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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/ipmi/kcs_bmc_aspeed.c
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@@ -12,6 +12,7 @@
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 #include <linux/mfd/syscon.h>
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 #include <linux/module.h>
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 #include <linux/of.h>
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+#include <linux/of_address.h>
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 #include <linux/platform_device.h>
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 #include <linux/poll.h>
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 #include <linux/regmap.h>
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@@ -233,48 +234,143 @@
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 	{ .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 },
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 };
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+static struct kcs_bmc *aspeed_kcs_probe_of_v1(struct platform_device *pdev)
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+{
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+	struct aspeed_kcs_bmc *priv;
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+	struct device_node *np;
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+	struct kcs_bmc *kcs;
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+	u32 channel;
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+	u32 slave;
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+	int rc;
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+
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+	np = pdev->dev.of_node;
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+
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+	rc = of_property_read_u32(np, "kcs_chan", &channel);
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+	if ((rc != 0) || (channel == 0 || channel > KCS_CHANNEL_MAX)) {
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+		dev_err(&pdev->dev, "no valid 'kcs_chan' configured\n");
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+		return ERR_PTR(-EINVAL);
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+	}
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+
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+	kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
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+	if (!kcs)
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+		return ERR_PTR(-ENOMEM);
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+
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+	priv = kcs_bmc_priv(kcs);
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+	priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
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+	if (IS_ERR(priv->map)) {
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+		dev_err(&pdev->dev, "Couldn't get regmap\n");
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+		return ERR_PTR(-ENODEV);
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+	}
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+
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+	rc = of_property_read_u32(np, "kcs_addr", &slave);
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+	if (rc) {
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+		dev_err(&pdev->dev, "no valid 'kcs_addr' configured\n");
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+		return ERR_PTR(-EINVAL);
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+	}
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+
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+	kcs->ioreg = ast_kcs_bmc_ioregs[channel - 1];
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+	aspeed_kcs_set_address(kcs, slave);
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+
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+	return kcs;
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+}
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+
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+static int aspeed_kcs_calculate_channel(const struct kcs_ioreg *regs)
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+{
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+	int i;
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+
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+	for (i = 0; i < ARRAY_SIZE(ast_kcs_bmc_ioregs); i++) {
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+		if (!memcmp(&ast_kcs_bmc_ioregs[i], regs, sizeof(*regs)))
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+			return i + 1;
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+	}
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+
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+	return -EINVAL;
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+}
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+
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+static struct kcs_bmc *aspeed_kcs_probe_of_v2(struct platform_device *pdev)
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+{
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+	struct aspeed_kcs_bmc *priv;
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+	struct device_node *np;
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+	struct kcs_ioreg ioreg;
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+	struct kcs_bmc *kcs;
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+	const __be32 *reg;
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+	int channel;
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+	u32 slave;
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+	int rc;
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+
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+	np = pdev->dev.of_node;
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+
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+	/* Don't translate addresses, we want offsets for the regmaps */
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+	reg = of_get_address(np, 0, NULL, NULL);
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+	if (!reg)
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+		return ERR_PTR(-EINVAL);
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+	ioreg.idr = be32_to_cpup(reg);
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+
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+	reg = of_get_address(np, 1, NULL, NULL);
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+	if (!reg)
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+		return ERR_PTR(-EINVAL);
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+	ioreg.odr = be32_to_cpup(reg);
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+
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+	reg = of_get_address(np, 2, NULL, NULL);
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+	if (!reg)
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+		return ERR_PTR(-EINVAL);
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+	ioreg.str = be32_to_cpup(reg);
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+
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+	channel = aspeed_kcs_calculate_channel(&ioreg);
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+	if (channel < 0)
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+		return ERR_PTR(channel);
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+
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+	kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
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+	if (!kcs)
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+		return ERR_PTR(-ENOMEM);
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+
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+	kcs->ioreg = ioreg;
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+
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+	priv = kcs_bmc_priv(kcs);
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+	priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
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+	if (IS_ERR(priv->map)) {
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+		dev_err(&pdev->dev, "Couldn't get regmap\n");
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+		return ERR_PTR(-ENODEV);
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+	}
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+
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+	rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &slave);
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+	if (rc)
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+		return ERR_PTR(rc);
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+
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+	aspeed_kcs_set_address(kcs, slave);
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+
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+	return kcs;
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+}
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+
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 static int aspeed_kcs_probe(struct platform_device *pdev)
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 {
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 	struct device *dev = &pdev->dev;
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-	struct aspeed_kcs_bmc *priv;
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 	struct kcs_bmc *kcs_bmc;
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-	u32 chan, addr;
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+	struct device_node *np;
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 	int rc;
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-	rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan);
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-	if ((rc != 0) || (chan == 0 || chan > KCS_CHANNEL_MAX)) {
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-		dev_err(dev, "no valid 'kcs_chan' configured\n");
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-		return -ENODEV;
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-	}
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+	np = pdev->dev.of_node;
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+	if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc") ||
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+			of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc"))
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+		kcs_bmc = aspeed_kcs_probe_of_v1(pdev);
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+	else if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc-v2") ||
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+			of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc-v2"))
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+		kcs_bmc = aspeed_kcs_probe_of_v2(pdev);
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+	else
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+		return -EINVAL;
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-	rc = of_property_read_u32(dev->of_node, "kcs_addr", &addr);
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-	if (rc) {
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-		dev_err(dev, "no valid 'kcs_addr' configured\n");
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-		return -ENODEV;
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-	}
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+	if (IS_ERR(kcs_bmc))
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+		return PTR_ERR(kcs_bmc);
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363
 
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-	kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan);
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-	if (!kcs_bmc)
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-		return -ENOMEM;
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-
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-	priv = kcs_bmc_priv(kcs_bmc);
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-	priv->map = syscon_node_to_regmap(dev->parent->of_node);
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-	if (IS_ERR(priv->map)) {
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-		dev_err(dev, "Couldn't get regmap\n");
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-		return -ENODEV;
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-	}
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-
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-	kcs_bmc->ioreg = ast_kcs_bmc_ioregs[chan - 1];
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 	kcs_bmc->io_inputb = aspeed_kcs_inb;
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 	kcs_bmc->io_outputb = aspeed_kcs_outb;
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-	dev_set_drvdata(dev, kcs_bmc);
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-
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-	aspeed_kcs_set_address(kcs_bmc, addr);
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-	aspeed_kcs_enable_channel(kcs_bmc, true);
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 	rc = aspeed_kcs_config_irq(kcs_bmc, pdev);
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 	if (rc)
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 		return rc;
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+
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+	dev_set_drvdata(dev, kcs_bmc);
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+
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+	aspeed_kcs_enable_channel(kcs_bmc, true);
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 	rc = misc_register(&kcs_bmc->miscdev);
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 	if (rc) {
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@@ -282,9 +378,10 @@
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 		return rc;
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 	}
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-	pr_info("channel=%u addr=0x%x idr=0x%x odr=0x%x str=0x%x\n",
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-		chan, addr,
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-		kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, kcs_bmc->ioreg.str);
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+	dev_dbg(&pdev->dev,
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+		"Probed KCS device %d (IDR=0x%x, ODR=0x%x, STR=0x%x)\n",
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+		kcs_bmc->channel, kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr,
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+		kcs_bmc->ioreg.str);
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 	return 0;
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 }
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@@ -301,6 +398,8 @@
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 static const struct of_device_id ast_kcs_bmc_match[] = {
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 	{ .compatible = "aspeed,ast2400-kcs-bmc" },
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 	{ .compatible = "aspeed,ast2500-kcs-bmc" },
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+	{ .compatible = "aspeed,ast2400-kcs-bmc-v2" },
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+	{ .compatible = "aspeed,ast2500-kcs-bmc-v2" },
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 	{ }
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 };
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 MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match);