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207 lines
5.4 KiB
207 lines
5.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Low-level parallel-support for PC-style hardware integrated in the |
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* LASI-Controller (on GSC-Bus) for HP-PARISC Workstations |
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* |
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* (C) 1999-2001 by Helge Deller <[email protected]> |
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* |
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* based on parport_pc.c by |
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* Grant Guenther <[email protected]> |
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* Phil Blundell <[email protected]> |
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* Tim Waugh <[email protected]> |
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* Jose Renau <[email protected]> |
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* David Campbell |
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* Andrea Arcangeli |
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*/ |
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#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H |
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#define __DRIVERS_PARPORT_PARPORT_GSC_H |
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#include <asm/io.h> |
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#include <linux/delay.h> |
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#undef DEBUG_PARPORT /* undefine for production */ |
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#define DELAY_TIME 0 |
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#if DELAY_TIME == 0 |
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#define parport_readb gsc_readb |
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#define parport_writeb gsc_writeb |
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#else |
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static __inline__ unsigned char parport_readb( unsigned long port ) |
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{ |
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udelay(DELAY_TIME); |
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return gsc_readb(port); |
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} |
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static __inline__ void parport_writeb( unsigned char value, unsigned long port ) |
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{ |
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gsc_writeb(value,port); |
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udelay(DELAY_TIME); |
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} |
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#endif |
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/* --- register definitions ------------------------------- */ |
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#define EPPDATA(p) ((p)->base + 0x4) |
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#define EPPADDR(p) ((p)->base + 0x3) |
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#define CONTROL(p) ((p)->base + 0x2) |
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#define STATUS(p) ((p)->base + 0x1) |
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#define DATA(p) ((p)->base + 0x0) |
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struct parport_gsc_private { |
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/* Contents of CTR. */ |
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unsigned char ctr; |
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/* Bitmask of writable CTR bits. */ |
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unsigned char ctr_writable; |
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/* Number of bytes per portword. */ |
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int pword; |
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/* Not used yet. */ |
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int readIntrThreshold; |
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int writeIntrThreshold; |
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/* buffer suitable for DMA, if DMA enabled */ |
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char *dma_buf; |
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dma_addr_t dma_handle; |
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struct pci_dev *dev; |
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}; |
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static inline void parport_gsc_write_data(struct parport *p, unsigned char d) |
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{ |
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#ifdef DEBUG_PARPORT |
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printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d); |
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#endif |
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parport_writeb(d, DATA(p)); |
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} |
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static inline unsigned char parport_gsc_read_data(struct parport *p) |
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{ |
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unsigned char val = parport_readb (DATA (p)); |
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#ifdef DEBUG_PARPORT |
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printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val); |
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#endif |
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return val; |
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} |
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/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that |
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* it doesn't do any extra masking. */ |
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static inline unsigned char __parport_gsc_frob_control(struct parport *p, |
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unsigned char mask, |
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unsigned char val) |
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{ |
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struct parport_gsc_private *priv = p->physport->private_data; |
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unsigned char ctr = priv->ctr; |
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#ifdef DEBUG_PARPORT |
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printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n", |
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__func__, mask, val, |
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ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); |
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#endif |
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ctr = (ctr & ~mask) ^ val; |
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ctr &= priv->ctr_writable; /* only write writable bits. */ |
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parport_writeb (ctr, CONTROL (p)); |
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priv->ctr = ctr; /* Update soft copy */ |
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return ctr; |
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} |
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static inline void parport_gsc_data_reverse(struct parport *p) |
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{ |
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__parport_gsc_frob_control (p, 0x20, 0x20); |
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} |
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static inline void parport_gsc_data_forward(struct parport *p) |
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{ |
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__parport_gsc_frob_control (p, 0x20, 0x00); |
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} |
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static inline void parport_gsc_write_control(struct parport *p, |
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unsigned char d) |
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{ |
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const unsigned char wm = (PARPORT_CONTROL_STROBE | |
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PARPORT_CONTROL_AUTOFD | |
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PARPORT_CONTROL_INIT | |
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PARPORT_CONTROL_SELECT); |
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/* Take this out when drivers have adapted to newer interface. */ |
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if (d & 0x20) { |
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printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n", |
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p->name, p->cad->name); |
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parport_gsc_data_reverse (p); |
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} |
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__parport_gsc_frob_control (p, wm, d & wm); |
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} |
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static inline unsigned char parport_gsc_read_control(struct parport *p) |
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{ |
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const unsigned char rm = (PARPORT_CONTROL_STROBE | |
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PARPORT_CONTROL_AUTOFD | |
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PARPORT_CONTROL_INIT | |
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PARPORT_CONTROL_SELECT); |
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const struct parport_gsc_private *priv = p->physport->private_data; |
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return priv->ctr & rm; /* Use soft copy */ |
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} |
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static inline unsigned char parport_gsc_frob_control(struct parport *p, |
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unsigned char mask, |
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unsigned char val) |
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{ |
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const unsigned char wm = (PARPORT_CONTROL_STROBE | |
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PARPORT_CONTROL_AUTOFD | |
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PARPORT_CONTROL_INIT | |
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PARPORT_CONTROL_SELECT); |
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/* Take this out when drivers have adapted to newer interface. */ |
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if (mask & 0x20) { |
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printk(KERN_DEBUG "%s (%s): use data_%s for this!\n", |
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p->name, p->cad->name, |
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(val & 0x20) ? "reverse" : "forward"); |
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if (val & 0x20) |
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parport_gsc_data_reverse (p); |
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else |
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parport_gsc_data_forward (p); |
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} |
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/* Restrict mask and val to control lines. */ |
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mask &= wm; |
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val &= wm; |
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return __parport_gsc_frob_control (p, mask, val); |
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} |
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static inline unsigned char parport_gsc_read_status(struct parport *p) |
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{ |
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return parport_readb (STATUS(p)); |
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} |
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static inline void parport_gsc_disable_irq(struct parport *p) |
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{ |
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__parport_gsc_frob_control (p, 0x10, 0x00); |
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} |
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static inline void parport_gsc_enable_irq(struct parport *p) |
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{ |
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__parport_gsc_frob_control (p, 0x10, 0x10); |
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} |
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extern void parport_gsc_release_resources(struct parport *p); |
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extern int parport_gsc_claim_resources(struct parport *p); |
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extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s); |
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extern void parport_gsc_save_state(struct parport *p, struct parport_state *s); |
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extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s); |
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extern void parport_gsc_inc_use_count(void); |
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extern void parport_gsc_dec_use_count(void); |
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extern struct parport *parport_gsc_probe_port(unsigned long base, |
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unsigned long base_hi, |
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int irq, int dma, |
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struct parisc_device *padev); |
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#endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
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