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linux-pinenote/arch/arm/plat-omap/dma.c
Chen Gang e78f96060f ARM: OMAP: Fix the use of uninitialized dma_lch_count 
'omap_dma_reserve_channels' when used is suppose to be from command.
    so, it alreay has value before 1st call of omap_system_dma_probe.
    and it will never be changed again during running (not from ioctl).

  but 'dma_lch_count' is zero before 1st call of omap_system_dma_probe.
    so it will be failed for omap_dma_reserve_channels, when 1st call.

  so, need use 'd->lch_count' instead of 'dma_lch_count' for judging.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2013-02-01 14:39:54 -08:00

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/*
* linux/arch/arm/plat-omap/dma.c
*
* Copyright (C) 2003 - 2008 Nokia Corporation
* Author: Juha Yrjölä <juha.yrjola@nokia.com>
* DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
* Graphics DMA and LCD DMA graphics tranformations
* by Imre Deak <imre.deak@nokia.com>
* OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
* Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
* Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* Support functions for the OMAP internal DMA channels.
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
* Converted DMA library into DMA platform driver.
* - G, Manjunath Kondaiah <manjugk@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/omap-dma.h>
/*
* MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
* channels that an instance of the SDMA IP block can support. Used
* to size arrays. (The actual maximum on a particular SoC may be less
* than this -- for example, OMAP1 SDMA instances only support 17 logical
* DMA channels.)
*/
#define MAX_LOGICAL_DMA_CH_COUNT 32
#undef DEBUG
#ifndef CONFIG_ARCH_OMAP1
enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
};
enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
#endif
#define OMAP_DMA_ACTIVE 0x01
#define OMAP2_DMA_CSR_CLEAR_MASK 0xffffffff
#define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
static struct omap_system_dma_plat_info *p;
static struct omap_dma_dev_attr *d;
static int enable_1510_mode;
static u32 errata;
static struct omap_dma_global_context_registers {
u32 dma_irqenable_l0;
u32 dma_ocp_sysconfig;
u32 dma_gcr;
} omap_dma_global_context;
struct dma_link_info {
int *linked_dmach_q;
int no_of_lchs_linked;
int q_count;
int q_tail;
int q_head;
int chain_state;
int chain_mode;
};
static struct dma_link_info *dma_linked_lch;
#ifndef CONFIG_ARCH_OMAP1
/* Chain handling macros */
#define OMAP_DMA_CHAIN_QINIT(chain_id) \
do { \
dma_linked_lch[chain_id].q_head = \
dma_linked_lch[chain_id].q_tail = \
dma_linked_lch[chain_id].q_count = 0; \
} while (0)
#define OMAP_DMA_CHAIN_QFULL(chain_id) \
(dma_linked_lch[chain_id].no_of_lchs_linked == \
dma_linked_lch[chain_id].q_count)
#define OMAP_DMA_CHAIN_QLAST(chain_id) \
do { \
((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
dma_linked_lch[chain_id].q_count) \
} while (0)
#define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
(0 == dma_linked_lch[chain_id].q_count)
#define __OMAP_DMA_CHAIN_INCQ(end) \
((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
#define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
do { \
__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
dma_linked_lch[chain_id].q_count--; \
} while (0)
#define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
do { \
__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
dma_linked_lch[chain_id].q_count++; \
} while (0)
#endif
static int dma_lch_count;
static int dma_chan_count;
static int omap_dma_reserve_channels;
static spinlock_t dma_chan_lock;
static struct omap_dma_lch *dma_chan;
static inline void disable_lnk(int lch);
static void omap_disable_channel_irq(int lch);
static inline void omap_enable_channel_irq(int lch);
#define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
__func__);
#ifdef CONFIG_ARCH_OMAP15XX
/* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
static int omap_dma_in_1510_mode(void)
{
return enable_1510_mode;
}
#else
#define omap_dma_in_1510_mode() 0
#endif
#ifdef CONFIG_ARCH_OMAP1
static inline int get_gdma_dev(int req)
{
u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
int shift = ((req - 1) % 5) * 6;
return ((omap_readl(reg) >> shift) & 0x3f) + 1;
}
static inline void set_gdma_dev(int req, int dev)
{
u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
int shift = ((req - 1) % 5) * 6;
u32 l;
l = omap_readl(reg);
l &= ~(0x3f << shift);
l |= (dev - 1) << shift;
omap_writel(l, reg);
}
#else
#define set_gdma_dev(req, dev) do {} while (0)
#define omap_readl(reg) 0
#define omap_writel(val, reg) do {} while (0)
#endif
#ifdef CONFIG_ARCH_OMAP1
void omap_set_dma_priority(int lch, int dst_port, int priority)
{
unsigned long reg;
u32 l;
if (dma_omap1()) {
switch (dst_port) {
case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
reg = OMAP_TC_OCPT1_PRIOR;
break;
case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
reg = OMAP_TC_OCPT2_PRIOR;
break;
case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
reg = OMAP_TC_EMIFF_PRIOR;
break;
case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
reg = OMAP_TC_EMIFS_PRIOR;
break;
default:
BUG();
return;
}
l = omap_readl(reg);
l &= ~(0xf << 8);
l |= (priority & 0xf) << 8;
omap_writel(l, reg);
}
}
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
void omap_set_dma_priority(int lch, int dst_port, int priority)
{
u32 ccr;
ccr = p->dma_read(CCR, lch);
if (priority)
ccr |= (1 << 6);
else
ccr &= ~(1 << 6);
p->dma_write(ccr, CCR, lch);
}
#endif
EXPORT_SYMBOL(omap_set_dma_priority);
void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
int frame_count, int sync_mode,
int dma_trigger, int src_or_dst_synch)
{
u32 l;
l = p->dma_read(CSDP, lch);
l &= ~0x03;
l |= data_type;
p->dma_write(l, CSDP, lch);
if (dma_omap1()) {
u16 ccr;
ccr = p->dma_read(CCR, lch);
ccr &= ~(1 << 5);
if (sync_mode == OMAP_DMA_SYNC_FRAME)
ccr |= 1 << 5;
p->dma_write(ccr, CCR, lch);
ccr = p->dma_read(CCR2, lch);
ccr &= ~(1 << 2);
if (sync_mode == OMAP_DMA_SYNC_BLOCK)
ccr |= 1 << 2;
p->dma_write(ccr, CCR2, lch);
}
if (dma_omap2plus() && dma_trigger) {
u32 val;
val = p->dma_read(CCR, lch);
/* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
val &= ~((1 << 23) | (3 << 19) | 0x1f);
val |= (dma_trigger & ~0x1f) << 14;
val |= dma_trigger & 0x1f;
if (sync_mode & OMAP_DMA_SYNC_FRAME)
val |= 1 << 5;
else
val &= ~(1 << 5);
if (sync_mode & OMAP_DMA_SYNC_BLOCK)
val |= 1 << 18;
else
val &= ~(1 << 18);
if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
val &= ~(1 << 24); /* dest synch */
val |= (1 << 23); /* Prefetch */
} else if (src_or_dst_synch) {
val |= 1 << 24; /* source synch */
} else {
val &= ~(1 << 24); /* dest synch */
}
p->dma_write(val, CCR, lch);
}
p->dma_write(elem_count, CEN, lch);
p->dma_write(frame_count, CFN, lch);
}
EXPORT_SYMBOL(omap_set_dma_transfer_params);
void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
{
BUG_ON(omap_dma_in_1510_mode());
if (dma_omap1()) {
u16 w;
w = p->dma_read(CCR2, lch);
w &= ~0x03;
switch (mode) {
case OMAP_DMA_CONSTANT_FILL:
w |= 0x01;
break;
case OMAP_DMA_TRANSPARENT_COPY:
w |= 0x02;
break;
case OMAP_DMA_COLOR_DIS:
break;
default:
BUG();
}
p->dma_write(w, CCR2, lch);
w = p->dma_read(LCH_CTRL, lch);
w &= ~0x0f;
/* Default is channel type 2D */
if (mode) {
p->dma_write(color, COLOR, lch);
w |= 1; /* Channel type G */
}
p->dma_write(w, LCH_CTRL, lch);
}
if (dma_omap2plus()) {
u32 val;
val = p->dma_read(CCR, lch);
val &= ~((1 << 17) | (1 << 16));
switch (mode) {
case OMAP_DMA_CONSTANT_FILL:
val |= 1 << 16;
break;
case OMAP_DMA_TRANSPARENT_COPY:
val |= 1 << 17;
break;
case OMAP_DMA_COLOR_DIS:
break;
default:
BUG();
}
p->dma_write(val, CCR, lch);
color &= 0xffffff;
p->dma_write(color, COLOR, lch);
}
}
EXPORT_SYMBOL(omap_set_dma_color_mode);
void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
{
if (dma_omap2plus()) {
u32 csdp;
csdp = p->dma_read(CSDP, lch);
csdp &= ~(0x3 << 16);
csdp |= (mode << 16);
p->dma_write(csdp, CSDP, lch);
}
}
EXPORT_SYMBOL(omap_set_dma_write_mode);
void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
{
if (dma_omap1() && !dma_omap15xx()) {
u32 l;
l = p->dma_read(LCH_CTRL, lch);
l &= ~0x7;
l |= mode;
p->dma_write(l, LCH_CTRL, lch);
}
}
EXPORT_SYMBOL(omap_set_dma_channel_mode);
/* Note that src_port is only for omap1 */
void omap_set_dma_src_params(int lch, int src_port, int src_amode,
unsigned long src_start,
int src_ei, int src_fi)
{
u32 l;
if (dma_omap1()) {
u16 w;
w = p->dma_read(CSDP, lch);
w &= ~(0x1f << 2);
w |= src_port << 2;
p->dma_write(w, CSDP, lch);
}
l = p->dma_read(CCR, lch);
l &= ~(0x03 << 12);
l |= src_amode << 12;
p->dma_write(l, CCR, lch);
p->dma_write(src_start, CSSA, lch);
p->dma_write(src_ei, CSEI, lch);
p->dma_write(src_fi, CSFI, lch);
}
EXPORT_SYMBOL(omap_set_dma_src_params);
void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
{
omap_set_dma_transfer_params(lch, params->data_type,
params->elem_count, params->frame_count,
params->sync_mode, params->trigger,
params->src_or_dst_synch);
omap_set_dma_src_params(lch, params->src_port,
params->src_amode, params->src_start,
params->src_ei, params->src_fi);
omap_set_dma_dest_params(lch, params->dst_port,
params->dst_amode, params->dst_start,
params->dst_ei, params->dst_fi);
if (params->read_prio || params->write_prio)
omap_dma_set_prio_lch(lch, params->read_prio,
params->write_prio);
}
EXPORT_SYMBOL(omap_set_dma_params);
void omap_set_dma_src_index(int lch, int eidx, int fidx)
{
if (dma_omap2plus())
return;
p->dma_write(eidx, CSEI, lch);
p->dma_write(fidx, CSFI, lch);
}
EXPORT_SYMBOL(omap_set_dma_src_index);
void omap_set_dma_src_data_pack(int lch, int enable)
{
u32 l;
l = p->dma_read(CSDP, lch);
l &= ~(1 << 6);
if (enable)
l |= (1 << 6);
p->dma_write(l, CSDP, lch);
}
EXPORT_SYMBOL(omap_set_dma_src_data_pack);
void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
{
unsigned int burst = 0;
u32 l;
l = p->dma_read(CSDP, lch);
l &= ~(0x03 << 7);
switch (burst_mode) {
case OMAP_DMA_DATA_BURST_DIS:
break;
case OMAP_DMA_DATA_BURST_4:
if (dma_omap2plus())
burst = 0x1;
else
burst = 0x2;
break;
case OMAP_DMA_DATA_BURST_8:
if (dma_omap2plus()) {
burst = 0x2;
break;
}
/*
* not supported by current hardware on OMAP1
* w |= (0x03 << 7);
* fall through
*/
case OMAP_DMA_DATA_BURST_16:
if (dma_omap2plus()) {
burst = 0x3;
break;
}
/*
* OMAP1 don't support burst 16
* fall through
*/
default:
BUG();
}
l |= (burst << 7);
p->dma_write(l, CSDP, lch);
}
EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
/* Note that dest_port is only for OMAP1 */
void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
unsigned long dest_start,
int dst_ei, int dst_fi)
{
u32 l;
if (dma_omap1()) {
l = p->dma_read(CSDP, lch);
l &= ~(0x1f << 9);
l |= dest_port << 9;
p->dma_write(l, CSDP, lch);
}
l = p->dma_read(CCR, lch);
l &= ~(0x03 << 14);
l |= dest_amode << 14;
p->dma_write(l, CCR, lch);
p->dma_write(dest_start, CDSA, lch);
p->dma_write(dst_ei, CDEI, lch);
p->dma_write(dst_fi, CDFI, lch);
}
EXPORT_SYMBOL(omap_set_dma_dest_params);
void omap_set_dma_dest_index(int lch, int eidx, int fidx)
{
if (dma_omap2plus())
return;
p->dma_write(eidx, CDEI, lch);
p->dma_write(fidx, CDFI, lch);
}
EXPORT_SYMBOL(omap_set_dma_dest_index);
void omap_set_dma_dest_data_pack(int lch, int enable)
{
u32 l;
l = p->dma_read(CSDP, lch);
l &= ~(1 << 13);
if (enable)
l |= 1 << 13;
p->dma_write(l, CSDP, lch);
}
EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
{
unsigned int burst = 0;
u32 l;
l = p->dma_read(CSDP, lch);
l &= ~(0x03 << 14);
switch (burst_mode) {
case OMAP_DMA_DATA_BURST_DIS:
break;
case OMAP_DMA_DATA_BURST_4:
if (dma_omap2plus())
burst = 0x1;
else
burst = 0x2;
break;
case OMAP_DMA_DATA_BURST_8:
if (dma_omap2plus())
burst = 0x2;
else
burst = 0x3;
break;
case OMAP_DMA_DATA_BURST_16:
if (dma_omap2plus()) {
burst = 0x3;
break;
}
/*
* OMAP1 don't support burst 16
* fall through
*/
default:
printk(KERN_ERR "Invalid DMA burst mode\n");
BUG();
return;
}
l |= (burst << 14);
p->dma_write(l, CSDP, lch);
}
EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
static inline void omap_enable_channel_irq(int lch)
{
/* Clear CSR */
if (dma_omap1())
p->dma_read(CSR, lch);
else
p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
/* Enable some nice interrupts. */
p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
}
static inline void omap_disable_channel_irq(int lch)
{
/* disable channel interrupts */
p->dma_write(0, CICR, lch);
/* Clear CSR */
if (dma_omap1())
p->dma_read(CSR, lch);
else
p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
}
void omap_enable_dma_irq(int lch, u16 bits)
{
dma_chan[lch].enabled_irqs |= bits;
}
EXPORT_SYMBOL(omap_enable_dma_irq);
void omap_disable_dma_irq(int lch, u16 bits)
{
dma_chan[lch].enabled_irqs &= ~bits;
}
EXPORT_SYMBOL(omap_disable_dma_irq);
static inline void enable_lnk(int lch)
{
u32 l;
l = p->dma_read(CLNK_CTRL, lch);
if (dma_omap1())
l &= ~(1 << 14);
/* Set the ENABLE_LNK bits */
if (dma_chan[lch].next_lch != -1)
l = dma_chan[lch].next_lch | (1 << 15);
#ifndef CONFIG_ARCH_OMAP1
if (dma_omap2plus())
if (dma_chan[lch].next_linked_ch != -1)
l = dma_chan[lch].next_linked_ch | (1 << 15);
#endif
p->dma_write(l, CLNK_CTRL, lch);
}
static inline void disable_lnk(int lch)
{
u32 l;
l = p->dma_read(CLNK_CTRL, lch);
/* Disable interrupts */
omap_disable_channel_irq(lch);
if (dma_omap1()) {
/* Set the STOP_LNK bit */
l |= 1 << 14;
}
if (dma_omap2plus()) {
/* Clear the ENABLE_LNK bit */
l &= ~(1 << 15);
}
p->dma_write(l, CLNK_CTRL, lch);
dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
}
static inline void omap2_enable_irq_lch(int lch)
{
u32 val;
unsigned long flags;
if (dma_omap1())
return;
spin_lock_irqsave(&dma_chan_lock, flags);
/* clear IRQ STATUS */
p->dma_write(1 << lch, IRQSTATUS_L0, lch);
/* Enable interrupt */
val = p->dma_read(IRQENABLE_L0, lch);
val |= 1 << lch;
p->dma_write(val, IRQENABLE_L0, lch);
spin_unlock_irqrestore(&dma_chan_lock, flags);
}
static inline void omap2_disable_irq_lch(int lch)
{
u32 val;
unsigned long flags;
if (dma_omap1())
return;
spin_lock_irqsave(&dma_chan_lock, flags);
/* Disable interrupt */
val = p->dma_read(IRQENABLE_L0, lch);
val &= ~(1 << lch);
p->dma_write(val, IRQENABLE_L0, lch);
/* clear IRQ STATUS */
p->dma_write(1 << lch, IRQSTATUS_L0, lch);
spin_unlock_irqrestore(&dma_chan_lock, flags);
}
int omap_request_dma(int dev_id, const char *dev_name,
void (*callback)(int lch, u16 ch_status, void *data),
void *data, int *dma_ch_out)
{
int ch, free_ch = -1;
unsigned long flags;
struct omap_dma_lch *chan;
spin_lock_irqsave(&dma_chan_lock, flags);
for (ch = 0; ch < dma_chan_count; ch++) {
if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
free_ch = ch;
if (dev_id == 0)
break;
}
}
if (free_ch == -1) {
spin_unlock_irqrestore(&dma_chan_lock, flags);
return -EBUSY;
}
chan = dma_chan + free_ch;
chan->dev_id = dev_id;
if (p->clear_lch_regs)
p->clear_lch_regs(free_ch);
if (dma_omap2plus())
omap_clear_dma(free_ch);
spin_unlock_irqrestore(&dma_chan_lock, flags);
chan->dev_name = dev_name;
chan->callback = callback;
chan->data = data;
chan->flags = 0;
#ifndef CONFIG_ARCH_OMAP1
if (dma_omap2plus()) {
chan->chain_id = -1;
chan->next_linked_ch = -1;
}
#endif
chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
if (dma_omap1())
chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
else if (dma_omap2plus())
chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
OMAP2_DMA_TRANS_ERR_IRQ;
if (dma_omap16xx()) {
/* If the sync device is set, configure it dynamically. */
if (dev_id != 0) {
set_gdma_dev(free_ch + 1, dev_id);
dev_id = free_ch + 1;
}
/*
* Disable the 1510 compatibility mode and set the sync device
* id.
*/
p->dma_write(dev_id | (1 << 10), CCR, free_ch);
} else if (dma_omap1()) {
p->dma_write(dev_id, CCR, free_ch);
}
if (dma_omap2plus()) {
omap_enable_channel_irq(free_ch);
omap2_enable_irq_lch(free_ch);
}
*dma_ch_out = free_ch;
return 0;
}
EXPORT_SYMBOL(omap_request_dma);
void omap_free_dma(int lch)
{
unsigned long flags;
if (dma_chan[lch].dev_id == -1) {
pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
lch);
return;
}
/* Disable interrupt for logical channel */
if (dma_omap2plus())
omap2_disable_irq_lch(lch);
/* Disable all DMA interrupts for the channel. */
omap_disable_channel_irq(lch);
/* Make sure the DMA transfer is stopped. */
p->dma_write(0, CCR, lch);
/* Clear registers */
if (dma_omap2plus())
omap_clear_dma(lch);
spin_lock_irqsave(&dma_chan_lock, flags);
dma_chan[lch].dev_id = -1;
dma_chan[lch].next_lch = -1;
dma_chan[lch].callback = NULL;
spin_unlock_irqrestore(&dma_chan_lock, flags);
}
EXPORT_SYMBOL(omap_free_dma);
/**
* @brief omap_dma_set_global_params : Set global priority settings for dma
*
* @param arb_rate
* @param max_fifo_depth
* @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
* DMA_THREAD_RESERVE_ONET
* DMA_THREAD_RESERVE_TWOT
* DMA_THREAD_RESERVE_THREET
*/
void
omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
{
u32 reg;
if (dma_omap1()) {
printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
return;
}
if (max_fifo_depth == 0)
max_fifo_depth = 1;
if (arb_rate == 0)
arb_rate = 1;
reg = 0xff & max_fifo_depth;
reg |= (0x3 & tparams) << 12;
reg |= (arb_rate & 0xff) << 16;
p->dma_write(reg, GCR, 0);
}
EXPORT_SYMBOL(omap_dma_set_global_params);
/**
* @brief omap_dma_set_prio_lch : Set channel wise priority settings
*
* @param lch
* @param read_prio - Read priority
* @param write_prio - Write priority
* Both of the above can be set with one of the following values :
* DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
*/
int
omap_dma_set_prio_lch(int lch, unsigned char read_prio,
unsigned char write_prio)
{
u32 l;
if (unlikely((lch < 0 || lch >= dma_lch_count))) {
printk(KERN_ERR "Invalid channel id\n");
return -EINVAL;
}
l = p->dma_read(CCR, lch);
l &= ~((1 << 6) | (1 << 26));
if (d->dev_caps & IS_RW_PRIORITY)
l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
else
l |= ((read_prio & 0x1) << 6);
p->dma_write(l, CCR, lch);
return 0;
}
EXPORT_SYMBOL(omap_dma_set_prio_lch);
/*
* Clears any DMA state so the DMA engine is ready to restart with new buffers
* through omap_start_dma(). Any buffers in flight are discarded.
*/
void omap_clear_dma(int lch)
{
unsigned long flags;
local_irq_save(flags);
p->clear_dma(lch);
local_irq_restore(flags);
}
EXPORT_SYMBOL(omap_clear_dma);
void omap_start_dma(int lch)
{
u32 l;
/*
* The CPC/CDAC register needs to be initialized to zero
* before starting dma transfer.
*/
if (dma_omap15xx())
p->dma_write(0, CPC, lch);
else
p->dma_write(0, CDAC, lch);
if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
int next_lch, cur_lch;
char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
dma_chan_link_map[lch] = 1;
/* Set the link register of the first channel */
enable_lnk(lch);
memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
cur_lch = dma_chan[lch].next_lch;
do {
next_lch = dma_chan[cur_lch].next_lch;
/* The loop case: we've been here already */
if (dma_chan_link_map[cur_lch])
break;
/* Mark the current channel */
dma_chan_link_map[cur_lch] = 1;
enable_lnk(cur_lch);
omap_enable_channel_irq(cur_lch);
cur_lch = next_lch;
} while (next_lch != -1);
} else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
p->dma_write(lch, CLNK_CTRL, lch);
omap_enable_channel_irq(lch);
l = p->dma_read(CCR, lch);
if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
l |= OMAP_DMA_CCR_EN;
/*
* As dma_write() uses IO accessors which are weakly ordered, there
* is no guarantee that data in coherent DMA memory will be visible
* to the DMA device. Add a memory barrier here to ensure that any
* such data is visible prior to enabling DMA.
*/
mb();
p->dma_write(l, CCR, lch);
dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
}
EXPORT_SYMBOL(omap_start_dma);
void omap_stop_dma(int lch)
{
u32 l;
/* Disable all interrupts on the channel */
omap_disable_channel_irq(lch);
l = p->dma_read(CCR, lch);
if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
(l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
int i = 0;
u32 sys_cf;
/* Configure No-Standby */
l = p->dma_read(OCP_SYSCONFIG, lch);
sys_cf = l;
l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
p->dma_write(l , OCP_SYSCONFIG, 0);
l = p->dma_read(CCR, lch);
l &= ~OMAP_DMA_CCR_EN;
p->dma_write(l, CCR, lch);
/* Wait for sDMA FIFO drain */
l = p->dma_read(CCR, lch);
while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
OMAP_DMA_CCR_WR_ACTIVE))) {
udelay(5);
i++;
l = p->dma_read(CCR, lch);
}
if (i >= 100)
pr_err("DMA drain did not complete on lch %d\n", lch);
/* Restore OCP_SYSCONFIG */
p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
} else {
l &= ~OMAP_DMA_CCR_EN;
p->dma_write(l, CCR, lch);
}
/*
* Ensure that data transferred by DMA is visible to any access
* after DMA has been disabled. This is important for coherent
* DMA regions.
*/
mb();
if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
int next_lch, cur_lch = lch;
char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
do {
/* The loop case: we've been here already */
if (dma_chan_link_map[cur_lch])
break;
/* Mark the current channel */
dma_chan_link_map[cur_lch] = 1;
disable_lnk(cur_lch);
next_lch = dma_chan[cur_lch].next_lch;
cur_lch = next_lch;
} while (next_lch != -1);
}
dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
}
EXPORT_SYMBOL(omap_stop_dma);
/*
* Allows changing the DMA callback function or data. This may be needed if
* the driver shares a single DMA channel for multiple dma triggers.
*/
int omap_set_dma_callback(int lch,
void (*callback)(int lch, u16 ch_status, void *data),
void *data)
{
unsigned long flags;
if (lch < 0)
return -ENODEV;
spin_lock_irqsave(&dma_chan_lock, flags);
if (dma_chan[lch].dev_id == -1) {
printk(KERN_ERR "DMA callback for not set for free channel\n");
spin_unlock_irqrestore(&dma_chan_lock, flags);
return -EINVAL;
}
dma_chan[lch].callback = callback;
dma_chan[lch].data = data;
spin_unlock_irqrestore(&dma_chan_lock, flags);
return 0;
}
EXPORT_SYMBOL(omap_set_dma_callback);
/*
* Returns current physical source address for the given DMA channel.
* If the channel is running the caller must disable interrupts prior calling
* this function and process the returned value before re-enabling interrupt to
* prevent races with the interrupt handler. Note that in continuous mode there
* is a chance for CSSA_L register overflow between the two reads resulting
* in incorrect return value.
*/
dma_addr_t omap_get_dma_src_pos(int lch)
{
dma_addr_t offset = 0;
if (dma_omap15xx())
offset = p->dma_read(CPC, lch);
else
offset = p->dma_read(CSAC, lch);
if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
offset = p->dma_read(CSAC, lch);
if (!dma_omap15xx()) {
/*
* CDAC == 0 indicates that the DMA transfer on the channel has
* not been started (no data has been transferred so far).
* Return the programmed source start address in this case.
*/
if (likely(p->dma_read(CDAC, lch)))
offset = p->dma_read(CSAC, lch);
else
offset = p->dma_read(CSSA, lch);
}
if (dma_omap1())
offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
return offset;
}
EXPORT_SYMBOL(omap_get_dma_src_pos);
/*
* Returns current physical destination address for the given DMA channel.
* If the channel is running the caller must disable interrupts prior calling
* this function and process the returned value before re-enabling interrupt to
* prevent races with the interrupt handler. Note that in continuous mode there
* is a chance for CDSA_L register overflow between the two reads resulting
* in incorrect return value.
*/
dma_addr_t omap_get_dma_dst_pos(int lch)
{
dma_addr_t offset = 0;
if (dma_omap15xx())
offset = p->dma_read(CPC, lch);
else
offset = p->dma_read(CDAC, lch);
/*
* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
* read before the DMA controller finished disabling the channel.
*/
if (!dma_omap15xx() && offset == 0) {
offset = p->dma_read(CDAC, lch);
/*
* CDAC == 0 indicates that the DMA transfer on the channel has
* not been started (no data has been transferred so far).
* Return the programmed destination start address in this case.
*/
if (unlikely(!offset))
offset = p->dma_read(CDSA, lch);
}
if (dma_omap1())
offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
return offset;
}
EXPORT_SYMBOL(omap_get_dma_dst_pos);
int omap_get_dma_active_status(int lch)
{
return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
}
EXPORT_SYMBOL(omap_get_dma_active_status);
int omap_dma_running(void)
{
int lch;
if (dma_omap1())
if (omap_lcd_dma_running())
return 1;
for (lch = 0; lch < dma_chan_count; lch++)
if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
return 1;
return 0;
}
/*
* lch_queue DMA will start right after lch_head one is finished.
* For this DMA link to start, you still need to start (see omap_start_dma)
* the first one. That will fire up the entire queue.
*/
void omap_dma_link_lch(int lch_head, int lch_queue)
{
if (omap_dma_in_1510_mode()) {
if (lch_head == lch_queue) {
p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
CCR, lch_head);
return;
}
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG();
return;
}
if ((dma_chan[lch_head].dev_id == -1) ||
(dma_chan[lch_queue].dev_id == -1)) {
pr_err("omap_dma: trying to link non requested channels\n");
dump_stack();
}
dma_chan[lch_head].next_lch = lch_queue;
}
EXPORT_SYMBOL(omap_dma_link_lch);
/*
* Once the DMA queue is stopped, we can destroy it.
*/
void omap_dma_unlink_lch(int lch_head, int lch_queue)
{
if (omap_dma_in_1510_mode()) {
if (lch_head == lch_queue) {
p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
CCR, lch_head);
return;
}
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG();
return;
}
if (dma_chan[lch_head].next_lch != lch_queue ||
dma_chan[lch_head].next_lch == -1) {
pr_err("omap_dma: trying to unlink non linked channels\n");
dump_stack();
}
if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
(dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
pr_err("omap_dma: You need to stop the DMA channels before unlinking\n");
dump_stack();
}
dma_chan[lch_head].next_lch = -1;
}
EXPORT_SYMBOL(omap_dma_unlink_lch);
#ifndef CONFIG_ARCH_OMAP1
/* Create chain of DMA channesls */
static void create_dma_lch_chain(int lch_head, int lch_queue)
{
u32 l;
/* Check if this is the first link in chain */
if (dma_chan[lch_head].next_linked_ch == -1) {
dma_chan[lch_head].next_linked_ch = lch_queue;
dma_chan[lch_head].prev_linked_ch = lch_queue;
dma_chan[lch_queue].next_linked_ch = lch_head;
dma_chan[lch_queue].prev_linked_ch = lch_head;
}
/* a link exists, link the new channel in circular chain */
else {
dma_chan[lch_queue].next_linked_ch =
dma_chan[lch_head].next_linked_ch;
dma_chan[lch_queue].prev_linked_ch = lch_head;
dma_chan[lch_head].next_linked_ch = lch_queue;
dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
lch_queue;
}
l = p->dma_read(CLNK_CTRL, lch_head);
l &= ~(0x1f);
l |= lch_queue;
p->dma_write(l, CLNK_CTRL, lch_head);
l = p->dma_read(CLNK_CTRL, lch_queue);
l &= ~(0x1f);
l |= (dma_chan[lch_queue].next_linked_ch);
p->dma_write(l, CLNK_CTRL, lch_queue);
}
/**
* @brief omap_request_dma_chain : Request a chain of DMA channels
*
* @param dev_id - Device id using the dma channel
* @param dev_name - Device name
* @param callback - Call back function
* @chain_id -
* @no_of_chans - Number of channels requested
* @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
* OMAP_DMA_DYNAMIC_CHAIN
* @params - Channel parameters
*
* @return - Success : 0
* Failure: -EINVAL/-ENOMEM
*/
int omap_request_dma_chain(int dev_id, const char *dev_name,
void (*callback) (int lch, u16 ch_status,
void *data),
int *chain_id, int no_of_chans, int chain_mode,
struct omap_dma_channel_params params)
{
int *channels;
int i, err;
/* Is the chain mode valid ? */
if (chain_mode != OMAP_DMA_STATIC_CHAIN
&& chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
printk(KERN_ERR "Invalid chain mode requested\n");
return -EINVAL;
}
if (unlikely((no_of_chans < 1
|| no_of_chans > dma_lch_count))) {
printk(KERN_ERR "Invalid Number of channels requested\n");
return -EINVAL;
}
/*
* Allocate a queue to maintain the status of the channels
* in the chain
*/
channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
if (channels == NULL) {
printk(KERN_ERR "omap_dma: No memory for channel queue\n");
return -ENOMEM;
}
/* request and reserve DMA channels for the chain */
for (i = 0; i < no_of_chans; i++) {
err = omap_request_dma(dev_id, dev_name,
callback, NULL, &channels[i]);
if (err < 0) {
int j;
for (j = 0; j < i; j++)
omap_free_dma(channels[j]);
kfree(channels);
printk(KERN_ERR "omap_dma: Request failed %d\n", err);
return err;
}
dma_chan[channels[i]].prev_linked_ch = -1;
dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
/*
* Allowing client drivers to set common parameters now,
* so that later only relevant (src_start, dest_start
* and element count) can be set
*/
omap_set_dma_params(channels[i], &params);
}
*chain_id = channels[0];
dma_linked_lch[*chain_id].linked_dmach_q = channels;
dma_linked_lch[*chain_id].chain_mode = chain_mode;
dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
for (i = 0; i < no_of_chans; i++)
dma_chan[channels[i]].chain_id = *chain_id;
/* Reset the Queue pointers */
OMAP_DMA_CHAIN_QINIT(*chain_id);
/* Set up the chain */
if (no_of_chans == 1)
create_dma_lch_chain(channels[0], channels[0]);
else {
for (i = 0; i < (no_of_chans - 1); i++)
create_dma_lch_chain(channels[i], channels[i + 1]);
}
return 0;
}
EXPORT_SYMBOL(omap_request_dma_chain);
/**
* @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
* params after setting it. Dont do this while dma is running!!
*
* @param chain_id - Chained logical channel id.
* @param params
*
* @return - Success : 0
* Failure : -EINVAL
*/
int omap_modify_dma_chain_params(int chain_id,
struct omap_dma_channel_params params)
{
int *channels;
u32 i;
/* Check for input params */
if (unlikely((chain_id < 0
|| chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
/*
* Allowing client drivers to set common parameters now,
* so that later only relevant (src_start, dest_start
* and element count) can be set
*/
omap_set_dma_params(channels[i], &params);
}
return 0;
}
EXPORT_SYMBOL(omap_modify_dma_chain_params);
/**
* @brief omap_free_dma_chain - Free all the logical channels in a chain.
*
* @param chain_id
*
* @return - Success : 0
* Failure : -EINVAL
*/
int omap_free_dma_chain(int chain_id)
{
int *channels;
u32 i;
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
dma_chan[channels[i]].next_linked_ch = -1;
dma_chan[channels[i]].prev_linked_ch = -1;
dma_chan[channels[i]].chain_id = -1;
dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
omap_free_dma(channels[i]);
}
kfree(channels);
dma_linked_lch[chain_id].linked_dmach_q = NULL;
dma_linked_lch[chain_id].chain_mode = -1;
dma_linked_lch[chain_id].chain_state = -1;
return (0);
}
EXPORT_SYMBOL(omap_free_dma_chain);
/**
* @brief omap_dma_chain_status - Check if the chain is in
* active / inactive state.
* @param chain_id
*
* @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
* Failure : -EINVAL
*/
int omap_dma_chain_status(int chain_id)
{
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
dma_linked_lch[chain_id].q_count);
if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
return OMAP_DMA_CHAIN_INACTIVE;
return OMAP_DMA_CHAIN_ACTIVE;
}
EXPORT_SYMBOL(omap_dma_chain_status);
/**
* @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
* set the params and start the transfer.
*
* @param chain_id
* @param src_start - buffer start address
* @param dest_start - Dest address
* @param elem_count
* @param frame_count
* @param callbk_data - channel callback parameter data.
*
* @return - Success : 0
* Failure: -EINVAL/-EBUSY
*/
int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
int elem_count, int frame_count, void *callbk_data)
{
int *channels;
u32 l, lch;
int start_dma = 0;
/*
* if buffer size is less than 1 then there is
* no use of starting the chain
*/
if (elem_count < 1) {
printk(KERN_ERR "Invalid buffer size\n");
return -EINVAL;
}
/* Check for input params */
if (unlikely((chain_id < 0
|| chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exist\n");
return -EINVAL;
}
/* Check if all the channels in chain are in use */
if (OMAP_DMA_CHAIN_QFULL(chain_id))
return -EBUSY;
/* Frame count may be negative in case of indexed transfers */
channels = dma_linked_lch[chain_id].linked_dmach_q;
/* Get a free channel */
lch = channels[dma_linked_lch[chain_id].q_tail];
/* Store the callback data */
dma_chan[lch].data = callbk_data;
/* Increment the q_tail */
OMAP_DMA_CHAIN_INCQTAIL(chain_id);
/* Set the params to the free channel */
if (src_start != 0)
p->dma_write(src_start, CSSA, lch);
if (dest_start != 0)
p->dma_write(dest_start, CDSA, lch);
/* Write the buffer size */
p->dma_write(elem_count, CEN, lch);
p->dma_write(frame_count, CFN, lch);
/*
* If the chain is dynamically linked,
* then we may have to start the chain if its not active
*/
if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
/*
* In Dynamic chain, if the chain is not started,
* queue the channel
*/
if (dma_linked_lch[chain_id].chain_state ==
DMA_CHAIN_NOTSTARTED) {
/* Enable the link in previous channel */
if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
DMA_CH_QUEUED)
enable_lnk(dma_chan[lch].prev_linked_ch);
dma_chan[lch].state = DMA_CH_QUEUED;
}
/*
* Chain is already started, make sure its active,
* if not then start the chain
*/
else {
start_dma = 1;
if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
DMA_CH_STARTED) {
enable_lnk(dma_chan[lch].prev_linked_ch);
dma_chan[lch].state = DMA_CH_QUEUED;
start_dma = 0;
if (0 == ((1 << 7) & p->dma_read(
CCR, dma_chan[lch].prev_linked_ch))) {
disable_lnk(dma_chan[lch].
prev_linked_ch);
pr_debug("\n prev ch is stopped\n");
start_dma = 1;
}
}
else if (dma_chan[dma_chan[lch].prev_linked_ch].state
== DMA_CH_QUEUED) {
enable_lnk(dma_chan[lch].prev_linked_ch);
dma_chan[lch].state = DMA_CH_QUEUED;
start_dma = 0;
}
omap_enable_channel_irq(lch);
l = p->dma_read(CCR, lch);
if ((0 == (l & (1 << 24))))
l &= ~(1 << 25);
else
l |= (1 << 25);
if (start_dma == 1) {
if (0 == (l & (1 << 7))) {
l |= (1 << 7);
dma_chan[lch].state = DMA_CH_STARTED;
pr_debug("starting %d\n", lch);
p->dma_write(l, CCR, lch);
} else
start_dma = 0;
} else {
if (0 == (l & (1 << 7)))
p->dma_write(l, CCR, lch);
}
dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
}
}
return 0;
}
EXPORT_SYMBOL(omap_dma_chain_a_transfer);
/**
* @brief omap_start_dma_chain_transfers - Start the chain
*
* @param chain_id
*
* @return - Success : 0
* Failure : -EINVAL/-EBUSY
*/
int omap_start_dma_chain_transfers(int chain_id)
{
int *channels;
u32 l, i;
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
printk(KERN_ERR "Chain is already started\n");
return -EBUSY;
}
if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
i++) {
enable_lnk(channels[i]);
omap_enable_channel_irq(channels[i]);
}
} else {
omap_enable_channel_irq(channels[0]);
}
l = p->dma_read(CCR, channels[0]);
l |= (1 << 7);
dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
dma_chan[channels[0]].state = DMA_CH_STARTED;
if ((0 == (l & (1 << 24))))
l &= ~(1 << 25);
else
l |= (1 << 25);
p->dma_write(l, CCR, channels[0]);
dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
return 0;
}
EXPORT_SYMBOL(omap_start_dma_chain_transfers);
/**
* @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
*
* @param chain_id
*
* @return - Success : 0
* Failure : EINVAL
*/
int omap_stop_dma_chain_transfers(int chain_id)
{
int *channels;
u32 l, i;
u32 sys_cf = 0;
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
l = sys_cf;
/* Middle mode reg set no Standby */
l &= ~((1 << 12)|(1 << 13));
p->dma_write(l, OCP_SYSCONFIG, 0);
}
for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
/* Stop the Channel transmission */
l = p->dma_read(CCR, channels[i]);
l &= ~(1 << 7);
p->dma_write(l, CCR, channels[i]);
/* Disable the link in all the channels */
disable_lnk(channels[i]);
dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
}
dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
/* Reset the Queue pointers */
OMAP_DMA_CHAIN_QINIT(chain_id);
if (IS_DMA_ERRATA(DMA_ERRATA_i88))
p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
return 0;
}
EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
/* Get the index of the ongoing DMA in chain */
/**
* @brief omap_get_dma_chain_index - Get the element and frame index
* of the ongoing DMA in chain
*
* @param chain_id
* @param ei - Element index
* @param fi - Frame index
*
* @return - Success : 0
* Failure : -EINVAL
*/
int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
{
int lch;
int *channels;
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
if ((!ei) || (!fi))
return -EINVAL;
channels = dma_linked_lch[chain_id].linked_dmach_q;
/* Get the current channel */
lch = channels[dma_linked_lch[chain_id].q_head];
*ei = p->dma_read(CCEN, lch);
*fi = p->dma_read(CCFN, lch);
return 0;
}
EXPORT_SYMBOL(omap_get_dma_chain_index);
/**
* @brief omap_get_dma_chain_dst_pos - Get the destination position of the
* ongoing DMA in chain
*
* @param chain_id
*
* @return - Success : Destination position
* Failure : -EINVAL
*/
int omap_get_dma_chain_dst_pos(int chain_id)
{
int lch;
int *channels;
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
/* Get the current channel */
lch = channels[dma_linked_lch[chain_id].q_head];
return p->dma_read(CDAC, lch);
}
EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
/**
* @brief omap_get_dma_chain_src_pos - Get the source position
* of the ongoing DMA in chain
* @param chain_id
*
* @return - Success : Destination position
* Failure : -EINVAL
*/
int omap_get_dma_chain_src_pos(int chain_id)
{
int lch;
int *channels;
/* Check for input params */
if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
printk(KERN_ERR "Invalid chain id\n");
return -EINVAL;
}
/* Check if the chain exists */
if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
printk(KERN_ERR "Chain doesn't exists\n");
return -EINVAL;
}
channels = dma_linked_lch[chain_id].linked_dmach_q;
/* Get the current channel */
lch = channels[dma_linked_lch[chain_id].q_head];
return p->dma_read(CSAC, lch);
}
EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
#endif /* ifndef CONFIG_ARCH_OMAP1 */
/*----------------------------------------------------------------------------*/
#ifdef CONFIG_ARCH_OMAP1
static int omap1_dma_handle_ch(int ch)
{
u32 csr;
if (enable_1510_mode && ch >= 6) {
csr = dma_chan[ch].saved_csr;
dma_chan[ch].saved_csr = 0;
} else
csr = p->dma_read(CSR, ch);
if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
dma_chan[ch + 6].saved_csr = csr >> 7;
csr &= 0x7f;
}
if ((csr & 0x3f) == 0)
return 0;
if (unlikely(dma_chan[ch].dev_id == -1)) {
pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
ch, csr);
return 0;
}
if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
if (unlikely(csr & OMAP_DMA_DROP_IRQ))
pr_warn("DMA synchronization event drop occurred with device %d\n",
dma_chan[ch].dev_id);
if (likely(csr & OMAP_DMA_BLOCK_IRQ))
dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
if (likely(dma_chan[ch].callback != NULL))
dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
return 1;
}
static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
{
int ch = ((int) dev_id) - 1;
int handled = 0;
for (;;) {
int handled_now = 0;
handled_now += omap1_dma_handle_ch(ch);
if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
handled_now += omap1_dma_handle_ch(ch + 6);
if (!handled_now)
break;
handled += handled_now;
}
return handled ? IRQ_HANDLED : IRQ_NONE;
}
#else
#define omap1_dma_irq_handler NULL
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
static int omap2_dma_handle_ch(int ch)
{
u32 status = p->dma_read(CSR, ch);
if (!status) {
if (printk_ratelimit())
pr_warn("Spurious DMA IRQ for lch %d\n", ch);
p->dma_write(1 << ch, IRQSTATUS_L0, ch);
return 0;
}
if (unlikely(dma_chan[ch].dev_id == -1)) {
if (printk_ratelimit())
pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
status, ch);
return 0;
}
if (unlikely(status & OMAP_DMA_DROP_IRQ))
pr_info("DMA synchronization event drop occurred with device %d\n",
dma_chan[ch].dev_id);
if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
printk(KERN_INFO "DMA transaction error with device %d\n",
dma_chan[ch].dev_id);
if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
u32 ccr;
ccr = p->dma_read(CCR, ch);
ccr &= ~OMAP_DMA_CCR_EN;
p->dma_write(ccr, CCR, ch);
dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
}
}
if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
printk(KERN_INFO "DMA secure error with device %d\n",
dma_chan[ch].dev_id);
if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
printk(KERN_INFO "DMA misaligned error with device %d\n",
dma_chan[ch].dev_id);
p->dma_write(status, CSR, ch);
p->dma_write(1 << ch, IRQSTATUS_L0, ch);
/* read back the register to flush the write */
p->dma_read(IRQSTATUS_L0, ch);
/* If the ch is not chained then chain_id will be -1 */
if (dma_chan[ch].chain_id != -1) {
int chain_id = dma_chan[ch].chain_id;
dma_chan[ch].state = DMA_CH_NOTSTARTED;
if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
dma_chan[dma_chan[ch].next_linked_ch].state =
DMA_CH_STARTED;
if (dma_linked_lch[chain_id].chain_mode ==
OMAP_DMA_DYNAMIC_CHAIN)
disable_lnk(ch);
if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
OMAP_DMA_CHAIN_INCQHEAD(chain_id);
status = p->dma_read(CSR, ch);
p->dma_write(status, CSR, ch);
}
if (likely(dma_chan[ch].callback != NULL))
dma_chan[ch].callback(ch, status, dma_chan[ch].data);
return 0;
}
/* STATUS register count is from 1-32 while our is 0-31 */
static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
{
u32 val, enable_reg;
int i;
val = p->dma_read(IRQSTATUS_L0, 0);
if (val == 0) {
if (printk_ratelimit())
printk(KERN_WARNING "Spurious DMA IRQ\n");
return IRQ_HANDLED;
}
enable_reg = p->dma_read(IRQENABLE_L0, 0);
val &= enable_reg; /* Dispatch only relevant interrupts */
for (i = 0; i < dma_lch_count && val != 0; i++) {
if (val & 1)
omap2_dma_handle_ch(i);
val >>= 1;
}
return IRQ_HANDLED;
}
static struct irqaction omap24xx_dma_irq = {
.name = "DMA",
.handler = omap2_dma_irq_handler,
.flags = IRQF_DISABLED
};
#else
static struct irqaction omap24xx_dma_irq;
#endif
/*----------------------------------------------------------------------------*/
void omap_dma_global_context_save(void)
{
omap_dma_global_context.dma_irqenable_l0 =
p->dma_read(IRQENABLE_L0, 0);
omap_dma_global_context.dma_ocp_sysconfig =
p->dma_read(OCP_SYSCONFIG, 0);
omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
}
void omap_dma_global_context_restore(void)
{
int ch;
p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
OCP_SYSCONFIG, 0);
p->dma_write(omap_dma_global_context.dma_irqenable_l0,
IRQENABLE_L0, 0);
if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
p->dma_write(0x3 , IRQSTATUS_L0, 0);
for (ch = 0; ch < dma_chan_count; ch++)
if (dma_chan[ch].dev_id != -1)
omap_clear_dma(ch);
}
static int omap_system_dma_probe(struct platform_device *pdev)
{
int ch, ret = 0;
int dma_irq;
char irq_name[4];
int irq_rel;
p = pdev->dev.platform_data;
if (!p) {
dev_err(&pdev->dev,
"%s: System DMA initialized without platform data\n",
__func__);
return -EINVAL;
}
d = p->dma_attr;
errata = p->errata;
if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
&& (omap_dma_reserve_channels < d->lch_count))
d->lch_count = omap_dma_reserve_channels;
dma_lch_count = d->lch_count;
dma_chan_count = dma_lch_count;
dma_chan = d->chan;
enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
if (dma_omap2plus()) {
dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
dma_lch_count, GFP_KERNEL);
if (!dma_linked_lch) {
ret = -ENOMEM;
goto exit_dma_lch_fail;
}
}
spin_lock_init(&dma_chan_lock);
for (ch = 0; ch < dma_chan_count; ch++) {
omap_clear_dma(ch);
if (dma_omap2plus())
omap2_disable_irq_lch(ch);
dma_chan[ch].dev_id = -1;
dma_chan[ch].next_lch = -1;
if (ch >= 6 && enable_1510_mode)
continue;
if (dma_omap1()) {
/*
* request_irq() doesn't like dev_id (ie. ch) being
* zero, so we have to kludge around this.
*/
sprintf(&irq_name[0], "%d", ch);
dma_irq = platform_get_irq_byname(pdev, irq_name);
if (dma_irq < 0) {
ret = dma_irq;
goto exit_dma_irq_fail;
}
/* INT_DMA_LCD is handled in lcd_dma.c */
if (dma_irq == INT_DMA_LCD)
continue;
ret = request_irq(dma_irq,
omap1_dma_irq_handler, 0, "DMA",
(void *) (ch + 1));
if (ret != 0)
goto exit_dma_irq_fail;
}
}
if (d->dev_caps & IS_RW_PRIORITY)
omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
DMA_DEFAULT_FIFO_DEPTH, 0);
if (dma_omap2plus()) {
strcpy(irq_name, "0");
dma_irq = platform_get_irq_byname(pdev, irq_name);
if (dma_irq < 0) {
dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
goto exit_dma_lch_fail;
}
ret = setup_irq(dma_irq, &omap24xx_dma_irq);
if (ret) {
dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
dma_irq, ret);
goto exit_dma_lch_fail;
}
}
/* reserve dma channels 0 and 1 in high security devices on 34xx */
if (d->dev_caps & HS_CHANNELS_RESERVED) {
pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
dma_chan[0].dev_id = 0;
dma_chan[1].dev_id = 1;
}
p->show_dma_caps();
return 0;
exit_dma_irq_fail:
dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
dma_irq, ret);
for (irq_rel = 0; irq_rel < ch; irq_rel++) {
dma_irq = platform_get_irq(pdev, irq_rel);
free_irq(dma_irq, (void *)(irq_rel + 1));
}
exit_dma_lch_fail:
kfree(p);
kfree(d);
kfree(dma_chan);
return ret;
}
static int omap_system_dma_remove(struct platform_device *pdev)
{
int dma_irq;
if (dma_omap2plus()) {
char irq_name[4];
strcpy(irq_name, "0");
dma_irq = platform_get_irq_byname(pdev, irq_name);
remove_irq(dma_irq, &omap24xx_dma_irq);
} else {
int irq_rel = 0;
for ( ; irq_rel < dma_chan_count; irq_rel++) {
dma_irq = platform_get_irq(pdev, irq_rel);
free_irq(dma_irq, (void *)(irq_rel + 1));
}
}
kfree(p);
kfree(d);
kfree(dma_chan);
return 0;
}
static struct platform_driver omap_system_dma_driver = {
.probe = omap_system_dma_probe,
.remove = omap_system_dma_remove,
.driver = {
.name = "omap_dma_system"
},
};
static int __init omap_system_dma_init(void)
{
return platform_driver_register(&omap_system_dma_driver);
}
arch_initcall(omap_system_dma_init);
static void __exit omap_system_dma_exit(void)
{
platform_driver_unregister(&omap_system_dma_driver);
}
MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_AUTHOR("Texas Instruments Inc");
/*
* Reserve the omap SDMA channels using cmdline bootarg
* "omap_dma_reserve_ch=". The valid range is 1 to 32
*/
static int __init omap_dma_cmdline_reserve_ch(char *str)
{
if (get_option(&str, &omap_dma_reserve_channels) != 1)
omap_dma_reserve_channels = 0;
return 1;
}
__setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
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