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satip-axe/kernel/drivers/stm/stm-coprocessor.c

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/*
* Copyright (C) 2003-2004 Giuseppe Cavallaro (peppe.cavallaro@st.com)
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* Interfaces (where required) the co-processors on ST platforms based
* on multiprocessor architecture, for embedded products like Set-top-Box
* DVD, etc...
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/stm/coprocessor.h>
#include <linux/platform_device.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
static int __init proc_st_coproc_init(void);
#endif
/* ---------------------------------------------------------------------------
* Local (declared out of order) functions
* ------------------------------------------------------------------------ */
static int __init parse_coproc_mem(char *from);
/* ---------------------------------------------------------------------------
* Co-processor: Hardware dependent support
* This includes:
* - per platform device and memory addresses
* - platform dependent macros
* - HW dependent actions required by the generic APIs: Init,
* Open, Release, Ioctl (to reset, trigger the start (grant),
* peek and poke, etc...) functions
* ------------------------------------------------------------------------ */
extern struct coproc_board_info coproc_info;
/* ---------------------------------------------------------------------------
* Local data structure
* ------------------------------------------------------------------------ */
extern coproc_t coproc[]; /* The maximum number of copro- */
/* cessors depends on platform */
/* type */
#ifdef CONFIG_DEVFS_FS
static devfs_handle_t devfs_reset_hdl;
#endif
#if defined(CONFIG_COPROCESSOR_DEBUG) && defined(RPC_DEBUG)
/* -------------------------------------------------------------------------
* Co-processor DEBUG Suppor26t
*
* Currently we do not expect to receive asynchronous events from the
* slave processor. This routine as well as the IRQ definition has been
* foreseen and used for debug purposes.
* Once a slave is started the standard and supported way of communicating
* with the host processor is to rely on the RPC service.
*/
static int irq_count = 0;
static void mbx_irq_handle(int irq, void *cop, struct pt_regs *regs)
{
/* avoid a noisy loop if possible! */
irq_count++;
if ((irq_count % 100) == 0)
printk("st-coprocessor: unexpected interrupt %d from %s.%u\n",
irq, ((coproc_t *) cop)->pdev.name,((coproc_t *) cop)->pdev.id);
(void)&mbx_irq_handle; /* warning suppression */
}
#endif /* CONFIG_COPROCESSOR_DEBUG */
static void __debug(coproc_t * cop, const char *fnc)
{
/* Print the coprocessor control structure */
printk("%s.%u Coprocessor -------------------------------------------\n",
cop->pdev.name,cop->pdev.id);
if (cop->control == 0 || cop->ram_size == 0) {
printk(" not configured!\n");
goto skip_debug;
} else {
printk
(" flags %04x RAM start at 0x%08lx size 0x%08x\n",
cop->control, HOST_ADDR(cop, 0), cop->ram_size);
printk(" cop. addr 0x%08lx\n",
COPR_ADDR(cop, 0));
}
#ifdef CONFIG_COPROCESSOR_DEBUG
if (cop->h2c_port)
printk
(" Channels : h->c 0x%08x (%08lx) c->h 0x%08x (%08lx)\n",
cop->h2c_port, (long unsigned int)readl(cop->h2c_port), cop->c2h_port,
(long unsigned int)readl(cop->c2h_port));
else
#endif
printk(" Channels : Not defined\n");
if (cop->irq)
printk(" IRQ : %d\n", cop->irq);
else
printk(" IRQ : not used\n");
skip_debug:
printk
("---------------------------------------------------------------\n");
}
/* ---------------------------------------------------------------------------
* Co-processor driver APIs
* ------------------------------------------------------------------------ */
static int st_coproc_open(struct inode *inode, struct file *file)
{
/*
** use minor number (ID) to access the current coproc. descriptor
*/
coproc_t *cop = FILE_2_COP(coproc, file);
DPRINTK(">>> %s: %s-%u, cop->control = %d, cop->ram_size = %d\n",
__FUNCTION__, cop->pdev.name,cop->pdev.id, cop->control, cop->ram_size);
if (((cop - coproc) / sizeof(coproc_t)) >= coproc_info.max_coprs)
return (-ENODEV);
if (cop->ram_size == 0)
return (-ENOSPC);
if (cop->control & COPROC_IN_USE)
return (-EBUSY);
cop->control |= COPROC_IN_USE;
/* Now call the platform dependent open stage */
coproc_cpu_open(cop);
#ifdef CONFIG_COPROCESSOR_DEBUG
__debug(cop, __FUNCTION__);
#endif
return 0;
}
static int st_coproc_release(struct inode *inode, struct file *file)
{
coproc_t *cop = FILE_2_COP(coproc, file);
coproc_cpu_release(cop);
cop->control &= ~COPROC_IN_USE;
return 0;
}
static int st_coproc_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
coproc_t *cop = FILE_2_COP(coproc, file);
int res = 0;
switch (cmd) {
case STCOP_RESET:
res = coproc_cpu_reset(cop);
break;
case STCOP_GRANT:
/* Release the Slave CPU from reset (do not wait) */
res = coproc_cpu_grant(cop, arg);
break;
/* Peek and poke 32 bit cell: for debug only
* ------------------------------------------
* Not generally available, not documented and not supported.
* Simple and perhaps not reliable way for writing and reading a 32 bit
* value using the <stslave> application.
* PAY ATTENTION: the code doesn't make any validity check hence the use
* of a wrong address may have undesired effects!
*/
#define PAIRS(p) (p)[0] /* Number of couple: addr./value */
#define PORT(p) (p)[1] /* the address (port) */
#define VALUE(p) (p)[2] /* the 32 bit value */
case STCOP_PEEK:
{
u_long peek[3];
res = -EINVAL;
/* so far we need to peek only a single 32 bit cell */
res = copy_from_user(peek, (void __user *)arg,
sizeof(peek));
if (res < 0)
break;
if (PAIRS(peek) != 1)
break;
/* make the addr 32 bit aligned and peek the value */
PORT(peek) &= ~0x3;
VALUE(peek) = peek_l(PORT(peek));
DPRINTK(">>> %s: %s.%u; peek[%ld] @0x%08lx = 0x%08lx\n",
__FUNCTION__, cop->pdev.name,cop->pdev.id,
PAIRS(peek), PORT(peek), VALUE(peek));
/* don't mind wich data, make it availbale to the user */
res = copy_to_user((void *)arg, peek, sizeof(peek));
break;
}
case STCOP_POKE:
{
u_long poke[3];
res = -EINVAL;
/* so far we need to peek only a single 32 bit cell */
res = copy_from_user(poke, (void __user *)arg,
sizeof(poke));
if (res < 0)
break;
if (PAIRS(poke) != 1)
break;
/* make the addr 32 bit aligned and poke the value */
PORT(poke) &= ~0x3;
poke_l(VALUE(poke), PORT(poke));
DPRINTK(">>> %s: %s.%u; poke[%ld] @0x%08lx = 0x%08lx\n",
__FUNCTION__, cop->pdev.name,cop->pdev.id,
PAIRS(poke), PORT(poke), VALUE(poke));
res = 0;
break;
}
case STCOP_GET_PROPERTIES:
{
cop_properties_t clayout;
// strncpy(clayout.name, cop->pdev.name,
// sizeof(clayout.name));
sprintf(clayout.name,"%s-%u",cop->pdev.name,cop->pdev.id);
clayout.flags = cop->control;
clayout.ram_start = HOST_ADDR(cop, 0);
clayout.ram_size = cop->ram_size;
clayout.cp_ram_start = COPR_ADDR(cop, 0);
res =
copy_to_user((void *)arg, &clayout,
sizeof(cop_properties_t));
break;
}
case STCOP_SET_PROPERTIES:
{
/* Not yet supported! */
printk(KERN_INFO
"%s.%u: setting properties not yet available\n",
cop->pdev.name,cop->pdev.id);
res = -ENOSYS;
break;
}
default:
res = -EINVAL;
}
return (res);
}
static ssize_t st_coproc_read(struct file *file, char *buf,
size_t count, loff_t * ppos)
{
coproc_t *cop;
u_long from;
ssize_t bytes;
u_int offset = *ppos;
cop = FILE_2_COP(coproc, file);
/*
* File position assumes the Coprocessor RAM base addr.
* normalaized to 0
*/
if (offset >= cop->ram_size)
return (0);
from = (u_long) HOST_ADDR(cop, offset);
bytes = min(count, (cop->ram_size - offset));
DPRINTK(">>> %s: from 0x%08lx to 0x%08x len 0x%x(%d)\n",
__FUNCTION__, from, (u_int) buf, bytes, bytes);
if (copy_to_user(buf, (void *)from, bytes))
return (-EFAULT);
*ppos += bytes;
return (bytes);
}
static ssize_t st_coproc_write(struct file *file, const char *buf,
size_t count, loff_t * ppos)
{
coproc_t *cop;
u_long to;
ssize_t bytes;
u_int offset = (u_int) * ppos;
cop = FILE_2_COP(coproc, file);
/* File position assumes the RAM base addr. normalaized to 0 */
if (offset >= (u_long) cop->ram_size)
return (-EFBIG);
to = (u_long) HOST_ADDR(cop, offset);
bytes = min(count, (cop->ram_size - offset));
DPRINTK(">>> %s: from 0x%08x to 0x%08lx len 0x%x(%d)\n",
__FUNCTION__, (u_int) buf, to, bytes, bytes);
if (copy_from_user((void *)to, buf, bytes))
return (-EFAULT);
*ppos += bytes;
return (bytes);
}
static loff_t st_coproc_llseek(struct file *file, loff_t fpos, int orig)
{
coproc_t *cop;
u_long offset = fpos;
u_long base;
cop = FILE_2_COP(coproc, file);
/*
* fpos can be a real offset within the coprocessor region or a
* direct host address in the region (coming from application in
* case of mmap). This code assumes to be an address if it abs.
* value > COPR_ADDR, a normal offset otherwyse.
*/
base = HOST_ADDR(cop, 0);
DPRINTK
(">>> %s: seek to: 0x%08lx -> fpos = offset 0x%lx + base 0x%lx\n",
__FUNCTION__, (u_long) fpos, offset, HOST_ADDR(cop, 0));
switch (orig) {
case 0:
file->f_pos = offset;
break; /* SEEK_SET */
case 1:
file->f_pos += offset;
break; /* SEEK_CUR */
case 2:
file->f_pos = cop->ram_size + offset;
break; /* SEEK_END */
default:
return -EINVAL;
}
if (file->f_pos >= cop->ram_size)
file->f_pos = cop->ram_size - 1;
return (file->f_pos);
}
static int st_coproc_mmap(struct file *file, struct vm_area_struct *vma)
{
coproc_t *cop = FILE_2_COP(coproc, file);
unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned int vsize = vma->vm_end - vma->vm_start;
unsigned int psize = cop->ram_size - offset;
DPRINTK(">>> %s: vm_start=0x%lx, vm_end=0x%lx, vm_pgoff=0x%lx\n",
__FUNCTION__, vma->vm_start, vma->vm_end, vma->vm_pgoff);
if (vsize > psize)
return (-ENOSPC);
/*
* Call the remap_pfn_range(...) function to map in user space the
* coprocessor memory region. Uses ST40 no cache region
*/
vma->vm_flags |= VM_IO;
/* TODO: double check this. was a call
* to remap_page_range but without the >> PAGE_SHIFT
*/
if (remap_pfn_range(vma, vma->vm_start, cop->ram_offset
>> PAGE_SHIFT, vsize, vma->vm_page_prot)) {
DPRINTK(">>> %s: remap_page_range(...) failed\n", __FUNCTION__);
return (-EAGAIN);
}
DPRINTK(">>> %s: ... done: 0x%08lx len 0x%x --> 0x%08lx\n",
__FUNCTION__, (unsigned long)HOST_ADDR(cop, 0), vsize,
vma->vm_start);
return (0);
}
static struct file_operations coproc_fops = {
llseek:st_coproc_llseek,
read:st_coproc_read,
write:st_coproc_write,
ioctl:st_coproc_ioctl,
mmap:st_coproc_mmap,
open:st_coproc_open,
release:st_coproc_release
};
/* Start: ST-Coprocessor Device Attribute on SysFs*/
static ssize_t st_copro_show_running(struct device *dev,
struct device_attribute *attr, char *buf)
{
coproc_t *cop = container_of(dev, coproc_t, pdev.dev);
return sprintf(buf, "%d", cop->control & COPROC_IN_USE);
}
static DEVICE_ATTR(running, S_IRUGO, st_copro_show_running, NULL);
static ssize_t st_copro_show_mem_size(struct device *dev,
struct device_attribute *attr, char *buf)
{
coproc_t *cop = container_of(dev, coproc_t, pdev.dev);
return sprintf(buf, "0x%x", cop->ram_size);
}
static DEVICE_ATTR(mem_size, S_IRUGO, st_copro_show_mem_size, NULL);
static ssize_t st_copro_show_mem_base(struct device *dev,
struct device_attribute *attr, char *buf)
{
coproc_t *cop = container_of(dev, coproc_t, pdev.dev);
return sprintf(buf, "0x%x", (int)cop->ram_offset);
}
static DEVICE_ATTR(mem_base, S_IRUGO, st_copro_show_mem_base, NULL);
/* End: ST-Coprocessor Device Attribute SysFs*/
static int st_coproc_driver_probe(struct platform_device *dev)
{
if (!strncmp("st2", dev->name, 3))
return 1;
return 0;
}
#if defined(CONFIG_PM)
static int st_coproc_suspend(struct platform_device * dev, pm_message_t state)
{
printk("st_coproc_suspend: %s.%u down\n",dev->name,dev->id);
return 0;
}
static int st_coproc_resume(struct platform_device * dev)
{
printk("st_coproc_resume: %s.%u up\n",dev->name,dev->id);
return 0;
}
#endif
static struct platform_driver st_coproc_driver = {
.driver.name = "st-copro",
.driver.owner = THIS_MODULE,
.probe = st_coproc_driver_probe,
#if defined(CONFIG_PM)
.suspend =st_coproc_suspend,
.resume = st_coproc_resume,
#endif
};
static struct class *coproc_dev_class;
static int __init st_coproc_init(void)
{
int i;
coproc_t *cop;
struct platform_device *pdev;
printk("STMicroelectronics - Coprocessors %s Init\n", coproc_info.name);
if (platform_driver_register(&st_coproc_driver)){
printk(KERN_ERR
"Error on ST-Coprocessor device driver registration\n");
return (-EAGAIN);
}
if (register_chrdev(COPROCESSOR_MAJOR, coproc_info.name, &coproc_fops)) {
printk("Can't allocate major %d for ST Coprocessor Devices\n",
COPROCESSOR_MAJOR);
return (-EAGAIN);
}
coproc_dev_class = class_create(THIS_MODULE, "coproc-dev");
for (cop = &coproc[0], i = 0; i < coproc_info.max_coprs; i++, cop++) {
if (!cop->ram_offset) {
printk("st-coprocessor-%d: No RAM reserved\n", i);
cop->control &= ~COPROC_SPACE_ALLOCATE;
} else {
cop->control |= COPROC_SPACE_ALLOCATE;
cop->vma_address =
(int)ioremap_nocache((unsigned long)cop->ram_offset, cop->ram_size);
}
/*
** Nodes:
** STb7100 : /dev/st231-0 c 63 0
** : /dev/st231-1 c 63 1
** if the device file system support is configured the above
** devices are autonatically generated
*/
pdev = &(cop->pdev);
memset(pdev, 0, sizeof(struct platform_device));
pdev->name = coproc_info.name;
pdev->id = i;
pdev->dev.driver = &st_coproc_driver.driver;
/* Now complete with the platform dependent init stage */
if (coproc_cpu_init(cop)){
printk(KERN_ERR
"CPU %d : HW dep. initialization failed!\n", i);
continue;
}
if (platform_device_register(pdev)<0)
printk(KERN_ERR
"Error on ST-Coprocessor device registration\n");
else {
/* Add the attributes on the device */
if(device_create_file(&pdev->dev, &dev_attr_mem_base) |
device_create_file(&pdev->dev, &dev_attr_mem_size) |
device_create_file(&pdev->dev, &dev_attr_running))
printk(KERN_ERR "Error to add attribute to the coprocessor device\n");
/* Create the device file via Discovery System */
cop->dev = device_create(coproc_dev_class, NULL,
MKDEV(COPROCESSOR_MAJOR,pdev->id),
NULL,"st231-%d", pdev->id);
}
/* Now complete with the platform dependent init stage */
#if defined(CONFIG_COPROCESSOR_DEBUG) && defined(RPC_DEBUG)
{
/* just to debug on STi5528 application using the RPC 2.1,
* install a fake interrupt hadler
*/
int res;
cop->irq = EMBX_IRQ + i;
if ((res = request_irq(cop->irq, &mbx_irq_handle, 0,
coproc_info.name, cop)) != 0) {
printk
("st-coprocessor: Error %d booking IRQ %d for %s\n",
res, cop->irq, cop->name);
cop->irq = 0;
}
}
#endif
__debug(cop, __FUNCTION__);
}
#ifdef CONFIG_PROC_FS
proc_st_coproc_init();
#endif
return (0);
}
static void __exit st_coproc_exit(void)
{
DPRINTK("Release coprocessor module...\n");
}
/*
* Parse the optional kernel argument:
*
* ... coprocessor_mem=size_0@phis_address_0, size_1@phis_address_1
*
* It seems to be reasonable to assume that in a "staically partitioned
* RAM layout", the regions of RAM assigned to each slave processor are
* not scattered in memory!
*/
static int __init parse_coproc_mem(char *from)
{
char *cmdl = (from); /* start scan from '=' char */
u_long size, addr;
int i = 0;
char *error_msg;
static char size_error[] __initdata =
KERN_ERR "st-coprocessor: Error parsing size\n";
static char addr_error[] __initdata =
KERN_ERR "st-coprocessor: Error parsing address\n";
static char too_many_warn[] __initdata =
KERN_WARNING "st-coprocessor: More regions than coprocessors\n";
static char alloc_error[] __initdata =
KERN_ERR "st-coprocessor: Failed to reserve memory at 0x%08x\n";
while (*cmdl && (i < coproc_info.max_coprs)) {
size = memparse(cmdl, &cmdl);
if (*cmdl != '@') {
error_msg = size_error;
goto args_error;
}
addr = memparse(cmdl+1, &cmdl);
if (*cmdl) {
if (*cmdl++ != ',') {
error_msg = addr_error;
goto args_error;
}
}
coproc[i].ram_offset = addr;
coproc[i].ram_size = size;
++i;
}
if (*cmdl) {
printk(too_many_warn);
}
for (i = 0; i < coproc_info.max_coprs; ++i) {
if (coproc[i].ram_size) {
void* mem;
addr = coproc[i].ram_offset;
size = coproc[i].ram_size;
mem = __alloc_bootmem_nopanic(size, PAGE_SIZE, addr);
if (mem != __va(addr)) {
if (mem) {
free_bootmem(virt_to_phys(mem), size);
}
/* At this point, if addr overlaps kernel
* memory, coprocessor won't be allocated.
*/
if (coproc_check_area(addr, size, i, coproc))
printk(alloc_error, addr);
}
}
}
return 1;
args_error:
printk(error_msg);
return 1;
}
__setup("coprocessor_mem=", parse_coproc_mem);
MODULE_DESCRIPTION("Co-processor manager for multi-core devices");
MODULE_AUTHOR("STMicroelectronics Limited");
MODULE_VERSION("0.3");
MODULE_LICENSE("GPL");
module_init(st_coproc_init);
module_exit(st_coproc_exit);
#ifdef CONFIG_PROC_FS
static int show_st_coproc(struct seq_file *m, void *v)
{
int i;
coproc_t *cop;
seq_printf(m, "Coprocessors: %d %s\n",
coproc_info.max_coprs, coproc_info.name);
seq_printf(m,
" CPU (dev) Host addr. Copr. addr. Size\n");
seq_printf(m,
" -------------------------------------------------------------------\n");
for (i = 0, cop = &coproc[0]; i < coproc_info.max_coprs; i++, cop++) {
seq_printf(m, " /dev/%s-%u ", cop->pdev.name,cop->pdev.id);
if (cop->ram_size == 0)
seq_printf(m, "not allocated!\n");
else
seq_printf(m,
"0x%08lx 0x%08lx 0x%08x (%2d Mb)\n",
HOST_ADDR(cop, 0), COPR_ADDR(cop, 0),
cop->ram_size, (cop->ram_size / MEGA));
}
seq_printf(m, "\n");
coproc_proc_other_info(cop, m);
return (0);
}
static void *st_coproc_seq_start(struct seq_file *m, loff_t * pos)
{
return (void *)(*pos == 0);
}
static void *st_coproc_seq_next(struct seq_file *m, void *v, loff_t * pos)
{
return NULL;
}
static void st_coproc_seq_stop(struct seq_file *m, void *v)
{
}
static struct seq_operations proc_st_coproc_op = {
start:st_coproc_seq_start,
next:st_coproc_seq_next,
stop:st_coproc_seq_stop,
show:show_st_coproc,
};
static int proc_st_coproc_open(struct inode *inode, struct file *file)
{
return seq_open(file, &proc_st_coproc_op);
}
static struct file_operations proc_st_coproc_operations = {
open:proc_st_coproc_open,
read:seq_read,
llseek:seq_lseek,
release:seq_release,
};
static int __init proc_st_coproc_init(void)
{
struct proc_dir_entry *entry;
entry = create_proc_entry("coprocessor", 0, NULL);
if (entry != NULL) {
entry->proc_fops = &proc_st_coproc_operations;
}
return 0;
}
#endif /* CONFIG_PROC_FS */
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