diff options
Diffstat (limited to 'drivers/scsi/arm/powertec.c')
| -rw-r--r-- | drivers/scsi/arm/powertec.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/drivers/scsi/arm/powertec.c b/drivers/scsi/arm/powertec.c new file mode 100644 index 000000000000..54f23be6460f --- /dev/null +++ b/drivers/scsi/arm/powertec.c @@ -0,0 +1,472 @@ +/* + * linux/drivers/acorn/scsi/powertec.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. + */ +#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/dma.h> +#include <asm/ecard.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/pgtable.h> + +#include "../scsi.h" +#include <scsi/scsi_host.h> +#include "fas216.h" +#include "scsi.h" + +#include <scsi/scsicam.h> + +#define POWERTEC_FAS216_OFFSET 0x3000 +#define POWERTEC_FAS216_SHIFT 6 + +#define POWERTEC_INTR_STATUS 0x2000 +#define POWERTEC_INTR_BIT 0x80 + +#define POWERTEC_RESET_CONTROL 0x1018 +#define POWERTEC_RESET_BIT 1 + +#define POWERTEC_TERM_CONTROL 0x2018 +#define POWERTEC_TERM_ENABLE 1 + +#define POWERTEC_INTR_CONTROL 0x101c +#define POWERTEC_INTR_ENABLE 1 +#define POWERTEC_INTR_DISABLE 0 + +#define VERSION "1.10 (19/01/2003 2.5.59)" + +/* + * Use term=0,1,0,0,0 to turn terminators on/off. + * One entry per slot. + */ +static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; + +#define NR_SG 256 + +struct powertec_info { + FAS216_Info info; + struct expansion_card *ec; + void __iomem *base; + unsigned int term_ctl; + struct scatterlist sg[NR_SG]; +}; + +/* Prototype: void powertecscsi_irqenable(ec, irqnr) + * Purpose : Enable interrupts on Powertec SCSI card + * Params : ec - expansion card structure + * : irqnr - interrupt number + */ +static void +powertecscsi_irqenable(struct expansion_card *ec, int irqnr) +{ + struct powertec_info *info = ec->irq_data; + writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); +} + +/* Prototype: void powertecscsi_irqdisable(ec, irqnr) + * Purpose : Disable interrupts on Powertec SCSI card + * Params : ec - expansion card structure + * : irqnr - interrupt number + */ +static void +powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) +{ + struct powertec_info *info = ec->irq_data; + writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); +} + +static const expansioncard_ops_t powertecscsi_ops = { + .irqenable = powertecscsi_irqenable, + .irqdisable = powertecscsi_irqdisable, +}; + +/* Prototype: void powertecscsi_terminator_ctl(host, on_off) + * Purpose : Turn the Powertec SCSI terminators on or off + * Params : host - card to turn on/off + * : on_off - !0 to turn on, 0 to turn off + */ +static void +powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) +{ + struct powertec_info *info = (struct powertec_info *)host->hostdata; + + info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; + writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); +} + +/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) + * Purpose : handle interrupts from Powertec SCSI card + * Params : irq - interrupt number + * dev_id - user-defined (Scsi_Host structure) + * regs - processor registers at interrupt + */ +static irqreturn_t +powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs) +{ + struct powertec_info *info = dev_id; + + return fas216_intr(&info->info); +} + +/* Prototype: fasdmatype_t powertecscsi_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 +powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp, + fasdmadir_t direction, fasdmatype_t min_type) +{ + struct powertec_info *info = (struct powertec_info *)host->hostdata; + struct device *dev = scsi_get_device(host); + int dmach = info->info.scsi.dma; + + if (info->info.ifcfg.capabilities & FASCAP_DMA && + min_type == fasdma_real_all) { + 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; + } + + /* + * If we're not doing DMA, + * we'll do slow PIO + */ + return fasdma_pio; +} + +/* Prototype: int powertecscsi_dma_stop(host, SCpnt) + * Purpose : stops DMA/PIO + * Params : host - host + * SCpnt - command + */ +static void +powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp) +{ + struct powertec_info *info = (struct powertec_info *)host->hostdata; + if (info->info.scsi.dma != NO_DMA) + disable_dma(info->info.scsi.dma); +} + +/* Prototype: const char *powertecscsi_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 *powertecscsi_info(struct Scsi_Host *host) +{ + struct powertec_info *info = (struct powertec_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->term_ctl ? "n" : "ff"); + + return string; +} + +/* Prototype: int powertecscsi_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 +powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) +{ + int ret = length; + + if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { + buffer += 12; + length -= 12; + + if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { + if (buffer[5] == '1') + powertecscsi_terminator_ctl(host, 1); + else if (buffer[5] == '0') + powertecscsi_terminator_ctl(host, 0); + else + ret = -EINVAL; + } else + ret = -EINVAL; + } else + ret = -EINVAL; + + return ret; +} + +/* Prototype: int powertecscsi_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 + * inout - 0 for reading, 1 for writing. + * Returns : length of data written to buffer. + */ +int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, + int length, int inout) +{ + struct powertec_info *info; + char *p = buffer; + int pos; + + if (inout == 1) + return powertecscsi_set_proc_info(host, buffer, length); + + info = (struct powertec_info *)host->hostdata; + + p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); + p += fas216_print_host(&info->info, p); + p += sprintf(p, "Term : o%s\n", + info->term_ctl ? "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 powertecscsi_show_term(struct device *dev, char *buf) +{ + struct expansion_card *ec = ECARD_DEV(dev); + struct Scsi_Host *host = ecard_get_drvdata(ec); + struct powertec_info *info = (struct powertec_info *)host->hostdata; + + return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); +} + +static ssize_t +powertecscsi_store_term(struct device *dev, const char *buf, size_t len) +{ + struct expansion_card *ec = ECARD_DEV(dev); + struct Scsi_Host *host = ecard_get_drvdata(ec); + + if (len > 1) + powertecscsi_terminator_ctl(host, buf[0] != '0'); + + return len; +} + +static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, + powertecscsi_show_term, powertecscsi_store_term); + +static Scsi_Host_Template powertecscsi_template = { + .module = THIS_MODULE, + .proc_info = powertecscsi_proc_info, + .name = "PowerTec SCSI", + .info = powertecscsi_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 = 8, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 2, + .use_clustering = ENABLE_CLUSTERING, + .proc_name = "powertec", +}; + +static int __devinit +powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) +{ + struct Scsi_Host *host; + struct powertec_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(&powertecscsi_template, + sizeof (struct powertec_info)); + if (!host) { + ret = -ENOMEM; + goto out_unmap; + } + + ecard_set_drvdata(ec, host); + + info = (struct powertec_info *)host->hostdata; + info->base = base; + powertecscsi_terminator_ctl(host, term[ec->slot_no]); + + info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; + info->info.scsi.io_shift = POWERTEC_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_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; + info->info.ifcfg.disconnect_ok = 1; + info->info.ifcfg.wide_max_size = 0; + info->info.ifcfg.capabilities = 0; + info->info.dma.setup = powertecscsi_dma_setup; + info->info.dma.pseudo = NULL; + info->info.dma.stop = powertecscsi_dma_stop; + + ec->irqaddr = base + POWERTEC_INTR_STATUS; + ec->irqmask = POWERTEC_INTR_BIT; + ec->irq_data = info; + ec->ops = &powertecscsi_ops; + + device_create_file(&ec->dev, &dev_attr_bus_term); + + ret = fas216_init(host); + if (ret) + goto out_free; + + ret = request_irq(ec->irq, powertecscsi_intr, + SA_INTERRUPT, "powertec", info); + if (ret) { + printk("scsi%d: IRQ%d not free: %d\n", + host->host_no, ec->irq, ret); + goto out_release; + } + + if (info->info.scsi.dma != NO_DMA) { + if (request_dma(info->info.scsi.dma, "powertec")) { + printk("scsi%d: DMA%d not free, using PIO\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; + } + } + + 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_release: + fas216_release(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 powertecscsi_remove(struct expansion_card *ec) +{ + struct Scsi_Host *host = ecard_get_drvdata(ec); + struct powertec_info *info = (struct powertec_info *)host->hostdata; + + ecard_set_drvdata(ec, NULL); + fas216_remove(host); + + device_remove_file(&ec->dev, &dev_attr_bus_term); + + if (info->info.scsi.dma != NO_DMA) + free_dma(info->info.scsi.dma); + free_irq(ec->irq, info); + + iounmap(info->base); + + fas216_release(host); + scsi_host_put(host); + ecard_release_resources(ec); +} + +static const struct ecard_id powertecscsi_cids[] = { + { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, + { 0xffff, 0xffff }, +}; + +static struct ecard_driver powertecscsi_driver = { + .probe = powertecscsi_probe, + .remove = __devexit_p(powertecscsi_remove), + .id_table = powertecscsi_cids, + .drv = { + .name = "powertecscsi", + }, +}; + +static int __init powertecscsi_init(void) +{ + return ecard_register_driver(&powertecscsi_driver); +} + +static void __exit powertecscsi_exit(void) +{ + ecard_remove_driver(&powertecscsi_driver); +} + +module_init(powertecscsi_init); +module_exit(powertecscsi_exit); + +MODULE_AUTHOR("Russell King"); +MODULE_DESCRIPTION("Powertec SCSI driver"); +MODULE_PARM(term, "1-8i"); +MODULE_PARM_DESC(term, "SCSI bus termination"); +MODULE_LICENSE("GPL"); |