ARM: 6132/1: PL330: Add common core driver

PL330 is a configurable DMA controller PrimeCell device.
The register map of the device is well defined.
The configuration of a particular implementation can be
read from the six configuration registers CR0-4,Dn.

This patch implements a driver for the specification:-
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0424a/DDI0424A_dmac_pl330_r0p0_trm.pdf

The exported interface should be sufficient to implement
a driver for any DMA API.

Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 2187 insertions, 0 deletions

diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index b64bb78d784c..cf9059091884 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -18,6 +18,9 @@ config ICST525
 config ICST307
         bool
 
+config PL330
+        bool
+
 config SA1111
         bool
         select DMABOUNCE if !ARCH_PXA
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index 76be7ff2a7ca..df20c2650206 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_ARM_GIC)		+= gic.o
 obj-$(CONFIG_ARM_VIC)           += vic.o
 obj-$(CONFIG_ICST525)           += icst525.o
 obj-$(CONFIG_ICST307)           += icst307.o
+obj-$(CONFIG_PL330)             += pl330.o
 obj-$(CONFIG_SA1111)            += sa1111.o
 obj-$(CONFIG_PCI_HOST_VIA82C505) += via82c505.o
 obj-$(CONFIG_DMABOUNCE)         += dmabounce.o
diff --git a/arch/arm/common/pl330.c b/arch/arm/common/pl330.c
new file mode 100644
index 000000000000..5ebbab6242a7
--- /dev/null
+++ b/arch/arm/common/pl330.c
@@ -0,0 +1,1966 @@
+/* linux/arch/arm/common/pl330.c
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/hardware/pl330.h>
+
+/* 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 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) \
+                          | (REVISION << 20) | (INTEG_CFG << 24))
+
+#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
+
+/*
+ * 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.
+ */
+#define MARK_FREE(req)  do { \
+                                _emit_END(0, (req)->mc_cpu); \
+                                (req)->mc_len = 0; \
+                        } while (0)
+
+/* 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
+
+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;
+        /* Hook to attach to DMAC's list of reqs with due callback */
+        struct list_head rqd;
+};
+
+/* 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 submitted request */
+        unsigned lstenq;
+};
+
+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;
+};
+
+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 _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);
+}
+
+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;
+        }
+}
+
+/* If the request 'req' of thread 'thrd' is currently active */
+static inline bool _req_active(struct pl330_thread *thrd,
+                struct _pl330_req *req)
+{
+        void __iomem *regs = thrd->dmac->pinfo->base;
+        u32 buf = req->mc_bus, pc = readl(regs + CPC(thrd->id));
+
+        if (IS_FREE(req))
+                return false;
+
+        return (pc >= buf && pc <= buf + req->mc_len) ? true : false;
+}
+
+/* Returns 0 if the thread is inactive, ID of active req + 1 otherwise */
+static inline unsigned _thrd_active(struct pl330_thread *thrd)
+{
+        if (_req_active(thrd, &thrd->req[0]))
+                return 1; /* First req active */
+
+        if (_req_active(thrd, &thrd->req[1]))
+                return 2; /* Second req active */
+
+        return 0;
+}
+
+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};
+
+        /* Return if already ACTIVE */
+        if (_state(thrd) != PL330_STATE_STOPPED)
+                return true;
+
+        if (!IS_FREE(&thrd->req[1 - thrd->lstenq]))
+                req = &thrd->req[1 - thrd->lstenq];
+        else if (!IS_FREE(&thrd->req[thrd->lstenq]))
+                req = &thrd->req[thrd->lstenq];
+        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);
+
+        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;
+
+        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 possibile 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->dcctl << CC_SRCCCTRL_SHFT);
+        ccr |= (rqc->scctl << 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.
+ */
+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;
+        }
+
+        /* Prefer Secure Channel */
+        if (!_manager_ns(thrd))
+                r->cfg->nonsecure = 0;
+        else
+                r->cfg->nonsecure = 1;
+
+        /* Use last settings, if not provided */
+        if (r->cfg)
+                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;
+}
+EXPORT_SYMBOL(pl330_submit_req);
+
+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->req[0]);
+                        MARK_FREE(&thrd->req[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 */
+int pl330_update(const struct pl330_info *pi)
+{
+        struct _pl330_req *rqdone;
+        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 occured */
+                        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_active(thrd);
+                        if (!active) /* Aborted */
+                                continue;
+
+                        active -= 1;
+
+                        rqdone = &thrd->req[active];
+                        MARK_FREE(rqdone);
+
+                        /* 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 */
+        while (!list_empty(&pl330->req_done)) {
+                rqdone = container_of(pl330->req_done.next,
+                                        struct _pl330_req, rqd);
+
+                list_del_init(&rqdone->rqd);
+
+                spin_unlock_irqrestore(&pl330->lock, flags);
+                _callback(rqdone->r, 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;
+}
+EXPORT_SYMBOL(pl330_update);
+
+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;
+
+        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->req[0]);
+                MARK_FREE(&thrd->req[1]);
+                break;
+
+        case PL330_OP_ABORT:
+                active = _thrd_active(thrd);
+
+                /* Make sure the channel is stopped */
+                _stop(thrd);
+
+                /* ABORT is only for the active req */
+                if (!active)
+                        break;
+
+                active--;
+
+                thrd->req[active].r = NULL;
+                MARK_FREE(&thrd->req[active]);
+
+                /* Start the next */
+        case PL330_OP_START:
+                if (!_start(thrd))
+                        ret = -EIO;
+                break;
+
+        default:
+                ret = -EINVAL;
+        }
+
+        spin_unlock_irqrestore(&pl330->lock, flags);
+        return ret;
+}
+EXPORT_SYMBOL(pl330_chan_ctrl);
+
+int pl330_chan_status(void *ch_id, struct pl330_chanstatus *pstatus)
+{
+        struct pl330_thread *thrd = ch_id;
+        struct pl330_dmac *pl330;
+        struct pl330_info *pi;
+        void __iomem *regs;
+        int active;
+        u32 val;
+
+        if (!pstatus || !thrd || thrd->free)
+                return -EINVAL;
+
+        pl330 = thrd->dmac;
+        pi = pl330->pinfo;
+        regs = pi->base;
+
+        /* The client should remove the DMAC and add again */
+        if (pl330->state == DYING)
+                pstatus->dmac_halted = true;
+        else
+                pstatus->dmac_halted = false;
+
+        val = readl(regs + FSC);
+        if (val & (1 << thrd->id))
+                pstatus->faulting = true;
+        else
+                pstatus->faulting = false;
+
+        active = _thrd_active(thrd);
+
+        if (!active) {
+                /* Indicate that the thread is not running */
+                pstatus->top_req = NULL;
+                pstatus->wait_req = NULL;
+        } else {
+                active--;
+                pstatus->top_req = thrd->req[active].r;
+                pstatus->wait_req = !IS_FREE(&thrd->req[1 - active])
+                                        ? thrd->req[1 - active].r : NULL;
+        }
+
+        pstatus->src_addr = readl(regs + SA(thrd->id));
+        pstatus->dst_addr = readl(regs + DA(thrd->id));
+
+        return 0;
+}
+EXPORT_SYMBOL(pl330_chan_status);
+
+/* 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;
+}
+
+/* Upon success, returns IdentityToken for the
+ * allocated channel, NULL otherwise.
+ */
+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) {
+                        thrd->ev = _alloc_event(thrd);
+                        if (thrd->ev >= 0) {
+                                thrd->free = false;
+                                thrd->lstenq = 1;
+                                thrd->req[0].r = NULL;
+                                MARK_FREE(&thrd->req[0]);
+                                thrd->req[1].r = NULL;
+                                MARK_FREE(&thrd->req[1]);
+                                break;
+                        }
+                }
+                thrd = NULL;
+        }
+
+        spin_unlock_irqrestore(&pl330->lock, flags);
+
+        return thrd;
+}
+EXPORT_SYMBOL(pl330_request_channel);
+
+/* 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;
+}
+
+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);
+}
+EXPORT_SYMBOL(pl330_release_channel);
+
+/* 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->req[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->req[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;
+}
+
+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) != PERIPH_ID_VAL
+           || get_id(pi, PCELL_ID) != PCELL_ID_VAL) {
+                dev_err(pi->dev, "PERIPH_ID 0x%x, PCELL_ID 0x%x !\n",
+                        readl(regs + PERIPH_ID), readl(regs + 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;
+}
+EXPORT_SYMBOL(pl330_add);
+
+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);
+}
+
+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;
+}
+EXPORT_SYMBOL(pl330_del);
diff --git a/arch/arm/include/asm/hardware/pl330.h b/arch/arm/include/asm/hardware/pl330.h
new file mode 100644
index 000000000000..575fa8186ca0
--- /dev/null
+++ b/arch/arm/include/asm/hardware/pl330.h
@@ -0,0 +1,217 @@
+/* linux/include/asm/hardware/pl330.h
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __PL330_CORE_H
+#define __PL330_CORE_H
+
+#define PL330_MAX_CHAN          8
+#define PL330_MAX_IRQS          32
+#define PL330_MAX_PERI          32
+
+enum pl330_srccachectrl {
+        SCCTRL0 = 0, /* 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 = 0, /* Noncacheable and nonbufferable */
+        DCCTRL1, /* Bufferable only */
+        DCCTRL2, /* Cacheable, but do not allocate */
+        DCCTRL3, /* Cacheable and bufferable, but do not allocate */
+        DINVALID1 = 8,
+        DINVALID2,
+        DCCTRL6, /* Cacheable write-through, allocate on writes only */
+        DCCTRL7, /* Cacheable write-back, allocate on writes only */
+};
+
+/* 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);
+};
+
+enum pl330_byteswap {
+        SWAP_NO = 0,
+        SWAP_2,
+        SWAP_4,
+        SWAP_8,
+        SWAP_16,
+};
+
+/**
+ * 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;
+};
+
+/*
+ * 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,
+};
+
+enum pl330_reqtype {
+        MEMTOMEM,
+        MEMTODEV,
+        DEVTOMEM,
+        DEVTODEV,
+};
+
+/* 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;
+};
+
+/*
+ * 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,
+};
+
+extern int pl330_add(struct pl330_info *);
+extern void pl330_del(struct pl330_info *pi);
+extern int pl330_update(const struct pl330_info *pi);
+extern void pl330_release_channel(void *ch_id);
+extern void *pl330_request_channel(const struct pl330_info *pi);
+extern int pl330_chan_status(void *ch_id, struct pl330_chanstatus *pstatus);
+extern int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op);
+extern int pl330_submit_req(void *ch_id, struct pl330_req *r);
+
+#endif  /* __PL330_CORE_H */