lpc: Initial lpcxpresso bits

This gets the LPC11U14 clock set to the PLL and blinks the LED.

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

1 files changed, 147 insertions, 0 deletions

diff --git a/src/lpc/ao_arch_funcs.h b/src/lpc/ao_arch_funcs.h
new file mode 100644
index 00000000..39222b9d
--- /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_ */