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/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/arch/mips/bcm63xx/cpu.c:
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
* Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <ram.h>
#include <asm/io.h>
#include <dm/device.h>
#define MEMC_CFG_REG 0x4
#define MEMC_CFG_32B_SHIFT 1
#define MEMC_CFG_32B_MASK (1 << MEMC_CFG_32B_SHIFT)
#define MEMC_CFG_COL_SHIFT 3
#define MEMC_CFG_COL_MASK (0x3 << MEMC_CFG_COL_SHIFT)
#define MEMC_CFG_ROW_SHIFT 6
#define MEMC_CFG_ROW_MASK (0x3 << MEMC_CFG_ROW_SHIFT)
#define DDR_CSEND_REG 0x8
struct bmips_ram_priv;
struct bmips_ram_hw {
ulong (*get_ram_size)(struct bmips_ram_priv *);
};
struct bmips_ram_priv {
void __iomem *regs;
const struct bmips_ram_hw *hw;
};
static ulong bcm6328_get_ram_size(struct bmips_ram_priv *priv)
{
return readl_be(priv->regs + DDR_CSEND_REG) << 24;
}
static ulong bcm6358_get_ram_size(struct bmips_ram_priv *priv)
{
unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
u32 val;
val = readl_be(priv->regs + MEMC_CFG_REG);
rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
banks = 2;
/* 0 => 11 address bits ... 2 => 13 address bits */
rows += 11;
/* 0 => 8 address bits ... 2 => 10 address bits */
cols += 8;
return 1 << (cols + rows + (is_32bits + 1) + banks);
}
static int bmips_ram_get_info(struct udevice *dev, struct ram_info *info)
{
struct bmips_ram_priv *priv = dev_get_priv(dev);
const struct bmips_ram_hw *hw = priv->hw;
info->base = 0x80000000;
info->size = hw->get_ram_size(priv);
return 0;
}
static const struct ram_ops bmips_ram_ops = {
.get_info = bmips_ram_get_info,
};
static const struct bmips_ram_hw bmips_ram_bcm6328 = {
.get_ram_size = bcm6328_get_ram_size,
};
static const struct bmips_ram_hw bmips_ram_bcm6358 = {
.get_ram_size = bcm6358_get_ram_size,
};
static const struct udevice_id bmips_ram_ids[] = {
{
.compatible = "brcm,bcm6328-mc",
.data = (ulong)&bmips_ram_bcm6328,
}, {
.compatible = "brcm,bcm6358-mc",
.data = (ulong)&bmips_ram_bcm6358,
}, { /* sentinel */ }
};
static int bmips_ram_probe(struct udevice *dev)
{
struct bmips_ram_priv *priv = dev_get_priv(dev);
const struct bmips_ram_hw *hw =
(const struct bmips_ram_hw *)dev_get_driver_data(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = dev_get_addr_size_index(dev, 0, &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = ioremap(addr, size);
priv->hw = hw;
return 0;
}
U_BOOT_DRIVER(bmips_ram) = {
.name = "bmips-mc",
.id = UCLASS_RAM,
.of_match = bmips_ram_ids,
.probe = bmips_ram_probe,
.priv_auto_alloc_size = sizeof(struct bmips_ram_priv),
.ops = &bmips_ram_ops,
.flags = DM_FLAG_PRE_RELOC,
};
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