1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * Copyright (C) 2012 Altera Corporation <www.altera.com> 4 * All rights reserved. 5 * 6 * This file contains only support functions used also by the SoCFPGA 7 * platform code, the real meat is located in drivers/fpga/socfpga.c . 8 */ 9 10 #include <common.h> 11 #include <asm/io.h> 12 #include <linux/errno.h> 13 #include <asm/arch/fpga_manager.h> 14 #include <asm/arch/reset_manager.h> 15 #include <asm/arch/system_manager.h> 16 17 /* Timeout count */ 18 #define FPGA_TIMEOUT_CNT 0x1000000 19 20 static struct socfpga_fpga_manager *fpgamgr_regs = 21 (struct socfpga_fpga_manager *)SOCFPGA_FPGAMGRREGS_ADDRESS; 22 23 /* Check whether FPGA Init_Done signal is high */ 24 static int is_fpgamgr_initdone_high(void) 25 { 26 unsigned long val; 27 28 val = readl(&fpgamgr_regs->gpio_ext_porta); 29 return val & FPGAMGRREGS_MON_GPIO_EXT_PORTA_ID_MASK; 30 } 31 32 /* Get the FPGA mode */ 33 int fpgamgr_get_mode(void) 34 { 35 unsigned long val; 36 37 val = readl(&fpgamgr_regs->stat); 38 return val & FPGAMGRREGS_STAT_MODE_MASK; 39 } 40 41 /* Check whether FPGA is ready to be accessed */ 42 int fpgamgr_test_fpga_ready(void) 43 { 44 /* Check for init done signal */ 45 if (!is_fpgamgr_initdone_high()) 46 return 0; 47 48 /* Check again to avoid false glitches */ 49 if (!is_fpgamgr_initdone_high()) 50 return 0; 51 52 if (fpgamgr_get_mode() != FPGAMGRREGS_MODE_USERMODE) 53 return 0; 54 55 return 1; 56 } 57 58 /* Poll until FPGA is ready to be accessed or timeout occurred */ 59 int fpgamgr_poll_fpga_ready(void) 60 { 61 unsigned long i; 62 63 /* If FPGA is blank, wait till WD invoke warm reset */ 64 for (i = 0; i < FPGA_TIMEOUT_CNT; i++) { 65 /* check for init done signal */ 66 if (!is_fpgamgr_initdone_high()) 67 continue; 68 /* check again to avoid false glitches */ 69 if (!is_fpgamgr_initdone_high()) 70 continue; 71 return 1; 72 } 73 74 return 0; 75 } 76
