Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 1 | /* jazz_esp.c: ESP front-end for MIPS JAZZ systems. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 3 | * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/types.h> |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/platform_device.h> |
| 12 | #include <linux/dma-mapping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | #include <asm/irq.h> |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 15 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <asm/dma.h> |
| 17 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 18 | #include <asm/jazz.h> |
| 19 | #include <asm/jazzdma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 21 | #include <scsi/scsi_host.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 23 | #include "esp_scsi.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 25 | #define DRV_MODULE_NAME "jazz_esp" |
| 26 | #define PFX DRV_MODULE_NAME ": " |
| 27 | #define DRV_VERSION "1.000" |
| 28 | #define DRV_MODULE_RELDATE "May 19, 2007" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 30 | static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 32 | *(volatile u8 *)(esp->regs + reg) = val; |
| 33 | } |
| 34 | |
| 35 | static u8 jazz_esp_read8(struct esp *esp, unsigned long reg) |
| 36 | { |
| 37 | return *(volatile u8 *)(esp->regs + reg); |
| 38 | } |
| 39 | |
| 40 | static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf, |
| 41 | size_t sz, int dir) |
| 42 | { |
| 43 | return dma_map_single(esp->dev, buf, sz, dir); |
| 44 | } |
| 45 | |
| 46 | static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg, |
| 47 | int num_sg, int dir) |
| 48 | { |
| 49 | return dma_map_sg(esp->dev, sg, num_sg, dir); |
| 50 | } |
| 51 | |
| 52 | static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr, |
| 53 | size_t sz, int dir) |
| 54 | { |
| 55 | dma_unmap_single(esp->dev, addr, sz, dir); |
| 56 | } |
| 57 | |
| 58 | static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg, |
| 59 | int num_sg, int dir) |
| 60 | { |
| 61 | dma_unmap_sg(esp->dev, sg, num_sg, dir); |
| 62 | } |
| 63 | |
| 64 | static int jazz_esp_irq_pending(struct esp *esp) |
| 65 | { |
| 66 | if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) |
| 67 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | return 0; |
| 69 | } |
| 70 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 71 | static void jazz_esp_reset_dma(struct esp *esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 73 | vdma_disable ((int)esp->dma_regs); |
| 74 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 76 | static void jazz_esp_dma_drain(struct esp *esp) |
| 77 | { |
| 78 | /* nothing to do */ |
| 79 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 81 | static void jazz_esp_dma_invalidate(struct esp *esp) |
| 82 | { |
| 83 | vdma_disable ((int)esp->dma_regs); |
| 84 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 86 | static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, |
| 87 | u32 dma_count, int write, u8 cmd) |
| 88 | { |
| 89 | BUG_ON(!(cmd & ESP_CMD_DMA)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 91 | jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW); |
| 92 | jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED); |
| 93 | vdma_disable ((int)esp->dma_regs); |
| 94 | if (write) |
| 95 | vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ); |
| 96 | else |
| 97 | vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE); |
| 98 | |
| 99 | vdma_set_addr ((int)esp->dma_regs, addr); |
| 100 | vdma_set_count ((int)esp->dma_regs, dma_count); |
| 101 | vdma_enable ((int)esp->dma_regs); |
| 102 | |
| 103 | scsi_esp_cmd(esp, cmd); |
| 104 | } |
| 105 | |
| 106 | static int jazz_esp_dma_error(struct esp *esp) |
| 107 | { |
| 108 | u32 enable = vdma_get_enable((int)esp->dma_regs); |
| 109 | |
| 110 | if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR)) |
| 111 | return 1; |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static const struct esp_driver_ops jazz_esp_ops = { |
| 117 | .esp_write8 = jazz_esp_write8, |
| 118 | .esp_read8 = jazz_esp_read8, |
| 119 | .map_single = jazz_esp_map_single, |
| 120 | .map_sg = jazz_esp_map_sg, |
| 121 | .unmap_single = jazz_esp_unmap_single, |
| 122 | .unmap_sg = jazz_esp_unmap_sg, |
| 123 | .irq_pending = jazz_esp_irq_pending, |
| 124 | .reset_dma = jazz_esp_reset_dma, |
| 125 | .dma_drain = jazz_esp_dma_drain, |
| 126 | .dma_invalidate = jazz_esp_dma_invalidate, |
| 127 | .send_dma_cmd = jazz_esp_send_dma_cmd, |
| 128 | .dma_error = jazz_esp_dma_error, |
| 129 | }; |
| 130 | |
| 131 | static int __devinit esp_jazz_probe(struct platform_device *dev) |
| 132 | { |
| 133 | struct scsi_host_template *tpnt = &scsi_esp_template; |
| 134 | struct Scsi_Host *host; |
| 135 | struct esp *esp; |
| 136 | struct resource *res; |
| 137 | int err; |
| 138 | |
| 139 | host = scsi_host_alloc(tpnt, sizeof(struct esp)); |
| 140 | |
| 141 | err = -ENOMEM; |
| 142 | if (!host) |
| 143 | goto fail; |
| 144 | |
| 145 | host->max_id = 8; |
Christoph Hellwig | 2b14ec7 | 2007-05-31 20:12:32 +0200 | [diff] [blame] | 146 | esp = shost_priv(host); |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 147 | |
| 148 | esp->host = host; |
| 149 | esp->dev = dev; |
| 150 | esp->ops = &jazz_esp_ops; |
| 151 | |
| 152 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 153 | if (!res) |
| 154 | goto fail_unlink; |
| 155 | |
| 156 | esp->regs = (void __iomem *)res->start; |
| 157 | if (!esp->regs) |
| 158 | goto fail_unlink; |
| 159 | |
| 160 | res = platform_get_resource(dev, IORESOURCE_MEM, 1); |
| 161 | if (!res) |
| 162 | goto fail_unlink; |
| 163 | |
| 164 | esp->dma_regs = (void __iomem *)res->start; |
| 165 | |
| 166 | esp->command_block = dma_alloc_coherent(esp->dev, 16, |
| 167 | &esp->command_block_dma, |
| 168 | GFP_KERNEL); |
| 169 | if (!esp->command_block) |
| 170 | goto fail_unmap_regs; |
| 171 | |
| 172 | host->irq = platform_get_irq(dev, 0); |
| 173 | err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp); |
| 174 | if (err < 0) |
| 175 | goto fail_unmap_command_block; |
| 176 | |
| 177 | esp->scsi_id = 7; |
| 178 | esp->host->this_id = esp->scsi_id; |
| 179 | esp->scsi_id_mask = (1 << esp->scsi_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | esp->cfreq = 40000000; |
| 181 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 182 | dev_set_drvdata(&dev->dev, esp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 184 | err = scsi_esp_register(esp, &dev->dev); |
| 185 | if (err) |
| 186 | goto fail_free_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 188 | return 0; |
| 189 | |
| 190 | fail_free_irq: |
| 191 | free_irq(host->irq, esp); |
| 192 | fail_unmap_command_block: |
| 193 | dma_free_coherent(esp->dev, 16, |
| 194 | esp->command_block, |
| 195 | esp->command_block_dma); |
| 196 | fail_unmap_regs: |
| 197 | fail_unlink: |
| 198 | scsi_host_put(host); |
| 199 | fail: |
| 200 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 203 | static int __devexit esp_jazz_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 205 | struct esp *esp = dev_get_drvdata(&dev->dev); |
| 206 | unsigned int irq = esp->host->irq; |
| 207 | |
| 208 | scsi_esp_unregister(esp); |
| 209 | |
| 210 | free_irq(irq, esp); |
| 211 | dma_free_coherent(esp->dev, 16, |
| 212 | esp->command_block, |
| 213 | esp->command_block_dma); |
| 214 | |
| 215 | scsi_host_put(esp->host); |
| 216 | |
| 217 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
Kay Sievers | ecc1241 | 2008-04-18 13:57:19 -0700 | [diff] [blame^] | 220 | /* work with hotplug and coldplug */ |
| 221 | MODULE_ALIAS("platform:jazz_esp"); |
| 222 | |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 223 | static struct platform_driver esp_jazz_driver = { |
| 224 | .probe = esp_jazz_probe, |
| 225 | .remove = __devexit_p(esp_jazz_remove), |
| 226 | .driver = { |
| 227 | .name = "jazz_esp", |
Kay Sievers | ecc1241 | 2008-04-18 13:57:19 -0700 | [diff] [blame^] | 228 | .owner = THIS_MODULE, |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 229 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | }; |
Thomas Bogendoerfer | 352e921 | 2007-05-22 10:13:19 +0200 | [diff] [blame] | 231 | |
| 232 | static int __init jazz_esp_init(void) |
| 233 | { |
| 234 | return platform_driver_register(&esp_jazz_driver); |
| 235 | } |
| 236 | |
| 237 | static void __exit jazz_esp_exit(void) |
| 238 | { |
| 239 | platform_driver_unregister(&esp_jazz_driver); |
| 240 | } |
| 241 | |
| 242 | MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); |
| 243 | MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); |
| 244 | MODULE_LICENSE("GPL"); |
| 245 | MODULE_VERSION(DRV_VERSION); |
| 246 | |
| 247 | module_init(jazz_esp_init); |
| 248 | module_exit(jazz_esp_exit); |