/* * linux/drivers/acorn/scsi/eesox.c * * Copyright (C) 1997-2005 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This driver is based on experimentation. Hence, it may have made * assumptions about the particular card that I have available, and * may not be reliable! * * Changelog: * 01-10-1997 RMK Created, READONLY version * 15-02-1998 RMK READ/WRITE version * added DMA support and hardware definitions * 14-03-1998 RMK Updated DMA support * Added terminator control * 15-04-1998 RMK Only do PIO if FAS216 will allow it. * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h * 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new * error handling code. */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/proc_fs.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <asm/io.h> #include <asm/dma.h> #include <asm/ecard.h> #include <asm/pgtable.h> #include "../scsi.h" #include <scsi/scsi_host.h> #include "fas216.h" #include "scsi.h" #include <scsi/scsicam.h> #define EESOX_FAS216_OFFSET 0x3000 #define EESOX_FAS216_SHIFT 5 #define EESOX_DMASTAT 0x2800 #define EESOX_STAT_INTR 0x01 #define EESOX_STAT_DMA 0x02 #define EESOX_CONTROL 0x2800 #define EESOX_INTR_ENABLE 0x04 #define EESOX_TERM_ENABLE 0x02 #define EESOX_RESET 0x01 #define EESOX_DMADATA 0x3800 #define VERSION "1.10 (17/01/2003 2.5.59)" /* * Use term=0,1,0,0,0 to turn terminators on/off */ static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; #define NR_SG 256 struct eesoxscsi_info { FAS216_Info info; struct expansion_card *ec; void __iomem *base; void __iomem *ctl_port; unsigned int control; struct scatterlist sg[NR_SG]; /* Scatter DMA list */ }; /* Prototype: void eesoxscsi_irqenable(ec, irqnr) * Purpose : Enable interrupts on EESOX SCSI card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void eesoxscsi_irqenable(struct expansion_card *ec, int irqnr) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data; info->control |= EESOX_INTR_ENABLE; writeb(info->control, info->ctl_port); } /* Prototype: void eesoxscsi_irqdisable(ec, irqnr) * Purpose : Disable interrupts on EESOX SCSI card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data; info->control &= ~EESOX_INTR_ENABLE; writeb(info->control, info->ctl_port); } static const expansioncard_ops_t eesoxscsi_ops = { .irqenable = eesoxscsi_irqenable, .irqdisable = eesoxscsi_irqdisable, }; /* Prototype: void eesoxscsi_terminator_ctl(*host, on_off) * Purpose : Turn the EESOX SCSI terminators on or off * Params : host - card to turn on/off * : on_off - !0 to turn on, 0 to turn off */ static void eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; unsigned long flags; spin_lock_irqsave(host->host_lock, flags); if (on_off) info->control |= EESOX_TERM_ENABLE; else info->control &= ~EESOX_TERM_ENABLE; writeb(info->control, info->ctl_port); spin_unlock_irqrestore(host->host_lock, flags); } /* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs) * Purpose : handle interrupts from EESOX SCSI card * Params : irq - interrupt number * dev_id - user-defined (Scsi_Host structure) */ static irqreturn_t eesoxscsi_intr(int irq, void *dev_id) { struct eesoxscsi_info *info = dev_id; return fas216_intr(&info->info); } /* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type) * Purpose : initialises DMA/PIO * Params : host - host * SCpnt - command * direction - DMA on to/off of card * min_type - minimum DMA support that we must have for this transfer * Returns : type of transfer to be performed */ static fasdmatype_t eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_type) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; struct device *dev = scsi_get_device(host); int dmach = info->info.scsi.dma; if (dmach != NO_DMA && (min_type == fasdma_real_all || SCp->this_residual >= 512)) { int bufs, map_dir, dma_dir; bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); if (direction == DMA_OUT) map_dir = DMA_TO_DEVICE, dma_dir = DMA_MODE_WRITE; else map_dir = DMA_FROM_DEVICE, dma_dir = DMA_MODE_READ; dma_map_sg(dev, info->sg, bufs + 1, map_dir); disable_dma(dmach); set_dma_sg(dmach, info->sg, bufs + 1); set_dma_mode(dmach, dma_dir); enable_dma(dmach); return fasdma_real_all; } /* * We don't do DMA, we only do slow PIO * * Some day, we will do Pseudo DMA */ return fasdma_pseudo; } static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base) { const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET; const void __iomem *reg_dmastat = base + EESOX_DMASTAT; const void __iomem *reg_dmadata = base + EESOX_DMADATA; const register unsigned long mask = 0xffff; do { unsigned int status; /* * Interrupt request? */ status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT)); if (status & STAT_INT) break; /* * DMA request active? */ status = readb(reg_dmastat); if (!(status & EESOX_STAT_DMA)) continue; /* * Get number of bytes in FIFO */ status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF; if (status > 16) status = 16; if (status > length) status = length; /* * Align buffer. */ if (((u32)buf) & 2 && status >= 2) { *(u16 *)buf = readl(reg_dmadata); buf += 2; status -= 2; length -= 2; } if (status >= 8) { unsigned long l1, l2; l1 = readl(reg_dmadata) & mask; l1 |= readl(reg_dmadata) << 16; l2 = readl(reg_dmadata) & mask; l2 |= readl(reg_dmadata) << 16; *(u32 *)buf = l1; buf += 4; *(u32 *)buf = l2; buf += 4; length -= 8; continue; } if (status >= 4) { unsigned long l1; l1 = readl(reg_dmadata) & mask; l1 |= readl(reg_dmadata) << 16; *(u32 *)buf = l1; buf += 4; length -= 4; continue; } if (status >= 2) { *(u16 *)buf = readl(reg_dmadata); buf += 2; length -= 2; } } while (length); } static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base) { const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET; const void __iomem *reg_dmastat = base + EESOX_DMASTAT; const void __iomem *reg_dmadata = base + EESOX_DMADATA; do { unsigned int status; /* * Interrupt request? */ status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT)); if (status & STAT_INT) break; /* * DMA request active? */ status = readb(reg_dmastat); if (!(status & EESOX_STAT_DMA)) continue; /* * Get number of bytes in FIFO */ status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF; if (status > 16) status = 16; status = 16 - status; if (status > length) status = length; status &= ~1; /* * Align buffer. */ if (((u32)buf) & 2 && status >= 2) { writel(*(u16 *)buf << 16, reg_dmadata); buf += 2; status -= 2; length -= 2; } if (status >= 8) { unsigned long l1, l2; l1 = *(u32 *)buf; buf += 4; l2 = *(u32 *)buf; buf += 4; writel(l1 << 16, reg_dmadata); writel(l1, reg_dmadata); writel(l2 << 16, reg_dmadata); writel(l2, reg_dmadata); length -= 8; continue; } if (status >= 4) { unsigned long l1; l1 = *(u32 *)buf; buf += 4; writel(l1 << 16, reg_dmadata); writel(l1, reg_dmadata); length -= 4; continue; } if (status >= 2) { writel(*(u16 *)buf << 16, reg_dmadata); buf += 2; length -= 2; } } while (length); } static void eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t dir, int transfer_size) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; if (dir == DMA_IN) { eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base); } else { eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base); } } /* Prototype: int eesoxscsi_dma_stop(host, SCpnt) * Purpose : stops DMA/PIO * Params : host - host * SCpnt - command */ static void eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; if (info->info.scsi.dma != NO_DMA) disable_dma(info->info.scsi.dma); } /* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host) * Purpose : returns a descriptive string about this interface, * Params : host - driver host structure to return info for. * Returns : pointer to a static buffer containing null terminated string. */ const char *eesoxscsi_info(struct Scsi_Host *host) { struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; static char string[150]; sprintf(string, "%s (%s) in slot %d v%s terminators o%s", host->hostt->name, info->info.scsi.type, info->ec->slot_no, VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff"); return string; } /* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) * Purpose : Set a driver specific function * Params : host - host to setup * : buffer - buffer containing string describing operation * : length - length of string * Returns : -EINVAL, or 0 */ static int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) { int ret = length; if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) { buffer += 9; length -= 9; if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { if (buffer[5] == '1') eesoxscsi_terminator_ctl(host, 1); else if (buffer[5] == '0') eesoxscsi_terminator_ctl(host, 0); else ret = -EINVAL; } else ret = -EINVAL; } else ret = -EINVAL; return ret; } /* Prototype: int eesoxscsi_proc_info(char *buffer, char **start, off_t offset, * int length, int host_no, int inout) * Purpose : Return information about the driver to a user process accessing * the /proc filesystem. * Params : buffer - a buffer to write information to * start - a pointer into this buffer set by this routine to the start * of the required information. * offset - offset into information that we have read upto. * length - length of buffer * host_no - host number to return information for * inout - 0 for reading, 1 for writing. * Returns : length of data written to buffer. */ int eesoxscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) { struct eesoxscsi_info *info; char *p = buffer; int pos; if (inout == 1) return eesoxscsi_set_proc_info(host, buffer, length); info = (struct eesoxscsi_info *)host->hostdata; p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION); p += fas216_print_host(&info->info, p); p += sprintf(p, "Term : o%s\n", info->control & EESOX_TERM_ENABLE ? "n" : "ff"); p += fas216_print_stats(&info->info, p); p += fas216_print_devices(&info->info, p); *start = buffer + offset; pos = p - buffer - offset; if (pos > length) pos = length; return pos; } static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) { struct expansion_card *ec = ECARD_DEV(dev); struct Scsi_Host *host = ecard_get_drvdata(ec); struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0); } static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct expansion_card *ec = ECARD_DEV(dev); struct Scsi_Host *host = ecard_get_drvdata(ec); struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; unsigned long flags; if (len > 1) { spin_lock_irqsave(host->host_lock, flags); if (buf[0] != '0') { info->control |= EESOX_TERM_ENABLE; } else { info->control &= ~EESOX_TERM_ENABLE; } writeb(info->control, info->ctl_port); spin_unlock_irqrestore(host->host_lock, flags); } return len; } static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, eesoxscsi_show_term, eesoxscsi_store_term); static struct scsi_host_template eesox_template = { .module = THIS_MODULE, .proc_info = eesoxscsi_proc_info, .name = "EESOX SCSI", .info = eesoxscsi_info, .queuecommand = fas216_queue_command, .eh_host_reset_handler = fas216_eh_host_reset, .eh_bus_reset_handler = fas216_eh_bus_reset, .eh_device_reset_handler = fas216_eh_device_reset, .eh_abort_handler = fas216_eh_abort, .can_queue = 1, .this_id = 7, .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = DISABLE_CLUSTERING, .proc_name = "eesox", }; static int __devinit eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id) { struct Scsi_Host *host; struct eesoxscsi_info *info; unsigned long resbase, reslen; void __iomem *base; int ret; ret = ecard_request_resources(ec); if (ret) goto out; resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST); reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST); base = ioremap(resbase, reslen); if (!base) { ret = -ENOMEM; goto out_region; } host = scsi_host_alloc(&eesox_template, sizeof(struct eesoxscsi_info)); if (!host) { ret = -ENOMEM; goto out_unmap; } ecard_set_drvdata(ec, host); info = (struct eesoxscsi_info *)host->hostdata; info->ec = ec; info->base = base; info->ctl_port = base + EESOX_CONTROL; info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0; writeb(info->control, info->ctl_port); info->info.scsi.io_base = base + EESOX_FAS216_OFFSET; info->info.scsi.io_shift = EESOX_FAS216_SHIFT; info->info.scsi.irq = ec->irq; info->info.scsi.dma = ec->dma; info->info.ifcfg.clockrate = 40; /* MHz */ info->info.ifcfg.select_timeout = 255; info->info.ifcfg.asyncperiod = 200; /* ns */ info->info.ifcfg.sync_max_depth = 7; info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK; info->info.ifcfg.disconnect_ok = 1; info->info.ifcfg.wide_max_size = 0; info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; info->info.dma.setup = eesoxscsi_dma_setup; info->info.dma.pseudo = eesoxscsi_dma_pseudo; info->info.dma.stop = eesoxscsi_dma_stop; ec->irqaddr = base + EESOX_DMASTAT; ec->irqmask = EESOX_STAT_INTR; ec->irq_data = info; ec->ops = &eesoxscsi_ops; device_create_file(&ec->dev, &dev_attr_bus_term); ret = fas216_init(host); if (ret) goto out_free; ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info); if (ret) { printk("scsi%d: IRQ%d not free: %d\n", host->host_no, ec->irq, ret); goto out_remove; } if (info->info.scsi.dma != NO_DMA) { if (request_dma(info->info.scsi.dma, "eesox")) { printk("scsi%d: DMA%d not free, DMA disabled\n", host->host_no, info->info.scsi.dma); info->info.scsi.dma = NO_DMA; } else { set_dma_speed(info->info.scsi.dma, 180); info->info.ifcfg.capabilities |= FASCAP_DMA; info->info.ifcfg.cntl3 |= CNTL3_BS8; } } ret = fas216_add(host, &ec->dev); if (ret == 0) goto out; if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, host); out_remove: fas216_remove(host); out_free: device_remove_file(&ec->dev, &dev_attr_bus_term); scsi_host_put(host); out_unmap: iounmap(base); out_region: ecard_release_resources(ec); out: return ret; } static void __devexit eesoxscsi_remove(struct expansion_card *ec) { struct Scsi_Host *host = ecard_get_drvdata(ec); struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata; ecard_set_drvdata(ec, NULL); fas216_remove(host); if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, info); device_remove_file(&ec->dev, &dev_attr_bus_term); iounmap(info->base); fas216_release(host); scsi_host_put(host); ecard_release_resources(ec); } static const struct ecard_id eesoxscsi_cids[] = { { MANU_EESOX, PROD_EESOX_SCSI2 }, { 0xffff, 0xffff }, }; static struct ecard_driver eesoxscsi_driver = { .probe = eesoxscsi_probe, .remove = __devexit_p(eesoxscsi_remove), .id_table = eesoxscsi_cids, .drv = { .name = "eesoxscsi", }, }; static int __init eesox_init(void) { return ecard_register_driver(&eesoxscsi_driver); } static void __exit eesox_exit(void) { ecard_remove_driver(&eesoxscsi_driver); } module_init(eesox_init); module_exit(eesox_exit); MODULE_AUTHOR("Russell King"); MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines"); module_param_array(term, int, NULL, 0); MODULE_PARM_DESC(term, "SCSI bus termination"); MODULE_LICENSE("GPL");