From 193030e5916960f101e1ba406510980452bc47b6 Mon Sep 17 00:00:00 2001 From: =?utf8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Tue, 25 Apr 2017 00:39:19 +0200 Subject: [PATCH] ram: add RAM driver for Broadcom MIPS SoCs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Álvaro Fernández Rojas Reviewed-by: Simon Glass --- drivers/ram/Makefile | 1 + drivers/ram/bmips_ram.c | 126 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 127 insertions(+) create mode 100644 drivers/ram/bmips_ram.c diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile index ecb036dfba..c409c480fc 100644 --- a/drivers/ram/Makefile +++ b/drivers/ram/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_RAM) += ram-uclass.o obj-$(CONFIG_SANDBOX) += sandbox_ram.o obj-$(CONFIG_STM32_SDRAM) += stm32_sdram.o +obj-$(CONFIG_ARCH_BMIPS) += bmips_ram.o diff --git a/drivers/ram/bmips_ram.c b/drivers/ram/bmips_ram.c new file mode 100644 index 0000000000..9c0b23b914 --- /dev/null +++ b/drivers/ram/bmips_ram.c @@ -0,0 +1,126 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas + * + * Derived from linux/arch/mips/bcm63xx/cpu.c: + * Copyright (C) 2008 Maxime Bizon + * Copyright (C) 2009 Florian Fainelli + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include + +#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, + }, { + .compatible = "brcm,bcm63268-mc", + .data = (ulong)&bmips_ram_bcm6328, + }, + { /* 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, +}; -- 2.25.1