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ipmi: kcs: aspeed: Implement v2 bindings

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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.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Haiyue Wang <haiyue.wang@linux.intel.com>
Message-Id: <01ef3787e9ddaa9d87cfd55a2ac793053b5a69de.1576462051.git-series.andrew@aj.id.au>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Andrew Jeffery 2019-12-16 12:57:42 +10:30 committed by Corey Minyard
parent af6432c76a
commit 09f5f68070
1 changed files with 126 additions and 28 deletions
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154
drivers/char/ipmi/kcs_bmc_aspeed.c
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@ -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, "aspeed,lpc-io-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;
rc = of_property_read_u32(dev->of_node, "kcs_addr", &addr);
if (rc) {
dev_err(dev, "no valid 'kcs_addr' configured\n");
return -ENODEV;
}
if (IS_ERR(kcs_bmc))
return PTR_ERR(kcs_bmc);
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);