1 // SPDX-License-Identifier: GPL-2.0-only 2 /* jazz_esp.c: ESP front-end for MIPS JAZZ systems. 3 * 4 * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende) 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/gfp.h> 9 #include <linux/types.h> 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/platform_device.h> 14 #include <linux/dma-mapping.h> 15 16 #include <asm/irq.h> 17 #include <asm/io.h> 18 #include <asm/dma.h> 19 20 #include <asm/jazz.h> 21 #include <asm/jazzdma.h> 22 23 #include <scsi/scsi_host.h> 24 25 #include "esp_scsi.h" 26 27 #define DRV_MODULE_NAME "jazz_esp" 28 #define PFX DRV_MODULE_NAME ": " 29 #define DRV_VERSION "1.000" 30 #define DRV_MODULE_RELDATE "May 19, 2007" 31 32 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg) 33 { 34 *(volatile u8 *)(esp->regs + reg) = val; 35 } 36 37 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg) 38 { 39 return *(volatile u8 *)(esp->regs + reg); 40 } 41 42 static int jazz_esp_irq_pending(struct esp *esp) 43 { 44 if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) 45 return 1; 46 return 0; 47 } 48 49 static void jazz_esp_reset_dma(struct esp *esp) 50 { 51 vdma_disable ((int)esp->dma_regs); 52 } 53 54 static void jazz_esp_dma_drain(struct esp *esp) 55 { 56 /* nothing to do */ 57 } 58 59 static void jazz_esp_dma_invalidate(struct esp *esp) 60 { 61 vdma_disable ((int)esp->dma_regs); 62 } 63 64 static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, 65 u32 dma_count, int write, u8 cmd) 66 { 67 BUG_ON(!(cmd & ESP_CMD_DMA)); 68 69 jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW); 70 jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED); 71 vdma_disable ((int)esp->dma_regs); 72 if (write) 73 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ); 74 else 75 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE); 76 77 vdma_set_addr ((int)esp->dma_regs, addr); 78 vdma_set_count ((int)esp->dma_regs, dma_count); 79 vdma_enable ((int)esp->dma_regs); 80 81 scsi_esp_cmd(esp, cmd); 82 } 83 84 static int jazz_esp_dma_error(struct esp *esp) 85 { 86 u32 enable = vdma_get_enable((int)esp->dma_regs); 87 88 if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR)) 89 return 1; 90 91 return 0; 92 } 93 94 static const struct esp_driver_ops jazz_esp_ops = { 95 .esp_write8 = jazz_esp_write8, 96 .esp_read8 = jazz_esp_read8, 97 .irq_pending = jazz_esp_irq_pending, 98 .reset_dma = jazz_esp_reset_dma, 99 .dma_drain = jazz_esp_dma_drain, 100 .dma_invalidate = jazz_esp_dma_invalidate, 101 .send_dma_cmd = jazz_esp_send_dma_cmd, 102 .dma_error = jazz_esp_dma_error, 103 }; 104 105 static int esp_jazz_probe(struct platform_device *dev) 106 { 107 const struct scsi_host_template *tpnt = &scsi_esp_template; 108 struct Scsi_Host *host; 109 struct esp *esp; 110 struct resource *res; 111 int err; 112 113 host = scsi_host_alloc(tpnt, sizeof(struct esp)); 114 115 err = -ENOMEM; 116 if (!host) 117 goto fail; 118 119 host->max_id = 8; 120 esp = shost_priv(host); 121 122 esp->host = host; 123 esp->dev = &dev->dev; 124 esp->ops = &jazz_esp_ops; 125 126 res = platform_get_resource(dev, IORESOURCE_MEM, 0); 127 if (!res) 128 goto fail_unlink; 129 130 esp->regs = (void __iomem *)res->start; 131 if (!esp->regs) 132 goto fail_unlink; 133 134 res = platform_get_resource(dev, IORESOURCE_MEM, 1); 135 if (!res) 136 goto fail_unlink; 137 138 esp->dma_regs = (void __iomem *)res->start; 139 140 esp->command_block = dma_alloc_coherent(esp->dev, 16, 141 &esp->command_block_dma, 142 GFP_KERNEL); 143 if (!esp->command_block) 144 goto fail_unmap_regs; 145 146 host->irq = err = platform_get_irq(dev, 0); 147 if (err < 0) 148 goto fail_unmap_command_block; 149 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp); 150 if (err < 0) 151 goto fail_unmap_command_block; 152 153 esp->scsi_id = 7; 154 esp->host->this_id = esp->scsi_id; 155 esp->scsi_id_mask = (1 << esp->scsi_id); 156 esp->cfreq = 40000000; 157 158 dev_set_drvdata(&dev->dev, esp); 159 160 err = scsi_esp_register(esp); 161 if (err) 162 goto fail_free_irq; 163 164 return 0; 165 166 fail_free_irq: 167 free_irq(host->irq, esp); 168 fail_unmap_command_block: 169 dma_free_coherent(esp->dev, 16, 170 esp->command_block, 171 esp->command_block_dma); 172 fail_unmap_regs: 173 fail_unlink: 174 scsi_host_put(host); 175 fail: 176 return err; 177 } 178 179 static int esp_jazz_remove(struct platform_device *dev) 180 { 181 struct esp *esp = dev_get_drvdata(&dev->dev); 182 unsigned int irq = esp->host->irq; 183 184 scsi_esp_unregister(esp); 185 186 free_irq(irq, esp); 187 dma_free_coherent(esp->dev, 16, 188 esp->command_block, 189 esp->command_block_dma); 190 191 scsi_host_put(esp->host); 192 193 return 0; 194 } 195 196 /* work with hotplug and coldplug */ 197 MODULE_ALIAS("platform:jazz_esp"); 198 199 static struct platform_driver esp_jazz_driver = { 200 .probe = esp_jazz_probe, 201 .remove = esp_jazz_remove, 202 .driver = { 203 .name = "jazz_esp", 204 }, 205 }; 206 module_platform_driver(esp_jazz_driver); 207 208 MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); 209 MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); 210 MODULE_LICENSE("GPL"); 211 MODULE_VERSION(DRV_VERSION); 212