The v2 bindings allow us to extract the resources from the devicetree.
The table in the driver is retained to derive the channel index, which
removes the need for kcs_chan property from the v1 bindings. The v2
bindings allow us to reduce the number of warnings generated by the
existing devicetree nodes.
Cc: Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>
Cc: Corey Minyard <minyard@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: openipmi-developer@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
---
drivers/char/ipmi/kcs_bmc_aspeed.c | 156 +++++++++++++++++++++++------
1 file changed, 127 insertions(+), 29 deletions(-)
diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index e3dd09022589..509e0d3c6eb1 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -12,6 +12,7 @@
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/regmap.h>
@@ -233,38 +234,133 @@ static const struct kcs_ioreg ast_kcs_bmc_ioregs[KCS_CHANNEL_MAX] = {
{ .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 },
};
+static struct kcs_bmc *aspeed_kcs_probe_of_v1(struct platform_device *pdev)
+{
+ struct aspeed_kcs_bmc *priv;
+ struct device_node *np;
+ struct kcs_bmc *kcs;
+ u32 channel;
+ u32 slave;
+ int rc;
+
+ np = pdev->dev.of_node;
+
+ rc = of_property_read_u32(np, "kcs_chan", &channel);
+ if ((rc != 0) || (channel == 0 || channel > KCS_CHANNEL_MAX)) {
+ dev_err(&pdev->dev, "no valid 'kcs_chan' configured\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
+ if (!kcs)
+ return ERR_PTR(-ENOMEM);
+
+ priv = kcs_bmc_priv(kcs);
+ priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+ if (IS_ERR(priv->map)) {
+ dev_err(&pdev->dev, "Couldn't get regmap\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ rc = of_property_read_u32(np, "kcs_addr", &slave);
+ if (rc) {
+ dev_err(&pdev->dev, "no valid 'kcs_addr' configured\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ kcs->ioreg = ast_kcs_bmc_ioregs[channel - 1];
+ aspeed_kcs_set_address(kcs, slave);
+
+ return 0;
+}
+
+static int aspeed_kcs_calculate_channel(const struct kcs_ioreg *regs)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ast_kcs_bmc_ioregs); i++) {
+ if (!memcmp(&ast_kcs_bmc_ioregs[i], regs, sizeof(*regs)))
+ return i + 1;
+ }
+
+ return -EINVAL;
+}
+
+static struct kcs_bmc *aspeed_kcs_probe_of_v2(struct platform_device *pdev)
+{
+ struct aspeed_kcs_bmc *priv;
+ struct device_node *np;
+ struct kcs_ioreg ioreg;
+ struct kcs_bmc *kcs;
+ const __be32 *reg;
+ int channel;
+ u32 slave;
+ int rc;
+
+ np = pdev->dev.of_node;
+
+ /* Don't translate addresses, we want offsets for the regmaps */
+ reg = of_get_address(np, 0, NULL, NULL);
+ if (!reg)
+ return ERR_PTR(-EINVAL);
+ ioreg.idr = be32_to_cpup(reg);
+
+ reg = of_get_address(np, 1, NULL, NULL);
+ if (!reg)
+ return ERR_PTR(-EINVAL);
+ ioreg.odr = be32_to_cpup(reg);
+
+ reg = of_get_address(np, 2, NULL, NULL);
+ if (!reg)
+ return ERR_PTR(-EINVAL);
+ ioreg.str = be32_to_cpup(reg);
+
+ channel = aspeed_kcs_calculate_channel(&ioreg);
+ if (channel < 0)
+ return ERR_PTR(channel);
+
+ kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
+ if (!kcs)
+ return ERR_PTR(-ENOMEM);
+
+ kcs->ioreg = ioreg;
+
+ priv = kcs_bmc_priv(kcs);
+ priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+ if (IS_ERR(priv->map)) {
+ dev_err(&pdev->dev, "Couldn't get regmap\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ rc = of_property_read_u32(np, "slave-reg", &slave);
+ if (rc)
+ return ERR_PTR(rc);
+
+ aspeed_kcs_set_address(kcs, slave);
+
+ return kcs;
+}
+
static int aspeed_kcs_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct aspeed_kcs_bmc *priv;
struct kcs_bmc *kcs_bmc;
- u32 chan, addr;
+ struct device_node *np;
int rc;
- rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan);
- if ((rc != 0) || (chan == 0 || chan > KCS_CHANNEL_MAX)) {
- dev_err(dev, "no valid 'kcs_chan' configured\n");
- return -ENODEV;
- }
+ np = pdev->dev.of_node;
+ if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc") ||
+ of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc"))
+ kcs_bmc = aspeed_kcs_probe_of_v1(pdev);
+ else if (of_device_is_compatible(np, "aspeed,ast2400-kcs-bmc-v2") ||
+ of_device_is_compatible(np, "aspeed,ast2500-kcs-bmc-v2"))
+ kcs_bmc = aspeed_kcs_probe_of_v2(pdev);
+ else
+ return -EINVAL;
+
+ if (IS_ERR(kcs_bmc))
+ return PTR_ERR(kcs_bmc);
- rc = of_property_read_u32(dev->of_node, "kcs_addr", &addr);
- if (rc) {
- dev_err(dev, "no valid 'kcs_addr' configured\n");
- return -ENODEV;
- }
-
- kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan);
- if (!kcs_bmc)
- return -ENOMEM;
-
- priv = kcs_bmc_priv(kcs_bmc);
- priv->map = syscon_node_to_regmap(dev->parent->of_node);
- if (IS_ERR(priv->map)) {
- dev_err(dev, "Couldn't get regmap\n");
- return -ENODEV;
- }
-
- kcs_bmc->ioreg = ast_kcs_bmc_ioregs[chan - 1];
kcs_bmc->io_inputb = aspeed_kcs_inb;
kcs_bmc->io_outputb = aspeed_kcs_outb;
@@ -274,7 +370,6 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
dev_set_drvdata(dev, kcs_bmc);
- aspeed_kcs_set_address(kcs_bmc, addr);
aspeed_kcs_enable_channel(kcs_bmc, true);
rc = misc_register(&kcs_bmc->miscdev);
@@ -283,9 +378,10 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
return rc;
}
- pr_info("channel=%u addr=0x%x idr=0x%x odr=0x%x str=0x%x\n",
- chan, addr,
- kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, kcs_bmc->ioreg.str);
+ dev_dbg(&pdev->dev,
+ "Probed KCS device %d (IDR=0x%x, ODR=0x%x, STR=0x%x)\n",
+ kcs_bmc->channel, kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr,
+ kcs_bmc->ioreg.str);
return 0;
}
@@ -302,6 +398,8 @@ static int aspeed_kcs_remove(struct platform_device *pdev)
static const struct of_device_id ast_kcs_bmc_match[] = {
{ .compatible = "aspeed,ast2400-kcs-bmc" },
{ .compatible = "aspeed,ast2500-kcs-bmc" },
+ { .compatible = "aspeed,ast2400-kcs-bmc-v2" },
+ { .compatible = "aspeed,ast2500-kcs-bmc-v2" },
{ }
};
MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match);
--
2.20.1
