[PATCH] non-libata driver for Jmicron devices

Less functional than libata this just uses the merged interface provided for
dumb legacy OS's.  This is basically a bridge for people not yet ready to use
libata for some reason or another.

Port visibility is entirely dependant on the BIOS setup.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 276 insertions, 0 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 69d627bd537a..0524f17175fd 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -594,6 +594,12 @@ config BLK_DEV_HPT366
 	  ide-probe at boot. It is reported to support DVD II drives, by the
 	  manufacturer.
 
+config BLK_DEV_JMICRON
+	tristate "JMicron JMB36x support"
+	help
+	  Basic support for the JMicron ATA controllers. For full support
+	  use the libata drivers.
+
 config BLK_DEV_SC1200
 	tristate "National SCx200 chipset support"
 	help
diff --git a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
index f35d684edc25..640a54b09b5a 100644
--- a/drivers/ide/pci/Makefile
+++ b/drivers/ide/pci/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_BLK_DEV_HPT366)		+= hpt366.o
 #obj-$(CONFIG_BLK_DEV_HPT37X)		+= hpt37x.o
 obj-$(CONFIG_BLK_DEV_IT8172)		+= it8172.o
 obj-$(CONFIG_BLK_DEV_IT821X)		+= it821x.o
+obj-$(CONFIG_BLK_DEV_JMICRON)		+= jmicron.o
 obj-$(CONFIG_BLK_DEV_NS87415)		+= ns87415.o
 obj-$(CONFIG_BLK_DEV_OPTI621)		+= opti621.o
 obj-$(CONFIG_BLK_DEV_PDC202XX_OLD)	+= pdc202xx_old.o
diff --git a/drivers/ide/pci/jmicron.c b/drivers/ide/pci/jmicron.c
new file mode 100644
index 000000000000..68c74bbf8b06
--- /dev/null
+++ b/drivers/ide/pci/jmicron.c
@@ -0,0 +1,269 @@
+
+/*
+ * Copyright (C) 2006		Red Hat <alan@redhat.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+typedef enum {
+	PORT_PATA0 = 0,
+	PORT_PATA1 = 1,
+	PORT_SATA = 2,
+} port_type;
+
+/**
+ *	jmicron_ratemask	-	Compute available modes
+ *	@drive: IDE drive
+ *
+ *	Compute the available speeds for the devices on the interface. This
+ *	is all modes to ATA133 clipped by drive cable setup.
+ */
+
+static u8 jmicron_ratemask(ide_drive_t *drive)
+{
+	u8 mode	= 4;
+	if (!eighty_ninty_three(drive))
+		mode = min(mode, (u8)1);
+	return mode;
+}
+
+/**
+ *	ata66_jmicron		-	Cable check
+ *	@hwif: IDE port
+ *
+ *	Return 1 if the cable is 80pin
+ */
+
+static int __devinit ata66_jmicron(ide_hwif_t *hwif)
+{
+	struct pci_dev *pdev = hwif->pci_dev;
+
+	u32 control;
+	u32 control5;
+
+	int port = hwif->channel;
+	port_type port_map[2];
+
+	pci_read_config_dword(pdev, 0x40, &control);
+
+	/* There are two basic mappings. One has the two SATA ports merged
+	   as master/slave and the secondary as PATA, the other has only the
+	   SATA port mapped */
+	if (control & (1 << 23)) {
+		port_map[0] = PORT_SATA;
+		port_map[1] = PORT_PATA0;
+	} else {
+		port_map[0] = PORT_SATA;
+		port_map[1] = PORT_SATA;
+	}
+
+	/* The 365/366 may have this bit set to map the second PATA port
+	   as the internal primary channel */
+	pci_read_config_dword(pdev, 0x80, &control5);
+	if (control5 & (1<<24))
+		port_map[0] = PORT_PATA1;
+
+	/* The two ports may then be logically swapped by the firmware */
+	if (control & (1 << 22))
+		port = port ^ 1;
+
+	/*
+	 *	Now we know which physical port we are talking about we can
+	 *	actually do our cable checking etc. Thankfully we don't need
+	 *	to do the plumbing for other cases.
+	 */
+	switch (port_map[port])
+	{
+	case PORT_PATA0:
+		if (control & (1 << 3))	/* 40/80 pin primary */
+			return 1;
+		return 0;
+	case PORT_PATA1:
+		if (control5 & (1 << 19))	/* 40/80 pin secondary */
+			return 0;
+		return 1;
+	case PORT_SATA:
+		return 1;
+	}
+}
+
+static void jmicron_tuneproc (ide_drive_t *drive, byte mode_wanted)
+{
+	return;
+}
+
+/**
+ *	config_jmicron_chipset_for_pio	-	set drive timings
+ *	@drive: drive to tune
+ *	@speed we want
+ *
+ */
+
+static void config_jmicron_chipset_for_pio (ide_drive_t *drive, byte set_speed)
+{
+	u8 speed = XFER_PIO_0 + ide_get_best_pio_mode(drive, 255, 5, NULL);
+	if (set_speed)
+		(void) ide_config_drive_speed(drive, speed);
+}
+
+/**
+ *	jmicron_tune_chipset	-	set controller timings
+ *	@drive: Drive to set up
+ *	@xferspeed: speed we want to achieve
+ *
+ *	As the JMicron snoops for timings all we actually need to do is
+ *	make sure we don't set an invalid mode. We do need to honour
+ *	the cable detect here.
+ */
+
+static int jmicron_tune_chipset (ide_drive_t *drive, byte xferspeed)
+{
+
+	u8 speed		= ide_rate_filter(jmicron_ratemask(drive), xferspeed);
+
+	return ide_config_drive_speed(drive, speed);
+}
+
+/**
+ *	config_chipset_for_dma	-	configure for DMA
+ *	@drive: drive to configure
+ *
+ *	As the JMicron snoops for timings all we actually need to do is
+ *	make sure we don't set an invalid mode.
+ */
+
+static int config_chipset_for_dma (ide_drive_t *drive)
+{
+	u8 speed	= ide_dma_speed(drive, jmicron_ratemask(drive));
+
+	config_jmicron_chipset_for_pio(drive, !speed);
+	jmicron_tune_chipset(drive, speed);
+	return ide_dma_enable(drive);
+}
+
+/**
+ *	jmicron_configure_drive_for_dma	-	set up for DMA transfers
+ *	@drive: drive we are going to set up
+ *
+ *	As the JMicron snoops for timings all we actually need to do is
+ *	make sure we don't set an invalid mode.
+ */
+
+static int jmicron_config_drive_for_dma (ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= drive->hwif;
+
+	if (ide_use_dma(drive)) {
+		if (config_chipset_for_dma(drive))
+			return hwif->ide_dma_on(drive);
+	}
+	config_jmicron_chipset_for_pio(drive, 1);
+	return hwif->ide_dma_off_quietly(drive);
+}
+
+/**
+ *	init_hwif_jmicron	-	set up hwif structs
+ *	@hwif: interface to set up
+ *
+ *	Minimal set up is required for the Jmicron hardware.
+ */
+
+static void __devinit init_hwif_jmicron(ide_hwif_t *hwif)
+{
+	hwif->speedproc = &jmicron_tune_chipset;
+	hwif->tuneproc	= &jmicron_tuneproc;
+
+	hwif->drives[0].autotune = 1;
+	hwif->drives[1].autotune = 1;
+
+	if (!hwif->dma_base)
+		goto fallback;
+
+	hwif->atapi_dma = 1;
+	hwif->ultra_mask = 0x7f;
+	hwif->mwdma_mask = 0x07;
+
+	hwif->ide_dma_check = &jmicron_config_drive_for_dma;
+	if (!(hwif->udma_four))
+		hwif->udma_four = ata66_jmicron(hwif);
+
+	hwif->autodma = 1;
+	hwif->drives[0].autodma = hwif->autodma;
+	hwif->drives[1].autodma = hwif->autodma;
+	return;
+fallback:
+	hwif->autodma = 0;
+	return;
+}
+
+#define DECLARE_JMB_DEV(name_str)			\
+	{						\
+		.name		= name_str,		\
+		.init_hwif	= init_hwif_jmicron,	\
+		.channels	= 2,			\
+		.autodma	= AUTODMA,		\
+		.bootable	= ON_BOARD,		\
+		.enablebits	= { {0x40, 1, 1}, {0x40, 0x10, 0x10} }, \
+	}
+
+static ide_pci_device_t jmicron_chipsets[] __devinitdata = {
+	/* 0 */ DECLARE_JMB_DEV("JMB361"),
+	/* 1 */ DECLARE_JMB_DEV("JMB363"),
+	/* 2 */ DECLARE_JMB_DEV("JMB365"),
+	/* 3 */ DECLARE_JMB_DEV("JMB366"),
+	/* 4 */ DECLARE_JMB_DEV("JMB368"),
+};
+
+/**
+ *	jmicron_init_one	-	pci layer discovery entry
+ *	@dev: PCI device
+ *	@id: ident table entry
+ *
+ *	Called by the PCI code when it finds a Jmicron controller.
+ *	We then use the IDE PCI generic helper to do most of the work.
+ */
+
+static int __devinit jmicron_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	ide_setup_pci_device(dev, &jmicron_chipsets[id->driver_data]);
+	return 0;
+}
+
+static struct pci_device_id jmicron_pci_tbl[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB361), 0},
+	{ PCI_DEVICE(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB363), 1},
+	{ PCI_DEVICE(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB365), 2},
+	{ PCI_DEVICE(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB366), 3},
+	{ PCI_DEVICE(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB368), 4},
+	{ 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
+
+static struct pci_driver driver = {
+	.name		= "JMicron IDE",
+	.id_table	= jmicron_pci_tbl,
+	.probe		= jmicron_init_one,
+};
+
+static int __init jmicron_ide_init(void)
+{
+	return ide_pci_register_driver(&driver);
+}
+
+module_init(jmicron_ide_init);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("PCI driver module for the JMicron in legacy modes");
+MODULE_LICENSE("GPL");