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[POWERPC] bestcomm: core bestcomm support for Freescale MPC5200 

This patch adds support for the core of the BestComm API
for the Freescale MPC5200(b). The BestComm engine is a
microcode-controlled / tasks-based DMA used by several
of the onchip devices.

Setting up the tasks / memory allocation and all common
low level functions are handled by this patch.
The specifics details of each tasks and their microcode
are split-out in separate patches.

This is not the official API, but a much cleaner one.
(hopefully)

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
hifive-unleashed-5.1
Sylvain Munaut 2007-09-16 20:53:27 +10:00 committed by Grant Likely
parent 07e6e93136
commit 2f9ea1bde0
9 changed files with 1312 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/platforms/Kconfig
View File

@ -315,4 +315,6 @@ config FSL_ULI1575
config CPM
bool
source "arch/powerpc/sysdev/bestcomm/Kconfig"
endmenu

1
arch/powerpc/sysdev/Makefile
View File

@ -14,6 +14,7 @@ obj-$(CONFIG_FSL_SOC) += fsl_soc.o
obj-$(CONFIG_FSL_PCI) += fsl_pci.o
obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
mv64x60-$(CONFIG_PCI) += mv64x60_pci.o
obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o \
mv64x60_udbg.o

18
arch/powerpc/sysdev/bestcomm/Kconfig 100644
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@ -0,0 +1,18 @@
#
# Kconfig options for Bestcomm
#
config PPC_BESTCOMM
tristate "Bestcomm DMA engine support"
depends on PPC_MPC52xx
default n
select PPC_LIB_RHEAP
help
BestComm is the name of the communication coprocessor found
on the Freescale MPC5200 family of processor. It's usage is
optionnal for some drivers (like ATA), but required for
others (like FEC).
If you want to use drivers that require DMA operations,
answer Y or M. Otherwise say N.

8
arch/powerpc/sysdev/bestcomm/Makefile 100644
View File

@ -0,0 +1,8 @@
#
# Makefile for BestComm & co
#
bestcomm-core-objs := bestcomm.o sram.o
obj-$(CONFIG_PPC_BESTCOMM) += bestcomm-core.o

528
arch/powerpc/sysdev/bestcomm/bestcomm.c 100644
View File

@ -0,0 +1,528 @@
/*
* 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"
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;
/* 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, apparently it's not reliable yet */
/* FIXME: This should be done on 5200 and not 5200B ... */
out_be16(&bcom_eng->regs->PtdCntrl, in_be16(&bcom_eng->regs->PtdCntrl) | 1);
/* 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_compatible_node(NULL, "sram", "mpc5200-sram");
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",
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[] = {
{
.type = "dma-controller",
.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");

190
arch/powerpc/sysdev/bestcomm/bestcomm.h 100644
View File

@ -0,0 +1,190 @@
/*
* Public header for the MPC52xx processor BestComm driver
*
*
* Copyright (C) 2006 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.
*/
#ifndef __BESTCOMM_H__
#define __BESTCOMM_H__
struct bcom_bd; /* defined later on ... */
/* ======================================================================== */
/* Generic task managment */
/* ======================================================================== */
/**
* struct bcom_task - Structure describing a loaded BestComm task
*
* This structure is never built by the driver it self. It's built and
* filled the intermediate layer of the BestComm API, the task dependent
* support code.
*
* Most likely you don't need to poke around inside this structure. The
* fields are exposed in the header just for the sake of inline functions
*/
struct bcom_task {
unsigned int tasknum;
unsigned int flags;
int irq;
struct bcom_bd *bd;
phys_addr_t bd_pa;
void **cookie;
unsigned short index;
unsigned short outdex;
unsigned int num_bd;
unsigned int bd_size;
void* priv;
};
#define BCOM_FLAGS_NONE 0x00000000ul
#define BCOM_FLAGS_ENABLE_TASK (1ul << 0)
/**
* bcom_enable - Enable a BestComm task
* @tsk: The BestComm task structure
*
* This function makes sure the given task is enabled and can be run
* by the BestComm engine as needed
*/
extern void bcom_enable(struct bcom_task *tsk);
/**
* bcom_disable - Disable a BestComm task
* @tsk: The BestComm task structure
*
* This function disable a given task, making sure it's not executed
* by the BestComm engine.
*/
extern void bcom_disable(struct bcom_task *tsk);
/**
* bcom_get_task_irq - Returns the irq number of a BestComm task
* @tsk: The BestComm task structure
*/
static inline int
bcom_get_task_irq(struct bcom_task *tsk) {
return tsk->irq;
}
/* ======================================================================== */
/* BD based tasks helpers */
/* ======================================================================== */
/**
* struct bcom_bd - Structure describing a generic BestComm buffer descriptor
* @status: The current status of this buffer. Exact meaning depends on the
* task type
* @data: An array of u32 whose meaning depends on the task type.
*/
struct bcom_bd {
u32 status;
u32 data[1]; /* variable, but at least 1 */
};
#define BCOM_BD_READY 0x40000000ul
/** _bcom_next_index - Get next input index.
* @tsk: pointer to task structure
*
* Support function; Device drivers should not call this
*/
static inline int
_bcom_next_index(struct bcom_task *tsk)
{
return ((tsk->index + 1) == tsk->num_bd) ? 0 : tsk->index + 1;
}
/** _bcom_next_outdex - Get next output index.
* @tsk: pointer to task structure
*
* Support function; Device drivers should not call this
*/
static inline int
_bcom_next_outdex(struct bcom_task *tsk)
{
return ((tsk->outdex + 1) == tsk->num_bd) ? 0 : tsk->outdex + 1;
}
/**
* bcom_queue_empty - Checks if a BestComm task BD queue is empty
* @tsk: The BestComm task structure
*/
static inline int
bcom_queue_empty(struct bcom_task *tsk)
{
return tsk->index == tsk->outdex;
}
/**
* bcom_queue_full - Checks if a BestComm task BD queue is full
* @tsk: The BestComm task structure
*/
static inline int
bcom_queue_full(struct bcom_task *tsk)
{
return tsk->outdex == _bcom_next_index(tsk);
}
/**
* bcom_buffer_done - Checks if a BestComm
* @tsk: The BestComm task structure
*/
static inline int
bcom_buffer_done(struct bcom_task *tsk)
{
if (bcom_queue_empty(tsk))
return 0;
return !(tsk->bd[tsk->outdex].status & BCOM_BD_READY);
}
/**
* bcom_prepare_next_buffer - clear status of next available buffer.
* @tsk: The BestComm task structure
*
* Returns pointer to next buffer descriptor
*/
static inline struct bcom_bd *
bcom_prepare_next_buffer(struct bcom_task *tsk)
{
tsk->bd[tsk->index].status = 0; /* cleanup last status */
return &tsk->bd[tsk->index];
}
static inline void
bcom_submit_next_buffer(struct bcom_task *tsk, void *cookie)
{
tsk->cookie[tsk->index] = cookie;
mb(); /* ensure the bd is really up-to-date */
tsk->bd[tsk->index].status |= BCOM_BD_READY;
tsk->index = _bcom_next_index(tsk);
if (tsk->flags & BCOM_FLAGS_ENABLE_TASK)
bcom_enable(tsk);
}
static inline void *
bcom_retrieve_buffer(struct bcom_task *tsk, u32 *p_status, struct bcom_bd **p_bd)
{
void *cookie = tsk->cookie[tsk->outdex];
if (p_status)
*p_status = tsk->bd[tsk->outdex].status;
if (p_bd)
*p_bd = &tsk->bd[tsk->outdex];
tsk->outdex = _bcom_next_outdex(tsk);
return cookie;
}
#endif /* __BESTCOMM_H__ */

334
arch/powerpc/sysdev/bestcomm/bestcomm_priv.h 100644
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@ -0,0 +1,334 @@
/*
* Private header for the MPC52xx processor BestComm driver
*
* By private, we mean that driver should not use it directly. It's meant
* to be used by the BestComm engine driver itself and by the intermediate
* layer between the core and the drivers.
*
* Copyright (C) 2006 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.
*/
#ifndef __BESTCOMM_PRIV_H__
#define __BESTCOMM_PRIV_H__
#include <linux/spinlock.h>
#include <linux/of.h>
#include <asm/io.h>
#include <asm/mpc52xx.h>
#include "sram.h"
/* ======================================================================== */
/* Engine related stuff */
/* ======================================================================== */
/* Zones sizes and needed alignments */
#define BCOM_MAX_TASKS 16
#define BCOM_MAX_VAR 24
#define BCOM_MAX_INC 8
#define BCOM_MAX_FDT 64
#define BCOM_MAX_CTX 20
#define BCOM_CTX_SIZE (BCOM_MAX_CTX * sizeof(u32))
#define BCOM_CTX_ALIGN 0x100
#define BCOM_VAR_SIZE (BCOM_MAX_VAR * sizeof(u32))
#define BCOM_INC_SIZE (BCOM_MAX_INC * sizeof(u32))
#define BCOM_VAR_ALIGN 0x80
#define BCOM_FDT_SIZE (BCOM_MAX_FDT * sizeof(u32))
#define BCOM_FDT_ALIGN 0x100
/**
* struct bcom_tdt - Task Descriptor Table Entry
*
*/
struct bcom_tdt {
u32 start;
u32 stop;
u32 var;
u32 fdt;
u32 exec_status; /* used internally by BestComm engine */
u32 mvtp; /* used internally by BestComm engine */
u32 context;
u32 litbase;
};
/**
* struct bcom_engine
*
* This holds all info needed globaly to handle the engine
*/
struct bcom_engine {
struct device_node *ofnode;
struct mpc52xx_sdma __iomem *regs;
phys_addr_t regs_base;
struct bcom_tdt *tdt;
u32 *ctx;
u32 *var;
u32 *fdt;
spinlock_t lock;
};
extern struct bcom_engine *bcom_eng;
/* ======================================================================== */
/* Tasks related stuff */
/* ======================================================================== */
/* Tasks image header */
#define BCOM_TASK_MAGIC 0x4243544B /* 'BCTK' */
struct bcom_task_header {
u32 magic;
u8 desc_size; /* the size fields */
u8 var_size; /* are given in number */
u8 inc_size; /* of 32-bits words */
u8 first_var;
u8 reserved[8];
};
/* Descriptors stucture & co */
#define BCOM_DESC_NOP 0x000001f8
#define BCOM_LCD_MASK 0x80000000
#define BCOM_DRD_EXTENDED 0x40000000
#define BCOM_DRD_INITIATOR_SHIFT 21
/* Tasks pragma */
#define BCOM_PRAGMA_BIT_RSV 7 /* reserved pragma bit */
#define BCOM_PRAGMA_BIT_PRECISE_INC 6 /* increment 0=when possible, */
/* 1=iter end */
#define BCOM_PRAGMA_BIT_RST_ERROR_NO 5 /* don't reset errors on */
/* task enable */
#define BCOM_PRAGMA_BIT_PACK 4 /* pack data enable */
#define BCOM_PRAGMA_BIT_INTEGER 3 /* data alignment */
/* 0=frac(msb), 1=int(lsb) */
#define BCOM_PRAGMA_BIT_SPECREAD 2 /* XLB speculative read */
#define BCOM_PRAGMA_BIT_CW 1 /* write line buffer enable */
#define BCOM_PRAGMA_BIT_RL 0 /* read line buffer enable */
/* Looks like XLB speculative read generates XLB errors when a buffer
* is at the end of the physical memory. i.e. when accessing the
* lasts words, the engine tries to prefetch the next but there is no
* next ...
*/
#define BCOM_STD_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
(0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
(0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
(0 << BCOM_PRAGMA_BIT_PACK) | \
(0 << BCOM_PRAGMA_BIT_INTEGER) | \
(0 << BCOM_PRAGMA_BIT_SPECREAD) | \
(1 << BCOM_PRAGMA_BIT_CW) | \
(1 << BCOM_PRAGMA_BIT_RL))
#define BCOM_PCI_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
(0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
(0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
(0 << BCOM_PRAGMA_BIT_PACK) | \
(1 << BCOM_PRAGMA_BIT_INTEGER) | \
(0 << BCOM_PRAGMA_BIT_SPECREAD) | \
(1 << BCOM_PRAGMA_BIT_CW) | \
(1 << BCOM_PRAGMA_BIT_RL))
#define BCOM_ATA_PRAGMA BCOM_STD_PRAGMA
#define BCOM_CRC16_DP_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_CRC16_DP_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_FEC_RX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_FEC_TX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_2_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_3_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_BD_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_BD_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_RX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_TX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_LPC_PRAGMA BCOM_STD_PRAGMA
#define BCOM_PCI_RX_PRAGMA BCOM_PCI_PRAGMA
#define BCOM_PCI_TX_PRAGMA BCOM_PCI_PRAGMA
/* Initiators number */
#define BCOM_INITIATOR_ALWAYS 0
#define BCOM_INITIATOR_SCTMR_0 1
#define BCOM_INITIATOR_SCTMR_1 2
#define BCOM_INITIATOR_FEC_RX 3
#define BCOM_INITIATOR_FEC_TX 4
#define BCOM_INITIATOR_ATA_RX 5
#define BCOM_INITIATOR_ATA_TX 6
#define BCOM_INITIATOR_SCPCI_RX 7
#define BCOM_INITIATOR_SCPCI_TX 8
#define BCOM_INITIATOR_PSC3_RX 9
#define BCOM_INITIATOR_PSC3_TX 10
#define BCOM_INITIATOR_PSC2_RX 11
#define BCOM_INITIATOR_PSC2_TX 12
#define BCOM_INITIATOR_PSC1_RX 13
#define BCOM_INITIATOR_PSC1_TX 14
#define BCOM_INITIATOR_SCTMR_2 15
#define BCOM_INITIATOR_SCLPC 16
#define BCOM_INITIATOR_PSC5_RX 17
#define BCOM_INITIATOR_PSC5_TX 18
#define BCOM_INITIATOR_PSC4_RX 19
#define BCOM_INITIATOR_PSC4_TX 20
#define BCOM_INITIATOR_I2C2_RX 21
#define BCOM_INITIATOR_I2C2_TX 22
#define BCOM_INITIATOR_I2C1_RX 23
#define BCOM_INITIATOR_I2C1_TX 24
#define BCOM_INITIATOR_PSC6_RX 25
#define BCOM_INITIATOR_PSC6_TX 26
#define BCOM_INITIATOR_IRDA_RX 25
#define BCOM_INITIATOR_IRDA_TX 26
#define BCOM_INITIATOR_SCTMR_3 27
#define BCOM_INITIATOR_SCTMR_4 28
#define BCOM_INITIATOR_SCTMR_5 29
#define BCOM_INITIATOR_SCTMR_6 30
#define BCOM_INITIATOR_SCTMR_7 31
/* Initiators priorities */
#define BCOM_IPR_ALWAYS 7
#define BCOM_IPR_SCTMR_0 2
#define BCOM_IPR_SCTMR_1 2
#define BCOM_IPR_FEC_RX 6
#define BCOM_IPR_FEC_TX 5
#define BCOM_IPR_ATA_RX 4
#define BCOM_IPR_ATA_TX 3
#define BCOM_IPR_SCPCI_RX 2
#define BCOM_IPR_SCPCI_TX 2
#define BCOM_IPR_PSC3_RX 2
#define BCOM_IPR_PSC3_TX 2
#define BCOM_IPR_PSC2_RX 2
#define BCOM_IPR_PSC2_TX 2
#define BCOM_IPR_PSC1_RX 2
#define BCOM_IPR_PSC1_TX 2
#define BCOM_IPR_SCTMR_2 2
#define BCOM_IPR_SCLPC 2
#define BCOM_IPR_PSC5_RX 2
#define BCOM_IPR_PSC5_TX 2
#define BCOM_IPR_PSC4_RX 2
#define BCOM_IPR_PSC4_TX 2
#define BCOM_IPR_I2C2_RX 2
#define BCOM_IPR_I2C2_TX 2
#define BCOM_IPR_I2C1_RX 2
#define BCOM_IPR_I2C1_TX 2
#define BCOM_IPR_PSC6_RX 2
#define BCOM_IPR_PSC6_TX 2
#define BCOM_IPR_IRDA_RX 2
#define BCOM_IPR_IRDA_TX 2
#define BCOM_IPR_SCTMR_3 2
#define BCOM_IPR_SCTMR_4 2
#define BCOM_IPR_SCTMR_5 2
#define BCOM_IPR_SCTMR_6 2
#define BCOM_IPR_SCTMR_7 2
/* ======================================================================== */
/* API */
/* ======================================================================== */
extern struct bcom_task *bcom_task_alloc(int bd_count, int bd_size, int priv_size);
extern void bcom_task_free(struct bcom_task *tsk);
extern int bcom_load_image(int task, u32 *task_image);
extern void bcom_set_initiator(int task, int initiator);
#define TASK_ENABLE 0x8000
static inline void
bcom_enable_task(int task)
{
u16 reg;
reg = in_be16(&bcom_eng->regs->tcr[task]);
out_be16(&bcom_eng->regs->tcr[task], reg | TASK_ENABLE);
}
static inline void
bcom_disable_task(int task)
{
u16 reg = in_be16(&bcom_eng->regs->tcr[task]);
out_be16(&bcom_eng->regs->tcr[task], reg & ~TASK_ENABLE);
}
static inline u32 *
bcom_task_desc(int task)
{
return bcom_sram_pa2va(bcom_eng->tdt[task].start);
}
static inline int
bcom_task_num_descs(int task)
{
return (bcom_eng->tdt[task].stop - bcom_eng->tdt[task].start)/sizeof(u32) + 1;
}
static inline u32 *
bcom_task_var(int task)
{
return bcom_sram_pa2va(bcom_eng->tdt[task].var);
}
static inline u32 *
bcom_task_inc(int task)
{
return &bcom_task_var(task)[BCOM_MAX_VAR];
}
static inline int
bcom_drd_is_extended(u32 desc)
{
return (desc) & BCOM_DRD_EXTENDED;
}
static inline int
bcom_desc_is_drd(u32 desc)
{
return !(desc & BCOM_LCD_MASK) && desc != BCOM_DESC_NOP;
}
static inline int
bcom_desc_initiator(u32 desc)
{
return (desc >> BCOM_DRD_INITIATOR_SHIFT) & 0x1f;
}
static inline void
bcom_set_desc_initiator(u32 *desc, int initiator)
{
*desc = (*desc & ~(0x1f << BCOM_DRD_INITIATOR_SHIFT)) |
((initiator & 0x1f) << BCOM_DRD_INITIATOR_SHIFT);
}
static inline void
bcom_set_task_pragma(int task, int pragma)
{
u32 *fdt = &bcom_eng->tdt[task].fdt;
*fdt = (*fdt & ~0xff) | pragma;
}
static inline void
bcom_set_task_auto_start(int task, int next_task)
{
u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
out_be16(tcr, (in_be16(tcr) & ~0xff) | 0x00c0 | next_task);
}
static inline void
bcom_set_tcr_initiator(int task, int initiator)
{
u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
out_be16(tcr, (in_be16(tcr) & ~0x1f00) | ((initiator & 0x1f) << 8));
}
#endif /* __BESTCOMM_PRIV_H__ */

177
arch/powerpc/sysdev/bestcomm/sram.c 100644
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@ -0,0 +1,177 @@
/*
* Simple memory allocator for on-board SRAM
*
*
* Maintainer : Sylvain Munaut <tnt@246tNt.com>
*
* Copyright (C) 2005 Sylvain Munaut <tnt@246tNt.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/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <asm/io.h>
#include <asm/mmu.h>
#include "sram.h"
/* Struct keeping our 'state' */
struct bcom_sram *bcom_sram = NULL;
EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */
/* ======================================================================== */
/* Public API */
/* ======================================================================== */
/* DO NOT USE in interrupts, if needed in irq handler, we should use the
_irqsave version of the spin_locks */
int bcom_sram_init(struct device_node *sram_node, char *owner)
{
int rv;
const u32 *regaddr_p;
u64 regaddr64, size64;
unsigned int psize;
/* Create our state struct */
if (bcom_sram) {
printk(KERN_ERR "%s: bcom_sram_init: "
"Already initialized !\n", owner);
return -EBUSY;
}
bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL);
if (!bcom_sram) {
printk(KERN_ERR "%s: bcom_sram_init: "
"Couldn't allocate internal state !\n", owner);
return -ENOMEM;
}
/* Get address and size of the sram */
regaddr_p = of_get_address(sram_node, 0, &size64, NULL);
if (!regaddr_p) {
printk(KERN_ERR "%s: bcom_sram_init: "
"Invalid device node !\n", owner);
rv = -EINVAL;
goto error_free;
}
regaddr64 = of_translate_address(sram_node, regaddr_p);
bcom_sram->base_phys = (phys_addr_t) regaddr64;
bcom_sram->size = (unsigned int) size64;
/* Request region */
if (!request_mem_region(bcom_sram->base_phys, bcom_sram->size, owner)) {
printk(KERN_ERR "%s: bcom_sram_init: "
"Couldn't request region !\n", owner);
rv = -EBUSY;
goto error_free;
}
/* Map SRAM */
/* sram is not really __iomem */
bcom_sram->base_virt = (void*) ioremap(bcom_sram->base_phys, bcom_sram->size);
if (!bcom_sram->base_virt) {
printk(KERN_ERR "%s: bcom_sram_init: "
"Map error SRAM zone 0x%08lx (0x%0x)!\n",
owner, bcom_sram->base_phys, bcom_sram->size );
rv = -ENOMEM;
goto error_release;
}
/* Create an rheap (defaults to 32 bits word alignment) */
bcom_sram->rh = rh_create(4);
/* Attach the free zones */
#if 0
/* Currently disabled ... for future use only */
reg_addr_p = of_get_property(sram_node, "available", &psize);
#else
regaddr_p = NULL;
psize = 0;
#endif
if (!regaddr_p || !psize) {
/* Attach the whole zone */
rh_attach_region(bcom_sram->rh, 0, bcom_sram->size);
} else {
/* Attach each zone independently */
while (psize >= 2 * sizeof(u32)) {
phys_addr_t zbase = of_translate_address(sram_node, regaddr_p);
rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]);
regaddr_p += 2;
psize -= 2 * sizeof(u32);
}
}
/* Init our spinlock */
spin_lock_init(&bcom_sram->lock);
return 0;
error_release:
release_mem_region(bcom_sram->base_phys, bcom_sram->size);
error_free:
kfree(bcom_sram);
bcom_sram = NULL;
return rv;
}
EXPORT_SYMBOL_GPL(bcom_sram_init);
void bcom_sram_cleanup(void)
{
/* Free resources */
if (bcom_sram) {
rh_destroy(bcom_sram->rh);
iounmap((void __iomem *)bcom_sram->base_virt);
release_mem_region(bcom_sram->base_phys, bcom_sram->size);
kfree(bcom_sram);
bcom_sram = NULL;
}
}
EXPORT_SYMBOL_GPL(bcom_sram_cleanup);
void* bcom_sram_alloc(int size, int align, phys_addr_t *phys)
{
unsigned long offset;
spin_lock(&bcom_sram->lock);
offset = rh_alloc_align(bcom_sram->rh, size, align, NULL);
spin_unlock(&bcom_sram->lock);
if (IS_ERR_VALUE(offset))
return NULL;
*phys = bcom_sram->base_phys + offset;
return bcom_sram->base_virt + offset;
}
EXPORT_SYMBOL_GPL(bcom_sram_alloc);
void bcom_sram_free(void *ptr)
{
unsigned long offset;
if (!ptr)
return;
offset = ptr - bcom_sram->base_virt;
spin_lock(&bcom_sram->lock);
rh_free(bcom_sram->rh, offset);
spin_unlock(&bcom_sram->lock);
}
EXPORT_SYMBOL_GPL(bcom_sram_free);

54
arch/powerpc/sysdev/bestcomm/sram.h 100644
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@ -0,0 +1,54 @@
/*
* Handling of a sram zone for bestcomm
*
*
* Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.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.
*/
#ifndef __BESTCOMM_SRAM_H__
#define __BESTCOMM_SRAM_H__
#include <asm/rheap.h>
#include <asm/mmu.h>
#include <linux/spinlock.h>
/* Structure used internally */
/* The internals are here for the inline functions
* sake, certainly not for the user to mess with !
*/
struct bcom_sram {
phys_addr_t base_phys;
void *base_virt;
unsigned int size;
rh_info_t *rh;
spinlock_t lock;
};
extern struct bcom_sram *bcom_sram;
/* Public API */
extern int bcom_sram_init(struct device_node *sram_node, char *owner);
extern void bcom_sram_cleanup(void);
extern void* bcom_sram_alloc(int size, int align, phys_addr_t *phys);
extern void bcom_sram_free(void *ptr);
static inline phys_addr_t bcom_sram_va2pa(void *va) {
return bcom_sram->base_phys +
(unsigned long)(va - bcom_sram->base_virt);
}
static inline void *bcom_sram_pa2va(phys_addr_t pa) {
return bcom_sram->base_virt +
(unsigned long)(pa - bcom_sram->base_phys);
}
#endif /* __BESTCOMM_SRAM_H__ */