[PATCH v2 1/1] drivers: misc: Add socfpga_dtreg driver for Intel SoCFPGA
Chee, Tien Fong
tien.fong.chee at intel.com
Mon Feb 5 09:38:10 CET 2024
> -----Original Message-----
> From: Lau, Wan Yee <wan.yee.lau at intel.com>
> Sent: Monday, February 5, 2024 11:47 AM
> To: u-boot at lists.denx.de
> Cc: Marek <marex at denx.de>; Simon <simon.k.r.goldschmidt at gmail.com>;
> Chee, Tien Fong <tien.fong.chee at intel.com>; Hea, Kok Kiang
> <kok.kiang.hea at intel.com>; Chong, Teik Heng <teik.heng.chong at intel.com>
> Subject: [PATCH v2 1/1] drivers: misc: Add socfpga_dtreg driver for Intel
> SoCFPGA
>
> From: Wan Yee Lau <wan.yee.lau at intel.com>
>
> Add socfpga_dtreg driver enablement for Intel SoCFPGA.
>
> Signed-off-by: Wan Yee Lau <wan.yee.lau at intel.com>
> ---
> Changes for v2:
> - Rearranged header file in socfpga_drteg.c, moved <asm/io.h> lower.
>
> arch/arm/Kconfig | 2 +
> .../misc/socfpga_dtreg.txt | 74 +++++++++++
> drivers/misc/Kconfig | 7 ++
> drivers/misc/Makefile | 1 +
> drivers/misc/socfpga_dtreg.c | 117 ++++++++++++++++++
> 5 files changed, 201 insertions(+)
> create mode 100644 doc/device-tree-bindings/misc/socfpga_dtreg.txt
> create mode 100644 drivers/misc/socfpga_dtreg.c
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index
> 531b081de9..6087345eb8 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1092,6 +1092,8 @@ config ARCH_SOCFPGA
> select SPL_LIBGENERIC_SUPPORT
> select SPL_OF_CONTROL
> select SPL_SEPARATE_BSS if TARGET_SOCFPGA_SOC64
> + select SPL_DRIVERS_MISC if TARGET_SOCFPGA_SOC64
> + select SPL_SOCFPGA_DT_REG if TARGET_SOCFPGA_SOC64
> select SPL_SERIAL
> select SPL_SYSRESET
> select SPL_WATCHDOG
> diff --git a/doc/device-tree-bindings/misc/socfpga_dtreg.txt b/doc/device-
> tree-bindings/misc/socfpga_dtreg.txt
> new file mode 100644
> index 0000000000..6057f792b9
> --- /dev/null
> +++ b/doc/device-tree-bindings/misc/socfpga_dtreg.txt
> @@ -0,0 +1,74 @@
> +* Firewall and privilege register settings in device tree
> +
> +Required properties:
> +--------------------
> +
> +- compatible: should contain "intel,socfpga-dtreg"
> +- reg: Physical base address and size of block register.
> +- intel,offset-settings: 32-bit offset address of block register,
> + followed by 32-bit value settings and
> + the masking bits, only masking bit
> + set to 1 allows modification.
> +
> +The device tree node which describes secure and privilege register
> +access configuration in compile time.
> +
> +Most of these registers are expected to work except for the case which
> +some registers configuration are required for granting access to some
> +other registers, for example CCU registers have to be properly
> +configured before allowing register configuration access to fpga2sdram
> +firewall as shown in below example.
> +
> +Some registers depend on runtime data for proper configuration are
> +expected to be part of driver that generating these data for example
> +configuration for soc_noc_fw_ddr_mpu_inst_0_ddr_scr block register
> +depend on DDR size parsed from memory device tree node.
> +
> +Please refer details of tested examples below for both fpga2sdram and
> +QoS configuration with default reset value and the comments.
> +
> +Example:
> +--------
> +
> +Configuration for multiple dtreg node support in device tree:
> +
> + socfpga_dtreg0: socfpga-dtreg0 {
> + compatible = "intel,socfpga-dtreg";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + bootph-all;
> +
> + coh_cpu0_bypass_OC_Firewall_main_Firewall at f7100200 {
> + reg = <0xf7100200 0x00000014>;
> + intel,offset-settings =
> + /* Disable ocram security at CCU for non secure
> access */
> + <0x0000004 0x8000ffff 0xe007ffff>,
> + <0x0000008 0x8000ffff 0xe007ffff>,
> + <0x000000c 0x8000ffff 0xe007ffff>,
> + <0x0000010 0x8000ffff 0xe007ffff>;
> + bootph-all;
> + };
> + };
> +
> + socfpga_dtreg1: socfpga-dtreg1 {
> + compatible = "intel,socfpga-dtreg";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + bootph-all;
> +
> + soc_noc_fw_mpfe_csr_inst_0_mpfe_scr at f8020000 {
> + reg = <0xf8020000 0x0000001c>;
> + intel,offset-settings =
> + /* Disable MPFE firewall for SMMU */
> + <0x00000000 0x00010101 0x00010101>,
> + /* Disable MPFE firewall for HMC adapter */
> + <0x00000004 0x00000001 0x00010101>;
> + bootph-all;
> + };
> + };
> +
> +To call the nodes use:
> +
> + ret = uclass_get_device_by_name(UCLASS_NOP, "socfpga-dtreg0",
> &dev);
> + ret = uclass_get_device_by_name(UCLASS_NOP, "socfpga-dtreg1",
> &dev);
> +
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index
> fccd9b89b8..c423905ba2 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -683,4 +683,11 @@ config SL28CPLD
> the base driver which provides common access methods for the
> sub-drivers.
>
> +config SPL_SOCFPGA_DT_REG
> + bool "Enable register setting from device tree in SPL"
> + depends on SPL
> + help
> + Enable register setting from device tree. This also
> + provides user a clean interface and all register settings are
> + centralized in one place, device tree.
> endmenu
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index
> b67b82358a..b74c8b9f80 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -89,3 +89,4 @@ obj-$(CONFIG_K3_AVS0) += k3_avs.o
> obj-$(CONFIG_ESM_K3) += k3_esm.o
> obj-$(CONFIG_ESM_PMIC) += esm_pmic.o
> obj-$(CONFIG_SL28CPLD) += sl28cpld.o
> +obj-$(CONFIG_SPL_SOCFPGA_SEC_REG) += socfpga_dtreg.o
> diff --git a/drivers/misc/socfpga_dtreg.c b/drivers/misc/socfpga_dtreg.c new
> file mode 100644 index 0000000000..a8554bfd1d
> --- /dev/null
> +++ b/drivers/misc/socfpga_dtreg.c
> @@ -0,0 +1,117 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2024 Intel Corporation <www.intel.com> */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <errno.h>
> +#include <asm/io.h>
> +#include <linux/sizes.h>
> +
> +#define NUMBER_OF_ELEMENTS 3
> +
> +static int socfpga_dtreg_probe(struct udevice *dev) {
> + const fdt32_t *list;
> + fdt_addr_t offset, base;
> + fdt_val_t val, read_val, mask, set_mask;
> + int size, i;
> + u32 blk_sz, reg;
> + ofnode node;
> + const char *name = NULL;
> +
> + debug("%s(dev=%p)\n", __func__, dev);
> +
> + if (!dev_has_ofnode(dev))
> + return 0;
> +
> + dev_for_each_subnode(node, dev) {
> + name = ofnode_get_name(node);
> + if (!name)
> + return -EINVAL;
> +
> + if (ofnode_read_u32_index(node, "reg", 1, &blk_sz))
> + return -EINVAL;
> +
> + base = ofnode_get_addr(node);
> + if (base == FDT_ADDR_T_NONE)
> + return -EINVAL;
> +
> + debug("%s(node_offset 0x%lx node_name %s ", __func__,
> + node.of_offset, name);
> + debug("node addr 0x%llx blk sz 0x%x)\n", base, blk_sz);
> +
> + list = ofnode_read_prop(node, "intel,offset-settings", &size);
> + if (!list)
> + return -EINVAL;
> +
> + debug("%s(intel,offset-settings property size=%x)\n",
> __func__,
> + size);
> + size /= sizeof(*list) * NUMBER_OF_ELEMENTS;
> +
> + /*
> + * First element: offset
> + * Second element: val
> + * Third element: mask
> + */
> + for (i = 0; i < size; i++) {
> + offset = fdt32_to_cpu(*list++);
> + val = fdt32_to_cpu(*list++);
> +
> + /* Reads the masking bit value from the list */
> + mask = fdt32_to_cpu(*list++);
> +
> + /*
> + * Reads out the offsets, value and masking bits
> + * Ex: <0x00000000 0x00000230 0xffffffff>
> + */
> + debug("%s(intel,offset-settings 0x%llx : 0x%llx :
> 0x%llx)\n",
> + __func__, offset, val, mask);
> +
> + if (blk_sz < offset + SZ_4) {
> + printf("%s: Overflow as offset 0x%llx or reg",
> + __func__, offset);
> + printf(" write is more than block size 0x%x\n",
> + blk_sz);
> + return -EINVAL;
> + }
> +
> + if (mask != 0) {
> + if (mask == 0xffffffff) {
> + reg = base + offset;
> + writel(val, (uintptr_t)reg);
> + } else {
> + /* Mask the value with the masking
> bits */
> + set_mask = val & mask;
> +
> + reg = base + offset;
> +
> + /* Clears and sets specific bits in the
> register */
> + clrsetbits_le32((uintptr_t)reg, mask,
> set_mask);
> + }
> + }
> +
> + read_val = readl((uintptr_t)reg);
> +
> + /* Reads out the register, masked value and the read
> value */
> + debug("%s(reg 0x%x = wr : 0x%llx rd : 0x%llx)\n",
> + __func__, reg, set_mask, read_val);
> +
> + }
> + }
> +
> + return 0;
> +};
> +
> +static const struct udevice_id socfpga_dtreg_ids[] = {
> + {.compatible = "intel,socfpga-dtreg"},
> + { }
> +};
> +
> +U_BOOT_DRIVER(socfpga_dtreg) = {
> + .name = "socfpga-dtreg",
> + .id = UCLASS_NOP,
> + .of_match = socfpga_dtreg_ids,
> + .probe = socfpga_dtreg_probe,
> +};
Reviewed-by: Tien Fong Chee <tien.fong.chee at intel.com>
Regards
Tien Fong
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