blob: 23c5573e62ddd1d6b8aec8be10e9f47bcfaad39e [file] [log] [blame]
/*
* Copyright (C) Ericsson AB 2007-2008
* Copyright (C) ST-Ericsson SA 2008-2010
* Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/amba/bus.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_data/dma-ste-dma40.h>
#include "dmaengine.h"
#include "ste_dma40_ll.h"
#define D40_NAME "dma40"
#define D40_PHY_CHAN -1
/* For masking out/in 2 bit channel positions */
#define D40_CHAN_POS(chan) (2 * (chan / 2))
#define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan))
/* Maximum iterations taken before giving up suspending a channel */
#define D40_SUSPEND_MAX_IT 500
/* Milliseconds */
#define DMA40_AUTOSUSPEND_DELAY 100
/* Hardware requirement on LCLA alignment */
#define LCLA_ALIGNMENT 0x40000
/* Max number of links per event group */
#define D40_LCLA_LINK_PER_EVENT_GRP 128
#define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
/* Attempts before giving up to trying to get pages that are aligned */
#define MAX_LCLA_ALLOC_ATTEMPTS 256
/* Bit markings for allocation map */
#define D40_ALLOC_FREE (1 << 31)
#define D40_ALLOC_PHY (1 << 30)
#define D40_ALLOC_LOG_FREE 0
/**
* enum 40_command - The different commands and/or statuses.
*
* @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
* @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
* @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
* @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
*/
enum d40_command {
D40_DMA_STOP = 0,
D40_DMA_RUN = 1,
D40_DMA_SUSPEND_REQ = 2,
D40_DMA_SUSPENDED = 3
};
/*
* enum d40_events - The different Event Enables for the event lines.
*
* @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan.
* @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan.
* @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line.
* @D40_ROUND_EVENTLINE: Status check for event line.
*/
enum d40_events {
D40_DEACTIVATE_EVENTLINE = 0,
D40_ACTIVATE_EVENTLINE = 1,
D40_SUSPEND_REQ_EVENTLINE = 2,
D40_ROUND_EVENTLINE = 3
};
/*
* These are the registers that has to be saved and later restored
* when the DMA hw is powered off.
* TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works.
*/
static u32 d40_backup_regs[] = {
D40_DREG_LCPA,
D40_DREG_LCLA,
D40_DREG_PRMSE,
D40_DREG_PRMSO,
D40_DREG_PRMOE,
D40_DREG_PRMOO,
};
#define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs)
/* TODO: Check if all these registers have to be saved/restored on dma40 v3 */
static u32 d40_backup_regs_v3[] = {
D40_DREG_PSEG1,
D40_DREG_PSEG2,
D40_DREG_PSEG3,
D40_DREG_PSEG4,
D40_DREG_PCEG1,
D40_DREG_PCEG2,
D40_DREG_PCEG3,
D40_DREG_PCEG4,
D40_DREG_RSEG1,
D40_DREG_RSEG2,
D40_DREG_RSEG3,
D40_DREG_RSEG4,
D40_DREG_RCEG1,
D40_DREG_RCEG2,
D40_DREG_RCEG3,
D40_DREG_RCEG4,
};
#define BACKUP_REGS_SZ_V3 ARRAY_SIZE(d40_backup_regs_v3)
static u32 d40_backup_regs_chan[] = {
D40_CHAN_REG_SSCFG,
D40_CHAN_REG_SSELT,
D40_CHAN_REG_SSPTR,
D40_CHAN_REG_SSLNK,
D40_CHAN_REG_SDCFG,
D40_CHAN_REG_SDELT,
D40_CHAN_REG_SDPTR,
D40_CHAN_REG_SDLNK,
};
/**
* struct d40_lli_pool - Structure for keeping LLIs in memory
*
* @base: Pointer to memory area when the pre_alloc_lli's are not large
* enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
* pre_alloc_lli is used.
* @dma_addr: DMA address, if mapped
* @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
* @pre_alloc_lli: Pre allocated area for the most common case of transfers,
* one buffer to one buffer.
*/
struct d40_lli_pool {
void *base;
int size;
dma_addr_t dma_addr;
/* Space for dst and src, plus an extra for padding */
u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
};
/**
* struct d40_desc - A descriptor is one DMA job.
*
* @lli_phy: LLI settings for physical channel. Both src and dst=
* points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
* lli_len equals one.
* @lli_log: Same as above but for logical channels.
* @lli_pool: The pool with two entries pre-allocated.
* @lli_len: Number of llis of current descriptor.
* @lli_current: Number of transferred llis.
* @lcla_alloc: Number of LCLA entries allocated.
* @txd: DMA engine struct. Used for among other things for communication
* during a transfer.
* @node: List entry.
* @is_in_client_list: true if the client owns this descriptor.
* @cyclic: true if this is a cyclic job
*
* This descriptor is used for both logical and physical transfers.
*/
struct d40_desc {
/* LLI physical */
struct d40_phy_lli_bidir lli_phy;
/* LLI logical */
struct d40_log_lli_bidir lli_log;
struct d40_lli_pool lli_pool;
int lli_len;
int lli_current;
int lcla_alloc;
struct dma_async_tx_descriptor txd;
struct list_head node;
bool is_in_client_list;
bool cyclic;
};
/**
* struct d40_lcla_pool - LCLA pool settings and data.
*
* @base: The virtual address of LCLA. 18 bit aligned.
* @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
* This pointer is only there for clean-up on error.
* @pages: The number of pages needed for all physical channels.
* Only used later for clean-up on error
* @lock: Lock to protect the content in this struct.
* @alloc_map: big map over which LCLA entry is own by which job.
*/
struct d40_lcla_pool {
void *base;
dma_addr_t dma_addr;
void *base_unaligned;
int pages;
spinlock_t lock;
struct d40_desc **alloc_map;
};
/**
* struct d40_phy_res - struct for handling eventlines mapped to physical
* channels.
*
* @lock: A lock protection this entity.
* @reserved: True if used by secure world or otherwise.
* @num: The physical channel number of this entity.
* @allocated_src: Bit mapped to show which src event line's are mapped to
* this physical channel. Can also be free or physically allocated.
* @allocated_dst: Same as for src but is dst.
* allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
* event line number.
*/
struct d40_phy_res {
spinlock_t lock;
bool reserved;
int num;
u32 allocated_src;
u32 allocated_dst;
};
struct d40_base;
/**
* struct d40_chan - Struct that describes a channel.
*
* @lock: A spinlock to protect this struct.
* @log_num: The logical number, if any of this channel.
* @pending_tx: The number of pending transfers. Used between interrupt handler
* and tasklet.
* @busy: Set to true when transfer is ongoing on this channel.
* @phy_chan: Pointer to physical channel which this instance runs on. If this
* point is NULL, then the channel is not allocated.
* @chan: DMA engine handle.
* @tasklet: Tasklet that gets scheduled from interrupt context to complete a
* transfer and call client callback.
* @client: Cliented owned descriptor list.
* @pending_queue: Submitted jobs, to be issued by issue_pending()
* @active: Active descriptor.
* @queue: Queued jobs.
* @prepare_queue: Prepared jobs.
* @dma_cfg: The client configuration of this dma channel.
* @configured: whether the dma_cfg configuration is valid
* @base: Pointer to the device instance struct.
* @src_def_cfg: Default cfg register setting for src.
* @dst_def_cfg: Default cfg register setting for dst.
* @log_def: Default logical channel settings.
* @lcpa: Pointer to dst and src lcpa settings.
* @runtime_addr: runtime configured address.
* @runtime_direction: runtime configured direction.
*
* This struct can either "be" a logical or a physical channel.
*/
struct d40_chan {
spinlock_t lock;
int log_num;
int pending_tx;
bool busy;
struct d40_phy_res *phy_chan;
struct dma_chan chan;
struct tasklet_struct tasklet;
struct list_head client;
struct list_head pending_queue;
struct list_head active;
struct list_head queue;
struct list_head prepare_queue;
struct stedma40_chan_cfg dma_cfg;
bool configured;
struct d40_base *base;
/* Default register configurations */
u32 src_def_cfg;
u32 dst_def_cfg;
struct d40_def_lcsp log_def;
struct d40_log_lli_full *lcpa;
/* Runtime reconfiguration */
dma_addr_t runtime_addr;
enum dma_transfer_direction runtime_direction;
};
/**
* struct d40_base - The big global struct, one for each probe'd instance.
*
* @interrupt_lock: Lock used to make sure one interrupt is handle a time.
* @execmd_lock: Lock for execute command usage since several channels share
* the same physical register.
* @dev: The device structure.
* @virtbase: The virtual base address of the DMA's register.
* @rev: silicon revision detected.
* @clk: Pointer to the DMA clock structure.
* @phy_start: Physical memory start of the DMA registers.
* @phy_size: Size of the DMA register map.
* @irq: The IRQ number.
* @num_phy_chans: The number of physical channels. Read from HW. This
* is the number of available channels for this driver, not counting "Secure
* mode" allocated physical channels.
* @num_log_chans: The number of logical channels. Calculated from
* num_phy_chans.
* @dma_both: dma_device channels that can do both memcpy and slave transfers.
* @dma_slave: dma_device channels that can do only do slave transfers.
* @dma_memcpy: dma_device channels that can do only do memcpy transfers.
* @phy_chans: Room for all possible physical channels in system.
* @log_chans: Room for all possible logical channels in system.
* @lookup_log_chans: Used to map interrupt number to logical channel. Points
* to log_chans entries.
* @lookup_phy_chans: Used to map interrupt number to physical channel. Points
* to phy_chans entries.
* @plat_data: Pointer to provided platform_data which is the driver
* configuration.
* @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
* @phy_res: Vector containing all physical channels.
* @lcla_pool: lcla pool settings and data.
* @lcpa_base: The virtual mapped address of LCPA.
* @phy_lcpa: The physical address of the LCPA.
* @lcpa_size: The size of the LCPA area.
* @desc_slab: cache for descriptors.
* @reg_val_backup: Here the values of some hardware registers are stored
* before the DMA is powered off. They are restored when the power is back on.
* @reg_val_backup_v3: Backup of registers that only exits on dma40 v3 and
* later.
* @reg_val_backup_chan: Backup data for standard channel parameter registers.
* @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off.
* @initialized: true if the dma has been initialized
*/
struct d40_base {
spinlock_t interrupt_lock;
spinlock_t execmd_lock;
struct device *dev;
void __iomem *virtbase;
u8 rev:4;
struct clk *clk;
phys_addr_t phy_start;
resource_size_t phy_size;
int irq;
int num_phy_chans;
int num_log_chans;
struct dma_device dma_both;
struct dma_device dma_slave;
struct dma_device dma_memcpy;
struct d40_chan *phy_chans;
struct d40_chan *log_chans;
struct d40_chan **lookup_log_chans;
struct d40_chan **lookup_phy_chans;
struct stedma40_platform_data *plat_data;
struct regulator *lcpa_regulator;
/* Physical half channels */
struct d40_phy_res *phy_res;
struct d40_lcla_pool lcla_pool;
void *lcpa_base;
dma_addr_t phy_lcpa;
resource_size_t lcpa_size;
struct kmem_cache *desc_slab;
u32 reg_val_backup[BACKUP_REGS_SZ];
u32 reg_val_backup_v3[BACKUP_REGS_SZ_V3];
u32 *reg_val_backup_chan;
u16 gcc_pwr_off_mask;
bool initialized;
};
/**
* struct d40_interrupt_lookup - lookup table for interrupt handler
*
* @src: Interrupt mask register.
* @clr: Interrupt clear register.
* @is_error: true if this is an error interrupt.
* @offset: start delta in the lookup_log_chans in d40_base. If equals to
* D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
*/
struct d40_interrupt_lookup {
u32 src;
u32 clr;
bool is_error;
int offset;
};
/**
* struct d40_reg_val - simple lookup struct
*
* @reg: The register.
* @val: The value that belongs to the register in reg.
*/
struct d40_reg_val {
unsigned int reg;
unsigned int val;
};
static struct device *chan2dev(struct d40_chan *d40c)
{
return &d40c->chan.dev->device;
}
static bool chan_is_physical(struct d40_chan *chan)
{
return chan->log_num == D40_PHY_CHAN;
}
static bool chan_is_logical(struct d40_chan *chan)
{
return !chan_is_physical(chan);
}
static void __iomem *chan_base(struct d40_chan *chan)
{
return chan->base->virtbase + D40_DREG_PCBASE +
chan->phy_chan->num * D40_DREG_PCDELTA;
}
#define d40_err(dev, format, arg...) \
dev_err(dev, "[%s] " format, __func__, ## arg)
#define chan_err(d40c, format, arg...) \
d40_err(chan2dev(d40c), format, ## arg)
static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d,
int lli_len)
{
bool is_log = chan_is_logical(d40c);
u32 align;
void *base;
if (is_log)
align = sizeof(struct d40_log_lli);
else
align = sizeof(struct d40_phy_lli);
if (lli_len == 1) {
base = d40d->lli_pool.pre_alloc_lli;
d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
d40d->lli_pool.base = NULL;
} else {
d40d->lli_pool.size = lli_len * 2 * align;
base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
d40d->lli_pool.base = base;
if (d40d->lli_pool.base == NULL)
return -ENOMEM;
}
if (is_log) {
d40d->lli_log.src = PTR_ALIGN(base, align);
d40d->lli_log.dst = d40d->lli_log.src + lli_len;
d40d->lli_pool.dma_addr = 0;
} else {
d40d->lli_phy.src = PTR_ALIGN(base, align);
d40d->lli_phy.dst = d40d->lli_phy.src + lli_len;
d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev,
d40d->lli_phy.src,
d40d->lli_pool.size,
DMA_TO_DEVICE);
if (dma_mapping_error(d40c->base->dev,
d40d->lli_pool.dma_addr)) {
kfree(d40d->lli_pool.base);
d40d->lli_pool.base = NULL;
d40d->lli_pool.dma_addr = 0;
return -ENOMEM;
}
}
return 0;
}
static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
if (d40d->lli_pool.dma_addr)
dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr,
d40d->lli_pool.size, DMA_TO_DEVICE);
kfree(d40d->lli_pool.base);
d40d->lli_pool.base = NULL;
d40d->lli_pool.size = 0;
d40d->lli_log.src = NULL;
d40d->lli_log.dst = NULL;
d40d->lli_phy.src = NULL;
d40d->lli_phy.dst = NULL;
}
static int d40_lcla_alloc_one(struct d40_chan *d40c,
struct d40_desc *d40d)
{
unsigned long flags;
int i;
int ret = -EINVAL;
int p;
spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
p = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP;
/*
* Allocate both src and dst at the same time, therefore the half
* start on 1 since 0 can't be used since zero is used as end marker.
*/
for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
if (!d40c->base->lcla_pool.alloc_map[p + i]) {
d40c->base->lcla_pool.alloc_map[p + i] = d40d;
d40d->lcla_alloc++;
ret = i;
break;
}
}
spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return ret;
}
static int d40_lcla_free_all(struct d40_chan *d40c,
struct d40_desc *d40d)
{
unsigned long flags;
int i;
int ret = -EINVAL;
if (chan_is_physical(d40c))
return 0;
spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
if (d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num *
D40_LCLA_LINK_PER_EVENT_GRP + i] == d40d) {
d40c->base->lcla_pool.alloc_map[d40c->phy_chan->num *
D40_LCLA_LINK_PER_EVENT_GRP + i] = NULL;
d40d->lcla_alloc--;
if (d40d->lcla_alloc == 0) {
ret = 0;
break;
}
}
}
spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return ret;
}
static void d40_desc_remove(struct d40_desc *d40d)
{
list_del(&d40d->node);
}
static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
{
struct d40_desc *desc = NULL;
if (!list_empty(&d40c->client)) {
struct d40_desc *d;
struct d40_desc *_d;
list_for_each_entry_safe(d, _d, &d40c->client, node) {
if (async_tx_test_ack(&d->txd)) {
d40_desc_remove(d);
desc = d;
memset(desc, 0, sizeof(*desc));
break;
}
}
}
if (!desc)
desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
if (desc)
INIT_LIST_HEAD(&desc->node);
return desc;
}
static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
d40_pool_lli_free(d40c, d40d);
d40_lcla_free_all(d40c, d40d);
kmem_cache_free(d40c->base->desc_slab, d40d);
}
static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
{
list_add_tail(&desc->node, &d40c->active);
}
static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc)
{
struct d40_phy_lli *lli_dst = desc->lli_phy.dst;
struct d40_phy_lli *lli_src = desc->lli_phy.src;
void __iomem *base = chan_base(chan);
writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG);
writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT);
writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR);
writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK);
writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG);
writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT);
writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR);
writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK);
}
static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
{
struct d40_lcla_pool *pool = &chan->base->lcla_pool;
struct d40_log_lli_bidir *lli = &desc->lli_log;
int lli_current = desc->lli_current;
int lli_len = desc->lli_len;
bool cyclic = desc->cyclic;
int curr_lcla = -EINVAL;
int first_lcla = 0;
bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
bool linkback;
/*
* We may have partially running cyclic transfers, in case we did't get
* enough LCLA entries.
*/
linkback = cyclic && lli_current == 0;
/*
* For linkback, we need one LCLA even with only one link, because we
* can't link back to the one in LCPA space
*/
if (linkback || (lli_len - lli_current > 1)) {
curr_lcla = d40_lcla_alloc_one(chan, desc);
first_lcla = curr_lcla;
}
/*
* For linkback, we normally load the LCPA in the loop since we need to
* link it to the second LCLA and not the first. However, if we
* couldn't even get a first LCLA, then we have to run in LCPA and
* reload manually.
*/
if (!linkback || curr_lcla == -EINVAL) {
unsigned int flags = 0;
if (curr_lcla == -EINVAL)
flags |= LLI_TERM_INT;
d40_log_lli_lcpa_write(chan->lcpa,
&lli->dst[lli_current],
&lli->src[lli_current],
curr_lcla,
flags);
lli_current++;
}
if (curr_lcla < 0)
goto out;
for (; lli_current < lli_len; lli_current++) {
unsigned int lcla_offset = chan->phy_chan->num * 1024 +
8 * curr_lcla * 2;
struct d40_log_lli *lcla = pool->base + lcla_offset;
unsigned int flags = 0;
int next_lcla;
if (lli_current + 1 < lli_len)
next_lcla = d40_lcla_alloc_one(chan, desc);
else
next_lcla = linkback ? first_lcla : -EINVAL;
if (cyclic || next_lcla == -EINVAL)
flags |= LLI_TERM_INT;
if (linkback && curr_lcla == first_lcla) {
/* First link goes in both LCPA and LCLA */
d40_log_lli_lcpa_write(chan->lcpa,
&lli->dst[lli_current],
&lli->src[lli_current],
next_lcla, flags);
}
/*
* One unused LCLA in the cyclic case if the very first
* next_lcla fails...
*/
d40_log_lli_lcla_write(lcla,
&lli->dst[lli_current],
&lli->src[lli_current],
next_lcla, flags);
/*
* Cache maintenance is not needed if lcla is
* mapped in esram
*/
if (!use_esram_lcla) {
dma_sync_single_range_for_device(chan->base->dev,
pool->dma_addr, lcla_offset,
2 * sizeof(struct d40_log_lli),
DMA_TO_DEVICE);
}
curr_lcla = next_lcla;
if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
lli_current++;
break;
}
}
out:
desc->lli_current = lli_current;
}
static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
{
if (chan_is_physical(d40c)) {
d40_phy_lli_load(d40c, d40d);
d40d->lli_current = d40d->lli_len;
} else
d40_log_lli_to_lcxa(d40c, d40d);
}
static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
{
struct d40_desc *d;
if (list_empty(&d40c->active))
return NULL;
d = list_first_entry(&d40c->active,
struct d40_desc,
node);
return d;
}
/* remove desc from current queue and add it to the pending_queue */
static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
{
d40_desc_remove(desc);
desc->is_in_client_list = false;
list_add_tail(&desc->node, &d40c->pending_queue);
}
static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
{
struct d40_desc *d;
if (list_empty(&d40c->pending_queue))
return NULL;
d = list_first_entry(&d40c->pending_queue,
struct d40_desc,
node);
return d;
}
static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
{
struct d40_desc *d;
if (list_empty(&d40c->queue))
return NULL;
d = list_first_entry(&d40c->queue,
struct d40_desc,
node);
return d;
}
static int d40_psize_2_burst_size(bool is_log, int psize)
{
if (is_log) {
if (psize == STEDMA40_PSIZE_LOG_1)
return 1;
} else {
if (psize == STEDMA40_PSIZE_PHY_1)
return 1;
}
return 2 << psize;
}
/*
* The dma only supports transmitting packages up to
* STEDMA40_MAX_SEG_SIZE << data_width. Calculate the total number of
* dma elements required to send the entire sg list
*/
static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
{
int dmalen;
u32 max_w = max(data_width1, data_width2);
u32 min_w = min(data_width1, data_width2);
u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
if (seg_max > STEDMA40_MAX_SEG_SIZE)
seg_max -= (1 << max_w);
if (!IS_ALIGNED(size, 1 << max_w))
return -EINVAL;
if (size <= seg_max)
dmalen = 1;
else {
dmalen = size / seg_max;
if (dmalen * seg_max < size)
dmalen++;
}
return dmalen;
}
static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len,
u32 data_width1, u32 data_width2)
{
struct scatterlist *sg;
int i;
int len = 0;
int ret;
for_each_sg(sgl, sg, sg_len, i) {
ret = d40_size_2_dmalen(sg_dma_len(sg),
data_width1, data_width2);
if (ret < 0)
return ret;
len += ret;
}
return len;
}
#ifdef CONFIG_PM
static void dma40_backup(void __iomem *baseaddr, u32 *backup,
u32 *regaddr, int num, bool save)
{
int i;
for (i = 0; i < num; i++) {
void __iomem *addr = baseaddr + regaddr[i];
if (save)
backup[i] = readl_relaxed(addr);
else
writel_relaxed(backup[i], addr);
}
}
static void d40_save_restore_registers(struct d40_base *base, bool save)
{
int i;
/* Save/Restore channel specific registers */
for (i = 0; i < base->num_phy_chans; i++) {
void __iomem *addr;
int idx;
if (base->phy_res[i].reserved)
continue;
addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA;
idx = i * ARRAY_SIZE(d40_backup_regs_chan);
dma40_backup(addr, &base->reg_val_backup_chan[idx],
d40_backup_regs_chan,
ARRAY_SIZE(d40_backup_regs_chan),
save);
}
/* Save/Restore global registers */
dma40_backup(base->virtbase, base->reg_val_backup,
d40_backup_regs, ARRAY_SIZE(d40_backup_regs),
save);
/* Save/Restore registers only existing on dma40 v3 and later */
if (base->rev >= 3)
dma40_backup(base->virtbase, base->reg_val_backup_v3,
d40_backup_regs_v3,
ARRAY_SIZE(d40_backup_regs_v3),
save);
}
#else
static void d40_save_restore_registers(struct d40_base *base, bool save)
{
}
#endif
static int __d40_execute_command_phy(struct d40_chan *d40c,
enum d40_command command)
{
u32 status;
int i;
void __iomem *active_reg;
int ret = 0;
unsigned long flags;
u32 wmask;
if (command == D40_DMA_STOP) {
ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ);
if (ret)
return ret;
}
spin_lock_irqsave(&d40c->base->execmd_lock, flags);
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
if (command == D40_DMA_SUSPEND_REQ) {
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
goto done;
}
wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
active_reg);
if (command == D40_DMA_SUSPEND_REQ) {
for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
cpu_relax();
/*
* Reduce the number of bus accesses while
* waiting for the DMA to suspend.
*/
udelay(3);
if (status == D40_DMA_STOP ||
status == D40_DMA_SUSPENDED)
break;
}
if (i == D40_SUSPEND_MAX_IT) {
chan_err(d40c,
"unable to suspend the chl %d (log: %d) status %x\n",
d40c->phy_chan->num, d40c->log_num,
status);
dump_stack();
ret = -EBUSY;
}
}
done:
spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
return ret;
}
static void d40_term_all(struct d40_chan *d40c)
{
struct d40_desc *d40d;
struct d40_desc *_d;
/* Release active descriptors */
while ((d40d = d40_first_active_get(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release queued descriptors waiting for transfer */
while ((d40d = d40_first_queued(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release pending descriptors */
while ((d40d = d40_first_pending(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release client owned descriptors */
if (!list_empty(&d40c->client))
list_for_each_entry_safe(d40d, _d, &d40c->client, node) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release descriptors in prepare queue */
if (!list_empty(&d40c->prepare_queue))
list_for_each_entry_safe(d40d, _d,
&d40c->prepare_queue, node) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
d40c->pending_tx = 0;
}
static void __d40_config_set_event(struct d40_chan *d40c,
enum d40_events event_type, u32 event,
int reg)
{
void __iomem *addr = chan_base(d40c) + reg;
int tries;
u32 status;
switch (event_type) {
case D40_DEACTIVATE_EVENTLINE:
writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event))
| ~D40_EVENTLINE_MASK(event), addr);
break;
case D40_SUSPEND_REQ_EVENTLINE:
status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
if (status == D40_DEACTIVATE_EVENTLINE ||
status == D40_SUSPEND_REQ_EVENTLINE)
break;
writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event))
| ~D40_EVENTLINE_MASK(event), addr);
for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) {
status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
cpu_relax();
/*
* Reduce the number of bus accesses while
* waiting for the DMA to suspend.
*/
udelay(3);
if (status == D40_DEACTIVATE_EVENTLINE)
break;
}
if (tries == D40_SUSPEND_MAX_IT) {
chan_err(d40c,
"unable to stop the event_line chl %d (log: %d)"
"status %x\n", d40c->phy_chan->num,
d40c->log_num, status);
}
break;
case D40_ACTIVATE_EVENTLINE:
/*
* The hardware sometimes doesn't register the enable when src and dst
* event lines are active on the same logical channel. Retry to ensure
* it does. Usually only one retry is sufficient.
*/
tries = 100;
while (--tries) {
writel((D40_ACTIVATE_EVENTLINE <<
D40_EVENTLINE_POS(event)) |
~D40_EVENTLINE_MASK(event), addr);
if (readl(addr) & D40_EVENTLINE_MASK(event))
break;
}
if (tries != 99)
dev_dbg(chan2dev(d40c),
"[%s] workaround enable S%cLNK (%d tries)\n",
__func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D',
100 - tries);
WARN_ON(!tries);
break;
case D40_ROUND_EVENTLINE:
BUG();
break;
}
}
static void d40_config_set_event(struct d40_chan *d40c,
enum d40_events event_type)
{
/* Enable event line connected to device (or memcpy) */
if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) ||
(d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) {
u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SSLNK);
}
if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) {
u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SDLNK);
}
}
static u32 d40_chan_has_events(struct d40_chan *d40c)
{
void __iomem *chanbase = chan_base(d40c);
u32 val;
val = readl(chanbase + D40_CHAN_REG_SSLNK);
val |= readl(chanbase + D40_CHAN_REG_SDLNK);
return val;
}
static int
__d40_execute_command_log(struct d40_chan *d40c, enum d40_command command)
{
unsigned long flags;
int ret = 0;
u32 active_status;
void __iomem *active_reg;
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
spin_lock_irqsave(&d40c->phy_chan->lock, flags);
switch (command) {
case D40_DMA_STOP:
case D40_DMA_SUSPEND_REQ:
active_status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (active_status == D40_DMA_RUN)
d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE);
else
d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE);
if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP))
ret = __d40_execute_command_phy(d40c, command);
break;
case D40_DMA_RUN:
d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE);
ret = __d40_execute_command_phy(d40c, command);
break;
case D40_DMA_SUSPENDED:
BUG();
break;
}
spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
return ret;
}
static int d40_channel_execute_command(struct d40_chan *d40c,
enum d40_command command)
{
if (chan_is_logical(d40c))
return __d40_execute_command_log(d40c, command);
else
return __d40_execute_command_phy(d40c, command);
}
static u32 d40_get_prmo(struct d40_chan *d40c)
{
static const unsigned int phy_map[] = {
[STEDMA40_PCHAN_BASIC_MODE]
= D40_DREG_PRMO_PCHAN_BASIC,
[STEDMA40_PCHAN_MODULO_MODE]
= D40_DREG_PRMO_PCHAN_MODULO,
[STEDMA40_PCHAN_DOUBLE_DST_MODE]
= D40_DREG_PRMO_PCHAN_DOUBLE_DST,
};
static const unsigned int log_map[] = {
[STEDMA40_LCHAN_SRC_PHY_DST_LOG]
= D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG,
[STEDMA40_LCHAN_SRC_LOG_DST_PHY]
= D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY,
[STEDMA40_LCHAN_SRC_LOG_DST_LOG]
= D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG,
};
if (chan_is_physical(d40c))
return phy_map[d40c->dma_cfg.mode_opt];
else
return log_map[d40c->dma_cfg.mode_opt];
}
static void d40_config_write(struct d40_chan *d40c)
{
u32 addr_base;
u32 var;
/* Odd addresses are even addresses + 4 */
addr_base = (d40c->phy_chan->num % 2) * 4;
/* Setup channel mode to logical or physical */
var = ((u32)(chan_is_logical(d40c)) + 1) <<
D40_CHAN_POS(d40c->phy_chan->num);
writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
/* Setup operational mode option register */
var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num);
writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
if (chan_is_logical(d40c)) {
int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS)
& D40_SREG_ELEM_LOG_LIDX_MASK;
void __iomem *chanbase = chan_base(d40c);
/* Set default config for CFG reg */
writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG);
writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG);
/* Set LIDX for lcla */
writel(lidx, chanbase + D40_CHAN_REG_SSELT);
writel(lidx, chanbase + D40_CHAN_REG_SDELT);
/* Clear LNK which will be used by d40_chan_has_events() */
writel(0, chanbase + D40_CHAN_REG_SSLNK);
writel(0, chanbase + D40_CHAN_REG_SDLNK);
}
}
static u32 d40_residue(struct d40_chan *d40c)
{
u32 num_elt;
if (chan_is_logical(d40c))
num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
>> D40_MEM_LCSP2_ECNT_POS;
else {
u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT);
num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK)
>> D40_SREG_ELEM_PHY_ECNT_POS;
}
return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
}
static bool d40_tx_is_linked(struct d40_chan *d40c)
{
bool is_link;
if (chan_is_logical(d40c))
is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK;
else
is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK)
& D40_SREG_LNK_PHYS_LNK_MASK;
return is_link;
}
static int d40_pause(struct d40_chan *d40c)
{
int res = 0;
unsigned long flags;
if (!d40c->busy)
return 0;
pm_runtime_get_sync(d40c->base->dev);
spin_lock_irqsave(&d40c->lock, flags);
res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
static int d40_resume(struct d40_chan *d40c)
{
int res = 0;
unsigned long flags;
if (!d40c->busy)
return 0;
spin_lock_irqsave(&d40c->lock, flags);
pm_runtime_get_sync(d40c->base->dev);
/* If bytes left to transfer or linked tx resume job */
if (d40_residue(d40c) || d40_tx_is_linked(d40c))
res = d40_channel_execute_command(d40c, D40_DMA_RUN);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct d40_chan *d40c = container_of(tx->chan,
struct d40_chan,
chan);
struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&d40c->lock, flags);
cookie = dma_cookie_assign(tx);
d40_desc_queue(d40c, d40d);
spin_unlock_irqrestore(&d40c->lock, flags);
return cookie;
}
static int d40_start(struct d40_chan *d40c)
{
return d40_channel_execute_command(d40c, D40_DMA_RUN);
}
static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
{
struct d40_desc *d40d;
int err;
/* Start queued jobs, if any */
d40d = d40_first_queued(d40c);
if (d40d != NULL) {
if (!d40c->busy) {
d40c->busy = true;
pm_runtime_get_sync(d40c->base->dev);
}
/* Remove from queue */
d40_desc_remove(d40d);
/* Add to active queue */
d40_desc_submit(d40c, d40d);
/* Initiate DMA job */
d40_desc_load(d40c, d40d);
/* Start dma job */
err = d40_start(d40c);
if (err)
return NULL;
}
return d40d;
}
/* called from interrupt context */
static void dma_tc_handle(struct d40_chan *d40c)
{
struct d40_desc *d40d;
/* Get first active entry from list */
d40d = d40_first_active_get(d40c);
if (d40d == NULL)
return;
if (d40d->cyclic) {
/*
* If this was a paritially loaded list, we need to reloaded
* it, and only when the list is completed. We need to check
* for done because the interrupt will hit for every link, and
* not just the last one.
*/
if (d40d->lli_current < d40d->lli_len
&& !d40_tx_is_linked(d40c)
&& !d40_residue(d40c)) {
d40_lcla_free_all(d40c, d40d);
d40_desc_load(d40c, d40d);
(void) d40_start(d40c);
if (d40d->lli_current == d40d->lli_len)
d40d->lli_current = 0;
}
} else {
d40_lcla_free_all(d40c, d40d);
if (d40d->lli_current < d40d->lli_len) {
d40_desc_load(d40c, d40d);
/* Start dma job */
(void) d40_start(d40c);
return;
}
if (d40_queue_start(d40c) == NULL)
d40c->busy = false;
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40c->pending_tx++;
tasklet_schedule(&d40c->tasklet);
}
static void dma_tasklet(unsigned long data)
{
struct d40_chan *d40c = (struct d40_chan *) data;
struct d40_desc *d40d;
unsigned long flags;
dma_async_tx_callback callback;
void *callback_param;
spin_lock_irqsave(&d40c->lock, flags);
/* Get first active entry from list */
d40d = d40_first_active_get(d40c);
if (d40d == NULL)
goto err;
if (!d40d->cyclic)
dma_cookie_complete(&d40d->txd);
/*
* If terminating a channel pending_tx is set to zero.
* This prevents any finished active jobs to return to the client.
*/
if (d40c->pending_tx == 0) {
spin_unlock_irqrestore(&d40c->lock, flags);
return;
}
/* Callback to client */
callback = d40d->txd.callback;
callback_param = d40d->txd.callback_param;
if (!d40d->cyclic) {
if (async_tx_test_ack(&d40d->txd)) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
} else {
if (!d40d->is_in_client_list) {
d40_desc_remove(d40d);
d40_lcla_free_all(d40c, d40d);
list_add_tail(&d40d->node, &d40c->client);
d40d->is_in_client_list = true;
}
}
}
d40c->pending_tx--;
if (d40c->pending_tx)
tasklet_schedule(&d40c->tasklet);
spin_unlock_irqrestore(&d40c->lock, flags);
if (callback && (d40d->txd.flags & DMA_PREP_INTERRUPT))
callback(callback_param);
return;
err:
/* Rescue manouver if receiving double interrupts */
if (d40c->pending_tx > 0)
d40c->pending_tx--;
spin_unlock_irqrestore(&d40c->lock, flags);
}
static irqreturn_t d40_handle_interrupt(int irq, void *data)
{
static const struct d40_interrupt_lookup il[] = {
{D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0},
{D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
{D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
{D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
{D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0},
{D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32},
{D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64},
{D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96},
{D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN},
{D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN},
};
int i;
u32 regs[ARRAY_SIZE(il)];
u32 idx;
u32 row;
long chan = -1;
struct d40_chan *d40c;
unsigned long flags;
struct d40_base *base = data;
spin_lock_irqsave(&base->interrupt_lock, flags);
/* Read interrupt status of both logical and physical channels */
for (i = 0; i < ARRAY_SIZE(il); i++)
regs[i] = readl(base->virtbase + il[i].src);
for (;;) {
chan = find_next_bit((unsigned long *)regs,
BITS_PER_LONG * ARRAY_SIZE(il), chan + 1);
/* No more set bits found? */
if (chan == BITS_PER_LONG * ARRAY_SIZE(il))
break;
row = chan / BITS_PER_LONG;
idx = chan & (BITS_PER_LONG - 1);
/* ACK interrupt */
writel(1 << idx, base->virtbase + il[row].clr);
if (il[row].offset == D40_PHY_CHAN)
d40c = base->lookup_phy_chans[idx];
else
d40c = base->lookup_log_chans[il[row].offset + idx];
spin_lock(&d40c->lock);
if (!il[row].is_error)
dma_tc_handle(d40c);
else
d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n",
chan, il[row].offset, idx);
spin_unlock(&d40c->lock);
}
spin_unlock_irqrestore(&base->interrupt_lock, flags);
return IRQ_HANDLED;
}
static int d40_validate_conf(struct d40_chan *d40c,
struct stedma40_chan_cfg *conf)
{
int res = 0;
u32 dst_event_group = D40_TYPE_TO_GROUP(conf->dst_dev_type);
u32 src_event_group = D40_TYPE_TO_GROUP(conf->src_dev_type);
bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
if (!conf->dir) {
chan_err(d40c, "Invalid direction.\n");
res = -EINVAL;
}
if (conf->dst_dev_type != STEDMA40_DEV_DST_MEMORY &&
d40c->base->plat_data->dev_tx[conf->dst_dev_type] == 0 &&
d40c->runtime_addr == 0) {
chan_err(d40c, "Invalid TX channel address (%d)\n",
conf->dst_dev_type);
res = -EINVAL;
}
if (conf->src_dev_type != STEDMA40_DEV_SRC_MEMORY &&
d40c->base->plat_data->dev_rx[conf->src_dev_type] == 0 &&
d40c->runtime_addr == 0) {
chan_err(d40c, "Invalid RX channel address (%d)\n",
conf->src_dev_type);
res = -EINVAL;
}
if (conf->dir == STEDMA40_MEM_TO_PERIPH &&
dst_event_group == STEDMA40_DEV_DST_MEMORY) {
chan_err(d40c, "Invalid dst\n");
res = -EINVAL;
}
if (conf->dir == STEDMA40_PERIPH_TO_MEM &&
src_event_group == STEDMA40_DEV_SRC_MEMORY) {
chan_err(d40c, "Invalid src\n");
res = -EINVAL;
}
if (src_event_group == STEDMA40_DEV_SRC_MEMORY &&
dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) {
chan_err(d40c, "No event line\n");
res = -EINVAL;
}
if (conf->dir == STEDMA40_PERIPH_TO_PERIPH &&
(src_event_group != dst_event_group)) {
chan_err(d40c, "Invalid event group\n");
res = -EINVAL;
}
if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) {
/*
* DMAC HW supports it. Will be added to this driver,
* in case any dma client requires it.
*/
chan_err(d40c, "periph to periph not supported\n");
res = -EINVAL;
}
if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
(1 << conf->src_info.data_width) !=
d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
(1 << conf->dst_info.data_width)) {
/*
* The DMAC hardware only supports
* src (burst x width) == dst (burst x width)
*/
chan_err(d40c, "src (burst x width) != dst (burst x width)\n");
res = -EINVAL;
}
return res;
}
static bool d40_alloc_mask_set(struct d40_phy_res *phy,
bool is_src, int log_event_line, bool is_log,
bool *first_user)
{
unsigned long flags;
spin_lock_irqsave(&phy->lock, flags);
*first_user = ((phy->allocated_src | phy->allocated_dst)
== D40_ALLOC_FREE);
if (!is_log) {
/* Physical interrupts are masked per physical full channel */
if (phy->allocated_src == D40_ALLOC_FREE &&
phy->allocated_dst == D40_ALLOC_FREE) {
phy->allocated_dst = D40_ALLOC_PHY;
phy->allocated_src = D40_ALLOC_PHY;
goto found;
} else
goto not_found;
}
/* Logical channel */
if (is_src) {
if (phy->allocated_src == D40_ALLOC_PHY)
goto not_found;
if (phy->allocated_src == D40_ALLOC_FREE)
phy->allocated_src = D40_ALLOC_LOG_FREE;
if (!(phy->allocated_src & (1 << log_event_line))) {
phy->allocated_src |= 1 << log_event_line;
goto found;
} else
goto not_found;
} else {
if (phy->allocated_dst == D40_ALLOC_PHY)
goto not_found;
if (phy->allocated_dst == D40_ALLOC_FREE)
phy->allocated_dst = D40_ALLOC_LOG_FREE;
if (!(phy->allocated_dst & (1 << log_event_line))) {
phy->allocated_dst |= 1 << log_event_line;
goto found;
} else
goto not_found;
}
not_found:
spin_unlock_irqrestore(&phy->lock, flags);
return false;
found:
spin_unlock_irqrestore(&phy->lock, flags);
return true;
}
static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
int log_event_line)
{
unsigned long flags;
bool is_free = false;
spin_lock_irqsave(&phy->lock, flags);
if (!log_event_line) {
phy->allocated_dst = D40_ALLOC_FREE;
phy->allocated_src = D40_ALLOC_FREE;
is_free = true;
goto out;
}
/* Logical channel */
if (is_src) {
phy->allocated_src &= ~(1 << log_event_line);
if (phy->allocated_src == D40_ALLOC_LOG_FREE)
phy->allocated_src = D40_ALLOC_FREE;
} else {
phy->allocated_dst &= ~(1 << log_event_line);
if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
phy->allocated_dst = D40_ALLOC_FREE;
}
is_free = ((phy->allocated_src | phy->allocated_dst) ==
D40_ALLOC_FREE);
out:
spin_unlock_irqrestore(&phy->lock, flags);
return is_free;
}
static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
{
int dev_type;
int event_group;
int event_line;
struct d40_phy_res *phys;
int i;
int j;
int log_num;
bool is_src;
bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL;
phys = d40c->base->phy_res;
if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
dev_type = d40c->dma_cfg.src_dev_type;
log_num = 2 * dev_type;
is_src = true;
} else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
/* dst event lines are used for logical memcpy */
dev_type = d40c->dma_cfg.dst_dev_type;
log_num = 2 * dev_type + 1;
is_src = false;
} else
return -EINVAL;
event_group = D40_TYPE_TO_GROUP(dev_type);
event_line = D40_TYPE_TO_EVENT(dev_type);
if (!is_log) {
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
/* Find physical half channel */
for (i = 0; i < d40c->base->num_phy_chans; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
0, is_log,
first_phy_user))
goto found_phy;
}
} else
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
for (i = phy_num; i < phy_num + 2; i++) {
if (d40_alloc_mask_set(&phys[i],
is_src,
0,
is_log,
first_phy_user))
goto found_phy;
}
}
return -EINVAL;
found_phy:
d40c->phy_chan = &phys[i];
d40c->log_num = D40_PHY_CHAN;
goto out;
}
if (dev_type == -1)
return -EINVAL;
/* Find logical channel */
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
if (d40c->dma_cfg.use_fixed_channel) {
i = d40c->dma_cfg.phy_channel;
if ((i != phy_num) && (i != phy_num + 1)) {
dev_err(chan2dev(d40c),
"invalid fixed phy channel %d\n", i);
return -EINVAL;
}
if (d40_alloc_mask_set(&phys[i], is_src, event_line,
is_log, first_phy_user))
goto found_log;
dev_err(chan2dev(d40c),
"could not allocate fixed phy channel %d\n", i);
return -EINVAL;
}
/*
* Spread logical channels across all available physical rather
* than pack every logical channel at the first available phy
* channels.
*/
if (is_src) {
for (i = phy_num; i < phy_num + 2; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log,
first_phy_user))
goto found_log;
}
} else {
for (i = phy_num + 1; i >= phy_num; i--) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log,
first_phy_user))
goto found_log;
}
}
}
return -EINVAL;
found_log:
d40c->phy_chan = &phys[i];
d40c->log_num = log_num;
out:
if (is_log)
d40c->base->lookup_log_chans[d40c->log_num] = d40c;
else
d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
return 0;
}
static int d40_config_memcpy(struct d40_chan *d40c)
{
dma_cap_mask_t cap = d40c->chan.device->cap_mask;
if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_log;
d40c->dma_cfg.src_dev_type = STEDMA40_DEV_SRC_MEMORY;
d40c->dma_cfg.dst_dev_type = d40c->base->plat_data->
memcpy[d40c->chan.chan_id];
} else if (dma_has_cap(DMA_MEMCPY, cap) &&
dma_has_cap(DMA_SLAVE, cap)) {
d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_phy;
} else {
chan_err(d40c, "No memcpy\n");
return -EINVAL;
}
return 0;
}
static int d40_free_dma(struct d40_chan *d40c)
{
int res = 0;
u32 event;
struct d40_phy_res *phy = d40c->phy_chan;
bool is_src;
/* Terminate all queued and active transfers */
d40_term_all(d40c);
if (phy == NULL) {
chan_err(d40c, "phy == null\n");
return -EINVAL;
}
if (phy->allocated_src == D40_ALLOC_FREE &&
phy->allocated_dst == D40_ALLOC_FREE) {
chan_err(d40c, "channel already free\n");
return -EINVAL;
}
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
is_src = false;
} else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
is_src = true;
} else {
chan_err(d40c, "Unknown direction\n");
return -EINVAL;
}
pm_runtime_get_sync(d40c->base->dev);
res = d40_channel_execute_command(d40c, D40_DMA_STOP);
if (res) {
chan_err(d40c, "stop failed\n");
goto out;
}
d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0);
if (chan_is_logical(d40c))
d40c->base->lookup_log_chans[d40c->log_num] = NULL;
else
d40c->base->lookup_phy_chans[phy->num] = NULL;
if (d40c->busy) {
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40c->busy = false;
d40c->phy_chan = NULL;
d40c->configured = false;
out:
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
return res;
}
static bool d40_is_paused(struct d40_chan *d40c)
{
void __iomem *chanbase = chan_base(d40c);
bool is_paused = false;
unsigned long flags;
void __iomem *active_reg;
u32 status;
u32 event;
spin_lock_irqsave(&d40c->lock, flags);
if (chan_is_physical(d40c)) {
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
is_paused = true;
goto _exit;
}
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
status = readl(chanbase + D40_CHAN_REG_SDLNK);
} else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
status = readl(chanbase + D40_CHAN_REG_SSLNK);
} else {
chan_err(d40c, "Unknown direction\n");
goto _exit;
}
status = (status & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
if (status != D40_DMA_RUN)
is_paused = true;
_exit:
spin_unlock_irqrestore(&d40c->lock, flags);
return is_paused;
}
static u32 stedma40_residue(struct dma_chan *chan)
{
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
u32 bytes_left;
unsigned long flags;
spin_lock_irqsave(&d40c->lock, flags);
bytes_left = d40_residue(d40c);
spin_unlock_irqrestore(&d40c->lock, flags);
return bytes_left;
}
static int
d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc,
struct scatterlist *sg_src, struct scatterlist *sg_dst,
unsigned int sg_len, dma_addr_t src_dev_addr,
dma_addr_t dst_dev_addr)
{
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
struct stedma40_half_channel_info *src_info = &cfg->src_info;
struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
int ret;
ret = d40_log_sg_to_lli(sg_src, sg_len,
src_dev_addr,
desc->lli_log.src,
chan->log_def.lcsp1,
src_info->data_width,
dst_info->data_width);
ret = d40_log_sg_to_lli(sg_dst, sg_len,
dst_dev_addr,
desc->lli_log.dst,
chan->log_def.lcsp3,
dst_info->data_width,
src_info->data_width);
return ret < 0 ? ret : 0;
}
static int
d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc,
struct scatterlist *sg_src, struct scatterlist *sg_dst,
unsigned int sg_len, dma_addr_t src_dev_addr,
dma_addr_t dst_dev_addr)
{
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
struct stedma40_half_channel_info *src_info = &cfg->src_info;
struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
unsigned long flags = 0;
int ret;
if (desc->cyclic)
flags |= LLI_CYCLIC | LLI_TERM_INT;
ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr,
desc->lli_phy.src,
virt_to_phys(desc->lli_phy.src),
chan->src_def_cfg,
src_info, dst_info, flags);
ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr,
desc->lli_phy.dst,
virt_to_phys(desc->lli_phy.dst),
chan->dst_def_cfg,
dst_info, src_info, flags);
dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr,
desc->lli_pool.size, DMA_TO_DEVICE);
return ret < 0 ? ret : 0;
}
static struct d40_desc *
d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg,
unsigned int sg_len, unsigned long dma_flags)
{
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
struct d40_desc *desc;
int ret;
desc = d40_desc_get(chan);
if (!desc)
return NULL;
desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width,
cfg->dst_info.data_width);
if (desc->lli_len < 0) {
chan_err(chan, "Unaligned size\n");
goto err;
}
ret = d40_pool_lli_alloc(chan, desc, desc->lli_len);
if (ret < 0) {
chan_err(chan, "Could not allocate lli\n");
goto err;
}
desc->lli_current = 0;
desc->txd.flags = dma_flags;
desc->txd.tx_submit = d40_tx_submit;
dma_async_tx_descriptor_init(&desc->txd, &chan->chan);
return desc;
err:
d40_desc_free(chan, desc);
return NULL;
}
static dma_addr_t
d40_get_dev_addr(struct d40_chan *chan, enum dma_transfer_direction direction)
{
struct stedma40_platform_data *plat = chan->base->plat_data;
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
dma_addr_t addr = 0;
if (chan->runtime_addr)
return chan->runtime_addr;
if (direction == DMA_DEV_TO_MEM)
addr = plat->dev_rx[cfg->src_dev_type];
else if (direction == DMA_MEM_TO_DEV)
addr = plat->dev_tx[cfg->dst_dev_type];
return addr;
}
static struct dma_async_tx_descriptor *
d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
struct scatterlist *sg_dst, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long dma_flags)
{
struct d40_chan *chan = container_of(dchan, struct d40_chan, chan);
dma_addr_t src_dev_addr = 0;
dma_addr_t dst_dev_addr = 0;
struct d40_desc *desc;
unsigned long flags;
int ret;
if (!chan->phy_chan) {
chan_err(chan, "Cannot prepare unallocated channel\n");
return NULL;
}
spin_lock_irqsave(&chan->lock, flags);
desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags);
if (desc == NULL)
goto err;
if (sg_next(&sg_src[sg_len - 1]) == sg_src)
desc->cyclic = true;
if (direction != DMA_TRANS_NONE) {
dma_addr_t dev_addr = d40_get_dev_addr(chan, direction);
if (direction == DMA_DEV_TO_MEM)
src_dev_addr = dev_addr;
else if (direction == DMA_MEM_TO_DEV)
dst_dev_addr = dev_addr;
}
if (chan_is_logical(chan))
ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
sg_len, src_dev_addr, dst_dev_addr);
else
ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst,
sg_len, src_dev_addr, dst_dev_addr);
if (ret) {
chan_err(chan, "Failed to prepare %s sg job: %d\n",
chan_is_logical(chan) ? "log" : "phy", ret);
goto err;
}
/*
* add descriptor to the prepare queue in order to be able
* to free them later in terminate_all
*/
list_add_tail(&desc->node, &chan->prepare_queue);
spin_unlock_irqrestore(&chan->lock, flags);
return &desc->txd;
err:
if (desc)
d40_desc_free(chan, desc);
spin_unlock_irqrestore(&chan->lock, flags);
return NULL;
}
bool stedma40_filter(struct dma_chan *chan, void *data)
{
struct stedma40_chan_cfg *info = data;
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
int err;
if (data) {
err = d40_validate_conf(d40c, info);
if (!err)
d40c->dma_cfg = *info;
} else
err = d40_config_memcpy(d40c);
if (!err)
d40c->configured = true;
return err == 0;
}
EXPORT_SYMBOL(stedma40_filter);
static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
{
bool realtime = d40c->dma_cfg.realtime;
bool highprio = d40c->dma_cfg.high_priority;
u32 prioreg = highprio ? D40_DREG_PSEG1 : D40_DREG_PCEG1;
u32 rtreg = realtime ? D40_DREG_RSEG1 : D40_DREG_RCEG1;
u32 event = D40_TYPE_TO_EVENT(dev_type);
u32 group = D40_TYPE_TO_GROUP(dev_type);
u32 bit = 1 << event;
/* Destination event lines are stored in the upper halfword */
if (!src)
bit <<= 16;
writel(bit, d40c->base->virtbase + prioreg + group * 4);
writel(bit, d40c->base->virtbase + rtreg + group * 4);
}
static void d40_set_prio_realtime(struct d40_chan *d40c)
{
if (d40c->base->rev < 3)
return;
if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) ||
(d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
__d40_set_prio_rt(d40c, d40c->dma_cfg.src_dev_type, true);
if ((d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH) ||
(d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
__d40_set_prio_rt(d40c, d40c->dma_cfg.dst_dev_type, false);
}
/* DMA ENGINE functions */
static int d40_alloc_chan_resources(struct dma_chan *chan)
{
int err;
unsigned long flags;
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
bool is_free_phy;
spin_lock_irqsave(&d40c->lock, flags);
dma_cookie_init(chan);
/* If no dma configuration is set use default configuration (memcpy) */
if (!d40c->configured) {
err = d40_config_memcpy(d40c);
if (err) {
chan_err(d40c, "Failed to configure memcpy channel\n");
goto fail;
}
}
err = d40_allocate_channel(d40c, &is_free_phy);
if (err) {
chan_err(d40c, "Failed to allocate channel\n");
d40c->configured = false;
goto fail;
}
pm_runtime_get_sync(d40c->base->dev);
/* Fill in basic CFG register values */
d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
&d40c->dst_def_cfg, chan_is_logical(d40c));
d40_set_prio_realtime(d40c);
if (chan_is_logical(d40c)) {
d40_log_cfg(&d40c->dma_cfg,
&d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
d40c->lcpa = d40c->base->lcpa_base +
d40c->dma_cfg.src_dev_type * D40_LCPA_CHAN_SIZE;
else
d40c->lcpa = d40c->base->lcpa_base +
d40c->dma_cfg.dst_dev_type *
D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
}
dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
chan_is_logical(d40c) ? "logical" : "physical",
d40c->phy_chan->num,
d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
/*
* Only write channel configuration to the DMA if the physical
* resource is free. In case of multiple logical channels
* on the same physical resource, only the first write is necessary.
*/
if (is_free_phy)
d40_config_write(d40c);
fail:
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return err;
}
static void d40_free_chan_resources(struct dma_chan *chan)
{
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
int err;
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Cannot free unallocated channel\n");
return;
}
spin_lock_irqsave(&d40c->lock, flags);
err = d40_free_dma(d40c);
if (err)
chan_err(d40c, "Failed to free channel\n");
spin_unlock_irqrestore(&d40c->lock, flags);
}
static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
dma_addr_t dst,
dma_addr_t src,
size_t size,
unsigned long dma_flags)
{
struct scatterlist dst_sg;
struct scatterlist src_sg;
sg_init_table(&dst_sg, 1);
sg_init_table(&src_sg, 1);
sg_dma_address(&dst_sg) = dst;
sg_dma_address(&src_sg) = src;
sg_dma_len(&dst_sg) = size;
sg_dma_len(&src_sg) = size;
return d40_prep_sg(chan, &src_sg, &dst_sg, 1, DMA_NONE, dma_flags);
}
static struct dma_async_tx_descriptor *
d40_prep_memcpy_sg(struct dma_chan *chan,
struct scatterlist *dst_sg, unsigned int dst_nents,
struct scatterlist *src_sg, unsigned int src_nents,
unsigned long dma_flags)
{
if (dst_nents != src_nents)
return NULL;
return d40_prep_sg(chan, src_sg, dst_sg, src_nents, DMA_NONE, dma_flags);
}
static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long dma_flags,
void *context)
{
if (direction != DMA_DEV_TO_MEM && direction != DMA_MEM_TO_DEV)
return NULL;
return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags);
}
static struct dma_async_tx_descriptor *
dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
unsigned int periods = buf_len / period_len;
struct dma_async_tx_descriptor *txd;
struct scatterlist *sg;
int i;
sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
for (i = 0; i < periods; i++) {
sg_dma_address(&sg[i]) = dma_addr;
sg_dma_len(&sg[i]) = period_len;
dma_addr += period_len;
}
sg[periods].offset = 0;
sg_dma_len(&sg[periods]) = 0;
sg[periods].page_link =
((unsigned long)sg | 0x01) & ~0x02;
txd = d40_prep_sg(chan, sg, sg, periods, direction,
DMA_PREP_INTERRUPT);
kfree(sg);
return txd;
}
static enum dma_status d40_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
enum dma_status ret;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Cannot read status of unallocated channel\n");
return -EINVAL;
}
ret = dma_cookie_status(chan, cookie, txstate);
if (ret != DMA_SUCCESS)
dma_set_residue(txstate, stedma40_residue(chan));
if (d40_is_paused(d40c))
ret = DMA_PAUSED;
return ret;
}
static void d40_issue_pending(struct dma_chan *chan)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return;
}
spin_lock_irqsave(&d40c->lock, flags);
list_splice_tail_init(&d40c->pending_queue, &d40c->queue);
/* Busy means that queued jobs are already being processed */
if (!d40c->busy)
(void) d40_queue_start(d40c);
spin_unlock_irqrestore(&d40c->lock, flags);
}
static void d40_terminate_all(struct dma_chan *chan)
{
unsigned long flags;
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
int ret;
spin_lock_irqsave(&d40c->lock, flags);
pm_runtime_get_sync(d40c->base->dev);
ret = d40_channel_execute_command(d40c, D40_DMA_STOP);
if (ret)
chan_err(d40c, "Failed to stop channel\n");
d40_term_all(d40c);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
if (d40c->busy) {
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40c->busy = false;
spin_unlock_irqrestore(&d40c->lock, flags);
}
static int
dma40_config_to_halfchannel(struct d40_chan *d40c,
struct stedma40_half_channel_info *info,
enum dma_slave_buswidth width,
u32 maxburst)
{
enum stedma40_periph_data_width addr_width;
int psize;
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
addr_width = STEDMA40_BYTE_WIDTH;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
addr_width = STEDMA40_HALFWORD_WIDTH;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
addr_width = STEDMA40_WORD_WIDTH;
break;
case DMA_SLAVE_BUSWIDTH_8_BYTES:
addr_width = STEDMA40_DOUBLEWORD_WIDTH;
break;
default:
dev_err(d40c->base->dev,
"illegal peripheral address width "
"requested (%d)\n",
width);
return -EINVAL;
}
if (chan_is_logical(d40c)) {
if (maxburst >= 16)
psize = STEDMA40_PSIZE_LOG_16;
else if (maxburst >= 8)
psize = STEDMA40_PSIZE_LOG_8;
else if (maxburst >= 4)
psize = STEDMA40_PSIZE_LOG_4;
else
psize = STEDMA40_PSIZE_LOG_1;
} else {
if (maxburst >= 16)
psize = STEDMA40_PSIZE_PHY_16;
else if (maxburst >= 8)
psize = STEDMA40_PSIZE_PHY_8;
else if (maxburst >= 4)
psize = STEDMA40_PSIZE_PHY_4;
else
psize = STEDMA40_PSIZE_PHY_1;
}
info->data_width = addr_width;
info->psize = psize;
info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
return 0;
}
/* Runtime reconfiguration extension */
static int d40_set_runtime_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
enum dma_slave_buswidth src_addr_width, dst_addr_width;
dma_addr_t config_addr;
u32 src_maxburst, dst_maxburst;
int ret;
src_addr_width = config->src_addr_width;
src_maxburst = config->src_maxburst;
dst_addr_width = config->dst_addr_width;
dst_maxburst = config->dst_maxburst;
if (config->direction == DMA_DEV_TO_MEM) {
dma_addr_t dev_addr_rx =
d40c->base->plat_data->dev_rx[cfg->src_dev_type];
config_addr = config->src_addr;
if (dev_addr_rx)
dev_dbg(d40c->base->dev,
"channel has a pre-wired RX address %08x "
"overriding with %08x\n",
dev_addr_rx, config_addr);
if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
dev_dbg(d40c->base->dev,
"channel was not configured for peripheral "
"to memory transfer (%d) overriding\n",
cfg->dir);
cfg->dir = STEDMA40_PERIPH_TO_MEM;
/* Configure the memory side */
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
dst_addr_width = src_addr_width;
if (dst_maxburst == 0)
dst_maxburst = src_maxburst;
} else if (config->direction == DMA_MEM_TO_DEV) {
dma_addr_t dev_addr_tx =
d40c->base->plat_data->dev_tx[cfg->dst_dev_type];
config_addr = config->dst_addr;
if (dev_addr_tx)
dev_dbg(d40c->base->dev,
"channel has a pre-wired TX address %08x "
"overriding with %08x\n",
dev_addr_tx, config_addr);
if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
dev_dbg(d40c->base->dev,
"channel was not configured for memory "
"to peripheral transfer (%d) overriding\n",
cfg->dir);
cfg->dir = STEDMA40_MEM_TO_PERIPH;
/* Configure the memory side */
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
src_addr_width = dst_addr_width;
if (src_maxburst == 0)
src_maxburst = dst_maxburst;
} else {
dev_err(d40c->base->dev,
"unrecognized channel direction %d\n",
config->direction);
return -EINVAL;
}
if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
dev_err(d40c->base->dev,
"src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
src_maxburst,
src_addr_width,
dst_maxburst,
dst_addr_width);
return -EINVAL;
}
ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
src_addr_width,
src_maxburst);
if (ret)
return ret;
ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
dst_addr_width,
dst_maxburst);
if (ret)
return ret;
/* Fill in register values */
if (chan_is_logical(d40c))
d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
else
d40_phy_cfg(cfg, &d40c->src_def_cfg,
&d40c->dst_def_cfg, false);
/* These settings will take precedence later */
d40c->runtime_addr = config_addr;
d40c->runtime_direction = config->direction;
dev_dbg(d40c->base->dev,
"configured channel %s for %s, data width %d/%d, "
"maxburst %d/%d elements, LE, no flow control\n",
dma_chan_name(chan),
(config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
src_addr_width, dst_addr_width,
src_maxburst, dst_maxburst);
return 0;
}
static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return -EINVAL;
}
switch (cmd) {
case DMA_TERMINATE_ALL:
d40_terminate_all(chan);
return 0;
case DMA_PAUSE:
return d40_pause(d40c);
case DMA_RESUME:
return d40_resume(d40c);
case DMA_SLAVE_CONFIG:
return d40_set_runtime_config(chan,
(struct dma_slave_config *) arg);
default:
break;
}
/* Other commands are unimplemented */
return -ENXIO;
}
/* Initialization functions */
static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
struct d40_chan *chans, int offset,
int num_chans)
{
int i = 0;
struct d40_chan *d40c;
INIT_LIST_HEAD(&dma->channels);
for (i = offset; i < offset + num_chans; i++) {
d40c = &chans[i];
d40c->base = base;
d40c->chan.device = dma;
spin_lock_init(&d40c->lock);
d40c->log_num = D40_PHY_CHAN;
INIT_LIST_HEAD(&d40c->active);
INIT_LIST_HEAD(&d40c->queue);
INIT_LIST_HEAD(&d40c->pending_queue);
INIT_LIST_HEAD(&d40c->client);
INIT_LIST_HEAD(&d40c->prepare_queue);
tasklet_init(&d40c->tasklet, dma_tasklet,
(unsigned long) d40c);
list_add_tail(&d40c->chan.device_node,
&dma->channels);
}
}
static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
{
if (dma_has_cap(DMA_SLAVE, dev->cap_mask))
dev->device_prep_slave_sg = d40_prep_slave_sg;
if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) {
dev->device_prep_dma_memcpy = d40_prep_memcpy;
/*
* This controller can only access address at even
* 32bit boundaries, i.e. 2^2
*/
dev->copy_align = 2;
}
if (dma_has_cap(DMA_SG, dev->cap_mask))
dev->device_prep_dma_sg = d40_prep_memcpy_sg;
if (dma_has_cap(DMA_CYCLIC, dev->cap_mask))
dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic;
dev->device_alloc_chan_resources = d40_alloc_chan_resources;
dev->device_free_chan_resources = d40_free_chan_resources;
dev->device_issue_pending = d40_issue_pending;
dev->device_tx_status = d40_tx_status;
dev->device_control = d40_control;
dev->dev = base->dev;
}
static int __init d40_dmaengine_init(struct d40_base *base,
int num_reserved_chans)
{
int err ;
d40_chan_init(base, &base->dma_slave, base->log_chans,
0, base->num_log_chans);
dma_cap_zero(base->dma_slave.cap_mask);
dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
d40_ops_init(base, &base->dma_slave);
err = dma_async_device_register(&base->dma_slave);
if (err) {
d40_err(base->dev, "Failed to register slave channels\n");
goto failure1;
}
d40_chan_init(base, &base->dma_memcpy, base->log_chans,
base->num_log_chans, base->plat_data->memcpy_len);
dma_cap_zero(base->dma_memcpy.cap_mask);
dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
dma_cap_set(DMA_SG, base->dma_memcpy.cap_mask);
d40_ops_init(base, &base->dma_memcpy);
err = dma_async_device_register(&base->dma_memcpy);
if (err) {
d40_err(base->dev,
"Failed to regsiter memcpy only channels\n");
goto failure2;
}
d40_chan_init(base, &base->dma_both, base->phy_chans,
0, num_reserved_chans);
dma_cap_zero(base->dma_both.cap_mask);
dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
dma_cap_set(DMA_SG, base->dma_both.cap_mask);
dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
d40_ops_init(base, &base->dma_both);
err = dma_async_device_register(&base->dma_both);
if (err) {
d40_err(base->dev,
"Failed to register logical and physical capable channels\n");
goto failure3;
}
return 0;
failure3:
dma_async_device_unregister(&base->dma_memcpy);
failure2:
dma_async_device_unregister(&base->dma_slave);
failure1:
return err;
}
/* Suspend resume functionality */
#ifdef CONFIG_PM
static int dma40_pm_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct d40_base *base = platform_get_drvdata(pdev);
int ret = 0;
if (!pm_runtime_suspended(dev))
return -EBUSY;
if (base->lcpa_regulator)
ret = regulator_disable(base->lcpa_regulator);
return ret;
}
static int dma40_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct d40_base *base = platform_get_drvdata(pdev);
d40_save_restore_registers(base, true);
/* Don't disable/enable clocks for v1 due to HW bugs */
if (base->rev != 1)
writel_relaxed(base->gcc_pwr_off_mask,
base->virtbase + D40_DREG_GCC);
return 0;
}
static int dma40_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct d40_base *base = platform_get_drvdata(pdev);
if (base->initialized)
d40_save_restore_registers(base, false);
writel_relaxed(D40_DREG_GCC_ENABLE_ALL,
base->virtbase + D40_DREG_GCC);
return 0;
}