1 // SPDX-License-Identifier: GPL-2.0+
22 #define DRV_NAME "hisi-lpc"
42 /* The max IO cycle counts supported is four per operation at maximum */
84 			return (status & LPC_REG_OP_STATUS_FINISHED) ? 0 : -EIO;  in wait_lpc_idle()
86 	} while (--waitcnt);  in wait_lpc_idle()
88 	return -ETIME;  in wait_lpc_idle()
92  * hisi_lpc_target_in - trigger a series of LPC cycles for read operation
99  * Returns 0 on success, non-zero on fail.
110 	if (!buf || !opcnt || !para || !para->csize || !lpcdev)  in hisi_lpc_target_in()
111 		return -EINVAL;  in hisi_lpc_target_in()
115 	if (!(para->opflags & FG_INCRADDR_LPC)) {  in hisi_lpc_target_in()
121 	spin_lock_irqsave(&lpcdev->cycle_lock, flags);  in hisi_lpc_target_in()
123 	writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);  in hisi_lpc_target_in()
124 	writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);  in hisi_lpc_target_in()
125 	writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);  in hisi_lpc_target_in()
128 	       lpcdev->membase + LPC_REG_STARTUP_SIGNAL);  in hisi_lpc_target_in()
131 	ret = wait_lpc_idle(lpcdev->membase, waitcnt);  in hisi_lpc_target_in()
133 		spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);  in hisi_lpc_target_in()
137 	readsb(lpcdev->membase + LPC_REG_RDATA, buf, opcnt);  in hisi_lpc_target_in()
139 	spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);  in hisi_lpc_target_in()
145  * hisi_lpc_target_out - trigger a series of LPC cycles for write operation
152  * Returns 0 on success, non-zero on fail.
164 		return -EINVAL;  in hisi_lpc_target_out()
169 	if (!(para->opflags & FG_INCRADDR_LPC)) {  in hisi_lpc_target_out()
174 	spin_lock_irqsave(&lpcdev->cycle_lock, flags);  in hisi_lpc_target_out()
176 	writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);  in hisi_lpc_target_out()
177 	writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);  in hisi_lpc_target_out()
178 	writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);  in hisi_lpc_target_out()
180 	writesb(lpcdev->membase + LPC_REG_WDATA, buf, opcnt);  in hisi_lpc_target_out()
183 	       lpcdev->membase + LPC_REG_STARTUP_SIGNAL);  in hisi_lpc_target_out()
186 	ret = wait_lpc_idle(lpcdev->membase, waitcnt);  in hisi_lpc_target_out()
188 	spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);  in hisi_lpc_target_out()
196 	return pio - lpcdev->io_host->io_start + lpcdev->io_host->hw_start;  in hisi_lpc_pio_to_addr()
200  * hisi_lpc_comm_in - input the data in a single operation
232  * hisi_lpc_comm_out - output the data in a single operation
235  * @val: a value to be output from caller, maximum is four bytes
262  * hisi_lpc_comm_ins - input the data in the buffer in multiple operations
270  * Returns 0 on success, -errno otherwise.
281 		return -EINVAL;  in hisi_lpc_comm_ins()
297 	} while (--count);  in hisi_lpc_comm_ins()
303  * hisi_lpc_comm_outs - output the data in the buffer in multiple operations
332 	} while (--count);  in hisi_lpc_comm_outs()
350 	sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len);  in hisi_lpc_acpi_xlat_io_res()
352 		return -EFAULT;  in hisi_lpc_acpi_xlat_io_res()
354 	res->start = sys_port;  in hisi_lpc_acpi_xlat_io_res()
355 	res->end = sys_port + len;  in hisi_lpc_acpi_xlat_io_res()
368 	if (r->end != 0x3fff)  in hisi_lpc_acpi_fixup_child_resource()
371 	if (r->start == 0xe4)  in hisi_lpc_acpi_fixup_child_resource()
372 		r->end = 0xe4 + 0x04 - 1;  in hisi_lpc_acpi_fixup_child_resource()
373 	else if (r->start == 0x2f8)  in hisi_lpc_acpi_fixup_child_resource()
374 		r->end = 0x2f8 + 0x08 - 1;  in hisi_lpc_acpi_fixup_child_resource()
381  * hisi_lpc_acpi_set_io_res - set the resources for a child
390  * host-relative address resource.  This function will return the translated
406 		return -EINVAL;  in hisi_lpc_acpi_set_io_res()
411 	if (!adev->status.present) {  in hisi_lpc_acpi_set_io_res()
413 		return -EIO;  in hisi_lpc_acpi_set_io_res()
418 		return -EIO;  in hisi_lpc_acpi_set_io_res()
429 		return count ? count : -EIO;  in hisi_lpc_acpi_set_io_res()
438 		return -ENOMEM;  in hisi_lpc_acpi_set_io_res()
442 		resources[count] = *rentry->res;  in hisi_lpc_acpi_set_io_res()
488 	list_for_each_entry(child, &adev->children, node)  in hisi_lpc_acpi_remove()
493  * hisi_lpc_acpi_probe - probe children for ACPI FW
509 	list_for_each_entry(child, &adev->children, node) {  in hisi_lpc_acpi_probe()
511 		const struct hisi_lpc_acpi_cell *cell;  in hisi_lpc_acpi_probe()  local
517 		ret = hisi_lpc_acpi_set_io_res(&child->dev, &adev->dev, &res,  in hisi_lpc_acpi_probe()
524 		cell = (struct hisi_lpc_acpi_cell []){  in hisi_lpc_acpi_probe()
528 				.name = "hisi-lpc-ipmi",  in hisi_lpc_acpi_probe()
530 			/* 8250-compatible uart */  in hisi_lpc_acpi_probe()
536 						.iobase = res->start,  in hisi_lpc_acpi_probe()
549 		for (; cell && cell->name; cell++) {  in hisi_lpc_acpi_probe()
550 			if (!strcmp(cell->hid, hid)) {  in hisi_lpc_acpi_probe()
558 				 "could not find cell for child device (%s), discarding\n",  in hisi_lpc_acpi_probe()
563 		pdev = platform_device_alloc(cell->name, PLATFORM_DEVID_AUTO);  in hisi_lpc_acpi_probe()
565 			ret = -ENOMEM;  in hisi_lpc_acpi_probe()
569 		pdev->dev.parent = hostdev;  in hisi_lpc_acpi_probe()
570 		ACPI_COMPANION_SET(&pdev->dev, child);  in hisi_lpc_acpi_probe()
576 		ret = platform_device_add_data(pdev, cell->pdata,  in hisi_lpc_acpi_probe()
577 					       cell->pdata_size);  in hisi_lpc_acpi_probe()
602 	return -ENODEV;  in hisi_lpc_acpi_probe()
611  * hisi_lpc_probe - the probe callback function for hisi lpc host,
615  * Returns 0 on success, non-zero on fail.
619 	struct device *dev = &pdev->dev;  in hisi_lpc_probe()
629 		return -ENOMEM;  in hisi_lpc_probe()
631 	spin_lock_init(&lpcdev->cycle_lock);  in hisi_lpc_probe()
634 	lpcdev->membase = devm_ioremap_resource(dev, res);  in hisi_lpc_probe()
635 	if (IS_ERR(lpcdev->membase))  in hisi_lpc_probe()
636 		return PTR_ERR(lpcdev->membase);  in hisi_lpc_probe()
640 		return -ENOMEM;  in hisi_lpc_probe()
642 	range->fwnode = dev->fwnode;  in hisi_lpc_probe()
643 	range->flags = LOGIC_PIO_INDIRECT;  in hisi_lpc_probe()
644 	range->size = PIO_INDIRECT_SIZE;  in hisi_lpc_probe()
645 	range->hostdata = lpcdev;  in hisi_lpc_probe()
646 	range->ops = &hisi_lpc_ops;  in hisi_lpc_probe()
647 	lpcdev->io_host = range;  in hisi_lpc_probe()
659 		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in hisi_lpc_probe()
667 	io_end = lpcdev->io_host->io_start + lpcdev->io_host->size;  in hisi_lpc_probe()
668 	dev_info(dev, "registered range [%pa - %pa]\n",  in hisi_lpc_probe()
669 		 &lpcdev->io_host->io_start, &io_end);  in hisi_lpc_probe()
676 	struct device *dev = &pdev->dev;  in hisi_lpc_remove()
679 	struct logic_pio_hwaddr *range = lpcdev->io_host;  in hisi_lpc_remove()
692 	{ .compatible = "hisilicon,hip06-lpc", },
693 	{ .compatible = "hisilicon,hip07-lpc", },