1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2002 Intersil Americas Inc.
4 * Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
5 */
6
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/delay.h>
10 #include <linux/ktime.h>
11
12 #include <linux/uaccess.h>
13 #include <asm/io.h>
14
15 #include "prismcompat.h"
16 #include "isl_38xx.h"
17 #include "islpci_dev.h"
18 #include "islpci_mgt.h"
19
20 /******************************************************************************
21 Device Interface & Control functions
22 ******************************************************************************/
23
24 /**
25 * isl38xx_disable_interrupts - disable all interrupts
26 * @device: pci memory base address
27 *
28 * Instructs the device to disable all interrupt reporting by asserting
29 * the IRQ line. New events may still show up in the interrupt identification
30 * register located at offset %ISL38XX_INT_IDENT_REG.
31 */
32 void
isl38xx_disable_interrupts(void __iomem * device)33 isl38xx_disable_interrupts(void __iomem *device)
34 {
35 isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
36 udelay(ISL38XX_WRITEIO_DELAY);
37 }
38
39 void
isl38xx_handle_sleep_request(isl38xx_control_block * control_block,int * powerstate,void __iomem * device_base)40 isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
41 int *powerstate, void __iomem *device_base)
42 {
43 /* device requests to go into sleep mode
44 * check whether the transmit queues for data and management are empty */
45 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
46 /* data tx queue not empty */
47 return;
48
49 if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
50 /* management tx queue not empty */
51 return;
52
53 /* check also whether received frames are pending */
54 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
55 /* data rx queue not empty */
56 return;
57
58 if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
59 /* management rx queue not empty */
60 return;
61
62 #if VERBOSE > SHOW_ERROR_MESSAGES
63 DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
64 #endif
65
66 /* all queues are empty, allow the device to go into sleep mode */
67 *powerstate = ISL38XX_PSM_POWERSAVE_STATE;
68
69 /* assert the Sleep interrupt in the Device Interrupt Register */
70 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
71 ISL38XX_DEV_INT_REG);
72 udelay(ISL38XX_WRITEIO_DELAY);
73 }
74
75 void
isl38xx_handle_wakeup(isl38xx_control_block * control_block,int * powerstate,void __iomem * device_base)76 isl38xx_handle_wakeup(isl38xx_control_block *control_block,
77 int *powerstate, void __iomem *device_base)
78 {
79 /* device is in active state, update the powerstate flag */
80 *powerstate = ISL38XX_PSM_ACTIVE_STATE;
81
82 /* now check whether there are frames pending for the card */
83 if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
84 && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
85 return;
86
87 #if VERBOSE > SHOW_ERROR_MESSAGES
88 DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
89 #endif
90
91 /* either data or management transmit queue has a frame pending
92 * trigger the device by setting the Update bit in the Device Int reg */
93 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
94 ISL38XX_DEV_INT_REG);
95 udelay(ISL38XX_WRITEIO_DELAY);
96 }
97
98 void
isl38xx_trigger_device(int asleep,void __iomem * device_base)99 isl38xx_trigger_device(int asleep, void __iomem *device_base)
100 {
101 u32 reg;
102
103 #if VERBOSE > SHOW_ERROR_MESSAGES
104 u32 counter = 0;
105 struct timespec64 current_ts64;
106 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
107 #endif
108
109 /* check whether the device is in power save mode */
110 if (asleep) {
111 /* device is in powersave, trigger the device for wakeup */
112 #if VERBOSE > SHOW_ERROR_MESSAGES
113 ktime_get_real_ts64(¤t_ts64);
114 DEBUG(SHOW_TRACING, "%lld.%09ld Device wakeup triggered\n",
115 (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
116
117 DEBUG(SHOW_TRACING, "%lld.%09ld Device register read %08x\n",
118 (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
119 readl(device_base + ISL38XX_CTRL_STAT_REG));
120 #endif
121
122 reg = readl(device_base + ISL38XX_INT_IDENT_REG);
123 if (reg == 0xabadface) {
124 #if VERBOSE > SHOW_ERROR_MESSAGES
125 ktime_get_real_ts64(¤t_ts64);
126 DEBUG(SHOW_TRACING,
127 "%lld.%09ld Device register abadface\n",
128 (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
129 #endif
130 /* read the Device Status Register until Sleepmode bit is set */
131 while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
132 (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
133 udelay(ISL38XX_WRITEIO_DELAY);
134 #if VERBOSE > SHOW_ERROR_MESSAGES
135 counter++;
136 #endif
137 }
138
139 #if VERBOSE > SHOW_ERROR_MESSAGES
140 DEBUG(SHOW_TRACING,
141 "%lld.%09ld Device register read %08x\n",
142 (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
143 readl(device_base + ISL38XX_CTRL_STAT_REG));
144 ktime_get_real_ts64(¤t_ts64);
145 DEBUG(SHOW_TRACING,
146 "%lld.%09ld Device asleep counter %i\n",
147 (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
148 counter);
149 #endif
150 }
151 /* assert the Wakeup interrupt in the Device Interrupt Register */
152 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
153 ISL38XX_DEV_INT_REG);
154
155 #if VERBOSE > SHOW_ERROR_MESSAGES
156 udelay(ISL38XX_WRITEIO_DELAY);
157
158 /* perform another read on the Device Status Register */
159 reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
160 ktime_get_real_ts64(¤t_ts64);
161 DEBUG(SHOW_TRACING, "%lld.%00ld Device register read %08x\n",
162 (s64)current_ts64.tv_sec, current_ts64.tv_nsec, reg);
163 #endif
164 } else {
165 /* device is (still) awake */
166 #if VERBOSE > SHOW_ERROR_MESSAGES
167 DEBUG(SHOW_TRACING, "Device is in active state\n");
168 #endif
169 /* trigger the device by setting the Update bit in the Device Int reg */
170
171 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
172 ISL38XX_DEV_INT_REG);
173 }
174 }
175
176 void
isl38xx_interface_reset(void __iomem * device_base,dma_addr_t host_address)177 isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
178 {
179 #if VERBOSE > SHOW_ERROR_MESSAGES
180 DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
181 #endif
182
183 /* load the address of the control block in the device */
184 isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
185 udelay(ISL38XX_WRITEIO_DELAY);
186
187 /* set the reset bit in the Device Interrupt Register */
188 isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
189 udelay(ISL38XX_WRITEIO_DELAY);
190
191 /* enable the interrupt for detecting initialization */
192
193 /* Note: Do not enable other interrupts here. We want the
194 * device to have come up first 100% before allowing any other
195 * interrupts. */
196 isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
197 udelay(ISL38XX_WRITEIO_DELAY); /* allow complete full reset */
198 }
199
200 void
isl38xx_enable_common_interrupts(void __iomem * device_base)201 isl38xx_enable_common_interrupts(void __iomem *device_base)
202 {
203 u32 reg;
204
205 reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
206 ISL38XX_INT_IDENT_WAKEUP;
207 isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
208 udelay(ISL38XX_WRITEIO_DELAY);
209 }
210
211 int
isl38xx_in_queue(isl38xx_control_block * cb,int queue)212 isl38xx_in_queue(isl38xx_control_block *cb, int queue)
213 {
214 const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
215 le32_to_cpu(cb->device_curr_frag[queue]));
216
217 /* determine the amount of fragments in the queue depending on the type
218 * of the queue, either transmit or receive */
219
220 BUG_ON(delta < 0); /* driver ptr must be ahead of device ptr */
221
222 switch (queue) {
223 /* send queues */
224 case ISL38XX_CB_TX_MGMTQ:
225 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
226 /* fall through */
227
228 case ISL38XX_CB_TX_DATA_LQ:
229 case ISL38XX_CB_TX_DATA_HQ:
230 BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
231 return delta;
232
233 /* receive queues */
234 case ISL38XX_CB_RX_MGMTQ:
235 BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
236 return ISL38XX_CB_MGMT_QSIZE - delta;
237
238 case ISL38XX_CB_RX_DATA_LQ:
239 case ISL38XX_CB_RX_DATA_HQ:
240 BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
241 return ISL38XX_CB_RX_QSIZE - delta;
242 }
243 BUG();
244 return 0;
245 }
246
