1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for the Intel P-Unit Mailbox IPC mechanism
7  * The heart of the P-Unit is the Foxton microcontroller and its firmware,
22 /* IPC Mailbox registers */
53 	return readl(ipcdev->base[type][BASE_IFACE]);  in ipc_read_status()
58 	writel(cmd, ipcdev->base[type][BASE_IFACE]);  in ipc_write_cmd()
63 	return readl(ipcdev->base[type][BASE_DATA] + OFFSET_DATA_LOW);  in ipc_read_data_low()
68 	return readl(ipcdev->base[type][BASE_DATA] + OFFSET_DATA_HIGH);  in ipc_read_data_high()
73 	writel(data, ipcdev->base[type][BASE_DATA] + OFFSET_DATA_LOW);  in ipc_write_data_low()
78 	writel(data, ipcdev->base[type][BASE_DATA] + OFFSET_DATA_HIGH);  in ipc_write_data_high()
107 	if (ipcdev->irq) {  in intel_punit_ipc_check_status()
108 		if (!wait_for_completion_timeout(&ipcdev->cmd_complete,  in intel_punit_ipc_check_status()
110 			dev_err(ipcdev->dev, "IPC timed out\n");  in intel_punit_ipc_check_status()
111 			return -ETIMEDOUT;  in intel_punit_ipc_check_status()
114 		while ((ipc_read_status(ipcdev, type) & CMD_RUN) && --loops)  in intel_punit_ipc_check_status()
117 			dev_err(ipcdev->dev, "IPC timed out\n");  in intel_punit_ipc_check_status()
118 			return -ETIMEDOUT;  in intel_punit_ipc_check_status()
125 		dev_err(ipcdev->dev, "IPC failed: %s, IPC_STS=0x%x\n",  in intel_punit_ipc_check_status()
127 		return -EIO;  in intel_punit_ipc_check_status()
134  * intel_punit_ipc_simple_command() - Simple IPC command
135  * @cmd:	IPC command code.
139  * Send a IPC command to P-Unit when there is no data transaction
141  * Return:	IPC error code or 0 on success.
150 	mutex_lock(&ipcdev->lock);  in intel_punit_ipc_simple_command()
152 	reinit_completion(&ipcdev->cmd_complete);  in intel_punit_ipc_simple_command()
160 	mutex_unlock(&ipcdev->lock);  in intel_punit_ipc_simple_command()
167  * intel_punit_ipc_command() - IPC command with data and pointers
168  * @cmd:	IPC command code.
174  * Send a IPC command to P-Unit with data transaction
176  * Return:	IPC error code or 0 on success.
185 	mutex_lock(&ipcdev->lock);  in intel_punit_ipc_command()
187 	reinit_completion(&ipcdev->cmd_complete);  in intel_punit_ipc_command()
211 	mutex_unlock(&ipcdev->lock);  in intel_punit_ipc_command()
220 	complete(&ipcdev->cmd_complete);  in intel_punit_ioc()
230 	 * - BIOS_IPC BASE_DATA  in intel_punit_get_bars()
231 	 * - BIOS_IPC BASE_IFACE  in intel_punit_get_bars()
236 	punit_ipcdev->base[BIOS_IPC][BASE_DATA] = addr;  in intel_punit_get_bars()
241 	punit_ipcdev->base[BIOS_IPC][BASE_IFACE] = addr;  in intel_punit_get_bars()
245 	 * - ISPDRIVER_IPC BASE_DATA  in intel_punit_get_bars()
246 	 * - ISPDRIVER_IPC BASE_IFACE  in intel_punit_get_bars()
247 	 * - GTDRIVER_IPC BASE_DATA  in intel_punit_get_bars()
248 	 * - GTDRIVER_IPC BASE_IFACE  in intel_punit_get_bars()
252 		punit_ipcdev->base[ISPDRIVER_IPC][BASE_DATA] = addr;  in intel_punit_get_bars()
254 	addr = devm_platform_ioremap_resource(pdev, 3);  in intel_punit_get_bars()
256 		punit_ipcdev->base[ISPDRIVER_IPC][BASE_IFACE] = addr;  in intel_punit_get_bars()
260 		punit_ipcdev->base[GTDRIVER_IPC][BASE_DATA] = addr;  in intel_punit_get_bars()
264 		punit_ipcdev->base[GTDRIVER_IPC][BASE_IFACE] = addr;  in intel_punit_get_bars()
273 	punit_ipcdev = devm_kzalloc(&pdev->dev,  in intel_punit_ipc_probe()
276 		return -ENOMEM;  in intel_punit_ipc_probe()
282 		dev_warn(&pdev->dev, "Invalid IRQ, using polling mode\n");  in intel_punit_ipc_probe()
284 		ret = devm_request_irq(&pdev->dev, irq, intel_punit_ioc,  in intel_punit_ipc_probe()
288 			dev_err(&pdev->dev, "Failed to request irq: %d\n", irq);  in intel_punit_ipc_probe()
291 		punit_ipcdev->irq = irq;  in intel_punit_ipc_probe()
298 	punit_ipcdev->dev = &pdev->dev;  in intel_punit_ipc_probe()
299 	mutex_init(&punit_ipcdev->lock);  in intel_punit_ipc_probe()
300 	init_completion(&punit_ipcdev->cmd_complete);  in intel_punit_ipc_probe()
330 MODULE_DESCRIPTION("Intel P-Unit IPC driver");