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linux/drivers/dma/pl330.c
Sachin Kamat 61c6e7531d DMA: PL330: Check the pointer returned by kzalloc 
kzalloc could return NULL. Hence add a check to avoid
NULL pointer dereference.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2012-09-18 09:04:52 +05:30

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/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Copyright (C) 2010 Samsung Electronics Co. Ltd.
* Jaswinder Singh <jassi.brar@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/amba/bus.h>
#include <linux/amba/pl330.h>
#include <linux/pm_runtime.h>
#include <linux/scatterlist.h>
#include <linux/of.h>
#include "dmaengine.h"
#define PL330_MAX_CHAN 8
#define PL330_MAX_IRQS 32
#define PL330_MAX_PERI 32
enum pl330_srccachectrl {
SCCTRL0, /* Noncacheable and nonbufferable */
SCCTRL1, /* Bufferable only */
SCCTRL2, /* Cacheable, but do not allocate */
SCCTRL3, /* Cacheable and bufferable, but do not allocate */
SINVALID1,
SINVALID2,
SCCTRL6, /* Cacheable write-through, allocate on reads only */
SCCTRL7, /* Cacheable write-back, allocate on reads only */
};
enum pl330_dstcachectrl {
DCCTRL0, /* Noncacheable and nonbufferable */
DCCTRL1, /* Bufferable only */
DCCTRL2, /* Cacheable, but do not allocate */
DCCTRL3, /* Cacheable and bufferable, but do not allocate */
DINVALID1, /* AWCACHE = 0x1000 */
DINVALID2,
DCCTRL6, /* Cacheable write-through, allocate on writes only */
DCCTRL7, /* Cacheable write-back, allocate on writes only */
};
enum pl330_byteswap {
SWAP_NO,
SWAP_2,
SWAP_4,
SWAP_8,
SWAP_16,
};
enum pl330_reqtype {
MEMTOMEM,
MEMTODEV,
DEVTOMEM,
DEVTODEV,
};
/* Register and Bit field Definitions */
#define DS 0x0
#define DS_ST_STOP 0x0
#define DS_ST_EXEC 0x1
#define DS_ST_CMISS 0x2
#define DS_ST_UPDTPC 0x3
#define DS_ST_WFE 0x4
#define DS_ST_ATBRR 0x5
#define DS_ST_QBUSY 0x6
#define DS_ST_WFP 0x7
#define DS_ST_KILL 0x8
#define DS_ST_CMPLT 0x9
#define DS_ST_FLTCMP 0xe
#define DS_ST_FAULT 0xf
#define DPC 0x4
#define INTEN 0x20
#define ES 0x24
#define INTSTATUS 0x28
#define INTCLR 0x2c
#define FSM 0x30
#define FSC 0x34
#define FTM 0x38
#define _FTC 0x40
#define FTC(n) (_FTC + (n)*0x4)
#define _CS 0x100
#define CS(n) (_CS + (n)*0x8)
#define CS_CNS (1 << 21)
#define _CPC 0x104
#define CPC(n) (_CPC + (n)*0x8)
#define _SA 0x400
#define SA(n) (_SA + (n)*0x20)
#define _DA 0x404
#define DA(n) (_DA + (n)*0x20)
#define _CC 0x408
#define CC(n) (_CC + (n)*0x20)
#define CC_SRCINC (1 << 0)
#define CC_DSTINC (1 << 14)
#define CC_SRCPRI (1 << 8)
#define CC_DSTPRI (1 << 22)
#define CC_SRCNS (1 << 9)
#define CC_DSTNS (1 << 23)
#define CC_SRCIA (1 << 10)
#define CC_DSTIA (1 << 24)
#define CC_SRCBRSTLEN_SHFT 4
#define CC_DSTBRSTLEN_SHFT 18
#define CC_SRCBRSTSIZE_SHFT 1
#define CC_DSTBRSTSIZE_SHFT 15
#define CC_SRCCCTRL_SHFT 11
#define CC_SRCCCTRL_MASK 0x7
#define CC_DSTCCTRL_SHFT 25
#define CC_DRCCCTRL_MASK 0x7
#define CC_SWAP_SHFT 28
#define _LC0 0x40c
#define LC0(n) (_LC0 + (n)*0x20)
#define _LC1 0x410
#define LC1(n) (_LC1 + (n)*0x20)
#define DBGSTATUS 0xd00
#define DBG_BUSY (1 << 0)
#define DBGCMD 0xd04
#define DBGINST0 0xd08
#define DBGINST1 0xd0c
#define CR0 0xe00
#define CR1 0xe04
#define CR2 0xe08
#define CR3 0xe0c
#define CR4 0xe10
#define CRD 0xe14
#define PERIPH_ID 0xfe0
#define PERIPH_REV_SHIFT 20
#define PERIPH_REV_MASK 0xf
#define PERIPH_REV_R0P0 0
#define PERIPH_REV_R1P0 1
#define PERIPH_REV_R1P1 2
#define PCELL_ID 0xff0
#define CR0_PERIPH_REQ_SET (1 << 0)
#define CR0_BOOT_EN_SET (1 << 1)
#define CR0_BOOT_MAN_NS (1 << 2)
#define CR0_NUM_CHANS_SHIFT 4
#define CR0_NUM_CHANS_MASK 0x7
#define CR0_NUM_PERIPH_SHIFT 12
#define CR0_NUM_PERIPH_MASK 0x1f
#define CR0_NUM_EVENTS_SHIFT 17
#define CR0_NUM_EVENTS_MASK 0x1f
#define CR1_ICACHE_LEN_SHIFT 0
#define CR1_ICACHE_LEN_MASK 0x7
#define CR1_NUM_ICACHELINES_SHIFT 4
#define CR1_NUM_ICACHELINES_MASK 0xf
#define CRD_DATA_WIDTH_SHIFT 0
#define CRD_DATA_WIDTH_MASK 0x7
#define CRD_WR_CAP_SHIFT 4
#define CRD_WR_CAP_MASK 0x7
#define CRD_WR_Q_DEP_SHIFT 8
#define CRD_WR_Q_DEP_MASK 0xf
#define CRD_RD_CAP_SHIFT 12
#define CRD_RD_CAP_MASK 0x7
#define CRD_RD_Q_DEP_SHIFT 16
#define CRD_RD_Q_DEP_MASK 0xf
#define CRD_DATA_BUFF_SHIFT 20
#define CRD_DATA_BUFF_MASK 0x3ff
#define PART 0x330
#define DESIGNER 0x41
#define REVISION 0x0
#define INTEG_CFG 0x0
#define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12))
#define PCELL_ID_VAL 0xb105f00d
#define PL330_STATE_STOPPED (1 << 0)
#define PL330_STATE_EXECUTING (1 << 1)
#define PL330_STATE_WFE (1 << 2)
#define PL330_STATE_FAULTING (1 << 3)
#define PL330_STATE_COMPLETING (1 << 4)
#define PL330_STATE_WFP (1 << 5)
#define PL330_STATE_KILLING (1 << 6)
#define PL330_STATE_FAULT_COMPLETING (1 << 7)
#define PL330_STATE_CACHEMISS (1 << 8)
#define PL330_STATE_UPDTPC (1 << 9)
#define PL330_STATE_ATBARRIER (1 << 10)
#define PL330_STATE_QUEUEBUSY (1 << 11)
#define PL330_STATE_INVALID (1 << 15)
#define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
| PL330_STATE_WFE | PL330_STATE_FAULTING)
#define CMD_DMAADDH 0x54
#define CMD_DMAEND 0x00
#define CMD_DMAFLUSHP 0x35
#define CMD_DMAGO 0xa0
#define CMD_DMALD 0x04
#define CMD_DMALDP 0x25
#define CMD_DMALP 0x20
#define CMD_DMALPEND 0x28
#define CMD_DMAKILL 0x01
#define CMD_DMAMOV 0xbc
#define CMD_DMANOP 0x18
#define CMD_DMARMB 0x12
#define CMD_DMASEV 0x34
#define CMD_DMAST 0x08
#define CMD_DMASTP 0x29
#define CMD_DMASTZ 0x0c
#define CMD_DMAWFE 0x36
#define CMD_DMAWFP 0x30
#define CMD_DMAWMB 0x13
#define SZ_DMAADDH 3
#define SZ_DMAEND 1
#define SZ_DMAFLUSHP 2
#define SZ_DMALD 1
#define SZ_DMALDP 2
#define SZ_DMALP 2
#define SZ_DMALPEND 2
#define SZ_DMAKILL 1
#define SZ_DMAMOV 6
#define SZ_DMANOP 1
#define SZ_DMARMB 1
#define SZ_DMASEV 2
#define SZ_DMAST 1
#define SZ_DMASTP 2
#define SZ_DMASTZ 1
#define SZ_DMAWFE 2
#define SZ_DMAWFP 2
#define SZ_DMAWMB 1
#define SZ_DMAGO 6
#define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
#define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
#define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
#define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
/*
* With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
* at 1byte/burst for P<->M and M<->M respectively.
* For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
* should be enough for P<->M and M<->M respectively.
*/
#define MCODE_BUFF_PER_REQ 256
/* If the _pl330_req is available to the client */
#define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND)
/* Use this _only_ to wait on transient states */
#define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
#ifdef PL330_DEBUG_MCGEN
static unsigned cmd_line;
#define PL330_DBGCMD_DUMP(off, x...) do { \
printk("%x:", cmd_line); \
printk(x); \
cmd_line += off; \
} while (0)
#define PL330_DBGMC_START(addr) (cmd_line = addr)
#else
#define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
#define PL330_DBGMC_START(addr) do {} while (0)
#endif
/* The number of default descriptors */
#define NR_DEFAULT_DESC 16
/* Populated by the PL330 core driver for DMA API driver's info */
struct pl330_config {
u32 periph_id;
u32 pcell_id;
#define DMAC_MODE_NS (1 << 0)
unsigned int mode;
unsigned int data_bus_width:10; /* In number of bits */
unsigned int data_buf_dep:10;
unsigned int num_chan:4;
unsigned int num_peri:6;
u32 peri_ns;
unsigned int num_events:6;
u32 irq_ns;
};
/* Handle to the DMAC provided to the PL330 core */
struct pl330_info {
/* Owning device */
struct device *dev;
/* Size of MicroCode buffers for each channel. */
unsigned mcbufsz;
/* ioremap'ed address of PL330 registers. */
void __iomem *base;
/* Client can freely use it. */
void *client_data;
/* PL330 core data, Client must not touch it. */
void *pl330_data;
/* Populated by the PL330 core driver during pl330_add */
struct pl330_config pcfg;
/*
* If the DMAC has some reset mechanism, then the
* client may want to provide pointer to the method.
*/
void (*dmac_reset)(struct pl330_info *pi);
};
/**
* Request Configuration.
* The PL330 core does not modify this and uses the last
* working configuration if the request doesn't provide any.
*
* The Client may want to provide this info only for the
* first request and a request with new settings.
*/
struct pl330_reqcfg {
/* Address Incrementing */
unsigned dst_inc:1;
unsigned src_inc:1;
/*
* For now, the SRC & DST protection levels
* and burst size/length are assumed same.
*/
bool nonsecure;
bool privileged;
bool insnaccess;
unsigned brst_len:5;
unsigned brst_size:3; /* in power of 2 */
enum pl330_dstcachectrl dcctl;
enum pl330_srccachectrl scctl;
enum pl330_byteswap swap;
struct pl330_config *pcfg;
};
/*
* One cycle of DMAC operation.
* There may be more than one xfer in a request.
*/
struct pl330_xfer {
u32 src_addr;
u32 dst_addr;
/* Size to xfer */
u32 bytes;
/*
* Pointer to next xfer in the list.
* The last xfer in the req must point to NULL.
*/
struct pl330_xfer *next;
};
/* The xfer callbacks are made with one of these arguments. */
enum pl330_op_err {
/* The all xfers in the request were success. */
PL330_ERR_NONE,
/* If req aborted due to global error. */
PL330_ERR_ABORT,
/* If req failed due to problem with Channel. */
PL330_ERR_FAIL,
};
/* A request defining Scatter-Gather List ending with NULL xfer. */
struct pl330_req {
enum pl330_reqtype rqtype;
/* Index of peripheral for the xfer. */
unsigned peri:5;
/* Unique token for this xfer, set by the client. */
void *token;
/* Callback to be called after xfer. */
void (*xfer_cb)(void *token, enum pl330_op_err err);
/* If NULL, req will be done at last set parameters. */
struct pl330_reqcfg *cfg;
/* Pointer to first xfer in the request. */
struct pl330_xfer *x;
/* Hook to attach to DMAC's list of reqs with due callback */
struct list_head rqd;
};
/*
* To know the status of the channel and DMAC, the client
* provides a pointer to this structure. The PL330 core
* fills it with current information.
*/
struct pl330_chanstatus {
/*
* If the DMAC engine halted due to some error,
* the client should remove-add DMAC.
*/
bool dmac_halted;
/*
* If channel is halted due to some error,
* the client should ABORT/FLUSH and START the channel.
*/
bool faulting;
/* Location of last load */
u32 src_addr;
/* Location of last store */
u32 dst_addr;
/*
* Pointer to the currently active req, NULL if channel is
* inactive, even though the requests may be present.
*/
struct pl330_req *top_req;
/* Pointer to req waiting second in the queue if any. */
struct pl330_req *wait_req;
};
enum pl330_chan_op {
/* Start the channel */
PL330_OP_START,
/* Abort the active xfer */
PL330_OP_ABORT,
/* Stop xfer and flush queue */
PL330_OP_FLUSH,
};
struct _xfer_spec {
u32 ccr;
struct pl330_req *r;
struct pl330_xfer *x;
};
enum dmamov_dst {
SAR = 0,
CCR,
DAR,
};
enum pl330_dst {
SRC = 0,
DST,
};
enum pl330_cond {
SINGLE,
BURST,
ALWAYS,
};
struct _pl330_req {
u32 mc_bus;
void *mc_cpu;
/* Number of bytes taken to setup MC for the req */
u32 mc_len;
struct pl330_req *r;
};
/* ToBeDone for tasklet */
struct _pl330_tbd {
bool reset_dmac;
bool reset_mngr;
u8 reset_chan;
};
/* A DMAC Thread */
struct pl330_thread {
u8 id;
int ev;
/* If the channel is not yet acquired by any client */
bool free;
/* Parent DMAC */
struct pl330_dmac *dmac;
/* Only two at a time */
struct _pl330_req req[2];
/* Index of the last enqueued request */
unsigned lstenq;
/* Index of the last submitted request or -1 if the DMA is stopped */
int req_running;
};
enum pl330_dmac_state {
UNINIT,
INIT,
DYING,
};
/* A DMAC */
struct pl330_dmac {
spinlock_t lock;
/* Holds list of reqs with due callbacks */
struct list_head req_done;
/* Pointer to platform specific stuff */
struct pl330_info *pinfo;
/* Maximum possible events/irqs */
int events[32];
/* BUS address of MicroCode buffer */
u32 mcode_bus;
/* CPU address of MicroCode buffer */
void *mcode_cpu;
/* List of all Channel threads */
struct pl330_thread *channels;
/* Pointer to the MANAGER thread */
struct pl330_thread *manager;
/* To handle bad news in interrupt */
struct tasklet_struct tasks;
struct _pl330_tbd dmac_tbd;
/* State of DMAC operation */
enum pl330_dmac_state state;
};
enum desc_status {
/* In the DMAC pool */
FREE,
/*
* Allocted to some channel during prep_xxx
* Also may be sitting on the work_list.
*/
PREP,
/*
* Sitting on the work_list and already submitted
* to the PL330 core. Not more than two descriptors
* of a channel can be BUSY at any time.
*/
BUSY,
/*
* Sitting on the channel work_list but xfer done
* by PL330 core
*/
DONE,
};
struct dma_pl330_chan {
/* Schedule desc completion */
struct tasklet_struct task;
/* DMA-Engine Channel */
struct dma_chan chan;
/* List of to be xfered descriptors */
struct list_head work_list;
/* Pointer to the DMAC that manages this channel,
* NULL if the channel is available to be acquired.
* As the parent, this DMAC also provides descriptors
* to the channel.
*/
struct dma_pl330_dmac *dmac;
/* To protect channel manipulation */
spinlock_t lock;
/* Token of a hardware channel thread of PL330 DMAC
* NULL if the channel is available to be acquired.
*/
void *pl330_chid;
/* For D-to-M and M-to-D channels */
int burst_sz; /* the peripheral fifo width */
int burst_len; /* the number of burst */
dma_addr_t fifo_addr;
/* for cyclic capability */
bool cyclic;
};
struct dma_pl330_dmac {
struct pl330_info pif;
/* DMA-Engine Device */
struct dma_device ddma;
/* Pool of descriptors available for the DMAC's channels */
struct list_head desc_pool;
/* To protect desc_pool manipulation */
spinlock_t pool_lock;
/* Peripheral channels connected to this DMAC */
struct dma_pl330_chan *peripherals; /* keep at end */
struct clk *clk;
};
struct dma_pl330_desc {
/* To attach to a queue as child */
struct list_head node;
/* Descriptor for the DMA Engine API */
struct dma_async_tx_descriptor txd;
/* Xfer for PL330 core */
struct pl330_xfer px;
struct pl330_reqcfg rqcfg;
struct pl330_req req;
enum desc_status status;
/* The channel which currently holds this desc */
struct dma_pl330_chan *pchan;
};
static inline void _callback(struct pl330_req *r, enum pl330_op_err err)
{
if (r && r->xfer_cb)
r->xfer_cb(r->token, err);
}
static inline bool _queue_empty(struct pl330_thread *thrd)
{
return (IS_FREE(&thrd->req[0]) && IS_FREE(&thrd->req[1]))
? true : false;
}
static inline bool _queue_full(struct pl330_thread *thrd)
{
return (IS_FREE(&thrd->req[0]) || IS_FREE(&thrd->req[1]))
? false : true;
}
static inline bool is_manager(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
/* MANAGER is indexed at the end */
if (thrd->id == pl330->pinfo->pcfg.num_chan)
return true;
else
return false;
}
/* If manager of the thread is in Non-Secure mode */
static inline bool _manager_ns(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false;
}
static inline u32 get_id(struct pl330_info *pi, u32 off)
{
void __iomem *regs = pi->base;
u32 id = 0;
id |= (readb(regs + off + 0x0) << 0);
id |= (readb(regs + off + 0x4) << 8);
id |= (readb(regs + off + 0x8) << 16);
id |= (readb(regs + off + 0xc) << 24);
return id;
}
static inline u32 get_revision(u32 periph_id)
{
return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK;
}
static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[],
enum pl330_dst da, u16 val)
{
if (dry_run)
return SZ_DMAADDH;
buf[0] = CMD_DMAADDH;
buf[0] |= (da << 1);
*((u16 *)&buf[1]) = val;
PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n",
da == 1 ? "DA" : "SA", val);
return SZ_DMAADDH;
}
static inline u32 _emit_END(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAEND;
buf[0] = CMD_DMAEND;
PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
return SZ_DMAEND;
}
static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
{
if (dry_run)
return SZ_DMAFLUSHP;
buf[0] = CMD_DMAFLUSHP;
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3);
return SZ_DMAFLUSHP;
}
static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond)
{
if (dry_run)
return SZ_DMALD;
buf[0] = CMD_DMALD;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
return SZ_DMALD;
}
static inline u32 _emit_LDP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMALDP;
buf[0] = CMD_DMALDP;
if (cond == BURST)
buf[0] |= (1 << 1);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n",
cond == SINGLE ? 'S' : 'B', peri >> 3);
return SZ_DMALDP;
}
static inline u32 _emit_LP(unsigned dry_run, u8 buf[],
unsigned loop, u8 cnt)
{
if (dry_run)
return SZ_DMALP;
buf[0] = CMD_DMALP;
if (loop)
buf[0] |= (1 << 1);
cnt--; /* DMAC increments by 1 internally */
buf[1] = cnt;
PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt);
return SZ_DMALP;
}
struct _arg_LPEND {
enum pl330_cond cond;
bool forever;
unsigned loop;
u8 bjump;
};
static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[],
const struct _arg_LPEND *arg)
{
enum pl330_cond cond = arg->cond;
bool forever = arg->forever;
unsigned loop = arg->loop;
u8 bjump = arg->bjump;
if (dry_run)
return SZ_DMALPEND;
buf[0] = CMD_DMALPEND;
if (loop)
buf[0] |= (1 << 2);
if (!forever)
buf[0] |= (1 << 4);
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
buf[1] = bjump;
PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n",
forever ? "FE" : "END",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'),
loop ? '1' : '0',
bjump);
return SZ_DMALPEND;
}
static inline u32 _emit_KILL(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAKILL;
buf[0] = CMD_DMAKILL;
return SZ_DMAKILL;
}
static inline u32 _emit_MOV(unsigned dry_run, u8 buf[],
enum dmamov_dst dst, u32 val)
{
if (dry_run)
return SZ_DMAMOV;
buf[0] = CMD_DMAMOV;
buf[1] = dst;
*((u32 *)&buf[2]) = val;
PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n",
dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val);
return SZ_DMAMOV;
}
static inline u32 _emit_NOP(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMANOP;
buf[0] = CMD_DMANOP;
PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n");
return SZ_DMANOP;
}
static inline u32 _emit_RMB(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMARMB;
buf[0] = CMD_DMARMB;
PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n");
return SZ_DMARMB;
}
static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev)
{
if (dry_run)
return SZ_DMASEV;
buf[0] = CMD_DMASEV;
ev &= 0x1f;
ev <<= 3;
buf[1] = ev;
PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3);
return SZ_DMASEV;
}
static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond)
{
if (dry_run)
return SZ_DMAST;
buf[0] = CMD_DMAST;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
return SZ_DMAST;
}
static inline u32 _emit_STP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMASTP;
buf[0] = CMD_DMASTP;
if (cond == BURST)
buf[0] |= (1 << 1);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n",
cond == SINGLE ? 'S' : 'B', peri >> 3);
return SZ_DMASTP;
}
static inline u32 _emit_STZ(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMASTZ;
buf[0] = CMD_DMASTZ;
PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n");
return SZ_DMASTZ;
}
static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev,
unsigned invalidate)
{
if (dry_run)
return SZ_DMAWFE;
buf[0] = CMD_DMAWFE;
ev &= 0x1f;
ev <<= 3;
buf[1] = ev;
if (invalidate)
buf[1] |= (1 << 1);
PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n",
ev >> 3, invalidate ? ", I" : "");
return SZ_DMAWFE;
}
static inline u32 _emit_WFP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMAWFP;
buf[0] = CMD_DMAWFP;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (0 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (0 << 0);
else
buf[0] |= (0 << 1) | (1 << 0);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3);
return SZ_DMAWFP;
}
static inline u32 _emit_WMB(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAWMB;
buf[0] = CMD_DMAWMB;
PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n");
return SZ_DMAWMB;
}
struct _arg_GO {
u8 chan;
u32 addr;
unsigned ns;
};
static inline u32 _emit_GO(unsigned dry_run, u8 buf[],
const struct _arg_GO *arg)
{
u8 chan = arg->chan;
u32 addr = arg->addr;
unsigned ns = arg->ns;
if (dry_run)
return SZ_DMAGO;
buf[0] = CMD_DMAGO;
buf[0] |= (ns << 1);
buf[1] = chan & 0x7;
*((u32 *)&buf[2]) = addr;
return SZ_DMAGO;
}
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
/* Returns Time-Out */
static bool _until_dmac_idle(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->pinfo->base;
unsigned long loops = msecs_to_loops(5);
do {
/* Until Manager is Idle */
if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
break;
cpu_relax();
} while (--loops);
if (!loops)
return true;
return false;
}
static inline void _execute_DBGINSN(struct pl330_thread *thrd,
u8 insn[], bool as_manager)
{
void __iomem *regs = thrd->dmac->pinfo->base;
u32 val;
val = (insn[0] << 16) | (insn[1] << 24);
if (!as_manager) {
val |= (1 << 0);
val |= (thrd->id << 8); /* Channel Number */
}
writel(val, regs + DBGINST0);
val = *((u32 *)&insn[2]);
writel(val, regs + DBGINST1);
/* If timed out due to halted state-machine */
if (_until_dmac_idle(thrd)) {
dev_err(thrd->dmac->pinfo->dev, "DMAC halted!\n");
return;
}
/* Get going */
writel(0, regs + DBGCMD);
}
/*
* Mark a _pl330_req as free.
* We do it by writing DMAEND as the first instruction
* because no valid request is going to have DMAEND as
* its first instruction to execute.
*/
static void mark_free(struct pl330_thread *thrd, int idx)
{
struct _pl330_req *req = &thrd->req[idx];
_emit_END(0, req->mc_cpu);
req->mc_len = 0;
thrd->req_running = -1;
}
static inline u32 _state(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->pinfo->base;
u32 val;
if (is_manager(thrd))
val = readl(regs + DS) & 0xf;
else
val = readl(regs + CS(thrd->id)) & 0xf;
switch (val) {
case DS_ST_STOP:
return PL330_STATE_STOPPED;
case DS_ST_EXEC:
return PL330_STATE_EXECUTING;
case DS_ST_CMISS:
return PL330_STATE_CACHEMISS;
case DS_ST_UPDTPC:
return PL330_STATE_UPDTPC;
case DS_ST_WFE:
return PL330_STATE_WFE;
case DS_ST_FAULT:
return PL330_STATE_FAULTING;
case DS_ST_ATBRR:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_ATBARRIER;
case DS_ST_QBUSY:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_QUEUEBUSY;
case DS_ST_WFP:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_WFP;
case DS_ST_KILL:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_KILLING;
case DS_ST_CMPLT:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_COMPLETING;
case DS_ST_FLTCMP:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_FAULT_COMPLETING;
default:
return PL330_STATE_INVALID;
}
}
static void _stop(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->pinfo->base;
u8 insn[6] = {0, 0, 0, 0, 0, 0};
if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
/* Return if nothing needs to be done */
if (_state(thrd) == PL330_STATE_COMPLETING
|| _state(thrd) == PL330_STATE_KILLING
|| _state(thrd) == PL330_STATE_STOPPED)
return;
_emit_KILL(0, insn);
/* Stop generating interrupts for SEV */
writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN);
_execute_DBGINSN(thrd, insn, is_manager(thrd));
}
/* Start doing req 'idx' of thread 'thrd' */
static bool _trigger(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->pinfo->base;
struct _pl330_req *req;
struct pl330_req *r;
struct _arg_GO go;
unsigned ns;
u8 insn[6] = {0, 0, 0, 0, 0, 0};
int idx;
/* Return if already ACTIVE */
if (_state(thrd) != PL330_STATE_STOPPED)
return true;
idx = 1 - thrd->lstenq;
if (!IS_FREE(&thrd->req[idx]))
req = &thrd->req[idx];
else {
idx = thrd->lstenq;
if (!IS_FREE(&thrd->req[idx]))
req = &thrd->req[idx];
else
req = NULL;
}
/* Return if no request */
if (!req || !req->r)
return true;
r = req->r;
if (r->cfg)
ns = r->cfg->nonsecure ? 1 : 0;
else if (readl(regs + CS(thrd->id)) & CS_CNS)
ns = 1;
else
ns = 0;
/* See 'Abort Sources' point-4 at Page 2-25 */
if (_manager_ns(thrd) && !ns)
dev_info(thrd->dmac->pinfo->dev, "%s:%d Recipe for ABORT!\n",
__func__, __LINE__);
go.chan = thrd->id;
go.addr = req->mc_bus;
go.ns = ns;
_emit_GO(0, insn, &go);
/* Set to generate interrupts for SEV */
writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
/* Only manager can execute GO */
_execute_DBGINSN(thrd, insn, true);
thrd->req_running = idx;
return true;
}
static bool _start(struct pl330_thread *thrd)
{
switch (_state(thrd)) {
case PL330_STATE_FAULT_COMPLETING:
UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
if (_state(thrd) == PL330_STATE_KILLING)
UNTIL(thrd, PL330_STATE_STOPPED)
case PL330_STATE_FAULTING:
_stop(thrd);
case PL330_STATE_KILLING:
case PL330_STATE_COMPLETING:
UNTIL(thrd, PL330_STATE_STOPPED)
case PL330_STATE_STOPPED:
return _trigger(thrd);
case PL330_STATE_WFP:
case PL330_STATE_QUEUEBUSY:
case PL330_STATE_ATBARRIER:
case PL330_STATE_UPDTPC:
case PL330_STATE_CACHEMISS:
case PL330_STATE_EXECUTING:
return true;
case PL330_STATE_WFE: /* For RESUME, nothing yet */
default:
return false;
}
}
static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
struct pl330_config *pcfg = pxs->r->cfg->pcfg;
/* check lock-up free version */
if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) {
while (cyc--) {
off += _emit_LD(dry_run, &buf[off], ALWAYS);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
}
} else {
while (cyc--) {
off += _emit_LD(dry_run, &buf[off], ALWAYS);
off += _emit_RMB(dry_run, &buf[off]);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
off += _emit_WMB(dry_run, &buf[off]);
}
}
return off;
}
static inline int _ldst_devtomem(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
while (cyc--) {
off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->r->peri);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
}
return off;
}
static inline int _ldst_memtodev(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
while (cyc--) {
off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
off += _emit_LD(dry_run, &buf[off], ALWAYS);
off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->r->peri);
off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
}
return off;
}
static int _bursts(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
switch (pxs->r->rqtype) {
case MEMTODEV:
off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc);
break;
case DEVTOMEM:
off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc);
break;
case MEMTOMEM:
off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
break;
default:
off += 0x40000000; /* Scare off the Client */
break;
}
return off;
}
/* Returns bytes consumed and updates bursts */
static inline int _loop(unsigned dry_run, u8 buf[],
unsigned long *bursts, const struct _xfer_spec *pxs)
{
int cyc, cycmax, szlp, szlpend, szbrst, off;
unsigned lcnt0, lcnt1, ljmp0, ljmp1;
struct _arg_LPEND lpend;
/* Max iterations possible in DMALP is 256 */
if (*bursts >= 256*256) {
lcnt1 = 256;
lcnt0 = 256;
cyc = *bursts / lcnt1 / lcnt0;
} else if (*bursts > 256) {
lcnt1 = 256;
lcnt0 = *bursts / lcnt1;
cyc = 1;
} else {
lcnt1 = *bursts;
lcnt0 = 0;
cyc = 1;
}
szlp = _emit_LP(1, buf, 0, 0);
szbrst = _bursts(1, buf, pxs, 1);
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 0;
lpend.bjump = 0;
szlpend = _emit_LPEND(1, buf, &lpend);
if (lcnt0) {
szlp *= 2;
szlpend *= 2;
}
/*
* Max bursts that we can unroll due to limit on the
* size of backward jump that can be encoded in DMALPEND
* which is 8-bits and hence 255
*/
cycmax = (255 - (szlp + szlpend)) / szbrst;
cyc = (cycmax < cyc) ? cycmax : cyc;
off = 0;
if (lcnt0) {
off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
ljmp0 = off;
}
off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
ljmp1 = off;
off += _bursts(dry_run, &buf[off], pxs, cyc);
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 1;
lpend.bjump = off - ljmp1;
off += _emit_LPEND(dry_run, &buf[off], &lpend);
if (lcnt0) {
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 0;
lpend.bjump = off - ljmp0;
off += _emit_LPEND(dry_run, &buf[off], &lpend);
}
*bursts = lcnt1 * cyc;
if (lcnt0)
*bursts *= lcnt0;
return off;
}
static inline int _setup_loops(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = pxs->x;
u32 ccr = pxs->ccr;
unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
int off = 0;
while (bursts) {
c = bursts;
off += _loop(dry_run, &buf[off], &c, pxs);
bursts -= c;
}
return off;
}
static inline int _setup_xfer(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = pxs->x;
int off = 0;
/* DMAMOV SAR, x->src_addr */
off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
/* DMAMOV DAR, x->dst_addr */
off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
/* Setup Loop(s) */
off += _setup_loops(dry_run, &buf[off], pxs);
return off;
}
/*
* A req is a sequence of one or more xfer units.
* Returns the number of bytes taken to setup the MC for the req.
*/
static int _setup_req(unsigned dry_run, struct pl330_thread *thrd,
unsigned index, struct _xfer_spec *pxs)
{
struct _pl330_req *req = &thrd->req[index];
struct pl330_xfer *x;
u8 *buf = req->mc_cpu;
int off = 0;
PL330_DBGMC_START(req->mc_bus);
/* DMAMOV CCR, ccr */
off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
x = pxs->r->x;
do {
/* Error if xfer length is not aligned at burst size */
if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
return -EINVAL;
pxs->x = x;
off += _setup_xfer(dry_run, &buf[off], pxs);
x = x->next;
} while (x);
/* DMASEV peripheral/event */
off += _emit_SEV(dry_run, &buf[off], thrd->ev);
/* DMAEND */
off += _emit_END(dry_run, &buf[off]);
return off;
}
static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
{
u32 ccr = 0;
if (rqc->src_inc)
ccr |= CC_SRCINC;
if (rqc->dst_inc)
ccr |= CC_DSTINC;
/* We set same protection levels for Src and DST for now */
if (rqc->privileged)
ccr |= CC_SRCPRI | CC_DSTPRI;
if (rqc->nonsecure)
ccr |= CC_SRCNS | CC_DSTNS;
if (rqc->insnaccess)
ccr |= CC_SRCIA | CC_DSTIA;
ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
ccr |= (rqc->swap << CC_SWAP_SHFT);
return ccr;
}
static inline bool _is_valid(u32 ccr)
{
enum pl330_dstcachectrl dcctl;
enum pl330_srccachectrl scctl;
dcctl = (ccr >> CC_DSTCCTRL_SHFT) & CC_DRCCCTRL_MASK;
scctl = (ccr >> CC_SRCCCTRL_SHFT) & CC_SRCCCTRL_MASK;
if (dcctl == DINVALID1 || dcctl == DINVALID2
|| scctl == SINVALID1 || scctl == SINVALID2)
return false;
else
return true;
}
/*
* Submit a list of xfers after which the client wants notification.
* Client is not notified after each xfer unit, just once after all
* xfer units are done or some error occurs.
*/
static int pl330_submit_req(void *ch_id, struct pl330_req *r)
{
struct pl330_thread *thrd = ch_id;
struct pl330_dmac *pl330;
struct pl330_info *pi;
struct _xfer_spec xs;
unsigned long flags;
void __iomem *regs;
unsigned idx;
u32 ccr;
int ret = 0;
/* No Req or Unacquired Channel or DMAC */
if (!r || !thrd || thrd->free)
return -EINVAL;
pl330 = thrd->dmac;
pi = pl330->pinfo;
regs = pi->base;
if (pl330->state == DYING
|| pl330->dmac_tbd.reset_chan & (1 << thrd->id)) {
dev_info(thrd->dmac->pinfo->dev, "%s:%d\n",
__func__, __LINE__);
return -EAGAIN;
}
/* If request for non-existing peripheral */
if (r->rqtype != MEMTOMEM && r->peri >= pi->pcfg.num_peri) {
dev_info(thrd->dmac->pinfo->dev,
"%s:%d Invalid peripheral(%u)!\n",
__func__, __LINE__, r->peri);
return -EINVAL;
}
spin_lock_irqsave(&pl330->lock, flags);
if (_queue_full(thrd)) {
ret = -EAGAIN;
goto xfer_exit;
}
/* Use last settings, if not provided */
if (r->cfg) {
/* Prefer Secure Channel */
if (!_manager_ns(thrd))
r->cfg->nonsecure = 0;
else
r->cfg->nonsecure = 1;
ccr = _prepare_ccr(r->cfg);
} else {
ccr = readl(regs + CC(thrd->id));
}
/* If this req doesn't have valid xfer settings */
if (!_is_valid(ccr)) {
ret = -EINVAL;
dev_info(thrd->dmac->pinfo->dev, "%s:%d Invalid CCR(%x)!\n",
__func__, __LINE__, ccr);
goto xfer_exit;
}
idx = IS_FREE(&thrd->req[0]) ? 0 : 1;
xs.ccr = ccr;
xs.r = r;
/* First dry run to check if req is acceptable */
ret = _setup_req(1, thrd, idx, &xs);
if (ret < 0)
goto xfer_exit;
if (ret > pi->mcbufsz / 2) {
dev_info(thrd->dmac->pinfo->dev,
"%s:%d Trying increasing mcbufsz\n",
__func__, __LINE__);
ret = -ENOMEM;
goto xfer_exit;
}
/* Hook the request */
thrd->lstenq = idx;
thrd->req[idx].mc_len = _setup_req(0, thrd, idx, &xs);
thrd->req[idx].r = r;
ret = 0;
xfer_exit:
spin_unlock_irqrestore(&pl330->lock, flags);
return ret;
}
static void pl330_dotask(unsigned long data)
{
struct pl330_dmac *pl330 = (struct pl330_dmac *) data;
struct pl330_info *pi = pl330->pinfo;
unsigned long flags;
int i;
spin_lock_irqsave(&pl330->lock, flags);
/* The DMAC itself gone nuts */
if (pl330->dmac_tbd.reset_dmac) {
pl330->state = DYING;
/* Reset the manager too */
pl330->dmac_tbd.reset_mngr = true;
/* Clear the reset flag */
pl330->dmac_tbd.reset_dmac = false;
}
if (pl330->dmac_tbd.reset_mngr) {
_stop(pl330->manager);
/* Reset all channels */
pl330->dmac_tbd.reset_chan = (1 << pi->pcfg.num_chan) - 1;
/* Clear the reset flag */
pl330->dmac_tbd.reset_mngr = false;
}
for (i = 0; i < pi->pcfg.num_chan; i++) {
if (pl330->dmac_tbd.reset_chan & (1 << i)) {
struct pl330_thread *thrd = &pl330->channels[i];
void __iomem *regs = pi->base;
enum pl330_op_err err;
_stop(thrd);
if (readl(regs + FSC) & (1 << thrd->id))
err = PL330_ERR_FAIL;
else
err = PL330_ERR_ABORT;
spin_unlock_irqrestore(&pl330->lock, flags);
_callback(thrd->req[1 - thrd->lstenq].r, err);
_callback(thrd->req[thrd->lstenq].r, err);
spin_lock_irqsave(&pl330->lock, flags);
thrd->req[0].r = NULL;
thrd->req[1].r = NULL;
mark_free(thrd, 0);
mark_free(thrd, 1);
/* Clear the reset flag */
pl330->dmac_tbd.reset_chan &= ~(1 << i);
}
}
spin_unlock_irqrestore(&pl330->lock, flags);
return;
}
/* Returns 1 if state was updated, 0 otherwise */
static int pl330_update(const struct pl330_info *pi)
{
struct pl330_req *rqdone, *tmp;
struct pl330_dmac *pl330;
unsigned long flags;
void __iomem *regs;
u32 val;
int id, ev, ret = 0;
if (!pi || !pi->pl330_data)
return 0;
regs = pi->base;
pl330 = pi->pl330_data;
spin_lock_irqsave(&pl330->lock, flags);
val = readl(regs + FSM) & 0x1;
if (val)
pl330->dmac_tbd.reset_mngr = true;
else
pl330->dmac_tbd.reset_mngr = false;
val = readl(regs + FSC) & ((1 << pi->pcfg.num_chan) - 1);
pl330->dmac_tbd.reset_chan |= val;
if (val) {
int i = 0;
while (i < pi->pcfg.num_chan) {
if (val & (1 << i)) {
dev_info(pi->dev,
"Reset Channel-%d\t CS-%x FTC-%x\n",
i, readl(regs + CS(i)),
readl(regs + FTC(i)));
_stop(&pl330->channels[i]);
}
i++;
}
}
/* Check which event happened i.e, thread notified */
val = readl(regs + ES);
if (pi->pcfg.num_events < 32
&& val & ~((1 << pi->pcfg.num_events) - 1)) {
pl330->dmac_tbd.reset_dmac = true;
dev_err(pi->dev, "%s:%d Unexpected!\n", __func__, __LINE__);
ret = 1;
goto updt_exit;
}
for (ev = 0; ev < pi->pcfg.num_events; ev++) {
if (val & (1 << ev)) { /* Event occurred */
struct pl330_thread *thrd;
u32 inten = readl(regs + INTEN);
int active;
/* Clear the event */
if (inten & (1 << ev))
writel(1 << ev, regs + INTCLR);
ret = 1;
id = pl330->events[ev];
thrd = &pl330->channels[id];
active = thrd->req_running;
if (active == -1) /* Aborted */
continue;
/* Detach the req */
rqdone = thrd->req[active].r;
thrd->req[active].r = NULL;
mark_free(thrd, active);
/* Get going again ASAP */
_start(thrd);
/* For now, just make a list of callbacks to be done */
list_add_tail(&rqdone->rqd, &pl330->req_done);
}
}
/* Now that we are in no hurry, do the callbacks */
list_for_each_entry_safe(rqdone, tmp, &pl330->req_done, rqd) {
list_del(&rqdone->rqd);
spin_unlock_irqrestore(&pl330->lock, flags);
_callback(rqdone, PL330_ERR_NONE);
spin_lock_irqsave(&pl330->lock, flags);
}
updt_exit:
spin_unlock_irqrestore(&pl330->lock, flags);
if (pl330->dmac_tbd.reset_dmac
|| pl330->dmac_tbd.reset_mngr
|| pl330->dmac_tbd.reset_chan) {
ret = 1;
tasklet_schedule(&pl330->tasks);
}
return ret;
}
static int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op)
{
struct pl330_thread *thrd = ch_id;
struct pl330_dmac *pl330;
unsigned long flags;
int ret = 0, active;
if (!thrd || thrd->free || thrd->dmac->state == DYING)
return -EINVAL;
pl330 = thrd->dmac;
active = thrd->req_running;
spin_lock_irqsave(&pl330->lock, flags);
switch (op) {
case PL330_OP_FLUSH:
/* Make sure the channel is stopped */
_stop(thrd);
thrd->req[0].r = NULL;
thrd->req[1].r = NULL;
mark_free(thrd, 0);
mark_free(thrd, 1);
break;
case PL330_OP_ABORT:
/* Make sure the channel is stopped */
_stop(thrd);
/* ABORT is only for the active req */
if (active == -1)
break;
thrd->req[active].r = NULL;
mark_free(thrd, active);
/* Start the next */
case PL330_OP_START:
if ((active == -1) && !_start(thrd))
ret = -EIO;
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&pl330->lock, flags);
return ret;
}
/* Reserve an event */
static inline int _alloc_event(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
struct pl330_info *pi = pl330->pinfo;
int ev;
for (ev = 0; ev < pi->pcfg.num_events; ev++)
if (pl330->events[ev] == -1) {
pl330->events[ev] = thrd->id;
return ev;
}
return -1;
}
static bool _chan_ns(const struct pl330_info *pi, int i)
{
return pi->pcfg.irq_ns & (1 << i);
}
/* Upon success, returns IdentityToken for the
* allocated channel, NULL otherwise.
*/
static void *pl330_request_channel(const struct pl330_info *pi)
{
struct pl330_thread *thrd = NULL;
struct pl330_dmac *pl330;
unsigned long flags;
int chans, i;
if (!pi || !pi->pl330_data)
return NULL;
pl330 = pi->pl330_data;
if (pl330->state == DYING)
return NULL;
chans = pi->pcfg.num_chan;
spin_lock_irqsave(&pl330->lock, flags);
for (i = 0; i < chans; i++) {
thrd = &pl330->channels[i];
if ((thrd->free) && (!_manager_ns(thrd) ||
_chan_ns(pi, i))) {
thrd->ev = _alloc_event(thrd);
if (thrd->ev >= 0) {
thrd->free = false;
thrd->lstenq = 1;
thrd->req[0].r = NULL;
mark_free(thrd, 0);
thrd->req[1].r = NULL;
mark_free(thrd, 1);
break;
}
}
thrd = NULL;
}
spin_unlock_irqrestore(&pl330->lock, flags);
return thrd;
}
/* Release an event */
static inline void _free_event(struct pl330_thread *thrd, int ev)
{
struct pl330_dmac *pl330 = thrd->dmac;
struct pl330_info *pi = pl330->pinfo;
/* If the event is valid and was held by the thread */
if (ev >= 0 && ev < pi->pcfg.num_events
&& pl330->events[ev] == thrd->id)
pl330->events[ev] = -1;
}
static void pl330_release_channel(void *ch_id)
{
struct pl330_thread *thrd = ch_id;
struct pl330_dmac *pl330;
unsigned long flags;
if (!thrd || thrd->free)
return;
_stop(thrd);
_callback(thrd->req[1 - thrd->lstenq].r, PL330_ERR_ABORT);
_callback(thrd->req[thrd->lstenq].r, PL330_ERR_ABORT);
pl330 = thrd->dmac;
spin_lock_irqsave(&pl330->lock, flags);
_free_event(thrd, thrd->ev);
thrd->free = true;
spin_unlock_irqrestore(&pl330->lock, flags);
}
/* Initialize the structure for PL330 configuration, that can be used
* by the client driver the make best use of the DMAC
*/
static void read_dmac_config(struct pl330_info *pi)
{
void __iomem *regs = pi->base;
u32 val;
val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
val &= CRD_DATA_WIDTH_MASK;
pi->pcfg.data_bus_width = 8 * (1 << val);
val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
val &= CRD_DATA_BUFF_MASK;
pi->pcfg.data_buf_dep = val + 1;
val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
val &= CR0_NUM_CHANS_MASK;
val += 1;
pi->pcfg.num_chan = val;
val = readl(regs + CR0);
if (val & CR0_PERIPH_REQ_SET) {
val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
val += 1;
pi->pcfg.num_peri = val;
pi->pcfg.peri_ns = readl(regs + CR4);
} else {
pi->pcfg.num_peri = 0;
}
val = readl(regs + CR0);
if (val & CR0_BOOT_MAN_NS)
pi->pcfg.mode |= DMAC_MODE_NS;
else
pi->pcfg.mode &= ~DMAC_MODE_NS;
val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
val &= CR0_NUM_EVENTS_MASK;
val += 1;
pi->pcfg.num_events = val;
pi->pcfg.irq_ns = readl(regs + CR3);
pi->pcfg.periph_id = get_id(pi, PERIPH_ID);
pi->pcfg.pcell_id = get_id(pi, PCELL_ID);
}
static inline void _reset_thread(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
struct pl330_info *pi = pl330->pinfo;
thrd->req[0].mc_cpu = pl330->mcode_cpu
+ (thrd->id * pi->mcbufsz);
thrd->req[0].mc_bus = pl330->mcode_bus
+ (thrd->id * pi->mcbufsz);
thrd->req[0].r = NULL;
mark_free(thrd, 0);
thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
+ pi->mcbufsz / 2;
thrd->req[1].mc_bus = thrd->req[0].mc_bus
+ pi->mcbufsz / 2;
thrd->req[1].r = NULL;
mark_free(thrd, 1);
}
static int dmac_alloc_threads(struct pl330_dmac *pl330)
{
struct pl330_info *pi = pl330->pinfo;
int chans = pi->pcfg.num_chan;
struct pl330_thread *thrd;
int i;
/* Allocate 1 Manager and 'chans' Channel threads */
pl330->channels = kzalloc((1 + chans) * sizeof(*thrd),
GFP_KERNEL);
if (!pl330->channels)
return -ENOMEM;
/* Init Channel threads */
for (i = 0; i < chans; i++) {
thrd = &pl330->channels[i];
thrd->id = i;
thrd->dmac = pl330;
_reset_thread(thrd);
thrd->free = true;
}
/* MANAGER is indexed at the end */
thrd = &pl330->channels[chans];
thrd->id = chans;
thrd->dmac = pl330;
thrd->free = false;
pl330->manager = thrd;
return 0;
}
static int dmac_alloc_resources(struct pl330_dmac *pl330)
{
struct pl330_info *pi = pl330->pinfo;
int chans = pi->pcfg.num_chan;
int ret;
/*
* Alloc MicroCode buffer for 'chans' Channel threads.
* A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
*/
pl330->mcode_cpu = dma_alloc_coherent(pi->dev,
chans * pi->mcbufsz,
&pl330->mcode_bus, GFP_KERNEL);
if (!pl330->mcode_cpu) {
dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
__func__, __LINE__);
return -ENOMEM;
}
ret = dmac_alloc_threads(pl330);
if (ret) {
dev_err(pi->dev, "%s:%d Can't to create channels for DMAC!\n",
__func__, __LINE__);
dma_free_coherent(pi->dev,
chans * pi->mcbufsz,
pl330->mcode_cpu, pl330->mcode_bus);
return ret;
}
return 0;
}
static int pl330_add(struct pl330_info *pi)
{
struct pl330_dmac *pl330;
void __iomem *regs;
int i, ret;
if (!pi || !pi->dev)
return -EINVAL;
/* If already added */
if (pi->pl330_data)
return -EINVAL;
/*
* If the SoC can perform reset on the DMAC, then do it
* before reading its configuration.
*/
if (pi->dmac_reset)
pi->dmac_reset(pi);
regs = pi->base;
/* Check if we can handle this DMAC */
if ((get_id(pi, PERIPH_ID) & 0xfffff) != PERIPH_ID_VAL
|| get_id(pi, PCELL_ID) != PCELL_ID_VAL) {
dev_err(pi->dev, "PERIPH_ID 0x%x, PCELL_ID 0x%x !\n",
get_id(pi, PERIPH_ID), get_id(pi, PCELL_ID));
return -EINVAL;
}
/* Read the configuration of the DMAC */
read_dmac_config(pi);
if (pi->pcfg.num_events == 0) {
dev_err(pi->dev, "%s:%d Can't work without events!\n",
__func__, __LINE__);
return -EINVAL;
}
pl330 = kzalloc(sizeof(*pl330), GFP_KERNEL);
if (!pl330) {
dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
__func__, __LINE__);
return -ENOMEM;
}
/* Assign the info structure and private data */
pl330->pinfo = pi;
pi->pl330_data = pl330;
spin_lock_init(&pl330->lock);
INIT_LIST_HEAD(&pl330->req_done);
/* Use default MC buffer size if not provided */
if (!pi->mcbufsz)
pi->mcbufsz = MCODE_BUFF_PER_REQ * 2;
/* Mark all events as free */
for (i = 0; i < pi->pcfg.num_events; i++)
pl330->events[i] = -1;
/* Allocate resources needed by the DMAC */
ret = dmac_alloc_resources(pl330);
if (ret) {
dev_err(pi->dev, "Unable to create channels for DMAC\n");
kfree(pl330);
return ret;
}
tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330);
pl330->state = INIT;
return 0;
}
static int dmac_free_threads(struct pl330_dmac *pl330)
{
struct pl330_info *pi = pl330->pinfo;
int chans = pi->pcfg.num_chan;
struct pl330_thread *thrd;
int i;
/* Release Channel threads */
for (i = 0; i < chans; i++) {
thrd = &pl330->channels[i];
pl330_release_channel((void *)thrd);
}
/* Free memory */
kfree(pl330->channels);
return 0;
}
static void dmac_free_resources(struct pl330_dmac *pl330)
{
struct pl330_info *pi = pl330->pinfo;
int chans = pi->pcfg.num_chan;
dmac_free_threads(pl330);
dma_free_coherent(pi->dev, chans * pi->mcbufsz,
pl330->mcode_cpu, pl330->mcode_bus);
}
static void pl330_del(struct pl330_info *pi)
{
struct pl330_dmac *pl330;
if (!pi || !pi->pl330_data)
return;
pl330 = pi->pl330_data;
pl330->state = UNINIT;
tasklet_kill(&pl330->tasks);
/* Free DMAC resources */
dmac_free_resources(pl330);
kfree(pl330);
pi->pl330_data = NULL;
}
/* forward declaration */
static struct amba_driver pl330_driver;
static inline struct dma_pl330_chan *
to_pchan(struct dma_chan *ch)
{
if (!ch)
return NULL;
return container_of(ch, struct dma_pl330_chan, chan);
}
static inline struct dma_pl330_desc *
to_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct dma_pl330_desc, txd);
}
static inline void free_desc_list(struct list_head *list)
{
struct dma_pl330_dmac *pdmac;
struct dma_pl330_desc *desc;
struct dma_pl330_chan *pch = NULL;
unsigned long flags;
/* Finish off the work list */
list_for_each_entry(desc, list, node) {
dma_async_tx_callback callback;
void *param;
/* All desc in a list belong to same channel */
pch = desc->pchan;
callback = desc->txd.callback;
param = desc->txd.callback_param;
if (callback)
callback(param);
desc->pchan = NULL;
}
/* pch will be unset if list was empty */
if (!pch)
return;
pdmac = pch->dmac;
spin_lock_irqsave(&pdmac->pool_lock, flags);
list_splice_tail_init(list, &pdmac->desc_pool);
spin_unlock_irqrestore(&pdmac->pool_lock, flags);
}
static inline void handle_cyclic_desc_list(struct list_head *list)
{
struct dma_pl330_desc *desc;
struct dma_pl330_chan *pch = NULL;
unsigned long flags;
list_for_each_entry(desc, list, node) {
dma_async_tx_callback callback;
/* Change status to reload it */
desc->status = PREP;
pch = desc->pchan;
callback = desc->txd.callback;
if (callback)
callback(desc->txd.callback_param);
}
/* pch will be unset if list was empty */
if (!pch)
return;
spin_lock_irqsave(&pch->lock, flags);
list_splice_tail_init(list, &pch->work_list);
spin_unlock_irqrestore(&pch->lock, flags);
}
static inline void fill_queue(struct dma_pl330_chan *pch)
{
struct dma_pl330_desc *desc;
int ret;
list_for_each_entry(desc, &pch->work_list, node) {
/* If already submitted */
if (desc->status == BUSY)
break;
ret = pl330_submit_req(pch->pl330_chid,
&desc->req);
if (!ret) {
desc->status = BUSY;
break;
} else if (ret == -EAGAIN) {
/* QFull or DMAC Dying */
break;
} else {
/* Unacceptable request */
desc->status = DONE;
dev_err(pch->dmac->pif.dev, "%s:%d Bad Desc(%d)\n",
__func__, __LINE__, desc->txd.cookie);
tasklet_schedule(&pch->task);
}
}
}
static void pl330_tasklet(unsigned long data)
{
struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
struct dma_pl330_desc *desc, *_dt;
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&pch->lock, flags);
/* Pick up ripe tomatoes */
list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
if (desc->status == DONE) {
if (!pch->cyclic)
dma_cookie_complete(&desc->txd);
list_move_tail(&desc->node, &list);
}
/* Try to submit a req imm. next to the last completed cookie */
fill_queue(pch);
/* Make sure the PL330 Channel thread is active */
pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START);
spin_unlock_irqrestore(&pch->lock, flags);
if (pch->cyclic)
handle_cyclic_desc_list(&list);
else
free_desc_list(&list);
}
static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
{
struct dma_pl330_desc *desc = token;
struct dma_pl330_chan *pch = desc->pchan;
unsigned long flags;
/* If desc aborted */
if (!pch)
return;
spin_lock_irqsave(&pch->lock, flags);
desc->status = DONE;
spin_unlock_irqrestore(&pch->lock, flags);
tasklet_schedule(&pch->task);
}
bool pl330_filter(struct dma_chan *chan, void *param)
{
u8 *peri_id;
if (chan->device->dev->driver != &pl330_driver.drv)
return false;
#ifdef CONFIG_OF
if (chan->device->dev->of_node) {
const __be32 *prop_value;
phandle phandle;
struct device_node *node;
prop_value = ((struct property *)param)->value;
phandle = be32_to_cpup(prop_value++);
node = of_find_node_by_phandle(phandle);
return ((chan->private == node) &&
(chan->chan_id == be32_to_cpup(prop_value)));
}
#endif
peri_id = chan->private;
return *peri_id == (unsigned)param;
}
EXPORT_SYMBOL(pl330_filter);
static int pl330_alloc_chan_resources(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct dma_pl330_dmac *pdmac = pch->dmac;
unsigned long flags;
spin_lock_irqsave(&pch->lock, flags);
dma_cookie_init(chan);
pch->cyclic = false;
pch->pl330_chid = pl330_request_channel(&pdmac->pif);
if (!pch->pl330_chid) {
spin_unlock_irqrestore(&pch->lock, flags);
return 0;
}
tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch);
spin_unlock_irqrestore(&pch->lock, flags);
return 1;
}
static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct dma_pl330_desc *desc, *_dt;
unsigned long flags;
struct dma_pl330_dmac *pdmac = pch->dmac;
struct dma_slave_config *slave_config;
LIST_HEAD(list);
switch (cmd) {
case DMA_TERMINATE_ALL:
spin_lock_irqsave(&pch->lock, flags);
/* FLUSH the PL330 Channel thread */
pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
/* Mark all desc done */
list_for_each_entry_safe(desc, _dt, &pch->work_list , node) {
desc->status = DONE;
list_move_tail(&desc->node, &list);
}
list_splice_tail_init(&list, &pdmac->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
break;
case DMA_SLAVE_CONFIG:
slave_config = (struct dma_slave_config *)arg;
if (slave_config->direction == DMA_MEM_TO_DEV) {
if (slave_config->dst_addr)
pch->fifo_addr = slave_config->dst_addr;
if (slave_config->dst_addr_width)
pch->burst_sz = __ffs(slave_config->dst_addr_width);
if (slave_config->dst_maxburst)
pch->burst_len = slave_config->dst_maxburst;
} else if (slave_config->direction == DMA_DEV_TO_MEM) {
if (slave_config->src_addr)
pch->fifo_addr = slave_config->src_addr;
if (slave_config->src_addr_width)
pch->burst_sz = __ffs(slave_config->src_addr_width);
if (slave_config->src_maxburst)
pch->burst_len = slave_config->src_maxburst;
}
break;
default:
dev_err(pch->dmac->pif.dev, "Not supported command.\n");
return -ENXIO;
}
return 0;
}
static void pl330_free_chan_resources(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
unsigned long flags;
spin_lock_irqsave(&pch->lock, flags);
tasklet_kill(&pch->task);
pl330_release_channel(pch->pl330_chid);
pch->pl330_chid = NULL;
if (pch->cyclic)
list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
}
static enum dma_status
pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
static void pl330_issue_pending(struct dma_chan *chan)
{
pl330_tasklet((unsigned long) to_pchan(chan));
}
/*
* We returned the last one of the circular list of descriptor(s)
* from prep_xxx, so the argument to submit corresponds to the last
* descriptor of the list.
*/
static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct dma_pl330_desc *desc, *last = to_desc(tx);
struct dma_pl330_chan *pch = to_pchan(tx->chan);
dma_cookie_t cookie;
unsigned long flags;
spin_lock_irqsave(&pch->lock, flags);
/* Assign cookies to all nodes */
while (!list_empty(&last->node)) {
desc = list_entry(last->node.next, struct dma_pl330_desc, node);
dma_cookie_assign(&desc->txd);
list_move_tail(&desc->node, &pch->work_list);
}
cookie = dma_cookie_assign(&last->txd);
list_add_tail(&last->node, &pch->work_list);
spin_unlock_irqrestore(&pch->lock, flags);
return cookie;
}
static inline void _init_desc(struct dma_pl330_desc *desc)
{
desc->pchan = NULL;
desc->req.x = &desc->px;
desc->req.token = desc;
desc->rqcfg.swap = SWAP_NO;
desc->rqcfg.privileged = 0;
desc->rqcfg.insnaccess = 0;
desc->rqcfg.scctl = SCCTRL0;
desc->rqcfg.dcctl = DCCTRL0;
desc->req.cfg = &desc->rqcfg;
desc->req.xfer_cb = dma_pl330_rqcb;
desc->txd.tx_submit = pl330_tx_submit;
INIT_LIST_HEAD(&desc->node);
}
/* Returns the number of descriptors added to the DMAC pool */
static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
{
struct dma_pl330_desc *desc;
unsigned long flags;
int i;
if (!pdmac)
return 0;
desc = kmalloc(count * sizeof(*desc), flg);
if (!desc)
return 0;
spin_lock_irqsave(&pdmac->pool_lock, flags);
for (i = 0; i < count; i++) {
_init_desc(&desc[i]);
list_add_tail(&desc[i].node, &pdmac->desc_pool);
}
spin_unlock_irqrestore(&pdmac->pool_lock, flags);
return count;
}
static struct dma_pl330_desc *
pluck_desc(struct dma_pl330_dmac *pdmac)
{
struct dma_pl330_desc *desc = NULL;
unsigned long flags;
if (!pdmac)
return NULL;
spin_lock_irqsave(&pdmac->pool_lock, flags);
if (!list_empty(&pdmac->desc_pool)) {
desc = list_entry(pdmac->desc_pool.next,
struct dma_pl330_desc, node);
list_del_init(&desc->node);
desc->status = PREP;
desc->txd.callback = NULL;
}
spin_unlock_irqrestore(&pdmac->pool_lock, flags);
return desc;
}
static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
{
struct dma_pl330_dmac *pdmac = pch->dmac;
u8 *peri_id = pch->chan.private;
struct dma_pl330_desc *desc;
/* Pluck one desc from the pool of DMAC */
desc = pluck_desc(pdmac);
/* If the DMAC pool is empty, alloc new */
if (!desc) {
if (!add_desc(pdmac, GFP_ATOMIC, 1))
return NULL;
/* Try again */
desc = pluck_desc(pdmac);
if (!desc) {
dev_err(pch->dmac->pif.dev,
"%s:%d ALERT!\n", __func__, __LINE__);
return NULL;
}
}
/* Initialize the descriptor */
desc->pchan = pch;
desc->txd.cookie = 0;
async_tx_ack(&desc->txd);
desc->req.peri = peri_id ? pch->chan.chan_id : 0;
desc->rqcfg.pcfg = &pch->dmac->pif.pcfg;
dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
return desc;
}
static inline void fill_px(struct pl330_xfer *px,
dma_addr_t dst, dma_addr_t src, size_t len)
{
px->next = NULL;
px->bytes = len;
px->dst_addr = dst;
px->src_addr = src;
}
static struct dma_pl330_desc *
__pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
dma_addr_t src, size_t len)
{
struct dma_pl330_desc *desc = pl330_get_desc(pch);
if (!desc) {
dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
__func__, __LINE__);
return NULL;
}
/*
* Ideally we should lookout for reqs bigger than
* those that can be programmed with 256 bytes of
* MC buffer, but considering a req size is seldom
* going to be word-unaligned and more than 200MB,
* we take it easy.
* Also, should the limit is reached we'd rather
* have the platform increase MC buffer size than
* complicating this API driver.
*/
fill_px(&desc->px, dst, src, len);
return desc;
}
/* Call after fixing burst size */
static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
{
struct dma_pl330_chan *pch = desc->pchan;
struct pl330_info *pi = &pch->dmac->pif;
int burst_len;
burst_len = pi->pcfg.data_bus_width / 8;
burst_len *= pi->pcfg.data_buf_dep;
burst_len >>= desc->rqcfg.brst_size;
/* src/dst_burst_len can't be more than 16 */
if (burst_len > 16)
burst_len = 16;
while (burst_len > 1) {
if (!(len % (burst_len << desc->rqcfg.brst_size)))
break;
burst_len--;
}
return burst_len;
}
static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
size_t period_len, enum dma_transfer_direction direction,
void *context)
{
struct dma_pl330_desc *desc;
struct dma_pl330_chan *pch = to_pchan(chan);
dma_addr_t dst;
dma_addr_t src;
desc = pl330_get_desc(pch);
if (!desc) {
dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
__func__, __LINE__);
return NULL;
}
switch (direction) {
case DMA_MEM_TO_DEV:
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 0;
desc->req.rqtype = MEMTODEV;
src = dma_addr;
dst = pch->fifo_addr;
break;
case DMA_DEV_TO_MEM:
desc->rqcfg.src_inc = 0;
desc->rqcfg.dst_inc = 1;
desc->req.rqtype = DEVTOMEM;
src = pch->fifo_addr;
dst = dma_addr;
break;
default:
dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n",
__func__, __LINE__);
return NULL;
}
desc->rqcfg.brst_size = pch->burst_sz;
desc->rqcfg.brst_len = 1;
pch->cyclic = true;
fill_px(&desc->px, dst, src, period_len);
return &desc->txd;
}
static struct dma_async_tx_descriptor *
pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
{
struct dma_pl330_desc *desc;
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_info *pi;
int burst;
if (unlikely(!pch || !len))
return NULL;
pi = &pch->dmac->pif;
desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
if (!desc)
return NULL;
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 1;
desc->req.rqtype = MEMTOMEM;
/* Select max possible burst size */
burst = pi->pcfg.data_bus_width / 8;
while (burst > 1) {
if (!(len % burst))
break;
burst /= 2;
}
desc->rqcfg.brst_size = 0;
while (burst != (1 << desc->rqcfg.brst_size))
desc->rqcfg.brst_size++;
desc->rqcfg.brst_len = get_burst_len(desc, len);
desc->txd.flags = flags;
return &desc->txd;
}
static struct dma_async_tx_descriptor *
pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flg, void *context)
{
struct dma_pl330_desc *first, *desc = NULL;
struct dma_pl330_chan *pch = to_pchan(chan);
struct scatterlist *sg;
unsigned long flags;
int i;
dma_addr_t addr;
if (unlikely(!pch || !sgl || !sg_len))
return NULL;
addr = pch->fifo_addr;
first = NULL;
for_each_sg(sgl, sg, sg_len, i) {
desc = pl330_get_desc(pch);
if (!desc) {
struct dma_pl330_dmac *pdmac = pch->dmac;
dev_err(pch->dmac->pif.dev,
"%s:%d Unable to fetch desc\n",
__func__, __LINE__);
if (!first)
return NULL;
spin_lock_irqsave(&pdmac->pool_lock, flags);
while (!list_empty(&first->node)) {
desc = list_entry(first->node.next,
struct dma_pl330_desc, node);
list_move_tail(&desc->node, &pdmac->desc_pool);
}
list_move_tail(&first->node, &pdmac->desc_pool);
spin_unlock_irqrestore(&pdmac->pool_lock, flags);
return NULL;
}
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->node);
if (direction == DMA_MEM_TO_DEV) {
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 0;
desc->req.rqtype = MEMTODEV;
fill_px(&desc->px,
addr, sg_dma_address(sg), sg_dma_len(sg));
} else {
desc->rqcfg.src_inc = 0;
desc->rqcfg.dst_inc = 1;
desc->req.rqtype = DEVTOMEM;
fill_px(&desc->px,
sg_dma_address(sg), addr, sg_dma_len(sg));
}
desc->rqcfg.brst_size = pch->burst_sz;
desc->rqcfg.brst_len = 1;
}
/* Return the last desc in the chain */
desc->txd.flags = flg;
return &desc->txd;
}
static irqreturn_t pl330_irq_handler(int irq, void *data)
{
if (pl330_update(data))
return IRQ_HANDLED;
else
return IRQ_NONE;
}
static int __devinit
pl330_probe(struct amba_device *adev, const struct amba_id *id)
{
struct dma_pl330_platdata *pdat;
struct dma_pl330_dmac *pdmac;
struct dma_pl330_chan *pch;
struct pl330_info *pi;
struct dma_device *pd;
struct resource *res;
int i, ret, irq;
int num_chan;
pdat = adev->dev.platform_data;
/* Allocate a new DMAC and its Channels */
pdmac = kzalloc(sizeof(*pdmac), GFP_KERNEL);
if (!pdmac) {
dev_err(&adev->dev, "unable to allocate mem\n");
return -ENOMEM;
}
pi = &pdmac->pif;
pi->dev = &adev->dev;
pi->pl330_data = NULL;
pi->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
res = &adev->res;
request_mem_region(res->start, resource_size(res), "dma-pl330");
pi->base = ioremap(res->start, resource_size(res));
if (!pi->base) {
ret = -ENXIO;
goto probe_err1;
}
pdmac->clk = clk_get(&adev->dev, "dma");
if (IS_ERR(pdmac->clk)) {
dev_err(&adev->dev, "Cannot get operation clock.\n");
ret = -EINVAL;
goto probe_err2;
}
amba_set_drvdata(adev, pdmac);
#ifndef CONFIG_PM_RUNTIME
/* enable dma clk */
clk_enable(pdmac->clk);
#endif
irq = adev->irq[0];
ret = request_irq(irq, pl330_irq_handler, 0,
dev_name(&adev->dev), pi);
if (ret)
goto probe_err3;
ret = pl330_add(pi);
if (ret)
goto probe_err4;
INIT_LIST_HEAD(&pdmac->desc_pool);
spin_lock_init(&pdmac->pool_lock);
/* Create a descriptor pool of default size */
if (!add_desc(pdmac, GFP_KERNEL, NR_DEFAULT_DESC))
dev_warn(&adev->dev, "unable to allocate desc\n");
pd = &pdmac->ddma;
INIT_LIST_HEAD(&pd->channels);
/* Initialize channel parameters */
if (pdat)
num_chan = max_t(int, pdat->nr_valid_peri, pi->pcfg.num_chan);
else
num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan);
pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
if (!pdmac->peripherals) {
ret = -ENOMEM;
dev_err(&adev->dev, "unable to allocate pdmac->peripherals\n");
goto probe_err5;
}
for (i = 0; i < num_chan; i++) {
pch = &pdmac->peripherals[i];
if (!adev->dev.of_node)
pch->chan.private = pdat ? &pdat->peri_id[i] : NULL;
else
pch->chan.private = adev->dev.of_node;
INIT_LIST_HEAD(&pch->work_list);
spin_lock_init(&pch->lock);
pch->pl330_chid = NULL;
pch->chan.device = pd;
pch->dmac = pdmac;
/* Add the channel to the DMAC list */
list_add_tail(&pch->chan.device_node, &pd->channels);
}
pd->dev = &adev->dev;
if (pdat) {
pd->cap_mask = pdat->cap_mask;
} else {
dma_cap_set(DMA_MEMCPY, pd->cap_mask);
if (pi->pcfg.num_peri) {
dma_cap_set(DMA_SLAVE, pd->cap_mask);
dma_cap_set(DMA_CYCLIC, pd->cap_mask);
}
}
pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
pd->device_free_chan_resources = pl330_free_chan_resources;
pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
pd->device_tx_status = pl330_tx_status;
pd->device_prep_slave_sg = pl330_prep_slave_sg;
pd->device_control = pl330_control;
pd->device_issue_pending = pl330_issue_pending;
ret = dma_async_device_register(pd);
if (ret) {
dev_err(&adev->dev, "unable to register DMAC\n");
goto probe_err5;
}
dev_info(&adev->dev,
"Loaded driver for PL330 DMAC-%d\n", adev->periphid);
dev_info(&adev->dev,
"\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
pi->pcfg.data_buf_dep,
pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan,
pi->pcfg.num_peri, pi->pcfg.num_events);
return 0;
probe_err5:
pl330_del(pi);
probe_err4:
free_irq(irq, pi);
probe_err3:
#ifndef CONFIG_PM_RUNTIME
clk_disable(pdmac->clk);
#endif
clk_put(pdmac->clk);
probe_err2:
iounmap(pi->base);
probe_err1:
release_mem_region(res->start, resource_size(res));
kfree(pdmac);
return ret;
}
static int __devexit pl330_remove(struct amba_device *adev)
{
struct dma_pl330_dmac *pdmac = amba_get_drvdata(adev);
struct dma_pl330_chan *pch, *_p;
struct pl330_info *pi;
struct resource *res;
int irq;
if (!pdmac)
return 0;
amba_set_drvdata(adev, NULL);
/* Idle the DMAC */
list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
chan.device_node) {
/* Remove the channel */
list_del(&pch->chan.device_node);
/* Flush the channel */
pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
pl330_free_chan_resources(&pch->chan);
}
pi = &pdmac->pif;
pl330_del(pi);
irq = adev->irq[0];
free_irq(irq, pi);
iounmap(pi->base);
res = &adev->res;
release_mem_region(res->start, resource_size(res));
#ifndef CONFIG_PM_RUNTIME
clk_disable(pdmac->clk);
#endif
kfree(pdmac);
return 0;
}
static struct amba_id pl330_ids[] = {
{
.id = 0x00041330,
.mask = 0x000fffff,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl330_ids);
#ifdef CONFIG_PM_RUNTIME
static int pl330_runtime_suspend(struct device *dev)
{
struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);
if (!pdmac) {
dev_err(dev, "failed to get dmac\n");
return -ENODEV;
}
clk_disable(pdmac->clk);
return 0;
}
static int pl330_runtime_resume(struct device *dev)
{
struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);
if (!pdmac) {
dev_err(dev, "failed to get dmac\n");
return -ENODEV;
}
clk_enable(pdmac->clk);
return 0;
}
#else
#define pl330_runtime_suspend NULL
#define pl330_runtime_resume NULL
#endif /* CONFIG_PM_RUNTIME */
static const struct dev_pm_ops pl330_pm_ops = {
.runtime_suspend = pl330_runtime_suspend,
.runtime_resume = pl330_runtime_resume,
};
static struct amba_driver pl330_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "dma-pl330",
.pm = &pl330_pm_ops,
},
.id_table = pl330_ids,
.probe = pl330_probe,
.remove = pl330_remove,
};
module_amba_driver(pl330_driver);
MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
MODULE_DESCRIPTION("API Driver for PL330 DMAC");
MODULE_LICENSE("GPL");
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