--- /dev/null
+/*
+ * A hack to create a platform device from a DMI entry. This will
+ * allow autoloading of the IPMI drive based on SMBIOS entries.
+ */
+
+#include <linux/ipmi.h>
+#include <linux/init.h>
+#include <linux/dmi.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include "ipmi_dmi.h"
+
+struct ipmi_dmi_info {
+ int type;
+ u32 flags;
+ unsigned long addr;
+ u8 slave_addr;
+ struct ipmi_dmi_info *next;
+};
+
+static struct ipmi_dmi_info *ipmi_dmi_infos;
+
+static int ipmi_dmi_nr __initdata;
+
+static void __init dmi_add_platform_ipmi(unsigned long base_addr,
+ u32 flags,
+ u8 slave_addr,
+ int irq,
+ int offset,
+ int type)
+{
+ struct platform_device *pdev;
+ struct resource r[4];
+ unsigned int num_r = 1, size;
+ struct property_entry p[4] = {
+ PROPERTY_ENTRY_U8("slave-addr", slave_addr),
+ PROPERTY_ENTRY_U8("ipmi-type", type),
+ PROPERTY_ENTRY_U16("i2c-addr", base_addr),
+ { }
+ };
+ char *name, *override;
+ int rv;
+ struct ipmi_dmi_info *info;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ pr_warn("ipmi:dmi: Could not allocate dmi info\n");
+ } else {
+ info->type = type;
+ info->flags = flags;
+ info->addr = base_addr;
+ info->slave_addr = slave_addr;
+ info->next = ipmi_dmi_infos;
+ ipmi_dmi_infos = info;
+ }
+
+ name = "dmi-ipmi-si";
+ override = "ipmi_si";
+ switch (type) {
+ case IPMI_DMI_TYPE_SSIF:
+ name = "dmi-ipmi-ssif";
+ override = "ipmi_ssif";
+ offset = 1;
+ size = 1;
+ break;
+ case IPMI_DMI_TYPE_BT:
+ size = 3;
+ break;
+ case IPMI_DMI_TYPE_KCS:
+ case IPMI_DMI_TYPE_SMIC:
+ size = 2;
+ break;
+ default:
+ pr_err("ipmi:dmi: Invalid IPMI type: %d", type);
+ return;
+ }
+
+ pdev = platform_device_alloc(name, ipmi_dmi_nr);
+ if (!pdev) {
+ pr_err("ipmi:dmi: Error allocation IPMI platform device");
+ return;
+ }
+ pdev->driver_override = override;
+
+ if (type == IPMI_DMI_TYPE_SSIF)
+ goto add_properties;
+
+ memset(r, 0, sizeof(r));
+
+ r[0].start = base_addr;
+ r[0].end = r[0].start + offset - 1;
+ r[0].name = "IPMI Address 1";
+ r[0].flags = flags;
+
+ if (size > 1) {
+ r[1].start = r[0].start + offset;
+ r[1].end = r[1].start + offset - 1;
+ r[1].name = "IPMI Address 2";
+ r[1].flags = flags;
+ num_r++;
+ }
+
+ if (size > 2) {
+ r[2].start = r[1].start + offset;
+ r[2].end = r[2].start + offset - 1;
+ r[2].name = "IPMI Address 3";
+ r[2].flags = flags;
+ num_r++;
+ }
+
+ if (irq) {
+ r[num_r].start = irq;
+ r[num_r].end = irq;
+ r[num_r].name = "IPMI IRQ";
+ r[num_r].flags = IORESOURCE_IRQ;
+ num_r++;
+ }
+
+ rv = platform_device_add_resources(pdev, r, num_r);
+ if (rv) {
+ dev_err(&pdev->dev,
+ "ipmi:dmi: Unable to add resources: %d\n", rv);
+ goto err;
+ }
+
+add_properties:
+ rv = platform_device_add_properties(pdev, p);
+ if (rv) {
+ dev_err(&pdev->dev,
+ "ipmi:dmi: Unable to add properties: %d\n", rv);
+ goto err;
+ }
+
+ rv = platform_device_add(pdev);
+ if (rv) {
+ dev_err(&pdev->dev, "ipmi:dmi: Unable to add device: %d\n", rv);
+ goto err;
+ }
+
+ ipmi_dmi_nr++;
+ return;
+
+err:
+ platform_device_put(pdev);
+}
+
+/*
+ * Look up the slave address for a given interface. This is here
+ * because ACPI doesn't have a slave address while SMBIOS does, but we
+ * prefer using ACPI so the ACPI code can use the IPMI namespace.
+ * This function allows an ACPI-specified IPMI device to look up the
+ * slave address from the DMI table.
+ */
+int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr)
+{
+ struct ipmi_dmi_info *info = ipmi_dmi_infos;
+
+ while (info) {
+ if (info->type == type &&
+ info->flags == flags &&
+ info->addr == base_addr)
+ return info->slave_addr;
+ info = info->next;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(ipmi_dmi_get_slave_addr);
+
+#define DMI_IPMI_MIN_LENGTH 0x10
+#define DMI_IPMI_VER2_LENGTH 0x12
+#define DMI_IPMI_TYPE 4
+#define DMI_IPMI_SLAVEADDR 6
+#define DMI_IPMI_ADDR 8
+#define DMI_IPMI_ACCESS 0x10
+#define DMI_IPMI_IRQ 0x11
+#define DMI_IPMI_IO_MASK 0xfffe
+
+static void __init dmi_decode_ipmi(const struct dmi_header *dm)
+{
+ const u8 *data = (const u8 *) dm;
+ u32 flags = IORESOURCE_IO;
+ unsigned long base_addr;
+ u8 len = dm->length;
+ u8 slave_addr;
+ int irq = 0, offset;
+ int type;
+
+ if (len < DMI_IPMI_MIN_LENGTH)
+ return;
+
+ type = data[DMI_IPMI_TYPE];
+ slave_addr = data[DMI_IPMI_SLAVEADDR];
+
+ memcpy(&base_addr, data + DMI_IPMI_ADDR, sizeof(unsigned long));
+ if (len >= DMI_IPMI_VER2_LENGTH) {
+ if (type == IPMI_DMI_TYPE_SSIF) {
+ offset = 0;
+ flags = 0;
+ base_addr = data[DMI_IPMI_ADDR] >> 1;
+ if (base_addr == 0) {
+ /*
+ * Some broken systems put the I2C address in
+ * the slave address field. We try to
+ * accommodate them here.
+ */
+ base_addr = data[DMI_IPMI_SLAVEADDR] >> 1;
+ slave_addr = 0;
+ }
+ } else {
+ if (base_addr & 1) {
+ /* I/O */
+ base_addr &= DMI_IPMI_IO_MASK;
+ } else {
+ /* Memory */
+ flags = IORESOURCE_MEM;
+ }
+
+ /*
+ * If bit 4 of byte 0x10 is set, then the lsb
+ * for the address is odd.
+ */
+ base_addr |= (data[DMI_IPMI_ACCESS] >> 4) & 1;
+
+ irq = data[DMI_IPMI_IRQ];
+
+ /*
+ * The top two bits of byte 0x10 hold the
+ * register spacing.
+ */
+ switch ((data[DMI_IPMI_ACCESS] >> 6) & 3) {
+ case 0: /* Byte boundaries */
+ offset = 1;
+ break;
+ case 1: /* 32-bit boundaries */
+ offset = 4;
+ break;
+ case 2: /* 16-byte boundaries */
+ offset = 16;
+ break;
+ default:
+ pr_err("ipmi:dmi: Invalid offset: 0");
+ return;
+ }
+ }
+ } else {
+ /* Old DMI spec. */
+ /*
+ * Note that technically, the lower bit of the base
+ * address should be 1 if the address is I/O and 0 if
+ * the address is in memory. So many systems get that
+ * wrong (and all that I have seen are I/O) so we just
+ * ignore that bit and assume I/O. Systems that use
+ * memory should use the newer spec, anyway.
+ */
+ base_addr = base_addr & DMI_IPMI_IO_MASK;
+ offset = 1;
+ }
+
+ dmi_add_platform_ipmi(base_addr, flags, slave_addr, irq,
+ offset, type);
+}
+
+static int __init scan_for_dmi_ipmi(void)
+{
+ const struct dmi_device *dev = NULL;
+
+ while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
+ dmi_decode_ipmi((const struct dmi_header *) dev->device_data);
+
+ return 0;
+}
+subsys_initcall(scan_for_dmi_ipmi);
projects / linux-2.6-block.git / commitdiff