1 /* 2 * SDK7786 FPGA Support. 3 * 4 * Copyright (C) 2010 Paul Mundt 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/bcd.h> 13 #include <mach/fpga.h> 14 #include <asm/sizes.h> 15 16 #define FPGA_REGS_OFFSET 0x03fff800 17 #define FPGA_REGS_SIZE 0x490 18 19 /* 20 * The FPGA can be mapped in any of the generally available areas, 21 * so we attempt to scan for it using the fixed SRSTR read magic. 22 * 23 * Once the FPGA is located, the rest of the mapping data for the other 24 * components can be determined dynamically from its section mapping 25 * registers. 26 */ 27 static void __iomem *sdk7786_fpga_probe(void) 28 { 29 unsigned long area; 30 void __iomem *base; 31 32 /* 33 * Iterate over all of the areas where the FPGA could be mapped. 34 * The possible range is anywhere from area 0 through 6, area 7 35 * is reserved. 36 */ 37 for (area = PA_AREA0; area < PA_AREA7; area += SZ_64M) { 38 base = ioremap_nocache(area + FPGA_REGS_OFFSET, FPGA_REGS_SIZE); 39 if (!base) { 40 /* Failed to remap this area, move along. */ 41 continue; 42 } 43 44 if (ioread16(base + SRSTR) == SRSTR_MAGIC) 45 return base; /* Found it! */ 46 47 iounmap(base); 48 } 49 50 return NULL; 51 } 52 53 void __iomem *sdk7786_fpga_base; 54 55 void __init sdk7786_fpga_init(void) 56 { 57 u16 version, date; 58 59 sdk7786_fpga_base = sdk7786_fpga_probe(); 60 if (unlikely(!sdk7786_fpga_base)) { 61 panic("FPGA detection failed.\n"); 62 return; 63 } 64 65 version = fpga_read_reg(FPGAVR); 66 date = fpga_read_reg(FPGADR); 67 68 pr_info("\tFPGA version:\t%d.%d (built on %d/%d/%d)\n", 69 bcd2bin(version >> 8) & 0xf, bcd2bin(version & 0xf), 70 ((date >> 12) & 0xf) + 2000, 71 (date >> 8) & 0xf, bcd2bin(date & 0xff)); 72 } 73