--- /dev/null
+/* 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);
--- /dev/null
+/* linux/arch/arm/plat-samsung/rk29-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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+
+#include <asm/hardware/pl330.h>
+
+#include <mach/rk29-dma-pl330.h>
+
+/**
+ * struct rk29_pl330_dmac - Logical representation of a PL330 DMAC.
+ * @busy_chan: Number of channels currently busy.
+ * @peri: List of IDs of peripherals this DMAC can work with.
+ * @node: To attach to the global list of DMACs.
+ * @pi: PL330 configuration info for the DMAC.
+ * @kmcache: Pool to quickly allocate xfers for all channels in the dmac.
+ */
+struct rk29_pl330_dmac {
+ unsigned busy_chan;
+ enum dma_ch *peri;
+ struct list_head node;
+ struct pl330_info *pi;
+ struct kmem_cache *kmcache;
+};
+
+/**
+ * struct rk29_pl330_xfer - A request submitted by rk29 DMA clients.
+ * @token: Xfer ID provided by the client.
+ * @node: To attach to the list of xfers on a channel.
+ * @px: Xfer for PL330 core.
+ * @chan: Owner channel of this xfer.
+ */
+struct rk29_pl330_xfer {
+ void *token;
+ struct list_head node;
+ struct pl330_xfer px;
+ struct rk29_pl330_chan *chan;
+};
+
+/**
+ * struct rk29_pl330_chan - Logical channel to communicate with
+ * a Physical peripheral.
+ * @pl330_chan_id: Token of a hardware channel thread of PL330 DMAC.
+ * NULL if the channel is available to be acquired.
+ * @id: ID of the peripheral that this channel can communicate with.
+ * @options: Options specified by the client.
+ * @sdaddr: Address provided via rk29_dma_devconfig.
+ * @node: To attach to the global list of channels.
+ * @lrq: Pointer to the last submitted pl330_req to PL330 core.
+ * @xfer_list: To manage list of xfers enqueued.
+ * @req: Two requests to communicate with the PL330 engine.
+ * @callback_fn: Callback function to the client.
+ * @rqcfg: Channel configuration for the xfers.
+ * @xfer_head: Pointer to the xfer to be next excecuted.
+ * @dmac: Pointer to the DMAC that manages this channel, NULL if the
+ * channel is available to be acquired.
+ * @client: Client of this channel. NULL if the
+ * channel is available to be acquired.
+ */
+struct rk29_pl330_chan {
+ void *pl330_chan_id;
+ enum dma_ch id;
+ unsigned int options;
+ unsigned long sdaddr;
+ struct list_head node;
+ struct pl330_req *lrq;
+ struct list_head xfer_list;
+ struct pl330_req req[2];
+ rk29_dma_cbfn_t callback_fn;
+ struct pl330_reqcfg rqcfg;
+ struct rk29_pl330_xfer *xfer_head;
+ struct rk29_pl330_dmac *dmac;
+ struct rk29_dma_client *client;
+};
+
+/* All DMACs in the platform */
+static LIST_HEAD(dmac_list);
+
+/* All channels to peripherals in the platform */
+static LIST_HEAD(chan_list);
+
+/*
+ * Since we add resources(DMACs and Channels) to the global pool,
+ * we need to guard access to the resources using a global lock
+ */
+static DEFINE_SPINLOCK(res_lock);
+
+/* Returns the channel with ID 'id' in the chan_list */
+static struct rk29_pl330_chan *id_to_chan(const enum dma_ch id)
+{
+ struct rk29_pl330_chan *ch;
+
+ list_for_each_entry(ch, &chan_list, node)
+ if (ch->id == id)
+ return ch;
+
+ return NULL;
+}
+
+/* Allocate a new channel with ID 'id' and add to chan_list */
+static void chan_add(const enum dma_ch id)
+{
+ struct rk29_pl330_chan *ch = id_to_chan(id);
+
+ /* Return if the channel already exists */
+ if (ch)
+ return;
+
+ ch = kmalloc(sizeof(*ch), GFP_KERNEL);
+ /* Return silently to work with other channels */
+ if (!ch)
+ return;
+
+ ch->id = id;
+ ch->dmac = NULL;
+
+ list_add_tail(&ch->node, &chan_list);
+}
+
+/* If the channel is not yet acquired by any client */
+static bool chan_free(struct rk29_pl330_chan *ch)
+{
+ if (!ch)
+ return false;
+
+ /* Channel points to some DMAC only when it's acquired */
+ return ch->dmac ? false : true;
+}
+
+/*
+ * Returns 0 is peripheral i/f is invalid or not present on the dmac.
+ * Index + 1, otherwise.
+ */
+static unsigned iface_of_dmac(struct rk29_pl330_dmac *dmac, enum dma_ch ch_id)
+{
+ enum dma_ch *id = dmac->peri;
+ int i;
+
+ /* Discount invalid markers */
+ if (ch_id == DMACH_MAX)
+ return 0;
+
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (id[i] == ch_id)
+ return i + 1;
+
+ return 0;
+}
+
+/* If all channel threads of the DMAC are busy */
+static inline bool dmac_busy(struct rk29_pl330_dmac *dmac)
+{
+ struct pl330_info *pi = dmac->pi;
+
+ return (dmac->busy_chan < pi->pcfg.num_chan) ? false : true;
+}
+
+/*
+ * Returns the number of free channels that
+ * can be handled by this dmac only.
+ */
+static unsigned ch_onlyby_dmac(struct rk29_pl330_dmac *dmac)
+{
+ enum dma_ch *id = dmac->peri;
+ struct rk29_pl330_dmac *d;
+ struct rk29_pl330_chan *ch;
+ unsigned found, count = 0;
+ enum dma_ch p;
+ int i;
+
+ for (i = 0; i < PL330_MAX_PERI; i++) {
+ p = id[i];
+ ch = id_to_chan(p);
+
+ if (p == DMACH_MAX || !chan_free(ch))
+ continue;
+
+ found = 0;
+ list_for_each_entry(d, &dmac_list, node) {
+ if (d != dmac && iface_of_dmac(d, ch->id)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ count++;
+ }
+
+ return count;
+}
+
+/*
+ * Measure of suitability of 'dmac' handling 'ch'
+ *
+ * 0 indicates 'dmac' can not handle 'ch' either
+ * because it is not supported by the hardware or
+ * because all dmac channels are currently busy.
+ *
+ * >0 vlaue indicates 'dmac' has the capability.
+ * The bigger the value the more suitable the dmac.
+ */
+#define MAX_SUIT UINT_MAX
+#define MIN_SUIT 0
+
+static unsigned suitablility(struct rk29_pl330_dmac *dmac,
+ struct rk29_pl330_chan *ch)
+{
+ struct pl330_info *pi = dmac->pi;
+ enum dma_ch *id = dmac->peri;
+ struct rk29_pl330_dmac *d;
+ unsigned s;
+ int i;
+
+ s = MIN_SUIT;
+ /* If all the DMAC channel threads are busy */
+ if (dmac_busy(dmac))
+ return s;
+
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (id[i] == ch->id)
+ break;
+
+ /* If the 'dmac' can't talk to 'ch' */
+ if (i == PL330_MAX_PERI)
+ return s;
+
+ s = MAX_SUIT;
+ list_for_each_entry(d, &dmac_list, node) {
+ /*
+ * If some other dmac can talk to this
+ * peri and has some channel free.
+ */
+ if (d != dmac && iface_of_dmac(d, ch->id) && !dmac_busy(d)) {
+ s = 0;
+ break;
+ }
+ }
+ if (s)
+ return s;
+
+ s = 100;
+
+ /* Good if free chans are more, bad otherwise */
+ s += (pi->pcfg.num_chan - dmac->busy_chan) - ch_onlyby_dmac(dmac);
+
+ return s;
+}
+
+/* More than one DMAC may have capability to transfer data with the
+ * peripheral. This function assigns most suitable DMAC to manage the
+ * channel and hence communicate with the peripheral.
+ */
+static struct rk29_pl330_dmac *map_chan_to_dmac(struct rk29_pl330_chan *ch)
+{
+ struct rk29_pl330_dmac *d, *dmac = NULL;
+ unsigned sn, sl = MIN_SUIT;
+
+ list_for_each_entry(d, &dmac_list, node) {
+ sn = suitablility(d, ch);
+
+ if (sn == MAX_SUIT)
+ return d;
+
+ if (sn > sl)
+ dmac = d;
+ }
+
+ return dmac;
+}
+
+/* Acquire the channel for peripheral 'id' */
+static struct rk29_pl330_chan *chan_acquire(const enum dma_ch id)
+{
+ struct rk29_pl330_chan *ch = id_to_chan(id);
+ struct rk29_pl330_dmac *dmac;
+
+ /* If the channel doesn't exist or is already acquired */
+ if (!ch || !chan_free(ch)) {
+ ch = NULL;
+ goto acq_exit;
+ }
+
+ dmac = map_chan_to_dmac(ch);
+ /* If couldn't map */
+ if (!dmac) {
+ ch = NULL;
+ goto acq_exit;
+ }
+
+ dmac->busy_chan++;
+ ch->dmac = dmac;
+
+acq_exit:
+ return ch;
+}
+
+/* Delete xfer from the queue */
+static inline void del_from_queue(struct rk29_pl330_xfer *xfer)
+{
+ struct rk29_pl330_xfer *t;
+ struct rk29_pl330_chan *ch;
+ int found;
+
+ if (!xfer)
+ return;
+
+ ch = xfer->chan;
+
+ /* Make sure xfer is in the queue */
+ found = 0;
+ list_for_each_entry(t, &ch->xfer_list, node)
+ if (t == xfer) {
+ found = 1;
+ break;
+ }
+
+ if (!found)
+ return;
+
+ /* If xfer is last entry in the queue */
+ if (xfer->node.next == &ch->xfer_list)
+ t = list_entry(ch->xfer_list.next,
+ struct rk29_pl330_xfer, node);
+ else
+ t = list_entry(xfer->node.next,
+ struct rk29_pl330_xfer, node);
+
+ /* If there was only one node left */
+ if (t == xfer)
+ ch->xfer_head = NULL;
+ else if (ch->xfer_head == xfer)
+ ch->xfer_head = t;
+
+ list_del(&xfer->node);
+}
+
+/* Provides pointer to the next xfer in the queue.
+ * If CIRCULAR option is set, the list is left intact,
+ * otherwise the xfer is removed from the list.
+ * Forced delete 'pluck' can be set to override the CIRCULAR option.
+ */
+static struct rk29_pl330_xfer *get_from_queue(struct rk29_pl330_chan *ch,
+ int pluck)
+{
+ struct rk29_pl330_xfer *xfer = ch->xfer_head;
+
+ if (!xfer)
+ return NULL;
+
+ /* If xfer is last entry in the queue */
+ if (xfer->node.next == &ch->xfer_list)
+ ch->xfer_head = list_entry(ch->xfer_list.next,
+ struct rk29_pl330_xfer, node);
+ else
+ ch->xfer_head = list_entry(xfer->node.next,
+ struct rk29_pl330_xfer, node);
+
+ if (pluck || !(ch->options & RK29_DMAF_CIRCULAR))
+ del_from_queue(xfer);
+
+ return xfer;
+}
+
+static inline void add_to_queue(struct rk29_pl330_chan *ch,
+ struct rk29_pl330_xfer *xfer, int front)
+{
+ struct pl330_xfer *xt;
+
+ /* If queue empty */
+ if (ch->xfer_head == NULL)
+ ch->xfer_head = xfer;
+
+ xt = &ch->xfer_head->px;
+ /* If the head already submitted (CIRCULAR head) */
+ if (ch->options & RK29_DMAF_CIRCULAR &&
+ (xt == ch->req[0].x || xt == ch->req[1].x))
+ ch->xfer_head = xfer;
+
+ /* If this is a resubmission, it should go at the head */
+ if (front) {
+ ch->xfer_head = xfer;
+ list_add(&xfer->node, &ch->xfer_list);
+ } else {
+ list_add_tail(&xfer->node, &ch->xfer_list);
+ }
+}
+
+static inline void _finish_off(struct rk29_pl330_xfer *xfer,
+ enum rk29_dma_buffresult res, int ffree)
+{
+ struct rk29_pl330_chan *ch;
+
+ if (!xfer)
+ return;
+
+ ch = xfer->chan;
+
+ /* Do callback */
+ if (ch->callback_fn)
+ ch->callback_fn(NULL, xfer->token, xfer->px.bytes, res);
+
+ /* Force Free or if buffer is not needed anymore */
+ if (ffree || !(ch->options & RK29_DMAF_CIRCULAR))
+ kmem_cache_free(ch->dmac->kmcache, xfer);
+}
+
+static inline int rk29_pl330_submit(struct rk29_pl330_chan *ch,
+ struct pl330_req *r)
+{
+ struct rk29_pl330_xfer *xfer;
+ int ret = 0;
+
+ /* If already submitted */
+ if (r->x)
+ return 0;
+
+ xfer = get_from_queue(ch, 0);
+ if (xfer) {
+ r->x = &xfer->px;
+
+ /* Use max bandwidth for M<->M xfers */
+ if (r->rqtype == MEMTOMEM) {
+ struct pl330_info *pi = xfer->chan->dmac->pi;
+ int burst = 1 << ch->rqcfg.brst_size;
+ u32 bytes = r->x->bytes;
+ int bl;
+
+ bl = pi->pcfg.data_bus_width / 8;
+ bl *= pi->pcfg.data_buf_dep;
+ bl /= burst;
+
+ /* src/dst_burst_len can't be more than 16 */
+ if (bl > 16)
+ bl = 16;
+
+ while (bl > 1) {
+ if (!(bytes % (bl * burst)))
+ break;
+ bl--;
+ }
+
+ ch->rqcfg.brst_len = bl;
+ } else {
+ ch->rqcfg.brst_len = 1;
+ }
+
+ ret = pl330_submit_req(ch->pl330_chan_id, r);
+
+ /* If submission was successful */
+ if (!ret) {
+ ch->lrq = r; /* latest submitted req */
+ return 0;
+ }
+
+ r->x = NULL;
+
+ /* If both of the PL330 ping-pong buffers filled */
+ if (ret == -EAGAIN) {
+ dev_err(ch->dmac->pi->dev, "%s:%d!\n",
+ __func__, __LINE__);
+ /* Queue back again */
+ add_to_queue(ch, xfer, 1);
+ ret = 0;
+ } else {
+ dev_err(ch->dmac->pi->dev, "%s:%d!\n",
+ __func__, __LINE__);
+ _finish_off(xfer, RK29_RES_ERR, 0);
+ }
+ }
+
+ return ret;
+}
+
+static void rk29_pl330_rq(struct rk29_pl330_chan *ch,
+ struct pl330_req *r, enum pl330_op_err err)
+{
+ unsigned long flags;
+ struct rk29_pl330_xfer *xfer;
+ struct pl330_xfer *xl = r->x;
+ enum rk29_dma_buffresult res;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ r->x = NULL;
+
+ rk29_pl330_submit(ch, r);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ /* Map result to rk29 DMA API */
+ if (err == PL330_ERR_NONE)
+ res = RK29_RES_OK;
+ else if (err == PL330_ERR_ABORT)
+ res = RK29_RES_ABORT;
+ else
+ res = RK29_RES_ERR;
+
+ /* If last request had some xfer */
+ if (xl) {
+ xfer = container_of(xl, struct rk29_pl330_xfer, px);
+ _finish_off(xfer, res, 0);
+ } else {
+ dev_info(ch->dmac->pi->dev, "%s:%d No Xfer?!\n",
+ __func__, __LINE__);
+ }
+}
+
+static void rk29_pl330_rq0(void *token, enum pl330_op_err err)
+{
+ struct pl330_req *r = token;
+ struct rk29_pl330_chan *ch = container_of(r,
+ struct rk29_pl330_chan, req[0]);
+ rk29_pl330_rq(ch, r, err);
+}
+
+static void rk29_pl330_rq1(void *token, enum pl330_op_err err)
+{
+ struct pl330_req *r = token;
+ struct rk29_pl330_chan *ch = container_of(r,
+ struct rk29_pl330_chan, req[1]);
+ rk29_pl330_rq(ch, r, err);
+}
+
+/* Release an acquired channel */
+static void chan_release(struct rk29_pl330_chan *ch)
+{
+ struct rk29_pl330_dmac *dmac;
+
+ if (chan_free(ch))
+ return;
+
+ dmac = ch->dmac;
+ ch->dmac = NULL;
+ dmac->busy_chan--;
+}
+
+int rk29_dma_ctrl(enum dma_ch id, enum rk29_chan_op op)
+{
+ struct rk29_pl330_xfer *xfer;
+ enum pl330_chan_op pl330op;
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int idx, ret;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto ctrl_exit;
+ }
+
+ switch (op) {
+ case RK29_DMAOP_START:
+ /* Make sure both reqs are enqueued */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+ rk29_pl330_submit(ch, &ch->req[idx]);
+ rk29_pl330_submit(ch, &ch->req[1 - idx]);
+ pl330op = PL330_OP_START;
+ break;
+
+ case RK29_DMAOP_STOP:
+ pl330op = PL330_OP_ABORT;
+ break;
+
+ case RK29_DMAOP_FLUSH:
+ pl330op = PL330_OP_FLUSH;
+ break;
+
+ case RK29_DMAOP_PAUSE:
+ case RK29_DMAOP_RESUME:
+ case RK29_DMAOP_TIMEOUT:
+ case RK29_DMAOP_STARTED:
+ spin_unlock_irqrestore(&res_lock, flags);
+ return 0;
+
+ default:
+ spin_unlock_irqrestore(&res_lock, flags);
+ return -EINVAL;
+ }
+
+ ret = pl330_chan_ctrl(ch->pl330_chan_id, pl330op);
+
+ if (pl330op == PL330_OP_START) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ return ret;
+ }
+
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ /* Abort the current xfer */
+ if (ch->req[idx].x) {
+ xfer = container_of(ch->req[idx].x,
+ struct rk29_pl330_xfer, px);
+
+ /* Drop xfer during FLUSH */
+ if (pl330op == PL330_OP_FLUSH)
+ del_from_queue(xfer);
+
+ ch->req[idx].x = NULL;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT,
+ pl330op == PL330_OP_FLUSH ? 1 : 0);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Flush the whole queue */
+ if (pl330op == PL330_OP_FLUSH) {
+
+ if (ch->req[1 - idx].x) {
+ xfer = container_of(ch->req[1 - idx].x,
+ struct rk29_pl330_xfer, px);
+
+ del_from_queue(xfer);
+
+ ch->req[1 - idx].x = NULL;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Finish off the remaining in the queue */
+ xfer = ch->xfer_head;
+ while (xfer) {
+
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+
+ xfer = ch->xfer_head;
+ }
+ }
+
+ctrl_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_ctrl);
+
+int rk29_dma_enqueue(enum dma_ch id, void *token,
+ dma_addr_t addr, int size)
+{
+ struct rk29_pl330_chan *ch;
+ struct rk29_pl330_xfer *xfer;
+ unsigned long flags;
+ int idx, ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ /* Error if invalid or free channel */
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto enq_exit;
+ }
+
+ /* Error if size is unaligned */
+ if (ch->rqcfg.brst_size && size % (1 << ch->rqcfg.brst_size)) {
+ ret = -EINVAL;
+ goto enq_exit;
+ }
+
+ xfer = kmem_cache_alloc(ch->dmac->kmcache, GFP_ATOMIC);
+ if (!xfer) {
+ ret = -ENOMEM;
+ goto enq_exit;
+ }
+
+ xfer->token = token;
+ xfer->chan = ch;
+ xfer->px.bytes = size;
+ xfer->px.next = NULL; /* Single request */
+
+ /* For rk29 DMA API, direction is always fixed for all xfers */
+ if (ch->req[0].rqtype == MEMTODEV) {
+ xfer->px.src_addr = addr;
+ xfer->px.dst_addr = ch->sdaddr;
+ } else {
+ xfer->px.src_addr = ch->sdaddr;
+ xfer->px.dst_addr = addr;
+ }
+
+ add_to_queue(ch, xfer, 0);
+
+ /* Try submitting on either request */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ if (!ch->req[idx].x)
+ rk29_pl330_submit(ch, &ch->req[idx]);
+ else
+ rk29_pl330_submit(ch, &ch->req[1 - idx]);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ if (ch->options & RK29_DMAF_AUTOSTART)
+ rk29_dma_ctrl(id, RK29_DMAOP_START);
+
+ return 0;
+
+enq_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_enqueue);
+
+int rk29_dma_request(enum dma_ch id,
+ struct rk29_dma_client *client,
+ void *dev)
+{
+ struct rk29_pl330_dmac *dmac;
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = chan_acquire(id);
+ if (!ch) {
+ ret = -EBUSY;
+ goto req_exit;
+ }
+
+ dmac = ch->dmac;
+
+ ch->pl330_chan_id = pl330_request_channel(dmac->pi);
+ if (!ch->pl330_chan_id) {
+ chan_release(ch);
+ ret = -EBUSY;
+ goto req_exit;
+ }
+
+ ch->client = client;
+ ch->options = 0; /* Clear any option */
+ ch->callback_fn = NULL; /* Clear any callback */
+ ch->lrq = NULL;
+
+ ch->rqcfg.brst_size = 2; /* Default word size */
+ ch->rqcfg.swap = SWAP_NO;
+ ch->rqcfg.scctl = SCCTRL0; /* Noncacheable and nonbufferable */
+ ch->rqcfg.dcctl = DCCTRL0; /* Noncacheable and nonbufferable */
+ ch->rqcfg.privileged = 0;
+ ch->rqcfg.insnaccess = 0;
+
+ /* Set invalid direction */
+ ch->req[0].rqtype = DEVTODEV;
+ ch->req[1].rqtype = ch->req[0].rqtype;
+
+ ch->req[0].cfg = &ch->rqcfg;
+ ch->req[1].cfg = ch->req[0].cfg;
+
+ ch->req[0].peri = iface_of_dmac(dmac, id) - 1; /* Original index */
+ ch->req[1].peri = ch->req[0].peri;
+
+ ch->req[0].token = &ch->req[0];
+ ch->req[0].xfer_cb = rk29_pl330_rq0;
+ ch->req[1].token = &ch->req[1];
+ ch->req[1].xfer_cb = rk29_pl330_rq1;
+
+ ch->req[0].x = NULL;
+ ch->req[1].x = NULL;
+
+ /* Reset xfer list */
+ INIT_LIST_HEAD(&ch->xfer_list);
+ ch->xfer_head = NULL;
+
+req_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_request);
+
+int rk29_dma_free(enum dma_ch id, struct rk29_dma_client *client)
+{
+ struct rk29_pl330_chan *ch;
+ struct rk29_pl330_xfer *xfer;
+ unsigned long flags;
+ int ret = 0;
+ unsigned idx;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch))
+ goto free_exit;
+
+ /* Refuse if someone else wanted to free the channel */
+ if (ch->client != client) {
+ ret = -EBUSY;
+ goto free_exit;
+ }
+
+ /* Stop any active xfer, Flushe the queue and do callbacks */
+ pl330_chan_ctrl(ch->pl330_chan_id, PL330_OP_FLUSH);
+
+ /* Abort the submitted requests */
+ idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
+
+ if (ch->req[idx].x) {
+ xfer = container_of(ch->req[idx].x,
+ struct rk29_pl330_xfer, px);
+
+ ch->req[idx].x = NULL;
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ if (ch->req[1 - idx].x) {
+ xfer = container_of(ch->req[1 - idx].x,
+ struct rk29_pl330_xfer, px);
+
+ ch->req[1 - idx].x = NULL;
+ del_from_queue(xfer);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ }
+
+ /* Pluck and Abort the queued requests in order */
+ do {
+ xfer = get_from_queue(ch, 1);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+ _finish_off(xfer, RK29_RES_ABORT, 1);
+ spin_lock_irqsave(&res_lock, flags);
+ } while (xfer);
+
+ ch->client = NULL;
+
+ pl330_release_channel(ch->pl330_chan_id);
+
+ ch->pl330_chan_id = NULL;
+
+ chan_release(ch);
+
+free_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_free);
+
+int rk29_dma_config(enum dma_ch id, int xferunit)
+{
+ struct rk29_pl330_chan *ch;
+ struct pl330_info *pi;
+ unsigned long flags;
+ int i, dbwidth, ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto cfg_exit;
+ }
+
+ pi = ch->dmac->pi;
+ dbwidth = pi->pcfg.data_bus_width / 8;
+
+ /* Max size of xfer can be pcfg.data_bus_width */
+ if (xferunit > dbwidth) {
+ ret = -EINVAL;
+ goto cfg_exit;
+ }
+
+ i = 0;
+ while (xferunit != (1 << i))
+ i++;
+
+ /* If valid value */
+ if (xferunit == (1 << i))
+ ch->rqcfg.brst_size = i;
+ else
+ ret = -EINVAL;
+
+cfg_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_config);
+
+/* Options that are supported by this driver */
+#define RK29_PL330_FLAGS (RK29_DMAF_CIRCULAR | RK29_DMAF_AUTOSTART)
+
+int rk29_dma_setflags(enum dma_ch id, unsigned int options)
+{
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch) || options & ~(RK29_PL330_FLAGS))
+ ret = -EINVAL;
+ else
+ ch->options = options;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(rk29_dma_setflags);
+
+int rk29_dma_set_buffdone_fn(enum dma_ch id, rk29_dma_cbfn_t rtn)
+{
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch))
+ ret = -EINVAL;
+ else
+ ch->callback_fn = rtn;
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_set_buffdone_fn);
+
+int rk29_dma_devconfig(enum dma_ch id, enum rk29_dmasrc source,
+ unsigned long address)
+{
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ ch = id_to_chan(id);
+
+ if (!ch || chan_free(ch)) {
+ ret = -EINVAL;
+ goto devcfg_exit;
+ }
+
+ switch (source) {
+ case RK29_DMASRC_HW: /* P->M */
+ ch->req[0].rqtype = DEVTOMEM;
+ ch->req[1].rqtype = DEVTOMEM;
+ ch->rqcfg.src_inc = 0;
+ ch->rqcfg.dst_inc = 1;
+ break;
+ case RK29_DMASRC_MEM: /* M->P */
+ ch->req[0].rqtype = MEMTODEV;
+ ch->req[1].rqtype = MEMTODEV;
+ ch->rqcfg.src_inc = 1;
+ ch->rqcfg.dst_inc = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto devcfg_exit;
+ }
+
+ ch->sdaddr = address;
+
+devcfg_exit:
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(rk29_dma_devconfig);
+
+int rk29_dma_getposition(enum dma_ch id, dma_addr_t *src, dma_addr_t *dst)
+{
+ struct rk29_pl330_chan *ch = id_to_chan(id);
+ struct pl330_chanstatus status;
+ int ret;
+
+ if (!ch || chan_free(ch))
+ return -EINVAL;
+
+ ret = pl330_chan_status(ch->pl330_chan_id, &status);
+ if (ret < 0)
+ return ret;
+
+ *src = status.src_addr;
+ *dst = status.dst_addr;
+
+ return 0;
+}
+EXPORT_SYMBOL(rk29_dma_getposition);
+
+static irqreturn_t pl330_irq_handler(int irq, void *data)
+{
+ if (pl330_update(data))
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}
+
+static int pl330_probe(struct platform_device *pdev)
+{
+ struct rk29_pl330_dmac *rk29_pl330_dmac;
+ struct rk29_pl330_platdata *pl330pd;
+ struct pl330_info *pl330_info;
+ struct resource *res;
+ int i, ret, irq;
+
+ pl330pd = pdev->dev.platform_data;
+
+ /* Can't do without the list of _32_ peripherals */
+ if (!pl330pd || !pl330pd->peri) {
+ dev_err(&pdev->dev, "platform data missing!\n");
+ return -ENODEV;
+ }
+
+ pl330_info = kzalloc(sizeof(*pl330_info), GFP_KERNEL);
+ if (!pl330_info)
+ return -ENOMEM;
+
+ pl330_info->pl330_data = NULL;
+ pl330_info->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -ENODEV;
+ goto probe_err1;
+ }
+
+ request_mem_region(res->start, resource_size(res), pdev->name);
+
+ pl330_info->base = ioremap(res->start, resource_size(res));
+ if (!pl330_info->base) {
+ ret = -ENXIO;
+ goto probe_err2;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto probe_err3;
+ }
+
+ ret = request_irq(irq, pl330_irq_handler, 0,
+ dev_name(&pdev->dev), pl330_info);
+ if (ret)
+ goto probe_err4;
+
+ ret = pl330_add(pl330_info);
+ if (ret)
+ goto probe_err5;
+
+ /* Allocate a new DMAC */
+ rk29_pl330_dmac = kmalloc(sizeof(*rk29_pl330_dmac), GFP_KERNEL);
+ if (!rk29_pl330_dmac) {
+ ret = -ENOMEM;
+ goto probe_err6;
+ }
+
+ /* Hook the info */
+ rk29_pl330_dmac->pi = pl330_info;
+
+ /* No busy channels */
+ rk29_pl330_dmac->busy_chan = 0;
+
+ rk29_pl330_dmac->kmcache = kmem_cache_create(dev_name(&pdev->dev),
+ sizeof(struct rk29_pl330_xfer), 0, 0, NULL);
+
+ if (!rk29_pl330_dmac->kmcache) {
+ ret = -ENOMEM;
+ goto probe_err7;
+ }
+
+ /* Get the list of peripherals */
+ rk29_pl330_dmac->peri = pl330pd->peri;
+
+ /* Attach to the list of DMACs */
+ list_add_tail(&rk29_pl330_dmac->node, &dmac_list);
+
+ /* Create a channel for each peripheral in the DMAC
+ * that is, if it doesn't already exist
+ */
+ for (i = 0; i < PL330_MAX_PERI; i++)
+ if (rk29_pl330_dmac->peri[i] != DMACH_MAX)
+ chan_add(rk29_pl330_dmac->peri[i]);
+
+ printk(KERN_INFO
+ "Loaded driver for PL330 DMAC-%d %s\n", pdev->id, pdev->name);
+ printk(KERN_INFO
+ "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
+ pl330_info->pcfg.data_buf_dep,
+ pl330_info->pcfg.data_bus_width / 8, pl330_info->pcfg.num_chan,
+ pl330_info->pcfg.num_peri, pl330_info->pcfg.num_events);
+
+ return 0;
+
+probe_err7:
+ kfree(rk29_pl330_dmac);
+probe_err6:
+ pl330_del(pl330_info);
+probe_err5:
+ free_irq(irq, pl330_info);
+probe_err4:
+probe_err3:
+ iounmap(pl330_info->base);
+probe_err2:
+ release_mem_region(res->start, resource_size(res));
+probe_err1:
+ kfree(pl330_info);
+
+ return ret;
+}
+
+static int pl330_remove(struct platform_device *pdev)
+{
+ struct rk29_pl330_dmac *dmac, *d;
+ struct rk29_pl330_chan *ch;
+ unsigned long flags;
+ int del, found;
+
+ if (!pdev->dev.platform_data)
+ return -EINVAL;
+
+ spin_lock_irqsave(&res_lock, flags);
+
+ found = 0;
+ list_for_each_entry(d, &dmac_list, node)
+ if (d->pi->dev == &pdev->dev) {
+ found = 1;
+ break;
+ }
+
+ if (!found) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ return 0;
+ }
+
+ dmac = d;
+
+ /* Remove all Channels that are managed only by this DMAC */
+ list_for_each_entry(ch, &chan_list, node) {
+
+ /* Only channels that are handled by this DMAC */
+ if (iface_of_dmac(dmac, ch->id))
+ del = 1;
+ else
+ continue;
+
+ /* Don't remove if some other DMAC has it too */
+ list_for_each_entry(d, &dmac_list, node)
+ if (d != dmac && iface_of_dmac(d, ch->id)) {
+ del = 0;
+ break;
+ }
+
+ if (del) {
+ spin_unlock_irqrestore(&res_lock, flags);
+ rk29_dma_free(ch->id, ch->client);
+ spin_lock_irqsave(&res_lock, flags);
+ list_del(&ch->node);
+ kfree(ch);
+ }
+ }
+
+ /* Remove the DMAC */
+ list_del(&dmac->node);
+ kfree(dmac);
+
+ spin_unlock_irqrestore(&res_lock, flags);
+
+ return 0;
+}
+
+static struct platform_driver pl330_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "rk29-pl330",
+ },
+ .probe = pl330_probe,
+ .remove = pl330_remove,
+};
+
+static int __init pl330_init(void)
+{
+ return platform_driver_register(&pl330_driver);
+}
+module_init(pl330_init);
+
+static void __exit pl330_exit(void)
+{
+ platform_driver_unregister(&pl330_driver);
+ return;
+}
+module_exit(pl330_exit);
+
+MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
+MODULE_DESCRIPTION("Driver for PL330 DMA Controller");
+MODULE_LICENSE("GPL");
projects / firefly-linux-kernel-4.4.55.git / commitdiff