ide: add it8213 IDE driver

From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 408 insertions, 1 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 4eb420891f9d..d781b2cd3d62 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -606,6 +606,11 @@ config BLK_DEV_PIIX
           the kernel to change PIO, DMA and UDMA speeds and to configure
           the chip to optimum performance.
 
+config BLK_DEV_IT8213
+        tristate "IT8213 IDE support"
+        help
+         This driver adds support for the ITE 8213 IDE controller.
+
 config BLK_DEV_IT821X
         tristate "IT821X IDE support"
         help
diff --git a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
index 73f54dfb8c03..64776ab4329f 100644
--- a/drivers/ide/pci/Makefile
+++ b/drivers/ide/pci/Makefile
@@ -11,7 +11,7 @@ obj-$(CONFIG_BLK_DEV_SC1200)		+= sc1200.o
 obj-$(CONFIG_BLK_DEV_CY82C693)          += cy82c693.o
 obj-$(CONFIG_BLK_DEV_HPT34X)            += hpt34x.o
 obj-$(CONFIG_BLK_DEV_HPT366)            += hpt366.o
-#obj-$(CONFIG_BLK_DEV_HPT37X)           += hpt37x.o
+obj-$(CONFIG_BLK_DEV_IT8213)            += it8213.o
 obj-$(CONFIG_BLK_DEV_IT821X)            += it821x.o
 obj-$(CONFIG_BLK_DEV_JMICRON)           += jmicron.o
 obj-$(CONFIG_BLK_DEV_NS87415)           += ns87415.o
diff --git a/drivers/ide/pci/it8213.c b/drivers/ide/pci/it8213.c
new file mode 100644
index 000000000000..6b46edfba811
--- /dev/null
+++ b/drivers/ide/pci/it8213.c
@@ -0,0 +1,402 @@
+#include <linux/kernel.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>
+
+/*
+ *      it8213_ratemask -       Compute available modes
+ *      @drive: IDE drive
+ *
+ *      Compute the available speeds for the devices on the interface. This
+ *      is all modes to ATA100 clipped by drive cable setup.
+ */
+
+static u8 it8213_ratemask (ide_drive_t *drive)
+{
+        u8 mode = 4;
+        if (!eighty_ninty_three(drive))
+                mode = min(mode, (u8)1);
+        return mode;
+}
+
+/**
+ *      it8213_dma_2_pio                -       return the PIO mode matching DMA
+ *      @xfer_rate: transfer speed
+ *
+ *      Returns the nearest equivalent PIO timing for the PIO or DMA
+ *      mode requested by the controller.
+ */
+
+static u8 it8213_dma_2_pio (u8 xfer_rate) {
+        switch(xfer_rate) {
+                case XFER_UDMA_6:
+                case XFER_UDMA_5:
+                case XFER_UDMA_4:
+                case XFER_UDMA_3:
+                case XFER_UDMA_2:
+                case XFER_UDMA_1:
+                case XFER_UDMA_0:
+                case XFER_MW_DMA_2:
+                case XFER_PIO_4:
+                        return 4;
+                case XFER_MW_DMA_1:
+                case XFER_PIO_3:
+                        return 3;
+                case XFER_SW_DMA_2:
+                case XFER_PIO_2:
+                        return 2;
+                case XFER_MW_DMA_0:
+                case XFER_SW_DMA_1:
+                case XFER_SW_DMA_0:
+                case XFER_PIO_1:
+                case XFER_PIO_0:
+                case XFER_PIO_SLOW:
+                default:
+                        return 0;
+        }
+}
+
+static spinlock_t tune_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ *      it8213_tuneproc -       tune a drive
+ *      @drive: drive to tune
+ *      @mode_wanted: the target operating mode
+ *
+ *      Load the timing settings for this device mode into the
+ *      controller. By the time we are called the mode has been
+ *      modified as neccessary to handle the absence of seperate
+ *      master/slave timers for MWDMA/PIO.
+ *
+ *      This code is only used in pass through mode.
+ */
+
+static void it8213_tuneproc (ide_drive_t *drive,  u8 pio)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        struct pci_dev *dev     = hwif->pci_dev;
+        int is_slave            = (&hwif->drives[1] == drive);
+        int master_port         = 0x40;
+        int slave_port          = 0x44;
+        unsigned long flags;
+        u16 master_data;
+        u8 slave_data;
+
+        u8 timings[][2] = { { 0, 0 },
+                            { 0, 0 },
+                            { 1, 0 },
+                            { 2, 1 },
+                            { 2, 3 }, };
+
+        pio = ide_get_best_pio_mode(drive, pio, 5, NULL);
+
+        spin_lock_irqsave(&tune_lock, flags);
+        pci_read_config_word(dev, master_port, &master_data);
+        if (is_slave) {
+                master_data = master_data | 0x4000;
+                if (pio > 1)
+
+                        master_data = master_data | 0x0070;
+                pci_read_config_byte(dev, slave_port, &slave_data);
+                slave_data = slave_data & 0xf0;
+                slave_data = slave_data | (((timings[pio][0] << 2) | (timings[pio][1]) << 0));
+        } else {
+                master_data = master_data & 0xccf8;
+                if (pio > 1)
+
+                        master_data = master_data | 0x0007;
+                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
+        }
+        pci_write_config_word(dev, master_port, master_data);
+        if (is_slave)
+                pci_write_config_byte(dev, slave_port, slave_data);
+        spin_unlock_irqrestore(&tune_lock, flags);
+}
+
+
+/**
+ *      it8213_tune_chipset     -       set controller timings
+ *      @drive: Drive to set up
+ *      @xferspeed: speed we want to achieve
+ *
+ *      Tune the ITE chipset for the desired mode. If we can't achieve
+ *      the desired mode then tune for a lower one, but ultimately
+ *      make the thing work.
+ */
+
+static int it8213_tune_chipset (ide_drive_t *drive, byte xferspeed)
+{
+
+        ide_hwif_t *hwif        = HWIF(drive);
+        struct pci_dev *dev     = hwif->pci_dev;
+        u8 maslave              = 0x40;
+        u8 speed                = ide_rate_filter(it8213_ratemask(drive), xferspeed);
+        int a_speed             = 3 << (drive->dn * 4);
+        int u_flag              = 1 << drive->dn;
+        int v_flag              = 0x01 << drive->dn;
+        int w_flag              = 0x10 << drive->dn;
+        int u_speed             = 0;
+        u16                     reg4042, reg4a;
+        u8                      reg48, reg54, reg55;
+
+        pci_read_config_word(dev, maslave, &reg4042);
+        pci_read_config_byte(dev, 0x48, &reg48);
+        pci_read_config_word(dev, 0x4a, &reg4a);
+        pci_read_config_byte(dev, 0x54, &reg54);
+        pci_read_config_byte(dev, 0x55, &reg55);
+
+        switch(speed) {
+                case XFER_UDMA_6:
+                case XFER_UDMA_4:
+                case XFER_UDMA_2:u_speed = 2 << (drive->dn * 4); break;
+                case XFER_UDMA_5:
+                case XFER_UDMA_3:
+                case XFER_UDMA_1:u_speed = 1 << (drive->dn * 4); break;
+                case XFER_UDMA_0:u_speed = 0 << (drive->dn * 4); break;
+                        break;
+                case XFER_MW_DMA_2:
+                case XFER_MW_DMA_1:
+                case XFER_MW_DMA_0:
+                        break;
+                case XFER_PIO_4:
+                case XFER_PIO_3:
+                case XFER_PIO_2:
+                case XFER_PIO_1:
+                case XFER_PIO_0:
+                        break;
+                default:
+                        return -1;
+        }
+
+                if (speed >= XFER_UDMA_0)
+                {
+                if (!(reg48 & u_flag))
+                        pci_write_config_byte(dev, 0x48, reg48 | u_flag);
+                if (speed >= XFER_UDMA_5) {
+                        pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
+                } else {
+                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+                }
+
+                if ((reg4a & a_speed) != u_speed)
+                        pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
+                if (speed > XFER_UDMA_2)
+                {
+                        if (!(reg54 & v_flag))
+                                pci_write_config_byte(dev, 0x54, reg54 | v_flag);
+                } else
+                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+                } else /*if(speed >= XFER_UDMA_0)*/
+                {
+                if (reg48 & u_flag)
+                        pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
+                if (reg4a & a_speed)
+                        pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
+                if (reg54 & v_flag)
+                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+                if (reg55 & w_flag)
+                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+                }
+        it8213_tuneproc(drive, it8213_dma_2_pio(speed));
+        return ide_config_drive_speed(drive, speed);
+        }
+
+
+/*
+ *      config_chipset_for_dma  -       configure for DMA
+ *      @drive: drive to configure
+ *
+ *      Called by the IDE layer when it wants the timings set up.
+ */
+
+static int config_chipset_for_dma (ide_drive_t *drive)
+{
+          u8 speed      = ide_dma_speed(drive, it8213_ratemask(drive));
+        if (!speed)
+        {
+                u8 tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
+                speed = it8213_dma_2_pio(XFER_PIO_0 + tspeed);
+        }
+//      config_it8213_chipset_for_pio(drive, !speed);
+        it8213_tune_chipset(drive, speed);
+        return ide_dma_enable(drive);
+}
+
+/**
+ *      config_it8213_chipset_for_pio   -       set drive timings
+ *      @drive: drive to tune
+ *      @speed we want
+ *
+ *      Compute the best pio mode we can for a given device. We must
+ *      pick a speed that does not cause problems with the other device
+ *      on the cable.
+ */
+/*
+static void config_it8213_chipset_for_pio (ide_drive_t *drive, byte set_speed)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+//      u8 unit = drive->select.b.unit;
+        ide_hwif_t *hwif = drive->hwif;
+        ide_drive_t *pair = &hwif->drives[1-unit];
+        u8 speed = 0, set_pio   = ide_get_best_pio_mode(drive, 255, 5, NULL);
+        u8 pair_pio;
+
+        if(pair != NULL) {
+                pair_pio = ide_get_best_pio_mode(pair, 255, 5, NULL);
+                if(pair_pio < set_pio)
+                        set_pio = pair_pio;
+        }
+        it8213_tuneproc(drive, set_pio);
+        speed = XFER_PIO_0 + set_pio;
+        if (set_speed)
+                (void) ide_config_drive_speed(drive, speed);
+}
+*/
+/**
+ *      it8213_configure_drive_for_dma  -       set up for DMA transfers
+ *      @drive: drive we are going to set up
+ *
+ *      Set up the drive for DMA, tune the controller and drive as
+ *      required. If the drive isn't suitable for DMA or we hit
+ *      other problems then we will drop down to PIO and set up
+ *      PIO appropriately
+ */
+
+static int it8213_config_drive_for_dma (ide_drive_t *drive)
+{
+//      ide_hwif_t *hwif        = drive->hwif;
+//      struct hd_driveid *id = drive->id;
+        ide_hwif_t *hwif        = HWIF(drive);
+        if (ide_use_dma(drive)) {
+                if (config_chipset_for_dma(drive))
+                        return hwif->ide_dma_on(drive);
+        }
+//      config_it8213_chipset_for_pio(drive, 1);
+        hwif->tuneproc(drive, 255);
+        return hwif->ide_dma_off_quietly(drive);
+}
+
+
+static unsigned int __devinit init_chipset_it8213(struct pci_dev *dev, const char *name)
+{
+        printk(KERN_INFO "it8213: controller in IDE mode.\n");
+        return 0;
+}
+
+
+/**
+ *      init_hwif_it8213        -       set up hwif structs
+ *      @hwif: interface to set up
+ *
+ *      We do the basic set up of the interface structure. The IT8212
+ *      requires several custom handlers so we override the default
+ *      ide DMA handlers appropriately
+ */
+
+static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
+{
+        u8 reg42h = 0, ata66 = 0;
+        u8 mask = 0x02;
+
+        hwif->atapi_dma = 1;
+
+        hwif->speedproc = &it8213_tune_chipset;
+        hwif->tuneproc  = &it8213_tuneproc;
+
+        hwif->autodma = 0;
+
+        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->swdma_mask = 0x07;
+
+        pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
+        ata66 = (reg42h & mask) ? 0 : 1;
+
+        hwif->ide_dma_check = &it8213_config_drive_for_dma;
+        if (!(hwif->udma_four))
+                hwif->udma_four = ata66;
+//              hwif->udma_four = 0;
+
+        /*
+         *      The BIOS often doesn't set up DMA on this controller
+         *      so we always do it.
+         */
+        if (!noautodma)
+                hwif->autodma = 1;
+
+        hwif->drives[0].autodma = hwif->autodma;
+        hwif->drives[1].autodma = hwif->autodma;
+        return;
+fallback:
+        hwif->autodma = 0;
+        return;
+}
+
+
+#define DECLARE_ITE_DEV(name_str)                       \
+        {                                               \
+                .name           = name_str,             \
+                .init_chipset   = init_chipset_it8213,  \
+                .init_hwif      = init_hwif_it8213,     \
+                .channels       = 1,                    \
+                .autodma                = AUTODMA,              \
+                .enablebits     = {{0x41,0x80,0x80}}, \
+                .bootable       = ON_BOARD,             \
+        }
+
+static ide_pci_device_t it8213_chipsets[] __devinitdata = {
+        /* 0 */ DECLARE_ITE_DEV("IT8213"),
+};
+
+
+/**
+ *      it8213_init_one -       pci layer discovery entry
+ *      @dev: PCI device
+ *      @id: ident table entry
+ *
+ *      Called by the PCI code when it finds an ITE8213 controller. As
+ *      this device follows the standard interfaces we can use the
+ *      standard helper functions to do almost all the work for us.
+ */
+
+static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
+        return 0;
+}
+
+
+static struct pci_device_id it8213_pci_tbl[] = {
+        { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8213,  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+        { 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
+
+static struct pci_driver driver = {
+        .name           = "ITE8213_IDE",
+        .id_table       = it8213_pci_tbl,
+        .probe          = it8213_init_one,
+};
+
+static int __init it8213_ide_init(void)
+{
+        return ide_pci_register_driver(&driver); }
+
+module_init(it8213_ide_init);
+
+MODULE_AUTHOR("Jack and Alan Cox");             /* Update this */
+MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
+MODULE_LICENSE("GPL");