linux-stable/drivers/dma/qcom/qcom_adm.c
Arnd Bergmann 03de6b2738 dmaengine: qcom-adm: stop abusing slave_id config
The slave_id was previously used to pick one DMA slave instead of another,
but this is now done through the DMA descriptors in device tree.

For the qcom_adm driver, the configuration is documented in the DT
binding to contain a tuple of device identifier and a "crci" field,
but the implementation ends up using only a single cell for identifying
the slave, with the crci getting passed in nonstandard properties of
the device, and passed through the dma driver using the old slave_id
field. Part of the problem apparently is that the nand driver ends up
using only a single DMA request ID, but requires distinct values for
"crci" depending on the type of transfer.

Change both the dmaengine driver and the two slave drivers to allow
the documented binding to work in addition to the ad-hoc passing
of crci values. In order to no longer abuse the slave_id field, pass
the data using the "peripheral_config" mechanism instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20211122222203.4103644-9-arnd@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-12-17 11:23:56 +05:30

947 lines
24 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma/qcom_adm.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
/* ADM registers - calculated from channel number and security domain */
#define ADM_CHAN_MULTI 0x4
#define ADM_CI_MULTI 0x4
#define ADM_CRCI_MULTI 0x4
#define ADM_EE_MULTI 0x800
#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
#define ADM_EE_OFFS(ee) (ADM_EE_MULTI * (ee))
#define ADM_CHAN_EE_OFFS(chan, ee) (ADM_CHAN_OFFS(chan) + ADM_EE_OFFS(ee))
#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
#define ADM_CI_OFFS(ci) (ADM_CHAN_OFF(ci))
#define ADM_CH_CMD_PTR(chan, ee) (ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_RSLT(chan, ee) (0x40 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_FLUSH_STATE0(chan, ee) (0x80 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_STATUS_SD(chan, ee) (0x200 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_CONF(chan) (0x240 + ADM_CHAN_OFFS(chan))
#define ADM_CH_RSLT_CONF(chan, ee) (0x300 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + ADM_EE_OFFS(ee))
#define ADM_CI_CONF(ci) (0x390 + (ci) * ADM_CI_MULTI)
#define ADM_GP_CTL 0x3d8
#define ADM_CRCI_CTL(crci, ee) (0x400 + (crci) * ADM_CRCI_MULTI + \
ADM_EE_OFFS(ee))
/* channel status */
#define ADM_CH_STATUS_VALID BIT(1)
/* channel result */
#define ADM_CH_RSLT_VALID BIT(31)
#define ADM_CH_RSLT_ERR BIT(3)
#define ADM_CH_RSLT_FLUSH BIT(2)
#define ADM_CH_RSLT_TPD BIT(1)
/* channel conf */
#define ADM_CH_CONF_SHADOW_EN BIT(12)
#define ADM_CH_CONF_MPU_DISABLE BIT(11)
#define ADM_CH_CONF_PERM_MPU_CONF BIT(9)
#define ADM_CH_CONF_FORCE_RSLT_EN BIT(7)
#define ADM_CH_CONF_SEC_DOMAIN(ee) ((((ee) & 0x3) << 4) | (((ee) & 0x4) << 11))
/* channel result conf */
#define ADM_CH_RSLT_CONF_FLUSH_EN BIT(1)
#define ADM_CH_RSLT_CONF_IRQ_EN BIT(0)
/* CRCI CTL */
#define ADM_CRCI_CTL_MUX_SEL BIT(18)
#define ADM_CRCI_CTL_RST BIT(17)
/* CI configuration */
#define ADM_CI_RANGE_END(x) ((x) << 24)
#define ADM_CI_RANGE_START(x) ((x) << 16)
#define ADM_CI_BURST_4_WORDS BIT(2)
#define ADM_CI_BURST_8_WORDS BIT(3)
/* GP CTL */
#define ADM_GP_CTL_LP_EN BIT(12)
#define ADM_GP_CTL_LP_CNT(x) ((x) << 8)
/* Command pointer list entry */
#define ADM_CPLE_LP BIT(31)
#define ADM_CPLE_CMD_PTR_LIST BIT(29)
/* Command list entry */
#define ADM_CMD_LC BIT(31)
#define ADM_CMD_DST_CRCI(n) (((n) & 0xf) << 7)
#define ADM_CMD_SRC_CRCI(n) (((n) & 0xf) << 3)
#define ADM_CMD_TYPE_SINGLE 0x0
#define ADM_CMD_TYPE_BOX 0x3
#define ADM_CRCI_MUX_SEL BIT(4)
#define ADM_DESC_ALIGN 8
#define ADM_MAX_XFER (SZ_64K - 1)
#define ADM_MAX_ROWS (SZ_64K - 1)
#define ADM_MAX_CHANNELS 16
struct adm_desc_hw_box {
u32 cmd;
u32 src_addr;
u32 dst_addr;
u32 row_len;
u32 num_rows;
u32 row_offset;
};
struct adm_desc_hw_single {
u32 cmd;
u32 src_addr;
u32 dst_addr;
u32 len;
};
struct adm_async_desc {
struct virt_dma_desc vd;
struct adm_device *adev;
size_t length;
enum dma_transfer_direction dir;
dma_addr_t dma_addr;
size_t dma_len;
void *cpl;
dma_addr_t cp_addr;
u32 crci;
u32 mux;
u32 blk_size;
};
struct adm_chan {
struct virt_dma_chan vc;
struct adm_device *adev;
/* parsed from DT */
u32 id; /* channel id */
struct adm_async_desc *curr_txd;
struct dma_slave_config slave;
u32 crci;
u32 mux;
struct list_head node;
int error;
int initialized;
};
static inline struct adm_chan *to_adm_chan(struct dma_chan *common)
{
return container_of(common, struct adm_chan, vc.chan);
}
struct adm_device {
void __iomem *regs;
struct device *dev;
struct dma_device common;
struct device_dma_parameters dma_parms;
struct adm_chan *channels;
u32 ee;
struct clk *core_clk;
struct clk *iface_clk;
struct reset_control *clk_reset;
struct reset_control *c0_reset;
struct reset_control *c1_reset;
struct reset_control *c2_reset;
int irq;
};
/**
* adm_free_chan - Frees dma resources associated with the specific channel
*
* @chan: dma channel
*
* Free all allocated descriptors associated with this channel
*/
static void adm_free_chan(struct dma_chan *chan)
{
/* free all queued descriptors */
vchan_free_chan_resources(to_virt_chan(chan));
}
/**
* adm_get_blksize - Get block size from burst value
*
* @burst: Burst size of transaction
*/
static int adm_get_blksize(unsigned int burst)
{
int ret;
switch (burst) {
case 16:
case 32:
case 64:
case 128:
ret = ffs(burst >> 4) - 1;
break;
case 192:
ret = 4;
break;
case 256:
ret = 5;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
/**
* adm_process_fc_descriptors - Process descriptors for flow controlled xfers
*
* @achan: ADM channel
* @desc: Descriptor memory pointer
* @sg: Scatterlist entry
* @crci: CRCI value
* @burst: Burst size of transaction
* @direction: DMA transfer direction
*/
static void *adm_process_fc_descriptors(struct adm_chan *achan, void *desc,
struct scatterlist *sg, u32 crci,
u32 burst,
enum dma_transfer_direction direction)
{
struct adm_desc_hw_box *box_desc = NULL;
struct adm_desc_hw_single *single_desc;
u32 remainder = sg_dma_len(sg);
u32 rows, row_offset, crci_cmd;
u32 mem_addr = sg_dma_address(sg);
u32 *incr_addr = &mem_addr;
u32 *src, *dst;
if (direction == DMA_DEV_TO_MEM) {
crci_cmd = ADM_CMD_SRC_CRCI(crci);
row_offset = burst;
src = &achan->slave.src_addr;
dst = &mem_addr;
} else {
crci_cmd = ADM_CMD_DST_CRCI(crci);
row_offset = burst << 16;
src = &mem_addr;
dst = &achan->slave.dst_addr;
}
while (remainder >= burst) {
box_desc = desc;
box_desc->cmd = ADM_CMD_TYPE_BOX | crci_cmd;
box_desc->row_offset = row_offset;
box_desc->src_addr = *src;
box_desc->dst_addr = *dst;
rows = remainder / burst;
rows = min_t(u32, rows, ADM_MAX_ROWS);
box_desc->num_rows = rows << 16 | rows;
box_desc->row_len = burst << 16 | burst;
*incr_addr += burst * rows;
remainder -= burst * rows;
desc += sizeof(*box_desc);
}
/* if leftover bytes, do one single descriptor */
if (remainder) {
single_desc = desc;
single_desc->cmd = ADM_CMD_TYPE_SINGLE | crci_cmd;
single_desc->len = remainder;
single_desc->src_addr = *src;
single_desc->dst_addr = *dst;
desc += sizeof(*single_desc);
if (sg_is_last(sg))
single_desc->cmd |= ADM_CMD_LC;
} else {
if (box_desc && sg_is_last(sg))
box_desc->cmd |= ADM_CMD_LC;
}
return desc;
}
/**
* adm_process_non_fc_descriptors - Process descriptors for non-fc xfers
*
* @achan: ADM channel
* @desc: Descriptor memory pointer
* @sg: Scatterlist entry
* @direction: DMA transfer direction
*/
static void *adm_process_non_fc_descriptors(struct adm_chan *achan, void *desc,
struct scatterlist *sg,
enum dma_transfer_direction direction)
{
struct adm_desc_hw_single *single_desc;
u32 remainder = sg_dma_len(sg);
u32 mem_addr = sg_dma_address(sg);
u32 *incr_addr = &mem_addr;
u32 *src, *dst;
if (direction == DMA_DEV_TO_MEM) {
src = &achan->slave.src_addr;
dst = &mem_addr;
} else {
src = &mem_addr;
dst = &achan->slave.dst_addr;
}
do {
single_desc = desc;
single_desc->cmd = ADM_CMD_TYPE_SINGLE;
single_desc->src_addr = *src;
single_desc->dst_addr = *dst;
single_desc->len = (remainder > ADM_MAX_XFER) ?
ADM_MAX_XFER : remainder;
remainder -= single_desc->len;
*incr_addr += single_desc->len;
desc += sizeof(*single_desc);
} while (remainder);
/* set last command if this is the end of the whole transaction */
if (sg_is_last(sg))
single_desc->cmd |= ADM_CMD_LC;
return desc;
}
/**
* adm_prep_slave_sg - Prep slave sg transaction
*
* @chan: dma channel
* @sgl: scatter gather list
* @sg_len: length of sg
* @direction: DMA transfer direction
* @flags: DMA flags
* @context: transfer context (unused)
*/
static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags,
void *context)
{
struct adm_chan *achan = to_adm_chan(chan);
struct adm_device *adev = achan->adev;
struct adm_async_desc *async_desc;
struct scatterlist *sg;
dma_addr_t cple_addr;
u32 i, burst;
u32 single_count = 0, box_count = 0, crci = 0;
void *desc;
u32 *cple;
int blk_size = 0;
if (!is_slave_direction(direction)) {
dev_err(adev->dev, "invalid dma direction\n");
return NULL;
}
/*
* get burst value from slave configuration
*/
burst = (direction == DMA_MEM_TO_DEV) ?
achan->slave.dst_maxburst :
achan->slave.src_maxburst;
/* if using flow control, validate burst and crci values */
if (achan->slave.device_fc) {
blk_size = adm_get_blksize(burst);
if (blk_size < 0) {
dev_err(adev->dev, "invalid burst value: %d\n",
burst);
return ERR_PTR(-EINVAL);
}
crci = achan->crci & 0xf;
if (!crci || achan->crci > 0x1f) {
dev_err(adev->dev, "invalid crci value\n");
return ERR_PTR(-EINVAL);
}
}
/* iterate through sgs and compute allocation size of structures */
for_each_sg(sgl, sg, sg_len, i) {
if (achan->slave.device_fc) {
box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
ADM_MAX_ROWS);
if (sg_dma_len(sg) % burst)
single_count++;
} else {
single_count += DIV_ROUND_UP(sg_dma_len(sg),
ADM_MAX_XFER);
}
}
async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
if (!async_desc)
return ERR_PTR(-ENOMEM);
async_desc->mux = achan->mux ? ADM_CRCI_CTL_MUX_SEL : 0;
async_desc->crci = crci;
async_desc->blk_size = blk_size;
async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
box_count * sizeof(struct adm_desc_hw_box) +
sizeof(*cple) + 2 * ADM_DESC_ALIGN;
async_desc->cpl = kzalloc(async_desc->dma_len, GFP_NOWAIT);
if (!async_desc->cpl)
goto free;
async_desc->adev = adev;
/* both command list entry and descriptors must be 8 byte aligned */
cple = PTR_ALIGN(async_desc->cpl, ADM_DESC_ALIGN);
desc = PTR_ALIGN(cple + 1, ADM_DESC_ALIGN);
for_each_sg(sgl, sg, sg_len, i) {
async_desc->length += sg_dma_len(sg);
if (achan->slave.device_fc)
desc = adm_process_fc_descriptors(achan, desc, sg, crci,
burst, direction);
else
desc = adm_process_non_fc_descriptors(achan, desc, sg,
direction);
}
async_desc->dma_addr = dma_map_single(adev->dev, async_desc->cpl,
async_desc->dma_len,
DMA_TO_DEVICE);
if (dma_mapping_error(adev->dev, async_desc->dma_addr))
goto free;
cple_addr = async_desc->dma_addr + ((void *)cple - async_desc->cpl);
/* init cmd list */
dma_sync_single_for_cpu(adev->dev, cple_addr, sizeof(*cple),
DMA_TO_DEVICE);
*cple = ADM_CPLE_LP;
*cple |= (async_desc->dma_addr + ADM_DESC_ALIGN) >> 3;
dma_sync_single_for_device(adev->dev, cple_addr, sizeof(*cple),
DMA_TO_DEVICE);
return vchan_tx_prep(&achan->vc, &async_desc->vd, flags);
free:
kfree(async_desc);
return ERR_PTR(-ENOMEM);
}
/**
* adm_terminate_all - terminate all transactions on a channel
* @chan: dma channel
*
* Dequeues and frees all transactions, aborts current transaction
* No callbacks are done
*
*/
static int adm_terminate_all(struct dma_chan *chan)
{
struct adm_chan *achan = to_adm_chan(chan);
struct adm_device *adev = achan->adev;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&achan->vc.lock, flags);
vchan_get_all_descriptors(&achan->vc, &head);
/* send flush command to terminate current transaction */
writel_relaxed(0x0,
adev->regs + ADM_CH_FLUSH_STATE0(achan->id, adev->ee));
spin_unlock_irqrestore(&achan->vc.lock, flags);
vchan_dma_desc_free_list(&achan->vc, &head);
return 0;
}
static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
{
struct adm_chan *achan = to_adm_chan(chan);
struct qcom_adm_peripheral_config *config = cfg->peripheral_config;
unsigned long flag;
spin_lock_irqsave(&achan->vc.lock, flag);
memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
if (cfg->peripheral_size == sizeof(config))
achan->crci = config->crci;
spin_unlock_irqrestore(&achan->vc.lock, flag);
return 0;
}
/**
* adm_start_dma - start next transaction
* @achan: ADM dma channel
*/
static void adm_start_dma(struct adm_chan *achan)
{
struct virt_dma_desc *vd = vchan_next_desc(&achan->vc);
struct adm_device *adev = achan->adev;
struct adm_async_desc *async_desc;
lockdep_assert_held(&achan->vc.lock);
if (!vd)
return;
list_del(&vd->node);
/* write next command list out to the CMD FIFO */
async_desc = container_of(vd, struct adm_async_desc, vd);
achan->curr_txd = async_desc;
/* reset channel error */
achan->error = 0;
if (!achan->initialized) {
/* enable interrupts */
writel(ADM_CH_CONF_SHADOW_EN |
ADM_CH_CONF_PERM_MPU_CONF |
ADM_CH_CONF_MPU_DISABLE |
ADM_CH_CONF_SEC_DOMAIN(adev->ee),
adev->regs + ADM_CH_CONF(achan->id));
writel(ADM_CH_RSLT_CONF_IRQ_EN | ADM_CH_RSLT_CONF_FLUSH_EN,
adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
achan->initialized = 1;
}
/* set the crci block size if this transaction requires CRCI */
if (async_desc->crci) {
writel(async_desc->mux | async_desc->blk_size,
adev->regs + ADM_CRCI_CTL(async_desc->crci, adev->ee));
}
/* make sure IRQ enable doesn't get reordered */
wmb();
/* write next command list out to the CMD FIFO */
writel(ALIGN(async_desc->dma_addr, ADM_DESC_ALIGN) >> 3,
adev->regs + ADM_CH_CMD_PTR(achan->id, adev->ee));
}
/**
* adm_dma_irq - irq handler for ADM controller
* @irq: IRQ of interrupt
* @data: callback data
*
* IRQ handler for the bam controller
*/
static irqreturn_t adm_dma_irq(int irq, void *data)
{
struct adm_device *adev = data;
u32 srcs, i;
struct adm_async_desc *async_desc;
unsigned long flags;
srcs = readl_relaxed(adev->regs +
ADM_SEC_DOMAIN_IRQ_STATUS(adev->ee));
for (i = 0; i < ADM_MAX_CHANNELS; i++) {
struct adm_chan *achan = &adev->channels[i];
u32 status, result;
if (srcs & BIT(i)) {
status = readl_relaxed(adev->regs +
ADM_CH_STATUS_SD(i, adev->ee));
/* if no result present, skip */
if (!(status & ADM_CH_STATUS_VALID))
continue;
result = readl_relaxed(adev->regs +
ADM_CH_RSLT(i, adev->ee));
/* no valid results, skip */
if (!(result & ADM_CH_RSLT_VALID))
continue;
/* flag error if transaction was flushed or failed */
if (result & (ADM_CH_RSLT_ERR | ADM_CH_RSLT_FLUSH))
achan->error = 1;
spin_lock_irqsave(&achan->vc.lock, flags);
async_desc = achan->curr_txd;
achan->curr_txd = NULL;
if (async_desc) {
vchan_cookie_complete(&async_desc->vd);
/* kick off next DMA */
adm_start_dma(achan);
}
spin_unlock_irqrestore(&achan->vc.lock, flags);
}
}
return IRQ_HANDLED;
}
/**
* adm_tx_status - returns status of transaction
* @chan: dma channel
* @cookie: transaction cookie
* @txstate: DMA transaction state
*
* Return status of dma transaction
*/
static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct adm_chan *achan = to_adm_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
size_t residue = 0;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&achan->vc.lock, flags);
vd = vchan_find_desc(&achan->vc, cookie);
if (vd)
residue = container_of(vd, struct adm_async_desc, vd)->length;
spin_unlock_irqrestore(&achan->vc.lock, flags);
/*
* residue is either the full length if it is in the issued list, or 0
* if it is in progress. We have no reliable way of determining
* anything inbetween
*/
dma_set_residue(txstate, residue);
if (achan->error)
return DMA_ERROR;
return ret;
}
/**
* adm_issue_pending - starts pending transactions
* @chan: dma channel
*
* Issues all pending transactions and starts DMA
*/
static void adm_issue_pending(struct dma_chan *chan)
{
struct adm_chan *achan = to_adm_chan(chan);
unsigned long flags;
spin_lock_irqsave(&achan->vc.lock, flags);
if (vchan_issue_pending(&achan->vc) && !achan->curr_txd)
adm_start_dma(achan);
spin_unlock_irqrestore(&achan->vc.lock, flags);
}
/**
* adm_dma_free_desc - free descriptor memory
* @vd: virtual descriptor
*
*/
static void adm_dma_free_desc(struct virt_dma_desc *vd)
{
struct adm_async_desc *async_desc = container_of(vd,
struct adm_async_desc, vd);
dma_unmap_single(async_desc->adev->dev, async_desc->dma_addr,
async_desc->dma_len, DMA_TO_DEVICE);
kfree(async_desc->cpl);
kfree(async_desc);
}
static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan,
u32 index)
{
achan->id = index;
achan->adev = adev;
vchan_init(&achan->vc, &adev->common);
achan->vc.desc_free = adm_dma_free_desc;
}
/**
* adm_dma_xlate
* @dma_spec: pointer to DMA specifier as found in the device tree
* @ofdma: pointer to DMA controller data
*
* This can use either 1-cell or 2-cell formats, the first cell
* identifies the slave device, while the optional second cell
* contains the crci value.
*
* Returns pointer to appropriate dma channel on success or NULL on error.
*/
static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dma_device *dev = ofdma->of_dma_data;
struct dma_chan *chan, *candidate = NULL;
struct adm_chan *achan;
if (!dev || dma_spec->args_count > 2)
return NULL;
list_for_each_entry(chan, &dev->channels, device_node)
if (chan->chan_id == dma_spec->args[0]) {
candidate = chan;
break;
}
if (!candidate)
return NULL;
achan = to_adm_chan(candidate);
if (dma_spec->args_count == 2)
achan->crci = dma_spec->args[1];
else
achan->crci = 0;
return dma_get_slave_channel(candidate);
}
static int adm_dma_probe(struct platform_device *pdev)
{
struct adm_device *adev;
int ret;
u32 i;
adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
if (!adev)
return -ENOMEM;
adev->dev = &pdev->dev;
adev->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(adev->regs))
return PTR_ERR(adev->regs);
adev->irq = platform_get_irq(pdev, 0);
if (adev->irq < 0)
return adev->irq;
ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &adev->ee);
if (ret) {
dev_err(adev->dev, "Execution environment unspecified\n");
return ret;
}
adev->core_clk = devm_clk_get(adev->dev, "core");
if (IS_ERR(adev->core_clk))
return PTR_ERR(adev->core_clk);
adev->iface_clk = devm_clk_get(adev->dev, "iface");
if (IS_ERR(adev->iface_clk))
return PTR_ERR(adev->iface_clk);
adev->clk_reset = devm_reset_control_get_exclusive(&pdev->dev, "clk");
if (IS_ERR(adev->clk_reset)) {
dev_err(adev->dev, "failed to get ADM0 reset\n");
return PTR_ERR(adev->clk_reset);
}
adev->c0_reset = devm_reset_control_get_exclusive(&pdev->dev, "c0");
if (IS_ERR(adev->c0_reset)) {
dev_err(adev->dev, "failed to get ADM0 C0 reset\n");
return PTR_ERR(adev->c0_reset);
}
adev->c1_reset = devm_reset_control_get_exclusive(&pdev->dev, "c1");
if (IS_ERR(adev->c1_reset)) {
dev_err(adev->dev, "failed to get ADM0 C1 reset\n");
return PTR_ERR(adev->c1_reset);
}
adev->c2_reset = devm_reset_control_get_exclusive(&pdev->dev, "c2");
if (IS_ERR(adev->c2_reset)) {
dev_err(adev->dev, "failed to get ADM0 C2 reset\n");
return PTR_ERR(adev->c2_reset);
}
ret = clk_prepare_enable(adev->core_clk);
if (ret) {
dev_err(adev->dev, "failed to prepare/enable core clock\n");
return ret;
}
ret = clk_prepare_enable(adev->iface_clk);
if (ret) {
dev_err(adev->dev, "failed to prepare/enable iface clock\n");
goto err_disable_core_clk;
}
reset_control_assert(adev->clk_reset);
reset_control_assert(adev->c0_reset);
reset_control_assert(adev->c1_reset);
reset_control_assert(adev->c2_reset);
udelay(2);
reset_control_deassert(adev->clk_reset);
reset_control_deassert(adev->c0_reset);
reset_control_deassert(adev->c1_reset);
reset_control_deassert(adev->c2_reset);
adev->channels = devm_kcalloc(adev->dev, ADM_MAX_CHANNELS,
sizeof(*adev->channels), GFP_KERNEL);
if (!adev->channels) {
ret = -ENOMEM;
goto err_disable_clks;
}
/* allocate and initialize channels */
INIT_LIST_HEAD(&adev->common.channels);
for (i = 0; i < ADM_MAX_CHANNELS; i++)
adm_channel_init(adev, &adev->channels[i], i);
/* reset CRCIs */
for (i = 0; i < 16; i++)
writel(ADM_CRCI_CTL_RST, adev->regs +
ADM_CRCI_CTL(i, adev->ee));
/* configure client interfaces */
writel(ADM_CI_RANGE_START(0x40) | ADM_CI_RANGE_END(0xb0) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(0));
writel(ADM_CI_RANGE_START(0x2a) | ADM_CI_RANGE_END(0x2c) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(1));
writel(ADM_CI_RANGE_START(0x12) | ADM_CI_RANGE_END(0x28) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(2));
writel(ADM_GP_CTL_LP_EN | ADM_GP_CTL_LP_CNT(0xf),
adev->regs + ADM_GP_CTL);
ret = devm_request_irq(adev->dev, adev->irq, adm_dma_irq,
0, "adm_dma", adev);
if (ret)
goto err_disable_clks;
platform_set_drvdata(pdev, adev);
adev->common.dev = adev->dev;
adev->common.dev->dma_parms = &adev->dma_parms;
/* set capabilities */
dma_cap_zero(adev->common.cap_mask);
dma_cap_set(DMA_SLAVE, adev->common.cap_mask);
dma_cap_set(DMA_PRIVATE, adev->common.cap_mask);
/* initialize dmaengine apis */
adev->common.directions = BIT(DMA_DEV_TO_MEM | DMA_MEM_TO_DEV);
adev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
adev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
adev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
adev->common.device_free_chan_resources = adm_free_chan;
adev->common.device_prep_slave_sg = adm_prep_slave_sg;
adev->common.device_issue_pending = adm_issue_pending;
adev->common.device_tx_status = adm_tx_status;
adev->common.device_terminate_all = adm_terminate_all;
adev->common.device_config = adm_slave_config;
ret = dma_async_device_register(&adev->common);
if (ret) {
dev_err(adev->dev, "failed to register dma async device\n");
goto err_disable_clks;
}
ret = of_dma_controller_register(pdev->dev.of_node, adm_dma_xlate,
&adev->common);
if (ret)
goto err_unregister_dma;
return 0;
err_unregister_dma:
dma_async_device_unregister(&adev->common);
err_disable_clks:
clk_disable_unprepare(adev->iface_clk);
err_disable_core_clk:
clk_disable_unprepare(adev->core_clk);
return ret;
}
static int adm_dma_remove(struct platform_device *pdev)
{
struct adm_device *adev = platform_get_drvdata(pdev);
struct adm_chan *achan;
u32 i;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&adev->common);
for (i = 0; i < ADM_MAX_CHANNELS; i++) {
achan = &adev->channels[i];
/* mask IRQs for this channel/EE pair */
writel(0, adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
tasklet_kill(&adev->channels[i].vc.task);
adm_terminate_all(&adev->channels[i].vc.chan);
}
devm_free_irq(adev->dev, adev->irq, adev);
clk_disable_unprepare(adev->core_clk);
clk_disable_unprepare(adev->iface_clk);
return 0;
}
static const struct of_device_id adm_of_match[] = {
{ .compatible = "qcom,adm", },
{}
};
MODULE_DEVICE_TABLE(of, adm_of_match);
static struct platform_driver adm_dma_driver = {
.probe = adm_dma_probe,
.remove = adm_dma_remove,
.driver = {
.name = "adm-dma-engine",
.of_match_table = adm_of_match,
},
};
module_platform_driver(adm_dma_driver);
MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
MODULE_LICENSE("GPL v2");