[deliverable/linux.git] / drivers / net / wireless / prism54 / isl_38xx.c

/*
 *  Copyright (C) 2002 Intersil Americas Inc.
 *  Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/delay.h>

#include <asm/uaccess.h>
#include <asm/io.h>

#include "prismcompat.h"
#include "isl_38xx.h"
#include "islpci_dev.h"
#include "islpci_mgt.h"

/******************************************************************************
    Device Interface & Control functions
******************************************************************************/

/**
 * isl38xx_disable_interrupts - disable all interrupts
 * @device: pci memory base address
 *
 *  Instructs the device to disable all interrupt reporting by asserting
 *  the IRQ line. New events may still show up in the interrupt identification
 *  register located at offset %ISL38XX_INT_IDENT_REG.
 */
void
isl38xx_disable_interrupts(void __iomem *device)
{
	isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
	udelay(ISL38XX_WRITEIO_DELAY);
}

void
isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
			     int *powerstate, void __iomem *device_base)
{
	/* device requests to go into sleep mode
	 * check whether the transmit queues for data and management are empty */
	if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
		/* data tx queue not empty */
		return;

	if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
		/* management tx queue not empty */
		return;

	/* check also whether received frames are pending */
	if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
		/* data rx queue not empty */
		return;

	if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
		/* management rx queue not empty */
		return;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
#endif

	/* all queues are empty, allow the device to go into sleep mode */
	*powerstate = ISL38XX_PSM_POWERSAVE_STATE;

	/* assert the Sleep interrupt in the Device Interrupt Register */
	isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
			  ISL38XX_DEV_INT_REG);
	udelay(ISL38XX_WRITEIO_DELAY);
}

void
isl38xx_handle_wakeup(isl38xx_control_block *control_block,
		      int *powerstate, void __iomem *device_base)
{
	/* device is in active state, update the powerstate flag */
	*powerstate = ISL38XX_PSM_ACTIVE_STATE;

	/* now check whether there are frames pending for the card */
	if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
	    && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
		return;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
#endif

	/* either data or management transmit queue has a frame pending
	 * trigger the device by setting the Update bit in the Device Int reg */
	isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
			  ISL38XX_DEV_INT_REG);
	udelay(ISL38XX_WRITEIO_DELAY);
}

void
isl38xx_trigger_device(int asleep, void __iomem *device_base)
{
	u32 reg;

#if VERBOSE > SHOW_ERROR_MESSAGES
	u32 counter = 0;
	struct timeval current_time;
	DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
#endif

	/* check whether the device is in power save mode */
	if (asleep) {
		/* device is in powersave, trigger the device for wakeup */
#if VERBOSE > SHOW_ERROR_MESSAGES
		do_gettimeofday(&current_time);
		DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
		      current_time.tv_sec, (long)current_time.tv_usec);

		DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
		      current_time.tv_sec, (long)current_time.tv_usec,
		      readl(device_base + ISL38XX_CTRL_STAT_REG));
#endif

		reg = readl(device_base + ISL38XX_INT_IDENT_REG);
		if (reg == 0xabadface) {
#if VERBOSE > SHOW_ERROR_MESSAGES
			do_gettimeofday(&current_time);
			DEBUG(SHOW_TRACING,
			      "%08li.%08li Device register abadface\n",
			      current_time.tv_sec, (long)current_time.tv_usec);
#endif
			/* read the Device Status Register until Sleepmode bit is set */
			while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
			       (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
				udelay(ISL38XX_WRITEIO_DELAY);
#if VERBOSE > SHOW_ERROR_MESSAGES
				counter++;
#endif
			}

#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING,
			      "%08li.%08li Device register read %08x\n",
			      current_time.tv_sec, (long)current_time.tv_usec,
			      readl(device_base + ISL38XX_CTRL_STAT_REG));
			do_gettimeofday(&current_time);
			DEBUG(SHOW_TRACING,
			      "%08li.%08li Device asleep counter %i\n",
			      current_time.tv_sec, (long)current_time.tv_usec,
			      counter);
#endif
		}
		/* assert the Wakeup interrupt in the Device Interrupt Register */
		isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
				  ISL38XX_DEV_INT_REG);

#if VERBOSE > SHOW_ERROR_MESSAGES
		udelay(ISL38XX_WRITEIO_DELAY);

		/* perform another read on the Device Status Register */
		reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
		do_gettimeofday(&current_time);
		DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
		      current_time.tv_sec, (long)current_time.tv_usec, reg);
#endif
	} else {
		/* device is (still) awake  */
#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_TRACING, "Device is in active state\n");
#endif
		/* trigger the device by setting the Update bit in the Device Int reg */

		isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
				  ISL38XX_DEV_INT_REG);
	}
}

void
isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
{
#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
#endif

	/* load the address of the control block in the device */
	isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
	udelay(ISL38XX_WRITEIO_DELAY);

	/* set the reset bit in the Device Interrupt Register */
	isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
	udelay(ISL38XX_WRITEIO_DELAY);

	/* enable the interrupt for detecting initialization */

	/* Note: Do not enable other interrupts here. We want the
	 * device to have come up first 100% before allowing any other
	 * interrupts. */
	isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
	udelay(ISL38XX_WRITEIO_DELAY);  /* allow complete full reset */
}

void
isl38xx_enable_common_interrupts(void __iomem *device_base)
{
	u32 reg;

	reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
	      ISL38XX_INT_IDENT_WAKEUP;
	isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
	udelay(ISL38XX_WRITEIO_DELAY);
}

int
isl38xx_in_queue(isl38xx_control_block *cb, int queue)
{
	const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
			   le32_to_cpu(cb->device_curr_frag[queue]));

	/* determine the amount of fragments in the queue depending on the type
	 * of the queue, either transmit or receive */

	BUG_ON(delta < 0);	/* driver ptr must be ahead of device ptr */

	switch (queue) {
		/* send queues */
	case ISL38XX_CB_TX_MGMTQ:
		BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);

	case ISL38XX_CB_TX_DATA_LQ:
	case ISL38XX_CB_TX_DATA_HQ:
		BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
		return delta;

		/* receive queues */
	case ISL38XX_CB_RX_MGMTQ:
		BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
		return ISL38XX_CB_MGMT_QSIZE - delta;

	case ISL38XX_CB_RX_DATA_LQ:
	case ISL38XX_CB_RX_DATA_HQ:
		BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
		return ISL38XX_CB_RX_QSIZE - delta;
	}
	BUG();
	return 0;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	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
4280db9d	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
1da177e4 LT	16	*
	17	*/
	18
1da177e4 LT	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	*
93b2dd12	39	* Instructs the device to disable all interrupt reporting by asserting
1da177e4 LT	40	* the IRQ line. New events may still show up in the interrupt identification
	41	* register located at offset %ISL38XX_INT_IDENT_REG.
	42	*/
	43	void
	44	isl38xx_disable_interrupts(void __iomem *device)
	45	{
	46	isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
	47	udelay(ISL38XX_WRITEIO_DELAY);
	48	}
	49
	50	void
	51	isl38xx_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
	86	void
	87	isl38xx_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
109	void
110	isl38xx_trigger_device(int asleep, void __iomem *device_base)
111	{
de7fe963	112	u32 reg;
1da177e4 LT	113
1da177e4 LT	114	#if VERBOSE > SHOW_ERROR_MESSAGES
de7fe963	115	u32 counter = 0;
05ab195c	116	struct timeval current_time;
1da177e4 LT	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(&current_time);
	125	DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
	126	current_time.tv_sec, (long)current_time.tv_usec);
1da177e4 LT	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));
05ab195c	131	#endif
1da177e4 LT	132
	133	reg = readl(device_base + ISL38XX_INT_IDENT_REG);
	134	if (reg == 0xabadface) {
	135	#if VERBOSE > SHOW_ERROR_MESSAGES
	136	do_gettimeofday(&current_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);
de7fe963	145	#if VERBOSE > SHOW_ERROR_MESSAGES
1da177e4	146	counter++;
de7fe963	147	#endif
1da177e4 LT	148	}
1da177e4 LT	149
05ab195c	150	#if VERBOSE > SHOW_ERROR_MESSAGES
1da177e4 LT	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));
1da177e4 LT	155	do_gettimeofday(&current_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);
cbf7c42b RW	165
cbf7c42b RW	166	#if VERBOSE > SHOW_ERROR_MESSAGES
1da177e4 LT	167	udelay(ISL38XX_WRITEIO_DELAY);
	168
	169	/* perform another read on the Device Status Register */
	170	reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
1da177e4 LT	171	do_gettimeofday(&current_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);
1da177e4 LT	184	}
	185	}
	186
	187	void
	188	isl38xx_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
93b2dd12	205	* device to have come up first 100% before allowing any other
1da177e4 LT	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
	211	void
93b2dd12 DT	212	isl38xx_enable_common_interrupts(void __iomem *device_base)
93b2dd12 DT	213	{
1da177e4	214	u32 reg;
93b2dd12 DT	215
	216	reg = ISL38XX_INT_IDENT_UPDATE \| ISL38XX_INT_IDENT_SLEEP \|
	217	ISL38XX_INT_IDENT_WAKEUP;
1da177e4 LT	218	isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
	219	udelay(ISL38XX_WRITEIO_DELAY);
	220	}
	221
	222	int
	223	isl38xx_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);
93b2dd12	237
1da177e4 LT	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;
1da177e4 LT	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;
1da177e4 LT	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;
1da177e4 LT	252	}
	253	BUG();
	254	return 0;
	255	}