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path: root/drivers/char/ipmi/ipmi_si_pci.c
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Diffstat (limited to 'drivers/char/ipmi/ipmi_si_pci.c')
-rw-r--r--drivers/char/ipmi/ipmi_si_pci.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_pci.c b/drivers/char/ipmi/ipmi_si_pci.c
new file mode 100644
index 000000000000..27dd11c49d21
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_si_pci.c
@@ -0,0 +1,169 @@
+/*
+ * ipmi_si_pci.c
+ *
+ * Handling for IPMI devices on the PCI bus.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include "ipmi_si.h"
+
+#define PFX "ipmi_pci: "
+
+static bool pci_registered;
+
+static bool si_trypci = true;
+
+module_param_named(trypci, si_trypci, bool, 0);
+MODULE_PARM_DESC(trypci, "Setting this to zero will disable the"
+ " default scan of the interfaces identified via pci");
+
+#define PCI_ERMC_CLASSCODE 0x0C0700
+#define PCI_ERMC_CLASSCODE_MASK 0xffffff00
+#define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
+#define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
+#define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
+#define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
+
+#define PCI_HP_VENDOR_ID 0x103C
+#define PCI_MMC_DEVICE_ID 0x121A
+#define PCI_MMC_ADDR_CW 0x10
+
+static void ipmi_pci_cleanup(struct si_sm_io *io)
+{
+ struct pci_dev *pdev = io->addr_source_data;
+
+ pci_disable_device(pdev);
+}
+
+static int ipmi_pci_probe_regspacing(struct si_sm_io *io)
+{
+ if (io->si_type == SI_KCS) {
+ unsigned char status;
+ int regspacing;
+
+ io->regsize = DEFAULT_REGSIZE;
+ io->regshift = 0;
+
+ /* detect 1, 4, 16byte spacing */
+ for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
+ io->regspacing = regspacing;
+ if (io->io_setup(io)) {
+ dev_err(io->dev,
+ "Could not setup I/O space\n");
+ return DEFAULT_REGSPACING;
+ }
+ /* write invalid cmd */
+ io->outputb(io, 1, 0x10);
+ /* read status back */
+ status = io->inputb(io, 1);
+ io->io_cleanup(io);
+ if (status)
+ return regspacing;
+ regspacing *= 4;
+ }
+ }
+ return DEFAULT_REGSPACING;
+}
+
+static int ipmi_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int rv;
+ int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
+ struct si_sm_io io;
+
+ memset(&io, 0, sizeof(io));
+ io.addr_source = SI_PCI;
+ dev_info(&pdev->dev, "probing via PCI");
+
+ switch (class_type) {
+ case PCI_ERMC_CLASSCODE_TYPE_SMIC:
+ io.si_type = SI_SMIC;
+ break;
+
+ case PCI_ERMC_CLASSCODE_TYPE_KCS:
+ io.si_type = SI_KCS;
+ break;
+
+ case PCI_ERMC_CLASSCODE_TYPE_BT:
+ io.si_type = SI_BT;
+ break;
+
+ default:
+ dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
+ return -ENOMEM;
+ }
+
+ rv = pci_enable_device(pdev);
+ if (rv) {
+ dev_err(&pdev->dev, "couldn't enable PCI device\n");
+ return rv;
+ }
+
+ io.addr_source_cleanup = ipmi_pci_cleanup;
+ io.addr_source_data = pdev;
+
+ if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
+ io.addr_type = IPMI_IO_ADDR_SPACE;
+ io.io_setup = ipmi_si_port_setup;
+ } else {
+ io.addr_type = IPMI_MEM_ADDR_SPACE;
+ io.io_setup = ipmi_si_mem_setup;
+ }
+ io.addr_data = pci_resource_start(pdev, 0);
+
+ io.regspacing = ipmi_pci_probe_regspacing(&io);
+ io.regsize = DEFAULT_REGSIZE;
+ io.regshift = 0;
+
+ io.irq = pdev->irq;
+ if (io.irq)
+ io.irq_setup = ipmi_std_irq_setup;
+
+ io.dev = &pdev->dev;
+
+ dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
+ &pdev->resource[0], io.regsize, io.regspacing, io.irq);
+
+ rv = ipmi_si_add_smi(&io);
+ if (rv)
+ pci_disable_device(pdev);
+
+ return rv;
+}
+
+static void ipmi_pci_remove(struct pci_dev *pdev)
+{
+ ipmi_si_remove_by_dev(&pdev->dev);
+}
+
+static const struct pci_device_id ipmi_pci_devices[] = {
+ { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
+ { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
+
+static struct pci_driver ipmi_pci_driver = {
+ .name = DEVICE_NAME,
+ .id_table = ipmi_pci_devices,
+ .probe = ipmi_pci_probe,
+ .remove = ipmi_pci_remove,
+};
+
+void ipmi_si_pci_init(void)
+{
+ if (si_trypci) {
+ int rv = pci_register_driver(&ipmi_pci_driver);
+ if (rv)
+ pr_err(PFX "Unable to register PCI driver: %d\n", rv);
+ else
+ pci_registered = true;
+ }
+}
+
+void ipmi_si_pci_shutdown(void)
+{
+ if (pci_registered)
+ pci_unregister_driver(&ipmi_pci_driver);
+}