[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / sysdev / bestcomm / bestcomm.c

/*
 * Driver for MPC52xx processor BestComm peripheral controller
 *
 *
 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2005      Varma Electronics Oy,
 *                         ( by Andrey Volkov <avolkov@varma-el.com> )
 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mpc52xx.h>

#include "sram.h"
#include "bestcomm_priv.h"
#include "bestcomm.h"

#define DRIVER_NAME "bestcomm-core"

/* MPC5200 device tree match tables */
static struct of_device_id mpc52xx_sram_ids[] __devinitdata = {
	{ .compatible = "fsl,mpc5200-sram", },
	{ .compatible = "mpc5200-sram", },
	{}
};


struct bcom_engine *bcom_eng = NULL;
EXPORT_SYMBOL_GPL(bcom_eng);	/* needed for inline functions */

/* ======================================================================== */
/* Public and private API                                                   */
/* ======================================================================== */

/* Private API */

struct bcom_task *
bcom_task_alloc(int bd_count, int bd_size, int priv_size)
{
	int i, tasknum = -1;
	struct bcom_task *tsk;

	/* Don't try to do anything if bestcomm init failed */
	if (!bcom_eng)
		return NULL;

	/* Get and reserve a task num */
	spin_lock(&bcom_eng->lock);

	for (i=0; i<BCOM_MAX_TASKS; i++)
		if (!bcom_eng->tdt[i].stop) {	/* we use stop as a marker */
			bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
			tasknum = i;
			break;
		}

	spin_unlock(&bcom_eng->lock);

	if (tasknum < 0)
		return NULL;

	/* Allocate our structure */
	tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
	if (!tsk)
		goto error;

	tsk->tasknum = tasknum;
	if (priv_size)
		tsk->priv = (void*)tsk + sizeof(struct bcom_task);

	/* Get IRQ of that task */
	tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
	if (tsk->irq == NO_IRQ)
		goto error;

	/* Init the BDs, if needed */
	if (bd_count) {
		tsk->cookie = kmalloc(sizeof(void*) * bd_count, GFP_KERNEL);
		if (!tsk->cookie)
			goto error;

		tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
		if (!tsk->bd)
			goto error;
		memset(tsk->bd, 0x00, bd_count * bd_size);

		tsk->num_bd = bd_count;
		tsk->bd_size = bd_size;
	}

	return tsk;

error:
	if (tsk) {
		if (tsk->irq != NO_IRQ)
			irq_dispose_mapping(tsk->irq);
		bcom_sram_free(tsk->bd);
		kfree(tsk->cookie);
		kfree(tsk);
	}

	bcom_eng->tdt[tasknum].stop = 0;

	return NULL;
}
EXPORT_SYMBOL_GPL(bcom_task_alloc);

void
bcom_task_free(struct bcom_task *tsk)
{
	/* Stop the task */
	bcom_disable_task(tsk->tasknum);

	/* Clear TDT */
	bcom_eng->tdt[tsk->tasknum].start = 0;
	bcom_eng->tdt[tsk->tasknum].stop  = 0;

	/* Free everything */
	irq_dispose_mapping(tsk->irq);
	bcom_sram_free(tsk->bd);
	kfree(tsk->cookie);
	kfree(tsk);
}
EXPORT_SYMBOL_GPL(bcom_task_free);

int
bcom_load_image(int task, u32 *task_image)
{
	struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
	struct bcom_tdt *tdt;
	u32 *desc, *var, *inc;
	u32 *desc_src, *var_src, *inc_src;

	/* Safety checks */
	if (hdr->magic != BCOM_TASK_MAGIC) {
		printk(KERN_ERR DRIVER_NAME
			": Trying to load invalid microcode\n");
		return -EINVAL;
	}

	if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
		printk(KERN_ERR DRIVER_NAME
			": Trying to load invalid task %d\n", task);
		return -EINVAL;
	}

	/* Initial load or reload */
	tdt = &bcom_eng->tdt[task];

	if (tdt->start) {
		desc = bcom_task_desc(task);
		if (hdr->desc_size != bcom_task_num_descs(task)) {
			printk(KERN_ERR DRIVER_NAME
				": Trying to reload wrong task image "
				"(%d size %d/%d)!\n",
				task,
				hdr->desc_size,
				bcom_task_num_descs(task));
			return -EINVAL;
		}
	} else {
		phys_addr_t start_pa;

		desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
		if (!desc)
			return -ENOMEM;

		tdt->start = start_pa;
		tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
	}

	var = bcom_task_var(task);
	inc = bcom_task_inc(task);

	/* Clear & copy */
	memset(var, 0x00, BCOM_VAR_SIZE);
	memset(inc, 0x00, BCOM_INC_SIZE);

	desc_src = (u32 *)(hdr + 1);
	var_src = desc_src + hdr->desc_size;
	inc_src = var_src + hdr->var_size;

	memcpy(desc, desc_src, hdr->desc_size * sizeof(u32));
	memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
	memcpy(inc, inc_src, hdr->inc_size * sizeof(u32));

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_load_image);

void
bcom_set_initiator(int task, int initiator)
{
	int i;
	int num_descs;
	u32 *desc;
	int next_drd_has_initiator;

	bcom_set_tcr_initiator(task, initiator);

	/* Just setting tcr is apparently not enough due to some problem */
	/* with it. So we just go thru all the microcode and replace in  */
	/* the DRD directly */

	desc = bcom_task_desc(task);
	next_drd_has_initiator = 1;
	num_descs = bcom_task_num_descs(task);

	for (i=0; i<num_descs; i++, desc++) {
		if (!bcom_desc_is_drd(*desc))
			continue;
		if (next_drd_has_initiator)
			if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
				bcom_set_desc_initiator(desc, initiator);
		next_drd_has_initiator = !bcom_drd_is_extended(*desc);
	}
}
EXPORT_SYMBOL_GPL(bcom_set_initiator);


/* Public API */

void
bcom_enable(struct bcom_task *tsk)
{
	bcom_enable_task(tsk->tasknum);
}
EXPORT_SYMBOL_GPL(bcom_enable);

void
bcom_disable(struct bcom_task *tsk)
{
	bcom_disable_task(tsk->tasknum);
}
EXPORT_SYMBOL_GPL(bcom_disable);


/* ======================================================================== */
/* Engine init/cleanup                                                      */
/* ======================================================================== */

/* Function Descriptor table */
/* this will need to be updated if Freescale changes their task code FDT */
static u32 fdt_ops[] = {
	0xa0045670,	/* FDT[48] - load_acc()	  */
	0x80045670,	/* FDT[49] - unload_acc() */
	0x21800000,	/* FDT[50] - and()        */
	0x21e00000,	/* FDT[51] - or()         */
	0x21500000,	/* FDT[52] - xor()        */
	0x21400000,	/* FDT[53] - andn()       */
	0x21500000,	/* FDT[54] - not()        */
	0x20400000,	/* FDT[55] - add()        */
	0x20500000,	/* FDT[56] - sub()        */
	0x20800000,	/* FDT[57] - lsh()        */
	0x20a00000,	/* FDT[58] - rsh()        */
	0xc0170000,	/* FDT[59] - crc8()       */
	0xc0145670,	/* FDT[60] - crc16()      */
	0xc0345670,	/* FDT[61] - crc32()      */
	0xa0076540,	/* FDT[62] - endian32()   */
	0xa0000760,	/* FDT[63] - endian16()   */
};


static int __devinit
bcom_engine_init(void)
{
	int task;
	phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
	unsigned int tdt_size, ctx_size, var_size, fdt_size;

	/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
	tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
	ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
	var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
	fdt_size = BCOM_FDT_SIZE;

	bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
	bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
	bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
	bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);

	if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
		printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");

		bcom_sram_free(bcom_eng->tdt);
		bcom_sram_free(bcom_eng->ctx);
		bcom_sram_free(bcom_eng->var);
		bcom_sram_free(bcom_eng->fdt);

		return -ENOMEM;
	}

	memset(bcom_eng->tdt, 0x00, tdt_size);
	memset(bcom_eng->ctx, 0x00, ctx_size);
	memset(bcom_eng->var, 0x00, var_size);
	memset(bcom_eng->fdt, 0x00, fdt_size);

	/* Copy the FDT for the EU#3 */
	memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));

	/* Initialize Task base structure */
	for (task=0; task<BCOM_MAX_TASKS; task++)
	{
		out_be16(&bcom_eng->regs->tcr[task], 0);
		out_8(&bcom_eng->regs->ipr[task], 0);

		bcom_eng->tdt[task].context	= ctx_pa;
		bcom_eng->tdt[task].var	= var_pa;
		bcom_eng->tdt[task].fdt	= fdt_pa;

		var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
		ctx_pa += BCOM_CTX_SIZE;
	}

	out_be32(&bcom_eng->regs->taskBar, tdt_pa);

	/* Init 'always' initiator */
	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);

	/* Disable COMM Bus Prefetch on the original 5200; it's broken */
	if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
		bcom_disable_prefetch();

	/* Init lock */
	spin_lock_init(&bcom_eng->lock);

	return 0;
}

static void
bcom_engine_cleanup(void)
{
	int task;

	/* Stop all tasks */
	for (task=0; task<BCOM_MAX_TASKS; task++)
	{
		out_be16(&bcom_eng->regs->tcr[task], 0);
		out_8(&bcom_eng->regs->ipr[task], 0);
	}

	out_be32(&bcom_eng->regs->taskBar, 0ul);

	/* Release the SRAM zones */
	bcom_sram_free(bcom_eng->tdt);
	bcom_sram_free(bcom_eng->ctx);
	bcom_sram_free(bcom_eng->var);
	bcom_sram_free(bcom_eng->fdt);
}


/* ======================================================================== */
/* OF platform driver                                                       */
/* ======================================================================== */

static int __devinit
mpc52xx_bcom_probe(struct of_device *op, const struct of_device_id *match)
{
	struct device_node *ofn_sram;
	struct resource res_bcom;

	int rv;

	/* Inform user we're ok so far */
	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");

	/* Get the bestcomm node */
	of_node_get(op->node);

	/* Prepare SRAM */
	ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
	if (!ofn_sram) {
		printk(KERN_ERR DRIVER_NAME ": "
			"No SRAM found in device tree\n");
		rv = -ENODEV;
		goto error_ofput;
	}
	rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
	of_node_put(ofn_sram);

	if (rv) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Error in SRAM init\n");
		goto error_ofput;
	}

	/* Get a clean struct */
	bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
	if (!bcom_eng) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't allocate state structure\n");
		rv = -ENOMEM;
		goto error_sramclean;
	}

	/* Save the node */
	bcom_eng->ofnode = op->node;

	/* Get, reserve & map io */
	if (of_address_to_resource(op->node, 0, &res_bcom)) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't get resource\n");
		rv = -EINVAL;
		goto error_sramclean;
	}

	if (!request_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma),
				DRIVER_NAME)) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't request registers region\n");
		rv = -EBUSY;
		goto error_sramclean;
	}

	bcom_eng->regs_base = res_bcom.start;
	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
	if (!bcom_eng->regs) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't map registers\n");
		rv = -ENOMEM;
		goto error_release;
	}

	/* Now, do the real init */
	rv = bcom_engine_init();
	if (rv)
		goto error_unmap;

	/* Done ! */
	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
		(long)bcom_eng->regs_base);

	return 0;

	/* Error path */
error_unmap:
	iounmap(bcom_eng->regs);
error_release:
	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
error_sramclean:
	kfree(bcom_eng);
	bcom_sram_cleanup();
error_ofput:
	of_node_put(op->node);

	printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");

	return rv;
}


static int
mpc52xx_bcom_remove(struct of_device *op)
{
	/* Clean up the engine */
	bcom_engine_cleanup();

	/* Cleanup SRAM */
	bcom_sram_cleanup();

	/* Release regs */
	iounmap(bcom_eng->regs);
	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));

	/* Release the node */
	of_node_put(bcom_eng->ofnode);

	/* Release memory */
	kfree(bcom_eng);
	bcom_eng = NULL;

	return 0;
}

static struct of_device_id mpc52xx_bcom_of_match[] = {
	{ .compatible = "fsl,mpc5200-bestcomm", },
	{ .compatible = "mpc5200-bestcomm", },
	{},
};

MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);


static struct of_platform_driver mpc52xx_bcom_of_platform_driver = {
	.owner		= THIS_MODULE,
	.name		= DRIVER_NAME,
	.match_table	= mpc52xx_bcom_of_match,
	.probe		= mpc52xx_bcom_probe,
	.remove		= mpc52xx_bcom_remove,
	.driver		= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
};


/* ======================================================================== */
/* Module                                                                   */
/* ======================================================================== */

static int __init
mpc52xx_bcom_init(void)
{
	return of_register_platform_driver(&mpc52xx_bcom_of_platform_driver);
}

static void __exit
mpc52xx_bcom_exit(void)
{
	of_unregister_platform_driver(&mpc52xx_bcom_of_platform_driver);
}

/* If we're not a module, we must make sure everything is setup before  */
/* anyone tries to use us ... that's why we use subsys_initcall instead */
/* of module_init. */
subsys_initcall(mpc52xx_bcom_init);
module_exit(mpc52xx_bcom_exit);

MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2f9ea1bd SM	1	/*
	2	* Driver for MPC52xx processor BestComm peripheral controller
	3	*
	4	*
	5	* Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
	6	* Copyright (C) 2005 Varma Electronics Oy,
	7	* ( by Andrey Volkov <avolkov@varma-el.com> )
	8	* Copyright (C) 2003-2004 MontaVista, Software, Inc.
	9	* ( by Dale Farnsworth <dfarnsworth@mvista.com> )
	10	*
	11	* This file is licensed under the terms of the GNU General Public License
	12	* version 2. This program is licensed "as is" without any warranty of any
	13	* kind, whether express or implied.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18	#include <linux/slab.h>
	19	#include <linux/of.h>
	20	#include <linux/of_device.h>
	21	#include <linux/of_platform.h>
	22	#include <asm/io.h>
	23	#include <asm/irq.h>
	24	#include <asm/mpc52xx.h>
	25
	26	#include "sram.h"
	27	#include "bestcomm_priv.h"
	28	#include "bestcomm.h"
	29
	30	#define DRIVER_NAME "bestcomm-core"
	31
66ffbe49 GL	32	/* MPC5200 device tree match tables */
	33	static struct of_device_id mpc52xx_sram_ids[] __devinitdata = {
	34	{ .compatible = "fsl,mpc5200-sram", },
	35	{ .compatible = "mpc5200-sram", },
	36	{}
	37	};
	38
2f9ea1bd SM	39
	40	struct bcom_engine *bcom_eng = NULL;
	41	EXPORT_SYMBOL_GPL(bcom_eng); /* needed for inline functions */
	42
2f9ea1bd SM	43	/* ======================================================================== */
	44	/* Public and private API */
	45	/* ======================================================================== */
	46
	47	/* Private API */
	48
	49	struct bcom_task *
	50	bcom_task_alloc(int bd_count, int bd_size, int priv_size)
	51	{
	52	int i, tasknum = -1;
	53	struct bcom_task *tsk;
	54
9560aea4 GL	55	/* Don't try to do anything if bestcomm init failed */
	56	if (!bcom_eng)
	57	return NULL;
	58
2f9ea1bd SM	59	/* Get and reserve a task num */
	60	spin_lock(&bcom_eng->lock);
	61
	62	for (i=0; i<BCOM_MAX_TASKS; i++)
	63	if (!bcom_eng->tdt[i].stop) { /* we use stop as a marker */
	64	bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
	65	tasknum = i;
	66	break;
	67	}
	68
	69	spin_unlock(&bcom_eng->lock);
	70
	71	if (tasknum < 0)
	72	return NULL;
	73
	74	/* Allocate our structure */
	75	tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
	76	if (!tsk)
	77	goto error;
	78
	79	tsk->tasknum = tasknum;
	80	if (priv_size)
	81	tsk->priv = (void*)tsk + sizeof(struct bcom_task);
	82
	83	/* Get IRQ of that task */
	84	tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
	85	if (tsk->irq == NO_IRQ)
	86	goto error;
	87
	88	/* Init the BDs, if needed */
	89	if (bd_count) {
	90	tsk->cookie = kmalloc(sizeof(void) bd_count, GFP_KERNEL);
	91	if (!tsk->cookie)
	92	goto error;
	93
	94	tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
	95	if (!tsk->bd)
	96	goto error;
	97	memset(tsk->bd, 0x00, bd_count * bd_size);
	98
	99	tsk->num_bd = bd_count;
	100	tsk->bd_size = bd_size;
	101	}
	102
	103	return tsk;
	104
	105	error:
	106	if (tsk) {
	107	if (tsk->irq != NO_IRQ)
	108	irq_dispose_mapping(tsk->irq);
	109	bcom_sram_free(tsk->bd);
	110	kfree(tsk->cookie);
	111	kfree(tsk);
	112	}
	113
	114	bcom_eng->tdt[tasknum].stop = 0;
	115
	116	return NULL;
	117	}
	118	EXPORT_SYMBOL_GPL(bcom_task_alloc);
	119
	120	void
	121	bcom_task_free(struct bcom_task *tsk)
	122	{
123	/* Stop the task */
124	bcom_disable_task(tsk->tasknum);
125
126	/* Clear TDT */
127	bcom_eng->tdt[tsk->tasknum].start = 0;
128	bcom_eng->tdt[tsk->tasknum].stop = 0;
129
130	/* Free everything */
131	irq_dispose_mapping(tsk->irq);
132	bcom_sram_free(tsk->bd);
133	kfree(tsk->cookie);
134	kfree(tsk);
135	}
136	EXPORT_SYMBOL_GPL(bcom_task_free);
137
138	int
139	bcom_load_image(int task, u32 *task_image)
140	{
141	struct bcom_task_header hdr = (struct bcom_task_header )task_image;
142	struct bcom_tdt *tdt;
143	u32 desc, var, *inc;
144	u32 desc_src, var_src, *inc_src;
145
146	/* Safety checks */
147	if (hdr->magic != BCOM_TASK_MAGIC) {
148	printk(KERN_ERR DRIVER_NAME
149	": Trying to load invalid microcode\n");
150	return -EINVAL;
151	}
152
153	if ((task < 0) \|\| (task >= BCOM_MAX_TASKS)) {
154	printk(KERN_ERR DRIVER_NAME
155	": Trying to load invalid task %d\n", task);
156	return -EINVAL;
157	}
158
159	/* Initial load or reload */
160	tdt = &bcom_eng->tdt[task];
161
162	if (tdt->start) {
163	desc = bcom_task_desc(task);
164	if (hdr->desc_size != bcom_task_num_descs(task)) {
165	printk(KERN_ERR DRIVER_NAME
166	": Trying to reload wrong task image "
167	"(%d size %d/%d)!\n",
168	task,
169	hdr->desc_size,
170	bcom_task_num_descs(task));
171	return -EINVAL;
172	}
173	} else {
174	phys_addr_t start_pa;
175
176	desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
177	if (!desc)
178	return -ENOMEM;
179
180	tdt->start = start_pa;
181	tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
182	}
183
184	var = bcom_task_var(task);
185	inc = bcom_task_inc(task);
186
187	/* Clear & copy */
188	memset(var, 0x00, BCOM_VAR_SIZE);
189	memset(inc, 0x00, BCOM_INC_SIZE);
190
191	desc_src = (u32 *)(hdr + 1);
192	var_src = desc_src + hdr->desc_size;
193	inc_src = var_src + hdr->var_size;
194
195	memcpy(desc, desc_src, hdr->desc_size * sizeof(u32));
196	memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
197	memcpy(inc, inc_src, hdr->inc_size * sizeof(u32));
198
199	return 0;
200	}
201	EXPORT_SYMBOL_GPL(bcom_load_image);
202
203	void
204	bcom_set_initiator(int task, int initiator)
205	{
206	int i;
207	int num_descs;
208	u32 *desc;
209	int next_drd_has_initiator;
210
211	bcom_set_tcr_initiator(task, initiator);
212
213	/* Just setting tcr is apparently not enough due to some problem */
214	/* with it. So we just go thru all the microcode and replace in */
215	/* the DRD directly */
216
217	desc = bcom_task_desc(task);
218	next_drd_has_initiator = 1;
219	num_descs = bcom_task_num_descs(task);
220
221	for (i=0; i<num_descs; i++, desc++) {
222	if (!bcom_desc_is_drd(*desc))
223	continue;
224	if (next_drd_has_initiator)
225	if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
226	bcom_set_desc_initiator(desc, initiator);
227	next_drd_has_initiator = !bcom_drd_is_extended(*desc);
228	}
229	}
230	EXPORT_SYMBOL_GPL(bcom_set_initiator);
231
232
233	/* Public API */
234
235	void
236	bcom_enable(struct bcom_task *tsk)
237	{
238	bcom_enable_task(tsk->tasknum);
239	}
240	EXPORT_SYMBOL_GPL(bcom_enable);
241
242	void
243	bcom_disable(struct bcom_task *tsk)
244	{
245	bcom_disable_task(tsk->tasknum);
246	}
247	EXPORT_SYMBOL_GPL(bcom_disable);
248
249
250	/* ======================================================================== */
251	/* Engine init/cleanup */
252	/* ======================================================================== */
253
254	/* Function Descriptor table */
255	/* this will need to be updated if Freescale changes their task code FDT */
256	static u32 fdt_ops[] = {
257	0xa0045670, /* FDT[48] - load_acc() */
258	0x80045670, /* FDT[49] - unload_acc() */
259	0x21800000, /* FDT[50] - and() */
260	0x21e00000, /* FDT[51] - or() */
261	0x21500000, /* FDT[52] - xor() */
262	0x21400000, /* FDT[53] - andn() */
263	0x21500000, /* FDT[54] - not() */
264	0x20400000, /* FDT[55] - add() */
265	0x20500000, /* FDT[56] - sub() */
266	0x20800000, /* FDT[57] - lsh() */
267	0x20a00000, /* FDT[58] - rsh() */
268	0xc0170000, /* FDT[59] - crc8() */
269	0xc0145670, /* FDT[60] - crc16() */
270	0xc0345670, /* FDT[61] - crc32() */
271	0xa0076540, /* FDT[62] - endian32() */
272	0xa0000760, /* FDT[63] - endian16() */
273	};
274
275
276	static int __devinit
277	bcom_engine_init(void)
278	{
279	int task;
280	phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
281	unsigned int tdt_size, ctx_size, var_size, fdt_size;
282
283	/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
284	tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
285	ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
286	var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
287	fdt_size = BCOM_FDT_SIZE;
288
289	bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
290	bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
291	bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
292	bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);
293
294	if (!bcom_eng->tdt \|\| !bcom_eng->ctx \|\| !bcom_eng->var \|\| !bcom_eng->fdt) {
295	printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");
296
297	bcom_sram_free(bcom_eng->tdt);
298	bcom_sram_free(bcom_eng->ctx);
299	bcom_sram_free(bcom_eng->var);
300	bcom_sram_free(bcom_eng->fdt);
301
302	return -ENOMEM;
303	}
304
305	memset(bcom_eng->tdt, 0x00, tdt_size);
306	memset(bcom_eng->ctx, 0x00, ctx_size);
307	memset(bcom_eng->var, 0x00, var_size);
308	memset(bcom_eng->fdt, 0x00, fdt_size);
309
310	/* Copy the FDT for the EU#3 */
311	memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));
312
313	/* Initialize Task base structure */
314	for (task=0; task<BCOM_MAX_TASKS; task++)
315	{
316	out_be16(&bcom_eng->regs->tcr[task], 0);
317	out_8(&bcom_eng->regs->ipr[task], 0);
318
319	bcom_eng->tdt[task].context = ctx_pa;
320	bcom_eng->tdt[task].var = var_pa;
321	bcom_eng->tdt[task].fdt = fdt_pa;
322
323	var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
324	ctx_pa += BCOM_CTX_SIZE;
325	}
326
327	out_be32(&bcom_eng->regs->taskBar, tdt_pa);
328
329	/* Init 'always' initiator */
330	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
331
c052a22e	332	/* Disable COMM Bus Prefetch on the original 5200; it's broken */
aaab5e83 GL	333	if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
aaab5e83 GL	334	bcom_disable_prefetch();
2f9ea1bd SM	335
	336	/* Init lock */
	337	spin_lock_init(&bcom_eng->lock);
	338
	339	return 0;
	340	}
	341
	342	static void
	343	bcom_engine_cleanup(void)
	344	{
	345	int task;
	346
	347	/* Stop all tasks */
	348	for (task=0; task<BCOM_MAX_TASKS; task++)
	349	{
	350	out_be16(&bcom_eng->regs->tcr[task], 0);
	351	out_8(&bcom_eng->regs->ipr[task], 0);
	352	}
	353
	354	out_be32(&bcom_eng->regs->taskBar, 0ul);
	355
	356	/* Release the SRAM zones */
	357	bcom_sram_free(bcom_eng->tdt);
	358	bcom_sram_free(bcom_eng->ctx);
	359	bcom_sram_free(bcom_eng->var);
	360	bcom_sram_free(bcom_eng->fdt);
	361	}
	362
	363
	364	/* ======================================================================== */
	365	/* OF platform driver */
	366	/* ======================================================================== */
	367
	368	static int __devinit
	369	mpc52xx_bcom_probe(struct of_device op, const struct of_device_id match)
	370	{
	371	struct device_node *ofn_sram;
	372	struct resource res_bcom;
	373
	374	int rv;
	375
	376	/* Inform user we're ok so far */
	377	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
	378
	379	/* Get the bestcomm node */
	380	of_node_get(op->node);
	381
	382	/* Prepare SRAM */
66ffbe49	383	ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
2f9ea1bd SM	384	if (!ofn_sram) {
	385	printk(KERN_ERR DRIVER_NAME ": "
	386	"No SRAM found in device tree\n");
	387	rv = -ENODEV;
	388	goto error_ofput;
	389	}
	390	rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
	391	of_node_put(ofn_sram);
	392
	393	if (rv) {
	394	printk(KERN_ERR DRIVER_NAME ": "
	395	"Error in SRAM init\n");
	396	goto error_ofput;
	397	}
	398
	399	/* Get a clean struct */
	400	bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
	401	if (!bcom_eng) {
	402	printk(KERN_ERR DRIVER_NAME ": "
	403	"Can't allocate state structure\n");
	404	rv = -ENOMEM;
	405	goto error_sramclean;
	406	}
	407
	408	/* Save the node */
	409	bcom_eng->ofnode = op->node;
	410
	411	/* Get, reserve & map io */
	412	if (of_address_to_resource(op->node, 0, &res_bcom)) {
	413	printk(KERN_ERR DRIVER_NAME ": "
	414	"Can't get resource\n");
	415	rv = -EINVAL;
	416	goto error_sramclean;
	417	}
	418
	419	if (!request_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma),
	420	DRIVER_NAME)) {
	421	printk(KERN_ERR DRIVER_NAME ": "
	422	"Can't request registers region\n");
	423	rv = -EBUSY;
	424	goto error_sramclean;
	425	}
	426
	427	bcom_eng->regs_base = res_bcom.start;
	428	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
	429	if (!bcom_eng->regs) {
	430	printk(KERN_ERR DRIVER_NAME ": "
	431	"Can't map registers\n");
	432	rv = -ENOMEM;
	433	goto error_release;
	434	}
	435
	436	/* Now, do the real init */
	437	rv = bcom_engine_init();
	438	if (rv)
	439	goto error_unmap;
	440
	441	/* Done ! */
	442	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
08b6c06d	443	(long)bcom_eng->regs_base);
2f9ea1bd SM	444
	445	return 0;
	446
	447	/* Error path */
	448	error_unmap:
	449	iounmap(bcom_eng->regs);
	450	error_release:
	451	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
	452	error_sramclean:
	453	kfree(bcom_eng);
	454	bcom_sram_cleanup();
	455	error_ofput:
	456	of_node_put(op->node);
	457
	458	printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");
	459
	460	return rv;
	461	}
	462
	463
	464	static int
	465	mpc52xx_bcom_remove(struct of_device *op)
	466	{
	467	/* Clean up the engine */
	468	bcom_engine_cleanup();
	469
	470	/* Cleanup SRAM */
	471	bcom_sram_cleanup();
	472
	473	/* Release regs */
	474	iounmap(bcom_eng->regs);
	475	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
	476
	477	/* Release the node */
	478	of_node_put(bcom_eng->ofnode);
	479
	480	/* Release memory */
	481	kfree(bcom_eng);
	482	bcom_eng = NULL;
	483
	484	return 0;
	485	}
	486
	487	static struct of_device_id mpc52xx_bcom_of_match[] = {
7ea6fd7e AG	488	{ .compatible = "fsl,mpc5200-bestcomm", },
7ea6fd7e AG	489	{ .compatible = "mpc5200-bestcomm", },
2f9ea1bd SM	490	{},
	491	};
	492
	493	MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);
	494
	495
	496	static struct of_platform_driver mpc52xx_bcom_of_platform_driver = {
	497	.owner = THIS_MODULE,
	498	.name = DRIVER_NAME,
	499	.match_table = mpc52xx_bcom_of_match,
	500	.probe = mpc52xx_bcom_probe,
	501	.remove = mpc52xx_bcom_remove,
	502	.driver = {
	503	.name = DRIVER_NAME,
	504	.owner = THIS_MODULE,
	505	},
	506	};
	507
	508
	509	/* ======================================================================== */
	510	/* Module */
	511	/* ======================================================================== */
	512
	513	static int __init
	514	mpc52xx_bcom_init(void)
	515	{
	516	return of_register_platform_driver(&mpc52xx_bcom_of_platform_driver);
	517	}
	518
	519	static void __exit
	520	mpc52xx_bcom_exit(void)
	521	{
	522	of_unregister_platform_driver(&mpc52xx_bcom_of_platform_driver);
	523	}
	524
	525	/* If we're not a module, we must make sure everything is setup before */
	526	/* anyone tries to use us ... that's why we use subsys_initcall instead */
	527	/* of module_init. */
	528	subsys_initcall(mpc52xx_bcom_init);
	529	module_exit(mpc52xx_bcom_exit);
	530
	531	MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
	532	MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
	533	MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
	534	MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
	535	MODULE_LICENSE("GPL v2");
	536