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