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Merge branch 'topic/qcom' into for-linus

hifive-unleashed-5.1
Vinod Koul 2016-05-17 10:15:13 +05:30
parent ba8b6cc072 42d236f8a4
commit 82770a2f65
9 changed files with 1302 additions and 43 deletions
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9
Documentation/ABI/testing/sysfs-platform-hidma 100644
View File

@ -0,0 +1,9 @@
What: /sys/devices/platform/hidma-*/chid
/sys/devices/platform/QCOM8061:*/chid
Date: Dec 2015
KernelVersion: 4.4
Contact: "Sinan Kaya <okaya@cudeaurora.org>"
Description:
Contains the ID of the channel within the HIDMA instance.
It is used to associate a given HIDMA channel with the
priority and weight calls in the management interface.

2
Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
View File

@ -13,6 +13,8 @@ Required properties:
- clock-names: must contain "bam_clk" entry
- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
the secure world.
- qcom,controlled-remotely : optional, indicates that the bam is controlled by
remote proccessor i.e. execution environment.
Example:

2
drivers/dma/qcom/Makefile
View File

@ -1,3 +1,5 @@
obj-$(CONFIG_QCOM_BAM_DMA) += bam_dma.o
obj-$(CONFIG_QCOM_HIDMA_MGMT) += hdma_mgmt.o
hdma_mgmt-objs := hidma_mgmt.o hidma_mgmt_sys.o
obj-$(CONFIG_QCOM_HIDMA) += hdma.o
hdma-objs := hidma_ll.o hidma.o hidma_dbg.o

38
drivers/dma/qcom/bam_dma.c
View File

@ -342,7 +342,7 @@ static const struct reg_offset_data bam_v1_7_reg_info[] = {
#define BAM_DESC_FIFO_SIZE SZ_32K
#define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1)
#define BAM_MAX_DATA_SIZE (SZ_32K - 8)
#define BAM_FIFO_SIZE (SZ_32K - 8)
struct bam_chan {
struct virt_dma_chan vc;
@ -387,6 +387,7 @@ struct bam_device {
/* execution environment ID, from DT */
u32 ee;
bool controlled_remotely;
const struct reg_offset_data *layout;
@ -458,7 +459,7 @@ static void bam_chan_init_hw(struct bam_chan *bchan,
*/
writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)),
bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR));
writel_relaxed(BAM_DESC_FIFO_SIZE,
writel_relaxed(BAM_FIFO_SIZE,
bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES));
/* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */
@ -604,7 +605,7 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
/* calculate number of required entries */
for_each_sg(sgl, sg, sg_len, i)
num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_MAX_DATA_SIZE);
num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
/* allocate enough room to accomodate the number of entries */
async_desc = kzalloc(sizeof(*async_desc) +
@ -635,10 +636,10 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
desc->addr = cpu_to_le32(sg_dma_address(sg) +
curr_offset);
if (remainder > BAM_MAX_DATA_SIZE) {
desc->size = cpu_to_le16(BAM_MAX_DATA_SIZE);
remainder -= BAM_MAX_DATA_SIZE;
curr_offset += BAM_MAX_DATA_SIZE;
if (remainder > BAM_FIFO_SIZE) {
desc->size = cpu_to_le16(BAM_FIFO_SIZE);
remainder -= BAM_FIFO_SIZE;
curr_offset += BAM_FIFO_SIZE;
} else {
desc->size = cpu_to_le16(remainder);
remainder = 0;
@ -801,13 +802,17 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
if (srcs & P_IRQ)
tasklet_schedule(&bdev->task);
if (srcs & BAM_IRQ)
if (srcs & BAM_IRQ) {
clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
/* don't allow reorder of the various accesses to the BAM registers */
mb();
/*
* don't allow reorder of the various accesses to the BAM
* registers
*/
mb();
writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
}
return IRQ_HANDLED;
}
@ -1038,6 +1043,9 @@ static int bam_init(struct bam_device *bdev)
val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES));
bdev->num_channels = val & BAM_NUM_PIPES_MASK;
if (bdev->controlled_remotely)
return 0;
/* s/w reset bam */
/* after reset all pipes are disabled and idle */
val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
@ -1125,6 +1133,9 @@ static int bam_dma_probe(struct platform_device *pdev)
return ret;
}
bdev->controlled_remotely = of_property_read_bool(pdev->dev.of_node,
"qcom,controlled-remotely");
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
if (IS_ERR(bdev->bamclk))
return PTR_ERR(bdev->bamclk);
@ -1163,7 +1174,7 @@ static int bam_dma_probe(struct platform_device *pdev)
/* set max dma segment size */
bdev->common.dev = bdev->dev;
bdev->common.dev->dma_parms = &bdev->dma_parms;
ret = dma_set_max_seg_size(bdev->common.dev, BAM_MAX_DATA_SIZE);
ret = dma_set_max_seg_size(bdev->common.dev, BAM_FIFO_SIZE);
if (ret) {
dev_err(bdev->dev, "cannot set maximum segment size\n");
goto err_bam_channel_exit;
@ -1234,6 +1245,9 @@ static int bam_dma_remove(struct platform_device *pdev)
bam_dma_terminate_all(&bdev->channels[i].vc.chan);
tasklet_kill(&bdev->channels[i].vc.task);
if (!bdev->channels[i].fifo_virt)
continue;
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
bdev->channels[i].fifo_virt,
bdev->channels[i].fifo_phys);

52
drivers/dma/qcom/hidma.c
View File

@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine interface
*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -404,7 +404,7 @@ static int hidma_terminate_channel(struct dma_chan *chan)
spin_unlock_irqrestore(&mchan->lock, irqflags);
/* this suspends the existing transfer */
rc = hidma_ll_pause(dmadev->lldev);
rc = hidma_ll_disable(dmadev->lldev);
if (rc) {
dev_err(dmadev->ddev.dev, "channel did not pause\n");
goto out;
@ -427,7 +427,7 @@ static int hidma_terminate_channel(struct dma_chan *chan)
list_move(&mdesc->node, &mchan->free);
}
rc = hidma_ll_resume(dmadev->lldev);
rc = hidma_ll_enable(dmadev->lldev);
out:
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
@ -488,7 +488,7 @@ static int hidma_pause(struct dma_chan *chan)
dmadev = to_hidma_dev(mchan->chan.device);
if (!mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
if (hidma_ll_pause(dmadev->lldev))
if (hidma_ll_disable(dmadev->lldev))
dev_warn(dmadev->ddev.dev, "channel did not stop\n");
mchan->paused = true;
pm_runtime_mark_last_busy(dmadev->ddev.dev);
@ -507,7 +507,7 @@ static int hidma_resume(struct dma_chan *chan)
dmadev = to_hidma_dev(mchan->chan.device);
if (mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
rc = hidma_ll_resume(dmadev->lldev);
rc = hidma_ll_enable(dmadev->lldev);
if (!rc)
mchan->paused = false;
else
@ -530,6 +530,43 @@ static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
return hidma_ll_inthandler(chirq, lldev);
}
static ssize_t hidma_show_values(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
struct hidma_dev *mdev = platform_get_drvdata(pdev);
buf[0] = 0;
if (strcmp(attr->attr.name, "chid") == 0)
sprintf(buf, "%d\n", mdev->chidx);
return strlen(buf);
}
static int hidma_create_sysfs_entry(struct hidma_dev *dev, char *name,
int mode)
{
struct device_attribute *attrs;
char *name_copy;
attrs = devm_kmalloc(dev->ddev.dev, sizeof(struct device_attribute),
GFP_KERNEL);
if (!attrs)
return -ENOMEM;
name_copy = devm_kstrdup(dev->ddev.dev, name, GFP_KERNEL);
if (!name_copy)
return -ENOMEM;
attrs->attr.name = name_copy;
attrs->attr.mode = mode;
attrs->show = hidma_show_values;
sysfs_attr_init(&attrs->attr);
return device_create_file(dev->ddev.dev, attrs);
}
static int hidma_probe(struct platform_device *pdev)
{
struct hidma_dev *dmadev;
@ -644,6 +681,8 @@ static int hidma_probe(struct platform_device *pdev)
dmadev->irq = chirq;
tasklet_init(&dmadev->task, hidma_issue_task, (unsigned long)dmadev);
hidma_debug_init(dmadev);
hidma_create_sysfs_entry(dmadev, "chid", S_IRUGO);
dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
platform_set_drvdata(pdev, dmadev);
pm_runtime_mark_last_busy(dmadev->ddev.dev);
@ -651,6 +690,7 @@ static int hidma_probe(struct platform_device *pdev)
return 0;
uninit:
hidma_debug_uninit(dmadev);
hidma_ll_uninit(dmadev->lldev);
dmafree:
if (dmadev)
@ -668,6 +708,7 @@ static int hidma_remove(struct platform_device *pdev)
pm_runtime_get_sync(dmadev->ddev.dev);
dma_async_device_unregister(&dmadev->ddev);
devm_free_irq(dmadev->ddev.dev, dmadev->irq, dmadev->lldev);
hidma_debug_uninit(dmadev);
hidma_ll_uninit(dmadev->lldev);
hidma_free(dmadev);
@ -689,7 +730,6 @@ static const struct of_device_id hidma_match[] = {
{.compatible = "qcom,hidma-1.0",},
{},
};
MODULE_DEVICE_TABLE(of, hidma_match);
static struct platform_driver hidma_driver = {

40
drivers/dma/qcom/hidma.h
View File

@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA data structures
*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -20,32 +20,29 @@
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#define TRE_SIZE 32 /* each TRE is 32 bytes */
#define TRE_CFG_IDX 0
#define TRE_LEN_IDX 1
#define TRE_SRC_LOW_IDX 2
#define TRE_SRC_HI_IDX 3
#define TRE_DEST_LOW_IDX 4
#define TRE_DEST_HI_IDX 5
struct hidma_tx_status {
u8 err_info; /* error record in this transfer */
u8 err_code; /* completion code */
};
#define HIDMA_TRE_SIZE 32 /* each TRE is 32 bytes */
#define HIDMA_TRE_CFG_IDX 0
#define HIDMA_TRE_LEN_IDX 1
#define HIDMA_TRE_SRC_LOW_IDX 2
#define HIDMA_TRE_SRC_HI_IDX 3
#define HIDMA_TRE_DEST_LOW_IDX 4
#define HIDMA_TRE_DEST_HI_IDX 5
struct hidma_tre {
atomic_t allocated; /* if this channel is allocated */
bool queued; /* flag whether this is pending */
u16 status; /* status */
u32 chidx; /* index of the tre */
u32 idx; /* index of the tre */
u32 dma_sig; /* signature of the tre */
const char *dev_name; /* name of the device */
void (*callback)(void *data); /* requester callback */
void *data; /* Data associated with this channel*/
struct hidma_lldev *lldev; /* lldma device pointer */
u32 tre_local[TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
u32 tre_local[HIDMA_TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
u32 tre_index; /* the offset where this was written*/
u32 int_flags; /* interrupt flags */
u8 err_info; /* error record in this transfer */
u8 err_code; /* completion code */
};
struct hidma_lldev {
@ -61,22 +58,21 @@ struct hidma_lldev {
void __iomem *evca; /* Event Channel address */
struct hidma_tre
**pending_tre_list; /* Pointers to pending TREs */
struct hidma_tx_status
*tx_status_list; /* Pointers to pending TREs status*/
s32 pending_tre_count; /* Number of TREs pending */
void *tre_ring; /* TRE ring */
dma_addr_t tre_ring_handle; /* TRE ring to be shared with HW */
dma_addr_t tre_dma; /* TRE ring to be shared with HW */
u32 tre_ring_size; /* Byte size of the ring */
u32 tre_processed_off; /* last processed TRE */
void *evre_ring; /* EVRE ring */
dma_addr_t evre_ring_handle; /* EVRE ring to be shared with HW */
dma_addr_t evre_dma; /* EVRE ring to be shared with HW */
u32 evre_ring_size; /* Byte size of the ring */
u32 evre_processed_off; /* last processed EVRE */
u32 tre_write_offset; /* TRE write location */
struct tasklet_struct task; /* task delivering notifications */
struct tasklet_struct rst_task; /* task to reset HW */
DECLARE_KFIFO_PTR(handoff_fifo,
struct hidma_tre *); /* pending TREs FIFO */
};
@ -145,8 +141,8 @@ enum dma_status hidma_ll_status(struct hidma_lldev *llhndl, u32 tre_ch);
bool hidma_ll_isenabled(struct hidma_lldev *llhndl);
void hidma_ll_queue_request(struct hidma_lldev *llhndl, u32 tre_ch);
void hidma_ll_start(struct hidma_lldev *llhndl);
int hidma_ll_pause(struct hidma_lldev *llhndl);
int hidma_ll_resume(struct hidma_lldev *llhndl);
int hidma_ll_disable(struct hidma_lldev *lldev);
int hidma_ll_enable(struct hidma_lldev *llhndl);
void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
int hidma_ll_setup(struct hidma_lldev *lldev);
@ -157,4 +153,6 @@ int hidma_ll_uninit(struct hidma_lldev *llhndl);
irqreturn_t hidma_ll_inthandler(int irq, void *arg);
void hidma_cleanup_pending_tre(struct hidma_lldev *llhndl, u8 err_info,
u8 err_code);
int hidma_debug_init(struct hidma_dev *dmadev);
void hidma_debug_uninit(struct hidma_dev *dmadev);
#endif

217
drivers/dma/qcom/hidma_dbg.c 100644
View File

@ -0,0 +1,217 @@
/*
* Qualcomm Technologies HIDMA debug file
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/pm_runtime.h>
#include "hidma.h"
static void hidma_ll_chstats(struct seq_file *s, void *llhndl, u32 tre_ch)
{
struct hidma_lldev *lldev = llhndl;
struct hidma_tre *tre;
u32 length;
dma_addr_t src_start;
dma_addr_t dest_start;
u32 *tre_local;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in chstats:%d", tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
seq_printf(s, "------Channel %d -----\n", tre_ch);
seq_printf(s, "allocated=%d\n", atomic_read(&tre->allocated));
seq_printf(s, "queued = 0x%x\n", tre->queued);
seq_printf(s, "err_info = 0x%x\n", tre->err_info);
seq_printf(s, "err_code = 0x%x\n", tre->err_code);
seq_printf(s, "status = 0x%x\n", tre->status);
seq_printf(s, "idx = 0x%x\n", tre->idx);
seq_printf(s, "dma_sig = 0x%x\n", tre->dma_sig);
seq_printf(s, "dev_name=%s\n", tre->dev_name);
seq_printf(s, "callback=%p\n", tre->callback);
seq_printf(s, "data=%p\n", tre->data);
seq_printf(s, "tre_index = 0x%x\n", tre->tre_index);
tre_local = &tre->tre_local[0];
src_start = tre_local[HIDMA_TRE_SRC_LOW_IDX];
src_start = ((u64) (tre_local[HIDMA_TRE_SRC_HI_IDX]) << 32) + src_start;
dest_start = tre_local[HIDMA_TRE_DEST_LOW_IDX];
dest_start += ((u64) (tre_local[HIDMA_TRE_DEST_HI_IDX]) << 32);
length = tre_local[HIDMA_TRE_LEN_IDX];
seq_printf(s, "src=%pap\n", &src_start);
seq_printf(s, "dest=%pap\n", &dest_start);
seq_printf(s, "length = 0x%x\n", length);
}
static void hidma_ll_devstats(struct seq_file *s, void *llhndl)
{
struct hidma_lldev *lldev = llhndl;
seq_puts(s, "------Device -----\n");
seq_printf(s, "lldev init = 0x%x\n", lldev->initialized);
seq_printf(s, "trch_state = 0x%x\n", lldev->trch_state);
seq_printf(s, "evch_state = 0x%x\n", lldev->evch_state);
seq_printf(s, "chidx = 0x%x\n", lldev->chidx);
seq_printf(s, "nr_tres = 0x%x\n", lldev->nr_tres);
seq_printf(s, "trca=%p\n", lldev->trca);
seq_printf(s, "tre_ring=%p\n", lldev->tre_ring);
seq_printf(s, "tre_ring_handle=%pap\n", &lldev->tre_dma);
seq_printf(s, "tre_ring_size = 0x%x\n", lldev->tre_ring_size);
seq_printf(s, "tre_processed_off = 0x%x\n", lldev->tre_processed_off);
seq_printf(s, "pending_tre_count=%d\n", lldev->pending_tre_count);
seq_printf(s, "evca=%p\n", lldev->evca);
seq_printf(s, "evre_ring=%p\n", lldev->evre_ring);
seq_printf(s, "evre_ring_handle=%pap\n", &lldev->evre_dma);
seq_printf(s, "evre_ring_size = 0x%x\n", lldev->evre_ring_size);
seq_printf(s, "evre_processed_off = 0x%x\n", lldev->evre_processed_off);
seq_printf(s, "tre_write_offset = 0x%x\n", lldev->tre_write_offset);
}
/*
* hidma_chan_stats: display HIDMA channel statistics
*
* Display the statistics for the current HIDMA virtual channel device.
*/
static int hidma_chan_stats(struct seq_file *s, void *unused)
{
struct hidma_chan *mchan = s->private;
struct hidma_desc *mdesc;
struct hidma_dev *dmadev = mchan->dmadev;
pm_runtime_get_sync(dmadev->ddev.dev);
seq_printf(s, "paused=%u\n", mchan->paused);
seq_printf(s, "dma_sig=%u\n", mchan->dma_sig);
seq_puts(s, "prepared\n");
list_for_each_entry(mdesc, &mchan->prepared, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
seq_puts(s, "active\n");
list_for_each_entry(mdesc, &mchan->active, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
seq_puts(s, "completed\n");
list_for_each_entry(mdesc, &mchan->completed, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
hidma_ll_devstats(s, mchan->dmadev->lldev);
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return 0;
}
/*
* hidma_dma_info: display HIDMA device info
*
* Display the info for the current HIDMA device.
*/
static int hidma_dma_info(struct seq_file *s, void *unused)
{
struct hidma_dev *dmadev = s->private;
resource_size_t sz;
seq_printf(s, "nr_descriptors=%d\n", dmadev->nr_descriptors);
seq_printf(s, "dev_trca=%p\n", &dmadev->dev_trca);
seq_printf(s, "dev_trca_phys=%pa\n", &dmadev->trca_resource->start);
sz = resource_size(dmadev->trca_resource);
seq_printf(s, "dev_trca_size=%pa\n", &sz);
seq_printf(s, "dev_evca=%p\n", &dmadev->dev_evca);
seq_printf(s, "dev_evca_phys=%pa\n", &dmadev->evca_resource->start);
sz = resource_size(dmadev->evca_resource);
seq_printf(s, "dev_evca_size=%pa\n", &sz);
return 0;
}
static int hidma_chan_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, hidma_chan_stats, inode->i_private);
}
static int hidma_dma_info_open(struct inode *inode, struct file *file)
{
return single_open(file, hidma_dma_info, inode->i_private);
}
static const struct file_operations hidma_chan_fops = {
.open = hidma_chan_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations hidma_dma_fops = {
.open = hidma_dma_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void hidma_debug_uninit(struct hidma_dev *dmadev)
{
debugfs_remove_recursive(dmadev->debugfs);
debugfs_remove_recursive(dmadev->stats);
}
int hidma_debug_init(struct hidma_dev *dmadev)
{
int rc = 0;
int chidx = 0;
struct list_head *position = NULL;
dmadev->debugfs = debugfs_create_dir(dev_name(dmadev->ddev.dev), NULL);
if (!dmadev->debugfs) {
rc = -ENODEV;
return rc;
}
/* walk through the virtual channel list */
list_for_each(position, &dmadev->ddev.channels) {
struct hidma_chan *chan;
chan = list_entry(position, struct hidma_chan,
chan.device_node);
sprintf(chan->dbg_name, "chan%d", chidx);
chan->debugfs = debugfs_create_dir(chan->dbg_name,
dmadev->debugfs);
if (!chan->debugfs) {
rc = -ENOMEM;
goto cleanup;
}
chan->stats = debugfs_create_file("stats", S_IRUGO,
chan->debugfs, chan,
&hidma_chan_fops);
if (!chan->stats) {
rc = -ENOMEM;
goto cleanup;
}
chidx++;
}
dmadev->stats = debugfs_create_file("stats", S_IRUGO,
dmadev->debugfs, dmadev,
&hidma_dma_fops);
if (!dmadev->stats) {
rc = -ENOMEM;
goto cleanup;
}
return 0;
cleanup:
hidma_debug_uninit(dmadev);
return rc;
}

872
drivers/dma/qcom/hidma_ll.c 100644
View File

@ -0,0 +1,872 @@
/*
* Qualcomm Technologies HIDMA DMA engine low level code
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <linux/iopoll.h>
#include <linux/kfifo.h>
#include <linux/bitops.h>
#include "hidma.h"
#define HIDMA_EVRE_SIZE 16 /* each EVRE is 16 bytes */
#define HIDMA_TRCA_CTRLSTS_REG 0x000
#define HIDMA_TRCA_RING_LOW_REG 0x008
#define HIDMA_TRCA_RING_HIGH_REG 0x00C
#define HIDMA_TRCA_RING_LEN_REG 0x010
#define HIDMA_TRCA_DOORBELL_REG 0x400
#define HIDMA_EVCA_CTRLSTS_REG 0x000
#define HIDMA_EVCA_INTCTRL_REG 0x004
#define HIDMA_EVCA_RING_LOW_REG 0x008
#define HIDMA_EVCA_RING_HIGH_REG 0x00C
#define HIDMA_EVCA_RING_LEN_REG 0x010
#define HIDMA_EVCA_WRITE_PTR_REG 0x020
#define HIDMA_EVCA_DOORBELL_REG 0x400
#define HIDMA_EVCA_IRQ_STAT_REG 0x100
#define HIDMA_EVCA_IRQ_CLR_REG 0x108
#define HIDMA_EVCA_IRQ_EN_REG 0x110
#define HIDMA_EVRE_CFG_IDX 0
#define HIDMA_EVRE_ERRINFO_BIT_POS 24
#define HIDMA_EVRE_CODE_BIT_POS 28
#define HIDMA_EVRE_ERRINFO_MASK GENMASK(3, 0)
#define HIDMA_EVRE_CODE_MASK GENMASK(3, 0)
#define HIDMA_CH_CONTROL_MASK GENMASK(7, 0)
#define HIDMA_CH_STATE_MASK GENMASK(7, 0)
#define HIDMA_CH_STATE_BIT_POS 0x8
#define HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS 0
#define HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS 1
#define HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS 9
#define HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS 10
#define HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS 11
#define HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS 14
#define ENABLE_IRQS (BIT(HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS) | \
BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS))
#define HIDMA_INCREMENT_ITERATOR(iter, size, ring_size) \
do { \
iter += size; \
if (iter >= ring_size) \
iter -= ring_size; \
} while (0)
#define HIDMA_CH_STATE(val) \
((val >> HIDMA_CH_STATE_BIT_POS) & HIDMA_CH_STATE_MASK)
#define HIDMA_ERR_INT_MASK \
(BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS))
enum ch_command {
HIDMA_CH_DISABLE = 0,
HIDMA_CH_ENABLE = 1,
HIDMA_CH_SUSPEND = 2,
HIDMA_CH_RESET = 9,
};
enum ch_state {
HIDMA_CH_DISABLED = 0,
HIDMA_CH_ENABLED = 1,
HIDMA_CH_RUNNING = 2,
HIDMA_CH_SUSPENDED = 3,
HIDMA_CH_STOPPED = 4,
};
enum tre_type {
HIDMA_TRE_MEMCPY = 3,
};
enum err_code {
HIDMA_EVRE_STATUS_COMPLETE = 1,
HIDMA_EVRE_STATUS_ERROR = 4,
};
static int hidma_is_chan_enabled(int state)
{
switch (state) {
case HIDMA_CH_ENABLED:
case HIDMA_CH_RUNNING:
return true;
default:
return false;
}
}
void hidma_ll_free(struct hidma_lldev *lldev, u32 tre_ch)
{
struct hidma_tre *tre;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in free:%d", tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
if (atomic_read(&tre->allocated) != true) {
dev_err(lldev->dev, "trying to free an unused TRE:%d", tre_ch);
return;
}
atomic_set(&tre->allocated, 0);
}
int hidma_ll_request(struct hidma_lldev *lldev, u32 sig, const char *dev_name,
void (*callback)(void *data), void *data, u32 *tre_ch)
{
unsigned int i;
struct hidma_tre *tre;
u32 *tre_local;
if (!tre_ch || !lldev)
return -EINVAL;
/* need to have at least one empty spot in the queue */
for (i = 0; i < lldev->nr_tres - 1; i++) {
if (atomic_add_unless(&lldev->trepool[i].allocated, 1, 1))
break;
}
if (i == (lldev->nr_tres - 1))
return -ENOMEM;
tre = &lldev->trepool[i];
tre->dma_sig = sig;
tre->dev_name = dev_name;
tre->callback = callback;
tre->data = data;
tre->idx = i;
tre->status = 0;
tre->queued = 0;
tre->err_code = 0;
tre->err_info = 0;
tre->lldev = lldev;
tre_local = &tre->tre_local[0];
tre_local[HIDMA_TRE_CFG_IDX] = HIDMA_TRE_MEMCPY;
tre_local[HIDMA_TRE_CFG_IDX] |= (lldev->chidx & 0xFF) << 8;
tre_local[HIDMA_TRE_CFG_IDX] |= BIT(16); /* set IEOB */
*tre_ch = i;
if (callback)
callback(data);
return 0;
}
/*
* Multiple TREs may be queued and waiting in the pending queue.
*/
static void hidma_ll_tre_complete(unsigned long arg)
{
struct hidma_lldev *lldev = (struct hidma_lldev *)arg;
struct hidma_tre *tre;
while (kfifo_out(&lldev->handoff_fifo, &tre, 1)) {
/* call the user if it has been read by the hardware */
if (tre->callback)
tre->callback(tre->data);
}
}
static int hidma_post_completed(struct hidma_lldev *lldev, int tre_iterator,
u8 err_info, u8 err_code)
{
struct hidma_tre *tre;
unsigned long flags;
spin_lock_irqsave(&lldev->lock, flags);
tre = lldev->pending_tre_list[tre_iterator / HIDMA_TRE_SIZE];
if (!tre) {
spin_unlock_irqrestore(&lldev->lock, flags);
dev_warn(lldev->dev, "tre_index [%d] and tre out of sync\n",
tre_iterator / HIDMA_TRE_SIZE);
return -EINVAL;
}
lldev->pending_tre_list[tre->tre_index] = NULL;
/*
* Keep track of pending TREs that SW is expecting to receive
* from HW. We got one now. Decrement our counter.
*/
lldev->pending_tre_count--;
if (lldev->pending_tre_count < 0) {
dev_warn(lldev->dev, "tre count mismatch on completion");
lldev->pending_tre_count = 0;
}
spin_unlock_irqrestore(&lldev->lock, flags);
tre->err_info = err_info;
tre->err_code = err_code;
tre->queued = 0;
kfifo_put(&lldev->handoff_fifo, tre);
tasklet_schedule(&lldev->task);
return 0;
}
/*
* Called to handle the interrupt for the channel.
* Return a positive number if TRE or EVRE were consumed on this run.
* Return a positive number if there are pending TREs or EVREs.
* Return 0 if there is nothing to consume or no pending TREs/EVREs found.
*/
static int hidma_handle_tre_completion(struct hidma_lldev *lldev)
{
u32 evre_ring_size = lldev->evre_ring_size;
u32 tre_ring_size = lldev->tre_ring_size;
u32 err_info, err_code, evre_write_off;
u32 tre_iterator, evre_iterator;
u32 num_completed = 0;
evre_write_off = readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
tre_iterator = lldev->tre_processed_off;
evre_iterator = lldev->evre_processed_off;
if ((evre_write_off > evre_ring_size) ||
(evre_write_off % HIDMA_EVRE_SIZE)) {
dev_err(lldev->dev, "HW reports invalid EVRE write offset\n");
return 0;
}
/*
* By the time control reaches here the number of EVREs and TREs
* may not match. Only consume the ones that hardware told us.
*/
while ((evre_iterator != evre_write_off)) {
u32 *current_evre = lldev->evre_ring + evre_iterator;
u32 cfg;
cfg = current_evre[HIDMA_EVRE_CFG_IDX];
err_info = cfg >> HIDMA_EVRE_ERRINFO_BIT_POS;
err_info &= HIDMA_EVRE_ERRINFO_MASK;
err_code =
(cfg >> HIDMA_EVRE_CODE_BIT_POS) & HIDMA_EVRE_CODE_MASK;
if (hidma_post_completed(lldev, tre_iterator, err_info,
err_code))
break;
HIDMA_INCREMENT_ITERATOR(tre_iterator, HIDMA_TRE_SIZE,
tre_ring_size);
HIDMA_INCREMENT_ITERATOR(evre_iterator, HIDMA_EVRE_SIZE,
evre_ring_size);
/*
* Read the new event descriptor written by the HW.
* As we are processing the delivered events, other events
* get queued to the SW for processing.
*/
evre_write_off =
readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
num_completed++;
}
if (num_completed) {
u32 evre_read_off = (lldev->evre_processed_off +
HIDMA_EVRE_SIZE * num_completed);
u32 tre_read_off = (lldev->tre_processed_off +
HIDMA_TRE_SIZE * num_completed);
evre_read_off = evre_read_off % evre_ring_size;
tre_read_off = tre_read_off % tre_ring_size;
writel(evre_read_off, lldev->evca + HIDMA_EVCA_DOORBELL_REG);
/* record the last processed tre offset */
lldev->tre_processed_off = tre_read_off;
lldev->evre_processed_off = evre_read_off;
}
return num_completed;
}
void hidma_cleanup_pending_tre(struct hidma_lldev *lldev, u8 err_info,
u8 err_code)
{
u32 tre_iterator;
u32 tre_ring_size = lldev->tre_ring_size;
int num_completed = 0;
u32 tre_read_off;
tre_iterator = lldev->tre_processed_off;
while (lldev->pending_tre_count) {
if (hidma_post_completed(lldev, tre_iterator, err_info,
err_code))
break;
HIDMA_INCREMENT_ITERATOR(tre_iterator, HIDMA_TRE_SIZE,
tre_ring_size);
num_completed++;
}
tre_read_off = (lldev->tre_processed_off +
HIDMA_TRE_SIZE * num_completed);
tre_read_off = tre_read_off % tre_ring_size;
/* record the last processed tre offset */
lldev->tre_processed_off = tre_read_off;
}
static int hidma_ll_reset(struct hidma_lldev *lldev)
{
u32 val;
int ret;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_RESET << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
/*
* Delay 10ms after reset to allow DMA logic to quiesce.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
1000, 10000);
if (ret) {
dev_err(lldev->dev, "transfer channel did not reset\n");
return ret;
}
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_RESET << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
/*
* Delay 10ms after reset to allow DMA logic to quiesce.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
1000, 10000);
if (ret)
return ret;
lldev->trch_state = HIDMA_CH_DISABLED;
lldev->evch_state = HIDMA_CH_DISABLED;
return 0;
}
/*
* Abort all transactions and perform a reset.
*/
static void hidma_ll_abort(unsigned long arg)
{
struct hidma_lldev *lldev = (struct hidma_lldev *)arg;
u8 err_code = HIDMA_EVRE_STATUS_ERROR;
u8 err_info = 0xFF;
int rc;
hidma_cleanup_pending_tre(lldev, err_info, err_code);
/* reset the channel for recovery */
rc = hidma_ll_setup(lldev);
if (rc) {
dev_err(lldev->dev, "channel reinitialize failed after error\n");
return;
}
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
}
/*
* The interrupt handler for HIDMA will try to consume as many pending
* EVRE from the event queue as possible. Each EVRE has an associated
* TRE that holds the user interface parameters. EVRE reports the
* result of the transaction. Hardware guarantees ordering between EVREs
* and TREs. We use last processed offset to figure out which TRE is
* associated with which EVRE. If two TREs are consumed by HW, the EVREs
* are in order in the event ring.
*
* This handler will do a one pass for consuming EVREs. Other EVREs may
* be delivered while we are working. It will try to consume incoming
* EVREs one more time and return.
*
* For unprocessed EVREs, hardware will trigger another interrupt until
* all the interrupt bits are cleared.
*
* Hardware guarantees that by the time interrupt is observed, all data
* transactions in flight are delivered to their respective places and
* are visible to the CPU.
*
* On demand paging for IOMMU is only supported for PCIe via PRI
* (Page Request Interface) not for HIDMA. All other hardware instances
* including HIDMA work on pinned DMA addresses.
*
* HIDMA is not aware of IOMMU presence since it follows the DMA API. All
* IOMMU latency will be built into the data movement time. By the time
* interrupt happens, IOMMU lookups + data movement has already taken place.
*
* While the first read in a typical PCI endpoint ISR flushes all outstanding
* requests traditionally to the destination, this concept does not apply
* here for this HW.
*/
irqreturn_t hidma_ll_inthandler(int chirq, void *arg)
{
struct hidma_lldev *lldev = arg;
u32 status;
u32 enable;
u32 cause;
/*
* Fine tuned for this HW...
*
* This ISR has been designed for this particular hardware. Relaxed
* read and write accessors are used for performance reasons due to
* interrupt delivery guarantees. Do not copy this code blindly and
* expect that to work.
*/
status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
cause = status & enable;
while (cause) {
if (cause & HIDMA_ERR_INT_MASK) {
dev_err(lldev->dev, "error 0x%x, resetting...\n",
cause);
/* Clear out pending interrupts */
writel(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
tasklet_schedule(&lldev->rst_task);
goto out;
}
/*
* Try to consume as many EVREs as possible.
*/
hidma_handle_tre_completion(lldev);
/* We consumed TREs or there are pending TREs or EVREs. */
writel_relaxed(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
/*
* Another interrupt might have arrived while we are
* processing this one. Read the new cause.
*/
status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
cause = status & enable;
}
out:
return IRQ_HANDLED;
}
int hidma_ll_enable(struct hidma_lldev *lldev)
{
u32 val;
int ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_ENABLE << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
1000, 10000);
if (ret) {
dev_err(lldev->dev, "event channel did not get enabled\n");
return ret;
}
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_ENABLE << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
1000, 10000);
if (ret) {
dev_err(lldev->dev, "transfer channel did not get enabled\n");
return ret;
}
lldev->trch_state = HIDMA_CH_ENABLED;
lldev->evch_state = HIDMA_CH_ENABLED;
return 0;
}
void hidma_ll_start(struct hidma_lldev *lldev)
{
unsigned long irqflags;
spin_lock_irqsave(&lldev->lock, irqflags);
writel(lldev->tre_write_offset, lldev->trca + HIDMA_TRCA_DOORBELL_REG);
spin_unlock_irqrestore(&lldev->lock, irqflags);
}
bool hidma_ll_isenabled(struct hidma_lldev *lldev)
{
u32 val;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
lldev->trch_state = HIDMA_CH_STATE(val);
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
lldev->evch_state = HIDMA_CH_STATE(val);
/* both channels have to be enabled before calling this function */
if (hidma_is_chan_enabled(lldev->trch_state) &&
hidma_is_chan_enabled(lldev->evch_state))
return true;
return false;
}
void hidma_ll_queue_request(struct hidma_lldev *lldev, u32 tre_ch)
{
struct hidma_tre *tre;
unsigned long flags;
tre = &lldev->trepool[tre_ch];
/* copy the TRE into its location in the TRE ring */
spin_lock_irqsave(&lldev->lock, flags);
tre->tre_index = lldev->tre_write_offset / HIDMA_TRE_SIZE;
lldev->pending_tre_list[tre->tre_index] = tre;
memcpy(lldev->tre_ring + lldev->tre_write_offset,
&tre->tre_local[0], HIDMA_TRE_SIZE);
tre->err_code = 0;
tre->err_info = 0;
tre->queued = 1;
lldev->pending_tre_count++;
lldev->tre_write_offset = (lldev->tre_write_offset + HIDMA_TRE_SIZE)
% lldev->tre_ring_size;
spin_unlock_irqrestore(&lldev->lock, flags);
}
/*
* Note that even though we stop this channel if there is a pending transaction
* in flight it will complete and follow the callback. This request will
* prevent further requests to be made.
*/
int hidma_ll_disable(struct hidma_lldev *lldev)
{
u32 val;
int ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
lldev->evch_state = HIDMA_CH_STATE(val);
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
lldev->trch_state = HIDMA_CH_STATE(val);
/* already suspended by this OS */
if ((lldev->trch_state == HIDMA_CH_SUSPENDED) ||
(lldev->evch_state == HIDMA_CH_SUSPENDED))
return 0;
/* already stopped by the manager */
if ((lldev->trch_state == HIDMA_CH_STOPPED) ||
(lldev->evch_state == HIDMA_CH_STOPPED))
return 0;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_SUSPEND << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
/*
* Start the wait right after the suspend is confirmed.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
1000, 10000);
if (ret)
return ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_SUSPEND << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
/*
* Start the wait right after the suspend is confirmed
* Delay up to 10ms after reset to allow DMA logic to quiesce.
*/
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
1000, 10000);
if (ret)
return ret;
lldev->trch_state = HIDMA_CH_SUSPENDED;
lldev->evch_state = HIDMA_CH_SUSPENDED;
return 0;
}
void hidma_ll_set_transfer_params(struct hidma_lldev *lldev, u32 tre_ch,
dma_addr_t src, dma_addr_t dest, u32 len,
u32 flags)
{
struct hidma_tre *tre;
u32 *tre_local;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in transfer params:%d",
tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
if (atomic_read(&tre->allocated) != true) {
dev_err(lldev->dev, "trying to set params on an unused TRE:%d",
tre_ch);
return;
}
tre_local = &tre->tre_local[0];
tre_local[HIDMA_TRE_LEN_IDX] = len;
tre_local[HIDMA_TRE_SRC_LOW_IDX] = lower_32_bits(src);
tre_local[HIDMA_TRE_SRC_HI_IDX] = upper_32_bits(src);
tre_local[HIDMA_TRE_DEST_LOW_IDX] = lower_32_bits(dest);
tre_local[HIDMA_TRE_DEST_HI_IDX] = upper_32_bits(dest);
tre->int_flags = flags;
}
/*
* Called during initialization and after an error condition
* to restore hardware state.
*/
int hidma_ll_setup(struct hidma_lldev *lldev)
{
int rc;
u64 addr;
u32 val;
u32 nr_tres = lldev->nr_tres;
lldev->pending_tre_count = 0;
lldev->tre_processed_off = 0;
lldev->evre_processed_off = 0;
lldev->tre_write_offset = 0;
/* disable interrupts */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
/* clear all pending interrupts */
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
rc = hidma_ll_reset(lldev);
if (rc)
return rc;
/*
* Clear all pending interrupts again.
* Otherwise, we observe reset complete interrupts.
*/
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
/* disable interrupts again after reset */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
addr = lldev->tre_dma;
writel(lower_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_LOW_REG);
writel(upper_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_HIGH_REG);
writel(lldev->tre_ring_size, lldev->trca + HIDMA_TRCA_RING_LEN_REG);
addr = lldev->evre_dma;
writel(lower_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_LOW_REG);
writel(upper_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_HIGH_REG);
writel(HIDMA_EVRE_SIZE * nr_tres,
lldev->evca + HIDMA_EVCA_RING_LEN_REG);
/* support IRQ only for now */
val = readl(lldev->evca + HIDMA_EVCA_INTCTRL_REG);
val &= ~0xF;
val |= 0x1;
writel(val, lldev->evca + HIDMA_EVCA_INTCTRL_REG);
/* clear all pending interrupts and enable them */
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return hidma_ll_enable(lldev);
}
struct hidma_lldev *hidma_ll_init(struct device *dev, u32 nr_tres,
void __iomem *trca, void __iomem *evca,
u8 chidx)
{
u32 required_bytes;
struct hidma_lldev *lldev;
int rc;
size_t sz;
if (!trca || !evca || !dev || !nr_tres)
return NULL;
/* need at least four TREs */
if (nr_tres < 4)
return NULL;
/* need an extra space */
nr_tres += 1;
lldev = devm_kzalloc(dev, sizeof(struct hidma_lldev), GFP_KERNEL);
if (!lldev)
return NULL;
lldev->evca = evca;
lldev->trca = trca;
lldev->dev = dev;
sz = sizeof(struct hidma_tre);
lldev->trepool = devm_kcalloc(lldev->dev, nr_tres, sz, GFP_KERNEL);
if (!lldev->trepool)
return NULL;
required_bytes = sizeof(lldev->pending_tre_list[0]);
lldev->pending_tre_list = devm_kcalloc(dev, nr_tres, required_bytes,
GFP_KERNEL);
if (!lldev->pending_tre_list)
return NULL;
sz = (HIDMA_TRE_SIZE + 1) * nr_tres;
lldev->tre_ring = dmam_alloc_coherent(dev, sz, &lldev->tre_dma,
GFP_KERNEL);
if (!lldev->tre_ring)
return NULL;
memset(lldev->tre_ring, 0, (HIDMA_TRE_SIZE + 1) * nr_tres);
lldev->tre_ring_size = HIDMA_TRE_SIZE * nr_tres;
lldev->nr_tres = nr_tres;
/* the TRE ring has to be TRE_SIZE aligned */
if (!IS_ALIGNED(lldev->tre_dma, HIDMA_TRE_SIZE)) {
u8 tre_ring_shift;
tre_ring_shift = lldev->tre_dma % HIDMA_TRE_SIZE;
tre_ring_shift = HIDMA_TRE_SIZE - tre_ring_shift;
lldev->tre_dma += tre_ring_shift;
lldev->tre_ring += tre_ring_shift;
}
sz = (HIDMA_EVRE_SIZE + 1) * nr_tres;
lldev->evre_ring = dmam_alloc_coherent(dev, sz, &lldev->evre_dma,
GFP_KERNEL);
if (!lldev->evre_ring)
return NULL;
memset(lldev->evre_ring, 0, (HIDMA_EVRE_SIZE + 1) * nr_tres);
lldev->evre_ring_size = HIDMA_EVRE_SIZE * nr_tres;
/* the EVRE ring has to be EVRE_SIZE aligned */
if (!IS_ALIGNED(lldev->evre_dma, HIDMA_EVRE_SIZE)) {
u8 evre_ring_shift;
evre_ring_shift = lldev->evre_dma % HIDMA_EVRE_SIZE;
evre_ring_shift = HIDMA_EVRE_SIZE - evre_ring_shift;
lldev->evre_dma += evre_ring_shift;
lldev->evre_ring += evre_ring_shift;
}
lldev->nr_tres = nr_tres;
lldev->chidx = chidx;
sz = nr_tres * sizeof(struct hidma_tre *);
rc = kfifo_alloc(&lldev->handoff_fifo, sz, GFP_KERNEL);
if (rc)
return NULL;
rc = hidma_ll_setup(lldev);
if (rc)
return NULL;
spin_lock_init(&lldev->lock);
tasklet_init(&lldev->rst_task, hidma_ll_abort, (unsigned long)lldev);
tasklet_init(&lldev->task, hidma_ll_tre_complete, (unsigned long)lldev);
lldev->initialized = 1;
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return lldev;
}
int hidma_ll_uninit(struct hidma_lldev *lldev)
{
u32 required_bytes;
int rc = 0;
u32 val;
if (!lldev)
return -ENODEV;
if (!lldev->initialized)
return 0;
lldev->initialized = 0;
required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres;
tasklet_kill(&lldev->task);
memset(lldev->trepool, 0, required_bytes);
lldev->trepool = NULL;
lldev->pending_tre_count = 0;
lldev->tre_write_offset = 0;
rc = hidma_ll_reset(lldev);
/*
* Clear all pending interrupts again.
* Otherwise, we observe reset complete interrupts.
*/
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return rc;
}
enum dma_status hidma_ll_status(struct hidma_lldev *lldev, u32 tre_ch)
{
enum dma_status ret = DMA_ERROR;
struct hidma_tre *tre;
unsigned long flags;
u8 err_code;
spin_lock_irqsave(&lldev->lock, flags);
tre = &lldev->trepool[tre_ch];
err_code = tre->err_code;
if (err_code & HIDMA_EVRE_STATUS_COMPLETE)
ret = DMA_COMPLETE;
else if (err_code & HIDMA_EVRE_STATUS_ERROR)
ret = DMA_ERROR;
else
ret = DMA_IN_PROGRESS;
spin_unlock_irqrestore(&lldev->lock, flags);
return ret;
}

113
drivers/dma/qcom/hidma_mgmt.c
View File

@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine Management interface
*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -17,13 +17,14 @@
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include "hidma_mgmt.h"
@ -298,5 +299,109 @@ static struct platform_driver hidma_mgmt_driver = {
},
};
module_platform_driver(hidma_mgmt_driver);
#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
static int object_counter;
static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
{
struct platform_device *pdev_parent = of_find_device_by_node(np);
struct platform_device_info pdevinfo;
struct of_phandle_args out_irq;
struct device_node *child;
struct resource *res;
const __be32 *cell;
int ret = 0, size, i, num;
u64 addr, addr_size;
for_each_available_child_of_node(np, child) {
struct resource *res_iter;
struct platform_device *new_pdev;
cell = of_get_property(child, "reg", &size);
if (!cell) {
ret = -EINVAL;
goto out;
}
size /= sizeof(*cell);
num = size /
(of_n_addr_cells(child) + of_n_size_cells(child)) + 1;
/* allocate a resource array */
res = kcalloc(num, sizeof(*res), GFP_KERNEL);
if (!res) {
ret = -ENOMEM;
goto out;
}
/* read each reg value */
i = 0;
res_iter = res;
while (i < size) {
addr = of_read_number(&cell[i],
of_n_addr_cells(child));
i += of_n_addr_cells(child);
addr_size = of_read_number(&cell[i],
of_n_size_cells(child));
i += of_n_size_cells(child);
res_iter->start = addr;
res_iter->end = res_iter->start + addr_size - 1;
res_iter->flags = IORESOURCE_MEM;
res_iter++;
}
ret = of_irq_parse_one(child, 0, &out_irq);
if (ret)
goto out;
res_iter->start = irq_create_of_mapping(&out_irq);
res_iter->name = "hidma event irq";
res_iter->flags = IORESOURCE_IRQ;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo.fwnode = &child->fwnode;
pdevinfo.parent = pdev_parent ? &pdev_parent->dev : NULL;
pdevinfo.name = child->name;
pdevinfo.id = object_counter++;
pdevinfo.res = res;
pdevinfo.num_res = num;
pdevinfo.data = NULL;
pdevinfo.size_data = 0;
pdevinfo.dma_mask = DMA_BIT_MASK(64);
new_pdev = platform_device_register_full(&pdevinfo);
if (!new_pdev) {
ret = -ENODEV;
goto out;
}
of_dma_configure(&new_pdev->dev, child);
kfree(res);
res = NULL;
}
out:
kfree(res);
return ret;
}
#endif
static int __init hidma_mgmt_init(void)
{
#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
struct device_node *child;
for (child = of_find_matching_node(NULL, hidma_mgmt_match); child;
child = of_find_matching_node(child, hidma_mgmt_match)) {
/* device tree based firmware here */
hidma_mgmt_of_populate_channels(child);
of_node_put(child);
}
#endif
platform_driver_register(&hidma_mgmt_driver);
return 0;
}
module_init(hidma_mgmt_init);
MODULE_LICENSE("GPL v2");