| |
| int pwm_voltage_table[][2] = { |
| { 0x1c0000, 860}, |
| { 0x1b0001, 870}, |
| { 0x1a0002, 880}, |
| { 0x190003, 890}, |
| { 0x180004, 900}, |
| { 0x170005, 910}, |
| { 0x160006, 920}, |
| { 0x150007, 930}, |
| { 0x140008, 940}, |
| { 0x130009, 950}, |
| { 0x12000a, 960}, |
| { 0x11000b, 970}, |
| { 0x10000c, 980}, |
| { 0x0f000d, 990}, |
| { 0x0e000e, 1000}, |
| { 0x0d000f, 1010}, |
| { 0x0c0010, 1020}, |
| { 0x0b0011, 1030}, |
| { 0x0a0012, 1040}, |
| { 0x090013, 1050}, |
| { 0x080014, 1060}, |
| { 0x070015, 1070}, |
| { 0x060016, 1080}, |
| { 0x050017, 1090}, |
| { 0x040018, 1100}, |
| { 0x030019, 1110}, |
| { 0x02001a, 1120}, |
| { 0x01001b, 1130}, |
| { 0x00001c, 1140} |
| }; |
| |
| struct scpi_opp_entry cpu_dvfs_tbl[] = { |
| DVFS( 100000000, 860), |
| DVFS( 250000000, 860), |
| DVFS( 500000000, 860), |
| DVFS( 667000000, 900), |
| DVFS(1000000000, 940), |
| DVFS(1200000000, 980), |
| DVFS(1296000000, 1000), |
| DVFS(1416000000, 1020), |
| DVFS(1536000000, 1050), |
| DVFS(1752000000, 1050), |
| DVFS(2016000000, 1050) |
| }; |
| |
| |
| |
| #define P_PIN_MUX_REG3 (*((volatile unsigned *)(0xda834400 + (0x2f << 2)))) |
| #define P_PIN_MUX_REG7 (*((volatile unsigned *)(0xda834400 + (0x33 << 2)))) |
| #define P_PWM_MISC_REG_AB (*((volatile unsigned *)(0xc1100000 + (0x2156 << 2)))) |
| #define P_PWM_PWM_B (*((volatile unsigned *)(0xc1100000 + (0x2155 << 2)))) |
| |
| enum pwm_id { |
| pwm_a = 0, |
| pwm_b, |
| pwm_c, |
| pwm_d, |
| pwm_e, |
| pwm_f, |
| }; |
| |
| |
| void pwm_init(int id) |
| { |
| /* |
| * TODO: support more pwm controllers, right now only support PWM_B |
| */ |
| unsigned int reg; |
| |
| reg = P_PWM_MISC_REG_AB; |
| reg &= ~(0x7f << 16); |
| reg |= ((1 << 23) | (1 << 1)); |
| P_PWM_MISC_REG_AB = reg; |
| /* |
| * default set to max voltage |
| */ |
| P_PWM_PWM_B = pwm_voltage_table[ARRAY_SIZE(pwm_voltage_table) - 1][0]; |
| |
| reg = P_PIN_MUX_REG7; |
| reg &= ~(1 << 22); |
| P_PIN_MUX_REG7 = reg; |
| |
| reg = P_PIN_MUX_REG3; |
| reg &= ~(1 << 22); |
| reg |= (1 << 21); // enable PWM_B |
| P_PIN_MUX_REG3 = reg; |
| |
| _udelay(200); |
| } |
| |
| int dvfs_get_voltage(void) |
| { |
| int i = 0; |
| unsigned int reg_val; |
| |
| reg_val = P_PWM_PWM_B; |
| for (i = 0; i < ARRAY_SIZE(pwm_voltage_table); i++) { |
| if (pwm_voltage_table[i][0] == reg_val) { |
| return i; |
| } |
| } |
| if (i >= ARRAY_SIZE(pwm_voltage_table)) { |
| return -1; |
| } |
| return -1; |
| } |
| |
| void set_dvfs(unsigned int domain, unsigned int index) |
| { |
| int cur, to; |
| static int init_flag = 0; |
| |
| if (!init_flag) { |
| pwm_init(pwm_b); |
| init_flag = 1; |
| } |
| cur = dvfs_get_voltage(); |
| for (to = 0; to < ARRAY_SIZE(pwm_voltage_table); to++) { |
| if (pwm_voltage_table[to][1] >= cpu_dvfs_tbl[index].volt_mv) { |
| break; |
| } |
| } |
| if (to >= ARRAY_SIZE(pwm_voltage_table)) { |
| to = ARRAY_SIZE(pwm_voltage_table) - 1; |
| } |
| if (cur < 0 || cur >=ARRAY_SIZE(pwm_voltage_table)) { |
| P_PWM_PWM_B = pwm_voltage_table[to][0]; |
| _udelay(200); |
| return ; |
| } |
| while (cur != to) { |
| /* |
| * if target step is far away from current step, don't change |
| * voltage by one-step-done. You should change voltage step by |
| * step to make sure voltage output is stable |
| */ |
| if (cur < to) { |
| if (cur < to - 3) { |
| cur += 3; |
| } else { |
| cur = to; |
| } |
| } else { |
| if (cur > to + 3) { |
| cur -= 3; |
| } else { |
| cur = to; |
| } |
| } |
| P_PWM_PWM_B = pwm_voltage_table[cur][0]; |
| _udelay(100); |
| } |
| _udelay(200); |
| } |
| |
