diff options
| author | fishsoupisgood <github@madingley.org> | 2019-04-29 01:17:54 +0100 |
|---|---|---|
| committer | fishsoupisgood <github@madingley.org> | 2019-05-27 03:43:43 +0100 |
| commit | 3f2546b2ef55b661fd8dd69682b38992225e86f6 (patch) | |
| tree | 65ca85f13617aee1dce474596800950f266a456c /roms/u-boot/board/keymile/km83xx/km83xx_i2c.c | |
| download | qemu-master.tar.gz qemu-master.tar.bz2 qemu-master.zip | |
Diffstat (limited to 'roms/u-boot/board/keymile/km83xx/km83xx_i2c.c')
| -rw-r--r-- | roms/u-boot/board/keymile/km83xx/km83xx_i2c.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c b/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c new file mode 100644 index 00000000..c9619375 --- /dev/null +++ b/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c @@ -0,0 +1,71 @@ +/* + * (C) Copyright 2011 + * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <asm/io.h> +#include <linux/ctype.h> +#include "../common/common.h" + +static void i2c_write_start_seq(void) +{ + struct fsl_i2c *dev; + dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); + udelay(DELAY_ABORT_SEQ); + out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA)); + udelay(DELAY_ABORT_SEQ); + out_8(&dev->cr, (I2C_CR_MEN)); +} + +int i2c_make_abort(void) +{ + struct fsl_i2c *dev; + dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); + uchar last; + int nbr_read = 0; + int i = 0; + int ret = 0; + + /* wait after each operation to finsh with a delay */ + out_8(&dev->cr, (I2C_CR_MSTA)); + udelay(DELAY_ABORT_SEQ); + out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA)); + udelay(DELAY_ABORT_SEQ); + in_8(&dev->dr); + udelay(DELAY_ABORT_SEQ); + last = in_8(&dev->dr); + nbr_read++; + + /* + * do read until the last bit is 1, but stop if the full eeprom is + * read. + */ + while (((last & 0x01) != 0x01) && + (nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) { + udelay(DELAY_ABORT_SEQ); + last = in_8(&dev->dr); + nbr_read++; + } + if ((last & 0x01) != 0x01) + ret = -2; + if ((last != 0xff) || (nbr_read > 1)) + printf("[INFO] i2c abort after %d bytes (0x%02x)\n", + nbr_read, last); + udelay(DELAY_ABORT_SEQ); + out_8(&dev->cr, (I2C_CR_MEN)); + udelay(DELAY_ABORT_SEQ); + /* clear status reg */ + out_8(&dev->sr, 0); + + for (i = 0; i < 5; i++) + i2c_write_start_seq(); + if (ret != 0) + printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n", + nbr_read, last); + + return ret; +} |