| /* |
| * drivers/sbus/char/bpp.c |
| * |
| * Copyright (c) 1995 Picture Elements |
| * Stephen Williams (steve@icarus.com) |
| * Gus Baldauf (gbaldauf@ix.netcom.com) |
| * |
| * Linux/SPARC port by Peter Zaitcev. |
| * Integration into SPARC tree by Tom Dyas. |
| */ |
| |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/errno.h> |
| #include <linux/sched.h> |
| #include <linux/spinlock.h> |
| #include <linux/timer.h> |
| #include <linux/ioport.h> |
| #include <linux/major.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/io.h> |
| |
| #if defined(__i386__) |
| # include <asm/system.h> |
| #endif |
| |
| #if defined(__sparc__) |
| # include <linux/init.h> |
| # include <linux/delay.h> /* udelay() */ |
| |
| # include <asm/oplib.h> /* OpenProm Library */ |
| # include <asm/sbus.h> |
| #endif |
| |
| #include <asm/bpp.h> |
| |
| #define BPP_PROBE_CODE 0x55 |
| #define BPP_DELAY 100 |
| |
| static const unsigned BPP_MAJOR = LP_MAJOR; |
| static const char* dev_name = "bpp"; |
| |
| /* When switching from compatibility to a mode where I can read, try |
| the following mode first. */ |
| |
| /* const unsigned char DEFAULT_ECP = 0x10; */ |
| static const unsigned char DEFAULT_ECP = 0x30; |
| static const unsigned char DEFAULT_NIBBLE = 0x00; |
| |
| /* |
| * These are 1284 time constraints, in units of jiffies. |
| */ |
| |
| static const unsigned long TIME_PSetup = 1; |
| static const unsigned long TIME_PResponse = 6; |
| static const unsigned long TIME_IDLE_LIMIT = 2000; |
| |
| /* |
| * One instance per supported subdevice... |
| */ |
| # define BPP_NO 3 |
| |
| enum IEEE_Mode { COMPATIBILITY, NIBBLE, ECP, ECP_RLE, EPP }; |
| |
| struct inst { |
| unsigned present : 1; /* True if the hardware exists */ |
| unsigned enhanced : 1; /* True if the hardware in "enhanced" */ |
| unsigned opened : 1; /* True if the device is opened already */ |
| unsigned run_flag : 1; /* True if waiting for a repeate byte */ |
| |
| unsigned char direction; /* 0 --> out, 0x20 --> IN */ |
| unsigned char pp_state; /* State of host controlled pins. */ |
| enum IEEE_Mode mode; |
| |
| unsigned char run_length; |
| unsigned char repeat_byte; |
| }; |
| |
| static struct inst instances[BPP_NO]; |
| |
| #if defined(__i386__) |
| |
| static const unsigned short base_addrs[BPP_NO] = { 0x278, 0x378, 0x3bc }; |
| |
| /* |
| * These are for data access. |
| * Control lines accesses are hidden in set_bits() and get_bits(). |
| * The exception is the probe procedure, which is system-dependent. |
| */ |
| #define bpp_outb_p(data, base) outb_p((data), (base)) |
| #define bpp_inb(base) inb(base) |
| #define bpp_inb_p(base) inb_p(base) |
| |
| /* |
| * This method takes the pin values mask and sets the hardware pins to |
| * the requested value: 1 == high voltage, 0 == low voltage. This |
| * burries the annoying PC bit inversion and preserves the direction |
| * flag. |
| */ |
| static void set_pins(unsigned short pins, unsigned minor) |
| { |
| unsigned char bits = instances[minor].direction; /* == 0x20 */ |
| |
| if (! (pins & BPP_PP_nStrobe)) bits |= 1; |
| if (! (pins & BPP_PP_nAutoFd)) bits |= 2; |
| if ( pins & BPP_PP_nInit) bits |= 4; |
| if (! (pins & BPP_PP_nSelectIn)) bits |= 8; |
| |
| instances[minor].pp_state = bits; |
| |
| outb_p(bits, base_addrs[minor]+2); |
| } |
| |
| static unsigned short get_pins(unsigned minor) |
| { |
| unsigned short bits = 0; |
| |
| unsigned value = instances[minor].pp_state; |
| if (! (value & 0x01)) bits |= BPP_PP_nStrobe; |
| if (! (value & 0x02)) bits |= BPP_PP_nAutoFd; |
| if (value & 0x04) bits |= BPP_PP_nInit; |
| if (! (value & 0x08)) bits |= BPP_PP_nSelectIn; |
| |
| value = inb_p(base_addrs[minor]+1); |
| if (value & 0x08) bits |= BPP_GP_nFault; |
| if (value & 0x10) bits |= BPP_GP_Select; |
| if (value & 0x20) bits |= BPP_GP_PError; |
| if (value & 0x40) bits |= BPP_GP_nAck; |
| if (! (value & 0x80)) bits |= BPP_GP_Busy; |
| |
| return bits; |
| } |
| |
| #endif /* __i386__ */ |
| |
| #if defined(__sparc__) |
| |
| /* |
| * Register block |
| */ |
| /* DMA registers */ |
| #define BPP_CSR 0x00 |
| #define BPP_ADDR 0x04 |
| #define BPP_BCNT 0x08 |
| #define BPP_TST_CSR 0x0C |
| /* Parallel Port registers */ |
| #define BPP_HCR 0x10 |
| #define BPP_OCR 0x12 |
| #define BPP_DR 0x14 |
| #define BPP_TCR 0x15 |
| #define BPP_OR 0x16 |
| #define BPP_IR 0x17 |
| #define BPP_ICR 0x18 |
| #define BPP_SIZE 0x1A |
| |
| /* BPP_CSR. Bits of type RW1 are cleared with writing '1'. */ |
| #define P_DEV_ID_MASK 0xf0000000 /* R */ |
| #define P_DEV_ID_ZEBRA 0x40000000 |
| #define P_DEV_ID_L64854 0xa0000000 /* == NCR 89C100+89C105. Pity. */ |
| #define P_NA_LOADED 0x08000000 /* R NA wirtten but was not used */ |
| #define P_A_LOADED 0x04000000 /* R */ |
| #define P_DMA_ON 0x02000000 /* R DMA is not disabled */ |
| #define P_EN_NEXT 0x01000000 /* RW */ |
| #define P_TCI_DIS 0x00800000 /* RW TCI forbidden from interrupts */ |
| #define P_DIAG 0x00100000 /* RW Disables draining and resetting |
| of P-FIFO on loading of P_ADDR*/ |
| #define P_BURST_SIZE 0x000c0000 /* RW SBus burst size */ |
| #define P_BURST_8 0x00000000 |
| #define P_BURST_4 0x00040000 |
| #define P_BURST_1 0x00080000 /* "No burst" write */ |
| #define P_TC 0x00004000 /* RW1 Term Count, can be cleared when |
| P_EN_NEXT=1 */ |
| #define P_EN_CNT 0x00002000 /* RW */ |
| #define P_EN_DMA 0x00000200 /* RW */ |
| #define P_WRITE 0x00000100 /* R DMA dir, 1=to ram, 0=to port */ |
| #define P_RESET 0x00000080 /* RW */ |
| #define P_SLAVE_ERR 0x00000040 /* RW1 Access size error */ |
| #define P_INVALIDATE 0x00000020 /* W Drop P-FIFO */ |
| #define P_INT_EN 0x00000010 /* RW OK to P_INT_PEND||P_ERR_PEND */ |
| #define P_DRAINING 0x0000000c /* R P-FIFO is draining to memory */ |
| #define P_ERR_PEND 0x00000002 /* R */ |
| #define P_INT_PEND 0x00000001 /* R */ |
| |
| /* BPP_HCR. Time is in increments of SBus clock. */ |
| #define P_HCR_TEST 0x8000 /* Allows buried counters to be read */ |
| #define P_HCR_DSW 0x7f00 /* Data strobe width (in ticks) */ |
| #define P_HCR_DDS 0x007f /* Data setup before strobe (in ticks) */ |
| |
| /* BPP_OCR. */ |
| #define P_OCR_MEM_CLR 0x8000 |
| #define P_OCR_DATA_SRC 0x4000 /* ) */ |
| #define P_OCR_DS_DSEL 0x2000 /* ) Bidirectional */ |
| #define P_OCR_BUSY_DSEL 0x1000 /* ) selects */ |
| #define P_OCR_ACK_DSEL 0x0800 /* ) */ |
| #define P_OCR_EN_DIAG 0x0400 |
| #define P_OCR_BUSY_OP 0x0200 /* Busy operation */ |
| #define P_OCR_ACK_OP 0x0100 /* Ack operation */ |
| #define P_OCR_SRST 0x0080 /* Reset state machines. Not selfcleaning. */ |
| #define P_OCR_IDLE 0x0008 /* PP data transfer state machine is idle */ |
| #define P_OCR_V_ILCK 0x0002 /* Versatec faded. Zebra only. */ |
| #define P_OCR_EN_VER 0x0001 /* Enable Versatec (0 - enable). Zebra only. */ |
| |
| /* BPP_TCR */ |
| #define P_TCR_DIR 0x08 |
| #define P_TCR_BUSY 0x04 |
| #define P_TCR_ACK 0x02 |
| #define P_TCR_DS 0x01 /* Strobe */ |
| |
| /* BPP_OR */ |
| #define P_OR_V3 0x20 /* ) */ |
| #define P_OR_V2 0x10 /* ) on Zebra only */ |
| #define P_OR_V1 0x08 /* ) */ |
| #define P_OR_INIT 0x04 |
| #define P_OR_AFXN 0x02 /* Auto Feed */ |
| #define P_OR_SLCT_IN 0x01 |
| |
| /* BPP_IR */ |
| #define P_IR_PE 0x04 |
| #define P_IR_SLCT 0x02 |
| #define P_IR_ERR 0x01 |
| |
| /* BPP_ICR */ |
| #define P_DS_IRQ 0x8000 /* RW1 */ |
| #define P_ACK_IRQ 0x4000 /* RW1 */ |
| #define P_BUSY_IRQ 0x2000 /* RW1 */ |
| #define P_PE_IRQ 0x1000 /* RW1 */ |
| #define P_SLCT_IRQ 0x0800 /* RW1 */ |
| #define P_ERR_IRQ 0x0400 /* RW1 */ |
| #define P_DS_IRQ_EN 0x0200 /* RW Always on rising edge */ |
| #define P_ACK_IRQ_EN 0x0100 /* RW Always on rising edge */ |
| #define P_BUSY_IRP 0x0080 /* RW 1= rising edge */ |
| #define P_BUSY_IRQ_EN 0x0040 /* RW */ |
| #define P_PE_IRP 0x0020 /* RW 1= rising edge */ |
| #define P_PE_IRQ_EN 0x0010 /* RW */ |
| #define P_SLCT_IRP 0x0008 /* RW 1= rising edge */ |
| #define P_SLCT_IRQ_EN 0x0004 /* RW */ |
| #define P_ERR_IRP 0x0002 /* RW1 1= rising edge */ |
| #define P_ERR_IRQ_EN 0x0001 /* RW */ |
| |
| static void __iomem *base_addrs[BPP_NO]; |
| |
| #define bpp_outb_p(data, base) sbus_writeb(data, (base) + BPP_DR) |
| #define bpp_inb_p(base) sbus_readb((base) + BPP_DR) |
| #define bpp_inb(base) sbus_readb((base) + BPP_DR) |
| |
| static void set_pins(unsigned short pins, unsigned minor) |
| { |
| void __iomem *base = base_addrs[minor]; |
| unsigned char bits_tcr = 0, bits_or = 0; |
| |
| if (instances[minor].direction & 0x20) bits_tcr |= P_TCR_DIR; |
| if ( pins & BPP_PP_nStrobe) bits_tcr |= P_TCR_DS; |
| |
| if ( pins & BPP_PP_nAutoFd) bits_or |= P_OR_AFXN; |
| if (! (pins & BPP_PP_nInit)) bits_or |= P_OR_INIT; |
| if (! (pins & BPP_PP_nSelectIn)) bits_or |= P_OR_SLCT_IN; |
| |
| sbus_writeb(bits_or, base + BPP_OR); |
| sbus_writeb(bits_tcr, base + BPP_TCR); |
| } |
| |
| /* |
| * i386 people read output pins from a software image. |
| * We may get them back from hardware. |
| * Again, inversion of pins must he buried here. |
| */ |
| static unsigned short get_pins(unsigned minor) |
| { |
| void __iomem *base = base_addrs[minor]; |
| unsigned short bits = 0; |
| unsigned value_tcr = sbus_readb(base + BPP_TCR); |
| unsigned value_ir = sbus_readb(base + BPP_IR); |
| unsigned value_or = sbus_readb(base + BPP_OR); |
| |
| if (value_tcr & P_TCR_DS) bits |= BPP_PP_nStrobe; |
| if (value_or & P_OR_AFXN) bits |= BPP_PP_nAutoFd; |
| if (! (value_or & P_OR_INIT)) bits |= BPP_PP_nInit; |
| if (! (value_or & P_OR_SLCT_IN)) bits |= BPP_PP_nSelectIn; |
| |
| if (value_ir & P_IR_ERR) bits |= BPP_GP_nFault; |
| if (! (value_ir & P_IR_SLCT)) bits |= BPP_GP_Select; |
| if (! (value_ir & P_IR_PE)) bits |= BPP_GP_PError; |
| if (! (value_tcr & P_TCR_ACK)) bits |= BPP_GP_nAck; |
| if (value_tcr & P_TCR_BUSY) bits |= BPP_GP_Busy; |
| |
| return bits; |
| } |
| |
| #endif /* __sparc__ */ |
| |
| static void snooze(unsigned long snooze_time, unsigned minor) |
| { |
| schedule_timeout_uninterruptible(snooze_time + 1); |
| } |
| |
| static int wait_for(unsigned short set, unsigned short clr, |
| unsigned long delay, unsigned minor) |
| { |
| unsigned short pins = get_pins(minor); |
| |
| unsigned long extime = 0; |
| |
| /* |
| * Try a real fast scan for the first jiffy, in case the device |
| * responds real good. The first while loop guesses an expire |
| * time accounting for possible wraparound of jiffies. |
| */ |
| while (time_after_eq(jiffies, extime)) extime = jiffies + 1; |
| while ( (time_before(jiffies, extime)) |
| && (((pins & set) != set) || ((pins & clr) != 0)) ) { |
| pins = get_pins(minor); |
| } |
| |
| delay -= 1; |
| |
| /* |
| * If my delay expired or the pins are still not where I want |
| * them, then resort to using the timer and greatly reduce my |
| * sample rate. If the peripheral is going to be slow, this will |
| * give the CPU up to some more worthy process. |
| */ |
| while ( delay && (((pins & set) != set) || ((pins & clr) != 0)) ) { |
| |
| snooze(1, minor); |
| pins = get_pins(minor); |
| delay -= 1; |
| } |
| |
| if (delay == 0) return -1; |
| else return pins; |
| } |
| |
| /* |
| * Return ZERO(0) If the negotiation succeeds, an errno otherwise. An |
| * errno means something broke, and I do not yet know how to fix it. |
| */ |
| static int negotiate(unsigned char mode, unsigned minor) |
| { |
| int rc; |
| unsigned short pins = get_pins(minor); |
| if (pins & BPP_PP_nSelectIn) return -EIO; |
| |
| |
| /* Event 0: Write the mode to the data lines */ |
| bpp_outb_p(mode, base_addrs[minor]); |
| |
| snooze(TIME_PSetup, minor); |
| |
| /* Event 1: Strobe the mode code into the peripheral */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| |
| /* Wait for Event 2: Peripheral responds as a 1284 device. */ |
| rc = wait_for(BPP_GP_PError|BPP_GP_Select|BPP_GP_nFault, |
| BPP_GP_nAck, |
| TIME_PResponse, |
| minor); |
| |
| if (rc == -1) return -ETIMEDOUT; |
| |
| /* Event 3: latch extensibility request */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nInit, minor); |
| |
| /* ... quick nap while peripheral ponders the byte i'm sending...*/ |
| snooze(1, minor); |
| |
| /* Event 4: restore strobe, to ACK peripheral's response. */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| |
| /* Wait for Event 6: Peripheral latches response bits */ |
| rc = wait_for(BPP_GP_nAck, 0, TIME_PSetup+TIME_PResponse, minor); |
| if (rc == -1) return -EIO; |
| |
| /* A 1284 device cannot refuse nibble mode */ |
| if (mode == DEFAULT_NIBBLE) return 0; |
| |
| if (pins & BPP_GP_Select) return 0; |
| |
| return -EPROTONOSUPPORT; |
| } |
| |
| static int terminate(unsigned minor) |
| { |
| int rc; |
| |
| /* Event 22: Request termination of 1284 mode */ |
| set_pins(BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| |
| /* Wait for Events 23 and 24: ACK termination request. */ |
| rc = wait_for(BPP_GP_Busy|BPP_GP_nFault, |
| BPP_GP_nAck, |
| TIME_PSetup+TIME_PResponse, |
| minor); |
| |
| instances[minor].direction = 0; |
| instances[minor].mode = COMPATIBILITY; |
| |
| if (rc == -1) { |
| return -EIO; |
| } |
| |
| /* Event 25: Handshake by lowering nAutoFd */ |
| set_pins(BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| |
| /* Event 26: Peripheral wiggles lines... */ |
| |
| /* Event 27: Peripheral sets nAck HIGH to ack handshake */ |
| rc = wait_for(BPP_GP_nAck, 0, TIME_PResponse, minor); |
| if (rc == -1) { |
| set_pins(BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| return -EIO; |
| } |
| |
| /* Event 28: Finish phase by raising nAutoFd */ |
| set_pins(BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, minor); |
| |
| return 0; |
| } |
| |
| static DEFINE_SPINLOCK(bpp_open_lock); |
| |
| /* |
| * Allow only one process to open the device at a time. |
| */ |
| static int bpp_open(struct inode *inode, struct file *f) |
| { |
| unsigned minor = iminor(inode); |
| int ret; |
| |
| spin_lock(&bpp_open_lock); |
| ret = 0; |
| if (minor >= BPP_NO) { |
| ret = -ENODEV; |
| } else { |
| if (! instances[minor].present) { |
| ret = -ENODEV; |
| } else { |
| if (instances[minor].opened) |
| ret = -EBUSY; |
| else |
| instances[minor].opened = 1; |
| } |
| } |
| spin_unlock(&bpp_open_lock); |
| |
| return ret; |
| } |
| |
| /* |
| * When the process closes the device, this method is called to clean |
| * up and reset the hardware. Always leave the device in compatibility |
| * mode as this is a reasonable place to clean up from messes made by |
| * ioctls, or other mayhem. |
| */ |
| static int bpp_release(struct inode *inode, struct file *f) |
| { |
| unsigned minor = iminor(inode); |
| |
| spin_lock(&bpp_open_lock); |
| instances[minor].opened = 0; |
| |
| if (instances[minor].mode != COMPATIBILITY) |
| terminate(minor); |
| |
| spin_unlock(&bpp_open_lock); |
| |
| return 0; |
| } |
| |
| static long read_nibble(unsigned minor, char __user *c, unsigned long cnt) |
| { |
| unsigned long remaining = cnt; |
| long rc; |
| |
| while (remaining > 0) { |
| unsigned char byte = 0; |
| int pins; |
| |
| /* Event 7: request nibble */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nStrobe, minor); |
| |
| /* Wait for event 9: Peripher strobes first nibble */ |
| pins = wait_for(0, BPP_GP_nAck, TIME_IDLE_LIMIT, minor); |
| if (pins == -1) return -ETIMEDOUT; |
| |
| /* Event 10: I handshake nibble */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nStrobe|BPP_PP_nAutoFd, minor); |
| if (pins & BPP_GP_nFault) byte |= 0x01; |
| if (pins & BPP_GP_Select) byte |= 0x02; |
| if (pins & BPP_GP_PError) byte |= 0x04; |
| if (pins & BPP_GP_Busy) byte |= 0x08; |
| |
| /* Wait for event 11: Peripheral handshakes nibble */ |
| rc = wait_for(BPP_GP_nAck, 0, TIME_PResponse, minor); |
| |
| /* Event 7: request nibble */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nStrobe, minor); |
| |
| /* Wait for event 9: Peripher strobes first nibble */ |
| pins = wait_for(0, BPP_GP_nAck, TIME_PResponse, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| |
| /* Event 10: I handshake nibble */ |
| set_pins(BPP_PP_nSelectIn|BPP_PP_nStrobe|BPP_PP_nAutoFd, minor); |
| if (pins & BPP_GP_nFault) byte |= 0x10; |
| if (pins & BPP_GP_Select) byte |= 0x20; |
| if (pins & BPP_GP_PError) byte |= 0x40; |
| if (pins & BPP_GP_Busy) byte |= 0x80; |
| |
| if (put_user(byte, c)) |
| return -EFAULT; |
| c += 1; |
| remaining -= 1; |
| |
| /* Wait for event 11: Peripheral handshakes nibble */ |
| rc = wait_for(BPP_GP_nAck, 0, TIME_PResponse, minor); |
| if (rc == -1) return -EIO; |
| } |
| |
| return cnt - remaining; |
| } |
| |
| static long read_ecp(unsigned minor, char __user *c, unsigned long cnt) |
| { |
| unsigned long remaining; |
| long rc; |
| |
| /* Turn ECP mode from forward to reverse if needed. */ |
| if (! instances[minor].direction) { |
| unsigned short pins = get_pins(minor); |
| |
| /* Event 38: Turn the bus around */ |
| instances[minor].direction = 0x20; |
| pins &= ~BPP_PP_nAutoFd; |
| set_pins(pins, minor); |
| |
| /* Event 39: Set pins for reverse mode. */ |
| snooze(TIME_PSetup, minor); |
| set_pins(BPP_PP_nStrobe|BPP_PP_nSelectIn, minor); |
| |
| /* Wait for event 40: Peripheral ready to be strobed */ |
| rc = wait_for(0, BPP_GP_PError, TIME_PResponse, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| } |
| |
| remaining = cnt; |
| |
| while (remaining > 0) { |
| |
| /* If there is a run length for a repeated byte, repeat */ |
| /* that byte a few times. */ |
| if (instances[minor].run_length && !instances[minor].run_flag) { |
| |
| char buffer[128]; |
| unsigned idx; |
| unsigned repeat = remaining < instances[minor].run_length |
| ? remaining |
| : instances[minor].run_length; |
| |
| for (idx = 0 ; idx < repeat ; idx += 1) |
| buffer[idx] = instances[minor].repeat_byte; |
| |
| if (copy_to_user(c, buffer, repeat)) |
| return -EFAULT; |
| remaining -= repeat; |
| c += repeat; |
| instances[minor].run_length -= repeat; |
| } |
| |
| if (remaining == 0) break; |
| |
| |
| /* Wait for Event 43: Data active on the bus. */ |
| rc = wait_for(0, BPP_GP_nAck, TIME_IDLE_LIMIT, minor); |
| if (rc == -1) break; |
| |
| if (rc & BPP_GP_Busy) { |
| /* OK, this is data. read it in. */ |
| unsigned char byte = bpp_inb(base_addrs[minor]); |
| if (put_user(byte, c)) |
| return -EFAULT; |
| c += 1; |
| remaining -= 1; |
| |
| if (instances[minor].run_flag) { |
| instances[minor].repeat_byte = byte; |
| instances[minor].run_flag = 0; |
| } |
| |
| } else { |
| unsigned char byte = bpp_inb(base_addrs[minor]); |
| if (byte & 0x80) { |
| printk("bpp%d: " |
| "Ignoring ECP channel %u from device.\n", |
| minor, byte & 0x7f); |
| } else { |
| instances[minor].run_length = byte; |
| instances[minor].run_flag = 1; |
| } |
| } |
| |
| /* Event 44: I got it. */ |
| set_pins(BPP_PP_nStrobe|BPP_PP_nAutoFd|BPP_PP_nSelectIn, minor); |
| |
| /* Wait for event 45: peripheral handshake */ |
| rc = wait_for(BPP_GP_nAck, 0, TIME_PResponse, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| |
| /* Event 46: Finish handshake */ |
| set_pins(BPP_PP_nStrobe|BPP_PP_nSelectIn, minor); |
| |
| } |
| |
| |
| return cnt - remaining; |
| } |
| |
| static ssize_t bpp_read(struct file *f, char __user *c, size_t cnt, loff_t * ppos) |
| { |
| long rc; |
| unsigned minor = iminor(f->f_path.dentry->d_inode); |
| if (minor >= BPP_NO) return -ENODEV; |
| if (!instances[minor].present) return -ENODEV; |
| |
| switch (instances[minor].mode) { |
| |
| default: |
| if (instances[minor].mode != COMPATIBILITY) |
| terminate(minor); |
| |
| if (instances[minor].enhanced) { |
| /* For now, do all reads with ECP-RLE mode */ |
| unsigned short pins; |
| |
| rc = negotiate(DEFAULT_ECP, minor); |
| if (rc < 0) break; |
| |
| instances[minor].mode = ECP_RLE; |
| |
| /* Event 30: set nAutoFd low to setup for ECP mode */ |
| pins = get_pins(minor); |
| pins &= ~BPP_PP_nAutoFd; |
| set_pins(pins, minor); |
| |
| /* Wait for Event 31: peripheral ready */ |
| rc = wait_for(BPP_GP_PError, 0, TIME_PResponse, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| |
| rc = read_ecp(minor, c, cnt); |
| |
| } else { |
| rc = negotiate(DEFAULT_NIBBLE, minor); |
| if (rc < 0) break; |
| |
| instances[minor].mode = NIBBLE; |
| |
| rc = read_nibble(minor, c, cnt); |
| } |
| break; |
| |
| case NIBBLE: |
| rc = read_nibble(minor, c, cnt); |
| break; |
| |
| case ECP: |
| case ECP_RLE: |
| rc = read_ecp(minor, c, cnt); |
| break; |
| |
| } |
| |
| |
| return rc; |
| } |
| |
| /* |
| * Compatibility mode handshaking is a matter of writing data, |
| * strobing it, and waiting for the printer to stop being busy. |
| */ |
| static long write_compat(unsigned minor, const char __user *c, unsigned long cnt) |
| { |
| long rc; |
| unsigned short pins = get_pins(minor); |
| |
| unsigned long remaining = cnt; |
| |
| |
| while (remaining > 0) { |
| unsigned char byte; |
| |
| if (get_user(byte, c)) |
| return -EFAULT; |
| c += 1; |
| |
| rc = wait_for(BPP_GP_nAck, BPP_GP_Busy, TIME_IDLE_LIMIT, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| |
| bpp_outb_p(byte, base_addrs[minor]); |
| remaining -= 1; |
| /* snooze(1, minor); */ |
| |
| pins &= ~BPP_PP_nStrobe; |
| set_pins(pins, minor); |
| |
| rc = wait_for(BPP_GP_Busy, 0, TIME_PResponse, minor); |
| |
| pins |= BPP_PP_nStrobe; |
| set_pins(pins, minor); |
| } |
| |
| return cnt - remaining; |
| } |
| |
| /* |
| * Write data using ECP mode. Watch out that the port may be set up |
| * for reading. If so, turn the port around. |
| */ |
| static long write_ecp(unsigned minor, const char __user *c, unsigned long cnt) |
| { |
| unsigned short pins = get_pins(minor); |
| unsigned long remaining = cnt; |
| |
| if (instances[minor].direction) { |
| int rc; |
| |
| /* Event 47 Request bus be turned around */ |
| pins |= BPP_PP_nInit; |
| set_pins(pins, minor); |
| |
| /* Wait for Event 49: Peripheral relinquished bus */ |
| rc = wait_for(BPP_GP_PError, 0, TIME_PResponse, minor); |
| |
| pins |= BPP_PP_nAutoFd; |
| instances[minor].direction = 0; |
| set_pins(pins, minor); |
| } |
| |
| while (remaining > 0) { |
| unsigned char byte; |
| int rc; |
| |
| if (get_user(byte, c)) |
| return -EFAULT; |
| |
| rc = wait_for(0, BPP_GP_Busy, TIME_PResponse, minor); |
| if (rc == -1) return -ETIMEDOUT; |
| |
| c += 1; |
| |
| bpp_outb_p(byte, base_addrs[minor]); |
| |
| pins &= ~BPP_PP_nStrobe; |
| set_pins(pins, minor); |
| |
| pins |= BPP_PP_nStrobe; |
| rc = wait_for(BPP_GP_Busy, 0, TIME_PResponse, minor); |
| if (rc == -1) return -EIO; |
| |
| set_pins(pins, minor); |
| } |
| |
| return cnt - remaining; |
| } |
| |
| /* |
| * Write to the peripheral. Be sensitive of the current mode. If I'm |
| * in a mode that can be turned around (ECP) then just do |
| * that. Otherwise, terminate and do my writing in compat mode. This |
| * is the safest course as any device can handle it. |
| */ |
| static ssize_t bpp_write(struct file *f, const char __user *c, size_t cnt, loff_t * ppos) |
| { |
| long errno = 0; |
| unsigned minor = iminor(f->f_path.dentry->d_inode); |
| if (minor >= BPP_NO) return -ENODEV; |
| if (!instances[minor].present) return -ENODEV; |
| |
| switch (instances[minor].mode) { |
| |
| case ECP: |
| case ECP_RLE: |
| errno = write_ecp(minor, c, cnt); |
| break; |
| case COMPATIBILITY: |
| errno = write_compat(minor, c, cnt); |
| break; |
| default: |
| terminate(minor); |
| errno = write_compat(minor, c, cnt); |
| } |
| |
| return errno; |
| } |
| |
| static int bpp_ioctl(struct inode *inode, struct file *f, unsigned int cmd, |
| unsigned long arg) |
| { |
| int errno = 0; |
| |
| unsigned minor = iminor(inode); |
| if (minor >= BPP_NO) return -ENODEV; |
| if (!instances[minor].present) return -ENODEV; |
| |
| |
| switch (cmd) { |
| |
| case BPP_PUT_PINS: |
| set_pins(arg, minor); |
| break; |
| |
| case BPP_GET_PINS: |
| errno = get_pins(minor); |
| break; |
| |
| case BPP_PUT_DATA: |
| bpp_outb_p(arg, base_addrs[minor]); |
| break; |
| |
| case BPP_GET_DATA: |
| errno = bpp_inb_p(base_addrs[minor]); |
| break; |
| |
| case BPP_SET_INPUT: |
| if (arg) |
| if (instances[minor].enhanced) { |
| unsigned short bits = get_pins(minor); |
| instances[minor].direction = 0x20; |
| set_pins(bits, minor); |
| } else { |
| errno = -ENOTTY; |
| } |
| else { |
| unsigned short bits = get_pins(minor); |
| instances[minor].direction = 0x00; |
| set_pins(bits, minor); |
| } |
| break; |
| |
| default: |
| errno = -EINVAL; |
| } |
| |
| return errno; |
| } |
| |
| static const struct file_operations bpp_fops = { |
| .owner = THIS_MODULE, |
| .read = bpp_read, |
| .write = bpp_write, |
| .ioctl = bpp_ioctl, |
| .open = bpp_open, |
| .release = bpp_release, |
| }; |
| |
| #if defined(__i386__) |
| |
| #define collectLptPorts() {} |
| |
| static void probeLptPort(unsigned idx) |
| { |
| unsigned int testvalue; |
| const unsigned short lpAddr = base_addrs[idx]; |
| |
| instances[idx].present = 0; |
| instances[idx].enhanced = 0; |
| instances[idx].direction = 0; |
| instances[idx].mode = COMPATIBILITY; |
| instances[idx].run_length = 0; |
| instances[idx].run_flag = 0; |
| if (!request_region(lpAddr,3, dev_name)) return; |
| |
| /* |
| * First, make sure the instance exists. Do this by writing to |
| * the data latch and reading the value back. If the port *is* |
| * present, test to see if it supports extended-mode |
| * operation. This will be required for IEEE1284 reverse |
| * transfers. |
| */ |
| |
| outb_p(BPP_PROBE_CODE, lpAddr); |
| for (testvalue=0; testvalue<BPP_DELAY; testvalue++) |
| ; |
| testvalue = inb_p(lpAddr); |
| if (testvalue == BPP_PROBE_CODE) { |
| unsigned save; |
| instances[idx].present = 1; |
| |
| save = inb_p(lpAddr+2); |
| for (testvalue=0; testvalue<BPP_DELAY; testvalue++) |
| ; |
| outb_p(save|0x20, lpAddr+2); |
| for (testvalue=0; testvalue<BPP_DELAY; testvalue++) |
| ; |
| outb_p(~BPP_PROBE_CODE, lpAddr); |
| for (testvalue=0; testvalue<BPP_DELAY; testvalue++) |
| ; |
| testvalue = inb_p(lpAddr); |
| if ((testvalue&0xff) == (0xff&~BPP_PROBE_CODE)) |
| instances[idx].enhanced = 0; |
| else |
| instances[idx].enhanced = 1; |
| outb_p(save, lpAddr+2); |
| } |
| else { |
| release_region(lpAddr,3); |
| } |
| /* |
| * Leave the port in compat idle mode. |
| */ |
| set_pins(BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, idx); |
| |
| printk("bpp%d: Port at 0x%03x: Enhanced mode %s\n", idx, base_addrs[idx], |
| instances[idx].enhanced? "SUPPORTED" : "UNAVAILABLE"); |
| } |
| |
| static inline void freeLptPort(int idx) |
| { |
| release_region(base_addrs[idx], 3); |
| } |
| |
| #endif |
| |
| #if defined(__sparc__) |
| |
| static void __iomem *map_bpp(struct sbus_dev *dev, int idx) |
| { |
| return sbus_ioremap(&dev->resource[0], 0, BPP_SIZE, "bpp"); |
| } |
| |
| static int collectLptPorts(void) |
| { |
| struct sbus_bus *bus; |
| struct sbus_dev *dev; |
| int count; |
| |
| count = 0; |
| for_all_sbusdev(dev, bus) { |
| if (strcmp(dev->prom_name, "SUNW,bpp") == 0) { |
| if (count >= BPP_NO) { |
| printk(KERN_NOTICE |
| "bpp: More than %d bpp ports," |
| " rest is ignored\n", BPP_NO); |
| return count; |
| } |
| base_addrs[count] = map_bpp(dev, count); |
| count++; |
| } |
| } |
| return count; |
| } |
| |
| static void probeLptPort(unsigned idx) |
| { |
| void __iomem *rp = base_addrs[idx]; |
| __u32 csr; |
| char *brand; |
| |
| instances[idx].present = 0; |
| instances[idx].enhanced = 0; |
| instances[idx].direction = 0; |
| instances[idx].mode = COMPATIBILITY; |
| instances[idx].run_length = 0; |
| instances[idx].run_flag = 0; |
| |
| if (!rp) return; |
| |
| instances[idx].present = 1; |
| instances[idx].enhanced = 1; /* Sure */ |
| |
| csr = sbus_readl(rp + BPP_CSR); |
| if ((csr & P_DRAINING) != 0 && (csr & P_ERR_PEND) == 0) { |
| udelay(20); |
| csr = sbus_readl(rp + BPP_CSR); |
| if ((csr & P_DRAINING) != 0 && (csr & P_ERR_PEND) == 0) { |
| printk("bpp%d: DRAINING still active (0x%08x)\n", idx, csr); |
| } |
| } |
| printk("bpp%d: reset with 0x%08x ..", idx, csr); |
| sbus_writel((csr | P_RESET) & ~P_INT_EN, rp + BPP_CSR); |
| udelay(500); |
| sbus_writel(sbus_readl(rp + BPP_CSR) & ~P_RESET, rp + BPP_CSR); |
| csr = sbus_readl(rp + BPP_CSR); |
| printk(" done with csr=0x%08x ocr=0x%04x\n", |
| csr, sbus_readw(rp + BPP_OCR)); |
| |
| switch (csr & P_DEV_ID_MASK) { |
| case P_DEV_ID_ZEBRA: |
| brand = "Zebra"; |
| break; |
| case P_DEV_ID_L64854: |
| brand = "DMA2"; |
| break; |
| default: |
| brand = "Unknown"; |
| } |
| printk("bpp%d: %s at %p\n", idx, brand, rp); |
| |
| /* |
| * Leave the port in compat idle mode. |
| */ |
| set_pins(BPP_PP_nAutoFd|BPP_PP_nStrobe|BPP_PP_nInit, idx); |
| |
| return; |
| } |
| |
| static inline void freeLptPort(int idx) |
| { |
| sbus_iounmap(base_addrs[idx], BPP_SIZE); |
| } |
| |
| #endif |
| |
| static int __init bpp_init(void) |
| { |
| int rc; |
| unsigned idx; |
| |
| rc = collectLptPorts(); |
| if (rc == 0) |
| return -ENODEV; |
| |
| rc = register_chrdev(BPP_MAJOR, dev_name, &bpp_fops); |
| if (rc < 0) |
| return rc; |
| |
| for (idx = 0; idx < BPP_NO; idx++) { |
| instances[idx].opened = 0; |
| probeLptPort(idx); |
| } |
| |
| return 0; |
| } |
| |
| static void __exit bpp_cleanup(void) |
| { |
| unsigned idx; |
| |
| unregister_chrdev(BPP_MAJOR, dev_name); |
| |
| for (idx = 0; idx < BPP_NO; idx++) { |
| if (instances[idx].present) |
| freeLptPort(idx); |
| } |
| } |
| |
| module_init(bpp_init); |
| module_exit(bpp_cleanup); |
| |
| MODULE_LICENSE("GPL"); |
| |
