1 // SPDX-License-Identifier: GPL-2.0-only
3  * Implement CPPC FFH helper routines for RISC-V.
20 /* RISC-V FFH definitions from RISC-V FFH spec */
51 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)read_data;  in sbi_cppc_read()  local
53 	data->ret = sbi_ecall(SBI_EXT_CPPC, SBI_CPPC_READ,  in sbi_cppc_read()
54 			      data->reg, 0, 0, 0, 0, 0);  in sbi_cppc_read()
59 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)write_data;  in sbi_cppc_write()  local
61 	data->ret = sbi_ecall(SBI_EXT_CPPC, SBI_CPPC_WRITE,  in sbi_cppc_write()
62 			      data->reg, data->val, 0, 0, 0, 0);  in sbi_cppc_write()
67 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)read_data;  in cppc_ffh_csr_read()  local
69 	switch (data->reg) {  in cppc_ffh_csr_read()
72 		data->ret.value = csr_read(CSR_TIME);  in cppc_ffh_csr_read()
73 		data->ret.error = 0;  in cppc_ffh_csr_read()
76 		data->ret.error = -EINVAL;  in cppc_ffh_csr_read()
83 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)write_data;  in cppc_ffh_csr_write()  local
85 	data->ret.error = -EINVAL;  in cppc_ffh_csr_write()
99 	struct sbi_cppc_data data;  in cpc_read_ffh()  local
102 		return -EPERM;  in cpc_read_ffh()
104 	if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_SBI) {  in cpc_read_ffh()
106 			return -EINVAL;  in cpc_read_ffh()
108 		data.reg = FFH_CPPC_SBI_REG(reg->address);  in cpc_read_ffh()
110 		smp_call_function_single(cpu, sbi_cppc_read, &data, 1);  in cpc_read_ffh()
112 		*val = data.ret.value;  in cpc_read_ffh()
114 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_read_ffh()
115 	} else if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_CSR) {  in cpc_read_ffh()
116 		data.reg = FFH_CPPC_CSR_NUM(reg->address);  in cpc_read_ffh()
118 		smp_call_function_single(cpu, cppc_ffh_csr_read, &data, 1);  in cpc_read_ffh()
120 		*val = data.ret.value;  in cpc_read_ffh()
122 		return data.ret.error;  in cpc_read_ffh()
125 	return -EINVAL;  in cpc_read_ffh()
130 	struct sbi_cppc_data data;  in cpc_write_ffh()  local
133 		return -EPERM;  in cpc_write_ffh()
135 	if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_SBI) {  in cpc_write_ffh()
137 			return -EINVAL;  in cpc_write_ffh()
139 		data.reg = FFH_CPPC_SBI_REG(reg->address);  in cpc_write_ffh()
140 		data.val = val;  in cpc_write_ffh()
142 		smp_call_function_single(cpu, sbi_cppc_write, &data, 1);  in cpc_write_ffh()
144 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_write_ffh()
145 	} else if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_CSR) {  in cpc_write_ffh()
146 		data.reg = FFH_CPPC_CSR_NUM(reg->address);  in cpc_write_ffh()
147 		data.val = val;  in cpc_write_ffh()
149 		smp_call_function_single(cpu, cppc_ffh_csr_write, &data, 1);  in cpc_write_ffh()
151 		return data.ret.error;  in cpc_write_ffh()
154 	return -EINVAL;  in cpc_write_ffh()