/* gpios.hpp: Q/UniBone functions for Non-PRU GPIOs Copyright (c) 2018, Joerg Hoppe j_hoppe@t-online.de, www.retrocmp.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL JOERG HOPPE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 12-nov-2018 JH entered beta phase */ #ifndef _GPIOS_H_ #define _GPIOS_H_ #include #include #include #include #include "logsource.hpp" #include "bitcalc.h" /*** a LED which shines at least a certain time on activation (monoflop) ***/ #include #include class activity_led_c { private: static const unsigned led_count = 4 ; std::mutex m ; unsigned cycle_time_ms = 50 ; // polling intervall and granularity unsigned minimal_on_time_ms = 100 ; // default: 100ms ON on every pulse volatile unsigned cycles[led_count] ; // LED on if > 0. acessed in thread bool waiter_terminated = false; void waiter_func() ; std::thread waiter = std::thread(&activity_led_c::waiter_func, this) ; public: activity_led_c() ; ~activity_led_c() ; bool enabled = false ; // set concurrently to thread void set(unsigned led_idx, bool onoff) ; } ; /*** Low elvel GPIO stuff ***/ // device for a set of 32 gpio pins typedef struct { unsigned gpios_in_use; // so much pins from this bank are in use uint32_t registerrange_addr_unmapped; //unmapped start addr of GPIo register range unsigned registerrange_size; // start addr of register bank, mapped into memory volatile uint8_t *registerrange_start_addr; // address of Output Enable Register, mapped into memory. // bit = 1: pin i is output, 0 = input volatile uint32_t *oe_addr; // Address of DATAIN register. Reflects the GPIO pin voltage levels. volatile uint32_t *datain_addr; // Address of DATAOUT register. Reflects the GPIO output pin voltage levels. volatile uint32_t *dataout_addr; uint32_t cur_dataout_val; // cached value of dataout register // access to this is much faster than the GPIO dataut itself. // mapped address of "set pin" register // bit := 1: gpio pin i is set to H level volatile uint32_t *setdataout_addr; // mapped address of "clear pin" register // bit := 1: gpio pin i is set to H level volatile uint32_t *clrdataout_addr; } gpio_bank_t; /* access addresses for on gpio pin */ typedef struct { char name[80]; unsigned tag; // marker for processing int internal; // 1 = used internally, for P9.41, P).42 collision int direction; unsigned bank_idx; // GPIO=0,1,2,3 gpio_bank_t *bank; // GPIO=0,1,2,3 unsigned pin_in_bank; // 0..31 unsigned pin_in_bank_mask; // mask with bit 'gpio_pin_in_bank' set unsigned linear_no; // linear index in /sys/class/gpio= 32*bank + pin_in_bnak } gpio_config_t; // direction of a pin #define DIR_INPUT 0 #define DIR_OUTPUT 1 #define MAX_GPIOCOUNT 100 // test pins // SET(1) -> pin auf H, LED OFF #define ARM_DEBUG_PIN0(val) GPIO_SETVAL(gpios->led[0], !!(val)) #define ARM_DEBUG_PIN1(val) GPIO_SETVAL(gpios->led[1], !!(val)) #define ARM_DEBUG_PIN2(val) GPIO_SETVAL(gpios->led[2], !!(val)) #define ARM_DEBUG_PIN3(val) GPIO_SETVAL(gpios->led[3], !!(val)) #define ARM_DEBUG_PIN(n,val) GPIO_SETVAL(gpios->led[n], !!(val)) class gpios_c: public logsource_c { private: int memory_filedescriptor; void bank_map_registers(unsigned bank_idx, unsigned unmapped_start_addr); gpio_config_t *config(const char *name, int direction, unsigned bank_idx, unsigned pin_in_bank); void export_pin(gpio_config_t *pin); public: gpios_c(); // list of gpio register banks gpio_bank_t banks[4]; // list of pins pins gpio_config_t *pins[MAX_GPIOCOUNT + 1]; // mapped start addresses of register space for GPIOs volatile void *registerrange_start_addr[4]; gpio_config_t *led[4], *swtch[4], *button, *reg_enable, *bus_enable, *i2c_panel_reset, *qunibus_activity_led=NULL, *reg_addr[3], *reg_write, *reg_datin[8], *reg_datout[8], *collision_p9_41, *collision_p9_42; unsigned cmdline_leds ; // as set on call to application via cmdline options bool leds_for_debug = false ; // global LED for all drive accesses activity_led_c drive_activity_led ; // singleton void init(void); void set_frequency(unsigned frequency); void set_leds(unsigned number) ; void test_toggle(gpio_config_t *gpio); void test_loopback(void); }; extern gpios_c *gpios; // singleton // merges the bits of unshifted_val into the gpio output register // of bank[idx]. target position is given by bitpos, bitfield size by bitmask // This macro is optimized assuming that writing a memorymapped GPIO register // takes much longer than ARM internal operations. #define GPIO_OUTPUTBITS(bank,bitpos,bitmask,unshifted_val) do { \ unsigned tmp = (bank)->cur_dataout_val ; \ tmp &= ~((bitmask) << (bitpos)) ; /* erase bitfield*/ \ tmp |= ((unshifted_val) & (bitmask)) << (bitpos) ; /* copy val to bitfield*/ \ (bank)->cur_dataout_val = *((bank)->dataout_addr) = tmp ; \ } while(0) // set a value by writing a bit mask into output register #define GPIO_SETVAL(gpio,val) GPIO_OUTPUTBITS((gpio)->bank, (gpio)->pin_in_bank, 1, (val) ) // get a value by reading value register // Getval(input) reads pin. Getval(output) reads values set. #define GPIO_GETVAL(gpio) ( \ (gpio)->direction == DIR_OUTPUT ? \ (!! ( *((gpio)->bank->dataout_addr) & (gpio)->pin_in_bank_mask ) ) \ : (!! ( *((gpio)->bank->datain_addr) & (gpio)->pin_in_bank_mask ) ) \ ) #endif // _GPIOS_H_