| Yoshihiro Shimoda | 1a2621b | 2012-11-04 15:53:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Renesas Solutions Corp. |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU Lesser |
| 5 | * General Public License. See the file "COPYING.LIB" in the main |
| 6 | * directory of this archive for more details. |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | |
| 11 | #define CONFIG_RAM_BOOT_PHYS CONFIG_SYS_TEXT_BASE |
| 12 | #define CONFIG_SPI_ADDR 0x00000000 |
| 13 | #define CONFIG_SPI_LENGTH CONFIG_SYS_MONITOR_LEN |
| 14 | #define CONFIG_RAM_BOOT CONFIG_SYS_TEXT_BASE |
| 15 | |
| 16 | #define SPIWDMADR 0xFE001018 |
| 17 | #define SPIWDMCNTR 0xFE001020 |
| 18 | #define SPIDMCOR 0xFE001028 |
| 19 | #define SPIDMINTSR 0xFE001188 |
| 20 | #define SPIDMINTMR 0xFE001190 |
| 21 | |
| 22 | #define SPIDMINTSR_DMEND 0x00000004 |
| 23 | |
| 24 | #define TBR 0xFE002000 |
| 25 | #define RBR 0xFE002000 |
| 26 | |
| 27 | #define CR1 0xFE002008 |
| 28 | #define CR2 0xFE002010 |
| 29 | #define CR3 0xFE002018 |
| 30 | #define CR4 0xFE002020 |
| 31 | |
| 32 | /* CR1 */ |
| 33 | #define SPI_TBE 0x80 |
| 34 | #define SPI_TBF 0x40 |
| 35 | #define SPI_RBE 0x20 |
| 36 | #define SPI_RBF 0x10 |
| 37 | #define SPI_PFONRD 0x08 |
| 38 | #define SPI_SSDB 0x04 |
| 39 | #define SPI_SSD 0x02 |
| 40 | #define SPI_SSA 0x01 |
| 41 | |
| 42 | /* CR2 */ |
| 43 | #define SPI_RSTF 0x80 |
| 44 | #define SPI_LOOPBK 0x40 |
| 45 | #define SPI_CPOL 0x20 |
| 46 | #define SPI_CPHA 0x10 |
| 47 | #define SPI_L1M0 0x08 |
| 48 | |
| 49 | /* CR4 */ |
| 50 | #define SPI_TBEI 0x80 |
| 51 | #define SPI_TBFI 0x40 |
| 52 | #define SPI_RBEI 0x20 |
| 53 | #define SPI_RBFI 0x10 |
| 54 | #define SPI_SpiS0 0x02 |
| 55 | #define SPI_SSS 0x01 |
| 56 | |
| 57 | #define spi_write(val, addr) (*(volatile unsigned long *)(addr)) = val |
| 58 | #define spi_read(addr) (*(volatile unsigned long *)(addr)) |
| 59 | |
| 60 | /* M25P80 */ |
| 61 | #define M25_READ 0x03 |
| 62 | |
| 63 | #define __uses_spiboot2 __attribute__((section(".spiboot2.text"))) |
| 64 | static void __uses_spiboot2 spi_reset(void) |
| 65 | { |
| 66 | int timeout = 0x00100000; |
| 67 | |
| 68 | /* Make sure the last transaction is finalized */ |
| 69 | spi_write(0x00, CR3); |
| 70 | spi_write(0x02, CR1); |
| 71 | while (!(spi_read(CR4) & SPI_SpiS0)) { |
| 72 | if (timeout-- < 0) |
| 73 | break; |
| 74 | } |
| 75 | spi_write(0x00, CR1); |
| 76 | |
| 77 | spi_write(spi_read(CR2) | SPI_RSTF, CR2); /* fifo reset */ |
| 78 | spi_write(spi_read(CR2) & ~SPI_RSTF, CR2); |
| 79 | |
| 80 | spi_write(0, SPIDMCOR); |
| 81 | } |
| 82 | |
| 83 | static void __uses_spiboot2 spi_read_flash(void *buf, unsigned long addr, |
| 84 | unsigned long len) |
| 85 | { |
| 86 | spi_write(M25_READ, TBR); |
| 87 | spi_write((addr >> 16) & 0xFF, TBR); |
| 88 | spi_write((addr >> 8) & 0xFF, TBR); |
| 89 | spi_write(addr & 0xFF, TBR); |
| 90 | |
| 91 | spi_write(SPIDMINTSR_DMEND, SPIDMINTSR); |
| 92 | spi_write((unsigned long)buf, SPIWDMADR); |
| 93 | spi_write(len & 0xFFFFFFE0, SPIWDMCNTR); |
| 94 | spi_write(1, SPIDMCOR); |
| 95 | |
| 96 | spi_write(0xff, CR3); |
| 97 | spi_write(spi_read(CR1) | SPI_SSDB, CR1); |
| 98 | spi_write(spi_read(CR1) | SPI_SSA, CR1); |
| 99 | |
| 100 | while (!(spi_read(SPIDMINTSR) & SPIDMINTSR_DMEND)) |
| 101 | ; |
| 102 | |
| 103 | /* Nagate SP0-SS0 */ |
| 104 | spi_write(0, CR1); |
| 105 | } |
| 106 | |
| 107 | void __uses_spiboot2 spiboot_main(void) |
| 108 | { |
| 109 | void (*_start)(void) = (void *)CONFIG_SYS_TEXT_BASE; |
| 110 | |
| 111 | spi_reset(); |
| 112 | spi_read_flash((void *)CONFIG_RAM_BOOT_PHYS, CONFIG_SPI_ADDR, |
| 113 | CONFIG_SPI_LENGTH); |
| 114 | |
| 115 | _start(); |
| 116 | } |