[PATCH] BMC support for PARISC machines

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

The last line of PARISC machines (C8000, RP34x0, etc.) have a BMC for
controlling temperature, fan speed and other stuff. The BMC is connected
via a special bus and listed in the firmware device tree. This change
adds support for these BMCs to the IPMI driver.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

 drivers/char/ipmi/ipmi_si_intf.c |   78 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 035da9e..1599a45 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -71,6 +71,11 @@
 #include <linux/of_platform.h>
 #endif
 
+#ifdef CONFIG_PARISC
+#include <asm/hardware.h>	/* for register_parisc_driver() stuff */
+#include <asm/parisc-device.h>
+#endif
+
 #define PFX "ipmi_si: "
 
 /* Measure times between events in the driver. */
@@ -311,6 +316,9 @@ static int pnp_registered;
 #ifdef CONFIG_PPC_OF
 static int of_registered;
 #endif
+#ifdef CONFIG_PARISC
+static int parisc_registered;
+#endif
 
 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
 static int num_max_busy_us;
@@ -2648,6 +2656,64 @@ static struct of_platform_driver ipmi_of_platform_driver = {
 };
 #endif /* CONFIG_PPC_OF */
 
+#ifdef CONFIG_PARISC
+static int __devinit ipmi_parisc_probe(struct parisc_device *dev)
+{
+	struct smi_info *info;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+
+	if (!info) {
+		dev_err(&dev->dev,
+			"could not allocate memory for PARISC probe\n");
+		return -ENOMEM;
+	}
+
+	info->si_type		= SI_KCS;
+	info->addr_source	= SI_DEVICETREE;
+	info->io_setup		= mem_setup;
+	info->io.addr_type	= IPMI_MEM_ADDR_SPACE;
+	info->io.addr_data	= dev->hpa.start;
+	info->io.regsize	= 1;
+	info->io.regspacing	= 1;
+	info->io.regshift	= 0;
+	info->irq		= 0; /* no interrup */
+	info->irq_setup		= NULL;
+	info->dev		= &dev->dev;
+
+	dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
+		info->io.addr_data, info->io.regsize, info->io.regspacing,
+		info->irq);
+
+	dev_set_drvdata(&dev->dev, info);
+
+	if (add_smi(info)) {
+		kfree(info);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int __devexit ipmi_parisc_remove(struct parisc_device *dev)
+{
+	cleanup_one_si(dev_get_drvdata(&dev->dev));
+	return 0;
+}
+
+static struct parisc_device_id ipmi_parisc_tbl[] = {
+	{ HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
+	{ 0, }
+};
+
+static struct parisc_driver ipmi_parisc_driver = {
+	.name =		"ipmi",
+	.id_table =	ipmi_parisc_tbl,
+	.probe =	ipmi_parisc_probe,
+	.remove =	ipmi_parisc_remove,
+};
+#endif /* CONFIG_PARISC */
+
 static int wait_for_msg_done(struct smi_info *smi_info)
 {
 	enum si_sm_result     smi_result;
@@ -3385,6 +3451,13 @@ static int __devinit init_ipmi_si(void)
 	of_registered = 1;
 #endif
 
+#ifdef CONFIG_PARISC
+	register_parisc_driver(&ipmi_parisc_driver);
+	parisc_registered = 1;
+	/* poking PC IO addresses will crash machine, don't do it */
+	si_trydefaults = 0;
+#endif
+
 	/* We prefer devices with interrupts, but in the case of a machine
 	   with multiple BMCs we assume that there will be several instances
 	   of a given type so if we succeed in registering a type then also
@@ -3444,6 +3517,11 @@ static int __devinit init_ipmi_si(void)
 		if (of_registered)
 			of_unregister_platform_driver(&ipmi_of_platform_driver);
 #endif
+
+#ifdef CONFIG_PARISC
+		if (parisc_registered)
+			unregister_parisc_driver(&ipmi_parisc_driver);
+#endif
 		driver_unregister(&ipmi_driver.driver);
 		printk(KERN_WARNING PFX
 		       "Unable to find any System Interface(s)\n");