Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / wireless / prism54 / isl_38xx.c
blob02fc67bccbd0bbf46f198df7ea3afe06b5280411
1 /*
2 * Copyright (C) 2002 Intersil Americas Inc.
3 * Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
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
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/delay.h>
24 #include <asm/uaccess.h>
25 #include <asm/io.h>
27 #include "prismcompat.h"
28 #include "isl_38xx.h"
29 #include "islpci_dev.h"
30 #include "islpci_mgt.h"
32 /******************************************************************************
33 Device Interface & Control functions
34 ******************************************************************************/
36 /**
37 * isl38xx_disable_interrupts - disable all interrupts
38 * @device: pci memory base address
40 * Instructs the device to disable all interrupt reporting by asserting
41 * the IRQ line. New events may still show up in the interrupt identification
42 * register located at offset %ISL38XX_INT_IDENT_REG.
44 void
45 isl38xx_disable_interrupts(void __iomem *device)
47 isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
48 udelay(ISL38XX_WRITEIO_DELAY);
51 void
52 isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
53 int *powerstate, void __iomem *device_base)
55 /* device requests to go into sleep mode
56 * check whether the transmit queues for data and management are empty */
57 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
58 /* data tx queue not empty */
59 return;
61 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
62 /* management tx queue not empty */
63 return;
65 /* check also whether received frames are pending */
66 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
67 /* data rx queue not empty */
68 return;
70 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
71 /* management rx queue not empty */
72 return;
74 #if VERBOSE > SHOW_ERROR_MESSAGES
75 DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
76 #endif
78 /* all queues are empty, allow the device to go into sleep mode */
79 *powerstate = ISL38XX_PSM_POWERSAVE_STATE;
81 /* assert the Sleep interrupt in the Device Interrupt Register */
82 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
83 ISL38XX_DEV_INT_REG);
84 udelay(ISL38XX_WRITEIO_DELAY);
87 void
88 isl38xx_handle_wakeup(isl38xx_control_block *control_block,
89 int *powerstate, void __iomem *device_base)
91 /* device is in active state, update the powerstate flag */
92 *powerstate = ISL38XX_PSM_ACTIVE_STATE;
94 /* now check whether there are frames pending for the card */
95 if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
96 && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
97 return;
99 #if VERBOSE > SHOW_ERROR_MESSAGES
100 DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
101 #endif
103 /* either data or management transmit queue has a frame pending
104 * trigger the device by setting the Update bit in the Device Int reg */
105 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
106 ISL38XX_DEV_INT_REG);
107 udelay(ISL38XX_WRITEIO_DELAY);
110 void
111 isl38xx_trigger_device(int asleep, void __iomem *device_base)
113 u32 reg;
115 #if VERBOSE > SHOW_ERROR_MESSAGES
116 u32 counter = 0;
117 struct timeval current_time;
118 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
119 #endif
121 /* check whether the device is in power save mode */
122 if (asleep) {
123 /* device is in powersave, trigger the device for wakeup */
124 #if VERBOSE > SHOW_ERROR_MESSAGES
125 do_gettimeofday(&current_time);
126 DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
127 current_time.tv_sec, (long)current_time.tv_usec);
129 DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
130 current_time.tv_sec, (long)current_time.tv_usec,
131 readl(device_base + ISL38XX_CTRL_STAT_REG));
132 #endif
134 reg = readl(device_base + ISL38XX_INT_IDENT_REG);
135 if (reg == 0xabadface) {
136 #if VERBOSE > SHOW_ERROR_MESSAGES
137 do_gettimeofday(&current_time);
138 DEBUG(SHOW_TRACING,
139 "%08li.%08li Device register abadface\n",
140 current_time.tv_sec, (long)current_time.tv_usec);
141 #endif
142 /* read the Device Status Register until Sleepmode bit is set */
143 while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
144 (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
145 udelay(ISL38XX_WRITEIO_DELAY);
146 #if VERBOSE > SHOW_ERROR_MESSAGES
147 counter++;
148 #endif
151 #if VERBOSE > SHOW_ERROR_MESSAGES
152 DEBUG(SHOW_TRACING,
153 "%08li.%08li Device register read %08x\n",
154 current_time.tv_sec, (long)current_time.tv_usec,
155 readl(device_base + ISL38XX_CTRL_STAT_REG));
156 do_gettimeofday(&current_time);
157 DEBUG(SHOW_TRACING,
158 "%08li.%08li Device asleep counter %i\n",
159 current_time.tv_sec, (long)current_time.tv_usec,
160 counter);
161 #endif
163 /* assert the Wakeup interrupt in the Device Interrupt Register */
164 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
165 ISL38XX_DEV_INT_REG);
167 #if VERBOSE > SHOW_ERROR_MESSAGES
168 udelay(ISL38XX_WRITEIO_DELAY);
170 /* perform another read on the Device Status Register */
171 reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
172 do_gettimeofday(&current_time);
173 DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
174 current_time.tv_sec, (long)current_time.tv_usec, reg);
175 #endif
176 } else {
177 /* device is (still) awake */
178 #if VERBOSE > SHOW_ERROR_MESSAGES
179 DEBUG(SHOW_TRACING, "Device is in active state\n");
180 #endif
181 /* trigger the device by setting the Update bit in the Device Int reg */
183 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
184 ISL38XX_DEV_INT_REG);
188 void
189 isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
191 #if VERBOSE > SHOW_ERROR_MESSAGES
192 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
193 #endif
195 /* load the address of the control block in the device */
196 isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
197 udelay(ISL38XX_WRITEIO_DELAY);
199 /* set the reset bit in the Device Interrupt Register */
200 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
201 udelay(ISL38XX_WRITEIO_DELAY);
203 /* enable the interrupt for detecting initialization */
205 /* Note: Do not enable other interrupts here. We want the
206 * device to have come up first 100% before allowing any other
207 * interrupts. */
208 isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
209 udelay(ISL38XX_WRITEIO_DELAY); /* allow complete full reset */
212 void
213 isl38xx_enable_common_interrupts(void __iomem *device_base)
215 u32 reg;
217 reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
218 ISL38XX_INT_IDENT_WAKEUP;
219 isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
220 udelay(ISL38XX_WRITEIO_DELAY);
224 isl38xx_in_queue(isl38xx_control_block *cb, int queue)
226 const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
227 le32_to_cpu(cb->device_curr_frag[queue]));
229 /* determine the amount of fragments in the queue depending on the type
230 * of the queue, either transmit or receive */
232 BUG_ON(delta < 0); /* driver ptr must be ahead of device ptr */
234 switch (queue) {
235 /* send queues */
236 case ISL38XX_CB_TX_MGMTQ:
237 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
239 case ISL38XX_CB_TX_DATA_LQ:
240 case ISL38XX_CB_TX_DATA_HQ:
241 BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
242 return delta;
244 /* receive queues */
245 case ISL38XX_CB_RX_MGMTQ:
246 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
247 return ISL38XX_CB_MGMT_QSIZE - delta;
249 case ISL38XX_CB_RX_DATA_LQ:
250 case ISL38XX_CB_RX_DATA_HQ:
251 BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
252 return ISL38XX_CB_RX_QSIZE - delta;
254 BUG();
255 return 0;