[PATCHv1 3/6] dmaengine: dw_dmac: Add PCI part of the driver
From: Andy Shevchenko
Date: Tue Sep 25 2012 - 08:13:13 EST
From: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
This is the PCI part of the DesignWare DMAC driver. The controller is usually
used in the Intel hardware such as Medfield.
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/dma/Kconfig | 9 +++
drivers/dma/Makefile | 1 +
drivers/dma/dw_dmac_at32.c | 1 +
drivers/dma/dw_dmac_pci.c | 130 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 141 insertions(+)
create mode 100644 drivers/dma/dw_dmac_pci.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index e47cc90..3850f8d 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -98,6 +98,15 @@ config DW_DMAC_AT32
Support the Synopsys DesignWare AHB DMA controller in the chips
such as the Atmel AT32ap7000.
+config DW_DMAC_PCI
+ tristate "Synopsys DesignWare AHB DMA support (PCI bus)"
+ depends on PCI
+ select DW_DMAC
+ help
+ Support the Synopsys DesignWare AHB DMA controller on the platfroms
+ that provide it as a PCI device. For example, Intel Medfield has
+ integrated this GPDMA controller.
+
config AT_HDMAC
tristate "Atmel AHB DMA support"
depends on ARCH_AT91
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index d76020b..ae660ed 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
obj-$(CONFIG_MV_XOR) += mv_xor.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o
obj-$(CONFIG_DW_DMAC_AT32) += dw_dmac_at32.o
+obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
diff --git a/drivers/dma/dw_dmac_at32.c b/drivers/dma/dw_dmac_at32.c
index 7bc7ac4..5c9180e 100644
--- a/drivers/dma/dw_dmac_at32.c
+++ b/drivers/dma/dw_dmac_at32.c
@@ -12,6 +12,7 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
diff --git a/drivers/dma/dw_dmac_pci.c b/drivers/dma/dw_dmac_pci.c
new file mode 100644
index 0000000..7490894
--- /dev/null
+++ b/drivers/dma/dw_dmac_pci.c
@@ -0,0 +1,130 @@
+/*
+ * PCI driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2012 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/dw_dmac.h>
+
+#define DW_DRIVER_NAME "dw_dmac_pci"
+
+#define DRIVER(_is_private, _chan_order, _chan_pri) \
+ ((kernel_ulong_t)&(struct dw_dma_platform_data) { \
+ .is_private = (_is_private), \
+ .chan_allocation_order = (_chan_order), \
+ .chan_priority = (_chan_pri), \
+ })
+
+static int __devinit dw_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct platform_device *pd;
+ struct resource r[2];
+ struct dw_dma_platform_data *driver = (void *)id->driver_data;
+ static int instance;
+ int ret;
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_set_master(pdev);
+ pci_try_set_mwi(pdev);
+
+ ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (ret)
+ goto err0;
+
+ ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (ret)
+ goto err0;
+
+ pd = platform_device_alloc("dw_dmac", instance);
+ if (!pd) {
+ dev_err(&pdev->dev, "can't allocate dw_dmac platform device\n");
+ ret = -ENOMEM;
+ goto err0;
+ }
+
+ memset(r, 0, sizeof(r));
+
+ r[0].start = pci_resource_start(pdev, 0);
+ r[0].end = pci_resource_end(pdev, 0);
+ r[0].flags = IORESOURCE_MEM;
+
+ r[1].start = pdev->irq;
+ r[1].flags = IORESOURCE_IRQ;
+
+ ret = platform_device_add_resources(pd, r, ARRAY_SIZE(r));
+ if (ret) {
+ dev_err(&pdev->dev, "can't add resources to platform device\n");
+ goto err1;
+ }
+
+ ret = platform_device_add_data(pd, driver, sizeof(*driver));
+ if (ret)
+ goto err1;
+
+ dma_set_coherent_mask(&pd->dev, pdev->dev.coherent_dma_mask);
+ pd->dev.dma_mask = pdev->dev.dma_mask;
+ pd->dev.dma_parms = pdev->dev.dma_parms;
+ pd->dev.parent = &pdev->dev;
+
+ pci_set_drvdata(pdev, pd);
+
+ ret = platform_device_add(pd);
+ if (ret) {
+ dev_err(&pdev->dev, "platform_device_add failed\n");
+ goto err1;
+ }
+
+ instance++;
+ return 0;
+
+err1:
+ pci_set_drvdata(pdev, NULL);
+ platform_device_put(pd);
+err0:
+ pci_disable_device(pdev);
+
+ return ret;
+}
+
+static void __devexit dw_pci_remove(struct pci_dev *pdev)
+{
+ struct platform_device *pd = pci_get_drvdata(pdev);
+
+ platform_device_unregister(pd);
+ pci_set_drvdata(pdev, NULL);
+ pci_disable_device(pdev);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
+ { PCI_VDEVICE(INTEL, 0x0827), DRIVER(1, 0, 0) },
+ { PCI_VDEVICE(INTEL, 0x0830), DRIVER(1, 0, 0) },
+ { PCI_VDEVICE(INTEL, 0x0f06), DRIVER(1, 0, 0) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
+
+static struct pci_driver dw_pci_driver = {
+ .name = DW_DRIVER_NAME,
+ .id_table = dw_pci_id_table,
+ .probe = dw_pci_probe,
+ .remove = __devexit_p(dw_pci_remove),
+};
+
+module_pci_driver(dw_pci_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare DMAC PCI driver");
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>");
--
1.7.10.4
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