leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
dc44abd6aa
linux/arch/mips/jazz/jazzdma.c
Paul Gortmaker 26dd3e4ff9 MIPS: Audit and remove any unnecessary uses of module.h 
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  In the case of
some code where it is modular, we can extend that to also include
files that are building basic support functionality but not related
to loading or registering the final module; such files also have
no need whatsoever for module.h

The advantage in removing such instances is that module.h itself
sources about 15 other headers; adding significantly to what we feed
cpp, and it can obscure what headers we are effectively using.

Since module.h might have been the implicit source for init.h
(for __init) and for export.h (for EXPORT_SYMBOL) we consider each
instance for the presence of either and replace/add as needed.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

Build coverage of all the mips defconfigs revealed the module.h
header was masking a couple of implicit include instances, so
we add the appropriate headers there.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: David Daney <david.daney@cavium.com>
Cc: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "Steven J. Hill" <steven.hill@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15131/
[james.hogan@imgtec.com: Preserve sort order where it already exists]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
2017-02-14 09:00:25 +00:00

559 lines
13 KiB
C
Raw Blame History

/*
* Mips Jazz DMA controller support
* Copyright (C) 1995, 1996 by Andreas Busse
*
* NOTE: Some of the argument checking could be removed when
* things have settled down. Also, instead of returning 0xffffffff
* on failure of vdma_alloc() one could leave page #0 unused
* and return the more usual NULL pointer as logical address.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/gfp.h>
#include <asm/mipsregs.h>
#include <asm/jazz.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/dma.h>
#include <asm/jazzdma.h>
#include <asm/pgtable.h>
/*
* Set this to one to enable additional vdma debug code.
*/
#define CONF_DEBUG_VDMA 0
static VDMA_PGTBL_ENTRY *pgtbl;
static DEFINE_SPINLOCK(vdma_lock);
/*
* Debug stuff
*/
#define vdma_debug ((CONF_DEBUG_VDMA) ? debuglvl : 0)
static int debuglvl = 3;
/*
* Initialize the pagetable with a one-to-one mapping of
* the first 16 Mbytes of main memory and declare all
* entries to be unused. Using this method will at least
* allow some early device driver operations to work.
*/
static inline void vdma_pgtbl_init(void)
{
unsigned long paddr = 0;
int i;
for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
pgtbl[i].frame = paddr;
pgtbl[i].owner = VDMA_PAGE_EMPTY;
paddr += VDMA_PAGESIZE;
}
}
/*
* Initialize the Jazz R4030 dma controller
*/
static int __init vdma_init(void)
{
/*
* Allocate 32k of memory for DMA page tables. This needs to be page
* aligned and should be uncached to avoid cache flushing after every
* update.
*/
pgtbl = (VDMA_PGTBL_ENTRY *)__get_free_pages(GFP_KERNEL | GFP_DMA,
get_order(VDMA_PGTBL_SIZE));
BUG_ON(!pgtbl);
dma_cache_wback_inv((unsigned long)pgtbl, VDMA_PGTBL_SIZE);
pgtbl = (VDMA_PGTBL_ENTRY *)KSEG1ADDR(pgtbl);
/*
* Clear the R4030 translation table
*/
vdma_pgtbl_init();
r4030_write_reg32(JAZZ_R4030_TRSTBL_BASE, CPHYSADDR(pgtbl));
r4030_write_reg32(JAZZ_R4030_TRSTBL_LIM, VDMA_PGTBL_SIZE);
r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
printk(KERN_INFO "VDMA: R4030 DMA pagetables initialized.\n");
return 0;
}
/*
* Allocate DMA pagetables using a simple first-fit algorithm
*/
unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
{
int first, last, pages, frame, i;
unsigned long laddr, flags;
/* check arguments */
if (paddr > 0x1fffffff) {
if (vdma_debug)
printk("vdma_alloc: Invalid physical address: %08lx\n",
paddr);
return VDMA_ERROR; /* invalid physical address */
}
if (size > 0x400000 || size == 0) {
if (vdma_debug)
printk("vdma_alloc: Invalid size: %08lx\n", size);
return VDMA_ERROR; /* invalid physical address */
}
spin_lock_irqsave(&vdma_lock, flags);
/*
* Find free chunk
*/
pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1;
first = 0;
while (1) {
while (pgtbl[first].owner != VDMA_PAGE_EMPTY &&
first < VDMA_PGTBL_ENTRIES) first++;
if (first + pages > VDMA_PGTBL_ENTRIES) { /* nothing free */
spin_unlock_irqrestore(&vdma_lock, flags);
return VDMA_ERROR;
}
last = first + 1;
while (pgtbl[last].owner == VDMA_PAGE_EMPTY
&& last - first < pages)
last++;
if (last - first == pages)
break; /* found */
first = last + 1;
}
/*
* Mark pages as allocated
*/
laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
frame = paddr & ~(VDMA_PAGESIZE - 1);
for (i = first; i < last; i++) {
pgtbl[i].frame = frame;
pgtbl[i].owner = laddr;
frame += VDMA_PAGESIZE;
}
/*
* Update translation table and return logical start address
*/
r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
if (vdma_debug > 1)
printk("vdma_alloc: Allocated %d pages starting from %08lx\n",
pages, laddr);
if (vdma_debug > 2) {
printk("LADDR: ");
for (i = first; i < last; i++)
printk("%08x ", i << 12);
printk("\nPADDR: ");
for (i = first; i < last; i++)
printk("%08x ", pgtbl[i].frame);
printk("\nOWNER: ");
for (i = first; i < last; i++)
printk("%08x ", pgtbl[i].owner);
printk("\n");
}
spin_unlock_irqrestore(&vdma_lock, flags);
return laddr;
}
EXPORT_SYMBOL(vdma_alloc);
/*
* Free previously allocated dma translation pages
* Note that this does NOT change the translation table,
* it just marks the free'd pages as unused!
*/
int vdma_free(unsigned long laddr)
{
int i;
i = laddr >> 12;
if (pgtbl[i].owner != laddr) {
printk
("vdma_free: trying to free other's dma pages, laddr=%8lx\n",
laddr);
return -1;
}
while (i < VDMA_PGTBL_ENTRIES && pgtbl[i].owner == laddr) {
pgtbl[i].owner = VDMA_PAGE_EMPTY;
i++;
}
if (vdma_debug > 1)
printk("vdma_free: freed %ld pages starting from %08lx\n",
i - (laddr >> 12), laddr);
return 0;
}
EXPORT_SYMBOL(vdma_free);
/*
* Map certain page(s) to another physical address.
* Caller must have allocated the page(s) before.
*/
int vdma_remap(unsigned long laddr, unsigned long paddr, unsigned long size)
{
int first, pages;
if (laddr > 0xffffff) {
if (vdma_debug)
printk
("vdma_map: Invalid logical address: %08lx\n",
laddr);
return -EINVAL; /* invalid logical address */
}
if (paddr > 0x1fffffff) {
if (vdma_debug)
printk
("vdma_map: Invalid physical address: %08lx\n",
paddr);
return -EINVAL; /* invalid physical address */
}
pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
first = laddr >> 12;
if (vdma_debug)
printk("vdma_remap: first=%x, pages=%x\n", first, pages);
if (first + pages > VDMA_PGTBL_ENTRIES) {
if (vdma_debug)
printk("vdma_alloc: Invalid size: %08lx\n", size);
return -EINVAL;
}
paddr &= ~(VDMA_PAGESIZE - 1);
while (pages > 0 && first < VDMA_PGTBL_ENTRIES) {
if (pgtbl[first].owner != laddr) {
if (vdma_debug)
printk("Trying to remap other's pages.\n");
return -EPERM; /* not owner */
}
pgtbl[first].frame = paddr;
paddr += VDMA_PAGESIZE;
first++;
pages--;
}
/*
* Update translation table
*/
r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
if (vdma_debug > 2) {
int i;
pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
first = laddr >> 12;
printk("LADDR: ");
for (i = first; i < first + pages; i++)
printk("%08x ", i << 12);
printk("\nPADDR: ");
for (i = first; i < first + pages; i++)
printk("%08x ", pgtbl[i].frame);
printk("\nOWNER: ");
for (i = first; i < first + pages; i++)
printk("%08x ", pgtbl[i].owner);
printk("\n");
}
return 0;
}
/*
* Translate a physical address to a logical address.
* This will return the logical address of the first
* match.
*/
unsigned long vdma_phys2log(unsigned long paddr)
{
int i;
int frame;
frame = paddr & ~(VDMA_PAGESIZE - 1);
for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
if (pgtbl[i].frame == frame)
break;
}
if (i == VDMA_PGTBL_ENTRIES)
return ~0UL;
return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
}
EXPORT_SYMBOL(vdma_phys2log);
/*
* Translate a logical DMA address to a physical address
*/
unsigned long vdma_log2phys(unsigned long laddr)
{
return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
}
EXPORT_SYMBOL(vdma_log2phys);
/*
* Print DMA statistics
*/
void vdma_stats(void)
{
int i;
printk("vdma_stats: CONFIG: %08x\n",
r4030_read_reg32(JAZZ_R4030_CONFIG));
printk("R4030 translation table base: %08x\n",
r4030_read_reg32(JAZZ_R4030_TRSTBL_BASE));
printk("R4030 translation table limit: %08x\n",
r4030_read_reg32(JAZZ_R4030_TRSTBL_LIM));
printk("vdma_stats: INV_ADDR: %08x\n",
r4030_read_reg32(JAZZ_R4030_INV_ADDR));
printk("vdma_stats: R_FAIL_ADDR: %08x\n",
r4030_read_reg32(JAZZ_R4030_R_FAIL_ADDR));
printk("vdma_stats: M_FAIL_ADDR: %08x\n",
r4030_read_reg32(JAZZ_R4030_M_FAIL_ADDR));
printk("vdma_stats: IRQ_SOURCE: %08x\n",
r4030_read_reg32(JAZZ_R4030_IRQ_SOURCE));
printk("vdma_stats: I386_ERROR: %08x\n",
r4030_read_reg32(JAZZ_R4030_I386_ERROR));
printk("vdma_chnl_modes: ");
for (i = 0; i < 8; i++)
printk("%04x ",
(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
(i << 5)));
printk("\n");
printk("vdma_chnl_enables: ");
for (i = 0; i < 8; i++)
printk("%04x ",
(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(i << 5)));
printk("\n");
}
/*
* DMA transfer functions
*/
/*
* Enable a DMA channel. Also clear any error conditions.
*/
void vdma_enable(int channel)
{
int status;
if (vdma_debug)
printk("vdma_enable: channel %d\n", channel);
/*
* Check error conditions first
*/
status = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
if (status & 0x400)
printk("VDMA: Channel %d: Address error!\n", channel);
if (status & 0x200)
printk("VDMA: Channel %d: Memory error!\n", channel);
/*
* Clear all interrupt flags
*/
r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5)) | R4030_TC_INTR
| R4030_MEM_INTR | R4030_ADDR_INTR);
/*
* Enable the desired channel
*/
r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5)) |
R4030_CHNL_ENABLE);
}
EXPORT_SYMBOL(vdma_enable);
/*
* Disable a DMA channel
*/
void vdma_disable(int channel)
{
if (vdma_debug) {
int status =
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5));
printk("vdma_disable: channel %d\n", channel);
printk("VDMA: channel %d status: %04x (%s) mode: "
"%02x addr: %06x count: %06x\n",
channel, status,
((status & 0x600) ? "ERROR" : "OK"),
(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
(channel << 5)),
(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ADDR +
(channel << 5)),
(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_COUNT +
(channel << 5)));
}
r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5)) &
~R4030_CHNL_ENABLE);
/*
* After disabling a DMA channel a remote bus register should be
* read to ensure that the current DMA acknowledge cycle is completed.
*/
*((volatile unsigned int *) JAZZ_DUMMY_DEVICE);
}
EXPORT_SYMBOL(vdma_disable);
/*
* Set DMA mode. This function accepts the mode values used
* to set a PC-style DMA controller. For the SCSI and FDC
* channels, we also set the default modes each time we're
* called.
* NOTE: The FAST and BURST dma modes are supported by the
* R4030 Rev. 2 and PICA chipsets only. I leave them disabled
* for now.
*/
void vdma_set_mode(int channel, int mode)
{
if (vdma_debug)
printk("vdma_set_mode: channel %d, mode 0x%x\n", channel,
mode);
switch (channel) {
case JAZZ_SCSI_DMA: /* scsi */
r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
/* R4030_MODE_FAST | */
/* R4030_MODE_BURST | */
R4030_MODE_INTR_EN |
R4030_MODE_WIDTH_16 |
R4030_MODE_ATIME_80);
break;
case JAZZ_FLOPPY_DMA: /* floppy */
r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
/* R4030_MODE_FAST | */
/* R4030_MODE_BURST | */
R4030_MODE_INTR_EN |
R4030_MODE_WIDTH_8 |
R4030_MODE_ATIME_120);
break;
case JAZZ_AUDIOL_DMA:
case JAZZ_AUDIOR_DMA:
printk("VDMA: Audio DMA not supported yet.\n");
break;
default:
printk
("VDMA: vdma_set_mode() called with unsupported channel %d!\n",
channel);
}
switch (mode) {
case DMA_MODE_READ:
r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5)) &
~R4030_CHNL_WRITE);
break;
case DMA_MODE_WRITE:
r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
(channel << 5)) |
R4030_CHNL_WRITE);
break;
default:
printk
("VDMA: vdma_set_mode() called with unknown dma mode 0x%x\n",
mode);
}
}
EXPORT_SYMBOL(vdma_set_mode);
/*
* Set Transfer Address
*/
void vdma_set_addr(int channel, long addr)
{
if (vdma_debug)
printk("vdma_set_addr: channel %d, addr %lx\n", channel,
addr);
r4030_write_reg32(JAZZ_R4030_CHNL_ADDR + (channel << 5), addr);
}
EXPORT_SYMBOL(vdma_set_addr);
/*
* Set Transfer Count
*/
void vdma_set_count(int channel, int count)
{
if (vdma_debug)
printk("vdma_set_count: channel %d, count %08x\n", channel,
(unsigned) count);
r4030_write_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5), count);
}
EXPORT_SYMBOL(vdma_set_count);
/*
* Get Residual
*/
int vdma_get_residue(int channel)
{
int residual;
residual = r4030_read_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5));
if (vdma_debug)
printk("vdma_get_residual: channel %d: residual=%d\n",
channel, residual);
return residual;
}
/*
* Get DMA channel enable register
*/
int vdma_get_enable(int channel)
{
int enable;
enable = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
if (vdma_debug)
printk("vdma_get_enable: channel %d: enable=%d\n", channel,
enable);
return enable;
}
arch_initcall(vdma_init);
Reference in New Issue View Git Blame Copy Permalink