Commit d666cd02 authored by Kevin Cernekee's avatar Kevin Cernekee Committed by Ralf Baechle
Browse files

MIPS: bcm3384: Initial commit of bcm3384 platform support 

This supports SMP Linux running on the BCM3384 Zephyr (BMIPS5000)
application processor, with fully functional UART and USB 1.1/2.0.
Device Tree is used to configure the following items:

 - All peripherals
 - Early console base address
 - SMP or UP mode
 - MIPS counter frequency
 - Memory size / regions
 - DMA offset
 - Kernel command line

The DT-enabled bootloader and build instructions are posted at
https://github.com/Broadcom/aeolus



Signed-off-by: default avatarKevin Cernekee <cernekee@gmail.com>
Cc: f.fainelli@gmail.com
Cc: mbizon@freebox.fr
Cc: jogo@openwrt.org
Cc: jfraser@broadcom.com
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8170/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent ab81ce62

arch/mips/Kbuild.platforms

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
platforms += alchemy

platforms += ar7

platforms += ath79

platforms += bcm3384

platforms += bcm47xx

platforms += bcm63xx

platforms += cavium-octeon

arch/mips/Kconfig

+26 −0
Original line number Diff line number Diff line
@@ -116,6 +116,32 @@ config ATH79 
	help

	  Support for the Atheros AR71XX/AR724X/AR913X SoCs.



config BCM3384

	bool "Broadcom BCM3384 based boards"

	select BOOT_RAW

	select NO_EXCEPT_FILL

	select USE_OF

	select CEVT_R4K

	select CSRC_R4K

	select SYNC_R4K

	select COMMON_CLK

	select DMA_NONCOHERENT

	select IRQ_CPU

	select SYS_SUPPORTS_32BIT_KERNEL

	select SYS_SUPPORTS_BIG_ENDIAN

	select SYS_SUPPORTS_HIGHMEM

	select SYS_HAS_CPU_BMIPS5000

	select SWAP_IO_SPACE

	select USB_EHCI_BIG_ENDIAN_DESC

	select USB_EHCI_BIG_ENDIAN_MMIO

	select USB_OHCI_BIG_ENDIAN_DESC

	select USB_OHCI_BIG_ENDIAN_MMIO

	help

	  Support for BCM3384 based boards.  BCM3384/BCM33843 is a cable modem

	  chipset with a Linux application processor that is often used to

	  provide Samba services, a CUPS print server, and/or advanced routing

	  features.



config BCM47XX

	bool "Broadcom BCM47XX based boards"

	select ARCH_WANT_OPTIONAL_GPIOLIB

arch/mips/bcm3384/Makefile

0 → 100644
+1 −0
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obj-y		+= setup.o irq.o dma.o

arch/mips/bcm3384/Platform

0 → 100644
+7 −0
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#

# Broadcom BCM3384 boards

#

platform-$(CONFIG_BCM3384)	+= bcm3384/

cflags-$(CONFIG_BCM3384)	+=					\

		-I$(srctree)/arch/mips/include/asm/mach-bcm3384/

load-$(CONFIG_BCM3384)		:= 0xffffffff80010000

arch/mips/bcm3384/dma.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2014 Kevin Cernekee <cernekee@gmail.com>

 */



#include <linux/device.h>

#include <linux/dma-direction.h>

#include <linux/dma-mapping.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/of.h>

#include <linux/pci.h>

#include <linux/types.h>

#include <dma-coherence.h>



/*

 * BCM3384 has configurable address translation windows which allow the

 * peripherals' DMA addresses to be different from the Zephyr-visible

 * physical addresses.  e.g. usb_dma_addr = zephyr_pa ^ 0x08000000

 *

 * If our DT "memory" node has a "dma-xor-mask" property we will enable this

 * translation using the provided offset.

 */

static u32 bcm3384_dma_xor_mask;

static u32 bcm3384_dma_xor_limit = 0xffffffff;



/*

 * PCI collapses the memory hole at 0x10000000 - 0x1fffffff.

 * On systems with a dma-xor-mask, this range is guaranteed to live above

 * the dma-xor-limit.

 */

#define BCM3384_MEM_HOLE_PA	0x10000000

#define BCM3384_MEM_HOLE_SIZE	0x10000000



static dma_addr_t bcm3384_phys_to_dma(struct device *dev, phys_addr_t pa)

{

	if (dev && dev_is_pci(dev) &&

	    pa >= (BCM3384_MEM_HOLE_PA + BCM3384_MEM_HOLE_SIZE))

		return pa - BCM3384_MEM_HOLE_SIZE;

	if (pa <= bcm3384_dma_xor_limit)

		return pa ^ bcm3384_dma_xor_mask;

	return pa;

}



dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)

{

	return bcm3384_phys_to_dma(dev, virt_to_phys(addr));

}



dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)

{

	return bcm3384_phys_to_dma(dev, page_to_phys(page));

}



unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)

{

	if (dev && dev_is_pci(dev) &&

	    dma_addr >= BCM3384_MEM_HOLE_PA)

		return dma_addr + BCM3384_MEM_HOLE_SIZE;

	if ((dma_addr ^ bcm3384_dma_xor_mask) <= bcm3384_dma_xor_limit)

		return dma_addr ^ bcm3384_dma_xor_mask;

	return dma_addr;

}



static int __init bcm3384_init_dma_xor(void)

{

	struct device_node *np = of_find_node_by_type(NULL, "memory");



	if (!np)

		return 0;



	of_property_read_u32(np, "dma-xor-mask", &bcm3384_dma_xor_mask);

	of_property_read_u32(np, "dma-xor-limit", &bcm3384_dma_xor_limit);



	of_node_put(np);

	return 0;

}

arch_initcall(bcm3384_init_dma_xor);

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