Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-15 08:31:55 +00:00
Code Issues Packages Projects Releases Wiki Activity

ARM: tegra: dma: remove legacy APB DMA driver

Browse Source 
Remove the legacy APB dma driver. The APB DMA support
is moved to dmaengine based Tegra APB DMA driver.
All clients are also moved to dmaengine based APB DMA
driver.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Laxman Dewangan 2012-08-16 04:13:14 +00:00 committed by Stephen Warren
parent e2187b940f
commit b4c2696798
4 changed files with 0 additions and 928 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/mach-tegra/Kconfig
View File

@ -130,13 +130,6 @@ config TEGRA_DEBUG_UART_AUTO_SCRATCH
endchoice
config TEGRA_SYSTEM_DMA
bool "Enable system DMA driver for NVIDIA Tegra SoCs"
default y
help
Adds system DMA functionality for NVIDIA Tegra SoCs, used by
several Tegra device drivers
config TEGRA_EMC_SCALING_ENABLE
bool "Enable scaling the memory frequency"

1
arch/arm/mach-tegra/Makefile
View File

@ -18,7 +18,6 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30_clocks.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
obj-$(CONFIG_SMP) += reset.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
obj-$(CONFIG_TEGRA_SYSTEM_DMA) += dma.o
obj-$(CONFIG_CPU_FREQ) += cpu-tegra.o
obj-$(CONFIG_TEGRA_PCI) += pcie.o
obj-$(CONFIG_USB_SUPPORT) += usb_phy.o

823
arch/arm/mach-tegra/dma.c
View File

@ -1,823 +0,0 @@
/*
* arch/arm/mach-tegra/dma.c
*
* System DMA driver for NVIDIA Tegra SoCs
*
* Copyright (c) 2008-2009, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <mach/dma.h>
#include <mach/irqs.h>
#include <mach/iomap.h>
#include <mach/suspend.h>
#include "apbio.h"
#define APB_DMA_GEN 0x000
#define GEN_ENABLE (1<<31)
#define APB_DMA_CNTRL 0x010
#define APB_DMA_IRQ_MASK 0x01c
#define APB_DMA_IRQ_MASK_SET 0x020
#define APB_DMA_CHAN_CSR 0x000
#define CSR_ENB (1<<31)
#define CSR_IE_EOC (1<<30)
#define CSR_HOLD (1<<29)
#define CSR_DIR (1<<28)
#define CSR_ONCE (1<<27)
#define CSR_FLOW (1<<21)
#define CSR_REQ_SEL_SHIFT 16
#define CSR_WCOUNT_SHIFT 2
#define CSR_WCOUNT_MASK 0xFFFC
#define APB_DMA_CHAN_STA 0x004
#define STA_BUSY (1<<31)
#define STA_ISE_EOC (1<<30)
#define STA_HALT (1<<29)
#define STA_PING_PONG (1<<28)
#define STA_COUNT_SHIFT 2
#define STA_COUNT_MASK 0xFFFC
#define APB_DMA_CHAN_AHB_PTR 0x010
#define APB_DMA_CHAN_AHB_SEQ 0x014
#define AHB_SEQ_INTR_ENB (1<<31)
#define AHB_SEQ_BUS_WIDTH_SHIFT 28
#define AHB_SEQ_BUS_WIDTH_MASK (0x7<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_BUS_WIDTH_8 (0<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_BUS_WIDTH_16 (1<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_BUS_WIDTH_32 (2<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_BUS_WIDTH_64 (3<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_BUS_WIDTH_128 (4<<AHB_SEQ_BUS_WIDTH_SHIFT)
#define AHB_SEQ_DATA_SWAP (1<<27)
#define AHB_SEQ_BURST_MASK (0x7<<24)
#define AHB_SEQ_BURST_1 (4<<24)
#define AHB_SEQ_BURST_4 (5<<24)
#define AHB_SEQ_BURST_8 (6<<24)
#define AHB_SEQ_DBL_BUF (1<<19)
#define AHB_SEQ_WRAP_SHIFT 16
#define AHB_SEQ_WRAP_MASK (0x7<<AHB_SEQ_WRAP_SHIFT)
#define APB_DMA_CHAN_APB_PTR 0x018
#define APB_DMA_CHAN_APB_SEQ 0x01c
#define APB_SEQ_BUS_WIDTH_SHIFT 28
#define APB_SEQ_BUS_WIDTH_MASK (0x7<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_BUS_WIDTH_8 (0<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_BUS_WIDTH_16 (1<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_BUS_WIDTH_32 (2<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_BUS_WIDTH_64 (3<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_BUS_WIDTH_128 (4<<APB_SEQ_BUS_WIDTH_SHIFT)
#define APB_SEQ_DATA_SWAP (1<<27)
#define APB_SEQ_WRAP_SHIFT 16
#define APB_SEQ_WRAP_MASK (0x7<<APB_SEQ_WRAP_SHIFT)
#define TEGRA_SYSTEM_DMA_CH_NR 16
#define TEGRA_SYSTEM_DMA_AVP_CH_NUM 4
#define TEGRA_SYSTEM_DMA_CH_MIN 0
#define TEGRA_SYSTEM_DMA_CH_MAX \
(TEGRA_SYSTEM_DMA_CH_NR - TEGRA_SYSTEM_DMA_AVP_CH_NUM - 1)
#define NV_DMA_MAX_TRASFER_SIZE 0x10000
static const unsigned int ahb_addr_wrap_table[8] = {
0, 32, 64, 128, 256, 512, 1024, 2048
};
static const unsigned int apb_addr_wrap_table[8] = {
0, 1, 2, 4, 8, 16, 32, 64
};
static const unsigned int bus_width_table[5] = {
8, 16, 32, 64, 128
};
#define TEGRA_DMA_NAME_SIZE 16
struct tegra_dma_channel {
struct list_head list;
int id;
spinlock_t lock;
char name[TEGRA_DMA_NAME_SIZE];
void __iomem *addr;
int mode;
int irq;
int req_transfer_count;
};
#define NV_DMA_MAX_CHANNELS 32
static bool tegra_dma_initialized;
static DEFINE_MUTEX(tegra_dma_lock);
static DEFINE_SPINLOCK(enable_lock);
static DECLARE_BITMAP(channel_usage, NV_DMA_MAX_CHANNELS);
static struct tegra_dma_channel dma_channels[NV_DMA_MAX_CHANNELS];
static void tegra_dma_update_hw(struct tegra_dma_channel *ch,
struct tegra_dma_req *req);
static void tegra_dma_update_hw_partial(struct tegra_dma_channel *ch,
struct tegra_dma_req *req);
static void tegra_dma_stop(struct tegra_dma_channel *ch);
void tegra_dma_flush(struct tegra_dma_channel *ch)
{
}
EXPORT_SYMBOL(tegra_dma_flush);
void tegra_dma_dequeue(struct tegra_dma_channel *ch)
{
struct tegra_dma_req *req;
if (tegra_dma_is_empty(ch))
return;
req = list_entry(ch->list.next, typeof(*req), node);
tegra_dma_dequeue_req(ch, req);
return;
}
static void tegra_dma_stop(struct tegra_dma_channel *ch)
{
u32 csr;
u32 status;
csr = readl(ch->addr + APB_DMA_CHAN_CSR);
csr &= ~CSR_IE_EOC;
writel(csr, ch->addr + APB_DMA_CHAN_CSR);
csr &= ~CSR_ENB;
writel(csr, ch->addr + APB_DMA_CHAN_CSR);
status = readl(ch->addr + APB_DMA_CHAN_STA);
if (status & STA_ISE_EOC)
writel(status, ch->addr + APB_DMA_CHAN_STA);
}
static int tegra_dma_cancel(struct tegra_dma_channel *ch)
{
unsigned long irq_flags;
spin_lock_irqsave(&ch->lock, irq_flags);
while (!list_empty(&ch->list))
list_del(ch->list.next);
tegra_dma_stop(ch);
spin_unlock_irqrestore(&ch->lock, irq_flags);
return 0;
}
static unsigned int get_channel_status(struct tegra_dma_channel *ch,
struct tegra_dma_req *req, bool is_stop_dma)
{
void __iomem *addr = IO_ADDRESS(TEGRA_APB_DMA_BASE);
unsigned int status;
if (is_stop_dma) {
/*
* STOP the DMA and get the transfer count.
* Getting the transfer count is tricky.
* - Globally disable DMA on all channels
* - Read the channel's status register to know the number
* of pending bytes to be transfered.
* - Stop the dma channel
* - Globally re-enable DMA to resume other transfers
*/
spin_lock(&enable_lock);
writel(0, addr + APB_DMA_GEN);
udelay(20);
status = readl(ch->addr + APB_DMA_CHAN_STA);
tegra_dma_stop(ch);
writel(GEN_ENABLE, addr + APB_DMA_GEN);
spin_unlock(&enable_lock);
if (status & STA_ISE_EOC) {
pr_err("Got Dma Int here clearing");
writel(status, ch->addr + APB_DMA_CHAN_STA);
}
req->status = TEGRA_DMA_REQ_ERROR_ABORTED;
} else {
status = readl(ch->addr + APB_DMA_CHAN_STA);
}
return status;
}
/* should be called with the channel lock held */
static unsigned int dma_active_count(struct tegra_dma_channel *ch,
struct tegra_dma_req *req, unsigned int status)
{
unsigned int to_transfer;
unsigned int req_transfer_count;
unsigned int bytes_transferred;
to_transfer = ((status & STA_COUNT_MASK) >> STA_COUNT_SHIFT) + 1;
req_transfer_count = ch->req_transfer_count + 1;
bytes_transferred = req_transfer_count;
if (status & STA_BUSY)
bytes_transferred -= to_transfer;
/*
* In continuous transfer mode, DMA only tracks the count of the
* half DMA buffer. So, if the DMA already finished half the DMA
* then add the half buffer to the completed count.
*/
if (ch->mode & TEGRA_DMA_MODE_CONTINOUS) {
if (req->buffer_status == TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL)
bytes_transferred += req_transfer_count;
if (status & STA_ISE_EOC)
bytes_transferred += req_transfer_count;
}
bytes_transferred *= 4;
return bytes_transferred;
}
int tegra_dma_dequeue_req(struct tegra_dma_channel *ch,
struct tegra_dma_req *_req)
{
unsigned int status;
struct tegra_dma_req *req = NULL;
int found = 0;
unsigned long irq_flags;
int stop = 0;
spin_lock_irqsave(&ch->lock, irq_flags);
if (list_entry(ch->list.next, struct tegra_dma_req, node) == _req)
stop = 1;
list_for_each_entry(req, &ch->list, node) {
if (req == _req) {
list_del(&req->node);
found = 1;
break;
}
}
if (!found) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return 0;
}
if (!stop)
goto skip_stop_dma;
status = get_channel_status(ch, req, true);
req->bytes_transferred = dma_active_count(ch, req, status);
if (!list_empty(&ch->list)) {
/* if the list is not empty, queue the next request */
struct tegra_dma_req *next_req;
next_req = list_entry(ch->list.next,
typeof(*next_req), node);
tegra_dma_update_hw(ch, next_req);
}
skip_stop_dma:
req->status = -TEGRA_DMA_REQ_ERROR_ABORTED;
spin_unlock_irqrestore(&ch->lock, irq_flags);
/* Callback should be called without any lock */
req->complete(req);
return 0;
}
EXPORT_SYMBOL(tegra_dma_dequeue_req);
bool tegra_dma_is_empty(struct tegra_dma_channel *ch)
{
unsigned long irq_flags;
bool is_empty;
spin_lock_irqsave(&ch->lock, irq_flags);
if (list_empty(&ch->list))
is_empty = true;
else
is_empty = false;
spin_unlock_irqrestore(&ch->lock, irq_flags);
return is_empty;
}
EXPORT_SYMBOL(tegra_dma_is_empty);
bool tegra_dma_is_req_inflight(struct tegra_dma_channel *ch,
struct tegra_dma_req *_req)
{
unsigned long irq_flags;
struct tegra_dma_req *req;
spin_lock_irqsave(&ch->lock, irq_flags);
list_for_each_entry(req, &ch->list, node) {
if (req == _req) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return true;
}
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
return false;
}
EXPORT_SYMBOL(tegra_dma_is_req_inflight);
int tegra_dma_enqueue_req(struct tegra_dma_channel *ch,
struct tegra_dma_req *req)
{
unsigned long irq_flags;
struct tegra_dma_req *_req;
int start_dma = 0;
if (req->size > NV_DMA_MAX_TRASFER_SIZE ||
req->source_addr & 0x3 || req->dest_addr & 0x3) {
pr_err("Invalid DMA request for channel %d\n", ch->id);
return -EINVAL;
}
spin_lock_irqsave(&ch->lock, irq_flags);
list_for_each_entry(_req, &ch->list, node) {
if (req == _req) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return -EEXIST;
}
}
req->bytes_transferred = 0;
req->status = 0;
req->buffer_status = 0;
if (list_empty(&ch->list))
start_dma = 1;
list_add_tail(&req->node, &ch->list);
if (start_dma)
tegra_dma_update_hw(ch, req);
spin_unlock_irqrestore(&ch->lock, irq_flags);
return 0;
}
EXPORT_SYMBOL(tegra_dma_enqueue_req);
struct tegra_dma_channel *tegra_dma_allocate_channel(int mode)
{
int channel;
struct tegra_dma_channel *ch = NULL;
if (!tegra_dma_initialized)
return NULL;
mutex_lock(&tegra_dma_lock);
/* first channel is the shared channel */
if (mode & TEGRA_DMA_SHARED) {
channel = TEGRA_SYSTEM_DMA_CH_MIN;
} else {
channel = find_first_zero_bit(channel_usage,
ARRAY_SIZE(dma_channels));
if (channel >= ARRAY_SIZE(dma_channels))
goto out;
}
__set_bit(channel, channel_usage);
ch = &dma_channels[channel];
ch->mode = mode;
out:
mutex_unlock(&tegra_dma_lock);
return ch;
}
EXPORT_SYMBOL(tegra_dma_allocate_channel);
void tegra_dma_free_channel(struct tegra_dma_channel *ch)
{
if (ch->mode & TEGRA_DMA_SHARED)
return;
tegra_dma_cancel(ch);
mutex_lock(&tegra_dma_lock);
__clear_bit(ch->id, channel_usage);
mutex_unlock(&tegra_dma_lock);
}
EXPORT_SYMBOL(tegra_dma_free_channel);
static void tegra_dma_update_hw_partial(struct tegra_dma_channel *ch,
struct tegra_dma_req *req)
{
u32 apb_ptr;
u32 ahb_ptr;
if (req->to_memory) {
apb_ptr = req->source_addr;
ahb_ptr = req->dest_addr;
} else {
apb_ptr = req->dest_addr;
ahb_ptr = req->source_addr;
}
writel(apb_ptr, ch->addr + APB_DMA_CHAN_APB_PTR);
writel(ahb_ptr, ch->addr + APB_DMA_CHAN_AHB_PTR);
req->status = TEGRA_DMA_REQ_INFLIGHT;
return;
}
static void tegra_dma_update_hw(struct tegra_dma_channel *ch,
struct tegra_dma_req *req)
{
int ahb_addr_wrap;
int apb_addr_wrap;
int ahb_bus_width;
int apb_bus_width;
int index;
u32 ahb_seq;
u32 apb_seq;
u32 ahb_ptr;
u32 apb_ptr;
u32 csr;
csr = CSR_IE_EOC | CSR_FLOW;
ahb_seq = AHB_SEQ_INTR_ENB | AHB_SEQ_BURST_1;
apb_seq = 0;
csr |= req->req_sel << CSR_REQ_SEL_SHIFT;
/* One shot mode is always single buffered,
* continuous mode is always double buffered
* */
if (ch->mode & TEGRA_DMA_MODE_ONESHOT) {
csr |= CSR_ONCE;
ch->req_transfer_count = (req->size >> 2) - 1;
} else {
ahb_seq |= AHB_SEQ_DBL_BUF;
/* In double buffered mode, we set the size to half the
* requested size and interrupt when half the buffer
* is full */
ch->req_transfer_count = (req->size >> 3) - 1;
}
csr |= ch->req_transfer_count << CSR_WCOUNT_SHIFT;
if (req->to_memory) {
apb_ptr = req->source_addr;
ahb_ptr = req->dest_addr;
apb_addr_wrap = req->source_wrap;
ahb_addr_wrap = req->dest_wrap;
apb_bus_width = req->source_bus_width;
ahb_bus_width = req->dest_bus_width;
} else {
csr |= CSR_DIR;
apb_ptr = req->dest_addr;
ahb_ptr = req->source_addr;
apb_addr_wrap = req->dest_wrap;
ahb_addr_wrap = req->source_wrap;
apb_bus_width = req->dest_bus_width;
ahb_bus_width = req->source_bus_width;
}
apb_addr_wrap >>= 2;
ahb_addr_wrap >>= 2;
/* set address wrap for APB size */
index = 0;
do {
if (apb_addr_wrap_table[index] == apb_addr_wrap)
break;
index++;
} while (index < ARRAY_SIZE(apb_addr_wrap_table));
BUG_ON(index == ARRAY_SIZE(apb_addr_wrap_table));
apb_seq |= index << APB_SEQ_WRAP_SHIFT;
/* set address wrap for AHB size */
index = 0;
do {
if (ahb_addr_wrap_table[index] == ahb_addr_wrap)
break;
index++;
} while (index < ARRAY_SIZE(ahb_addr_wrap_table));
BUG_ON(index == ARRAY_SIZE(ahb_addr_wrap_table));
ahb_seq |= index << AHB_SEQ_WRAP_SHIFT;
for (index = 0; index < ARRAY_SIZE(bus_width_table); index++) {
if (bus_width_table[index] == ahb_bus_width)
break;
}
BUG_ON(index == ARRAY_SIZE(bus_width_table));
ahb_seq |= index << AHB_SEQ_BUS_WIDTH_SHIFT;
for (index = 0; index < ARRAY_SIZE(bus_width_table); index++) {
if (bus_width_table[index] == apb_bus_width)
break;
}
BUG_ON(index == ARRAY_SIZE(bus_width_table));
apb_seq |= index << APB_SEQ_BUS_WIDTH_SHIFT;
writel(csr, ch->addr + APB_DMA_CHAN_CSR);
writel(apb_seq, ch->addr + APB_DMA_CHAN_APB_SEQ);
writel(apb_ptr, ch->addr + APB_DMA_CHAN_APB_PTR);
writel(ahb_seq, ch->addr + APB_DMA_CHAN_AHB_SEQ);
writel(ahb_ptr, ch->addr + APB_DMA_CHAN_AHB_PTR);
csr |= CSR_ENB;
writel(csr, ch->addr + APB_DMA_CHAN_CSR);
req->status = TEGRA_DMA_REQ_INFLIGHT;
}
static void handle_oneshot_dma(struct tegra_dma_channel *ch)
{
struct tegra_dma_req *req;
unsigned long irq_flags;
spin_lock_irqsave(&ch->lock, irq_flags);
if (list_empty(&ch->list)) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
}
req = list_entry(ch->list.next, typeof(*req), node);
if (req) {
int bytes_transferred;
bytes_transferred = ch->req_transfer_count;
bytes_transferred += 1;
bytes_transferred <<= 2;
list_del(&req->node);
req->bytes_transferred = bytes_transferred;
req->status = TEGRA_DMA_REQ_SUCCESS;
spin_unlock_irqrestore(&ch->lock, irq_flags);
/* Callback should be called without any lock */
pr_debug("%s: transferred %d bytes\n", __func__,
req->bytes_transferred);
req->complete(req);
spin_lock_irqsave(&ch->lock, irq_flags);
}
if (!list_empty(&ch->list)) {
req = list_entry(ch->list.next, typeof(*req), node);
/* the complete function we just called may have enqueued
another req, in which case dma has already started */
if (req->status != TEGRA_DMA_REQ_INFLIGHT)
tegra_dma_update_hw(ch, req);
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
}
static void handle_continuous_dma(struct tegra_dma_channel *ch)
{
struct tegra_dma_req *req;
unsigned long irq_flags;
spin_lock_irqsave(&ch->lock, irq_flags);
if (list_empty(&ch->list)) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
}
req = list_entry(ch->list.next, typeof(*req), node);
if (req) {
if (req->buffer_status == TEGRA_DMA_REQ_BUF_STATUS_EMPTY) {
bool is_dma_ping_complete;
is_dma_ping_complete = (readl(ch->addr + APB_DMA_CHAN_STA)
& STA_PING_PONG) ? true : false;
if (req->to_memory)
is_dma_ping_complete = !is_dma_ping_complete;
/* Out of sync - Release current buffer */
if (!is_dma_ping_complete) {
int bytes_transferred;
bytes_transferred = ch->req_transfer_count;
bytes_transferred += 1;
bytes_transferred <<= 3;
req->buffer_status = TEGRA_DMA_REQ_BUF_STATUS_FULL;
req->bytes_transferred = bytes_transferred;
req->status = TEGRA_DMA_REQ_SUCCESS;
tegra_dma_stop(ch);
if (!list_is_last(&req->node, &ch->list)) {
struct tegra_dma_req *next_req;
next_req = list_entry(req->node.next,
typeof(*next_req), node);
tegra_dma_update_hw(ch, next_req);
}
list_del(&req->node);
/* DMA lock is NOT held when callbak is called */
spin_unlock_irqrestore(&ch->lock, irq_flags);
req->complete(req);
return;
}
/* Load the next request into the hardware, if available
* */
if (!list_is_last(&req->node, &ch->list)) {
struct tegra_dma_req *next_req;
next_req = list_entry(req->node.next,
typeof(*next_req), node);
tegra_dma_update_hw_partial(ch, next_req);
}
req->buffer_status = TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL;
req->status = TEGRA_DMA_REQ_SUCCESS;
/* DMA lock is NOT held when callback is called */
spin_unlock_irqrestore(&ch->lock, irq_flags);
if (likely(req->threshold))
req->threshold(req);
return;
} else if (req->buffer_status ==
TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL) {
/* Callback when the buffer is completely full (i.e on
* the second interrupt */
int bytes_transferred;
bytes_transferred = ch->req_transfer_count;
bytes_transferred += 1;
bytes_transferred <<= 3;
req->buffer_status = TEGRA_DMA_REQ_BUF_STATUS_FULL;
req->bytes_transferred = bytes_transferred;
req->status = TEGRA_DMA_REQ_SUCCESS;
list_del(&req->node);
/* DMA lock is NOT held when callbak is called */
spin_unlock_irqrestore(&ch->lock, irq_flags);
req->complete(req);
return;
} else {
BUG();
}
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
}
static irqreturn_t dma_isr(int irq, void *data)
{
struct tegra_dma_channel *ch = data;
unsigned long status;
status = readl(ch->addr + APB_DMA_CHAN_STA);
if (status & STA_ISE_EOC)
writel(status, ch->addr + APB_DMA_CHAN_STA);
else {
pr_warning("Got a spurious ISR for DMA channel %d\n", ch->id);
return IRQ_HANDLED;
}
return IRQ_WAKE_THREAD;
}
static irqreturn_t dma_thread_fn(int irq, void *data)
{
struct tegra_dma_channel *ch = data;
if (ch->mode & TEGRA_DMA_MODE_ONESHOT)
handle_oneshot_dma(ch);
else
handle_continuous_dma(ch);
return IRQ_HANDLED;
}
int __init tegra_dma_init(void)
{
int ret = 0;
int i;
unsigned int irq;
void __iomem *addr;
struct clk *c;
bitmap_fill(channel_usage, NV_DMA_MAX_CHANNELS);
c = clk_get_sys("tegra-apbdma", NULL);
if (IS_ERR(c)) {
pr_err("Unable to get clock for APB DMA\n");
ret = PTR_ERR(c);
goto fail;
}
ret = clk_prepare_enable(c);
if (ret != 0) {
pr_err("Unable to enable clock for APB DMA\n");
goto fail;
}
addr = IO_ADDRESS(TEGRA_APB_DMA_BASE);
writel(GEN_ENABLE, addr + APB_DMA_GEN);
writel(0, addr + APB_DMA_CNTRL);
writel(0xFFFFFFFFul >> (31 - TEGRA_SYSTEM_DMA_CH_MAX),
addr + APB_DMA_IRQ_MASK_SET);
for (i = TEGRA_SYSTEM_DMA_CH_MIN; i <= TEGRA_SYSTEM_DMA_CH_MAX; i++) {
struct tegra_dma_channel *ch = &dma_channels[i];
ch->id = i;
snprintf(ch->name, TEGRA_DMA_NAME_SIZE, "dma_channel_%d", i);
ch->addr = IO_ADDRESS(TEGRA_APB_DMA_CH0_BASE +
TEGRA_APB_DMA_CH0_SIZE * i);
spin_lock_init(&ch->lock);
INIT_LIST_HEAD(&ch->list);
irq = INT_APB_DMA_CH0 + i;
ret = request_threaded_irq(irq, dma_isr, dma_thread_fn, 0,
dma_channels[i].name, ch);
if (ret) {
pr_err("Failed to register IRQ %d for DMA %d\n",
irq, i);
goto fail;
}
ch->irq = irq;
__clear_bit(i, channel_usage);
}
/* mark the shared channel allocated */
__set_bit(TEGRA_SYSTEM_DMA_CH_MIN, channel_usage);
tegra_dma_initialized = true;
return 0;
fail:
writel(0, addr + APB_DMA_GEN);
for (i = TEGRA_SYSTEM_DMA_CH_MIN; i <= TEGRA_SYSTEM_DMA_CH_MAX; i++) {
struct tegra_dma_channel *ch = &dma_channels[i];
if (ch->irq)
free_irq(ch->irq, ch);
}
return ret;
}
postcore_initcall(tegra_dma_init);
#ifdef CONFIG_PM
static u32 apb_dma[5*TEGRA_SYSTEM_DMA_CH_NR + 3];
void tegra_dma_suspend(void)
{
void __iomem *addr = IO_ADDRESS(TEGRA_APB_DMA_BASE);
u32 *ctx = apb_dma;
int i;
*ctx++ = readl(addr + APB_DMA_GEN);
*ctx++ = readl(addr + APB_DMA_CNTRL);
*ctx++ = readl(addr + APB_DMA_IRQ_MASK);
for (i = 0; i < TEGRA_SYSTEM_DMA_CH_NR; i++) {
addr = IO_ADDRESS(TEGRA_APB_DMA_CH0_BASE +
TEGRA_APB_DMA_CH0_SIZE * i);
*ctx++ = readl(addr + APB_DMA_CHAN_CSR);
*ctx++ = readl(addr + APB_DMA_CHAN_AHB_PTR);
*ctx++ = readl(addr + APB_DMA_CHAN_AHB_SEQ);
*ctx++ = readl(addr + APB_DMA_CHAN_APB_PTR);
*ctx++ = readl(addr + APB_DMA_CHAN_APB_SEQ);
}
}
void tegra_dma_resume(void)
{
void __iomem *addr = IO_ADDRESS(TEGRA_APB_DMA_BASE);
u32 *ctx = apb_dma;
int i;
writel(*ctx++, addr + APB_DMA_GEN);
writel(*ctx++, addr + APB_DMA_CNTRL);
writel(*ctx++, addr + APB_DMA_IRQ_MASK);
for (i = 0; i < TEGRA_SYSTEM_DMA_CH_NR; i++) {
addr = IO_ADDRESS(TEGRA_APB_DMA_CH0_BASE +
TEGRA_APB_DMA_CH0_SIZE * i);
writel(*ctx++, addr + APB_DMA_CHAN_CSR);
writel(*ctx++, addr + APB_DMA_CHAN_AHB_PTR);
writel(*ctx++, addr + APB_DMA_CHAN_AHB_SEQ);
writel(*ctx++, addr + APB_DMA_CHAN_APB_PTR);
writel(*ctx++, addr + APB_DMA_CHAN_APB_SEQ);
}
}
#endif

97
arch/arm/mach-tegra/include/mach/dma.h
View File

@ -51,101 +51,4 @@
#define TEGRA_DMA_REQ_SEL_OWR 25
#define TEGRA_DMA_REQ_SEL_INVALID 31
struct tegra_dma_req;
struct tegra_dma_channel;
enum tegra_dma_mode {
TEGRA_DMA_SHARED = 1,
TEGRA_DMA_MODE_CONTINOUS = 2,
TEGRA_DMA_MODE_ONESHOT = 4,
};
enum tegra_dma_req_error {
TEGRA_DMA_REQ_SUCCESS = 0,
TEGRA_DMA_REQ_ERROR_ABORTED,
TEGRA_DMA_REQ_INFLIGHT,
};
enum tegra_dma_req_buff_status {
TEGRA_DMA_REQ_BUF_STATUS_EMPTY = 0,
TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL,
TEGRA_DMA_REQ_BUF_STATUS_FULL,
};
struct tegra_dma_req {
struct list_head node;
unsigned int modid;
int instance;
/* Called when the req is complete and from the DMA ISR context.
* When this is called the req structure is no longer queued by
* the DMA channel.
*
* State of the DMA depends on the number of req it has. If there are
* no DMA requests queued up, then it will STOP the DMA. It there are
* more requests in the DMA, then it will queue the next request.
*/
void (*complete)(struct tegra_dma_req *req);
/* This is a called from the DMA ISR context when the DMA is still in
* progress and is actively filling same buffer.
*
* In case of continuous mode receive, this threshold is 1/2 the buffer
* size. In other cases, this will not even be called as there is no
* hardware support for it.
*
* In the case of continuous mode receive, if there is next req already
* queued, DMA programs the HW to use that req when this req is
* completed. If there is no "next req" queued, then DMA ISR doesn't do
* anything before calling this callback.
*
* This is mainly used by the cases, where the clients has queued
* only one req and want to get some sort of DMA threshold
* callback to program the next buffer.
*
*/
void (*threshold)(struct tegra_dma_req *req);
/* 1 to copy to memory.
* 0 to copy from the memory to device FIFO */
int to_memory;
void *virt_addr;
unsigned long source_addr;
unsigned long dest_addr;
unsigned long dest_wrap;
unsigned long source_wrap;
unsigned long source_bus_width;
unsigned long dest_bus_width;
unsigned long req_sel;
unsigned int size;
/* Updated by the DMA driver on the conpletion of the request. */
int bytes_transferred;
int status;
/* DMA completion tracking information */
int buffer_status;
/* Client specific data */
void *dev;
};
int tegra_dma_enqueue_req(struct tegra_dma_channel *ch,
struct tegra_dma_req *req);
int tegra_dma_dequeue_req(struct tegra_dma_channel *ch,
struct tegra_dma_req *req);
void tegra_dma_dequeue(struct tegra_dma_channel *ch);
void tegra_dma_flush(struct tegra_dma_channel *ch);
bool tegra_dma_is_req_inflight(struct tegra_dma_channel *ch,
struct tegra_dma_req *req);
bool tegra_dma_is_empty(struct tegra_dma_channel *ch);
struct tegra_dma_channel *tegra_dma_allocate_channel(int mode);
void tegra_dma_free_channel(struct tegra_dma_channel *ch);
int __init tegra_dma_init(void);
#endif