u-boot/arch/arm/mach-mvebu/mbus.c

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/*
* Address map functions for Marvell EBU SoCs (Kirkwood, Armada
* 370/XP, Dove, Orion5x and MV78xx0)
*
* Ported from the Barebox version to U-Boot by:
* Stefan Roese <sr@denx.de>
*
* The Barebox version is:
* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
*
* based on mbus driver from Linux
* (C) Copyright 2008 Marvell Semiconductor
*
* SPDX-License-Identifier: GPL-2.0
*
* 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().
*/
#include <common.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <linux/log2.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 mbus_state
__attribute__ ((section(".data")));
static struct mbus_dram_target_info mbus_dram_info
__attribute__ ((section(".data")));
/*
* 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 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);
w->base = base & DDR_BASE_CS_LOW_MASK;
w->size = (size | ~DDR_SIZE_MASK) + 1;
}
}
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
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,
};
/*
* 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)) {
printf("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;
}
static void mvebu_mbus_get_lowest_base(struct mvebu_mbus_state *mbus,
phys_addr_t *base)
{
int win;
*base = 0xffffffff;
for (win = 0; win < mbus->soc->num_wins; win++) {
u64 wbase;
u32 wsize;
u8 wtarget, wattr;
int enabled;
mvebu_mbus_read_window(mbus, win,
&enabled, &wbase, &wsize,
&wtarget, &wattr, NULL);
if (!enabled)
continue;
if (wbase < *base)
*base = wbase;
}
}
static void mvebu_config_mbus_bridge(struct mvebu_mbus_state *mbus)
{
phys_addr_t base;
u32 val;
u32 size;
/* Set MBUS bridge base/ctrl */
mvebu_mbus_get_lowest_base(&mbus_state, &base);
size = 0xffffffff - base + 1;
if (!is_power_of_2(size)) {
/* Round up to next power of 2 */
size = 1 << (ffs(base) + 1);
base = 0xffffffff - size + 1;
}
/* Now write base and size */
writel(base, MBUS_BRIDGE_WIN_BASE_REG);
/* Align window size to 64KiB */
val = (size / (64 << 10)) - 1;
writel((val << 16) | 0x1, MBUS_BRIDGE_WIN_CTRL_REG);
}
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)) {
printf("Cannot add window '%04x:%04x', conflicts with another window\n",
target, attr);
return -EBUSY;
}
/*
* In U-Boot we first try to add the mbus window to the remap windows.
* If this fails, lets try to add the windows to the non-remap windows.
*/
if (mvebu_mbus_alloc_window(mbus, base, size, base, target, attr)) {
if (mvebu_mbus_alloc_window(mbus, base, size,
MVEBU_MBUS_NO_REMAP, target, attr))
return -ENOMEM;
}
/*
* Re-configure the mbus bridge registers each time this function
* is called. Since it may get called from the board code in
* later boot stages as well.
*/
mvebu_config_mbus_bridge(mbus);
return 0;
}
int mvebu_mbus_probe(struct mbus_win windows[], int count)
{
int win;
int ret;
int i;
#if defined(CONFIG_KIRKWOOD)
mbus_state.soc = &kirkwood_mbus_data;
#endif
#if defined(CONFIG_ARCH_MVEBU)
mbus_state.soc = &armada_370_xp_mbus_data;
#endif
mbus_state.mbuswins_base = (void __iomem *)MVEBU_CPU_WIN_BASE;
mbus_state.sdramwins_base = (void __iomem *)MVEBU_SDRAM_BASE;
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 */
for (i = 0; i < count; i++) {
u32 base, size;
u8 target, attr;
target = windows[i].target;
attr = windows[i].attr;
base = windows[i].base;
size = windows[i].size;
ret = mbus_dt_setup_win(&mbus_state, base, size, target, attr);
if (ret < 0)
return ret;
}
return 0;
}