[PATCH V5 7/9] clk: imx: scu: add scu clock mux
From: aisheng.dong@nxp.com (A.s. Dong)
Date: 2018-10-18 16:57:09
Also in:
linux-clk
Subsystem:
common clk framework, nxp i.mx clock drivers, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Abel Vesa, Linus Torvalds
Add scu based clock mux. Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Fabio Estevam <redacted> Cc: Stephen Boyd <sboyd@kernel.org> Cc: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> --- ChangeLog: v4->v5: * use union to avoid struct cast for IPC read msg * remove unnecessary debug messages * move scu clk files into imx top directory v3->v4: * scu headfile path update v2->v3: * structure name and api usage update v1->v2: * move SCU clock API implementation into driver --- drivers/clk/imx/Makefile | 3 +- drivers/clk/imx/clk-mux-scu.c | 123 ++++++++++++++++++++++++++++++++++++++++++ drivers/clk/imx/clk-scu.h | 13 +++++ 3 files changed, 138 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/imx/clk-mux-scu.c
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index 4564175..5f1cece 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile@@ -18,7 +18,8 @@ obj-$(CONFIG_MXC_CLK_SCU) += \ clk-divider-scu.o \ clk-divider-gpr-scu.o \ clk-gate-scu.o \ - clk-gate-gpr-scu.o + clk-gate-gpr-scu.o \ + clk-mux-scu.o obj-$(CONFIG_SOC_IMX1) += clk-imx1.o obj-$(CONFIG_SOC_IMX21) += clk-imx21.o
diff --git a/drivers/clk/imx/clk-mux-scu.c b/drivers/clk/imx/clk-mux-scu.c
new file mode 100644
index 0000000..8addff1
--- /dev/null
+++ b/drivers/clk/imx/clk-mux-scu.c@@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2016 Freescale Semiconductor, Inc. + * Copyright 2017~2018 NXP + * Dong Aisheng <aisheng.dong@nxp.com> + */ + +#include <linux/clk-provider.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include "clk-scu.h" + +struct clk_mux_scu { + struct clk_hw hw; + u32 rsrc_id; + u8 clk_type; +}; + +#define to_clk_mux_scu(_hw) container_of(_hw, struct clk_mux_scu, hw) + +/* SCU Clock Protocol definitions */ +struct imx_sc_msg_req_set_clock_parent { + struct imx_sc_rpc_msg hdr; + u16 resource; + u8 clk; + u8 parent; +} __packed; + +struct req_get_clock_parent { + u16 resource; + u8 clk; +} __packed; + +struct resp_get_clock_parent { + u8 parent; +}; + +struct imx_sc_msg_get_clock_parent { + struct imx_sc_rpc_msg hdr; + union { + struct req_get_clock_parent req; + struct resp_get_clock_parent resp; + } data; +} __packed; + +static u8 clk_mux_scu_get_parent(struct clk_hw *hw) +{ + struct clk_mux_scu *mux = to_clk_mux_scu(hw); + struct imx_sc_msg_get_clock_parent msg; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + int ret; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = IMX_SC_RPC_SVC_PM; + hdr->func = IMX_SC_PM_FUNC_GET_CLOCK_PARENT; + hdr->size = 2; + + msg.data.req.resource = mux->rsrc_id; + msg.data.req.clk = mux->clk_type; + + ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true); + if (ret) + return ret; + + return msg.data.resp.parent; +} + +static int clk_mux_scu_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_mux_scu *mux = to_clk_mux_scu(hw); + struct imx_sc_msg_req_set_clock_parent msg; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = IMX_SC_RPC_SVC_PM; + hdr->func = IMX_SC_PM_FUNC_SET_CLOCK_PARENT; + hdr->size = 2; + + msg.resource = mux->rsrc_id; + msg.clk = mux->clk_type; + msg.parent = index; + + return imx_scu_call_rpc(ccm_ipc_handle, &msg, true); +} + +static const struct clk_ops clk_mux_scu_ops = { + .get_parent = clk_mux_scu_get_parent, + .set_parent = clk_mux_scu_set_parent, +}; + +struct clk_hw *clk_register_mux_scu(const char *name, const char * const *parents, + int num_parents, unsigned long flags, + u32 rsrc_id, u8 clk_type) +{ + struct clk_init_data init; + struct clk_mux_scu *mux; + struct clk_hw *hw; + int ret; + + mux = kzalloc(sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &clk_mux_scu_ops; + init.parent_names = parents; + init.num_parents = num_parents; + + mux->hw.init = &init; + mux->rsrc_id = rsrc_id; + mux->clk_type = clk_type; + + hw = &mux->hw; + ret = clk_hw_register(NULL, hw); + if (ret) { + kfree(mux); + hw = ERR_PTR(ret); + } + + return hw; +}
diff --git a/drivers/clk/imx/clk-scu.h b/drivers/clk/imx/clk-scu.h
index 673b280..2a5a45e 100644
--- a/drivers/clk/imx/clk-scu.h
+++ b/drivers/clk/imx/clk-scu.h@@ -68,4 +68,17 @@ static inline struct clk_hw *imx_clk_gate_gpr_scu(const char *name, const char * return clk_register_gate_gpr_scu(name, parent, rsrc_id, gpr_id, invert_flag); } +struct clk_hw *clk_register_mux_scu(const char *name, const char * const *parents, + int num_parents, unsigned long flags, + u32 rsrc_id, u8 clk_type); + +static inline struct clk_hw *imx_clk_mux_scu(const char *name, + const char * const *parents, int num_parents, + u32 rsrc_id, u8 clk_type) +{ + return clk_register_mux_scu(name, parents, num_parents, + CLK_SET_RATE_NO_REPARENT, rsrc_id, + clk_type); +} + #endif
--
2.7.4