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android-kvm / linux / 1367afaa2ee90d1c956dfc224e199fcb3ff3f8cc / . / drivers / parport / parport_ip32.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Low-level parallel port routines for built-in port on SGI IP32
*
* Author: Arnaud Giersch <arnaud.giersch@free.fr>
*
* Based on parport_pc.c by
* Phil Blundell, Tim Waugh, Jose Renau, David Campbell,
* Andrea Arcangeli, et al.
*
* Thanks to Ilya A. Volynets-Evenbakh for his help.
*
* Copyright (C) 2005, 2006 Arnaud Giersch.
*/
/* Current status:
*
* Basic SPP and PS2 modes are supported.
* Support for parallel port IRQ is present.
* Hardware SPP (a.k.a. compatibility), EPP, and ECP modes are
* supported.
* SPP/ECP FIFO can be driven in PIO or DMA mode. PIO mode can work with
* or without interrupt support.
*
* Hardware ECP mode is not fully implemented (ecp_read_data and
* ecp_write_addr are actually missing).
*
* To do:
*
* Fully implement ECP mode.
* EPP and ECP mode need to be tested. I currently do not own any
* peripheral supporting these extended mode, and cannot test them.
* If DMA mode works well, decide if support for PIO FIFO modes should be
* dropped.
* Use the io{read,write} family functions when they become available in
* the linux-mips.org tree. Note: the MIPS specific functions readsb()
* and writesb() are to be translated by ioread8_rep() and iowrite8_rep()
* respectively.
*/
/* The built-in parallel port on the SGI 02 workstation (a.k.a. IP32) is an
* IEEE 1284 parallel port driven by a Texas Instrument TL16PIR552PH chip[1].
* This chip supports SPP, bidirectional, EPP and ECP modes. It has a 16 byte
* FIFO buffer and supports DMA transfers.
*
* [1] http://focus.ti.com/docs/prod/folders/print/tl16pir552.html
*
* Theoretically, we could simply use the parport_pc module. It is however
* not so simple. The parport_pc code assumes that the parallel port
* registers are port-mapped. On the O2, they are memory-mapped.
* Furthermore, each register is replicated on 256 consecutive addresses (as
* it is for the built-in serial ports on the same chip).
*/
/*--- Some configuration defines ---------------------------------------*/
/* DEBUG_PARPORT_IP32
* 0 disable debug
* 1 standard level: pr_debug1 is enabled
* 2 parport_ip32_dump_state is enabled
* >=3 verbose level: pr_debug is enabled
*/
#if !defined(DEBUG_PARPORT_IP32)
# define DEBUG_PARPORT_IP32 0 /* 0 (disabled) for production */
#endif
/*----------------------------------------------------------------------*/
/* Setup DEBUG macros. This is done before any includes, just in case we
* activate pr_debug() with DEBUG_PARPORT_IP32 >= 3.
*/
#if DEBUG_PARPORT_IP32 == 1
# warning DEBUG_PARPORT_IP32 == 1
#elif DEBUG_PARPORT_IP32 == 2
# warning DEBUG_PARPORT_IP32 == 2
#elif DEBUG_PARPORT_IP32 >= 3
# warning DEBUG_PARPORT_IP32 >= 3
# if !defined(DEBUG)
# define DEBUG /* enable pr_debug() in kernel.h */
# endif
#endif
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/parport.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/ip32/ip32_ints.h>
#include <asm/ip32/mace.h>
/*--- Global variables -------------------------------------------------*/
/* Verbose probing on by default for debugging. */
#if DEBUG_PARPORT_IP32 >= 1
# define DEFAULT_VERBOSE_PROBING 1
#else
# define DEFAULT_VERBOSE_PROBING 0
#endif
/* Default prefix for printk */
#define PPIP32 "parport_ip32: "
/*
* These are the module parameters:
* @features: bit mask of features to enable/disable
* (all enabled by default)
* @verbose_probing: log chit-chat during initialization
*/
#define PARPORT_IP32_ENABLE_IRQ (1U << 0)
#define PARPORT_IP32_ENABLE_DMA (1U << 1)
#define PARPORT_IP32_ENABLE_SPP (1U << 2)
#define PARPORT_IP32_ENABLE_EPP (1U << 3)
#define PARPORT_IP32_ENABLE_ECP (1U << 4)
static unsigned int features = ~0U;
static bool verbose_probing = DEFAULT_VERBOSE_PROBING;
/* We do not support more than one port. */
static struct parport *this_port;
/* Timing constants for FIFO modes. */
#define FIFO_NFAULT_TIMEOUT 100 /* milliseconds */
#define FIFO_POLLING_INTERVAL 50 /* microseconds */
/*--- I/O register definitions -----------------------------------------*/
/**
* struct parport_ip32_regs - virtual addresses of parallel port registers
* @data: Data Register
* @dsr: Device Status Register
* @dcr: Device Control Register
* @eppAddr: EPP Address Register
* @eppData0: EPP Data Register 0
* @eppData1: EPP Data Register 1
* @eppData2: EPP Data Register 2
* @eppData3: EPP Data Register 3
* @ecpAFifo: ECP Address FIFO
* @fifo: General FIFO register. The same address is used for:
* - cFifo, the Parallel Port DATA FIFO
* - ecpDFifo, the ECP Data FIFO
* - tFifo, the ECP Test FIFO
* @cnfgA: Configuration Register A
* @cnfgB: Configuration Register B
* @ecr: Extended Control Register
*/
struct parport_ip32_regs {
void __iomem *data;
void __iomem *dsr;
void __iomem *dcr;
void __iomem *eppAddr;
void __iomem *eppData0;
void __iomem *eppData1;
void __iomem *eppData2;
void __iomem *eppData3;
void __iomem *ecpAFifo;
void __iomem *fifo;
void __iomem *cnfgA;
void __iomem *cnfgB;
void __iomem *ecr;
};
/* Device Status Register */
#define DSR_nBUSY (1U << 7) /* PARPORT_STATUS_BUSY */
#define DSR_nACK (1U << 6) /* PARPORT_STATUS_ACK */
#define DSR_PERROR (1U << 5) /* PARPORT_STATUS_PAPEROUT */
#define DSR_SELECT (1U << 4) /* PARPORT_STATUS_SELECT */
#define DSR_nFAULT (1U << 3) /* PARPORT_STATUS_ERROR */
#define DSR_nPRINT (1U << 2) /* specific to TL16PIR552 */
/* #define DSR_reserved (1U << 1) */
#define DSR_TIMEOUT (1U << 0) /* EPP timeout */
/* Device Control Register */
/* #define DCR_reserved (1U << 7) | (1U << 6) */
#define DCR_DIR (1U << 5) /* direction */
#define DCR_IRQ (1U << 4) /* interrupt on nAck */
#define DCR_SELECT (1U << 3) /* PARPORT_CONTROL_SELECT */
#define DCR_nINIT (1U << 2) /* PARPORT_CONTROL_INIT */
#define DCR_AUTOFD (1U << 1) /* PARPORT_CONTROL_AUTOFD */
#define DCR_STROBE (1U << 0) /* PARPORT_CONTROL_STROBE */
/* ECP Configuration Register A */
#define CNFGA_IRQ (1U << 7)
#define CNFGA_ID_MASK ((1U << 6) | (1U << 5) | (1U << 4))
#define CNFGA_ID_SHIFT 4
#define CNFGA_ID_16 (00U << CNFGA_ID_SHIFT)
#define CNFGA_ID_8 (01U << CNFGA_ID_SHIFT)
#define CNFGA_ID_32 (02U << CNFGA_ID_SHIFT)
/* #define CNFGA_reserved (1U << 3) */
#define CNFGA_nBYTEINTRANS (1U << 2)
#define CNFGA_PWORDLEFT ((1U << 1) | (1U << 0))
/* ECP Configuration Register B */
#define CNFGB_COMPRESS (1U << 7)
#define CNFGB_INTRVAL (1U << 6)
#define CNFGB_IRQ_MASK ((1U << 5) | (1U << 4) | (1U << 3))
#define CNFGB_IRQ_SHIFT 3
#define CNFGB_DMA_MASK ((1U << 2) | (1U << 1) | (1U << 0))
#define CNFGB_DMA_SHIFT 0
/* Extended Control Register */
#define ECR_MODE_MASK ((1U << 7) | (1U << 6) | (1U << 5))
#define ECR_MODE_SHIFT 5
#define ECR_MODE_SPP (00U << ECR_MODE_SHIFT)
#define ECR_MODE_PS2 (01U << ECR_MODE_SHIFT)
#define ECR_MODE_PPF (02U << ECR_MODE_SHIFT)
#define ECR_MODE_ECP (03U << ECR_MODE_SHIFT)
#define ECR_MODE_EPP (04U << ECR_MODE_SHIFT)
/* #define ECR_MODE_reserved (05U << ECR_MODE_SHIFT) */
#define ECR_MODE_TST (06U << ECR_MODE_SHIFT)
#define ECR_MODE_CFG (07U << ECR_MODE_SHIFT)
#define ECR_nERRINTR (1U << 4)
#define ECR_DMAEN (1U << 3)
#define ECR_SERVINTR (1U << 2)
#define ECR_F_FULL (1U << 1)
#define ECR_F_EMPTY (1U << 0)
/*--- Private data -----------------------------------------------------*/
/**
* enum parport_ip32_irq_mode - operation mode of interrupt handler
* @PARPORT_IP32_IRQ_FWD: forward interrupt to the upper parport layer
* @PARPORT_IP32_IRQ_HERE: interrupt is handled locally
*/
enum parport_ip32_irq_mode { PARPORT_IP32_IRQ_FWD, PARPORT_IP32_IRQ_HERE };
/**
* struct parport_ip32_private - private stuff for &struct parport
* @regs: register addresses
* @dcr_cache: cached contents of DCR
* @dcr_writable: bit mask of writable DCR bits
* @pword: number of bytes per PWord
* @fifo_depth: number of PWords that FIFO will hold
* @readIntrThreshold: minimum number of PWords we can read
* if we get an interrupt
* @writeIntrThreshold: minimum number of PWords we can write
* if we get an interrupt
* @irq_mode: operation mode of interrupt handler for this port
* @irq_complete: mutex used to wait for an interrupt to occur
*/
struct parport_ip32_private {
struct parport_ip32_regs regs;
unsigned int dcr_cache;
unsigned int dcr_writable;
unsigned int pword;
unsigned int fifo_depth;
unsigned int readIntrThreshold;
unsigned int writeIntrThreshold;
enum parport_ip32_irq_mode irq_mode;
struct completion irq_complete;
};
/*--- Debug code -------------------------------------------------------*/
/*
* pr_debug1 - print debug messages
*
* This is like pr_debug(), but is defined for %DEBUG_PARPORT_IP32 >= 1
*/
#if DEBUG_PARPORT_IP32 >= 1
# define pr_debug1(...) printk(KERN_DEBUG __VA_ARGS__)
#else /* DEBUG_PARPORT_IP32 < 1 */
# define pr_debug1(...) do { } while (0)
#endif
/*
* pr_trace, pr_trace1 - trace function calls
* @p: pointer to &struct parport
* @fmt: printk format string
* @...: parameters for format string
*
* Macros used to trace function calls. The given string is formatted after
* function name. pr_trace() uses pr_debug(), and pr_trace1() uses
* pr_debug1(). __pr_trace() is the low-level macro and is not to be used
* directly.
*/
#define __pr_trace(pr, p, fmt, ...) \
pr("%s: %s" fmt "\n", \
({ const struct parport *__p = (p); \
__p ? __p->name : "parport_ip32"; }), \
__func__ , ##__VA_ARGS__)
#define pr_trace(p, fmt, ...) __pr_trace(pr_debug, p, fmt , ##__VA_ARGS__)
#define pr_trace1(p, fmt, ...) __pr_trace(pr_debug1, p, fmt , ##__VA_ARGS__)
/*
* __pr_probe, pr_probe - print message if @verbose_probing is true
* @p: pointer to &struct parport
* @fmt: printk format string
* @...: parameters for format string
*
* For new lines, use pr_probe(). Use __pr_probe() for continued lines.
*/
#define __pr_probe(...) \
do { if (verbose_probing) printk(__VA_ARGS__); } while (0)
#define pr_probe(p, fmt, ...) \
__pr_probe(KERN_INFO PPIP32 "0x%lx: " fmt, (p)->base , ##__VA_ARGS__)
/*
* parport_ip32_dump_state - print register status of parport
* @p: pointer to &struct parport
* @str: string to add in message
* @show_ecp_config: shall we dump ECP configuration registers too?
*
* This function is only here for debugging purpose, and should be used with
* care. Reading the parallel port registers may have undesired side effects.
* Especially if @show_ecp_config is true, the parallel port is resetted.
* This function is only defined if %DEBUG_PARPORT_IP32 >= 2.
*/
#if DEBUG_PARPORT_IP32 >= 2
static void parport_ip32_dump_state(struct parport *p, char *str,
unsigned int show_ecp_config)
{
struct parport_ip32_private * const priv = p->physport->private_data;
unsigned int i;
printk(KERN_DEBUG PPIP32 "%s: state (%s):\n", p->name, str);
{
static const char ecr_modes[8][4] = {"SPP", "PS2", "PPF",
"ECP", "EPP", "???",
"TST", "CFG"};
unsigned int ecr = readb(priv->regs.ecr);
printk(KERN_DEBUG PPIP32 " ecr=0x%02x", ecr);
pr_cont(" %s",
ecr_modes[(ecr & ECR_MODE_MASK) >> ECR_MODE_SHIFT]);
if (ecr & ECR_nERRINTR)
pr_cont(",nErrIntrEn");
if (ecr & ECR_DMAEN)
pr_cont(",dmaEn");
if (ecr & ECR_SERVINTR)
pr_cont(",serviceIntr");
if (ecr & ECR_F_FULL)
pr_cont(",f_full");
if (ecr & ECR_F_EMPTY)
pr_cont(",f_empty");
pr_cont("\n");
}
if (show_ecp_config) {
unsigned int oecr, cnfgA, cnfgB;
oecr = readb(priv->regs.ecr);
writeb(ECR_MODE_PS2, priv->regs.ecr);
writeb(ECR_MODE_CFG, priv->regs.ecr);
cnfgA = readb(priv->regs.cnfgA);
cnfgB = readb(priv->regs.cnfgB);
writeb(ECR_MODE_PS2, priv->regs.ecr);
writeb(oecr, priv->regs.ecr);
printk(KERN_DEBUG PPIP32 " cnfgA=0x%02x", cnfgA);
pr_cont(" ISA-%s", (cnfgA & CNFGA_IRQ) ? "Level" : "Pulses");
switch (cnfgA & CNFGA_ID_MASK) {
case CNFGA_ID_8:
pr_cont(",8 bits");
break;
case CNFGA_ID_16:
pr_cont(",16 bits");
break;
case CNFGA_ID_32:
pr_cont(",32 bits");
break;
default:
pr_cont(",unknown ID");
break;
}
if (!(cnfgA & CNFGA_nBYTEINTRANS))
pr_cont(",ByteInTrans");
if ((cnfgA & CNFGA_ID_MASK) != CNFGA_ID_8)
pr_cont(",%d byte%s left",
cnfgA & CNFGA_PWORDLEFT,
((cnfgA & CNFGA_PWORDLEFT) > 1) ? "s" : "");
pr_cont("\n");
printk(KERN_DEBUG PPIP32 " cnfgB=0x%02x", cnfgB);
pr_cont(" irq=%u,dma=%u",
(cnfgB & CNFGB_IRQ_MASK) >> CNFGB_IRQ_SHIFT,
(cnfgB & CNFGB_DMA_MASK) >> CNFGB_DMA_SHIFT);
pr_cont(",intrValue=%d", !!(cnfgB & CNFGB_INTRVAL));
if (cnfgB & CNFGB_COMPRESS)
pr_cont(",compress");
pr_cont("\n");
}
for (i = 0; i < 2; i++) {
unsigned int dcr = i ? priv->dcr_cache : readb(priv->regs.dcr);
printk(KERN_DEBUG PPIP32 " dcr(%s)=0x%02x",
i ? "soft" : "hard", dcr);
pr_cont(" %s", (dcr & DCR_DIR) ? "rev" : "fwd");
if (dcr & DCR_IRQ)
pr_cont(",ackIntEn");
if (!(dcr & DCR_SELECT))
pr_cont(",nSelectIn");
if (dcr & DCR_nINIT)
pr_cont(",nInit");
if (!(dcr & DCR_AUTOFD))
pr_cont(",nAutoFD");
if (!(dcr & DCR_STROBE))
pr_cont(",nStrobe");
pr_cont("\n");
}
#define sep (f++ ? ',' : ' ')
{
unsigned int f = 0;
unsigned int dsr = readb(priv->regs.dsr);
printk(KERN_DEBUG PPIP32 " dsr=0x%02x", dsr);
if (!(dsr & DSR_nBUSY))
pr_cont("%cBusy", sep);
if (dsr & DSR_nACK)
pr_cont("%cnAck", sep);
if (dsr & DSR_PERROR)
pr_cont("%cPError", sep);
if (dsr & DSR_SELECT)
pr_cont("%cSelect", sep);
if (dsr & DSR_nFAULT)
pr_cont("%cnFault", sep);
if (!(dsr & DSR_nPRINT))
pr_cont("%c(Print)", sep);
if (dsr & DSR_TIMEOUT)
pr_cont("%cTimeout", sep);
pr_cont("\n");
}
#undef sep
}
#else /* DEBUG_PARPORT_IP32 < 2 */
#define parport_ip32_dump_state(...) do { } while (0)
#endif
/*
* CHECK_EXTRA_BITS - track and log extra bits
* @p: pointer to &struct parport
* @b: byte to inspect
* @m: bit mask of authorized bits
*
* This is used to track and log extra bits that should not be there in
* parport_ip32_write_control() and parport_ip32_frob_control(). It is only
* defined if %DEBUG_PARPORT_IP32 >= 1.
*/
#if DEBUG_PARPORT_IP32 >= 1
#define CHECK_EXTRA_BITS(p, b, m) \
do { \
unsigned int __b = (b), __m = (m); \
if (__b & ~__m) \
pr_debug1(PPIP32 "%s: extra bits in %s(%s): " \
"0x%02x/0x%02x\n", \
(p)->name, __func__, #b, __b, __m); \
} while (0)
#else /* DEBUG_PARPORT_IP32 < 1 */
#define CHECK_EXTRA_BITS(...) do { } while (0)
#endif
/*--- IP32 parallel port DMA operations --------------------------------*/
/**
* struct parport_ip32_dma_data - private data needed for DMA operation
* @dir: DMA direction (from or to device)
* @buf: buffer physical address
* @len: buffer length
* @next: address of next bytes to DMA transfer
* @left: number of bytes remaining
* @ctx: next context to write (0: context_a; 1: context_b)
* @irq_on: are the DMA IRQs currently enabled?
* @lock: spinlock to protect access to the structure
*/
struct parport_ip32_dma_data {
enum dma_data_direction dir;
dma_addr_t buf;
dma_addr_t next;
size_t len;
size_t left;
unsigned int ctx;
unsigned int irq_on;
spinlock_t lock;
};
static struct parport_ip32_dma_data parport_ip32_dma;
/**
* parport_ip32_dma_setup_context - setup next DMA context
* @limit: maximum data size for the context
*
* The alignment constraints must be verified in caller function, and the
* parameter @limit must be set accordingly.
*/
static void parport_ip32_dma_setup_context(unsigned int limit)
{
unsigned long flags;
spin_lock_irqsave(&parport_ip32_dma.lock, flags);
if (parport_ip32_dma.left > 0) {
/* Note: ctxreg is "volatile" here only because
* mace->perif.ctrl.parport.context_a and context_b are
* "volatile". */
volatile u64 __iomem *ctxreg = (parport_ip32_dma.ctx == 0) ?
&mace->perif.ctrl.parport.context_a :
&mace->perif.ctrl.parport.context_b;
u64 count;
u64 ctxval;
if (parport_ip32_dma.left <= limit) {
count = parport_ip32_dma.left;
ctxval = MACEPAR_CONTEXT_LASTFLAG;
} else {
count = limit;
ctxval = 0;
}
pr_trace(NULL,
"(%u): 0x%04x:0x%04x, %u -> %u%s",
limit,
(unsigned int)parport_ip32_dma.buf,
(unsigned int)parport_ip32_dma.next,
(unsigned int)count,
parport_ip32_dma.ctx, ctxval ? "*" : "");
ctxval |= parport_ip32_dma.next &
MACEPAR_CONTEXT_BASEADDR_MASK;
ctxval |= ((count - 1) << MACEPAR_CONTEXT_DATALEN_SHIFT) &
MACEPAR_CONTEXT_DATALEN_MASK;
writeq(ctxval, ctxreg);
parport_ip32_dma.next += count;
parport_ip32_dma.left -= count;
parport_ip32_dma.ctx ^= 1U;
}
/* If there is nothing more to send, disable IRQs to avoid to
* face an IRQ storm which can lock the machine. Disable them
* only once. */
if (parport_ip32_dma.left == 0 && parport_ip32_dma.irq_on) {
pr_debug(PPIP32 "IRQ off (ctx)\n");
disable_irq_nosync(MACEISA_PAR_CTXA_IRQ);
disable_irq_nosync(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 0;
}
spin_unlock_irqrestore(&parport_ip32_dma.lock, flags);
}
/**
* parport_ip32_dma_interrupt - DMA interrupt handler
* @irq: interrupt number
* @dev_id: unused
*/
static irqreturn_t parport_ip32_dma_interrupt(int irq, void *dev_id)
{
if (parport_ip32_dma.left)
pr_trace(NULL, "(%d): ctx=%d", irq, parport_ip32_dma.ctx);
parport_ip32_dma_setup_context(MACEPAR_CONTEXT_DATA_BOUND);
return IRQ_HANDLED;
}
#if DEBUG_PARPORT_IP32
static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)
{
pr_trace1(NULL, "(%d)", irq);
return IRQ_HANDLED;
}
#endif
/**
* parport_ip32_dma_start - begins a DMA transfer
* @p: partport to work on
* @dir: DMA direction: DMA_TO_DEVICE or DMA_FROM_DEVICE
* @addr: pointer to data buffer
* @count: buffer size
*
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
static int parport_ip32_dma_start(struct parport *p,
enum dma_data_direction dir, void *addr, size_t count)
{
unsigned int limit;
u64 ctrl;
pr_trace(NULL, "(%d, %lu)", dir, (unsigned long)count);
/* FIXME - add support for DMA_FROM_DEVICE. In this case, buffer must
* be 64 bytes aligned. */
BUG_ON(dir != DMA_TO_DEVICE);
/* Reset DMA controller */
ctrl = MACEPAR_CTLSTAT_RESET;
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
/* DMA IRQs should normally be enabled */
if (!parport_ip32_dma.irq_on) {
WARN_ON(1);
enable_irq(MACEISA_PAR_CTXA_IRQ);
enable_irq(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 1;
}
/* Prepare DMA pointers */
parport_ip32_dma.dir = dir;
parport_ip32_dma.buf = dma_map_single(&p->bus_dev, addr, count, dir);
parport_ip32_dma.len = count;
parport_ip32_dma.next = parport_ip32_dma.buf;
parport_ip32_dma.left = parport_ip32_dma.len;
parport_ip32_dma.ctx = 0;
/* Setup DMA direction and first two contexts */
ctrl = (dir == DMA_TO_DEVICE) ? 0 : MACEPAR_CTLSTAT_DIRECTION;
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
/* Single transfer should not cross a 4K page boundary */
limit = MACEPAR_CONTEXT_DATA_BOUND -
(parport_ip32_dma.next & (MACEPAR_CONTEXT_DATA_BOUND - 1));
parport_ip32_dma_setup_context(limit);
parport_ip32_dma_setup_context(MACEPAR_CONTEXT_DATA_BOUND);
/* Real start of DMA transfer */
ctrl |= MACEPAR_CTLSTAT_ENABLE;
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
return 0;
}
/**
* parport_ip32_dma_stop - ends a running DMA transfer
* @p: partport to work on
*
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
static void parport_ip32_dma_stop(struct parport *p)
{
u64 ctx_a;
u64 ctx_b;
u64 ctrl;
u64 diag;
size_t res[2]; /* {[0] = res_a, [1] = res_b} */
pr_trace(NULL, "()");
/* Disable IRQs */
spin_lock_irq(&parport_ip32_dma.lock);
if (parport_ip32_dma.irq_on) {
pr_debug(PPIP32 "IRQ off (stop)\n");
disable_irq_nosync(MACEISA_PAR_CTXA_IRQ);
disable_irq_nosync(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 0;
}
spin_unlock_irq(&parport_ip32_dma.lock);
/* Force IRQ synchronization, even if the IRQs were disabled
* elsewhere. */
synchronize_irq(MACEISA_PAR_CTXA_IRQ);
synchronize_irq(MACEISA_PAR_CTXB_IRQ);
/* Stop DMA transfer */
ctrl = readq(&mace->perif.ctrl.parport.cntlstat);
ctrl &= ~MACEPAR_CTLSTAT_ENABLE;
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
/* Adjust residue (parport_ip32_dma.left) */
ctx_a = readq(&mace->perif.ctrl.parport.context_a);
ctx_b = readq(&mace->perif.ctrl.parport.context_b);
ctrl = readq(&mace->perif.ctrl.parport.cntlstat);
diag = readq(&mace->perif.ctrl.parport.diagnostic);
res[0] = (ctrl & MACEPAR_CTLSTAT_CTXA_VALID) ?
1 + ((ctx_a & MACEPAR_CONTEXT_DATALEN_MASK) >>
MACEPAR_CONTEXT_DATALEN_SHIFT) :
0;
res[1] = (ctrl & MACEPAR_CTLSTAT_CTXB_VALID) ?
1 + ((ctx_b & MACEPAR_CONTEXT_DATALEN_MASK) >>
MACEPAR_CONTEXT_DATALEN_SHIFT) :
0;
if (diag & MACEPAR_DIAG_DMACTIVE)
res[(diag & MACEPAR_DIAG_CTXINUSE) != 0] =
1 + ((diag & MACEPAR_DIAG_CTRMASK) >>
MACEPAR_DIAG_CTRSHIFT);
parport_ip32_dma.left += res[0] + res[1];
/* Reset DMA controller, and re-enable IRQs */
ctrl = MACEPAR_CTLSTAT_RESET;
writeq(ctrl, &mace->perif.ctrl.parport.cntlstat);
pr_debug(PPIP32 "IRQ on (stop)\n");
enable_irq(MACEISA_PAR_CTXA_IRQ);
enable_irq(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 1;
dma_unmap_single(&p->bus_dev, parport_ip32_dma.buf,
parport_ip32_dma.len, parport_ip32_dma.dir);
}
/**
* parport_ip32_dma_get_residue - get residue from last DMA transfer
*
* Returns the number of bytes remaining from last DMA transfer.
*/
static inline size_t parport_ip32_dma_get_residue(void)
{
return parport_ip32_dma.left;
}
/**
* parport_ip32_dma_register - initialize DMA engine
*
* Returns zero for success.
*/
static int parport_ip32_dma_register(void)
{
int err;
spin_lock_init(&parport_ip32_dma.lock);
parport_ip32_dma.irq_on = 1;
/* Reset DMA controller */
writeq(MACEPAR_CTLSTAT_RESET, &mace->perif.ctrl.parport.cntlstat);
/* Request IRQs */
err = request_irq(MACEISA_PAR_CTXA_IRQ, parport_ip32_dma_interrupt,
0, "parport_ip32", NULL);
if (err)
goto fail_a;
err = request_irq(MACEISA_PAR_CTXB_IRQ, parport_ip32_dma_interrupt,
0, "parport_ip32", NULL);
if (err)
goto fail_b;
#if DEBUG_PARPORT_IP32
/* FIXME - what is this IRQ for? */
err = request_irq(MACEISA_PAR_MERR_IRQ, parport_ip32_merr_interrupt,
0, "parport_ip32", NULL);
if (err)
goto fail_merr;
#endif
return 0;
#if DEBUG_PARPORT_IP32
fail_merr:
free_irq(MACEISA_PAR_CTXB_IRQ, NULL);
#endif
fail_b:
free_irq(MACEISA_PAR_CTXA_IRQ, NULL);
fail_a:
return err;
}
/**
* parport_ip32_dma_unregister - release and free resources for DMA engine
*/
static void parport_ip32_dma_unregister(void)
{
#if DEBUG_PARPORT_IP32
free_irq(MACEISA_PAR_MERR_IRQ, NULL);
#endif
free_irq(MACEISA_PAR_CTXB_IRQ, NULL);
free_irq(MACEISA_PAR_CTXA_IRQ, NULL);
}
/*--- Interrupt handlers and associates --------------------------------*/
/**
* parport_ip32_wakeup - wakes up code waiting for an interrupt
* @p: pointer to &struct parport
*/
static inline void parport_ip32_wakeup(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
complete(&priv->irq_complete);
}
/**
* parport_ip32_interrupt - interrupt handler
* @irq: interrupt number
* @dev_id: pointer to &struct parport
*
* Caught interrupts are forwarded to the upper parport layer if IRQ_mode is
* %PARPORT_IP32_IRQ_FWD.
*/
static irqreturn_t parport_ip32_interrupt(int irq, void *dev_id)
{
struct parport * const p = dev_id;
struct parport_ip32_private * const priv = p->physport->private_data;
enum parport_ip32_irq_mode irq_mode = priv->irq_mode;
switch (irq_mode) {
case PARPORT_IP32_IRQ_FWD:
return parport_irq_handler(irq, dev_id);
case PARPORT_IP32_IRQ_HERE:
parport_ip32_wakeup(p);
break;
}
return IRQ_HANDLED;
}
/*--- Some utility function to manipulate ECR register -----------------*/
/**
* parport_ip32_read_econtrol - read contents of the ECR register
* @p: pointer to &struct parport
*/
static inline unsigned int parport_ip32_read_econtrol(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return readb(priv->regs.ecr);
}
/**
* parport_ip32_write_econtrol - write new contents to the ECR register
* @p: pointer to &struct parport
* @c: new value to write
*/
static inline void parport_ip32_write_econtrol(struct parport *p,
unsigned int c)
{
struct parport_ip32_private * const priv = p->physport->private_data;
writeb(c, priv->regs.ecr);
}
/**
* parport_ip32_frob_econtrol - change bits from the ECR register
* @p: pointer to &struct parport
* @mask: bit mask of bits to change
* @val: new value for changed bits
*
* Read from the ECR, mask out the bits in @mask, exclusive-or with the bits
* in @val, and write the result to the ECR.
*/
static inline void parport_ip32_frob_econtrol(struct parport *p,
unsigned int mask,
unsigned int val)
{
unsigned int c;
c = (parport_ip32_read_econtrol(p) & ~mask) ^ val;
parport_ip32_write_econtrol(p, c);
}
/**
* parport_ip32_set_mode - change mode of ECP port
* @p: pointer to &struct parport
* @mode: new mode to write in ECR
*
* ECR is reset in a sane state (interrupts and DMA disabled), and placed in
* mode @mode. Go through PS2 mode if needed.
*/
static void parport_ip32_set_mode(struct parport *p, unsigned int mode)
{
unsigned int omode;
mode &= ECR_MODE_MASK;
omode = parport_ip32_read_econtrol(p) & ECR_MODE_MASK;
if (!(mode == ECR_MODE_SPP || mode == ECR_MODE_PS2
|| omode == ECR_MODE_SPP || omode == ECR_MODE_PS2)) {
/* We have to go through PS2 mode */
unsigned int ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
parport_ip32_write_econtrol(p, ecr);
}
parport_ip32_write_econtrol(p, mode | ECR_nERRINTR | ECR_SERVINTR);
}
/*--- Basic functions needed for parport -------------------------------*/
/**
* parport_ip32_read_data - return current contents of the DATA register
* @p: pointer to &struct parport
*/
static inline unsigned char parport_ip32_read_data(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return readb(priv->regs.data);
}
/**
* parport_ip32_write_data - set new contents for the DATA register
* @p: pointer to &struct parport
* @d: new value to write
*/
static inline void parport_ip32_write_data(struct parport *p, unsigned char d)
{
struct parport_ip32_private * const priv = p->physport->private_data;
writeb(d, priv->regs.data);
}
/**
* parport_ip32_read_status - return current contents of the DSR register
* @p: pointer to &struct parport
*/
static inline unsigned char parport_ip32_read_status(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return readb(priv->regs.dsr);
}
/**
* __parport_ip32_read_control - return cached contents of the DCR register
* @p: pointer to &struct parport
*/
static inline unsigned int __parport_ip32_read_control(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return priv->dcr_cache; /* use soft copy */
}
/**
* __parport_ip32_write_control - set new contents for the DCR register
* @p: pointer to &struct parport
* @c: new value to write
*/
static inline void __parport_ip32_write_control(struct parport *p,
unsigned int c)
{
struct parport_ip32_private * const priv = p->physport->private_data;
CHECK_EXTRA_BITS(p, c, priv->dcr_writable);
c &= priv->dcr_writable; /* only writable bits */
writeb(c, priv->regs.dcr);
priv->dcr_cache = c; /* update soft copy */
}
/**
* __parport_ip32_frob_control - change bits from the DCR register
* @p: pointer to &struct parport
* @mask: bit mask of bits to change
* @val: new value for changed bits
*
* This is equivalent to read from the DCR, mask out the bits in @mask,
* exclusive-or with the bits in @val, and write the result to the DCR.
* Actually, the cached contents of the DCR is used.
*/
static inline void __parport_ip32_frob_control(struct parport *p,
unsigned int mask,
unsigned int val)
{
unsigned int c;
c = (__parport_ip32_read_control(p) & ~mask) ^ val;
__parport_ip32_write_control(p, c);
}
/**
* parport_ip32_read_control - return cached contents of the DCR register
* @p: pointer to &struct parport
*
* The return value is masked so as to only return the value of %DCR_STROBE,
* %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
*/
static inline unsigned char parport_ip32_read_control(struct parport *p)
{
const unsigned int rm =
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
return __parport_ip32_read_control(p) & rm;
}
/**
* parport_ip32_write_control - set new contents for the DCR register
* @p: pointer to &struct parport
* @c: new value to write
*
* The value is masked so as to only change the value of %DCR_STROBE,
* %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
*/
static inline void parport_ip32_write_control(struct parport *p,
unsigned char c)
{
const unsigned int wm =
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
CHECK_EXTRA_BITS(p, c, wm);
__parport_ip32_frob_control(p, wm, c & wm);
}
/**
* parport_ip32_frob_control - change bits from the DCR register
* @p: pointer to &struct parport
* @mask: bit mask of bits to change
* @val: new value for changed bits
*
* This differs from __parport_ip32_frob_control() in that it only allows to
* change the value of %DCR_STROBE, %DCR_AUTOFD, %DCR_nINIT, and %DCR_SELECT.
*/
static inline unsigned char parport_ip32_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
const unsigned int wm =
DCR_STROBE | DCR_AUTOFD | DCR_nINIT | DCR_SELECT;
CHECK_EXTRA_BITS(p, mask, wm);
CHECK_EXTRA_BITS(p, val, wm);
__parport_ip32_frob_control(p, mask & wm, val & wm);
return parport_ip32_read_control(p);
}
/**
* parport_ip32_disable_irq - disable interrupts on the rising edge of nACK
* @p: pointer to &struct parport
*/
static inline void parport_ip32_disable_irq(struct parport *p)
{
__parport_ip32_frob_control(p, DCR_IRQ, 0);
}
/**
* parport_ip32_enable_irq - enable interrupts on the rising edge of nACK
* @p: pointer to &struct parport
*/
static inline void parport_ip32_enable_irq(struct parport *p)
{
__parport_ip32_frob_control(p, DCR_IRQ, DCR_IRQ);
}
/**
* parport_ip32_data_forward - enable host-to-peripheral communications
* @p: pointer to &struct parport
*
* Enable the data line drivers, for 8-bit host-to-peripheral communications.
*/
static inline void parport_ip32_data_forward(struct parport *p)
{
__parport_ip32_frob_control(p, DCR_DIR, 0);
}
/**
* parport_ip32_data_reverse - enable peripheral-to-host communications
* @p: pointer to &struct parport
*
* Place the data bus in a high impedance state, if @p->modes has the
* PARPORT_MODE_TRISTATE bit set.
*/
static inline void parport_ip32_data_reverse(struct parport *p)
{
__parport_ip32_frob_control(p, DCR_DIR, DCR_DIR);
}
/**
* parport_ip32_init_state - for core parport code
* @dev: pointer to &struct pardevice
* @s: pointer to &struct parport_state to initialize
*/
static void parport_ip32_init_state(struct pardevice *dev,
struct parport_state *s)
{
s->u.ip32.dcr = DCR_SELECT | DCR_nINIT;
s->u.ip32.ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
}
/**
* parport_ip32_save_state - for core parport code
* @p: pointer to &struct parport
* @s: pointer to &struct parport_state to save state to
*/
static void parport_ip32_save_state(struct parport *p,
struct parport_state *s)
{
s->u.ip32.dcr = __parport_ip32_read_control(p);
s->u.ip32.ecr = parport_ip32_read_econtrol(p);
}
/**
* parport_ip32_restore_state - for core parport code
* @p: pointer to &struct parport
* @s: pointer to &struct parport_state to restore state from
*/
static void parport_ip32_restore_state(struct parport *p,
struct parport_state *s)
{
parport_ip32_set_mode(p, s->u.ip32.ecr & ECR_MODE_MASK);
parport_ip32_write_econtrol(p, s->u.ip32.ecr);
__parport_ip32_write_control(p, s->u.ip32.dcr);
}
/*--- EPP mode functions -----------------------------------------------*/
/**
* parport_ip32_clear_epp_timeout - clear Timeout bit in EPP mode
* @p: pointer to &struct parport
*
* Returns 1 if the Timeout bit is clear, and 0 otherwise.
*/
static unsigned int parport_ip32_clear_epp_timeout(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
unsigned int cleared;
if (!(parport_ip32_read_status(p) & DSR_TIMEOUT))
cleared = 1;
else {
unsigned int r;
/* To clear timeout some chips require double read */
parport_ip32_read_status(p);
r = parport_ip32_read_status(p);
/* Some reset by writing 1 */
writeb(r | DSR_TIMEOUT, priv->regs.dsr);
/* Others by writing 0 */
writeb(r & ~DSR_TIMEOUT, priv->regs.dsr);
r = parport_ip32_read_status(p);
cleared = !(r & DSR_TIMEOUT);
}
pr_trace(p, "(): %s", cleared ? "cleared" : "failed");
return cleared;
}
/**
* parport_ip32_epp_read - generic EPP read function
* @eppreg: I/O register to read from
* @p: pointer to &struct parport
* @buf: buffer to store read data
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_read(void __iomem *eppreg,
struct parport *p, void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
size_t got;
parport_ip32_set_mode(p, ECR_MODE_EPP);
parport_ip32_data_reverse(p);
parport_ip32_write_control(p, DCR_nINIT);
if ((flags & PARPORT_EPP_FAST) && (len > 1)) {
readsb(eppreg, buf, len);
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
parport_ip32_clear_epp_timeout(p);
return -EIO;
}
got = len;
} else {
u8 *bufp = buf;
for (got = 0; got < len; got++) {
*bufp++ = readb(eppreg);
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
parport_ip32_clear_epp_timeout(p);
break;
}
}
}
parport_ip32_data_forward(p);
parport_ip32_set_mode(p, ECR_MODE_PS2);
return got;
}
/**
* parport_ip32_epp_write - generic EPP write function
* @eppreg: I/O register to write to
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_write(void __iomem *eppreg,
struct parport *p, const void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
size_t written;
parport_ip32_set_mode(p, ECR_MODE_EPP);
parport_ip32_data_forward(p);
parport_ip32_write_control(p, DCR_nINIT);
if ((flags & PARPORT_EPP_FAST) && (len > 1)) {
writesb(eppreg, buf, len);
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
parport_ip32_clear_epp_timeout(p);
return -EIO;
}
written = len;
} else {
const u8 *bufp = buf;
for (written = 0; written < len; written++) {
writeb(*bufp++, eppreg);
if (readb(priv->regs.dsr) & DSR_TIMEOUT) {
parport_ip32_clear_epp_timeout(p);
break;
}
}
}
parport_ip32_set_mode(p, ECR_MODE_PS2);
return written;
}
/**
* parport_ip32_epp_read_data - read a block of data in EPP mode
* @p: pointer to &struct parport
* @buf: buffer to store read data
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_read_data(struct parport *p, void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return parport_ip32_epp_read(priv->regs.eppData0, p, buf, len, flags);
}
/**
* parport_ip32_epp_write_data - write a block of data in EPP mode
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_write_data(struct parport *p, const void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return parport_ip32_epp_write(priv->regs.eppData0, p, buf, len, flags);
}
/**
* parport_ip32_epp_read_addr - read a block of addresses in EPP mode
* @p: pointer to &struct parport
* @buf: buffer to store read data
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_read_addr(struct parport *p, void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return parport_ip32_epp_read(priv->regs.eppAddr, p, buf, len, flags);
}
/**
* parport_ip32_epp_write_addr - write a block of addresses in EPP mode
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
* @flags: may be PARPORT_EPP_FAST
*/
static size_t parport_ip32_epp_write_addr(struct parport *p, const void *buf,
size_t len, int flags)
{
struct parport_ip32_private * const priv = p->physport->private_data;
return parport_ip32_epp_write(priv->regs.eppAddr, p, buf, len, flags);
}
/*--- ECP mode functions (FIFO) ----------------------------------------*/
/**
* parport_ip32_fifo_wait_break - check if the waiting function should return
* @p: pointer to &struct parport
* @expire: timeout expiring date, in jiffies
*
* parport_ip32_fifo_wait_break() checks if the waiting function should return
* immediately or not. The break conditions are:
* - expired timeout;
* - a pending signal;
* - nFault asserted low.
* This function also calls cond_resched().
*/
static unsigned int parport_ip32_fifo_wait_break(struct parport *p,
unsigned long expire)
{
cond_resched();
if (time_after(jiffies, expire)) {
pr_debug1(PPIP32 "%s: FIFO write timed out\n", p->name);
return 1;
}
if (signal_pending(current)) {
pr_debug1(PPIP32 "%s: Signal pending\n", p->name);
return 1;
}
if (!(parport_ip32_read_status(p) & DSR_nFAULT)) {
pr_debug1(PPIP32 "%s: nFault asserted low\n", p->name);
return 1;
}
return 0;
}
/**
* parport_ip32_fwp_wait_polling - wait for FIFO to empty (polling)
* @p: pointer to &struct parport
*
* Returns the number of bytes that can safely be written in the FIFO. A
* return value of zero means that the calling function should terminate as
* fast as possible.
*/
static unsigned int parport_ip32_fwp_wait_polling(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport * const physport = p->physport;
unsigned long expire;
unsigned int count;
unsigned int ecr;
expire = jiffies + physport->cad->timeout;
count = 0;
while (1) {
if (parport_ip32_fifo_wait_break(p, expire))
break;
/* Check FIFO state. We do nothing when the FIFO is nor full,
* nor empty. It appears that the FIFO full bit is not always
* reliable, the FIFO state is sometimes wrongly reported, and
* the chip gets confused if we give it another byte. */
ecr = parport_ip32_read_econtrol(p);
if (ecr & ECR_F_EMPTY) {
/* FIFO is empty, fill it up */
count = priv->fifo_depth;
break;
}
/* Wait a moment... */
udelay(FIFO_POLLING_INTERVAL);
} /* while (1) */
return count;
}
/**
* parport_ip32_fwp_wait_interrupt - wait for FIFO to empty (interrupt-driven)
* @p: pointer to &struct parport
*
* Returns the number of bytes that can safely be written in the FIFO. A
* return value of zero means that the calling function should terminate as
* fast as possible.
*/
static unsigned int parport_ip32_fwp_wait_interrupt(struct parport *p)
{
static unsigned int lost_interrupt = 0;
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport * const physport = p->physport;
unsigned long nfault_timeout;
unsigned long expire;
unsigned int count;
unsigned int ecr;
nfault_timeout = min((unsigned long)physport->cad->timeout,
msecs_to_jiffies(FIFO_NFAULT_TIMEOUT));
expire = jiffies + physport->cad->timeout;
count = 0;
while (1) {
if (parport_ip32_fifo_wait_break(p, expire))
break;
/* Initialize mutex used to take interrupts into account */
reinit_completion(&priv->irq_complete);
/* Enable serviceIntr */
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
/* Enabling serviceIntr while the FIFO is empty does not
* always generate an interrupt, so check for emptiness
* now. */
ecr = parport_ip32_read_econtrol(p);
if (!(ecr & ECR_F_EMPTY)) {
/* FIFO is not empty: wait for an interrupt or a
* timeout to occur */
wait_for_completion_interruptible_timeout(
&priv->irq_complete, nfault_timeout);
ecr = parport_ip32_read_econtrol(p);
if ((ecr & ECR_F_EMPTY) && !(ecr & ECR_SERVINTR)
&& !lost_interrupt) {
pr_warn(PPIP32 "%s: lost interrupt in %s\n",
p->name, __func__);
lost_interrupt = 1;
}
}
/* Disable serviceIntr */
parport_ip32_frob_econtrol(p, ECR_SERVINTR, ECR_SERVINTR);
/* Check FIFO state */
if (ecr & ECR_F_EMPTY) {
/* FIFO is empty, fill it up */
count = priv->fifo_depth;
break;
} else if (ecr & ECR_SERVINTR) {
/* FIFO is not empty, but we know that can safely push
* writeIntrThreshold bytes into it */
count = priv->writeIntrThreshold;
break;
}
/* FIFO is not empty, and we did not get any interrupt.
* Either it's time to check for nFault, or a signal is
* pending. This is verified in
* parport_ip32_fifo_wait_break(), so we continue the loop. */
} /* while (1) */
return count;
}
/**
* parport_ip32_fifo_write_block_pio - write a block of data (PIO mode)
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
*
* Uses PIO to write the contents of the buffer @buf into the parallel port
* FIFO. Returns the number of bytes that were actually written. It can work
* with or without the help of interrupts. The parallel port must be
* correctly initialized before calling parport_ip32_fifo_write_block_pio().
*/
static size_t parport_ip32_fifo_write_block_pio(struct parport *p,
const void *buf, size_t len)
{
struct parport_ip32_private * const priv = p->physport->private_data;
const u8 *bufp = buf;
size_t left = len;
priv->irq_mode = PARPORT_IP32_IRQ_HERE;
while (left > 0) {
unsigned int count;
count = (p->irq == PARPORT_IRQ_NONE) ?
parport_ip32_fwp_wait_polling(p) :
parport_ip32_fwp_wait_interrupt(p);
if (count == 0)
break; /* Transmission should be stopped */
if (count > left)
count = left;
if (count == 1) {
writeb(*bufp, priv->regs.fifo);
bufp++, left--;
} else {
writesb(priv->regs.fifo, bufp, count);
bufp += count, left -= count;
}
}
priv->irq_mode = PARPORT_IP32_IRQ_FWD;
return len - left;
}
/**
* parport_ip32_fifo_write_block_dma - write a block of data (DMA mode)
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
*
* Uses DMA to write the contents of the buffer @buf into the parallel port
* FIFO. Returns the number of bytes that were actually written. The
* parallel port must be correctly initialized before calling
* parport_ip32_fifo_write_block_dma().
*/
static size_t parport_ip32_fifo_write_block_dma(struct parport *p,
const void *buf, size_t len)
{
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport * const physport = p->physport;
unsigned long nfault_timeout;
unsigned long expire;
size_t written;
unsigned int ecr;
priv->irq_mode = PARPORT_IP32_IRQ_HERE;
parport_ip32_dma_start(p, DMA_TO_DEVICE, (void *)buf, len);
reinit_completion(&priv->irq_complete);
parport_ip32_frob_econtrol(p, ECR_DMAEN | ECR_SERVINTR, ECR_DMAEN);
nfault_timeout = min((unsigned long)physport->cad->timeout,
msecs_to_jiffies(FIFO_NFAULT_TIMEOUT));
expire = jiffies + physport->cad->timeout;
while (1) {
if (parport_ip32_fifo_wait_break(p, expire))
break;
wait_for_completion_interruptible_timeout(&priv->irq_complete,
nfault_timeout);
ecr = parport_ip32_read_econtrol(p);
if (ecr & ECR_SERVINTR)
break; /* DMA transfer just finished */
}
parport_ip32_dma_stop(p);
written = len - parport_ip32_dma_get_residue();
priv->irq_mode = PARPORT_IP32_IRQ_FWD;
return written;
}
/**
* parport_ip32_fifo_write_block - write a block of data
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
*
* Uses PIO or DMA to write the contents of the buffer @buf into the parallel
* p FIFO. Returns the number of bytes that were actually written.
*/
static size_t parport_ip32_fifo_write_block(struct parport *p,
const void *buf, size_t len)
{
size_t written = 0;
if (len)
/* FIXME - Maybe some threshold value should be set for @len
* under which we revert to PIO mode? */
written = (p->modes & PARPORT_MODE_DMA) ?
parport_ip32_fifo_write_block_dma(p, buf, len) :
parport_ip32_fifo_write_block_pio(p, buf, len);
return written;
}
/**
* parport_ip32_drain_fifo - wait for FIFO to empty
* @p: pointer to &struct parport
* @timeout: timeout, in jiffies
*
* This function waits for FIFO to empty. It returns 1 when FIFO is empty, or
* 0 if the timeout @timeout is reached before, or if a signal is pending.
*/
static unsigned int parport_ip32_drain_fifo(struct parport *p,
unsigned long timeout)
{
unsigned long expire = jiffies + timeout;
unsigned int polling_interval;
unsigned int counter;
/* Busy wait for approx. 200us */
for (counter = 0; counter < 40; counter++) {
if (parport_ip32_read_econtrol(p) & ECR_F_EMPTY)
break;
if (time_after(jiffies, expire))
break;
if (signal_pending(current))
break;
udelay(5);
}
/* Poll slowly. Polling interval starts with 1 millisecond, and is
* increased exponentially until 128. */
polling_interval = 1; /* msecs */
while (!(parport_ip32_read_econtrol(p) & ECR_F_EMPTY)) {
if (time_after_eq(jiffies, expire))
break;
msleep_interruptible(polling_interval);
if (signal_pending(current))
break;
if (polling_interval < 128)
polling_interval *= 2;
}
return !!(parport_ip32_read_econtrol(p) & ECR_F_EMPTY);
}
/**
* parport_ip32_get_fifo_residue - reset FIFO
* @p: pointer to &struct parport
* @mode: current operation mode (ECR_MODE_PPF or ECR_MODE_ECP)
*
* This function resets FIFO, and returns the number of bytes remaining in it.
*/
static unsigned int parport_ip32_get_fifo_residue(struct parport *p,
unsigned int mode)
{
struct parport_ip32_private * const priv = p->physport->private_data;
unsigned int residue;
unsigned int cnfga;
/* FIXME - We are missing one byte if the printer is off-line. I
* don't know how to detect this. It looks that the full bit is not
* always reliable. For the moment, the problem is avoided in most
* cases by testing for BUSY in parport_ip32_compat_write_data().
*/
if (parport_ip32_read_econtrol(p) & ECR_F_EMPTY)
residue = 0;
else {
pr_debug1(PPIP32 "%s: FIFO is stuck\n", p->name);
/* Stop all transfers.
*
* Microsoft's document instructs to drive DCR_STROBE to 0,
* but it doesn't work (at least in Compatibility mode, not
* tested in ECP mode). Switching directly to Test mode (as
* in parport_pc) is not an option: it does confuse the port,
* ECP service interrupts are no more working after that. A
* hard reset is then needed to revert to a sane state.
*
* Let's hope that the FIFO is really stuck and that the
* peripheral doesn't wake up now.
*/
parport_ip32_frob_control(p, DCR_STROBE, 0);
/* Fill up FIFO */
for (residue = priv->fifo_depth; residue > 0; residue--) {
if (parport_ip32_read_econtrol(p) & ECR_F_FULL)
break;
writeb(0x00, priv->regs.fifo);
}
}
if (residue)
pr_debug1(PPIP32 "%s: %d PWord%s left in FIFO\n",
p->name, residue,
(residue == 1) ? " was" : "s were");
/* Now reset the FIFO */
parport_ip32_set_mode(p, ECR_MODE_PS2);
/* Host recovery for ECP mode */
if (mode == ECR_MODE_ECP) {
parport_ip32_data_reverse(p);
parport_ip32_frob_control(p, DCR_nINIT, 0);
if (parport_wait_peripheral(p, DSR_PERROR, 0))
pr_debug1(PPIP32 "%s: PEerror timeout 1 in %s\n",
p->name, __func__);
parport_ip32_frob_control(p, DCR_STROBE, DCR_STROBE);
parport_ip32_frob_control(p, DCR_nINIT, DCR_nINIT);
if (parport_wait_peripheral(p, DSR_PERROR, DSR_PERROR))
pr_debug1(PPIP32 "%s: PEerror timeout 2 in %s\n",
p->name, __func__);
}
/* Adjust residue if needed */
parport_ip32_set_mode(p, ECR_MODE_CFG);
cnfga = readb(priv->regs.cnfgA);
if (!(cnfga & CNFGA_nBYTEINTRANS)) {
pr_debug1(PPIP32 "%s: cnfgA contains 0x%02x\n",
p->name, cnfga);
pr_debug1(PPIP32 "%s: Accounting for extra byte\n",
p->name);
residue++;
}
/* Don't care about partial PWords since we do not support
* PWord != 1 byte. */
/* Back to forward PS2 mode. */
parport_ip32_set_mode(p, ECR_MODE_PS2);
parport_ip32_data_forward(p);
return residue;
}
/**
* parport_ip32_compat_write_data - write a block of data in SPP mode
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
* @flags: ignored
*/
static size_t parport_ip32_compat_write_data(struct parport *p,
const void *buf, size_t len,
int flags)
{
static unsigned int ready_before = 1;
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport * const physport = p->physport;
size_t written = 0;
/* Special case: a timeout of zero means we cannot call schedule().
* Also if O_NONBLOCK is set then use the default implementation. */
if (physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
return parport_ieee1284_write_compat(p, buf, len, flags);
/* Reset FIFO, go in forward mode, and disable ackIntEn */
parport_ip32_set_mode(p, ECR_MODE_PS2);
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
parport_ip32_data_forward(p);
parport_ip32_disable_irq(p);
parport_ip32_set_mode(p, ECR_MODE_PPF);
physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* Wait for peripheral to become ready */
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
DSR_nBUSY | DSR_nFAULT)) {
/* Avoid to flood the logs */
if (ready_before)
pr_info(PPIP32 "%s: not ready in %s\n",
p->name, __func__);
ready_before = 0;
goto stop;
}
ready_before = 1;
written = parport_ip32_fifo_write_block(p, buf, len);
/* Wait FIFO to empty. Timeout is proportional to FIFO_depth. */
parport_ip32_drain_fifo(p, physport->cad->timeout * priv->fifo_depth);
/* Check for a potential residue */
written -= parport_ip32_get_fifo_residue(p, ECR_MODE_PPF);
/* Then, wait for BUSY to get low. */
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
printk(KERN_DEBUG PPIP32 "%s: BUSY timeout in %s\n",
p->name, __func__);
stop:
/* Reset FIFO */
parport_ip32_set_mode(p, ECR_MODE_PS2);
physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
}
/*
* FIXME - Insert here parport_ip32_ecp_read_data().
*/
/**
* parport_ip32_ecp_write_data - write a block of data in ECP mode
* @p: pointer to &struct parport
* @buf: buffer of data to write
* @len: length of buffer @buf
* @flags: ignored
*/
static size_t parport_ip32_ecp_write_data(struct parport *p,
const void *buf, size_t len,
int flags)
{
static unsigned int ready_before = 1;
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport * const physport = p->physport;
size_t written = 0;
/* Special case: a timeout of zero means we cannot call schedule().
* Also if O_NONBLOCK is set then use the default implementation. */
if (physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
return parport_ieee1284_ecp_write_data(p, buf, len, flags);
/* Negotiate to forward mode if necessary. */
if (physport->ieee1284.phase != IEEE1284_PH_FWD_IDLE) {
/* Event 47: Set nInit high. */
parport_ip32_frob_control(p, DCR_nINIT | DCR_AUTOFD,
DCR_nINIT | DCR_AUTOFD);
/* Event 49: PError goes high. */
if (parport_wait_peripheral(p, DSR_PERROR, DSR_PERROR)) {
printk(KERN_DEBUG PPIP32 "%s: PError timeout in %s\n",
p->name, __func__);
physport->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
return 0;
}
}
/* Reset FIFO, go in forward mode, and disable ackIntEn */
parport_ip32_set_mode(p, ECR_MODE_PS2);
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
parport_ip32_data_forward(p);
parport_ip32_disable_irq(p);
parport_ip32_set_mode(p, ECR_MODE_ECP);
physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* Wait for peripheral to become ready */
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
DSR_nBUSY | DSR_nFAULT)) {
/* Avoid to flood the logs */
if (ready_before)
pr_info(PPIP32 "%s: not ready in %s\n",
p->name, __func__);
ready_before = 0;
goto stop;
}
ready_before = 1;
written = parport_ip32_fifo_write_block(p, buf, len);
/* Wait FIFO to empty. Timeout is proportional to FIFO_depth. */
parport_ip32_drain_fifo(p, physport->cad->timeout * priv->fifo_depth);
/* Check for a potential residue */
written -= parport_ip32_get_fifo_residue(p, ECR_MODE_ECP);
/* Then, wait for BUSY to get low. */
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
printk(KERN_DEBUG PPIP32 "%s: BUSY timeout in %s\n",
p->name, __func__);
stop:
/* Reset FIFO */
parport_ip32_set_mode(p, ECR_MODE_PS2);
physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
}
/*
* FIXME - Insert here parport_ip32_ecp_write_addr().
*/
/*--- Default parport operations ---------------------------------------*/
static const struct parport_operations parport_ip32_ops __initconst = {
.write_data = parport_ip32_write_data,
.read_data = parport_ip32_read_data,
.write_control = parport_ip32_write_control,
.read_control = parport_ip32_read_control,
.frob_control = parport_ip32_frob_control,
.read_status = parport_ip32_read_status,
.enable_irq = parport_ip32_enable_irq,
.disable_irq = parport_ip32_disable_irq,
.data_forward = parport_ip32_data_forward,
.data_reverse = parport_ip32_data_reverse,
.init_state = parport_ip32_init_state,
.save_state = parport_ip32_save_state,
.restore_state = parport_ip32_restore_state,
.epp_write_data = parport_ieee1284_epp_write_data,
.epp_read_data = parport_ieee1284_epp_read_data,
.epp_write_addr = parport_ieee1284_epp_write_addr,
.epp_read_addr = parport_ieee1284_epp_read_addr,
.ecp_write_data = parport_ieee1284_ecp_write_data,
.ecp_read_data = parport_ieee1284_ecp_read_data,
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
.compat_write_data = parport_ieee1284_write_compat,
.nibble_read_data = parport_ieee1284_read_nibble,
.byte_read_data = parport_ieee1284_read_byte,
.owner = THIS_MODULE,
};
/*--- Device detection -------------------------------------------------*/
/**
* parport_ip32_ecp_supported - check for an ECP port
* @p: pointer to the &parport structure
*
* Returns 1 if an ECP port is found, and 0 otherwise. This function actually
* checks if an Extended Control Register seems to be present. On successful
* return, the port is placed in SPP mode.
*/
static __init unsigned int parport_ip32_ecp_supported(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
unsigned int ecr;
ecr = ECR_MODE_PS2 | ECR_nERRINTR | ECR_SERVINTR;
writeb(ecr, priv->regs.ecr);
if (readb(priv->regs.ecr) != (ecr | ECR_F_EMPTY))
goto fail;
pr_probe(p, "Found working ECR register\n");
parport_ip32_set_mode(p, ECR_MODE_SPP);
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
return 1;
fail:
pr_probe(p, "ECR register not found\n");
return 0;
}
/**
* parport_ip32_fifo_supported - check for FIFO parameters
* @p: pointer to the &parport structure
*
* Check for FIFO parameters of an Extended Capabilities Port. Returns 1 on
* success, and 0 otherwise. Adjust FIFO parameters in the parport structure.
* On return, the port is placed in SPP mode.
*/
static __init unsigned int parport_ip32_fifo_supported(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
unsigned int configa, configb;
unsigned int pword;
unsigned int i;
/* Configuration mode */
parport_ip32_set_mode(p, ECR_MODE_CFG);
configa = readb(priv->regs.cnfgA);
configb = readb(priv->regs.cnfgB);
/* Find out PWord size */
switch (configa & CNFGA_ID_MASK) {
case CNFGA_ID_8:
pword = 1;
break;
case CNFGA_ID_16:
pword = 2;
break;
case CNFGA_ID_32:
pword = 4;
break;
default:
pr_probe(p, "Unknown implementation ID: 0x%0x\n",
(configa & CNFGA_ID_MASK) >> CNFGA_ID_SHIFT);
goto fail;
break;
}
if (pword != 1) {
pr_probe(p, "Unsupported PWord size: %u\n", pword);
goto fail;
}
priv->pword = pword;
pr_probe(p, "PWord is %u bits\n", 8 * priv->pword);
/* Check for compression support */
writeb(configb | CNFGB_COMPRESS, priv->regs.cnfgB);
if (readb(priv->regs.cnfgB) & CNFGB_COMPRESS)
pr_probe(p, "Hardware compression detected (unsupported)\n");
writeb(configb & ~CNFGB_COMPRESS, priv->regs.cnfgB);
/* Reset FIFO and go in test mode (no interrupt, no DMA) */
parport_ip32_set_mode(p, ECR_MODE_TST);
/* FIFO must be empty now */
if (!(readb(priv->regs.ecr) & ECR_F_EMPTY)) {
pr_probe(p, "FIFO not reset\n");
goto fail;
}
/* Find out FIFO depth. */
priv->fifo_depth = 0;
for (i = 0; i < 1024; i++) {
if (readb(priv->regs.ecr) & ECR_F_FULL) {
/* FIFO full */
priv->fifo_depth = i;
break;
}
writeb((u8)i, priv->regs.fifo);
}
if (i >= 1024) {
pr_probe(p, "Can't fill FIFO\n");
goto fail;
}
if (!priv->fifo_depth) {
pr_probe(p, "Can't get FIFO depth\n");
goto fail;
}
pr_probe(p, "FIFO is %u PWords deep\n", priv->fifo_depth);
/* Enable interrupts */
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
/* Find out writeIntrThreshold: number of PWords we know we can write
* if we get an interrupt. */
priv->writeIntrThreshold = 0;
for (i = 0; i < priv->fifo_depth; i++) {
if (readb(priv->regs.fifo) != (u8)i) {
pr_probe(p, "Invalid data in FIFO\n");
goto fail;
}
if (!priv->writeIntrThreshold
&& readb(priv->regs.ecr) & ECR_SERVINTR)
/* writeIntrThreshold reached */
priv->writeIntrThreshold = i + 1;
if (i + 1 < priv->fifo_depth
&& readb(priv->regs.ecr) & ECR_F_EMPTY) {
/* FIFO empty before the last byte? */
pr_probe(p, "Data lost in FIFO\n");
goto fail;
}
}
if (!priv->writeIntrThreshold) {
pr_probe(p, "Can't get writeIntrThreshold\n");
goto fail;
}
pr_probe(p, "writeIntrThreshold is %u\n", priv->writeIntrThreshold);
/* FIFO must be empty now */
if (!(readb(priv->regs.ecr) & ECR_F_EMPTY)) {
pr_probe(p, "Can't empty FIFO\n");
goto fail;
}
/* Reset FIFO */
parport_ip32_set_mode(p, ECR_MODE_PS2);
/* Set reverse direction (must be in PS2 mode) */
parport_ip32_data_reverse(p);
/* Test FIFO, no interrupt, no DMA */
parport_ip32_set_mode(p, ECR_MODE_TST);
/* Enable interrupts */
parport_ip32_frob_econtrol(p, ECR_SERVINTR, 0);
/* Find out readIntrThreshold: number of PWords we can read if we get
* an interrupt. */
priv->readIntrThreshold = 0;
for (i = 0; i < priv->fifo_depth; i++) {
writeb(0xaa, priv->regs.fifo);
if (readb(priv->regs.ecr) & ECR_SERVINTR) {
/* readIntrThreshold reached */
priv->readIntrThreshold = i + 1;
break;
}
}
if (!priv->readIntrThreshold) {
pr_probe(p, "Can't get readIntrThreshold\n");
goto fail;
}
pr_probe(p, "readIntrThreshold is %u\n", priv->readIntrThreshold);
/* Reset ECR */
parport_ip32_set_mode(p, ECR_MODE_PS2);
parport_ip32_data_forward(p);
parport_ip32_set_mode(p, ECR_MODE_SPP);
return 1;
fail:
priv->fifo_depth = 0;
parport_ip32_set_mode(p, ECR_MODE_SPP);
return 0;
}
/*--- Initialization code ----------------------------------------------*/
/**
* parport_ip32_make_isa_registers - compute (ISA) register addresses
* @regs: pointer to &struct parport_ip32_regs to fill
* @base: base address of standard and EPP registers
* @base_hi: base address of ECP registers
* @regshift: how much to shift register offset by
*
* Compute register addresses, according to the ISA standard. The addresses
* of the standard and EPP registers are computed from address @base. The
* addresses of the ECP registers are computed from address @base_hi.
*/
static void __init
parport_ip32_make_isa_registers(struct parport_ip32_regs *regs,
void __iomem *base, void __iomem *base_hi,
unsigned int regshift)
{
#define r_base(offset) ((u8 __iomem *)base + ((offset) << regshift))
#define r_base_hi(offset) ((u8 __iomem *)base_hi + ((offset) << regshift))
*regs = (struct parport_ip32_regs){
.data = r_base(0),
.dsr = r_base(1),
.dcr = r_base(2),
.eppAddr = r_base(3),
.eppData0 = r_base(4),
.eppData1 = r_base(5),
.eppData2 = r_base(6),
.eppData3 = r_base(7),
.ecpAFifo = r_base(0),
.fifo = r_base_hi(0),
.cnfgA = r_base_hi(0),
.cnfgB = r_base_hi(1),
.ecr = r_base_hi(2)
};
#undef r_base_hi
#undef r_base
}
/**
* parport_ip32_probe_port - probe and register IP32 built-in parallel port
*
* Returns the new allocated &parport structure. On error, an error code is
* encoded in return value with the ERR_PTR function.
*/
static __init struct parport *parport_ip32_probe_port(void)
{
struct parport_ip32_regs regs;
struct parport_ip32_private *priv = NULL;
struct parport_operations *ops = NULL;
struct parport *p = NULL;
int err;
parport_ip32_make_isa_registers(&regs, &mace->isa.parallel,
&mace->isa.ecp1284, 8 /* regshift */);
ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
priv = kmalloc(sizeof(struct parport_ip32_private), GFP_KERNEL);
p = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, ops);
if (ops == NULL || priv == NULL || p == NULL) {
err = -ENOMEM;
goto fail;
}
p->base = MACE_BASE + offsetof(struct sgi_mace, isa.parallel);
p->base_hi = MACE_BASE + offsetof(struct sgi_mace, isa.ecp1284);
p->private_data = priv;
*ops = parport_ip32_ops;
*priv = (struct parport_ip32_private){
.regs = regs,
.dcr_writable = DCR_DIR | DCR_SELECT | DCR_nINIT |
DCR_AUTOFD | DCR_STROBE,
.irq_mode = PARPORT_IP32_IRQ_FWD,
};
init_completion(&priv->irq_complete);
/* Probe port. */
if (!parport_ip32_ecp_supported(p)) {
err = -ENODEV;
goto fail;
}
parport_ip32_dump_state(p, "begin init", 0);
/* We found what looks like a working ECR register. Simply assume
* that all modes are correctly supported. Enable basic modes. */
p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
p->modes |= PARPORT_MODE_TRISTATE;
if (!parport_ip32_fifo_supported(p)) {
pr_warn(PPIP32 "%s: error: FIFO disabled\n", p->name);
/* Disable hardware modes depending on a working FIFO. */
features &= ~PARPORT_IP32_ENABLE_SPP;
features &= ~PARPORT_IP32_ENABLE_ECP;
/* DMA is not needed if FIFO is not supported. */
features &= ~PARPORT_IP32_ENABLE_DMA;
}
/* Request IRQ */
if (features & PARPORT_IP32_ENABLE_IRQ) {
int irq = MACEISA_PARALLEL_IRQ;
if (request_irq(irq, parport_ip32_interrupt, 0, p->name, p)) {
pr_warn(PPIP32 "%s: error: IRQ disabled\n", p->name);
/* DMA cannot work without interrupts. */
features &= ~PARPORT_IP32_ENABLE_DMA;
} else {
pr_probe(p, "Interrupt support enabled\n");
p->irq = irq;
priv->dcr_writable |= DCR_IRQ;
}
}
/* Allocate DMA resources */
if (features & PARPORT_IP32_ENABLE_DMA) {
if (parport_ip32_dma_register())
pr_warn(PPIP32 "%s: error: DMA disabled\n", p->name);
else {
pr_probe(p, "DMA support enabled\n");
p->dma = 0; /* arbitrary value != PARPORT_DMA_NONE */
p->modes |= PARPORT_MODE_DMA;
}
}
if (features & PARPORT_IP32_ENABLE_SPP) {
/* Enable compatibility FIFO mode */
p->ops->compat_write_data = parport_ip32_compat_write_data;
p->modes |= PARPORT_MODE_COMPAT;
pr_probe(p, "Hardware support for SPP mode enabled\n");
}
if (features & PARPORT_IP32_ENABLE_EPP) {
/* Set up access functions to use EPP hardware. */
p->ops->epp_read_data = parport_ip32_epp_read_data;
p->ops->epp_write_data = parport_ip32_epp_write_data;
p->ops->epp_read_addr = parport_ip32_epp_read_addr;
p->ops->epp_write_addr = parport_ip32_epp_write_addr;
p->modes |= PARPORT_MODE_EPP;
pr_probe(p, "Hardware support for EPP mode enabled\n");
}
if (features & PARPORT_IP32_ENABLE_ECP) {
/* Enable ECP FIFO mode */
p->ops->ecp_write_data = parport_ip32_ecp_write_data;
/* FIXME - not implemented */
/* p->ops->ecp_read_data = parport_ip32_ecp_read_data; */
/* p->ops->ecp_write_addr = parport_ip32_ecp_write_addr; */
p->modes |= PARPORT_MODE_ECP;
pr_probe(p, "Hardware support for ECP mode enabled\n");
}
/* Initialize the port with sensible values */
parport_ip32_set_mode(p, ECR_MODE_PS2);
parport_ip32_write_control(p, DCR_SELECT | DCR_nINIT);
parport_ip32_data_forward(p);
parport_ip32_disable_irq(p);
parport_ip32_write_data(p, 0x00);
parport_ip32_dump_state(p, "end init", 0);
/* Print out what we found */
pr_info("%s: SGI IP32 at 0x%lx (0x%lx)", p->name, p->base, p->base_hi);
if (p->irq != PARPORT_IRQ_NONE)
pr_cont(", irq %d", p->irq);
pr_cont(" [");
#define printmode(x) \
do { \
if (p->modes & PARPORT_MODE_##x) \
pr_cont("%s%s", f++ ? "," : "", #x); \
} while (0)
{
unsigned int f = 0;
printmode(PCSPP);
printmode(TRISTATE);
printmode(COMPAT);
printmode(EPP);
printmode(ECP);
printmode(DMA);
}
#undef printmode
pr_cont("]\n");
parport_announce_port(p);
return p;
fail:
if (p)
parport_put_port(p);
kfree(priv);
kfree(ops);
return ERR_PTR(err);
}
/**
* parport_ip32_unregister_port - unregister a parallel port
* @p: pointer to the &struct parport
*
* Unregisters a parallel port and free previously allocated resources
* (memory, IRQ, ...).
*/
static __exit void parport_ip32_unregister_port(struct parport *p)
{
struct parport_ip32_private * const priv = p->physport->private_data;
struct parport_operations *ops = p->ops;
parport_remove_port(p);
if (p->modes & PARPORT_MODE_DMA)
parport_ip32_dma_unregister();
if (p->irq != PARPORT_IRQ_NONE)
free_irq(p->irq, p);
parport_put_port(p);
kfree(priv);
kfree(ops);
}
/**
* parport_ip32_init - module initialization function
*/
static int __init parport_ip32_init(void)
{
pr_info(PPIP32 "SGI IP32 built-in parallel port driver v0.6\n");
this_port = parport_ip32_probe_port();
return PTR_ERR_OR_ZERO(this_port);
}
/**
* parport_ip32_exit - module termination function
*/
static void __exit parport_ip32_exit(void)
{
parport_ip32_unregister_port(this_port);
}
/*--- Module stuff -----------------------------------------------------*/
MODULE_AUTHOR("Arnaud Giersch <arnaud.giersch@free.fr>");
MODULE_DESCRIPTION("SGI IP32 built-in parallel port driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.6"); /* update in parport_ip32_init() too */
module_init(parport_ip32_init);
module_exit(parport_ip32_exit);
module_param(verbose_probing, bool, S_IRUGO);
MODULE_PARM_DESC(verbose_probing, "Log chit-chat during initialization");
module_param(features, uint, S_IRUGO);
MODULE_PARM_DESC(features,
"Bit mask of features to enable"
", bit 0: IRQ support"
", bit 1: DMA support"
", bit 2: hardware SPP mode"
", bit 3: hardware EPP mode"
", bit 4: hardware ECP mode");