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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

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* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (30 commits)
  DMAENGINE: at_hdmac: locking fixlet
  DMAENGINE: pch_dma: kill another usage of __raw_{read|write}l
  dma: dmatest: fix potential sign bug
  ioat2: catch and recover from broken vtd configurations v6
  DMAENGINE: add runtime slave control to COH 901 318 v3
  DMAENGINE: add runtime slave config to DMA40 v3
  DMAENGINE: generic slave channel control v3
  dmaengine: Driver for Topcliff PCH DMA controller
  intel_mid: Add Mrst & Mfld DMA Drivers
  drivers/dma: Eliminate a NULL pointer dereference
  dma/timb_dma: compile warning on 32 bit
  DMAENGINE: ste_dma40: support older silicon
  DMAENGINE: ste_dma40: support disabling physical channels
  DMAENGINE: ste_dma40: no disabled phy channels on ux500
  DMAENGINE: ste_dma40: fix suspend bug
  DMAENGINE: ste_dma40: add DB8500 memcpy channels
  DMAENGINE: ste_dma40: no flow control on memcpy
  DMAENGINE: ste_dma40: arch updates for LCLA and LCPA
  DMAENGINE: ste_dma40: allocate LCLA dynamically
  DMAENGINE: ste_dma40: no premature stop
  ...

Fix up trivial conflicts in arch/arm/mach-ux500/devices-db8500.c
This commit is contained in:
Linus Torvalds 2010-08-09 21:00:07 -07:00
commit dcded10f6d
23 changed files with 3391 additions and 383 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
arch/arm/mach-ux500/devices-db8500.c
View file

@ -119,20 +119,15 @@ static struct resource dma40_resources[] = {
},
[1] = {
.start = U8500_DMA_LCPA_BASE,
.end = U8500_DMA_LCPA_BASE + SZ_4K - 1,
.end = U8500_DMA_LCPA_BASE + 2 * SZ_1K - 1,
.flags = IORESOURCE_MEM,
.name = "lcpa",
},
[2] = {
.start = U8500_DMA_LCLA_BASE,
.end = U8500_DMA_LCLA_BASE + 16 * 1024 - 1,
.flags = IORESOURCE_MEM,
.name = "lcla",
},
[3] = {
.start = IRQ_DB8500_DMA,
.end = IRQ_DB8500_DMA,
.flags = IORESOURCE_IRQ}
.flags = IORESOURCE_IRQ,
}
};
/* Default configuration for physcial memcpy */
@ -145,11 +140,12 @@ struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
.src_info.endianess = STEDMA40_LITTLE_ENDIAN,
.src_info.data_width = STEDMA40_BYTE_WIDTH,
.src_info.psize = STEDMA40_PSIZE_PHY_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.endianess = STEDMA40_LITTLE_ENDIAN,
.dst_info.data_width = STEDMA40_BYTE_WIDTH,
.dst_info.psize = STEDMA40_PSIZE_PHY_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/* Default configuration for logical memcpy */
struct stedma40_chan_cfg dma40_memcpy_conf_log = {
@ -162,11 +158,12 @@ struct stedma40_chan_cfg dma40_memcpy_conf_log = {
.src_info.endianess = STEDMA40_LITTLE_ENDIAN,
.src_info.data_width = STEDMA40_BYTE_WIDTH,
.src_info.psize = STEDMA40_PSIZE_LOG_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.endianess = STEDMA40_LITTLE_ENDIAN,
.dst_info.data_width = STEDMA40_BYTE_WIDTH,
.dst_info.psize = STEDMA40_PSIZE_LOG_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/*
@ -180,10 +177,12 @@ static const dma_addr_t dma40_rx_map[STEDMA40_NR_DEV];
/* Reserved event lines for memcpy only */
static int dma40_memcpy_event[] = {
STEDMA40_MEMCPY_TX_0,
STEDMA40_MEMCPY_TX_1,
STEDMA40_MEMCPY_TX_2,
STEDMA40_MEMCPY_TX_3,
STEDMA40_MEMCPY_TX_4,
STEDMA40_MEMCPY_TX_5,
};
static struct stedma40_platform_data dma40_plat_data = {
@ -195,6 +194,7 @@ static struct stedma40_platform_data dma40_plat_data = {
.memcpy_conf_phy = &dma40_memcpy_conf_phy,
.memcpy_conf_log = &dma40_memcpy_conf_log,
.llis_per_log = 8,
.disabled_channels = {-1},
};
struct platform_device u8500_dma40_device = {
@ -213,4 +213,6 @@ void dma40_u8500ed_fixup(void)
dma40_plat_data.memcpy_len = 0;
dma40_resources[0].start = U8500_DMA_BASE_ED;
dma40_resources[0].end = U8500_DMA_BASE_ED + SZ_4K - 1;
dma40_resources[1].start = U8500_DMA_LCPA_BASE_ED;
dma40_resources[1].end = U8500_DMA_LCPA_BASE_ED + 2 * SZ_1K - 1;
}

6
arch/arm/mach-ux500/include/mach/db8500-regs.h
View file

@ -15,9 +15,9 @@
#define U8500_ESRAM_BANK2 (U8500_ESRAM_BANK1 + U8500_ESRAM_BANK_SIZE)
#define U8500_ESRAM_BANK3 (U8500_ESRAM_BANK2 + U8500_ESRAM_BANK_SIZE)
#define U8500_ESRAM_BANK4 (U8500_ESRAM_BANK3 + U8500_ESRAM_BANK_SIZE)
/* Use bank 4 for DMA LCLA and LCPA */
#define U8500_DMA_LCLA_BASE U8500_ESRAM_BANK4
#define U8500_DMA_LCPA_BASE (U8500_ESRAM_BANK4 + 0x4000)
/* Use bank 4 for DMA LCPA */
#define U8500_DMA_LCPA_BASE U8500_ESRAM_BANK4
#define U8500_DMA_LCPA_BASE_ED (U8500_ESRAM_BANK4 + 0x4000)
#define U8500_PER3_BASE 0x80000000
#define U8500_STM_BASE 0x80100000

2
arch/arm/mach-ux500/ste-dma40-db8500.h
View file

@ -136,7 +136,7 @@ enum dma_dest_dev_type {
STEDMA40_DEV_CAC1_TX = 48,
STEDMA40_DEV_CAC1_TX_HAC1_TX = 49,
STEDMA40_DEV_HAC1_TX = 50,
STEDMA40_MEMXCPY_TX_0 = 51,
STEDMA40_MEMCPY_TX_0 = 51,
STEDMA40_DEV_SLIM1_CH0_TX_HSI_TX_CH4 = 52,
STEDMA40_DEV_SLIM1_CH1_TX_HSI_TX_CH5 = 53,
STEDMA40_DEV_SLIM1_CH2_TX_HSI_TX_CH6 = 54,

4
arch/arm/plat-nomadik/include/plat/ste_dma40.h
View file

@ -148,7 +148,8 @@ struct stedma40_chan_cfg {
* @memcpy_conf_phy: default configuration of physical channel memcpy
* @memcpy_conf_log: default configuration of logical channel memcpy
* @llis_per_log: number of max linked list items per logical channel
*
* @disabled_channels: A vector, ending with -1, that marks physical channels
* that are for different reasons not available for the driver.
*/
struct stedma40_platform_data {
u32 dev_len;
@ -159,6 +160,7 @@ struct stedma40_platform_data {
struct stedma40_chan_cfg *memcpy_conf_phy;
struct stedma40_chan_cfg *memcpy_conf_log;
unsigned int llis_per_log;
int disabled_channels[8];
};
/**

20
drivers/dma/Kconfig
View file

@ -33,6 +33,19 @@ if DMADEVICES
comment "DMA Devices"
config INTEL_MID_DMAC
tristate "Intel MID DMA support for Peripheral DMA controllers"
depends on PCI && X86
select DMA_ENGINE
default n
help
Enable support for the Intel(R) MID DMA engine present
in Intel MID chipsets.
Say Y here if you have such a chipset.
If unsure, say N.
config ASYNC_TX_DISABLE_CHANNEL_SWITCH
bool
@ -175,6 +188,13 @@ config PL330_DMA
You need to provide platform specific settings via
platform_data for a dma-pl330 device.
config PCH_DMA
tristate "Topcliff PCH DMA support"
depends on PCI && X86
select DMA_ENGINE
help
Enable support for the Topcliff PCH DMA engine.
config DMA_ENGINE
bool

2
drivers/dma/Makefile
View file

@ -7,6 +7,7 @@ endif
obj-$(CONFIG_DMA_ENGINE) += dmaengine.o
obj-$(CONFIG_NET_DMA) += iovlock.o
obj-$(CONFIG_INTEL_MID_DMAC) += intel_mid_dma.o
obj-$(CONFIG_DMATEST) += dmatest.o
obj-$(CONFIG_INTEL_IOATDMA) += ioat/
obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
@ -23,3 +24,4 @@ obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
obj-$(CONFIG_PL330_DMA) += pl330.o
obj-$(CONFIG_PCH_DMA) += pch_dma.o

4
drivers/dma/at_hdmac.c
View file

@ -790,12 +790,12 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
list_splice_init(&atchan->queue, &list);
list_splice_init(&atchan->active_list, &list);
spin_unlock_bh(&atchan->lock);
/* Flush all pending and queued descriptors */
list_for_each_entry_safe(desc, _desc, &list, desc_node)
atc_chain_complete(atchan, desc);
spin_unlock_bh(&atchan->lock);
return 0;
}

169
drivers/dma/coh901318.c
View file

@ -72,6 +72,9 @@ struct coh901318_chan {
unsigned long nbr_active_done;
unsigned long busy;
u32 runtime_addr;
u32 runtime_ctrl;
struct coh901318_base *base;
};
@ -190,6 +193,9 @@ static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan)
static inline dma_addr_t
cohc_dev_addr(struct coh901318_chan *cohc)
{
/* Runtime supplied address will take precedence */
if (cohc->runtime_addr)
return cohc->runtime_addr;
return cohc->base->platform->chan_conf[cohc->id].dev_addr;
}
@ -1055,6 +1061,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
params = cohc_chan_param(cohc);
config = params->config;
/*
* Add runtime-specific control on top, make
* sure the bits you set per peripheral channel are
* cleared in the default config from the platform.
*/
ctrl_chained |= cohc->runtime_ctrl;
ctrl_last |= cohc->runtime_ctrl;
ctrl |= cohc->runtime_ctrl;
if (direction == DMA_TO_DEVICE) {
u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |
@ -1113,6 +1127,12 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
if (ret)
goto err_lli_fill;
/*
* Set the default ctrl for the channel to the one from the lli,
* things may have changed due to odd buffer alignment etc.
*/
coh901318_set_ctrl(cohc, lli->control);
COH_DBG(coh901318_list_print(cohc, lli));
/* Pick a descriptor to handle this transfer */
@ -1175,6 +1195,146 @@ coh901318_issue_pending(struct dma_chan *chan)
spin_unlock_irqrestore(&cohc->lock, flags);
}
/*
* Here we wrap in the runtime dma control interface
*/
struct burst_table {
int burst_8bit;
int burst_16bit;
int burst_32bit;
u32 reg;
};
static const struct burst_table burst_sizes[] = {
{
.burst_8bit = 64,
.burst_16bit = 32,
.burst_32bit = 16,
.reg = COH901318_CX_CTRL_BURST_COUNT_64_BYTES,
},
{
.burst_8bit = 48,
.burst_16bit = 24,
.burst_32bit = 12,
.reg = COH901318_CX_CTRL_BURST_COUNT_48_BYTES,
},
{
.burst_8bit = 32,
.burst_16bit = 16,
.burst_32bit = 8,
.reg = COH901318_CX_CTRL_BURST_COUNT_32_BYTES,
},
{
.burst_8bit = 16,
.burst_16bit = 8,
.burst_32bit = 4,
.reg = COH901318_CX_CTRL_BURST_COUNT_16_BYTES,
},
{
.burst_8bit = 8,
.burst_16bit = 4,
.burst_32bit = 2,
.reg = COH901318_CX_CTRL_BURST_COUNT_8_BYTES,
},
{
.burst_8bit = 4,
.burst_16bit = 2,
.burst_32bit = 1,
.reg = COH901318_CX_CTRL_BURST_COUNT_4_BYTES,
},
{
.burst_8bit = 2,
.burst_16bit = 1,
.burst_32bit = 0,
.reg = COH901318_CX_CTRL_BURST_COUNT_2_BYTES,
},
{
.burst_8bit = 1,
.burst_16bit = 0,
.burst_32bit = 0,
.reg = COH901318_CX_CTRL_BURST_COUNT_1_BYTE,
},
};
static void coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct coh901318_chan *cohc = to_coh901318_chan(chan);
dma_addr_t addr;
enum dma_slave_buswidth addr_width;
u32 maxburst;
u32 runtime_ctrl = 0;
int i = 0;
/* We only support mem to per or per to mem transfers */
if (config->direction == DMA_FROM_DEVICE) {
addr = config->src_addr;
addr_width = config->src_addr_width;
maxburst = config->src_maxburst;
} else if (config->direction == DMA_TO_DEVICE) {
addr = config->dst_addr;
addr_width = config->dst_addr_width;
maxburst = config->dst_maxburst;
} else {
dev_err(COHC_2_DEV(cohc), "illegal channel mode\n");
return;
}
dev_dbg(COHC_2_DEV(cohc), "configure channel for %d byte transfers\n",
addr_width);
switch (addr_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
runtime_ctrl |=
COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS |
COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS;
while (i < ARRAY_SIZE(burst_sizes)) {
if (burst_sizes[i].burst_8bit <= maxburst)
break;
i++;
}
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
runtime_ctrl |=
COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS |
COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS;
while (i < ARRAY_SIZE(burst_sizes)) {
if (burst_sizes[i].burst_16bit <= maxburst)
break;
i++;
}
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
/* Direction doesn't matter here, it's 32/32 bits */
runtime_ctrl |=
COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS |
COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS;
while (i < ARRAY_SIZE(burst_sizes)) {
if (burst_sizes[i].burst_32bit <= maxburst)
break;
i++;
}
break;
default:
dev_err(COHC_2_DEV(cohc),
"bad runtimeconfig: alien address width\n");
return;
}
runtime_ctrl |= burst_sizes[i].reg;
dev_dbg(COHC_2_DEV(cohc),
"selected burst size %d bytes for address width %d bytes, maxburst %d\n",
burst_sizes[i].burst_8bit, addr_width, maxburst);
cohc->runtime_addr = addr;
cohc->runtime_ctrl = runtime_ctrl;
}
static int
coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
@ -1184,6 +1344,14 @@ coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
struct coh901318_desc *cohd;
void __iomem *virtbase = cohc->base->virtbase;
if (cmd == DMA_SLAVE_CONFIG) {
struct dma_slave_config *config =
(struct dma_slave_config *) arg;
coh901318_dma_set_runtimeconfig(chan, config);
return 0;
}
if (cmd == DMA_PAUSE) {
coh901318_pause(chan);
return 0;
@ -1240,6 +1408,7 @@ coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
return 0;
}
void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
struct coh901318_base *base)
{

2
drivers/dma/dmatest.c
View file

@ -540,7 +540,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
struct dmatest_chan *dtc;
struct dma_device *dma_dev = chan->device;
unsigned int thread_count = 0;
unsigned int cnt;
int cnt;
dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
if (!dtc) {

1143
drivers/dma/intel_mid_dma.c Normal file
View file

File diff suppressed because it is too large Load diff

260
drivers/dma/intel_mid_dma_regs.h Normal file
View file

@ -0,0 +1,260 @@
/*
* intel_mid_dma_regs.h - Intel MID DMA Drivers
*
* Copyright (C) 2008-10 Intel Corp
* Author: Vinod Koul <vinod.koul@intel.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*
*/
#ifndef __INTEL_MID_DMAC_REGS_H__
#define __INTEL_MID_DMAC_REGS_H__
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/pci_ids.h>
#define INTEL_MID_DMA_DRIVER_VERSION "1.0.5"
#define REG_BIT0 0x00000001
#define REG_BIT8 0x00000100
#define UNMASK_INTR_REG(chan_num) \
((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
#define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
#define ENABLE_CHANNEL(chan_num) \
((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
#define DESCS_PER_CHANNEL 16
/*DMA Registers*/
/*registers associated with channel programming*/
#define DMA_REG_SIZE 0x400
#define DMA_CH_SIZE 0x58
/*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
#define SAR 0x00 /* Source Address Register*/
#define DAR 0x08 /* Destination Address Register*/
#define CTL_LOW 0x18 /* Control Register*/
#define CTL_HIGH 0x1C /* Control Register*/
#define CFG_LOW 0x40 /* Configuration Register Low*/
#define CFG_HIGH 0x44 /* Configuration Register high*/
#define STATUS_TFR 0x2E8
#define STATUS_BLOCK 0x2F0
#define STATUS_ERR 0x308
#define RAW_TFR 0x2C0
#define RAW_BLOCK 0x2C8
#define RAW_ERR 0x2E0
#define MASK_TFR 0x310
#define MASK_BLOCK 0x318
#define MASK_SRC_TRAN 0x320
#define MASK_DST_TRAN 0x328
#define MASK_ERR 0x330
#define CLEAR_TFR 0x338
#define CLEAR_BLOCK 0x340
#define CLEAR_SRC_TRAN 0x348
#define CLEAR_DST_TRAN 0x350
#define CLEAR_ERR 0x358
#define INTR_STATUS 0x360
#define DMA_CFG 0x398
#define DMA_CHAN_EN 0x3A0
/*DMA channel control registers*/
union intel_mid_dma_ctl_lo {
struct {
u32 int_en:1; /*enable or disable interrupts*/
/*should be 0*/
u32 dst_tr_width:3; /*destination transfer width*/
/*usually 32 bits = 010*/
u32 src_tr_width:3; /*source transfer width*/
/*usually 32 bits = 010*/
u32 dinc:2; /*destination address inc/dec*/
/*For mem:INC=00, Periphral NoINC=11*/
u32 sinc:2; /*source address inc or dec, as above*/
u32 dst_msize:3; /*destination burst transaction length*/
/*always = 16 ie 011*/
u32 src_msize:3; /*source burst transaction length*/
/*always = 16 ie 011*/
u32 reser1:3;
u32 tt_fc:3; /*transfer type and flow controller*/
/*M-M = 000
P-M = 010
M-P = 001*/
u32 dms:2; /*destination master select = 0*/
u32 sms:2; /*source master select = 0*/
u32 llp_dst_en:1; /*enable/disable destination LLP = 0*/
u32 llp_src_en:1; /*enable/disable source LLP = 0*/
u32 reser2:3;
} ctlx;
u32 ctl_lo;
};
union intel_mid_dma_ctl_hi {
struct {
u32 block_ts:12; /*block transfer size*/
/*configured by DMAC*/
u32 reser:20;
} ctlx;
u32 ctl_hi;
};
/*DMA channel configuration registers*/
union intel_mid_dma_cfg_lo {
struct {
u32 reser1:5;
u32 ch_prior:3; /*channel priority = 0*/
u32 ch_susp:1; /*channel suspend = 0*/
u32 fifo_empty:1; /*FIFO empty or not R bit = 0*/
u32 hs_sel_dst:1; /*select HW/SW destn handshaking*/
/*HW = 0, SW = 1*/
u32 hs_sel_src:1; /*select HW/SW src handshaking*/
u32 reser2:6;
u32 dst_hs_pol:1; /*dest HS interface polarity*/
u32 src_hs_pol:1; /*src HS interface polarity*/
u32 max_abrst:10; /*max AMBA burst len = 0 (no sw limit*/
u32 reload_src:1; /*auto reload src addr =1 if src is P*/
u32 reload_dst:1; /*AR destn addr =1 if dstn is P*/
} cfgx;
u32 cfg_lo;
};
union intel_mid_dma_cfg_hi {
struct {
u32 fcmode:1; /*flow control mode = 1*/
u32 fifo_mode:1; /*FIFO mode select = 1*/
u32 protctl:3; /*protection control = 0*/
u32 rsvd:2;
u32 src_per:4; /*src hw HS interface*/
u32 dst_per:4; /*dstn hw HS interface*/
u32 reser2:17;
} cfgx;
u32 cfg_hi;
};
/**
* struct intel_mid_dma_chan - internal mid representation of a DMA channel
* @chan: dma_chan strcture represetation for mid chan
* @ch_regs: MMIO register space pointer to channel register
* @dma_base: MMIO register space DMA engine base pointer
* @ch_id: DMA channel id
* @lock: channel spinlock
* @completed: DMA cookie
* @active_list: current active descriptors
* @queue: current queued up descriptors
* @free_list: current free descriptors
* @slave: dma slave struture
* @descs_allocated: total number of decsiptors allocated
* @dma: dma device struture pointer
* @in_use: bool representing if ch is in use or not
*/
struct intel_mid_dma_chan {
struct dma_chan chan;
void __iomem *ch_regs;
void __iomem *dma_base;
int ch_id;
spinlock_t lock;
dma_cookie_t completed;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
struct intel_mid_dma_slave *slave;
unsigned int descs_allocated;
struct middma_device *dma;
bool in_use;
};
static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
struct dma_chan *chan)
{
return container_of(chan, struct intel_mid_dma_chan, chan);
}
/**
* struct middma_device - internal representation of a DMA device
* @pdev: PCI device
* @dma_base: MMIO register space pointer of DMA
* @dma_pool: for allocating DMA descriptors
* @common: embedded struct dma_device
* @tasklet: dma tasklet for processing interrupts
* @ch: per channel data
* @pci_id: DMA device PCI ID
* @intr_mask: Interrupt mask to be used
* @mask_reg: MMIO register for periphral mask
* @chan_base: Base ch index (read from driver data)
* @max_chan: max number of chs supported (from drv_data)
* @block_size: Block size of DMA transfer supported (from drv_data)
* @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
*/
struct middma_device {
struct pci_dev *pdev;
void __iomem *dma_base;
struct pci_pool *dma_pool;
struct dma_device common;
struct tasklet_struct tasklet;
struct intel_mid_dma_chan ch[MAX_CHAN];
unsigned int pci_id;
unsigned int intr_mask;
void __iomem *mask_reg;
int chan_base;
int max_chan;
int block_size;
unsigned int pimr_mask;
};
static inline struct middma_device *to_middma_device(struct dma_device *common)
{
return container_of(common, struct middma_device, common);
}
struct intel_mid_dma_desc {
void __iomem *block; /*ch ptr*/
struct list_head desc_node;
struct dma_async_tx_descriptor txd;
size_t len;
dma_addr_t sar;
dma_addr_t dar;
u32 cfg_hi;
u32 cfg_lo;
u32 ctl_lo;
u32 ctl_hi;
dma_addr_t next;
enum dma_data_direction dirn;
enum dma_status status;
enum intel_mid_dma_width width; /*width of DMA txn*/
enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
};
static inline int test_ch_en(void __iomem *dma, u32 ch_no)
{
u32 en_reg = ioread32(dma + DMA_CHAN_EN);
return (en_reg >> ch_no) & 0x1;
}
static inline struct intel_mid_dma_desc *to_intel_mid_dma_desc
(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct intel_mid_dma_desc, txd);
}
#endif /*__INTEL_MID_DMAC_REGS_H__*/

1
drivers/dma/ioat/dma.h
View file

@ -97,6 +97,7 @@ struct ioat_chan_common {
#define IOAT_RESET_PENDING 2
#define IOAT_KOBJ_INIT_FAIL 3
#define IOAT_RESHAPE_PENDING 4
#define IOAT_RUN 5
struct timer_list timer;
#define COMPLETION_TIMEOUT msecs_to_jiffies(100)
#define IDLE_TIMEOUT msecs_to_jiffies(2000)

20
drivers/dma/ioat/dma_v2.c
View file

@ -287,7 +287,10 @@ void ioat2_timer_event(unsigned long data)
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(chan), "%s: Channel halted (%x)\n",
__func__, chanerr);
if (test_bit(IOAT_RUN, &chan->state))
BUG_ON(is_ioat_bug(chanerr));
else /* we never got off the ground */
return;
}
/* if we haven't made progress and we have already
@ -492,6 +495,8 @@ static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gf
return ring;
}
void ioat2_free_chan_resources(struct dma_chan *c);
/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring
* @chan: channel to be initialized
*/
@ -500,6 +505,7 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
struct ioat_chan_common *chan = &ioat->base;
struct ioat_ring_ent **ring;
u64 status;
int order;
/* have we already been set up? */
@ -540,7 +546,20 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
tasklet_enable(&chan->cleanup_task);
ioat2_start_null_desc(ioat);
/* check that we got off the ground */
udelay(5);
status = ioat_chansts(chan);
if (is_ioat_active(status) || is_ioat_idle(status)) {
set_bit(IOAT_RUN, &chan->state);
return 1 << ioat->alloc_order;
} else {
u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_WARN(to_dev(chan),
"failed to start channel chanerr: %#x\n", chanerr);
ioat2_free_chan_resources(c);
return -EFAULT;
}
}
bool reshape_ring(struct ioat2_dma_chan *ioat, int order)
@ -778,6 +797,7 @@ void ioat2_free_chan_resources(struct dma_chan *c)
del_timer_sync(&chan->timer);
device->cleanup_fn((unsigned long) c);
device->reset_hw(chan);
clear_bit(IOAT_RUN, &chan->state);
spin_lock_bh(&chan->cleanup_lock);
spin_lock_bh(&ioat->prep_lock);

3
drivers/dma/ioat/dma_v3.c
View file

@ -361,7 +361,10 @@ static void ioat3_timer_event(unsigned long data)
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(chan), "%s: Channel halted (%x)\n",
__func__, chanerr);
if (test_bit(IOAT_RUN, &chan->state))
BUG_ON(is_ioat_bug(chanerr));
else /* we never got off the ground */
return;
}
/* if we haven't made progress and we have already

957
drivers/dma/pch_dma.c Normal file
View file

@ -0,0 +1,957 @@
/*
* Topcliff PCH DMA controller driver
* Copyright (c) 2010 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pch_dma.h>
#define DRV_NAME "pch-dma"
#define DMA_CTL0_DISABLE 0x0
#define DMA_CTL0_SG 0x1
#define DMA_CTL0_ONESHOT 0x2
#define DMA_CTL0_MODE_MASK_BITS 0x3
#define DMA_CTL0_DIR_SHIFT_BITS 2
#define DMA_CTL0_BITS_PER_CH 4
#define DMA_CTL2_START_SHIFT_BITS 8
#define DMA_CTL2_IRQ_ENABLE_MASK ((1UL << DMA_CTL2_START_SHIFT_BITS) - 1)
#define DMA_STATUS_IDLE 0x0
#define DMA_STATUS_DESC_READ 0x1
#define DMA_STATUS_WAIT 0x2
#define DMA_STATUS_ACCESS 0x3
#define DMA_STATUS_BITS_PER_CH 2
#define DMA_STATUS_MASK_BITS 0x3
#define DMA_STATUS_SHIFT_BITS 16
#define DMA_STATUS_IRQ(x) (0x1 << (x))
#define DMA_STATUS_ERR(x) (0x1 << ((x) + 8))
#define DMA_DESC_WIDTH_SHIFT_BITS 12
#define DMA_DESC_WIDTH_1_BYTE (0x3 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_WIDTH_2_BYTES (0x2 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_WIDTH_4_BYTES (0x0 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_MAX_COUNT_1_BYTE 0x3FF
#define DMA_DESC_MAX_COUNT_2_BYTES 0x3FF
#define DMA_DESC_MAX_COUNT_4_BYTES 0x7FF
#define DMA_DESC_END_WITHOUT_IRQ 0x0
#define DMA_DESC_END_WITH_IRQ 0x1
#define DMA_DESC_FOLLOW_WITHOUT_IRQ 0x2
#define DMA_DESC_FOLLOW_WITH_IRQ 0x3
#define MAX_CHAN_NR 8
static unsigned int init_nr_desc_per_channel = 64;
module_param(init_nr_desc_per_channel, uint, 0644);
MODULE_PARM_DESC(init_nr_desc_per_channel,
"initial descriptors per channel (default: 64)");
struct pch_dma_desc_regs {
u32 dev_addr;
u32 mem_addr;
u32 size;
u32 next;
};
struct pch_dma_regs {
u32 dma_ctl0;
u32 dma_ctl1;
u32 dma_ctl2;
u32 reserved1;
u32 dma_sts0;
u32 dma_sts1;
u32 reserved2;
u32 reserved3;
struct pch_dma_desc_regs desc[0];
};
struct pch_dma_desc {
struct pch_dma_desc_regs regs;
struct dma_async_tx_descriptor txd;
struct list_head desc_node;
struct list_head tx_list;
};
struct pch_dma_chan {
struct dma_chan chan;
void __iomem *membase;
enum dma_data_direction dir;
struct tasklet_struct tasklet;
unsigned long err_status;
spinlock_t lock;
dma_cookie_t completed_cookie;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
unsigned int descs_allocated;
};
#define PDC_DEV_ADDR 0x00
#define PDC_MEM_ADDR 0x04
#define PDC_SIZE 0x08
#define PDC_NEXT 0x0C
#define channel_readl(pdc, name) \
readl((pdc)->membase + PDC_##name)
#define channel_writel(pdc, name, val) \
writel((val), (pdc)->membase + PDC_##name)
struct pch_dma {
struct dma_device dma;
void __iomem *membase;
struct pci_pool *pool;
struct pch_dma_regs regs;
struct pch_dma_desc_regs ch_regs[MAX_CHAN_NR];
struct pch_dma_chan channels[0];
};
#define PCH_DMA_CTL0 0x00
#define PCH_DMA_CTL1 0x04
#define PCH_DMA_CTL2 0x08
#define PCH_DMA_STS0 0x10
#define PCH_DMA_STS1 0x14
#define dma_readl(pd, name) \
readl((pd)->membase + PCH_DMA_##name)
#define dma_writel(pd, name, val) \
writel((val), (pd)->membase + PCH_DMA_##name)
static inline struct pch_dma_desc *to_pd_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct pch_dma_desc, txd);
}
static inline struct pch_dma_chan *to_pd_chan(struct dma_chan *chan)
{
return container_of(chan, struct pch_dma_chan, chan);
}
static inline struct pch_dma *to_pd(struct dma_device *ddev)
{
return container_of(ddev, struct pch_dma, dma);
}
static inline struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct device *chan2parent(struct dma_chan *chan)
{
return chan->dev->device.parent;
}
static inline struct pch_dma_desc *pdc_first_active(struct pch_dma_chan *pd_chan)
{
return list_first_entry(&pd_chan->active_list,
struct pch_dma_desc, desc_node);
}
static inline struct pch_dma_desc *pdc_first_queued(struct pch_dma_chan *pd_chan)
{
return list_first_entry(&pd_chan->queue,
struct pch_dma_desc, desc_node);
}
static void pdc_enable_irq(struct dma_chan *chan, int enable)
{
struct pch_dma *pd = to_pd(chan->device);
u32 val;
val = dma_readl(pd, CTL2);
if (enable)
val |= 0x1 << chan->chan_id;
else
val &= ~(0x1 << chan->chan_id);
dma_writel(pd, CTL2, val);
dev_dbg(chan2dev(chan), "pdc_enable_irq: chan %d -> %x\n",
chan->chan_id, val);
}
static void pdc_set_dir(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma *pd = to_pd(chan->device);
u32 val;
val = dma_readl(pd, CTL0);
if (pd_chan->dir == DMA_TO_DEVICE)
val |= 0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
DMA_CTL0_DIR_SHIFT_BITS);
else
val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
DMA_CTL0_DIR_SHIFT_BITS));
dma_writel(pd, CTL0, val);
dev_dbg(chan2dev(chan), "pdc_set_dir: chan %d -> %x\n",
chan->chan_id, val);
}
static void pdc_set_mode(struct dma_chan *chan, u32 mode)
{
struct pch_dma *pd = to_pd(chan->device);
u32 val;
val = dma_readl(pd, CTL0);
val &= ~(DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * chan->chan_id));
val |= mode << (DMA_CTL0_BITS_PER_CH * chan->chan_id);
dma_writel(pd, CTL0, val);
dev_dbg(chan2dev(chan), "pdc_set_mode: chan %d -> %x\n",
chan->chan_id, val);
}
static u32 pdc_get_status(struct pch_dma_chan *pd_chan)
{
struct pch_dma *pd = to_pd(pd_chan->chan.device);
u32 val;
val = dma_readl(pd, STS0);
return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id));
}
static bool pdc_is_idle(struct pch_dma_chan *pd_chan)
{
if (pdc_get_status(pd_chan) == DMA_STATUS_IDLE)
return true;
else
return false;
}
static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
{
struct pch_dma *pd = to_pd(pd_chan->chan.device);
u32 val;
if (!pdc_is_idle(pd_chan)) {
dev_err(chan2dev(&pd_chan->chan),
"BUG: Attempt to start non-idle channel\n");
return;
}
channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
channel_writel(pd_chan, SIZE, desc->regs.size);
channel_writel(pd_chan, NEXT, desc->regs.next);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n",
pd_chan->chan.chan_id, desc->regs.dev_addr);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n",
pd_chan->chan.chan_id, desc->regs.mem_addr);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> size: %x\n",
pd_chan->chan.chan_id, desc->regs.size);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n",
pd_chan->chan.chan_id, desc->regs.next);
if (list_empty(&desc->tx_list))
pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT);
else
pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
val = dma_readl(pd, CTL2);
val |= 1 << (DMA_CTL2_START_SHIFT_BITS + pd_chan->chan.chan_id);
dma_writel(pd, CTL2, val);
}
static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
struct pch_dma_desc *desc)
{
struct dma_async_tx_descriptor *txd = &desc->txd;
dma_async_tx_callback callback = txd->callback;
void *param = txd->callback_param;
list_splice_init(&desc->tx_list, &pd_chan->free_list);
list_move(&desc->desc_node, &pd_chan->free_list);
if (callback)
callback(param);
}
static void pdc_complete_all(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *desc, *_d;
LIST_HEAD(list);
BUG_ON(!pdc_is_idle(pd_chan));
if (!list_empty(&pd_chan->queue))
pdc_dostart(pd_chan, pdc_first_queued(pd_chan));
list_splice_init(&pd_chan->active_list, &list);
list_splice_init(&pd_chan->queue, &pd_chan->active_list);
list_for_each_entry_safe(desc, _d, &list, desc_node)
pdc_chain_complete(pd_chan, desc);
}
static void pdc_handle_error(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *bad_desc;
bad_desc = pdc_first_active(pd_chan);
list_del(&bad_desc->desc_node);
list_splice_init(&pd_chan->queue, pd_chan->active_list.prev);
if (!list_empty(&pd_chan->active_list))
pdc_dostart(pd_chan, pdc_first_active(pd_chan));
dev_crit(chan2dev(&pd_chan->chan), "Bad descriptor submitted\n");
dev_crit(chan2dev(&pd_chan->chan), "descriptor cookie: %d\n",
bad_desc->txd.cookie);
pdc_chain_complete(pd_chan, bad_desc);
}
static void pdc_advance_work(struct pch_dma_chan *pd_chan)
{
if (list_empty(&pd_chan->active_list) ||
list_is_singular(&pd_chan->active_list)) {
pdc_complete_all(pd_chan);
} else {
pdc_chain_complete(pd_chan, pdc_first_active(pd_chan));
pdc_dostart(pd_chan, pdc_first_active(pd_chan));
}
}
static dma_cookie_t pdc_assign_cookie(struct pch_dma_chan *pd_chan,
struct pch_dma_desc *desc)
{
dma_cookie_t cookie = pd_chan->chan.cookie;
if (++cookie < 0)
cookie = 1;
pd_chan->chan.cookie = cookie;
desc->txd.cookie = cookie;
return cookie;
}
static dma_cookie_t pd_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct pch_dma_desc *desc = to_pd_desc(txd);
struct pch_dma_chan *pd_chan = to_pd_chan(txd->chan);
dma_cookie_t cookie;
spin_lock_bh(&pd_chan->lock);
cookie = pdc_assign_cookie(pd_chan, desc);
if (list_empty(&pd_chan->active_list)) {
list_add_tail(&desc->desc_node, &pd_chan->active_list);
pdc_dostart(pd_chan, desc);
} else {
list_add_tail(&desc->desc_node, &pd_chan->queue);
}
spin_unlock_bh(&pd_chan->lock);
return 0;
}
static struct pch_dma_desc *pdc_alloc_desc(struct dma_chan *chan, gfp_t flags)
{
struct pch_dma_desc *desc = NULL;
struct pch_dma *pd = to_pd(chan->device);
dma_addr_t addr;
desc = pci_pool_alloc(pd->pool, GFP_KERNEL, &addr);
if (desc) {
memset(desc, 0, sizeof(struct pch_dma_desc));
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.tx_submit = pd_tx_submit;
desc->txd.flags = DMA_CTRL_ACK;
desc->txd.phys = addr;
}
return desc;
}
static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *desc, *_d;
struct pch_dma_desc *ret = NULL;
int i;
spin_lock_bh(&pd_chan->lock);
list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) {
i++;
if (async_tx_test_ack(&desc->txd)) {
list_del(&desc->desc_node);
ret = desc;
break;
}
dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc);
}
spin_unlock_bh(&pd_chan->lock);
dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i);
if (!ret) {
ret = pdc_alloc_desc(&pd_chan->chan, GFP_NOIO);
if (ret) {
spin_lock_bh(&pd_chan->lock);
pd_chan->descs_allocated++;
spin_unlock_bh(&pd_chan->lock);
} else {
dev_err(chan2dev(&pd_chan->chan),
"failed to alloc desc\n");
}
}
return ret;
}
static void pdc_desc_put(struct pch_dma_chan *pd_chan,
struct pch_dma_desc *desc)
{
if (desc) {
spin_lock_bh(&pd_chan->lock);
list_splice_init(&desc->tx_list, &pd_chan->free_list);
list_add(&desc->desc_node, &pd_chan->free_list);
spin_unlock_bh(&pd_chan->lock);
}
}
static int pd_alloc_chan_resources(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_desc *desc;
LIST_HEAD(tmp_list);
int i;
if (!pdc_is_idle(pd_chan)) {
dev_dbg(chan2dev(chan), "DMA channel not idle ?\n");
return -EIO;
}
if (!list_empty(&pd_chan->free_list))
return pd_chan->descs_allocated;
for (i = 0; i < init_nr_desc_per_channel; i++) {
desc = pdc_alloc_desc(chan, GFP_KERNEL);
if (!desc) {
dev_warn(chan2dev(chan),
"Only allocated %d initial descriptors\n", i);
break;
}
list_add_tail(&desc->desc_node, &tmp_list);
}
spin_lock_bh(&pd_chan->lock);
list_splice(&tmp_list, &pd_chan->free_list);
pd_chan->descs_allocated = i;
pd_chan->completed_cookie = chan->cookie = 1;
spin_unlock_bh(&pd_chan->lock);
pdc_enable_irq(chan, 1);
pdc_set_dir(chan);
return pd_chan->descs_allocated;
}
static void pd_free_chan_resources(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma *pd = to_pd(chan->device);
struct pch_dma_desc *desc, *_d;
LIST_HEAD(tmp_list);
BUG_ON(!pdc_is_idle(pd_chan));
BUG_ON(!list_empty(&pd_chan->active_list));
BUG_ON(!list_empty(&pd_chan->queue));
spin_lock_bh(&pd_chan->lock);
list_splice_init(&pd_chan->free_list, &tmp_list);
pd_chan->descs_allocated = 0;
spin_unlock_bh(&pd_chan->lock);
list_for_each_entry_safe(desc, _d, &tmp_list, desc_node)
pci_pool_free(pd->pool, desc, desc->txd.phys);
pdc_enable_irq(chan, 0);
}
static enum dma_status pd_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
dma_cookie_t last_used;
dma_cookie_t last_completed;
int ret;
spin_lock_bh(&pd_chan->lock);
last_completed = pd_chan->completed_cookie;
last_used = chan->cookie;
spin_unlock_bh(&pd_chan->lock);
ret = dma_async_is_complete(cookie, last_completed, last_used);
dma_set_tx_state(txstate, last_completed, last_used, 0);
return ret;
}
static void pd_issue_pending(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
if (pdc_is_idle(pd_chan)) {
spin_lock_bh(&pd_chan->lock);
pdc_advance_work(pd_chan);
spin_unlock_bh(&pd_chan->lock);
}
}
static struct dma_async_tx_descriptor *pd_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
enum dma_data_direction direction, unsigned long flags)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_slave *pd_slave = chan->private;
struct pch_dma_desc *first = NULL;
struct pch_dma_desc *prev = NULL;
struct pch_dma_desc *desc = NULL;
struct scatterlist *sg;
dma_addr_t reg;
int i;
if (unlikely(!sg_len)) {
dev_info(chan2dev(chan), "prep_slave_sg: length is zero!\n");
return NULL;
}
if (direction == DMA_FROM_DEVICE)
reg = pd_slave->rx_reg;
else if (direction == DMA_TO_DEVICE)
reg = pd_slave->tx_reg;
else
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
desc = pdc_desc_get(pd_chan);
if (!desc)
goto err_desc_get;
desc->regs.dev_addr = reg;
desc->regs.mem_addr = sg_phys(sg);
desc->regs.size = sg_dma_len(sg);
desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ;
switch (pd_slave->width) {
case PCH_DMA_WIDTH_1_BYTE:
if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_1_BYTE;
break;
case PCH_DMA_WIDTH_2_BYTES:
if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_2_BYTES;
break;
case PCH_DMA_WIDTH_4_BYTES:
if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_4_BYTES;
break;
default:
goto err_desc_get;
}
if (!first) {
first = desc;
} else {
prev->regs.next |= desc->txd.phys;
list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
}
if (flags & DMA_PREP_INTERRUPT)
desc->regs.next = DMA_DESC_END_WITH_IRQ;
else
desc->regs.next = DMA_DESC_END_WITHOUT_IRQ;
first->txd.cookie = -EBUSY;
desc->txd.flags = flags;
return &first->txd;
err_desc_get:
dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n");
pdc_desc_put(pd_chan, first);
return NULL;
}
static int pd_device_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_desc *desc, *_d;
LIST_HEAD(list);
if (cmd != DMA_TERMINATE_ALL)
return -ENXIO;
spin_lock_bh(&pd_chan->lock);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_DISABLE);
list_splice_init(&pd_chan->active_list, &list);
list_splice_init(&pd_chan->queue, &list);
list_for_each_entry_safe(desc, _d, &list, desc_node)
pdc_chain_complete(pd_chan, desc);
spin_unlock_bh(&pd_chan->lock);
return 0;
}
static void pdc_tasklet(unsigned long data)
{
struct pch_dma_chan *pd_chan = (struct pch_dma_chan *)data;
if (!pdc_is_idle(pd_chan)) {
dev_err(chan2dev(&pd_chan->chan),
"BUG: handle non-idle channel in tasklet\n");
return;
}
spin_lock_bh(&pd_chan->lock);
if (test_and_clear_bit(0, &pd_chan->err_status))
pdc_handle_error(pd_chan);
else
pdc_advance_work(pd_chan);
spin_unlock_bh(&pd_chan->lock);
}
static irqreturn_t pd_irq(int irq, void *devid)
{
struct pch_dma *pd = (struct pch_dma *)devid;
struct pch_dma_chan *pd_chan;
u32 sts0;
int i;
int ret = IRQ_NONE;
sts0 = dma_readl(pd, STS0);
dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0);
for (i = 0; i < pd->dma.chancnt; i++) {
pd_chan = &pd->channels[i];
if (sts0 & DMA_STATUS_IRQ(i)) {
if (sts0 & DMA_STATUS_ERR(i))
set_bit(0, &pd_chan->err_status);
tasklet_schedule(&pd_chan->tasklet);
ret = IRQ_HANDLED;
}
}
/* clear interrupt bits in status register */
dma_writel(pd, STS0, sts0);
return ret;
}
static void pch_dma_save_regs(struct pch_dma *pd)
{
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
int i = 0;
pd->regs.dma_ctl0 = dma_readl(pd, CTL0);
pd->regs.dma_ctl1 = dma_readl(pd, CTL1);
pd->regs.dma_ctl2 = dma_readl(pd, CTL2);
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
pd_chan = to_pd_chan(chan);
pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);
i++;
}
}
static void pch_dma_restore_regs(struct pch_dma *pd)
{
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
int i = 0;
dma_writel(pd, CTL0, pd->regs.dma_ctl0);
dma_writel(pd, CTL1, pd->regs.dma_ctl1);
dma_writel(pd, CTL2, pd->regs.dma_ctl2);
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
pd_chan = to_pd_chan(chan);
channel_writel(pd_chan, DEV_ADDR, pd->ch_regs[i].dev_addr);
channel_writel(pd_chan, MEM_ADDR, pd->ch_regs[i].mem_addr);
channel_writel(pd_chan, SIZE, pd->ch_regs[i].size);
channel_writel(pd_chan, NEXT, pd->ch_regs[i].next);
i++;
}
}
static int pch_dma_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct pch_dma *pd = pci_get_drvdata(pdev);
if (pd)
pch_dma_save_regs(pd);
pci_save_state(pdev);
pci_disable_device(pdev);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
return 0;
}
static int pch_dma_resume(struct pci_dev *pdev)
{
struct pch_dma *pd = pci_get_drvdata(pdev);
int err;
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
err = pci_enable_device(pdev);
if (err) {
dev_dbg(&pdev->dev, "failed to enable device\n");
return err;
}
if (pd)
pch_dma_restore_regs(pd);
return 0;
}
static int __devinit pch_dma_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct pch_dma *pd;
struct pch_dma_regs *regs;
unsigned int nr_channels;
int err;
int i;
nr_channels = id->driver_data;
pd = kzalloc(sizeof(struct pch_dma)+
sizeof(struct pch_dma_chan) * nr_channels, GFP_KERNEL);
if (!pd)
return -ENOMEM;
pci_set_drvdata(pdev, pd);
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "Cannot enable PCI device\n");
goto err_free_mem;
}
if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
dev_err(&pdev->dev, "Cannot find proper base address\n");
goto err_disable_pdev;
}
err = pci_request_regions(pdev, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "Cannot obtain PCI resources\n");
goto err_disable_pdev;
}
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev, "Cannot set proper DMA config\n");
goto err_free_res;
}
regs = pd->membase = pci_iomap(pdev, 1, 0);
if (!pd->membase) {
dev_err(&pdev->dev, "Cannot map MMIO registers\n");
err = -ENOMEM;
goto err_free_res;
}
pci_set_master(pdev);
err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd);
if (err) {
dev_err(&pdev->dev, "Failed to request IRQ\n");
goto err_iounmap;
}
pd->pool = pci_pool_create("pch_dma_desc_pool", pdev,
sizeof(struct pch_dma_desc), 4, 0);
if (!pd->pool) {
dev_err(&pdev->dev, "Failed to alloc DMA descriptors\n");
err = -ENOMEM;
goto err_free_irq;
}
pd->dma.dev = &pdev->dev;
pd->dma.chancnt = nr_channels;
INIT_LIST_HEAD(&pd->dma.channels);
for (i = 0; i < nr_channels; i++) {
struct pch_dma_chan *pd_chan = &pd->channels[i];
pd_chan->chan.device = &pd->dma;
pd_chan->chan.cookie = 1;
pd_chan->chan.chan_id = i;
pd_chan->membase = &regs->desc[i];
pd_chan->dir = (i % 2) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
spin_lock_init(&pd_chan->lock);
INIT_LIST_HEAD(&pd_chan->active_list);
INIT_LIST_HEAD(&pd_chan->queue);
INIT_LIST_HEAD(&pd_chan->free_list);
tasklet_init(&pd_chan->tasklet, pdc_tasklet,
(unsigned long)pd_chan);
list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels);
}
dma_cap_zero(pd->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, pd->dma.cap_mask);
dma_cap_set(DMA_SLAVE, pd->dma.cap_mask);
pd->dma.device_alloc_chan_resources = pd_alloc_chan_resources;
pd->dma.device_free_chan_resources = pd_free_chan_resources;
pd->dma.device_tx_status = pd_tx_status;
pd->dma.device_issue_pending = pd_issue_pending;
pd->dma.device_prep_slave_sg = pd_prep_slave_sg;
pd->dma.device_control = pd_device_control;
err = dma_async_device_register(&pd->dma);
if (err) {
dev_err(&pdev->dev, "Failed to register DMA device\n");
goto err_free_pool;
}
return 0;
err_free_pool:
pci_pool_destroy(pd->pool);
err_free_irq:
free_irq(pdev->irq, pd);
err_iounmap:
pci_iounmap(pdev, pd->membase);
err_free_res:
pci_release_regions(pdev);
err_disable_pdev:
pci_disable_device(pdev);
err_free_mem:
return err;
}
static void __devexit pch_dma_remove(struct pci_dev *pdev)
{
struct pch_dma *pd = pci_get_drvdata(pdev);
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
if (pd) {
dma_async_device_unregister(&pd->dma);
list_for_each_entry_safe(chan, _c, &pd->dma.channels,
device_node) {
pd_chan = to_pd_chan(chan);
tasklet_disable(&pd_chan->tasklet);
tasklet_kill(&pd_chan->tasklet);
}
pci_pool_destroy(pd->pool);
free_irq(pdev->irq, pd);
pci_iounmap(pdev, pd->membase);
pci_release_regions(pdev);
pci_disable_device(pdev);
kfree(pd);
}
}
/* PCI Device ID of DMA device */
#define PCI_DEVICE_ID_PCH_DMA_8CH 0x8810
#define PCI_DEVICE_ID_PCH_DMA_4CH 0x8815
static const struct pci_device_id pch_dma_id_table[] = {
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_DMA_8CH), 8 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_DMA_4CH), 4 },
};
static struct pci_driver pch_dma_driver = {
.name = DRV_NAME,
.id_table = pch_dma_id_table,
.probe = pch_dma_probe,
.remove = __devexit_p(pch_dma_remove),
#ifdef CONFIG_PM
.suspend = pch_dma_suspend,
.resume = pch_dma_resume,
#endif
};
static int __init pch_dma_init(void)
{
return pci_register_driver(&pch_dma_driver);
}
static void __exit pch_dma_exit(void)
{
pci_unregister_driver(&pch_dma_driver);
}
module_init(pch_dma_init);
module_exit(pch_dma_exit);
MODULE_DESCRIPTION("Topcliff PCH DMA controller driver");
MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
MODULE_LICENSE("GPL v2");

806
drivers/dma/ste_dma40.c
View file

File diff suppressed because it is too large Load diff

40
drivers/dma/ste_dma40_ll.c
View file

@ -315,11 +315,8 @@ int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
int total_size = 0;
struct scatterlist *current_sg = sg;
int i;
u32 next_lli_off_dst;
u32 next_lli_off_src;
next_lli_off_src = 0;
next_lli_off_dst = 0;
u32 next_lli_off_dst = 0;
u32 next_lli_off_src = 0;
for_each_sg(sg, current_sg, sg_len, i) {
total_size += sg_dma_len(current_sg);
@ -351,7 +348,7 @@ int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
sg_dma_len(current_sg),
next_lli_off_src,
lcsp->lcsp1, src_data_width,
term_int && !next_lli_off_src,
false,
true);
d40_log_fill_lli(&lli->dst[i],
dev_addr,
@ -375,7 +372,7 @@ int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
sg_dma_len(current_sg),
next_lli_off_src,
lcsp->lcsp1, src_data_width,
term_int && !next_lli_off_src,
false,
false);
}
}
@ -423,32 +420,35 @@ int d40_log_sg_to_lli(int lcla_id,
return total_size;
}
void d40_log_lli_write(struct d40_log_lli_full *lcpa,
int d40_log_lli_write(struct d40_log_lli_full *lcpa,
struct d40_log_lli *lcla_src,
struct d40_log_lli *lcla_dst,
struct d40_log_lli *lli_dst,
struct d40_log_lli *lli_src,
int llis_per_log)
{
u32 slos = 0;
u32 dlos = 0;
u32 slos;
u32 dlos;
int i;
lcpa->lcsp0 = lli_src->lcsp02;
lcpa->lcsp1 = lli_src->lcsp13;
lcpa->lcsp2 = lli_dst->lcsp02;
lcpa->lcsp3 = lli_dst->lcsp13;
writel(lli_src->lcsp02, &lcpa->lcsp0);
writel(lli_src->lcsp13, &lcpa->lcsp1);
writel(lli_dst->lcsp02, &lcpa->lcsp2);
writel(lli_dst->lcsp13, &lcpa->lcsp3);
slos = lli_src->lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
dlos = lli_dst->lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
for (i = 0; (i < llis_per_log) && slos && dlos; i++) {
writel(lli_src[i+1].lcsp02, &lcla_src[i].lcsp02);
writel(lli_src[i+1].lcsp13, &lcla_src[i].lcsp13);
writel(lli_dst[i+1].lcsp02, &lcla_dst[i].lcsp02);
writel(lli_dst[i+1].lcsp13, &lcla_dst[i].lcsp13);
writel(lli_src[i + 1].lcsp02, &lcla_src[i].lcsp02);
writel(lli_src[i + 1].lcsp13, &lcla_src[i].lcsp13);
writel(lli_dst[i + 1].lcsp02, &lcla_dst[i].lcsp02);
writel(lli_dst[i + 1].lcsp13, &lcla_dst[i].lcsp13);
slos = lli_src[i+1].lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
dlos = lli_dst[i+1].lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
slos = lli_src[i + 1].lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
dlos = lli_dst[i + 1].lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
}
return i;
}

5
drivers/dma/ste_dma40_ll.h
View file

@ -13,6 +13,9 @@
#define D40_DREG_PCDELTA (8 * 4)
#define D40_LLI_ALIGN 16 /* LLI alignment must be 16 bytes. */
#define D40_LCPA_CHAN_SIZE 32
#define D40_LCPA_CHAN_DST_DELTA 16
#define D40_TYPE_TO_GROUP(type) (type / 16)
#define D40_TYPE_TO_EVENT(type) (type % 16)
@ -336,7 +339,7 @@ int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
bool term_int, dma_addr_t dev_addr, int max_len,
int llis_per_log);
void d40_log_lli_write(struct d40_log_lli_full *lcpa,
int d40_log_lli_write(struct d40_log_lli_full *lcpa,
struct d40_log_lli *lcla_src,
struct d40_log_lli *lcla_dst,
struct d40_log_lli *lli_dst,

8
drivers/dma/timb_dma.c
View file

@ -200,8 +200,8 @@ static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
return -EINVAL;
}
dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: %p\n",
dma_desc, (void *)sg_dma_address(sg));
dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: 0x%llx\n",
dma_desc, (unsigned long long)sg_dma_address(sg));
dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff;
dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff;
@ -382,7 +382,7 @@ static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
td_desc = kzalloc(sizeof(struct timb_dma_desc), GFP_KERNEL);
if (!td_desc) {
dev_err(chan2dev(chan), "Failed to alloc descriptor\n");
goto err;
goto out;
}
td_desc->desc_list_len = td_chan->desc_elems * TIMB_DMA_DESC_SIZE;
@ -410,7 +410,7 @@ static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
err:
kfree(td_desc->desc_list);
kfree(td_desc);
out:
return NULL;
}

28
drivers/pci/intel-iommu.c
View file

@ -3030,6 +3030,34 @@ static void __init iommu_exit_mempool(void)
}
static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)
{
struct dmar_drhd_unit *drhd;
u32 vtbar;
int rc;
/* We know that this device on this chipset has its own IOMMU.
* If we find it under a different IOMMU, then the BIOS is lying
* to us. Hope that the IOMMU for this device is actually
* disabled, and it needs no translation...
*/
rc = pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(0, 0), 0xb0, &vtbar);
if (rc) {
/* "can't" happen */
dev_info(&pdev->dev, "failed to run vt-d quirk\n");
return;
}
vtbar &= 0xffff0000;
/* we know that the this iommu should be at offset 0xa000 from vtbar */
drhd = dmar_find_matched_drhd_unit(pdev);
if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000,
TAINT_FIRMWARE_WORKAROUND,
"BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n"))
pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quirk_ioat_snb_local_iommu);
static void __init init_no_remapping_devices(void)
{
struct dmar_drhd_unit *drhd;

71
include/linux/dmaengine.h
View file

@ -114,11 +114,17 @@ enum dma_ctrl_flags {
* @DMA_TERMINATE_ALL: terminate all ongoing transfers
* @DMA_PAUSE: pause ongoing transfers
* @DMA_RESUME: resume paused transfer
* @DMA_SLAVE_CONFIG: this command is only implemented by DMA controllers
* that need to runtime reconfigure the slave channels (as opposed to passing
* configuration data in statically from the platform). An additional
* argument of struct dma_slave_config must be passed in with this
* command.
*/
enum dma_ctrl_cmd {
DMA_TERMINATE_ALL,
DMA_PAUSE,
DMA_RESUME,
DMA_SLAVE_CONFIG,
};
/**
@ -199,6 +205,71 @@ struct dma_chan_dev {
atomic_t *idr_ref;
};
/**
* enum dma_slave_buswidth - defines bus with of the DMA slave
* device, source or target buses
*/
enum dma_slave_buswidth {
DMA_SLAVE_BUSWIDTH_UNDEFINED = 0,
DMA_SLAVE_BUSWIDTH_1_BYTE = 1,
DMA_SLAVE_BUSWIDTH_2_BYTES = 2,
DMA_SLAVE_BUSWIDTH_4_BYTES = 4,
DMA_SLAVE_BUSWIDTH_8_BYTES = 8,
};
/**
* struct dma_slave_config - dma slave channel runtime config
* @direction: whether the data shall go in or out on this slave
* channel, right now. DMA_TO_DEVICE and DMA_FROM_DEVICE are
* legal values, DMA_BIDIRECTIONAL is not acceptable since we
* need to differentiate source and target addresses.
* @src_addr: this is the physical address where DMA slave data
* should be read (RX), if the source is memory this argument is
* ignored.
* @dst_addr: this is the physical address where DMA slave data
* should be written (TX), if the source is memory this argument
* is ignored.
* @src_addr_width: this is the width in bytes of the source (RX)
* register where DMA data shall be read. If the source
* is memory this may be ignored depending on architecture.
* Legal values: 1, 2, 4, 8.
* @dst_addr_width: same as src_addr_width but for destination
* target (TX) mutatis mutandis.
* @src_maxburst: the maximum number of words (note: words, as in
* units of the src_addr_width member, not bytes) that can be sent
* in one burst to the device. Typically something like half the
* FIFO depth on I/O peripherals so you don't overflow it. This
* may or may not be applicable on memory sources.
* @dst_maxburst: same as src_maxburst but for destination target
* mutatis mutandis.
*
* This struct is passed in as configuration data to a DMA engine
* in order to set up a certain channel for DMA transport at runtime.
* The DMA device/engine has to provide support for an additional
* command in the channel config interface, DMA_SLAVE_CONFIG
* and this struct will then be passed in as an argument to the
* DMA engine device_control() function.
*
* The rationale for adding configuration information to this struct
* is as follows: if it is likely that most DMA slave controllers in
* the world will support the configuration option, then make it
* generic. If not: if it is fixed so that it be sent in static from
* the platform data, then prefer to do that. Else, if it is neither
* fixed at runtime, nor generic enough (such as bus mastership on
* some CPU family and whatnot) then create a custom slave config
* struct and pass that, then make this config a member of that
* struct, if applicable.
*/
struct dma_slave_config {
enum dma_data_direction direction;
dma_addr_t src_addr;
dma_addr_t dst_addr;
enum dma_slave_buswidth src_addr_width;
enum dma_slave_buswidth dst_addr_width;
u32 src_maxburst;
u32 dst_maxburst;
};
static inline const char *dma_chan_name(struct dma_chan *chan)
{
return dev_name(&chan->dev->device);

86
include/linux/intel_mid_dma.h Normal file
View file

@ -0,0 +1,86 @@
/*
* intel_mid_dma.h - Intel MID DMA Drivers
*
* Copyright (C) 2008-10 Intel Corp
* Author: Vinod Koul <vinod.koul@intel.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*
*/
#ifndef __INTEL_MID_DMA_H__
#define __INTEL_MID_DMA_H__
#include <linux/dmaengine.h>
/*DMA transaction width, src and dstn width would be same
The DMA length must be width aligned,
for 32 bit width the length must be 32 bit (4bytes) aligned only*/
enum intel_mid_dma_width {
LNW_DMA_WIDTH_8BIT = 0x0,
LNW_DMA_WIDTH_16BIT = 0x1,
LNW_DMA_WIDTH_32BIT = 0x2,
};
/*DMA mode configurations*/
enum intel_mid_dma_mode {
LNW_DMA_PER_TO_MEM = 0, /*periphral to memory configuration*/
LNW_DMA_MEM_TO_PER, /*memory to periphral configuration*/
LNW_DMA_MEM_TO_MEM, /*mem to mem confg (testing only)*/
};
/*DMA handshaking*/
enum intel_mid_dma_hs_mode {
LNW_DMA_HW_HS = 0, /*HW Handshaking only*/
LNW_DMA_SW_HS = 1, /*SW Handshaking not recommended*/
};
/*Burst size configuration*/
enum intel_mid_dma_msize {
LNW_DMA_MSIZE_1 = 0x0,
LNW_DMA_MSIZE_4 = 0x1,
LNW_DMA_MSIZE_8 = 0x2,
LNW_DMA_MSIZE_16 = 0x3,
LNW_DMA_MSIZE_32 = 0x4,
LNW_DMA_MSIZE_64 = 0x5,
};
/**
* struct intel_mid_dma_slave - DMA slave structure
*
* @dirn: DMA trf direction
* @src_width: tx register width
* @dst_width: rx register width
* @hs_mode: HW/SW handshaking mode
* @cfg_mode: DMA data transfer mode (per-per/mem-per/mem-mem)
* @src_msize: Source DMA burst size
* @dst_msize: Dst DMA burst size
* @device_instance: DMA peripheral device instance, we can have multiple
* peripheral device connected to single DMAC
*/
struct intel_mid_dma_slave {
enum dma_data_direction dirn;
enum intel_mid_dma_width src_width; /*width of DMA src txn*/
enum intel_mid_dma_width dst_width; /*width of DMA dst txn*/
enum intel_mid_dma_hs_mode hs_mode; /*handshaking*/
enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
enum intel_mid_dma_msize src_msize; /*size if src burst*/
enum intel_mid_dma_msize dst_msize; /*size of dst burst*/
unsigned int device_instance; /*0, 1 for periphral instance*/
};
#endif /*__INTEL_MID_DMA_H__*/

37
include/linux/pch_dma.h Normal file
View file

@ -0,0 +1,37 @@
/*
* Copyright (c) 2010 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef PCH_DMA_H
#define PCH_DMA_H
#include <linux/dmaengine.h>
enum pch_dma_width {
PCH_DMA_WIDTH_1_BYTE,
PCH_DMA_WIDTH_2_BYTES,
PCH_DMA_WIDTH_4_BYTES,
};
struct pch_dma_slave {
struct device *dma_dev;
unsigned int chan_id;
dma_addr_t tx_reg;
dma_addr_t rx_reg;
enum pch_dma_width width;
};
#endif