lpc: Initial lpcxpresso bits

[fw/altos] / src / lpc / ao_arch_funcs.h

diff --git a/src/lpc/ao_arch_funcs.h b/src/lpc/ao_arch_funcs.h
new file mode 100644 (file)
index 0000000..39222b9
--- /dev/null
+++ b/src/lpc/ao_arch_funcs.h
@@ -0,0 +1,147 @@
+/*
+ * Copyright © 2013 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_ARCH_FUNCS_H_
+#define _AO_ARCH_FUNCS_H_
+
+#define ao_spi_get_bit(reg,bit,pin,bus,speed) ao_spi_get_mask(reg,(1<<bit),bus,speed)
+#define ao_spi_put_bit(reg,bit,pin,bus) ao_spi_put_mask(reg,(1<<bit),bus)
+
+#define ao_enable_port(port) (lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_GPIO))
+
+#define lpc_all_bit(port,bit)  (((port) << 5) | (bit))
+
+#define ao_gpio_set(port, bit, pin, v) (lpc_gpio.byte[lpc_all_bit(port,bit)] = v)
+
+#define ao_gpio_get(port, bit, pin)    (lpc_gpio_byte[lpc_all_bit(port,bit)])
+
+#define ao_enable_output(port,bit,pin,v) do {                  \
+               ao_enable_port(port);                           \
+               ao_gpio_set(port, bit, pin, v);                 \
+               lpc_gpio.dir[port] |= (1 << bit);               \
+       } while (0)
+
+#define ao_enable_input(port,bit,mode) do {                            \
+               ao_enable_port(port);                                   \
+               lpc_gpio.dir[port] &= ~(1 << bit);                      \
+               if (mode == AO_EXTI_MODE_PULL_UP)                       \
+                       stm_pupdr_set(port, bit, STM_PUPDR_PULL_UP);    \
+               else if (mode == AO_EXTI_MODE_PULL_DOWN)                \
+                       stm_pupdr_set(port, bit, STM_PUPDR_PULL_DOWN);  \
+               else                                                    \
+                       stm_pupdr_set(port, bit, STM_PUPDR_NONE);       \
+       } while (0)
+
+#define ARM_PUSH32(stack, val) (*(--(stack)) = (val))
+
+static inline uint32_t
+ao_arch_irqsave(void) {
+       uint32_t        primask;
+       asm("mrs %0,primask" : "=&r" (primask));
+       ao_arch_block_interrupts();
+       return primask;
+}
+
+static inline void
+ao_arch_irqrestore(uint32_t primask) {
+       asm("msr primask,%0" : : "r" (primask));
+}
+
+static inline void
+ao_arch_memory_barrier() {
+       asm volatile("" ::: "memory");
+}
+
+static inline void
+ao_arch_init_stack(struct ao_task *task, void *start)
+{
+       uint32_t        *sp = (uint32_t *) (task->stack + AO_STACK_SIZE);
+       uint32_t        a = (uint32_t) start;
+       int             i;
+
+       /* Return address (goes into LR) */
+       ARM_PUSH32(sp, a);
+
+       /* Clear register values r0-r7 */
+       i = 8;
+       while (i--)
+               ARM_PUSH32(sp, 0);
+
+       /* APSR */
+       ARM_PUSH32(sp, 0);
+
+       /* PRIMASK with interrupts enabled */
+       ARM_PUSH32(sp, 0);
+
+       task->sp = sp;
+}
+
+static inline void ao_arch_save_regs(void) {
+       /* Save general registers */
+       asm("push {r0-r7,lr}\n");
+
+       /* Save APSR */
+       asm("mrs r0,apsr");
+       asm("push {r0}");
+
+       /* Save PRIMASK */
+       asm("mrs r0,primask");
+       asm("push {r0}");
+}
+
+static inline void ao_arch_save_stack(void) {
+       uint32_t        *sp;
+       asm("mov %0,sp" : "=&r" (sp) );
+       ao_cur_task->sp = (sp);
+       if ((uint8_t *) sp < &ao_cur_task->stack[0])
+               ao_panic (AO_PANIC_STACK);
+}
+
+static inline void ao_arch_restore_stack(void) {
+       uint32_t        sp;
+       sp = (uint32_t) ao_cur_task->sp;
+
+       /* Switch stacks */
+       asm("mov sp, %0" : : "r" (sp) );
+
+       /* Restore PRIMASK */
+       asm("pop {r0}");
+       asm("msr primask,r0");
+
+       /* Restore APSR */
+       asm("pop {r0}");
+       asm("msr apsr,r0");
+
+       /* Restore general registers and return */
+       asm("pop {r0-r7,pc}\n");
+}
+
+#define ao_arch_isr_stack()
+
+#define ao_arch_wait_interrupt() do {                  \
+               asm(".global ao_idle_loc\n\twfi\nao_idle_loc:");        \
+               ao_arch_release_interrupts();                           \
+               ao_arch_block_interrupts();                             \
+       } while (0)
+
+#define ao_arch_critical(b) do {                               \
+               ao_arch_block_interrupts();                     \
+               do { b } while (0);                             \
+               ao_arch_release_interrupts();                   \
+       } while (0)
+
+#endif /* _AO_ARCH_FUNCS_H_ */