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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/clk/imx/clk-scu.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/imx/clk-scu.c')
-rw-r--r--drivers/clk/imx/clk-scu.c912
1 files changed, 912 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
new file mode 100644
index 0000000000..cd83c52e99
--- /dev/null
+++ b/drivers/clk/imx/clk-scu.c
@@ -0,0 +1,912 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2021 NXP
+ * Dong Aisheng <aisheng.dong@nxp.com>
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/arm-smccc.h>
+#include <linux/bsearch.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "clk-scu.h"
+
+#define IMX_SIP_CPUFREQ 0xC2000001
+#define IMX_SIP_SET_CPUFREQ 0x00
+
+static struct imx_sc_ipc *ccm_ipc_handle;
+static struct device_node *pd_np;
+static struct platform_driver imx_clk_scu_driver;
+static const struct imx_clk_scu_rsrc_table *rsrc_table;
+
+struct imx_scu_clk_node {
+ const char *name;
+ u32 rsrc;
+ u8 clk_type;
+ const char * const *parents;
+ int num_parents;
+
+ struct clk_hw *hw;
+ struct list_head node;
+};
+
+struct list_head imx_scu_clks[IMX_SC_R_LAST];
+
+/*
+ * struct clk_scu - Description of one SCU clock
+ * @hw: the common clk_hw
+ * @rsrc_id: resource ID of this SCU clock
+ * @clk_type: type of this clock resource
+ */
+struct clk_scu {
+ struct clk_hw hw;
+ u16 rsrc_id;
+ u8 clk_type;
+
+ /* for state save&restore */
+ struct clk_hw *parent;
+ u8 parent_index;
+ bool is_enabled;
+ u32 rate;
+};
+
+/*
+ * struct clk_gpr_scu - Description of one SCU GPR clock
+ * @hw: the common clk_hw
+ * @rsrc_id: resource ID of this SCU clock
+ * @gpr_id: GPR ID index to control the divider
+ */
+struct clk_gpr_scu {
+ struct clk_hw hw;
+ u16 rsrc_id;
+ u8 gpr_id;
+ u8 flags;
+ bool gate_invert;
+};
+
+#define to_clk_gpr_scu(_hw) container_of(_hw, struct clk_gpr_scu, hw)
+
+/*
+ * struct imx_sc_msg_req_set_clock_rate - clock set rate protocol
+ * @hdr: SCU protocol header
+ * @rate: rate to set
+ * @resource: clock resource to set rate
+ * @clk: clk type of this resource
+ *
+ * This structure describes the SCU protocol of clock rate set
+ */
+struct imx_sc_msg_req_set_clock_rate {
+ struct imx_sc_rpc_msg hdr;
+ __le32 rate;
+ __le16 resource;
+ u8 clk;
+} __packed __aligned(4);
+
+struct req_get_clock_rate {
+ __le16 resource;
+ u8 clk;
+} __packed __aligned(4);
+
+struct resp_get_clock_rate {
+ __le32 rate;
+};
+
+/*
+ * struct imx_sc_msg_get_clock_rate - clock get rate protocol
+ * @hdr: SCU protocol header
+ * @req: get rate request protocol
+ * @resp: get rate response protocol
+ *
+ * This structure describes the SCU protocol of clock rate get
+ */
+struct imx_sc_msg_get_clock_rate {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct req_get_clock_rate req;
+ struct resp_get_clock_rate resp;
+ } data;
+};
+
+/*
+ * struct imx_sc_msg_get_clock_parent - clock get parent protocol
+ * @hdr: SCU protocol header
+ * @req: get parent request protocol
+ * @resp: get parent response protocol
+ *
+ * This structure describes the SCU protocol of clock get parent
+ */
+struct imx_sc_msg_get_clock_parent {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct req_get_clock_parent {
+ __le16 resource;
+ u8 clk;
+ } __packed __aligned(4) req;
+ struct resp_get_clock_parent {
+ u8 parent;
+ } resp;
+ } data;
+};
+
+/*
+ * struct imx_sc_msg_set_clock_parent - clock set parent protocol
+ * @hdr: SCU protocol header
+ * @req: set parent request protocol
+ *
+ * This structure describes the SCU protocol of clock set parent
+ */
+struct imx_sc_msg_set_clock_parent {
+ struct imx_sc_rpc_msg hdr;
+ __le16 resource;
+ u8 clk;
+ u8 parent;
+} __packed;
+
+/*
+ * struct imx_sc_msg_req_clock_enable - clock gate protocol
+ * @hdr: SCU protocol header
+ * @resource: clock resource to gate
+ * @clk: clk type of this resource
+ * @enable: whether gate off the clock
+ * @autog: HW auto gate enable
+ *
+ * This structure describes the SCU protocol of clock gate
+ */
+struct imx_sc_msg_req_clock_enable {
+ struct imx_sc_rpc_msg hdr;
+ __le16 resource;
+ u8 clk;
+ u8 enable;
+ u8 autog;
+} __packed __aligned(4);
+
+static inline struct clk_scu *to_clk_scu(struct clk_hw *hw)
+{
+ return container_of(hw, struct clk_scu, hw);
+}
+
+static inline int imx_scu_clk_search_cmp(const void *rsrc, const void *rsrc_p)
+{
+ return *(u32 *)rsrc - *(u32 *)rsrc_p;
+}
+
+static bool imx_scu_clk_is_valid(u32 rsrc_id)
+{
+ void *p;
+
+ if (!rsrc_table)
+ return true;
+
+ p = bsearch(&rsrc_id, rsrc_table->rsrc, rsrc_table->num,
+ sizeof(rsrc_table->rsrc[0]), imx_scu_clk_search_cmp);
+
+ return p != NULL;
+}
+
+int imx_clk_scu_init(struct device_node *np,
+ const struct imx_clk_scu_rsrc_table *data)
+{
+ u32 clk_cells;
+ int ret, i;
+
+ ret = imx_scu_get_handle(&ccm_ipc_handle);
+ if (ret)
+ return ret;
+
+ of_property_read_u32(np, "#clock-cells", &clk_cells);
+
+ if (clk_cells == 2) {
+ for (i = 0; i < IMX_SC_R_LAST; i++)
+ INIT_LIST_HEAD(&imx_scu_clks[i]);
+
+ /* pd_np will be used to attach power domains later */
+ pd_np = of_find_compatible_node(NULL, NULL, "fsl,scu-pd");
+ if (!pd_np)
+ return -EINVAL;
+
+ rsrc_table = data;
+ }
+
+ return platform_driver_register(&imx_clk_scu_driver);
+}
+
+/*
+ * clk_scu_recalc_rate - Get clock rate for a SCU clock
+ * @hw: clock to get rate for
+ * @parent_rate: parent rate provided by common clock framework, not used
+ *
+ * Gets the current clock rate of a SCU clock. Returns the current
+ * clock rate, or zero in failure.
+ */
+static unsigned long clk_scu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+ struct imx_sc_msg_get_clock_rate 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_RATE;
+ hdr->size = 2;
+
+ msg.data.req.resource = cpu_to_le16(clk->rsrc_id);
+ msg.data.req.clk = clk->clk_type;
+
+ ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+ if (ret) {
+ pr_err("%s: failed to get clock rate %d\n",
+ clk_hw_get_name(hw), ret);
+ return 0;
+ }
+
+ return le32_to_cpu(msg.data.resp.rate);
+}
+
+/*
+ * clk_scu_determine_rate - Returns the closest rate for a SCU clock
+ * @hw: clock to round rate for
+ * @req: clock rate request
+ *
+ * Returns 0 on success, a negative error on failure
+ */
+static int clk_scu_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ /*
+ * Assume we support all the requested rate and let the SCU firmware
+ * to handle the left work
+ */
+ return 0;
+}
+
+/*
+ * clk_scu_round_rate - Round clock rate for a SCU clock
+ * @hw: clock to round rate for
+ * @rate: rate to round
+ * @parent_rate: parent rate provided by common clock framework, not used
+ *
+ * Returns the current clock rate, or zero in failure.
+ */
+static long clk_scu_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ /*
+ * Assume we support all the requested rate and let the SCU firmware
+ * to handle the left work
+ */
+ return rate;
+}
+
+static int clk_scu_atf_set_cpu_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+ struct arm_smccc_res res;
+ unsigned long cluster_id;
+
+ if (clk->rsrc_id == IMX_SC_R_A35 || clk->rsrc_id == IMX_SC_R_A53)
+ cluster_id = 0;
+ else if (clk->rsrc_id == IMX_SC_R_A72)
+ cluster_id = 1;
+ else
+ return -EINVAL;
+
+ /* CPU frequency scaling can ONLY be done by ARM-Trusted-Firmware */
+ arm_smccc_smc(IMX_SIP_CPUFREQ, IMX_SIP_SET_CPUFREQ,
+ cluster_id, rate, 0, 0, 0, 0, &res);
+
+ return 0;
+}
+
+/*
+ * clk_scu_set_rate - Set rate for a SCU clock
+ * @hw: clock to change rate for
+ * @rate: target rate for the clock
+ * @parent_rate: rate of the clock parent, not used for SCU clocks
+ *
+ * Sets a clock frequency for a SCU clock. Returns the SCU
+ * protocol status.
+ */
+static int clk_scu_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+ struct imx_sc_msg_req_set_clock_rate 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_RATE;
+ hdr->size = 3;
+
+ msg.rate = cpu_to_le32(rate);
+ msg.resource = cpu_to_le16(clk->rsrc_id);
+ msg.clk = clk->clk_type;
+
+ return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+}
+
+static u8 clk_scu_get_parent(struct clk_hw *hw)
+{
+ struct clk_scu *clk = to_clk_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 = cpu_to_le16(clk->rsrc_id);
+ msg.data.req.clk = clk->clk_type;
+
+ ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+ if (ret) {
+ pr_err("%s: failed to get clock parent %d\n",
+ clk_hw_get_name(hw), ret);
+ return 0;
+ }
+
+ clk->parent_index = msg.data.resp.parent;
+
+ return msg.data.resp.parent;
+}
+
+static int clk_scu_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+ struct imx_sc_msg_set_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_SET_CLOCK_PARENT;
+ hdr->size = 2;
+
+ msg.resource = cpu_to_le16(clk->rsrc_id);
+ msg.clk = clk->clk_type;
+ msg.parent = index;
+
+ ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+ if (ret) {
+ pr_err("%s: failed to set clock parent %d\n",
+ clk_hw_get_name(hw), ret);
+ return ret;
+ }
+
+ clk->parent_index = index;
+
+ return 0;
+}
+
+static int sc_pm_clock_enable(struct imx_sc_ipc *ipc, u16 resource,
+ u8 clk, bool enable, bool autog)
+{
+ struct imx_sc_msg_req_clock_enable 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_CLOCK_ENABLE;
+ hdr->size = 3;
+
+ msg.resource = cpu_to_le16(resource);
+ msg.clk = clk;
+ msg.enable = enable;
+ msg.autog = autog;
+
+ return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+}
+
+/*
+ * clk_scu_prepare - Enable a SCU clock
+ * @hw: clock to enable
+ *
+ * Enable the clock at the DSC slice level
+ */
+static int clk_scu_prepare(struct clk_hw *hw)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+
+ return sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,
+ clk->clk_type, true, false);
+}
+
+/*
+ * clk_scu_unprepare - Disable a SCU clock
+ * @hw: clock to enable
+ *
+ * Disable the clock at the DSC slice level
+ */
+static void clk_scu_unprepare(struct clk_hw *hw)
+{
+ struct clk_scu *clk = to_clk_scu(hw);
+ int ret;
+
+ ret = sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,
+ clk->clk_type, false, false);
+ if (ret)
+ pr_warn("%s: clk unprepare failed %d\n", clk_hw_get_name(hw),
+ ret);
+}
+
+static const struct clk_ops clk_scu_ops = {
+ .recalc_rate = clk_scu_recalc_rate,
+ .determine_rate = clk_scu_determine_rate,
+ .set_rate = clk_scu_set_rate,
+ .get_parent = clk_scu_get_parent,
+ .set_parent = clk_scu_set_parent,
+ .prepare = clk_scu_prepare,
+ .unprepare = clk_scu_unprepare,
+};
+
+static const struct clk_ops clk_scu_cpu_ops = {
+ .recalc_rate = clk_scu_recalc_rate,
+ .round_rate = clk_scu_round_rate,
+ .set_rate = clk_scu_atf_set_cpu_rate,
+ .prepare = clk_scu_prepare,
+ .unprepare = clk_scu_unprepare,
+};
+
+static const struct clk_ops clk_scu_pi_ops = {
+ .recalc_rate = clk_scu_recalc_rate,
+ .round_rate = clk_scu_round_rate,
+ .set_rate = clk_scu_set_rate,
+};
+
+struct clk_hw *__imx_clk_scu(struct device *dev, const char *name,
+ const char * const *parents, int num_parents,
+ u32 rsrc_id, u8 clk_type)
+{
+ struct clk_init_data init;
+ struct clk_scu *clk;
+ struct clk_hw *hw;
+ int ret;
+
+ clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+ if (!clk)
+ return ERR_PTR(-ENOMEM);
+
+ clk->rsrc_id = rsrc_id;
+ clk->clk_type = clk_type;
+
+ init.name = name;
+ init.ops = &clk_scu_ops;
+ if (rsrc_id == IMX_SC_R_A35 || rsrc_id == IMX_SC_R_A53 || rsrc_id == IMX_SC_R_A72)
+ init.ops = &clk_scu_cpu_ops;
+ else if (rsrc_id == IMX_SC_R_PI_0_PLL)
+ init.ops = &clk_scu_pi_ops;
+ else
+ init.ops = &clk_scu_ops;
+ init.parent_names = parents;
+ init.num_parents = num_parents;
+
+ /*
+ * Note on MX8, the clocks are tightly coupled with power domain
+ * that once the power domain is off, the clock status may be
+ * lost. So we make it NOCACHE to let user to retrieve the real
+ * clock status from HW instead of using the possible invalid
+ * cached rate.
+ */
+ init.flags = CLK_GET_RATE_NOCACHE;
+ clk->hw.init = &init;
+
+ hw = &clk->hw;
+ ret = clk_hw_register(dev, hw);
+ if (ret) {
+ kfree(clk);
+ hw = ERR_PTR(ret);
+ return hw;
+ }
+
+ if (dev)
+ dev_set_drvdata(dev, clk);
+
+ return hw;
+}
+
+struct clk_hw *imx_scu_of_clk_src_get(struct of_phandle_args *clkspec,
+ void *data)
+{
+ unsigned int rsrc = clkspec->args[0];
+ unsigned int idx = clkspec->args[1];
+ struct list_head *scu_clks = data;
+ struct imx_scu_clk_node *clk;
+
+ list_for_each_entry(clk, &scu_clks[rsrc], node) {
+ if (clk->clk_type == idx)
+ return clk->hw;
+ }
+
+ return ERR_PTR(-ENODEV);
+}
+
+static int imx_clk_scu_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx_scu_clk_node *clk = dev_get_platdata(dev);
+ struct clk_hw *hw;
+ int ret;
+
+ if (!((clk->rsrc == IMX_SC_R_A35) || (clk->rsrc == IMX_SC_R_A53) ||
+ (clk->rsrc == IMX_SC_R_A72))) {
+ pm_runtime_set_suspended(dev);
+ pm_runtime_set_autosuspend_delay(dev, 50);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_enable(dev);
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret) {
+ pm_genpd_remove_device(dev);
+ pm_runtime_disable(dev);
+ return ret;
+ }
+ }
+
+ hw = __imx_clk_scu(dev, clk->name, clk->parents, clk->num_parents,
+ clk->rsrc, clk->clk_type);
+ if (IS_ERR(hw)) {
+ pm_runtime_disable(dev);
+ return PTR_ERR(hw);
+ }
+
+ clk->hw = hw;
+ list_add_tail(&clk->node, &imx_scu_clks[clk->rsrc]);
+
+ if (!((clk->rsrc == IMX_SC_R_A35) || (clk->rsrc == IMX_SC_R_A53) ||
+ (clk->rsrc == IMX_SC_R_A72))) {
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
+ }
+
+ dev_dbg(dev, "register SCU clock rsrc:%d type:%d\n", clk->rsrc,
+ clk->clk_type);
+
+ return 0;
+}
+
+static int __maybe_unused imx_clk_scu_suspend(struct device *dev)
+{
+ struct clk_scu *clk = dev_get_drvdata(dev);
+ u32 rsrc_id = clk->rsrc_id;
+
+ if ((rsrc_id == IMX_SC_R_A35) || (rsrc_id == IMX_SC_R_A53) ||
+ (rsrc_id == IMX_SC_R_A72))
+ return 0;
+
+ clk->parent = clk_hw_get_parent(&clk->hw);
+
+ /* DC SS needs to handle bypass clock using non-cached clock rate */
+ if (clk->rsrc_id == IMX_SC_R_DC_0_VIDEO0 ||
+ clk->rsrc_id == IMX_SC_R_DC_0_VIDEO1 ||
+ clk->rsrc_id == IMX_SC_R_DC_1_VIDEO0 ||
+ clk->rsrc_id == IMX_SC_R_DC_1_VIDEO1)
+ clk->rate = clk_scu_recalc_rate(&clk->hw, 0);
+ else
+ clk->rate = clk_hw_get_rate(&clk->hw);
+ clk->is_enabled = clk_hw_is_enabled(&clk->hw);
+
+ if (clk->parent)
+ dev_dbg(dev, "save parent %s idx %u\n", clk_hw_get_name(clk->parent),
+ clk->parent_index);
+
+ if (clk->rate)
+ dev_dbg(dev, "save rate %d\n", clk->rate);
+
+ if (clk->is_enabled)
+ dev_dbg(dev, "save enabled state\n");
+
+ return 0;
+}
+
+static int __maybe_unused imx_clk_scu_resume(struct device *dev)
+{
+ struct clk_scu *clk = dev_get_drvdata(dev);
+ u32 rsrc_id = clk->rsrc_id;
+ int ret = 0;
+
+ if ((rsrc_id == IMX_SC_R_A35) || (rsrc_id == IMX_SC_R_A53) ||
+ (rsrc_id == IMX_SC_R_A72))
+ return 0;
+
+ if (clk->parent) {
+ ret = clk_scu_set_parent(&clk->hw, clk->parent_index);
+ dev_dbg(dev, "restore parent %s idx %u %s\n",
+ clk_hw_get_name(clk->parent),
+ clk->parent_index, !ret ? "success" : "failed");
+ }
+
+ if (clk->rate) {
+ ret = clk_scu_set_rate(&clk->hw, clk->rate, 0);
+ dev_dbg(dev, "restore rate %d %s\n", clk->rate,
+ !ret ? "success" : "failed");
+ }
+
+ if (clk->is_enabled && rsrc_id != IMX_SC_R_PI_0_PLL) {
+ ret = clk_scu_prepare(&clk->hw);
+ dev_dbg(dev, "restore enabled state %s\n",
+ !ret ? "success" : "failed");
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops imx_clk_scu_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_scu_suspend,
+ imx_clk_scu_resume)
+};
+
+static struct platform_driver imx_clk_scu_driver = {
+ .driver = {
+ .name = "imx-scu-clk",
+ .suppress_bind_attrs = true,
+ .pm = &imx_clk_scu_pm_ops,
+ },
+ .probe = imx_clk_scu_probe,
+};
+
+static int imx_clk_scu_attach_pd(struct device *dev, u32 rsrc_id)
+{
+ struct of_phandle_args genpdspec = {
+ .np = pd_np,
+ .args_count = 1,
+ .args[0] = rsrc_id,
+ };
+
+ if (rsrc_id == IMX_SC_R_A35 || rsrc_id == IMX_SC_R_A53 ||
+ rsrc_id == IMX_SC_R_A72)
+ return 0;
+
+ return of_genpd_add_device(&genpdspec, dev);
+}
+
+struct clk_hw *imx_clk_scu_alloc_dev(const char *name,
+ const char * const *parents,
+ int num_parents, u32 rsrc_id, u8 clk_type)
+{
+ struct imx_scu_clk_node clk = {
+ .name = name,
+ .rsrc = rsrc_id,
+ .clk_type = clk_type,
+ .parents = parents,
+ .num_parents = num_parents,
+ };
+ struct platform_device *pdev;
+ int ret;
+
+ if (!imx_scu_clk_is_valid(rsrc_id))
+ return ERR_PTR(-EINVAL);
+
+ pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE);
+ if (!pdev) {
+ pr_err("%s: failed to allocate scu clk dev rsrc %d type %d\n",
+ name, rsrc_id, clk_type);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = platform_device_add_data(pdev, &clk, sizeof(clk));
+ if (ret) {
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
+
+ ret = driver_set_override(&pdev->dev, &pdev->driver_override,
+ "imx-scu-clk", strlen("imx-scu-clk"));
+ if (ret) {
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
+
+ ret = imx_clk_scu_attach_pd(&pdev->dev, rsrc_id);
+ if (ret)
+ pr_warn("%s: failed to attached the power domain %d\n",
+ name, ret);
+
+ ret = platform_device_add(pdev);
+ if (ret) {
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
+
+ /* For API backwards compatiblilty, simply return NULL for success */
+ return NULL;
+}
+
+void imx_clk_scu_unregister(void)
+{
+ struct imx_scu_clk_node *clk, *n;
+ int i;
+
+ for (i = 0; i < IMX_SC_R_LAST; i++) {
+ list_for_each_entry_safe(clk, n, &imx_scu_clks[i], node) {
+ clk_hw_unregister(clk->hw);
+ kfree(clk);
+ }
+ }
+}
+
+static unsigned long clk_gpr_div_scu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+ unsigned long rate = 0;
+ u32 val;
+ int err;
+
+ err = imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, &val);
+
+ rate = val ? parent_rate / 2 : parent_rate;
+
+ return err ? 0 : rate;
+}
+
+static long clk_gpr_div_scu_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ if (rate < *prate)
+ rate = *prate / 2;
+ else
+ rate = *prate;
+
+ return rate;
+}
+
+static int clk_gpr_div_scu_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+ uint32_t val;
+ int err;
+
+ val = (rate < parent_rate) ? 1 : 0;
+ err = imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, val);
+
+ return err ? -EINVAL : 0;
+}
+
+static const struct clk_ops clk_gpr_div_scu_ops = {
+ .recalc_rate = clk_gpr_div_scu_recalc_rate,
+ .round_rate = clk_gpr_div_scu_round_rate,
+ .set_rate = clk_gpr_div_scu_set_rate,
+};
+
+static u8 clk_gpr_mux_scu_get_parent(struct clk_hw *hw)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+ u32 val = 0;
+
+ imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, &val);
+
+ return (u8)val;
+}
+
+static int clk_gpr_mux_scu_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+
+ return imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, index);
+}
+
+static const struct clk_ops clk_gpr_mux_scu_ops = {
+ .determine_rate = clk_hw_determine_rate_no_reparent,
+ .get_parent = clk_gpr_mux_scu_get_parent,
+ .set_parent = clk_gpr_mux_scu_set_parent,
+};
+
+static int clk_gpr_gate_scu_prepare(struct clk_hw *hw)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+
+ return imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, !clk->gate_invert);
+}
+
+static void clk_gpr_gate_scu_unprepare(struct clk_hw *hw)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+ int ret;
+
+ ret = imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, clk->gate_invert);
+ if (ret)
+ pr_err("%s: clk unprepare failed %d\n", clk_hw_get_name(hw),
+ ret);
+}
+
+static int clk_gpr_gate_scu_is_prepared(struct clk_hw *hw)
+{
+ struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+ int ret;
+ u32 val;
+
+ ret = imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+ clk->gpr_id, &val);
+ if (ret)
+ return ret;
+
+ return clk->gate_invert ? !val : val;
+}
+
+static const struct clk_ops clk_gpr_gate_scu_ops = {
+ .prepare = clk_gpr_gate_scu_prepare,
+ .unprepare = clk_gpr_gate_scu_unprepare,
+ .is_prepared = clk_gpr_gate_scu_is_prepared,
+};
+
+struct clk_hw *__imx_clk_gpr_scu(const char *name, const char * const *parent_name,
+ int num_parents, u32 rsrc_id, u8 gpr_id, u8 flags,
+ bool invert)
+{
+ struct imx_scu_clk_node *clk_node;
+ struct clk_gpr_scu *clk;
+ struct clk_hw *hw;
+ struct clk_init_data init;
+ int ret;
+
+ if (rsrc_id >= IMX_SC_R_LAST || gpr_id >= IMX_SC_C_LAST)
+ return ERR_PTR(-EINVAL);
+
+ clk_node = kzalloc(sizeof(*clk_node), GFP_KERNEL);
+ if (!clk_node)
+ return ERR_PTR(-ENOMEM);
+
+ if (!imx_scu_clk_is_valid(rsrc_id)) {
+ kfree(clk_node);
+ return ERR_PTR(-EINVAL);
+ }
+
+ clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+ if (!clk) {
+ kfree(clk_node);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ clk->rsrc_id = rsrc_id;
+ clk->gpr_id = gpr_id;
+ clk->flags = flags;
+ clk->gate_invert = invert;
+
+ if (flags & IMX_SCU_GPR_CLK_GATE)
+ init.ops = &clk_gpr_gate_scu_ops;
+
+ if (flags & IMX_SCU_GPR_CLK_DIV)
+ init.ops = &clk_gpr_div_scu_ops;
+
+ if (flags & IMX_SCU_GPR_CLK_MUX)
+ init.ops = &clk_gpr_mux_scu_ops;
+
+ init.flags = 0;
+ init.name = name;
+ init.parent_names = parent_name;
+ init.num_parents = num_parents;
+
+ clk->hw.init = &init;
+
+ hw = &clk->hw;
+ ret = clk_hw_register(NULL, hw);
+ if (ret) {
+ kfree(clk);
+ kfree(clk_node);
+ hw = ERR_PTR(ret);
+ } else {
+ clk_node->hw = hw;
+ clk_node->clk_type = gpr_id;
+ list_add_tail(&clk_node->node, &imx_scu_clks[rsrc_id]);
+ }
+
+ return hw;
+}