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174 lines
3.8 KiB
174 lines
3.8 KiB
// 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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* Implementation of the SCU IRQ functions using MU. |
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* |
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*/ |
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#include <dt-bindings/firmware/imx/rsrc.h> |
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#include <linux/firmware/imx/ipc.h> |
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#include <linux/firmware/imx/sci.h> |
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#include <linux/mailbox_client.h> |
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#include <linux/suspend.h> |
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#define IMX_SC_IRQ_FUNC_ENABLE 1 |
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#define IMX_SC_IRQ_FUNC_STATUS 2 |
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#define IMX_SC_IRQ_NUM_GROUP 4 |
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static u32 mu_resource_id; |
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struct imx_sc_msg_irq_get_status { |
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struct imx_sc_rpc_msg hdr; |
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union { |
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struct { |
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u16 resource; |
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u8 group; |
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u8 reserved; |
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} __packed req; |
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struct { |
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u32 status; |
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} resp; |
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} data; |
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}; |
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struct imx_sc_msg_irq_enable { |
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struct imx_sc_rpc_msg hdr; |
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u32 mask; |
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u16 resource; |
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u8 group; |
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u8 enable; |
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} __packed; |
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static struct imx_sc_ipc *imx_sc_irq_ipc_handle; |
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static struct work_struct imx_sc_irq_work; |
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static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain); |
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int imx_scu_irq_register_notifier(struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_register( |
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&imx_scu_irq_notifier_chain, nb); |
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} |
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EXPORT_SYMBOL(imx_scu_irq_register_notifier); |
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int imx_scu_irq_unregister_notifier(struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_unregister( |
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&imx_scu_irq_notifier_chain, nb); |
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} |
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EXPORT_SYMBOL(imx_scu_irq_unregister_notifier); |
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static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group) |
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{ |
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return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain, |
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status, (void *)group); |
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} |
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static void imx_scu_irq_work_handler(struct work_struct *work) |
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{ |
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struct imx_sc_msg_irq_get_status msg; |
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struct imx_sc_rpc_msg *hdr = &msg.hdr; |
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u32 irq_status; |
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int ret; |
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u8 i; |
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for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) { |
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hdr->ver = IMX_SC_RPC_VERSION; |
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hdr->svc = IMX_SC_RPC_SVC_IRQ; |
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hdr->func = IMX_SC_IRQ_FUNC_STATUS; |
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hdr->size = 2; |
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msg.data.req.resource = mu_resource_id; |
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msg.data.req.group = i; |
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ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true); |
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if (ret) { |
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pr_err("get irq group %d status failed, ret %d\n", |
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i, ret); |
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return; |
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} |
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irq_status = msg.data.resp.status; |
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if (!irq_status) |
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continue; |
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pm_system_wakeup(); |
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imx_scu_irq_notifier_call_chain(irq_status, &i); |
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} |
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} |
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int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable) |
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{ |
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struct imx_sc_msg_irq_enable msg; |
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struct imx_sc_rpc_msg *hdr = &msg.hdr; |
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int ret; |
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if (!imx_sc_irq_ipc_handle) |
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return -EPROBE_DEFER; |
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hdr->ver = IMX_SC_RPC_VERSION; |
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hdr->svc = IMX_SC_RPC_SVC_IRQ; |
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hdr->func = IMX_SC_IRQ_FUNC_ENABLE; |
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hdr->size = 3; |
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msg.resource = mu_resource_id; |
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msg.group = group; |
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msg.mask = mask; |
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msg.enable = enable; |
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ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true); |
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if (ret) |
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pr_err("enable irq failed, group %d, mask %d, ret %d\n", |
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group, mask, ret); |
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return ret; |
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} |
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EXPORT_SYMBOL(imx_scu_irq_group_enable); |
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static void imx_scu_irq_callback(struct mbox_client *c, void *msg) |
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{ |
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schedule_work(&imx_sc_irq_work); |
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} |
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int imx_scu_enable_general_irq_channel(struct device *dev) |
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{ |
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struct of_phandle_args spec; |
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struct mbox_client *cl; |
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struct mbox_chan *ch; |
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int ret = 0, i = 0; |
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ret = imx_scu_get_handle(&imx_sc_irq_ipc_handle); |
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if (ret) |
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return ret; |
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cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL); |
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if (!cl) |
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return -ENOMEM; |
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cl->dev = dev; |
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cl->rx_callback = imx_scu_irq_callback; |
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/* SCU general IRQ uses general interrupt channel 3 */ |
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ch = mbox_request_channel_byname(cl, "gip3"); |
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if (IS_ERR(ch)) { |
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ret = PTR_ERR(ch); |
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dev_err(dev, "failed to request mbox chan gip3, ret %d\n", ret); |
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devm_kfree(dev, cl); |
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return ret; |
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} |
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INIT_WORK(&imx_sc_irq_work, imx_scu_irq_work_handler); |
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if (!of_parse_phandle_with_args(dev->of_node, "mboxes", |
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"#mbox-cells", 0, &spec)) |
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i = of_alias_get_id(spec.np, "mu"); |
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/* use mu1 as general mu irq channel if failed */ |
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if (i < 0) |
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i = 1; |
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mu_resource_id = IMX_SC_R_MU_0A + i; |
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return ret; |
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} |
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EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);
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