382 lines
9.3 KiB
C
382 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* parport_sunbpp.c: Parallel-port routines for SBUS
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*
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* Author: Derrick J. Brashear <shadow@dementia.org>
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*
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* based on work by:
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* Phil Blundell <philb@gnu.org>
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* Tim Waugh <tim@cyberelk.demon.co.uk>
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* Jose Renau <renau@acm.org>
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* David Campbell <campbell@tirian.che.curtin.edu.au>
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* Grant Guenther <grant@torque.net>
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* Eddie C. Dost <ecd@skynet.be>
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* Stephen Williams (steve@icarus.com)
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* Gus Baldauf (gbaldauf@ix.netcom.com)
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* Peter Zaitcev
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* Tom Dyas
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*
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* Updated to new SBUS device framework: David S. Miller <davem@davemloft.net>
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*
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/parport.h>
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#include <asm/ptrace.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/oplib.h> /* OpenProm Library */
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#include <asm/dma.h> /* BPP uses LSI 64854 for DMA */
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#include <asm/irq.h>
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#include <asm/sunbpp.h>
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#undef __SUNBPP_DEBUG
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#ifdef __SUNBPP_DEBUG
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#define dprintk(x) printk x
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#else
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#define dprintk(x)
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#endif
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static void parport_sunbpp_disable_irq(struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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u32 tmp;
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tmp = sbus_readl(®s->p_csr);
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tmp &= ~DMA_INT_ENAB;
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sbus_writel(tmp, ®s->p_csr);
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}
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static void parport_sunbpp_enable_irq(struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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u32 tmp;
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tmp = sbus_readl(®s->p_csr);
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tmp |= DMA_INT_ENAB;
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sbus_writel(tmp, ®s->p_csr);
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}
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static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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sbus_writeb(d, ®s->p_dr);
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dprintk((KERN_DEBUG "wrote 0x%x\n", d));
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}
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static unsigned char parport_sunbpp_read_data(struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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return sbus_readb(®s->p_dr);
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}
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static unsigned char status_sunbpp_to_pc(struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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unsigned char bits = 0;
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unsigned char value_tcr = sbus_readb(®s->p_tcr);
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unsigned char value_ir = sbus_readb(®s->p_ir);
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if (!(value_ir & P_IR_ERR))
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bits |= PARPORT_STATUS_ERROR;
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if (!(value_ir & P_IR_SLCT))
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bits |= PARPORT_STATUS_SELECT;
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if (!(value_ir & P_IR_PE))
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bits |= PARPORT_STATUS_PAPEROUT;
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if (value_tcr & P_TCR_ACK)
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bits |= PARPORT_STATUS_ACK;
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if (!(value_tcr & P_TCR_BUSY))
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bits |= PARPORT_STATUS_BUSY;
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dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
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dprintk((KERN_DEBUG "read status 0x%x\n", bits));
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return bits;
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}
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static unsigned char control_sunbpp_to_pc(struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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unsigned char bits = 0;
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unsigned char value_tcr = sbus_readb(®s->p_tcr);
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unsigned char value_or = sbus_readb(®s->p_or);
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if (!(value_tcr & P_TCR_DS))
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bits |= PARPORT_CONTROL_STROBE;
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if (!(value_or & P_OR_AFXN))
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bits |= PARPORT_CONTROL_AUTOFD;
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if (!(value_or & P_OR_INIT))
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bits |= PARPORT_CONTROL_INIT;
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if (value_or & P_OR_SLCT_IN)
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bits |= PARPORT_CONTROL_SELECT;
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dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
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dprintk((KERN_DEBUG "read control 0x%x\n", bits));
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return bits;
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}
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static unsigned char parport_sunbpp_read_control(struct parport *p)
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{
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return control_sunbpp_to_pc(p);
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}
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static unsigned char parport_sunbpp_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 bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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unsigned char value_tcr = sbus_readb(®s->p_tcr);
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unsigned char value_or = sbus_readb(®s->p_or);
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dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
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value_tcr, value_or));
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if (mask & PARPORT_CONTROL_STROBE) {
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if (val & PARPORT_CONTROL_STROBE) {
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value_tcr &= ~P_TCR_DS;
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} else {
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value_tcr |= P_TCR_DS;
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}
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}
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if (mask & PARPORT_CONTROL_AUTOFD) {
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if (val & PARPORT_CONTROL_AUTOFD) {
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value_or &= ~P_OR_AFXN;
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} else {
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value_or |= P_OR_AFXN;
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}
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}
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if (mask & PARPORT_CONTROL_INIT) {
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if (val & PARPORT_CONTROL_INIT) {
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value_or &= ~P_OR_INIT;
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} else {
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value_or |= P_OR_INIT;
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}
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}
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if (mask & PARPORT_CONTROL_SELECT) {
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if (val & PARPORT_CONTROL_SELECT) {
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value_or |= P_OR_SLCT_IN;
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} else {
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value_or &= ~P_OR_SLCT_IN;
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}
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}
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sbus_writeb(value_or, ®s->p_or);
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sbus_writeb(value_tcr, ®s->p_tcr);
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dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
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value_tcr, value_or));
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return parport_sunbpp_read_control(p);
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}
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static void parport_sunbpp_write_control(struct parport *p, 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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parport_sunbpp_frob_control (p, wm, d & wm);
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}
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static unsigned char parport_sunbpp_read_status(struct parport *p)
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{
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return status_sunbpp_to_pc(p);
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}
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static void parport_sunbpp_data_forward (struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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unsigned char value_tcr = sbus_readb(®s->p_tcr);
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dprintk((KERN_DEBUG "forward\n"));
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value_tcr &= ~P_TCR_DIR;
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sbus_writeb(value_tcr, ®s->p_tcr);
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}
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static void parport_sunbpp_data_reverse (struct parport *p)
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{
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struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
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u8 val = sbus_readb(®s->p_tcr);
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dprintk((KERN_DEBUG "reverse\n"));
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val |= P_TCR_DIR;
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sbus_writeb(val, ®s->p_tcr);
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}
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static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
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{
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s->u.pc.ctr = 0xc;
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s->u.pc.ecr = 0x0;
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}
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static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
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{
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s->u.pc.ctr = parport_sunbpp_read_control(p);
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}
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static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
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{
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parport_sunbpp_write_control(p, s->u.pc.ctr);
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}
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static struct parport_operations parport_sunbpp_ops =
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{
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.write_data = parport_sunbpp_write_data,
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.read_data = parport_sunbpp_read_data,
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.write_control = parport_sunbpp_write_control,
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.read_control = parport_sunbpp_read_control,
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.frob_control = parport_sunbpp_frob_control,
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.read_status = parport_sunbpp_read_status,
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.enable_irq = parport_sunbpp_enable_irq,
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.disable_irq = parport_sunbpp_disable_irq,
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.data_forward = parport_sunbpp_data_forward,
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.data_reverse = parport_sunbpp_data_reverse,
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.init_state = parport_sunbpp_init_state,
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.save_state = parport_sunbpp_save_state,
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.restore_state = parport_sunbpp_restore_state,
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.epp_write_data = parport_ieee1284_epp_write_data,
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.epp_read_data = parport_ieee1284_epp_read_data,
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.epp_write_addr = parport_ieee1284_epp_write_addr,
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.epp_read_addr = parport_ieee1284_epp_read_addr,
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.ecp_write_data = parport_ieee1284_ecp_write_data,
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.ecp_read_data = parport_ieee1284_ecp_read_data,
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.ecp_write_addr = parport_ieee1284_ecp_write_addr,
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.compat_write_data = parport_ieee1284_write_compat,
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.nibble_read_data = parport_ieee1284_read_nibble,
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.byte_read_data = parport_ieee1284_read_byte,
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.owner = THIS_MODULE,
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};
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static int bpp_probe(struct platform_device *op)
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{
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struct parport_operations *ops;
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struct bpp_regs __iomem *regs;
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int irq, dma, err = 0, size;
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unsigned char value_tcr;
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void __iomem *base;
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struct parport *p;
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irq = op->archdata.irqs[0];
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base = of_ioremap(&op->resource[0], 0,
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resource_size(&op->resource[0]),
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"sunbpp");
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if (!base)
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return -ENODEV;
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size = resource_size(&op->resource[0]);
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dma = PARPORT_DMA_NONE;
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ops = kmemdup(&parport_sunbpp_ops, sizeof(struct parport_operations),
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GFP_KERNEL);
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if (!ops) {
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err = -ENOMEM;
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goto out_unmap;
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}
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dprintk(("register_port\n"));
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if (!(p = parport_register_port((unsigned long)base, irq, dma, ops))) {
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err = -ENOMEM;
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goto out_free_ops;
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}
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p->size = size;
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p->dev = &op->dev;
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if ((err = request_irq(p->irq, parport_irq_handler,
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IRQF_SHARED, p->name, p)) != 0) {
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goto out_put_port;
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}
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parport_sunbpp_enable_irq(p);
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regs = (struct bpp_regs __iomem *)p->base;
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value_tcr = sbus_readb(®s->p_tcr);
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value_tcr &= ~P_TCR_DIR;
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sbus_writeb(value_tcr, ®s->p_tcr);
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pr_info("%s: sunbpp at 0x%lx\n", p->name, p->base);
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dev_set_drvdata(&op->dev, p);
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parport_announce_port(p);
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return 0;
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out_put_port:
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parport_put_port(p);
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out_free_ops:
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kfree(ops);
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out_unmap:
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of_iounmap(&op->resource[0], base, size);
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return err;
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}
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static int bpp_remove(struct platform_device *op)
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{
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struct parport *p = dev_get_drvdata(&op->dev);
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struct parport_operations *ops = p->ops;
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parport_remove_port(p);
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if (p->irq != PARPORT_IRQ_NONE) {
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parport_sunbpp_disable_irq(p);
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free_irq(p->irq, p);
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}
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of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
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parport_put_port(p);
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kfree(ops);
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dev_set_drvdata(&op->dev, NULL);
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return 0;
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}
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static const struct of_device_id bpp_match[] = {
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{
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.name = "SUNW,bpp",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, bpp_match);
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static struct platform_driver bpp_sbus_driver = {
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.driver = {
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.name = "bpp",
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.of_match_table = bpp_match,
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},
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.probe = bpp_probe,
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.remove = bpp_remove,
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};
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module_platform_driver(bpp_sbus_driver);
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MODULE_AUTHOR("Derrick J Brashear");
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MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
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MODULE_VERSION("2.0");
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MODULE_LICENSE("GPL");
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