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path: root/drivers/char/ipmi/ipmi_si_port_io.c
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Diffstat (limited to 'drivers/char/ipmi/ipmi_si_port_io.c')
-rw-r--r--drivers/char/ipmi/ipmi_si_port_io.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_port_io.c b/drivers/char/ipmi/ipmi_si_port_io.c
new file mode 100644
index 000000000000..e5ce174fbeeb
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_si_port_io.c
@@ -0,0 +1,112 @@
+
+#include <linux/io.h>
+#include "ipmi_si.h"
+
+static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return inb(addr + (offset * io->regspacing));
+}
+
+static void port_outb(const struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outb(b, addr + (offset * io->regspacing));
+}
+
+static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
+}
+
+static void port_outw(const struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outw(b << io->regshift, addr + (offset * io->regspacing));
+}
+
+static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
+}
+
+static void port_outl(const struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outl(b << io->regshift, addr+(offset * io->regspacing));
+}
+
+static void port_cleanup(struct si_sm_io *io)
+{
+ unsigned int addr = io->addr_data;
+ int idx;
+
+ if (addr) {
+ for (idx = 0; idx < io->io_size; idx++)
+ release_region(addr + idx * io->regspacing,
+ io->regsize);
+ }
+}
+
+int ipmi_si_port_setup(struct si_sm_io *io)
+{
+ unsigned int addr = io->addr_data;
+ int idx;
+
+ if (!addr)
+ return -ENODEV;
+
+ io->io_cleanup = port_cleanup;
+
+ /*
+ * Figure out the actual inb/inw/inl/etc routine to use based
+ * upon the register size.
+ */
+ switch (io->regsize) {
+ case 1:
+ io->inputb = port_inb;
+ io->outputb = port_outb;
+ break;
+ case 2:
+ io->inputb = port_inw;
+ io->outputb = port_outw;
+ break;
+ case 4:
+ io->inputb = port_inl;
+ io->outputb = port_outl;
+ break;
+ default:
+ dev_warn(io->dev, "Invalid register size: %d\n",
+ io->regsize);
+ return -EINVAL;
+ }
+
+ /*
+ * Some BIOSes reserve disjoint I/O regions in their ACPI
+ * tables. This causes problems when trying to register the
+ * entire I/O region. Therefore we must register each I/O
+ * port separately.
+ */
+ for (idx = 0; idx < io->io_size; idx++) {
+ if (request_region(addr + idx * io->regspacing,
+ io->regsize, DEVICE_NAME) == NULL) {
+ /* Undo allocations */
+ while (idx--)
+ release_region(addr + idx * io->regspacing,
+ io->regsize);
+ return -EIO;
+ }
+ }
+ return 0;
+}