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 -ETIMEDOUT;  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(acpi_fwnode_handle(host), 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
397 	struct acpi_device *host = to_acpi_device(adev->dev.parent);  in hisi_lpc_acpi_set_io_res()
404 	if (!adev->status.present) {  in hisi_lpc_acpi_set_io_res()
405 		dev_dbg(&adev->dev, "device is not present\n");  in hisi_lpc_acpi_set_io_res()
406 		return -EIO;  in hisi_lpc_acpi_set_io_res()
410 		dev_dbg(&adev->dev, "has been enumerated\n");  in hisi_lpc_acpi_set_io_res()
411 		return -EIO;  in hisi_lpc_acpi_set_io_res()
421 		dev_dbg(&adev->dev, "failed to get resources\n");  in hisi_lpc_acpi_set_io_res()
422 		return count ? count : -EIO;  in hisi_lpc_acpi_set_io_res()
431 		return -ENOMEM;  in hisi_lpc_acpi_set_io_res()
435 		resources[count] = *rentry->res;  in hisi_lpc_acpi_set_io_res()
450 			dev_err(&adev->dev, "translate IO range %pR failed (%d)\n",  in hisi_lpc_acpi_set_io_res()
489 	const struct hisi_lpc_acpi_cell *cell;  in hisi_lpc_acpi_add_child()  local
502 	cell = (struct hisi_lpc_acpi_cell []){  in hisi_lpc_acpi_add_child()
510 					.name = "hisi-lpc-ipmi",  in hisi_lpc_acpi_add_child()
517 		/* 8250-compatible uart */  in hisi_lpc_acpi_add_child()
530 							.iobase = res->start,  in hisi_lpc_acpi_add_child()
544 	for (; cell && cell->hid; cell++) {  in hisi_lpc_acpi_add_child()
545 		if (!strcmp(cell->hid, hid)) {  in hisi_lpc_acpi_add_child()
553 			 "could not find cell for child device (%s), discarding\n",  in hisi_lpc_acpi_add_child()
558 	pdev = platform_device_register_full(cell->pdevinfo);  in hisi_lpc_acpi_add_child()
567  * hisi_lpc_acpi_probe - probe children for ACPI FW
591 	return -ENODEV;  in hisi_lpc_acpi_probe()
600  * hisi_lpc_probe - the probe callback function for hisi lpc host,
604  * Returns 0 on success, non-zero on fail.
608 	struct device *dev = &pdev->dev;  in hisi_lpc_probe()
616 		return -ENOMEM;  in hisi_lpc_probe()
618 	spin_lock_init(&lpcdev->cycle_lock);  in hisi_lpc_probe()
620 	lpcdev->membase = devm_platform_ioremap_resource(pdev, 0);  in hisi_lpc_probe()
621 	if (IS_ERR(lpcdev->membase))  in hisi_lpc_probe()
622 		return PTR_ERR(lpcdev->membase);  in hisi_lpc_probe()
626 		return -ENOMEM;  in hisi_lpc_probe()
628 	range->fwnode = dev_fwnode(dev);  in hisi_lpc_probe()
629 	range->flags = LOGIC_PIO_INDIRECT;  in hisi_lpc_probe()
630 	range->size = PIO_INDIRECT_SIZE;  in hisi_lpc_probe()
631 	range->hostdata = lpcdev;  in hisi_lpc_probe()
632 	range->ops = &hisi_lpc_ops;  in hisi_lpc_probe()
633 	lpcdev->io_host = range;  in hisi_lpc_probe()
642 	if (is_acpi_device_node(range->fwnode))  in hisi_lpc_probe()
645 		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);  in hisi_lpc_probe()
653 	io_end = lpcdev->io_host->io_start + lpcdev->io_host->size;  in hisi_lpc_probe()
654 	dev_info(dev, "registered range [%pa - %pa]\n",  in hisi_lpc_probe()
655 		 &lpcdev->io_host->io_start, &io_end);  in hisi_lpc_probe()
662 	struct device *dev = &pdev->dev;  in hisi_lpc_remove()
664 	struct logic_pio_hwaddr *range = lpcdev->io_host;  in hisi_lpc_remove()
666 	if (is_acpi_device_node(range->fwnode))  in hisi_lpc_remove()
675 	{ .compatible = "hisilicon,hip06-lpc", },
676 	{ .compatible = "hisilicon,hip07-lpc", },