linux/drivers/bus/mvebu-mbus.c
Linus Torvalds 825f4e0271 ARM: SoC updates for 3.16 (part 1)
A quite large set of SoC updates this cycle. In no particular order:
 
 - Multi-cluster power management for Samsung Exynos, adding support for
   big.LITTLE CPU switching on EXYNOS5
 - SMP support for Marvell Armada 375 and 38x
 - SMP rework on Allwinner A31
 - Xilinx Zynq support for SOC_BUS, big endian
 - Marvell orion5x platform cleanup, modernizing the implementation and
   moving to DT.
 - _Finally_ moving Samsung Exynos over to support MULTIPLATFORM, so
   that their platform can be enabled in the same kernel binary as most
   of the other v7 platforms in the tree. \o/ The work isn't quite complete,
   there's some driver fixes still needed, but the basics now work.
 
 New SoC support added:
 - Freescale i.MX6SX
 - LSI Axxia AXM55xx SoCs
 - Samsung EXYNOS 3250, 5260, 5410, 5420 and 5800
 - STi STIH407
 
 Plus a large set of various smaller updates for different platforms. I'm
 probably missing some important one here.
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Merge tag 'soc-for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into next

Pull part one of ARM SoC updates from Olof Johansson:
 "A quite large set of SoC updates this cycle.  In no particular order:

   - Multi-cluster power management for Samsung Exynos, adding support
     for big.LITTLE CPU switching on EXYNOS5

   - SMP support for Marvell Armada 375 and 38x

   - SMP rework on Allwinner A31

   - Xilinx Zynq support for SOC_BUS, big endian

   - Marvell orion5x platform cleanup, modernizing the implementation
     and moving to DT.

   - _Finally_ moving Samsung Exynos over to support MULTIPLATFORM, so
     that their platform can be enabled in the same kernel binary as
     most of the other v7 platforms in the tree.  \o/

     The work isn't quite complete, there's some driver fixes still
     needed, but the basics now work.

  New SoC support added:

   - Freescale i.MX6SX

   - LSI Axxia AXM55xx SoCs

   - Samsung EXYNOS 3250, 5260, 5410, 5420 and 5800

   - STi STIH407

  plus a large set of various smaller updates for different platforms.
  I'm probably missing some important one here"

* tag 'soc-for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (281 commits)
  ARM: exynos: don't run exynos4 l2x0 setup on other platforms
  ARM: exynos: Fix "allmodconfig" build errors in mcpm and hotplug
  ARM: EXYNOS: mcpm rename the power_down_finish
  ARM: EXYNOS: Enable mcpm for dual-cluster exynos5800 SoC
  ARM: EXYNOS: Enable multi-platform build support
  ARM: EXYNOS: Consolidate Kconfig entries
  ARM: EXYNOS: Add support for EXYNOS5410 SoC
  ARM: EXYNOS: Support secondary CPU boot of Exynos3250
  ARM: EXYNOS: Add Exynos3250 SoC ID
  ARM: EXYNOS: Add 5800 SoC support
  ARM: EXYNOS: initial board support for exynos5260 SoC
  clk: exynos5410: register clocks using common clock framework
  ARM: debug: qcom: add UART addresses to Kconfig help for APQ8084
  ARM: sunxi: allow building without reset controller
  Documentation: devicetree: arm: sort enable-method entries
  ARM: rockchip: convert smp bringup to CPU_METHOD_OF_DECLARE
  clk: exynos5250: Add missing sysmmu clocks for DISP and ISP blocks
  ARM: dts: axxia: Add reset controller
  power: reset: Add Axxia system reset driver
  ARM: axxia: Adding defconfig for AXM55xx
  ...
2014-06-02 16:15:12 -07:00

944 lines
25 KiB
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_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>
/*
* 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);
int (*show_cpu_target)(struct mvebu_mbus_state *s,
struct seq_file *seq, void *v);
};
struct mvebu_mbus_state {
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 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;
}
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;
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;
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 (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_soc_data armada_370_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,
};
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,
};
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,
};
/*
* 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,
};
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,
};
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,
};
static const struct of_device_id of_mvebu_mbus_ids[] = {
{ .compatible = "marvell,armada370-mbus",
.data = &armada_370_xp_mbus_data, },
{ .compatible = "marvell,armadaxp-mbus",
.data = &armada_370_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 __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)
{
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;
}
for (win = 0; win < mbus->soc->num_wins; win++)
mvebu_mbus_disable_window(mbus, win);
mbus->soc->setup_cpu_target(mbus);
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);
}
#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;
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;
}
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));
if (ret)
return ret;
/* Setup statically declared windows in the DT */
return mbus_dt_setup(&mbus_state, np);
}
#endif