1*61c1775fSDan Murphy /* 2*61c1775fSDan Murphy * Copyright 2013 Texas Instruments, Inc. 3*61c1775fSDan Murphy * Author: Dan Murphy <dmurphy@ti.com> 4*61c1775fSDan Murphy * 5*61c1775fSDan Murphy * Derived work from the pca953x.c driver 6*61c1775fSDan Murphy * 7*61c1775fSDan Murphy * This program is free software; you can redistribute it and/or 8*61c1775fSDan Murphy * modify it under the terms of the GNU General Public License as 9*61c1775fSDan Murphy * published by the Free Software Foundation; either version 2 of 10*61c1775fSDan Murphy * the License, or (at your option) any later version. 11*61c1775fSDan Murphy * 12*61c1775fSDan Murphy * This program is distributed in the hope that it will be useful, 13*61c1775fSDan Murphy * but WITHOUT ANY WARRANTY; without even the implied warranty of 14*61c1775fSDan Murphy * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15*61c1775fSDan Murphy * GNU General Public License for more details. 16*61c1775fSDan Murphy * 17*61c1775fSDan Murphy * You should have received a copy of the GNU General Public License 18*61c1775fSDan Murphy * along with this program; if not, write to the Free Software 19*61c1775fSDan Murphy * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20*61c1775fSDan Murphy * MA 02111-1307 USA 21*61c1775fSDan Murphy */ 22*61c1775fSDan Murphy 23*61c1775fSDan Murphy #include <common.h> 24*61c1775fSDan Murphy #include <i2c.h> 25*61c1775fSDan Murphy #include <tca642x.h> 26*61c1775fSDan Murphy 27*61c1775fSDan Murphy /* tca642x register address definitions */ 28*61c1775fSDan Murphy struct tca642x_bank_info tca642x_regs[] = { 29*61c1775fSDan Murphy { .input_reg = 0x00, 30*61c1775fSDan Murphy .output_reg = 0x04, 31*61c1775fSDan Murphy .polarity_reg = 0x08, 32*61c1775fSDan Murphy .configuration_reg = 0x0c }, 33*61c1775fSDan Murphy { .input_reg = 0x01, 34*61c1775fSDan Murphy .output_reg = 0x05, 35*61c1775fSDan Murphy .polarity_reg = 0x09, 36*61c1775fSDan Murphy .configuration_reg = 0x0d }, 37*61c1775fSDan Murphy { .input_reg = 0x02, 38*61c1775fSDan Murphy .output_reg = 0x06, 39*61c1775fSDan Murphy .polarity_reg = 0x0a, 40*61c1775fSDan Murphy .configuration_reg = 0x0e }, 41*61c1775fSDan Murphy }; 42*61c1775fSDan Murphy 43*61c1775fSDan Murphy /* 44*61c1775fSDan Murphy * Modify masked bits in register 45*61c1775fSDan Murphy */ 46*61c1775fSDan Murphy static int tca642x_reg_write(uchar chip, uint8_t addr, 47*61c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 48*61c1775fSDan Murphy { 49*61c1775fSDan Murphy uint8_t valw; 50*61c1775fSDan Murphy int org_bus_num; 51*61c1775fSDan Murphy int ret; 52*61c1775fSDan Murphy 53*61c1775fSDan Murphy org_bus_num = i2c_get_bus_num(); 54*61c1775fSDan Murphy i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); 55*61c1775fSDan Murphy 56*61c1775fSDan Murphy if (i2c_read(chip, addr, 1, (uint8_t *)&valw, 1)) { 57*61c1775fSDan Murphy printf("Could not read before writing\n"); 58*61c1775fSDan Murphy ret = -1; 59*61c1775fSDan Murphy goto error; 60*61c1775fSDan Murphy } 61*61c1775fSDan Murphy valw &= ~reg_bit; 62*61c1775fSDan Murphy valw |= data; 63*61c1775fSDan Murphy 64*61c1775fSDan Murphy ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1); 65*61c1775fSDan Murphy 66*61c1775fSDan Murphy error: 67*61c1775fSDan Murphy i2c_set_bus_num(org_bus_num); 68*61c1775fSDan Murphy return ret; 69*61c1775fSDan Murphy } 70*61c1775fSDan Murphy 71*61c1775fSDan Murphy static int tca642x_reg_read(uchar chip, uint8_t addr, uint8_t *data) 72*61c1775fSDan Murphy { 73*61c1775fSDan Murphy uint8_t valw; 74*61c1775fSDan Murphy int org_bus_num; 75*61c1775fSDan Murphy int ret = 0; 76*61c1775fSDan Murphy 77*61c1775fSDan Murphy org_bus_num = i2c_get_bus_num(); 78*61c1775fSDan Murphy i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); 79*61c1775fSDan Murphy if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) { 80*61c1775fSDan Murphy ret = -1; 81*61c1775fSDan Murphy goto error; 82*61c1775fSDan Murphy } 83*61c1775fSDan Murphy 84*61c1775fSDan Murphy *data = valw; 85*61c1775fSDan Murphy 86*61c1775fSDan Murphy error: 87*61c1775fSDan Murphy i2c_set_bus_num(org_bus_num); 88*61c1775fSDan Murphy return ret; 89*61c1775fSDan Murphy } 90*61c1775fSDan Murphy 91*61c1775fSDan Murphy /* 92*61c1775fSDan Murphy * Set output value of IO pins in 'reg_bit' to corresponding value in 'data' 93*61c1775fSDan Murphy * 0 = low, 1 = high 94*61c1775fSDan Murphy */ 95*61c1775fSDan Murphy int tca642x_set_val(uchar chip, uint8_t gpio_bank, 96*61c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 97*61c1775fSDan Murphy { 98*61c1775fSDan Murphy uint8_t out_reg = tca642x_regs[gpio_bank].output_reg; 99*61c1775fSDan Murphy 100*61c1775fSDan Murphy return tca642x_reg_write(chip, out_reg, reg_bit, data); 101*61c1775fSDan Murphy } 102*61c1775fSDan Murphy 103*61c1775fSDan Murphy /* 104*61c1775fSDan Murphy * Set read polarity of IO pins in 'reg_bit' to corresponding value in 'data' 105*61c1775fSDan Murphy * 0 = read pin value, 1 = read inverted pin value 106*61c1775fSDan Murphy */ 107*61c1775fSDan Murphy int tca642x_set_pol(uchar chip, uint8_t gpio_bank, 108*61c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 109*61c1775fSDan Murphy { 110*61c1775fSDan Murphy uint8_t pol_reg = tca642x_regs[gpio_bank].polarity_reg; 111*61c1775fSDan Murphy 112*61c1775fSDan Murphy return tca642x_reg_write(chip, pol_reg, reg_bit, data); 113*61c1775fSDan Murphy } 114*61c1775fSDan Murphy 115*61c1775fSDan Murphy /* 116*61c1775fSDan Murphy * Set direction of IO pins in 'reg_bit' to corresponding value in 'data' 117*61c1775fSDan Murphy * 0 = output, 1 = input 118*61c1775fSDan Murphy */ 119*61c1775fSDan Murphy int tca642x_set_dir(uchar chip, uint8_t gpio_bank, 120*61c1775fSDan Murphy uint8_t reg_bit, uint8_t data) 121*61c1775fSDan Murphy { 122*61c1775fSDan Murphy uint8_t config_reg = tca642x_regs[gpio_bank].configuration_reg; 123*61c1775fSDan Murphy 124*61c1775fSDan Murphy return tca642x_reg_write(chip, config_reg, reg_bit, data); 125*61c1775fSDan Murphy } 126*61c1775fSDan Murphy 127*61c1775fSDan Murphy /* 128*61c1775fSDan Murphy * Read current logic level of all IO pins 129*61c1775fSDan Murphy */ 130*61c1775fSDan Murphy int tca642x_get_val(uchar chip, uint8_t gpio_bank) 131*61c1775fSDan Murphy { 132*61c1775fSDan Murphy uint8_t val; 133*61c1775fSDan Murphy uint8_t in_reg = tca642x_regs[gpio_bank].input_reg; 134*61c1775fSDan Murphy 135*61c1775fSDan Murphy if (tca642x_reg_read(chip, in_reg, &val) < 0) 136*61c1775fSDan Murphy return -1; 137*61c1775fSDan Murphy 138*61c1775fSDan Murphy return (int)val; 139*61c1775fSDan Murphy } 140*61c1775fSDan Murphy 141*61c1775fSDan Murphy /* 142*61c1775fSDan Murphy * Set the inital register states for the tca642x gpio expander 143*61c1775fSDan Murphy */ 144*61c1775fSDan Murphy int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[]) 145*61c1775fSDan Murphy { 146*61c1775fSDan Murphy int i, ret; 147*61c1775fSDan Murphy uint8_t config_reg; 148*61c1775fSDan Murphy uint8_t polarity_reg; 149*61c1775fSDan Murphy uint8_t output_reg; 150*61c1775fSDan Murphy 151*61c1775fSDan Murphy for (i = 0; i < 3; i++) { 152*61c1775fSDan Murphy config_reg = tca642x_regs[i].configuration_reg; 153*61c1775fSDan Murphy ret = tca642x_reg_write(chip, config_reg, 0xff, 154*61c1775fSDan Murphy init_data[i].configuration_reg); 155*61c1775fSDan Murphy polarity_reg = tca642x_regs[i].polarity_reg; 156*61c1775fSDan Murphy ret = tca642x_reg_write(chip, polarity_reg, 0xff, 157*61c1775fSDan Murphy init_data[i].polarity_reg); 158*61c1775fSDan Murphy output_reg = tca642x_regs[i].output_reg; 159*61c1775fSDan Murphy ret = tca642x_reg_write(chip, output_reg, 0xff, 160*61c1775fSDan Murphy init_data[i].output_reg); 161*61c1775fSDan Murphy } 162*61c1775fSDan Murphy 163*61c1775fSDan Murphy return ret; 164*61c1775fSDan Murphy } 165*61c1775fSDan Murphy 166*61c1775fSDan Murphy #ifdef CONFIG_CMD_TCA642X 167*61c1775fSDan Murphy /* 168*61c1775fSDan Murphy * Display tca642x information 169*61c1775fSDan Murphy */ 170*61c1775fSDan Murphy static int tca642x_info(uchar chip) 171*61c1775fSDan Murphy { 172*61c1775fSDan Murphy int i, j; 173*61c1775fSDan Murphy uint8_t data; 174*61c1775fSDan Murphy 175*61c1775fSDan Murphy printf("tca642x@ 0x%x (%d pins):\n", chip, 24); 176*61c1775fSDan Murphy for (i = 0; i < 3; i++) { 177*61c1775fSDan Murphy printf("Bank %i\n", i); 178*61c1775fSDan Murphy if (tca642x_reg_read(chip, 179*61c1775fSDan Murphy tca642x_regs[i].configuration_reg, 180*61c1775fSDan Murphy &data) < 0) 181*61c1775fSDan Murphy return -1; 182*61c1775fSDan Murphy printf("\tConfiguration: "); 183*61c1775fSDan Murphy for (j = 7; j >= 0; j--) 184*61c1775fSDan Murphy printf("%c", data & (1 << j) ? 'i' : 'o'); 185*61c1775fSDan Murphy printf("\n"); 186*61c1775fSDan Murphy 187*61c1775fSDan Murphy if (tca642x_reg_read(chip, 188*61c1775fSDan Murphy tca642x_regs[i].polarity_reg, &data) < 0) 189*61c1775fSDan Murphy return -1; 190*61c1775fSDan Murphy printf("\tPolarity: "); 191*61c1775fSDan Murphy for (j = 7; j >= 0; j--) 192*61c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 193*61c1775fSDan Murphy printf("\n"); 194*61c1775fSDan Murphy 195*61c1775fSDan Murphy if (tca642x_reg_read(chip, 196*61c1775fSDan Murphy tca642x_regs[i].input_reg, &data) < 0) 197*61c1775fSDan Murphy return -1; 198*61c1775fSDan Murphy printf("\tInput value: "); 199*61c1775fSDan Murphy for (j = 7; j >= 0; j--) 200*61c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 201*61c1775fSDan Murphy printf("\n"); 202*61c1775fSDan Murphy 203*61c1775fSDan Murphy if (tca642x_reg_read(chip, 204*61c1775fSDan Murphy tca642x_regs[i].output_reg, &data) < 0) 205*61c1775fSDan Murphy return -1; 206*61c1775fSDan Murphy printf("\tOutput value: "); 207*61c1775fSDan Murphy for (j = 7; j >= 0; j--) 208*61c1775fSDan Murphy printf("%c", data & (1 << j) ? '1' : '0'); 209*61c1775fSDan Murphy printf("\n"); 210*61c1775fSDan Murphy } 211*61c1775fSDan Murphy 212*61c1775fSDan Murphy return 0; 213*61c1775fSDan Murphy } 214*61c1775fSDan Murphy 215*61c1775fSDan Murphy cmd_tbl_t cmd_tca642x[] = { 216*61c1775fSDan Murphy U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""), 217*61c1775fSDan Murphy U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""), 218*61c1775fSDan Murphy U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""), 219*61c1775fSDan Murphy U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""), 220*61c1775fSDan Murphy U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""), 221*61c1775fSDan Murphy }; 222*61c1775fSDan Murphy 223*61c1775fSDan Murphy int do_tca642x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 224*61c1775fSDan Murphy { 225*61c1775fSDan Murphy static uchar chip = CONFIG_SYS_I2C_TCA642X_ADDR; 226*61c1775fSDan Murphy int ret = CMD_RET_USAGE, val; 227*61c1775fSDan Murphy uint8_t gpio_bank = 0; 228*61c1775fSDan Murphy uint8_t bank_shift; 229*61c1775fSDan Murphy ulong ul_arg2 = 0; 230*61c1775fSDan Murphy ulong ul_arg3 = 0; 231*61c1775fSDan Murphy cmd_tbl_t *c; 232*61c1775fSDan Murphy 233*61c1775fSDan Murphy c = find_cmd_tbl(argv[1], cmd_tca642x, ARRAY_SIZE(cmd_tca642x)); 234*61c1775fSDan Murphy 235*61c1775fSDan Murphy /* All commands but "device" require 'maxargs' arguments */ 236*61c1775fSDan Murphy if (!c || 237*61c1775fSDan Murphy !((argc == (c->maxargs)) || 238*61c1775fSDan Murphy (((int)c->cmd == TCA642X_CMD_DEVICE) && 239*61c1775fSDan Murphy (argc == (c->maxargs - 1))))) { 240*61c1775fSDan Murphy return CMD_RET_USAGE; 241*61c1775fSDan Murphy } 242*61c1775fSDan Murphy 243*61c1775fSDan Murphy /* arg2 used as chip number or pin number */ 244*61c1775fSDan Murphy if (argc > 2) 245*61c1775fSDan Murphy ul_arg2 = simple_strtoul(argv[2], NULL, 10); 246*61c1775fSDan Murphy 247*61c1775fSDan Murphy /* arg3 used as pin or invert value */ 248*61c1775fSDan Murphy if (argc > 3) { 249*61c1775fSDan Murphy ul_arg3 = simple_strtoul(argv[3], NULL, 10) & 0x1; 250*61c1775fSDan Murphy if (ul_arg2 <= 7) { 251*61c1775fSDan Murphy gpio_bank = 0; 252*61c1775fSDan Murphy } else if ((ul_arg2 >= 10) && (ul_arg2 <= 17)) { 253*61c1775fSDan Murphy gpio_bank = 1; 254*61c1775fSDan Murphy } else if ((ul_arg2 >= 20) && (ul_arg2 <= 27)) { 255*61c1775fSDan Murphy gpio_bank = 2; 256*61c1775fSDan Murphy } else { 257*61c1775fSDan Murphy printf("Requested pin is not available\n"); 258*61c1775fSDan Murphy ret = CMD_RET_FAILURE; 259*61c1775fSDan Murphy goto error; 260*61c1775fSDan Murphy } 261*61c1775fSDan Murphy } 262*61c1775fSDan Murphy 263*61c1775fSDan Murphy switch ((int)c->cmd) { 264*61c1775fSDan Murphy case TCA642X_CMD_INFO: 265*61c1775fSDan Murphy ret = tca642x_info(chip); 266*61c1775fSDan Murphy if (ret) 267*61c1775fSDan Murphy ret = CMD_RET_FAILURE; 268*61c1775fSDan Murphy break; 269*61c1775fSDan Murphy 270*61c1775fSDan Murphy case TCA642X_CMD_DEVICE: 271*61c1775fSDan Murphy if (argc == 3) 272*61c1775fSDan Murphy chip = (uint8_t)ul_arg2; 273*61c1775fSDan Murphy printf("Current device address: 0x%x\n", chip); 274*61c1775fSDan Murphy ret = CMD_RET_SUCCESS; 275*61c1775fSDan Murphy break; 276*61c1775fSDan Murphy 277*61c1775fSDan Murphy case TCA642X_CMD_INPUT: 278*61c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 279*61c1775fSDan Murphy ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), 280*61c1775fSDan Murphy TCA642X_DIR_IN << bank_shift); 281*61c1775fSDan Murphy val = (tca642x_get_val(chip, gpio_bank) & 282*61c1775fSDan Murphy (1 << bank_shift)) != 0; 283*61c1775fSDan Murphy 284*61c1775fSDan Murphy if (ret) 285*61c1775fSDan Murphy ret = CMD_RET_FAILURE; 286*61c1775fSDan Murphy else 287*61c1775fSDan Murphy printf("chip 0x%02x, pin 0x%lx = %d\n", chip, 288*61c1775fSDan Murphy ul_arg2, val); 289*61c1775fSDan Murphy break; 290*61c1775fSDan Murphy 291*61c1775fSDan Murphy case TCA642X_CMD_OUTPUT: 292*61c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 293*61c1775fSDan Murphy ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), 294*61c1775fSDan Murphy (TCA642X_DIR_OUT << bank_shift)); 295*61c1775fSDan Murphy if (!ret) 296*61c1775fSDan Murphy ret = tca642x_set_val(chip, 297*61c1775fSDan Murphy gpio_bank, (1 << bank_shift), 298*61c1775fSDan Murphy (ul_arg3 << bank_shift)); 299*61c1775fSDan Murphy if (ret) 300*61c1775fSDan Murphy ret = CMD_RET_FAILURE; 301*61c1775fSDan Murphy break; 302*61c1775fSDan Murphy 303*61c1775fSDan Murphy case TCA642X_CMD_INVERT: 304*61c1775fSDan Murphy bank_shift = ul_arg2 - (gpio_bank * 10); 305*61c1775fSDan Murphy ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift), 306*61c1775fSDan Murphy (ul_arg3 << bank_shift)); 307*61c1775fSDan Murphy if (ret) 308*61c1775fSDan Murphy ret = CMD_RET_FAILURE; 309*61c1775fSDan Murphy break; 310*61c1775fSDan Murphy } 311*61c1775fSDan Murphy error: 312*61c1775fSDan Murphy if (ret == CMD_RET_FAILURE) 313*61c1775fSDan Murphy eprintf("Error talking to chip at 0x%x\n", chip); 314*61c1775fSDan Murphy 315*61c1775fSDan Murphy return ret; 316*61c1775fSDan Murphy } 317*61c1775fSDan Murphy 318*61c1775fSDan Murphy U_BOOT_CMD( 319*61c1775fSDan Murphy tca642x, 5, 1, do_tca642x, 320*61c1775fSDan Murphy "tca642x gpio access", 321*61c1775fSDan Murphy "device [dev]\n" 322*61c1775fSDan Murphy " - show or set current device address\n" 323*61c1775fSDan Murphy "tca642x info\n" 324*61c1775fSDan Murphy " - display info for current chip\n" 325*61c1775fSDan Murphy "tca642x output pin 0|1\n" 326*61c1775fSDan Murphy " - set pin as output and drive low or high\n" 327*61c1775fSDan Murphy "tca642x invert pin 0|1\n" 328*61c1775fSDan Murphy " - disable/enable polarity inversion for reads\n" 329*61c1775fSDan Murphy "tca642x input pin\n" 330*61c1775fSDan Murphy " - set pin as input and read value" 331*61c1775fSDan Murphy ); 332*61c1775fSDan Murphy 333*61c1775fSDan Murphy #endif /* CONFIG_CMD_TCA642X */ 334