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https://github.com/AsahiLinux/u-boot
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c28a9cfa40
Optionally allow U-Boot to load a configuration object into the Power Management Unit (PMU) firmware 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: *fb647e6b4c/lib/sw_apps/zynqmp_fsbl/src/xfsbl_misc_drivers.c (L295)*c48d02bade/plat/xilinx/zynqmp/pm_service/pm_api_sys.c (L357)SPL logs on the console before loading the configuration object: U-Boot SPL 2019.07-rc1-00511-gaec224515c87 (May 15 2019 - 08:43:41 +0200) Loading PMUFW cfg obj (2008 bytes) EL Level: EL3 ... Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
112 lines
3 KiB
C
112 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Inter-Processor Communication with the Platform Management Unit (PMU)
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* firmware.
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*
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* (C) Copyright 2019 Luca Ceresoli
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* Luca Ceresoli <luca@lucaceresoli.net>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/sys_proto.h>
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/* IPI bitmasks, register base and register offsets */
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#define IPI_BIT_MASK_APU 0x00001
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#define IPI_BIT_MASK_PMU0 0x10000
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#define IPI_REG_BASE_APU 0xFF300000
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#define IPI_REG_BASE_PMU0 0xFF330000
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#define IPI_REG_OFFSET_TRIG 0x00
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#define IPI_REG_OFFSET_OBR 0x04
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/* IPI mailbox buffer offsets */
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#define IPI_BUF_BASE_APU 0xFF990400
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#define IPI_BUF_OFFSET_TARGET_PMU 0x1C0
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#define IPI_BUF_OFFSET_REQ 0x00
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#define IPI_BUF_OFFSET_RESP 0x20
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#define PMUFW_PAYLOAD_ARG_CNT 8
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/* PMUFW commands */
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#define PMUFW_CMD_SET_CONFIGURATION 2
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static void pmu_ipc_send_request(const u32 *req, size_t req_len)
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{
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u32 *mbx = (u32 *)(IPI_BUF_BASE_APU +
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IPI_BUF_OFFSET_TARGET_PMU +
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IPI_BUF_OFFSET_REQ);
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size_t i;
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for (i = 0; i < req_len; i++)
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writel(req[i], &mbx[i]);
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}
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static void pmu_ipc_read_response(unsigned int *value, size_t count)
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{
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u32 *mbx = (u32 *)(IPI_BUF_BASE_APU +
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IPI_BUF_OFFSET_TARGET_PMU +
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IPI_BUF_OFFSET_RESP);
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size_t i;
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for (i = 0; i < count; i++)
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value[i] = readl(&mbx[i]);
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}
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/**
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* Send request to PMU and get the response.
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*
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* @req: Request buffer. Byte 0 is the API ID, other bytes are optional
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* parameters.
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* @req_len: Request length in number of 32-bit words.
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* @res: Response buffer. Byte 0 is the error code, other bytes are
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* optional parameters. Optional, if @res_maxlen==0 the parameters
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* will not be read.
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* @res_maxlen: Space allocated for the response in number of 32-bit words.
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*
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* @return Error code returned by the PMU (i.e. the first word of the response)
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*/
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static int pmu_ipc_request(const u32 *req, size_t req_len,
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u32 *res, size_t res_maxlen)
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{
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u32 status;
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if (req_len > PMUFW_PAYLOAD_ARG_CNT ||
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res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
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return -EINVAL;
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pmu_ipc_send_request(req, req_len);
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/* Raise Inter-Processor Interrupt to PMU and wait for response */
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writel(IPI_BIT_MASK_PMU0, IPI_REG_BASE_APU + IPI_REG_OFFSET_TRIG);
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do {
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status = readl(IPI_REG_BASE_APU + IPI_REG_OFFSET_OBR);
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} while (status & IPI_BIT_MASK_PMU0);
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pmu_ipc_read_response(res, res_maxlen);
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return 0;
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}
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/**
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* Send a configuration object to the PMU firmware.
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*
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* @cfg_obj: Pointer to the configuration object
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* @size: Size of @cfg_obj in bytes
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*/
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void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
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{
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const u32 request[] = {
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PMUFW_CMD_SET_CONFIGURATION,
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(u32)((u64)cfg_obj)
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};
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u32 response;
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int err;
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printf("Loading PMUFW cfg obj (%ld bytes)\n", size);
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err = pmu_ipc_request(request, ARRAY_SIZE(request), &response, 1);
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if (err)
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panic("Cannot load PMUFW configuration object (%d)\n", err);
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if (response != 0)
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panic("PMUFW returned 0x%08x status!\n", response);
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}
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