Paul Mundt | efd590d | 2010-01-20 15:08:36 +0900 | [diff] [blame] | 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> |
Paul Mundt | d9116d0 | 2010-01-20 18:25:19 +0900 | [diff] [blame] | 14 | #include <asm/sizes.h> |
Paul Mundt | efd590d | 2010-01-20 15:08:36 +0900 | [diff] [blame] | 15 | |
Paul Mundt | d9116d0 | 2010-01-20 18:25:19 +0900 | [diff] [blame] | 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 | } |
Paul Mundt | efd590d | 2010-01-20 15:08:36 +0900 | [diff] [blame] | 52 | |
| 53 | void __iomem *sdk7786_fpga_base; |
| 54 | |
| 55 | void __init sdk7786_fpga_init(void) |
| 56 | { |
| 57 | u16 version, date; |
| 58 | |
Paul Mundt | d9116d0 | 2010-01-20 18:25:19 +0900 | [diff] [blame] | 59 | sdk7786_fpga_base = sdk7786_fpga_probe(); |
Paul Mundt | efd590d | 2010-01-20 15:08:36 +0900 | [diff] [blame] | 60 | if (unlikely(!sdk7786_fpga_base)) { |
Paul Mundt | d9116d0 | 2010-01-20 18:25:19 +0900 | [diff] [blame] | 61 | panic("FPGA detection failed.\n"); |
Paul Mundt | efd590d | 2010-01-20 15:08:36 +0900 | [diff] [blame] | 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 | } |