stm32: Move clock line mapping from stm32h7_adc.c to lookup_clock_line()

Use the common lookup_clock_line() code to lookup the adc clock lines.
This also enables resets on the adc1/adc2 hardware block.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/stm32/stm32g4.c

@@ -43,6 +43,10 @@ lookup_clock_line(uint32_t periph_base)
                               .bit = 1 << pos};
 
     } else {
+        if (periph_base == ADC12_COMMON_BASE)
+            return (struct cline){.en = &RCC->AHB2ENR,
+                                  .rst = &RCC->AHB2RSTR,
+                                  .bit = RCC_AHB2ENR_ADC12EN};
         uint32_t pos = (periph_base - AHB2PERIPH_BASE) / 0x400;
         return (struct cline){.en = &RCC->AHB2ENR,
                               .rst = &RCC->AHB2RSTR,

src/stm32/stm32h7.c

@@ -40,6 +40,9 @@ lookup_clock_line(uint32_t periph_base)
         uint32_t bit = 1 << ((periph_base - D2_AHB2PERIPH_BASE) / 0x400);
         return (struct cline){.en=&RCC->AHB2ENR, .rst=&RCC->AHB2RSTR, .bit=bit};
     } else if (periph_base >= D2_AHB1PERIPH_BASE) {
+        if (periph_base == ADC12_COMMON_BASE)
+            return (struct cline){.en = &RCC->AHB1ENR, .rst = &RCC->AHB1RSTR,
+                                  .bit = RCC_AHB1ENR_ADC12EN};
         uint32_t bit = 1 << ((periph_base - D2_AHB1PERIPH_BASE) / 0x400);
         return (struct cline){.en=&RCC->AHB1ENR, .rst=&RCC->AHB1RSTR, .bit=bit};
     } else if (periph_base >= D2_APB2PERIPH_BASE) {

src/stm32/stm32h7_adc.c

@@ -1,34 +1,27 @@
-// ADC functions on STM32H7
+// Analog to digital (ADC) on stm32h7 and similar chips
 //
 // Copyright (C) 2020 Konstantin Vogel <konstantin.vogel@gmx.net>
+// Copyright (C) 2022  Kevin O'Connor <kevin@koconnor.net>
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
 #include "board/irq.h" // irq_save
 #include "board/misc.h" // timer_from_us
 #include "command.h" // shutdown
-#include "compiler.h" // ARRAY_SIZE
-#include "generic/armcm_timer.h" // udelay
 #include "gpio.h" // gpio_adc_setup
 #include "internal.h" // GPIO
 #include "sched.h" // sched_shutdown
 
 #if CONFIG_MACH_STM32H7
-  #define RCC_AHBENR_ADC                      (RCC->AHB1ENR)
-  #define RCC_AHBENR_ADCEN                    (RCC_AHB1ENR_ADC12EN)
   #define ADC_CKMODE                          (0b11)
   #define ADC_ATICKS                          (0b101)
   #if CONFIG_MACH_STM32H723
     #define PCSEL                               PCSEL_RES0
   #endif
 #elif CONFIG_MACH_STM32L4
-  #define RCC_AHBENR_ADC                      (RCC->AHB2ENR)
-  #define RCC_AHBENR_ADCEN                    (RCC_AHB2ENR_ADCEN)
   #define ADC_CKMODE                          (0)
   #define ADC_ATICKS                          (0b100)
 #elif CONFIG_MACH_STM32G4
-  #define RCC_AHBENR_ADC                      (RCC->AHB2ENR)
-  #define RCC_AHBENR_ADCEN                    (RCC_AHB2ENR_ADC12EN)
   #define ADC_CKMODE                          (0b11)
   #define ADC_ATICKS                          (0b100)
   #define ADC_CCR_TSEN                        (ADC_CCR_VSENSESEL)
@@ -198,28 +191,25 @@ gpio_adc_setup(uint32_t pin)
     ADC_TypeDef *adc;
     ADC_Common_TypeDef *adc_common;
 #ifdef ADC3
-    if (chan >= 2 * ADCIN_BANK_SIZE){
+    if (chan >= 2 * ADCIN_BANK_SIZE) {
         chan -= 2 * ADCIN_BANK_SIZE;
         adc = ADC3;
         adc_common = ADC3_COMMON;
-        if (!is_enabled_pclock(ADC3_BASE)) {
-            enable_pclock(ADC3_BASE);
-        }
     } else
 #endif
 #ifdef ADC2
-    if (chan >= ADCIN_BANK_SIZE){
+    if (chan >= ADCIN_BANK_SIZE) {
         chan -= ADCIN_BANK_SIZE;
         adc = ADC2;
         adc_common = ADC12_COMMON;
-        RCC_AHBENR_ADC |= RCC_AHBENR_ADCEN;
     } else
 #endif
     {
         adc = ADC1;
         adc_common = ADC12_COMMON;
-        RCC_AHBENR_ADC |= RCC_AHBENR_ADCEN;
     }
+    if (!is_enabled_pclock((uint32_t)adc_common))
+        enable_pclock((uint32_t)adc_common);
     MODIFY_REG(adc_common->CCR, ADC_CCR_CKMODE_Msk,
                ADC_CKMODE << ADC_CCR_CKMODE_Pos);
 

src/stm32/stm32l4.c

@@ -42,7 +42,7 @@ lookup_clock_line(uint32_t periph_base)
                               .rst = &RCC->AHB1RSTR,
                               .bit = 1 << pos};
 
-    } else if (periph_base == ADC1_BASE) {
+    } else if (periph_base == ADC12_COMMON_BASE) {
         return (struct cline){.en = &RCC->AHB2ENR,
                               .rst = &RCC->AHB2RSTR,
                               .bit = RCC_AHB2ENR_ADCEN};