drivers/firmware/firmware-zynqmp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Xilinx Zynq MPSoC Firmware driver
   4  *
   5  * Copyright (C) 2018-2019 Xilinx, Inc.
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <zynqmp_firmware.h>
  11
  12 #if defined(CONFIG_ZYNQMP_IPI)
  13 #include <mailbox.h>
  14 #include <asm/arch/sys_proto.h>
  15
  16 #define PMUFW_PAYLOAD_ARG_CNT   8
  17
  18 struct zynqmp_power {
  19         struct mbox_chan tx_chan;
  20         struct mbox_chan rx_chan;
  21 } zynqmp_power;
  22
  23 static int ipi_req(const u32 *req, size_t req_len, u32 *res, size_t res_maxlen)
  24 {
  25         struct zynqmp_ipi_msg msg;
  26         int ret;
  27
  28         if (req_len > PMUFW_PAYLOAD_ARG_CNT ||
  29             res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
  30                 return -EINVAL;
  31
  32         if (!(zynqmp_power.tx_chan.dev) || !(&zynqmp_power.rx_chan.dev))
  33                 return -EINVAL;
  34
  35         msg.buf = (u32 *)req;
  36         msg.len = req_len;
  37         ret = mbox_send(&zynqmp_power.tx_chan, &msg);
  38         if (ret) {
  39                 debug("%s: Sending message failed\n", __func__);
  40                 return ret;
  41         }
  42
  43         msg.buf = res;
  44         msg.len = res_maxlen;
  45         ret = mbox_recv(&zynqmp_power.rx_chan, &msg, 100);
  46         if (ret)
  47                 debug("%s: Receiving message failed\n", __func__);
  48
  49         return ret;
  50 }
  51
  52 static int send_req(const u32 *req, size_t req_len, u32 *res, size_t res_maxlen)
  53 {
  54         if (IS_ENABLED(CONFIG_SPL_BUILD) || current_el() == 3)
  55                 return ipi_req(req, req_len, res, res_maxlen);
  56
  57         return xilinx_pm_request(req[0], 0, 0, 0, 0, res);
  58 }
  59
  60 unsigned int zynqmp_firmware_version(void)
  61 {
  62         int ret;
  63         u32 ret_payload[PAYLOAD_ARG_CNT];
  64         static u32 pm_api_version = ZYNQMP_PM_VERSION_INVALID;
  65
  66         /*
  67          * Get PMU version only once and later
  68          * just return stored values instead of
  69          * asking PMUFW again.
  70          **/
  71         if (pm_api_version == ZYNQMP_PM_VERSION_INVALID) {
  72                 const u32 request[] = { PM_GET_API_VERSION };
  73
  74                 ret = send_req(request, ARRAY_SIZE(request), ret_payload, 2);
  75                 if (ret)
  76                         panic("PMUFW is not found - Please load it!\n");
  77
  78                 pm_api_version = ret_payload[1];
  79                 if (pm_api_version < ZYNQMP_PM_VERSION)
  80                         panic("PMUFW version error. Expected: v%d.%d\n",
  81                               ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR);
  82         }
  83
  84         return pm_api_version;
  85 };
  86
  87 /**
  88  * Send a configuration object to the PMU firmware.
  89  *
  90  * @cfg_obj: Pointer to the configuration object
  91  * @size:    Size of @cfg_obj in bytes
  92  */
  93 void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
  94 {
  95         const u32 request[] = {
  96                 PM_SET_CONFIGURATION,
  97                 (u32)((u64)cfg_obj)
  98         };
  99         u32 response;
 100         int err;
 101
 102         printf("Loading new PMUFW cfg obj (%ld bytes)\n", size);
 103
 104         err = send_req(request, ARRAY_SIZE(request), &response, 1);
 105         if (err)
 106                 panic("Cannot load PMUFW configuration object (%d)\n", err);
 107         if (response != 0)
 108                 panic("PMUFW returned 0x%08x status!\n", response);
 109 }
 110
 111 static int zynqmp_power_probe(struct udevice *dev)
 112 {
 113         int ret;
 114
 115         debug("%s, (dev=%p)\n", __func__, dev);
 116
 117         ret = mbox_get_by_name(dev, "tx", &zynqmp_power.tx_chan);
 118         if (ret) {
 119                 debug("%s: Cannot find tx mailbox\n", __func__);
 120                 return ret;
 121         }
 122
 123         ret = mbox_get_by_name(dev, "rx", &zynqmp_power.rx_chan);
 124         if (ret) {
 125                 debug("%s: Cannot find rx mailbox\n", __func__);
 126                 return ret;
 127         }
 128
 129         ret = zynqmp_firmware_version();
 130         printf("PMUFW:\tv%d.%d\n",
 131                ret >> ZYNQMP_PM_VERSION_MAJOR_SHIFT,
 132                ret & ZYNQMP_PM_VERSION_MINOR_MASK);
 133
 134         return 0;
 135 };
 136
 137 static const struct udevice_id zynqmp_power_ids[] = {
 138         { .compatible = "xlnx,zynqmp-power" },
 139         { }
 140 };
 141
 142 U_BOOT_DRIVER(zynqmp_power) = {
 143         .name = "zynqmp_power",
 144         .id = UCLASS_FIRMWARE,
 145         .of_match = zynqmp_power_ids,
 146         .probe = zynqmp_power_probe,
 147 };
 148 #endif
 149
 150 int __maybe_unused xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
 151                                      u32 arg3, u32 *ret_payload)
 152 {
 153         /*
 154          * Added SIP service call Function Identifier
 155          * Make sure to stay in x0 register
 156          */
 157         struct pt_regs regs;
 158
 159         if (current_el() == 3) {
 160                 printf("%s: Can't call SMC from EL3 context\n", __func__);
 161                 return -EPERM;
 162         }
 163
 164         regs.regs[0] = PM_SIP_SVC | api_id;
 165         regs.regs[1] = ((u64)arg1 << 32) | arg0;
 166         regs.regs[2] = ((u64)arg3 << 32) | arg2;
 167
 168         smc_call(&regs);
 169
 170         if (ret_payload) {
 171                 ret_payload[0] = (u32)regs.regs[0];
 172                 ret_payload[1] = upper_32_bits(regs.regs[0]);
 173                 ret_payload[2] = (u32)regs.regs[1];
 174                 ret_payload[3] = upper_32_bits(regs.regs[1]);
 175                 ret_payload[4] = (u32)regs.regs[2];
 176         }
 177
 178         return regs.regs[0];
 179 }
 180
 181 static const struct udevice_id zynqmp_firmware_ids[] = {
 182         { .compatible = "xlnx,zynqmp-firmware" },
 183         { .compatible = "xlnx,versal-firmware"},
 184         { }
 185 };
 186
 187 U_BOOT_DRIVER(zynqmp_firmware) = {
 188         .id = UCLASS_FIRMWARE,
 189         .name = "zynqmp-firmware",
 190         .of_match = zynqmp_firmware_ids,
 191 };