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 #include <asm/cache.h>
  12
  13 #if defined(CONFIG_ZYNQMP_IPI)
  14 #include <mailbox.h>
  15 #include <asm/arch/sys_proto.h>
  16
  17 #define PMUFW_PAYLOAD_ARG_CNT   8
  18
  19 struct zynqmp_power {
  20         struct mbox_chan tx_chan;
  21         struct mbox_chan rx_chan;
  22 } zynqmp_power;
  23
  24 static int ipi_req(const u32 *req, size_t req_len, u32 *res, size_t res_maxlen)
  25 {
  26         struct zynqmp_ipi_msg msg;
  27         int ret;
  28
  29         if (req_len > PMUFW_PAYLOAD_ARG_CNT ||
  30             res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
  31                 return -EINVAL;
  32
  33         if (!(zynqmp_power.tx_chan.dev) || !(&zynqmp_power.rx_chan.dev))
  34                 return -EINVAL;
  35
  36         msg.buf = (u32 *)req;
  37         msg.len = req_len;
  38         ret = mbox_send(&zynqmp_power.tx_chan, &msg);
  39         if (ret) {
  40                 debug("%s: Sending message failed\n", __func__);
  41                 return ret;
  42         }
  43
  44         msg.buf = res;
  45         msg.len = res_maxlen;
  46         ret = mbox_recv(&zynqmp_power.rx_chan, &msg, 100);
  47         if (ret)
  48                 debug("%s: Receiving message failed\n", __func__);
  49
  50         return ret;
  51 }
  52
  53 static int send_req(const u32 *req, size_t req_len, u32 *res, size_t res_maxlen)
  54 {
  55         if (IS_ENABLED(CONFIG_SPL_BUILD) || current_el() == 3)
  56                 return ipi_req(req, req_len, res, res_maxlen);
  57
  58         return xilinx_pm_request(req[0], 0, 0, 0, 0, res);
  59 }
  60
  61 unsigned int zynqmp_firmware_version(void)
  62 {
  63         int ret;
  64         u32 ret_payload[PAYLOAD_ARG_CNT];
  65         static u32 pm_api_version = ZYNQMP_PM_VERSION_INVALID;
  66
  67         /*
  68          * Get PMU version only once and later
  69          * just return stored values instead of
  70          * asking PMUFW again.
  71          **/
  72         if (pm_api_version == ZYNQMP_PM_VERSION_INVALID) {
  73                 const u32 request[] = { PM_GET_API_VERSION };
  74
  75                 ret = send_req(request, ARRAY_SIZE(request), ret_payload, 2);
  76                 if (ret)
  77                         panic("PMUFW is not found - Please load it!\n");
  78
  79                 pm_api_version = ret_payload[1];
  80                 if (pm_api_version < ZYNQMP_PM_VERSION)
  81                         panic("PMUFW version error. Expected: v%d.%d\n",
  82                               ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR);
  83         }
  84
  85         return pm_api_version;
  86 };
  87
  88 /**
  89  * Send a configuration object to the PMU firmware.
  90  *
  91  * @cfg_obj: Pointer to the configuration object
  92  * @size:    Size of @cfg_obj in bytes
  93  */
  94 void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
  95 {
  96         const u32 request[] = {
  97                 PM_SET_CONFIGURATION,
  98                 (u32)((u64)cfg_obj)
  99         };
 100         u32 response;
 101         int err;
 102
 103         printf("Loading new PMUFW cfg obj (%ld bytes)\n", size);
 104
 105         err = send_req(request, ARRAY_SIZE(request), &response, 1);
 106         if (err)
 107                 panic("Cannot load PMUFW configuration object (%d)\n", err);
 108         if (response != 0)
 109                 panic("PMUFW returned 0x%08x status!\n", response);
 110 }
 111
 112 static int zynqmp_power_probe(struct udevice *dev)
 113 {
 114         int ret;
 115
 116         debug("%s, (dev=%p)\n", __func__, dev);
 117
 118         ret = mbox_get_by_name(dev, "tx", &zynqmp_power.tx_chan);
 119         if (ret) {
 120                 debug("%s: Cannot find tx mailbox\n", __func__);
 121                 return ret;
 122         }
 123
 124         ret = mbox_get_by_name(dev, "rx", &zynqmp_power.rx_chan);
 125         if (ret) {
 126                 debug("%s: Cannot find rx mailbox\n", __func__);
 127                 return ret;
 128         }
 129
 130         ret = zynqmp_firmware_version();
 131         printf("PMUFW:\tv%d.%d\n",
 132                ret >> ZYNQMP_PM_VERSION_MAJOR_SHIFT,
 133                ret & ZYNQMP_PM_VERSION_MINOR_MASK);
 134
 135         return 0;
 136 };
 137
 138 static const struct udevice_id zynqmp_power_ids[] = {
 139         { .compatible = "xlnx,zynqmp-power" },
 140         { }
 141 };
 142
 143 U_BOOT_DRIVER(zynqmp_power) = {
 144         .name = "zynqmp_power",
 145         .id = UCLASS_FIRMWARE,
 146         .of_match = zynqmp_power_ids,
 147         .probe = zynqmp_power_probe,
 148 };
 149 #endif
 150
 151 int __maybe_unused xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
 152                                      u32 arg3, u32 *ret_payload)
 153 {
 154         /*
 155          * Added SIP service call Function Identifier
 156          * Make sure to stay in x0 register
 157          */
 158         struct pt_regs regs;
 159
 160         if (current_el() == 3) {
 161                 printf("%s: Can't call SMC from EL3 context\n", __func__);
 162                 return -EPERM;
 163         }
 164
 165         regs.regs[0] = PM_SIP_SVC | api_id;
 166         regs.regs[1] = ((u64)arg1 << 32) | arg0;
 167         regs.regs[2] = ((u64)arg3 << 32) | arg2;
 168
 169         smc_call(&regs);
 170
 171         if (ret_payload) {
 172                 ret_payload[0] = (u32)regs.regs[0];
 173                 ret_payload[1] = upper_32_bits(regs.regs[0]);
 174                 ret_payload[2] = (u32)regs.regs[1];
 175                 ret_payload[3] = upper_32_bits(regs.regs[1]);
 176                 ret_payload[4] = (u32)regs.regs[2];
 177         }
 178
 179         return regs.regs[0];
 180 }
 181
 182 static const struct udevice_id zynqmp_firmware_ids[] = {
 183         { .compatible = "xlnx,zynqmp-firmware" },
 184         { .compatible = "xlnx,versal-firmware"},
 185         { }
 186 };
 187
 188 U_BOOT_DRIVER(zynqmp_firmware) = {
 189         .id = UCLASS_FIRMWARE,
 190         .name = "zynqmp-firmware",
 191         .of_match = zynqmp_firmware_ids,
 192 };