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Commit 2101e533 authored by Hauke Mehrtens's avatar Hauke Mehrtens Committed by John W. Linville
Browse files

bcma: register bcma as device tree driver 



This driver is used by the bcm53xx ARM SoC code. Now it is possible to
give the address of the chipcommon core in device tree and bcma will
search for all the other cores.

Signed-off-by: default avatarHauke Mehrtens <hauke@hauke-m.de>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 7e174833

Documentation/devicetree/bindings/bus/bcma.txt

0 → 100644
+20 −0
Original line number Diff line number Diff line 
Driver for ARM AXI Bus with Broadcom Plugins (bcma)



Required properties:



- compatible : brcm,bus-axi



- reg : iomem address range of chipcommon core



The cores on the AXI bus are automatically detected by bcma with the

memory ranges they are using and they get registered afterwards.



Example:



	axi@18000000 {

		compatible = "brcm,bus-axi";

		reg = <0x18000000 0x1000>;

		ranges = <0x00000000 0x18000000 0x00100000>;

		#address-cells = <1>;

		#size-cells = <1>;

	};

drivers/bcma/bcma_private.h

+14 −0
Original line number Diff line number Diff line
@@ -88,6 +88,20 @@ extern int __init bcma_host_pci_init(void); 
extern void __exit bcma_host_pci_exit(void);

#endif /* CONFIG_BCMA_HOST_PCI */



/* host_soc.c */

#if defined(CONFIG_BCMA_HOST_SOC) && defined(CONFIG_OF)

extern int __init bcma_host_soc_register_driver(void);

extern void __exit bcma_host_soc_unregister_driver(void);

#else

static inline int __init bcma_host_soc_register_driver(void)

{

	return 0;

}

static inline void __exit bcma_host_soc_unregister_driver(void)

{

}

#endif /* CONFIG_BCMA_HOST_SOC && CONFIG_OF */



/* driver_pci.c */

u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address);

drivers/bcma/host_soc.c

+81 −0
Original line number Diff line number Diff line
@@ -7,6 +7,9 @@ 


#include "bcma_private.h"

#include "scan.h"

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/bcma/bcma.h>

#include <linux/bcma/bcma_soc.h>
@@ -176,6 +179,7 @@ int __init bcma_host_soc_register(struct bcma_soc *soc) 
	/* Host specific */

	bus->hosttype = BCMA_HOSTTYPE_SOC;

	bus->ops = &bcma_host_soc_ops;

	bus->host_pdev = NULL;



	/* Initialize struct, detect chip */

	bcma_init_bus(bus);
@@ -195,3 +199,80 @@ int __init bcma_host_soc_init(struct bcma_soc *soc) 


	return err;

}



#ifdef CONFIG_OF

static int bcma_host_soc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct bcma_bus *bus;

	int err;



	/* Alloc */

	bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);

	if (!bus)

		return -ENOMEM;



	/* Map MMIO */

	bus->mmio = of_iomap(np, 0);

	if (!bus->mmio)

		return -ENOMEM;



	/* Host specific */

	bus->hosttype = BCMA_HOSTTYPE_SOC;

	bus->ops = &bcma_host_soc_ops;

	bus->host_pdev = pdev;



	/* Initialize struct, detect chip */

	bcma_init_bus(bus);



	/* Register */

	err = bcma_bus_register(bus);

	if (err)

		goto err_unmap_mmio;



	platform_set_drvdata(pdev, bus);



	return err;



err_unmap_mmio:

	iounmap(bus->mmio);

	return err;

}



static int bcma_host_soc_remove(struct platform_device *pdev)

{

	struct bcma_bus *bus = platform_get_drvdata(pdev);



	bcma_bus_unregister(bus);

	iounmap(bus->mmio);

	platform_set_drvdata(pdev, NULL);



	return 0;

}



static const struct of_device_id bcma_host_soc_of_match[] = {

	{ .compatible = "brcm,bus-axi", },

	{},

};

MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);



static struct platform_driver bcma_host_soc_driver = {

	.driver = {

		.name = "bcma-host-soc",

		.of_match_table = bcma_host_soc_of_match,

	},

	.probe		= bcma_host_soc_probe,

	.remove		= bcma_host_soc_remove,

};



int __init bcma_host_soc_register_driver(void)

{

	return platform_driver_register(&bcma_host_soc_driver);

}



void __exit bcma_host_soc_unregister_driver(void)

{

	platform_driver_unregister(&bcma_host_soc_driver);

}

#endif /* CONFIG_OF */

drivers/bcma/main.c

+51 −1
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/platform_device.h>

#include <linux/bcma/bcma.h>

#include <linux/slab.h>

#include <linux/of_address.h>



MODULE_DESCRIPTION("Broadcom's specific AMBA driver");

MODULE_LICENSE("GPL");
@@ -131,6 +132,43 @@ static bool bcma_is_core_needed_early(u16 core_id) 
	return false;

}



#ifdef CONFIG_OF

static struct device_node *bcma_of_find_child_device(struct platform_device *parent,

						     struct bcma_device *core)

{

	struct device_node *node;

	u64 size;

	const __be32 *reg;



	if (!parent || !parent->dev.of_node)

		return NULL;



	for_each_child_of_node(parent->dev.of_node, node) {

		reg = of_get_address(node, 0, &size, NULL);

		if (!reg)

			continue;

		if (of_translate_address(node, reg) == core->addr)

			return node;

	}

	return NULL;

}



static void bcma_of_fill_device(struct platform_device *parent,

				struct bcma_device *core)

{

	struct device_node *node;



	node = bcma_of_find_child_device(parent, core);

	if (node)

		core->dev.of_node = node;

}

#else

static void bcma_of_fill_device(struct platform_device *parent,

				struct bcma_device *core)

{

}

#endif /* CONFIG_OF */



static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)

{

	int err;
@@ -147,7 +185,13 @@ static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core) 
		break;

	case BCMA_HOSTTYPE_SOC:

		core->dev.dma_mask = &core->dev.coherent_dma_mask;

		if (bus->host_pdev) {

			core->dma_dev = &bus->host_pdev->dev;

			core->dev.parent = &bus->host_pdev->dev;

			bcma_of_fill_device(bus->host_pdev, core);

		} else {

			core->dma_dev = &core->dev;

		}

		break;

	case BCMA_HOSTTYPE_SDIO:

		break;
@@ -528,6 +572,11 @@ static int __init bcma_modinit(void) 
	if (err)

		return err;



	err = bcma_host_soc_register_driver();

	if (err) {

		pr_err("SoC host initialization failed\n");

		err = 0;

	}

#ifdef CONFIG_BCMA_HOST_PCI

	err = bcma_host_pci_init();

	if (err) {
@@ -545,6 +594,7 @@ static void __exit bcma_modexit(void) 
#ifdef CONFIG_BCMA_HOST_PCI

	bcma_host_pci_exit();

#endif

	bcma_host_soc_unregister_driver();

	bus_unregister(&bcma_bus_type);

}

module_exit(bcma_modexit)

include/linux/bcma/bcma.h

+2 −0
Original line number Diff line number Diff line
@@ -323,6 +323,8 @@ struct bcma_bus { 
		struct pci_dev *host_pci;

		/* Pointer to the SDIO device (only for BCMA_HOSTTYPE_SDIO) */

		struct sdio_func *host_sdio;

		/* Pointer to platform device (only for BCMA_HOSTTYPE_SOC) */

		struct platform_device *host_pdev;

	};



	struct bcma_chipinfo chipinfo;