diff options
author | Felix Fietkau <nbd@openwrt.org> | 2014-12-13 11:55:11 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2014-12-13 11:55:11 +0000 |
commit | 45380ebd1ab3d604ece3dd14a84f89fbc69ea7b1 (patch) | |
tree | 816e479975bb22e39e9cbdde8fdfb400f38f72a9 /target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch | |
parent | 170ce2961703fe3c2c74e9aa3088df2905b3697e (diff) | |
download | upstream-45380ebd1ab3d604ece3dd14a84f89fbc69ea7b1.tar.gz upstream-45380ebd1ab3d604ece3dd14a84f89fbc69ea7b1.tar.bz2 upstream-45380ebd1ab3d604ece3dd14a84f89fbc69ea7b1.zip |
brcm2708: remove linux 3.10 support
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 43687
Diffstat (limited to 'target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch')
-rw-r--r-- | target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch b/target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch deleted file mode 100644 index 9a21509f20..0000000000 --- a/target/linux/brcm2708/patches-3.10/0114-dmaengine-Add-support-for-BCM2708.patch +++ /dev/null @@ -1,640 +0,0 @@ -From f7a2665c5c7690e769a6010a88e2aca3477e5b1f Mon Sep 17 00:00:00 2001 -From: Florian Meier <florian.meier@koalo.de> -Date: Fri, 22 Nov 2013 14:22:53 +0100 -Subject: [PATCH 114/196] dmaengine: Add support for BCM2708 - -Add support for DMA controller of BCM2708 as used in the Raspberry Pi. -Currently it only supports cyclic DMA. - -Signed-off-by: Florian Meier <florian.meier@koalo.de> ---- - drivers/dma/Kconfig | 6 + - drivers/dma/Makefile | 1 + - drivers/dma/bcm2708-dmaengine.c | 588 ++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 595 insertions(+) - create mode 100644 drivers/dma/bcm2708-dmaengine.c - -diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig -index 0ba5a95..9a99add 100644 ---- a/drivers/dma/Kconfig -+++ b/drivers/dma/Kconfig -@@ -305,6 +305,12 @@ config DMA_OMAP - select DMA_ENGINE - select DMA_VIRTUAL_CHANNELS - -+config DMA_BCM2708 -+ tristate "BCM2708 DMA engine support" -+ depends on MACH_BCM2708 -+ select DMA_ENGINE -+ select DMA_VIRTUAL_CHANNELS -+ - config MMP_PDMA - bool "MMP PDMA support" - depends on (ARCH_MMP || ARCH_PXA) -diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile -index a2b0df5..d0f5b32 100644 ---- a/drivers/dma/Makefile -+++ b/drivers/dma/Makefile -@@ -37,4 +37,5 @@ obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o - obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o - obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o - obj-$(CONFIG_DMA_OMAP) += omap-dma.o -+obj-$(CONFIG_DMA_BCM2708) += bcm2708-dmaengine.o - obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o -diff --git a/drivers/dma/bcm2708-dmaengine.c b/drivers/dma/bcm2708-dmaengine.c -new file mode 100644 -index 0000000..3ba3cec ---- /dev/null -+++ b/drivers/dma/bcm2708-dmaengine.c -@@ -0,0 +1,588 @@ -+/* -+ * BCM2708 DMA engine support -+ * -+ * This driver only supports cyclic DMA transfers -+ * as needed for the I2S module. -+ * -+ * Author: Florian Meier <florian.meier@koalo.de> -+ * Copyright 2013 -+ * -+ * Based on -+ * OMAP DMAengine support by Russell King -+ * -+ * BCM2708 DMA Driver -+ * Copyright (C) 2010 Broadcom -+ * -+ * Raspberry Pi PCM I2S ALSA Driver -+ * Copyright (c) by Phil Poole 2013 -+ * -+ * MARVELL MMP Peripheral DMA Driver -+ * Copyright 2012 Marvell International Ltd. -+ * -+ * 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. -+ */ -+#include <linux/dmaengine.h> -+#include <linux/dma-mapping.h> -+#include <linux/err.h> -+#include <linux/init.h> -+#include <linux/interrupt.h> -+#include <linux/list.h> -+#include <linux/module.h> -+#include <linux/platform_device.h> -+#include <linux/slab.h> -+#include <linux/io.h> -+#include <linux/spinlock.h> -+#include <linux/irq.h> -+ -+#include "virt-dma.h" -+ -+#include <mach/dma.h> -+#include <mach/irqs.h> -+ -+struct bcm2708_dmadev { -+ struct dma_device ddev; -+ spinlock_t lock; -+ void __iomem *base; -+ struct device_dma_parameters dma_parms; -+}; -+ -+struct bcm2708_chan { -+ struct virt_dma_chan vc; -+ struct list_head node; -+ -+ struct dma_slave_config cfg; -+ bool cyclic; -+ -+ int ch; -+ struct bcm2708_desc *desc; -+ -+ void __iomem *chan_base; -+ int irq_number; -+}; -+ -+struct bcm2708_desc { -+ struct virt_dma_desc vd; -+ enum dma_transfer_direction dir; -+ -+ unsigned int control_block_size; -+ struct bcm2708_dma_cb *control_block_base; -+ dma_addr_t control_block_base_phys; -+ -+ unsigned frames; -+ size_t size; -+}; -+ -+#define BCM2708_DMA_DATA_TYPE_S8 1 -+#define BCM2708_DMA_DATA_TYPE_S16 2 -+#define BCM2708_DMA_DATA_TYPE_S32 4 -+#define BCM2708_DMA_DATA_TYPE_S128 16 -+ -+static inline struct bcm2708_dmadev *to_bcm2708_dma_dev(struct dma_device *d) -+{ -+ return container_of(d, struct bcm2708_dmadev, ddev); -+} -+ -+static inline struct bcm2708_chan *to_bcm2708_dma_chan(struct dma_chan *c) -+{ -+ return container_of(c, struct bcm2708_chan, vc.chan); -+} -+ -+static inline struct bcm2708_desc *to_bcm2708_dma_desc( -+ struct dma_async_tx_descriptor *t) -+{ -+ return container_of(t, struct bcm2708_desc, vd.tx); -+} -+ -+static void bcm2708_dma_desc_free(struct virt_dma_desc *vd) -+{ -+ struct bcm2708_desc *desc = container_of(vd, struct bcm2708_desc, vd); -+ dma_free_coherent(desc->vd.tx.chan->device->dev, -+ desc->control_block_size, -+ desc->control_block_base, -+ desc->control_block_base_phys); -+ kfree(desc); -+} -+ -+static void bcm2708_dma_start_desc(struct bcm2708_chan *c) -+{ -+ struct virt_dma_desc *vd = vchan_next_desc(&c->vc); -+ struct bcm2708_desc *d; -+ -+ if (!vd) { -+ c->desc = NULL; -+ return; -+ } -+ -+ list_del(&vd->node); -+ -+ c->desc = d = to_bcm2708_dma_desc(&vd->tx); -+ -+ bcm_dma_start(c->chan_base, d->control_block_base_phys); -+} -+ -+static irqreturn_t bcm2708_dma_callback(int irq, void *data) -+{ -+ struct bcm2708_chan *c = data; -+ struct bcm2708_desc *d; -+ unsigned long flags; -+ -+ spin_lock_irqsave(&c->vc.lock, flags); -+ -+ /* Acknowledge interrupt */ -+ writel(BCM2708_DMA_INT, c->chan_base + BCM2708_DMA_CS); -+ -+ d = c->desc; -+ -+ if (d) { -+ /* TODO Only works for cyclic DMA */ -+ vchan_cyclic_callback(&d->vd); -+ } -+ -+ /* Keep the DMA engine running */ -+ dsb(); /* ARM synchronization barrier */ -+ writel(BCM2708_DMA_ACTIVE, c->chan_base + BCM2708_DMA_CS); -+ -+ spin_unlock_irqrestore(&c->vc.lock, flags); -+ -+ return IRQ_HANDLED; -+} -+ -+static int bcm2708_dma_alloc_chan_resources(struct dma_chan *chan) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ -+ return request_irq(c->irq_number, -+ bcm2708_dma_callback, 0, "DMA IRQ", c); -+} -+ -+static void bcm2708_dma_free_chan_resources(struct dma_chan *chan) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ -+ vchan_free_chan_resources(&c->vc); -+ free_irq(c->irq_number, c); -+ -+ dev_dbg(c->vc.chan.device->dev, "Freeing DMA channel %u\n", c->ch); -+} -+ -+static size_t bcm2708_dma_desc_size(struct bcm2708_desc *d) -+{ -+ return d->size; -+} -+ -+static size_t bcm2708_dma_desc_size_pos(struct bcm2708_desc *d, dma_addr_t addr) -+{ -+ unsigned i; -+ size_t size; -+ -+ for (size = i = 0; i < d->frames; i++) { -+ struct bcm2708_dma_cb *control_block = -+ &d->control_block_base[i]; -+ size_t this_size = control_block->length; -+ dma_addr_t dma; -+ -+ if (d->dir == DMA_DEV_TO_MEM) -+ dma = control_block->dst; -+ else -+ dma = control_block->src; -+ -+ if (size) -+ size += this_size; -+ else if (addr >= dma && addr < dma + this_size) -+ size += dma + this_size - addr; -+ } -+ -+ return size; -+} -+ -+static enum dma_status bcm2708_dma_tx_status(struct dma_chan *chan, -+ dma_cookie_t cookie, struct dma_tx_state *txstate) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ struct virt_dma_desc *vd; -+ enum dma_status ret; -+ unsigned long flags; -+ -+ ret = dma_cookie_status(chan, cookie, txstate); -+ if (ret == DMA_SUCCESS || !txstate) -+ return ret; -+ -+ spin_lock_irqsave(&c->vc.lock, flags); -+ vd = vchan_find_desc(&c->vc, cookie); -+ if (vd) { -+ txstate->residue = -+ bcm2708_dma_desc_size(to_bcm2708_dma_desc(&vd->tx)); -+ } else if (c->desc && c->desc->vd.tx.cookie == cookie) { -+ struct bcm2708_desc *d = c->desc; -+ dma_addr_t pos; -+ -+ if (d->dir == DMA_MEM_TO_DEV) -+ pos = readl(c->chan_base + BCM2708_DMA_SOURCE_AD); -+ else if (d->dir == DMA_DEV_TO_MEM) -+ pos = readl(c->chan_base + BCM2708_DMA_DEST_AD); -+ else -+ pos = 0; -+ -+ txstate->residue = bcm2708_dma_desc_size_pos(d, pos); -+ } else { -+ txstate->residue = 0; -+ } -+ -+ spin_unlock_irqrestore(&c->vc.lock, flags); -+ -+ return ret; -+} -+ -+static void bcm2708_dma_issue_pending(struct dma_chan *chan) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ unsigned long flags; -+ -+ c->cyclic = true; /* Nothing else is implemented */ -+ -+ spin_lock_irqsave(&c->vc.lock, flags); -+ if (vchan_issue_pending(&c->vc) && !c->desc) -+ bcm2708_dma_start_desc(c); -+ -+ spin_unlock_irqrestore(&c->vc.lock, flags); -+} -+ -+static struct dma_async_tx_descriptor *bcm2708_dma_prep_dma_cyclic( -+ struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, -+ size_t period_len, enum dma_transfer_direction direction, -+ unsigned long flags, void *context) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ enum dma_slave_buswidth dev_width; -+ struct bcm2708_desc *d; -+ dma_addr_t dev_addr; -+ unsigned es, sync_type; -+ unsigned frame; -+ -+ /* Grab configuration */ -+ if (direction == DMA_DEV_TO_MEM) { -+ dev_addr = c->cfg.src_addr; -+ dev_width = c->cfg.src_addr_width; -+ sync_type = BCM2708_DMA_S_DREQ; -+ } else if (direction == DMA_MEM_TO_DEV) { -+ dev_addr = c->cfg.dst_addr; -+ dev_width = c->cfg.dst_addr_width; -+ sync_type = BCM2708_DMA_D_DREQ; -+ } else { -+ dev_err(chan->device->dev, "%s: bad direction?\n", __func__); -+ return NULL; -+ } -+ -+ /* Bus width translates to the element size (ES) */ -+ switch (dev_width) { -+ case DMA_SLAVE_BUSWIDTH_4_BYTES: -+ es = BCM2708_DMA_DATA_TYPE_S32; -+ break; -+ default: -+ return NULL; -+ } -+ -+ /* Now allocate and setup the descriptor. */ -+ d = kzalloc(sizeof(*d), GFP_NOWAIT); -+ if (!d) -+ return NULL; -+ -+ d->dir = direction; -+ d->frames = buf_len / period_len; -+ -+ /* Allocate memory for control blocks */ -+ d->control_block_size = d->frames * sizeof(struct bcm2708_dma_cb); -+ d->control_block_base = dma_zalloc_coherent(chan->device->dev, -+ d->control_block_size, &d->control_block_base_phys, -+ GFP_NOWAIT); -+ -+ if (!d->control_block_base) { -+ kfree(d); -+ return NULL; -+ } -+ -+ /* -+ * Iterate over all frames, create a control block -+ * for each frame and link them together. -+ */ -+ for (frame = 0; frame < d->frames; frame++) { -+ struct bcm2708_dma_cb *control_block = -+ &d->control_block_base[frame]; -+ -+ /* Setup adresses */ -+ if (d->dir == DMA_DEV_TO_MEM) { -+ control_block->info = BCM2708_DMA_D_INC; -+ control_block->src = dev_addr; -+ control_block->dst = buf_addr + frame * period_len; -+ } else { -+ control_block->info = BCM2708_DMA_S_INC; -+ control_block->src = buf_addr + frame * period_len; -+ control_block->dst = dev_addr; -+ } -+ -+ /* Enable interrupt */ -+ control_block->info |= BCM2708_DMA_INT_EN; -+ -+ /* Setup synchronization */ -+ if (sync_type != 0) -+ control_block->info |= sync_type; -+ -+ /* Setup DREQ channel */ -+ if (c->cfg.slave_id != 0) -+ control_block->info |= -+ BCM2708_DMA_PER_MAP(c->cfg.slave_id); -+ -+ /* Length of a frame */ -+ control_block->length = period_len; -+ d->size += control_block->length; -+ -+ /* -+ * Next block is the next frame. -+ * This DMA engine driver currently only supports cyclic DMA. -+ * Therefore, wrap around at number of frames. -+ */ -+ control_block->next = d->control_block_base_phys + -+ sizeof(struct bcm2708_dma_cb) -+ * ((frame + 1) % d->frames); -+ } -+ -+ return vchan_tx_prep(&c->vc, &d->vd, flags); -+} -+ -+static int bcm2708_dma_slave_config(struct bcm2708_chan *c, -+ struct dma_slave_config *cfg) -+{ -+ if ((cfg->direction == DMA_DEV_TO_MEM && -+ cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || -+ (cfg->direction == DMA_MEM_TO_DEV && -+ cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || -+ !is_slave_direction(cfg->direction)) { -+ return -EINVAL; -+ } -+ -+ c->cfg = *cfg; -+ -+ return 0; -+} -+ -+static int bcm2708_dma_terminate_all(struct bcm2708_chan *c) -+{ -+ struct bcm2708_dmadev *d = to_bcm2708_dma_dev(c->vc.chan.device); -+ unsigned long flags; -+ int timeout = 10000; -+ LIST_HEAD(head); -+ -+ spin_lock_irqsave(&c->vc.lock, flags); -+ -+ /* Prevent this channel being scheduled */ -+ spin_lock(&d->lock); -+ list_del_init(&c->node); -+ spin_unlock(&d->lock); -+ -+ /* -+ * Stop DMA activity: we assume the callback will not be called -+ * after bcm_dma_abort() returns (even if it does, it will see -+ * c->desc is NULL and exit.) -+ */ -+ if (c->desc) { -+ c->desc = NULL; -+ bcm_dma_abort(c->chan_base); -+ -+ /* Wait for stopping */ -+ while (timeout > 0) { -+ timeout--; -+ if (!(readl(c->chan_base + BCM2708_DMA_CS) & -+ BCM2708_DMA_ACTIVE)) -+ break; -+ -+ cpu_relax(); -+ } -+ -+ if (timeout <= 0) -+ dev_err(d->ddev.dev, "DMA transfer could not be terminated\n"); -+ } -+ -+ vchan_get_all_descriptors(&c->vc, &head); -+ spin_unlock_irqrestore(&c->vc.lock, flags); -+ vchan_dma_desc_free_list(&c->vc, &head); -+ -+ return 0; -+} -+ -+static int bcm2708_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, -+ unsigned long arg) -+{ -+ struct bcm2708_chan *c = to_bcm2708_dma_chan(chan); -+ -+ switch (cmd) { -+ case DMA_SLAVE_CONFIG: -+ return bcm2708_dma_slave_config(c, -+ (struct dma_slave_config *)arg); -+ -+ case DMA_TERMINATE_ALL: -+ return bcm2708_dma_terminate_all(c); -+ -+ default: -+ return -ENXIO; -+ } -+} -+ -+static int bcm2708_dma_chan_init(struct bcm2708_dmadev *d, void __iomem* chan_base, -+ int chan_id, int irq) -+{ -+ struct bcm2708_chan *c; -+ -+ c = devm_kzalloc(d->ddev.dev, sizeof(*c), GFP_KERNEL); -+ if (!c) -+ return -ENOMEM; -+ -+ c->vc.desc_free = bcm2708_dma_desc_free; -+ vchan_init(&c->vc, &d->ddev); -+ INIT_LIST_HEAD(&c->node); -+ -+ d->ddev.chancnt++; -+ -+ c->chan_base = chan_base; -+ c->ch = chan_id; -+ c->irq_number = irq; -+ -+ return 0; -+} -+ -+static void bcm2708_dma_free(struct bcm2708_dmadev *od) -+{ -+ while (!list_empty(&od->ddev.channels)) { -+ struct bcm2708_chan *c = list_first_entry(&od->ddev.channels, -+ struct bcm2708_chan, vc.chan.device_node); -+ -+ list_del(&c->vc.chan.device_node); -+ tasklet_kill(&c->vc.task); -+ } -+} -+ -+static int bcm2708_dma_probe(struct platform_device *pdev) -+{ -+ struct bcm2708_dmadev *od; -+ int rc, i; -+ -+ if (!pdev->dev.dma_mask) -+ pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; -+ -+ rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); -+ if (rc) -+ return rc; -+ dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); -+ -+ od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL); -+ if (!od) -+ return -ENOMEM; -+ -+ pdev->dev.dma_parms = &od->dma_parms; -+ dma_set_max_seg_size(&pdev->dev, 0x3FFFFFFF); -+ -+ dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); -+ dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); -+ od->ddev.device_alloc_chan_resources = bcm2708_dma_alloc_chan_resources; -+ od->ddev.device_free_chan_resources = bcm2708_dma_free_chan_resources; -+ od->ddev.device_tx_status = bcm2708_dma_tx_status; -+ od->ddev.device_issue_pending = bcm2708_dma_issue_pending; -+ od->ddev.device_prep_dma_cyclic = bcm2708_dma_prep_dma_cyclic; -+ od->ddev.device_control = bcm2708_dma_control; -+ od->ddev.dev = &pdev->dev; -+ INIT_LIST_HEAD(&od->ddev.channels); -+ spin_lock_init(&od->lock); -+ -+ platform_set_drvdata(pdev, od); -+ -+ for (i = 0; i < 16; i++) { -+ void __iomem* chan_base; -+ int chan_id, irq; -+ -+ chan_id = bcm_dma_chan_alloc(BCM_DMA_FEATURE_FAST, -+ &chan_base, -+ &irq); -+ -+ if (chan_id < 0) -+ break; -+ -+ rc = bcm2708_dma_chan_init(od, chan_base, chan_id, irq); -+ if (rc) { -+ bcm2708_dma_free(od); -+ return rc; -+ } -+ } -+ -+ rc = dma_async_device_register(&od->ddev); -+ if (rc) { -+ dev_err(&pdev->dev, -+ "Failed to register slave DMA engine device: %d\n", rc); -+ bcm2708_dma_free(od); -+ return rc; -+ } -+ -+ dev_dbg(&pdev->dev, "Load BCM2708 DMA engine driver\n"); -+ -+ return rc; -+} -+ -+static int bcm2708_dma_remove(struct platform_device *pdev) -+{ -+ struct bcm2708_dmadev *od = platform_get_drvdata(pdev); -+ -+ dma_async_device_unregister(&od->ddev); -+ bcm2708_dma_free(od); -+ -+ return 0; -+} -+ -+static struct platform_driver bcm2708_dma_driver = { -+ .probe = bcm2708_dma_probe, -+ .remove = bcm2708_dma_remove, -+ .driver = { -+ .name = "bcm2708-dmaengine", -+ .owner = THIS_MODULE, -+ }, -+}; -+ -+static struct platform_device *pdev; -+ -+static const struct platform_device_info bcm2708_dma_dev_info = { -+ .name = "bcm2708-dmaengine", -+ .id = -1, -+}; -+ -+static int bcm2708_dma_init(void) -+{ -+ int rc = platform_driver_register(&bcm2708_dma_driver); -+ -+ if (rc == 0) { -+ pdev = platform_device_register_full(&bcm2708_dma_dev_info); -+ if (IS_ERR(pdev)) { -+ platform_driver_unregister(&bcm2708_dma_driver); -+ rc = PTR_ERR(pdev); -+ } -+ } -+ -+ return rc; -+} -+subsys_initcall(bcm2708_dma_init); -+ -+static void __exit bcm2708_dma_exit(void) -+{ -+ platform_device_unregister(pdev); -+ platform_driver_unregister(&bcm2708_dma_driver); -+} -+module_exit(bcm2708_dma_exit); -+ -+MODULE_ALIAS("platform:bcm2708-dma"); -+MODULE_DESCRIPTION("BCM2708 DMA engine driver"); -+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>"); -+MODULE_LICENSE("GPL v2"); --- -1.9.1 - |