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 */
53 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)read_data;  in sbi_cppc_read()  local
55 	data->ret = sbi_ecall(SBI_EXT_CPPC, SBI_CPPC_READ,  in sbi_cppc_read()
56 			      data->reg, 0, 0, 0, 0, 0);  in sbi_cppc_read()
61 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)write_data;  in sbi_cppc_write()  local
63 	data->ret = sbi_ecall(SBI_EXT_CPPC, SBI_CPPC_WRITE,  in sbi_cppc_write()
64 			      data->reg, data->val, 0, 0, 0, 0);  in sbi_cppc_write()
69 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)read_data;  in cppc_ffh_csr_read()  local
71 	switch (data->reg) {  in cppc_ffh_csr_read()
74 		data->ret.value = csr_read(CSR_TIME);  in cppc_ffh_csr_read()
75 		data->ret.error = 0;  in cppc_ffh_csr_read()
78 		data->ret.error = -EINVAL;  in cppc_ffh_csr_read()
85 	struct sbi_cppc_data *data = (struct sbi_cppc_data *)write_data;  in cppc_ffh_csr_write()  local
87 	data->ret.error = -EINVAL;  in cppc_ffh_csr_write()
101 	struct sbi_cppc_data data;  in cpc_read_ffh()  local
104 		return -EPERM;  in cpc_read_ffh()
106 	if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_SBI) {  in cpc_read_ffh()
108 			return -EINVAL;  in cpc_read_ffh()
110 		data.reg = FFH_CPPC_SBI_REG(reg->address);  in cpc_read_ffh()
112 		smp_call_function_single(cpu, sbi_cppc_read, &data, 1);  in cpc_read_ffh()
114 		*val = data.ret.value;  in cpc_read_ffh()
116 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_read_ffh()
117 	} else if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_CSR) {  in cpc_read_ffh()
118 		data.reg = FFH_CPPC_CSR_NUM(reg->address);  in cpc_read_ffh()
120 		smp_call_function_single(cpu, cppc_ffh_csr_read, &data, 1);  in cpc_read_ffh()
122 		*val = data.ret.value;  in cpc_read_ffh()
124 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_read_ffh()
127 	return -EINVAL;  in cpc_read_ffh()
132 	struct sbi_cppc_data data;  in cpc_write_ffh()  local
135 		return -EPERM;  in cpc_write_ffh()
137 	if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_SBI) {  in cpc_write_ffh()
139 			return -EINVAL;  in cpc_write_ffh()
141 		data.reg = FFH_CPPC_SBI_REG(reg->address);  in cpc_write_ffh()
142 		data.val = val;  in cpc_write_ffh()
144 		smp_call_function_single(cpu, sbi_cppc_write, &data, 1);  in cpc_write_ffh()
146 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_write_ffh()
147 	} else if (FFH_CPPC_TYPE(reg->address) == FFH_CPPC_CSR) {  in cpc_write_ffh()
148 		data.reg = FFH_CPPC_CSR_NUM(reg->address);  in cpc_write_ffh()
149 		data.val = val;  in cpc_write_ffh()
151 		smp_call_function_single(cpu, cppc_ffh_csr_write, &data, 1);  in cpc_write_ffh()
153 		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;  in cpc_write_ffh()
156 	return -EINVAL;  in cpc_write_ffh()