/* * This is for Renesas R-Car Audio-DMAC-peri-peri. * * Copyright (C) 2014 Renesas Electronics Corporation * Copyright (C) 2014 Kuninori Morimoto * * based on the drivers/dma/sh/shdma.c * * Copyright (C) 2011-2012 Guennadi Liakhovetski * Copyright (C) 2009 Nobuhiro Iwamatsu * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include #include #include /* * DMA register */ #define PDMASAR 0x00 #define PDMADAR 0x04 #define PDMACHCR 0x0c /* PDMACHCR */ #define PDMACHCR_DE (1 << 0) #define AUDMAPP_MAX_CHANNELS 29 /* Default MEMCPY transfer size = 2^2 = 4 bytes */ #define LOG2_DEFAULT_XFER_SIZE 2 #define AUDMAPP_SLAVE_NUMBER 256 #define AUDMAPP_LEN_MAX (16 * 1024 * 1024) struct audmapp_chan { struct shdma_chan shdma_chan; struct audmapp_slave_config *config; void __iomem *base; }; struct audmapp_device { struct shdma_dev shdma_dev; struct audmapp_pdata *pdata; struct device *dev; void __iomem *chan_reg; }; #define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan) #define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \ struct audmapp_device, shdma_dev.dma_dev) static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg) { struct audmapp_device *audev = to_dev(auchan); struct device *dev = audev->dev; dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data); iowrite32(data, auchan->base + reg); } static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg) { return ioread32(auchan->base + reg); } static void audmapp_halt(struct shdma_chan *schan) { struct audmapp_chan *auchan = to_chan(schan); int i; audmapp_write(auchan, 0, PDMACHCR); for (i = 0; i < 1024; i++) { if (0 == audmapp_read(auchan, PDMACHCR)) return; udelay(1); } } static void audmapp_start_xfer(struct shdma_chan *schan, struct shdma_desc *sdecs) { struct audmapp_chan *auchan = to_chan(schan); struct audmapp_device *audev = to_dev(auchan); struct audmapp_slave_config *cfg = auchan->config; struct device *dev = audev->dev; u32 chcr = cfg->chcr | PDMACHCR_DE; dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n", &cfg->src, &cfg->dst, cfg->chcr); audmapp_write(auchan, cfg->src, PDMASAR); audmapp_write(auchan, cfg->dst, PDMADAR); audmapp_write(auchan, chcr, PDMACHCR); } static struct audmapp_slave_config * audmapp_find_slave(struct audmapp_chan *auchan, int slave_id) { struct audmapp_device *audev = to_dev(auchan); struct audmapp_pdata *pdata = audev->pdata; struct audmapp_slave_config *cfg; int i; if (slave_id >= AUDMAPP_SLAVE_NUMBER) return NULL; for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) if (cfg->slave_id == slave_id) return cfg; return NULL; } static int audmapp_set_slave(struct shdma_chan *schan, int slave_id, dma_addr_t slave_addr, bool try) { struct audmapp_chan *auchan = to_chan(schan); struct audmapp_slave_config *cfg = audmapp_find_slave(auchan, slave_id); if (!cfg) return -ENODEV; if (try) return 0; auchan->config = cfg; return 0; } static int audmapp_desc_setup(struct shdma_chan *schan, struct shdma_desc *sdecs, dma_addr_t src, dma_addr_t dst, size_t *len) { struct audmapp_chan *auchan = to_chan(schan); struct audmapp_slave_config *cfg = auchan->config; if (!cfg) return -ENODEV; if (*len > (size_t)AUDMAPP_LEN_MAX) *len = (size_t)AUDMAPP_LEN_MAX; return 0; } static void audmapp_setup_xfer(struct shdma_chan *schan, int slave_id) { } static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan) { return 0; /* always fixed address */ } static bool audmapp_channel_busy(struct shdma_chan *schan) { struct audmapp_chan *auchan = to_chan(schan); u32 chcr = audmapp_read(auchan, PDMACHCR); return chcr & ~PDMACHCR_DE; } static bool audmapp_desc_completed(struct shdma_chan *schan, struct shdma_desc *sdesc) { return true; } static struct shdma_desc *audmapp_embedded_desc(void *buf, int i) { return &((struct shdma_desc *)buf)[i]; } static const struct shdma_ops audmapp_shdma_ops = { .halt_channel = audmapp_halt, .desc_setup = audmapp_desc_setup, .set_slave = audmapp_set_slave, .start_xfer = audmapp_start_xfer, .embedded_desc = audmapp_embedded_desc, .setup_xfer = audmapp_setup_xfer, .slave_addr = audmapp_slave_addr, .channel_busy = audmapp_channel_busy, .desc_completed = audmapp_desc_completed, }; static int audmapp_chan_probe(struct platform_device *pdev, struct audmapp_device *audev, int id) { struct shdma_dev *sdev = &audev->shdma_dev; struct audmapp_chan *auchan; struct shdma_chan *schan; struct device *dev = audev->dev; auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL); if (!auchan) return -ENOMEM; schan = &auchan->shdma_chan; schan->max_xfer_len = AUDMAPP_LEN_MAX; shdma_chan_probe(sdev, schan, id); auchan->base = audev->chan_reg + 0x20 + (0x10 * id); dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg); return 0; } static void audmapp_chan_remove(struct audmapp_device *audev) { struct dma_device *dma_dev = &audev->shdma_dev.dma_dev; struct shdma_chan *schan; int i; shdma_for_each_chan(schan, &audev->shdma_dev, i) { BUG_ON(!schan); shdma_chan_remove(schan); } dma_dev->chancnt = 0; } static int audmapp_probe(struct platform_device *pdev) { struct audmapp_pdata *pdata = pdev->dev.platform_data; struct audmapp_device *audev; struct shdma_dev *sdev; struct dma_device *dma_dev; struct resource *res; int err, i; if (!pdata) return -ENODEV; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL); if (!audev) return -ENOMEM; audev->dev = &pdev->dev; audev->pdata = pdata; audev->chan_reg = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(audev->chan_reg)) return PTR_ERR(audev->chan_reg); sdev = &audev->shdma_dev; sdev->ops = &audmapp_shdma_ops; sdev->desc_size = sizeof(struct shdma_desc); dma_dev = &sdev->dma_dev; dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS); if (err < 0) return err; platform_set_drvdata(pdev, audev); /* Create DMA Channel */ for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) { err = audmapp_chan_probe(pdev, audev, i); if (err) goto chan_probe_err; } err = dma_async_device_register(dma_dev); if (err < 0) goto chan_probe_err; return err; chan_probe_err: audmapp_chan_remove(audev); shdma_cleanup(sdev); return err; } static int audmapp_remove(struct platform_device *pdev) { struct audmapp_device *audev = platform_get_drvdata(pdev); struct dma_device *dma_dev = &audev->shdma_dev.dma_dev; dma_async_device_unregister(dma_dev); audmapp_chan_remove(audev); shdma_cleanup(&audev->shdma_dev); return 0; } static struct platform_driver audmapp_driver = { .probe = audmapp_probe, .remove = audmapp_remove, .driver = { .owner = THIS_MODULE, .name = "rcar-audmapp-engine", }, }; module_platform_driver(audmapp_driver); MODULE_AUTHOR("Kuninori Morimoto "); MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver"); MODULE_LICENSE("GPL");