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-rw-r--r--arch/arm/common/pl330.c1960
1 files changed, 0 insertions, 1960 deletions
diff --git a/arch/arm/common/pl330.c b/arch/arm/common/pl330.c
deleted file mode 100644
index ff3ad22..0000000
--- a/arch/arm/common/pl330.c
+++ /dev/null
@@ -1,1960 +0,0 @@
-/* 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))
-
-#define PCELL_ID_VAL 0xb105f00d
-
-#define PL330_STATE_STOPPED (1 << 0)
-#define PL330_STATE_EXECUTING (1 << 1)
-#define PL330_STATE_WFE (1 << 2)
-#define PL330_STATE_FAULTING (1 << 3)
-#define PL330_STATE_COMPLETING (1 << 4)
-#define PL330_STATE_WFP (1 << 5)
-#define PL330_STATE_KILLING (1 << 6)
-#define PL330_STATE_FAULT_COMPLETING (1 << 7)
-#define PL330_STATE_CACHEMISS (1 << 8)
-#define PL330_STATE_UPDTPC (1 << 9)
-#define PL330_STATE_ATBARRIER (1 << 10)
-#define PL330_STATE_QUEUEBUSY (1 << 11)
-#define PL330_STATE_INVALID (1 << 15)
-
-#define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
- | PL330_STATE_WFE | PL330_STATE_FAULTING)
-
-#define CMD_DMAADDH 0x54
-#define CMD_DMAEND 0x00
-#define CMD_DMAFLUSHP 0x35
-#define CMD_DMAGO 0xa0
-#define CMD_DMALD 0x04
-#define CMD_DMALDP 0x25
-#define CMD_DMALP 0x20
-#define CMD_DMALPEND 0x28
-#define CMD_DMAKILL 0x01
-#define CMD_DMAMOV 0xbc
-#define CMD_DMANOP 0x18
-#define CMD_DMARMB 0x12
-#define CMD_DMASEV 0x34
-#define CMD_DMAST 0x08
-#define CMD_DMASTP 0x29
-#define CMD_DMASTZ 0x0c
-#define CMD_DMAWFE 0x36
-#define CMD_DMAWFP 0x30
-#define CMD_DMAWMB 0x13
-
-#define SZ_DMAADDH 3
-#define SZ_DMAEND 1
-#define SZ_DMAFLUSHP 2
-#define SZ_DMALD 1
-#define SZ_DMALDP 2
-#define SZ_DMALP 2
-#define SZ_DMALPEND 2
-#define SZ_DMAKILL 1
-#define SZ_DMAMOV 6
-#define SZ_DMANOP 1
-#define SZ_DMARMB 1
-#define SZ_DMASEV 2
-#define SZ_DMAST 1
-#define SZ_DMASTP 2
-#define SZ_DMASTZ 1
-#define SZ_DMAWFE 2
-#define SZ_DMAWFP 2
-#define SZ_DMAWMB 1
-#define SZ_DMAGO 6
-
-#define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
-#define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
-
-#define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
-#define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
-
-/*
- * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
- * at 1byte/burst for P<->M and M<->M respectively.
- * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
- * should be enough for P<->M and M<->M respectively.
- */
-#define MCODE_BUFF_PER_REQ 256
-
-/* If the _pl330_req is available to the client */
-#define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND)
-
-/* Use this _only_ to wait on transient states */
-#define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
-
-#ifdef PL330_DEBUG_MCGEN
-static unsigned cmd_line;
-#define PL330_DBGCMD_DUMP(off, x...) do { \
- printk("%x:", cmd_line); \
- printk(x); \
- cmd_line += off; \
- } while (0)
-#define PL330_DBGMC_START(addr) (cmd_line = addr)
-#else
-#define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
-#define PL330_DBGMC_START(addr) do {} while (0)
-#endif
-
-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 enqueued request */
- unsigned lstenq;
- /* Index of the last submitted request or -1 if the DMA is stopped */
- int req_running;
-};
-
-enum pl330_dmac_state {
- UNINIT,
- INIT,
- DYING,
-};
-
-/* A DMAC */
-struct pl330_dmac {
- spinlock_t lock;
- /* Holds list of reqs with due callbacks */
- struct list_head req_done;
- /* Pointer to platform specific stuff */
- struct pl330_info *pinfo;
- /* Maximum possible events/irqs */
- int events[32];
- /* BUS address of MicroCode buffer */
- u32 mcode_bus;
- /* CPU address of MicroCode buffer */
- void *mcode_cpu;
- /* List of all Channel threads */
- struct pl330_thread *channels;
- /* Pointer to the MANAGER thread */
- struct pl330_thread *manager;
- /* To handle bad news in interrupt */
- struct tasklet_struct tasks;
- struct _pl330_tbd dmac_tbd;
- /* State of DMAC operation */
- enum pl330_dmac_state state;
-};
-
-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);
-}
-
-/*
- * Mark a _pl330_req as free.
- * We do it by writing DMAEND as the first instruction
- * because no valid request is going to have DMAEND as
- * its first instruction to execute.
- */
-static void mark_free(struct pl330_thread *thrd, int idx)
-{
- struct _pl330_req *req = &thrd->req[idx];
-
- _emit_END(0, req->mc_cpu);
- req->mc_len = 0;
-
- thrd->req_running = -1;
-}
-
-static inline u32 _state(struct pl330_thread *thrd)
-{
- void __iomem *regs = thrd->dmac->pinfo->base;
- u32 val;
-
- if (is_manager(thrd))
- val = readl(regs + DS) & 0xf;
- else
- val = readl(regs + CS(thrd->id)) & 0xf;
-
- switch (val) {
- case DS_ST_STOP:
- return PL330_STATE_STOPPED;
- case DS_ST_EXEC:
- return PL330_STATE_EXECUTING;
- case DS_ST_CMISS:
- return PL330_STATE_CACHEMISS;
- case DS_ST_UPDTPC:
- return PL330_STATE_UPDTPC;
- case DS_ST_WFE:
- return PL330_STATE_WFE;
- case DS_ST_FAULT:
- return PL330_STATE_FAULTING;
- case DS_ST_ATBRR:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_ATBARRIER;
- case DS_ST_QBUSY:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_QUEUEBUSY;
- case DS_ST_WFP:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_WFP;
- case DS_ST_KILL:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_KILLING;
- case DS_ST_CMPLT:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_COMPLETING;
- case DS_ST_FLTCMP:
- if (is_manager(thrd))
- return PL330_STATE_INVALID;
- else
- return PL330_STATE_FAULT_COMPLETING;
- default:
- return PL330_STATE_INVALID;
- }
-}
-
-static void _stop(struct pl330_thread *thrd)
-{
- void __iomem *regs = thrd->dmac->pinfo->base;
- u8 insn[6] = {0, 0, 0, 0, 0, 0};
-
- if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
- UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
-
- /* Return if nothing needs to be done */
- if (_state(thrd) == PL330_STATE_COMPLETING
- || _state(thrd) == PL330_STATE_KILLING
- || _state(thrd) == PL330_STATE_STOPPED)
- return;
-
- _emit_KILL(0, insn);
-
- /* Stop generating interrupts for SEV */
- writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN);
-
- _execute_DBGINSN(thrd, insn, is_manager(thrd));
-}
-
-/* Start doing req 'idx' of thread 'thrd' */
-static bool _trigger(struct pl330_thread *thrd)
-{
- void __iomem *regs = thrd->dmac->pinfo->base;
- struct _pl330_req *req;
- struct pl330_req *r;
- struct _arg_GO go;
- unsigned ns;
- u8 insn[6] = {0, 0, 0, 0, 0, 0};
- int idx;
-
- /* Return if already ACTIVE */
- if (_state(thrd) != PL330_STATE_STOPPED)
- return true;
-
- idx = 1 - thrd->lstenq;
- if (!IS_FREE(&thrd->req[idx]))
- req = &thrd->req[idx];
- else {
- idx = thrd->lstenq;
- if (!IS_FREE(&thrd->req[idx]))
- req = &thrd->req[idx];
- else
- req = NULL;
- }
-
- /* Return if no request */
- if (!req || !req->r)
- return true;
-
- r = req->r;
-
- if (r->cfg)
- ns = r->cfg->nonsecure ? 1 : 0;
- else if (readl(regs + CS(thrd->id)) & CS_CNS)
- ns = 1;
- else
- ns = 0;
-
- /* See 'Abort Sources' point-4 at Page 2-25 */
- if (_manager_ns(thrd) && !ns)
- dev_info(thrd->dmac->pinfo->dev, "%s:%d Recipe for ABORT!\n",
- __func__, __LINE__);
-
- go.chan = thrd->id;
- go.addr = req->mc_bus;
- go.ns = ns;
- _emit_GO(0, insn, &go);
-
- /* Set to generate interrupts for SEV */
- writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
-
- /* Only manager can execute GO */
- _execute_DBGINSN(thrd, insn, true);
-
- thrd->req_running = idx;
-
- return true;
-}
-
-static bool _start(struct pl330_thread *thrd)
-{
- switch (_state(thrd)) {
- case PL330_STATE_FAULT_COMPLETING:
- UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
-
- if (_state(thrd) == PL330_STATE_KILLING)
- UNTIL(thrd, PL330_STATE_STOPPED)
-
- case PL330_STATE_FAULTING:
- _stop(thrd);
-
- case PL330_STATE_KILLING:
- case PL330_STATE_COMPLETING:
- UNTIL(thrd, PL330_STATE_STOPPED)
-
- case PL330_STATE_STOPPED:
- return _trigger(thrd);
-
- case PL330_STATE_WFP:
- case PL330_STATE_QUEUEBUSY:
- case PL330_STATE_ATBARRIER:
- case PL330_STATE_UPDTPC:
- case PL330_STATE_CACHEMISS:
- case PL330_STATE_EXECUTING:
- return true;
-
- case PL330_STATE_WFE: /* For RESUME, nothing yet */
- default:
- return false;
- }
-}
-
-static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
-{
- int off = 0;
-
- while (cyc--) {
- off += _emit_LD(dry_run, &buf[off], ALWAYS);
- off += _emit_RMB(dry_run, &buf[off]);
- off += _emit_ST(dry_run, &buf[off], ALWAYS);
- off += _emit_WMB(dry_run, &buf[off]);
- }
-
- return off;
-}
-
-static inline int _ldst_devtomem(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
-{
- int off = 0;
-
- while (cyc--) {
- off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
- off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->r->peri);
- off += _emit_ST(dry_run, &buf[off], ALWAYS);
- off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
- }
-
- return off;
-}
-
-static inline int _ldst_memtodev(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
-{
- int off = 0;
-
- while (cyc--) {
- off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri);
- off += _emit_LD(dry_run, &buf[off], ALWAYS);
- off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->r->peri);
- off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri);
- }
-
- return off;
-}
-
-static int _bursts(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
-{
- int off = 0;
-
- switch (pxs->r->rqtype) {
- case MEMTODEV:
- off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc);
- break;
- case DEVTOMEM:
- off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc);
- break;
- case MEMTOMEM:
- off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
- break;
- default:
- off += 0x40000000; /* Scare off the Client */
- break;
- }
-
- return off;
-}
-
-/* Returns bytes consumed and updates bursts */
-static inline int _loop(unsigned dry_run, u8 buf[],
- unsigned long *bursts, const struct _xfer_spec *pxs)
-{
- int cyc, cycmax, szlp, szlpend, szbrst, off;
- unsigned lcnt0, lcnt1, ljmp0, ljmp1;
- struct _arg_LPEND lpend;
-
- /* Max iterations possible in DMALP is 256 */
- if (*bursts >= 256*256) {
- lcnt1 = 256;
- lcnt0 = 256;
- cyc = *bursts / lcnt1 / lcnt0;
- } else if (*bursts > 256) {
- lcnt1 = 256;
- lcnt0 = *bursts / lcnt1;
- cyc = 1;
- } else {
- lcnt1 = *bursts;
- lcnt0 = 0;
- cyc = 1;
- }
-
- szlp = _emit_LP(1, buf, 0, 0);
- szbrst = _bursts(1, buf, pxs, 1);
-
- lpend.cond = ALWAYS;
- lpend.forever = false;
- lpend.loop = 0;
- lpend.bjump = 0;
- szlpend = _emit_LPEND(1, buf, &lpend);
-
- if (lcnt0) {
- szlp *= 2;
- szlpend *= 2;
- }
-
- /*
- * Max bursts that we can unroll due to limit on the
- * size of backward jump that can be encoded in DMALPEND
- * which is 8-bits and hence 255
- */
- cycmax = (255 - (szlp + szlpend)) / szbrst;
-
- cyc = (cycmax < cyc) ? cycmax : cyc;
-
- off = 0;
-
- if (lcnt0) {
- off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
- ljmp0 = off;
- }
-
- off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
- ljmp1 = off;
-
- off += _bursts(dry_run, &buf[off], pxs, cyc);
-
- lpend.cond = ALWAYS;
- lpend.forever = false;
- lpend.loop = 1;
- lpend.bjump = off - ljmp1;
- off += _emit_LPEND(dry_run, &buf[off], &lpend);
-
- if (lcnt0) {
- lpend.cond = ALWAYS;
- lpend.forever = false;
- lpend.loop = 0;
- lpend.bjump = off - ljmp0;
- off += _emit_LPEND(dry_run, &buf[off], &lpend);
- }
-
- *bursts = lcnt1 * cyc;
- if (lcnt0)
- *bursts *= lcnt0;
-
- return off;
-}
-
-static inline int _setup_loops(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs)
-{
- struct pl330_xfer *x = pxs->x;
- u32 ccr = pxs->ccr;
- unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
- int off = 0;
-
- while (bursts) {
- c = bursts;
- off += _loop(dry_run, &buf[off], &c, pxs);
- bursts -= c;
- }
-
- return off;
-}
-
-static inline int _setup_xfer(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs)
-{
- struct pl330_xfer *x = pxs->x;
- int off = 0;
-
- /* DMAMOV SAR, x->src_addr */
- off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
- /* DMAMOV DAR, x->dst_addr */
- off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
-
- /* Setup Loop(s) */
- off += _setup_loops(dry_run, &buf[off], pxs);
-
- return off;
-}
-
-/*
- * A req is a sequence of one or more xfer units.
- * Returns the number of bytes taken to setup the MC for the req.
- */
-static int _setup_req(unsigned dry_run, struct pl330_thread *thrd,
- unsigned index, struct _xfer_spec *pxs)
-{
- struct _pl330_req *req = &thrd->req[index];
- struct pl330_xfer *x;
- u8 *buf = req->mc_cpu;
- int off = 0;
-
- PL330_DBGMC_START(req->mc_bus);
-
- /* DMAMOV CCR, ccr */
- off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
-
- x = pxs->r->x;
- do {
- /* Error if xfer length is not aligned at burst size */
- if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
- return -EINVAL;
-
- pxs->x = x;
- off += _setup_xfer(dry_run, &buf[off], pxs);
-
- x = x->next;
- } while (x);
-
- /* DMASEV peripheral/event */
- off += _emit_SEV(dry_run, &buf[off], thrd->ev);
- /* DMAEND */
- off += _emit_END(dry_run, &buf[off]);
-
- return off;
-}
-
-static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
-{
- u32 ccr = 0;
-
- if (rqc->src_inc)
- ccr |= CC_SRCINC;
-
- if (rqc->dst_inc)
- ccr |= CC_DSTINC;
-
- /* We set same protection levels for Src and DST for now */
- if (rqc->privileged)
- ccr |= CC_SRCPRI | CC_DSTPRI;
- if (rqc->nonsecure)
- ccr |= CC_SRCNS | CC_DSTNS;
- if (rqc->insnaccess)
- ccr |= CC_SRCIA | CC_DSTIA;
-
- ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
- ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
-
- ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
- ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
-
- ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
- ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
-
- ccr |= (rqc->swap << CC_SWAP_SHFT);
-
- return ccr;
-}
-
-static inline bool _is_valid(u32 ccr)
-{
- enum pl330_dstcachectrl dcctl;
- enum pl330_srccachectrl scctl;
-
- dcctl = (ccr >> CC_DSTCCTRL_SHFT) & CC_DRCCCTRL_MASK;
- scctl = (ccr >> CC_SRCCCTRL_SHFT) & CC_SRCCCTRL_MASK;
-
- if (dcctl == DINVALID1 || dcctl == DINVALID2
- || scctl == SINVALID1 || scctl == SINVALID2)
- return false;
- else
- return true;
-}
-
-/*
- * Submit a list of xfers after which the client wants notification.
- * Client is not notified after each xfer unit, just once after all
- * xfer units are done or some error occurs.
- */
-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, 0);
- mark_free(thrd, 1);
-
- /* Clear the reset flag */
- pl330->dmac_tbd.reset_chan &= ~(1 << i);
- }
- }
-
- spin_unlock_irqrestore(&pl330->lock, flags);
-
- return;
-}
-
-/* Returns 1 if state was updated, 0 otherwise */
-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 occurred */
- struct pl330_thread *thrd;
- u32 inten = readl(regs + INTEN);
- int active;
-
- /* Clear the event */
- if (inten & (1 << ev))
- writel(1 << ev, regs + INTCLR);
-
- ret = 1;
-
- id = pl330->events[ev];
-
- thrd = &pl330->channels[id];
-
- active = thrd->req_running;
- if (active == -1) /* Aborted */
- continue;
-
- rqdone = &thrd->req[active];
- mark_free(thrd, active);
-
- /* Get going again ASAP */
- _start(thrd);
-
- /* For now, just make a list of callbacks to be done */
- list_add_tail(&rqdone->rqd, &pl330->req_done);
- }
- }
-
- /* Now that we are in no hurry, do the callbacks */
- while (!list_empty(&pl330->req_done)) {
- struct pl330_req *r;
-
- rqdone = container_of(pl330->req_done.next,
- struct _pl330_req, rqd);
-
- list_del_init(&rqdone->rqd);
-
- /* Detach the req */
- r = rqdone->r;
- rqdone->r = NULL;
-
- spin_unlock_irqrestore(&pl330->lock, flags);
- _callback(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;
- active = thrd->req_running;
-
- spin_lock_irqsave(&pl330->lock, flags);
-
- switch (op) {
- case PL330_OP_FLUSH:
- /* Make sure the channel is stopped */
- _stop(thrd);
-
- thrd->req[0].r = NULL;
- thrd->req[1].r = NULL;
- mark_free(thrd, 0);
- mark_free(thrd, 1);
- break;
-
- case PL330_OP_ABORT:
- /* Make sure the channel is stopped */
- _stop(thrd);
-
- /* ABORT is only for the active req */
- if (active == -1)
- break;
-
- thrd->req[active].r = NULL;
- mark_free(thrd, active);
-
- /* Start the next */
- case PL330_OP_START:
- if ((active == -1) && !_start(thrd))
- ret = -EIO;
- break;
-
- default:
- ret = -EINVAL;
- }
-
- spin_unlock_irqrestore(&pl330->lock, flags);
- return ret;
-}
-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->req_running;
-
- if (active == -1) {
- /* Indicate that the thread is not running */
- pstatus->top_req = NULL;
- pstatus->wait_req = NULL;
- } else {
- 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;
-}
-
-static bool _chan_ns(const struct pl330_info *pi, int i)
-{
- return pi->pcfg.irq_ns & (1 << i);
-}
-
-/* Upon success, returns IdentityToken for the
- * allocated channel, NULL otherwise.
- */
-void *pl330_request_channel(const struct pl330_info *pi)
-{
- struct pl330_thread *thrd = NULL;
- struct pl330_dmac *pl330;
- unsigned long flags;
- int chans, i;
-
- if (!pi || !pi->pl330_data)
- return NULL;
-
- pl330 = pi->pl330_data;
-
- if (pl330->state == DYING)
- return NULL;
-
- chans = pi->pcfg.num_chan;
-
- spin_lock_irqsave(&pl330->lock, flags);
-
- for (i = 0; i < chans; i++) {
- thrd = &pl330->channels[i];
- if ((thrd->free) && (!_manager_ns(thrd) ||
- _chan_ns(pi, i))) {
- thrd->ev = _alloc_event(thrd);
- if (thrd->ev >= 0) {
- thrd->free = false;
- thrd->lstenq = 1;
- thrd->req[0].r = NULL;
- mark_free(thrd, 0);
- thrd->req[1].r = NULL;
- mark_free(thrd, 1);
- break;
- }
- }
- thrd = NULL;
- }
-
- spin_unlock_irqrestore(&pl330->lock, flags);
-
- return thrd;
-}
-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, 0);
-
- thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
- + pi->mcbufsz / 2;
- thrd->req[1].mc_bus = thrd->req[0].mc_bus
- + pi->mcbufsz / 2;
- thrd->req[1].r = NULL;
- mark_free(thrd, 1);
-}
-
-static int dmac_alloc_threads(struct pl330_dmac *pl330)
-{
- struct pl330_info *pi = pl330->pinfo;
- int chans = pi->pcfg.num_chan;
- struct pl330_thread *thrd;
- int i;
-
- /* Allocate 1 Manager and 'chans' Channel threads */
- pl330->channels = kzalloc((1 + chans) * sizeof(*thrd),
- GFP_KERNEL);
- if (!pl330->channels)
- return -ENOMEM;
-
- /* Init Channel threads */
- for (i = 0; i < chans; i++) {
- thrd = &pl330->channels[i];
- thrd->id = i;
- thrd->dmac = pl330;
- _reset_thread(thrd);
- thrd->free = true;
- }
-
- /* MANAGER is indexed at the end */
- thrd = &pl330->channels[chans];
- thrd->id = chans;
- thrd->dmac = pl330;
- thrd->free = false;
- pl330->manager = thrd;
-
- return 0;
-}
-
-static int dmac_alloc_resources(struct pl330_dmac *pl330)
-{
- struct pl330_info *pi = pl330->pinfo;
- int chans = pi->pcfg.num_chan;
- int ret;
-
- /*
- * Alloc MicroCode buffer for 'chans' Channel threads.
- * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
- */
- pl330->mcode_cpu = dma_alloc_coherent(pi->dev,
- chans * pi->mcbufsz,
- &pl330->mcode_bus, GFP_KERNEL);
- if (!pl330->mcode_cpu) {
- dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
- __func__, __LINE__);
- return -ENOMEM;
- }
-
- ret = dmac_alloc_threads(pl330);
- if (ret) {
- dev_err(pi->dev, "%s:%d Can't to create channels for DMAC!\n",
- __func__, __LINE__);
- dma_free_coherent(pi->dev,
- chans * pi->mcbufsz,
- pl330->mcode_cpu, pl330->mcode_bus);
- return ret;
- }
-
- return 0;
-}
-
-int pl330_add(struct pl330_info *pi)
-{
- struct pl330_dmac *pl330;
- void __iomem *regs;
- int i, ret;
-
- if (!pi || !pi->dev)
- return -EINVAL;
-
- /* If already added */
- if (pi->pl330_data)
- return -EINVAL;
-
- /*
- * If the SoC can perform reset on the DMAC, then do it
- * before reading its configuration.
- */
- if (pi->dmac_reset)
- pi->dmac_reset(pi);
-
- regs = pi->base;
-
- /* Check if we can handle this DMAC */
- if ((get_id(pi, PERIPH_ID) & 0xfffff) != PERIPH_ID_VAL
- || get_id(pi, PCELL_ID) != PCELL_ID_VAL) {
- dev_err(pi->dev, "PERIPH_ID 0x%x, PCELL_ID 0x%x !\n",
- get_id(pi, PERIPH_ID), get_id(pi, PCELL_ID));
- return -EINVAL;
- }
-
- /* Read the configuration of the DMAC */
- read_dmac_config(pi);
-
- if (pi->pcfg.num_events == 0) {
- dev_err(pi->dev, "%s:%d Can't work without events!\n",
- __func__, __LINE__);
- return -EINVAL;
- }
-
- pl330 = kzalloc(sizeof(*pl330), GFP_KERNEL);
- if (!pl330) {
- dev_err(pi->dev, "%s:%d Can't allocate memory!\n",
- __func__, __LINE__);
- return -ENOMEM;
- }
-
- /* Assign the info structure and private data */
- pl330->pinfo = pi;
- pi->pl330_data = pl330;
-
- spin_lock_init(&pl330->lock);
-
- INIT_LIST_HEAD(&pl330->req_done);
-
- /* Use default MC buffer size if not provided */
- if (!pi->mcbufsz)
- pi->mcbufsz = MCODE_BUFF_PER_REQ * 2;
-
- /* Mark all events as free */
- for (i = 0; i < pi->pcfg.num_events; i++)
- pl330->events[i] = -1;
-
- /* Allocate resources needed by the DMAC */
- ret = dmac_alloc_resources(pl330);
- if (ret) {
- dev_err(pi->dev, "Unable to create channels for DMAC\n");
- kfree(pl330);
- return ret;
- }
-
- tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330);
-
- pl330->state = INIT;
-
- return 0;
-}
-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);