[LinuxBIOS] patch: add cache as ram auto for digital logic msm800sev

[Stefan Reinauer]

* ron minnich <rminnich at gmail.com> [070505 00:53]:
> This patch as a cache_as_ram_auto.c for the msm800sev.
> 
> Signed-off-by: Ronald G. Minnich <rminnich at gmail.com>
Acked-by: Stefan Reinauer <stepan at coresystems.de>

> Index: src/mainboard/digitallogic/msm800sev/cache_as_ram_auto.c
> ===================================================================
> --- src/mainboard/digitallogic/msm800sev/cache_as_ram_auto.c	(revision 0)
> +++ src/mainboard/digitallogic/msm800sev/cache_as_ram_auto.c	(revision 0)
> @@ -0,0 +1,118 @@
> +#define ASSEMBLY 1
> +
> +#include <stdint.h>
> +#include <device/pci_def.h>
> +#include <arch/io.h>
> +#include <device/pnp_def.h>
> +#include <arch/romcc_io.h>
> +#include <arch/hlt.h>
> +#include "pc80/serial.c"
> +#include "arch/i386/lib/console.c"
> +#include "ram/ramtest.c"
> +#include "cpu/x86/bist.h"
> +#include "cpu/x86/msr.h"
> +#include <cpu/amd/lxdef.h>
> +#include <cpu/amd/geode_post_code.h>
> +#include "southbridge/amd/cs5536/cs5536.h"
> +
> +#define POST_CODE(x) outb(x, 0x80)
> +#define SERIAL_DEV PNP_DEV(0x2e, W83627HF_SP1)
> +
> +#include "southbridge/amd/cs5536/cs5536_early_smbus.c"
> +#include "southbridge/amd/cs5536/cs5536_early_setup.c"
> +#include "superio/winbond/w83627hf/w83627hf_early_serial.c"
> +
> +static inline int spd_read_byte(unsigned device, unsigned address)
> +{
> +		return smbus_read_byte(device, address);
> +}
> +
> +#define ManualConf 0		/* Do automatic strapped PLL config */
> +#define PLLMSRhi 0x00001490 /* manual settings for the PLL */
> +#define PLLMSRlo 0x02000030
> +#define DIMM0 0xA0
> +#define DIMM1 0xA2
> +#include "northbridge/amd/lx/raminit.h"
> +#include "northbridge/amd/lx/pll_reset.c"
> +#include "northbridge/amd/lx/raminit.c"
> +#include "sdram/generic_sdram.c"
> +#include "cpu/amd/model_lx/cpureginit.c"
> +#include "cpu/amd/model_lx/syspreinit.c"
> +
> +static void msr_init(void)
> +{
> +	msr_t msr;
> +	/* Setup access to the MC for under 1MB. Note MC not setup yet. */
> +	msr.hi = 0x24fffc02;
> +	msr.lo =  0x10010000;
> +	wrmsr(CPU_RCONF_DEFAULT, msr);
> +
> +	msr.hi = 0x20000000;
> +	msr.lo = 0xfff00;
> +	wrmsr(MSR_GLIU0 + 0x20, msr);
> +
> +	msr.hi = 0x20000000;
> +	msr.lo =  0xfff00;
> +	wrmsr(MSR_GLIU1 + 0x20, msr);
> +
> +}
> +
> +static void mb_gpio_init(void)
> +{
> +	/* Early mainboard specific GPIO setup */
> +}
> +
> +void cache_as_ram_main(void)
> +{
> +	extern void RestartCAR();
> +	POST_CODE(0x01);
> +
> +	static const struct mem_controller memctrl [] = {
> +		{.channel0 = {(0xa<<3)|0, (0xa<<3)|1}}
> +	};
> +
> +	SystemPreInit();
> +	msr_init();
> +
> +	cs5536_early_setup();
> +
> +	/* NOTE: must do this AFTER the early_setup!
> +	 * it is counting on some early MSR setup
> +	 * for cs5536
> +	 */
> +	cs5536_disable_internal_uart();
> +	w83627hf_enable_serial(SERIAL_DEV, TTYS0_BASE);
> +	mb_gpio_init();
> +	uart_init();
> +	console_init();
> +
> +	pll_reset(ManualConf);
> +
> +	cpuRegInit();
> +
> +	sdram_initialize(1, memctrl);
> +
> +	/* Check all of memory */
> +	ram_check(0x00000000, 640*1024);
> +
> +	/* Switch from Cache as RAM to real RAM */
> +	/* There are two ways we could think about this.
> +	 1. If we are using the auto.inc ROMCC way, the stack is going to be re-setup in the code following this code.
> +		Just wbinvd the stack to clear the cache tags. We don't care where the stack used to be.
> +	 2. This file is built as a normal .c -> .o and linked in etc. The stack might be used to return etc.
> +		That means we care about what is in the stack. If we are smart we set the CAR stack to the same location
> +		as the rest of LinuxBIOS. If that is the case we can just do a wbinvd. The stack will be written into real
> +		RAM that is now setup and we continue like nothing happened. If the stack is located somewhere other than
> +		where LB would like it, you need to write some code to do a copy from cache to RAM
> +
> +	 We use method 1 on Norwich.
> +	*/
> +	POST_CODE(0x02);
> +	print_err("POST 02\n");
> +	__asm__("wbinvd\n");
> +	print_err("Past wbinvd\n");
> +	/* we are finding the return does not work on this board. Explicitly call the label that is 
> +	 * after the call to us. This is gross, but sometimes at this level it is the only way out
> +	 */
> +	done_cache_as_ram_main();
> +}

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