1 files changed, 0 insertions, 114 deletions
diff --git a/src/samd21/i2c.c b/src/samd21/i2c.c
deleted file mode 100644
index 801c0e32..00000000
--- a/src/samd21/i2c.c
+++ /dev/null
@@ -1,114 +0,0 @@
-// i2c support on samd21
-//
-// Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "autoconf.h" // CONFIG_CLOCK_FREQ
-#include "internal.h" // enable_pclock
-#include "command.h" // shutdown
-#include "gpio.h" // i2c_setup
-#include "samd21.h" // SERCOM3
-#include "sched.h" // sched_shutdown
-
-#define TIME_RISE 125ULL // 125 nanoseconds
-#define I2C_FREQ 100000
-
-static void
-i2c_init(void)
-{
-    static int have_run_init;
-    if (have_run_init)
-        return;
-    have_run_init = 1;
-
-    // Setup clock
-    enable_pclock(SERCOM3_GCLK_ID_CORE, PM_APBCMASK_SERCOM3);
-
-    // Configure SDA, SCL pins
-    gpio_peripheral(GPIO('A', 22), 'C', 0);
-    gpio_peripheral(GPIO('A', 23), 'C', 0);
-
-    // Configure i2c
-    SercomI2cm *si = &SERCOM3->I2CM;
-    si->CTRLA.reg = 0;
-    uint32_t areg = (SERCOM_I2CM_CTRLA_LOWTOUTEN
-                     | SERCOM_I2CM_CTRLA_INACTOUT(3)
-                     | SERCOM_I2CM_STATUS_SEXTTOUT
-                     | SERCOM_I2CM_STATUS_MEXTTOUT
-                     | SERCOM_I2CM_CTRLA_MODE_I2C_MASTER);
-    si->CTRLA.reg = areg;
-    uint32_t baud = (CONFIG_CLOCK_FREQ / I2C_FREQ
-                     - 10 - CONFIG_CLOCK_FREQ*TIME_RISE/1000000000) / 2;
-    si->BAUD.reg = baud;
-    si->CTRLA.reg = areg | SERCOM_I2CM_CTRLA_ENABLE;
-    while (si->SYNCBUSY.reg & SERCOM_I2CM_SYNCBUSY_ENABLE)
-        ;
-
-    // Go into idle mode
-    si->STATUS.reg = SERCOM_I2CM_STATUS_BUSSTATE(1);
-    while (si->SYNCBUSY.reg & SERCOM_I2CM_SYNCBUSY_SYSOP)
-        ;
-}
-
-struct i2c_config
-i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr)
-{
-    if (bus)
-        shutdown("Unsupported i2c bus");
-    i2c_init();
-    return (struct i2c_config){ .addr=addr<<1 };
-}
-
-static void
-i2c_wait(SercomI2cm *si)
-{
-    for (;;) {
-        uint32_t intflag = si->INTFLAG.reg;
-        if (!(intflag & SERCOM_I2CM_INTFLAG_MB)) {
-            if (si->STATUS.reg & SERCOM_I2CM_STATUS_BUSERR)
-                shutdown("i2c buserror");
-            continue;
-        }
-        if (intflag & SERCOM_I2CM_INTFLAG_ERROR)
-            shutdown("i2c error");
-        break;
-    }
-}
-
-static void
-i2c_start(SercomI2cm *si, uint8_t addr)
-{
-    si->ADDR.reg = addr;
-    i2c_wait(si);
-}
-
-static void
-i2c_send_byte(SercomI2cm *si, uint8_t b)
-{
-    si->DATA.reg = b;
-    i2c_wait(si);
-}
-
-static void
-i2c_stop(SercomI2cm *si)
-{
-    si->CTRLB.reg = SERCOM_I2CM_CTRLB_CMD(3);
-}
-
-void
-i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
-{
-    SercomI2cm *si = &SERCOM3->I2CM;
-    i2c_start(si, config.addr);
-    while (write_len--)
-        i2c_send_byte(si, *write++);
-    i2c_stop(si);
-}
-
-void
-i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
-         , uint8_t read_len, uint8_t *read)
-{
-    shutdown("i2c_read not supported on samd21");
-}