diff options
Diffstat (limited to 'drivers/scsi/jazz_esp.c')
| -rw-r--r-- | drivers/scsi/jazz_esp.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/scsi/jazz_esp.c b/drivers/scsi/jazz_esp.c new file mode 100644 index 000000000..60a88a95a --- /dev/null +++ b/drivers/scsi/jazz_esp.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* jazz_esp.c: ESP front-end for MIPS JAZZ systems. + * + * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende) + */ + +#include <linux/kernel.h> +#include <linux/gfp.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> + +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/dma.h> + +#include <asm/jazz.h> +#include <asm/jazzdma.h> + +#include <scsi/scsi_host.h> + +#include "esp_scsi.h" + +#define DRV_MODULE_NAME "jazz_esp" +#define PFX DRV_MODULE_NAME ": " +#define DRV_VERSION "1.000" +#define DRV_MODULE_RELDATE "May 19, 2007" + +static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg) +{ + *(volatile u8 *)(esp->regs + reg) = val; +} + +static u8 jazz_esp_read8(struct esp *esp, unsigned long reg) +{ + return *(volatile u8 *)(esp->regs + reg); +} + +static int jazz_esp_irq_pending(struct esp *esp) +{ + if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) + return 1; + return 0; +} + +static void jazz_esp_reset_dma(struct esp *esp) +{ + vdma_disable ((int)esp->dma_regs); +} + +static void jazz_esp_dma_drain(struct esp *esp) +{ + /* nothing to do */ +} + +static void jazz_esp_dma_invalidate(struct esp *esp) +{ + vdma_disable ((int)esp->dma_regs); +} + +static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, + u32 dma_count, int write, u8 cmd) +{ + BUG_ON(!(cmd & ESP_CMD_DMA)); + + jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW); + jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED); + vdma_disable ((int)esp->dma_regs); + if (write) + vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ); + else + vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE); + + vdma_set_addr ((int)esp->dma_regs, addr); + vdma_set_count ((int)esp->dma_regs, dma_count); + vdma_enable ((int)esp->dma_regs); + + scsi_esp_cmd(esp, cmd); +} + +static int jazz_esp_dma_error(struct esp *esp) +{ + u32 enable = vdma_get_enable((int)esp->dma_regs); + + if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR)) + return 1; + + return 0; +} + +static const struct esp_driver_ops jazz_esp_ops = { + .esp_write8 = jazz_esp_write8, + .esp_read8 = jazz_esp_read8, + .irq_pending = jazz_esp_irq_pending, + .reset_dma = jazz_esp_reset_dma, + .dma_drain = jazz_esp_dma_drain, + .dma_invalidate = jazz_esp_dma_invalidate, + .send_dma_cmd = jazz_esp_send_dma_cmd, + .dma_error = jazz_esp_dma_error, +}; + +static int esp_jazz_probe(struct platform_device *dev) +{ + struct scsi_host_template *tpnt = &scsi_esp_template; + struct Scsi_Host *host; + struct esp *esp; + struct resource *res; + int err; + + host = scsi_host_alloc(tpnt, sizeof(struct esp)); + + err = -ENOMEM; + if (!host) + goto fail; + + host->max_id = 8; + esp = shost_priv(host); + + esp->host = host; + esp->dev = &dev->dev; + esp->ops = &jazz_esp_ops; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + goto fail_unlink; + + esp->regs = (void __iomem *)res->start; + if (!esp->regs) + goto fail_unlink; + + res = platform_get_resource(dev, IORESOURCE_MEM, 1); + if (!res) + goto fail_unlink; + + esp->dma_regs = (void __iomem *)res->start; + + esp->command_block = dma_alloc_coherent(esp->dev, 16, + &esp->command_block_dma, + GFP_KERNEL); + if (!esp->command_block) + goto fail_unmap_regs; + + host->irq = err = platform_get_irq(dev, 0); + if (err < 0) + goto fail_unmap_command_block; + err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp); + if (err < 0) + goto fail_unmap_command_block; + + esp->scsi_id = 7; + esp->host->this_id = esp->scsi_id; + esp->scsi_id_mask = (1 << esp->scsi_id); + esp->cfreq = 40000000; + + dev_set_drvdata(&dev->dev, esp); + + err = scsi_esp_register(esp); + if (err) + goto fail_free_irq; + + return 0; + +fail_free_irq: + free_irq(host->irq, esp); +fail_unmap_command_block: + dma_free_coherent(esp->dev, 16, + esp->command_block, + esp->command_block_dma); +fail_unmap_regs: +fail_unlink: + scsi_host_put(host); +fail: + return err; +} + +static int esp_jazz_remove(struct platform_device *dev) +{ + struct esp *esp = dev_get_drvdata(&dev->dev); + unsigned int irq = esp->host->irq; + + scsi_esp_unregister(esp); + + free_irq(irq, esp); + dma_free_coherent(esp->dev, 16, + esp->command_block, + esp->command_block_dma); + + scsi_host_put(esp->host); + + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:jazz_esp"); + +static struct platform_driver esp_jazz_driver = { + .probe = esp_jazz_probe, + .remove = esp_jazz_remove, + .driver = { + .name = "jazz_esp", + }, +}; +module_platform_driver(esp_jazz_driver); + +MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); +MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); |