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Diffstat (limited to 'arch/arm/common/pl330.c')
| -rw-r--r-- | arch/arm/common/pl330.c | 1960 |
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 ff3ad224482..00000000000 --- 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); |