Merge tag 'tags/drivers_for_v3.10' into mvebu/soc

mvebu drivers for v3.10

 - mvebu: mbus driver for kirkwood, dove, orion5x, mv78xx, and armada 370/xp

drivers/bus/Kconfig

@@ -4,6 +4,13 @@
 
 menu "Bus devices"
 
+config MVEBU_MBUS
+	bool
+	depends on PLAT_ORION
+	help
+	  Driver needed for the MBus configuration on Marvell EBU SoCs
+	  (Kirkwood, Dove, Orion5x, MV78XX0 and Armada 370/XP).
+
 config OMAP_OCP2SCP
 	tristate "OMAP OCP2SCP DRIVER"
 	depends on ARCH_OMAP2PLUS

drivers/bus/Makefile

@@ -2,6 +2,7 @@
 # Makefile for the bus drivers.
 #
 
+obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o
 obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o
 
 # Interconnect bus driver for OMAP SoCs.

drivers/bus/mvebu-mbus.c

+/*
+ * Address map functions for Marvell EBU SoCs (Kirkwood, Armada
+ * 370/XP, Dove, Orion5x and MV78xx0)
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * The Marvell EBU SoCs have a configurable physical address space:
+ * the physical address at which certain devices (PCIe, NOR, NAND,
+ * etc.) sit can be configured. The configuration takes place through
+ * two sets of registers:
+ *
+ * - One to configure the access of the CPU to the devices. Depending
+ *   on the families, there are between 8 and 20 configurable windows,
+ *   each can be use to create a physical memory window that maps to a
+ *   specific device. Devices are identified by a tuple (target,
+ *   attribute).
+ *
+ * - One to configure the access to the CPU to the SDRAM. There are
+ *   either 2 (for Dove) or 4 (for other families) windows to map the
+ *   SDRAM into the physical address space.
+ *
+ * This driver:
+ *
+ * - Reads out the SDRAM address decoding windows at initialization
+ *   time, and fills the mvebu_mbus_dram_info structure with these
+ *   informations. The exported function mv_mbus_dram_info() allow
+ *   device drivers to get those informations related to the SDRAM
+ *   address decoding windows. This is because devices also have their
+ *   own windows (configured through registers that are part of each
+ *   device register space), and therefore the drivers for Marvell
+ *   devices have to configure those device -> SDRAM windows to ensure
+ *   that DMA works properly.
+ *
+ * - Provides an API for platform code or device drivers to
+ *   dynamically add or remove address decoding windows for the CPU ->
+ *   device accesses. This API is mvebu_mbus_add_window(),
+ *   mvebu_mbus_add_window_remap_flags() and
+ *   mvebu_mbus_del_window(). Since the (target, attribute) values
+ *   differ from one SoC family to another, the API uses a 'const char
+ *   *' string to identify devices, and this driver is responsible for
+ *   knowing the mapping between the name of a device and its
+ *   corresponding (target, attribute) in the current SoC family.
+ *
+ * - Provides a debugfs interface in /sys/kernel/debug/mvebu-mbus/ to
+ *   see the list of CPU -> SDRAM windows and their configuration
+ *   (file 'sdram') and the list of CPU -> devices windows and their
+ *   configuration (file 'devices').
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mbus.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/debugfs.h>
+
+/*
+ * DDR target is the same on all platforms.
+ */
+#define TARGET_DDR		0
+
+/*
+ * CPU Address Decode Windows registers
+ */
+#define WIN_CTRL_OFF		0x0000
+#define   WIN_CTRL_ENABLE       BIT(0)
+#define   WIN_CTRL_TGT_MASK     0xf0
+#define   WIN_CTRL_TGT_SHIFT    4
+#define   WIN_CTRL_ATTR_MASK    0xff00
+#define   WIN_CTRL_ATTR_SHIFT   8
+#define   WIN_CTRL_SIZE_MASK    0xffff0000
+#define   WIN_CTRL_SIZE_SHIFT   16
+#define WIN_BASE_OFF		0x0004
+#define   WIN_BASE_LOW          0xffff0000
+#define   WIN_BASE_HIGH         0xf
+#define WIN_REMAP_LO_OFF	0x0008
+#define   WIN_REMAP_LOW         0xffff0000
+#define WIN_REMAP_HI_OFF	0x000c
+
+#define ATTR_HW_COHERENCY	(0x1 << 4)
+
+#define DDR_BASE_CS_OFF(n)	(0x0000 + ((n) << 3))
+#define  DDR_BASE_CS_HIGH_MASK  0xf
+#define  DDR_BASE_CS_LOW_MASK   0xff000000
+#define DDR_SIZE_CS_OFF(n)	(0x0004 + ((n) << 3))
+#define  DDR_SIZE_ENABLED       BIT(0)
+#define  DDR_SIZE_CS_MASK       0x1c
+#define  DDR_SIZE_CS_SHIFT      2
+#define  DDR_SIZE_MASK          0xff000000
+
+#define DOVE_DDR_BASE_CS_OFF(n) ((n) << 4)
+
+struct mvebu_mbus_mapping {
+	const char *name;
+	u8 target;
+	u8 attr;
+	u8 attrmask;
+};
+
+/*
+ * Masks used for the 'attrmask' field of mvebu_mbus_mapping. They
+ * allow to get the real attribute value, discarding the special bits
+ * used to select a PCI MEM region or a PCI WA region. This allows the
+ * debugfs code to reverse-match the name of a device from its
+ * target/attr values.
+ *
+ * For all devices except PCI, all bits of 'attr' must be
+ * considered. For most SoCs, only bit 3 should be ignored (it allows
+ * to select between PCI MEM and PCI I/O). On Orion5x however, there
+ * is the special bit 5 to select a PCI WA region.
+ */
+#define MAPDEF_NOMASK       0xff
+#define MAPDEF_PCIMASK      0xf7
+#define MAPDEF_ORIONPCIMASK 0xd7
+
+/* Macro used to define one mvebu_mbus_mapping entry */
+#define MAPDEF(__n, __t, __a, __m) \
+	{ .name = __n, .target = __t, .attr = __a, .attrmask = __m }
+
+struct mvebu_mbus_state;
+
+struct mvebu_mbus_soc_data {
+	unsigned int num_wins;
+	unsigned int num_remappable_wins;
+	unsigned int (*win_cfg_offset)(const int win);
+	void (*setup_cpu_target)(struct mvebu_mbus_state *s);
+	int (*show_cpu_target)(struct mvebu_mbus_state *s,
+			       struct seq_file *seq, void *v);
+	const struct mvebu_mbus_mapping *map;
+};
+
+struct mvebu_mbus_state {
+	void __iomem *mbuswins_base;
+	void __iomem *sdramwins_base;
+	struct dentry *debugfs_root;
+	struct dentry *debugfs_sdram;
+	struct dentry *debugfs_devs;
+	const struct mvebu_mbus_soc_data *soc;
+	int hw_io_coherency;
+};
+
+static struct mvebu_mbus_state mbus_state;
+
+static struct mbus_dram_target_info mvebu_mbus_dram_info;
+const struct mbus_dram_target_info *mv_mbus_dram_info(void)
+{
+	return &mvebu_mbus_dram_info;
+}
+EXPORT_SYMBOL_GPL(mv_mbus_dram_info);
+
+/*
+ * Functions to manipulate the address decoding windows
+ */
+
+static void mvebu_mbus_read_window(struct mvebu_mbus_state *mbus,
+				   int win, int *enabled, u64 *base,
+				   u32 *size, u8 *target, u8 *attr,
+				   u64 *remap)
+{
+	void __iomem *addr = mbus->mbuswins_base +
+		mbus->soc->win_cfg_offset(win);
+	u32 basereg = readl(addr + WIN_BASE_OFF);
+	u32 ctrlreg = readl(addr + WIN_CTRL_OFF);
+
+	if (!(ctrlreg & WIN_CTRL_ENABLE)) {
+		*enabled = 0;
+		return;
+	}
+
+	*enabled = 1;
+	*base = ((u64)basereg & WIN_BASE_HIGH) << 32;
+	*base |= (basereg & WIN_BASE_LOW);
+	*size = (ctrlreg | ~WIN_CTRL_SIZE_MASK) + 1;
+
+	if (target)
+		*target = (ctrlreg & WIN_CTRL_TGT_MASK) >> WIN_CTRL_TGT_SHIFT;
+
+	if (attr)
+		*attr = (ctrlreg & WIN_CTRL_ATTR_MASK) >> WIN_CTRL_ATTR_SHIFT;
+
+	if (remap) {
+		if (win < mbus->soc->num_remappable_wins) {
+			u32 remap_low = readl(addr + WIN_REMAP_LO_OFF);
+			u32 remap_hi  = readl(addr + WIN_REMAP_HI_OFF);
+			*remap = ((u64)remap_hi << 32) | remap_low;
+		} else
+			*remap = 0;
+	}
+}
+
+static void mvebu_mbus_disable_window(struct mvebu_mbus_state *mbus,
+				      int win)
+{
+	void __iomem *addr;
+
+	addr = mbus->mbuswins_base + mbus->soc->win_cfg_offset(win);
+
+	writel(0, addr + WIN_BASE_OFF);
+	writel(0, addr + WIN_CTRL_OFF);
+	if (win < mbus->soc->num_remappable_wins) {
+		writel(0, addr + WIN_REMAP_LO_OFF);
+		writel(0, addr + WIN_REMAP_HI_OFF);
+	}
+}
+
+/* Checks whether the given window number is available */
+static int mvebu_mbus_window_is_free(struct mvebu_mbus_state *mbus,
+				     const int win)
+{
+	void __iomem *addr = mbus->mbuswins_base +
+		mbus->soc->win_cfg_offset(win);
+	u32 ctrl = readl(addr + WIN_CTRL_OFF);
+	return !(ctrl & WIN_CTRL_ENABLE);
+}
+
+/*
+ * Checks whether the given (base, base+size) area doesn't overlap an
+ * existing region
+ */
+static int mvebu_mbus_window_conflicts(struct mvebu_mbus_state *mbus,
+				       phys_addr_t base, size_t size,
+				       u8 target, u8 attr)
+{
+	u64 end = (u64)base + size;
+	int win;
+
+	for (win = 0; win < mbus->soc->num_wins; win++) {
+		u64 wbase, wend;
+		u32 wsize;
+		u8 wtarget, wattr;
+		int enabled;
+
+		mvebu_mbus_read_window(mbus, win,
+				       &enabled, &wbase, &wsize,
+				       &wtarget, &wattr, NULL);
+
+		if (!enabled)
+			continue;
+
+		wend = wbase + wsize;
+
+		/*
+		 * Check if the current window overlaps with the
+		 * proposed physical range
+		 */
+		if ((u64)base < wend && end > wbase)
+			return 0;
+
+		/*
+		 * Check if target/attribute conflicts
+		 */
+		if (target == wtarget && attr == wattr)
+			return 0;
+	}
+
+	return 1;
+}
+
+static int mvebu_mbus_find_window(struct mvebu_mbus_state *mbus,
+				  phys_addr_t base, size_t size)
+{
+	int win;
+
+	for (win = 0; win < mbus->soc->num_wins; win++) {
+		u64 wbase;
+		u32 wsize;
+		int enabled;
+
+		mvebu_mbus_read_window(mbus, win,
+				       &enabled, &wbase, &wsize,
+				       NULL, NULL, NULL);
+
+		if (!enabled)
+			continue;
+
+		if (base == wbase && size == wsize)
+			return win;
+	}
+
+	return -ENODEV;
+}
+
+static int mvebu_mbus_setup_window(struct mvebu_mbus_state *mbus,
+				   int win, phys_addr_t base, size_t size,
+				   phys_addr_t remap, u8 target,
+				   u8 attr)
+{
+	void __iomem *addr = mbus->mbuswins_base +
+		mbus->soc->win_cfg_offset(win);
+	u32 ctrl, remap_addr;
+
+	ctrl = ((size - 1) & WIN_CTRL_SIZE_MASK) |
+		(attr << WIN_CTRL_ATTR_SHIFT)    |
+		(target << WIN_CTRL_TGT_SHIFT)   |
+		WIN_CTRL_ENABLE;
+
+	writel(base & WIN_BASE_LOW, addr + WIN_BASE_OFF);
+	writel(ctrl, addr + WIN_CTRL_OFF);
+	if (win < mbus->soc->num_remappable_wins) {
+		if (remap == MVEBU_MBUS_NO_REMAP)
+			remap_addr = base;
+		else
+			remap_addr = remap;
+		writel(remap_addr & WIN_REMAP_LOW, addr + WIN_REMAP_LO_OFF);
+		writel(0, addr + WIN_REMAP_HI_OFF);
+	}
+
+	return 0;
+}
+
+static int mvebu_mbus_alloc_window(struct mvebu_mbus_state *mbus,
+				   phys_addr_t base, size_t size,
+				   phys_addr_t remap, u8 target,
+				   u8 attr)
+{
+	int win;
+
+	if (remap == MVEBU_MBUS_NO_REMAP) {
+		for (win = mbus->soc->num_remappable_wins;
+		     win < mbus->soc->num_wins; win++)
+			if (mvebu_mbus_window_is_free(mbus, win))
+				return mvebu_mbus_setup_window(mbus, win, base,
+							       size, remap,
+							       target, attr);
+	}
+
+
+	for (win = 0; win < mbus->soc->num_wins; win++)
+		if (mvebu_mbus_window_is_free(mbus, win))
+			return mvebu_mbus_setup_window(mbus, win, base, size,
+						       remap, target, attr);
+
+	return -ENOMEM;
+}
+
+/*
+ * Debugfs debugging
+ */
+
+/* Common function used for Dove, Kirkwood, Armada 370/XP and Orion 5x */
+static int mvebu_sdram_debug_show_orion(struct mvebu_mbus_state *mbus,
+					struct seq_file *seq, void *v)
+{
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		u32 basereg = readl(mbus->sdramwins_base + DDR_BASE_CS_OFF(i));
+		u32 sizereg = readl(mbus->sdramwins_base + DDR_SIZE_CS_OFF(i));
+		u64 base;
+		u32 size;
+
+		if (!(sizereg & DDR_SIZE_ENABLED)) {
+			seq_printf(seq, "[%d] disabled\n", i);
+			continue;
+		}
+
+		base = ((u64)basereg & DDR_BASE_CS_HIGH_MASK) << 32;
+		base |= basereg & DDR_BASE_CS_LOW_MASK;
+		size = (sizereg | ~DDR_SIZE_MASK);
+
+		seq_printf(seq, "[%d] %016llx - %016llx : cs%d\n",
+			   i, (unsigned long long)base,
+			   (unsigned long long)base + size + 1,
+			   (sizereg & DDR_SIZE_CS_MASK) >> DDR_SIZE_CS_SHIFT);
+	}
+
+	return 0;
+}
+
+/* Special function for Dove */
+static int mvebu_sdram_debug_show_dove(struct mvebu_mbus_state *mbus,
+				       struct seq_file *seq, void *v)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		u32 map = readl(mbus->sdramwins_base + DOVE_DDR_BASE_CS_OFF(i));
+		u64 base;
+		u32 size;
+
+		if (!(map & 1)) {
+			seq_printf(seq, "[%d] disabled\n", i);
+			continue;
+		}
+
+		base = map & 0xff800000;
+		size = 0x100000 << (((map & 0x000f0000) >> 16) - 4);
+
+		seq_printf(seq, "[%d] %016llx - %016llx : cs%d\n",
+			   i, (unsigned long long)base,
+			   (unsigned long long)base + size, i);
+	}
+
+	return 0;
+}
+
+static int mvebu_sdram_debug_show(struct seq_file *seq, void *v)
+{
+	struct mvebu_mbus_state *mbus = &mbus_state;
+	return mbus->soc->show_cpu_target(mbus, seq, v);
+}
+
+static int mvebu_sdram_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mvebu_sdram_debug_show, inode->i_private);
+}
+
+static const struct file_operations mvebu_sdram_debug_fops = {
+	.open = mvebu_sdram_debug_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int mvebu_devs_debug_show(struct seq_file *seq, void *v)
+{
+	struct mvebu_mbus_state *mbus = &mbus_state;
+	int win;
+
+	for (win = 0; win < mbus->soc->num_wins; win++) {
+		u64 wbase, wremap;
+		u32 wsize;
+		u8 wtarget, wattr;
+		int enabled, i;
+		const char *name;
+
+		mvebu_mbus_read_window(mbus, win,
+				       &enabled, &wbase, &wsize,
+				       &wtarget, &wattr, &wremap);
+
+		if (!enabled) {
+			seq_printf(seq, "[%02d] disabled\n", win);
+			continue;
+		}
+
+
+		for (i = 0; mbus->soc->map[i].name; i++)
+			if (mbus->soc->map[i].target == wtarget &&
+			    mbus->soc->map[i].attr ==
+			    (wattr & mbus->soc->map[i].attrmask))
+				break;
+
+		name = mbus->soc->map[i].name ?: "unknown";
+
+		seq_printf(seq, "[%02d] %016llx - %016llx : %s",
+			   win, (unsigned long long)wbase,
+			   (unsigned long long)(wbase + wsize), name);
+
+		if (win < mbus->soc->num_remappable_wins) {
+			seq_printf(seq, " (remap %016llx)\n",
+				   (unsigned long long)wremap);
+		} else
+			seq_printf(seq, "\n");
+	}
+
+	return 0;
+}
+
+static int mvebu_devs_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mvebu_devs_debug_show, inode->i_private);
+}
+
+static const struct file_operations mvebu_devs_debug_fops = {
+	.open = mvebu_devs_debug_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+/*
+ * SoC-specific functions and definitions
+ */
+
+static unsigned int orion_mbus_win_offset(int win)
+{
+	return win << 4;
+}
+
+static unsigned int armada_370_xp_mbus_win_offset(int win)
+{
+	/* The register layout is a bit annoying and the below code
+	 * tries to cope with it.
+	 * - At offset 0x0, there are the registers for the first 8
+	 *   windows, with 4 registers of 32 bits per window (ctrl,
+	 *   base, remap low, remap high)
+	 * - Then at offset 0x80, there is a hole of 0x10 bytes for
+	 *   the internal registers base address and internal units
+	 *   sync barrier register.
+	 * - Then at offset 0x90, there the registers for 12
+	 *   windows, with only 2 registers of 32 bits per window
+	 *   (ctrl, base).
+	 */
+	if (win < 8)
+		return win << 4;
+	else
+		return 0x90 + ((win - 8) << 3);
+}
+
+static unsigned int mv78xx0_mbus_win_offset(int win)
+{
+	if (win < 8)
+		return win << 4;
+	else
+		return 0x900 + ((win - 8) << 4);
+}
+
+static void __init
+mvebu_mbus_default_setup_cpu_target(struct mvebu_mbus_state *mbus)
+{
+	int i;
+	int cs;
+
+	mvebu_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
+
+	for (i = 0, cs = 0; i < 4; i++) {
+		u32 base = readl(mbus->sdramwins_base + DDR_BASE_CS_OFF(i));
+		u32 size = readl(mbus->sdramwins_base + DDR_SIZE_CS_OFF(i));
+
+		/*
+		 * We only take care of entries for which the chip
+		 * select is enabled, and that don't have high base
+		 * address bits set (devices can only access the first
+		 * 32 bits of the memory).
+		 */
+		if ((size & DDR_SIZE_ENABLED) &&
+		    !(base & DDR_BASE_CS_HIGH_MASK)) {
+			struct mbus_dram_window *w;
+
+			w = &mvebu_mbus_dram_info.cs[cs++];
+			w->cs_index = i;
+			w->mbus_attr = 0xf & ~(1 << i);
+			if (mbus->hw_io_coherency)
+				w->mbus_attr |= ATTR_HW_COHERENCY;
+			w->base = base & DDR_BASE_CS_LOW_MASK;
+			w->size = (size | ~DDR_SIZE_MASK) + 1;
+		}
+	}
+	mvebu_mbus_dram_info.num_cs = cs;
+}
+
+static void __init
+mvebu_mbus_dove_setup_cpu_target(struct mvebu_mbus_state *mbus)
+{
+	int i;
+	int cs;
+
+	mvebu_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
+
+	for (i = 0, cs = 0; i < 2; i++) {
+		u32 map = readl(mbus->sdramwins_base + DOVE_DDR_BASE_CS_OFF(i));
+
+		/*
+		 * Chip select enabled?
+		 */
+		if (map & 1) {
+			struct mbus_dram_window *w;
+
+			w = &mvebu_mbus_dram_info.cs[cs++];
+			w->cs_index = i;
+			w->mbus_attr = 0; /* CS address decoding done inside */
+					  /* the DDR controller, no need to  */
+					  /* provide attributes */
+			w->base = map & 0xff800000;
+			w->size = 0x100000 << (((map & 0x000f0000) >> 16) - 4);
+		}
+	}
+
+	mvebu_mbus_dram_info.num_cs = cs;
+}
+
+static const struct mvebu_mbus_mapping armada_370_map[] = {
+	MAPDEF("bootrom",     1, 0xe0, MAPDEF_NOMASK),
+	MAPDEF("devbus-boot", 1, 0x2f, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs0",  1, 0x3e, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs1",  1, 0x3d, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs2",  1, 0x3b, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs3",  1, 0x37, MAPDEF_NOMASK),
+	MAPDEF("pcie0.0",     4, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.0",     8, 0xe0, MAPDEF_PCIMASK),
+	{},
+};
+
+static const struct mvebu_mbus_soc_data armada_370_mbus_data = {
+	.num_wins            = 20,
+	.num_remappable_wins = 8,
+	.win_cfg_offset      = armada_370_xp_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = armada_370_map,
+};
+
+static const struct mvebu_mbus_mapping armada_xp_map[] = {
+	MAPDEF("bootrom",     1, 0x1d, MAPDEF_NOMASK),
+	MAPDEF("devbus-boot", 1, 0x2f, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs0",  1, 0x3e, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs1",  1, 0x3d, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs2",  1, 0x3b, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs3",  1, 0x37, MAPDEF_NOMASK),
+	MAPDEF("pcie0.0",     4, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.1",     4, 0xd0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.2",     4, 0xb0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.3",     4, 0x70, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.0",     8, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.1",     8, 0xd0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.2",     8, 0xb0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.3",     8, 0x70, MAPDEF_PCIMASK),
+	MAPDEF("pcie2.0",     4, 0xf0, MAPDEF_PCIMASK),
+	MAPDEF("pcie3.0",     8, 0xf0, MAPDEF_PCIMASK),
+	{},
+};
+
+static const struct mvebu_mbus_soc_data armada_xp_mbus_data = {
+	.num_wins            = 20,
+	.num_remappable_wins = 8,
+	.win_cfg_offset      = armada_370_xp_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = armada_xp_map,
+};
+
+static const struct mvebu_mbus_mapping kirkwood_map[] = {
+	MAPDEF("pcie0.0", 4, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.0", 4, 0xd0, MAPDEF_PCIMASK),
+	MAPDEF("sram",    3, 0x01, MAPDEF_NOMASK),
+	MAPDEF("nand",    1, 0x2f, MAPDEF_NOMASK),
+	{},
+};
+
+static const struct mvebu_mbus_soc_data kirkwood_mbus_data = {
+	.num_wins            = 8,
+	.num_remappable_wins = 4,
+	.win_cfg_offset      = orion_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = kirkwood_map,
+};
+
+static const struct mvebu_mbus_mapping dove_map[] = {
+	MAPDEF("pcie0.0",    0x4, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.0",    0x8, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("cesa",       0x3, 0x01, MAPDEF_NOMASK),
+	MAPDEF("bootrom",    0x1, 0xfd, MAPDEF_NOMASK),
+	MAPDEF("scratchpad", 0xd, 0x0, MAPDEF_NOMASK),
+	{},
+};
+
+static const struct mvebu_mbus_soc_data dove_mbus_data = {
+	.num_wins            = 8,
+	.num_remappable_wins = 4,
+	.win_cfg_offset      = orion_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_dove_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_dove,
+	.map                 = dove_map,
+};
+
+static const struct mvebu_mbus_mapping orion5x_map[] = {
+	MAPDEF("pcie0.0",     4, 0x51, MAPDEF_ORIONPCIMASK),
+	MAPDEF("pci0.0",      3, 0x51, MAPDEF_ORIONPCIMASK),
+	MAPDEF("devbus-boot", 1, 0x0f, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs0",  1, 0x1e, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs1",  1, 0x1d, MAPDEF_NOMASK),
+	MAPDEF("devbus-cs2",  1, 0x1b, MAPDEF_NOMASK),
+	MAPDEF("sram",        0, 0x00, MAPDEF_NOMASK),
+	{},
+};
+
+/*
+ * Some variants of Orion5x have 4 remappable windows, some other have
+ * only two of them.
+ */
+static const struct mvebu_mbus_soc_data orion5x_4win_mbus_data = {
+	.num_wins            = 8,
+	.num_remappable_wins = 4,
+	.win_cfg_offset      = orion_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = orion5x_map,
+};
+
+static const struct mvebu_mbus_soc_data orion5x_2win_mbus_data = {
+	.num_wins            = 8,
+	.num_remappable_wins = 2,
+	.win_cfg_offset      = orion_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = orion5x_map,
+};
+
+static const struct mvebu_mbus_mapping mv78xx0_map[] = {
+	MAPDEF("pcie0.0", 4, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.1", 4, 0xd0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.2", 4, 0xb0, MAPDEF_PCIMASK),
+	MAPDEF("pcie0.3", 4, 0x70, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.0", 8, 0xe0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.1", 8, 0xd0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.2", 8, 0xb0, MAPDEF_PCIMASK),
+	MAPDEF("pcie1.3", 8, 0x70, MAPDEF_PCIMASK),
+	MAPDEF("pcie2.0", 4, 0xf0, MAPDEF_PCIMASK),
+	MAPDEF("pcie3.0", 8, 0xf0, MAPDEF_PCIMASK),
+	{},
+};
+
+static const struct mvebu_mbus_soc_data mv78xx0_mbus_data = {
+	.num_wins            = 14,
+	.num_remappable_wins = 8,
+	.win_cfg_offset      = mv78xx0_mbus_win_offset,
+	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
+	.show_cpu_target     = mvebu_sdram_debug_show_orion,
+	.map                 = mv78xx0_map,
+};
+
+/*
+ * The driver doesn't yet have a DT binding because the details of
+ * this DT binding still need to be sorted out. However, as a
+ * preparation, we already use of_device_id to match a SoC description
+ * string against the SoC specific details of this driver.
+ */
+static const struct of_device_id of_mvebu_mbus_ids[] = {
+	{ .compatible = "marvell,armada370-mbus",
+	  .data = &armada_370_mbus_data, },
+	{ .compatible = "marvell,armadaxp-mbus",
+	  .data = &armada_xp_mbus_data, },
+	{ .compatible = "marvell,kirkwood-mbus",
+	  .data = &kirkwood_mbus_data, },
+	{ .compatible = "marvell,dove-mbus",
+	  .data = &dove_mbus_data, },
+	{ .compatible = "marvell,orion5x-88f5281-mbus",
+	  .data = &orion5x_4win_mbus_data, },
+	{ .compatible = "marvell,orion5x-88f5182-mbus",
+	  .data = &orion5x_2win_mbus_data, },
+	{ .compatible = "marvell,orion5x-88f5181-mbus",
+	  .data = &orion5x_2win_mbus_data, },
+	{ .compatible = "marvell,orion5x-88f6183-mbus",
+	  .data = &orion5x_4win_mbus_data, },
+	{ .compatible = "marvell,mv78xx0-mbus",
+	  .data = &mv78xx0_mbus_data, },
+	{ },
+};
+
+/*
+ * Public API of the driver
+ */
+int mvebu_mbus_add_window_remap_flags(const char *devname, phys_addr_t base,
+				      size_t size, phys_addr_t remap,
+				      unsigned int flags)
+{
+	struct mvebu_mbus_state *s = &mbus_state;
+	u8 target, attr;
+	int i;
+
+	if (!s->soc->map)
+		return -ENODEV;
+
+	for (i = 0; s->soc->map[i].name; i++)
+		if (!strcmp(s->soc->map[i].name, devname))
+			break;
+
+	if (!s->soc->map[i].name) {
+		pr_err("mvebu-mbus: unknown device '%s'\n", devname);
+		return -ENODEV;
+	}
+
+	target = s->soc->map[i].target;
+	attr   = s->soc->map[i].attr;
+
+	if (flags == MVEBU_MBUS_PCI_MEM)
+		attr |= 0x8;
+	else if (flags == MVEBU_MBUS_PCI_WA)
+		attr |= 0x28;
+
+	if (!mvebu_mbus_window_conflicts(s, base, size, target, attr)) {
+		pr_err("mvebu-mbus: cannot add window '%s', conflicts with another window\n",
+		       devname);
+		return -EINVAL;
+	}
+
+	return mvebu_mbus_alloc_window(s, base, size, remap, target, attr);
+
+}
+
+int mvebu_mbus_add_window(const char *devname, phys_addr_t base, size_t size)
+{
+	return mvebu_mbus_add_window_remap_flags(devname, base, size,
+						 MVEBU_MBUS_NO_REMAP, 0);
+}
+
+int mvebu_mbus_del_window(phys_addr_t base, size_t size)
+{
+	int win;
+
+	win = mvebu_mbus_find_window(&mbus_state, base, size);
+	if (win < 0)
+		return win;
+
+	mvebu_mbus_disable_window(&mbus_state, win);
+	return 0;
+}
+
+static __init int mvebu_mbus_debugfs_init(void)
+{
+	struct mvebu_mbus_state *s = &mbus_state;
+
+	/*
+	 * If no base has been initialized, doesn't make sense to
+	 * register the debugfs entries. We may be on a multiplatform
+	 * kernel that isn't running a Marvell EBU SoC.
+	 */
+	if (!s->mbuswins_base)
+		return 0;
+
+	s->debugfs_root = debugfs_create_dir("mvebu-mbus", NULL);
+	if (s->debugfs_root) {
+		s->debugfs_sdram = debugfs_create_file("sdram", S_IRUGO,
+						       s->debugfs_root, NULL,
+						       &mvebu_sdram_debug_fops);
+		s->debugfs_devs = debugfs_create_file("devices", S_IRUGO,
+						      s->debugfs_root, NULL,
+						      &mvebu_devs_debug_fops);
+	}
+
+	return 0;
+}
+fs_initcall(mvebu_mbus_debugfs_init);
+
+int __init mvebu_mbus_init(const char *soc, phys_addr_t mbuswins_phys_base,
+			   size_t mbuswins_size,
+			   phys_addr_t sdramwins_phys_base,
+			   size_t sdramwins_size)
+{
+	struct mvebu_mbus_state *mbus = &mbus_state;
+	const struct of_device_id *of_id;
+	int win;
+
+	for (of_id = of_mvebu_mbus_ids; of_id->compatible; of_id++)
+		if (!strcmp(of_id->compatible, soc))
+			break;
+
+	if (!of_id->compatible) {
+		pr_err("mvebu-mbus: could not find a matching SoC family\n");
+		return -ENODEV;
+	}
+
+	mbus->soc = of_id->data;
+
+	mbus->mbuswins_base = ioremap(mbuswins_phys_base, mbuswins_size);
+	if (!mbus->mbuswins_base)
+		return -ENOMEM;
+
+	mbus->sdramwins_base = ioremap(sdramwins_phys_base, sdramwins_size);
+	if (!mbus->sdramwins_base) {
+		iounmap(mbus_state.mbuswins_base);
+		return -ENOMEM;
+	}
+
+	if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+		mbus->hw_io_coherency = 1;
+
+	for (win = 0; win < mbus->soc->num_wins; win++)
+		mvebu_mbus_disable_window(mbus, win);
+
+	mbus->soc->setup_cpu_target(mbus);
+
+	return 0;
+}

include/linux/mbus.h

@@ -32,6 +32,17 @@ struct mbus_dram_target_info
 	} cs[4];
 };
 
+/* Flags for PCI/PCIe address decoding regions */
+#define MVEBU_MBUS_PCI_IO  0x1
+#define MVEBU_MBUS_PCI_MEM 0x2
+#define MVEBU_MBUS_PCI_WA  0x3
+
+/*
+ * Magic value that explicits that we don't need a remapping-capable
+ * address decoding window.
+ */
+#define MVEBU_MBUS_NO_REMAP (0xffffffff)
+
 /*
  * The Marvell mbus is to be found only on SOCs from the Orion family
  * at the moment.  Provide a dummy stub for other architectures.
@@ -44,4 +55,15 @@ static inline const struct mbus_dram_target_info *mv_mbus_dram_info(void)
 	return NULL;
 }
 #endif
-#endif
+
+int mvebu_mbus_add_window_remap_flags(const char *devname, phys_addr_t base,
+				      size_t size, phys_addr_t remap,
+				      unsigned int flags);
+int mvebu_mbus_add_window(const char *devname, phys_addr_t base,
+			  size_t size);
+int mvebu_mbus_del_window(phys_addr_t base, size_t size);
+int mvebu_mbus_init(const char *soc, phys_addr_t mbus_phys_base,
+		    size_t mbus_size, phys_addr_t sdram_phys_base,
+		    size_t sdram_size);
+
+#endif /* __LINUX_MBUS_H */