793 lines
27 KiB
C
793 lines
27 KiB
C
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/*********************************************************************
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*
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* vlsi_ir.h: VLSI82C147 PCI IrDA controller driver for Linux
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*
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* Version: 0.5
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*
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* Copyright (c) 2001-2003 Martin Diehl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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********************************************************************/
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#ifndef IRDA_VLSI_FIR_H
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#define IRDA_VLSI_FIR_H
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/* ================================================================
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* compatibility stuff
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*/
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/* definitions not present in pci_ids.h */
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#ifndef PCI_CLASS_WIRELESS_IRDA
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#define PCI_CLASS_WIRELESS_IRDA 0x0d00
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#endif
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#ifndef PCI_CLASS_SUBCLASS_MASK
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#define PCI_CLASS_SUBCLASS_MASK 0xffff
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#endif
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/* in recent 2.5 interrupt handlers have non-void return value */
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#ifndef IRQ_RETVAL
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typedef void irqreturn_t;
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#define IRQ_NONE
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#define IRQ_HANDLED
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#define IRQ_RETVAL(x)
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#endif
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/* some stuff need to check kernelversion. Not all 2.5 stuff was present
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* in early 2.5.x - the test is merely to separate 2.4 from 2.5
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*/
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
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/* PDE() introduced in 2.5.4 */
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#ifdef CONFIG_PROC_FS
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#define PDE(inode) ((inode)->i_private)
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#endif
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/* irda crc16 calculation exported in 2.5.42 */
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#define irda_calc_crc16(fcs,buf,len) (GOOD_FCS)
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/* we use this for unified pci device name access */
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#define PCIDEV_NAME(pdev) ((pdev)->name)
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#else /* 2.5 or later */
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/* whatever we get from the associated struct device - bus:slot:dev.fn id */
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#define PCIDEV_NAME(pdev) (pci_name(pdev))
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#endif
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/* ================================================================ */
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/* non-standard PCI registers */
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enum vlsi_pci_regs {
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VLSI_PCI_CLKCTL = 0x40, /* chip clock input control */
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VLSI_PCI_MSTRPAGE = 0x41, /* addr [31:24] for all busmaster cycles */
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VLSI_PCI_IRMISC = 0x42 /* mainly legacy UART related */
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};
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/* ------------------------------------------ */
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/* VLSI_PCI_CLKCTL: Clock Control Register (u8, rw) */
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/* Three possible clock sources: either on-chip 48MHz PLL or
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* external clock applied to EXTCLK pin. External clock may
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* be either 48MHz or 40MHz, which is indicated by XCKSEL.
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* CLKSTP controls whether the selected clock source gets
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* connected to the IrDA block.
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*
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* On my HP OB-800 the BIOS sets external 40MHz clock as source
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* when IrDA enabled and I've never detected any PLL lock success.
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* Apparently the 14.3...MHz OSC input required for the PLL to work
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* is not connected and the 40MHz EXTCLK is provided externally.
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* At least this is what makes the driver working for me.
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*/
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enum vlsi_pci_clkctl {
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/* PLL control */
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CLKCTL_PD_INV = 0x04, /* PD#: inverted power down signal,
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* i.e. PLL is powered, if PD_INV set */
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CLKCTL_LOCK = 0x40, /* (ro) set, if PLL is locked */
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/* clock source selection */
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CLKCTL_EXTCLK = 0x20, /* set to select external clock input, not PLL */
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CLKCTL_XCKSEL = 0x10, /* set to indicate EXTCLK is 40MHz, not 48MHz */
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/* IrDA block control */
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CLKCTL_CLKSTP = 0x80, /* set to disconnect from selected clock source */
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CLKCTL_WAKE = 0x08 /* set to enable wakeup feature: whenever IR activity
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* is detected, PD_INV gets set(?) and CLKSTP cleared */
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};
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/* ------------------------------------------ */
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/* VLSI_PCI_MSTRPAGE: Master Page Register (u8, rw) and busmastering stuff */
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#define DMA_MASK_USED_BY_HW 0xffffffff
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#define DMA_MASK_MSTRPAGE 0x00ffffff
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#define MSTRPAGE_VALUE (DMA_MASK_MSTRPAGE >> 24)
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/* PCI busmastering is somewhat special for this guy - in short:
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*
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* We select to operate using fixed MSTRPAGE=0, use ISA DMA
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* address restrictions to make the PCI BM api aware of this,
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* but ensure the hardware is dealing with real 32bit access.
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*
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* In detail:
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* The chip executes normal 32bit busmaster cycles, i.e.
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* drives all 32 address lines. These addresses however are
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* composed of [0:23] taken from various busaddr-pointers
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* and [24:31] taken from the MSTRPAGE register in the VLSI82C147
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* config space. Therefore _all_ busmastering must be
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* targeted to/from one single 16MB (busaddr-) superpage!
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* The point is to make sure all the allocations for memory
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* locations with busmaster access (ring descriptors, buffers)
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* are indeed bus-mappable to the same 16MB range (for x86 this
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* means they must reside in the same 16MB physical memory address
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* range). The only constraint we have which supports "several objects
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* mappable to common 16MB range" paradigma, is the old ISA DMA
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* restriction to the first 16MB of physical address range.
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* Hence the approach here is to enable PCI busmaster support using
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* the correct 32bit dma-mask used by the chip. Afterwards the device's
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* dma-mask gets restricted to 24bit, which must be honoured somehow by
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* all allocations for memory areas to be exposed to the chip ...
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*
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* Note:
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* Don't be surprised to get "Setting latency timer..." messages every
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* time when PCI busmastering is enabled for the chip.
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* The chip has its PCI latency timer RO fixed at 0 - which is not a
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* problem here, because it is never requesting _burst_ transactions.
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*/
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/* ------------------------------------------ */
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/* VLSI_PCIIRMISC: IR Miscellaneous Register (u8, rw) */
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/* legacy UART emulation - not used by this driver - would require:
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* (see below for some register-value definitions)
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*
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* - IRMISC_UARTEN must be set to enable UART address decoding
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* - IRMISC_UARTSEL configured
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* - IRCFG_MASTER must be cleared
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* - IRCFG_SIR must be set
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* - IRENABLE_PHYANDCLOCK must be asserted 0->1 (and hence IRENABLE_SIR_ON)
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*/
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enum vlsi_pci_irmisc {
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/* IR transceiver control */
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IRMISC_IRRAIL = 0x40, /* (ro?) IR rail power indication (and control?)
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* 0=3.3V / 1=5V. Probably set during power-on?
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* unclear - not touched by driver */
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IRMISC_IRPD = 0x08, /* transceiver power down, if set */
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/* legacy UART control */
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IRMISC_UARTTST = 0x80, /* UART test mode - "always write 0" */
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IRMISC_UARTEN = 0x04, /* enable UART address decoding */
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/* bits [1:0] IRMISC_UARTSEL to select legacy UART address */
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IRMISC_UARTSEL_3f8 = 0x00,
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IRMISC_UARTSEL_2f8 = 0x01,
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IRMISC_UARTSEL_3e8 = 0x02,
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IRMISC_UARTSEL_2e8 = 0x03
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};
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/* ================================================================ */
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/* registers mapped to 32 byte PCI IO space */
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/* note: better access all registers at the indicated u8/u16 size
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* although some of them contain only 1 byte of information.
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* some of them (particaluarly PROMPT and IRCFG) ignore
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* access when using the wrong addressing mode!
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*/
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enum vlsi_pio_regs {
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VLSI_PIO_IRINTR = 0x00, /* interrupt enable/request (u8, rw) */
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VLSI_PIO_RINGPTR = 0x02, /* rx/tx ring pointer (u16, ro) */
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VLSI_PIO_RINGBASE = 0x04, /* [23:10] of ring address (u16, rw) */
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VLSI_PIO_RINGSIZE = 0x06, /* rx/tx ring size (u16, rw) */
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VLSI_PIO_PROMPT = 0x08, /* triggers ring processing (u16, wo) */
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/* 0x0a-0x0f: reserved / duplicated UART regs */
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VLSI_PIO_IRCFG = 0x10, /* configuration select (u16, rw) */
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VLSI_PIO_SIRFLAG = 0x12, /* BOF/EOF for filtered SIR (u16, ro) */
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VLSI_PIO_IRENABLE = 0x14, /* enable and status register (u16, rw/ro) */
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VLSI_PIO_PHYCTL = 0x16, /* physical layer current status (u16, ro) */
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VLSI_PIO_NPHYCTL = 0x18, /* next physical layer select (u16, rw) */
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VLSI_PIO_MAXPKT = 0x1a, /* [11:0] max len for packet receive (u16, rw) */
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VLSI_PIO_RCVBCNT = 0x1c /* current receive-FIFO byte count (u16, ro) */
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/* 0x1e-0x1f: reserved / duplicated UART regs */
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};
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/* ------------------------------------------ */
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/* VLSI_PIO_IRINTR: Interrupt Register (u8, rw) */
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/* enable-bits:
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* 1 = enable / 0 = disable
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* interrupt condition bits:
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* set according to corresponding interrupt source
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* (regardless of the state of the enable bits)
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* enable bit status indicates whether interrupt gets raised
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* write-to-clear
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* note: RPKTINT and TPKTINT behave different in legacy UART mode (which we don't use :-)
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*/
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enum vlsi_pio_irintr {
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IRINTR_ACTEN = 0x80, /* activity interrupt enable */
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IRINTR_ACTIVITY = 0x40, /* activity monitor (traffic detected) */
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IRINTR_RPKTEN = 0x20, /* receive packet interrupt enable*/
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IRINTR_RPKTINT = 0x10, /* rx-packet transfered from fifo to memory finished */
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IRINTR_TPKTEN = 0x08, /* transmit packet interrupt enable */
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IRINTR_TPKTINT = 0x04, /* last bit of tx-packet+crc shifted to ir-pulser */
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IRINTR_OE_EN = 0x02, /* UART rx fifo overrun error interrupt enable */
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IRINTR_OE_INT = 0x01 /* UART rx fifo overrun error (read LSR to clear) */
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};
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/* we use this mask to check whether the (shared PCI) interrupt is ours */
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#define IRINTR_INT_MASK (IRINTR_ACTIVITY|IRINTR_RPKTINT|IRINTR_TPKTINT)
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/* ------------------------------------------ */
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/* VLSI_PIO_RINGPTR: Ring Pointer Read-Back Register (u16, ro) */
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/* _both_ ring pointers are indices relative to the _entire_ rx,tx-ring!
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* i.e. the referenced descriptor is located
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* at RINGBASE + PTR * sizeof(descr) for rx and tx
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* therefore, the tx-pointer has offset MAX_RING_DESCR
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*/
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#define MAX_RING_DESCR 64 /* tx, rx rings may contain up to 64 descr each */
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#define RINGPTR_RX_MASK (MAX_RING_DESCR-1)
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#define RINGPTR_TX_MASK ((MAX_RING_DESCR-1)<<8)
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#define RINGPTR_GET_RX(p) ((p)&RINGPTR_RX_MASK)
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#define RINGPTR_GET_TX(p) (((p)&RINGPTR_TX_MASK)>>8)
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/* ------------------------------------------ */
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/* VLSI_PIO_RINGBASE: Ring Pointer Base Address Register (u16, ro) */
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/* Contains [23:10] part of the ring base (bus-) address
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* which must be 1k-alinged. [31:24] is taken from
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* VLSI_PCI_MSTRPAGE above.
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* The controller initiates non-burst PCI BM cycles to
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* fetch and update the descriptors in the ring.
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* Once fetched, the descriptor remains cached onchip
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* until it gets closed and updated due to the ring
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* processing state machine.
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* The entire ring area is split in rx and tx areas with each
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* area consisting of 64 descriptors of 8 bytes each.
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* The rx(tx) ring is located at ringbase+0 (ringbase+64*8).
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*/
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#define BUS_TO_RINGBASE(p) (((p)>>10)&0x3fff)
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/* ------------------------------------------ */
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/* VLSI_PIO_RINGSIZE: Ring Size Register (u16, rw) */
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/* bit mask to indicate the ring size to be used for rx and tx.
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* possible values encoded bits
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* 4 0000
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* 8 0001
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* 16 0011
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* 32 0111
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* 64 1111
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* located at [15:12] for tx and [11:8] for rx ([7:0] unused)
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*
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* note: probably a good idea to have IRCFG_MSTR cleared when writing
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* this so the state machines are stopped and the RINGPTR is reset!
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*/
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#define SIZE_TO_BITS(num) ((((num)-1)>>2)&0x0f)
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#define TX_RX_TO_RINGSIZE(tx,rx) ((SIZE_TO_BITS(tx)<<12)|(SIZE_TO_BITS(rx)<<8))
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#define RINGSIZE_TO_RXSIZE(rs) ((((rs)&0x0f00)>>6)+4)
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#define RINGSIZE_TO_TXSIZE(rs) ((((rs)&0xf000)>>10)+4)
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/* ------------------------------------------ */
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/* VLSI_PIO_PROMPT: Ring Prompting Register (u16, write-to-start) */
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/* writing any value kicks the ring processing state machines
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* for both tx, rx rings as follows:
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* - active rings (currently owning an active descriptor)
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* ignore the prompt and continue
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* - idle rings fetch the next descr from the ring and start
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* their processing
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*/
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/* ------------------------------------------ */
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/* VLSI_PIO_IRCFG: IR Config Register (u16, rw) */
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/* notes:
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* - not more than one SIR/MIR/FIR bit must be set at any time
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* - SIR, MIR, FIR and CRC16 select the configuration which will
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* be applied on next 0->1 transition of IRENABLE_PHYANDCLOCK (see below).
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* - besides allowing the PCI interface to execute busmaster cycles
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* and therefore the ring SM to operate, the MSTR bit has side-effects:
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* when MSTR is cleared, the RINGPTR's get reset and the legacy UART mode
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* (in contrast to busmaster access mode) gets enabled.
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* - clearing ENRX or setting ENTX while data is received may stall the
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* receive fifo until ENRX reenabled _and_ another packet arrives
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* - SIRFILT means the chip performs the required unwrapping of hardware
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* headers (XBOF's, BOF/EOF) and un-escaping in the _receive_ direction.
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* Only the resulting IrLAP payload is copied to the receive buffers -
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* but with the 16bit FCS still encluded. Question remains, whether it
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* was already checked or we should do it before passing the packet to IrLAP?
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*/
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enum vlsi_pio_ircfg {
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IRCFG_LOOP = 0x4000, /* enable loopback test mode */
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IRCFG_ENTX = 0x1000, /* transmit enable */
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IRCFG_ENRX = 0x0800, /* receive enable */
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IRCFG_MSTR = 0x0400, /* master enable */
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IRCFG_RXANY = 0x0200, /* receive any packet */
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IRCFG_CRC16 = 0x0080, /* 16bit (not 32bit) CRC select for MIR/FIR */
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IRCFG_FIR = 0x0040, /* FIR 4PPM encoding mode enable */
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IRCFG_MIR = 0x0020, /* MIR HDLC encoding mode enable */
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IRCFG_SIR = 0x0010, /* SIR encoding mode enable */
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IRCFG_SIRFILT = 0x0008, /* enable SIR decode filter (receiver unwrapping) */
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IRCFG_SIRTEST = 0x0004, /* allow SIR decode filter when not in SIR mode */
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IRCFG_TXPOL = 0x0002, /* invert tx polarity when set */
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IRCFG_RXPOL = 0x0001 /* invert rx polarity when set */
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};
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/* ------------------------------------------ */
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/* VLSI_PIO_SIRFLAG: SIR Flag Register (u16, ro) */
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/* register contains hardcoded BOF=0xc0 at [7:0] and EOF=0xc1 at [15:8]
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* which is used for unwrapping received frames in SIR decode-filter mode
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*/
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/* ------------------------------------------ */
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/* VLSI_PIO_IRENABLE: IR Enable Register (u16, rw/ro) */
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/* notes:
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* - IREN acts as gate for latching the configured IR mode information
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* from IRCFG and IRPHYCTL when IREN=reset and applying them when
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* IREN gets set afterwards.
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* - ENTXST reflects IRCFG_ENTX
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* - ENRXST = IRCFG_ENRX && (!IRCFG_ENTX || IRCFG_LOOP)
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*/
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enum vlsi_pio_irenable {
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IRENABLE_PHYANDCLOCK = 0x8000, /* enable IR phy and gate the mode config (rw) */
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IRENABLE_CFGER = 0x4000, /* mode configuration error (ro) */
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IRENABLE_FIR_ON = 0x2000, /* FIR on status (ro) */
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IRENABLE_MIR_ON = 0x1000, /* MIR on status (ro) */
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IRENABLE_SIR_ON = 0x0800, /* SIR on status (ro) */
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IRENABLE_ENTXST = 0x0400, /* transmit enable status (ro) */
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IRENABLE_ENRXST = 0x0200, /* Receive enable status (ro) */
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IRENABLE_CRC16_ON = 0x0100 /* 16bit (not 32bit) CRC enabled status (ro) */
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};
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#define IRENABLE_MASK 0xff00 /* Read mask */
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/* ------------------------------------------ */
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/* VLSI_PIO_PHYCTL: IR Physical Layer Current Control Register (u16, ro) */
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/* read-back of the currently applied physical layer status.
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* applied from VLSI_PIO_NPHYCTL at rising edge of IRENABLE_PHYANDCLOCK
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* contents identical to VLSI_PIO_NPHYCTL (see below)
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*/
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/* ------------------------------------------ */
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/* VLSI_PIO_NPHYCTL: IR Physical Layer Next Control Register (u16, rw) */
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/* latched during IRENABLE_PHYANDCLOCK=0 and applied at 0-1 transition
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*
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* consists of BAUD[15:10], PLSWID[9:5] and PREAMB[4:0] bits defined as follows:
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*
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* SIR-mode: BAUD = (115.2kHz / baudrate) - 1
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* PLSWID = (pulsetime * freq / (BAUD+1)) - 1
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* where pulsetime is the requested IrPHY pulse width
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* and freq is 8(16)MHz for 40(48)MHz primary input clock
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* PREAMB: don't care for SIR
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*
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* The nominal SIR pulse width is 3/16 bit time so we have PLSWID=12
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* fixed for all SIR speeds at 40MHz input clock (PLSWID=24 at 48MHz).
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* IrPHY also allows shorter pulses down to the nominal pulse duration
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* at 115.2kbaud (minus some tolerance) which is 1.41 usec.
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* Using the expression PLSWID = 12/(BAUD+1)-1 (multiplied by two for 48MHz)
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* we get the minimum acceptable PLSWID values according to the VLSI
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* specification, which provides 1.5 usec pulse width for all speeds (except
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* for 2.4kbaud getting 6usec). This is fine with IrPHY v1.3 specs and
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* reduces the transceiver power which drains the battery. At 9.6kbaud for
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* example this amounts to more than 90% battery power saving!
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*
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* MIR-mode: BAUD = 0
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* PLSWID = 9(10) for 40(48) MHz input clock
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* to get nominal MIR pulse width
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* PREAMB = 1
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*
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* FIR-mode: BAUD = 0
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* PLSWID: don't care
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* PREAMB = 15
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*/
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#define PHYCTL_BAUD_SHIFT 10
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#define PHYCTL_BAUD_MASK 0xfc00
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#define PHYCTL_PLSWID_SHIFT 5
|
|
#define PHYCTL_PLSWID_MASK 0x03e0
|
|
#define PHYCTL_PREAMB_SHIFT 0
|
|
#define PHYCTL_PREAMB_MASK 0x001f
|
|
|
|
#define PHYCTL_TO_BAUD(bwp) (((bwp)&PHYCTL_BAUD_MASK)>>PHYCTL_BAUD_SHIFT)
|
|
#define PHYCTL_TO_PLSWID(bwp) (((bwp)&PHYCTL_PLSWID_MASK)>>PHYCTL_PLSWID_SHIFT)
|
|
#define PHYCTL_TO_PREAMB(bwp) (((bwp)&PHYCTL_PREAMB_MASK)>>PHYCTL_PREAMB_SHIFT)
|
|
|
|
#define BWP_TO_PHYCTL(b,w,p) ((((b)<<PHYCTL_BAUD_SHIFT)&PHYCTL_BAUD_MASK) \
|
|
| (((w)<<PHYCTL_PLSWID_SHIFT)&PHYCTL_PLSWID_MASK) \
|
|
| (((p)<<PHYCTL_PREAMB_SHIFT)&PHYCTL_PREAMB_MASK))
|
|
|
|
#define BAUD_BITS(br) ((115200/(br))-1)
|
|
|
|
static inline unsigned
|
|
calc_width_bits(unsigned baudrate, unsigned widthselect, unsigned clockselect)
|
|
{
|
|
unsigned tmp;
|
|
|
|
if (widthselect) /* nominal 3/16 puls width */
|
|
return (clockselect) ? 12 : 24;
|
|
|
|
tmp = ((clockselect) ? 12 : 24) / (BAUD_BITS(baudrate)+1);
|
|
|
|
/* intermediate result of integer division needed here */
|
|
|
|
return (tmp>0) ? (tmp-1) : 0;
|
|
}
|
|
|
|
#define PHYCTL_SIR(br,ws,cs) BWP_TO_PHYCTL(BAUD_BITS(br),calc_width_bits((br),(ws),(cs)),0)
|
|
#define PHYCTL_MIR(cs) BWP_TO_PHYCTL(0,((cs)?9:10),1)
|
|
#define PHYCTL_FIR BWP_TO_PHYCTL(0,0,15)
|
|
|
|
/* quite ugly, I know. But implementing these calculations here avoids
|
|
* having magic numbers in the code and allows some playing with pulsewidths
|
|
* without risk to violate the standards.
|
|
* FWIW, here is the table for reference:
|
|
*
|
|
* baudrate BAUD min-PLSWID nom-PLSWID PREAMB
|
|
* 2400 47 0(0) 12(24) 0
|
|
* 9600 11 0(0) 12(24) 0
|
|
* 19200 5 1(2) 12(24) 0
|
|
* 38400 2 3(6) 12(24) 0
|
|
* 57600 1 5(10) 12(24) 0
|
|
* 115200 0 11(22) 12(24) 0
|
|
* MIR 0 - 9(10) 1
|
|
* FIR 0 - 0 15
|
|
*
|
|
* note: x(y) means x-value for 40MHz / y-value for 48MHz primary input clock
|
|
*/
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
|
|
/* VLSI_PIO_MAXPKT: Maximum Packet Length register (u16, rw) */
|
|
|
|
/* maximum acceptable length for received packets */
|
|
|
|
/* hw imposed limitation - register uses only [11:0] */
|
|
#define MAX_PACKET_LENGTH 0x0fff
|
|
|
|
/* IrLAP I-field (apparently not defined elsewhere) */
|
|
#define IRDA_MTU 2048
|
|
|
|
/* complete packet consists of A(1)+C(1)+I(<=IRDA_MTU) */
|
|
#define IRLAP_SKB_ALLOCSIZE (1+1+IRDA_MTU)
|
|
|
|
/* the buffers we use to exchange frames with the hardware need to be
|
|
* larger than IRLAP_SKB_ALLOCSIZE because we may have up to 4 bytes FCS
|
|
* appended and, in SIR mode, a lot of frame wrapping bytes. The worst
|
|
* case appears to be a SIR packet with I-size==IRDA_MTU and all bytes
|
|
* requiring to be escaped to provide transparency. Furthermore, the peer
|
|
* might ask for quite a number of additional XBOFs:
|
|
* up to 115+48 XBOFS 163
|
|
* regular BOF 1
|
|
* A-field 1
|
|
* C-field 1
|
|
* I-field, IRDA_MTU, all escaped 4096
|
|
* FCS (16 bit at SIR, escaped) 4
|
|
* EOF 1
|
|
* AFAICS nothing in IrLAP guarantees A/C field not to need escaping
|
|
* (f.e. 0xc0/0xc1 - i.e. BOF/EOF - are legal values there) so in the
|
|
* worst case we have 4269 bytes total frame size.
|
|
* However, the VLSI uses 12 bits only for all buffer length values,
|
|
* which limits the maximum useable buffer size <= 4095.
|
|
* Note this is not a limitation in the receive case because we use
|
|
* the SIR filtering mode where the hw unwraps the frame and only the
|
|
* bare packet+fcs is stored into the buffer - in contrast to the SIR
|
|
* tx case where we have to pass frame-wrapped packets to the hw.
|
|
* If this would ever become an issue in real life, the only workaround
|
|
* I see would be using the legacy UART emulation in SIR mode.
|
|
*/
|
|
|
|
#define XFER_BUF_SIZE MAX_PACKET_LENGTH
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_RCVBCNT: Receive Byte Count Register (u16, ro) */
|
|
|
|
/* receive packet counter gets incremented on every non-filtered
|
|
* byte which was put in the receive fifo and reset for each
|
|
* new packet. Used to decide whether we are just in the middle
|
|
* of receiving
|
|
*/
|
|
|
|
/* better apply the [11:0] mask when reading, as some docs say the
|
|
* reserved [15:12] would return 1 when reading - which is wrong AFAICS
|
|
*/
|
|
#define RCVBCNT_MASK 0x0fff
|
|
|
|
/******************************************************************/
|
|
|
|
/* descriptors for rx/tx ring
|
|
*
|
|
* accessed by hardware - don't change!
|
|
*
|
|
* the descriptor is owned by hardware, when the ACTIVE status bit
|
|
* is set and nothing (besides reading status to test the bit)
|
|
* shall be done. The bit gets cleared by hw, when the descriptor
|
|
* gets closed. Premature reaping of descriptors owned be the chip
|
|
* can be achieved by disabling IRCFG_MSTR
|
|
*
|
|
* Attention: Writing addr overwrites status!
|
|
*
|
|
* ### FIXME: depends on endianess (but there ain't no non-i586 ob800 ;-)
|
|
*/
|
|
|
|
struct ring_descr_hw {
|
|
volatile u16 rd_count; /* tx/rx count [11:0] */
|
|
u16 reserved;
|
|
union {
|
|
u32 addr; /* [23:0] of the buffer's busaddress */
|
|
struct {
|
|
u8 addr_res[3];
|
|
volatile u8 status; /* descriptor status */
|
|
} __attribute__((packed)) rd_s;
|
|
} __attribute((packed)) rd_u;
|
|
} __attribute__ ((packed));
|
|
|
|
#define rd_addr rd_u.addr
|
|
#define rd_status rd_u.rd_s.status
|
|
|
|
/* ring descriptor status bits */
|
|
|
|
#define RD_ACTIVE 0x80 /* descriptor owned by hw (both TX,RX) */
|
|
|
|
/* TX ring descriptor status */
|
|
|
|
#define RD_TX_DISCRC 0x40 /* do not send CRC (for SIR) */
|
|
#define RD_TX_BADCRC 0x20 /* force a bad CRC */
|
|
#define RD_TX_PULSE 0x10 /* send indication pulse after this frame (MIR/FIR) */
|
|
#define RD_TX_FRCEUND 0x08 /* force underrun */
|
|
#define RD_TX_CLRENTX 0x04 /* clear ENTX after this frame */
|
|
#define RD_TX_UNDRN 0x01 /* TX fifo underrun (probably PCI problem) */
|
|
|
|
/* RX ring descriptor status */
|
|
|
|
#define RD_RX_PHYERR 0x40 /* physical encoding error */
|
|
#define RD_RX_CRCERR 0x20 /* CRC error (MIR/FIR) */
|
|
#define RD_RX_LENGTH 0x10 /* frame exceeds buffer length */
|
|
#define RD_RX_OVER 0x08 /* RX fifo overrun (probably PCI problem) */
|
|
#define RD_RX_SIRBAD 0x04 /* EOF missing: BOF follows BOF (SIR, filtered) */
|
|
|
|
#define RD_RX_ERROR 0x7c /* any error in received frame */
|
|
|
|
/* the memory required to hold the 2 descriptor rings */
|
|
#define HW_RING_AREA_SIZE (2 * MAX_RING_DESCR * sizeof(struct ring_descr_hw))
|
|
|
|
/******************************************************************/
|
|
|
|
/* sw-ring descriptors consists of a bus-mapped transfer buffer with
|
|
* associated skb and a pointer to the hw entry descriptor
|
|
*/
|
|
|
|
struct ring_descr {
|
|
struct ring_descr_hw *hw;
|
|
struct sk_buff *skb;
|
|
void *buf;
|
|
};
|
|
|
|
/* wrappers for operations on hw-exposed ring descriptors
|
|
* access to the hw-part of the descriptors must use these.
|
|
*/
|
|
|
|
static inline int rd_is_active(struct ring_descr *rd)
|
|
{
|
|
return ((rd->hw->rd_status & RD_ACTIVE) != 0);
|
|
}
|
|
|
|
static inline void rd_activate(struct ring_descr *rd)
|
|
{
|
|
rd->hw->rd_status |= RD_ACTIVE;
|
|
}
|
|
|
|
static inline void rd_set_status(struct ring_descr *rd, u8 s)
|
|
{
|
|
rd->hw->rd_status = s; /* may pass ownership to the hardware */
|
|
}
|
|
|
|
static inline void rd_set_addr_status(struct ring_descr *rd, dma_addr_t a, u8 s)
|
|
{
|
|
/* order is important for two reasons:
|
|
* - overlayed: writing addr overwrites status
|
|
* - we want to write status last so we have valid address in
|
|
* case status has RD_ACTIVE set
|
|
*/
|
|
|
|
if ((a & ~DMA_MASK_MSTRPAGE)>>24 != MSTRPAGE_VALUE) {
|
|
IRDA_ERROR("%s: pci busaddr inconsistency!\n", __FUNCTION__);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
a &= DMA_MASK_MSTRPAGE; /* clear highbyte to make sure we won't write
|
|
* to status - just in case MSTRPAGE_VALUE!=0
|
|
*/
|
|
rd->hw->rd_addr = cpu_to_le32(a);
|
|
wmb();
|
|
rd_set_status(rd, s); /* may pass ownership to the hardware */
|
|
}
|
|
|
|
static inline void rd_set_count(struct ring_descr *rd, u16 c)
|
|
{
|
|
rd->hw->rd_count = cpu_to_le16(c);
|
|
}
|
|
|
|
static inline u8 rd_get_status(struct ring_descr *rd)
|
|
{
|
|
return rd->hw->rd_status;
|
|
}
|
|
|
|
static inline dma_addr_t rd_get_addr(struct ring_descr *rd)
|
|
{
|
|
dma_addr_t a;
|
|
|
|
a = le32_to_cpu(rd->hw->rd_addr);
|
|
return (a & DMA_MASK_MSTRPAGE) | (MSTRPAGE_VALUE << 24);
|
|
}
|
|
|
|
static inline u16 rd_get_count(struct ring_descr *rd)
|
|
{
|
|
return le16_to_cpu(rd->hw->rd_count);
|
|
}
|
|
|
|
/******************************************************************/
|
|
|
|
/* sw descriptor rings for rx, tx:
|
|
*
|
|
* operations follow producer-consumer paradigm, with the hw
|
|
* in the middle doing the processing.
|
|
* ring size must be power of two.
|
|
*
|
|
* producer advances r->tail after inserting for processing
|
|
* consumer advances r->head after removing processed rd
|
|
* ring is empty if head==tail / full if (tail+1)==head
|
|
*/
|
|
|
|
struct vlsi_ring {
|
|
struct pci_dev *pdev;
|
|
int dir;
|
|
unsigned len;
|
|
unsigned size;
|
|
unsigned mask;
|
|
atomic_t head, tail;
|
|
struct ring_descr *rd;
|
|
};
|
|
|
|
/* ring processing helpers */
|
|
|
|
static inline struct ring_descr *ring_last(struct vlsi_ring *r)
|
|
{
|
|
int t;
|
|
|
|
t = atomic_read(&r->tail) & r->mask;
|
|
return (((t+1) & r->mask) == (atomic_read(&r->head) & r->mask)) ? NULL : &r->rd[t];
|
|
}
|
|
|
|
static inline struct ring_descr *ring_put(struct vlsi_ring *r)
|
|
{
|
|
atomic_inc(&r->tail);
|
|
return ring_last(r);
|
|
}
|
|
|
|
static inline struct ring_descr *ring_first(struct vlsi_ring *r)
|
|
{
|
|
int h;
|
|
|
|
h = atomic_read(&r->head) & r->mask;
|
|
return (h == (atomic_read(&r->tail) & r->mask)) ? NULL : &r->rd[h];
|
|
}
|
|
|
|
static inline struct ring_descr *ring_get(struct vlsi_ring *r)
|
|
{
|
|
atomic_inc(&r->head);
|
|
return ring_first(r);
|
|
}
|
|
|
|
/******************************************************************/
|
|
|
|
/* our private compound VLSI-PCI-IRDA device information */
|
|
|
|
typedef struct vlsi_irda_dev {
|
|
struct pci_dev *pdev;
|
|
struct net_device_stats stats;
|
|
|
|
struct irlap_cb *irlap;
|
|
|
|
struct qos_info qos;
|
|
|
|
unsigned mode;
|
|
int baud, new_baud;
|
|
|
|
dma_addr_t busaddr;
|
|
void *virtaddr;
|
|
struct vlsi_ring *tx_ring, *rx_ring;
|
|
|
|
struct timeval last_rx;
|
|
|
|
spinlock_t lock;
|
|
struct semaphore sem;
|
|
|
|
u8 resume_ok;
|
|
struct proc_dir_entry *proc_entry;
|
|
|
|
} vlsi_irda_dev_t;
|
|
|
|
/********************************************************/
|
|
|
|
/* the remapped error flags we use for returning from frame
|
|
* post-processing in vlsi_process_tx/rx() after it was completed
|
|
* by the hardware. These functions either return the >=0 number
|
|
* of transfered bytes in case of success or the negative (-)
|
|
* of the or'ed error flags.
|
|
*/
|
|
|
|
#define VLSI_TX_DROP 0x0001
|
|
#define VLSI_TX_FIFO 0x0002
|
|
|
|
#define VLSI_RX_DROP 0x0100
|
|
#define VLSI_RX_OVER 0x0200
|
|
#define VLSI_RX_LENGTH 0x0400
|
|
#define VLSI_RX_FRAME 0x0800
|
|
#define VLSI_RX_CRC 0x1000
|
|
|
|
/********************************************************/
|
|
|
|
#endif /* IRDA_VLSI_FIR_H */
|
|
|