| Albin Tonnerre | 626e02a | 2009-08-07 12:37:36 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 |
| 3 | * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com> |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <common.h> |
| 25 | #include <spi.h> |
| 26 | |
| 27 | #define SPI_EEPROM_WREN 0x06 |
| 28 | #define SPI_EEPROM_RDSR 0x05 |
| 29 | #define SPI_EEPROM_READ 0x03 |
| 30 | #define SPI_EEPROM_WRITE 0x02 |
| 31 | |
| 32 | #ifndef CONFIG_DEFAULT_SPI_BUS |
| 33 | #define CONFIG_DEFAULT_SPI_BUS 0 |
| 34 | #endif |
| 35 | |
| 36 | #ifndef CONFIG_DEFAULT_SPI_MODE |
| 37 | #define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 |
| 38 | #endif |
| 39 | |
| 40 | ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len) |
| 41 | { |
| 42 | struct spi_slave *slave; |
| 43 | u8 cmd = SPI_EEPROM_READ; |
| 44 | |
| 45 | slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000, |
| 46 | CONFIG_DEFAULT_SPI_MODE); |
| 47 | spi_claim_bus(slave); |
| 48 | |
| 49 | /* command */ |
| 50 | if(spi_xfer(slave, 8, &cmd, NULL, SPI_XFER_BEGIN)) |
| 51 | return -1; |
| 52 | |
| 53 | /* |
| 54 | * if alen == 3, addr[0] is the block number, we never use it here. All we |
| 55 | * need are the lower 16 bits |
| 56 | */ |
| 57 | if (alen == 3) |
| 58 | addr++; |
| 59 | |
| 60 | /* address, and data */ |
| 61 | if(spi_xfer(slave, 16, addr, NULL, 0)) |
| 62 | return -1; |
| 63 | if(spi_xfer(slave, 8 * len, NULL, buffer, SPI_XFER_END)) |
| 64 | return -1; |
| 65 | |
| 66 | spi_release_bus(slave); |
| 67 | spi_free_slave(slave); |
| 68 | return len; |
| 69 | } |
| 70 | |
| 71 | ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len) |
| 72 | { |
| 73 | struct spi_slave *slave; |
| Albin Tonnerre | 626e02a | 2009-08-07 12:37:36 +0200 | [diff] [blame] | 74 | char buf[3]; |
| 75 | |
| 76 | slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000, |
| 77 | CONFIG_DEFAULT_SPI_MODE); |
| 78 | spi_claim_bus(slave); |
| 79 | |
| 80 | buf[0] = SPI_EEPROM_WREN; |
| 81 | if(spi_xfer(slave, 8, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END)) |
| 82 | return -1; |
| 83 | |
| 84 | buf[0] = SPI_EEPROM_WRITE; |
| 85 | |
| 86 | /* As for reading, drop addr[0] if alen is 3 */ |
| 87 | if (alen == 3) { |
| 88 | alen--; |
| 89 | addr++; |
| 90 | } |
| 91 | |
| 92 | memcpy(buf + 1, addr, alen); |
| 93 | /* command + addr, then data */ |
| 94 | if(spi_xfer(slave, 24, buf, NULL, SPI_XFER_BEGIN)) |
| 95 | return -1; |
| 96 | if(spi_xfer(slave, len * 8, buffer, NULL, SPI_XFER_END)) |
| 97 | return -1; |
| 98 | |
| 99 | reset_timer_masked(); |
| 100 | do { |
| 101 | buf[0] = SPI_EEPROM_RDSR; |
| 102 | buf[1] = 0; |
| 103 | spi_xfer(slave, 16, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END); |
| 104 | |
| 105 | if (!(buf[1] & 1)) |
| 106 | break; |
| 107 | |
| 108 | } while (get_timer_masked() < CONFIG_SYS_SPI_WRITE_TOUT); |
| 109 | |
| 110 | if (buf[1] & 1) |
| 111 | printf ("*** spi_write: Time out while writing!\n"); |
| 112 | |
| 113 | spi_release_bus(slave); |
| 114 | spi_free_slave(slave); |
| 115 | return len; |
| 116 | } |