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ste_dma40.c
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ste_dma40.c
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/*
* Copyright (C) Ericsson AB 2007-2008
* Copyright (C) ST-Ericsson SA 2008-2010
* Author: Per Forlin <[email protected]> for ST-Ericsson
* Author: Jonas Aaberg <[email protected]> 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/log2.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_dma.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
/* Max number of logical channels per physical channel */
#define D40_MAX_LOG_CHAN_PER_PHY 32
/* 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 BIT(31)
#define D40_ALLOC_PHY BIT(30)
#define D40_ALLOC_LOG_FREE 0
#define D40_MEMCPY_MAX_CHANS 8
/* Reserved event lines for memcpy only. */
#define DB8500_DMA_MEMCPY_EV_0 51
#define DB8500_DMA_MEMCPY_EV_1 56
#define DB8500_DMA_MEMCPY_EV_2 57
#define DB8500_DMA_MEMCPY_EV_3 58
#define DB8500_DMA_MEMCPY_EV_4 59
#define DB8500_DMA_MEMCPY_EV_5 60
static int dma40_memcpy_channels[] = {
DB8500_DMA_MEMCPY_EV_0,
DB8500_DMA_MEMCPY_EV_1,
DB8500_DMA_MEMCPY_EV_2,
DB8500_DMA_MEMCPY_EV_3,
DB8500_DMA_MEMCPY_EV_4,
DB8500_DMA_MEMCPY_EV_5,
};
/* Default configuration for physcial memcpy */
static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
.mode = STEDMA40_MODE_PHYSICAL,
.dir = DMA_MEM_TO_MEM,
.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.src_info.psize = STEDMA40_PSIZE_PHY_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.dst_info.psize = STEDMA40_PSIZE_PHY_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/* Default configuration for logical memcpy */
static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
.mode = STEDMA40_MODE_LOGICAL,
.dir = DMA_MEM_TO_MEM,
.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.src_info.psize = STEDMA40_PSIZE_LOG_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.dst_info.psize = STEDMA40_PSIZE_LOG_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/**
* 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)
/*
* since 9540 and 8540 has the same HW revision
* use v4a for 9540 or ealier
* use v4b for 8540 or later
* HW revision:
* DB8500ed has revision 0
* DB8500v1 has revision 2
* DB8500v2 has revision 3
* AP9540v1 has revision 4
* DB8540v1 has revision 4
* TODO: Check if all these registers have to be saved/restored on dma40 v4a
*/
static u32 d40_backup_regs_v4a[] = {
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_V4A ARRAY_SIZE(d40_backup_regs_v4a)
static u32 d40_backup_regs_v4b[] = {
D40_DREG_CPSEG1,
D40_DREG_CPSEG2,
D40_DREG_CPSEG3,
D40_DREG_CPSEG4,
D40_DREG_CPSEG5,
D40_DREG_CPCEG1,
D40_DREG_CPCEG2,
D40_DREG_CPCEG3,
D40_DREG_CPCEG4,
D40_DREG_CPCEG5,
D40_DREG_CRSEG1,
D40_DREG_CRSEG2,
D40_DREG_CRSEG3,
D40_DREG_CRSEG4,
D40_DREG_CRSEG5,
D40_DREG_CRCEG1,
D40_DREG_CRCEG2,
D40_DREG_CRCEG3,
D40_DREG_CRCEG4,
D40_DREG_CRCEG5,
};
#define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b)
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,
};
#define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
/**
* 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;
};
static struct d40_interrupt_lookup il_v4a[] = {
{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},
};
static struct d40_interrupt_lookup il_v4b[] = {
{D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false, 0},
{D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32},
{D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64},
{D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96},
{D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128},
{D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true, 0},
{D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true, 32},
{D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true, 64},
{D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true, 96},
{D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true, 128},
{D40_DREG_CPCTIS, D40_DREG_CPCICR, false, D40_PHY_CHAN},
{D40_DREG_CPCEIS, D40_DREG_CPCICR, true, D40_PHY_CHAN},
};
/**
* 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 __initdata struct d40_reg_val dma_init_reg_v4a[] = {
/* Clock every part of the DMA block from start */
{ .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
/* Interrupts on all logical channels */
{ .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
};
static __initdata struct d40_reg_val dma_init_reg_v4b[] = {
/* Clock every part of the DMA block from start */
{ .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
/* Interrupts on all logical channels */
{ .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF}
};
/**
* 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.
* @use_soft_lli: To mark if the linked lists of channel are managed by SW.
*/
struct d40_phy_res {
spinlock_t lock;
bool reserved;
int num;
u32 allocated_src;
u32 allocated_dst;
bool use_soft_lli;
};
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.
* @done: Completed jobs
* @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 done;
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_gen_dmac - generic values to represent u8500/u8540 DMA
* controller
*
* @backup: the pointer to the registers address array for backup
* @backup_size: the size of the registers address array for backup
* @realtime_en: the realtime enable register
* @realtime_clear: the realtime clear register
* @high_prio_en: the high priority enable register
* @high_prio_clear: the high priority clear register
* @interrupt_en: the interrupt enable register
* @interrupt_clear: the interrupt clear register
* @il: the pointer to struct d40_interrupt_lookup
* @il_size: the size of d40_interrupt_lookup array
* @init_reg: the pointer to the struct d40_reg_val
* @init_reg_size: the size of d40_reg_val array
*/
struct d40_gen_dmac {
u32 *backup;
u32 backup_size;
u32 realtime_en;
u32 realtime_clear;
u32 high_prio_en;
u32 high_prio_clear;
u32 interrupt_en;
u32 interrupt_clear;
struct d40_interrupt_lookup *il;
u32 il_size;
struct d40_reg_val *init_reg;
u32 init_reg_size;
};
/**
* 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_memcpy_chans: The number of channels used for memcpy (mem-to-mem
* transfers).
* @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_v4: 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.
* @gen_dmac: the struct for generic registers values to represent u8500/8540
* DMA controller
*/
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_memcpy_chans;
int num_phy_chans;
int num_log_chans;
struct device_dma_parameters dma_parms;
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_v4[BACKUP_REGS_SZ_MAX];
u32 *reg_val_backup_chan;
u16 gcc_pwr_off_mask;
struct d40_gen_dmac gen_dmac;
};
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;
spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
/*
* 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++) {
int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
if (!d40c->base->lcla_pool.alloc_map[idx]) {
d40c->base->lcla_pool.alloc_map[idx] = 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++) {
int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
if (d40c->base->lcla_pool.alloc_map[idx] == d40d) {
d40c->base->lcla_pool.alloc_map[idx] = 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_desc_done(struct d40_chan *d40c, struct d40_desc *desc)
{
list_add_tail(&desc->node, &d40c->done);
}
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)) {
/*
* If the channel is expected to use only soft_lli don't
* allocate a lcla. This is to avoid a HW issue that exists
* in some controller during a peripheral to memory transfer
* that uses linked lists.
*/
if (!(chan->phy_chan->use_soft_lli &&
chan->dma_cfg.dir == DMA_DEV_TO_MEM))
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 set_current;
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;
}
}
set_current:
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)
{
return list_first_entry_or_null(&d40c->active, struct d40_desc, node);
}
/* 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)
{
return list_first_entry_or_null(&d40c->pending_queue, struct d40_desc,
node);
}
static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->queue, struct d40_desc, node);
}
static struct d40_desc *d40_first_done(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->done, struct d40_desc, node);
}
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, where data_width is stored in Bytes.
*
* 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, max_w);
if (seg_max > STEDMA40_MAX_SEG_SIZE)
seg_max -= max_w;
if (!IS_ALIGNED(size, max_w))
return -EINVAL;