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linux-headers-5.4.0-215-generic
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parport_pc.h
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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_PARPORT_PC_H #define __LINUX_PARPORT_PC_H #include <asm/io.h> /* --- register definitions ------------------------------- */ #define ECONTROL(p) ((p)->base_hi + 0x2) #define CONFIGB(p) ((p)->base_hi + 0x1) #define CONFIGA(p) ((p)->base_hi + 0x0) #define FIFO(p) ((p)->base_hi + 0x0) #define EPPDATA(p) ((p)->base + 0x4) #define EPPADDR(p) ((p)->base + 0x3) #define CONTROL(p) ((p)->base + 0x2) #define STATUS(p) ((p)->base + 0x1) #define DATA(p) ((p)->base + 0x0) struct parport_pc_private { /* Contents of CTR. */ unsigned char ctr; /* Bitmask of writable CTR bits. */ unsigned char ctr_writable; /* Whether or not there's an ECR. */ int ecr; /* Number of PWords that FIFO will hold. */ int fifo_depth; /* Number of bytes per portword. */ int pword; /* Not used yet. */ int readIntrThreshold; int writeIntrThreshold; /* buffer suitable for DMA, if DMA enabled */ char *dma_buf; dma_addr_t dma_handle; struct list_head list; struct parport *port; }; struct parport_pc_via_data { /* ISA PnP IRQ routing register 1 */ u8 via_pci_parport_irq_reg; /* ISA PnP DMA request routing register */ u8 via_pci_parport_dma_reg; /* Register and value to enable SuperIO configuration access */ u8 via_pci_superio_config_reg; u8 via_pci_superio_config_data; /* SuperIO function register number */ u8 viacfg_function; /* parallel port control register number */ u8 viacfg_parport_control; /* Parallel port base address register */ u8 viacfg_parport_base; }; static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d) { #ifdef DEBUG_PARPORT printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d); #endif outb(d, DATA(p)); } static __inline__ unsigned char parport_pc_read_data(struct parport *p) { unsigned char val = inb (DATA (p)); #ifdef DEBUG_PARPORT printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n", p, val); #endif return val; } #ifdef DEBUG_PARPORT static inline void dump_parport_state (char *str, struct parport *p) { /* here's hoping that reading these ports won't side-effect anything underneath */ unsigned char ecr = inb (ECONTROL (p)); unsigned char dcr = inb (CONTROL (p)); unsigned char dsr = inb (STATUS (p)); static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"}; const struct parport_pc_private *priv = p->physport->private_data; int i; printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]); if (ecr & 0x10) printk (",nErrIntrEn"); if (ecr & 0x08) printk (",dmaEn"); if (ecr & 0x04) printk (",serviceIntr"); if (ecr & 0x02) printk (",f_full"); if (ecr & 0x01) printk (",f_empty"); for (i=0; i<2; i++) { printk ("] dcr(%s)=[", i ? "soft" : "hard"); dcr = i ? priv->ctr : inb (CONTROL (p)); if (dcr & 0x20) { printk ("rev"); } else { printk ("fwd"); } if (dcr & 0x10) printk (",ackIntEn"); if (!(dcr & 0x08)) printk (",N-SELECT-IN"); if (dcr & 0x04) printk (",N-INIT"); if (!(dcr & 0x02)) printk (",N-AUTOFD"); if (!(dcr & 0x01)) printk (",N-STROBE"); } printk ("] dsr=["); if (!(dsr & 0x80)) printk ("BUSY"); if (dsr & 0x40) printk (",N-ACK"); if (dsr & 0x20) printk (",PERROR"); if (dsr & 0x10) printk (",SELECT"); if (dsr & 0x08) printk (",N-FAULT"); printk ("]\n"); return; } #else /* !DEBUG_PARPORT */ #define dump_parport_state(args...) #endif /* !DEBUG_PARPORT */ /* __parport_pc_frob_control differs from parport_pc_frob_control in that * it doesn't do any extra masking. */ static __inline__ unsigned char __parport_pc_frob_control (struct parport *p, unsigned char mask, unsigned char val) { struct parport_pc_private *priv = p->physport->private_data; unsigned char ctr = priv->ctr; #ifdef DEBUG_PARPORT printk (KERN_DEBUG "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n", mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); #endif ctr = (ctr & ~mask) ^ val; ctr &= priv->ctr_writable; /* only write writable bits. */ outb (ctr, CONTROL (p)); priv->ctr = ctr; /* Update soft copy */ return ctr; } static __inline__ void parport_pc_data_reverse (struct parport *p) { __parport_pc_frob_control (p, 0x20, 0x20); } static __inline__ void parport_pc_data_forward (struct parport *p) { __parport_pc_frob_control (p, 0x20, 0x00); } static __inline__ void parport_pc_write_control (struct parport *p, unsigned char d) { const unsigned char wm = (PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_INIT | PARPORT_CONTROL_SELECT); /* Take this out when drivers have adapted to newer interface. */ if (d & 0x20) { printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n", p->name, p->cad->name); parport_pc_data_reverse (p); } __parport_pc_frob_control (p, wm, d & wm); } static __inline__ unsigned char parport_pc_read_control(struct parport *p) { const unsigned char rm = (PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_INIT | PARPORT_CONTROL_SELECT); const struct parport_pc_private *priv = p->physport->private_data; return priv->ctr & rm; /* Use soft copy */ } static __inline__ unsigned char parport_pc_frob_control (struct parport *p, unsigned char mask, unsigned char val) { const unsigned char wm = (PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_INIT | PARPORT_CONTROL_SELECT); /* Take this out when drivers have adapted to newer interface. */ if (mask & 0x20) { printk (KERN_DEBUG "%s (%s): use data_%s for this!\n", p->name, p->cad->name, (val & 0x20) ? "reverse" : "forward"); if (val & 0x20) parport_pc_data_reverse (p); else parport_pc_data_forward (p); } /* Restrict mask and val to control lines. */ mask &= wm; val &= wm; return __parport_pc_frob_control (p, mask, val); } static __inline__ unsigned char parport_pc_read_status(struct parport *p) { return inb(STATUS(p)); } static __inline__ void parport_pc_disable_irq(struct parport *p) { __parport_pc_frob_control (p, 0x10, 0x00); } static __inline__ void parport_pc_enable_irq(struct parport *p) { __parport_pc_frob_control (p, 0x10, 0x10); } extern void parport_pc_release_resources(struct parport *p); extern int parport_pc_claim_resources(struct parport *p); /* PCMCIA code will want to get us to look at a port. Provide a mechanism. */ extern struct parport *parport_pc_probe_port(unsigned long base, unsigned long base_hi, int irq, int dma, struct device *dev, int irqflags); extern void parport_pc_unregister_port(struct parport *p); #endif