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448 lines
12 KiB
448 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/drivers/acorn/scsi/powertec.c |
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* |
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* Copyright (C) 1997-2005 Russell King |
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*/ |
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#include <linux/module.h> |
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#include <linux/blkdev.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/ioport.h> |
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#include <linux/proc_fs.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/pgtable.h> |
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#include <asm/dma.h> |
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#include <asm/ecard.h> |
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#include <asm/io.h> |
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#include "../scsi.h" |
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#include <scsi/scsi_host.h> |
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#include "fas216.h" |
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#include "scsi.h" |
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#include <scsi/scsicam.h> |
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#define POWERTEC_FAS216_OFFSET 0x3000 |
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#define POWERTEC_FAS216_SHIFT 6 |
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#define POWERTEC_INTR_STATUS 0x2000 |
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#define POWERTEC_INTR_BIT 0x80 |
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#define POWERTEC_RESET_CONTROL 0x1018 |
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#define POWERTEC_RESET_BIT 1 |
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#define POWERTEC_TERM_CONTROL 0x2018 |
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#define POWERTEC_TERM_ENABLE 1 |
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#define POWERTEC_INTR_CONTROL 0x101c |
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#define POWERTEC_INTR_ENABLE 1 |
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#define POWERTEC_INTR_DISABLE 0 |
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#define VERSION "1.10 (19/01/2003 2.5.59)" |
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/* |
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* Use term=0,1,0,0,0 to turn terminators on/off. |
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* One entry per slot. |
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*/ |
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static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; |
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#define NR_SG 256 |
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struct powertec_info { |
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FAS216_Info info; |
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struct expansion_card *ec; |
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void __iomem *base; |
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unsigned int term_ctl; |
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struct scatterlist sg[NR_SG]; |
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}; |
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/* Prototype: void powertecscsi_irqenable(ec, irqnr) |
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* Purpose : Enable interrupts on Powertec SCSI card |
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* Params : ec - expansion card structure |
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* : irqnr - interrupt number |
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*/ |
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static void |
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powertecscsi_irqenable(struct expansion_card *ec, int irqnr) |
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{ |
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struct powertec_info *info = ec->irq_data; |
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writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); |
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} |
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/* Prototype: void powertecscsi_irqdisable(ec, irqnr) |
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* Purpose : Disable interrupts on Powertec SCSI card |
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* Params : ec - expansion card structure |
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* : irqnr - interrupt number |
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*/ |
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static void |
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powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) |
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{ |
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struct powertec_info *info = ec->irq_data; |
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writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); |
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} |
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static const expansioncard_ops_t powertecscsi_ops = { |
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.irqenable = powertecscsi_irqenable, |
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.irqdisable = powertecscsi_irqdisable, |
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}; |
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/* Prototype: void powertecscsi_terminator_ctl(host, on_off) |
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* Purpose : Turn the Powertec SCSI terminators on or off |
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* Params : host - card to turn on/off |
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* : on_off - !0 to turn on, 0 to turn off |
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*/ |
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static void |
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powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) |
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{ |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; |
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writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); |
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} |
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/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) |
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* Purpose : handle interrupts from Powertec SCSI card |
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* Params : irq - interrupt number |
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* dev_id - user-defined (Scsi_Host structure) |
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*/ |
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static irqreturn_t powertecscsi_intr(int irq, void *dev_id) |
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{ |
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struct powertec_info *info = dev_id; |
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return fas216_intr(&info->info); |
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} |
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/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) |
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* Purpose : initialises DMA/PIO |
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* Params : host - host |
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* SCpnt - command |
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* direction - DMA on to/off of card |
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* min_type - minimum DMA support that we must have for this transfer |
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* Returns : type of transfer to be performed |
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*/ |
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static fasdmatype_t |
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powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, |
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fasdmadir_t direction, fasdmatype_t min_type) |
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{ |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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struct device *dev = scsi_get_device(host); |
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int dmach = info->info.scsi.dma; |
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if (info->info.ifcfg.capabilities & FASCAP_DMA && |
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min_type == fasdma_real_all) { |
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int bufs, map_dir, dma_dir; |
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bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); |
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if (direction == DMA_OUT) { |
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map_dir = DMA_TO_DEVICE; |
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dma_dir = DMA_MODE_WRITE; |
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} else { |
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map_dir = DMA_FROM_DEVICE; |
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dma_dir = DMA_MODE_READ; |
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} |
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dma_map_sg(dev, info->sg, bufs, map_dir); |
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disable_dma(dmach); |
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set_dma_sg(dmach, info->sg, bufs); |
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set_dma_mode(dmach, dma_dir); |
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enable_dma(dmach); |
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return fasdma_real_all; |
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} |
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/* |
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* If we're not doing DMA, |
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* we'll do slow PIO |
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*/ |
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return fasdma_pio; |
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} |
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/* Prototype: int powertecscsi_dma_stop(host, SCpnt) |
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* Purpose : stops DMA/PIO |
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* Params : host - host |
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* SCpnt - command |
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*/ |
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static void |
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powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) |
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{ |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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if (info->info.scsi.dma != NO_DMA) |
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disable_dma(info->info.scsi.dma); |
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} |
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/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) |
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* Purpose : returns a descriptive string about this interface, |
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* Params : host - driver host structure to return info for. |
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* Returns : pointer to a static buffer containing null terminated string. |
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*/ |
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const char *powertecscsi_info(struct Scsi_Host *host) |
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{ |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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static char string[150]; |
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sprintf(string, "%s (%s) in slot %d v%s terminators o%s", |
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host->hostt->name, info->info.scsi.type, info->ec->slot_no, |
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VERSION, info->term_ctl ? "n" : "ff"); |
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return string; |
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} |
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/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) |
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* Purpose : Set a driver specific function |
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* Params : host - host to setup |
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* : buffer - buffer containing string describing operation |
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* : length - length of string |
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* Returns : -EINVAL, or 0 |
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*/ |
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static int |
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powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) |
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{ |
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int ret = length; |
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if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { |
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buffer += 12; |
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length -= 12; |
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if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { |
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if (buffer[5] == '1') |
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powertecscsi_terminator_ctl(host, 1); |
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else if (buffer[5] == '0') |
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powertecscsi_terminator_ctl(host, 0); |
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else |
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ret = -EINVAL; |
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} else |
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ret = -EINVAL; |
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} else |
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ret = -EINVAL; |
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return ret; |
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} |
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/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, |
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* int length, int host_no, int inout) |
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* Purpose : Return information about the driver to a user process accessing |
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* the /proc filesystem. |
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* Params : buffer - a buffer to write information to |
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* start - a pointer into this buffer set by this routine to the start |
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* of the required information. |
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* offset - offset into information that we have read up to. |
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* length - length of buffer |
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* inout - 0 for reading, 1 for writing. |
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* Returns : length of data written to buffer. |
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*/ |
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static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host) |
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{ |
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struct powertec_info *info; |
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info = (struct powertec_info *)host->hostdata; |
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seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION); |
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fas216_print_host(&info->info, m); |
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seq_printf(m, "Term : o%s\n", |
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info->term_ctl ? "n" : "ff"); |
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fas216_print_stats(&info->info, m); |
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fas216_print_devices(&info->info, m); |
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return 0; |
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} |
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static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct expansion_card *ec = ECARD_DEV(dev); |
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struct Scsi_Host *host = ecard_get_drvdata(ec); |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); |
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} |
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static ssize_t |
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powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) |
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{ |
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struct expansion_card *ec = ECARD_DEV(dev); |
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struct Scsi_Host *host = ecard_get_drvdata(ec); |
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if (len > 1) |
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powertecscsi_terminator_ctl(host, buf[0] != '0'); |
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return len; |
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} |
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static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, |
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powertecscsi_show_term, powertecscsi_store_term); |
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static struct scsi_host_template powertecscsi_template = { |
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.module = THIS_MODULE, |
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.show_info = powertecscsi_show_info, |
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.write_info = powertecscsi_set_proc_info, |
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.name = "PowerTec SCSI", |
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.info = powertecscsi_info, |
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.queuecommand = fas216_queue_command, |
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.eh_host_reset_handler = fas216_eh_host_reset, |
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.eh_bus_reset_handler = fas216_eh_bus_reset, |
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.eh_device_reset_handler = fas216_eh_device_reset, |
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.eh_abort_handler = fas216_eh_abort, |
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.can_queue = 8, |
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.this_id = 7, |
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.sg_tablesize = SG_MAX_SEGMENTS, |
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.dma_boundary = IOMD_DMA_BOUNDARY, |
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.cmd_per_lun = 2, |
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.proc_name = "powertec", |
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}; |
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static int powertecscsi_probe(struct expansion_card *ec, |
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const struct ecard_id *id) |
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{ |
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struct Scsi_Host *host; |
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struct powertec_info *info; |
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void __iomem *base; |
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int ret; |
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ret = ecard_request_resources(ec); |
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if (ret) |
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goto out; |
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base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); |
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if (!base) { |
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ret = -ENOMEM; |
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goto out_region; |
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} |
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host = scsi_host_alloc(&powertecscsi_template, |
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sizeof (struct powertec_info)); |
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if (!host) { |
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ret = -ENOMEM; |
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goto out_region; |
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} |
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ecard_set_drvdata(ec, host); |
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info = (struct powertec_info *)host->hostdata; |
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info->base = base; |
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powertecscsi_terminator_ctl(host, term[ec->slot_no]); |
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info->ec = ec; |
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info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; |
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info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; |
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info->info.scsi.irq = ec->irq; |
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info->info.scsi.dma = ec->dma; |
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info->info.ifcfg.clockrate = 40; /* MHz */ |
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info->info.ifcfg.select_timeout = 255; |
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info->info.ifcfg.asyncperiod = 200; /* ns */ |
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info->info.ifcfg.sync_max_depth = 7; |
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info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; |
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info->info.ifcfg.disconnect_ok = 1; |
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info->info.ifcfg.wide_max_size = 0; |
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info->info.ifcfg.capabilities = 0; |
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info->info.dma.setup = powertecscsi_dma_setup; |
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info->info.dma.pseudo = NULL; |
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info->info.dma.stop = powertecscsi_dma_stop; |
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ec->irqaddr = base + POWERTEC_INTR_STATUS; |
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ec->irqmask = POWERTEC_INTR_BIT; |
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ecard_setirq(ec, &powertecscsi_ops, info); |
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device_create_file(&ec->dev, &dev_attr_bus_term); |
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ret = fas216_init(host); |
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if (ret) |
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goto out_free; |
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ret = request_irq(ec->irq, powertecscsi_intr, |
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0, "powertec", info); |
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if (ret) { |
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printk("scsi%d: IRQ%d not free: %d\n", |
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host->host_no, ec->irq, ret); |
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goto out_release; |
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} |
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if (info->info.scsi.dma != NO_DMA) { |
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if (request_dma(info->info.scsi.dma, "powertec")) { |
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printk("scsi%d: DMA%d not free, using PIO\n", |
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host->host_no, info->info.scsi.dma); |
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info->info.scsi.dma = NO_DMA; |
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} else { |
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set_dma_speed(info->info.scsi.dma, 180); |
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info->info.ifcfg.capabilities |= FASCAP_DMA; |
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} |
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} |
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ret = fas216_add(host, &ec->dev); |
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if (ret == 0) |
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goto out; |
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if (info->info.scsi.dma != NO_DMA) |
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free_dma(info->info.scsi.dma); |
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free_irq(ec->irq, info); |
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out_release: |
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fas216_release(host); |
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out_free: |
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device_remove_file(&ec->dev, &dev_attr_bus_term); |
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scsi_host_put(host); |
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out_region: |
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ecard_release_resources(ec); |
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out: |
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return ret; |
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} |
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static void powertecscsi_remove(struct expansion_card *ec) |
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{ |
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struct Scsi_Host *host = ecard_get_drvdata(ec); |
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struct powertec_info *info = (struct powertec_info *)host->hostdata; |
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ecard_set_drvdata(ec, NULL); |
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fas216_remove(host); |
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device_remove_file(&ec->dev, &dev_attr_bus_term); |
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if (info->info.scsi.dma != NO_DMA) |
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free_dma(info->info.scsi.dma); |
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free_irq(ec->irq, info); |
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fas216_release(host); |
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scsi_host_put(host); |
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ecard_release_resources(ec); |
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} |
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static const struct ecard_id powertecscsi_cids[] = { |
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{ MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, |
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{ 0xffff, 0xffff }, |
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}; |
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static struct ecard_driver powertecscsi_driver = { |
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.probe = powertecscsi_probe, |
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.remove = powertecscsi_remove, |
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.id_table = powertecscsi_cids, |
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.drv = { |
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.name = "powertecscsi", |
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}, |
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}; |
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static int __init powertecscsi_init(void) |
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{ |
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return ecard_register_driver(&powertecscsi_driver); |
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} |
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static void __exit powertecscsi_exit(void) |
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{ |
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ecard_remove_driver(&powertecscsi_driver); |
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} |
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module_init(powertecscsi_init); |
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module_exit(powertecscsi_exit); |
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MODULE_AUTHOR("Russell King"); |
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MODULE_DESCRIPTION("Powertec SCSI driver"); |
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module_param_array(term, int, NULL, 0); |
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MODULE_PARM_DESC(term, "SCSI bus termination"); |
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MODULE_LICENSE("GPL");
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