--- /dev/null
+/*
+ * 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_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').
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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>
+#include <linux/log2.h>
+#include <linux/syscore_ops.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)
+/* Only on HW I/O coherency capable platforms */
+#define WIN_CTRL_SYNCBARRIER BIT(1)
+#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 UNIT_SYNC_BARRIER_OFF 0x84
+#define UNIT_SYNC_BARRIER_ALL 0xFFFF
+
+#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)
+
+/* Relative to mbusbridge_base */
+#define MBUS_BRIDGE_CTRL_OFF 0x0
+#define MBUS_BRIDGE_BASE_OFF 0x4
+
+/* Maximum number of windows, for all known platforms */
+#define MBUS_WINS_MAX 20
+
+struct mvebu_mbus_state;
+
+struct mvebu_mbus_soc_data {
+ unsigned int num_wins;
+ bool has_mbus_bridge;
+ unsigned int (*win_cfg_offset)(const int win);
+ unsigned int (*win_remap_offset)(const int win);
+ void (*setup_cpu_target)(struct mvebu_mbus_state *s);
+ int (*save_cpu_target)(struct mvebu_mbus_state *s,
+ u32 *store_addr);
+ int (*show_cpu_target)(struct mvebu_mbus_state *s,
+ struct seq_file *seq, void *v);
+};
+
+/*
+ * Used to store the state of one MBus window accross suspend/resume.
+ */
+struct mvebu_mbus_win_data {
+ u32 ctrl;
+ u32 base;
+ u32 remap_lo;
+ u32 remap_hi;
+};
+
+struct mvebu_mbus_state {
+ void __iomem *mbuswins_base;
+ void __iomem *sdramwins_base;
+ void __iomem *mbusbridge_base;
+ phys_addr_t sdramwins_phys_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;
+
+ /* Used during suspend/resume */
+ u32 mbus_bridge_ctrl;
+ u32 mbus_bridge_base;
+ struct mvebu_mbus_win_data wins[MBUS_WINS_MAX];
+};
+
+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);
+
+/* Checks whether the given window has remap capability */
+static bool mvebu_mbus_window_is_remappable(struct mvebu_mbus_state *mbus,
+ const int win)
+{
+ return mbus->soc->win_remap_offset(win) != MVEBU_MBUS_NO_REMAP;
+}
+
+/*
+ * 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 (mvebu_mbus_window_is_remappable(mbus, win)) {
+ u32 remap_low, remap_hi;
+ void __iomem *addr_rmp = mbus->mbuswins_base +
+ mbus->soc->win_remap_offset(win);
+ remap_low = readl(addr_rmp + WIN_REMAP_LO_OFF);
+ remap_hi = readl(addr_rmp + 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 (mvebu_mbus_window_is_remappable(mbus, win)) {
+ addr = mbus->mbuswins_base + mbus->soc->win_remap_offset(win);
+ 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;
+ }
+
+ 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;
+
+ if (!is_power_of_2(size)) {
+ WARN(true, "Invalid MBus window size: 0x%zx\n", size);
+ return -EINVAL;
+ }
+
+ if ((base & (phys_addr_t)(size - 1)) != 0) {
+ WARN(true, "Invalid MBus base/size: %pa len 0x%zx\n", &base,
+ size);
+ return -EINVAL;
+ }
+
+ ctrl = ((size - 1) & WIN_CTRL_SIZE_MASK) |
+ (attr << WIN_CTRL_ATTR_SHIFT) |
+ (target << WIN_CTRL_TGT_SHIFT) |
+ WIN_CTRL_ENABLE;
+ if (mbus->hw_io_coherency)
+ ctrl |= WIN_CTRL_SYNCBARRIER;
+
+ writel(base & WIN_BASE_LOW, addr + WIN_BASE_OFF);
+ writel(ctrl, addr + WIN_CTRL_OFF);
+
+ if (mvebu_mbus_window_is_remappable(mbus, win)) {
+ void __iomem *addr_rmp = mbus->mbuswins_base +
+ mbus->soc->win_remap_offset(win);
+
+ if (remap == MVEBU_MBUS_NO_REMAP)
+ remap_addr = base;
+ else
+ remap_addr = remap;
+ writel(remap_addr & WIN_REMAP_LOW, addr_rmp + WIN_REMAP_LO_OFF);
+ writel(0, addr_rmp + 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 = 0; win < mbus->soc->num_wins; win++) {
+ if (mvebu_mbus_window_is_remappable(mbus, win))
+ continue;
+
+ 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++) {
+ /* Skip window if need remap but is not supported */
+ if ((remap != MVEBU_MBUS_NO_REMAP) &&
+ !mvebu_mbus_window_is_remappable(mbus, win))
+ continue;
+
+ 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;
+
+ mvebu_mbus_read_window(mbus, win,
+ &enabled, &wbase, &wsize,
+ &wtarget, &wattr, &wremap);
+
+ if (!enabled) {
+ seq_printf(seq, "[%02d] disabled\n", win);
+ continue;
+ }
+
+ seq_printf(seq, "[%02d] %016llx - %016llx : %04x:%04x",
+ win, (unsigned long long)wbase,
+ (unsigned long long)(wbase + wsize), wtarget, wattr);
+
+ if (!is_power_of_2(wsize) ||
+ ((wbase & (u64)(wsize - 1)) != 0))
+ seq_puts(seq, " (Invalid base/size!!)");
+
+ if (mvebu_mbus_window_is_remappable(mbus, win)) {
+ 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 generic_mbus_win_cfg_offset(int win)
+{
+ return win << 4;
+}
+
+static unsigned int armada_370_xp_mbus_win_cfg_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_cfg_offset(int win)
+{
+ if (win < 8)
+ return win << 4;
+ else
+ return 0x900 + ((win - 8) << 4);
+}
+
+static unsigned int generic_mbus_win_remap_2_offset(int win)
+{
+ if (win < 2)
+ return generic_mbus_win_cfg_offset(win);
+ else
+ return MVEBU_MBUS_NO_REMAP;
+}
+
+static unsigned int generic_mbus_win_remap_4_offset(int win)
+{
+ if (win < 4)
+ return generic_mbus_win_cfg_offset(win);
+ else
+ return MVEBU_MBUS_NO_REMAP;
+}
+
+static unsigned int generic_mbus_win_remap_8_offset(int win)
+{
+ if (win < 8)
+ return generic_mbus_win_cfg_offset(win);
+ else
+ return MVEBU_MBUS_NO_REMAP;
+}
+
+static unsigned int armada_xp_mbus_win_remap_offset(int win)
+{
+ if (win < 8)
+ return generic_mbus_win_cfg_offset(win);
+ else if (win == 13)
+ return 0xF0 - WIN_REMAP_LO_OFF;
+ else
+ return MVEBU_MBUS_NO_REMAP;
+}
+
+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 int
+mvebu_mbus_default_save_cpu_target(struct mvebu_mbus_state *mbus,
+ u32 *store_addr)
+{
+ int i;
+
+ for (i = 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));
+
+ writel(mbus->sdramwins_phys_base + DDR_BASE_CS_OFF(i),
+ store_addr++);
+ writel(base, store_addr++);
+ writel(mbus->sdramwins_phys_base + DDR_SIZE_CS_OFF(i),
+ store_addr++);
+ writel(size, store_addr++);
+ }
+
+ /* We've written 16 words to the store address */
+ return 16;
+}
+
+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 int
+mvebu_mbus_dove_save_cpu_target(struct mvebu_mbus_state *mbus,
+ u32 *store_addr)
+{
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ u32 map = readl(mbus->sdramwins_base + DOVE_DDR_BASE_CS_OFF(i));
+
+ writel(mbus->sdramwins_phys_base + DOVE_DDR_BASE_CS_OFF(i),
+ store_addr++);
+ writel(map, store_addr++);
+ }
+
+ /* We've written 4 words to the store address */
+ return 4;
+}
+
+int mvebu_mbus_save_cpu_target(u32 *store_addr)
+{
+ return mbus_state.soc->save_cpu_target(&mbus_state, store_addr);
+}
+
+static const struct mvebu_mbus_soc_data armada_370_mbus_data = {
+ .num_wins = 20,
+ .has_mbus_bridge = true,
+ .win_cfg_offset = armada_370_xp_mbus_win_cfg_offset,
+ .win_remap_offset = generic_mbus_win_remap_8_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+};
+
+static const struct mvebu_mbus_soc_data armada_xp_mbus_data = {
+ .num_wins = 20,
+ .has_mbus_bridge = true,
+ .win_cfg_offset = armada_370_xp_mbus_win_cfg_offset,
+ .win_remap_offset = armada_xp_mbus_win_remap_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+};
+
+static const struct mvebu_mbus_soc_data kirkwood_mbus_data = {
+ .num_wins = 8,
+ .win_cfg_offset = generic_mbus_win_cfg_offset,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+ .win_remap_offset = generic_mbus_win_remap_4_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+};
+
+static const struct mvebu_mbus_soc_data dove_mbus_data = {
+ .num_wins = 8,
+ .win_cfg_offset = generic_mbus_win_cfg_offset,
+ .save_cpu_target = mvebu_mbus_dove_save_cpu_target,
+ .win_remap_offset = generic_mbus_win_remap_4_offset,
+ .setup_cpu_target = mvebu_mbus_dove_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_dove,
+};
+
+/*
+ * 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,
+ .win_cfg_offset = generic_mbus_win_cfg_offset,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+ .win_remap_offset = generic_mbus_win_remap_4_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+};
+
+static const struct mvebu_mbus_soc_data orion5x_2win_mbus_data = {
+ .num_wins = 8,
+ .win_cfg_offset = generic_mbus_win_cfg_offset,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+ .win_remap_offset = generic_mbus_win_remap_2_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+};
+
+static const struct mvebu_mbus_soc_data mv78xx0_mbus_data = {
+ .num_wins = 14,
+ .win_cfg_offset = mv78xx0_mbus_win_cfg_offset,
+ .save_cpu_target = mvebu_mbus_default_save_cpu_target,
+ .win_remap_offset = generic_mbus_win_remap_8_offset,
+ .setup_cpu_target = mvebu_mbus_default_setup_cpu_target,
+ .show_cpu_target = mvebu_sdram_debug_show_orion,
+};
+
+static const struct of_device_id of_mvebu_mbus_ids[] = {
+ { .compatible = "marvell,armada370-mbus",
+ .data = &armada_370_mbus_data, },
+ { .compatible = "marvell,armada375-mbus",
+ .data = &armada_xp_mbus_data, },
+ { .compatible = "marvell,armada380-mbus",
+ .data = &armada_xp_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_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)) {
+ pr_err("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;
+}
+
+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);
+
+static int mvebu_mbus_suspend(void)
+{
+ struct mvebu_mbus_state *s = &mbus_state;
+ int win;
+
+ if (!s->mbusbridge_base)
+ return -ENODEV;
+
+ for (win = 0; win < s->soc->num_wins; win++) {
+ void __iomem *addr = s->mbuswins_base +
+ s->soc->win_cfg_offset(win);
+ void __iomem *addr_rmp;
+
+ s->wins[win].base = readl(addr + WIN_BASE_OFF);
+ s->wins[win].ctrl = readl(addr + WIN_CTRL_OFF);
+
+ if (!mvebu_mbus_window_is_remappable(s, win))
+ continue;
+
+ addr_rmp = s->mbuswins_base +
+ s->soc->win_remap_offset(win);
+
+ s->wins[win].remap_lo = readl(addr_rmp + WIN_REMAP_LO_OFF);
+ s->wins[win].remap_hi = readl(addr_rmp + WIN_REMAP_HI_OFF);
+ }
+
+ s->mbus_bridge_ctrl = readl(s->mbusbridge_base +
+ MBUS_BRIDGE_CTRL_OFF);
+ s->mbus_bridge_base = readl(s->mbusbridge_base +
+ MBUS_BRIDGE_BASE_OFF);
+
+ return 0;
+}
+
+static void mvebu_mbus_resume(void)
+{
+ struct mvebu_mbus_state *s = &mbus_state;
+ int win;
+
+ writel(s->mbus_bridge_ctrl,
+ s->mbusbridge_base + MBUS_BRIDGE_CTRL_OFF);
+ writel(s->mbus_bridge_base,
+ s->mbusbridge_base + MBUS_BRIDGE_BASE_OFF);
+
+ for (win = 0; win < s->soc->num_wins; win++) {
+ void __iomem *addr = s->mbuswins_base +
+ s->soc->win_cfg_offset(win);
+ void __iomem *addr_rmp;
+
+ writel(s->wins[win].base, addr + WIN_BASE_OFF);
+ writel(s->wins[win].ctrl, addr + WIN_CTRL_OFF);
+
+ if (!mvebu_mbus_window_is_remappable(s, win))
+ continue;
+
+ addr_rmp = s->mbuswins_base +
+ s->soc->win_remap_offset(win);
+
+ writel(s->wins[win].remap_lo, addr_rmp + WIN_REMAP_LO_OFF);
+ writel(s->wins[win].remap_hi, addr_rmp + WIN_REMAP_HI_OFF);
+ }
+}
+
+struct syscore_ops mvebu_mbus_syscore_ops = {
+ .suspend = mvebu_mbus_suspend,
+ .resume = mvebu_mbus_resume,
+};
+
+static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
+ phys_addr_t mbuswins_phys_base,
+ size_t mbuswins_size,
+ phys_addr_t sdramwins_phys_base,
+ size_t sdramwins_size,
+ phys_addr_t mbusbridge_phys_base,
+ size_t mbusbridge_size,
+ bool is_coherent)
+{
+ int win;
+
+ 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;
+ }
+
+ mbus->sdramwins_phys_base = sdramwins_phys_base;
+
+ if (mbusbridge_phys_base) {
+ mbus->mbusbridge_base = ioremap(mbusbridge_phys_base,
+ mbusbridge_size);
+ if (!mbus->mbusbridge_base) {
+ iounmap(mbus->sdramwins_base);
+ iounmap(mbus->mbuswins_base);
+ return -ENOMEM;
+ }
+ } else
+ mbus->mbusbridge_base = NULL;
+
+ for (win = 0; win < mbus->soc->num_wins; win++)
+ mvebu_mbus_disable_window(mbus, win);
+
+ mbus->soc->setup_cpu_target(mbus);
+
+ if (is_coherent)
+ writel(UNIT_SYNC_BARRIER_ALL,
+ mbus->mbuswins_base + UNIT_SYNC_BARRIER_OFF);
+
+ register_syscore_ops(&mvebu_mbus_syscore_ops);
+
+ return 0;
+}
+
+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)
+{
+ const struct of_device_id *of_id;
+
+ for (of_id = of_mvebu_mbus_ids; of_id->compatible[0]; of_id++)
+ if (!strcmp(of_id->compatible, soc))
+ break;
+
+ if (!of_id->compatible[0]) {
+ pr_err("could not find a matching SoC family\n");
+ return -ENODEV;
+ }
+
+ mbus_state.soc = of_id->data;
+
+ return mvebu_mbus_common_init(&mbus_state,
+ mbuswins_phys_base,
+ mbuswins_size,
+ sdramwins_phys_base,
+ sdramwins_size, 0, 0, false);
+}
+
+#ifdef CONFIG_OF
+/*
+ * 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 __init 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)) {
+ pr_err("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)) {
+ pr_err("cannot add window '%04x:%04x', too many windows\n",
+ target, attr);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int __init
+mbus_parse_ranges(struct device_node *node,
+ int *addr_cells, int *c_addr_cells, int *c_size_cells,
+ int *cell_count, const __be32 **ranges_start,
+ const __be32 **ranges_end)
+{
+ 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) {
+ pr_warn("malformed ranges entry '%s'\n", node->name);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int __init mbus_dt_setup(struct mvebu_mbus_state *mbus,
+ struct device_node *np)
+{
+ 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(np, &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 __init 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] - 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] - 1;
+ io->flags = IORESOURCE_IO;
+ }
+}
+
+int __init mvebu_mbus_dt_init(bool is_coherent)
+{
+ struct resource mbuswins_res, sdramwins_res, mbusbridge_res;
+ struct device_node *np, *controller;
+ const struct of_device_id *of_id;
+ const __be32 *prop;
+ int ret;
+
+ np = of_find_matching_node_and_match(NULL, of_mvebu_mbus_ids, &of_id);
+ if (!np) {
+ pr_err("could not find a matching SoC family\n");
+ return -ENODEV;
+ }
+
+ mbus_state.soc = of_id->data;
+
+ prop = of_get_property(np, "controller", NULL);
+ if (!prop) {
+ pr_err("required 'controller' property missing\n");
+ return -EINVAL;
+ }
+
+ controller = of_find_node_by_phandle(be32_to_cpup(prop));
+ if (!controller) {
+ pr_err("could not find an 'mbus-controller' node\n");
+ return -ENODEV;
+ }
+
+ if (of_address_to_resource(controller, 0, &mbuswins_res)) {
+ pr_err("cannot get MBUS register address\n");
+ return -EINVAL;
+ }
+
+ if (of_address_to_resource(controller, 1, &sdramwins_res)) {
+ pr_err("cannot get SDRAM register address\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Set the resource to 0 so that it can be left unmapped by
+ * mvebu_mbus_common_init() if the DT doesn't carry the
+ * necessary information. This is needed to preserve backward
+ * compatibility.
+ */
+ memset(&mbusbridge_res, 0, sizeof(mbusbridge_res));
+
+ if (mbus_state.soc->has_mbus_bridge) {
+ if (of_address_to_resource(controller, 2, &mbusbridge_res))
+ pr_warn(FW_WARN "deprecated mbus-mvebu Device Tree, suspend/resume will not work\n");
+ }
+
+ mbus_state.hw_io_coherency = is_coherent;
+
+ /* Get optional pcie-{mem,io}-aperture properties */
+ mvebu_mbus_get_pcie_resources(np, &mbus_state.pcie_mem_aperture,
+ &mbus_state.pcie_io_aperture);
+
+ ret = mvebu_mbus_common_init(&mbus_state,
+ mbuswins_res.start,
+ resource_size(&mbuswins_res),
+ sdramwins_res.start,
+ resource_size(&sdramwins_res),
+ mbusbridge_res.start,
+ resource_size(&mbusbridge_res),
+ is_coherent);
+ if (ret)
+ return ret;
+
+ /* Setup statically declared windows in the DT */
+ return mbus_dt_setup(&mbus_state, np);
+}
+#endif
Code Review / kvmfornfv.git / blobdiff