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a24015fa8b
The i.MX SCU soc driver depends on SCU firmware driver, so it has to use platform driver model for proper defer probe operation, since it has no device binding in DT file, a simple platform device is created together inside the platform driver. To make it more clean, we can just move the entire SCU soc driver into imx firmware folder and initialized by i.MX SCU firmware driver. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 NXP.
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*/
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#include <dt-bindings/firmware/imx/rsrc.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
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struct imx_sc_msg_misc_get_soc_id {
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struct imx_sc_rpc_msg hdr;
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union {
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struct {
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u32 control;
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u16 resource;
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} __packed req;
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struct {
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u32 id;
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} resp;
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} data;
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} __packed __aligned(4);
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struct imx_sc_msg_misc_get_soc_uid {
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struct imx_sc_rpc_msg hdr;
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u32 uid_low;
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u32 uid_high;
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} __packed;
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static int imx_scu_soc_uid(u64 *soc_uid)
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{
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struct imx_sc_msg_misc_get_soc_uid msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
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hdr->size = 1;
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ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
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if (ret) {
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pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
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return ret;
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}
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*soc_uid = msg.uid_high;
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*soc_uid <<= 32;
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*soc_uid |= msg.uid_low;
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return 0;
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}
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static int imx_scu_soc_id(void)
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{
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struct imx_sc_msg_misc_get_soc_id msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
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hdr->size = 3;
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msg.data.req.control = IMX_SC_C_ID;
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msg.data.req.resource = IMX_SC_R_SYSTEM;
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ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
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if (ret) {
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pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
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return ret;
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}
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return msg.data.resp.id;
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}
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int imx_scu_soc_init(struct device *dev)
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{
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struct soc_device_attribute *soc_dev_attr;
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struct soc_device *soc_dev;
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int id, ret;
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u64 uid = 0;
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u32 val;
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ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
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if (ret)
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return ret;
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soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
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GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->family = "Freescale i.MX";
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ret = of_property_read_string(of_root,
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"model",
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&soc_dev_attr->machine);
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if (ret)
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return ret;
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id = imx_scu_soc_id();
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if (id < 0)
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return -EINVAL;
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ret = imx_scu_soc_uid(&uid);
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if (ret < 0)
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return -EINVAL;
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/* format soc_id value passed from SCU firmware */
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val = id & 0x1f;
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soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
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if (!soc_dev_attr->soc_id)
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return -ENOMEM;
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/* format revision value passed from SCU firmware */
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val = (id >> 5) & 0xf;
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val = (((val >> 2) + 1) << 4) | (val & 0x3);
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soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
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(val >> 4) & 0xf, val & 0xf);
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if (!soc_dev_attr->revision)
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return -ENOMEM;
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soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
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"%016llX", uid);
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if (!soc_dev_attr->serial_number)
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return -ENOMEM;
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev))
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return PTR_ERR(soc_dev);
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return 0;
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}
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