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linux/arch/sh64/kernel/dma.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

297 lines
7.2 KiB
C
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/*
* arch/sh64/kernel/dma.c
*
* DMA routines for the SH-5 DMAC.
*
* Copyright (C) 2003 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <asm/hardware.h>
#include <asm/dma.h>
#include <asm/signal.h>
#include <asm/errno.h>
#include <asm/io.h>
typedef struct {
unsigned long dev_addr;
unsigned long mem_addr;
unsigned int mode;
unsigned int count;
} dma_info_t;
static dma_info_t dma_info[MAX_DMA_CHANNELS];
static DEFINE_SPINLOCK(dma_spin_lock);
/* arch/sh64/kernel/irq_intc.c */
extern void make_intc_irq(unsigned int irq);
/* DMAC Interrupts */
#define DMA_IRQ_DMTE0 18
#define DMA_IRQ_DERR 22
#define DMAC_COMMON_BASE (dmac_base + 0x08)
#define DMAC_SAR_BASE (dmac_base + 0x10)
#define DMAC_DAR_BASE (dmac_base + 0x18)
#define DMAC_COUNT_BASE (dmac_base + 0x20)
#define DMAC_CTRL_BASE (dmac_base + 0x28)
#define DMAC_STATUS_BASE (dmac_base + 0x30)
#define DMAC_SAR(n) (DMAC_SAR_BASE + ((n) * 0x28))
#define DMAC_DAR(n) (DMAC_DAR_BASE + ((n) * 0x28))
#define DMAC_COUNT(n) (DMAC_COUNT_BASE + ((n) * 0x28))
#define DMAC_CTRL(n) (DMAC_CTRL_BASE + ((n) * 0x28))
#define DMAC_STATUS(n) (DMAC_STATUS_BASE + ((n) * 0x28))
/* DMAC.COMMON Bit Definitions */
#define DMAC_COMMON_PR 0x00000001 /* Priority */
/* Bits 1-2 Reserved */
#define DMAC_COMMON_ME 0x00000008 /* Master Enable */
#define DMAC_COMMON_NMI 0x00000010 /* NMI Flag */
/* Bits 5-6 Reserved */
#define DMAC_COMMON_ER 0x00000780 /* Error Response */
#define DMAC_COMMON_AAE 0x00007800 /* Address Alignment Error */
/* Bits 15-63 Reserved */
/* DMAC.SAR Bit Definitions */
#define DMAC_SAR_ADDR 0xffffffff /* Source Address */
/* DMAC.DAR Bit Definitions */
#define DMAC_DAR_ADDR 0xffffffff /* Destination Address */
/* DMAC.COUNT Bit Definitions */
#define DMAC_COUNT_CNT 0xffffffff /* Transfer Count */
/* DMAC.CTRL Bit Definitions */
#define DMAC_CTRL_TS 0x00000007 /* Transfer Size */
#define DMAC_CTRL_SI 0x00000018 /* Source Increment */
#define DMAC_CTRL_DI 0x00000060 /* Destination Increment */
#define DMAC_CTRL_RS 0x00000780 /* Resource Select */
#define DMAC_CTRL_IE 0x00000800 /* Interrupt Enable */
#define DMAC_CTRL_TE 0x00001000 /* Transfer Enable */
/* Bits 15-63 Reserved */
/* DMAC.STATUS Bit Definitions */
#define DMAC_STATUS_TE 0x00000001 /* Transfer End */
#define DMAC_STATUS_AAE 0x00000002 /* Address Alignment Error */
/* Bits 2-63 Reserved */
static unsigned long dmac_base;
void set_dma_count(unsigned int chan, unsigned int count);
void set_dma_addr(unsigned int chan, unsigned int addr);
static irqreturn_t dma_mte(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned int chan = irq - DMA_IRQ_DMTE0;
dma_info_t *info = dma_info + chan;
u64 status;
if (info->mode & DMA_MODE_WRITE) {
sh64_out64(info->mem_addr & DMAC_SAR_ADDR, DMAC_SAR(chan));
} else {
sh64_out64(info->mem_addr & DMAC_DAR_ADDR, DMAC_DAR(chan));
}
set_dma_count(chan, info->count);
/* Clear the TE bit */
status = sh64_in64(DMAC_STATUS(chan));
status &= ~DMAC_STATUS_TE;
sh64_out64(status, DMAC_STATUS(chan));
return IRQ_HANDLED;
}
static struct irqaction irq_dmte = {
.handler = dma_mte,
.flags = SA_INTERRUPT,
.name = "DMA MTE",
};
static irqreturn_t dma_err(int irq, void *dev_id, struct pt_regs *regs)
{
u64 tmp;
u8 chan;
printk(KERN_NOTICE "DMAC: Got a DMA Error!\n");
tmp = sh64_in64(DMAC_COMMON_BASE);
/* Check for the type of error */
if ((chan = tmp & DMAC_COMMON_AAE)) {
/* It's an address alignment error.. */
printk(KERN_NOTICE "DMAC: Alignment error on channel %d, ", chan);
printk(KERN_NOTICE "SAR: 0x%08llx, DAR: 0x%08llx, COUNT: %lld\n",
(sh64_in64(DMAC_SAR(chan)) & DMAC_SAR_ADDR),
(sh64_in64(DMAC_DAR(chan)) & DMAC_DAR_ADDR),
(sh64_in64(DMAC_COUNT(chan)) & DMAC_COUNT_CNT));
} else if ((chan = tmp & DMAC_COMMON_ER)) {
/* Something else went wrong.. */
printk(KERN_NOTICE "DMAC: Error on channel %d\n", chan);
}
/* Reset the ME bit to clear the interrupt */
tmp |= DMAC_COMMON_ME;
sh64_out64(tmp, DMAC_COMMON_BASE);
return IRQ_HANDLED;
}
static struct irqaction irq_derr = {
.handler = dma_err,
.flags = SA_INTERRUPT,
.name = "DMA Error",
};
static inline unsigned long calc_xmit_shift(unsigned int chan)
{
return sh64_in64(DMAC_CTRL(chan)) & 0x03;
}
void setup_dma(unsigned int chan, dma_info_t *info)
{
unsigned int irq = DMA_IRQ_DMTE0 + chan;
dma_info_t *dma = dma_info + chan;
make_intc_irq(irq);
setup_irq(irq, &irq_dmte);
dma = info;
}
void enable_dma(unsigned int chan)
{
u64 ctrl;
ctrl = sh64_in64(DMAC_CTRL(chan));
ctrl |= DMAC_CTRL_TE;
sh64_out64(ctrl, DMAC_CTRL(chan));
}
void disable_dma(unsigned int chan)
{
u64 ctrl;
ctrl = sh64_in64(DMAC_CTRL(chan));
ctrl &= ~DMAC_CTRL_TE;
sh64_out64(ctrl, DMAC_CTRL(chan));
}
void set_dma_mode(unsigned int chan, char mode)
{
dma_info_t *info = dma_info + chan;
info->mode = mode;
set_dma_addr(chan, info->mem_addr);
set_dma_count(chan, info->count);
}
void set_dma_addr(unsigned int chan, unsigned int addr)
{
dma_info_t *info = dma_info + chan;
unsigned long sar, dar;
info->mem_addr = addr;
sar = (info->mode & DMA_MODE_WRITE) ? info->mem_addr : info->dev_addr;
dar = (info->mode & DMA_MODE_WRITE) ? info->dev_addr : info->mem_addr;
sh64_out64(sar & DMAC_SAR_ADDR, DMAC_SAR(chan));
sh64_out64(dar & DMAC_SAR_ADDR, DMAC_DAR(chan));
}
void set_dma_count(unsigned int chan, unsigned int count)
{
dma_info_t *info = dma_info + chan;
u64 tmp;
info->count = count;
tmp = (info->count >> calc_xmit_shift(chan)) & DMAC_COUNT_CNT;
sh64_out64(tmp, DMAC_COUNT(chan));
}
unsigned long claim_dma_lock(void)
{
unsigned long flags;
spin_lock_irqsave(&dma_spin_lock, flags);
return flags;
}
void release_dma_lock(unsigned long flags)
{
spin_unlock_irqrestore(&dma_spin_lock, flags);
}
int get_dma_residue(unsigned int chan)
{
return sh64_in64(DMAC_COUNT(chan) << calc_xmit_shift(chan));
}
int __init init_dma(void)
{
struct vcr_info vcr;
u64 tmp;
/* Remap the DMAC */
dmac_base = onchip_remap(PHYS_DMAC_BLOCK, 1024, "DMAC");
if (!dmac_base) {
printk(KERN_ERR "Unable to remap DMAC\n");
return -ENOMEM;
}
/* Report DMAC.VCR Info */
vcr = sh64_get_vcr_info(dmac_base);
printk("DMAC: Module ID: 0x%04x, Module version: 0x%04x\n",
vcr.mod_id, vcr.mod_vers);
/* Set the ME bit */
tmp = sh64_in64(DMAC_COMMON_BASE);
tmp |= DMAC_COMMON_ME;
sh64_out64(tmp, DMAC_COMMON_BASE);
/* Enable the DMAC Error Interrupt */
make_intc_irq(DMA_IRQ_DERR);
setup_irq(DMA_IRQ_DERR, &irq_derr);
return 0;
}
static void __exit exit_dma(void)
{
onchip_unmap(dmac_base);
free_irq(DMA_IRQ_DERR, 0);
}
module_init(init_dma);
module_exit(exit_dma);
MODULE_AUTHOR("Paul Mundt");
MODULE_DESCRIPTION("DMA API for SH-5 DMAC");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(setup_dma);
EXPORT_SYMBOL(claim_dma_lock);
EXPORT_SYMBOL(release_dma_lock);
EXPORT_SYMBOL(enable_dma);
EXPORT_SYMBOL(disable_dma);
EXPORT_SYMBOL(set_dma_mode);
EXPORT_SYMBOL(set_dma_addr);
EXPORT_SYMBOL(set_dma_count);
EXPORT_SYMBOL(get_dma_residue);
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