serial: add support for ITE 887x chips

Add support for the it887x-chips (PCI) manufactured by ITE.

Signed-off-by: Niels de Vos <niels.devos@wincor-nixdorf.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index 5e485876f54c..fd76542c5977 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -580,6 +580,138 @@ static int pci_netmos_init(struct pci_dev *dev)
         return num_serial;
 }
 
+/*
+ * ITE support by Niels de Vos <niels.devos@wincor-nixdorf.com>
+ *
+ * These chips are available with optionally one parallel port and up to
+ * two serial ports. Unfortunately they all have the same product id.
+ *
+ * Basic configuration is done over a region of 32 I/O ports. The base
+ * ioport is called INTA or INTC, depending on docs/other drivers.
+ *
+ * The region of the 32 I/O ports is configured in POSIO0R...
+ */
+
+/* registers */
+#define ITE_887x_MISCR          0x9c
+#define ITE_887x_INTCBAR        0x78
+#define ITE_887x_UARTBAR        0x7c
+#define ITE_887x_PS0BAR         0x10
+#define ITE_887x_POSIO0         0x60
+
+/* I/O space size */
+#define ITE_887x_IOSIZE         32
+/* I/O space size (bits 26-24; 8 bytes = 011b) */
+#define ITE_887x_POSIO_IOSIZE_8         (3 << 24)
+/* I/O space size (bits 26-24; 32 bytes = 101b) */
+#define ITE_887x_POSIO_IOSIZE_32        (5 << 24)
+/* Decoding speed (1 = slow, 2 = medium, 3 = fast) */
+#define ITE_887x_POSIO_SPEED            (3 << 29)
+/* enable IO_Space bit */
+#define ITE_887x_POSIO_ENABLE           (1 << 31)
+
+static int __devinit pci_ite887x_init(struct pci_dev *dev)
+{
+        /* inta_addr are the configuration addresses of the ITE */
+        static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0,
+                                                        0x200, 0x280, 0 };
+        int ret, i, type;
+        struct resource *iobase = NULL;
+        u32 miscr, uartbar, ioport;
+
+        /* search for the base-ioport */
+        i = 0;
+        while (inta_addr[i] && iobase == NULL) {
+                iobase = request_region(inta_addr[i], ITE_887x_IOSIZE,
+                                                                "ite887x");
+                if (iobase != NULL) {
+                        /* write POSIO0R - speed | size | ioport */
+                        pci_write_config_dword(dev, ITE_887x_POSIO0,
+                                ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED |
+                                ITE_887x_POSIO_IOSIZE_32 | inta_addr[i]);
+                        /* write INTCBAR - ioport */
+                        pci_write_config_dword(dev, ITE_887x_INTCBAR, inta_addr[i]);
+                        ret = inb(inta_addr[i]);
+                        if (ret != 0xff) {
+                                /* ioport connected */
+                                break;
+                        }
+                        release_region(iobase->start, ITE_887x_IOSIZE);
+                        iobase = NULL;
+                }
+                i++;
+        }
+
+        if (!inta_addr[i]) {
+                printk(KERN_ERR "ite887x: could not find iobase\n");
+                return -ENODEV;
+        }
+
+        /* start of undocumented type checking (see parport_pc.c) */
+        type = inb(iobase->start + 0x18) & 0x0f;
+
+        switch (type) {
+        case 0x2:       /* ITE8871 (1P) */
+        case 0xa:       /* ITE8875 (1P) */
+                ret = 0;
+                break;
+        case 0xe:       /* ITE8872 (2S1P) */
+                ret = 2;
+                break;
+        case 0x6:       /* ITE8873 (1S) */
+                ret = 1;
+                break;
+        case 0x8:       /* ITE8874 (2S) */
+                ret = 2;
+                break;
+        default:
+                moan_device("Unknown ITE887x", dev);
+                ret = -ENODEV;
+        }
+
+        /* configure all serial ports */
+        for (i = 0; i < ret; i++) {
+                /* read the I/O port from the device */
+                pci_read_config_dword(dev, ITE_887x_PS0BAR + (0x4 * (i + 1)),
+                                                                &ioport);
+                ioport &= 0x0000FF00;   /* the actual base address */
+                pci_write_config_dword(dev, ITE_887x_POSIO0 + (0x4 * (i + 1)),
+                        ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED |
+                        ITE_887x_POSIO_IOSIZE_8 | ioport);
+
+                /* write the ioport to the UARTBAR */
+                pci_read_config_dword(dev, ITE_887x_UARTBAR, &uartbar);
+                uartbar &= ~(0xffff << (16 * i));       /* clear half the reg */
+                uartbar |= (ioport << (16 * i));        /* set the ioport */
+                pci_write_config_dword(dev, ITE_887x_UARTBAR, uartbar);
+
+                /* get current config */
+                pci_read_config_dword(dev, ITE_887x_MISCR, &miscr);
+                /* disable interrupts (UARTx_Routing[3:0]) */
+                miscr &= ~(0xf << (12 - 4 * i));
+                /* activate the UART (UARTx_En) */
+                miscr |= 1 << (23 - i);
+                /* write new config with activated UART */
+                pci_write_config_dword(dev, ITE_887x_MISCR, miscr);
+        }
+
+        if (ret <= 0) {
+                /* the device has no UARTs if we get here */
+                release_region(iobase->start, ITE_887x_IOSIZE);
+        }
+
+        return ret;
+}
+
+static void __devexit pci_ite887x_exit(struct pci_dev *dev)
+{
+        u32 ioport;
+        /* the ioport is bit 0-15 in POSIO0R */
+        pci_read_config_dword(dev, ITE_887x_POSIO0, &ioport);
+        ioport &= 0xffff;
+        release_region(ioport, ITE_887x_IOSIZE);
+}
+
 static int
 pci_default_setup(struct serial_private *priv, struct pciserial_board *board,
                   struct uart_port *port, int idx)
@@ -653,6 +785,18 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
                 .setup          = pci_default_setup,
         },
         /*
+         * ITE
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_ITE,
+                .device         = PCI_DEVICE_ID_ITE_8872,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ite887x_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ite887x_exit),
+        },
+        /*
          * Panacom
          */
         {
@@ -933,6 +1077,7 @@ enum pci_board_num_t {
 
         pbn_b1_2_1250000,
 
+        pbn_b1_bt_1_115200,
         pbn_b1_bt_2_921600,
 
         pbn_b1_1_1382400,
@@ -1211,6 +1356,13 @@ static struct pciserial_board pci_boards[] __devinitdata = {
                 .uart_offset    = 8,
         },
 
+        [pbn_b1_bt_1_115200] = {
+                .flags          = FL_BASE1|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
         [pbn_b1_bt_2_921600] = {
                 .flags          = FL_BASE1|FL_BASE_BARS,
                 .num_ports      = 2,
@@ -2364,6 +2516,13 @@ static struct pci_device_id serial_pci_tbl[] = {
         {       PCI_VENDOR_ID_TOPIC, PCI_DEVICE_ID_TOPIC_TP560,
                 PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                 pbn_b0_1_115200 },
+        /*
+         * ITE
+         */
+        {       PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8872,
+                PCI_ANY_ID, PCI_ANY_ID,
+                0, 0,
+                pbn_b1_bt_1_115200 },
 
         /*
          * IntaShield IS-200