piolib: Add abstractions for PIO hardware sizes

Add methods to return the PIO hardware dimensions, and declare the RP1
PIO FIFO size. Also accept the pio_version field in programs.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

piolib/include/piolib.h

@@ -92,6 +92,7 @@ typedef struct pio_program {
     const uint16_t *instructions;
     uint8_t length;
     int8_t origin; // required instruction memory origin or -1
+    uint8_t pio_version;
 } pio_program_t;
 
 typedef struct {
@@ -106,6 +107,7 @@ struct pio_chip {
     const char *compatible;
     uint16_t instr_count;
     uint16_t sm_count;
+    uint16_t fifo_depth;
     void *hw_state;
 
     PIO (*create_instance)(PIO_CHIP_T *chip, uint index);
@@ -247,6 +249,21 @@ static inline void pio_enable_fatal_errors(PIO pio, bool enable)
     pio->errors_are_fatal = enable;
 }
 
+static inline uint pio_get_sm_count(PIO pio)
+{
+    return pio->chip->sm_count;
+}
+
+static inline uint pio_get_instruction_count(PIO pio)
+{
+    return pio->chip->instr_count;
+}
+
+static inline uint pio_get_fifo_depth(PIO pio)
+{
+    return pio->chip->fifo_depth;
+}
+
 static inline void check_pio_param(__unused PIO pio)
 {
     valid_params_if(PIO, pio_get_index(pio) >= 0);

piolib/pio_rp1.c

@@ -860,6 +860,7 @@ static const PIO_CHIP_T rp1_pio_chip = {
     .compatible = "raspberrypi,rp1-pio",
     .instr_count = RP1_PIO_INSTRUCTION_COUNT,
     .sm_count =  RP1_PIO_SM_COUNT,
+    .fifo_depth = 8,
 
     .create_instance = rp1_create_instance,
     .open_instance = rp1_open_instance,