1 /*
2 *
3 * Copyright (C) 2002 Intersil Americas Inc.
4 * Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21 #include <linux/version.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/delay.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/io.h>
28
29 #include "prismcompat.h"
30 #include "isl_38xx.h"
31 #include "islpci_dev.h"
32 #include "islpci_mgt.h"
33
34 /******************************************************************************
35 Device Interface & Control functions
36 ******************************************************************************/
37
38 /**
39 * isl38xx_disable_interrupts - disable all interrupts
40 * @device: pci memory base address
41 *
42 * Instructs the device to disable all interrupt reporting by asserting
43 * the IRQ line. New events may still show up in the interrupt identification
44 * register located at offset %ISL38XX_INT_IDENT_REG.
45 */
46 void
isl38xx_disable_interrupts(void __iomem * device)47 isl38xx_disable_interrupts(void __iomem *device)
48 {
49 isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
50 udelay(ISL38XX_WRITEIO_DELAY);
51 }
52
53 void
isl38xx_handle_sleep_request(isl38xx_control_block * control_block,int * powerstate,void __iomem * device_base)54 isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
55 int *powerstate, void __iomem *device_base)
56 {
57 /* device requests to go into sleep mode
58 * check whether the transmit queues for data and management are empty */
59 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
60 /* data tx queue not empty */
61 return;
62
63 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
64 /* management tx queue not empty */
65 return;
66
67 /* check also whether received frames are pending */
68 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
69 /* data rx queue not empty */
70 return;
71
72 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
73 /* management rx queue not empty */
74 return;
75
76 #if VERBOSE > SHOW_ERROR_MESSAGES
77 DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
78 #endif
79
80 /* all queues are empty, allow the device to go into sleep mode */
81 *powerstate = ISL38XX_PSM_POWERSAVE_STATE;
82
83 /* assert the Sleep interrupt in the Device Interrupt Register */
84 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
85 ISL38XX_DEV_INT_REG);
86 udelay(ISL38XX_WRITEIO_DELAY);
87 }
88
89 void
isl38xx_handle_wakeup(isl38xx_control_block * control_block,int * powerstate,void __iomem * device_base)90 isl38xx_handle_wakeup(isl38xx_control_block *control_block,
91 int *powerstate, void __iomem *device_base)
92 {
93 /* device is in active state, update the powerstate flag */
94 *powerstate = ISL38XX_PSM_ACTIVE_STATE;
95
96 /* now check whether there are frames pending for the card */
97 if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
98 && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
99 return;
100
101 #if VERBOSE > SHOW_ERROR_MESSAGES
102 DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
103 #endif
104
105 /* either data or management transmit queue has a frame pending
106 * trigger the device by setting the Update bit in the Device Int reg */
107 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
108 ISL38XX_DEV_INT_REG);
109 udelay(ISL38XX_WRITEIO_DELAY);
110 }
111
112 void
isl38xx_trigger_device(int asleep,void __iomem * device_base)113 isl38xx_trigger_device(int asleep, void __iomem *device_base)
114 {
115 struct timeval current_time;
116 u32 reg, counter = 0;
117
118 #if VERBOSE > SHOW_ERROR_MESSAGES
119 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
120 #endif
121
122 /* check whether the device is in power save mode */
123 if (asleep) {
124 /* device is in powersave, trigger the device for wakeup */
125 #if VERBOSE > SHOW_ERROR_MESSAGES
126 do_gettimeofday(¤t_time);
127 DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
128 current_time.tv_sec, current_time.tv_usec);
129 #endif
130
131 DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
132 current_time.tv_sec, current_time.tv_usec,
133 readl(device_base + ISL38XX_CTRL_STAT_REG));
134 udelay(ISL38XX_WRITEIO_DELAY);
135
136 reg = readl(device_base + ISL38XX_INT_IDENT_REG);
137 if (reg == 0xabadface) {
138 #if VERBOSE > SHOW_ERROR_MESSAGES
139 do_gettimeofday(¤t_time);
140 DEBUG(SHOW_TRACING,
141 "%08li.%08li Device register abadface\n",
142 current_time.tv_sec, current_time.tv_usec);
143 #endif
144 /* read the Device Status Register until Sleepmode bit is set */
145 while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
146 (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
147 udelay(ISL38XX_WRITEIO_DELAY);
148 counter++;
149 }
150
151 DEBUG(SHOW_TRACING,
152 "%08li.%08li Device register read %08x\n",
153 current_time.tv_sec, current_time.tv_usec,
154 readl(device_base + ISL38XX_CTRL_STAT_REG));
155 udelay(ISL38XX_WRITEIO_DELAY);
156
157 #if VERBOSE > SHOW_ERROR_MESSAGES
158 do_gettimeofday(¤t_time);
159 DEBUG(SHOW_TRACING,
160 "%08li.%08li Device asleep counter %i\n",
161 current_time.tv_sec, current_time.tv_usec,
162 counter);
163 #endif
164 }
165 /* assert the Wakeup interrupt in the Device Interrupt Register */
166 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
167 ISL38XX_DEV_INT_REG);
168 udelay(ISL38XX_WRITEIO_DELAY);
169
170 /* perform another read on the Device Status Register */
171 reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
172 udelay(ISL38XX_WRITEIO_DELAY);
173
174 #if VERBOSE > SHOW_ERROR_MESSAGES
175 do_gettimeofday(¤t_time);
176 DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
177 current_time.tv_sec, current_time.tv_usec, reg);
178 #endif
179 } else {
180 /* device is (still) awake */
181 #if VERBOSE > SHOW_ERROR_MESSAGES
182 DEBUG(SHOW_TRACING, "Device is in active state\n");
183 #endif
184 /* trigger the device by setting the Update bit in the Device Int reg */
185
186 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
187 ISL38XX_DEV_INT_REG);
188 udelay(ISL38XX_WRITEIO_DELAY);
189 }
190 }
191
192 void
isl38xx_interface_reset(void __iomem * device_base,dma_addr_t host_address)193 isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
194 {
195 #if VERBOSE > SHOW_ERROR_MESSAGES
196 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
197 #endif
198
199 /* load the address of the control block in the device */
200 isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
201 udelay(ISL38XX_WRITEIO_DELAY);
202
203 /* set the reset bit in the Device Interrupt Register */
204 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
205 udelay(ISL38XX_WRITEIO_DELAY);
206
207 /* enable the interrupt for detecting initialization */
208
209 /* Note: Do not enable other interrupts here. We want the
210 * device to have come up first 100% before allowing any other
211 * interrupts. */
212 isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
213 udelay(ISL38XX_WRITEIO_DELAY); /* allow complete full reset */
214 }
215
216 void
isl38xx_enable_common_interrupts(void __iomem * device_base)217 isl38xx_enable_common_interrupts(void __iomem *device_base) {
218 u32 reg;
219 reg = ( ISL38XX_INT_IDENT_UPDATE |
220 ISL38XX_INT_IDENT_SLEEP | ISL38XX_INT_IDENT_WAKEUP);
221 isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
222 udelay(ISL38XX_WRITEIO_DELAY);
223 }
224
225 int
isl38xx_in_queue(isl38xx_control_block * cb,int queue)226 isl38xx_in_queue(isl38xx_control_block *cb, int queue)
227 {
228 const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
229 le32_to_cpu(cb->device_curr_frag[queue]));
230
231 /* determine the amount of fragments in the queue depending on the type
232 * of the queue, either transmit or receive */
233
234 BUG_ON(delta < 0); /* driver ptr must be ahead of device ptr */
235
236 switch (queue) {
237 /* send queues */
238 case ISL38XX_CB_TX_MGMTQ:
239 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
240 case ISL38XX_CB_TX_DATA_LQ:
241 case ISL38XX_CB_TX_DATA_HQ:
242 BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
243 return delta;
244 break;
245
246 /* receive queues */
247 case ISL38XX_CB_RX_MGMTQ:
248 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
249 return ISL38XX_CB_MGMT_QSIZE - delta;
250 break;
251
252 case ISL38XX_CB_RX_DATA_LQ:
253 case ISL38XX_CB_RX_DATA_HQ:
254 BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
255 return ISL38XX_CB_RX_QSIZE - delta;
256 break;
257 }
258 BUG();
259 return 0;
260 }
261