dma: add driver for R-Car HPB-DMAC
Add support for HPB-DMAC found in Renesas R-Car SoCs, using 'shdma-base' DMA driver framework. Based on the original patch by Phil Edworthy <phil.edworthy@renesas.com>. Signed-off-by: Max Filippov <max.filippov@cogentembedded.com> [Sergei: removed useless #include, sorted #include's, fixed HPB_DMA_TCR_MAX, fixed formats and removed line breaks in the dev_dbg() calls, rephrased and added IRQ # to the shdma_request_irq() failure message, added MODULE_AUTHOR(), removed '__init'/'__exit' annotations from the probe()/remove() methods, removed '__initdata' annotation from 'hpb_dmae_driver', fixed guard macro name in the header file, fixed #define ASYNCRSTR_ASRST20, added #define ASYNCRSTR_ASRST24, added the necessary runtime PM calls to the probe() and remove() methods, handled errors returned by dma_async_device_register(), beautified comments and #define's.] Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Max Filippov
Vinod Koul
parent
a576b7fe5e
commit
c4f6c41ba7
4 changed files with 765 additions and 0 deletions
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@ -22,3 +22,9 @@ config SUDMAC
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depends on SH_DMAE_BASE
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help
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Enable support for the Renesas SUDMAC controllers.
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config RCAR_HPB_DMAE
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tristate "Renesas R-Car HPB DMAC support"
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depends on SH_DMAE_BASE
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help
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Enable support for the Renesas R-Car series DMA controllers.
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@ -1,3 +1,4 @@
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obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
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obj-$(CONFIG_SH_DMAE) += shdma.o
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obj-$(CONFIG_SUDMAC) += sudmac.o
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obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o
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655
drivers/dma/sh/rcar-hpbdma.c
Normal file
655
drivers/dma/sh/rcar-hpbdma.c
Normal file
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@ -0,0 +1,655 @@
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/*
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* Copyright (C) 2011-2013 Renesas Electronics Corporation
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* Copyright (C) 2013 Cogent Embedded, Inc.
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*
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* This file is based on the drivers/dma/sh/shdma.c
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*
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* Renesas SuperH DMA Engine support
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*
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* This 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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* - DMA of SuperH does not have Hardware DMA chain mode.
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* - max DMA size is 16MB.
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*
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*/
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#include <linux/dmaengine.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_data/dma-rcar-hpbdma.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/shdma-base.h>
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#include <linux/slab.h>
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/* DMA channel registers */
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#define HPB_DMAE_DSAR0 0x00
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#define HPB_DMAE_DDAR0 0x04
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#define HPB_DMAE_DTCR0 0x08
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#define HPB_DMAE_DSAR1 0x0C
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#define HPB_DMAE_DDAR1 0x10
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#define HPB_DMAE_DTCR1 0x14
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#define HPB_DMAE_DSASR 0x18
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#define HPB_DMAE_DDASR 0x1C
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#define HPB_DMAE_DTCSR 0x20
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#define HPB_DMAE_DPTR 0x24
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#define HPB_DMAE_DCR 0x28
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#define HPB_DMAE_DCMDR 0x2C
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#define HPB_DMAE_DSTPR 0x30
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#define HPB_DMAE_DSTSR 0x34
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#define HPB_DMAE_DDBGR 0x38
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#define HPB_DMAE_DDBGR2 0x3C
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#define HPB_DMAE_CHAN(n) (0x40 * (n))
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/* DMA command register (DCMDR) bits */
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#define HPB_DMAE_DCMDR_BDOUT BIT(7)
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#define HPB_DMAE_DCMDR_DQSPD BIT(6)
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#define HPB_DMAE_DCMDR_DQSPC BIT(5)
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#define HPB_DMAE_DCMDR_DMSPD BIT(4)
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#define HPB_DMAE_DCMDR_DMSPC BIT(3)
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#define HPB_DMAE_DCMDR_DQEND BIT(2)
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#define HPB_DMAE_DCMDR_DNXT BIT(1)
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#define HPB_DMAE_DCMDR_DMEN BIT(0)
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/* DMA forced stop register (DSTPR) bits */
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#define HPB_DMAE_DSTPR_DMSTP BIT(0)
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/* DMA status register (DSTSR) bits */
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#define HPB_DMAE_DSTSR_DMSTS BIT(0)
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/* DMA common registers */
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#define HPB_DMAE_DTIMR 0x00
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#define HPB_DMAE_DINTSR0 0x0C
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#define HPB_DMAE_DINTSR1 0x10
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#define HPB_DMAE_DINTCR0 0x14
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#define HPB_DMAE_DINTCR1 0x18
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#define HPB_DMAE_DINTMR0 0x1C
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#define HPB_DMAE_DINTMR1 0x20
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#define HPB_DMAE_DACTSR0 0x24
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#define HPB_DMAE_DACTSR1 0x28
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#define HPB_DMAE_HSRSTR(n) (0x40 + (n) * 4)
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#define HPB_DMAE_HPB_DMASPR(n) (0x140 + (n) * 4)
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#define HPB_DMAE_HPB_DMLVLR0 0x160
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#define HPB_DMAE_HPB_DMLVLR1 0x164
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#define HPB_DMAE_HPB_DMSHPT0 0x168
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#define HPB_DMAE_HPB_DMSHPT1 0x16C
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#define HPB_DMA_SLAVE_NUMBER 256
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#define HPB_DMA_TCR_MAX 0x01000000 /* 16 MiB */
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struct hpb_dmae_chan {
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struct shdma_chan shdma_chan;
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int xfer_mode; /* DMA transfer mode */
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#define XFER_SINGLE 1
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#define XFER_DOUBLE 2
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unsigned plane_idx; /* current DMA information set */
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bool first_desc; /* first/next transfer */
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int xmit_shift; /* log_2(bytes_per_xfer) */
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void __iomem *base;
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const struct hpb_dmae_slave_config *cfg;
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char dev_id[16]; /* unique name per DMAC of channel */
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};
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struct hpb_dmae_device {
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struct shdma_dev shdma_dev;
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spinlock_t reg_lock; /* comm_reg operation lock */
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struct hpb_dmae_pdata *pdata;
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void __iomem *chan_reg;
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void __iomem *comm_reg;
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void __iomem *reset_reg;
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void __iomem *mode_reg;
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};
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struct hpb_dmae_regs {
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u32 sar; /* SAR / source address */
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u32 dar; /* DAR / destination address */
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u32 tcr; /* TCR / transfer count */
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};
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struct hpb_desc {
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struct shdma_desc shdma_desc;
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struct hpb_dmae_regs hw;
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unsigned plane_idx;
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};
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#define to_chan(schan) container_of(schan, struct hpb_dmae_chan, shdma_chan)
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#define to_desc(sdesc) container_of(sdesc, struct hpb_desc, shdma_desc)
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#define to_dev(sc) container_of(sc->shdma_chan.dma_chan.device, \
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struct hpb_dmae_device, shdma_dev.dma_dev)
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static void ch_reg_write(struct hpb_dmae_chan *hpb_dc, u32 data, u32 reg)
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{
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iowrite32(data, hpb_dc->base + reg);
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}
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static u32 ch_reg_read(struct hpb_dmae_chan *hpb_dc, u32 reg)
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{
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return ioread32(hpb_dc->base + reg);
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}
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static void dcmdr_write(struct hpb_dmae_device *hpbdev, u32 data)
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{
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iowrite32(data, hpbdev->chan_reg + HPB_DMAE_DCMDR);
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}
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static void hsrstr_write(struct hpb_dmae_device *hpbdev, u32 ch)
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{
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iowrite32(0x1, hpbdev->comm_reg + HPB_DMAE_HSRSTR(ch));
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}
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static u32 dintsr_read(struct hpb_dmae_device *hpbdev, u32 ch)
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{
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u32 v;
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if (ch < 32)
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v = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTSR0) >> ch;
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else
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v = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTSR1) >> (ch - 32);
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return v & 0x1;
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}
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static void dintcr_write(struct hpb_dmae_device *hpbdev, u32 ch)
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{
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if (ch < 32)
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iowrite32((0x1 << ch), hpbdev->comm_reg + HPB_DMAE_DINTCR0);
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else
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iowrite32((0x1 << (ch - 32)),
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hpbdev->comm_reg + HPB_DMAE_DINTCR1);
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}
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static void asyncmdr_write(struct hpb_dmae_device *hpbdev, u32 data)
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{
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iowrite32(data, hpbdev->mode_reg);
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}
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static u32 asyncmdr_read(struct hpb_dmae_device *hpbdev)
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{
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return ioread32(hpbdev->mode_reg);
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}
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static void hpb_dmae_enable_int(struct hpb_dmae_device *hpbdev, u32 ch)
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{
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u32 intreg;
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spin_lock_irq(&hpbdev->reg_lock);
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if (ch < 32) {
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intreg = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTMR0);
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iowrite32(BIT(ch) | intreg,
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hpbdev->comm_reg + HPB_DMAE_DINTMR0);
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} else {
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intreg = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTMR1);
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iowrite32(BIT(ch - 32) | intreg,
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hpbdev->comm_reg + HPB_DMAE_DINTMR1);
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}
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spin_unlock_irq(&hpbdev->reg_lock);
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}
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static void hpb_dmae_async_reset(struct hpb_dmae_device *hpbdev, u32 data)
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{
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u32 rstr;
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int timeout = 10000; /* 100 ms */
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spin_lock(&hpbdev->reg_lock);
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rstr = ioread32(hpbdev->reset_reg);
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rstr |= data;
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iowrite32(rstr, hpbdev->reset_reg);
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do {
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rstr = ioread32(hpbdev->reset_reg);
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if ((rstr & data) == data)
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break;
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udelay(10);
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} while (timeout--);
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if (timeout < 0)
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dev_err(hpbdev->shdma_dev.dma_dev.dev,
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"%s timeout\n", __func__);
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rstr &= ~data;
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iowrite32(rstr, hpbdev->reset_reg);
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spin_unlock(&hpbdev->reg_lock);
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}
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static void hpb_dmae_set_async_mode(struct hpb_dmae_device *hpbdev,
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u32 mask, u32 data)
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{
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u32 mode;
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spin_lock_irq(&hpbdev->reg_lock);
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mode = asyncmdr_read(hpbdev);
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mode &= ~mask;
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mode |= data;
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asyncmdr_write(hpbdev, mode);
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spin_unlock_irq(&hpbdev->reg_lock);
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}
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static void hpb_dmae_ctl_stop(struct hpb_dmae_device *hpbdev)
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{
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dcmdr_write(hpbdev, HPB_DMAE_DCMDR_DQSPD);
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}
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static void hpb_dmae_reset(struct hpb_dmae_device *hpbdev)
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{
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u32 ch;
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for (ch = 0; ch < hpbdev->pdata->num_hw_channels; ch++)
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hsrstr_write(hpbdev, ch);
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}
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static unsigned int calc_xmit_shift(struct hpb_dmae_chan *hpb_chan)
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{
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struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
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struct hpb_dmae_pdata *pdata = hpbdev->pdata;
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int width = ch_reg_read(hpb_chan, HPB_DMAE_DCR);
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int i;
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switch (width & (HPB_DMAE_DCR_SPDS_MASK | HPB_DMAE_DCR_DPDS_MASK)) {
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case HPB_DMAE_DCR_SPDS_8BIT | HPB_DMAE_DCR_DPDS_8BIT:
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default:
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i = XMIT_SZ_8BIT;
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break;
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case HPB_DMAE_DCR_SPDS_16BIT | HPB_DMAE_DCR_DPDS_16BIT:
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i = XMIT_SZ_16BIT;
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break;
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case HPB_DMAE_DCR_SPDS_32BIT | HPB_DMAE_DCR_DPDS_32BIT:
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i = XMIT_SZ_32BIT;
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break;
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}
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return pdata->ts_shift[i];
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}
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static void hpb_dmae_set_reg(struct hpb_dmae_chan *hpb_chan,
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struct hpb_dmae_regs *hw, unsigned plane)
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{
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ch_reg_write(hpb_chan, hw->sar,
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plane ? HPB_DMAE_DSAR1 : HPB_DMAE_DSAR0);
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ch_reg_write(hpb_chan, hw->dar,
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plane ? HPB_DMAE_DDAR1 : HPB_DMAE_DDAR0);
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ch_reg_write(hpb_chan, hw->tcr >> hpb_chan->xmit_shift,
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plane ? HPB_DMAE_DTCR1 : HPB_DMAE_DTCR0);
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}
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static void hpb_dmae_start(struct hpb_dmae_chan *hpb_chan, bool next)
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{
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ch_reg_write(hpb_chan, (next ? HPB_DMAE_DCMDR_DNXT : 0) |
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HPB_DMAE_DCMDR_DMEN, HPB_DMAE_DCMDR);
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}
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static void hpb_dmae_halt(struct shdma_chan *schan)
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{
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struct hpb_dmae_chan *chan = to_chan(schan);
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ch_reg_write(chan, HPB_DMAE_DCMDR_DQEND, HPB_DMAE_DCMDR);
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ch_reg_write(chan, HPB_DMAE_DSTPR_DMSTP, HPB_DMAE_DSTPR);
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}
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static const struct hpb_dmae_slave_config *
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hpb_dmae_find_slave(struct hpb_dmae_chan *hpb_chan, int slave_id)
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{
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struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
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struct hpb_dmae_pdata *pdata = hpbdev->pdata;
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int i;
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if (slave_id >= HPB_DMA_SLAVE_NUMBER)
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return NULL;
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for (i = 0; i < pdata->num_slaves; i++)
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if (pdata->slaves[i].id == slave_id)
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return pdata->slaves + i;
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return NULL;
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}
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static void hpb_dmae_start_xfer(struct shdma_chan *schan,
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struct shdma_desc *sdesc)
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{
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struct hpb_dmae_chan *chan = to_chan(schan);
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struct hpb_dmae_device *hpbdev = to_dev(chan);
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struct hpb_desc *desc = to_desc(sdesc);
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if (chan->cfg->flags & HPB_DMAE_SET_ASYNC_RESET)
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hpb_dmae_async_reset(hpbdev, chan->cfg->rstr);
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desc->plane_idx = chan->plane_idx;
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hpb_dmae_set_reg(chan, &desc->hw, chan->plane_idx);
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hpb_dmae_start(chan, !chan->first_desc);
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if (chan->xfer_mode == XFER_DOUBLE) {
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chan->plane_idx ^= 1;
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chan->first_desc = false;
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}
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}
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static bool hpb_dmae_desc_completed(struct shdma_chan *schan,
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struct shdma_desc *sdesc)
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{
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/*
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* This is correct since we always have at most single
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* outstanding DMA transfer per channel, and by the time
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* we get completion interrupt the transfer is completed.
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* This will change if we ever use alternating DMA
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* information sets and submit two descriptors at once.
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*/
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return true;
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}
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static bool hpb_dmae_chan_irq(struct shdma_chan *schan, int irq)
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{
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struct hpb_dmae_chan *chan = to_chan(schan);
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struct hpb_dmae_device *hpbdev = to_dev(chan);
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int ch = chan->cfg->dma_ch;
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/* Check Complete DMA Transfer */
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if (dintsr_read(hpbdev, ch)) {
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/* Clear Interrupt status */
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dintcr_write(hpbdev, ch);
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return true;
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}
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return false;
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}
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static int hpb_dmae_desc_setup(struct shdma_chan *schan,
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struct shdma_desc *sdesc,
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dma_addr_t src, dma_addr_t dst, size_t *len)
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{
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struct hpb_desc *desc = to_desc(sdesc);
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if (*len > (size_t)HPB_DMA_TCR_MAX)
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*len = (size_t)HPB_DMA_TCR_MAX;
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desc->hw.sar = src;
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desc->hw.dar = dst;
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desc->hw.tcr = *len;
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return 0;
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}
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static size_t hpb_dmae_get_partial(struct shdma_chan *schan,
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struct shdma_desc *sdesc)
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{
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struct hpb_desc *desc = to_desc(sdesc);
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struct hpb_dmae_chan *chan = to_chan(schan);
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u32 tcr = ch_reg_read(chan, desc->plane_idx ?
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HPB_DMAE_DTCR1 : HPB_DMAE_DTCR0);
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return (desc->hw.tcr - tcr) << chan->xmit_shift;
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}
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static bool hpb_dmae_channel_busy(struct shdma_chan *schan)
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{
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struct hpb_dmae_chan *chan = to_chan(schan);
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u32 dstsr = ch_reg_read(chan, HPB_DMAE_DSTSR);
|
||||
|
||||
return (dstsr & HPB_DMAE_DSTSR_DMSTS) == HPB_DMAE_DSTSR_DMSTS;
|
||||
}
|
||||
|
||||
static int
|
||||
hpb_dmae_alloc_chan_resources(struct hpb_dmae_chan *hpb_chan,
|
||||
const struct hpb_dmae_slave_config *cfg)
|
||||
{
|
||||
struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
|
||||
struct hpb_dmae_pdata *pdata = hpbdev->pdata;
|
||||
const struct hpb_dmae_channel *channel = pdata->channels;
|
||||
int slave_id = cfg->id;
|
||||
int i, err;
|
||||
|
||||
for (i = 0; i < pdata->num_channels; i++, channel++) {
|
||||
if (channel->s_id == slave_id) {
|
||||
struct device *dev = hpb_chan->shdma_chan.dev;
|
||||
|
||||
hpb_chan->base = hpbdev->chan_reg +
|
||||
HPB_DMAE_CHAN(cfg->dma_ch);
|
||||
|
||||
dev_dbg(dev, "Detected Slave device\n");
|
||||
dev_dbg(dev, " -- slave_id : 0x%x\n", slave_id);
|
||||
dev_dbg(dev, " -- cfg->dma_ch : %d\n", cfg->dma_ch);
|
||||
dev_dbg(dev, " -- channel->ch_irq: %d\n",
|
||||
channel->ch_irq);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
err = shdma_request_irq(&hpb_chan->shdma_chan, channel->ch_irq,
|
||||
IRQF_SHARED, hpb_chan->dev_id);
|
||||
if (err) {
|
||||
dev_err(hpb_chan->shdma_chan.dev,
|
||||
"DMA channel request_irq %d failed with error %d\n",
|
||||
channel->ch_irq, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
hpb_chan->plane_idx = 0;
|
||||
hpb_chan->first_desc = true;
|
||||
|
||||
if ((cfg->dcr & (HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) == 0) {
|
||||
hpb_chan->xfer_mode = XFER_SINGLE;
|
||||
} else if ((cfg->dcr & (HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) ==
|
||||
(HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) {
|
||||
hpb_chan->xfer_mode = XFER_DOUBLE;
|
||||
} else {
|
||||
dev_err(hpb_chan->shdma_chan.dev, "DCR setting error");
|
||||
shdma_free_irq(&hpb_chan->shdma_chan);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (cfg->flags & HPB_DMAE_SET_ASYNC_MODE)
|
||||
hpb_dmae_set_async_mode(hpbdev, cfg->mdm, cfg->mdr);
|
||||
ch_reg_write(hpb_chan, cfg->dcr, HPB_DMAE_DCR);
|
||||
ch_reg_write(hpb_chan, cfg->port, HPB_DMAE_DPTR);
|
||||
hpb_chan->xmit_shift = calc_xmit_shift(hpb_chan);
|
||||
hpb_dmae_enable_int(hpbdev, cfg->dma_ch);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hpb_dmae_set_slave(struct shdma_chan *schan, int slave_id, bool try)
|
||||
{
|
||||
struct hpb_dmae_chan *chan = to_chan(schan);
|
||||
const struct hpb_dmae_slave_config *sc =
|
||||
hpb_dmae_find_slave(chan, slave_id);
|
||||
|
||||
if (!sc)
|
||||
return -ENODEV;
|
||||
if (try)
|
||||
return 0;
|
||||
chan->cfg = sc;
|
||||
return hpb_dmae_alloc_chan_resources(chan, sc);
|
||||
}
|
||||
|
||||
static void hpb_dmae_setup_xfer(struct shdma_chan *schan, int slave_id)
|
||||
{
|
||||
}
|
||||
|
||||
static dma_addr_t hpb_dmae_slave_addr(struct shdma_chan *schan)
|
||||
{
|
||||
struct hpb_dmae_chan *chan = to_chan(schan);
|
||||
|
||||
return chan->cfg->addr;
|
||||
}
|
||||
|
||||
static struct shdma_desc *hpb_dmae_embedded_desc(void *buf, int i)
|
||||
{
|
||||
return &((struct hpb_desc *)buf)[i].shdma_desc;
|
||||
}
|
||||
|
||||
static const struct shdma_ops hpb_dmae_ops = {
|
||||
.desc_completed = hpb_dmae_desc_completed,
|
||||
.halt_channel = hpb_dmae_halt,
|
||||
.channel_busy = hpb_dmae_channel_busy,
|
||||
.slave_addr = hpb_dmae_slave_addr,
|
||||
.desc_setup = hpb_dmae_desc_setup,
|
||||
.set_slave = hpb_dmae_set_slave,
|
||||
.setup_xfer = hpb_dmae_setup_xfer,
|
||||
.start_xfer = hpb_dmae_start_xfer,
|
||||
.embedded_desc = hpb_dmae_embedded_desc,
|
||||
.chan_irq = hpb_dmae_chan_irq,
|
||||
.get_partial = hpb_dmae_get_partial,
|
||||
};
|
||||
|
||||
static int hpb_dmae_chan_probe(struct hpb_dmae_device *hpbdev, int id)
|
||||
{
|
||||
struct shdma_dev *sdev = &hpbdev->shdma_dev;
|
||||
struct platform_device *pdev =
|
||||
to_platform_device(hpbdev->shdma_dev.dma_dev.dev);
|
||||
struct hpb_dmae_chan *new_hpb_chan;
|
||||
struct shdma_chan *schan;
|
||||
|
||||
/* Alloc channel */
|
||||
new_hpb_chan = devm_kzalloc(&pdev->dev,
|
||||
sizeof(struct hpb_dmae_chan), GFP_KERNEL);
|
||||
if (!new_hpb_chan) {
|
||||
dev_err(hpbdev->shdma_dev.dma_dev.dev,
|
||||
"No free memory for allocating DMA channels!\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
schan = &new_hpb_chan->shdma_chan;
|
||||
shdma_chan_probe(sdev, schan, id);
|
||||
|
||||
if (pdev->id >= 0)
|
||||
snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id),
|
||||
"hpb-dmae%d.%d", pdev->id, id);
|
||||
else
|
||||
snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id),
|
||||
"hpb-dma.%d", id);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hpb_dmae_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct hpb_dmae_pdata *pdata = pdev->dev.platform_data;
|
||||
struct hpb_dmae_device *hpbdev;
|
||||
struct dma_device *dma_dev;
|
||||
struct resource *chan, *comm, *rest, *mode, *irq_res;
|
||||
int err, i;
|
||||
|
||||
/* Get platform data */
|
||||
if (!pdata || !pdata->num_channels)
|
||||
return -ENODEV;
|
||||
|
||||
chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
comm = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
rest = platform_get_resource(pdev, IORESOURCE_MEM, 2);
|
||||
mode = platform_get_resource(pdev, IORESOURCE_MEM, 3);
|
||||
|
||||
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
||||
if (!irq_res)
|
||||
return -ENODEV;
|
||||
|
||||
hpbdev = devm_kzalloc(&pdev->dev, sizeof(struct hpb_dmae_device),
|
||||
GFP_KERNEL);
|
||||
if (!hpbdev) {
|
||||
dev_err(&pdev->dev, "Not enough memory\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
hpbdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
|
||||
if (IS_ERR(hpbdev->chan_reg))
|
||||
return PTR_ERR(hpbdev->chan_reg);
|
||||
|
||||
hpbdev->comm_reg = devm_ioremap_resource(&pdev->dev, comm);
|
||||
if (IS_ERR(hpbdev->comm_reg))
|
||||
return PTR_ERR(hpbdev->comm_reg);
|
||||
|
||||
hpbdev->reset_reg = devm_ioremap_resource(&pdev->dev, rest);
|
||||
if (IS_ERR(hpbdev->reset_reg))
|
||||
return PTR_ERR(hpbdev->reset_reg);
|
||||
|
||||
hpbdev->mode_reg = devm_ioremap_resource(&pdev->dev, mode);
|
||||
if (IS_ERR(hpbdev->mode_reg))
|
||||
return PTR_ERR(hpbdev->mode_reg);
|
||||
|
||||
dma_dev = &hpbdev->shdma_dev.dma_dev;
|
||||
|
||||
spin_lock_init(&hpbdev->reg_lock);
|
||||
|
||||
/* Platform data */
|
||||
hpbdev->pdata = pdata;
|
||||
|
||||
pm_runtime_enable(&pdev->dev);
|
||||
err = pm_runtime_get_sync(&pdev->dev);
|
||||
if (err < 0)
|
||||
dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
|
||||
|
||||
/* Reset DMA controller */
|
||||
hpb_dmae_reset(hpbdev);
|
||||
|
||||
pm_runtime_put(&pdev->dev);
|
||||
|
||||
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
|
||||
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
|
||||
|
||||
hpbdev->shdma_dev.ops = &hpb_dmae_ops;
|
||||
hpbdev->shdma_dev.desc_size = sizeof(struct hpb_desc);
|
||||
err = shdma_init(&pdev->dev, &hpbdev->shdma_dev, pdata->num_channels);
|
||||
if (err < 0)
|
||||
goto error;
|
||||
|
||||
/* Create DMA channels */
|
||||
for (i = 0; i < pdata->num_channels; i++)
|
||||
hpb_dmae_chan_probe(hpbdev, i);
|
||||
|
||||
platform_set_drvdata(pdev, hpbdev);
|
||||
err = dma_async_device_register(dma_dev);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
shdma_cleanup(&hpbdev->shdma_dev);
|
||||
error:
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void hpb_dmae_chan_remove(struct hpb_dmae_device *hpbdev)
|
||||
{
|
||||
struct dma_device *dma_dev = &hpbdev->shdma_dev.dma_dev;
|
||||
struct shdma_chan *schan;
|
||||
int i;
|
||||
|
||||
shdma_for_each_chan(schan, &hpbdev->shdma_dev, i) {
|
||||
BUG_ON(!schan);
|
||||
|
||||
shdma_free_irq(schan);
|
||||
shdma_chan_remove(schan);
|
||||
}
|
||||
dma_dev->chancnt = 0;
|
||||
}
|
||||
|
||||
static int hpb_dmae_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev);
|
||||
|
||||
dma_async_device_unregister(&hpbdev->shdma_dev.dma_dev);
|
||||
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
|
||||
hpb_dmae_chan_remove(hpbdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void hpb_dmae_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev);
|
||||
hpb_dmae_ctl_stop(hpbdev);
|
||||
}
|
||||
|
||||
static struct platform_driver hpb_dmae_driver = {
|
||||
.probe = hpb_dmae_probe,
|
||||
.remove = hpb_dmae_remove,
|
||||
.shutdown = hpb_dmae_shutdown,
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "hpb-dma-engine",
|
||||
},
|
||||
};
|
||||
module_platform_driver(hpb_dmae_driver);
|
||||
|
||||
MODULE_AUTHOR("Max Filippov <max.filippov@cogentembedded.com>");
|
||||
MODULE_DESCRIPTION("Renesas HPB DMA Engine driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
103
include/linux/platform_data/dma-rcar-hpbdma.h
Normal file
103
include/linux/platform_data/dma-rcar-hpbdma.h
Normal file
|
|
@ -0,0 +1,103 @@
|
|||
/*
|
||||
* Copyright (C) 2011-2013 Renesas Electronics Corporation
|
||||
* Copyright (C) 2013 Cogent Embedded, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2
|
||||
* as published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __DMA_RCAR_HPBDMA_H
|
||||
#define __DMA_RCAR_HPBDMA_H
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
/* Transmit sizes and respective register values */
|
||||
enum {
|
||||
XMIT_SZ_8BIT = 0,
|
||||
XMIT_SZ_16BIT = 1,
|
||||
XMIT_SZ_32BIT = 2,
|
||||
XMIT_SZ_MAX
|
||||
};
|
||||
|
||||
/* DMA control register (DCR) bits */
|
||||
#define HPB_DMAE_DCR_DTAMD (1u << 26)
|
||||
#define HPB_DMAE_DCR_DTAC (1u << 25)
|
||||
#define HPB_DMAE_DCR_DTAU (1u << 24)
|
||||
#define HPB_DMAE_DCR_DTAU1 (1u << 23)
|
||||
#define HPB_DMAE_DCR_SWMD (1u << 22)
|
||||
#define HPB_DMAE_DCR_BTMD (1u << 21)
|
||||
#define HPB_DMAE_DCR_PKMD (1u << 20)
|
||||
#define HPB_DMAE_DCR_CT (1u << 18)
|
||||
#define HPB_DMAE_DCR_ACMD (1u << 17)
|
||||
#define HPB_DMAE_DCR_DIP (1u << 16)
|
||||
#define HPB_DMAE_DCR_SMDL (1u << 13)
|
||||
#define HPB_DMAE_DCR_SPDAM (1u << 12)
|
||||
#define HPB_DMAE_DCR_SDRMD_MASK (3u << 10)
|
||||
#define HPB_DMAE_DCR_SDRMD_MOD (0u << 10)
|
||||
#define HPB_DMAE_DCR_SDRMD_AUTO (1u << 10)
|
||||
#define HPB_DMAE_DCR_SDRMD_TIMER (2u << 10)
|
||||
#define HPB_DMAE_DCR_SPDS_MASK (3u << 8)
|
||||
#define HPB_DMAE_DCR_SPDS_8BIT (0u << 8)
|
||||
#define HPB_DMAE_DCR_SPDS_16BIT (1u << 8)
|
||||
#define HPB_DMAE_DCR_SPDS_32BIT (2u << 8)
|
||||
#define HPB_DMAE_DCR_DMDL (1u << 5)
|
||||
#define HPB_DMAE_DCR_DPDAM (1u << 4)
|
||||
#define HPB_DMAE_DCR_DDRMD_MASK (3u << 2)
|
||||
#define HPB_DMAE_DCR_DDRMD_MOD (0u << 2)
|
||||
#define HPB_DMAE_DCR_DDRMD_AUTO (1u << 2)
|
||||
#define HPB_DMAE_DCR_DDRMD_TIMER (2u << 2)
|
||||
#define HPB_DMAE_DCR_DPDS_MASK (3u << 0)
|
||||
#define HPB_DMAE_DCR_DPDS_8BIT (0u << 0)
|
||||
#define HPB_DMAE_DCR_DPDS_16BIT (1u << 0)
|
||||
#define HPB_DMAE_DCR_DPDS_32BIT (2u << 0)
|
||||
|
||||
/* Asynchronous reset register (ASYNCRSTR) bits */
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST41 BIT(10)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST40 BIT(9)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST39 BIT(8)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST27 BIT(7)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST26 BIT(6)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST25 BIT(5)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST24 BIT(4)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST23 BIT(3)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST22 BIT(2)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST21 BIT(1)
|
||||
#define HPB_DMAE_ASYNCRSTR_ASRST20 BIT(0)
|
||||
|
||||
struct hpb_dmae_slave_config {
|
||||
unsigned int id;
|
||||
dma_addr_t addr;
|
||||
u32 dcr;
|
||||
u32 port;
|
||||
u32 rstr;
|
||||
u32 mdr;
|
||||
u32 mdm;
|
||||
u32 flags;
|
||||
#define HPB_DMAE_SET_ASYNC_RESET BIT(0)
|
||||
#define HPB_DMAE_SET_ASYNC_MODE BIT(1)
|
||||
u32 dma_ch;
|
||||
};
|
||||
|
||||
#define HPB_DMAE_CHANNEL(_irq, _s_id) \
|
||||
{ \
|
||||
.ch_irq = _irq, \
|
||||
.s_id = _s_id, \
|
||||
}
|
||||
|
||||
struct hpb_dmae_channel {
|
||||
unsigned int ch_irq;
|
||||
unsigned int s_id;
|
||||
};
|
||||
|
||||
struct hpb_dmae_pdata {
|
||||
const struct hpb_dmae_slave_config *slaves;
|
||||
int num_slaves;
|
||||
const struct hpb_dmae_channel *channels;
|
||||
int num_channels;
|
||||
const unsigned int ts_shift[XMIT_SZ_MAX];
|
||||
int num_hw_channels;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue