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 */
32void
33isl38xx_disable_interrupts(void __iomem *device)
34{
35	isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
36	udelay(ISL38XX_WRITEIO_DELAY);
37}
38
39void
40isl38xx_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
75void
76isl38xx_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
98void
99isl38xx_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(&current_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(&current_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(&current_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(&current_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
176void
177isl38xx_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
200void
201isl38xx_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
211int
212isl38xx_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		fallthrough;
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