Geert's PPC support and Hydra driver

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@430 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/busses/Module.mk

@@ -23,7 +23,8 @@ MODULE_DIR := kernel/busses
 # Regrettably, even 'simply expanded variables' will not put their currently
 # defined value verbatim into the command-list of rules...
 KERNELBUSSESTARGETS := $(MODULE_DIR)/i2c-piix4.o $(MODULE_DIR)/i2c-isa.o \
-		       $(MODULE_DIR)/i2c-via.o $(MODULE_DIR)/i2c-ali15x3.o
+		       $(MODULE_DIR)/i2c-via.o $(MODULE_DIR)/i2c-ali15x3.o \
+                       $(MODULE_DIR)/i2c-hydra.o
 
 KERNELBUSSESOLD := bit-via.o bit-mb.o isa.o piix4.o
 

kernel/busses/i2c-hydra.c

@@ -0,0 +1,184 @@
+/*
+    i2c-hydra.c - Part of lm_sensors,  Linux kernel modules
+                  for hardware monitoring
+
+    i2c Support for the Apple `Hydra' Mac I/O
+
+    Copyright (c) 1999 Geert Uytterhoeven <geert@linux-m68k.org>
+
+    Based on i2c Support for Via Technologies 82C586B South Bridge
+    Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <linux/types.h>
+
+#include "i2c.h"
+#include "algo-bit.h"
+
+/* PCI device */
+#define VENDOR		PCI_VENDOR_ID_APPLE
+#define DEVICE		PCI_DEVICE_ID_APPLE_HYDRA
+
+#define HYDRA_CACHE_PD	0x00000030
+
+#define HYDRA_CPD_PD0	0x00000001	/* CachePD lines */
+#define HYDRA_CPD_PD1	0x00000002
+#define HYDRA_CPD_PD2	0x00000004
+#define HYDRA_CPD_PD3	0x00000008
+
+#define HYDRA_SCLK	HYDRA_CPD_PD0
+#define HYDRA_SDAT	HYDRA_CPD_PD1
+#define HYDRA_SCLK_OE	0x00000010
+#define HYDRA_SDAT_OE	0x00000020
+
+static unsigned long hydra_base;
+
+static inline void pdregw(u32 val)
+{
+	writel(val, hydra_base+HYDRA_CACHE_PD);
+}
+
+static inline u32 pdregr(void)
+{
+	u32 val = readl(hydra_base+HYDRA_CACHE_PD);
+	return val;
+}
+
+static void bit_hydra_setscl(void *data, int state)
+{
+    u32 val = pdregr();
+    if (state)
+	val &= ~ HYDRA_SCLK_OE;
+    else {
+	val &= ~HYDRA_SCLK;
+	val |= HYDRA_SCLK_OE;
+    }
+    pdregw(val);
+}
+
+static void bit_hydra_setsda(void *data, int state)
+{
+    u32 val = pdregr();
+    if (state)
+	val &= ~ HYDRA_SDAT_OE;
+    else {
+	val &= ~HYDRA_SDAT;
+	val |= HYDRA_SDAT_OE;
+    }
+    pdregw(val);
+}
+
+static int bit_hydra_getscl(void *data)
+{
+	return (pdregr() & HYDRA_SCLK) != 0;
+}
+
+static int bit_hydra_getsda(void *data)
+{
+	return (pdregr() & HYDRA_SDAT) != 0;
+}
+
+static int bit_hydra_reg(struct i2c_client *client)
+{
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static int bit_hydra_unreg(struct i2c_client *client)
+{
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+
+struct bit_adapter bit_hydra_ops = {
+	"Hydra i2c",
+	HW_B_HYDRA,
+	NULL,
+	bit_hydra_setsda,
+	bit_hydra_setscl,
+	bit_hydra_getsda,
+	bit_hydra_getscl,
+	bit_hydra_reg,
+	bit_hydra_unreg,
+	5, 5, 100,	/*waits, timeout */
+};
+
+
+static int find_hydra(void)
+{
+	struct pci_dev *dev;
+
+	if (!pci_present())
+		return -ENODEV;
+		
+	dev = pci_find_device(VENDOR, DEVICE, NULL);
+		
+	if (!dev) {
+		printk("Hydra not found\n");
+		return -ENODEV;
+	}
+
+	hydra_base = (unsigned long)ioremap(dev->base_address[0], 0x100);
+
+	return 0;
+}
+
+int init_i2c_hydra(void)
+{
+	if (find_hydra() < 0) {
+		printk("Error while reading PCI configuration\n");
+		return -ENODEV;
+	}
+
+	pdregw(0);	/* clear SCLK_OE and SDAT_OE */
+
+	if (i2c_bit_add_bus(&bit_hydra_ops) == 0) {
+		printk("Hydra i2c: Module succesfully loaded\n");
+		return 0;
+	} else {
+		iounmap((void *)hydra_base);
+		printk("Hydra i2c: Algo-bit error, couldn't register bus\n");
+		return -ENODEV;
+	}
+}
+
+#ifdef MODULE
+MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
+MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
+
+int init_module(void) 
+{
+	return init_i2c_hydra();
+}
+
+void cleanup_module(void) 
+{
+	i2c_bit_del_bus(&bit_hydra_ops);
+	if (hydra_base) {
+		pdregw(0);	/* clear SCLK_OE and SDAT_OE */
+		iounmap((void *)hydra_base);
+	}
+}
+#endif

kernel/smbus.c

@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/stddef.h>
+#include <asm/system.h>
 
 #include "i2c.h"
 #ifdef I2C_SPINLOCK