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-rw-r--r--drivers/net/wimax/i2400m/sdio-rx.c255
-rw-r--r--drivers/net/wimax/i2400m/sdio-tx.c153
2 files changed, 408 insertions, 0 deletions
diff --git a/drivers/net/wimax/i2400m/sdio-rx.c b/drivers/net/wimax/i2400m/sdio-rx.c
new file mode 100644
index 000000000000..a3008b904f7d
--- /dev/null
+++ b/drivers/net/wimax/i2400m/sdio-rx.c
@@ -0,0 +1,255 @@
1/*
2 * Intel Wireless WiMAX Connection 2400m
3 * SDIO RX handling
4 *
5 *
6 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * * Neither the name of Intel Corporation nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 *
35 * Intel Corporation <linux-wimax@intel.com>
36 * Dirk Brandewie <dirk.j.brandewie@intel.com>
37 * - Initial implementation
38 *
39 *
40 * This handles the RX path on SDIO.
41 *
42 * The SDIO bus driver calls the "irq" routine when data is available.
43 * This is not a traditional interrupt routine since the SDIO bus
44 * driver calls us from its irq thread context. Because of this
45 * sleeping in the SDIO RX IRQ routine is okay.
46 *
47 * From there on, we obtain the size of the data that is available,
48 * allocate an skb, copy it and then pass it to the generic driver's
49 * RX routine [i2400m_rx()].
50 *
51 * ROADMAP
52 *
53 * i2400ms_irq()
54 * i2400ms_rx()
55 * __i2400ms_rx_get_size()
56 * i2400m_rx()
57 *
58 * i2400ms_rx_setup()
59 *
60 * i2400ms_rx_release()
61 */
62#include <linux/workqueue.h>
63#include <linux/wait.h>
64#include <linux/skbuff.h>
65#include <linux/mmc/sdio.h>
66#include <linux/mmc/sdio_func.h>
67#include "i2400m-sdio.h"
68
69#define D_SUBMODULE rx
70#include "sdio-debug-levels.h"
71
72
73/*
74 * Read and return the amount of bytes available for RX
75 *
76 * The RX size has to be read like this: byte reads of three
77 * sequential locations; then glue'em together.
78 *
79 * sdio_readl() doesn't work.
80 */
81ssize_t __i2400ms_rx_get_size(struct i2400ms *i2400ms)
82{
83 int ret, cnt, val;
84 ssize_t rx_size;
85 unsigned xfer_size_addr;
86 struct sdio_func *func = i2400ms->func;
87 struct device *dev = &i2400ms->func->dev;
88
89 d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
90 xfer_size_addr = I2400MS_INTR_GET_SIZE_ADDR;
91 rx_size = 0;
92 for (cnt = 0; cnt < 3; cnt++) {
93 val = sdio_readb(func, xfer_size_addr + cnt, &ret);
94 if (ret < 0) {
95 dev_err(dev, "RX: Can't read byte %d of RX size from "
96 "0x%08x: %d\n", cnt, xfer_size_addr + cnt, ret);
97 rx_size = ret;
98 goto error_read;
99 }
100 rx_size = rx_size << 8 | (val & 0xff);
101 }
102 d_printf(6, dev, "RX: rx_size is %ld\n", (long) rx_size);
103error_read:
104 d_fnend(7, dev, "(i2400ms %p) = %ld\n", i2400ms, (long) rx_size);
105 return rx_size;
106}
107
108
109/*
110 * Read data from the device (when in normal)
111 *
112 * Allocate an SKB of the right size, read the data in and then
113 * deliver it to the generic layer.
114 *
115 * We also check for a reboot barker. That means the device died and
116 * we have to reboot it.
117 */
118static
119void i2400ms_rx(struct i2400ms *i2400ms)
120{
121 int ret;
122 struct sdio_func *func = i2400ms->func;
123 struct device *dev = &func->dev;
124 struct i2400m *i2400m = &i2400ms->i2400m;
125 struct sk_buff *skb;
126 ssize_t rx_size;
127
128 d_fnstart(7, dev, "(i2400ms %p)\n", i2400ms);
129 rx_size = __i2400ms_rx_get_size(i2400ms);
130 if (rx_size < 0) {
131 ret = rx_size;
132 goto error_get_size;
133 }
134 ret = -ENOMEM;
135 skb = alloc_skb(rx_size, GFP_ATOMIC);
136 if (NULL == skb) {
137 dev_err(dev, "RX: unable to alloc skb\n");
138 goto error_alloc_skb;
139 }
140
141 ret = sdio_memcpy_fromio(func, skb->data,
142 I2400MS_DATA_ADDR, rx_size);
143 if (ret < 0) {
144 dev_err(dev, "RX: SDIO data read failed: %d\n", ret);
145 goto error_memcpy_fromio;
146 }
147 /* Check if device has reset */
148 if (!memcmp(skb->data, i2400m_NBOOT_BARKER,
149 sizeof(i2400m_NBOOT_BARKER))
150 || !memcmp(skb->data, i2400m_SBOOT_BARKER,
151 sizeof(i2400m_SBOOT_BARKER))) {
152 ret = i2400m_dev_reset_handle(i2400m);
153 kfree_skb(skb);
154 } else {
155 skb_put(skb, rx_size);
156 i2400m_rx(i2400m, skb);
157 }
158 d_fnend(7, dev, "(i2400ms %p) = void\n", i2400ms);
159 return;
160
161error_memcpy_fromio:
162 kfree_skb(skb);
163error_alloc_skb:
164error_get_size:
165 d_fnend(7, dev, "(i2400ms %p) = %d\n", i2400ms, ret);
166 return;
167}
168
169
170/*
171 * Process an interrupt from the SDIO card
172 *
173 * FIXME: need to process other events that are not just ready-to-read
174 *
175 * Checks there is data ready and then proceeds to read it.
176 */
177static
178void i2400ms_irq(struct sdio_func *func)
179{
180 int ret;
181 struct i2400ms *i2400ms = sdio_get_drvdata(func);
182 struct i2400m *i2400m = &i2400ms->i2400m;
183 struct device *dev = &func->dev;
184 int val;
185
186 d_fnstart(6, dev, "(i2400ms %p)\n", i2400ms);
187 val = sdio_readb(func, I2400MS_INTR_STATUS_ADDR, &ret);
188 if (ret < 0) {
189 dev_err(dev, "RX: Can't read interrupt status: %d\n", ret);
190 goto error_no_irq;
191 }
192 if (!val) {
193 dev_err(dev, "RX: BUG? got IRQ but no interrupt ready?\n");
194 goto error_no_irq;
195 }
196 sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
197 if (WARN_ON(i2400m->boot_mode != 0))
198 dev_err(dev, "RX: SW BUG? boot mode and IRQ is up?\n");
199 else
200 i2400ms_rx(i2400ms);
201error_no_irq:
202 d_fnend(6, dev, "(i2400ms %p) = void\n", i2400ms);
203 return;
204}
205
206
207/*
208 * Setup SDIO RX
209 *
210 * Hooks up the IRQ handler and then enables IRQs.
211 */
212int i2400ms_rx_setup(struct i2400ms *i2400ms)
213{
214 int result;
215 struct sdio_func *func = i2400ms->func;
216 struct device *dev = &func->dev;
217
218 d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
219 sdio_claim_host(func);
220 result = sdio_claim_irq(func, i2400ms_irq);
221 if (result < 0) {
222 dev_err(dev, "Cannot claim IRQ: %d\n", result);
223 goto error_irq_claim;
224 }
225 result = 0;
226 sdio_writeb(func, 1, I2400MS_INTR_ENABLE_ADDR, &result);
227 if (result < 0) {
228 sdio_release_irq(func);
229 dev_err(dev, "Failed to enable interrupts %d\n", result);
230 }
231error_irq_claim:
232 sdio_release_host(func);
233 d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
234 return result;
235}
236
237
238/*
239 * Tear down SDIO RX
240 *
241 * Disables IRQs in the device and removes the IRQ handler.
242 */
243void i2400ms_rx_release(struct i2400ms *i2400ms)
244{
245 int result;
246 struct sdio_func *func = i2400ms->func;
247 struct device *dev = &func->dev;
248
249 d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
250 sdio_claim_host(func);
251 sdio_writeb(func, 0, I2400MS_INTR_ENABLE_ADDR, &result);
252 sdio_release_irq(func);
253 sdio_release_host(func);
254 d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
255}
diff --git a/drivers/net/wimax/i2400m/sdio-tx.c b/drivers/net/wimax/i2400m/sdio-tx.c
new file mode 100644
index 000000000000..5105a5ebc44f
--- /dev/null
+++ b/drivers/net/wimax/i2400m/sdio-tx.c
@@ -0,0 +1,153 @@
1/*
2 * Intel Wireless WiMAX Connection 2400m
3 * SDIO TX transaction backends
4 *
5 *
6 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * * Neither the name of Intel Corporation nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 *
35 * Intel Corporation <linux-wimax@intel.com>
36 * Dirk Brandewie <dirk.j.brandewie@intel.com>
37 * - Initial implementation
38 *
39 *
40 * Takes the TX messages in the i2400m's driver TX FIFO and sends them
41 * to the device until there are no more.
42 *
43 * If we fail sending the message, we just drop it. There isn't much
44 * we can do at this point. Most of the traffic is network, which has
45 * recovery methods for dropped packets.
46 *
47 * The SDIO functions are not atomic, so we can't run from the context
48 * where i2400m->bus_tx_kick() [i2400ms_bus_tx_kick()] is being called
49 * (some times atomic). Thus, the actual TX work is deferred to a
50 * workqueue.
51 *
52 * ROADMAP
53 *
54 * i2400ms_bus_tx_kick()
55 * i2400ms_tx_submit() [through workqueue]
56 *
57 * i2400m_tx_setup()
58 *
59 * i2400m_tx_release()
60 */
61#include <linux/mmc/sdio_func.h>
62#include "i2400m-sdio.h"
63
64#define D_SUBMODULE tx
65#include "sdio-debug-levels.h"
66
67
68/*
69 * Pull TX transations from the TX FIFO and send them to the device
70 * until there are no more.
71 */
72static
73void i2400ms_tx_submit(struct work_struct *ws)
74{
75 int result;
76 struct i2400ms *i2400ms = container_of(ws, struct i2400ms, tx_worker);
77 struct i2400m *i2400m = &i2400ms->i2400m;
78 struct sdio_func *func = i2400ms->func;
79 struct device *dev = &func->dev;
80 struct i2400m_msg_hdr *tx_msg;
81 size_t tx_msg_size;
82
83 d_fnstart(4, dev, "(i2400ms %p, i2400m %p)\n", i2400ms, i2400ms);
84
85 while (NULL != (tx_msg = i2400m_tx_msg_get(i2400m, &tx_msg_size))) {
86 d_printf(2, dev, "TX: submitting %zu bytes\n", tx_msg_size);
87 d_dump(5, dev, tx_msg, tx_msg_size);
88
89 sdio_claim_host(func);
90 result = sdio_memcpy_toio(func, 0, tx_msg, tx_msg_size);
91 sdio_release_host(func);
92
93 i2400m_tx_msg_sent(i2400m);
94
95 if (result < 0) {
96 dev_err(dev, "TX: cannot submit TX; tx_msg @%zu %zu B:"
97 " %d\n", (void *) tx_msg - i2400m->tx_buf,
98 tx_msg_size, result);
99 }
100
101 d_printf(2, dev, "TX: %zub submitted\n", tx_msg_size);
102 }
103
104 d_fnend(4, dev, "(i2400ms %p) = void\n", i2400ms);
105}
106
107
108/*
109 * The generic driver notifies us that there is data ready for TX
110 *
111 * Schedule a run of i2400ms_tx_submit() to handle it.
112 */
113void i2400ms_bus_tx_kick(struct i2400m *i2400m)
114{
115 struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
116 struct device *dev = &i2400ms->func->dev;
117
118 d_fnstart(3, dev, "(i2400m %p) = void\n", i2400m);
119
120 /* schedule tx work, this is because tx may block, therefore
121 * it has to run in a thread context.
122 */
123 queue_work(i2400ms->tx_workqueue, &i2400ms->tx_worker);
124
125 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
126}
127
128int i2400ms_tx_setup(struct i2400ms *i2400ms)
129{
130 int result;
131 struct device *dev = &i2400ms->func->dev;
132 struct i2400m *i2400m = &i2400ms->i2400m;
133
134 d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms);
135
136 INIT_WORK(&i2400ms->tx_worker, i2400ms_tx_submit);
137 snprintf(i2400ms->tx_wq_name, sizeof(i2400ms->tx_wq_name),
138 "%s-tx", i2400m->wimax_dev.name);
139 i2400ms->tx_workqueue =
140 create_singlethread_workqueue(i2400ms->tx_wq_name);
141 if (NULL == i2400ms->tx_workqueue) {
142 dev_err(dev, "TX: failed to create workqueue\n");
143 result = -ENOMEM;
144 } else
145 result = 0;
146 d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result);
147 return result;
148}
149
150void i2400ms_tx_release(struct i2400ms *i2400ms)
151{
152 destroy_workqueue(i2400ms->tx_workqueue);
153}
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