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/* 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 dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
size_t sz, int dir)
{
return dma_map_single(esp->dev, buf, sz, dir);
}
static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
int num_sg, int dir)
{
return dma_map_sg(esp->dev, sg, num_sg, dir);
}
static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
size_t sz, int dir)
{
dma_unmap_single(esp->dev, addr, sz, dir);
}
static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
int num_sg, int dir)
{
dma_unmap_sg(esp->dev, sg, num_sg, dir);
}
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,
.map_single = jazz_esp_map_single,
.map_sg = jazz_esp_map_sg,
.unmap_single = jazz_esp_unmap_single,
.unmap_sg = jazz_esp_unmap_sg,
.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;
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 = platform_get_irq(dev, 0);
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, &dev->dev);
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",
},
};
static int __init jazz_esp_init(void)
{
return platform_driver_register(&esp_jazz_driver);
}
static void __exit jazz_esp_exit(void)
{
platform_driver_unregister(&esp_jazz_driver);
}
MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
module_init(jazz_esp_init);
module_exit(jazz_esp_exit);
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