BCM_PWM_MEM_READ
reg = BCM_PWM_MEM_READ(sc, arg2 & 0xff);
#define R_CTL(_sc) BCM_PWM_MEM_READ(_sc, 0x00)
#define R_STA(_sc) BCM_PWM_MEM_READ(_sc, 0x04)
#define R_RNG(_sc) BCM_PWM_MEM_READ(_sc, 0x10)
#define R_DAT(_sc) BCM_PWM_MEM_READ(_sc, 0x14)
#define R_RNG2(_sc) BCM_PWM_MEM_READ(_sc, 0x20)
#define R_DAT2(_sc) BCM_PWM_MEM_READ(_sc, 0x24)