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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <[email protected]>
*/
#include <libfdt.h>
#include <sbi/sbi_error.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/regmap/fdt_regmap.h>
/* List of FDT regmap drivers generated at compile time */
extern struct fdt_regmap *fdt_regmap_drivers[];
extern unsigned long fdt_regmap_drivers_size;
static int fdt_regmap_init(void *fdt, int nodeoff, u32 phandle)
{
int pos, rc;
struct fdt_regmap *drv;
const struct fdt_match *match;
/* Try all I2C drivers one-by-one */
for (pos = 0; pos < fdt_regmap_drivers_size; pos++) {
drv = fdt_regmap_drivers[pos];
match = fdt_match_node(fdt, nodeoff, drv->match_table);
if (match && drv->init) {
rc = drv->init(fdt, nodeoff, phandle, match);
if (rc == SBI_ENODEV)
continue;
if (rc)
return rc;
return 0;
}
}
return SBI_ENOSYS;
}
static int fdt_regmap_find(void *fdt, int nodeoff, u32 phandle,
struct regmap **out_rmap)
{
int rc;
struct regmap *rmap = regmap_find(phandle);
if (!rmap) {
/* Regmap not found so initialize matching driver */
rc = fdt_regmap_init(fdt, nodeoff, phandle);
if (rc)
return rc;
/* Try to find regmap again */
rmap = regmap_find(phandle);
if (!rmap)
return SBI_ENOSYS;
}
if (out_rmap)
*out_rmap = rmap;
return 0;
}
int fdt_regmap_get_by_phandle(void *fdt, u32 phandle,
struct regmap **out_rmap)
{
int pnodeoff;
if (!fdt || !out_rmap)
return SBI_EINVAL;
pnodeoff = fdt_node_offset_by_phandle(fdt, phandle);
if (pnodeoff < 0)
return pnodeoff;
return fdt_regmap_find(fdt, pnodeoff, phandle, out_rmap);
}
int fdt_regmap_get(void *fdt, int nodeoff, struct regmap **out_rmap)
{
int len;
const fdt32_t *val;
if (!fdt || (nodeoff < 0) || !out_rmap)
return SBI_EINVAL;
val = fdt_getprop(fdt, nodeoff, "regmap", &len);
if (!val)
return SBI_ENOENT;
return fdt_regmap_get_by_phandle(fdt, fdt32_to_cpu(*val), out_rmap);
}
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