1 // SPDX-License-Identifier: GPL-2.0+
7 #include <dt-bindings/firmware/imx/rsrc.h>
8 #include <linux/arm-smccc.h>
9 #include <linux/clk-provider.h>
13 #include "clk-scu.h"
21  * struct clk_scu - Description of one SCU clock
23  * @rsrc_id: resource ID of this SCU clock
33  * struct imx_sc_msg_req_set_clock_rate - clock set rate protocol
34  * @hdr: SCU protocol header
39  * This structure describes the SCU protocol of clock rate set
58  * struct imx_sc_msg_get_clock_rate - clock get rate protocol
59  * @hdr: SCU protocol header
63  * This structure describes the SCU protocol of clock rate get
74  * struct imx_sc_msg_get_clock_parent - clock get parent protocol
75  * @hdr: SCU protocol header
79  * This structure describes the SCU protocol of clock get parent
95  * struct imx_sc_msg_set_clock_parent - clock set parent protocol
96  * @hdr: SCU protocol header
99  * This structure describes the SCU protocol of clock set parent
109  * struct imx_sc_msg_req_clock_enable - clock gate protocol
110  * @hdr: SCU protocol header
116  * This structure describes the SCU protocol of clock gate
137  * clk_scu_recalc_rate - Get clock rate for a SCU clock
141  * Gets the current clock rate of a SCU clock. Returns the current
152 	hdr->ver = IMX_SC_RPC_VERSION;  in clk_scu_recalc_rate()
153 	hdr->svc = IMX_SC_RPC_SVC_PM;  in clk_scu_recalc_rate()
154 	hdr->func = IMX_SC_PM_FUNC_GET_CLOCK_RATE;  in clk_scu_recalc_rate()
155 	hdr->size = 2;  in clk_scu_recalc_rate()
157 	msg.data.req.resource = cpu_to_le16(clk->rsrc_id);  in clk_scu_recalc_rate()
158 	msg.data.req.clk = clk->clk_type;  in clk_scu_recalc_rate()
171  * clk_scu_round_rate - Round clock rate for a SCU clock
182 	 * Assume we support all the requested rate and let the SCU firmware  in clk_scu_round_rate()
195 	if (clk->rsrc_id == IMX_SC_R_A35)  in clk_scu_atf_set_cpu_rate()
198 		return -EINVAL;  in clk_scu_atf_set_cpu_rate()
200 	/* CPU frequency scaling can ONLY be done by ARM-Trusted-Firmware */  in clk_scu_atf_set_cpu_rate()
208  * clk_scu_set_rate - Set rate for a SCU clock
211  * @parent_rate: rate of the clock parent, not used for SCU clocks
213  * Sets a clock frequency for a SCU clock. Returns the SCU
223 	hdr->ver = IMX_SC_RPC_VERSION;  in clk_scu_set_rate()
224 	hdr->svc = IMX_SC_RPC_SVC_PM;  in clk_scu_set_rate()
225 	hdr->func = IMX_SC_PM_FUNC_SET_CLOCK_RATE;  in clk_scu_set_rate()
226 	hdr->size = 3;  in clk_scu_set_rate()
229 	msg.resource = cpu_to_le16(clk->rsrc_id);  in clk_scu_set_rate()
230 	msg.clk = clk->clk_type;  in clk_scu_set_rate()
242 	hdr->ver = IMX_SC_RPC_VERSION;  in clk_scu_get_parent()
243 	hdr->svc = IMX_SC_RPC_SVC_PM;  in clk_scu_get_parent()
244 	hdr->func = IMX_SC_PM_FUNC_GET_CLOCK_PARENT;  in clk_scu_get_parent()
245 	hdr->size = 2;  in clk_scu_get_parent()
247 	msg.data.req.resource = cpu_to_le16(clk->rsrc_id);  in clk_scu_get_parent()
248 	msg.data.req.clk = clk->clk_type;  in clk_scu_get_parent()
260 static int clk_scu_set_parent(struct clk_hw *hw, u8 index)  in clk_scu_set_parent()  argument
266 	hdr->ver = IMX_SC_RPC_VERSION;  in clk_scu_set_parent()
267 	hdr->svc = IMX_SC_RPC_SVC_PM;  in clk_scu_set_parent()
268 	hdr->func = IMX_SC_PM_FUNC_SET_CLOCK_PARENT;  in clk_scu_set_parent()
269 	hdr->size = 2;  in clk_scu_set_parent()
271 	msg.resource = cpu_to_le16(clk->rsrc_id);  in clk_scu_set_parent()
272 	msg.clk = clk->clk_type;  in clk_scu_set_parent()
273 	msg.parent = index;  in clk_scu_set_parent()
284 	hdr->ver = IMX_SC_RPC_VERSION;  in sc_pm_clock_enable()
285 	hdr->svc = IMX_SC_RPC_SVC_PM;  in sc_pm_clock_enable()
286 	hdr->func = IMX_SC_PM_FUNC_CLOCK_ENABLE;  in sc_pm_clock_enable()
287 	hdr->size = 3;  in sc_pm_clock_enable()
298  * clk_scu_prepare - Enable a SCU clock
307 	return sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,  in clk_scu_prepare()
308 				  clk->clk_type, true, false);  in clk_scu_prepare()
312  * clk_scu_unprepare - Disable a SCU clock
322 	ret = sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,  in clk_scu_unprepare()
323 				 clk->clk_type, false, false);  in clk_scu_unprepare()
357 		return ERR_PTR(-ENOMEM);  in __imx_clk_scu()
359 	clk->rsrc_id = rsrc_id;  in __imx_clk_scu()
360 	clk->clk_type = clk_type;  in __imx_clk_scu()
379 	clk->hw.init = &init;  in __imx_clk_scu()
381 	hw = &clk->hw;  in __imx_clk_scu()