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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/dma/dw/of.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/dma/dw/of.c')
-rw-r--r--drivers/dma/dw/of.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/dma/dw/of.c b/drivers/dma/dw/of.c
new file mode 100644
index 000000000..523ca8068
--- /dev/null
+++ b/drivers/dma/dw/of.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2007-2008 Atmel Corporation
+ * Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2013 Intel Corporation
+ */
+
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+
+#include "internal.h"
+
+static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct dw_dma *dw = ofdma->of_dma_data;
+ struct dw_dma_slave slave = {
+ .dma_dev = dw->dma.dev,
+ };
+ dma_cap_mask_t cap;
+
+ if (dma_spec->args_count < 3 || dma_spec->args_count > 4)
+ return NULL;
+
+ slave.src_id = dma_spec->args[0];
+ slave.dst_id = dma_spec->args[0];
+ slave.m_master = dma_spec->args[1];
+ slave.p_master = dma_spec->args[2];
+ if (dma_spec->args_count >= 4)
+ slave.channels = dma_spec->args[3];
+
+ if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
+ slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
+ slave.m_master >= dw->pdata->nr_masters ||
+ slave.p_master >= dw->pdata->nr_masters ||
+ slave.channels >= BIT(dw->pdata->nr_channels)))
+ return NULL;
+
+ dma_cap_zero(cap);
+ dma_cap_set(DMA_SLAVE, cap);
+
+ /* TODO: there should be a simpler way to do this */
+ return dma_request_channel(cap, dw_dma_filter, &slave);
+}
+
+struct dw_dma_platform_data *dw_dma_parse_dt(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct dw_dma_platform_data *pdata;
+ u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
+ u32 nr_masters;
+ u32 nr_channels;
+
+ if (of_property_read_u32(np, "dma-masters", &nr_masters))
+ return NULL;
+ if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
+ return NULL;
+
+ if (of_property_read_u32(np, "dma-channels", &nr_channels))
+ return NULL;
+ if (nr_channels > DW_DMA_MAX_NR_CHANNELS)
+ return NULL;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ pdata->nr_masters = nr_masters;
+ pdata->nr_channels = nr_channels;
+
+ of_property_read_u32(np, "chan_allocation_order", &pdata->chan_allocation_order);
+ of_property_read_u32(np, "chan_priority", &pdata->chan_priority);
+
+ of_property_read_u32(np, "block_size", &pdata->block_size);
+
+ /* Try deprecated property first */
+ if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
+ for (tmp = 0; tmp < nr_masters; tmp++)
+ pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
+ }
+
+ /* If "data_width" and "data-width" both provided use the latter one */
+ of_property_read_u32_array(np, "data-width", pdata->data_width, nr_masters);
+
+ memset32(pdata->multi_block, 1, nr_channels);
+ of_property_read_u32_array(np, "multi-block", pdata->multi_block, nr_channels);
+
+ memset32(pdata->max_burst, DW_DMA_MAX_BURST, nr_channels);
+ of_property_read_u32_array(np, "snps,max-burst-len", pdata->max_burst, nr_channels);
+
+ of_property_read_u32(np, "snps,dma-protection-control", &pdata->protctl);
+ if (pdata->protctl > CHAN_PROTCTL_MASK)
+ return NULL;
+
+ return pdata;
+}
+
+void dw_dma_of_controller_register(struct dw_dma *dw)
+{
+ struct device *dev = dw->dma.dev;
+ int ret;
+
+ if (!dev->of_node)
+ return;
+
+ ret = of_dma_controller_register(dev->of_node, dw_dma_of_xlate, dw);
+ if (ret)
+ dev_err(dev, "could not register of_dma_controller\n");
+}
+
+void dw_dma_of_controller_free(struct dw_dma *dw)
+{
+ struct device *dev = dw->dma.dev;
+
+ if (!dev->of_node)
+ return;
+
+ of_dma_controller_free(dev->of_node);
+}