161c1775fSDan Murphy /* 261c1775fSDan Murphy * Copyright 2013 Texas Instruments, Inc. 361c1775fSDan Murphy * Author: Dan Murphy <dmurphy@ti.com> 461c1775fSDan Murphy * 561c1775fSDan Murphy * Derived work from the pca953x.c driver 661c1775fSDan Murphy * 761c1775fSDan Murphy * This program is free software; you can redistribute it and/or 861c1775fSDan Murphy * modify it under the terms of the GNU General Public License as 961c1775fSDan Murphy * published by the Free Software Foundation; either version 2 of 1061c1775fSDan Murphy * the License, or (at your option) any later version. 1161c1775fSDan Murphy * 1261c1775fSDan Murphy * This program is distributed in the hope that it will be useful, 1361c1775fSDan Murphy * but WITHOUT ANY WARRANTY; without even the implied warranty of 1461c1775fSDan Murphy * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1561c1775fSDan Murphy * GNU General Public License for more details. 1661c1775fSDan Murphy * 1761c1775fSDan Murphy * You should have received a copy of the GNU General Public License 1861c1775fSDan Murphy * along with this program; if not, write to the Free Software 1961c1775fSDan Murphy * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 2061c1775fSDan Murphy * MA 02111-1307 USA 2161c1775fSDan Murphy */ 2261c1775fSDan Murphy 2361c1775fSDan Murphy #include <common.h> 2461c1775fSDan Murphy #include <i2c.h> 2561c1775fSDan Murphy #include <tca642x.h> 2661c1775fSDan Murphy 2761c1775fSDan Murphy /* tca642x register address definitions */ 2861c1775fSDan Murphy struct tca642x_bank_info tca642x_regs[] = { 2961c1775fSDan Murphy { .input_reg = 0x00, 3061c1775fSDan Murphy .output_reg = 0x04, 3161c1775fSDan Murphy .polarity_reg = 0x08, 3261c1775fSDan Murphy .configuration_reg = 0x0c }, 3361c1775fSDan Murphy { .input_reg = 0x01, 3461c1775fSDan Murphy .output_reg = 0x05, 3561c1775fSDan Murphy .polarity_reg = 0x09, 3661c1775fSDan Murphy .configuration_reg = 0x0d }, 3761c1775fSDan Murphy { .input_reg = 0x02, 3861c1775fSDan Murphy .output_reg = 0x06, 3961c1775fSDan Murphy .polarity_reg = 0x0a, 4061c1775fSDan Murphy .configuration_reg = 0x0e }, 4161c1775fSDan Murphy }; 4261c1775fSDan Murphy 4361c1775fSDan Murphy /* 4461c1775fSDan Murphy * Modify masked bits in register 4561c1775fSDan Murphy */ 4661c1775fSDan Murphy static int tca642x_reg_write(uchar chip, uint8_t addr, 4761c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 4861c1775fSDan Murphy { 4961c1775fSDan Murphy uint8_t valw; 5061c1775fSDan Murphy int org_bus_num; 5161c1775fSDan Murphy int ret; 5261c1775fSDan Murphy 5361c1775fSDan Murphy org_bus_num = i2c_get_bus_num(); 5461c1775fSDan Murphy i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); 5561c1775fSDan Murphy 5661c1775fSDan Murphy if (i2c_read(chip, addr, 1, (uint8_t *)&valw, 1)) { 5761c1775fSDan Murphy printf("Could not read before writing\n"); 5861c1775fSDan Murphy ret = -1; 5961c1775fSDan Murphy goto error; 6061c1775fSDan Murphy } 6161c1775fSDan Murphy valw &= ~reg_bit; 6261c1775fSDan Murphy valw |= data; 6361c1775fSDan Murphy 6461c1775fSDan Murphy ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1); 6561c1775fSDan Murphy 6661c1775fSDan Murphy error: 6761c1775fSDan Murphy i2c_set_bus_num(org_bus_num); 6861c1775fSDan Murphy return ret; 6961c1775fSDan Murphy } 7061c1775fSDan Murphy 7161c1775fSDan Murphy static int tca642x_reg_read(uchar chip, uint8_t addr, uint8_t *data) 7261c1775fSDan Murphy { 7361c1775fSDan Murphy uint8_t valw; 7461c1775fSDan Murphy int org_bus_num; 7561c1775fSDan Murphy int ret = 0; 7661c1775fSDan Murphy 7761c1775fSDan Murphy org_bus_num = i2c_get_bus_num(); 7861c1775fSDan Murphy i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); 7961c1775fSDan Murphy if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) { 8061c1775fSDan Murphy ret = -1; 8161c1775fSDan Murphy goto error; 8261c1775fSDan Murphy } 8361c1775fSDan Murphy 8461c1775fSDan Murphy *data = valw; 8561c1775fSDan Murphy 8661c1775fSDan Murphy error: 8761c1775fSDan Murphy i2c_set_bus_num(org_bus_num); 8861c1775fSDan Murphy return ret; 8961c1775fSDan Murphy } 9061c1775fSDan Murphy 9161c1775fSDan Murphy /* 9261c1775fSDan Murphy * Set output value of IO pins in 'reg_bit' to corresponding value in 'data' 9361c1775fSDan Murphy * 0 = low, 1 = high 9461c1775fSDan Murphy */ 9561c1775fSDan Murphy int tca642x_set_val(uchar chip, uint8_t gpio_bank, 9661c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 9761c1775fSDan Murphy { 9861c1775fSDan Murphy uint8_t out_reg = tca642x_regs[gpio_bank].output_reg; 9961c1775fSDan Murphy 10061c1775fSDan Murphy return tca642x_reg_write(chip, out_reg, reg_bit, data); 10161c1775fSDan Murphy } 10261c1775fSDan Murphy 10361c1775fSDan Murphy /* 10461c1775fSDan Murphy * Set read polarity of IO pins in 'reg_bit' to corresponding value in 'data' 10561c1775fSDan Murphy * 0 = read pin value, 1 = read inverted pin value 10661c1775fSDan Murphy */ 10761c1775fSDan Murphy int tca642x_set_pol(uchar chip, uint8_t gpio_bank, 10861c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 10961c1775fSDan Murphy { 11061c1775fSDan Murphy uint8_t pol_reg = tca642x_regs[gpio_bank].polarity_reg; 11161c1775fSDan Murphy 11261c1775fSDan Murphy return tca642x_reg_write(chip, pol_reg, reg_bit, data); 11361c1775fSDan Murphy } 11461c1775fSDan Murphy 11561c1775fSDan Murphy /* 11661c1775fSDan Murphy * Set direction of IO pins in 'reg_bit' to corresponding value in 'data' 11761c1775fSDan Murphy * 0 = output, 1 = input 11861c1775fSDan Murphy */ 11961c1775fSDan Murphy int tca642x_set_dir(uchar chip, uint8_t gpio_bank, 12061c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 12161c1775fSDan Murphy { 12261c1775fSDan Murphy uint8_t config_reg = tca642x_regs[gpio_bank].configuration_reg; 12361c1775fSDan Murphy 12461c1775fSDan Murphy return tca642x_reg_write(chip, config_reg, reg_bit, data); 12561c1775fSDan Murphy } 12661c1775fSDan Murphy 12761c1775fSDan Murphy /* 12861c1775fSDan Murphy * Read current logic level of all IO pins 12961c1775fSDan Murphy */ 13061c1775fSDan Murphy int tca642x_get_val(uchar chip, uint8_t gpio_bank) 13161c1775fSDan Murphy { 13261c1775fSDan Murphy uint8_t val; 13361c1775fSDan Murphy uint8_t in_reg = tca642x_regs[gpio_bank].input_reg; 13461c1775fSDan Murphy 13561c1775fSDan Murphy if (tca642x_reg_read(chip, in_reg, &val) < 0) 13661c1775fSDan Murphy return -1; 13761c1775fSDan Murphy 13861c1775fSDan Murphy return (int)val; 13961c1775fSDan Murphy } 14061c1775fSDan Murphy 14161c1775fSDan Murphy /* 14261c1775fSDan Murphy * Set the inital register states for the tca642x gpio expander 14361c1775fSDan Murphy */ 14461c1775fSDan Murphy int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[]) 14561c1775fSDan Murphy { 14661c1775fSDan Murphy int i, ret; 14761c1775fSDan Murphy uint8_t config_reg; 14861c1775fSDan Murphy uint8_t polarity_reg; 14961c1775fSDan Murphy uint8_t output_reg; 15061c1775fSDan Murphy 15161c1775fSDan Murphy for (i = 0; i < 3; i++) { 15261c1775fSDan Murphy config_reg = tca642x_regs[i].configuration_reg; 15361c1775fSDan Murphy ret = tca642x_reg_write(chip, config_reg, 0xff, 15461c1775fSDan Murphy init_data[i].configuration_reg); 15561c1775fSDan Murphy polarity_reg = tca642x_regs[i].polarity_reg; 15661c1775fSDan Murphy ret = tca642x_reg_write(chip, polarity_reg, 0xff, 15761c1775fSDan Murphy init_data[i].polarity_reg); 15861c1775fSDan Murphy output_reg = tca642x_regs[i].output_reg; 15961c1775fSDan Murphy ret = tca642x_reg_write(chip, output_reg, 0xff, 16061c1775fSDan Murphy init_data[i].output_reg); 16161c1775fSDan Murphy } 16261c1775fSDan Murphy 16361c1775fSDan Murphy return ret; 16461c1775fSDan Murphy } 16561c1775fSDan Murphy 166*bb2277b3STom Rini #if defined(CONFIG_CMD_TCA642X) && !defined(CONFIG_SPL_BUILD) 16761c1775fSDan Murphy /* 16861c1775fSDan Murphy * Display tca642x information 16961c1775fSDan Murphy */ 17061c1775fSDan Murphy static int tca642x_info(uchar chip) 17161c1775fSDan Murphy { 17261c1775fSDan Murphy int i, j; 17361c1775fSDan Murphy uint8_t data; 17461c1775fSDan Murphy 17561c1775fSDan Murphy printf("tca642x@ 0x%x (%d pins):\n", chip, 24); 17661c1775fSDan Murphy for (i = 0; i < 3; i++) { 17761c1775fSDan Murphy printf("Bank %i\n", i); 17861c1775fSDan Murphy if (tca642x_reg_read(chip, 17961c1775fSDan Murphy tca642x_regs[i].configuration_reg, 18061c1775fSDan Murphy &data) < 0) 18161c1775fSDan Murphy return -1; 18261c1775fSDan Murphy printf("\tConfiguration: "); 18361c1775fSDan Murphy for (j = 7; j >= 0; j--) 18461c1775fSDan Murphy printf("%c", data & (1 << j) ? 'i' : 'o'); 18561c1775fSDan Murphy printf("\n"); 18661c1775fSDan Murphy 18761c1775fSDan Murphy if (tca642x_reg_read(chip, 18861c1775fSDan Murphy tca642x_regs[i].polarity_reg, &data) < 0) 18961c1775fSDan Murphy return -1; 19061c1775fSDan Murphy printf("\tPolarity: "); 19161c1775fSDan Murphy for (j = 7; j >= 0; j--) 19261c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 19361c1775fSDan Murphy printf("\n"); 19461c1775fSDan Murphy 19561c1775fSDan Murphy if (tca642x_reg_read(chip, 19661c1775fSDan Murphy tca642x_regs[i].input_reg, &data) < 0) 19761c1775fSDan Murphy return -1; 19861c1775fSDan Murphy printf("\tInput value: "); 19961c1775fSDan Murphy for (j = 7; j >= 0; j--) 20061c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 20161c1775fSDan Murphy printf("\n"); 20261c1775fSDan Murphy 20361c1775fSDan Murphy if (tca642x_reg_read(chip, 20461c1775fSDan Murphy tca642x_regs[i].output_reg, &data) < 0) 20561c1775fSDan Murphy return -1; 20661c1775fSDan Murphy printf("\tOutput value: "); 20761c1775fSDan Murphy for (j = 7; j >= 0; j--) 20861c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 20961c1775fSDan Murphy printf("\n"); 21061c1775fSDan Murphy } 21161c1775fSDan Murphy 21261c1775fSDan Murphy return 0; 21361c1775fSDan Murphy } 21461c1775fSDan Murphy 215*bb2277b3STom Rini static cmd_tbl_t cmd_tca642x[] = { 21661c1775fSDan Murphy U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""), 21761c1775fSDan Murphy U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""), 21861c1775fSDan Murphy U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""), 21961c1775fSDan Murphy U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""), 22061c1775fSDan Murphy U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""), 22161c1775fSDan Murphy }; 22261c1775fSDan Murphy 223*bb2277b3STom Rini static int do_tca642x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 22461c1775fSDan Murphy { 22561c1775fSDan Murphy static uchar chip = CONFIG_SYS_I2C_TCA642X_ADDR; 22661c1775fSDan Murphy int ret = CMD_RET_USAGE, val; 22761c1775fSDan Murphy uint8_t gpio_bank = 0; 22861c1775fSDan Murphy uint8_t bank_shift; 22961c1775fSDan Murphy ulong ul_arg2 = 0; 23061c1775fSDan Murphy ulong ul_arg3 = 0; 23161c1775fSDan Murphy cmd_tbl_t *c; 23261c1775fSDan Murphy 23361c1775fSDan Murphy c = find_cmd_tbl(argv[1], cmd_tca642x, ARRAY_SIZE(cmd_tca642x)); 23461c1775fSDan Murphy 23561c1775fSDan Murphy /* All commands but "device" require 'maxargs' arguments */ 23661c1775fSDan Murphy if (!c || 23761c1775fSDan Murphy !((argc == (c->maxargs)) || 23861c1775fSDan Murphy (((int)c->cmd == TCA642X_CMD_DEVICE) && 23961c1775fSDan Murphy (argc == (c->maxargs - 1))))) { 24061c1775fSDan Murphy return CMD_RET_USAGE; 24161c1775fSDan Murphy } 24261c1775fSDan Murphy 24361c1775fSDan Murphy /* arg2 used as chip number or pin number */ 24461c1775fSDan Murphy if (argc > 2) 24561c1775fSDan Murphy ul_arg2 = simple_strtoul(argv[2], NULL, 10); 24661c1775fSDan Murphy 24761c1775fSDan Murphy /* arg3 used as pin or invert value */ 24861c1775fSDan Murphy if (argc > 3) { 24961c1775fSDan Murphy ul_arg3 = simple_strtoul(argv[3], NULL, 10) & 0x1; 25061c1775fSDan Murphy if (ul_arg2 <= 7) { 25161c1775fSDan Murphy gpio_bank = 0; 25261c1775fSDan Murphy } else if ((ul_arg2 >= 10) && (ul_arg2 <= 17)) { 25361c1775fSDan Murphy gpio_bank = 1; 25461c1775fSDan Murphy } else if ((ul_arg2 >= 20) && (ul_arg2 <= 27)) { 25561c1775fSDan Murphy gpio_bank = 2; 25661c1775fSDan Murphy } else { 25761c1775fSDan Murphy printf("Requested pin is not available\n"); 25861c1775fSDan Murphy ret = CMD_RET_FAILURE; 25961c1775fSDan Murphy goto error; 26061c1775fSDan Murphy } 26161c1775fSDan Murphy } 26261c1775fSDan Murphy 26361c1775fSDan Murphy switch ((int)c->cmd) { 26461c1775fSDan Murphy case TCA642X_CMD_INFO: 26561c1775fSDan Murphy ret = tca642x_info(chip); 26661c1775fSDan Murphy if (ret) 26761c1775fSDan Murphy ret = CMD_RET_FAILURE; 26861c1775fSDan Murphy break; 26961c1775fSDan Murphy 27061c1775fSDan Murphy case TCA642X_CMD_DEVICE: 27161c1775fSDan Murphy if (argc == 3) 27261c1775fSDan Murphy chip = (uint8_t)ul_arg2; 27361c1775fSDan Murphy printf("Current device address: 0x%x\n", chip); 27461c1775fSDan Murphy ret = CMD_RET_SUCCESS; 27561c1775fSDan Murphy break; 27661c1775fSDan Murphy 27761c1775fSDan Murphy case TCA642X_CMD_INPUT: 27861c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 27961c1775fSDan Murphy ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), 28061c1775fSDan Murphy TCA642X_DIR_IN << bank_shift); 28161c1775fSDan Murphy val = (tca642x_get_val(chip, gpio_bank) & 28261c1775fSDan Murphy (1 << bank_shift)) != 0; 28361c1775fSDan Murphy 28461c1775fSDan Murphy if (ret) 28561c1775fSDan Murphy ret = CMD_RET_FAILURE; 28661c1775fSDan Murphy else 28761c1775fSDan Murphy printf("chip 0x%02x, pin 0x%lx = %d\n", chip, 28861c1775fSDan Murphy ul_arg2, val); 28961c1775fSDan Murphy break; 29061c1775fSDan Murphy 29161c1775fSDan Murphy case TCA642X_CMD_OUTPUT: 29261c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 29361c1775fSDan Murphy ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), 29461c1775fSDan Murphy (TCA642X_DIR_OUT << bank_shift)); 29561c1775fSDan Murphy if (!ret) 29661c1775fSDan Murphy ret = tca642x_set_val(chip, 29761c1775fSDan Murphy gpio_bank, (1 << bank_shift), 29861c1775fSDan Murphy (ul_arg3 << bank_shift)); 29961c1775fSDan Murphy if (ret) 30061c1775fSDan Murphy ret = CMD_RET_FAILURE; 30161c1775fSDan Murphy break; 30261c1775fSDan Murphy 30361c1775fSDan Murphy case TCA642X_CMD_INVERT: 30461c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 30561c1775fSDan Murphy ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift), 30661c1775fSDan Murphy (ul_arg3 << bank_shift)); 30761c1775fSDan Murphy if (ret) 30861c1775fSDan Murphy ret = CMD_RET_FAILURE; 30961c1775fSDan Murphy break; 31061c1775fSDan Murphy } 31161c1775fSDan Murphy error: 31261c1775fSDan Murphy if (ret == CMD_RET_FAILURE) 31361c1775fSDan Murphy eprintf("Error talking to chip at 0x%x\n", chip); 31461c1775fSDan Murphy 31561c1775fSDan Murphy return ret; 31661c1775fSDan Murphy } 31761c1775fSDan Murphy 31861c1775fSDan Murphy U_BOOT_CMD( 31961c1775fSDan Murphy tca642x, 5, 1, do_tca642x, 32061c1775fSDan Murphy "tca642x gpio access", 32161c1775fSDan Murphy "device [dev]\n" 32261c1775fSDan Murphy " - show or set current device address\n" 32361c1775fSDan Murphy "tca642x info\n" 32461c1775fSDan Murphy " - display info for current chip\n" 32561c1775fSDan Murphy "tca642x output pin 0|1\n" 32661c1775fSDan Murphy " - set pin as output and drive low or high\n" 32761c1775fSDan Murphy "tca642x invert pin 0|1\n" 32861c1775fSDan Murphy " - disable/enable polarity inversion for reads\n" 32961c1775fSDan Murphy "tca642x input pin\n" 33061c1775fSDan Murphy " - set pin as input and read value" 33161c1775fSDan Murphy ); 33261c1775fSDan Murphy 33361c1775fSDan Murphy #endif /* CONFIG_CMD_TCA642X */ 334