microwatt/litedram/gen-src/sdram_init/include/system.h

static inline void flush_cpu_dcache(void) { }
static inline void flush_l2_cache(void) { }

#define CONFIG_CPU_NOP "nop"
#define CONFIG_CLOCK_FREQUENCY 100000000

static inline void timer0_en_write(int e) { }
static inline void timer0_reload_write(int r) { }
static inline void timer0_load_write(int l) { }
static inline void timer0_update_value_write(int v) { }
static inline uint64_t timer0_value_read(void)
{
	uint64_t val;

	__asm__ volatile ("mfdec %0" : "=r" (val));
	return val;
}
litedram: Add basic support for LiteX LiteDRAM This comes in two parts: - A generator script which uses LiteX to generate litedram cores along with their init files for various boards (currently Arty and Nexys-video). This comes with configs for arty and nexys_video. - A fusesoc "generator" which uses pre-generated litedram cores The generation process is manual on purpose. This include pre-generated cores for the two above boards. This is done so that one doesn't have to install LiteX to build microwatt. In addition, the generator script or wrapper vhdl tend to break when LiteX changes significantly which happens. This is still rather standalone and hasn't been plumbed into the SoC or the FPGA toplevel files yet. At this point LiteDRAM self-initializes using a built-in VexRiscv "Minimum" core obtained from LiteX and included in this commit. There is some plumbing to generate and cores that are initialized by Microwatt directly but this isn't working yet and so isn't enabled yet. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> 5 years ago			`static inline void flush_cpu_dcache(void) { }`
			`static inline void flush_l2_cache(void) { }`

litedram: Add support for Microwatt-initialized controller This adds support for initializing the memory controller from microwatt rather than using a built-in RiscV processor. This might require some fixes to LiteX and LiteDRAM (they haven't been merged as of this commit yet). This is enabled in the shipped generated files and can be changed via modifying the generator script to pass False to "mw_init" Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> 5 years ago			`#define CONFIG_CPU_NOP "nop"`
			`#define CONFIG_CLOCK_FREQUENCY 100000000`

			`static inline void timer0_en_write(int e) { }`
			`static inline void timer0_reload_write(int r) { }`
			`static inline void timer0_load_write(int l) { }`
			`static inline void timer0_update_value_write(int v) { }`
			`static inline uint64_t timer0_value_read(void)`
			`{`
			`uint64_t val;`

			`__asm__ volatile ("mfdec %0" : "=r" (val));`
			`return val;`
			`}`