DEV9 module

README.md

@@ -19,9 +19,10 @@ for example the command `make CROSS_COMPILE=mipsr5900el-unknown-linux-gnu-`.
 
 ## Modules
 
-Currently four modules are implemented:
+Currently five modules are implemented:
 [`irq`](module/irq.c),
 [`irqrelay`](module/irqrelay.c),
+[`dev9`](module/dev9.c),
 [`gamepad`](module/gamepad.c) and
 [`printk`](module/printk.c).
 

include/iopmod/dev9.h

@@ -3,12 +3,20 @@
 #ifndef IOPMOD_DEV9_H
 #define IOPMOD_DEV9_H
 
-#define SSBUS_REG_1418 0xbf801418
-#define SSBUS_REG_141c 0xbf80141c
-#define SSBUS_REG_1420 0xbf801420
+#include "iopmod/module-prototype.h"
+#include "iopmod/module/dev9.h"
 
-#define DEV9_REGBASE 0xbf801460
-#define DEV9_REG(reg) (DEV9_REGBASE + 2 * (reg))
+#define SSBUS_REG_1418	0xbf801418
+#define SSBUS_REG_141c	0xbf80141c
+#define SSBUS_REG_1420	0xbf801420
+
+#define DEV9_REGBASE	0xbf801460
+#define DEV9_REG(reg)	(DEV9_REGBASE + 2 * (reg))
+
+#define DEV9_DMAC_BASE	0xbf801510
+#define DEV9_DMAC_MADR	DEV9_DMAC_BASE
+#define DEV9_DMAC_BCR	(DEV9_DMAC_BASE + 0x04)
+#define DEV9_DMAC_CHCR	(DEV9_DMAC_BASE + 0x08)
 
 enum {
 	DEV9_REG_1460, DEV9_REG_1462, DEV9_REG_1464, DEV9_REG_1466,

include/iopmod/module/dev9.h

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+
+MODULE_ID(dev9, 0x0100);
+LIBRARY_ID(dev9, 0x0100);
+
+/**
+ * dev9_request - request DEV9 hardware access
+ *
+ * FIXME: The DEV9 hardware is powered on, if necessary.
+ *
+ * Return: zero on success, or a negative error number
+ */
+id_(0) int dev9_request();
+
+/**
+ * dev9_release - release DEV9 hardware access
+ *
+ * FIXME: The DEV9 hardware is powered off, if it's no longer used.
+ *
+ * Return: zero on success, or a negative error number
+ */
+id_(1) int dev9_release();

include/iopmod/spd.h

@@ -15,4 +15,13 @@
 #define SPD_REG_INTR_STAT	0x28
 #define SPD_REG_INTR_MASK	0x2a
 
+#define SPD_REG_XFR_CTRL	0x32
+#define SPD_REG_0x38		0x38
+#define SPD_REG_IF_CTRL		0x64
+#define   SPD_IF_ATA_RESET	  0x80
+#define   SPD_IF_DMA_ENABLE	  0x04
+#define SPD_REG_PIO_MODE	0x70
+#define SPD_REG_MWDMA_MODE	0x72
+#define SPD_REG_UDMA_MODE	0x74
+
 #endif /* IOPMOD_SPD_H */

module/dev9.c

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DEV9
+ *
+ * Copyright (C) 2021 Fredrik Noring
+ */
+
+#include "iopmod/bits.h"
+#include "iopmod/dev9.h"
+#include "iopmod/errno.h"
+#include "iopmod/io.h"
+#include "iopmod/iop-error.h"
+#include "iopmod/irq.h"
+#include "iopmod/module.h"
+#include "iopmod/printk.h"
+#include "iopmod/spd.h"
+
+/* FIXME: mutex */
+static int dev9_use_count;
+
+static void dev9_power_on()
+{
+	iowr32(0x51011,    SSBUS_REG_1420);
+	iowr32(0xe01a3043, SSBUS_REG_1418);
+	iowr32(0xef1a3043, SSBUS_REG_141c);
+
+	if (!(DEV9_REG(DEV9_REG_POWER) & 0x04)) {
+		pr_info("dev9: power is off\n");
+
+		iowr16(1, DEV9_REG(DEV9_REG_1466));
+		iowr16(0, DEV9_REG(DEV9_REG_1464));
+		iowr16(iord16(DEV9_REG(DEV9_REG_1464)), DEV9_REG(DEV9_REG_1460));
+
+		/* FIXME: Init Speed device */
+	} else {
+		pr_info("dev9: power is already on\n");
+	}
+
+	iowr16(0, DEV9_REG(DEV9_REG_1466));
+
+	const u16 spdrev = iord16(SPD_REG(SPD_REG_REV_1));
+	pr_info("dev9: spdrev %x\n", spdrev);
+
+	pr_info("dev9: rev %x\n", iord8(DEV9_REG(DEV9_REG_REV)));
+}
+
+static void dev9_power_off()
+{
+	/* FIXME */
+}
+
+int dev9_request()
+{
+	int err = 0;
+
+	if (!dev9_use_count)
+		dev9_power_on();
+
+	dev9_use_count++;
+
+	return err;
+}
+
+int dev9_release()
+{
+	int err = 0;
+
+	dev9_use_count--;
+
+	if (!dev9_use_count)
+		dev9_power_off();
+
+	return err;
+}
+
+static enum module_init_status dev9_init(int argc, char *argv[])
+{
+	dev9_power_off();
+
+	return MODULE_RESIDENT;
+}
+module_init(dev9_init);