--- /dev/null
+/*
+ * Copyright (C) 1996 Linus Torvalds & author (see below)
+ */
+
+/*
+ * ALI M14xx chipset EIDE controller
+ *
+ * Works for ALI M1439/1443/1445/1487/1489 chipsets.
+ *
+ * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml
+ * Derek's notes follow:
+ *
+ * I think the code should be pretty understandable,
+ * but I'll be happy to (try to) answer questions.
+ *
+ * The critical part is in the setupDrive function. The initRegisters
+ * function doesn't seem to be necessary, but the DOS driver does it, so
+ * I threw it in.
+ *
+ * I've only tested this on my system, which only has one disk. I posted
+ * it to comp.sys.linux.hardware, so maybe some other people will try it
+ * out.
+ *
+ * Derek Noonburg (derekn@ece.cmu.edu)
+ * 95-sep-26
+ *
+ * Update 96-jul-13:
+ *
+ * I've since upgraded to two disks and a CD-ROM, with no trouble, and
+ * I've also heard from several others who have used it successfully.
+ * This driver appears to work with both the 1443/1445 and the 1487/1489
+ * chipsets. I've added support for PIO mode 4 for the 1487. This
+ * seems to work just fine on the 1443 also, although I'm not sure it's
+ * advertised as supporting mode 4. (I've been running a WDC AC21200 in
+ * mode 4 for a while now with no trouble.) -Derek
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+#define DRV_NAME "ali14xx"
+
+/* port addresses for auto-detection */
+#define ALI_NUM_PORTS 4
+static const int ports[ALI_NUM_PORTS] __initconst =
+ { 0x074, 0x0f4, 0x034, 0x0e4 };
+
+/* register initialization data */
+typedef struct { u8 reg, data; } RegInitializer;
+
+static const RegInitializer initData[] __initconst = {
+ {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
+ {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
+ {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
+ {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
+ {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
+ {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
+ {0x35, 0x03}, {0x00, 0x00}
+};
+
+/* timing parameter registers for each drive */
+static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
+ {0x03, 0x26, 0x04, 0x27}, /* drive 0 */
+ {0x05, 0x28, 0x06, 0x29}, /* drive 1 */
+ {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */
+ {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */
+};
+
+static int basePort; /* base port address */
+static int regPort; /* port for register number */
+static int dataPort; /* port for register data */
+static u8 regOn; /* output to base port to access registers */
+static u8 regOff; /* output to base port to close registers */
+
+/*------------------------------------------------------------------------*/
+
+/*
+ * Read a controller register.
+ */
+static inline u8 inReg(u8 reg)
+{
+ outb_p(reg, regPort);
+ return inb(dataPort);
+}
+
+/*
+ * Write a controller register.
+ */
+static void outReg(u8 data, u8 reg)
+{
+ outb_p(reg, regPort);
+ outb_p(data, dataPort);
+}
+
+static DEFINE_SPINLOCK(ali14xx_lock);
+
+/*
+ * Set PIO mode for the specified drive.
+ * This function computes timing parameters
+ * and sets controller registers accordingly.
+ */
+static void ali14xx_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
+{
+ int driveNum;
+ int time1, time2;
+ u8 param1, param2, param3, param4;
+ unsigned long flags;
+ int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
+ const u8 pio = drive->pio_mode - XFER_PIO_0;
+ struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
+
+ /* calculate timing, according to PIO mode */
+ time1 = ide_pio_cycle_time(drive, pio);
+ time2 = t->active;
+ param3 = param1 = (time2 * bus_speed + 999) / 1000;
+ param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
+ if (pio < 3) {
+ param3 += 8;
+ param4 += 8;
+ }
+ printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
+ drive->name, pio, time1, time2, param1, param2, param3, param4);
+
+ /* stuff timing parameters into controller registers */
+ driveNum = (drive->hwif->index << 1) + (drive->dn & 1);
+ spin_lock_irqsave(&ali14xx_lock, flags);
+ outb_p(regOn, basePort);
+ outReg(param1, regTab[driveNum].reg1);
+ outReg(param2, regTab[driveNum].reg2);
+ outReg(param3, regTab[driveNum].reg3);
+ outReg(param4, regTab[driveNum].reg4);
+ outb_p(regOff, basePort);
+ spin_unlock_irqrestore(&ali14xx_lock, flags);
+}
+
+/*
+ * Auto-detect the IDE controller port.
+ */
+static int __init findPort(void)
+{
+ int i;
+ u8 t;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ for (i = 0; i < ALI_NUM_PORTS; ++i) {
+ basePort = ports[i];
+ regOff = inb(basePort);
+ for (regOn = 0x30; regOn <= 0x33; ++regOn) {
+ outb_p(regOn, basePort);
+ if (inb(basePort) == regOn) {
+ regPort = basePort + 4;
+ dataPort = basePort + 8;
+ t = inReg(0) & 0xf0;
+ outb_p(regOff, basePort);
+ local_irq_restore(flags);
+ if (t != 0x50)
+ return 0;
+ return 1; /* success */
+ }
+ }
+ outb_p(regOff, basePort);
+ }
+ local_irq_restore(flags);
+ return 0;
+}
+
+/*
+ * Initialize controller registers with default values.
+ */
+static int __init initRegisters(void)
+{
+ const RegInitializer *p;
+ u8 t;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ outb_p(regOn, basePort);
+ for (p = initData; p->reg != 0; ++p)
+ outReg(p->data, p->reg);
+ outb_p(0x01, regPort);
+ t = inb(regPort) & 0x01;
+ outb_p(regOff, basePort);
+ local_irq_restore(flags);
+ return t;
+}
+
+static const struct ide_port_ops ali14xx_port_ops = {
+ .set_pio_mode = ali14xx_set_pio_mode,
+};
+
+static const struct ide_port_info ali14xx_port_info = {
+ .name = DRV_NAME,
+ .chipset = ide_ali14xx,
+ .port_ops = &ali14xx_port_ops,
+ .host_flags = IDE_HFLAG_NO_DMA,
+ .pio_mask = ATA_PIO4,
+};
+
+static int __init ali14xx_probe(void)
+{
+ printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
+ basePort, regOn);
+
+ /* initialize controller registers */
+ if (!initRegisters()) {
+ printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
+ return 1;
+ }
+
+ return ide_legacy_device_add(&ali14xx_port_info, 0);
+}
+
+static bool probe_ali14xx;
+
+module_param_named(probe, probe_ali14xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
+
+static int __init ali14xx_init(void)
+{
+ if (probe_ali14xx == 0)
+ goto out;
+
+ /* auto-detect IDE controller port */
+ if (findPort()) {
+ if (ali14xx_probe())
+ return -ENODEV;
+ return 0;
+ }
+ printk(KERN_ERR "ali14xx: not found.\n");
+out:
+ return -ENODEV;
+}
+
+module_init(ali14xx_init);
+
+MODULE_AUTHOR("see local file");
+MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff