283 lines
6.6 KiB
C
283 lines
6.6 KiB
C
/*
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* pata_winbond.c - Winbond VLB ATA controllers
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* (C) 2006 Red Hat
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*
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* Support for the Winbond 83759A when operating in advanced mode.
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* Multichip mode is not currently supported.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <linux/platform_device.h>
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#define DRV_NAME "pata_winbond"
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#define DRV_VERSION "0.0.3"
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#define NR_HOST 4 /* Two winbond controllers, two channels each */
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struct winbond_data {
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unsigned long config;
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struct platform_device *platform_dev;
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};
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static struct ata_host *winbond_host[NR_HOST];
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static struct winbond_data winbond_data[NR_HOST];
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static int nr_winbond_host;
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#ifdef MODULE
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static int probe_winbond = 1;
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#else
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static int probe_winbond;
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#endif
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static DEFINE_SPINLOCK(winbond_lock);
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static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
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{
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unsigned long flags;
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spin_lock_irqsave(&winbond_lock, flags);
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outb(reg, port + 0x01);
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outb(val, port + 0x02);
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spin_unlock_irqrestore(&winbond_lock, flags);
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}
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static u8 winbond_readcfg(unsigned long port, u8 reg)
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{
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u8 val;
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unsigned long flags;
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spin_lock_irqsave(&winbond_lock, flags);
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outb(reg, port + 0x01);
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val = inb(port + 0x02);
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spin_unlock_irqrestore(&winbond_lock, flags);
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return val;
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}
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static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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struct ata_timing t;
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struct winbond_data *winbond = ap->host->private_data;
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int active, recovery;
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u8 reg;
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int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);
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reg = winbond_readcfg(winbond->config, 0x81);
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/* Get the timing data in cycles */
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if (reg & 0x40) /* Fast VLB bus, assume 50MHz */
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ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
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else
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ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
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active = (clamp_val(t.active, 3, 17) - 1) & 0x0F;
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recovery = (clamp_val(t.recover, 1, 15) + 1) & 0x0F;
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timing = (active << 4) | recovery;
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winbond_writecfg(winbond->config, timing, reg);
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/* Load the setup timing */
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reg = 0x35;
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if (adev->class != ATA_DEV_ATA)
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reg |= 0x08; /* FIFO off */
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if (!ata_pio_need_iordy(adev))
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reg |= 0x02; /* IORDY off */
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reg |= (clamp_val(t.setup, 0, 3) << 6);
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winbond_writecfg(winbond->config, timing + 1, reg);
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}
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static unsigned int winbond_data_xfer(struct ata_device *dev,
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unsigned char *buf, unsigned int buflen, int rw)
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{
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struct ata_port *ap = dev->link->ap;
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int slop = buflen & 3;
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if (ata_id_has_dword_io(dev->id)) {
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if (rw == READ)
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ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
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else
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iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
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if (unlikely(slop)) {
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__le32 pad;
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if (rw == READ) {
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pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
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memcpy(buf + buflen - slop, &pad, slop);
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} else {
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memcpy(&pad, buf + buflen - slop, slop);
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iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
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}
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buflen += 4 - slop;
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}
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} else
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buflen = ata_sff_data_xfer(dev, buf, buflen, rw);
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return buflen;
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}
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static struct scsi_host_template winbond_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static struct ata_port_operations winbond_port_ops = {
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.inherits = &ata_sff_port_ops,
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.sff_data_xfer = winbond_data_xfer,
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.cable_detect = ata_cable_40wire,
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.set_piomode = winbond_set_piomode,
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};
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/**
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* winbond_init_one - attach a winbond interface
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* @type: Type to display
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* @io: I/O port start
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* @irq: interrupt line
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* @fast: True if on a > 33Mhz VLB
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*
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* Register a VLB bus IDE interface. Such interfaces are PIO and we
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* assume do not support IRQ sharing.
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*/
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static __init int winbond_init_one(unsigned long port)
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{
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struct platform_device *pdev;
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u8 reg;
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int i, rc;
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reg = winbond_readcfg(port, 0x81);
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reg |= 0x80; /* jumpered mode off */
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winbond_writecfg(port, 0x81, reg);
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reg = winbond_readcfg(port, 0x83);
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reg |= 0xF0; /* local control */
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winbond_writecfg(port, 0x83, reg);
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reg = winbond_readcfg(port, 0x85);
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reg |= 0xF0; /* programmable timing */
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winbond_writecfg(port, 0x85, reg);
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reg = winbond_readcfg(port, 0x81);
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if (!(reg & 0x03)) /* Disabled */
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return -ENODEV;
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for (i = 0; i < 2 ; i ++) {
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unsigned long cmd_port = 0x1F0 - (0x80 * i);
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unsigned long ctl_port = cmd_port + 0x206;
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struct ata_host *host;
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struct ata_port *ap;
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void __iomem *cmd_addr, *ctl_addr;
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if (!(reg & (1 << i)))
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continue;
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pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
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if (IS_ERR(pdev))
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return PTR_ERR(pdev);
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rc = -ENOMEM;
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host = ata_host_alloc(&pdev->dev, 1);
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if (!host)
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goto err_unregister;
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ap = host->ports[0];
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rc = -ENOMEM;
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cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);
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ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);
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if (!cmd_addr || !ctl_addr)
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goto err_unregister;
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ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);
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ap->ops = &winbond_port_ops;
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ap->pio_mask = ATA_PIO4;
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ap->flags |= ATA_FLAG_SLAVE_POSS;
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ap->ioaddr.cmd_addr = cmd_addr;
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ap->ioaddr.altstatus_addr = ctl_addr;
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ap->ioaddr.ctl_addr = ctl_addr;
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ata_sff_std_ports(&ap->ioaddr);
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/* hook in a private data structure per channel */
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host->private_data = &winbond_data[nr_winbond_host];
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winbond_data[nr_winbond_host].config = port;
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winbond_data[nr_winbond_host].platform_dev = pdev;
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/* activate */
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rc = ata_host_activate(host, 14 + i, ata_sff_interrupt, 0,
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&winbond_sht);
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if (rc)
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goto err_unregister;
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winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
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}
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return 0;
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err_unregister:
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platform_device_unregister(pdev);
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return rc;
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}
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/**
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* winbond_init - attach winbond interfaces
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*
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* Attach winbond IDE interfaces by scanning the ports it may occupy.
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*/
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static __init int winbond_init(void)
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{
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static const unsigned long config[2] = { 0x130, 0x1B0 };
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int ct = 0;
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int i;
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if (probe_winbond == 0)
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return -ENODEV;
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/*
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* Check both base addresses
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*/
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for (i = 0; i < 2; i++) {
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if (probe_winbond & (1<<i)) {
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int ret = 0;
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unsigned long port = config[i];
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if (request_region(port, 2, "pata_winbond")) {
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ret = winbond_init_one(port);
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if (ret <= 0)
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release_region(port, 2);
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else ct+= ret;
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}
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}
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}
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if (ct != 0)
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return 0;
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return -ENODEV;
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}
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static __exit void winbond_exit(void)
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{
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int i;
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for (i = 0; i < nr_winbond_host; i++) {
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ata_host_detach(winbond_host[i]);
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release_region(winbond_data[i].config, 2);
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platform_device_unregister(winbond_data[i].platform_dev);
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}
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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module_init(winbond_init);
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module_exit(winbond_exit);
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module_param(probe_winbond, int, 0);
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