[U-Boot] [RFC v2 2/2] arm64: zynqmp: spl: install a PMU firmware config object at runtime
Michal Simek
michal.simek at xilinx.com
Wed Mar 27 15:03:32 UTC 2019
On 21. 03. 19 16:48, Luca Ceresoli wrote:
> Optionally allow U-Boot to load at the PMU firmware configuration object
> into the Power Management Unit (PMU) on Xilinx ZynqMP.
>
> The configuration object is required by the PMU FW to enable most SoC
> peripherals. So far the only way to boot using U-Boot SPL was to hard-code
> the configuration object in the PMU firmware. Allow a different boot
> process, where the PMU FW is equal for any ZynqMP chip and its
> configuration is passed at runtime by U-Boot SPL.
>
> All the code for Inter-processor communication with the PMU is isolated in
> a new file (pmu_ipc.c). The code is inspired by the same feature as
> implemented in the Xilinx First Stage Bootloader (FSBL) and Arm Trusted
> Firmware:
>
> * https://github.com/Xilinx/embeddedsw/blob/fb647e6b4c00f5154eba52a88b948195b6f1dc2b/lib/sw_apps/zynqmp_fsbl/src/xfsbl_misc_drivers.c#L295
> * https://github.com/ARM-software/arm-trusted-firmware/blob/c48d02bade88b07fa7f43aa44e5217f68e5d047f/plat/xilinx/zynqmp/pm_service/pm_api_sys.c#L357
>
> The load is logged on the console during boot:
>
> U-Boot SPL 2018.01 (Mar 20 2019 - 08:12:21)
> Loading PMUFW cfg obj (2008 bytes)
> EL Level: EL3
> ...
>
> Signed-off-by: Luca Ceresoli <luca at lucaceresoli.net>
>
> ---
>
> Changes RFC v1 -> RFC v2:
> - Load the cfg_obj in SPL, not U-Boot proper: this required a complete
> reimplementation since we cannot rely on ATF now
> - Update and refine the Kconfig option help
>
> Todo:
> - don't compile pm_cfg_obj.c from source, load it from a binary file
> ---
> board/xilinx/zynqmp/Kconfig | 26 ++++++++
> board/xilinx/zynqmp/Makefile | 5 ++
> board/xilinx/zynqmp/pmu_ipc.c | 116 ++++++++++++++++++++++++++++++++++
> board/xilinx/zynqmp/pmu_ipc.h | 14 ++++
> board/xilinx/zynqmp/zynqmp.c | 11 ++++
> 5 files changed, 172 insertions(+)
> create mode 100644 board/xilinx/zynqmp/pmu_ipc.c
> create mode 100644 board/xilinx/zynqmp/pmu_ipc.h
>
> diff --git a/board/xilinx/zynqmp/Kconfig b/board/xilinx/zynqmp/Kconfig
> index 7d1f7398c3e9..4201e38571e7 100644
> --- a/board/xilinx/zynqmp/Kconfig
> +++ b/board/xilinx/zynqmp/Kconfig
> @@ -15,4 +15,30 @@ config CMD_ZYNQMP
> and authentication feature enabled while generating
> BOOT.BIN using Xilinx bootgen tool.
>
> +config ZYNQMP_LOAD_PM_CFG_OBJ_FILE
> + string "PMU firmware configuration object to load at runtime"
> + help
> + Path to a PMU firmware configuration object to be built into
> + U-Boot and loaded at runtime by SPL into the PMU firmware.
> +
> + The ZynqMP Power Management Unit (PMU) needs a configuration
> + object for most SoC peripherals to work. It can be either
> + hard-coded in the PMUFW or passed at runtime.
> +
> + If the configuration object is not hard-coded in the PMU
> + firmware, U-Boot SPL can load it at runtime. To enable this
> + feature set here the file name (absolute path or relative to
> + board/xilinx/zynqmp/). It will be loaded into the PMU firmware by
> + U-Boot SPL during board initialization.
> +
> + Note: if your pm_cfg_obj.c is generated by the Xilinx tools,
> + you must remove any linking directives from the
> + XPm_ConfigObject declaration! E.g.:
> +
> + -const u32 XPm_ConfigObject[] __attribute__((used, section(".sys_cfg_data"))) = {
> + +const u32 XPm_ConfigObject[] = {
> +
> + Leave this option empty if your PMU firmware has a hard-coded
> + configuration object or you are loading it by any other means.
> +
> endif
> diff --git a/board/xilinx/zynqmp/Makefile b/board/xilinx/zynqmp/Makefile
> index 80f8ca7e1e4b..0d8f52ecd631 100644
> --- a/board/xilinx/zynqmp/Makefile
> +++ b/board/xilinx/zynqmp/Makefile
> @@ -33,6 +33,11 @@ ifneq ($(call ifdef_any_of, CONFIG_ZYNQMP_PSU_INIT_ENABLED CONFIG_SPL_BUILD),)
> obj-y += $(init-objs)
> endif
>
> +ifneq ($(CONFIG_ZYNQMP_LOAD_PM_CFG_OBJ_FILE),"")
> +CFLAGS_zynqmp.o += -DZYNQMP_LOAD_PM_CFG_OBJ -I$(srctree)/$(src)
> +obj-$(CONFIG_SPL_BUILD) += pmu_ipc.o
> +endif
> +
> obj-$(CONFIG_MMC_SDHCI_ZYNQ) += tap_delays.o
>
> ifndef CONFIG_SPL_BUILD
> diff --git a/board/xilinx/zynqmp/pmu_ipc.c b/board/xilinx/zynqmp/pmu_ipc.c
> new file mode 100644
> index 000000000000..6306d33d6f17
> --- /dev/null
> +++ b/board/xilinx/zynqmp/pmu_ipc.c
> @@ -0,0 +1,116 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Inter-Processor Communication with the Platform Management Unit (PMU)
> + * firmware.
> + *
> + * (C) Copyright 2019 Luca Ceresoli
> + * Luca Ceresoli <luca at lucaceresoli.net>
> + */
> +
> +#include "pmu_ipc.h"
> +#include <common.h>
> +#include <asm/io.h>
> +
> +/* IPI bitmasks, register base and register offsets */
> +#define IPI_BIT_MASK_APU 0x00001
> +#define IPI_BIT_MASK_PMU0 0x10000
> +#define IPI_REG_BASE_APU 0xFF300000
> +#define IPI_REG_BASE_PMU0 0xFF330000
> +#define IPI_REG_OFFSET_TRIG 0x00
> +#define IPI_REG_OFFSET_OBR 0x04
> +
> +/* IPI mailbox buffer offsets */
> +#define IPI_BUF_BASE_APU 0xFF990400
> +#define IPI_BUF_OFFSET_TARGET_PMU 0x1C0
> +#define IPI_BUF_OFFSET_REQ 0x00
> +#define IPI_BUF_OFFSET_RESP 0x20
> +
> +/* Xilinx FSBL sets 8, ATF sets 6. Which one is correct? */
> +#define PMUFW_PAYLOAD_ARG_CNT 6
> +
> +/* PMUFW commands */
> +#define PMUFW_CMD_SET_CONFIGURATION 2
> +
> +static void pmu_ipc_send_request(const u32 *req, size_t req_len)
> +{
> + u32 *mbx = IPI_BUF_BASE_APU +
> + IPI_BUF_OFFSET_TARGET_PMU +
> + IPI_BUF_OFFSET_REQ;
> + size_t i;
> +
> + for (i = 0; i < req_len; i++)
> + writel(req[i], &mbx[i]);
> +}
> +
> +static void pmu_ipc_read_response(unsigned int *value, size_t count)
> +{
> + u32 *mbx = IPI_BUF_BASE_APU +
> + IPI_BUF_OFFSET_TARGET_PMU +
> + IPI_BUF_OFFSET_RESP;
> + size_t i;
> +
> + for (i = 0; i < count; i++)
> + value[i] = readl(&mbx[i]);
> +}
> +
> +/**
> + * Send request to PMU and get the response.
> + *
> + * @req Request buffer. Byte 0 is the API ID, other bytes are optional
> + * parameters.
> + * @req_len Request length in number of 32-bit words.
> + * @res Response buffer. Byte 0 is the error code, other bytes are
> + * optional parameters. Optional, if @res_maxlen==0 the parameters
> + * will not be read.
> + * @res_maxlen Space allocated for the response in number of 32-bit words.
> + *
> + * @return Error code returned by the PMU (i.e. the first word of the response)
> + */
> +static int pmu_ipc_request(const u32 *req, size_t req_len,
> + u32 *res, size_t res_maxlen)
> +{
> + u32 status;
> +
> + if (req_len > PMUFW_PAYLOAD_ARG_CNT ||
> + res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
> + return -EINVAL;
> +
> + pmu_ipc_send_request(req, req_len);
> +
> + /* Raise Inter-Processor Interrupt to PMU and wait for response */
> + writel(IPI_BIT_MASK_PMU0, IPI_REG_BASE_APU + IPI_REG_OFFSET_TRIG);
> + do {
> + status = readl(IPI_REG_BASE_APU + IPI_REG_OFFSET_OBR);
> + } while (status & IPI_BIT_MASK_PMU0);
> +
> + pmu_ipc_read_response(res, res_maxlen);
> +
> + return 0;
> +}
All above should be mailbox driver. It means this should go to
drivers/mailbox and be split to mbox send/recv functions.
But I have no problem to use this configuration in the first patch and
move to mbox driver in separate patch.
> +
> +/**
> + * Send a configuration object to the PMU firmware.
> + *
> + * @cfg_obj Pointer to the configuration object
> + * @size Size of @cfg_obj in bytes
> + */
> +void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
> +{
> + const u32 *ocm = (u32 *)CONFIG_SPL_TEXT_BASE;
> + const u32 request[] = {
> + PMUFW_CMD_SET_CONFIGURATION,
> + CONFIG_SPL_TEXT_BASE
> + };
> + u32 response;
> + int err;
> +
> + printf("Loading PMUFW cfg obj (%ld bytes)\n", size);
> +
> + memcpy(ocm, cfg_obj, size);
> +
> + err = pmu_ipc_request(request, ARRAY_SIZE(request), &response, 1);
> + if (err)
> + panic("Cannot load PMUFW configuration object (%d)\n", err);
> + if (response != 0)
> + panic("PMUFW returned 0x%08x status!\n", response);
> +}
And this can stay here or go to arch/arm/mach-zynq/
> diff --git a/board/xilinx/zynqmp/pmu_ipc.h b/board/xilinx/zynqmp/pmu_ipc.h
> new file mode 100644
> index 000000000000..37bb72c1b20a
> --- /dev/null
> +++ b/board/xilinx/zynqmp/pmu_ipc.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * (C) Copyright 2019 Luca Ceresoli
> + * Luca Ceresoli <luca at lucaceresoli.net>
> + */
> +
> +#ifndef __ZYNQMP_PMU_IPC_H__
> +#define __ZYNQMP_PMU_IPC_H__
> +
> +#include <linux/types.h>
> +
> +void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size);
> +
arch/arm/mach-zynqmp/include/mach/sys_proto.h should be fine.
> +#endif /* __ZYNQMP_PMU_IPC_H__ */
> diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
> index 5e1d2116bc32..1d5e25961863 100644
> --- a/board/xilinx/zynqmp/zynqmp.c
> +++ b/board/xilinx/zynqmp/zynqmp.c
> @@ -4,6 +4,8 @@
> * Michal Simek <michal.simek at xilinx.com>
> */
>
> +#include "pmu_ipc.h"
> +
> #include <common.h>
> #include <sata.h>
> #include <ahci.h>
> @@ -302,6 +304,10 @@ static char *zynqmp_get_silicon_idcode_name(void)
> }
> #endif
>
> +#ifdef ZYNQMP_LOAD_PM_CFG_OBJ
> +#include CONFIG_ZYNQMP_LOAD_PM_CFG_OBJ_FILE
> +#endif
> +
> int board_early_init_f(void)
> {
> int ret = 0;
> @@ -332,6 +338,11 @@ int board_early_init_f(void)
>
> int board_init(void)
> {
> +#if defined(CONFIG_SPL_BUILD) && defined(ZYNQMP_LOAD_PM_CFG_OBJ)
> + zynqmp_pmufw_load_config_object(XPm_ConfigObject,
> + sizeof(XPm_ConfigObject));
> +#endif
As we discussed over IRC. I think that this should be simply bin
firmware file compare to C built by u-boot.
Thanks,
Michal
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