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Message-Id: <1351600332-29443-2-git-send-email-andriy.shevchenko@linux.intel.com>
Date: Tue, 30 Oct 2012 14:32:10 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Viresh Kumar <viresh.linux@...il.com>,
Vinod Koul <vinod.koul@...el.com>,
linux-kernel@...r.kernel.org, spear-devel <spear-devel@...t.st.com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH 1/3] dmaengine: dw_dmac: add PCI part of the driver
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
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@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/dma/Kconfig | 9 +++
drivers/dma/Makefile | 1 +
drivers/dma/dw_dmac_pci.c | 133 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+)
create mode 100644 drivers/dma/dw_dmac_pci.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 6761cc8..ae706ca 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -100,6 +100,15 @@ config DW_DMAC_BIG_ENDIAN_IO
If unsure, use the default setting.
+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 7428fea..15eef5f 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_FSL_DMA) += fsldma.o
obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
obj-$(CONFIG_MV_XOR) += mv_xor.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o
+obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
diff --git a/drivers/dma/dw_dmac_pci.c b/drivers/dma/dw_dmac_pci.c
new file mode 100644
index 0000000..043a963
--- /dev/null
+++ b/drivers/dma/dw_dmac_pci.c
@@ -0,0 +1,133 @@
+/*
+ * 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/idr.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/dw_dmac.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 DEFINE_IDA(dw_pci_ida);
+
+static int __devinit dw_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *pid)
+{
+ struct platform_device *pd;
+ struct resource r[2];
+ struct dw_dma_platform_data *driver = (void *)pid->driver_data;
+ int id, ret;
+
+ id = ida_simple_get(&dw_pci_ida, 0, 0, GFP_KERNEL);
+ if (id < 0)
+ return id;
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ goto put_id;
+
+ 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", id);
+ 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;
+ }
+
+ return 0;
+
+err1:
+ platform_device_put(pd);
+err0:
+ pci_disable_device(pdev);
+put_id:
+ ida_simple_remove(&dw_pci_ida, id);
+ return ret;
+}
+
+static void __devexit dw_pci_remove(struct pci_dev *pdev)
+{
+ struct platform_device *pd = pci_get_drvdata(pdev);
+
+ platform_device_unregister(pd);
+ ida_simple_remove(&dw_pci_ida, pd->id);
+ pci_set_drvdata(pdev, NULL);
+ pci_disable_device(pdev);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
+ { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
+ { PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },
+ { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },
+ { 0, }
+};
+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 = __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@...ux.intel.com>");
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@...ux.intel.com>");
--
1.7.10.4
--
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