[PATCH v2 3/7] bus: mvebu: add mbus driver
Sebastian Hesselbarth
sebastian.hesselbarth at gmail.com
Fri Feb 7 12:41:56 EST 2014
This imports the Marvell mbus driver from Linux. The mbus is the
main downstream bus found on all Marvell Orion SoCs. The driver
deals with re-configurable address windows which are currently
parsed from DT. Also enable the driver as default on all MVEBU
SoCs. While at it, also reorder drivers/bus/{Kconfig,Makefile}
alphabetically.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Changelog:
v1-v2:
- add device_d to struct and use dev_foo instead of pr_foo
(Suggested by Sascha Hauer)
- add __maybe_unused even to static const soc_data
(Suggested by Sascha Hauer)
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Cc: Michael Grzeschik <mgr at pengutronix.de>
Cc: barebox at lists.infradead.org
---
arch/arm/Kconfig | 1 +
drivers/bus/Kconfig | 15 +-
drivers/bus/Makefile | 5 +-
drivers/bus/mvebu-mbus.c | 743 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/mbus.h | 61 ++++
5 files changed, 819 insertions(+), 6 deletions(-)
create mode 100644 drivers/bus/mvebu-mbus.c
create mode 100644 include/linux/mbus.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 93619d5c0542..32878d4d3eac 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -87,6 +87,7 @@ config ARCH_MVEBU
select CLKDEV_LOOKUP
select GPIOLIB
select HAS_DEBUG_LL
+ select MVEBU_MBUS
select OFTREE
config ARCH_MXS
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b0d3c1fe9da3..202df59762e8 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -1,13 +1,20 @@
menu "Bus devices"
-config IMX_WEIM
- depends on ARCH_IMX
- bool "i.MX WEIM driver"
-
config BUS_OMAP_GPMC
depends on ARCH_OMAP
depends on OFDEVICE
depends on OMAP_GPMC
bool "TI OMAP/AM33xx GPMC support"
+config IMX_WEIM
+ depends on ARCH_IMX
+ bool "i.MX WEIM driver"
+
+config MVEBU_MBUS
+ bool
+ depends on ARCH_MVEBU
+ help
+ Driver needed for the MBus configuration on Marvell EBU SoCs
+ (Kirkwood, Dove, Orion5x, MV78XX0 and Armada 370/XP).
+
endmenu
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index f1c5ac73ca42..4b7aa888aba8 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -1,2 +1,3 @@
-obj-$(CONFIG_IMX_WEIM) += imx-weim.o
-obj-$(CONFIG_BUS_OMAP_GPMC) += omap-gpmc.o
+obj-$(CONFIG_BUS_OMAP_GPMC) += omap-gpmc.o
+obj-$(CONFIG_IMX_WEIM) += imx-weim.o
+obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
new file mode 100644
index 000000000000..11e3777a6094
--- /dev/null
+++ b/drivers/bus/mvebu-mbus.c
@@ -0,0 +1,743 @@
+/*
+ * Address map functions for Marvell EBU SoCs (Kirkwood, Armada
+ * 370/XP, Dove, Orion5x and MV78xx0)
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
+ *
+ * based on mbus driver from Linux
+ * (C) Copyright 2008 Marvell Semiconductor
+ *
+ * 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 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_by_id(),
+ * mvebu_mbus_add_window_remap_by_id() and
+ * mvebu_mbus_del_window().
+ *
+ * - 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 <common.h>
+#include <init.h>
+#include <io.h>
+#include <of.h>
+#include <of_address.h>
+#include <linux/mbus.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_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);
+};
+
+struct mvebu_mbus_state {
+ struct device_d *dev;
+ void __iomem *mbuswins_base;
+ void __iomem *sdramwins_base;
+ struct dentry *debugfs_root;
+ struct dentry *debugfs_sdram;
+ struct dentry *debugfs_devs;
+ struct resource pcie_mem_aperture;
+ struct resource pcie_io_aperture;
+ const struct mvebu_mbus_soc_data *soc;
+ int hw_io_coherency;
+};
+
+static struct mvebu_mbus_state mbus_state;
+static struct mbus_dram_target_info 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;
+}
+
+/*
+ * SoC-specific functions and definitions
+ */
+
+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 orion5x_mbus_win_offset(int win)
+{
+ return win << 4;
+}
+
+static unsigned int mv78xx0_mbus_win_offset(int win)
+{
+ if (win < 8)
+ return win << 4;
+ else
+ return 0x900 + ((win - 8) << 4);
+}
+
+static void mvebu_mbus_default_setup_cpu_target(struct mvebu_mbus_state *mbus)
+{
+ int i;
+ int cs;
+
+ 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 = &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;
+ }
+ }
+ mbus_dram_info.num_cs = cs;
+}
+
+static void mvebu_mbus_dove_setup_cpu_target(struct mvebu_mbus_state *mbus)
+{
+ int i;
+ int cs;
+
+ 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 = &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);
+ }
+ }
+
+ mbus_dram_info.num_cs = cs;
+}
+
+static const struct mvebu_mbus_soc_data
+armada_370_xp_mbus_data __maybe_unused = {
+ .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,
+};
+
+static const struct mvebu_mbus_soc_data
+dove_mbus_data __maybe_unused = {
+ .num_wins = 8,
+ .num_remappable_wins = 4,
+ .win_cfg_offset = orion5x_mbus_win_offset,
+ .setup_cpu_target = mvebu_mbus_dove_setup_cpu_target,
+};
+
+static const struct mvebu_mbus_soc_data
+kirkwood_mbus_data __maybe_unused = {
+ .num_wins = 8,
+ .num_remappable_wins = 4,
+ .win_cfg_offset = orion5x_mbus_win_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+};
+
+/*
+ * 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 __maybe_unused = {
+ .num_wins = 8,
+ .num_remappable_wins = 4,
+ .win_cfg_offset = orion5x_mbus_win_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+};
+
+static const struct mvebu_mbus_soc_data
+orion5x_2win_mbus_data__maybe_unused = {
+ .num_wins = 8,
+ .num_remappable_wins = 2,
+ .win_cfg_offset = orion5x_mbus_win_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+};
+
+static const struct mvebu_mbus_soc_data
+mv78xx0_mbus_data __maybe_unused = {
+ .num_wins = 14,
+ .num_remappable_wins = 8,
+ .win_cfg_offset = mv78xx0_mbus_win_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+};
+
+static struct of_device_id mvebu_mbus_dt_ids[] = {
+#if defined(CONFIG_ARCH_ARMADA_370) || defined(CONFIG_ARCH_ARMADA_XP)
+ { .compatible = "marvell,armada370-mbus",
+ .data = (u32)&armada_370_xp_mbus_data, },
+ { .compatible = "marvell,armadaxp-mbus",
+ .data = (u32)&armada_370_xp_mbus_data, },
+#endif
+#if defined(CONFIG_ARCH_DOVE)
+ { .compatible = "marvell,dove-mbus",
+ .data = (u32)&dove_mbus_data, },
+#endif
+#if defined(CONFIG_ARCH_KIRKWOOD)
+ { .compatible = "marvell,kirkwood-mbus",
+ .data = (u32)&kirkwood_mbus_data, },
+#endif
+#if defined(CONFIG_ARCH_ORION5X)
+ { .compatible = "marvell,orion5x-88f5281-mbus",
+ .data = (u32)&orion5x_4win_mbus_data, },
+ { .compatible = "marvell,orion5x-88f5182-mbus",
+ .data = (u32)&orion5x_2win_mbus_data, },
+ { .compatible = "marvell,orion5x-88f5181-mbus",
+ .data = (u32)&orion5x_2win_mbus_data, },
+ { .compatible = "marvell,orion5x-88f6183-mbus",
+ .data = (u32)&orion5x_4win_mbus_data, },
+#endif
+#if defined(CONFIG_ARCH_MV78XX0)
+ { .compatible = "marvell,mv78xx0-mbus",
+ .data = (u32)&mv78xx0_mbus_data, },
+#endif
+ { },
+};
+
+/*
+ * Public API of the driver
+ */
+const struct mbus_dram_target_info *mvebu_mbus_dram_info(void)
+{
+ return &mbus_dram_info;
+}
+
+int mvebu_mbus_add_window_remap_by_id(unsigned int target,
+ unsigned int attribute,
+ phys_addr_t base, size_t size,
+ phys_addr_t remap)
+{
+ struct mvebu_mbus_state *s = &mbus_state;
+
+ if (!mvebu_mbus_window_conflicts(s, base, size, target, attribute)) {
+ dev_err(s->dev, "cannot add window '%x:%x', conflicts with another window\n",
+ target, attribute);
+ return -EINVAL;
+ }
+
+ return mvebu_mbus_alloc_window(s, base, size, remap, target, attribute);
+}
+
+int mvebu_mbus_add_window_by_id(unsigned int target, unsigned int attribute,
+ phys_addr_t base, size_t size)
+{
+ return mvebu_mbus_add_window_remap_by_id(target, attribute, base,
+ size, MVEBU_MBUS_NO_REMAP);
+}
+
+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;
+}
+
+void mvebu_mbus_get_pcie_mem_aperture(struct resource *res)
+{
+ if (!res)
+ return;
+ *res = mbus_state.pcie_mem_aperture;
+}
+
+void mvebu_mbus_get_pcie_io_aperture(struct resource *res)
+{
+ if (!res)
+ return;
+ *res = mbus_state.pcie_io_aperture;
+}
+
+/*
+ * The window IDs in the ranges DT property have the following format:
+ * - bits 28 to 31: MBus custom field
+ * - bits 24 to 27: window target ID
+ * - bits 16 to 23: window attribute ID
+ * - bits 0 to 15: unused
+ */
+#define CUSTOM(id) (((id) & 0xF0000000) >> 24)
+#define TARGET(id) (((id) & 0x0F000000) >> 24)
+#define ATTR(id) (((id) & 0x00FF0000) >> 16)
+
+static int mbus_dt_setup_win(struct mvebu_mbus_state *mbus,
+ u32 base, u32 size, u8 target, u8 attr)
+{
+ if (!mvebu_mbus_window_conflicts(mbus, base, size, target, attr)) {
+ dev_err(mbus->dev, "cannot add window '%04x:%04x', conflicts with another window\n",
+ target, attr);
+ return -EBUSY;
+ }
+
+ if (mvebu_mbus_alloc_window(mbus, base, size, MVEBU_MBUS_NO_REMAP,
+ target, attr)) {
+ dev_err(mbus->dev, "cannot add window '%04x:%04x', too many windows\n",
+ target, attr);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int mbus_parse_ranges(struct mvebu_mbus_state *mbus, int *addr_cells,
+ int *c_addr_cells, int *c_size_cells,
+ int *cell_count, const __be32 **ranges_start,
+ const __be32 **ranges_end)
+{
+ struct device_node *node = mbus->dev->device_node;
+ const __be32 *prop;
+ int ranges_len, tuple_len;
+
+ /* Allow a node with no 'ranges' property */
+ *ranges_start = of_get_property(node, "ranges", &ranges_len);
+ if (*ranges_start == NULL) {
+ *addr_cells = *c_addr_cells = *c_size_cells = *cell_count = 0;
+ *ranges_start = *ranges_end = NULL;
+ return 0;
+ }
+ *ranges_end = *ranges_start + ranges_len / sizeof(__be32);
+
+ *addr_cells = of_n_addr_cells(node);
+
+ prop = of_get_property(node, "#address-cells", NULL);
+ *c_addr_cells = be32_to_cpup(prop);
+
+ prop = of_get_property(node, "#size-cells", NULL);
+ *c_size_cells = be32_to_cpup(prop);
+
+ *cell_count = *addr_cells + *c_addr_cells + *c_size_cells;
+ tuple_len = (*cell_count) * sizeof(__be32);
+
+ if (ranges_len % tuple_len) {
+ dev_warn(mbus->dev, "malformed ranges entry '%s'\n",
+ node->name);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int mbus_dt_setup(struct mvebu_mbus_state *mbus)
+{
+ int addr_cells, c_addr_cells, c_size_cells;
+ int i, ret, cell_count;
+ const __be32 *r, *ranges_start, *ranges_end;
+
+ ret = mbus_parse_ranges(mbus, &addr_cells, &c_addr_cells,
+ &c_size_cells, &cell_count,
+ &ranges_start, &ranges_end);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0, r = ranges_start; r < ranges_end; r += cell_count, i++) {
+ u32 windowid, base, size;
+ u8 target, attr;
+
+ /*
+ * An entry with a non-zero custom field do not
+ * correspond to a static window, so skip it.
+ */
+ windowid = of_read_number(r, 1);
+ if (CUSTOM(windowid))
+ continue;
+
+ target = TARGET(windowid);
+ attr = ATTR(windowid);
+
+ base = of_read_number(r + c_addr_cells, addr_cells);
+ size = of_read_number(r + c_addr_cells + addr_cells,
+ c_size_cells);
+ ret = mbus_dt_setup_win(mbus, base, size, target, attr);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+static void mvebu_mbus_get_pcie_resources(struct device_node *np,
+ struct resource *mem, struct resource *io)
+{
+ u32 reg[2];
+ int ret;
+
+ /*
+ * These are optional, so we make sure that resource_size(x) will
+ * return 0.
+ */
+ memset(mem, 0, sizeof(struct resource));
+ mem->end = -1;
+ memset(io, 0, sizeof(struct resource));
+ io->end = -1;
+
+ ret = of_property_read_u32_array(np, "pcie-mem-aperture",
+ reg, ARRAY_SIZE(reg));
+ if (!ret) {
+ mem->start = reg[0];
+ mem->end = mem->start + reg[1];
+ mem->flags = IORESOURCE_MEM;
+ }
+
+ ret = of_property_read_u32_array(np, "pcie-io-aperture",
+ reg, ARRAY_SIZE(reg));
+ if (!ret) {
+ io->start = reg[0];
+ io->end = io->start + reg[1];
+ io->flags = IORESOURCE_IO;
+ }
+}
+
+static int mvebu_mbus_probe(struct device_d *dev)
+{
+ struct device_node *np, *controller;
+ const struct of_device_id *match;
+ const __be32 *prop;
+ int win;
+
+ mbus_state.dev = dev;
+
+ np = of_find_matching_node_and_match(NULL, mvebu_mbus_dt_ids, &match);
+ if (!np) {
+ dev_err(dev, "could not find a matching SoC family\n");
+ return -ENODEV;
+ }
+ mbus_state.soc = (struct mvebu_mbus_soc_data *)match->data;
+
+ prop = of_get_property(np, "controller", NULL);
+ if (!prop) {
+ dev_err(dev, "required 'controller' property missing\n");
+ return -EINVAL;
+ }
+
+ controller = of_find_node_by_phandle(be32_to_cpup(prop));
+ if (!controller) {
+ dev_err(dev, "could not find an 'mbus-controller' node\n");
+ return -ENODEV;
+ }
+
+ mbus_state.mbuswins_base = of_iomap(controller, 0);
+ if (!mbus_state.mbuswins_base) {
+ dev_err(dev, "cannot get MBUS register address\n");
+ return -ENOMEM;
+ }
+
+ mbus_state.sdramwins_base = of_iomap(controller, 1);
+ if (!mbus_state.sdramwins_base) {
+ dev_err(dev, "cannot get SDRAM register address\n");
+ return -ENOMEM;
+ }
+
+ /* Get optional pcie-{mem,io}-aperture properties */
+ mvebu_mbus_get_pcie_resources(np, &mbus_state.pcie_mem_aperture,
+ &mbus_state.pcie_io_aperture);
+
+ if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+ mbus_state.hw_io_coherency = 1;
+
+ for (win = 0; win < mbus_state.soc->num_wins; win++)
+ mvebu_mbus_disable_window(&mbus_state, win);
+
+ mbus_state.soc->setup_cpu_target(&mbus_state);
+
+ /* Setup statically declared windows in the DT */
+ return mbus_dt_setup(&mbus_state);
+}
+
+static struct driver_d mvebu_mbus_driver = {
+ .probe = mvebu_mbus_probe,
+ .name = "mvebu-mbus",
+ .of_compatible = DRV_OF_COMPAT(mvebu_mbus_dt_ids),
+};
+
+static int mvebu_mbus_init(void)
+{
+ return platform_driver_register(&mvebu_mbus_driver);
+}
+postcore_initcall(mvebu_mbus_init);
diff --git a/include/linux/mbus.h b/include/linux/mbus.h
new file mode 100644
index 000000000000..578ff331461c
--- /dev/null
+++ b/include/linux/mbus.h
@@ -0,0 +1,61 @@
+/*
+ * Marvell MBUS common definitions.
+ *
+ * Copyright (C) 2008 Marvell Semiconductor
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_MBUS_H
+#define __LINUX_MBUS_H
+
+struct resource;
+
+struct mbus_dram_target_info {
+ /*
+ * The 4-bit MBUS target ID of the DRAM controller.
+ */
+ u8 mbus_dram_target_id;
+
+ /*
+ * The base address, size, and MBUS attribute ID for each
+ * of the possible DRAM chip selects. Peripherals are
+ * required to support at least 4 decode windows.
+ */
+ int num_cs;
+ struct mbus_dram_window {
+ u8 cs_index;
+ u8 mbus_attr;
+ u32 base;
+ u32 size;
+ } 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)
+
+/* Maximum size of a mbus window name */
+#define MVEBU_MBUS_MAX_WINNAME_SZ 32
+
+const struct mbus_dram_target_info *mvebu_mbus_dram_info(void);
+void mvebu_mbus_get_pcie_mem_aperture(struct resource *res);
+void mvebu_mbus_get_pcie_io_aperture(struct resource *res);
+int mvebu_mbus_add_window_remap_by_id(unsigned int target,
+ unsigned int attribute,
+ phys_addr_t base, size_t size,
+ phys_addr_t remap);
+int mvebu_mbus_add_window_by_id(unsigned int target, unsigned int attribute,
+ phys_addr_t base, size_t size);
+int mvebu_mbus_del_window(phys_addr_t base, size_t size);
+
+#endif /* __LINUX_MBUS_H */
--
1.8.5.3
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