--- /dev/null
+/* 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 <asm/irq.h>
+#include <asm/dma.h>
+
+#include <asm/macints.h>
+#include <asm/macintosh.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 platform_device *internal_esp, *external_esp;
+
+#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);
+}
+
+static inline u8 mac_esp_read8(struct esp *esp, unsigned long reg)
+{
+ return nubus_readb(esp->regs + reg * 16);
+}
+
+/* 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;
+}
+
+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;
+}
+
+static void mac_esp_unmap_single(struct esp *esp, dma_addr_t addr,
+ size_t sz, int dir)
+{
+ /* Nothing to do. */
+}
+
+static void mac_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
+ int num_sg, int dir)
+{
+ /* Nothing to do. */
+}
+
+static void mac_esp_reset_dma(struct esp *esp)
+{
+ /* Nothing to do. */
+}
+
+static void mac_esp_dma_drain(struct esp *esp)
+{
+ /* Nothing to do. */
+}
+
+static void mac_esp_dma_invalidate(struct esp *esp)
+{
+ /* Nothing to do. */
+}
+
+static int mac_esp_dma_error(struct esp *esp)
+{
+ return MAC_ESP_GET_PRIV(esp)->error;
+}
+
+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;
+}
+
+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 (mac_irq_pending(IRQ_MAC_SCSIDRQ))
+ 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;
+}
+
+#define MAC_ESP_PDMA_LOOP(operands) \
+ asm volatile ( \
+ " tstw %2 \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,%2 \n" \
+ " jbne 1b \n" \
+ "20: tstw %3 \n" \
+ " jbeq 30f \n" \
+ "21: movew " operands " \n" \
+ " subqw #1,%3 \n" \
+ " jbne 21b \n" \
+ "30: tstw %4 \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) \
+ : "a" (mep->pdma_io), "r" (count32), "r" (count2), "g" (esp_count))
+
+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);
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ 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 start_addr = addr;
+
+ if (mac_esp_wait_for_dreq(esp))
+ break;
+
+ if (write) {
+ MAC_ESP_PDMA_LOOP("%1@,%0@+");
+
+ esp_count -= addr - start_addr;
+ } else {
+ unsigned int n;
+
+ MAC_ESP_PDMA_LOOP("%0@+,%1@");
+
+ 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);
+
+ local_irq_restore(flags);
+}
+
+/*
+ * Programmed IO routines follow.
+ */
+
+static inline int mac_esp_wait_for_fifo(struct esp *esp)
+{
+ int i = 500000;
+
+ do {
+ if (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES)
+ return 0;
+
+ udelay(2);
+ } while (--i);
+
+ printk(KERN_ERR PFX "FIFO is empty (sreg %02x)\n",
+ esp_read8(ESP_STATUS));
+ return 1;
+}
+
+static inline int mac_esp_wait_for_intr(struct esp *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);
+ return 1;
+}
+
+#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)
+{
+ unsigned long flags;
+ struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
+ u8 *fifo = esp->regs + ESP_FDATA * 16;
+
+ local_irq_save(flags);
+
+ cmd &= ~ESP_CMD_DMA;
+ mep->error = 0;
+
+ if (write) {
+ scsi_esp_cmd(esp, cmd);
+
+ if (!mac_esp_wait_for_intr(esp)) {
+ if (mac_esp_wait_for_fifo(esp))
+ esp_count = 0;
+ } else {
+ esp_count = 0;
+ }
+ } 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)) {
+ mep->error = 1;
+ break;
+ }
+
+ if (esp->sreg & ESP_STAT_SPAM) {
+ printk(KERN_ERR PFX "gross error\n");
+ mep->error = 1;
+ break;
+ }
+
+ n = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
+
+ if (write) {
+ if (n > esp_count)
+ n = esp_count;
+ esp_count -= n;
+
+ MAC_ESP_PIO_LOOP("%2@,%0@+", n);
+
+ if ((esp->sreg & ESP_STAT_PMASK) == ESP_STATP)
+ break;
+
+ if (esp_count) {
+ esp->ireg = esp_read8(ESP_INTRPT);
+ if (esp->ireg & ESP_INTR_DC)
+ break;
+
+ scsi_esp_cmd(esp, ESP_CMD_TI);
+ }
+ } else {
+ esp->ireg = esp_read8(ESP_INTRPT);
+ if (esp->ireg & ESP_INTR_DC)
+ break;
+
+ n = MAC_ESP_FIFO_SIZE - n;
+ 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);
+ }
+ }
+
+ local_irq_restore(flags);
+}
+
+static int mac_esp_irq_pending(struct esp *esp)
+{
+ if (esp_read8(ESP_STATUS) & ESP_STAT_INTR)
+ return 1;
+ return 0;
+}
+
+static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
+{
+ return dma_len > 0xFFFF ? 0xFFFF : dma_len;
+}
+
+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 __devinit esp_mac_probe(struct platform_device *dev)
+{
+ struct scsi_host_template *tpnt = &scsi_esp_template;
+ struct Scsi_Host *host;
+ struct esp *esp;
+ int err;
+ int chips_present;
+ struct mac_esp_priv *mep;
+
+ if (!MACH_IS_MAC)
+ return -ENODEV;
+
+ switch (macintosh_config->scsi_type) {
+ case MAC_SCSI_QUADRA:
+ case MAC_SCSI_QUADRA3:
+ chips_present = 1;
+ break;
+ case MAC_SCSI_QUADRA2:
+ if ((macintosh_config->ident == MAC_MODEL_Q900) ||
+ (macintosh_config->ident == MAC_MODEL_Q950))
+ chips_present = 2;
+ else
+ chips_present = 1;
+ break;
+ default:
+ chips_present = 0;
+ }
+
+ if (dev->id + 1 > chips_present)
+ 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;
+ err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "Mac ESP",
+ esp);
+ if (err < 0)
+ goto fail_free_priv;
+
+ err = scsi_esp_register(esp, &dev->dev);
+ if (err)
+ goto fail_free_irq;
+
+ return 0;
+
+fail_free_irq:
+ 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;
+}
+
+static int __devexit 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);
+
+ free_irq(irq, esp);
+
+ kfree(mep);
+
+ kfree(esp->command_block);
+
+ scsi_host_put(esp->host);
+
+ return 0;
+}
+
+static struct platform_driver esp_mac_driver = {
+ .probe = esp_mac_probe,
+ .remove = __devexit_p(esp_mac_remove),
+ .driver = {
+ .name = DRV_MODULE_NAME,
+ },
+};
+
+static int __init mac_esp_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&esp_mac_driver);
+ if (err)
+ return err;
+
+ internal_esp = platform_device_alloc(DRV_MODULE_NAME, 0);
+ if (internal_esp && platform_device_add(internal_esp)) {
+ platform_device_put(internal_esp);
+ internal_esp = NULL;
+ }
+
+ external_esp = platform_device_alloc(DRV_MODULE_NAME, 1);
+ if (external_esp && platform_device_add(external_esp)) {
+ platform_device_put(external_esp);
+ external_esp = NULL;
+ }
+
+ if (internal_esp || external_esp) {
+ return 0;
+ } else {
+ platform_driver_unregister(&esp_mac_driver);
+ return -ENOMEM;
+ }
+}
+
+static void __exit mac_esp_exit(void)
+{
+ platform_driver_unregister(&esp_mac_driver);
+
+ if (internal_esp) {
+ platform_device_unregister(internal_esp);
+ internal_esp = NULL;
+ }
+ if (external_esp) {
+ platform_device_unregister(external_esp);
+ external_esp = NULL;
+ }
+}
+
+MODULE_DESCRIPTION("Mac ESP SCSI driver");
+MODULE_AUTHOR("Finn Thain <fthain@telegraphics.com.au>");
+MODULE_LICENSE("GPLv2");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(mac_esp_init);
+module_exit(mac_esp_exit);
projects / openwrt / staging / blogic.git / commitdiff