From fa5bb24685b585521ba7eb52c5d63da43f3e2436 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Sat, 5 May 2018 10:50:12 +0200
Subject: Start and shutdown harddoom device

---
 Kbuild        |  2 +-
 harddoomdev.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 harddoomdev.h |  9 +++++++++
 pci.c         |  4 ++++
 4 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 harddoomdev.c
 create mode 100644 harddoomdev.h

diff --git a/Kbuild b/Kbuild
index 0214343..fdebf0f 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1,2 +1,2 @@
 obj-m := harddoom.o
-harddoom-objs := harddoom_main.o pci.o char.o
+harddoom-objs := harddoom_main.o pci.o char.o harddoomdev.o
diff --git a/harddoomdev.c b/harddoomdev.c
new file mode 100644
index 0000000..f903b10
--- /dev/null
+++ b/harddoomdev.c
@@ -0,0 +1,58 @@
+#include "harddoomdev.h"
+
+#include "harddoom.h"
+#include "doomcode.h"
+#include "pci.h"
+
+void doomdev_write(void __iomem *iomem, size_t addr, uint32_t data)
+{
+	iowrite32(data, iomem + addr);
+}
+
+uint32_t doomdev_read(void __iomem *iomem, size_t addr)
+{
+	return ioread32(iomem + addr);
+}
+
+uint32_t doomdev_read_stat(void __iomem *iomem, size_t stat)
+{
+	return doomdev_read(iomem, HARDDOOM_STATS(stat));
+}
+
+void load_microcode(void __iomem *iomem)
+{
+	int i;
+
+	doomdev_write(iomem, HARDDOOM_FE_CODE_ADDR, 0);
+	for (i = 0; i < ARRAY_SIZE(doomcode); i++) {
+		doomdev_write(iomem, HARDDOOM_FE_CODE_WINDOW, doomcode[i]);
+	}
+}
+	
+void start_dev(struct pci_dev *dev)
+{
+	struct doom_data *data;
+	void __iomem *iomem;
+
+	data = pci_get_drvdata(dev);
+	iomem = data->iomem;
+
+	load_microcode(iomem);
+	doomdev_write(iomem, HARDDOOM_RESET, 0xffffffe);
+	doomdev_write(iomem, HARDDOOM_INTR, 0x3ff);
+	doomdev_write(iomem, HARDDOOM_ENABLE,
+			HARDDOOM_ENABLE_ALL ^ HARDDOOM_ENABLE_FETCH_CMD);
+}
+
+void shutdown_dev(struct pci_dev *dev)
+{
+	struct doom_data *data;
+	void __iomem *iomem;
+
+	data = pci_get_drvdata(dev);
+	iomem = data->iomem;
+
+	doomdev_write(iomem, HARDDOOM_ENABLE, 0);
+	doomdev_write(iomem, HARDDOOM_INTR_ENABLE, 0);
+	doomdev_read(iomem, 0);
+}
diff --git a/harddoomdev.h b/harddoomdev.h
new file mode 100644
index 0000000..da8dfe1
--- /dev/null
+++ b/harddoomdev.h
@@ -0,0 +1,9 @@
+#ifndef HARDDOOMDEV_H
+#define HARDDOOMDEV_H
+
+#include <linux/pci.h>
+
+void start_dev(struct pci_dev *dev);
+void shutdown_dev(struct pci_dev *dev);
+
+#endif
diff --git a/pci.c b/pci.c
index f8626d9..833a72e 100644
--- a/pci.c
+++ b/pci.c
@@ -6,6 +6,7 @@
 #include "char.h"
 #include "harddoom.h"
 #include "util.h"
+#include "harddoomdev.h"
 
 int init_pci(struct pci_dev *dev) {
 	struct doom_data *doom_data;
@@ -53,11 +54,13 @@ int doom_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	int err = 0;
 
 	ORFAIL(init_pci(dev), error_pci);
+	start_dev(dev);
 	ORFAIL(new_doomdev(dev), error_doomdev);
 
 	return 0;
 
 error_doomdev:
+	shutdown_dev(dev);
 	cleanup_pci(dev);
 error_pci:
 	return err;
@@ -70,6 +73,7 @@ void doom_remove (struct pci_dev *dev)
 	doom_data = pci_get_drvdata(dev);
 
 	destroy_doomdev(doom_data);
+	shutdown_dev(dev);
 	cleanup_pci(dev);
 }
 
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