| Peter Pearse | 160131b | 2007-05-09 11:41:58 +0100 | [diff] [blame^] | 1 | /* |
| 2 | This file defines the interface to the lpc22xx SPI module. |
| 3 | Copyright (C) 2006 Embedded Artists AB (www.embeddedartists.com) |
| 4 | |
| 5 | This file may be included in software not adhering to the GPL. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #ifndef SPI_H |
| 23 | #define SPI_H |
| 24 | |
| 25 | #include <config.h> |
| 26 | #include <common.h> |
| 27 | #include <asm/errno.h> |
| 28 | #include <asm/arch/hardware.h> |
| 29 | |
| 30 | #define SPIF 0x80 |
| 31 | |
| 32 | #define spi_lock() disable_interrupts(); |
| 33 | #define spi_unlock() enable_interrupts(); |
| 34 | |
| 35 | extern unsigned long spi_flags; |
| 36 | extern unsigned char spi_idle; |
| 37 | |
| 38 | int spi_init(void); |
| 39 | |
| 40 | static inline unsigned char spi_read(void) |
| 41 | { |
| 42 | unsigned char b; |
| 43 | |
| 44 | PUT8(S0SPDR, spi_idle); |
| 45 | while (!(GET8(S0SPSR) & SPIF)); |
| 46 | b = GET8(S0SPDR); |
| 47 | |
| 48 | return b; |
| 49 | } |
| 50 | |
| 51 | static inline void spi_write(unsigned char b) |
| 52 | { |
| 53 | PUT8(S0SPDR, b); |
| 54 | while (!(GET8(S0SPSR) & SPIF)); |
| 55 | GET8(S0SPDR); /* this will clear the SPIF bit */ |
| 56 | } |
| 57 | |
| 58 | static inline void spi_set_clock(unsigned char clk_value) |
| 59 | { |
| 60 | PUT8(S0SPCCR, clk_value); |
| 61 | } |
| 62 | |
| 63 | static inline void spi_set_cfg(unsigned char phase, |
| 64 | unsigned char polarity, |
| 65 | unsigned char lsbf) |
| 66 | { |
| 67 | unsigned char v = 0x20; /* master bit set */ |
| 68 | |
| 69 | if (phase) |
| 70 | v |= 0x08; /* set phase bit */ |
| 71 | if (polarity) { |
| 72 | v |= 0x10; /* set polarity bit */ |
| 73 | spi_idle = 0xFF; |
| 74 | } else { |
| 75 | spi_idle = 0x00; |
| 76 | } |
| 77 | if (lsbf) |
| 78 | v |= 0x40; /* set lsbf bit */ |
| 79 | |
| 80 | PUT8(S0SPCR, v); |
| 81 | } |
| 82 | #endif /* SPI_H */ |