altos/stmf0: Add CRC driver

Sets up the stm32f0 CRC hardware, exposing inline functions to access
it. DMA access is possible, but usbtrng can't use that.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/stmf0/ao_crc.h b/src/stmf0/ao_crc.h
new file mode 100644 (file)
index 0000000..cd011d3
--- /dev/null
+++ b/src/stmf0/ao_crc.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2015 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_CRC_H_
+#define _AO_CRC_H_
+
+#define AO_CRC_16_CCITT                0x1021
+#define AO_CRC_16_CDMA2000     0xc867
+#define AO_CRC_16_DECT         0x0589
+#define AO_CRC_16_T10_DIF      0x8bb7
+#define AO_CRC_16_DNP          0x3d65
+#define AO_CRC_16_ANSI         0x8005
+#define AO_CRC_16_DEFAULT      AO_CRC_16_ANSI
+
+#define AO_CRC_32_ANSI         0x04c11db7
+#define AO_CRC_32_C            0x1edc6f41
+
+#define AO_CRC_32_DEFAULT      AO_CRC_32_ANSI
+
+static inline uint16_t
+ao_crc_in_32_out_16(uint32_t v) {
+       stm_crc.dr.u32 = v;
+       return stm_crc.dr.u16;
+}
+
+static inline uint16_t
+ao_crc_in_16_out_16(uint16_t v) {
+       stm_crc.dr.u16 = v;
+       return stm_crc.dr.u16;
+}
+
+static inline uint16_t
+ao_crc_in_8_out_16(uint8_t v) {
+       stm_crc.dr.u8 = v;
+       return stm_crc.dr.u16;
+}
+
+void
+ao_crc_reset(void);
+
+void
+ao_crc_init(void);
+
+#endif /* _AO_CRC_H_ */

diff --git a/src/stmf0/stm32f0.h b/src/stmf0/stm32f0.h
index 32864ced9f63ca1e1836d00171399178c14b91a3..ce8ca456d66d2660d7e073f4e3e93db9256d8ccb 100644 (file)
--- a/src/stmf0/stm32f0.h
+++ b/src/stmf0/stm32f0.h
@@ -23,6 +23,7 @@
 typedef volatile uint32_t      vuint32_t;
 typedef volatile void *                vvoid_t;
 typedef volatile uint16_t      vuint16_t;
+typedef volatile uint8_t       vuint8_t;
 
 struct stm_gpio {
        vuint32_t       moder;
@@ -568,6 +569,37 @@ extern struct stm_pwr stm_pwr;
 #define STM_PWR_CSR_SBF                (1)
 #define STM_PWR_CSR_WUF                (0)
 
+struct stm_crc {
+       union {
+               vuint32_t       u32;
+               vuint16_t       u16;
+               vuint8_t        u8;
+       }               dr;
+       vuint32_t       idr;
+       vuint32_t       cr;
+       uint32_t        _0c;
+
+       vuint32_t       init;
+       vuint32_t       pol;
+};
+
+extern struct stm_crc  stm_crc;
+
+#define stm_crc        (*((struct stm_crc *) 0x40023000))
+
+#define STM_CRC_CR_REV_OUT     7
+#define STM_CRC_CR_REV_IN      5
+#define  STM_CRC_CR_REV_IN_NONE                0
+#define  STM_CRC_CR_REV_IN_BY_BYTE     1
+#define  STM_CRC_CR_REV_IN_BY_HALF_WORD        2
+#define  STM_CRC_CR_REV_IN_BY_WORD     3
+#define STM_CRC_CR_POLYSIZE    3
+#define  STM_CRC_CR_POLYSIZE_32                0
+#define  STM_CRC_CR_POLYSIZE_16                1
+#define  STM_CRC_CR_POLYSIZE_8         2
+#define  STM_CRC_CR_POLYSIZE_7         3
+#define STM_CRC_CR_RESET       0
+
 /* The SYSTICK starts at 0xe000e010 */
 
 struct stm_systick {