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Subject[PATCH v2 4/4] dma: dw: add PCI part of the driver
Date
This is the PCI part of the DesignWare DMAC driver. The controller is usually
used in the Intel hardware such as Intel Medfield.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/dma/dw/Kconfig | 9 +++++
drivers/dma/dw/Makefile | 3 ++
drivers/dma/dw/pci.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 113 insertions(+)
create mode 100644 drivers/dma/dw/pci.c

diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig
index efd9e02..db2b41f 100644
--- a/drivers/dma/dw/Kconfig
+++ b/drivers/dma/dw/Kconfig
@@ -15,6 +15,15 @@ config DW_DMAC
Support the Synopsys DesignWare AHB DMA controller. This
can be integrated in chips such as the Atmel AT32ap7000.

+config DW_DMAC_PCI
+ tristate "Synopsys DesignWare AHB DMA PCI driver"
+ depends on PCI
+ select DW_DMAC_CORE
+ help
+ Support the Synopsys DesignWare AHB DMA controller on the
+ platfroms that enumerate it as a PCI device. For example,
+ Intel Medfield has integrated this GPDMA controller.
+
config DW_DMAC_BIG_ENDIAN_IO
bool "Use big endian I/O register access"
default y if AVR32
diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile
index 47f3674..3eebd1c 100644
--- a/drivers/dma/dw/Makefile
+++ b/drivers/dma/dw/Makefile
@@ -3,3 +3,6 @@ dw_dmac_core-objs := core.o

obj-$(CONFIG_DW_DMAC) += dw_dmac.o
dw_dmac-objs := platform.o
+
+obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o
+dw_dmac_pci-objs := pci.o
diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
new file mode 100644
index 0000000..e89fc24
--- /dev/null
+++ b/drivers/dma/dw/pci.c
@@ -0,0 +1,101 @@
+/*
+ * PCI driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2013 Intel Corporation
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *
+ * 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/device.h>
+
+#include "internal.h"
+
+static struct dw_dma_platform_data dw_pci_pdata = {
+ .is_private = 1,
+ .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
+ .chan_priority = CHAN_PRIORITY_ASCENDING,
+};
+
+static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
+{
+ struct dw_dma_chip *chip;
+ struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
+ int ret;
+
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
+ if (ret) {
+ dev_err(&pdev->dev, "I/O memory remapping failed\n");
+ return ret;
+ }
+
+ pci_set_master(pdev);
+ pci_try_set_mwi(pdev);
+
+ ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &pdev->dev;
+ chip->regs = pcim_iomap_table(pdev)[0];
+ chip->irq = pdev->irq;
+
+ ret = dw_dma_probe(chip, pdata);
+ if (ret)
+ return ret;
+
+ pci_set_drvdata(pdev, chip);
+
+ return 0;
+}
+
+static void dw_pci_remove(struct pci_dev *pdev)
+{
+ struct dw_dma_chip *chip = pci_get_drvdata(pdev);
+ int ret;
+
+ ret = dw_dma_remove(chip);
+ if (ret)
+ dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
+ /* Medfield */
+ { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
+ { PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },
+
+ /* BayTrail */
+ { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },
+ { PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
+
+static struct pci_driver dw_pci_driver = {
+ .name = "dw_dmac_pci",
+ .id_table = dw_pci_id_table,
+ .probe = dw_pci_probe,
+ .remove = dw_pci_remove,
+};
+
+module_pci_driver(dw_pci_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
--
1.8.2.rc0.22.gb3600c3


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