Release 4.7 drivers/scsi/mac_esp.c

Directory: drivers/scsi
/* mac_esp.c: ESP front-end for Macintosh Quadra systems.
 *
 * Adapted from jazz_esp.c and the old mac_esp.c.
 *
 * The pseudo DMA algorithm is based on the one used in NetBSD.
 * See sys/arch/mac68k/obio/esp.c for some background information.
 *
 * Copyright (C) 2007-2008 Finn Thain
 */

#include <linux/kernel.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 <linux/scatterlist.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/nubus.h>
#include <linux/slab.h>

#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/macints.h>
#include <asm/macintosh.h>
#include <asm/mac_via.h>

#include <scsi/scsi_host.h>

#include "esp_scsi.h"


#define DRV_MODULE_NAME     "mac_esp"

#define PFX                 DRV_MODULE_NAME ": "

#define DRV_VERSION         "1.000"

#define DRV_MODULE_RELDATE  "Sept 15, 2007"


#define MAC_ESP_IO_BASE          0x50F00000

#define MAC_ESP_REGS_QUADRA      (MAC_ESP_IO_BASE + 0x10000)

#define MAC_ESP_REGS_QUADRA2     (MAC_ESP_IO_BASE + 0xF000)

#define MAC_ESP_REGS_QUADRA3     (MAC_ESP_IO_BASE + 0x18000)

#define MAC_ESP_REGS_SPACING     0x402

#define MAC_ESP_PDMA_REG         0xF9800024

#define MAC_ESP_PDMA_REG_SPACING 0x4

#define MAC_ESP_PDMA_IO_OFFSET   0x100


#define esp_read8(REG)		mac_esp_read8(esp, REG)

#define esp_write8(VAL, REG)	mac_esp_write8(esp, VAL, REG)


struct mac_esp_priv {
	
struct esp *esp;
	
void __iomem *pdma_regs;
	
void __iomem *pdma_io;
	
int error;
};

static struct esp *esp_chips[2];


#define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
                               platform_get_drvdata((struct platform_device *) \
                                                    (esp->dev)))



static inline void mac_esp_write8(struct esp *esp, u8 val, unsigned long reg)
{
	nubus_writeb(val, esp->regs + reg * 16);
}

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static inline u8 mac_esp_read8(struct esp *esp, unsigned long reg)
{
	return nubus_readb(esp->regs + reg * 16);
}

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/* For pseudo DMA and PIO we need the virtual address
 * so this address mapping is the identity mapping.
 */



static dma_addr_t mac_esp_map_single(struct esp *esp, void *buf,
				     size_t sz, int dir)
{
	return (dma_addr_t)buf;
}

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static int mac_esp_map_sg(struct esp *esp, struct scatterlist *sg,
			  int num_sg, int dir)
{
	int i;

	for (i = 0; i < num_sg; i++)
		sg[i].dma_address = (u32)sg_virt(&sg[i]);
	return num_sg;
}

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static void mac_esp_unmap_single(struct esp *esp, dma_addr_t addr,
				 size_t sz, int dir)
{
	/* Nothing to do. */
}

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static void mac_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
			     int num_sg, int dir)
{
	/* Nothing to do. */
}

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static void mac_esp_reset_dma(struct esp *esp)
{
	/* Nothing to do. */
}

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static void mac_esp_dma_drain(struct esp *esp)
{
	/* Nothing to do. */
}

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static void mac_esp_dma_invalidate(struct esp *esp)
{
	/* Nothing to do. */
}

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static int mac_esp_dma_error(struct esp *esp)
{
	return MAC_ESP_GET_PRIV(esp)->error;
}

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static inline int mac_esp_wait_for_empty_fifo(struct esp *esp)
{
	struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
	int i = 500000;

	do {
		if (!(esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES))
			return 0;

		if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
			return 1;

		udelay(2);
	} while (--i);

	printk(KERN_ERR PFX "FIFO is not empty (sreg %02x)\n",
	       esp_read8(ESP_STATUS));
	mep->error = 1;
	return 1;
}

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static inline int mac_esp_wait_for_dreq(struct esp *esp)
{
	struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
	int i = 500000;

	do {
		if (mep->pdma_regs == NULL) {
			if (via2_scsi_drq_pending())
				return 0;
		} else {
			if (nubus_readl(mep->pdma_regs) & 0x200)
				return 0;
		}

		if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
			return 1;

		udelay(2);
	} while (--i);

	printk(KERN_ERR PFX "PDMA timeout (sreg %02x)\n",
	       esp_read8(ESP_STATUS));
	mep->error = 1;
	return 1;
}

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#define MAC_ESP_PDMA_LOOP(operands) \
	asm volatile ( \
             "       tstw %1                   \n" \
             "       jbeq 20f                  \n" \
             "1:     movew " operands "        \n" \
             "2:     movew " operands "        \n" \
             "3:     movew " operands "        \n" \
             "4:     movew " operands "        \n" \
             "5:     movew " operands "        \n" \
             "6:     movew " operands "        \n" \
             "7:     movew " operands "        \n" \
             "8:     movew " operands "        \n" \
             "9:     movew " operands "        \n" \
             "10:    movew " operands "        \n" \
             "11:    movew " operands "        \n" \
             "12:    movew " operands "        \n" \
             "13:    movew " operands "        \n" \
             "14:    movew " operands "        \n" \
             "15:    movew " operands "        \n" \
             "16:    movew " operands "        \n" \
             "       subqw #1,%1               \n" \
             "       jbne 1b                   \n" \
             "20:    tstw %2                   \n" \
             "       jbeq 30f                  \n" \
             "21:    movew " operands "        \n" \
             "       subqw #1,%2               \n" \
             "       jbne 21b                  \n" \
             "30:    tstw %3                   \n" \
             "       jbeq 40f                  \n" \
             "31:    moveb " operands "        \n" \
             "32:    nop                       \n" \
             "40:                              \n" \
             "                                 \n" \
             "       .section __ex_table,\"a\" \n" \
             "       .align  4                 \n" \
             "       .long   1b,40b            \n" \
             "       .long   2b,40b            \n" \
             "       .long   3b,40b            \n" \
             "       .long   4b,40b            \n" \
             "       .long   5b,40b            \n" \
             "       .long   6b,40b            \n" \
             "       .long   7b,40b            \n" \
             "       .long   8b,40b            \n" \
             "       .long   9b,40b            \n" \
             "       .long  10b,40b            \n" \
             "       .long  11b,40b            \n" \
             "       .long  12b,40b            \n" \
             "       .long  13b,40b            \n" \
             "       .long  14b,40b            \n" \
             "       .long  15b,40b            \n" \
             "       .long  16b,40b            \n" \
             "       .long  21b,40b            \n" \
             "       .long  31b,40b            \n" \
             "       .long  32b,40b            \n" \
             "       .previous                 \n" \
             : "+a" (addr), "+r" (count32), "+r" (count2) \
             : "g" (count1), "a" (mep->pdma_io))



static void mac_esp_send_pdma_cmd(struct esp *esp, u32 addr, u32 esp_count,
				  u32 dma_count, int write, u8 cmd)
{
	struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);

	mep->error = 0;

	if (!write)
		scsi_esp_cmd(esp, ESP_CMD_FLUSH);

	esp_write8((esp_count >> 0) & 0xFF, ESP_TCLOW);
	esp_write8((esp_count >> 8) & 0xFF, ESP_TCMED);

	scsi_esp_cmd(esp, cmd);

	do {
		unsigned int count32 = esp_count >> 5;
		unsigned int count2 = (esp_count & 0x1F) >> 1;
		unsigned int count1 = esp_count & 1;
		unsigned int start_addr = addr;

		if (mac_esp_wait_for_dreq(esp))
			break;

		if (write) {
			MAC_ESP_PDMA_LOOP("%4@,%0@+");

			esp_count -= addr - start_addr;
		} else {
			unsigned int n;

			MAC_ESP_PDMA_LOOP("%0@+,%4@");

			if (mac_esp_wait_for_empty_fifo(esp))
				break;

			n = (esp_read8(ESP_TCMED) << 8) + esp_read8(ESP_TCLOW);
			addr = start_addr + esp_count - n;
			esp_count = n;
		}
	} while (esp_count);
}

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/*
 * Programmed IO routines follow.
 */



static inline unsigned int mac_esp_wait_for_fifo(struct esp *esp)
{
	int i = 500000;

	do {
		unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;

		if (fbytes)
			return fbytes;

		udelay(2);
	} while (--i);

	printk(KERN_ERR PFX "FIFO is empty (sreg %02x)\n",
	       esp_read8(ESP_STATUS));
	return 0;
}

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static inline int mac_esp_wait_for_intr(struct esp *esp)
{
	struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
	int i = 500000;

	do {
		esp->sreg = esp_read8(ESP_STATUS);
		if (esp->sreg & ESP_STAT_INTR)
			return 0;

		udelay(2);
	} while (--i);

	printk(KERN_ERR PFX "IRQ timeout (sreg %02x)\n", esp->sreg);
	mep->error = 1;
	return 1;
}

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#define MAC_ESP_PIO_LOOP(operands, reg1) \
	asm volatile ( \
             "1:     moveb " operands " \n" \
             "       subqw #1,%1        \n" \
             "       jbne 1b            \n" \
             : "+a" (addr), "+r" (reg1) \
             : "a" (fifo))


#define MAC_ESP_PIO_FILL(operands, reg1) \
	asm volatile ( \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       moveb " operands " \n" \
             "       subqw #8,%1        \n" \
             "       subqw #8,%1        \n" \
             : "+a" (addr), "+r" (reg1) \
             : "a" (fifo))


#define MAC_ESP_FIFO_SIZE 16



static void mac_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
				 u32 dma_count, int write, u8 cmd)
{
	struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
	u8 *fifo = esp->regs + ESP_FDATA * 16;

	cmd &= ~ESP_CMD_DMA;
	mep->error = 0;

	if (write) {
		scsi_esp_cmd(esp, cmd);

		while (1) {
			unsigned int n;

			n = mac_esp_wait_for_fifo(esp);
			if (!n)
				break;

			if (n > esp_count)
				n = esp_count;
			esp_count -= n;

			MAC_ESP_PIO_LOOP("%2@,%0@+", n);

			if (!esp_count)
				break;

			if (mac_esp_wait_for_intr(esp))
				break;

			if (((esp->sreg & ESP_STAT_PMASK) != ESP_DIP) &&
			    ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP))
				break;

			esp->ireg = esp_read8(ESP_INTRPT);
			if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
			    ESP_INTR_BSERV)
				break;

			scsi_esp_cmd(esp, ESP_CMD_TI);
		}
	} else {
		scsi_esp_cmd(esp, ESP_CMD_FLUSH);

		if (esp_count >= MAC_ESP_FIFO_SIZE)
			MAC_ESP_PIO_FILL("%0@+,%2@", esp_count);
		else
			MAC_ESP_PIO_LOOP("%0@+,%2@", esp_count);

		scsi_esp_cmd(esp, cmd);

		while (esp_count) {
			unsigned int n;

			if (mac_esp_wait_for_intr(esp))
				break;

			if (((esp->sreg & ESP_STAT_PMASK) != ESP_DOP) &&
			    ((esp->sreg & ESP_STAT_PMASK) != ESP_MOP))
				break;

			esp->ireg = esp_read8(ESP_INTRPT);
			if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
			    ESP_INTR_BSERV)
				break;

			n = MAC_ESP_FIFO_SIZE -
			    (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES);
			if (n > esp_count)
				n = esp_count;

			if (n == MAC_ESP_FIFO_SIZE) {
				MAC_ESP_PIO_FILL("%0@+,%2@", esp_count);
			} else {
				esp_count -= n;
				MAC_ESP_PIO_LOOP("%0@+,%2@", n);
			}

			scsi_esp_cmd(esp, ESP_CMD_TI);
		}
	}
}

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static int mac_esp_irq_pending(struct esp *esp)
{
	if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
		return 1;
	return 0;
}

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static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
{
	return dma_len > 0xFFFF ? 0xFFFF : dma_len;
}

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static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id)
{
	int got_intr;

	/*
         * This is an edge triggered IRQ, so we have to be careful to
         * avoid missing a transition when it is shared by two ESP devices.
         */

	do {
		got_intr = 0;
		if (esp_chips[0] &&
		    (mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) {
			(void)scsi_esp_intr(irq, esp_chips[0]);
			got_intr = 1;
		}
		if (esp_chips[1] &&
		    (mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) {
			(void)scsi_esp_intr(irq, esp_chips[1]);
			got_intr = 1;
		}
	} while (got_intr);

	return IRQ_HANDLED;
}

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static struct esp_driver_ops mac_esp_ops = {
	.esp_write8       = mac_esp_write8,
	.esp_read8        = mac_esp_read8,
	.map_single       = mac_esp_map_single,
	.map_sg           = mac_esp_map_sg,
	.unmap_single     = mac_esp_unmap_single,
	.unmap_sg         = mac_esp_unmap_sg,
	.irq_pending      = mac_esp_irq_pending,
	.dma_length_limit = mac_esp_dma_length_limit,
	.reset_dma        = mac_esp_reset_dma,
	.dma_drain        = mac_esp_dma_drain,
	.dma_invalidate   = mac_esp_dma_invalidate,
	.send_dma_cmd     = mac_esp_send_pdma_cmd,
	.dma_error        = mac_esp_dma_error,
};



static int esp_mac_probe(struct platform_device *dev)
{
	struct scsi_host_template *tpnt = &scsi_esp_template;
	struct Scsi_Host *host;
	struct esp *esp;
	int err;
	struct mac_esp_priv *mep;

	if (!MACH_IS_MAC)
		return -ENODEV;

	if (dev->id > 1)
		return -ENODEV;

	host = scsi_host_alloc(tpnt, sizeof(struct esp));

	err = -ENOMEM;
	if (!host)
		goto fail;

	host->max_id = 8;
	host->use_clustering = DISABLE_CLUSTERING;
	esp = shost_priv(host);

	esp->host = host;
	esp->dev = dev;

	esp->command_block = kzalloc(16, GFP_KERNEL);
	if (!esp->command_block)
		goto fail_unlink;
	esp->command_block_dma = (dma_addr_t)esp->command_block;

	esp->scsi_id = 7;
	host->this_id = esp->scsi_id;
	esp->scsi_id_mask = 1 << esp->scsi_id;

	mep = kzalloc(sizeof(struct mac_esp_priv), GFP_KERNEL);
	if (!mep)
		goto fail_free_command_block;
	mep->esp = esp;
	platform_set_drvdata(dev, mep);

	switch (macintosh_config->scsi_type) {
	case MAC_SCSI_QUADRA:
		esp->cfreq     = 16500000;
		esp->regs      = (void __iomem *)MAC_ESP_REGS_QUADRA;
		mep->pdma_io   = esp->regs + MAC_ESP_PDMA_IO_OFFSET;
		mep->pdma_regs = NULL;
		break;
	case MAC_SCSI_QUADRA2:
		esp->cfreq     = 25000000;
		esp->regs      = (void __iomem *)(MAC_ESP_REGS_QUADRA2 +
				 dev->id * MAC_ESP_REGS_SPACING);
		mep->pdma_io   = esp->regs + MAC_ESP_PDMA_IO_OFFSET;
		mep->pdma_regs = (void __iomem *)(MAC_ESP_PDMA_REG +
				 dev->id * MAC_ESP_PDMA_REG_SPACING);
		nubus_writel(0x1d1, mep->pdma_regs);
		break;
	case MAC_SCSI_QUADRA3:
		/* These quadras have a real DMA controller (the PSC) but we
                 * don't know how to drive it so we must use PIO instead.
                 */
		esp->cfreq     = 25000000;
		esp->regs      = (void __iomem *)MAC_ESP_REGS_QUADRA3;
		mep->pdma_io   = NULL;
		mep->pdma_regs = NULL;
		break;
	}

	esp->ops = &mac_esp_ops;
	if (mep->pdma_io == NULL) {
		printk(KERN_INFO PFX "using PIO for controller %d\n", dev->id);
		esp_write8(0, ESP_TCLOW);
		esp_write8(0, ESP_TCMED);
		esp->flags = ESP_FLAG_DISABLE_SYNC;
		mac_esp_ops.send_dma_cmd = mac_esp_send_pio_cmd;
	} else {
		printk(KERN_INFO PFX "using PDMA for controller %d\n", dev->id);
	}

	host->irq = IRQ_MAC_SCSI;
	esp_chips[dev->id] = esp;
	mb();
	if (esp_chips[!dev->id] == NULL) {
		err = request_irq(host->irq, mac_scsi_esp_intr, 0, "ESP", NULL);
		if (err < 0) {
			esp_chips[dev->id] = NULL;
			goto fail_free_priv;
		}
	}

	err = scsi_esp_register(esp, &dev->dev);
	if (err)
		goto fail_free_irq;

	return 0;

fail_free_irq:
	if (esp_chips[!dev->id] == NULL)
		free_irq(host->irq, esp);
fail_free_priv:
	kfree(mep);
fail_free_command_block:
	kfree(esp->command_block);
fail_unlink:
	scsi_host_put(host);
fail:
	return err;
}

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static int esp_mac_remove(struct platform_device *dev)
{
	struct mac_esp_priv *mep = platform_get_drvdata(dev);
	struct esp *esp = mep->esp;
	unsigned int irq = esp->host->irq;

	scsi_esp_unregister(esp);

	esp_chips[dev->id] = NULL;
	if (!(esp_chips[0] || esp_chips[1]))
		free_irq(irq, NULL);

	kfree(mep);

	kfree(esp->command_block);

	scsi_host_put(esp->host);

	return 0;
}

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static struct platform_driver esp_mac_driver = {
	.probe    = esp_mac_probe,
	.remove   = esp_mac_remove,
	.driver   = {
		.name	= DRV_MODULE_NAME,
        },
};



static int __init mac_esp_init(void)
{
	return platform_driver_register(&esp_mac_driver);
}

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static void __exit mac_esp_exit(void)
{
	platform_driver_unregister(&esp_mac_driver);
}

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finn thain finn thain 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%

MODULE_DESCRIPTION("Mac ESP SCSI driver");
MODULE_AUTHOR("Finn Thain <fthain@telegraphics.com.au>");
MODULE_LICENSE("GPL v2");

MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_MODULE_NAME);


module_init(mac_esp_init);

module_exit(mac_esp_exit);
Overall Contributors
Person Tokens Prop Commits CommitProp
finn thain finn thain 2309 99.83% 7 77.78%
tejun heo tejun heo 3 0.13% 1 11.11%
al viro al viro 1 0.04% 1 11.11%
Total 2313 100.00% 9 100.00%
  Directory: drivers/scsi

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
finn thain	finn thain	32	100.00%	1	100.00%
	Total	32	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/scsi/mac_esp.c

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