * @main_state: Main state machine
117 * @send_state: TX state machine
118 * @recv_state: RX state machine
119 * @waketest: Flag to follow wake line test
120 * @rxid: RX data id
121 * @txid: TX data id
122 * @txqueue_len: TX queue length
123 * @tx_wd: TX watchdog
124 * @rx_wd: RX watchdog
125 * @keep_alive: Workaround for SSI HW bug
126 * @lock: To serialize access to this struct
127 * @netdev: Phonet network device
128 * @txqueue: TX data queue
129 * @cmdqueue: Queue of free commands
130 * @cl: HSI client own reference
131 * @link: Link for ssip_list
132 * @tx_usecount: Refcount to keep track the slaves that use the wake line
133 * @channel_id_cmd: HSI channel id for command stream
134 * @channel_id_data: HSI channel id for data stream
135 */
136struct ssi_protocol {
137 unsigned int main_state;
138 unsigned int send_state;
139 unsigned int recv_state;
140 unsigned int waketest:1;
141 u8 rxid;
142 u8 txid;
143 unsigned int txqueue_len;
144 struct timer_list tx_wd;
145 struct timer_list rx_wd;
146 struct timer_list keep_alive; /* wake-up workaround */
147 spinlock_t lock;
148 struct net_device *netdev;
149 struct list_head txqueue;
150 struct list_head cmdqueue;
151 struct hsi_client *cl;
152 struct list_head link;
153 atomic_t tx_usecnt;
154 int channel_id_cmd;
155 int channel_id_data;
156};
157
158/* List of ssi protocol instances */
159static LIST_HEAD(ssip_list);
160
161static void ssip_rxcmd_complete(struct hsi_msg *msg);
162
163static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd)
164{
165 u32 *data;
166