1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) 7 * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) 8 * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org) 9 * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org) 10 * 11 * (In all truth, Jed Schimmel wrote all this code.) 12 */ 13 14#undef DEBUG 15 16#include <linux/delay.h> 17#include <linux/dma-mapping.h> 18#include <linux/gfp.h> 19#include <linux/interrupt.h> 20#include <linux/init.h> 21#include <linux/kernel.h> 22#include <linux/types.h> 23#include <linux/module.h> 24#include <linux/platform_device.h> 25#include <linux/spinlock.h> 26 27#include <asm/sgi/hpc3.h> 28#include <asm/sgi/ip22.h> 29#include <asm/sgi/wd.h> 30 31#include "scsi.h" 32#include "wd33c93.h" 33 34struct ip22_hostdata { 35 struct WD33C93_hostdata wh; 36 dma_addr_t dma; 37 void *cpu; 38 struct device *dev; 39}; 40 41#define host_to_hostdata(host) ((struct ip22_hostdata *)((host)->hostdata)) 42 43struct hpc_chunk { 44 struct hpc_dma_desc desc; 45 u32 _padding; /* align to quadword boundary */ 46}; 47 48/* space for hpc dma descriptors */ 49#define HPC_DMA_SIZE PAGE_SIZE 50 51#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 52 53static irqreturn_t sgiwd93_intr(int irq, void *dev_id) 54{ 55 struct Scsi_Host * host = dev_id; 56 unsigned long flags; 57 58 spin_lock_irqsave(host->host_lock, flags); 59 wd33c93_intr(host); 60 spin_unlock_irqrestore(host->host_lock, flags); 61 62 return IRQ_HANDLED; 63} 64 65static inline 66void fill_hpc_entries(struct ip22_hostdata *hd, struct scsi_cmnd *cmd, int din) 67{ 68 unsigned long len = cmd->SCp.this_residual; 69 void *addr = cmd->SCp.ptr; 70 dma_addr_t physaddr; 71 unsigned long count; 72 struct hpc_chunk *hcp; 73 74 physaddr = dma_map_single(hd->dev, addr, len, DMA_DIR(din)); 75 cmd->SCp.dma_handle = physaddr; 76 hcp = hd->cpu; 77 78 while (len) { 79 /* 80 * even cntinfo could be up to 16383, without 81 * magic only 8192 works correctly 82 */ 83 count = len > 8192 ? 8192 : len; 84 hcp->desc.pbuf = physaddr; 85 hcp->desc.cntinfo = count; 86 hcp++; 87 len -= count; 88 physaddr += count; 89 } 90 91 /* 92 * To make sure, if we trip an HPC bug, that we transfer every single 93 * byte, we tag on an extra zero length dma descriptor at the end of 94 * the chain. 95 */ 96 hcp->desc.pbuf = 0; 97 hcp->desc.cntinfo = HPCDMA_EOX; 98 dma_cache_sync(hd->dev, hd->cpu, 99 (unsigned long)(hcp + 1) - (unsigned long)hd->cpu, 100 DMA_TO_DEVICE); 101} 102 103static int dma_setup(struct scsi_cmnd *cmd, int datainp) 104{ 105 struct ip22_hostdata *hdata = host_to_hostdata(cmd->device->host); 106 struct hpc3_scsiregs *hregs = 107 (struct hpc3_scsiregs *) cmd->device->host->base; 108 109 pr_debug("dma_setup: datainp<%d> hcp<%p> ", datainp, hdata->cpu); 110 111 hdata->wh.dma_dir = datainp; 112 113 /* 114 * wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The 115 * other wd33c93 drivers deal with it the same way (which isn't that 116 * obvious). IMHO a better fix would be, not to do these dma setups 117 * in the first place. 118 */ 119 if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0) 120 return 1; 121 122 fill_hpc_entries(hdata, cmd, datainp); 123 124 pr_debug(" HPCGO\n"); 125 126 /* Start up the HPC. */ 127 hregs->ndptr = hdata->dma; 128 if (datainp) 129 hregs->ctrl = HPC3_SCTRL_ACTIVE; 130 else 131 hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR; 132 133 return 0; 134} 135 136static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 137 int status) 138{ 139 struct ip22_hostdata *hdata = host_to_hostdata(instance); 140 struct hpc3_scsiregs *hregs; 141 142 if (!SCpnt) 143 return; 144 145 if (SCpnt->SCp.ptr == NULL || SCpnt->SCp.this_residual == 0) 146 return; 147 148 hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base; 149 150 pr_debug("dma_stop: status<%d> ", status); 151 152 /* First stop the HPC and flush it's FIFO. */ 153 if (hdata->wh.dma_dir) { 154 hregs->ctrl |= HPC3_SCTRL_FLUSH; 155 while (hregs->ctrl & HPC3_SCTRL_ACTIVE) 156 barrier(); 157 } 158 hregs->ctrl = 0; 159 dma_unmap_single(hdata->dev, SCpnt->SCp.dma_handle, 160 SCpnt->SCp.this_residual, 161 DMA_DIR(hdata->wh.dma_dir)); 162 163 pr_debug("\n"); 164} 165 166void sgiwd93_reset(unsigned long base) 167{ 168 struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base; 169 170 hregs->ctrl = HPC3_SCTRL_CRESET; 171 udelay(50); 172 hregs->ctrl = 0; 173} 174EXPORT_SYMBOL_GPL(sgiwd93_reset); 175 176static inline void init_hpc_chain(struct ip22_hostdata *hdata) 177{ 178 struct hpc_chunk *hcp = (struct hpc_chunk *)hdata->cpu; 179 dma_addr_t dma = hdata->dma; 180 unsigned long start, end; 181 182 start = (unsigned long) hcp; 183 end = start + HPC_DMA_SIZE; 184 while (start < end) { 185 hcp->desc.pnext = (u32) (dma + sizeof(struct hpc_chunk)); 186 hcp->desc.cntinfo = HPCDMA_EOX; 187 hcp++; 188 dma += sizeof(struct hpc_chunk); 189 start += sizeof(struct hpc_chunk); 190 }; 191 hcp--; 192 hcp->desc.pnext = hdata->dma; 193} 194 195static int sgiwd93_bus_reset(struct scsi_cmnd *cmd) 196{ 197 198 199 spin_lock_irq(cmd->device->host->host_lock); 200 wd33c93_host_reset(cmd); 201 spin_unlock_irq(cmd->device->host->host_lock); 202 203 return SUCCESS; 204} 205 206/* 207 * Kludge alert - the SCSI code calls the abort and reset method with int 208 * arguments not with pointers. So this is going to blow up beautyfully 209 * on 64-bit systems with memory outside the compat address spaces. 210 */ 211static struct scsi_host_template sgiwd93_template = { 212 .module = THIS_MODULE, 213 .proc_name = "SGIWD93", 214 .name = "SGI WD93", 215 .queuecommand = wd33c93_queuecommand, 216 .eh_abort_handler = wd33c93_abort, 217 .eh_bus_reset_handler = sgiwd93_bus_reset, 218 .eh_host_reset_handler = wd33c93_host_reset, 219 .can_queue = 16, 220 .this_id = 7, 221 .sg_tablesize = SG_ALL, 222 .cmd_per_lun = 8, 223 .use_clustering = DISABLE_CLUSTERING, 224}; 225 226static int __devinit sgiwd93_probe(struct platform_device *pdev) 227{ 228 struct sgiwd93_platform_data *pd = pdev->dev.platform_data; 229 unsigned char *wdregs = pd->wdregs; 230 struct hpc3_scsiregs *hregs = pd->hregs; 231 struct ip22_hostdata *hdata; 232 struct Scsi_Host *host; 233 wd33c93_regs regs; 234 unsigned int unit = pd->unit; 235 unsigned int irq = pd->irq; 236 int err; 237 238 host = scsi_host_alloc(&sgiwd93_template, sizeof(struct ip22_hostdata)); 239 if (!host) { 240 err = -ENOMEM; 241 goto out; 242 } 243 244 host->base = (unsigned long) hregs; 245 host->irq = irq; 246 247 hdata = host_to_hostdata(host); 248 hdata->dev = &pdev->dev; 249 hdata->cpu = dma_alloc_noncoherent(&pdev->dev, HPC_DMA_SIZE, 250 &hdata->dma, GFP_KERNEL); 251 if (!hdata->cpu) { 252 printk(KERN_WARNING "sgiwd93: Could not allocate memory for " 253 "host %d buffer.\n", unit); 254 err = -ENOMEM; 255 goto out_put; 256 } 257 258 init_hpc_chain(hdata); 259 260 regs.SASR = wdregs + 3; 261 regs.SCMD = wdregs + 7; 262 263 hdata->wh.no_sync = 0; 264 hdata->wh.fast = 1; 265 hdata->wh.dma_mode = CTRL_BURST; 266 267 wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_MHZ(20)); 268 269 err = request_irq(irq, sgiwd93_intr, 0, "SGI WD93", host); 270 if (err) { 271 printk(KERN_WARNING "sgiwd93: Could not register irq %d " 272 "for host %d.\n", irq, unit); 273 goto out_free; 274 } 275 276 platform_set_drvdata(pdev, host); 277 278 err = scsi_add_host(host, NULL); 279 if (err) 280 goto out_irq; 281 282 scsi_scan_host(host); 283 284 return 0; 285 286out_irq: 287 free_irq(irq, host); 288out_free: 289 dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma); 290out_put: 291 scsi_host_put(host); 292out: 293 294 return err; 295} 296 297static int __exit sgiwd93_remove(struct platform_device *pdev) 298{ 299 struct Scsi_Host *host = platform_get_drvdata(pdev); 300 struct ip22_hostdata *hdata = (struct ip22_hostdata *) host->hostdata; 301 struct sgiwd93_platform_data *pd = pdev->dev.platform_data; 302 303 scsi_remove_host(host); 304 free_irq(pd->irq, host); 305 dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma); 306 scsi_host_put(host); 307 return 0; 308} 309 310static struct platform_driver sgiwd93_driver = { 311 .probe = sgiwd93_probe, 312 .remove = __devexit_p(sgiwd93_remove), 313 .driver = { 314 .name = "sgiwd93", 315 .owner = THIS_MODULE, 316 } 317}; 318 319static int __init sgiwd93_module_init(void) 320{ 321 return platform_driver_register(&sgiwd93_driver); 322} 323 324static void __exit sgiwd93_module_exit(void) 325{ 326 return platform_driver_unregister(&sgiwd93_driver); 327} 328 329module_init(sgiwd93_module_init); 330module_exit(sgiwd93_module_exit); 331 332MODULE_DESCRIPTION("SGI WD33C93 driver"); 333MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); 334MODULE_LICENSE("GPL"); 335MODULE_ALIAS("platform:sgiwd93"); 336