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ipmi: bt-bmc: Use a regmap for register access 

The registers for the bt-bmc device live under the Aspeed LPC
controller. Devicetree bindings have recently been introduced for the
LPC controller where the "host" portion of the LPC register space is
described as a syscon device. Future devicetrees describing the bt-bmc
device should nest its node under the appropriate "simple-mfd", "syscon"
compatible node.

This change allows the bt-bmc driver to function with both syscon and
non-syscon- based devicetree descriptions by always using a regmap for
register access, either retrieved from the parent syscon device or
instantiated if none exists.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Andrew Jeffery 2017-02-21 01:53:00 +10:30 committed by Corey Minyard
parent db3b7e1341
commit eb994594bc
2 changed files with 61 additions and 22 deletions
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3
drivers/char/ipmi/Kconfig
View File

@ -78,7 +78,8 @@ config IPMI_POWEROFF
endif # IPMI_HANDLER
config ASPEED_BT_IPMI_BMC
depends on ARCH_ASPEED
depends on ARCH_ASPEED || COMPILE_TEST
depends on REGMAP && REGMAP_MMIO && MFD_SYSCON
tristate "BT IPMI bmc driver"
help
Provides a driver for the BT (Block Transfer) IPMI interface

80
drivers/char/ipmi/bt-bmc.c
View File

@ -12,10 +12,13 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/timer.h>
@ -60,7 +63,8 @@
struct bt_bmc {
struct device dev;
struct miscdevice miscdev;
void __iomem *base;
struct regmap *map;
int offset;
int irq;
wait_queue_head_t queue;
struct timer_list poll_timer;
@ -69,14 +73,29 @@ struct bt_bmc {
static atomic_t open_count = ATOMIC_INIT(0);
static const struct regmap_config bt_regmap_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)
{
return ioread8(bt_bmc->base + reg);
uint32_t val = 0;
int rc;
rc = regmap_read(bt_bmc->map, bt_bmc->offset + reg, &val);
WARN(rc != 0, "regmap_read() failed: %d\n", rc);
return rc == 0 ? (u8) val : 0;
}
static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)
{
iowrite8(data, bt_bmc->base + reg);
int rc;
rc = regmap_write(bt_bmc->map, bt_bmc->offset + reg, data);
WARN(rc != 0, "regmap_write() failed: %d\n", rc);
}
static void clr_rd_ptr(struct bt_bmc *bt_bmc)
@ -367,14 +386,18 @@ static irqreturn_t bt_bmc_irq(int irq, void *arg)
{
struct bt_bmc *bt_bmc = arg;
u32 reg;
int rc;
rc = regmap_read(bt_bmc->map, bt_bmc->offset + BT_CR2, &reg);
if (rc)
return IRQ_NONE;
reg = ioread32(bt_bmc->base + BT_CR2);
reg &= BT_CR2_IRQ_H2B | BT_CR2_IRQ_HBUSY;
if (!reg)
return IRQ_NONE;
/* ack pending IRQs */
iowrite32(reg, bt_bmc->base + BT_CR2);
regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR2, reg);
wake_up(&bt_bmc->queue);
return IRQ_HANDLED;
@ -384,7 +407,6 @@ static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
u32 reg;
int rc;
bt_bmc->irq = platform_get_irq(pdev, 0);
@ -405,18 +427,17 @@ static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
* will be cleared (along with B2H) when we can write the next
* message to the BT buffer
*/
reg = ioread32(bt_bmc->base + BT_CR1);
reg |= BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY;
iowrite32(reg, bt_bmc->base + BT_CR1);
rc = regmap_update_bits(bt_bmc->map, bt_bmc->offset + BT_CR1,
(BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY),
(BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY));
return 0;
return rc;
}
static int bt_bmc_probe(struct platform_device *pdev)
{
struct bt_bmc *bt_bmc;
struct device *dev;
struct resource *res;
int rc;
if (!pdev || !pdev->dev.of_node)
@ -431,10 +452,27 @@ static int bt_bmc_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, bt_bmc);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bt_bmc->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(bt_bmc->base))
return PTR_ERR(bt_bmc->base);
bt_bmc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(bt_bmc->map)) {
struct resource *res;
void __iomem *base;
/*
* Assume it's not the MFD-based devicetree description, in
* which case generate a regmap ourselves
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
bt_bmc->map = devm_regmap_init_mmio(dev, base, &bt_regmap_cfg);
bt_bmc->offset = 0;
} else {
rc = of_property_read_u32(dev->of_node, "reg", &bt_bmc->offset);
if (rc)
return rc;
}
mutex_init(&bt_bmc->mutex);
init_waitqueue_head(&bt_bmc->queue);
@ -461,12 +499,12 @@ static int bt_bmc_probe(struct platform_device *pdev)
add_timer(&bt_bmc->poll_timer);
}
iowrite32((BT_IO_BASE << BT_CR0_IO_BASE) |
(BT_IRQ << BT_CR0_IRQ) |
BT_CR0_EN_CLR_SLV_RDP |
BT_CR0_EN_CLR_SLV_WRP |
BT_CR0_ENABLE_IBT,
bt_bmc->base + BT_CR0);
regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR0,
(BT_IO_BASE << BT_CR0_IO_BASE) |
(BT_IRQ << BT_CR0_IRQ) |
BT_CR0_EN_CLR_SLV_RDP |
BT_CR0_EN_CLR_SLV_WRP |
BT_CR0_ENABLE_IBT);
clr_b_busy(bt_bmc);