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