[PATCH v2 06/21] ipmi: kcs_bmc_aspeed: Use of match data to extract KCS properties

Andrew Jeffery
2021-03-19T06:29:44Z

Unpack and remove the aspeed_kcs_probe_of_v[12]() functions to aid
rearranging how the private device-driver memory is allocated.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
drivers/char/ipmi/kcs_bmc_aspeed.c | 146 ++++++++++++++---------------
1 file changed, 68 insertions(+), 78 deletions(-)

diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index eefe362f65f0..061f53676206 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/regmap.h>
@@ -63,6 +64,10 @@ struct aspeed_kcs_bmc {
struct regmap *map;
};

+struct aspeed_kcs_of_ops {
+ int (*get_channel)(struct platform_device *pdev);
+ int (*get_io_address)(struct platform_device *pdev);
+};

static u8 aspeed_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
{
@@ -231,13 +236,10 @@ 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)
+static int aspeed_kcs_of_v1_get_channel(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;
@@ -245,105 +247,78 @@ static struct kcs_bmc *aspeed_kcs_probe_of_v1(struct platform_device *pdev)
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);
+ return -EINVAL;
}

- kcs = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
- if (!kcs)
- return ERR_PTR(-ENOMEM);
+ return channel;
+}

- 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);
- }
+static int aspeed_kcs_of_v1_get_io_address(struct platform_device *pdev)
+{
+ u32 slave;
+ int rc;

- rc = of_property_read_u32(np, "kcs_addr", &slave);
- if (rc) {
+ rc = of_property_read_u32(pdev->dev.of_node, "kcs_addr", &slave);
+ if (rc || slave > 0xffff) {
dev_err(&pdev->dev, "no valid 'kcs_addr' configured\n");
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

- kcs->ioreg = ast_kcs_bmc_ioregs[channel - 1];
- aspeed_kcs_set_address(kcs, slave);
-
- return kcs;
-}
-
-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;
+ return slave;
}

-static struct kcs_bmc *aspeed_kcs_probe_of_v2(struct platform_device *pdev)
+static int aspeed_kcs_of_v2_get_channel(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;
+ int i;

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);
+ return -EINVAL;
ioreg.idr = be32_to_cpup(reg);

reg = of_get_address(np, 1, NULL, NULL);
if (!reg)
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
ioreg.odr = be32_to_cpup(reg);

reg = of_get_address(np, 2, NULL, NULL);
if (!reg)
- return ERR_PTR(-EINVAL);
+ return -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);
+ for (i = 0; i < ARRAY_SIZE(ast_kcs_bmc_ioregs); i++) {
+ if (!memcmp(&ast_kcs_bmc_ioregs[i], &ioreg, sizeof(ioreg)))
+ return i + 1;
}

- rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &slave);
- if (rc)
- return ERR_PTR(rc);
+ return -EINVAL;
+}

- aspeed_kcs_set_address(kcs, slave);
+static int aspeed_kcs_of_v2_get_io_address(struct platform_device *pdev)
+{
+ uint32_t slave;
+ int rc;

- return kcs;
+ rc = of_property_read_u32(pdev->dev.of_node, "aspeed,lpc-io-reg", &slave);
+ if (rc || slave > 0xffff)
+ return -EINVAL;
+
+ return slave;
}

static int aspeed_kcs_probe(struct platform_device *pdev)
{
+ const struct aspeed_kcs_of_ops *ops;
struct device *dev = &pdev->dev;
struct kcs_bmc *kcs_bmc;
struct device_node *np;
- int rc;
+ int rc, channel, addr;

np = dev->of_node->parent;
if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
@@ -352,23 +327,28 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
dev_err(dev, "unsupported LPC device binding\n");
return -ENODEV;
}
-
- np = 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
+ ops = of_device_get_match_data(&pdev->dev);
+ if (!ops)
return -EINVAL;

- if (IS_ERR(kcs_bmc))
- return PTR_ERR(kcs_bmc);
+ channel = ops->get_channel(pdev);
+ if (channel < 0)
+ return channel;

+ kcs_bmc = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
+ if (!kcs_bmc)
+ return -ENOMEM;
+
+ kcs_bmc->ioreg = ast_kcs_bmc_ioregs[channel - 1];
kcs_bmc->io_inputb = aspeed_kcs_inb;
kcs_bmc->io_outputb = aspeed_kcs_outb;

+ addr = ops->get_io_address(pdev);
+ if (addr < 0)
+ return addr;
+
+ aspeed_kcs_set_address(kcs_bmc, addr);
+
rc = aspeed_kcs_config_irq(kcs_bmc, pdev);
if (rc)
return rc;
@@ -400,11 +380,21 @@ static int aspeed_kcs_remove(struct platform_device *pdev)
return 0;
}

+static const struct aspeed_kcs_of_ops of_v1_ops = {
+ .get_channel = aspeed_kcs_of_v1_get_channel,
+ .get_io_address = aspeed_kcs_of_v1_get_io_address,
+};
+
+static const struct aspeed_kcs_of_ops of_v2_ops = {
+ .get_channel = aspeed_kcs_of_v2_get_channel,
+ .get_io_address = aspeed_kcs_of_v2_get_io_address,
+};
+
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" },
+ { .compatible = "aspeed,ast2400-kcs-bmc", .data = &of_v1_ops },
+ { .compatible = "aspeed,ast2500-kcs-bmc", .data = &of_v1_ops },
+ { .compatible = "aspeed,ast2400-kcs-bmc-v2", .data = &of_v2_ops },
+ { .compatible = "aspeed,ast2500-kcs-bmc-v2", .data = &of_v2_ops },
{ }
};
MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match);
--
2.27.0