From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/char/ipmi/ipmi_si_mem_io.c | 146 +++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 drivers/char/ipmi/ipmi_si_mem_io.c

(limited to 'drivers/char/ipmi/ipmi_si_mem_io.c')

diff --git a/drivers/char/ipmi/ipmi_si_mem_io.c b/drivers/char/ipmi/ipmi_si_mem_io.c
new file mode 100644
index 0000000000..86b92e93a7
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_si_mem_io.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/io.h>
+#include "ipmi_si.h"
+
+static unsigned char intf_mem_inb(const struct si_sm_io *io,
+				  unsigned int offset)
+{
+	return readb((io->addr)+(offset * io->regspacing));
+}
+
+static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset,
+			  unsigned char b)
+{
+	writeb(b, (io->addr)+(offset * io->regspacing));
+}
+
+static unsigned char intf_mem_inw(const struct si_sm_io *io,
+				  unsigned int offset)
+{
+	return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
+		& 0xff;
+}
+
+static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset,
+			  unsigned char b)
+{
+	writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+
+static unsigned char intf_mem_inl(const struct si_sm_io *io,
+				  unsigned int offset)
+{
+	return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
+		& 0xff;
+}
+
+static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset,
+			  unsigned char b)
+{
+	writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+
+#ifdef readq
+static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset)
+{
+	return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
+		& 0xff;
+}
+
+static void mem_outq(const struct si_sm_io *io, unsigned int offset,
+		     unsigned char b)
+{
+	writeq((u64)b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+#endif
+
+static void mem_region_cleanup(struct si_sm_io *io, int num)
+{
+	unsigned long addr = io->addr_data;
+	int idx;
+
+	for (idx = 0; idx < num; idx++)
+		release_mem_region(addr + idx * io->regspacing,
+				   io->regsize);
+}
+
+static void mem_cleanup(struct si_sm_io *io)
+{
+	if (io->addr) {
+		iounmap(io->addr);
+		mem_region_cleanup(io, io->io_size);
+	}
+}
+
+int ipmi_si_mem_setup(struct si_sm_io *io)
+{
+	unsigned long addr = io->addr_data;
+	int           mapsize, idx;
+
+	if (!addr)
+		return -ENODEV;
+
+	/*
+	 * Figure out the actual readb/readw/readl/etc routine to use based
+	 * upon the register size.
+	 */
+	switch (io->regsize) {
+	case 1:
+		io->inputb = intf_mem_inb;
+		io->outputb = intf_mem_outb;
+		break;
+	case 2:
+		io->inputb = intf_mem_inw;
+		io->outputb = intf_mem_outw;
+		break;
+	case 4:
+		io->inputb = intf_mem_inl;
+		io->outputb = intf_mem_outl;
+		break;
+#ifdef readq
+	case 8:
+		io->inputb = mem_inq;
+		io->outputb = mem_outq;
+		break;
+#endif
+	default:
+		dev_warn(io->dev, "Invalid register size: %d\n",
+			 io->regsize);
+		return -EINVAL;
+	}
+
+	/*
+	 * Some BIOSes reserve disjoint memory regions in their ACPI
+	 * tables.  This causes problems when trying to request the
+	 * entire region.  Therefore we must request each register
+	 * separately.
+	 */
+	for (idx = 0; idx < io->io_size; idx++) {
+		if (request_mem_region(addr + idx * io->regspacing,
+				       io->regsize, SI_DEVICE_NAME) == NULL) {
+			/* Undo allocations */
+			mem_region_cleanup(io, idx);
+			return -EIO;
+		}
+	}
+
+	/*
+	 * Calculate the total amount of memory to claim.  This is an
+	 * unusual looking calculation, but it avoids claiming any
+	 * more memory than it has to.  It will claim everything
+	 * between the first address to the end of the last full
+	 * register.
+	 */
+	mapsize = ((io->io_size * io->regspacing)
+		   - (io->regspacing - io->regsize));
+	io->addr = ioremap(addr, mapsize);
+	if (io->addr == NULL) {
+		mem_region_cleanup(io, io->io_size);
+		return -EIO;
+	}
+
+	io->io_cleanup = mem_cleanup;
+
+	return 0;
+}
-- 
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