diff --git a/include/sbi_utils/regmap/fdt_regmap.h b/include/sbi_utils/regmap/fdt_regmap.h new file mode 100644 index 00000000..0672162c --- /dev/null +++ b/include/sbi_utils/regmap/fdt_regmap.h @@ -0,0 +1,31 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2023 Ventana Micro Systems Inc. + * + * Authors: + * Anup Patel + */ + +#ifndef __FDT_REGMAP_H__ +#define __FDT_REGMAP_H__ + +#include + +struct fdt_phandle_args; + +/** FDT based regmap driver */ +struct fdt_regmap { + const struct fdt_match *match_table; + int (*init)(void *fdt, int nodeoff, u32 phandle, + const struct fdt_match *match); +}; + +/** Get regmap instance based on phandle */ +int fdt_regmap_get_by_phandle(void *fdt, u32 phandle, + struct regmap **out_rmap); + +/** Get regmap instance based on "regmap' property of the specified DT node */ +int fdt_regmap_get(void *fdt, int nodeoff, struct regmap **out_rmap); + +#endif diff --git a/lib/utils/regmap/Kconfig b/lib/utils/regmap/Kconfig index 8db5c8b8..b1ff501b 100644 --- a/lib/utils/regmap/Kconfig +++ b/lib/utils/regmap/Kconfig @@ -2,6 +2,12 @@ menu "Regmap Support" +config FDT_REGMAP + bool "FDT based regmap drivers" + depends on FDT + select REGMAP + default n + config REGMAP bool "Regmap support" default n diff --git a/lib/utils/regmap/fdt_regmap.c b/lib/utils/regmap/fdt_regmap.c new file mode 100644 index 00000000..fffac1de --- /dev/null +++ b/lib/utils/regmap/fdt_regmap.c @@ -0,0 +1,94 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2023 Ventana Micro Systems Inc. + * + * Authors: + * Anup Patel + */ + +#include +#include +#include +#include + +/* 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); +} diff --git a/lib/utils/regmap/fdt_regmap_drivers.carray b/lib/utils/regmap/fdt_regmap_drivers.carray new file mode 100644 index 00000000..c2f1c9d0 --- /dev/null +++ b/lib/utils/regmap/fdt_regmap_drivers.carray @@ -0,0 +1,3 @@ +HEADER: sbi_utils/regmap/fdt_regmap.h +TYPE: struct fdt_regmap +NAME: fdt_regmap_drivers diff --git a/lib/utils/regmap/objects.mk b/lib/utils/regmap/objects.mk index 5d1bead0..5ce2373e 100644 --- a/lib/utils/regmap/objects.mk +++ b/lib/utils/regmap/objects.mk @@ -7,4 +7,7 @@ # Anup Patel # +libsbiutils-objs-$(CONFIG_FDT_REGMAP) += regmap/fdt_regmap.o +libsbiutils-objs-$(CONFIG_FDT_REGMAP) += regmap/fdt_regmap_drivers.o + libsbiutils-objs-$(CONFIG_REGMAP) += regmap/regmap.o diff --git a/platform/generic/configs/defconfig b/platform/generic/configs/defconfig index d8793ea5..ad585e34 100644 --- a/platform/generic/configs/defconfig +++ b/platform/generic/configs/defconfig @@ -18,7 +18,7 @@ CONFIG_FDT_IRQCHIP=y CONFIG_FDT_IRQCHIP_APLIC=y CONFIG_FDT_IRQCHIP_IMSIC=y CONFIG_FDT_IRQCHIP_PLIC=y -CONFIG_REGMAP=y +CONFIG_FDT_REGMAP=y CONFIG_FDT_RESET=y CONFIG_FDT_RESET_ATCWDT200=y CONFIG_FDT_RESET_GPIO=y