mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
e8478de32e
Several files refer to an old address for the Free Software Foundation in the file header comment. Resolve by replacing the address with the URL <http://www.gnu.org/licenses/> so that we do not have to keep updating the header comments anytime the address changes. CC: Samuel Ortiz <samuel@sortiz.org> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
757 lines
26 KiB
C
757 lines
26 KiB
C
|
|
/*********************************************************************
|
|
*
|
|
* vlsi_ir.h: VLSI82C147 PCI IrDA controller driver for Linux
|
|
*
|
|
* Version: 0.5
|
|
*
|
|
* Copyright (c) 2001-2003 Martin Diehl
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
********************************************************************/
|
|
|
|
#ifndef IRDA_VLSI_FIR_H
|
|
#define IRDA_VLSI_FIR_H
|
|
|
|
/* ================================================================
|
|
* compatibility stuff
|
|
*/
|
|
|
|
/* definitions not present in pci_ids.h */
|
|
|
|
#ifndef PCI_CLASS_WIRELESS_IRDA
|
|
#define PCI_CLASS_WIRELESS_IRDA 0x0d00
|
|
#endif
|
|
|
|
#ifndef PCI_CLASS_SUBCLASS_MASK
|
|
#define PCI_CLASS_SUBCLASS_MASK 0xffff
|
|
#endif
|
|
|
|
/* ================================================================ */
|
|
|
|
/* non-standard PCI registers */
|
|
|
|
enum vlsi_pci_regs {
|
|
VLSI_PCI_CLKCTL = 0x40, /* chip clock input control */
|
|
VLSI_PCI_MSTRPAGE = 0x41, /* addr [31:24] for all busmaster cycles */
|
|
VLSI_PCI_IRMISC = 0x42 /* mainly legacy UART related */
|
|
};
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PCI_CLKCTL: Clock Control Register (u8, rw) */
|
|
|
|
/* Three possible clock sources: either on-chip 48MHz PLL or
|
|
* external clock applied to EXTCLK pin. External clock may
|
|
* be either 48MHz or 40MHz, which is indicated by XCKSEL.
|
|
* CLKSTP controls whether the selected clock source gets
|
|
* connected to the IrDA block.
|
|
*
|
|
* On my HP OB-800 the BIOS sets external 40MHz clock as source
|
|
* when IrDA enabled and I've never detected any PLL lock success.
|
|
* Apparently the 14.3...MHz OSC input required for the PLL to work
|
|
* is not connected and the 40MHz EXTCLK is provided externally.
|
|
* At least this is what makes the driver working for me.
|
|
*/
|
|
|
|
enum vlsi_pci_clkctl {
|
|
|
|
/* PLL control */
|
|
|
|
CLKCTL_PD_INV = 0x04, /* PD#: inverted power down signal,
|
|
* i.e. PLL is powered, if PD_INV set */
|
|
CLKCTL_LOCK = 0x40, /* (ro) set, if PLL is locked */
|
|
|
|
/* clock source selection */
|
|
|
|
CLKCTL_EXTCLK = 0x20, /* set to select external clock input, not PLL */
|
|
CLKCTL_XCKSEL = 0x10, /* set to indicate EXTCLK is 40MHz, not 48MHz */
|
|
|
|
/* IrDA block control */
|
|
|
|
CLKCTL_CLKSTP = 0x80, /* set to disconnect from selected clock source */
|
|
CLKCTL_WAKE = 0x08 /* set to enable wakeup feature: whenever IR activity
|
|
* is detected, PD_INV gets set(?) and CLKSTP cleared */
|
|
};
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PCI_MSTRPAGE: Master Page Register (u8, rw) and busmastering stuff */
|
|
|
|
#define DMA_MASK_USED_BY_HW 0xffffffff
|
|
#define DMA_MASK_MSTRPAGE 0x00ffffff
|
|
#define MSTRPAGE_VALUE (DMA_MASK_MSTRPAGE >> 24)
|
|
|
|
/* PCI busmastering is somewhat special for this guy - in short:
|
|
*
|
|
* We select to operate using fixed MSTRPAGE=0, use ISA DMA
|
|
* address restrictions to make the PCI BM api aware of this,
|
|
* but ensure the hardware is dealing with real 32bit access.
|
|
*
|
|
* In detail:
|
|
* The chip executes normal 32bit busmaster cycles, i.e.
|
|
* drives all 32 address lines. These addresses however are
|
|
* composed of [0:23] taken from various busaddr-pointers
|
|
* and [24:31] taken from the MSTRPAGE register in the VLSI82C147
|
|
* config space. Therefore _all_ busmastering must be
|
|
* targeted to/from one single 16MB (busaddr-) superpage!
|
|
* The point is to make sure all the allocations for memory
|
|
* locations with busmaster access (ring descriptors, buffers)
|
|
* are indeed bus-mappable to the same 16MB range (for x86 this
|
|
* means they must reside in the same 16MB physical memory address
|
|
* range). The only constraint we have which supports "several objects
|
|
* mappable to common 16MB range" paradigma, is the old ISA DMA
|
|
* restriction to the first 16MB of physical address range.
|
|
* Hence the approach here is to enable PCI busmaster support using
|
|
* the correct 32bit dma-mask used by the chip. Afterwards the device's
|
|
* dma-mask gets restricted to 24bit, which must be honoured somehow by
|
|
* all allocations for memory areas to be exposed to the chip ...
|
|
*
|
|
* Note:
|
|
* Don't be surprised to get "Setting latency timer..." messages every
|
|
* time when PCI busmastering is enabled for the chip.
|
|
* The chip has its PCI latency timer RO fixed at 0 - which is not a
|
|
* problem here, because it is never requesting _burst_ transactions.
|
|
*/
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PCIIRMISC: IR Miscellaneous Register (u8, rw) */
|
|
|
|
/* legacy UART emulation - not used by this driver - would require:
|
|
* (see below for some register-value definitions)
|
|
*
|
|
* - IRMISC_UARTEN must be set to enable UART address decoding
|
|
* - IRMISC_UARTSEL configured
|
|
* - IRCFG_MASTER must be cleared
|
|
* - IRCFG_SIR must be set
|
|
* - IRENABLE_PHYANDCLOCK must be asserted 0->1 (and hence IRENABLE_SIR_ON)
|
|
*/
|
|
|
|
enum vlsi_pci_irmisc {
|
|
|
|
/* IR transceiver control */
|
|
|
|
IRMISC_IRRAIL = 0x40, /* (ro?) IR rail power indication (and control?)
|
|
* 0=3.3V / 1=5V. Probably set during power-on?
|
|
* unclear - not touched by driver */
|
|
IRMISC_IRPD = 0x08, /* transceiver power down, if set */
|
|
|
|
/* legacy UART control */
|
|
|
|
IRMISC_UARTTST = 0x80, /* UART test mode - "always write 0" */
|
|
IRMISC_UARTEN = 0x04, /* enable UART address decoding */
|
|
|
|
/* bits [1:0] IRMISC_UARTSEL to select legacy UART address */
|
|
|
|
IRMISC_UARTSEL_3f8 = 0x00,
|
|
IRMISC_UARTSEL_2f8 = 0x01,
|
|
IRMISC_UARTSEL_3e8 = 0x02,
|
|
IRMISC_UARTSEL_2e8 = 0x03
|
|
};
|
|
|
|
/* ================================================================ */
|
|
|
|
/* registers mapped to 32 byte PCI IO space */
|
|
|
|
/* note: better access all registers at the indicated u8/u16 size
|
|
* although some of them contain only 1 byte of information.
|
|
* some of them (particaluarly PROMPT and IRCFG) ignore
|
|
* access when using the wrong addressing mode!
|
|
*/
|
|
|
|
enum vlsi_pio_regs {
|
|
VLSI_PIO_IRINTR = 0x00, /* interrupt enable/request (u8, rw) */
|
|
VLSI_PIO_RINGPTR = 0x02, /* rx/tx ring pointer (u16, ro) */
|
|
VLSI_PIO_RINGBASE = 0x04, /* [23:10] of ring address (u16, rw) */
|
|
VLSI_PIO_RINGSIZE = 0x06, /* rx/tx ring size (u16, rw) */
|
|
VLSI_PIO_PROMPT = 0x08, /* triggers ring processing (u16, wo) */
|
|
/* 0x0a-0x0f: reserved / duplicated UART regs */
|
|
VLSI_PIO_IRCFG = 0x10, /* configuration select (u16, rw) */
|
|
VLSI_PIO_SIRFLAG = 0x12, /* BOF/EOF for filtered SIR (u16, ro) */
|
|
VLSI_PIO_IRENABLE = 0x14, /* enable and status register (u16, rw/ro) */
|
|
VLSI_PIO_PHYCTL = 0x16, /* physical layer current status (u16, ro) */
|
|
VLSI_PIO_NPHYCTL = 0x18, /* next physical layer select (u16, rw) */
|
|
VLSI_PIO_MAXPKT = 0x1a, /* [11:0] max len for packet receive (u16, rw) */
|
|
VLSI_PIO_RCVBCNT = 0x1c /* current receive-FIFO byte count (u16, ro) */
|
|
/* 0x1e-0x1f: reserved / duplicated UART regs */
|
|
};
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_IRINTR: Interrupt Register (u8, rw) */
|
|
|
|
/* enable-bits:
|
|
* 1 = enable / 0 = disable
|
|
* interrupt condition bits:
|
|
* set according to corresponding interrupt source
|
|
* (regardless of the state of the enable bits)
|
|
* enable bit status indicates whether interrupt gets raised
|
|
* write-to-clear
|
|
* note: RPKTINT and TPKTINT behave different in legacy UART mode (which we don't use :-)
|
|
*/
|
|
|
|
enum vlsi_pio_irintr {
|
|
IRINTR_ACTEN = 0x80, /* activity interrupt enable */
|
|
IRINTR_ACTIVITY = 0x40, /* activity monitor (traffic detected) */
|
|
IRINTR_RPKTEN = 0x20, /* receive packet interrupt enable*/
|
|
IRINTR_RPKTINT = 0x10, /* rx-packet transferred from fifo to memory finished */
|
|
IRINTR_TPKTEN = 0x08, /* transmit packet interrupt enable */
|
|
IRINTR_TPKTINT = 0x04, /* last bit of tx-packet+crc shifted to ir-pulser */
|
|
IRINTR_OE_EN = 0x02, /* UART rx fifo overrun error interrupt enable */
|
|
IRINTR_OE_INT = 0x01 /* UART rx fifo overrun error (read LSR to clear) */
|
|
};
|
|
|
|
/* we use this mask to check whether the (shared PCI) interrupt is ours */
|
|
|
|
#define IRINTR_INT_MASK (IRINTR_ACTIVITY|IRINTR_RPKTINT|IRINTR_TPKTINT)
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_RINGPTR: Ring Pointer Read-Back Register (u16, ro) */
|
|
|
|
/* _both_ ring pointers are indices relative to the _entire_ rx,tx-ring!
|
|
* i.e. the referenced descriptor is located
|
|
* at RINGBASE + PTR * sizeof(descr) for rx and tx
|
|
* therefore, the tx-pointer has offset MAX_RING_DESCR
|
|
*/
|
|
|
|
#define MAX_RING_DESCR 64 /* tx, rx rings may contain up to 64 descr each */
|
|
|
|
#define RINGPTR_RX_MASK (MAX_RING_DESCR-1)
|
|
#define RINGPTR_TX_MASK ((MAX_RING_DESCR-1)<<8)
|
|
|
|
#define RINGPTR_GET_RX(p) ((p)&RINGPTR_RX_MASK)
|
|
#define RINGPTR_GET_TX(p) (((p)&RINGPTR_TX_MASK)>>8)
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_RINGBASE: Ring Pointer Base Address Register (u16, ro) */
|
|
|
|
/* Contains [23:10] part of the ring base (bus-) address
|
|
* which must be 1k-alinged. [31:24] is taken from
|
|
* VLSI_PCI_MSTRPAGE above.
|
|
* The controller initiates non-burst PCI BM cycles to
|
|
* fetch and update the descriptors in the ring.
|
|
* Once fetched, the descriptor remains cached onchip
|
|
* until it gets closed and updated due to the ring
|
|
* processing state machine.
|
|
* The entire ring area is split in rx and tx areas with each
|
|
* area consisting of 64 descriptors of 8 bytes each.
|
|
* The rx(tx) ring is located at ringbase+0 (ringbase+64*8).
|
|
*/
|
|
|
|
#define BUS_TO_RINGBASE(p) (((p)>>10)&0x3fff)
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_RINGSIZE: Ring Size Register (u16, rw) */
|
|
|
|
/* bit mask to indicate the ring size to be used for rx and tx.
|
|
* possible values encoded bits
|
|
* 4 0000
|
|
* 8 0001
|
|
* 16 0011
|
|
* 32 0111
|
|
* 64 1111
|
|
* located at [15:12] for tx and [11:8] for rx ([7:0] unused)
|
|
*
|
|
* note: probably a good idea to have IRCFG_MSTR cleared when writing
|
|
* this so the state machines are stopped and the RINGPTR is reset!
|
|
*/
|
|
|
|
#define SIZE_TO_BITS(num) ((((num)-1)>>2)&0x0f)
|
|
#define TX_RX_TO_RINGSIZE(tx,rx) ((SIZE_TO_BITS(tx)<<12)|(SIZE_TO_BITS(rx)<<8))
|
|
#define RINGSIZE_TO_RXSIZE(rs) ((((rs)&0x0f00)>>6)+4)
|
|
#define RINGSIZE_TO_TXSIZE(rs) ((((rs)&0xf000)>>10)+4)
|
|
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_PROMPT: Ring Prompting Register (u16, write-to-start) */
|
|
|
|
/* writing any value kicks the ring processing state machines
|
|
* for both tx, rx rings as follows:
|
|
* - active rings (currently owning an active descriptor)
|
|
* ignore the prompt and continue
|
|
* - idle rings fetch the next descr from the ring and start
|
|
* their processing
|
|
*/
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_IRCFG: IR Config Register (u16, rw) */
|
|
|
|
/* notes:
|
|
* - not more than one SIR/MIR/FIR bit must be set at any time
|
|
* - SIR, MIR, FIR and CRC16 select the configuration which will
|
|
* be applied on next 0->1 transition of IRENABLE_PHYANDCLOCK (see below).
|
|
* - besides allowing the PCI interface to execute busmaster cycles
|
|
* and therefore the ring SM to operate, the MSTR bit has side-effects:
|
|
* when MSTR is cleared, the RINGPTR's get reset and the legacy UART mode
|
|
* (in contrast to busmaster access mode) gets enabled.
|
|
* - clearing ENRX or setting ENTX while data is received may stall the
|
|
* receive fifo until ENRX reenabled _and_ another packet arrives
|
|
* - SIRFILT means the chip performs the required unwrapping of hardware
|
|
* headers (XBOF's, BOF/EOF) and un-escaping in the _receive_ direction.
|
|
* Only the resulting IrLAP payload is copied to the receive buffers -
|
|
* but with the 16bit FCS still encluded. Question remains, whether it
|
|
* was already checked or we should do it before passing the packet to IrLAP?
|
|
*/
|
|
|
|
enum vlsi_pio_ircfg {
|
|
IRCFG_LOOP = 0x4000, /* enable loopback test mode */
|
|
IRCFG_ENTX = 0x1000, /* transmit enable */
|
|
IRCFG_ENRX = 0x0800, /* receive enable */
|
|
IRCFG_MSTR = 0x0400, /* master enable */
|
|
IRCFG_RXANY = 0x0200, /* receive any packet */
|
|
IRCFG_CRC16 = 0x0080, /* 16bit (not 32bit) CRC select for MIR/FIR */
|
|
IRCFG_FIR = 0x0040, /* FIR 4PPM encoding mode enable */
|
|
IRCFG_MIR = 0x0020, /* MIR HDLC encoding mode enable */
|
|
IRCFG_SIR = 0x0010, /* SIR encoding mode enable */
|
|
IRCFG_SIRFILT = 0x0008, /* enable SIR decode filter (receiver unwrapping) */
|
|
IRCFG_SIRTEST = 0x0004, /* allow SIR decode filter when not in SIR mode */
|
|
IRCFG_TXPOL = 0x0002, /* invert tx polarity when set */
|
|
IRCFG_RXPOL = 0x0001 /* invert rx polarity when set */
|
|
};
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_SIRFLAG: SIR Flag Register (u16, ro) */
|
|
|
|
/* register contains hardcoded BOF=0xc0 at [7:0] and EOF=0xc1 at [15:8]
|
|
* which is used for unwrapping received frames in SIR decode-filter mode
|
|
*/
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_IRENABLE: IR Enable Register (u16, rw/ro) */
|
|
|
|
/* notes:
|
|
* - IREN acts as gate for latching the configured IR mode information
|
|
* from IRCFG and IRPHYCTL when IREN=reset and applying them when
|
|
* IREN gets set afterwards.
|
|
* - ENTXST reflects IRCFG_ENTX
|
|
* - ENRXST = IRCFG_ENRX && (!IRCFG_ENTX || IRCFG_LOOP)
|
|
*/
|
|
|
|
enum vlsi_pio_irenable {
|
|
IRENABLE_PHYANDCLOCK = 0x8000, /* enable IR phy and gate the mode config (rw) */
|
|
IRENABLE_CFGER = 0x4000, /* mode configuration error (ro) */
|
|
IRENABLE_FIR_ON = 0x2000, /* FIR on status (ro) */
|
|
IRENABLE_MIR_ON = 0x1000, /* MIR on status (ro) */
|
|
IRENABLE_SIR_ON = 0x0800, /* SIR on status (ro) */
|
|
IRENABLE_ENTXST = 0x0400, /* transmit enable status (ro) */
|
|
IRENABLE_ENRXST = 0x0200, /* Receive enable status (ro) */
|
|
IRENABLE_CRC16_ON = 0x0100 /* 16bit (not 32bit) CRC enabled status (ro) */
|
|
};
|
|
|
|
#define IRENABLE_MASK 0xff00 /* Read mask */
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_PHYCTL: IR Physical Layer Current Control Register (u16, ro) */
|
|
|
|
/* read-back of the currently applied physical layer status.
|
|
* applied from VLSI_PIO_NPHYCTL at rising edge of IRENABLE_PHYANDCLOCK
|
|
* contents identical to VLSI_PIO_NPHYCTL (see below)
|
|
*/
|
|
|
|
/* ------------------------------------------ */
|
|
|
|
/* VLSI_PIO_NPHYCTL: IR Physical Layer Next Control Register (u16, rw) */
|
|
|
|
/* latched during IRENABLE_PHYANDCLOCK=0 and applied at 0-1 transition
|
|
*
|
|
* consists of BAUD[15:10], PLSWID[9:5] and PREAMB[4:0] bits defined as follows:
|
|
*
|
|
* SIR-mode: BAUD = (115.2kHz / baudrate) - 1
|
|
* PLSWID = (pulsetime * freq / (BAUD+1)) - 1
|
|
* where pulsetime is the requested IrPHY pulse width
|
|
* and freq is 8(16)MHz for 40(48)MHz primary input clock
|
|
* PREAMB: don't care for SIR
|
|
*
|
|
* The nominal SIR pulse width is 3/16 bit time so we have PLSWID=12
|
|
* fixed for all SIR speeds at 40MHz input clock (PLSWID=24 at 48MHz).
|
|
* IrPHY also allows shorter pulses down to the nominal pulse duration
|
|
* at 115.2kbaud (minus some tolerance) which is 1.41 usec.
|
|
* Using the expression PLSWID = 12/(BAUD+1)-1 (multiplied by two for 48MHz)
|
|
* we get the minimum acceptable PLSWID values according to the VLSI
|
|
* specification, which provides 1.5 usec pulse width for all speeds (except
|
|
* for 2.4kbaud getting 6usec). This is fine with IrPHY v1.3 specs and
|
|
* reduces the transceiver power which drains the battery. At 9.6kbaud for
|
|
* example this amounts to more than 90% battery power saving!
|
|
*
|
|
* MIR-mode: BAUD = 0
|
|
* PLSWID = 9(10) for 40(48) MHz input clock
|
|
* to get nominal MIR pulse width
|
|
* PREAMB = 1
|
|
*
|
|
* FIR-mode: BAUD = 0
|
|
* PLSWID: don't care
|
|
* PREAMB = 15
|
|
*/
|
|
|
|
#define PHYCTL_BAUD_SHIFT 10
|
|
#define PHYCTL_BAUD_MASK 0xfc00
|
|
#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 __le16 rd_count; /* tx/rx count [11:0] */
|
|
__le16 reserved;
|
|
union {
|
|
__le32 addr; /* [23:0] of the buffer's busaddress */
|
|
struct {
|
|
u8 addr_res[3];
|
|
volatile u8 status; /* descriptor status */
|
|
} __packed rd_s;
|
|
} __packed rd_u;
|
|
} __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", __func__);
|
|
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 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 mutex mtx;
|
|
|
|
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 transferred 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 */
|
|
|