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1967 lines
41 KiB
C
1967 lines
41 KiB
C
![]() |
/* linux/arch/arm/common/pl330.c
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*
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* Copyright (C) 2010 Samsung Electronics Co Ltd.
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* Jaswinder Singh <jassi.brar@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/dma-mapping.h>
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#include <asm/hardware/pl330.h>
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/* Register and Bit field Definitions */
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#define DS 0x0
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#define DS_ST_STOP 0x0
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#define DS_ST_EXEC 0x1
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#define DS_ST_CMISS 0x2
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#define DS_ST_UPDTPC 0x3
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#define DS_ST_WFE 0x4
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#define DS_ST_ATBRR 0x5
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#define DS_ST_QBUSY 0x6
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#define DS_ST_WFP 0x7
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#define DS_ST_KILL 0x8
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#define DS_ST_CMPLT 0x9
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#define DS_ST_FLTCMP 0xe
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#define DS_ST_FAULT 0xf
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#define DPC 0x4
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#define INTEN 0x20
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#define ES 0x24
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#define INTSTATUS 0x28
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#define INTCLR 0x2c
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#define FSM 0x30
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#define FSC 0x34
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#define FTM 0x38
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#define _FTC 0x40
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#define FTC(n) (_FTC + (n)*0x4)
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#define _CS 0x100
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#define CS(n) (_CS + (n)*0x8)
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#define CS_CNS (1 << 21)
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#define _CPC 0x104
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#define CPC(n) (_CPC + (n)*0x8)
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#define _SA 0x400
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#define SA(n) (_SA + (n)*0x20)
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#define _DA 0x404
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#define DA(n) (_DA + (n)*0x20)
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#define _CC 0x408
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#define CC(n) (_CC + (n)*0x20)
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#define CC_SRCINC (1 << 0)
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#define CC_DSTINC (1 << 14)
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#define CC_SRCPRI (1 << 8)
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#define CC_DSTPRI (1 << 22)
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#define CC_SRCNS (1 << 9)
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#define CC_DSTNS (1 << 23)
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#define CC_SRCIA (1 << 10)
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#define CC_DSTIA (1 << 24)
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#define CC_SRCBRSTLEN_SHFT 4
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#define CC_DSTBRSTLEN_SHFT 18
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#define CC_SRCBRSTSIZE_SHFT 1
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#define CC_DSTBRSTSIZE_SHFT 15
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#define CC_SRCCCTRL_SHFT 11
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#define CC_SRCCCTRL_MASK 0x7
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#define CC_DSTCCTRL_SHFT 25
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#define CC_DRCCCTRL_MASK 0x7
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#define CC_SWAP_SHFT 28
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#define _LC0 0x40c
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#define LC0(n) (_LC0 + (n)*0x20)
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#define _LC1 0x410
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#define LC1(n) (_LC1 + (n)*0x20)
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#define DBGSTATUS 0xd00
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#define DBG_BUSY (1 << 0)
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#define DBGCMD 0xd04
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#define DBGINST0 0xd08
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#define DBGINST1 0xd0c
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#define CR0 0xe00
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#define CR1 0xe04
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#define CR2 0xe08
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#define CR3 0xe0c
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#define CR4 0xe10
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#define CRD 0xe14
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#define PERIPH_ID 0xfe0
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#define PCELL_ID 0xff0
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#define CR0_PERIPH_REQ_SET (1 << 0)
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#define CR0_BOOT_EN_SET (1 << 1)
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#define CR0_BOOT_MAN_NS (1 << 2)
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#define CR0_NUM_CHANS_SHIFT 4
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#define CR0_NUM_CHANS_MASK 0x7
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#define CR0_NUM_PERIPH_SHIFT 12
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#define CR0_NUM_PERIPH_MASK 0x1f
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#define CR0_NUM_EVENTS_SHIFT 17
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#define CR0_NUM_EVENTS_MASK 0x1f
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#define CR1_ICACHE_LEN_SHIFT 0
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#define CR1_ICACHE_LEN_MASK 0x7
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#define CR1_NUM_ICACHELINES_SHIFT 4
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#define CR1_NUM_ICACHELINES_MASK 0xf
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#define CRD_DATA_WIDTH_SHIFT 0
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#define CRD_DATA_WIDTH_MASK 0x7
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#define CRD_WR_CAP_SHIFT 4
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#define CRD_WR_CAP_MASK 0x7
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#define CRD_WR_Q_DEP_SHIFT 8
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#define CRD_WR_Q_DEP_MASK 0xf
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#define CRD_RD_CAP_SHIFT 12
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#define CRD_RD_CAP_MASK 0x7
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#define CRD_RD_Q_DEP_SHIFT 16
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#define CRD_RD_Q_DEP_MASK 0xf
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#define CRD_DATA_BUFF_SHIFT 20
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#define CRD_DATA_BUFF_MASK 0x3ff
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#define PART 0x330
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#define DESIGNER 0x41
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#define REVISION 0x0
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#define INTEG_CFG 0x0
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#define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12) \
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| (REVISION << 20) | (INTEG_CFG << 24))
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#define PCELL_ID_VAL 0xb105f00d
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#define PL330_STATE_STOPPED (1 << 0)
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#define PL330_STATE_EXECUTING (1 << 1)
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#define PL330_STATE_WFE (1 << 2)
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#define PL330_STATE_FAULTING (1 << 3)
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#define PL330_STATE_COMPLETING (1 << 4)
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#define PL330_STATE_WFP (1 << 5)
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#define PL330_STATE_KILLING (1 << 6)
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#define PL330_STATE_FAULT_COMPLETING (1 << 7)
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#define PL330_STATE_CACHEMISS (1 << 8)
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#define PL330_STATE_UPDTPC (1 << 9)
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#define PL330_STATE_ATBARRIER (1 << 10)
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#define PL330_STATE_QUEUEBUSY (1 << 11)
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#define PL330_STATE_INVALID (1 << 15)
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#define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
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| PL330_STATE_WFE | PL330_STATE_FAULTING)
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#define CMD_DMAADDH 0x54
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#define CMD_DMAEND 0x00
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#define CMD_DMAFLUSHP 0x35
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#define CMD_DMAGO 0xa0
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#define CMD_DMALD 0x04
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#define CMD_DMALDP 0x25
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#define CMD_DMALP 0x20
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#define CMD_DMALPEND 0x28
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#define CMD_DMAKILL 0x01
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#define CMD_DMAMOV 0xbc
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#define CMD_DMANOP 0x18
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#define CMD_DMARMB 0x12
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#define CMD_DMASEV 0x34
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#define CMD_DMAST 0x08
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#define CMD_DMASTP 0x29
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#define CMD_DMASTZ 0x0c
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#define CMD_DMAWFE 0x36
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#define CMD_DMAWFP 0x30
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#define CMD_DMAWMB 0x13
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#define SZ_DMAADDH 3
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#define SZ_DMAEND 1
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#define SZ_DMAFLUSHP 2
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#define SZ_DMALD 1
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#define SZ_DMALDP 2
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#define SZ_DMALP 2
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#define SZ_DMALPEND 2
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#define SZ_DMAKILL 1
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#define SZ_DMAMOV 6
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#define SZ_DMANOP 1
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#define SZ_DMARMB 1
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#define SZ_DMASEV 2
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#define SZ_DMAST 1
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#define SZ_DMASTP 2
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#define SZ_DMASTZ 1
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#define SZ_DMAWFE 2
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#define SZ_DMAWFP 2
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#define SZ_DMAWMB 1
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#define SZ_DMAGO 6
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#define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
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#define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
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#define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
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#define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
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/*
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* With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
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* at 1byte/burst for P<->M and M<->M respectively.
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* For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
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* should be enough for P<->M and M<->M respectively.
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*/
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#define MCODE_BUFF_PER_REQ 256
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/*
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* Mark a _pl330_req as free.
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* We do it by writing DMAEND as the first instruction
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* because no valid request is going to have DMAEND as
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* its first instruction to execute.
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*/
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#define MARK_FREE(req) do { \
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_emit_END(0, (req)->mc_cpu); \
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(req)->mc_len = 0; \
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} while (0)
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/* If the _pl330_req is available to the client */
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#define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND)
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/* Use this _only_ to wait on transient states */
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#define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
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#ifdef PL330_DEBUG_MCGEN
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static unsigned cmd_line;
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#define PL330_DBGCMD_DUMP(off, x...) do { \
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printk("%x:", cmd_line); \
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printk(x); \
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cmd_line += off; \
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} while (0)
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#define PL330_DBGMC_START(addr) (cmd_line = addr)
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#else
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#define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
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#define PL330_DBGMC_START(addr) do {} while (0)
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#endif
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struct _xfer_spec {
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u32 ccr;
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struct pl330_req *r;
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struct pl330_xfer *x;
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};
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enum dmamov_dst {
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SAR = 0,
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CCR,
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DAR,
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};
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enum pl330_dst {
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SRC = 0,
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DST,
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};
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enum pl330_cond {
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SINGLE,
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BURST,
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ALWAYS,
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};
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struct _pl330_req {
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u32 mc_bus;
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void *mc_cpu;
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/* Number of bytes taken to setup MC for the req */
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u32 mc_len;
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struct pl330_req *r;
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/* Hook to attach to DMAC's list of reqs with due callback */
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struct list_head rqd;
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};
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/* ToBeDone for tasklet */
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struct _pl330_tbd {
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bool reset_dmac;
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bool reset_mngr;
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u8 reset_chan;
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};
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/* A DMAC Thread */
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struct pl330_thread {
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u8 id;
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int ev;
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/* If the channel is not yet acquired by any client */
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bool free;
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/* Parent DMAC */
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struct pl330_dmac *dmac;
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/* Only two at a time */
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struct _pl330_req req[2];
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/* Index of the last submitted request */
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unsigned lstenq;
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};
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enum pl330_dmac_state {
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UNINIT,
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INIT,
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DYING,
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};
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/* A DMAC */
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struct pl330_dmac {
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spinlock_t lock;
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/* Holds list of reqs with due callbacks */
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struct list_head req_done;
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/* Pointer to platform specific stuff */
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struct pl330_info *pinfo;
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/* Maximum possible events/irqs */
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int events[32];
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/* BUS address of MicroCode buffer */
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u32 mcode_bus;
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/* CPU address of MicroCode buffer */
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void *mcode_cpu;
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/* List of all Channel threads */
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struct pl330_thread *channels;
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/* Pointer to the MANAGER thread */
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struct pl330_thread *manager;
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/* To handle bad news in interrupt */
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struct tasklet_struct tasks;
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struct _pl330_tbd dmac_tbd;
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/* State of DMAC operation */
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enum pl330_dmac_state state;
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};
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static inline void _callback(struct pl330_req *r, enum pl330_op_err err)
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{
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if (r && r->xfer_cb)
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r->xfer_cb(r->token, err);
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}
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static inline bool _queue_empty(struct pl330_thread *thrd)
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{
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return (IS_FREE(&thrd->req[0]) && IS_FREE(&thrd->req[1]))
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? true : false;
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}
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static inline bool _queue_full(struct pl330_thread *thrd)
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{
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return (IS_FREE(&thrd->req[0]) || IS_FREE(&thrd->req[1]))
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? false : true;
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}
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static inline bool is_manager(struct pl330_thread *thrd)
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{
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struct pl330_dmac *pl330 = thrd->dmac;
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/* MANAGER is indexed at the end */
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if (thrd->id == pl330->pinfo->pcfg.num_chan)
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return true;
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else
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return false;
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}
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/* If manager of the thread is in Non-Secure mode */
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static inline bool _manager_ns(struct pl330_thread *thrd)
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{
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struct pl330_dmac *pl330 = thrd->dmac;
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return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false;
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}
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static inline u32 get_id(struct pl330_info *pi, u32 off)
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{
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void __iomem *regs = pi->base;
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u32 id = 0;
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id |= (readb(regs + off + 0x0) << 0);
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id |= (readb(regs + off + 0x4) << 8);
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id |= (readb(regs + off + 0x8) << 16);
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id |= (readb(regs + off + 0xc) << 24);
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return id;
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}
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static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[],
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enum pl330_dst da, u16 val)
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{
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if (dry_run)
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return SZ_DMAADDH;
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buf[0] = CMD_DMAADDH;
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buf[0] |= (da << 1);
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*((u16 *)&buf[1]) = val;
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PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n",
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da == 1 ? "DA" : "SA", val);
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return SZ_DMAADDH;
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}
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static inline u32 _emit_END(unsigned dry_run, u8 buf[])
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{
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if (dry_run)
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return SZ_DMAEND;
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buf[0] = CMD_DMAEND;
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PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
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return SZ_DMAEND;
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}
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static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
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{
|
||
|
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);
|