diff options
Diffstat (limited to 'drivers/i2c/pca9564_i2c.c')
| -rw-r--r-- | drivers/i2c/pca9564_i2c.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/drivers/i2c/pca9564_i2c.c b/drivers/i2c/pca9564_i2c.c deleted file mode 100644 index 4ed0923..0000000 --- a/drivers/i2c/pca9564_i2c.c +++ /dev/null @@ -1,179 +0,0 @@ -/* - * File: drivers/i2c/pca9564.c - * Based on: drivers/i2c/s3c44b0_i2c.c - * Author: - * - * Created: 2009-06-23 - * Description: PCA9564 i2c bridge driver - * - * Modified: - * Copyright 2009 CJSC "NII STT", http://www.niistt.ru/ - * - * Bugs: - * - * SPDX-License-Identifier: GPL-2.0+ - * - * NOTE: This driver should be converted to driver model before June 2017. - * Please see doc/driver-model/i2c-howto.txt for instructions. - */ - -#include <common.h> -#include <i2c.h> -#include <pca9564.h> -#include <asm/io.h> - -#define PCA_STA (CONFIG_PCA9564_BASE + 0) -#define PCA_TO (CONFIG_PCA9564_BASE + 0) -#define PCA_DAT (CONFIG_PCA9564_BASE + (1 << 2)) -#define PCA_ADR (CONFIG_PCA9564_BASE + (2 << 2)) -#define PCA_CON (CONFIG_PCA9564_BASE + (3 << 2)) - -static unsigned char pca_read_reg(unsigned int reg) -{ - return readb((void *)reg); -} - -static void pca_write_reg(unsigned int reg, unsigned char value) -{ - writeb(value, (void *)reg); -} - -static int pca_wait_busy(void) -{ - unsigned int timeout = 10000; - - while (!(pca_read_reg(PCA_CON) & PCA_CON_SI) && --timeout) - udelay(1); - - if (timeout == 0) - debug("I2C timeout!\n"); - - debug("CON = 0x%02x, STA = 0x%02x\n", pca_read_reg(PCA_CON), - pca_read_reg(PCA_STA)); - - return timeout ? 0 : 1; -} - -/*=====================================================================*/ -/* Public Functions */ -/*=====================================================================*/ - -/*----------------------------------------------------------------------- - * Initialization - */ -void i2c_init(int speed, int slaveaddr) -{ - pca_write_reg(PCA_CON, PCA_CON_ENSIO | speed); -} - -/* - * Probe the given I2C chip address. Returns 0 if a chip responded, - * not 0 on failure. - */ - -int i2c_probe(uchar chip) -{ - unsigned char res; - - pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO); - pca_wait_busy(); - - pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO); - - pca_write_reg(PCA_DAT, (chip << 1) | 1); - res = pca_wait_busy(); - - if ((res == 0) && (pca_read_reg(PCA_STA) == 0x48)) - res = 1; - - pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO); - - return res; -} - -/* - * Read/Write interface: - * chip: I2C chip address, range 0..127 - * addr: Memory (register) address within the chip - * alen: Number of bytes to use for addr (typically 1, 2 for larger - * memories, 0 for register type devices with only one - * register) - * buffer: Where to read/write the data - * len: How many bytes to read/write - * - * Returns: 0 on success, not 0 on failure - */ -int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) -{ - int i; - - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); - pca_wait_busy(); - - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - - pca_write_reg(PCA_DAT, (chip << 1)); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - - if (alen > 0) { - pca_write_reg(PCA_DAT, addr); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - } - - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO); - - udelay(500); - - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - - pca_write_reg(PCA_DAT, (chip << 1) | 1); - pca_wait_busy(); - - for (i = 0; i < len; ++i) { - if (i == len - 1) - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - else - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_AA); - - pca_wait_busy(); - buffer[i] = pca_read_reg(PCA_DAT); - - } - - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO); - - return 0; -} - -int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) -{ - int i; - - pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - - pca_write_reg(PCA_DAT, chip << 1); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - - if (alen > 0) { - pca_write_reg(PCA_DAT, addr); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - } - - for (i = 0; i < len; ++i) { - pca_write_reg(PCA_DAT, buffer[i]); - pca_wait_busy(); - pca_write_reg(PCA_CON, PCA_CON_ENSIO); - } - - pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO); - - return 0; -} |