diff options
Diffstat (limited to 'arch/arm/plat-mxs/dma-apbx.c')
-rw-r--r-- | arch/arm/plat-mxs/dma-apbx.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/arm/plat-mxs/dma-apbx.c b/arch/arm/plat-mxs/dma-apbx.c new file mode 100644 index 000000000000..6d77a6933d98 --- /dev/null +++ b/arch/arm/plat-mxs/dma-apbx.c @@ -0,0 +1,205 @@ +/* + * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved. + * + * This program 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/list.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/dmapool.h> +#include <linux/delay.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <mach/device.h> +#include <mach/dmaengine.h> + +#include "regs-apbx.h" + +static int mxs_dma_apbx_enable(struct mxs_dma_chan *pchan, unsigned int chan) +{ + unsigned int sem; + struct mxs_dma_device *pdev = pchan->dma; + struct mxs_dma_desc *pdesc; + + pdesc = list_first_entry(&pchan->active, struct mxs_dma_desc, node); + if (pdesc == NULL) + return -EFAULT; + sem = __raw_readl(pdev->base + HW_APBX_CHn_SEMA(chan)); + sem = (sem & BM_APBX_CHn_SEMA_PHORE) >> BP_APBX_CHn_SEMA_PHORE; + if (pchan->flags & MXS_DMA_FLAGS_BUSY) { + if (pdesc->cmd.cmd.bits.chain == 0) + return 0; + if (sem < 2) { + if (!sem) + return 0; + pdesc = list_entry(pdesc->node.next, + struct mxs_dma_desc, node); + __raw_writel(mxs_dma_cmd_address(pdesc), + pdev->base + HW_APBX_CHn_NXTCMDAR(chan)); + } + sem = pchan->pending_num; + pchan->pending_num = 0; + __raw_writel(BF_APBX_CHn_SEMA_INCREMENT_SEMA(sem), + pdev->base + HW_APBX_CHn_SEMA(chan)); + pchan->active_num += sem; + return 0; + } + pchan->active_num += pchan->pending_num; + pchan->pending_num = 0; + __raw_writel(mxs_dma_cmd_address(pdesc), + pdev->base + HW_APBX_CHn_NXTCMDAR(chan)); + __raw_writel(pchan->active_num, pdev->base + HW_APBX_CHn_SEMA(chan)); + return 0; +} + +static void mxs_dma_apbx_disable(struct mxs_dma_chan *pchan, unsigned int chan) +{ + struct mxs_dma_device *pdev = pchan->dma; + __raw_writel(0, pdev->base + HW_APBX_CHn_SEMA(chan)); +} + +static void mxs_dma_apbx_reset(struct mxs_dma_device *pdev, unsigned int chan) +{ + __raw_writel(1 << (chan + BP_APBX_CHANNEL_CTRL_RESET_CHANNEL), + pdev->base + HW_APBX_CHANNEL_CTRL_SET); +} + +static void mxs_dma_apbx_freeze(struct mxs_dma_device *pdev, unsigned int chan) +{ + __raw_writel(1 << chan, pdev->base + HW_APBX_CHANNEL_CTRL_SET); +} + +static void +mxs_dma_apbx_unfreeze(struct mxs_dma_device *pdev, unsigned int chan) +{ + __raw_writel(1 << chan, pdev->base + HW_APBX_CHANNEL_CTRL_CLR); +} + +static void mxs_dma_apbx_info(struct mxs_dma_device *pdev, + unsigned int chan, struct mxs_dma_info *info) +{ + unsigned int reg; + reg = __raw_readl(pdev->base + HW_APBX_CTRL2); + info->status = reg >> chan; + info->buf_addr = __raw_readl(pdev->base + HW_APBX_CHn_BAR(chan)); + reg = __raw_readl(pdev->base + HW_APBX_CHn_CMD(chan)); + info->xfer_count = (reg & BM_APBX_CHn_CMD_XFER_COUNT) >> \ + BP_APBX_CHn_CMD_XFER_COUNT; +} + +static int +mxs_dma_apbx_read_semaphore(struct mxs_dma_device *pdev, unsigned int chan) +{ + unsigned int reg; + reg = __raw_readl(pdev->base + HW_APBX_CHn_SEMA(chan)); + return (reg & BM_APBX_CHn_SEMA_PHORE) >> BP_APBX_CHn_SEMA_PHORE; +} + +static void +mxs_dma_apbx_enable_irq(struct mxs_dma_device *pdev, + unsigned int chan, int enable) +{ + if (enable) { + __raw_writel(1 << (chan + 16), pdev->base + HW_APBX_CTRL1_SET); + } else { + __raw_writel(1 << (chan + 16), pdev->base + HW_APBX_CTRL1_CLR); + } +} + +static int +mxs_dma_apbx_irq_is_pending(struct mxs_dma_device *pdev, unsigned int chan) +{ + unsigned int reg; + reg = __raw_readl(pdev->base + HW_APBX_CTRL1); + reg |= __raw_readl(pdev->base + HW_APBX_CTRL2); + return reg & (1 << chan); +} + +static void mxs_dma_apbx_ack_irq(struct mxs_dma_device *pdev, unsigned int chan) +{ + __raw_writel(1 << chan, pdev->base + HW_APBX_CTRL1_CLR); + __raw_writel(1 << chan, pdev->base + HW_APBX_CTRL2_CLR); +} + +static struct mxs_dma_device mxs_dma_apbx = { + .name = "mxs-dma-apbx", + .enable = mxs_dma_apbx_enable, + .disable = mxs_dma_apbx_disable, + .reset = mxs_dma_apbx_reset, + .freeze = mxs_dma_apbx_freeze, + .unfreeze = mxs_dma_apbx_unfreeze, + .info = mxs_dma_apbx_info, + .read_semaphore = mxs_dma_apbx_read_semaphore, + .enable_irq = mxs_dma_apbx_enable_irq, + .irq_is_pending = mxs_dma_apbx_irq_is_pending, + .ack_irq = mxs_dma_apbx_ack_irq, +}; + +static int __devinit dma_apbx_probe(struct platform_device *pdev) +{ + int i; + struct resource *res; + struct mxs_dma_plat_data *plat; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENOMEM; + mxs_dma_apbx.base = IO_ADDRESS(res->start); + __raw_writel(BM_APBX_CTRL0_SFTRST, + mxs_dma_apbx.base + HW_APBX_CTRL0_CLR); + for (i = 0; i < 10000; i++) { + if (!(__raw_readl(mxs_dma_apbx.base + HW_APBX_CTRL0_CLR) & + BM_APBX_CTRL0_SFTRST)) + break; + udelay(2); + } + if (i >= 10000) + return -ETIME; + __raw_writel(BM_APBX_CTRL0_CLKGATE, + mxs_dma_apbx.base + HW_APBX_CTRL0_CLR); + + plat = (struct mxs_dma_plat_data *)pdev->dev.platform_data; + if (!plat) + return -ENODEV; + + mxs_dma_apbx.pdev = pdev; + mxs_dma_apbx.chan_base = plat->chan_base; + mxs_dma_apbx.chan_num = plat->chan_num; + platform_set_drvdata(pdev, &mxs_dma_apbx); + return mxs_dma_device_register(&mxs_dma_apbx); +} + +static int __devexit dma_apbx_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver dma_apbx_driver = { + .probe = dma_apbx_probe, + .remove = __devexit_p(dma_apbx_remove), + .driver = { + .name = "mxs-dma-apbx"}, +}; + +static int __init mxs_dma_apbx_init(void) +{ + return platform_driver_register(&dma_apbx_driver); +} + +fs_initcall(mxs_dma_apbx_init); |