[PATCH] Altix: ioc3 serial support

Add driver support for a 2 port PCI IOC3-based serial card on Altix boxes:

This is a re-submission.  On the original submission I was asked to
organize the code so that the MIPS ioc3 ethernet and serial parts could be
used with this driver.  Stanislaw Skowronek was kind enough to provide the
shim layer for this - thanks Stanislaw.  This patch includes the shim layer
and the Altix PCI ioc3 serial driver.  The MIPS merged ioc3 ethernet and
serial support is forthcoming.

Signed-off-by: Patrick Gefre <pfg@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 334 insertions, 0 deletions

diff --git a/include/asm-ia64/sn/ioc3.h b/include/asm-ia64/sn/ioc3.h
new file mode 100644
index 000000000000..95ed6cc83cf1
--- /dev/null
+++ b/include/asm-ia64/sn/ioc3.h
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2005 Silicon Graphics, Inc.
+ */
+#ifndef IA64_SN_IOC3_H
+#define IA64_SN_IOC3_H
+
+/* serial port register map */
+struct ioc3_serialregs {
+        uint32_t sscr;
+        uint32_t stpir;
+        uint32_t stcir;
+        uint32_t srpir;
+        uint32_t srcir;
+        uint32_t srtr;
+        uint32_t shadow;
+};
+
+/* SUPERIO uart register map */
+struct ioc3_uartregs {
+        char iu_lcr;
+        union {
+                char iir;       /* read only */
+                char fcr;       /* write only */
+        } u3;
+        union {
+                char ier;       /* DLAB == 0 */
+                char dlm;       /* DLAB == 1 */
+        } u2;
+        union {
+                char rbr;       /* read only, DLAB == 0 */
+                char thr;       /* write only, DLAB == 0 */
+                char dll;       /* DLAB == 1 */
+        } u1;
+        char iu_scr;
+        char iu_msr;
+        char iu_lsr;
+        char iu_mcr;
+};
+
+#define iu_rbr u1.rbr
+#define iu_thr u1.thr
+#define iu_dll u1.dll
+#define iu_ier u2.ier
+#define iu_dlm u2.dlm
+#define iu_iir u3.iir
+#define iu_fcr u3.fcr
+
+struct ioc3_sioregs {
+        char fill[0x170];
+        struct ioc3_uartregs uartb;
+        struct ioc3_uartregs uarta;
+};
+
+/* PCI IO/mem space register map */
+struct ioc3 {
+        uint32_t pci_id;
+        uint32_t pci_scr;
+        uint32_t pci_rev;
+        uint32_t pci_lat;
+        uint32_t pci_addr;
+        uint32_t pci_err_addr_l;
+        uint32_t pci_err_addr_h;
+
+        uint32_t sio_ir;
+        /* these registers are read-only for general kernel code. To
+         * modify them use the functions in ioc3.c
+         */
+        uint32_t sio_ies;
+        uint32_t sio_iec;
+        uint32_t sio_cr;
+        uint32_t int_out;
+        uint32_t mcr;
+        uint32_t gpcr_s;
+        uint32_t gpcr_c;
+        uint32_t gpdr;
+        uint32_t gppr[9];
+        char fill[0x4c];
+
+        /* serial port registers */
+        uint32_t sbbr_h;
+        uint32_t sbbr_l;
+
+        struct ioc3_serialregs port_a;
+        struct ioc3_serialregs port_b;
+        char fill1[0x1ff10];
+        /* superio registers */
+        struct ioc3_sioregs sregs;
+};
+
+/* These don't exist on the ioc3 serial card... */
+#define eier    fill1[8]
+#define eisr    fill1[4]
+
+#define PCI_LAT                 0xc     /* Latency Timer */
+#define PCI_SCR_DROP_MODE_EN    0x00008000 /* drop pios on parity err */
+#define UARTA_BASE              0x178
+#define UARTB_BASE              0x170
+
+
+/* bitmasks for serial RX status byte */
+#define RXSB_OVERRUN            0x01    /* char(s) lost */
+#define RXSB_PAR_ERR            0x02    /* parity error */
+#define RXSB_FRAME_ERR          0x04    /* framing error */
+#define RXSB_BREAK              0x08    /* break character */
+#define RXSB_CTS                0x10    /* state of CTS */
+#define RXSB_DCD                0x20    /* state of DCD */
+#define RXSB_MODEM_VALID        0x40    /* DCD, CTS and OVERRUN are valid */
+#define RXSB_DATA_VALID         0x80    /* FRAME_ERR PAR_ERR & BREAK valid */
+
+/* bitmasks for serial TX control byte */
+#define TXCB_INT_WHEN_DONE      0x20    /* interrupt after this byte is sent */
+#define TXCB_INVALID            0x00    /* byte is invalid */
+#define TXCB_VALID              0x40    /* byte is valid */
+#define TXCB_MCR                0x80    /* data<7:0> to modem cntrl register */
+#define TXCB_DELAY              0xc0    /* delay data<7:0> mSec */
+
+/* bitmasks for SBBR_L */
+#define SBBR_L_SIZE             0x00000001      /* 0 1KB rings, 1 4KB rings */
+
+/* bitmasks for SSCR_<A:B> */
+#define SSCR_RX_THRESHOLD       0x000001ff      /* hiwater mark */
+#define SSCR_TX_TIMER_BUSY      0x00010000      /* TX timer in progress */
+#define SSCR_HFC_EN             0x00020000      /* h/w flow cntrl enabled */
+#define SSCR_RX_RING_DCD        0x00040000      /* postRX record on delta-DCD */
+#define SSCR_RX_RING_CTS        0x00080000      /* postRX record on delta-CTS */
+#define SSCR_HIGH_SPD           0x00100000      /* 4X speed */
+#define SSCR_DIAG               0x00200000      /* bypass clock divider */
+#define SSCR_RX_DRAIN           0x08000000      /* drain RX buffer to memory */
+#define SSCR_DMA_EN             0x10000000      /* enable ring buffer DMA */
+#define SSCR_DMA_PAUSE          0x20000000      /* pause DMA */
+#define SSCR_PAUSE_STATE        0x40000000      /* set when PAUSE takes effect*/
+#define SSCR_RESET              0x80000000      /* reset DMA channels */
+
+/* all producer/comsumer pointers are the same bitfield */
+#define PROD_CONS_PTR_4K        0x00000ff8      /* for 4K buffers */
+#define PROD_CONS_PTR_1K        0x000003f8      /* for 1K buffers */
+#define PROD_CONS_PTR_OFF       3
+
+/* bitmasks for SRCIR_<A:B> */
+#define SRCIR_ARM               0x80000000      /* arm RX timer */
+
+/* bitmasks for SHADOW_<A:B> */
+#define SHADOW_DR               0x00000001      /* data ready */
+#define SHADOW_OE               0x00000002      /* overrun error */
+#define SHADOW_PE               0x00000004      /* parity error */
+#define SHADOW_FE               0x00000008      /* framing error */
+#define SHADOW_BI               0x00000010      /* break interrupt */
+#define SHADOW_THRE             0x00000020      /* transmit holding reg empty */
+#define SHADOW_TEMT             0x00000040      /* transmit shift reg empty */
+#define SHADOW_RFCE             0x00000080      /* char in RX fifo has error */
+#define SHADOW_DCTS             0x00010000      /* delta clear to send */
+#define SHADOW_DDCD             0x00080000      /* delta data carrier detect */
+#define SHADOW_CTS              0x00100000      /* clear to send */
+#define SHADOW_DCD              0x00800000      /* data carrier detect */
+#define SHADOW_DTR              0x01000000      /* data terminal ready */
+#define SHADOW_RTS              0x02000000      /* request to send */
+#define SHADOW_OUT1             0x04000000      /* 16550 OUT1 bit */
+#define SHADOW_OUT2             0x08000000      /* 16550 OUT2 bit */
+#define SHADOW_LOOP             0x10000000      /* loopback enabled */
+
+/* bitmasks for SRTR_<A:B> */
+#define SRTR_CNT                0x00000fff      /* reload value for RX timer */
+#define SRTR_CNT_VAL            0x0fff0000      /* current value of RX timer */
+#define SRTR_CNT_VAL_SHIFT      16
+#define SRTR_HZ                 16000           /* SRTR clock frequency */
+
+/* bitmasks for SIO_IR, SIO_IEC and SIO_IES  */
+#define SIO_IR_SA_TX_MT         0x00000001      /* Serial port A TX empty */
+#define SIO_IR_SA_RX_FULL       0x00000002      /* port A RX buf full */
+#define SIO_IR_SA_RX_HIGH       0x00000004      /* port A RX hiwat */
+#define SIO_IR_SA_RX_TIMER      0x00000008      /* port A RX timeout */
+#define SIO_IR_SA_DELTA_DCD     0x00000010      /* port A delta DCD */
+#define SIO_IR_SA_DELTA_CTS     0x00000020      /* port A delta CTS */
+#define SIO_IR_SA_INT           0x00000040      /* port A pass-thru intr */
+#define SIO_IR_SA_TX_EXPLICIT   0x00000080      /* port A explicit TX thru */
+#define SIO_IR_SA_MEMERR        0x00000100      /* port A PCI error */
+#define SIO_IR_SB_TX_MT         0x00000200
+#define SIO_IR_SB_RX_FULL       0x00000400
+#define SIO_IR_SB_RX_HIGH       0x00000800
+#define SIO_IR_SB_RX_TIMER      0x00001000
+#define SIO_IR_SB_DELTA_DCD     0x00002000
+#define SIO_IR_SB_DELTA_CTS     0x00004000
+#define SIO_IR_SB_INT           0x00008000
+#define SIO_IR_SB_TX_EXPLICIT   0x00010000
+#define SIO_IR_SB_MEMERR        0x00020000
+#define SIO_IR_PP_INT           0x00040000      /* P port pass-thru intr */
+#define SIO_IR_PP_INTA          0x00080000      /* PP context A thru */
+#define SIO_IR_PP_INTB          0x00100000      /* PP context B thru */
+#define SIO_IR_PP_MEMERR        0x00200000      /* PP PCI error */
+#define SIO_IR_KBD_INT          0x00400000      /* kbd/mouse intr */
+#define SIO_IR_RT_INT           0x08000000      /* RT output pulse */
+#define SIO_IR_GEN_INT1         0x10000000      /* RT input pulse */
+#define SIO_IR_GEN_INT_SHIFT    28
+
+/* per device interrupt masks */
+#define SIO_IR_SA               (SIO_IR_SA_TX_MT | \
+                                 SIO_IR_SA_RX_FULL | \
+                                 SIO_IR_SA_RX_HIGH | \
+                                 SIO_IR_SA_RX_TIMER | \
+                                 SIO_IR_SA_DELTA_DCD | \
+                                 SIO_IR_SA_DELTA_CTS | \
+                                 SIO_IR_SA_INT | \
+                                 SIO_IR_SA_TX_EXPLICIT | \
+                                 SIO_IR_SA_MEMERR)
+
+#define SIO_IR_SB               (SIO_IR_SB_TX_MT | \
+                                 SIO_IR_SB_RX_FULL | \
+                                 SIO_IR_SB_RX_HIGH | \
+                                 SIO_IR_SB_RX_TIMER | \
+                                 SIO_IR_SB_DELTA_DCD | \
+                                 SIO_IR_SB_DELTA_CTS | \
+                                 SIO_IR_SB_INT | \
+                                 SIO_IR_SB_TX_EXPLICIT | \
+                                 SIO_IR_SB_MEMERR)
+
+#define SIO_IR_PP               (SIO_IR_PP_INT | SIO_IR_PP_INTA | \
+                                 SIO_IR_PP_INTB | SIO_IR_PP_MEMERR)
+#define SIO_IR_RT               (SIO_IR_RT_INT | SIO_IR_GEN_INT1)
+
+/* bitmasks for SIO_CR */
+#define SIO_CR_CMD_PULSE_SHIFT 15
+#define SIO_CR_SER_A_BASE_SHIFT 1
+#define SIO_CR_SER_B_BASE_SHIFT 8
+#define SIO_CR_ARB_DIAG         0x00380000      /* cur !enet PCI requet (ro) */
+#define SIO_CR_ARB_DIAG_TXA     0x00000000
+#define SIO_CR_ARB_DIAG_RXA     0x00080000
+#define SIO_CR_ARB_DIAG_TXB     0x00100000
+#define SIO_CR_ARB_DIAG_RXB     0x00180000
+#define SIO_CR_ARB_DIAG_PP      0x00200000
+#define SIO_CR_ARB_DIAG_IDLE    0x00400000      /* 0 -> active request (ro) */
+
+/* defs for some of the generic I/O pins */
+#define GPCR_PHY_RESET          0x20    /* pin is output to PHY reset */
+#define GPCR_UARTB_MODESEL      0x40    /* pin is output to port B mode sel */
+#define GPCR_UARTA_MODESEL      0x80    /* pin is output to port A mode sel */
+
+#define GPPR_PHY_RESET_PIN      5       /* GIO pin controlling phy reset */
+#define GPPR_UARTB_MODESEL_PIN  6       /* GIO pin cntrling uartb modeselect */
+#define GPPR_UARTA_MODESEL_PIN  7       /* GIO pin cntrling uarta modeselect */
+
+#endif /* IA64_SN_IOC3_H */
diff --git a/include/linux/ioc3.h b/include/linux/ioc3.h
new file mode 100644
index 000000000000..e7906a72a4f1
--- /dev/null
+++ b/include/linux/ioc3.h
@@ -0,0 +1,93 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2005 Stanislaw Skowronek <skylark@linux-mips.org>
+ */
+
+#ifndef _LINUX_IOC3_H
+#define _LINUX_IOC3_H
+
+#include <asm/sn/ioc3.h>
+
+#define IOC3_MAX_SUBMODULES     32
+
+#define IOC3_CLASS_NONE         0
+#define IOC3_CLASS_BASE_IP27    1
+#define IOC3_CLASS_BASE_IP30    2
+#define IOC3_CLASS_MENET_123    3
+#define IOC3_CLASS_MENET_4      4
+#define IOC3_CLASS_CADDUO       5
+#define IOC3_CLASS_SERIAL       6
+
+/* One of these per IOC3 */
+struct ioc3_driver_data {
+        struct list_head list;
+        int id;                         /* IOC3 sequence number */
+        /* PCI mapping */
+        unsigned long pma;              /* physical address */
+        struct __iomem ioc3 *vma;       /* pointer to registers */
+        struct pci_dev *pdev;           /* PCI device */
+        /* IRQ stuff */
+        int dual_irq;                   /* set if separate IRQs are used */
+        int irq_io, irq_eth;            /* IRQ numbers */
+        /* GPIO magic */
+        spinlock_t gpio_lock;
+        unsigned int gpdr_shadow;
+        /* NIC identifiers */
+        char nic_part[32];
+        char nic_serial[16];
+        char nic_mac[6];
+        /* submodule set */
+        int class;
+        void *data[IOC3_MAX_SUBMODULES];        /* for submodule use */
+        int active[IOC3_MAX_SUBMODULES];        /* set if probe succeeds */
+        /* is_ir_lock must be held while
+         * modifying sio_ie values, so
+         * we can be sure that sio_ie is
+         * not changing when we read it
+         * along with sio_ir.
+         */
+        spinlock_t ir_lock;     /* SIO_IE[SC] mod lock */
+};
+
+/* One per submodule */
+struct ioc3_submodule {
+        char *name;             /* descriptive submodule name */
+        struct module *owner;   /* owning kernel module */
+        int ethernet;           /* set for ethernet drivers */
+        int (*probe) (struct ioc3_submodule *, struct ioc3_driver_data *);
+        int (*remove) (struct ioc3_submodule *, struct ioc3_driver_data *);
+        int id;                 /* assigned by IOC3, index for the "data" array */
+        /* IRQ stuff */
+        unsigned int irq_mask;  /* IOC3 IRQ mask, leave clear for Ethernet */
+        int reset_mask;         /* non-zero if you want the ioc3.c module to reset interrupts */
+        int (*intr) (struct ioc3_submodule *, struct ioc3_driver_data *, unsigned int, struct pt_regs *);
+        /* private submodule data */
+        void *data;             /* assigned by submodule */
+};
+
+/**********************************
+ * Functions needed by submodules *
+ **********************************/
+
+#define IOC3_W_IES              0
+#define IOC3_W_IEC              1
+
+/* registers a submodule for all existing and future IOC3 chips */
+extern int ioc3_register_submodule(struct ioc3_submodule *);
+/* unregisters a submodule */
+extern void ioc3_unregister_submodule(struct ioc3_submodule *);
+/* enables IRQs indicated by irq_mask for a specified IOC3 chip */
+extern void ioc3_enable(struct ioc3_submodule *, struct ioc3_driver_data *, unsigned int);
+/* ackowledges specified IRQs */
+extern void ioc3_ack(struct ioc3_submodule *, struct ioc3_driver_data *, unsigned int);
+/* disables IRQs indicated by irq_mask for a specified IOC3 chip */
+extern void ioc3_disable(struct ioc3_submodule *, struct ioc3_driver_data *, unsigned int);
+/* atomically sets GPCR bits */
+extern void ioc3_gpcr_set(struct ioc3_driver_data *, unsigned int);
+/* general ireg writer */
+extern void ioc3_write_ireg(struct ioc3_driver_data *idd, uint32_t value, int reg);
+
+#endif