drivers/media/mmc/siano/smssdio.c - linux - Git at Google

 /*
  *  smssdio.c - Siano 1xxx SDIO interface driver
  *
  *  Copyright 2008 Pierre Ossman
  *
  * Based on code by Siano Mobile Silicon, Inc.,
  * Copyright (C) 2006-2008, Uri Shkolnik
  *
  * 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, or (at
  * your option) any later version.
  *
  *
  * This hardware is a bit odd in that all transfers should be done
  * to/from the SMSSDIO_DATA register, yet the "increase address" bit
  * always needs to be set.
  *
  * Also, buffers from the card are always aligned to 128 byte
  * boundaries.
  */

 /*
  * General cleanup notes:
  *
  * - only typedefs should be name *_t
  *
  * - use ERR_PTR and friends for smscore_register_device()
  *
  * - smscore_getbuffer should zero fields
  *
  * Fix stop command
  */

 #include <linux/moduleparam.h>
 #include <linux/slab.h>
 #include <linux/firmware.h>
 #include <linux/delay.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/sdio_func.h>
 #include <linux/mmc/sdio_ids.h>
 #include <linux/module.h>

 #include "smscoreapi.h"
 #include "sms-cards.h"

 /* Registers */

 #define SMSSDIO_DATA		0x00
 #define SMSSDIO_INT		0x04
 #define SMSSDIO_BLOCK_SIZE	128

 static const struct sdio_device_id smssdio_ids[] __devinitconst = {
 	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_STELLAR),
 	 .driver_data = SMS1XXX_BOARD_SIANO_STELLAR},
 	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_A0),
 	 .driver_data = SMS1XXX_BOARD_SIANO_NOVA_A},
 	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_B0),
 	 .driver_data = SMS1XXX_BOARD_SIANO_NOVA_B},
 	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VEGA_A0),
 	 .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
 	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VENICE),
 	 .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
 	{ /* end: all zeroes */ },
 };

 MODULE_DEVICE_TABLE(sdio, smssdio_ids);

 struct smssdio_device {
 	struct sdio_func *func;

 	struct smscore_device_t *coredev;

 	struct smscore_buffer_t *split_cb;
 };

 /*******************************************************************/
 /* Siano core callbacks                                            */
 /*******************************************************************/

 static int smssdio_sendrequest(void *context, void *buffer, size_t size)
 {
 	int ret = 0;
 	struct smssdio_device *smsdev;

 	smsdev = context;

 	sdio_claim_host(smsdev->func);

 	while (size >= smsdev->func->cur_blksize) {
 		ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
 					buffer, smsdev->func->cur_blksize);
 		if (ret)
 			goto out;

 		buffer += smsdev->func->cur_blksize;
 		size -= smsdev->func->cur_blksize;
 	}

 	if (size) {
 		ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
 					buffer, size);
 	}

 out:
 	sdio_release_host(smsdev->func);

 	return ret;
 }

 /*******************************************************************/
 /* SDIO callbacks                                                  */
 /*******************************************************************/

 static void smssdio_interrupt(struct sdio_func *func)
 {
 	int ret;

 	struct smssdio_device *smsdev;
 	struct smscore_buffer_t *cb;
 	struct SmsMsgHdr_ST *hdr;
 	size_t size;

 	smsdev = sdio_get_drvdata(func);

 	/*
 	 * The interrupt register has no defined meaning. It is just
 	 * a way of turning of the level triggered interrupt.
 	 */
 	(void)sdio_readb(func, SMSSDIO_INT, &ret);
 	if (ret) {
 		sms_err("Unable to read interrupt register!\n");
 		return;
 	}

 	if (smsdev->split_cb == NULL) {
 		cb = smscore_getbuffer(smsdev->coredev);
 		if (!cb) {
 			sms_err("Unable to allocate data buffer!\n");
 			return;
 		}

 		ret = sdio_memcpy_fromio(smsdev->func,
 					 cb->p,
 					 SMSSDIO_DATA,
 					 SMSSDIO_BLOCK_SIZE);
 		if (ret) {
 			sms_err("Error %d reading initial block!\n", ret);
 			return;
 		}

 		hdr = cb->p;

 		if (hdr->msgFlags & MSG_HDR_FLAG_SPLIT_MSG) {
 			smsdev->split_cb = cb;
 			return;
 		}

 		if (hdr->msgLength > smsdev->func->cur_blksize)
 			size = hdr->msgLength - smsdev->func->cur_blksize;
 		else
 			size = 0;
 	} else {
 		cb = smsdev->split_cb;
 		hdr = cb->p;

 		size = hdr->msgLength - sizeof(struct SmsMsgHdr_ST);

 		smsdev->split_cb = NULL;
 	}

 	if (size) {
 		void *buffer;

 		buffer = cb->p + (hdr->msgLength - size);
 		size = ALIGN(size, SMSSDIO_BLOCK_SIZE);

 		BUG_ON(smsdev->func->cur_blksize != SMSSDIO_BLOCK_SIZE);

 		/*
 		 * First attempt to transfer all of it in one go...
 		 */
 		ret = sdio_memcpy_fromio(smsdev->func,
 					 buffer,
 					 SMSSDIO_DATA,
 					 size);
 		if (ret && ret != -EINVAL) {
 			smscore_putbuffer(smsdev->coredev, cb);
 			sms_err("Error %d reading data from card!\n", ret);
 			return;
 		}

 		/*
 		 * ..then fall back to one block at a time if that is
 		 * not possible...
 		 *
 		 * (we have to do this manually because of the
 		 * problem with the "increase address" bit)
 		 */
 		if (ret == -EINVAL) {
 			while (size) {
 				ret = sdio_memcpy_fromio(smsdev->func,
 						  buffer, SMSSDIO_DATA,
 						  smsdev->func->cur_blksize);
 				if (ret) {
 					smscore_putbuffer(smsdev->coredev, cb);
 					sms_err("Error %d reading "
 						"data from card!\n", ret);
 					return;
 				}

 				buffer += smsdev->func->cur_blksize;
 				if (size > smsdev->func->cur_blksize)
 					size -= smsdev->func->cur_blksize;
 				else
 					size = 0;
 			}
 		}
 	}

 	cb->size = hdr->msgLength;
 	cb->offset = 0;

 	smscore_onresponse(smsdev->coredev, cb);
 }

 static int __devinit smssdio_probe(struct sdio_func *func,
 			 const struct sdio_device_id *id)
 {
 	int ret;

 	int board_id;
 	struct smssdio_device *smsdev;
 	struct smsdevice_params_t params;

 	board_id = id->driver_data;

 	smsdev = kzalloc(sizeof(struct smssdio_device), GFP_KERNEL);
 	if (!smsdev)
 		return -ENOMEM;

 	smsdev->func = func;

 	memset(&params, 0, sizeof(struct smsdevice_params_t));

 	params.device = &func->dev;
 	params.buffer_size = 0x5000;	/* ?? */
 	params.num_buffers = 22;	/* ?? */
 	params.context = smsdev;

 	snprintf(params.devpath, sizeof(params.devpath),
 		 "sdio\\%s", sdio_func_id(func));

 	params.sendrequest_handler = smssdio_sendrequest;

 	params.device_type = sms_get_board(board_id)->type;

 	if (params.device_type != SMS_STELLAR)
 		params.flags |= SMS_DEVICE_FAMILY2;
 	else {
 		/*
 		 * FIXME: Stellar needs special handling...
 		 */
 		ret = -ENODEV;
 		goto free;
 	}

 	ret = smscore_register_device(&params, &smsdev->coredev);
 	if (ret < 0)
 		goto free;

 	smscore_set_board_id(smsdev->coredev, board_id);

 	sdio_claim_host(func);

 	ret = sdio_enable_func(func);
 	if (ret)
 		goto release;

 	ret = sdio_set_block_size(func, SMSSDIO_BLOCK_SIZE);
 	if (ret)
 		goto disable;

 	ret = sdio_claim_irq(func, smssdio_interrupt);
 	if (ret)
 		goto disable;

 	sdio_set_drvdata(func, smsdev);

 	sdio_release_host(func);

 	ret = smscore_start_device(smsdev->coredev);
 	if (ret < 0)
 		goto reclaim;

 	return 0;

 reclaim:
 	sdio_claim_host(func);
 	sdio_release_irq(func);
 disable:
 	sdio_disable_func(func);
 release:
 	sdio_release_host(func);
 	smscore_unregister_device(smsdev->coredev);
 free:
 	kfree(smsdev);

 	return ret;
 }

 static void smssdio_remove(struct sdio_func *func)
 {
 	struct smssdio_device *smsdev;

 	smsdev = sdio_get_drvdata(func);

 	/* FIXME: racy! */
 	if (smsdev->split_cb)
 		smscore_putbuffer(smsdev->coredev, smsdev->split_cb);

 	smscore_unregister_device(smsdev->coredev);

 	sdio_claim_host(func);
 	sdio_release_irq(func);
 	sdio_disable_func(func);
 	sdio_release_host(func);

 	kfree(smsdev);
 }

 static struct sdio_driver smssdio_driver = {
 	.name = "smssdio",
 	.id_table = smssdio_ids,
 	.probe = smssdio_probe,
 	.remove = smssdio_remove,
 };

 /*******************************************************************/
 /* Module functions                                                */
 /*******************************************************************/

 static int __init smssdio_module_init(void)
 {
 	int ret = 0;

 	printk(KERN_INFO "smssdio: Siano SMS1xxx SDIO driver\n");
 	printk(KERN_INFO "smssdio: Copyright Pierre Ossman\n");

 	ret = sdio_register_driver(&smssdio_driver);

 	return ret;
 }

 static void __exit smssdio_module_exit(void)
 {
 	sdio_unregister_driver(&smssdio_driver);
 }

 module_init(smssdio_module_init);
 module_exit(smssdio_module_exit);

 MODULE_DESCRIPTION("Siano SMS1xxx SDIO driver");
 MODULE_AUTHOR("Pierre Ossman");
 MODULE_LICENSE("GPL");
	/*
	* smssdio.c - Siano 1xxx SDIO interface driver
	*
	* Copyright 2008 Pierre Ossman
	*
	* Based on code by Siano Mobile Silicon, Inc.,
	* Copyright (C) 2006-2008, Uri Shkolnik
	*
	* 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, or (at
	* your option) any later version.
	*
	*
	* This hardware is a bit odd in that all transfers should be done
	* to/from the SMSSDIO_DATA register, yet the "increase address" bit
	* always needs to be set.
	*
	* Also, buffers from the card are always aligned to 128 byte
	* boundaries.
	*/

	/*
	* General cleanup notes:
	*
	* - only typedefs should be name *_t
	*
	* - use ERR_PTR and friends for smscore_register_device()
	*
	* - smscore_getbuffer should zero fields
	*
	* Fix stop command
	*/

	#include <linux/moduleparam.h>
	#include <linux/slab.h>
	#include <linux/firmware.h>
	#include <linux/delay.h>
	#include <linux/mmc/card.h>
	#include <linux/mmc/sdio_func.h>
	#include <linux/mmc/sdio_ids.h>
	#include <linux/module.h>

	#include "smscoreapi.h"
	#include "sms-cards.h"

	/* Registers */

	#define SMSSDIO_DATA 0x00
	#define SMSSDIO_INT 0x04
	#define SMSSDIO_BLOCK_SIZE 128

	static const struct sdio_device_id smssdio_ids[] __devinitconst = {
	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_STELLAR),
	.driver_data = SMS1XXX_BOARD_SIANO_STELLAR},
	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_A0),
	.driver_data = SMS1XXX_BOARD_SIANO_NOVA_A},
	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_B0),
	.driver_data = SMS1XXX_BOARD_SIANO_NOVA_B},
	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VEGA_A0),
	.driver_data = SMS1XXX_BOARD_SIANO_VEGA},
	{SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VENICE),
	.driver_data = SMS1XXX_BOARD_SIANO_VEGA},
	{ /* end: all zeroes */ },
	};

	MODULE_DEVICE_TABLE(sdio, smssdio_ids);

	struct smssdio_device {
	struct sdio_func *func;

	struct smscore_device_t *coredev;

	struct smscore_buffer_t *split_cb;
	};

	/*******************************************************************/
	/* Siano core callbacks */
	/*******************************************************************/

	static int smssdio_sendrequest(void context, void buffer, size_t size)
	{
	int ret = 0;
	struct smssdio_device *smsdev;

	smsdev = context;

	sdio_claim_host(smsdev->func);

	while (size >= smsdev->func->cur_blksize) {
	ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
	buffer, smsdev->func->cur_blksize);
	if (ret)
	goto out;

	buffer += smsdev->func->cur_blksize;
	size -= smsdev->func->cur_blksize;
	}

	if (size) {
	ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
	buffer, size);
	}

	out:
	sdio_release_host(smsdev->func);

	return ret;
	}

	/*******************************************************************/
	/* SDIO callbacks */
	/*******************************************************************/

	static void smssdio_interrupt(struct sdio_func *func)
	{
	int ret;

	struct smssdio_device *smsdev;
	struct smscore_buffer_t *cb;
	struct SmsMsgHdr_ST *hdr;
	size_t size;

	smsdev = sdio_get_drvdata(func);

	/*
	* The interrupt register has no defined meaning. It is just
	* a way of turning of the level triggered interrupt.
	*/
	(void)sdio_readb(func, SMSSDIO_INT, &ret);
	if (ret) {
	sms_err("Unable to read interrupt register!\n");
	return;
	}

	if (smsdev->split_cb == NULL) {
	cb = smscore_getbuffer(smsdev->coredev);
	if (!cb) {
	sms_err("Unable to allocate data buffer!\n");
	return;
	}

	ret = sdio_memcpy_fromio(smsdev->func,
	cb->p,
	SMSSDIO_DATA,
	SMSSDIO_BLOCK_SIZE);
	if (ret) {
	sms_err("Error %d reading initial block!\n", ret);
	return;
	}

	hdr = cb->p;

	if (hdr->msgFlags & MSG_HDR_FLAG_SPLIT_MSG) {
	smsdev->split_cb = cb;
	return;
	}

	if (hdr->msgLength > smsdev->func->cur_blksize)
	size = hdr->msgLength - smsdev->func->cur_blksize;
	else
	size = 0;
	} else {
	cb = smsdev->split_cb;
	hdr = cb->p;

	size = hdr->msgLength - sizeof(struct SmsMsgHdr_ST);

	smsdev->split_cb = NULL;
	}

	if (size) {
	void *buffer;

	buffer = cb->p + (hdr->msgLength - size);
	size = ALIGN(size, SMSSDIO_BLOCK_SIZE);

	BUG_ON(smsdev->func->cur_blksize != SMSSDIO_BLOCK_SIZE);

	/*
	* First attempt to transfer all of it in one go...
	*/
	ret = sdio_memcpy_fromio(smsdev->func,
	buffer,
	SMSSDIO_DATA,
	size);
	if (ret && ret != -EINVAL) {
	smscore_putbuffer(smsdev->coredev, cb);
	sms_err("Error %d reading data from card!\n", ret);
	return;
	}

	/*
	* ..then fall back to one block at a time if that is
	* not possible...
	*
	* (we have to do this manually because of the
	* problem with the "increase address" bit)
	*/
	if (ret == -EINVAL) {
	while (size) {
	ret = sdio_memcpy_fromio(smsdev->func,
	buffer, SMSSDIO_DATA,
	smsdev->func->cur_blksize);
	if (ret) {
	smscore_putbuffer(smsdev->coredev, cb);
	sms_err("Error %d reading "
	"data from card!\n", ret);
	return;
	}

	buffer += smsdev->func->cur_blksize;
	if (size > smsdev->func->cur_blksize)
	size -= smsdev->func->cur_blksize;
	else
	size = 0;
	}
	}
	}

	cb->size = hdr->msgLength;
	cb->offset = 0;

	smscore_onresponse(smsdev->coredev, cb);
	}

	static int __devinit smssdio_probe(struct sdio_func *func,
	const struct sdio_device_id *id)
	{
	int ret;

	int board_id;
	struct smssdio_device *smsdev;
	struct smsdevice_params_t params;

	board_id = id->driver_data;

	smsdev = kzalloc(sizeof(struct smssdio_device), GFP_KERNEL);
	if (!smsdev)
	return -ENOMEM;

	smsdev->func = func;

	memset(&params, 0, sizeof(struct smsdevice_params_t));

	params.device = &func->dev;
	params.buffer_size = 0x5000; /* ?? */
	params.num_buffers = 22; /* ?? */
	params.context = smsdev;

	snprintf(params.devpath, sizeof(params.devpath),
	"sdio\\%s", sdio_func_id(func));

	params.sendrequest_handler = smssdio_sendrequest;

	params.device_type = sms_get_board(board_id)->type;

	if (params.device_type != SMS_STELLAR)
	params.flags \|= SMS_DEVICE_FAMILY2;
	else {
	/*
	* FIXME: Stellar needs special handling...
	*/
	ret = -ENODEV;
	goto free;
	}

	ret = smscore_register_device(&params, &smsdev->coredev);
	if (ret < 0)
	goto free;

	smscore_set_board_id(smsdev->coredev, board_id);

	sdio_claim_host(func);

	ret = sdio_enable_func(func);
	if (ret)
	goto release;

	ret = sdio_set_block_size(func, SMSSDIO_BLOCK_SIZE);
	if (ret)
	goto disable;

	ret = sdio_claim_irq(func, smssdio_interrupt);
	if (ret)
	goto disable;

	sdio_set_drvdata(func, smsdev);

	sdio_release_host(func);

	ret = smscore_start_device(smsdev->coredev);
	if (ret < 0)
	goto reclaim;

	return 0;

	reclaim:
	sdio_claim_host(func);
	sdio_release_irq(func);
	disable:
	sdio_disable_func(func);
	release:
	sdio_release_host(func);
	smscore_unregister_device(smsdev->coredev);
	free:
	kfree(smsdev);

	return ret;
	}

	static void smssdio_remove(struct sdio_func *func)
	{
	struct smssdio_device *smsdev;

	smsdev = sdio_get_drvdata(func);

	/* FIXME: racy! */
	if (smsdev->split_cb)
	smscore_putbuffer(smsdev->coredev, smsdev->split_cb);

	smscore_unregister_device(smsdev->coredev);

	sdio_claim_host(func);
	sdio_release_irq(func);
	sdio_disable_func(func);
	sdio_release_host(func);

	kfree(smsdev);
	}

	static struct sdio_driver smssdio_driver = {
	.name = "smssdio",
	.id_table = smssdio_ids,
	.probe = smssdio_probe,
	.remove = smssdio_remove,
	};

	/*******************************************************************/
	/* Module functions */
	/*******************************************************************/

	static int __init smssdio_module_init(void)
	{
	int ret = 0;

	printk(KERN_INFO "smssdio: Siano SMS1xxx SDIO driver\n");
	printk(KERN_INFO "smssdio: Copyright Pierre Ossman\n");

	ret = sdio_register_driver(&smssdio_driver);

	return ret;
	}

	static void __exit smssdio_module_exit(void)
	{
	sdio_unregister_driver(&smssdio_driver);
	}

	module_init(smssdio_module_init);
	module_exit(smssdio_module_exit);

	MODULE_DESCRIPTION("Siano SMS1xxx SDIO driver");
	MODULE_AUTHOR("Pierre Ossman");
	MODULE_LICENSE("GPL");