| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Finn Thain | 1599 | 57.37% | 26 | 44.07% |
| Linus Torvalds (pre-git) | 1111 | 39.86% | 15 | 25.42% |
| Geert Uytterhoeven | 26 | 0.93% | 4 | 6.78% |
| Rusty Russell | 16 | 0.57% | 1 | 1.69% |
| Roman Zippel | 7 | 0.25% | 2 | 3.39% |
| Linus Torvalds | 7 | 0.25% | 1 | 1.69% |
| Christoph Hellwig | 5 | 0.18% | 2 | 3.39% |
| Hannes Reinecke | 4 | 0.14% | 1 | 1.69% |
| Adrian Bunk | 4 | 0.14% | 2 | 3.39% |
| Arnd Bergmann | 3 | 0.11% | 1 | 1.69% |
| Jeff Garzik | 2 | 0.07% | 1 | 1.69% |
| Michael Schmitz | 2 | 0.07% | 2 | 3.39% |
| Arjan van de Ven | 1 | 0.04% | 1 | 1.69% |
| Total | 2787 | 59 |
/* * atari_scsi.c -- Device dependent functions for the Atari generic SCSI port * * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> * * Loosely based on the work of Robert De Vries' team and added: * - working real DMA * - Falcon support (untested yet!) ++bjoern fixed and now it works * - lots of extensions and bug fixes. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. * */ /* * Notes for Falcon SCSI DMA * * The 5380 device is one of several that all share the DMA chip. Hence * "locking" and "unlocking" access to this chip is required. * * Two possible schemes for ST DMA acquisition by atari_scsi are: * 1) The lock is taken for each command separately (i.e. can_queue == 1). * 2) The lock is taken when the first command arrives and released * when the last command is finished (i.e. can_queue > 1). * * The first alternative limits SCSI bus utilization, since interleaving * commands is not possible. The second gives better performance but is * unfair to other drivers needing to use the ST DMA chip. In order to * allow the IDE and floppy drivers equal access to the ST DMA chip * the default is can_queue == 1. */ #include <linux/module.h> #include <linux/types.h> #include <linux/blkdev.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/nvram.h> #include <linux/bitops.h> #include <linux/wait.h> #include <linux/platform_device.h> #include <asm/setup.h> #include <asm/atarihw.h> #include <asm/atariints.h> #include <asm/atari_stdma.h> #include <asm/atari_stram.h> #include <asm/io.h> #include <scsi/scsi_host.h> #define DMA_MIN_SIZE 32 /* Definitions for the core NCR5380 driver. */ #define NCR5380_implementation_fields /* none */ static u8 (*atari_scsi_reg_read)(unsigned int); static void (*atari_scsi_reg_write)(unsigned int, u8); #define NCR5380_read(reg) atari_scsi_reg_read(reg) #define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value) #define NCR5380_queue_command atari_scsi_queue_command #define NCR5380_abort atari_scsi_abort #define NCR5380_info atari_scsi_info #define NCR5380_dma_xfer_len atari_scsi_dma_xfer_len #define NCR5380_dma_recv_setup atari_scsi_dma_recv_setup #define NCR5380_dma_send_setup atari_scsi_dma_send_setup #define NCR5380_dma_residual atari_scsi_dma_residual #define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance) #define NCR5380_release_dma_irq(instance) falcon_release_lock() #include "NCR5380.h" #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) #define SCSI_DMA_WRITE_P(elt,val) \ do { \ unsigned long v = val; \ tt_scsi_dma.elt##_lo = v & 0xff; \ v >>= 8; \ tt_scsi_dma.elt##_lmd = v & 0xff; \ v >>= 8; \ tt_scsi_dma.elt##_hmd = v & 0xff; \ v >>= 8; \ tt_scsi_dma.elt##_hi = v & 0xff; \ } while(0) #define SCSI_DMA_READ_P(elt) \ (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ (unsigned long)tt_scsi_dma.elt##_lo) static inline void SCSI_DMA_SETADR(unsigned long adr) { st_dma.dma_lo = (unsigned char)adr; MFPDELAY(); adr >>= 8; st_dma.dma_md = (unsigned char)adr; MFPDELAY(); adr >>= 8; st_dma.dma_hi = (unsigned char)adr; MFPDELAY(); } static inline unsigned long SCSI_DMA_GETADR(void) { unsigned long adr; adr = st_dma.dma_lo; MFPDELAY(); adr |= (st_dma.dma_md & 0xff) << 8; MFPDELAY(); adr |= (st_dma.dma_hi & 0xff) << 16; MFPDELAY(); return adr; } static void atari_scsi_fetch_restbytes(void); static unsigned long atari_dma_residual, atari_dma_startaddr; static short atari_dma_active; /* pointer to the dribble buffer */ static char *atari_dma_buffer; /* precalculated physical address of the dribble buffer */ static unsigned long atari_dma_phys_buffer; /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ static char *atari_dma_orig_addr; /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use * scatter-gather anyway, so most transfers are 1024 byte only. In the rare * cases where requests to physical contiguous buffers have been merged, this * request is <= 4k (one page). So I don't think we have to split transfers * just due to this buffer size... */ #define STRAM_BUFFER_SIZE (4096) /* mask for address bits that can't be used with the ST-DMA */ static unsigned long atari_dma_stram_mask; #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) static int setup_can_queue = -1; module_param(setup_can_queue, int, 0); static int setup_cmd_per_lun = -1; module_param(setup_cmd_per_lun, int, 0); static int setup_sg_tablesize = -1; module_param(setup_sg_tablesize, int, 0); static int setup_hostid = -1; module_param(setup_hostid, int, 0); static int setup_toshiba_delay = -1; module_param(setup_toshiba_delay, int, 0); static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) { int i; unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; if (dma_stat & 0x01) { /* A bus error happens when DMA-ing from the last page of a * physical memory chunk (DMA prefetch!), but that doesn't hurt. * Check for this case: */ for (i = 0; i < m68k_num_memory; ++i) { end_addr = m68k_memory[i].addr + m68k_memory[i].size; if (end_addr <= addr && addr <= end_addr + 4) return 1; } } return 0; } static irqreturn_t scsi_tt_intr(int irq, void *dev) { struct Scsi_Host *instance = dev; struct NCR5380_hostdata *hostdata = shost_priv(instance); int dma_stat; dma_stat = tt_scsi_dma.dma_ctrl; dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n", dma_stat & 0xff); /* Look if it was the DMA that has interrupted: First possibility * is that a bus error occurred... */ if (dma_stat & 0x80) { if (!scsi_dma_is_ignored_buserr(dma_stat)) { printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", SCSI_DMA_READ_P(dma_addr)); printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); } } /* If the DMA is active but not finished, we have the case * that some other 5380 interrupt occurred within the DMA transfer. * This means we have residual bytes, if the desired end address * is not yet reached. Maybe we have to fetch some bytes from the * rest data register, too. The residual must be calculated from * the address pointer, not the counter register, because only the * addr reg counts bytes not yet written and pending in the rest * data reg! */ if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { atari_dma_residual = hostdata->dma_len - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", atari_dma_residual); if ((signed int)atari_dma_residual < 0) atari_dma_residual = 0; if ((dma_stat & 1) == 0) { /* * After read operations, we maybe have to * transport some rest bytes */ atari_scsi_fetch_restbytes(); } else { /* * There seems to be a nasty bug in some SCSI-DMA/NCR * combinations: If a target disconnects while a write * operation is going on, the address register of the * DMA may be a few bytes farer than it actually read. * This is probably due to DMA prefetching and a delay * between DMA and NCR. Experiments showed that the * dma_addr is 9 bytes to high, but this could vary. * The problem is, that the residual is thus calculated * wrong and the next transfer will start behind where * it should. So we round up the residual to the next * multiple of a sector size, if it isn't already a * multiple and the originally expected transfer size * was. The latter condition is there to ensure that * the correction is taken only for "real" data * transfers and not for, e.g., the parameters of some * other command. These shouldn't disconnect anyway. */ if (atari_dma_residual & 0x1ff) { dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, " "difference %ld bytes\n", 512 - (atari_dma_residual & 0x1ff)); atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; } } tt_scsi_dma.dma_ctrl = 0; } /* If the DMA is finished, fetch the rest bytes and turn it off */ if (dma_stat & 0x40) { atari_dma_residual = 0; if ((dma_stat & 1) == 0) atari_scsi_fetch_restbytes(); tt_scsi_dma.dma_ctrl = 0; } NCR5380_intr(irq, dev); return IRQ_HANDLED; } static irqreturn_t scsi_falcon_intr(int irq, void *dev) { struct Scsi_Host *instance = dev; struct NCR5380_hostdata *hostdata = shost_priv(instance); int dma_stat; /* Turn off DMA and select sector counter register before * accessing the status register (Atari recommendation!) */ st_dma.dma_mode_status = 0x90; dma_stat = st_dma.dma_mode_status; /* Bit 0 indicates some error in the DMA process... don't know * what happened exactly (no further docu). */ if (!(dma_stat & 0x01)) { /* DMA error */ printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); } /* If the DMA was active, but now bit 1 is not clear, it is some * other 5380 interrupt that finishes the DMA transfer. We have to * calculate the number of residual bytes and give a warning if * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) */ if (atari_dma_active && (dma_stat & 0x02)) { unsigned long transferred; transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; /* The ST-DMA address is incremented in 2-byte steps, but the * data are written only in 16-byte chunks. If the number of * transferred bytes is not divisible by 16, the remainder is * lost somewhere in outer space. */ if (transferred & 15) printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " "ST-DMA fifo\n", transferred & 15); atari_dma_residual = hostdata->dma_len - transferred; dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", atari_dma_residual); } else atari_dma_residual = 0; atari_dma_active = 0; if (atari_dma_orig_addr) { /* If the dribble buffer was used on a read operation, copy the DMA-ed * data to the original destination address. */ memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), hostdata->dma_len - atari_dma_residual); atari_dma_orig_addr = NULL; } NCR5380_intr(irq, dev); return IRQ_HANDLED; } static void atari_scsi_fetch_restbytes(void) { int nr; char *src, *dst; unsigned long phys_dst; /* fetch rest bytes in the DMA register */ phys_dst = SCSI_DMA_READ_P(dma_addr); nr = phys_dst & 3; if (nr) { /* there are 'nr' bytes left for the last long address before the DMA pointer */ phys_dst ^= nr; dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", nr, phys_dst); /* The content of the DMA pointer is a physical address! */ dst = phys_to_virt(phys_dst); dprintk(NDEBUG_DMA, " = virt addr %p\n", dst); for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) *dst++ = *src++; } } /* This function releases the lock on the DMA chip if there is no * connected command and the disconnected queue is empty. */ static void falcon_release_lock(void) { if (IS_A_TT()) return; if (stdma_is_locked_by(scsi_falcon_intr)) stdma_release(); } /* This function manages the locking of the ST-DMA. * If the DMA isn't locked already for SCSI, it tries to lock it by * calling stdma_lock(). But if the DMA is locked by the SCSI code and * there are other drivers waiting for the chip, we do not issue the * command immediately but tell the SCSI mid-layer to defer. */ static int falcon_get_lock(struct Scsi_Host *instance) { if (IS_A_TT()) return 1; if (stdma_is_locked_by(scsi_falcon_intr) && instance->hostt->can_queue > 1) return 1; if (in_interrupt()) return stdma_try_lock(scsi_falcon_intr, instance); stdma_lock(scsi_falcon_intr, instance); return 1; } #ifndef MODULE static int __init atari_scsi_setup(char *str) { /* Format of atascsi parameter is: * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> * Defaults depend on TT or Falcon, determined at run time. * Negative values mean don't change. */ int ints[8]; get_options(str, ARRAY_SIZE(ints), ints); if (ints[0] < 1) { printk("atari_scsi_setup: no arguments!\n"); return 0; } if (ints[0] >= 1) setup_can_queue = ints[1]; if (ints[0] >= 2) setup_cmd_per_lun = ints[2]; if (ints[0] >= 3) setup_sg_tablesize = ints[3]; if (ints[0] >= 4) setup_hostid = ints[4]; /* ints[5] (use_tagged_queuing) is ignored */ /* ints[6] (use_pdma) is ignored */ if (ints[0] >= 7) setup_toshiba_delay = ints[7]; return 1; } __setup("atascsi=", atari_scsi_setup); #endif /* !MODULE */ static unsigned long atari_scsi_dma_setup(struct NCR5380_hostdata *hostdata, void *data, unsigned long count, int dir) { unsigned long addr = virt_to_phys(data); dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, dir = %d\n", hostdata->host->host_no, data, addr, count, dir); if (!IS_A_TT() && !STRAM_ADDR(addr)) { /* If we have a non-DMAable address on a Falcon, use the dribble * buffer; 'orig_addr' != 0 in the read case tells the interrupt * handler to copy data from the dribble buffer to the originally * wanted address. */ if (dir) memcpy(atari_dma_buffer, data, count); else atari_dma_orig_addr = data; addr = atari_dma_phys_buffer; } atari_dma_startaddr = addr; /* Needed for calculating residual later. */ /* Cache cleanup stuff: On writes, push any dirty cache out before sending * it to the peripheral. (Must be done before DMA setup, since at least * the ST-DMA begins to fill internal buffers right after setup. For * reads, invalidate any cache, may be altered after DMA without CPU * knowledge. * * ++roman: For the Medusa, there's no need at all for that cache stuff, * because the hardware does bus snooping (fine!). */ dma_cache_maintenance(addr, count, dir); if (IS_A_TT()) { tt_scsi_dma.dma_ctrl = dir; SCSI_DMA_WRITE_P(dma_addr, addr); SCSI_DMA_WRITE_P(dma_cnt, count); tt_scsi_dma.dma_ctrl = dir | 2; } else { /* ! IS_A_TT */ /* set address */ SCSI_DMA_SETADR(addr); /* toggle direction bit to clear FIFO and set DMA direction */ dir <<= 8; st_dma.dma_mode_status = 0x90 | dir; st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); st_dma.dma_mode_status = 0x90 | dir; udelay(40); /* On writes, round up the transfer length to the next multiple of 512 * (see also comment at atari_dma_xfer_len()). */ st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; udelay(40); st_dma.dma_mode_status = 0x10 | dir; udelay(40); /* need not restore value of dir, only boolean value is tested */ atari_dma_active = 1; } return count; } static inline int atari_scsi_dma_recv_setup(struct NCR5380_hostdata *hostdata, unsigned char *data, int count) { return atari_scsi_dma_setup(hostdata, data, count, 0); } static inline int atari_scsi_dma_send_setup(struct NCR5380_hostdata *hostdata, unsigned char *data, int count) { return atari_scsi_dma_setup(hostdata, data, count, 1); } static int atari_scsi_dma_residual(struct NCR5380_hostdata *hostdata) { return atari_dma_residual; } #define CMD_SURELY_BLOCK_MODE 0 #define CMD_SURELY_BYTE_MODE 1 #define CMD_MODE_UNKNOWN 2 static int falcon_classify_cmd(struct scsi_cmnd *cmd) { unsigned char opcode = cmd->cmnd[0]; if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || opcode == READ_BUFFER) return CMD_SURELY_BYTE_MODE; else if (opcode == READ_6 || opcode == READ_10 || opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || opcode == RECOVER_BUFFERED_DATA) { /* In case of a sequential-access target (tape), special care is * needed here: The transfer is block-mode only if the 'fixed' bit is * set! */ if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) return CMD_SURELY_BYTE_MODE; else return CMD_SURELY_BLOCK_MODE; } else return CMD_MODE_UNKNOWN; } /* This function calculates the number of bytes that can be transferred via * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the * ST-DMA chip. There are only multiples of 512 bytes possible and max. * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not * possible on the Falcon, since that would require to program the DMA for * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have * the overrun problem, so this question is academic :-) */ static int atari_scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata, struct scsi_cmnd *cmd) { int wanted_len = cmd->SCp.this_residual; int possible_len, limit; if (wanted_len < DMA_MIN_SIZE) return 0; if (IS_A_TT()) /* TT SCSI DMA can transfer arbitrary #bytes */ return wanted_len; /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. * 255*512 bytes, but this should be enough) * * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands * that return a number of bytes which cannot be known beforehand. In this * case, the given transfer length is an "allocation length". Now it * can happen that this allocation length is a multiple of 512 bytes and * the DMA is used. But if not n*512 bytes really arrive, some input data * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish * between commands that do block transfers and those that do byte * transfers. But this isn't easy... there are lots of vendor specific * commands, and the user can issue any command via the * SCSI_IOCTL_SEND_COMMAND. * * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) * and 3), the thing to do is obvious: allow any number of blocks via DMA * or none. In case 2), we apply some heuristic: Byte mode is assumed if * the transfer (allocation) length is < 1024, hoping that no cmd. not * explicitly known as byte mode have such big allocation lengths... * BTW, all the discussion above applies only to reads. DMA writes are * unproblematic anyways, since the targets aborts the transfer after * receiving a sufficient number of bytes. * * Another point: If the transfer is from/to an non-ST-RAM address, we * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. */ if (cmd->sc_data_direction == DMA_TO_DEVICE) { /* Write operation can always use the DMA, but the transfer size must * be rounded up to the next multiple of 512 (atari_dma_setup() does * this). */ possible_len = wanted_len; } else { /* Read operations: if the wanted transfer length is not a multiple of * 512, we cannot use DMA, since the ST-DMA cannot split transfers * (no interrupt on DMA finished!) */ if (wanted_len & 0x1ff) possible_len = 0; else { /* Now classify the command (see above) and decide whether it is * allowed to do DMA at all */ switch (falcon_classify_cmd(cmd)) { case CMD_SURELY_BLOCK_MODE: possible_len = wanted_len; break; case CMD_SURELY_BYTE_MODE: possible_len = 0; /* DMA prohibited */ break; case CMD_MODE_UNKNOWN: default: /* For unknown commands assume block transfers if the transfer * size/allocation length is >= 1024 */ possible_len = (wanted_len < 1024) ? 0 : wanted_len; break; } } } /* Last step: apply the hard limit on DMA transfers */ limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? STRAM_BUFFER_SIZE : 255*512; if (possible_len > limit) possible_len = limit; if (possible_len != wanted_len) dprintk(NDEBUG_DMA, "DMA transfer now %d bytes instead of %d\n", possible_len, wanted_len); return possible_len; } /* NCR5380 register access functions * * There are separate functions for TT and Falcon, because the access * methods are quite different. The calling macros NCR5380_read and * NCR5380_write call these functions via function pointers. */ static u8 atari_scsi_tt_reg_read(unsigned int reg) { return tt_scsi_regp[reg * 2]; } static void atari_scsi_tt_reg_write(unsigned int reg, u8 value) { tt_scsi_regp[reg * 2] = value; } static u8 atari_scsi_falcon_reg_read(unsigned int reg) { unsigned long flags; u8 result; reg += 0x88; local_irq_save(flags); dma_wd.dma_mode_status = (u_short)reg; result = (u8)dma_wd.fdc_acces_seccount; local_irq_restore(flags); return result; } static void atari_scsi_falcon_reg_write(unsigned int reg, u8 value) { unsigned long flags; reg += 0x88; local_irq_save(flags); dma_wd.dma_mode_status = (u_short)reg; dma_wd.fdc_acces_seccount = (u_short)value; local_irq_restore(flags); } #include "NCR5380.c" static int atari_scsi_host_reset(struct scsi_cmnd *cmd) { int rv; unsigned long flags; local_irq_save(flags); /* Abort a maybe active DMA transfer */ if (IS_A_TT()) { tt_scsi_dma.dma_ctrl = 0; } else { if (stdma_is_locked_by(scsi_falcon_intr)) st_dma.dma_mode_status = 0x90; atari_dma_active = 0; atari_dma_orig_addr = NULL; } rv = NCR5380_host_reset(cmd); /* The 5380 raises its IRQ line while _RST is active but the ST DMA * "lock" has been released so this interrupt may end up handled by * floppy or IDE driver (if one of them holds the lock). The NCR5380 * interrupt flag has been cleared already. */ local_irq_restore(flags); return rv; } #define DRV_MODULE_NAME "atari_scsi" #define PFX DRV_MODULE_NAME ": " static struct scsi_host_template atari_scsi_template = { .module = THIS_MODULE, .proc_name = DRV_MODULE_NAME, .name = "Atari native SCSI", .info = atari_scsi_info, .queuecommand = atari_scsi_queue_command, .eh_abort_handler = atari_scsi_abort, .eh_host_reset_handler = atari_scsi_host_reset, .this_id = 7, .cmd_per_lun = 2, .dma_boundary = PAGE_SIZE - 1, .cmd_size = NCR5380_CMD_SIZE, }; static int __init atari_scsi_probe(struct platform_device *pdev) { struct Scsi_Host *instance; int error; struct resource *irq; int host_flags = 0; irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (!irq) return -ENODEV; if (ATARIHW_PRESENT(TT_SCSI)) { atari_scsi_reg_read = atari_scsi_tt_reg_read; atari_scsi_reg_write = atari_scsi_tt_reg_write; } else { atari_scsi_reg_read = atari_scsi_falcon_reg_read; atari_scsi_reg_write = atari_scsi_falcon_reg_write; } if (ATARIHW_PRESENT(TT_SCSI)) { atari_scsi_template.can_queue = 16; atari_scsi_template.sg_tablesize = SG_ALL; } else { atari_scsi_template.can_queue = 1; atari_scsi_template.sg_tablesize = SG_NONE; } if (setup_can_queue > 0) atari_scsi_template.can_queue = setup_can_queue; if (setup_cmd_per_lun > 0) atari_scsi_template.cmd_per_lun = setup_cmd_per_lun; /* Leave sg_tablesize at 0 on a Falcon! */ if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0) atari_scsi_template.sg_tablesize = setup_sg_tablesize; if (setup_hostid >= 0) { atari_scsi_template.this_id = setup_hostid & 7; } else { /* Test if a host id is set in the NVRam */ if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { unsigned char b = nvram_read_byte(16); /* Arbitration enabled? (for TOS) * If yes, use configured host ID */ if (b & 0x80) atari_scsi_template.this_id = b & 7; } } /* If running on a Falcon and if there's TT-Ram (i.e., more than one * memory block, since there's always ST-Ram in a Falcon), then * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers * from/to alternative Ram. */ if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) && m68k_realnum_memory > 1) { atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); if (!atari_dma_buffer) { pr_err(PFX "can't allocate ST-RAM double buffer\n"); return -ENOMEM; } atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer); atari_dma_orig_addr = NULL; } instance = scsi_host_alloc(&atari_scsi_template, sizeof(struct NCR5380_hostdata)); if (!instance) { error = -ENOMEM; goto fail_alloc; } instance->irq = irq->start; host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP; host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; error = NCR5380_init(instance, host_flags); if (error) goto fail_init; if (IS_A_TT()) { error = request_irq(instance->irq, scsi_tt_intr, 0, "NCR5380", instance); if (error) { pr_err(PFX "request irq %d failed, aborting\n", instance->irq); goto fail_irq; } tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ tt_scsi_dma.dma_ctrl = 0; atari_dma_residual = 0; /* While the read overruns (described by Drew Eckhardt in * NCR5380.c) never happened on TTs, they do in fact on the * Medusa (This was the cause why SCSI didn't work right for * so long there.) Since handling the overruns slows down * a bit, I turned the #ifdef's into a runtime condition. * * In principle it should be sufficient to do max. 1 byte with * PIO, but there is another problem on the Medusa with the DMA * rest data register. So read_overruns is currently set * to 4 to avoid having transfers that aren't a multiple of 4. * If the rest data bug is fixed, this can be lowered to 1. */ if (MACH_IS_MEDUSA) { struct NCR5380_hostdata *hostdata = shost_priv(instance); hostdata->read_overruns = 4; } } else { /* Nothing to do for the interrupt: the ST-DMA is initialized * already. */ atari_dma_residual = 0; atari_dma_active = 0; atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000); } NCR5380_maybe_reset_bus(instance); error = scsi_add_host(instance, NULL); if (error) goto fail_host; platform_set_drvdata(pdev, instance); scsi_scan_host(instance); return 0; fail_host: if (IS_A_TT()) free_irq(instance->irq, instance); fail_irq: NCR5380_exit(instance); fail_init: scsi_host_put(instance); fail_alloc: if (atari_dma_buffer) atari_stram_free(atari_dma_buffer); return error; } static int __exit atari_scsi_remove(struct platform_device *pdev) { struct Scsi_Host *instance = platform_get_drvdata(pdev); scsi_remove_host(instance); if (IS_A_TT()) free_irq(instance->irq, instance); NCR5380_exit(instance); scsi_host_put(instance); if (atari_dma_buffer) atari_stram_free(atari_dma_buffer); return 0; } static struct platform_driver atari_scsi_driver = { .remove = __exit_p(atari_scsi_remove), .driver = { .name = DRV_MODULE_NAME, }, }; module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe); MODULE_ALIAS("platform:" DRV_MODULE_NAME); MODULE_LICENSE("GPL");
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