[PATCH] libata: Winbond support

Winbond 83759A support in non-multichip mode (afaik nobody ever used
multichip mode anyway). The 83759 is not supported by this driver as it
is already handled elsewhere and doens't use the same interfaces.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/Kconfig

@@ -483,6 +483,13 @@ config PATA_WINBOND
 
 	  If unsure, say N.
 
+config PATA_WINBOND_VLB
+	tristate "Winbond W83759A VLB PATA support (Experimental)"
+	depends on ISA && EXPERIMENTAL
+	help
+	  Support for the Winbond W83759A controller on Vesa Local Bus
+	  systems.
+
 endif
 endmenu
 

drivers/ata/Makefile

@@ -51,6 +51,7 @@ obj-$(CONFIG_PATA_SERVERWORKS)	+= pata_serverworks.o
 obj-$(CONFIG_PATA_SIL680)	+= pata_sil680.o
 obj-$(CONFIG_PATA_VIA)		+= pata_via.o
 obj-$(CONFIG_PATA_WINBOND)	+= pata_sl82c105.o
+obj-$(CONFIG_PATA_WINBOND_VLB)	+= pata_winbond.o
 obj-$(CONFIG_PATA_SIS)		+= pata_sis.o
 obj-$(CONFIG_PATA_TRIFLEX)	+= pata_triflex.o
 # Should be last but one libata driver

drivers/ata/pata_winbond.c

+/*
+ *    pata_winbond.c - Winbond VLB ATA controllers
+ *	(C) 2006 Red Hat <alan@redhat.com>
+ *
+ *    Support for the Winbond 83759A when operating in advanced mode.
+ *    Multichip mode is not currently supported.
+ */
+ 
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "pata_winbond"
+#define DRV_VERSION "0.0.1"
+
+#define NR_HOST 4	/* Two winbond controllers, two channels each */
+
+struct winbond_data {
+	unsigned long config;
+	struct platform_device *platform_dev;
+};
+
+static struct ata_host *winbond_host[NR_HOST];
+static struct winbond_data winbond_data[NR_HOST];
+static int nr_winbond_host;
+
+#ifdef MODULE
+static int probe_winbond = 1;
+#else
+static int probe_winbond;
+#endif
+
+static spinlock_t winbond_lock = SPIN_LOCK_UNLOCKED;
+
+static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&winbond_lock, flags);
+	outb(reg, port + 0x01);
+	outb(val, port + 0x02);
+	spin_unlock_irqrestore(&winbond_lock, flags);
+}
+
+static u8 winbond_readcfg(unsigned long port, u8 reg)
+{
+	u8 val;
+
+	unsigned long flags;
+	spin_lock_irqsave(&winbond_lock, flags);
+	outb(reg, port + 0x01);
+	val = inb(port + 0x02);
+	spin_unlock_irqrestore(&winbond_lock, flags);
+
+	return val;
+}
+
+static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct ata_timing t;
+	struct winbond_data *winbond = ap->host->private_data;
+	int active, recovery;
+	u8 reg;
+	int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);
+
+	reg = winbond_readcfg(winbond->config, 0x81);
+	
+	/* Get the timing data in cycles */
+	if (reg & 0x40)		/* Fast VLB bus, assume 50MHz */
+		ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
+	else
+		ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
+
+	active = (FIT(t.active, 3, 17) - 1) & 0x0F;
+	recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F;
+	timing = (active << 4) | recovery;
+	winbond_writecfg(winbond->config, timing, reg);
+	
+	/* Load the setup timing */
+	
+	reg = 0x35;
+	if (adev->class != ATA_DEV_ATA)
+		reg |= 0x08;	/* FIFO off */
+	if (!ata_pio_need_iordy(adev))
+		reg |= 0x02;	/* IORDY off */
+	reg |= (FIT(t.setup, 0, 3) << 6);
+	winbond_writecfg(winbond->config, timing + 1, reg);
+}
+
+
+static void winbond_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
+{
+	struct ata_port *ap = adev->ap;
+	int slop = buflen & 3;
+
+	if (ata_id_has_dword_io(adev->id)) {
+		if (write_data)
+			outsl(ap->ioaddr.data_addr, buf, buflen >> 2);
+		else
+			insl(ap->ioaddr.data_addr, buf, buflen >> 2);
+
+		if (unlikely(slop)) {
+			u32 pad;
+			if (write_data) {
+				memcpy(&pad, buf + buflen - slop, slop);
+				outl(le32_to_cpu(pad), ap->ioaddr.data_addr);
+			} else {
+				pad = cpu_to_le16(inl(ap->ioaddr.data_addr));
+				memcpy(buf + buflen - slop, &pad, slop);
+			}
+		}
+	} else
+		ata_pio_data_xfer(adev, buf, buflen, write_data);
+}
+
+static struct scsi_host_template winbond_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.max_sectors		= ATA_MAX_SECTORS,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.bios_param		= ata_std_bios_param,
+};
+
+static struct ata_port_operations winbond_port_ops = {
+	.port_disable	= ata_port_disable,
+	.set_piomode	= winbond_set_piomode,
+
+	.tf_load	= ata_tf_load,
+	.tf_read	= ata_tf_read,
+	.check_status 	= ata_check_status,
+	.exec_command	= ata_exec_command,
+	.dev_select 	= ata_std_dev_select,
+
+	.freeze		= ata_bmdma_freeze,
+	.thaw		= ata_bmdma_thaw,
+	.error_handler	= ata_bmdma_error_handler,
+	.post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+	.qc_prep 	= ata_qc_prep,
+	.qc_issue	= ata_qc_issue_prot,
+
+	.data_xfer	= winbond_data_xfer,
+
+	.irq_handler	= ata_interrupt,
+	.irq_clear	= ata_bmdma_irq_clear,
+
+	.port_start	= ata_port_start,
+	.port_stop	= ata_port_stop,
+	.host_stop	= ata_host_stop
+};
+
+/**
+ *	winbond_init_one		-	attach a winbond interface
+ *	@type: Type to display
+ *	@io: I/O port start
+ *	@irq: interrupt line
+ *	@fast: True if on a > 33Mhz VLB
+ *
+ *	Register a VLB bus IDE interface. Such interfaces are PIO and we
+ *	assume do not support IRQ sharing.
+ */
+
+static __init int winbond_init_one(unsigned long port)
+{
+	struct ata_probe_ent ae;
+	struct platform_device *pdev;
+	int ret;
+	u8 reg;
+	int i;
+
+	reg = winbond_readcfg(port, 0x81);
+	reg |= 0x80;	/* jumpered mode off */
+	winbond_writecfg(port, 0x81, reg);
+	reg = winbond_readcfg(port, 0x83);
+	reg |= 0xF0;	/* local control */
+	winbond_writecfg(port, 0x83, reg);
+	reg = winbond_readcfg(port, 0x85);
+	reg |= 0xF0;	/* programmable timing */
+	winbond_writecfg(port, 0x85, reg);
+
+	reg = winbond_readcfg(port, 0x81);
+	
+	if (!(reg & 0x03))		/* Disabled */
+		return 0;
+
+	for (i = 0; i < 2 ; i ++) {
+
+		if (reg & (1 << i)) {		
+			/*
+			 *	Fill in a probe structure first of all
+			 */
+
+			pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
+			if (pdev == NULL)
+				return -ENOMEM;
+
+			memset(&ae, 0, sizeof(struct ata_probe_ent));
+			INIT_LIST_HEAD(&ae.node);
+			ae.dev = &pdev->dev;
+
+			ae.port_ops = &winbond_port_ops;
+			ae.pio_mask = 0x1F;
+
+			ae.sht = &winbond_sht;
+	
+			ae.n_ports = 1;
+			ae.irq = 14 + i;
+			ae.irq_flags = 0;
+			ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
+			ae.port[0].cmd_addr = 0x1F0 - (0x80 * i);
+			ae.port[0].altstatus_addr = ae.port[0].cmd_addr + 0x0206;
+			ae.port[0].ctl_addr = ae.port[0].altstatus_addr;
+			ata_std_ports(&ae.port[0]);
+			/*
+			 *	Hook in a private data structure per channel
+			 */
+			ae.private_data = &winbond_data[nr_winbond_host];
+			winbond_data[nr_winbond_host].config = port;
+			winbond_data[nr_winbond_host].platform_dev = pdev;
+
+			ret = ata_device_add(&ae);
+			if (ret == 0) {
+				platform_device_unregister(pdev);
+				return -ENODEV;
+			}
+			winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ *	winbond_init		-	attach winbond interfaces
+ *
+ *	Attach winbond IDE interfaces by scanning the ports it may occupy.
+ */
+
+static __init int winbond_init(void)
+{
+	static const unsigned long config[2] = { 0x130, 0x1B0 };
+
+	int ct = 0;
+	int i;
+	
+	if (probe_winbond == 0)
+		return -ENODEV;
+
+	/*
+ 	 *	Check both base addresses
+	 */
+
+	for (i = 0; i < 2; i++) {
+		if (probe_winbond & (1<<i)) {
+			int ret = 0;
+			unsigned long port = config[i];
+
+			if (request_region(port, 2, "pata_winbond")) {
+				ret = winbond_init_one(port);
+				if(ret <= 0)
+					release_region(port, 2);
+				else ct+= ret;
+			}
+		}
+	}
+	if (ct != 0)
+		return 0;
+	return -ENODEV;
+}
+
+static __exit void winbond_exit(void)
+{
+	int i;
+
+	for (i = 0; i < nr_winbond_host; i++) {
+		ata_host_remove(winbond_host[i]);
+		release_region(winbond_data[i].config, 2);
+		platform_device_unregister(winbond_data[i].platform_dev);
+	}
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(winbond_init);
+module_exit(winbond_exit);
+
+module_param(probe_winbond, int, 0);
+