fsl/fman: Add FMan MURAM support

Add Frame Manager Multi-User RAM support.
This internal FMan memory block is used by the
FMan hardware modules, the management being made
through the generic allocator.

The FMan Internal memory, for example, is used for
allocating transmit and receive FIFOs.
Signed-off-by: Igal Liberman <Igal.Liberman@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/Kconfig

@@ -54,6 +54,7 @@ config FEC_MPC52xx_MDIO
 	  If compiled as module, it will be called fec_mpc52xx_phy.
 
 source "drivers/net/ethernet/freescale/fs_enet/Kconfig"
+source "drivers/net/ethernet/freescale/fman/Kconfig"
 
 config FSL_PQ_MDIO
 	tristate "Freescale PQ MDIO"

drivers/net/ethernet/freescale/Makefile

@@ -17,3 +17,5 @@ gianfar_driver-objs := gianfar.o \
 		gianfar_ethtool.o
 obj-$(CONFIG_UCC_GETH) += ucc_geth_driver.o
 ucc_geth_driver-objs := ucc_geth.o ucc_geth_ethtool.o
+
+obj-$(CONFIG_FSL_FMAN) += fman/

drivers/net/ethernet/freescale/fman/Kconfig

+config FSL_FMAN
+	bool "FMan support"
+	depends on FSL_SOC || COMPILE_TEST
+	select GENERIC_ALLOCATOR
+	default n
+	help
+		Freescale Data-Path Acceleration Architecture Frame Manager
+		(FMan) support

drivers/net/ethernet/freescale/fman/Makefile

+subdir-ccflags-y +=  -I$(srctree)/drivers/net/ethernet/freescale/fman
+
+obj-y		+= fsl_fman.o
+
+fsl_fman-objs	:= fman_muram.o

drivers/net/ethernet/freescale/fman/fman_muram.c

+/*
+ * Copyright 2008-2015 Freescale Semiconductor Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "fman_muram.h"
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/genalloc.h>
+
+struct muram_info {
+	struct gen_pool *pool;
+	void __iomem *vbase;
+	size_t size;
+	phys_addr_t pbase;
+};
+
+static unsigned long fman_muram_vbase_to_offset(struct muram_info *muram,
+						unsigned long vaddr)
+{
+	return vaddr - (unsigned long)muram->vbase;
+}
+
+/**
+ * fman_muram_init
+ * @base:	Pointer to base of memory mapped FM-MURAM.
+ * @size:	Size of the FM-MURAM partition.
+ *
+ * Creates partition in the MURAM.
+ * The routine returns a pointer to the MURAM partition.
+ * This pointer must be passed as to all other FM-MURAM function calls.
+ * No actual initialization or configuration of FM_MURAM hardware is done by
+ * this routine.
+ *
+ * Return: pointer to FM-MURAM object, or NULL for Failure.
+ */
+struct muram_info *fman_muram_init(phys_addr_t base, size_t size)
+{
+	struct muram_info *muram;
+	void __iomem *vaddr;
+	int ret;
+
+	muram = kzalloc(sizeof(*muram), GFP_KERNEL);
+	if (!muram)
+		return NULL;
+
+	muram->pool = gen_pool_create(ilog2(64), -1);
+	if (!muram->pool) {
+		pr_err("%s(): MURAM pool create failed\n", __func__);
+		goto  muram_free;
+	}
+
+	vaddr = ioremap(base, size);
+	if (!vaddr) {
+		pr_err("%s(): MURAM ioremap failed\n", __func__);
+		goto pool_destroy;
+	}
+
+	ret = gen_pool_add_virt(muram->pool, (unsigned long)vaddr,
+				base, size, -1);
+	if (ret < 0) {
+		pr_err("%s(): MURAM pool add failed\n", __func__);
+		iounmap(vaddr);
+		goto pool_destroy;
+	}
+
+	memset_io(vaddr, 0, (int)size);
+
+	muram->vbase = vaddr;
+	muram->pbase = base;
+	return muram;
+
+pool_destroy:
+	gen_pool_destroy(muram->pool);
+muram_free:
+	kfree(muram);
+	return NULL;
+}
+
+/**
+ * fman_muram_offset_to_vbase
+ * @muram:	FM-MURAM module pointer.
+ * @offset:	the offset of the memory block
+ *
+ * Gives the address of the memory region from specific offset
+ *
+ * Return: The address of the memory block
+ */
+unsigned long fman_muram_offset_to_vbase(struct muram_info *muram,
+					 unsigned long offset)
+{
+	return offset + (unsigned long)muram->vbase;
+}
+
+/**
+ * fman_muram_alloc
+ * @muram:	FM-MURAM module pointer.
+ * @size:	Size of the memory to be allocated.
+ *
+ * Allocate some memory from FM-MURAM partition.
+ *
+ * Return: address of the allocated memory; NULL otherwise.
+ */
+int fman_muram_alloc(struct muram_info *muram, size_t size)
+{
+	unsigned long vaddr;
+
+	vaddr = gen_pool_alloc(muram->pool, size);
+	if (!vaddr)
+		return -ENOMEM;
+
+	memset_io((void __iomem *)vaddr, 0, size);
+
+	return fman_muram_vbase_to_offset(muram, vaddr);
+}
+
+/**
+ * fman_muram_free_mem
+ * muram:	FM-MURAM module pointer.
+ * offset:	offset of the memory region to be freed.
+ * size:	size of the memory to be freed.
+ *
+ * Free an allocated memory from FM-MURAM partition.
+ */
+void fman_muram_free_mem(struct muram_info *muram, u32 offset, size_t size)
+{
+	unsigned long addr = fman_muram_offset_to_vbase(muram, offset);
+
+	gen_pool_free(muram->pool, addr, size);
+}

drivers/net/ethernet/freescale/fman/fman_muram.h

+/*
+ * Copyright 2008-2015 Freescale Semiconductor Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __FM_MURAM_EXT
+#define __FM_MURAM_EXT
+
+#include <linux/types.h>
+
+#define FM_MURAM_INVALID_ALLOCATION	-1
+
+/* Structure for FM MURAM information */
+struct muram_info;
+
+struct muram_info *fman_muram_init(phys_addr_t base, size_t size);
+
+unsigned long fman_muram_offset_to_vbase(struct muram_info *muram,
+					 unsigned long offset);
+
+int fman_muram_alloc(struct muram_info *muram, size_t size);
+
+void fman_muram_free_mem(struct muram_info *muram, u32 offset, size_t size);
+
+#endif /* __FM_MURAM_EXT */