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Merge branch 'topic/dw' into for-linus

This commit is contained in:
Vinod Koul 2019-03-12 12:03:47 +05:30
parent 5c196f5efa bdcb2c5d5e
commit 278489c2e1
14 changed files with 426 additions and 266 deletions
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2
Documentation/devicetree/bindings/dma/snps-dma.txt
View File

@ -23,8 +23,6 @@ Deprecated properties:
Optional properties:
- is_private: The device channels should be marked as private and not for by the
general purpose DMA channel allocator. False if not passed.
- multi-block: Multi block transfers supported by hardware. Array property with
one cell per channel. 0: not supported, 1 (default): supported.
- snps,dma-protection-control: AHB HPROT[3:1] protection setting.

2
drivers/dma/dw-axi-dmac/dw-axi-dmac.h
View File

@ -75,7 +75,7 @@ struct __packed axi_dma_lli {
__le32 sstat;
__le32 dstat;
__le32 status_lo;
__le32 ststus_hi;
__le32 status_hi;
__le32 reserved_lo;
__le32 reserved_hi;
};

2
drivers/dma/dw/Kconfig
View File

@ -1,3 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
#
# DMA engine configuration for dw
#

2
drivers/dma/dw/Makefile
View File

@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DW_DMAC_CORE) += dw_dmac_core.o
dw_dmac_core-objs := core.o
dw_dmac_core-objs := core.o dw.o idma32.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o
dw_dmac-objs := platform.o

244
drivers/dma/dw/core.c
View File

@ -1,13 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Core driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007-2008 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
* Copyright (C) 2013 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
@ -37,27 +34,6 @@
* support descriptor writeback.
*/
#define DWC_DEFAULT_CTLLO(_chan) ({ \
struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \
struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \
bool _is_slave = is_slave_direction(_dwc->direction); \
u8 _smsize = _is_slave ? _sconfig->src_maxburst : \
DW_DMA_MSIZE_16; \
u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \
DW_DMA_MSIZE_16; \
u8 _dms = (_dwc->direction == DMA_MEM_TO_DEV) ? \
_dwc->dws.p_master : _dwc->dws.m_master; \
u8 _sms = (_dwc->direction == DMA_DEV_TO_MEM) ? \
_dwc->dws.p_master : _dwc->dws.m_master; \
\
(DWC_CTLL_DST_MSIZE(_dmsize) \
| DWC_CTLL_SRC_MSIZE(_smsize) \
| DWC_CTLL_LLP_D_EN \
| DWC_CTLL_LLP_S_EN \
| DWC_CTLL_DMS(_dms) \
| DWC_CTLL_SMS(_sms)); \
})
/* The set of bus widths supported by the DMA controller */
#define DW_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
@ -138,44 +114,6 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
dwc->descs_allocated--;
}
static void dwc_initialize_chan_idma32(struct dw_dma_chan *dwc)
{
u32 cfghi = 0;
u32 cfglo = 0;
/* Set default burst alignment */
cfglo |= IDMA32C_CFGL_DST_BURST_ALIGN | IDMA32C_CFGL_SRC_BURST_ALIGN;
/* Low 4 bits of the request lines */
cfghi |= IDMA32C_CFGH_DST_PER(dwc->dws.dst_id & 0xf);
cfghi |= IDMA32C_CFGH_SRC_PER(dwc->dws.src_id & 0xf);
/* Request line extension (2 bits) */
cfghi |= IDMA32C_CFGH_DST_PER_EXT(dwc->dws.dst_id >> 4 & 0x3);
cfghi |= IDMA32C_CFGH_SRC_PER_EXT(dwc->dws.src_id >> 4 & 0x3);
channel_writel(dwc, CFG_LO, cfglo);
channel_writel(dwc, CFG_HI, cfghi);
}
static void dwc_initialize_chan_dw(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
u32 cfghi = DWC_CFGH_FIFO_MODE;
u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
bool hs_polarity = dwc->dws.hs_polarity;
cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);
cfghi |= DWC_CFGH_PROTCTL(dw->pdata->protctl);
/* Set polarity of handshake interface */
cfglo |= hs_polarity ? DWC_CFGL_HS_DST_POL | DWC_CFGL_HS_SRC_POL : 0;
channel_writel(dwc, CFG_LO, cfglo);
channel_writel(dwc, CFG_HI, cfghi);
}
static void dwc_initialize(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
@ -183,10 +121,7 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
if (test_bit(DW_DMA_IS_INITIALIZED, &dwc->flags))
return;
if (dw->pdata->is_idma32)
dwc_initialize_chan_idma32(dwc);
else
dwc_initialize_chan_dw(dwc);
dw->initialize_chan(dwc);
/* Enable interrupts */
channel_set_bit(dw, MASK.XFER, dwc->mask);
@ -215,37 +150,6 @@ static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
cpu_relax();
}
static u32 bytes2block(struct dw_dma_chan *dwc, size_t bytes,
unsigned int width, size_t *len)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
u32 block;
/* Always in bytes for iDMA 32-bit */
if (dw->pdata->is_idma32)
width = 0;
if ((bytes >> width) > dwc->block_size) {
block = dwc->block_size;
*len = block << width;
} else {
block = bytes >> width;
*len = bytes;
}
return block;
}
static size_t block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
if (dw->pdata->is_idma32)
return IDMA32C_CTLH_BLOCK_TS(block);
return DWC_CTLH_BLOCK_TS(block) << width;
}
/*----------------------------------------------------------------------*/
/* Perform single block transfer */
@ -391,10 +295,11 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
/* Returns how many bytes were already received from source */
static inline u32 dwc_get_sent(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
u32 ctlhi = channel_readl(dwc, CTL_HI);
u32 ctllo = channel_readl(dwc, CTL_LO);
return block2bytes(dwc, ctlhi, ctllo >> 4 & 7);
return dw->block2bytes(dwc, ctlhi, ctllo >> 4 & 7);
}
static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
@ -651,7 +556,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
unsigned int src_width;
unsigned int dst_width;
unsigned int data_width = dw->pdata->data_width[m_master];
u32 ctllo;
u32 ctllo, ctlhi;
u8 lms = DWC_LLP_LMS(m_master);
dev_vdbg(chan2dev(chan),
@ -667,7 +572,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
src_width = dst_width = __ffs(data_width | src | dest | len);
ctllo = DWC_DEFAULT_CTLLO(chan)
ctllo = dw->prepare_ctllo(dwc)
| DWC_CTLL_DST_WIDTH(dst_width)
| DWC_CTLL_SRC_WIDTH(src_width)
| DWC_CTLL_DST_INC
@ -680,10 +585,12 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (!desc)
goto err_desc_get;
ctlhi = dw->bytes2block(dwc, len - offset, src_width, &xfer_count);
lli_write(desc, sar, src + offset);
lli_write(desc, dar, dest + offset);
lli_write(desc, ctllo, ctllo);
lli_write(desc, ctlhi, bytes2block(dwc, len - offset, src_width, &xfer_count));
lli_write(desc, ctlhi, ctlhi);
desc->len = xfer_count;
if (!first) {
@ -721,7 +628,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
struct dw_desc *prev;
struct dw_desc *first;
u32 ctllo;
u32 ctllo, ctlhi;
u8 m_master = dwc->dws.m_master;
u8 lms = DWC_LLP_LMS(m_master);
dma_addr_t reg;
@ -745,10 +652,10 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
case DMA_MEM_TO_DEV:
reg_width = __ffs(sconfig->dst_addr_width);
reg = sconfig->dst_addr;
ctllo = (DWC_DEFAULT_CTLLO(chan)
ctllo = dw->prepare_ctllo(dwc)
| DWC_CTLL_DST_WIDTH(reg_width)
| DWC_CTLL_DST_FIX
| DWC_CTLL_SRC_INC);
| DWC_CTLL_SRC_INC;
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
DWC_CTLL_FC(DW_DMA_FC_D_M2P);
@ -768,9 +675,11 @@ slave_sg_todev_fill_desc:
if (!desc)
goto err_desc_get;
ctlhi = dw->bytes2block(dwc, len, mem_width, &dlen);
lli_write(desc, sar, mem);
lli_write(desc, dar, reg);
lli_write(desc, ctlhi, bytes2block(dwc, len, mem_width, &dlen));
lli_write(desc, ctlhi, ctlhi);
lli_write(desc, ctllo, ctllo | DWC_CTLL_SRC_WIDTH(mem_width));
desc->len = dlen;
@ -793,10 +702,10 @@ slave_sg_todev_fill_desc:
case DMA_DEV_TO_MEM:
reg_width = __ffs(sconfig->src_addr_width);
reg = sconfig->src_addr;
ctllo = (DWC_DEFAULT_CTLLO(chan)
ctllo = dw->prepare_ctllo(dwc)
| DWC_CTLL_SRC_WIDTH(reg_width)
| DWC_CTLL_DST_INC
| DWC_CTLL_SRC_FIX);
| DWC_CTLL_SRC_FIX;
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
DWC_CTLL_FC(DW_DMA_FC_D_P2M);
@ -814,9 +723,11 @@ slave_sg_fromdev_fill_desc:
if (!desc)
goto err_desc_get;
ctlhi = dw->bytes2block(dwc, len, reg_width, &dlen);
lli_write(desc, sar, reg);
lli_write(desc, dar, mem);
lli_write(desc, ctlhi, bytes2block(dwc, len, reg_width, &dlen));
lli_write(desc, ctlhi, ctlhi);
mem_width = __ffs(data_width | mem | dlen);
lli_write(desc, ctllo, ctllo | DWC_CTLL_DST_WIDTH(mem_width));
desc->len = dlen;
@ -876,22 +787,12 @@ EXPORT_SYMBOL_GPL(dw_dma_filter);
static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dma_slave_config *sc = &dwc->dma_sconfig;
struct dw_dma *dw = to_dw_dma(chan->device);
/*
* Fix sconfig's burst size according to dw_dmac. We need to convert
* them as:
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
*
* NOTE: burst size 2 is not supported by DesignWare controller.
* iDMA 32-bit supports it.
*/
u32 s = dw->pdata->is_idma32 ? 1 : 2;
memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
sc->src_maxburst = sc->src_maxburst > 1 ? fls(sc->src_maxburst) - s : 0;
sc->dst_maxburst = sc->dst_maxburst > 1 ? fls(sc->dst_maxburst) - s : 0;
dw->encode_maxburst(dwc, &dwc->dma_sconfig.src_maxburst);
dw->encode_maxburst(dwc, &dwc->dma_sconfig.dst_maxburst);
return 0;
}
@ -900,16 +801,9 @@ static void dwc_chan_pause(struct dw_dma_chan *dwc, bool drain)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
unsigned int count = 20; /* timeout iterations */
u32 cfglo;
cfglo = channel_readl(dwc, CFG_LO);
if (dw->pdata->is_idma32) {
if (drain)
cfglo |= IDMA32C_CFGL_CH_DRAIN;
else
cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
}
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
dw->suspend_chan(dwc, drain);
while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--)
udelay(2);
@ -928,11 +822,11 @@ static int dwc_pause(struct dma_chan *chan)
return 0;
}
static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
static inline void dwc_chan_resume(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
dw->resume_chan(dwc, drain);
clear_bit(DW_DMA_IS_PAUSED, &dwc->flags);
}
@ -945,7 +839,7 @@ static int dwc_resume(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);
if (test_bit(DW_DMA_IS_PAUSED, &dwc->flags))
dwc_chan_resume(dwc);
dwc_chan_resume(dwc, false);
spin_unlock_irqrestore(&dwc->lock, flags);
@ -968,7 +862,7 @@ static int dwc_terminate_all(struct dma_chan *chan)
dwc_chan_disable(dw, dwc);
dwc_chan_resume(dwc);
dwc_chan_resume(dwc, true);
/* active_list entries will end up before queued entries */
list_splice_init(&dwc->queue, &list);
@ -1058,33 +952,7 @@ static void dwc_issue_pending(struct dma_chan *chan)
/*----------------------------------------------------------------------*/
/*
* Program FIFO size of channels.
*
* By default full FIFO (512 bytes) is assigned to channel 0. Here we
* slice FIFO on equal parts between channels.
*/
static void idma32_fifo_partition(struct dw_dma *dw)
{
u64 value = IDMA32C_FP_PSIZE_CH0(64) | IDMA32C_FP_PSIZE_CH1(64) |
IDMA32C_FP_UPDATE;
u64 fifo_partition = 0;
if (!dw->pdata->is_idma32)
return;
/* Fill FIFO_PARTITION low bits (Channels 0..1, 4..5) */
fifo_partition |= value << 0;
/* Fill FIFO_PARTITION high bits (Channels 2..3, 6..7) */
fifo_partition |= value << 32;
/* Program FIFO Partition registers - 64 bytes per channel */
idma32_writeq(dw, FIFO_PARTITION1, fifo_partition);
idma32_writeq(dw, FIFO_PARTITION0, fifo_partition);
}
static void dw_dma_off(struct dw_dma *dw)
void do_dw_dma_off(struct dw_dma *dw)
{
unsigned int i;
@ -1103,7 +971,7 @@ static void dw_dma_off(struct dw_dma *dw)
clear_bit(DW_DMA_IS_INITIALIZED, &dw->chan[i].flags);
}
static void dw_dma_on(struct dw_dma *dw)
void do_dw_dma_on(struct dw_dma *dw)
{
dma_writel(dw, CFG, DW_CFG_DMA_EN);
}
@ -1139,7 +1007,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
/* Enable controller here if needed */
if (!dw->in_use)
dw_dma_on(dw);
do_dw_dma_on(dw);
dw->in_use |= dwc->mask;
return 0;
@ -1176,30 +1044,25 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
/* Disable controller in case it was a last user */
dw->in_use &= ~dwc->mask;
if (!dw->in_use)
dw_dma_off(dw);
do_dw_dma_off(dw);
dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
}
int dw_dma_probe(struct dw_dma_chip *chip)
int do_dma_probe(struct dw_dma_chip *chip)
{
struct dw_dma *dw = chip->dw;
struct dw_dma_platform_data *pdata;
struct dw_dma *dw;
bool autocfg = false;
unsigned int dw_params;
unsigned int i;
int err;
dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
dw->pdata = devm_kzalloc(chip->dev, sizeof(*dw->pdata), GFP_KERNEL);
if (!dw->pdata)
return -ENOMEM;
dw->regs = chip->regs;
chip->dw = dw;
pm_runtime_get_sync(chip->dev);
@ -1226,8 +1089,6 @@ int dw_dma_probe(struct dw_dma_chip *chip)
pdata->block_size = dma_readl(dw, MAX_BLK_SIZE);
/* Fill platform data with the default values */
pdata->is_private = true;
pdata->is_memcpy = true;
pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
} else if (chip->pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
@ -1251,15 +1112,10 @@ int dw_dma_probe(struct dw_dma_chip *chip)
dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
/* Force dma off, just in case */
dw_dma_off(dw);
idma32_fifo_partition(dw);
dw->disable(dw);
/* Device and instance ID for IRQ and DMA pool */
if (pdata->is_idma32)
snprintf(dw->name, sizeof(dw->name), "idma32:dmac%d", chip->id);
else
snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", chip->id);
dw->set_device_name(dw, chip->id);
/* Create a pool of consistent memory blocks for hardware descriptors */
dw->desc_pool = dmam_pool_create(dw->name, chip->dev,
@ -1339,10 +1195,8 @@ int dw_dma_probe(struct dw_dma_chip *chip)
/* Set capabilities */
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
if (pdata->is_private)
dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
if (pdata->is_memcpy)
dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
dw->dma.dev = chip->dev;
dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
@ -1383,16 +1237,15 @@ err_pdata:
pm_runtime_put_sync_suspend(chip->dev);
return err;
}
EXPORT_SYMBOL_GPL(dw_dma_probe);
int dw_dma_remove(struct dw_dma_chip *chip)
int do_dma_remove(struct dw_dma_chip *chip)
{
struct dw_dma *dw = chip->dw;
struct dw_dma_chan *dwc, *_dwc;
pm_runtime_get_sync(chip->dev);
dw_dma_off(dw);
do_dw_dma_off(dw);
dma_async_device_unregister(&dw->dma);
free_irq(chip->irq, dw);
@ -1407,27 +1260,24 @@ int dw_dma_remove(struct dw_dma_chip *chip)
pm_runtime_put_sync_suspend(chip->dev);
return 0;
}
EXPORT_SYMBOL_GPL(dw_dma_remove);
int dw_dma_disable(struct dw_dma_chip *chip)
int do_dw_dma_disable(struct dw_dma_chip *chip)
{
struct dw_dma *dw = chip->dw;
dw_dma_off(dw);
dw->disable(dw);
return 0;
}
EXPORT_SYMBOL_GPL(dw_dma_disable);
EXPORT_SYMBOL_GPL(do_dw_dma_disable);
int dw_dma_enable(struct dw_dma_chip *chip)
int do_dw_dma_enable(struct dw_dma_chip *chip)
{
struct dw_dma *dw = chip->dw;
idma32_fifo_partition(dw);
dw_dma_on(dw);
dw->enable(dw);
return 0;
}
EXPORT_SYMBOL_GPL(dw_dma_enable);
EXPORT_SYMBOL_GPL(do_dw_dma_enable);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller core driver");

138
drivers/dma/dw/dw.c Normal file
View File

@ -0,0 +1,138 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2007-2008 Atmel Corporation
// Copyright (C) 2010-2011 ST Microelectronics
// Copyright (C) 2013,2018 Intel Corporation
#include <linux/bitops.h>
#include <linux/dmaengine.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "internal.h"
static void dw_dma_initialize_chan(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
u32 cfghi = DWC_CFGH_FIFO_MODE;
u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
bool hs_polarity = dwc->dws.hs_polarity;
cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);
cfghi |= DWC_CFGH_PROTCTL(dw->pdata->protctl);
/* Set polarity of handshake interface */
cfglo |= hs_polarity ? DWC_CFGL_HS_DST_POL | DWC_CFGL_HS_SRC_POL : 0;
channel_writel(dwc, CFG_LO, cfglo);
channel_writel(dwc, CFG_HI, cfghi);
}
static void dw_dma_suspend_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
static void dw_dma_resume_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
}
static u32 dw_dma_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
u32 block;
if ((bytes >> width) > dwc->block_size) {
block = dwc->block_size;
*len = dwc->block_size << width;
} else {
block = bytes >> width;
*len = bytes;
}
return block;
}
static size_t dw_dma_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width)
{
return DWC_CTLH_BLOCK_TS(block) << width;
}
static u32 dw_dma_prepare_ctllo(struct dw_dma_chan *dwc)
{
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
bool is_slave = is_slave_direction(dwc->direction);
u8 smsize = is_slave ? sconfig->src_maxburst : DW_DMA_MSIZE_16;
u8 dmsize = is_slave ? sconfig->dst_maxburst : DW_DMA_MSIZE_16;
u8 p_master = dwc->dws.p_master;
u8 m_master = dwc->dws.m_master;
u8 dms = (dwc->direction == DMA_MEM_TO_DEV) ? p_master : m_master;
u8 sms = (dwc->direction == DMA_DEV_TO_MEM) ? p_master : m_master;
return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN |
DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize) |
DWC_CTLL_DMS(dms) | DWC_CTLL_SMS(sms);
}
static void dw_dma_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst)
{
/*
* Fix burst size according to dw_dmac. We need to convert them as:
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
*/
*maxburst = *maxburst > 1 ? fls(*maxburst) - 2 : 0;
}
static void dw_dma_set_device_name(struct dw_dma *dw, int id)
{
snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", id);
}
static void dw_dma_disable(struct dw_dma *dw)
{
do_dw_dma_off(dw);
}
static void dw_dma_enable(struct dw_dma *dw)
{
do_dw_dma_on(dw);
}
int dw_dma_probe(struct dw_dma_chip *chip)
{
struct dw_dma *dw;
dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
/* Channel operations */
dw->initialize_chan = dw_dma_initialize_chan;
dw->suspend_chan = dw_dma_suspend_chan;
dw->resume_chan = dw_dma_resume_chan;
dw->prepare_ctllo = dw_dma_prepare_ctllo;
dw->encode_maxburst = dw_dma_encode_maxburst;
dw->bytes2block = dw_dma_bytes2block;
dw->block2bytes = dw_dma_block2bytes;
/* Device operations */
dw->set_device_name = dw_dma_set_device_name;
dw->disable = dw_dma_disable;
dw->enable = dw_dma_enable;
chip->dw = dw;
return do_dma_probe(chip);
}
EXPORT_SYMBOL_GPL(dw_dma_probe);
int dw_dma_remove(struct dw_dma_chip *chip)
{
return do_dma_remove(chip);
}
EXPORT_SYMBOL_GPL(dw_dma_remove);

160
drivers/dma/dw/idma32.c Normal file
View File

@ -0,0 +1,160 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2013,2018 Intel Corporation
#include <linux/bitops.h>
#include <linux/dmaengine.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "internal.h"
static void idma32_initialize_chan(struct dw_dma_chan *dwc)
{
u32 cfghi = 0;
u32 cfglo = 0;
/* Set default burst alignment */
cfglo |= IDMA32C_CFGL_DST_BURST_ALIGN | IDMA32C_CFGL_SRC_BURST_ALIGN;
/* Low 4 bits of the request lines */
cfghi |= IDMA32C_CFGH_DST_PER(dwc->dws.dst_id & 0xf);
cfghi |= IDMA32C_CFGH_SRC_PER(dwc->dws.src_id & 0xf);
/* Request line extension (2 bits) */
cfghi |= IDMA32C_CFGH_DST_PER_EXT(dwc->dws.dst_id >> 4 & 0x3);
cfghi |= IDMA32C_CFGH_SRC_PER_EXT(dwc->dws.src_id >> 4 & 0x3);
channel_writel(dwc, CFG_LO, cfglo);
channel_writel(dwc, CFG_HI, cfghi);
}
static void idma32_suspend_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
if (drain)
cfglo |= IDMA32C_CFGL_CH_DRAIN;
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
static void idma32_resume_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
if (drain)
cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
}
static u32 idma32_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
u32 block;
if (bytes > dwc->block_size) {
block = dwc->block_size;
*len = dwc->block_size;
} else {
block = bytes;
*len = bytes;
}
return block;
}
static size_t idma32_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width)
{
return IDMA32C_CTLH_BLOCK_TS(block);
}
static u32 idma32_prepare_ctllo(struct dw_dma_chan *dwc)
{
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
bool is_slave = is_slave_direction(dwc->direction);
u8 smsize = is_slave ? sconfig->src_maxburst : IDMA32_MSIZE_8;
u8 dmsize = is_slave ? sconfig->dst_maxburst : IDMA32_MSIZE_8;
return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN |
DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize);
}
static void idma32_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst)
{
*maxburst = *maxburst > 1 ? fls(*maxburst) - 1 : 0;
}
static void idma32_set_device_name(struct dw_dma *dw, int id)
{
snprintf(dw->name, sizeof(dw->name), "idma32:dmac%d", id);
}
/*
* Program FIFO size of channels.
*
* By default full FIFO (512 bytes) is assigned to channel 0. Here we
* slice FIFO on equal parts between channels.
*/
static void idma32_fifo_partition(struct dw_dma *dw)
{
u64 value = IDMA32C_FP_PSIZE_CH0(64) | IDMA32C_FP_PSIZE_CH1(64) |
IDMA32C_FP_UPDATE;
u64 fifo_partition = 0;
/* Fill FIFO_PARTITION low bits (Channels 0..1, 4..5) */
fifo_partition |= value << 0;
/* Fill FIFO_PARTITION high bits (Channels 2..3, 6..7) */
fifo_partition |= value << 32;
/* Program FIFO Partition registers - 64 bytes per channel */
idma32_writeq(dw, FIFO_PARTITION1, fifo_partition);
idma32_writeq(dw, FIFO_PARTITION0, fifo_partition);
}
static void idma32_disable(struct dw_dma *dw)
{
do_dw_dma_off(dw);
idma32_fifo_partition(dw);
}
static void idma32_enable(struct dw_dma *dw)
{
idma32_fifo_partition(dw);
do_dw_dma_on(dw);
}
int idma32_dma_probe(struct dw_dma_chip *chip)
{
struct dw_dma *dw;
dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
/* Channel operations */
dw->initialize_chan = idma32_initialize_chan;
dw->suspend_chan = idma32_suspend_chan;
dw->resume_chan = idma32_resume_chan;
dw->prepare_ctllo = idma32_prepare_ctllo;
dw->encode_maxburst = idma32_encode_maxburst;
dw->bytes2block = idma32_bytes2block;
dw->block2bytes = idma32_block2bytes;
/* Device operations */
dw->set_device_name = idma32_set_device_name;
dw->disable = idma32_disable;
dw->enable = idma32_enable;
chip->dw = dw;
return do_dma_probe(chip);
}
EXPORT_SYMBOL_GPL(idma32_dma_probe);
int idma32_dma_remove(struct dw_dma_chip *chip)
{
return do_dma_remove(chip);
}
EXPORT_SYMBOL_GPL(idma32_dma_remove);

15
drivers/dma/dw/internal.h
View File

@ -1,11 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2013 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _DMA_DW_INTERNAL_H
@ -15,8 +12,14 @@
#include "regs.h"
int dw_dma_disable(struct dw_dma_chip *chip);
int dw_dma_enable(struct dw_dma_chip *chip);
int do_dma_probe(struct dw_dma_chip *chip);
int do_dma_remove(struct dw_dma_chip *chip);
void do_dw_dma_on(struct dw_dma *dw);
void do_dw_dma_off(struct dw_dma *dw);
int do_dw_dma_disable(struct dw_dma_chip *chip);
int do_dw_dma_enable(struct dw_dma_chip *chip);
extern bool dw_dma_filter(struct dma_chan *chan, void *param);

53
drivers/dma/dw/pci.c
View File

@ -1,12 +1,9 @@
// SPDX-License-Identifier: GPL-2.0
/*
* PCI driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2013 Intel Corporation
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
@ -15,21 +12,33 @@
#include "internal.h"
static struct dw_dma_platform_data mrfld_pdata = {
struct dw_dma_pci_data {
const struct dw_dma_platform_data *pdata;
int (*probe)(struct dw_dma_chip *chip);
};
static const struct dw_dma_pci_data dw_pci_data = {
.probe = dw_dma_probe,
};
static const struct dw_dma_platform_data idma32_pdata = {
.nr_channels = 8,
.is_private = true,
.is_memcpy = true,
.is_idma32 = true,
.chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
.chan_priority = CHAN_PRIORITY_ASCENDING,
.block_size = 131071,
.nr_masters = 1,
.data_width = {4},
.multi_block = {1, 1, 1, 1, 1, 1, 1, 1},
};
static const struct dw_dma_pci_data idma32_pci_data = {
.pdata = &idma32_pdata,
.probe = idma32_dma_probe,
};
static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
{
const struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
const struct dw_dma_pci_data *data = (void *)pid->driver_data;
struct dw_dma_chip *chip;
int ret;
@ -62,9 +71,9 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
chip->id = pdev->devfn;
chip->regs = pcim_iomap_table(pdev)[0];
chip->irq = pdev->irq;
chip->pdata = pdata;
chip->pdata = data->pdata;
ret = dw_dma_probe(chip);
ret = data->probe(chip);
if (ret)
return ret;
@ -90,7 +99,7 @@ static int dw_pci_suspend_late(struct device *dev)
struct pci_dev *pci = to_pci_dev(dev);
struct dw_dma_chip *chip = pci_get_drvdata(pci);
return dw_dma_disable(chip);
return do_dw_dma_disable(chip);
};
static int dw_pci_resume_early(struct device *dev)
@ -98,7 +107,7 @@ static int dw_pci_resume_early(struct device *dev)
struct pci_dev *pci = to_pci_dev(dev);
struct dw_dma_chip *chip = pci_get_drvdata(pci);
return dw_dma_enable(chip);
return do_dw_dma_enable(chip);
};
#endif /* CONFIG_PM_SLEEP */
@ -109,24 +118,24 @@ static const struct dev_pm_ops dw_pci_dev_pm_ops = {
static const struct pci_device_id dw_pci_id_table[] = {
/* Medfield (GPDMA) */
{ PCI_VDEVICE(INTEL, 0x0827) },
{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_data },
/* BayTrail */
{ PCI_VDEVICE(INTEL, 0x0f06) },
{ PCI_VDEVICE(INTEL, 0x0f40) },
{ PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_data },
{ PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_data },
/* Merrifield iDMA 32-bit (GPDMA) */
{ PCI_VDEVICE(INTEL, 0x11a2), (kernel_ulong_t)&mrfld_pdata },
/* Merrifield */
{ PCI_VDEVICE(INTEL, 0x11a2), (kernel_ulong_t)&idma32_pci_data },
/* Braswell */
{ PCI_VDEVICE(INTEL, 0x2286) },
{ PCI_VDEVICE(INTEL, 0x22c0) },
{ PCI_VDEVICE(INTEL, 0x2286), (kernel_ulong_t)&dw_pci_data },
{ PCI_VDEVICE(INTEL, 0x22c0), (kernel_ulong_t)&dw_pci_data },
/* Haswell */
{ PCI_VDEVICE(INTEL, 0x9c60) },
{ PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_pci_data },
/* Broadwell */
{ PCI_VDEVICE(INTEL, 0x9ce0) },
{ PCI_VDEVICE(INTEL, 0x9ce0), (kernel_ulong_t)&dw_pci_data },
{ }
};

22
drivers/dma/dw/platform.c
View File

@ -1,3 +1,4 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Platform driver for the Synopsys DesignWare DMA Controller
*
@ -6,10 +7,6 @@
* Copyright (C) 2013 Intel Corporation
*
* Some parts of this driver are derived from the original dw_dmac.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
@ -128,15 +125,6 @@ dw_dma_parse_dt(struct platform_device *pdev)
pdata->nr_masters = nr_masters;
pdata->nr_channels = nr_channels;
if (of_property_read_bool(np, "is_private"))
pdata->is_private = true;
/*
* All known devices, which use DT for configuration, support
* memory-to-memory transfers. So enable it by default.
*/
pdata->is_memcpy = true;
if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
pdata->chan_allocation_order = (unsigned char)tmp;
@ -264,7 +252,7 @@ static void dw_shutdown(struct platform_device *pdev)
struct dw_dma_chip *chip = platform_get_drvdata(pdev);
/*
* We have to call dw_dma_disable() to stop any ongoing transfer. On
* We have to call do_dw_dma_disable() to stop any ongoing transfer. On
* some platforms we can't do that since DMA device is powered off.
* Moreover we have no possibility to check if the platform is affected
* or not. That's why we call pm_runtime_get_sync() / pm_runtime_put()
@ -273,7 +261,7 @@ static void dw_shutdown(struct platform_device *pdev)
* used by the driver.
*/
pm_runtime_get_sync(chip->dev);
dw_dma_disable(chip);
do_dw_dma_disable(chip);
pm_runtime_put_sync_suspend(chip->dev);
clk_disable_unprepare(chip->clk);
@ -303,7 +291,7 @@ static int dw_suspend_late(struct device *dev)
{
struct dw_dma_chip *chip = dev_get_drvdata(dev);
dw_dma_disable(chip);
do_dw_dma_disable(chip);
clk_disable_unprepare(chip->clk);
return 0;
@ -318,7 +306,7 @@ static int dw_resume_early(struct device *dev)
if (ret)
return ret;
return dw_dma_enable(chip);
return do_dw_dma_enable(chip);
}
#endif /* CONFIG_PM_SLEEP */

30
drivers/dma/dw/regs.h
View File

@ -1,13 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for the Synopsys DesignWare AHB DMA Controller
*
* Copyright (C) 2005-2007 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
* Copyright (C) 2016 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
@ -222,6 +219,16 @@ enum dw_dma_msize {
/* iDMA 32-bit support */
/* bursts size */
enum idma32_msize {
IDMA32_MSIZE_1,
IDMA32_MSIZE_2,
IDMA32_MSIZE_4,
IDMA32_MSIZE_8,
IDMA32_MSIZE_16,
IDMA32_MSIZE_32,
};
/* Bitfields in CTL_HI */
#define IDMA32C_CTLH_BLOCK_TS_MASK GENMASK(16, 0)
#define IDMA32C_CTLH_BLOCK_TS(x) ((x) & IDMA32C_CTLH_BLOCK_TS_MASK)
@ -312,6 +319,21 @@ struct dw_dma {
u8 all_chan_mask;
u8 in_use;
/* Channel operations */
void (*initialize_chan)(struct dw_dma_chan *dwc);
void (*suspend_chan)(struct dw_dma_chan *dwc, bool drain);
void (*resume_chan)(struct dw_dma_chan *dwc, bool drain);
u32 (*prepare_ctllo)(struct dw_dma_chan *dwc);
void (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst);
u32 (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes,
unsigned int width, size_t *len);
size_t (*block2bytes)(struct dw_dma_chan *dwc, u32 block, u32 width);
/* Device operations */
void (*set_device_name)(struct dw_dma *dw, int id);
void (*disable)(struct dw_dma *dw);
void (*enable)(struct dw_dma *dw);
/* platform data */
struct dw_dma_platform_data *pdata;
};

1
drivers/tty/serial/8250/8250_lpss.c
View File

@ -153,7 +153,6 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
#ifdef CONFIG_SERIAL_8250_DMA
static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
.nr_channels = 2,
.is_private = true,
.chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
.chan_priority = CHAN_PRIORITY_ASCENDING,
.block_size = 4095,

9
include/linux/dma/dw.h
View File

@ -1,13 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
* Copyright (C) 2014 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _DMA_DW_H
#define _DMA_DW_H
@ -45,9 +42,13 @@ struct dw_dma_chip {
#if IS_ENABLED(CONFIG_DW_DMAC_CORE)
int dw_dma_probe(struct dw_dma_chip *chip);
int dw_dma_remove(struct dw_dma_chip *chip);
int idma32_dma_probe(struct dw_dma_chip *chip);
int idma32_dma_remove(struct dw_dma_chip *chip);
#else
static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
static inline int idma32_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
static inline int idma32_dma_remove(struct dw_dma_chip *chip) { return 0; }
#endif /* CONFIG_DW_DMAC_CORE */
#endif /* _DMA_DW_H */

12
include/linux/platform_data/dma-dw.h
View File

@ -1,12 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _PLATFORM_DATA_DMA_DW_H
#define _PLATFORM_DATA_DMA_DW_H
@ -38,10 +35,6 @@ struct dw_dma_slave {
/**
* struct dw_dma_platform_data - Controller configuration parameters
* @nr_channels: Number of channels supported by hardware (max 8)
* @is_private: The device channels should be marked as private and not for
* by the general purpose DMA channel allocator.
* @is_memcpy: The device channels do support memory-to-memory transfers.
* @is_idma32: The type of the DMA controller is iDMA32
* @chan_allocation_order: Allocate channels starting from 0 or 7
* @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
* @block_size: Maximum block size supported by the controller
@ -53,9 +46,6 @@ struct dw_dma_slave {
*/
struct dw_dma_platform_data {
unsigned int nr_channels;
bool is_private;
bool is_memcpy;
bool is_idma32;
#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
unsigned char chan_allocation_order;