xref: /kernel/linux/linux-6.6/arch/mips/fw/cfe/cfe_api.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2000, 2001, 2002 Broadcom Corporation
 */

/*
 *
 * Broadcom Common Firmware Environment (CFE)
 *
 * This module contains device function stubs (small routines to
 * call the standard "iocb" interface entry point to CFE).
 * There should be one routine here per iocb function call.
 *
 * Authors:  Mitch Lichtenberg, Chris Demetriou
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/printk.h>
#include <asm/mipsregs.h>
#include <asm/fw/cfe/cfe_api.h>
#include "cfe_api_int.h"

unsigned long __initdata cfe_seal;

/* Cast from a native pointer to a cfe_xptr_t and back.	 */
#define XPTR_FROM_NATIVE(n)	((cfe_xptr_t) (intptr_t) (n))
#define NATIVE_FROM_XPTR(x)	((void *) (intptr_t) (x))

int cfe_iocb_dispatch(struct cfe_xiocb *xiocb);

/*
 * Declare the dispatch function with args of "intptr_t".
 * This makes sure whatever model we're compiling in
 * puts the pointers in a single register.  For example,
 * combining -mlong64 and -mips1 or -mips2 would lead to
 * trouble, since the handle and IOCB pointer will be
 * passed in two registers each, and CFE expects one.
 */

static int (*cfe_dispfunc) (intptr_t handle, intptr_t xiocb);
static u64 cfe_handle;

int cfe_init(u64 handle, u64 ept)
{
	cfe_dispfunc = NATIVE_FROM_XPTR(ept);
	cfe_handle = handle;
	return 0;
}

int cfe_iocb_dispatch(struct cfe_xiocb * xiocb)
{
	if (!cfe_dispfunc)
		return -1;
	return (*cfe_dispfunc) ((intptr_t) cfe_handle, (intptr_t) xiocb);
}

int cfe_close(int handle)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_CLOSE;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = handle;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = 0;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;

}

int cfe_cpu_start(int cpu, void (*fn) (void), long sp, long gp, long a1)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_CPUCTL;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_cpuctl);
	xiocb.plist.xiocb_cpuctl.cpu_number = cpu;
	xiocb.plist.xiocb_cpuctl.cpu_command = CFE_CPU_CMD_START;
	xiocb.plist.xiocb_cpuctl.gp_val = gp;
	xiocb.plist.xiocb_cpuctl.sp_val = sp;
	xiocb.plist.xiocb_cpuctl.a1_val = a1;
	xiocb.plist.xiocb_cpuctl.start_addr = (long) fn;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_cpu_stop(int cpu)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_CPUCTL;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_cpuctl);
	xiocb.plist.xiocb_cpuctl.cpu_number = cpu;
	xiocb.plist.xiocb_cpuctl.cpu_command = CFE_CPU_CMD_STOP;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_enumenv(int idx, char *name, int namelen, char *val, int vallen)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_ENV_SET;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_envbuf);
	xiocb.plist.xiocb_envbuf.enum_idx = idx;
	xiocb.plist.xiocb_envbuf.name_ptr = XPTR_FROM_NATIVE(name);
	xiocb.plist.xiocb_envbuf.name_length = namelen;
	xiocb.plist.xiocb_envbuf.val_ptr = XPTR_FROM_NATIVE(val);
	xiocb.plist.xiocb_envbuf.val_length = vallen;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int
cfe_enummem(int idx, int flags, u64 *start, u64 *length, u64 *type)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_MEMENUM;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = flags;
	xiocb.xiocb_psize = sizeof(struct xiocb_meminfo);
	xiocb.plist.xiocb_meminfo.mi_idx = idx;

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;

	*start = xiocb.plist.xiocb_meminfo.mi_addr;
	*length = xiocb.plist.xiocb_meminfo.mi_size;
	*type = xiocb.plist.xiocb_meminfo.mi_type;

	return 0;
}

int cfe_exit(int warm, int status)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_RESTART;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = warm ? CFE_FLG_WARMSTART : 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_exitstat);
	xiocb.plist.xiocb_exitstat.status = status;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_flushcache(int flg)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_FLUSHCACHE;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = flg;
	xiocb.xiocb_psize = 0;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_getdevinfo(char *name)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_GETINFO;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_buffer);
	xiocb.plist.xiocb_buffer.buf_offset = 0;
	xiocb.plist.xiocb_buffer.buf_ptr = XPTR_FROM_NATIVE(name);
	xiocb.plist.xiocb_buffer.buf_length = strlen(name);

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.plist.xiocb_buffer.buf_ioctlcmd;
}

int cfe_getenv(char *name, char *dest, int destlen)
{
	struct cfe_xiocb xiocb;

	*dest = 0;

	xiocb.xiocb_fcode = CFE_CMD_ENV_GET;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_envbuf);
	xiocb.plist.xiocb_envbuf.enum_idx = 0;
	xiocb.plist.xiocb_envbuf.name_ptr = XPTR_FROM_NATIVE(name);
	xiocb.plist.xiocb_envbuf.name_length = strlen(name);
	xiocb.plist.xiocb_envbuf.val_ptr = XPTR_FROM_NATIVE(dest);
	xiocb.plist.xiocb_envbuf.val_length = destlen;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_getfwinfo(cfe_fwinfo_t * info)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_GETINFO;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_fwinfo);

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;

	info->fwi_version = xiocb.plist.xiocb_fwinfo.fwi_version;
	info->fwi_totalmem = xiocb.plist.xiocb_fwinfo.fwi_totalmem;
	info->fwi_flags = xiocb.plist.xiocb_fwinfo.fwi_flags;
	info->fwi_boardid = xiocb.plist.xiocb_fwinfo.fwi_boardid;
	info->fwi_bootarea_va = xiocb.plist.xiocb_fwinfo.fwi_bootarea_va;
	info->fwi_bootarea_pa = xiocb.plist.xiocb_fwinfo.fwi_bootarea_pa;
	info->fwi_bootarea_size =
	    xiocb.plist.xiocb_fwinfo.fwi_bootarea_size;

	return 0;
}

int cfe_getstdhandle(int flg)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_GETHANDLE;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = flg;
	xiocb.xiocb_psize = 0;

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.xiocb_handle;
}

int64_t
cfe_getticks(void)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_FW_GETTIME;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_time);
	xiocb.plist.xiocb_time.ticks = 0;

	cfe_iocb_dispatch(&xiocb);

	return xiocb.plist.xiocb_time.ticks;

}

int cfe_inpstat(int handle)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_INPSTAT;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = handle;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_inpstat);
	xiocb.plist.xiocb_inpstat.inp_status = 0;

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.plist.xiocb_inpstat.inp_status;
}

int
cfe_ioctl(int handle, unsigned int ioctlnum, unsigned char *buffer,
	  int length, int *retlen, u64 offset)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_IOCTL;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = handle;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_buffer);
	xiocb.plist.xiocb_buffer.buf_offset = offset;
	xiocb.plist.xiocb_buffer.buf_ioctlcmd = ioctlnum;
	xiocb.plist.xiocb_buffer.buf_ptr = XPTR_FROM_NATIVE(buffer);
	xiocb.plist.xiocb_buffer.buf_length = length;

	cfe_iocb_dispatch(&xiocb);

	if (retlen)
		*retlen = xiocb.plist.xiocb_buffer.buf_retlen;
	return xiocb.xiocb_status;
}

int cfe_open(char *name)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_OPEN;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_buffer);
	xiocb.plist.xiocb_buffer.buf_offset = 0;
	xiocb.plist.xiocb_buffer.buf_ptr = XPTR_FROM_NATIVE(name);
	xiocb.plist.xiocb_buffer.buf_length = strlen(name);

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.xiocb_handle;
}

int cfe_read(int handle, unsigned char *buffer, int length)
{
	return cfe_readblk(handle, 0, buffer, length);
}

int cfe_readblk(int handle, s64 offset, unsigned char *buffer, int length)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_READ;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = handle;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_buffer);
	xiocb.plist.xiocb_buffer.buf_offset = offset;
	xiocb.plist.xiocb_buffer.buf_ptr = XPTR_FROM_NATIVE(buffer);
	xiocb.plist.xiocb_buffer.buf_length = length;

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.plist.xiocb_buffer.buf_retlen;
}

int cfe_setenv(char *name, char *val)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_ENV_SET;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = 0;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_envbuf);
	xiocb.plist.xiocb_envbuf.enum_idx = 0;
	xiocb.plist.xiocb_envbuf.name_ptr = XPTR_FROM_NATIVE(name);
	xiocb.plist.xiocb_envbuf.name_length = strlen(name);
	xiocb.plist.xiocb_envbuf.val_ptr = XPTR_FROM_NATIVE(val);
	xiocb.plist.xiocb_envbuf.val_length = strlen(val);

	cfe_iocb_dispatch(&xiocb);

	return xiocb.xiocb_status;
}

int cfe_write(int handle, const char *buffer, int length)
{
	return cfe_writeblk(handle, 0, buffer, length);
}

int cfe_writeblk(int handle, s64 offset, const char *buffer, int length)
{
	struct cfe_xiocb xiocb;

	xiocb.xiocb_fcode = CFE_CMD_DEV_WRITE;
	xiocb.xiocb_status = 0;
	xiocb.xiocb_handle = handle;
	xiocb.xiocb_flags = 0;
	xiocb.xiocb_psize = sizeof(struct xiocb_buffer);
	xiocb.plist.xiocb_buffer.buf_offset = offset;
	xiocb.plist.xiocb_buffer.buf_ptr = XPTR_FROM_NATIVE(buffer);
	xiocb.plist.xiocb_buffer.buf_length = length;

	cfe_iocb_dispatch(&xiocb);

	if (xiocb.xiocb_status < 0)
		return xiocb.xiocb_status;
	return xiocb.plist.xiocb_buffer.buf_retlen;
}

void __init cfe_die(char *fmt, ...)
{
	unsigned int prid, __maybe_unused rev;
	char msg[128];
	va_list ap;
	int handle;
	unsigned int count;

	va_start(ap, fmt);
	vsprintf(msg, fmt, ap);
	strcat(msg, "\r\n");

	if (cfe_seal != CFE_EPTSEAL)
		goto no_cfe;

	prid = read_c0_prid();
	if ((prid & PRID_COMP_MASK) != PRID_COMP_BROADCOM)
		goto no_cfe;

	rev = prid & PRID_REV_MASK;

	/* disable XKS01 so that CFE can access the registers */
	switch (prid & PRID_IMP_MASK) {
#ifdef CONFIG_CPU_BMIPS4380
	case PRID_IMP_BMIPS43XX:
		if (rev >= PRID_REV_BMIPS4380_LO &&
		    rev <= PRID_REV_BMIPS4380_HI)
			__write_32bit_c0_register($22, 3,
				__read_32bit_c0_register($22, 3) & ~BIT(12));
		break;
#endif
#ifdef CONFIG_CPU_BMIPS5000
	case PRID_IMP_BMIPS5000:
	case PRID_IMP_BMIPS5200:
		__write_32bit_c0_register($22, 5,
			__read_32bit_c0_register($22, 5) & ~BIT(8));
		break;
#endif
	default:
		break;
	}

	handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
	if (handle < 0)
		goto no_cfe;

	cfe_write(handle, msg, strlen(msg));

	for (count = 0; count < 0x7fffffff; count++)
		mb();
	cfe_exit(0, 1);
	while (1)
		;

no_cfe:
	/* probably won't print anywhere useful */
	panic("%s", msg);

	va_end(ap);
}