diff options
Diffstat (limited to 'drivers/dma/sh/sudmac.c')
| -rw-r--r-- | drivers/dma/sh/sudmac.c | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/drivers/dma/sh/sudmac.c b/drivers/dma/sh/sudmac.c deleted file mode 100644 index 30cc3553cb8b..000000000000 --- a/drivers/dma/sh/sudmac.c +++ /dev/null @@ -1,414 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Renesas SUDMAC support - * - * Copyright (C) 2013 Renesas Solutions Corp. - * - * based on drivers/dma/sh/shdma.c: - * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> - * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> - * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. - * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. - */ - -#include <linux/dmaengine.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/sudmac.h> - -struct sudmac_chan { - struct shdma_chan shdma_chan; - void __iomem *base; - char dev_id[16]; /* unique name per DMAC of channel */ - - u32 offset; /* for CFG, BA, BBC, CA, CBC, DEN */ - u32 cfg; - u32 dint_end_bit; -}; - -struct sudmac_device { - struct shdma_dev shdma_dev; - struct sudmac_pdata *pdata; - void __iomem *chan_reg; -}; - -struct sudmac_regs { - u32 base_addr; - u32 base_byte_count; -}; - -struct sudmac_desc { - struct sudmac_regs hw; - struct shdma_desc shdma_desc; -}; - -#define to_chan(schan) container_of(schan, struct sudmac_chan, shdma_chan) -#define to_desc(sdesc) container_of(sdesc, struct sudmac_desc, shdma_desc) -#define to_sdev(sc) container_of(sc->shdma_chan.dma_chan.device, \ - struct sudmac_device, shdma_dev.dma_dev) - -/* SUDMAC register */ -#define SUDMAC_CH0CFG 0x00 -#define SUDMAC_CH0BA 0x10 -#define SUDMAC_CH0BBC 0x18 -#define SUDMAC_CH0CA 0x20 -#define SUDMAC_CH0CBC 0x28 -#define SUDMAC_CH0DEN 0x30 -#define SUDMAC_DSTSCLR 0x38 -#define SUDMAC_DBUFCTRL 0x3C -#define SUDMAC_DINTCTRL 0x40 -#define SUDMAC_DINTSTS 0x44 -#define SUDMAC_DINTSTSCLR 0x48 -#define SUDMAC_CH0SHCTRL 0x50 - -/* Definitions for the sudmac_channel.config */ -#define SUDMAC_SENDBUFM 0x1000 /* b12: Transmit Buffer Mode */ -#define SUDMAC_RCVENDM 0x0100 /* b8: Receive Data Transfer End Mode */ -#define SUDMAC_LBA_WAIT 0x0030 /* b5-4: Local Bus Access Wait */ - -/* Definitions for the sudmac_channel.dint_end_bit */ -#define SUDMAC_CH1ENDE 0x0002 /* b1: Ch1 DMA Transfer End Int Enable */ -#define SUDMAC_CH0ENDE 0x0001 /* b0: Ch0 DMA Transfer End Int Enable */ - -#define SUDMAC_DRV_NAME "sudmac" - -static void sudmac_writel(struct sudmac_chan *sc, u32 data, u32 reg) -{ - iowrite32(data, sc->base + reg); -} - -static u32 sudmac_readl(struct sudmac_chan *sc, u32 reg) -{ - return ioread32(sc->base + reg); -} - -static bool sudmac_is_busy(struct sudmac_chan *sc) -{ - u32 den = sudmac_readl(sc, SUDMAC_CH0DEN + sc->offset); - - if (den) - return true; /* working */ - - return false; /* waiting */ -} - -static void sudmac_set_reg(struct sudmac_chan *sc, struct sudmac_regs *hw, - struct shdma_desc *sdesc) -{ - sudmac_writel(sc, sc->cfg, SUDMAC_CH0CFG + sc->offset); - sudmac_writel(sc, hw->base_addr, SUDMAC_CH0BA + sc->offset); - sudmac_writel(sc, hw->base_byte_count, SUDMAC_CH0BBC + sc->offset); -} - -static void sudmac_start(struct sudmac_chan *sc) -{ - u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL); - - sudmac_writel(sc, dintctrl | sc->dint_end_bit, SUDMAC_DINTCTRL); - sudmac_writel(sc, 1, SUDMAC_CH0DEN + sc->offset); -} - -static void sudmac_start_xfer(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sudmac_chan *sc = to_chan(schan); - struct sudmac_desc *sd = to_desc(sdesc); - - sudmac_set_reg(sc, &sd->hw, sdesc); - sudmac_start(sc); -} - -static bool sudmac_channel_busy(struct shdma_chan *schan) -{ - struct sudmac_chan *sc = to_chan(schan); - - return sudmac_is_busy(sc); -} - -static void sudmac_setup_xfer(struct shdma_chan *schan, int slave_id) -{ -} - -static const struct sudmac_slave_config *sudmac_find_slave( - struct sudmac_chan *sc, int slave_id) -{ - struct sudmac_device *sdev = to_sdev(sc); - struct sudmac_pdata *pdata = sdev->pdata; - const struct sudmac_slave_config *cfg; - int i; - - for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) - if (cfg->slave_id == slave_id) - return cfg; - - return NULL; -} - -static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, - dma_addr_t slave_addr, bool try) -{ - struct sudmac_chan *sc = to_chan(schan); - const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id); - - if (!cfg) - return -ENODEV; - - return 0; -} - -static inline void sudmac_dma_halt(struct sudmac_chan *sc) -{ - u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL); - - sudmac_writel(sc, 0, SUDMAC_CH0DEN + sc->offset); - sudmac_writel(sc, dintctrl & ~sc->dint_end_bit, SUDMAC_DINTCTRL); - sudmac_writel(sc, sc->dint_end_bit, SUDMAC_DINTSTSCLR); -} - -static int sudmac_desc_setup(struct shdma_chan *schan, - struct shdma_desc *sdesc, - dma_addr_t src, dma_addr_t dst, size_t *len) -{ - struct sudmac_chan *sc = to_chan(schan); - struct sudmac_desc *sd = to_desc(sdesc); - - dev_dbg(sc->shdma_chan.dev, "%s: src=%pad, dst=%pad, len=%zu\n", - __func__, &src, &dst, *len); - - if (*len > schan->max_xfer_len) - *len = schan->max_xfer_len; - - if (dst) - sd->hw.base_addr = dst; - else if (src) - sd->hw.base_addr = src; - sd->hw.base_byte_count = *len; - - return 0; -} - -static void sudmac_halt(struct shdma_chan *schan) -{ - struct sudmac_chan *sc = to_chan(schan); - - sudmac_dma_halt(sc); -} - -static bool sudmac_chan_irq(struct shdma_chan *schan, int irq) -{ - struct sudmac_chan *sc = to_chan(schan); - u32 dintsts = sudmac_readl(sc, SUDMAC_DINTSTS); - - if (!(dintsts & sc->dint_end_bit)) - return false; - - /* DMA stop */ - sudmac_dma_halt(sc); - - return true; -} - -static size_t sudmac_get_partial(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sudmac_chan *sc = to_chan(schan); - struct sudmac_desc *sd = to_desc(sdesc); - u32 current_byte_count = sudmac_readl(sc, SUDMAC_CH0CBC + sc->offset); - - return sd->hw.base_byte_count - current_byte_count; -} - -static bool sudmac_desc_completed(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sudmac_chan *sc = to_chan(schan); - struct sudmac_desc *sd = to_desc(sdesc); - u32 current_addr = sudmac_readl(sc, SUDMAC_CH0CA + sc->offset); - - return sd->hw.base_addr + sd->hw.base_byte_count == current_addr; -} - -static int sudmac_chan_probe(struct sudmac_device *su_dev, int id, int irq, - unsigned long flags) -{ - struct shdma_dev *sdev = &su_dev->shdma_dev; - struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); - struct sudmac_chan *sc; - struct shdma_chan *schan; - int err; - - sc = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_chan), GFP_KERNEL); - if (!sc) - return -ENOMEM; - - schan = &sc->shdma_chan; - schan->max_xfer_len = 64 * 1024 * 1024 - 1; - - shdma_chan_probe(sdev, schan, id); - - sc->base = su_dev->chan_reg; - - /* get platform_data */ - sc->offset = su_dev->pdata->channel->offset; - if (su_dev->pdata->channel->config & SUDMAC_TX_BUFFER_MODE) - sc->cfg |= SUDMAC_SENDBUFM; - if (su_dev->pdata->channel->config & SUDMAC_RX_END_MODE) - sc->cfg |= SUDMAC_RCVENDM; - sc->cfg |= (su_dev->pdata->channel->wait << 4) & SUDMAC_LBA_WAIT; - - if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH0) - sc->dint_end_bit |= SUDMAC_CH0ENDE; - if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH1) - sc->dint_end_bit |= SUDMAC_CH1ENDE; - - /* set up channel irq */ - if (pdev->id >= 0) - snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d.%d", - pdev->id, id); - else - snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d", id); - - err = shdma_request_irq(schan, irq, flags, sc->dev_id); - if (err) { - dev_err(sdev->dma_dev.dev, - "DMA channel %d request_irq failed %d\n", id, err); - goto err_no_irq; - } - - return 0; - -err_no_irq: - /* remove from dmaengine device node */ - shdma_chan_remove(schan); - return err; -} - -static void sudmac_chan_remove(struct sudmac_device *su_dev) -{ - struct shdma_chan *schan; - int i; - - shdma_for_each_chan(schan, &su_dev->shdma_dev, i) { - BUG_ON(!schan); - - shdma_chan_remove(schan); - } -} - -static dma_addr_t sudmac_slave_addr(struct shdma_chan *schan) -{ - /* SUDMAC doesn't need the address */ - return 0; -} - -static struct shdma_desc *sudmac_embedded_desc(void *buf, int i) -{ - return &((struct sudmac_desc *)buf)[i].shdma_desc; -} - -static const struct shdma_ops sudmac_shdma_ops = { - .desc_completed = sudmac_desc_completed, - .halt_channel = sudmac_halt, - .channel_busy = sudmac_channel_busy, - .slave_addr = sudmac_slave_addr, - .desc_setup = sudmac_desc_setup, - .set_slave = sudmac_set_slave, - .setup_xfer = sudmac_setup_xfer, - .start_xfer = sudmac_start_xfer, - .embedded_desc = sudmac_embedded_desc, - .chan_irq = sudmac_chan_irq, - .get_partial = sudmac_get_partial, -}; - -static int sudmac_probe(struct platform_device *pdev) -{ - struct sudmac_pdata *pdata = dev_get_platdata(&pdev->dev); - int err, i; - struct sudmac_device *su_dev; - struct dma_device *dma_dev; - struct resource *chan, *irq_res; - - /* get platform data */ - if (!pdata) - return -ENODEV; - - irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!irq_res) - return -ENODEV; - - err = -ENOMEM; - su_dev = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_device), - GFP_KERNEL); - if (!su_dev) - return err; - - dma_dev = &su_dev->shdma_dev.dma_dev; - - chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); - su_dev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); - if (IS_ERR(su_dev->chan_reg)) - return PTR_ERR(su_dev->chan_reg); - - dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); - - su_dev->shdma_dev.ops = &sudmac_shdma_ops; - su_dev->shdma_dev.desc_size = sizeof(struct sudmac_desc); - err = shdma_init(&pdev->dev, &su_dev->shdma_dev, pdata->channel_num); - if (err < 0) - return err; - - /* platform data */ - su_dev->pdata = dev_get_platdata(&pdev->dev); - - platform_set_drvdata(pdev, su_dev); - - /* Create DMA Channel */ - for (i = 0; i < pdata->channel_num; i++) { - err = sudmac_chan_probe(su_dev, i, irq_res->start, IRQF_SHARED); - if (err) - goto chan_probe_err; - } - - err = dma_async_device_register(&su_dev->shdma_dev.dma_dev); - if (err < 0) - goto chan_probe_err; - - return err; - -chan_probe_err: - sudmac_chan_remove(su_dev); - - shdma_cleanup(&su_dev->shdma_dev); - - return err; -} - -static int sudmac_remove(struct platform_device *pdev) -{ - struct sudmac_device *su_dev = platform_get_drvdata(pdev); - struct dma_device *dma_dev = &su_dev->shdma_dev.dma_dev; - - dma_async_device_unregister(dma_dev); - sudmac_chan_remove(su_dev); - shdma_cleanup(&su_dev->shdma_dev); - - return 0; -} - -static struct platform_driver sudmac_driver = { - .driver = { - .name = SUDMAC_DRV_NAME, - }, - .probe = sudmac_probe, - .remove = sudmac_remove, -}; -module_platform_driver(sudmac_driver); - -MODULE_AUTHOR("Yoshihiro Shimoda"); -MODULE_DESCRIPTION("Renesas SUDMAC driver"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:" SUDMAC_DRV_NAME); |