diff options
Diffstat (limited to 'drivers/parport')
| -rw-r--r-- | drivers/parport/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/parport/Makefile | 1 | ||||
| -rw-r--r-- | drivers/parport/parport_ip32.c | 2253 |
3 files changed, 2263 insertions, 0 deletions
diff --git a/drivers/parport/Kconfig b/drivers/parport/Kconfig index f605dea5722..f63c387976c 100644 --- a/drivers/parport/Kconfig +++ b/drivers/parport/Kconfig @@ -90,6 +90,15 @@ config PARPORT_ARC depends on ARM && PARPORT select PARPORT_NOT_PC +config PARPORT_IP32 + tristate "SGI IP32 builtin port (EXPERIMENTAL)" + depends on SGI_IP32 && PARPORT && EXPERIMENTAL + select PARPORT_NOT_PC + help + Say Y here if you need support for the parallel port on + SGI O2 machines. This code is also available as a module (say M), + called parport_ip32. If in doubt, saying N is the safe plan. + config PARPORT_AMIGA tristate "Amiga builtin port" depends on AMIGA && PARPORT diff --git a/drivers/parport/Makefile b/drivers/parport/Makefile index 5372212bb9d..a19de35f8de 100644 --- a/drivers/parport/Makefile +++ b/drivers/parport/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_PARPORT_MFC3) += parport_mfc3.o obj-$(CONFIG_PARPORT_ATARI) += parport_atari.o obj-$(CONFIG_PARPORT_SUNBPP) += parport_sunbpp.o obj-$(CONFIG_PARPORT_GSC) += parport_gsc.o +obj-$(CONFIG_PARPORT_IP32) += parport_ip32.o diff --git a/drivers/parport/parport_ip32.c b/drivers/parport/parport_ip32.c new file mode 100644 index 00000000000..46e06e596d7 --- /dev/null +++ b/drivers/parport/parport_ip32.c @@ -0,0 +1,2253 @@ +/* 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. + * + * 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, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* 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.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 int verbose_probing = DEFAULT_VERBOSE_PROBING; + +/* We do not support more than one port. */ +static struct parport *this_port = NULL; + +/* 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); + printk(" %s", + ecr_modes[(ecr & ECR_MODE_MASK) >> ECR_MODE_SHIFT]); + if (ecr & ECR_nERRINTR) + printk(",nErrIntrEn"); + if (ecr & ECR_DMAEN) + printk(",dmaEn"); + if (ecr & ECR_SERVINTR) + printk(",serviceIntr"); + if (ecr & ECR_F_FULL) + printk(",f_full"); + if (ecr & ECR_F_EMPTY) + printk(",f_empty"); + printk("\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); + printk(" ISA-%s", (cnfgA & CNFGA_IRQ) ? "Level" : "Pulses"); + switch (cnfgA & CNFGA_ID_MASK) { + case CNFGA_ID_8: + printk(",8 bits"); + break; + case CNFGA_ID_16: + printk(",16 bits"); + break; + case CNFGA_ID_32: + printk(",32 bits"); + break; + default: + printk(",unknown ID"); + break; + } + if (!(cnfgA & CNFGA_nBYTEINTRANS)) + printk(",ByteInTrans"); + if ((cnfgA & CNFGA_ID_MASK) != CNFGA_ID_8) + printk(",%d byte%s left", cnfgA & CNFGA_PWORDLEFT, + ((cnfgA & CNFGA_PWORDLEFT) > 1) ? "s" : ""); + printk("\n"); + printk(KERN_DEBUG PPIP32 " cnfgB=0x%02x", cnfgB); + printk(" irq=%u,dma=%u", + (cnfgB & CNFGB_IRQ_MASK) >> CNFGB_IRQ_SHIFT, + (cnfgB & CNFGB_DMA_MASK) >> CNFGB_DMA_SHIFT); + printk(",intrValue=%d", !!(cnfgB & CNFGB_INTRVAL)); + if (cnfgB & CNFGB_COMPRESS) + printk(",compress"); + printk("\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); + printk(" %s", (dcr & DCR_DIR) ? "rev" : "fwd"); + if (dcr & DCR_IRQ) + printk(",ackIntEn"); + if (!(dcr & DCR_SELECT)) + printk(",nSelectIn"); + if (dcr & DCR_nINIT) + printk(",nInit"); + if (!(dcr & DCR_AUTOFD)) + printk(",nAutoFD"); + if (!(dcr & DCR_STROBE)) + printk(",nStrobe"); + printk("\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)) + printk("%cBusy", sep); + if (dsr & DSR_nACK) + printk("%cnAck", sep); + if (dsr & DSR_PERROR) + printk("%cPError", sep); + if (dsr & DSR_SELECT) + printk("%cSelect", sep); + if (dsr & DSR_nFAULT) + printk("%cnFault", sep); + if (!(dsr & DSR_nPRINT)) + printk("%c(Print)", sep); + if (dsr & DSR_TIMEOUT) + printk("%cTimeout", sep); + printk("\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 + * @regs: pointer to &struct pt_regs + */ +static irqreturn_t parport_ip32_dma_interrupt(int irq, void *dev_id, + struct pt_regs *regs) +{ + 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, + struct pt_regs *regs) +{ + pr_trace1(NULL, "(%d)", irq); + return IRQ_HANDLED; +} +#endif + +/** + * parport_ip32_dma_start - begins a DMA transfer + * @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(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(NULL, 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 + * + * Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be + * correctly balanced. + */ +static void parport_ip32_dma_stop(void) +{ + 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(NULL, 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 + * @regs: pointer to &struct pt_regs + * + * 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 pt_regs *regs) +{ + 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: + parport_generic_irq(irq, p, regs); + break; + 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 */ + INIT_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) { + printk(KERN_WARNING 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(DMA_TO_DEVICE, (void *)buf, len); + INIT_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(); + 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) + printk(KERN_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", + 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) + printk(KERN_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 __initdata struct parport_operations parport_ip32_ops = { + .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(®s, &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)) { + printk(KERN_WARNING 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)) { + printk(KERN_WARNING 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()) + printk(KERN_WARNING 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 */ + printk(KERN_INFO "%s: SGI IP32 at 0x%lx (0x%lx)", + p->name, p->base, p->base_hi); + if (p->irq != PARPORT_IRQ_NONE) + printk(", irq %d", p->irq); + printk(" ["); +#define printmode(x) if (p->modes & PARPORT_MODE_##x) \ + printk("%s%s", f++ ? "," : "", #x) + { + unsigned int f = 0; + printmode(PCSPP); + printmode(TRISTATE); + printmode(COMPAT); + printmode(EPP); + printmode(ECP); + printmode(DMA); + } +#undef printmode + printk("]\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"); + pr_debug1(PPIP32 "Compiled on %s, %s\n", __DATE__, __TIME__); + this_port = parport_ip32_probe_port(); + return IS_ERR(this_port) ? PTR_ERR(this_port) : 0; +} + +/** + * 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"); + +/*--- Inform (X)Emacs about preferred coding style ---------------------*/ +/* + * Local Variables: + * mode: c + * c-file-style: "linux" + * indent-tabs-mode: t + * tab-width: 8 + * fill-column: 78 + * ispell-local-dictionary: "american" + * End: + */ |