diff options
author | Cástor Muñoz <cmvidal@gmail.com> | 2016-02-05 00:48:03 +0100 |
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committer | Cástor Muñoz <cmvidal@gmail.com> | 2016-08-19 00:15:36 +0200 |
commit | 57a44854e30e5a6b082b3816c0ca0ff83240474f (patch) | |
tree | 42ec9b9f87453e2690a2a68b8e6cbf816c52115f /firmware/target/arm/s5l8702 | |
parent | 9d121cfd51185b21be6551be2599bf2edcc8fe40 (diff) | |
download | rockbox-57a44854e30e5a6b082b3816c0ca0ff83240474f.tar.gz rockbox-57a44854e30e5a6b082b3816c0ca0ff83240474f.zip |
iPod Classic: SPI driver for bootloader
Based on emCORE.
Low level functions that do not depend on Rockbox kernel,
intended to be used by the bootloader, dualboot-installer,
RB drivers or other .dfu tools.
Change-Id: Iad369627b55bf1778eab437424072f1a653e4db6
Diffstat (limited to 'firmware/target/arm/s5l8702')
-rw-r--r-- | firmware/target/arm/s5l8702/spi-s5l8702.c | 112 | ||||
-rw-r--r-- | firmware/target/arm/s5l8702/spi-s5l8702.h | 32 |
2 files changed, 144 insertions, 0 deletions
diff --git a/firmware/target/arm/s5l8702/spi-s5l8702.c b/firmware/target/arm/s5l8702/spi-s5l8702.c new file mode 100644 index 0000000000..581c0818d3 --- /dev/null +++ b/firmware/target/arm/s5l8702/spi-s5l8702.c @@ -0,0 +1,112 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: + * + * Copyright © 2009 Michael Sparmann + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ +#include <stdint.h> +#include <stdbool.h> + +#include "config.h" +#include "s5l8702.h" +#include "clocking-s5l8702.h" +#include "spi-s5l8702.h" + +#define SPI_N_PORT 3 + +static int clkdiv[SPI_N_PORT] = {4, 4, 4}; + +/* configure SPI clock, speed is PClk/(div+1) (TBC) */ +void spi_clkdiv(int port, int div) +{ + clkdiv[port] = div; +} + +/* state: 1 -> route GPIO ports to SPI controller + * 0 -> set GPIO to lowest power consumption + */ +void spi_init(int port, bool state) +{ + uint32_t val = state ? 0x2222 : 0xEEEF; + switch (port) + { + case 0: + PCON0 = (PCON0 & ~0xffff) | val; + break; + case 1: + PCON6 = (PCON6 & ~0xffff0000) | (val << 16); + break; + case 2: + PCONE = (PCONE & ~0xff000000) | (val << 24); + PCONF = (PCONF & ~0xff) | (val >> 8); + break; + } +} + +/* nSS pin: output LOW -> external device SLAVE + * output HIGH -> deactivate external SLAVE device + * input LOW -> SLAVE condition (external MASTER device) + */ +void spi_ce(int port, bool state) +{ + uint32_t level = state ? 0 : 1; + switch (port) + { + case 0: GPIOCMD = 0x0000e | level; break; + case 1: GPIOCMD = 0x6040e | level; break; + case 2: GPIOCMD = 0xe060e | level; break; + } +} + +void spi_prepare(int port) +{ + clockgate_enable(SPICLKGATE(port), true); + SPISTATUS(port) = 0xf; + SPICTRL(port) |= 0xc; + SPICLKDIV(port) = clkdiv[port]; + SPIPIN(port) = 6; + SPISETUP(port) = 0x10618; + SPICTRL(port) |= 0xc; + SPICTRL(port) = 1; +} + +void spi_release(int port) +{ + clockgate_enable(SPICLKGATE(port), false); +} + +uint32_t spi_write(int port, uint32_t data) +{ + SPIRXLIMIT(port) = 1; + while ((SPISTATUS(port) & 0x1f0) == 0x100); + SPITXDATA(port) = data; + while (!(SPISTATUS(port) & 0x3e00)); + return SPIRXDATA(port); +} + +void spi_read(int port, uint32_t size, void* buf) +{ + uint8_t* buffer = (uint8_t*)buf; + SPIRXLIMIT(port) = size; + SPISETUP(port) |= 1; + while (size--) + { + while (!(SPISTATUS(port) & 0x3e00)); + *buffer++ = SPIRXDATA(port); + } + SPISETUP(port) &= ~1; +} diff --git a/firmware/target/arm/s5l8702/spi-s5l8702.h b/firmware/target/arm/s5l8702/spi-s5l8702.h new file mode 100644 index 0000000000..98235c1840 --- /dev/null +++ b/firmware/target/arm/s5l8702/spi-s5l8702.h @@ -0,0 +1,32 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: + * + * Copyright © 2009 Michael Sparmann + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ +#ifndef __SPI_S5L8702_H__ +#define __SPI_S5L8702_H__ + +void spi_init(int port, bool state); +void spi_ce(int port, bool state); +void spi_prepare(int port); +void spi_release(int port); +void spi_read(int port, uint32_t size, void* buf); +uint32_t spi_write(int port, uint32_t data); +void spi_clkdiv(int port, int div); + +#endif /* __SPI_S5L8702_H__ */ |