1556 lines
44 KiB
C
1556 lines
44 KiB
C
/*
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* EDMA3 support for DaVinci
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*
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* Copyright (C) 2006-2009 Texas Instruments.
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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/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <mach/edma.h>
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/* Offsets matching "struct edmacc_param" */
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#define PARM_OPT 0x00
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#define PARM_SRC 0x04
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#define PARM_A_B_CNT 0x08
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#define PARM_DST 0x0c
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#define PARM_SRC_DST_BIDX 0x10
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#define PARM_LINK_BCNTRLD 0x14
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#define PARM_SRC_DST_CIDX 0x18
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#define PARM_CCNT 0x1c
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#define PARM_SIZE 0x20
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/* Offsets for EDMA CC global channel registers and their shadows */
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#define SH_ER 0x00 /* 64 bits */
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#define SH_ECR 0x08 /* 64 bits */
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#define SH_ESR 0x10 /* 64 bits */
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#define SH_CER 0x18 /* 64 bits */
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#define SH_EER 0x20 /* 64 bits */
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#define SH_EECR 0x28 /* 64 bits */
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#define SH_EESR 0x30 /* 64 bits */
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#define SH_SER 0x38 /* 64 bits */
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#define SH_SECR 0x40 /* 64 bits */
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#define SH_IER 0x50 /* 64 bits */
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#define SH_IECR 0x58 /* 64 bits */
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#define SH_IESR 0x60 /* 64 bits */
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#define SH_IPR 0x68 /* 64 bits */
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#define SH_ICR 0x70 /* 64 bits */
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#define SH_IEVAL 0x78
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#define SH_QER 0x80
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#define SH_QEER 0x84
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#define SH_QEECR 0x88
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#define SH_QEESR 0x8c
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#define SH_QSER 0x90
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#define SH_QSECR 0x94
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#define SH_SIZE 0x200
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/* Offsets for EDMA CC global registers */
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#define EDMA_REV 0x0000
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#define EDMA_CCCFG 0x0004
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#define EDMA_QCHMAP 0x0200 /* 8 registers */
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#define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
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#define EDMA_QDMAQNUM 0x0260
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#define EDMA_QUETCMAP 0x0280
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#define EDMA_QUEPRI 0x0284
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#define EDMA_EMR 0x0300 /* 64 bits */
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#define EDMA_EMCR 0x0308 /* 64 bits */
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#define EDMA_QEMR 0x0310
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#define EDMA_QEMCR 0x0314
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#define EDMA_CCERR 0x0318
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#define EDMA_CCERRCLR 0x031c
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#define EDMA_EEVAL 0x0320
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#define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
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#define EDMA_QRAE 0x0380 /* 4 registers */
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#define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
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#define EDMA_QSTAT 0x0600 /* 2 registers */
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#define EDMA_QWMTHRA 0x0620
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#define EDMA_QWMTHRB 0x0624
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#define EDMA_CCSTAT 0x0640
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#define EDMA_M 0x1000 /* global channel registers */
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#define EDMA_ECR 0x1008
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#define EDMA_ECRH 0x100C
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#define EDMA_SHADOW0 0x2000 /* 4 regions shadowing global channels */
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#define EDMA_PARM 0x4000 /* 128 param entries */
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#define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
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#define EDMA_DCHMAP 0x0100 /* 64 registers */
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#define CHMAP_EXIST BIT(24)
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#define EDMA_MAX_DMACH 64
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#define EDMA_MAX_PARAMENTRY 512
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#define EDMA_MAX_CC 2
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/*****************************************************************************/
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static void __iomem *edmacc_regs_base[EDMA_MAX_CC];
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static inline unsigned int edma_read(unsigned ctlr, int offset)
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{
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return (unsigned int)__raw_readl(edmacc_regs_base[ctlr] + offset);
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}
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static inline void edma_write(unsigned ctlr, int offset, int val)
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{
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__raw_writel(val, edmacc_regs_base[ctlr] + offset);
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}
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static inline void edma_modify(unsigned ctlr, int offset, unsigned and,
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unsigned or)
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{
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unsigned val = edma_read(ctlr, offset);
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val &= and;
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val |= or;
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edma_write(ctlr, offset, val);
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}
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static inline void edma_and(unsigned ctlr, int offset, unsigned and)
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{
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unsigned val = edma_read(ctlr, offset);
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val &= and;
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edma_write(ctlr, offset, val);
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}
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static inline void edma_or(unsigned ctlr, int offset, unsigned or)
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{
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unsigned val = edma_read(ctlr, offset);
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val |= or;
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edma_write(ctlr, offset, val);
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}
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static inline unsigned int edma_read_array(unsigned ctlr, int offset, int i)
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{
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return edma_read(ctlr, offset + (i << 2));
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}
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static inline void edma_write_array(unsigned ctlr, int offset, int i,
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unsigned val)
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{
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edma_write(ctlr, offset + (i << 2), val);
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}
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static inline void edma_modify_array(unsigned ctlr, int offset, int i,
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unsigned and, unsigned or)
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{
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edma_modify(ctlr, offset + (i << 2), and, or);
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}
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static inline void edma_or_array(unsigned ctlr, int offset, int i, unsigned or)
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{
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edma_or(ctlr, offset + (i << 2), or);
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}
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static inline void edma_or_array2(unsigned ctlr, int offset, int i, int j,
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unsigned or)
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{
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edma_or(ctlr, offset + ((i*2 + j) << 2), or);
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}
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static inline void edma_write_array2(unsigned ctlr, int offset, int i, int j,
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unsigned val)
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{
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edma_write(ctlr, offset + ((i*2 + j) << 2), val);
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}
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static inline unsigned int edma_shadow0_read(unsigned ctlr, int offset)
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{
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return edma_read(ctlr, EDMA_SHADOW0 + offset);
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}
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static inline unsigned int edma_shadow0_read_array(unsigned ctlr, int offset,
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int i)
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{
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return edma_read(ctlr, EDMA_SHADOW0 + offset + (i << 2));
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}
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static inline void edma_shadow0_write(unsigned ctlr, int offset, unsigned val)
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{
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edma_write(ctlr, EDMA_SHADOW0 + offset, val);
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}
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static inline void edma_shadow0_write_array(unsigned ctlr, int offset, int i,
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unsigned val)
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{
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edma_write(ctlr, EDMA_SHADOW0 + offset + (i << 2), val);
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}
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static inline unsigned int edma_parm_read(unsigned ctlr, int offset,
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int param_no)
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{
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return edma_read(ctlr, EDMA_PARM + offset + (param_no << 5));
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}
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static inline void edma_parm_write(unsigned ctlr, int offset, int param_no,
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unsigned val)
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{
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edma_write(ctlr, EDMA_PARM + offset + (param_no << 5), val);
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}
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static inline void edma_parm_modify(unsigned ctlr, int offset, int param_no,
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unsigned and, unsigned or)
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{
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edma_modify(ctlr, EDMA_PARM + offset + (param_no << 5), and, or);
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}
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static inline void edma_parm_and(unsigned ctlr, int offset, int param_no,
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unsigned and)
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{
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edma_and(ctlr, EDMA_PARM + offset + (param_no << 5), and);
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}
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static inline void edma_parm_or(unsigned ctlr, int offset, int param_no,
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unsigned or)
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{
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edma_or(ctlr, EDMA_PARM + offset + (param_no << 5), or);
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}
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/*****************************************************************************/
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/* actual number of DMA channels and slots on this silicon */
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struct edma {
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/* how many dma resources of each type */
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unsigned num_channels;
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unsigned num_region;
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unsigned num_slots;
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unsigned num_tc;
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unsigned num_cc;
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enum dma_event_q default_queue;
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/* list of channels with no even trigger; terminated by "-1" */
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const s8 *noevent;
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/* The edma_inuse bit for each PaRAM slot is clear unless the
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* channel is in use ... by ARM or DSP, for QDMA, or whatever.
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*/
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DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
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/* The edma_unused bit for each channel is clear unless
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* it is not being used on this platform. It uses a bit
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* of SOC-specific initialization code.
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*/
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DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
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unsigned irq_res_start;
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unsigned irq_res_end;
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struct dma_interrupt_data {
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void (*callback)(unsigned channel, unsigned short ch_status,
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void *data);
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void *data;
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} intr_data[EDMA_MAX_DMACH];
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};
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static struct edma *edma_cc[EDMA_MAX_CC];
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static int arch_num_cc;
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/* dummy param set used to (re)initialize parameter RAM slots */
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static const struct edmacc_param dummy_paramset = {
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.link_bcntrld = 0xffff,
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.ccnt = 1,
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};
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/*****************************************************************************/
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static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
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enum dma_event_q queue_no)
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{
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int bit = (ch_no & 0x7) * 4;
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/* default to low priority queue */
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if (queue_no == EVENTQ_DEFAULT)
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queue_no = edma_cc[ctlr]->default_queue;
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queue_no &= 7;
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edma_modify_array(ctlr, EDMA_DMAQNUM, (ch_no >> 3),
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~(0x7 << bit), queue_no << bit);
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}
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static void __init map_queue_tc(unsigned ctlr, int queue_no, int tc_no)
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{
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int bit = queue_no * 4;
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edma_modify(ctlr, EDMA_QUETCMAP, ~(0x7 << bit), ((tc_no & 0x7) << bit));
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}
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static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
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int priority)
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{
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int bit = queue_no * 4;
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edma_modify(ctlr, EDMA_QUEPRI, ~(0x7 << bit),
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((priority & 0x7) << bit));
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}
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/**
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* map_dmach_param - Maps channel number to param entry number
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*
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* This maps the dma channel number to param entry numberter. In
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* other words using the DMA channel mapping registers a param entry
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* can be mapped to any channel
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*
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* Callers are responsible for ensuring the channel mapping logic is
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* included in that particular EDMA variant (Eg : dm646x)
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*
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*/
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static void __init map_dmach_param(unsigned ctlr)
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{
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int i;
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for (i = 0; i < EDMA_MAX_DMACH; i++)
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edma_write_array(ctlr, EDMA_DCHMAP , i , (i << 5));
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}
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static inline void
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setup_dma_interrupt(unsigned lch,
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void (*callback)(unsigned channel, u16 ch_status, void *data),
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void *data)
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{
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unsigned ctlr;
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ctlr = EDMA_CTLR(lch);
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lch = EDMA_CHAN_SLOT(lch);
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if (!callback) {
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edma_shadow0_write_array(ctlr, SH_IECR, lch >> 5,
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(1 << (lch & 0x1f)));
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}
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edma_cc[ctlr]->intr_data[lch].callback = callback;
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edma_cc[ctlr]->intr_data[lch].data = data;
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if (callback) {
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edma_shadow0_write_array(ctlr, SH_ICR, lch >> 5,
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(1 << (lch & 0x1f)));
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edma_shadow0_write_array(ctlr, SH_IESR, lch >> 5,
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(1 << (lch & 0x1f)));
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}
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}
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static int irq2ctlr(int irq)
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{
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if (irq >= edma_cc[0]->irq_res_start && irq <= edma_cc[0]->irq_res_end)
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return 0;
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else if (irq >= edma_cc[1]->irq_res_start &&
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irq <= edma_cc[1]->irq_res_end)
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return 1;
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return -1;
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}
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/******************************************************************************
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*
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* DMA interrupt handler
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*
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*****************************************************************************/
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static irqreturn_t dma_irq_handler(int irq, void *data)
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{
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int i;
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unsigned ctlr;
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unsigned int cnt = 0;
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ctlr = irq2ctlr(irq);
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dev_dbg(data, "dma_irq_handler\n");
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if ((edma_shadow0_read_array(ctlr, SH_IPR, 0) == 0)
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&& (edma_shadow0_read_array(ctlr, SH_IPR, 1) == 0))
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return IRQ_NONE;
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while (1) {
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int j;
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if (edma_shadow0_read_array(ctlr, SH_IPR, 0) &
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edma_shadow0_read_array(ctlr, SH_IER, 0))
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j = 0;
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else if (edma_shadow0_read_array(ctlr, SH_IPR, 1) &
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edma_shadow0_read_array(ctlr, SH_IER, 1))
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j = 1;
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else
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break;
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dev_dbg(data, "IPR%d %08x\n", j,
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edma_shadow0_read_array(ctlr, SH_IPR, j));
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for (i = 0; i < 32; i++) {
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int k = (j << 5) + i;
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if ((edma_shadow0_read_array(ctlr, SH_IPR, j) & BIT(i))
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&& (edma_shadow0_read_array(ctlr,
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SH_IER, j) & BIT(i))) {
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/* Clear the corresponding IPR bits */
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edma_shadow0_write_array(ctlr, SH_ICR, j,
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(1 << i));
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if (edma_cc[ctlr]->intr_data[k].callback) {
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edma_cc[ctlr]->intr_data[k].callback(
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k, DMA_COMPLETE,
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edma_cc[ctlr]->intr_data[k].
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data);
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}
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}
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}
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cnt++;
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if (cnt > 10)
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break;
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}
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edma_shadow0_write(ctlr, SH_IEVAL, 1);
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return IRQ_HANDLED;
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}
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/******************************************************************************
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*
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* DMA error interrupt handler
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*
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*****************************************************************************/
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static irqreturn_t dma_ccerr_handler(int irq, void *data)
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{
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int i;
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unsigned ctlr;
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unsigned int cnt = 0;
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ctlr = irq2ctlr(irq);
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dev_dbg(data, "dma_ccerr_handler\n");
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if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
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(edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
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(edma_read(ctlr, EDMA_QEMR) == 0) &&
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(edma_read(ctlr, EDMA_CCERR) == 0))
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return IRQ_NONE;
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while (1) {
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int j = -1;
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if (edma_read_array(ctlr, EDMA_EMR, 0))
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j = 0;
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else if (edma_read_array(ctlr, EDMA_EMR, 1))
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j = 1;
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if (j >= 0) {
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dev_dbg(data, "EMR%d %08x\n", j,
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edma_read_array(ctlr, EDMA_EMR, j));
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for (i = 0; i < 32; i++) {
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int k = (j << 5) + i;
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if (edma_read_array(ctlr, EDMA_EMR, j) &
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(1 << i)) {
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/* Clear the corresponding EMR bits */
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edma_write_array(ctlr, EDMA_EMCR, j,
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1 << i);
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/* Clear any SER */
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edma_shadow0_write_array(ctlr, SH_SECR,
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j, (1 << i));
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if (edma_cc[ctlr]->intr_data[k].
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callback) {
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edma_cc[ctlr]->intr_data[k].
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callback(k,
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DMA_CC_ERROR,
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edma_cc[ctlr]->intr_data
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[k].data);
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}
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}
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}
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} else if (edma_read(ctlr, EDMA_QEMR)) {
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dev_dbg(data, "QEMR %02x\n",
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edma_read(ctlr, EDMA_QEMR));
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for (i = 0; i < 8; i++) {
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if (edma_read(ctlr, EDMA_QEMR) & (1 << i)) {
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/* Clear the corresponding IPR bits */
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edma_write(ctlr, EDMA_QEMCR, 1 << i);
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edma_shadow0_write(ctlr, SH_QSECR,
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(1 << i));
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/* NOTE: not reported!! */
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}
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}
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} else if (edma_read(ctlr, EDMA_CCERR)) {
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dev_dbg(data, "CCERR %08x\n",
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edma_read(ctlr, EDMA_CCERR));
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/* FIXME: CCERR.BIT(16) ignored! much better
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* to just write CCERRCLR with CCERR value...
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*/
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for (i = 0; i < 8; i++) {
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if (edma_read(ctlr, EDMA_CCERR) & (1 << i)) {
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/* Clear the corresponding IPR bits */
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edma_write(ctlr, EDMA_CCERRCLR, 1 << i);
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/* NOTE: not reported!! */
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}
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}
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}
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if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0)
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&& (edma_read_array(ctlr, EDMA_EMR, 1) == 0)
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&& (edma_read(ctlr, EDMA_QEMR) == 0)
|
|
&& (edma_read(ctlr, EDMA_CCERR) == 0)) {
|
|
break;
|
|
}
|
|
cnt++;
|
|
if (cnt > 10)
|
|
break;
|
|
}
|
|
edma_write(ctlr, EDMA_EEVAL, 1);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Transfer controller error interrupt handlers
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#define tc_errs_handled false /* disabled as long as they're NOPs */
|
|
|
|
static irqreturn_t dma_tc0err_handler(int irq, void *data)
|
|
{
|
|
dev_dbg(data, "dma_tc0err_handler\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t dma_tc1err_handler(int irq, void *data)
|
|
{
|
|
dev_dbg(data, "dma_tc1err_handler\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int reserve_contiguous_slots(int ctlr, unsigned int id,
|
|
unsigned int num_slots,
|
|
unsigned int start_slot)
|
|
{
|
|
int i, j;
|
|
unsigned int count = num_slots;
|
|
int stop_slot = start_slot;
|
|
DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
|
|
|
|
for (i = start_slot; i < edma_cc[ctlr]->num_slots; ++i) {
|
|
j = EDMA_CHAN_SLOT(i);
|
|
if (!test_and_set_bit(j, edma_cc[ctlr]->edma_inuse)) {
|
|
/* Record our current beginning slot */
|
|
if (count == num_slots)
|
|
stop_slot = i;
|
|
|
|
count--;
|
|
set_bit(j, tmp_inuse);
|
|
|
|
if (count == 0)
|
|
break;
|
|
} else {
|
|
clear_bit(j, tmp_inuse);
|
|
|
|
if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
|
|
stop_slot = i;
|
|
break;
|
|
} else
|
|
count = num_slots;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We have to clear any bits that we set
|
|
* if we run out parameter RAM slots, i.e we do find a set
|
|
* of contiguous parameter RAM slots but do not find the exact number
|
|
* requested as we may reach the total number of parameter RAM slots
|
|
*/
|
|
if (i == edma_cc[ctlr]->num_slots)
|
|
stop_slot = i;
|
|
|
|
for (j = start_slot; j < stop_slot; j++)
|
|
if (test_bit(j, tmp_inuse))
|
|
clear_bit(j, edma_cc[ctlr]->edma_inuse);
|
|
|
|
if (count)
|
|
return -EBUSY;
|
|
|
|
for (j = i - num_slots + 1; j <= i; ++j)
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
|
|
&dummy_paramset, PARM_SIZE);
|
|
|
|
return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
|
|
}
|
|
|
|
static int prepare_unused_channel_list(struct device *dev, void *data)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int i, ctlr;
|
|
|
|
for (i = 0; i < pdev->num_resources; i++) {
|
|
if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
|
|
(int)pdev->resource[i].start >= 0) {
|
|
ctlr = EDMA_CTLR(pdev->resource[i].start);
|
|
clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
|
|
edma_cc[ctlr]->edma_unused);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
static bool unused_chan_list_done;
|
|
|
|
/* Resource alloc/free: dma channels, parameter RAM slots */
|
|
|
|
/**
|
|
* edma_alloc_channel - allocate DMA channel and paired parameter RAM
|
|
* @channel: specific channel to allocate; negative for "any unmapped channel"
|
|
* @callback: optional; to be issued on DMA completion or errors
|
|
* @data: passed to callback
|
|
* @eventq_no: an EVENTQ_* constant, used to choose which Transfer
|
|
* Controller (TC) executes requests using this channel. Use
|
|
* EVENTQ_DEFAULT unless you really need a high priority queue.
|
|
*
|
|
* This allocates a DMA channel and its associated parameter RAM slot.
|
|
* The parameter RAM is initialized to hold a dummy transfer.
|
|
*
|
|
* Normal use is to pass a specific channel number as @channel, to make
|
|
* use of hardware events mapped to that channel. When the channel will
|
|
* be used only for software triggering or event chaining, channels not
|
|
* mapped to hardware events (or mapped to unused events) are preferable.
|
|
*
|
|
* DMA transfers start from a channel using edma_start(), or by
|
|
* chaining. When the transfer described in that channel's parameter RAM
|
|
* slot completes, that slot's data may be reloaded through a link.
|
|
*
|
|
* DMA errors are only reported to the @callback associated with the
|
|
* channel driving that transfer, but transfer completion callbacks can
|
|
* be sent to another channel under control of the TCC field in
|
|
* the option word of the transfer's parameter RAM set. Drivers must not
|
|
* use DMA transfer completion callbacks for channels they did not allocate.
|
|
* (The same applies to TCC codes used in transfer chaining.)
|
|
*
|
|
* Returns the number of the channel, else negative errno.
|
|
*/
|
|
int edma_alloc_channel(int channel,
|
|
void (*callback)(unsigned channel, u16 ch_status, void *data),
|
|
void *data,
|
|
enum dma_event_q eventq_no)
|
|
{
|
|
unsigned i, done = 0, ctlr = 0;
|
|
int ret = 0;
|
|
|
|
if (!unused_chan_list_done) {
|
|
/*
|
|
* Scan all the platform devices to find out the EDMA channels
|
|
* used and clear them in the unused list, making the rest
|
|
* available for ARM usage.
|
|
*/
|
|
ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
|
|
prepare_unused_channel_list);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
unused_chan_list_done = true;
|
|
}
|
|
|
|
if (channel >= 0) {
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
}
|
|
|
|
if (channel < 0) {
|
|
for (i = 0; i < arch_num_cc; i++) {
|
|
channel = 0;
|
|
for (;;) {
|
|
channel = find_next_bit(edma_cc[i]->edma_unused,
|
|
edma_cc[i]->num_channels,
|
|
channel);
|
|
if (channel == edma_cc[i]->num_channels)
|
|
break;
|
|
if (!test_and_set_bit(channel,
|
|
edma_cc[i]->edma_inuse)) {
|
|
done = 1;
|
|
ctlr = i;
|
|
break;
|
|
}
|
|
channel++;
|
|
}
|
|
if (done)
|
|
break;
|
|
}
|
|
if (!done)
|
|
return -ENOMEM;
|
|
} else if (channel >= edma_cc[ctlr]->num_channels) {
|
|
return -EINVAL;
|
|
} else if (test_and_set_bit(channel, edma_cc[ctlr]->edma_inuse)) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* ensure access through shadow region 0 */
|
|
edma_or_array2(ctlr, EDMA_DRAE, 0, channel >> 5, 1 << (channel & 0x1f));
|
|
|
|
/* ensure no events are pending */
|
|
edma_stop(EDMA_CTLR_CHAN(ctlr, channel));
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
|
|
&dummy_paramset, PARM_SIZE);
|
|
|
|
if (callback)
|
|
setup_dma_interrupt(EDMA_CTLR_CHAN(ctlr, channel),
|
|
callback, data);
|
|
|
|
map_dmach_queue(ctlr, channel, eventq_no);
|
|
|
|
return EDMA_CTLR_CHAN(ctlr, channel);
|
|
}
|
|
EXPORT_SYMBOL(edma_alloc_channel);
|
|
|
|
|
|
/**
|
|
* edma_free_channel - deallocate DMA channel
|
|
* @channel: dma channel returned from edma_alloc_channel()
|
|
*
|
|
* This deallocates the DMA channel and associated parameter RAM slot
|
|
* allocated by edma_alloc_channel().
|
|
*
|
|
* Callers are responsible for ensuring the channel is inactive, and
|
|
* will not be reactivated by linking, chaining, or software calls to
|
|
* edma_start().
|
|
*/
|
|
void edma_free_channel(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel >= edma_cc[ctlr]->num_channels)
|
|
return;
|
|
|
|
setup_dma_interrupt(channel, NULL, NULL);
|
|
/* REVISIT should probably take out of shadow region 0 */
|
|
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
|
|
&dummy_paramset, PARM_SIZE);
|
|
clear_bit(channel, edma_cc[ctlr]->edma_inuse);
|
|
}
|
|
EXPORT_SYMBOL(edma_free_channel);
|
|
|
|
/**
|
|
* edma_alloc_slot - allocate DMA parameter RAM
|
|
* @slot: specific slot to allocate; negative for "any unused slot"
|
|
*
|
|
* This allocates a parameter RAM slot, initializing it to hold a
|
|
* dummy transfer. Slots allocated using this routine have not been
|
|
* mapped to a hardware DMA channel, and will normally be used by
|
|
* linking to them from a slot associated with a DMA channel.
|
|
*
|
|
* Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
|
|
* slots may be allocated on behalf of DSP firmware.
|
|
*
|
|
* Returns the number of the slot, else negative errno.
|
|
*/
|
|
int edma_alloc_slot(unsigned ctlr, int slot)
|
|
{
|
|
if (slot >= 0)
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < 0) {
|
|
slot = edma_cc[ctlr]->num_channels;
|
|
for (;;) {
|
|
slot = find_next_zero_bit(edma_cc[ctlr]->edma_inuse,
|
|
edma_cc[ctlr]->num_slots, slot);
|
|
if (slot == edma_cc[ctlr]->num_slots)
|
|
return -ENOMEM;
|
|
if (!test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse))
|
|
break;
|
|
}
|
|
} else if (slot < edma_cc[ctlr]->num_channels ||
|
|
slot >= edma_cc[ctlr]->num_slots) {
|
|
return -EINVAL;
|
|
} else if (test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse)) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
|
|
&dummy_paramset, PARM_SIZE);
|
|
|
|
return EDMA_CTLR_CHAN(ctlr, slot);
|
|
}
|
|
EXPORT_SYMBOL(edma_alloc_slot);
|
|
|
|
/**
|
|
* edma_free_slot - deallocate DMA parameter RAM
|
|
* @slot: parameter RAM slot returned from edma_alloc_slot()
|
|
*
|
|
* This deallocates the parameter RAM slot allocated by edma_alloc_slot().
|
|
* Callers are responsible for ensuring the slot is inactive, and will
|
|
* not be activated.
|
|
*/
|
|
void edma_free_slot(unsigned slot)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_channels ||
|
|
slot >= edma_cc[ctlr]->num_slots)
|
|
return;
|
|
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
|
|
&dummy_paramset, PARM_SIZE);
|
|
clear_bit(slot, edma_cc[ctlr]->edma_inuse);
|
|
}
|
|
EXPORT_SYMBOL(edma_free_slot);
|
|
|
|
|
|
/**
|
|
* edma_alloc_cont_slots- alloc contiguous parameter RAM slots
|
|
* The API will return the starting point of a set of
|
|
* contiguous parameter RAM slots that have been requested
|
|
*
|
|
* @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
|
|
* or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
|
|
* @count: number of contiguous Paramter RAM slots
|
|
* @slot - the start value of Parameter RAM slot that should be passed if id
|
|
* is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
|
|
*
|
|
* If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
|
|
* contiguous Parameter RAM slots from parameter RAM 64 in the case of
|
|
* DaVinci SOCs and 32 in the case of DA8xx SOCs.
|
|
*
|
|
* If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
|
|
* set of contiguous parameter RAM slots from the "slot" that is passed as an
|
|
* argument to the API.
|
|
*
|
|
* If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
|
|
* starts looking for a set of contiguous parameter RAMs from the "slot"
|
|
* that is passed as an argument to the API. On failure the API will try to
|
|
* find a set of contiguous Parameter RAM slots from the remaining Parameter
|
|
* RAM slots
|
|
*/
|
|
int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
|
|
{
|
|
/*
|
|
* The start slot requested should be greater than
|
|
* the number of channels and lesser than the total number
|
|
* of slots
|
|
*/
|
|
if ((id != EDMA_CONT_PARAMS_ANY) &&
|
|
(slot < edma_cc[ctlr]->num_channels ||
|
|
slot >= edma_cc[ctlr]->num_slots))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The number of parameter RAM slots requested cannot be less than 1
|
|
* and cannot be more than the number of slots minus the number of
|
|
* channels
|
|
*/
|
|
if (count < 1 || count >
|
|
(edma_cc[ctlr]->num_slots - edma_cc[ctlr]->num_channels))
|
|
return -EINVAL;
|
|
|
|
switch (id) {
|
|
case EDMA_CONT_PARAMS_ANY:
|
|
return reserve_contiguous_slots(ctlr, id, count,
|
|
edma_cc[ctlr]->num_channels);
|
|
case EDMA_CONT_PARAMS_FIXED_EXACT:
|
|
case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
|
|
return reserve_contiguous_slots(ctlr, id, count, slot);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
}
|
|
EXPORT_SYMBOL(edma_alloc_cont_slots);
|
|
|
|
/**
|
|
* edma_free_cont_slots - deallocate DMA parameter RAM slots
|
|
* @slot: first parameter RAM of a set of parameter RAM slots to be freed
|
|
* @count: the number of contiguous parameter RAM slots to be freed
|
|
*
|
|
* This deallocates the parameter RAM slots allocated by
|
|
* edma_alloc_cont_slots.
|
|
* Callers/applications need to keep track of sets of contiguous
|
|
* parameter RAM slots that have been allocated using the edma_alloc_cont_slots
|
|
* API.
|
|
* Callers are responsible for ensuring the slots are inactive, and will
|
|
* not be activated.
|
|
*/
|
|
int edma_free_cont_slots(unsigned slot, int count)
|
|
{
|
|
unsigned ctlr, slot_to_free;
|
|
int i;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_channels ||
|
|
slot >= edma_cc[ctlr]->num_slots ||
|
|
count < 1)
|
|
return -EINVAL;
|
|
|
|
for (i = slot; i < slot + count; ++i) {
|
|
ctlr = EDMA_CTLR(i);
|
|
slot_to_free = EDMA_CHAN_SLOT(i);
|
|
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
|
|
&dummy_paramset, PARM_SIZE);
|
|
clear_bit(slot_to_free, edma_cc[ctlr]->edma_inuse);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(edma_free_cont_slots);
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
/* Parameter RAM operations (i) -- read/write partial slots */
|
|
|
|
/**
|
|
* edma_set_src - set initial DMA source address in parameter RAM slot
|
|
* @slot: parameter RAM slot being configured
|
|
* @src_port: physical address of source (memory, controller FIFO, etc)
|
|
* @addressMode: INCR, except in very rare cases
|
|
* @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
|
|
* width to use when addressing the fifo (e.g. W8BIT, W32BIT)
|
|
*
|
|
* Note that the source address is modified during the DMA transfer
|
|
* according to edma_set_src_index().
|
|
*/
|
|
void edma_set_src(unsigned slot, dma_addr_t src_port,
|
|
enum address_mode mode, enum fifo_width width)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_slots) {
|
|
unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
|
|
|
|
if (mode) {
|
|
/* set SAM and program FWID */
|
|
i = (i & ~(EDMA_FWID)) | (SAM | ((width & 0x7) << 8));
|
|
} else {
|
|
/* clear SAM */
|
|
i &= ~SAM;
|
|
}
|
|
edma_parm_write(ctlr, PARM_OPT, slot, i);
|
|
|
|
/* set the source port address
|
|
in source register of param structure */
|
|
edma_parm_write(ctlr, PARM_SRC, slot, src_port);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_set_src);
|
|
|
|
/**
|
|
* edma_set_dest - set initial DMA destination address in parameter RAM slot
|
|
* @slot: parameter RAM slot being configured
|
|
* @dest_port: physical address of destination (memory, controller FIFO, etc)
|
|
* @addressMode: INCR, except in very rare cases
|
|
* @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
|
|
* width to use when addressing the fifo (e.g. W8BIT, W32BIT)
|
|
*
|
|
* Note that the destination address is modified during the DMA transfer
|
|
* according to edma_set_dest_index().
|
|
*/
|
|
void edma_set_dest(unsigned slot, dma_addr_t dest_port,
|
|
enum address_mode mode, enum fifo_width width)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_slots) {
|
|
unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
|
|
|
|
if (mode) {
|
|
/* set DAM and program FWID */
|
|
i = (i & ~(EDMA_FWID)) | (DAM | ((width & 0x7) << 8));
|
|
} else {
|
|
/* clear DAM */
|
|
i &= ~DAM;
|
|
}
|
|
edma_parm_write(ctlr, PARM_OPT, slot, i);
|
|
/* set the destination port address
|
|
in dest register of param structure */
|
|
edma_parm_write(ctlr, PARM_DST, slot, dest_port);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_set_dest);
|
|
|
|
/**
|
|
* edma_get_position - returns the current transfer points
|
|
* @slot: parameter RAM slot being examined
|
|
* @src: pointer to source port position
|
|
* @dst: pointer to destination port position
|
|
*
|
|
* Returns current source and destination addresses for a particular
|
|
* parameter RAM slot. Its channel should not be active when this is called.
|
|
*/
|
|
void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst)
|
|
{
|
|
struct edmacc_param temp;
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
edma_read_slot(EDMA_CTLR_CHAN(ctlr, slot), &temp);
|
|
if (src != NULL)
|
|
*src = temp.src;
|
|
if (dst != NULL)
|
|
*dst = temp.dst;
|
|
}
|
|
EXPORT_SYMBOL(edma_get_position);
|
|
|
|
/**
|
|
* edma_set_src_index - configure DMA source address indexing
|
|
* @slot: parameter RAM slot being configured
|
|
* @src_bidx: byte offset between source arrays in a frame
|
|
* @src_cidx: byte offset between source frames in a block
|
|
*
|
|
* Offsets are specified to support either contiguous or discontiguous
|
|
* memory transfers, or repeated access to a hardware register, as needed.
|
|
* When accessing hardware registers, both offsets are normally zero.
|
|
*/
|
|
void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_slots) {
|
|
edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
|
|
0xffff0000, src_bidx);
|
|
edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
|
|
0xffff0000, src_cidx);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_set_src_index);
|
|
|
|
/**
|
|
* edma_set_dest_index - configure DMA destination address indexing
|
|
* @slot: parameter RAM slot being configured
|
|
* @dest_bidx: byte offset between destination arrays in a frame
|
|
* @dest_cidx: byte offset between destination frames in a block
|
|
*
|
|
* Offsets are specified to support either contiguous or discontiguous
|
|
* memory transfers, or repeated access to a hardware register, as needed.
|
|
* When accessing hardware registers, both offsets are normally zero.
|
|
*/
|
|
void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_slots) {
|
|
edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
|
|
0x0000ffff, dest_bidx << 16);
|
|
edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
|
|
0x0000ffff, dest_cidx << 16);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_set_dest_index);
|
|
|
|
/**
|
|
* edma_set_transfer_params - configure DMA transfer parameters
|
|
* @slot: parameter RAM slot being configured
|
|
* @acnt: how many bytes per array (at least one)
|
|
* @bcnt: how many arrays per frame (at least one)
|
|
* @ccnt: how many frames per block (at least one)
|
|
* @bcnt_rld: used only for A-Synchronized transfers; this specifies
|
|
* the value to reload into bcnt when it decrements to zero
|
|
* @sync_mode: ASYNC or ABSYNC
|
|
*
|
|
* See the EDMA3 documentation to understand how to configure and link
|
|
* transfers using the fields in PaRAM slots. If you are not doing it
|
|
* all at once with edma_write_slot(), you will use this routine
|
|
* plus two calls each for source and destination, setting the initial
|
|
* address and saying how to index that address.
|
|
*
|
|
* An example of an A-Synchronized transfer is a serial link using a
|
|
* single word shift register. In that case, @acnt would be equal to
|
|
* that word size; the serial controller issues a DMA synchronization
|
|
* event to transfer each word, and memory access by the DMA transfer
|
|
* controller will be word-at-a-time.
|
|
*
|
|
* An example of an AB-Synchronized transfer is a device using a FIFO.
|
|
* In that case, @acnt equals the FIFO width and @bcnt equals its depth.
|
|
* The controller with the FIFO issues DMA synchronization events when
|
|
* the FIFO threshold is reached, and the DMA transfer controller will
|
|
* transfer one frame to (or from) the FIFO. It will probably use
|
|
* efficient burst modes to access memory.
|
|
*/
|
|
void edma_set_transfer_params(unsigned slot,
|
|
u16 acnt, u16 bcnt, u16 ccnt,
|
|
u16 bcnt_rld, enum sync_dimension sync_mode)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot < edma_cc[ctlr]->num_slots) {
|
|
edma_parm_modify(ctlr, PARM_LINK_BCNTRLD, slot,
|
|
0x0000ffff, bcnt_rld << 16);
|
|
if (sync_mode == ASYNC)
|
|
edma_parm_and(ctlr, PARM_OPT, slot, ~SYNCDIM);
|
|
else
|
|
edma_parm_or(ctlr, PARM_OPT, slot, SYNCDIM);
|
|
/* Set the acount, bcount, ccount registers */
|
|
edma_parm_write(ctlr, PARM_A_B_CNT, slot, (bcnt << 16) | acnt);
|
|
edma_parm_write(ctlr, PARM_CCNT, slot, ccnt);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_set_transfer_params);
|
|
|
|
/**
|
|
* edma_link - link one parameter RAM slot to another
|
|
* @from: parameter RAM slot originating the link
|
|
* @to: parameter RAM slot which is the link target
|
|
*
|
|
* The originating slot should not be part of any active DMA transfer.
|
|
*/
|
|
void edma_link(unsigned from, unsigned to)
|
|
{
|
|
unsigned ctlr_from, ctlr_to;
|
|
|
|
ctlr_from = EDMA_CTLR(from);
|
|
from = EDMA_CHAN_SLOT(from);
|
|
ctlr_to = EDMA_CTLR(to);
|
|
to = EDMA_CHAN_SLOT(to);
|
|
|
|
if (from >= edma_cc[ctlr_from]->num_slots)
|
|
return;
|
|
if (to >= edma_cc[ctlr_to]->num_slots)
|
|
return;
|
|
edma_parm_modify(ctlr_from, PARM_LINK_BCNTRLD, from, 0xffff0000,
|
|
PARM_OFFSET(to));
|
|
}
|
|
EXPORT_SYMBOL(edma_link);
|
|
|
|
/**
|
|
* edma_unlink - cut link from one parameter RAM slot
|
|
* @from: parameter RAM slot originating the link
|
|
*
|
|
* The originating slot should not be part of any active DMA transfer.
|
|
* Its link is set to 0xffff.
|
|
*/
|
|
void edma_unlink(unsigned from)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(from);
|
|
from = EDMA_CHAN_SLOT(from);
|
|
|
|
if (from >= edma_cc[ctlr]->num_slots)
|
|
return;
|
|
edma_parm_or(ctlr, PARM_LINK_BCNTRLD, from, 0xffff);
|
|
}
|
|
EXPORT_SYMBOL(edma_unlink);
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
/* Parameter RAM operations (ii) -- read/write whole parameter sets */
|
|
|
|
/**
|
|
* edma_write_slot - write parameter RAM data for slot
|
|
* @slot: number of parameter RAM slot being modified
|
|
* @param: data to be written into parameter RAM slot
|
|
*
|
|
* Use this to assign all parameters of a transfer at once. This
|
|
* allows more efficient setup of transfers than issuing multiple
|
|
* calls to set up those parameters in small pieces, and provides
|
|
* complete control over all transfer options.
|
|
*/
|
|
void edma_write_slot(unsigned slot, const struct edmacc_param *param)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot >= edma_cc[ctlr]->num_slots)
|
|
return;
|
|
memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot), param,
|
|
PARM_SIZE);
|
|
}
|
|
EXPORT_SYMBOL(edma_write_slot);
|
|
|
|
/**
|
|
* edma_read_slot - read parameter RAM data from slot
|
|
* @slot: number of parameter RAM slot being copied
|
|
* @param: where to store copy of parameter RAM data
|
|
*
|
|
* Use this to read data from a parameter RAM slot, perhaps to
|
|
* save them as a template for later reuse.
|
|
*/
|
|
void edma_read_slot(unsigned slot, struct edmacc_param *param)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(slot);
|
|
slot = EDMA_CHAN_SLOT(slot);
|
|
|
|
if (slot >= edma_cc[ctlr]->num_slots)
|
|
return;
|
|
memcpy_fromio(param, edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
|
|
PARM_SIZE);
|
|
}
|
|
EXPORT_SYMBOL(edma_read_slot);
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
/* Various EDMA channel control operations */
|
|
|
|
/**
|
|
* edma_pause - pause dma on a channel
|
|
* @channel: on which edma_start() has been called
|
|
*
|
|
* This temporarily disables EDMA hardware events on the specified channel,
|
|
* preventing them from triggering new transfers on its behalf
|
|
*/
|
|
void edma_pause(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel < edma_cc[ctlr]->num_channels) {
|
|
unsigned int mask = (1 << (channel & 0x1f));
|
|
|
|
edma_shadow0_write_array(ctlr, SH_EECR, channel >> 5, mask);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_pause);
|
|
|
|
/**
|
|
* edma_resume - resumes dma on a paused channel
|
|
* @channel: on which edma_pause() has been called
|
|
*
|
|
* This re-enables EDMA hardware events on the specified channel.
|
|
*/
|
|
void edma_resume(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel < edma_cc[ctlr]->num_channels) {
|
|
unsigned int mask = (1 << (channel & 0x1f));
|
|
|
|
edma_shadow0_write_array(ctlr, SH_EESR, channel >> 5, mask);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_resume);
|
|
|
|
/**
|
|
* edma_start - start dma on a channel
|
|
* @channel: channel being activated
|
|
*
|
|
* Channels with event associations will be triggered by their hardware
|
|
* events, and channels without such associations will be triggered by
|
|
* software. (At this writing there is no interface for using software
|
|
* triggers except with channels that don't support hardware triggers.)
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int edma_start(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel < edma_cc[ctlr]->num_channels) {
|
|
int j = channel >> 5;
|
|
unsigned int mask = (1 << (channel & 0x1f));
|
|
|
|
/* EDMA channels without event association */
|
|
if (test_bit(channel, edma_cc[ctlr]->edma_unused)) {
|
|
pr_debug("EDMA: ESR%d %08x\n", j,
|
|
edma_shadow0_read_array(ctlr, SH_ESR, j));
|
|
edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
|
|
return 0;
|
|
}
|
|
|
|
/* EDMA channel with event association */
|
|
pr_debug("EDMA: ER%d %08x\n", j,
|
|
edma_shadow0_read_array(ctlr, SH_ER, j));
|
|
/* Clear any pending event or error */
|
|
edma_write_array(ctlr, EDMA_ECR, j, mask);
|
|
edma_write_array(ctlr, EDMA_EMCR, j, mask);
|
|
/* Clear any SER */
|
|
edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
|
|
edma_shadow0_write_array(ctlr, SH_EESR, j, mask);
|
|
pr_debug("EDMA: EER%d %08x\n", j,
|
|
edma_shadow0_read_array(ctlr, SH_EER, j));
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(edma_start);
|
|
|
|
/**
|
|
* edma_stop - stops dma on the channel passed
|
|
* @channel: channel being deactivated
|
|
*
|
|
* When @lch is a channel, any active transfer is paused and
|
|
* all pending hardware events are cleared. The current transfer
|
|
* may not be resumed, and the channel's Parameter RAM should be
|
|
* reinitialized before being reused.
|
|
*/
|
|
void edma_stop(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel < edma_cc[ctlr]->num_channels) {
|
|
int j = channel >> 5;
|
|
unsigned int mask = (1 << (channel & 0x1f));
|
|
|
|
edma_shadow0_write_array(ctlr, SH_EECR, j, mask);
|
|
edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
|
|
edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
|
|
edma_write_array(ctlr, EDMA_EMCR, j, mask);
|
|
|
|
pr_debug("EDMA: EER%d %08x\n", j,
|
|
edma_shadow0_read_array(ctlr, SH_EER, j));
|
|
|
|
/* REVISIT: consider guarding against inappropriate event
|
|
* chaining by overwriting with dummy_paramset.
|
|
*/
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_stop);
|
|
|
|
/******************************************************************************
|
|
*
|
|
* It cleans ParamEntry qand bring back EDMA to initial state if media has
|
|
* been removed before EDMA has finished.It is usedful for removable media.
|
|
* Arguments:
|
|
* ch_no - channel no
|
|
*
|
|
* Return: zero on success, or corresponding error no on failure
|
|
*
|
|
* FIXME this should not be needed ... edma_stop() should suffice.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
void edma_clean_channel(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel < edma_cc[ctlr]->num_channels) {
|
|
int j = (channel >> 5);
|
|
unsigned int mask = 1 << (channel & 0x1f);
|
|
|
|
pr_debug("EDMA: EMR%d %08x\n", j,
|
|
edma_read_array(ctlr, EDMA_EMR, j));
|
|
edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
|
|
/* Clear the corresponding EMR bits */
|
|
edma_write_array(ctlr, EDMA_EMCR, j, mask);
|
|
/* Clear any SER */
|
|
edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
|
|
edma_write(ctlr, EDMA_CCERRCLR, (1 << 16) | 0x3);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(edma_clean_channel);
|
|
|
|
/*
|
|
* edma_clear_event - clear an outstanding event on the DMA channel
|
|
* Arguments:
|
|
* channel - channel number
|
|
*/
|
|
void edma_clear_event(unsigned channel)
|
|
{
|
|
unsigned ctlr;
|
|
|
|
ctlr = EDMA_CTLR(channel);
|
|
channel = EDMA_CHAN_SLOT(channel);
|
|
|
|
if (channel >= edma_cc[ctlr]->num_channels)
|
|
return;
|
|
if (channel < 32)
|
|
edma_write(ctlr, EDMA_ECR, 1 << channel);
|
|
else
|
|
edma_write(ctlr, EDMA_ECRH, 1 << (channel - 32));
|
|
}
|
|
EXPORT_SYMBOL(edma_clear_event);
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
static int __init edma_probe(struct platform_device *pdev)
|
|
{
|
|
struct edma_soc_info *info = pdev->dev.platform_data;
|
|
const s8 (*queue_priority_mapping)[2];
|
|
const s8 (*queue_tc_mapping)[2];
|
|
int i, j, found = 0;
|
|
int status = -1;
|
|
int irq[EDMA_MAX_CC] = {0, 0};
|
|
int err_irq[EDMA_MAX_CC] = {0, 0};
|
|
struct resource *r[EDMA_MAX_CC] = {NULL};
|
|
resource_size_t len[EDMA_MAX_CC];
|
|
char res_name[10];
|
|
char irq_name[10];
|
|
|
|
if (!info)
|
|
return -ENODEV;
|
|
|
|
for (j = 0; j < EDMA_MAX_CC; j++) {
|
|
sprintf(res_name, "edma_cc%d", j);
|
|
r[j] = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
|
res_name);
|
|
if (!r[j]) {
|
|
if (found)
|
|
break;
|
|
else
|
|
return -ENODEV;
|
|
} else
|
|
found = 1;
|
|
|
|
len[j] = resource_size(r[j]);
|
|
|
|
r[j] = request_mem_region(r[j]->start, len[j],
|
|
dev_name(&pdev->dev));
|
|
if (!r[j]) {
|
|
status = -EBUSY;
|
|
goto fail1;
|
|
}
|
|
|
|
edmacc_regs_base[j] = ioremap(r[j]->start, len[j]);
|
|
if (!edmacc_regs_base[j]) {
|
|
status = -EBUSY;
|
|
goto fail1;
|
|
}
|
|
|
|
edma_cc[j] = kmalloc(sizeof(struct edma), GFP_KERNEL);
|
|
if (!edma_cc[j]) {
|
|
status = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
memset(edma_cc[j], 0, sizeof(struct edma));
|
|
|
|
edma_cc[j]->num_channels = min_t(unsigned, info[j].n_channel,
|
|
EDMA_MAX_DMACH);
|
|
edma_cc[j]->num_slots = min_t(unsigned, info[j].n_slot,
|
|
EDMA_MAX_PARAMENTRY);
|
|
edma_cc[j]->num_cc = min_t(unsigned, info[j].n_cc, EDMA_MAX_CC);
|
|
|
|
edma_cc[j]->default_queue = info[j].default_queue;
|
|
if (!edma_cc[j]->default_queue)
|
|
edma_cc[j]->default_queue = EVENTQ_1;
|
|
|
|
dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
|
|
edmacc_regs_base[j]);
|
|
|
|
for (i = 0; i < edma_cc[j]->num_slots; i++)
|
|
memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
|
|
&dummy_paramset, PARM_SIZE);
|
|
|
|
/* Mark all channels as unused */
|
|
memset(edma_cc[j]->edma_unused, 0xff,
|
|
sizeof(edma_cc[j]->edma_unused));
|
|
|
|
sprintf(irq_name, "edma%d", j);
|
|
irq[j] = platform_get_irq_byname(pdev, irq_name);
|
|
edma_cc[j]->irq_res_start = irq[j];
|
|
status = request_irq(irq[j], dma_irq_handler, 0, "edma",
|
|
&pdev->dev);
|
|
if (status < 0) {
|
|
dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
|
|
irq[j], status);
|
|
goto fail;
|
|
}
|
|
|
|
sprintf(irq_name, "edma%d_err", j);
|
|
err_irq[j] = platform_get_irq_byname(pdev, irq_name);
|
|
edma_cc[j]->irq_res_end = err_irq[j];
|
|
status = request_irq(err_irq[j], dma_ccerr_handler, 0,
|
|
"edma_error", &pdev->dev);
|
|
if (status < 0) {
|
|
dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
|
|
err_irq[j], status);
|
|
goto fail;
|
|
}
|
|
|
|
/* Everything lives on transfer controller 1 until otherwise
|
|
* specified. This way, long transfers on the low priority queue
|
|
* started by the codec engine will not cause audio defects.
|
|
*/
|
|
for (i = 0; i < edma_cc[j]->num_channels; i++)
|
|
map_dmach_queue(j, i, EVENTQ_1);
|
|
|
|
queue_tc_mapping = info[j].queue_tc_mapping;
|
|
queue_priority_mapping = info[j].queue_priority_mapping;
|
|
|
|
/* Event queue to TC mapping */
|
|
for (i = 0; queue_tc_mapping[i][0] != -1; i++)
|
|
map_queue_tc(j, queue_tc_mapping[i][0],
|
|
queue_tc_mapping[i][1]);
|
|
|
|
/* Event queue priority mapping */
|
|
for (i = 0; queue_priority_mapping[i][0] != -1; i++)
|
|
assign_priority_to_queue(j,
|
|
queue_priority_mapping[i][0],
|
|
queue_priority_mapping[i][1]);
|
|
|
|
/* Map the channel to param entry if channel mapping logic
|
|
* exist
|
|
*/
|
|
if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
|
|
map_dmach_param(j);
|
|
|
|
for (i = 0; i < info[j].n_region; i++) {
|
|
edma_write_array2(j, EDMA_DRAE, i, 0, 0x0);
|
|
edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
|
|
edma_write_array(j, EDMA_QRAE, i, 0x0);
|
|
}
|
|
arch_num_cc++;
|
|
}
|
|
|
|
if (tc_errs_handled) {
|
|
status = request_irq(IRQ_TCERRINT0, dma_tc0err_handler, 0,
|
|
"edma_tc0", &pdev->dev);
|
|
if (status < 0) {
|
|
dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
|
|
IRQ_TCERRINT0, status);
|
|
return status;
|
|
}
|
|
status = request_irq(IRQ_TCERRINT, dma_tc1err_handler, 0,
|
|
"edma_tc1", &pdev->dev);
|
|
if (status < 0) {
|
|
dev_dbg(&pdev->dev, "request_irq %d --> %d\n",
|
|
IRQ_TCERRINT, status);
|
|
return status;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
for (i = 0; i < EDMA_MAX_CC; i++) {
|
|
if (err_irq[i])
|
|
free_irq(err_irq[i], &pdev->dev);
|
|
if (irq[i])
|
|
free_irq(irq[i], &pdev->dev);
|
|
}
|
|
fail1:
|
|
for (i = 0; i < EDMA_MAX_CC; i++) {
|
|
if (r[i])
|
|
release_mem_region(r[i]->start, len[i]);
|
|
if (edmacc_regs_base[i])
|
|
iounmap(edmacc_regs_base[i]);
|
|
kfree(edma_cc[i]);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
|
|
static struct platform_driver edma_driver = {
|
|
.driver.name = "edma",
|
|
};
|
|
|
|
static int __init edma_init(void)
|
|
{
|
|
return platform_driver_probe(&edma_driver, edma_probe);
|
|
}
|
|
arch_initcall(edma_init);
|
|
|