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448 lines
12 KiB
448 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* mac_esp.c: ESP front-end for Macintosh Quadra systems. |
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* |
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* Adapted from jazz_esp.c and the old mac_esp.c. |
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* |
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* The pseudo DMA algorithm is based on the one used in NetBSD. |
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* See sys/arch/mac68k/obio/esp.c for some background information. |
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* |
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* Copyright (C) 2007-2008 Finn Thain |
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*/ |
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#include <linux/kernel.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 <linux/scatterlist.h> |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/nubus.h> |
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#include <linux/slab.h> |
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#include <asm/irq.h> |
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#include <asm/dma.h> |
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#include <asm/macints.h> |
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#include <asm/macintosh.h> |
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#include <asm/mac_via.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 "mac_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 "Sept 15, 2007" |
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#define MAC_ESP_IO_BASE 0x50F00000 |
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#define MAC_ESP_REGS_QUADRA (MAC_ESP_IO_BASE + 0x10000) |
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#define MAC_ESP_REGS_QUADRA2 (MAC_ESP_IO_BASE + 0xF000) |
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#define MAC_ESP_REGS_QUADRA3 (MAC_ESP_IO_BASE + 0x18000) |
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#define MAC_ESP_REGS_SPACING 0x402 |
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#define MAC_ESP_PDMA_REG 0xF9800024 |
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#define MAC_ESP_PDMA_REG_SPACING 0x4 |
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#define MAC_ESP_PDMA_IO_OFFSET 0x100 |
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#define esp_read8(REG) mac_esp_read8(esp, REG) |
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#define esp_write8(VAL, REG) mac_esp_write8(esp, VAL, REG) |
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struct mac_esp_priv { |
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struct esp *esp; |
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void __iomem *pdma_regs; |
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void __iomem *pdma_io; |
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}; |
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static struct esp *esp_chips[2]; |
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static DEFINE_SPINLOCK(esp_chips_lock); |
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#define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \ |
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dev_get_drvdata((esp)->dev)) |
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static inline void mac_esp_write8(struct esp *esp, u8 val, unsigned long reg) |
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{ |
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nubus_writeb(val, esp->regs + reg * 16); |
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} |
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static inline u8 mac_esp_read8(struct esp *esp, unsigned long reg) |
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{ |
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return nubus_readb(esp->regs + reg * 16); |
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} |
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static void mac_esp_reset_dma(struct esp *esp) |
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{ |
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/* Nothing to do. */ |
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} |
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static void mac_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 mac_esp_dma_invalidate(struct esp *esp) |
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{ |
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/* Nothing to do. */ |
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} |
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static int mac_esp_dma_error(struct esp *esp) |
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{ |
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return esp->send_cmd_error; |
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} |
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static inline int mac_esp_wait_for_empty_fifo(struct esp *esp) |
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{ |
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int i = 500000; |
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do { |
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if (!(esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES)) |
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return 0; |
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if (esp_read8(ESP_STATUS) & ESP_STAT_INTR) |
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return 1; |
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udelay(2); |
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} while (--i); |
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printk(KERN_ERR PFX "FIFO is not empty (sreg %02x)\n", |
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esp_read8(ESP_STATUS)); |
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esp->send_cmd_error = 1; |
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return 1; |
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} |
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static inline int mac_esp_wait_for_dreq(struct esp *esp) |
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{ |
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struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
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int i = 500000; |
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do { |
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if (mep->pdma_regs == NULL) { |
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if (via2_scsi_drq_pending()) |
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return 0; |
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} else { |
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if (nubus_readl(mep->pdma_regs) & 0x200) |
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return 0; |
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} |
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if (esp_read8(ESP_STATUS) & ESP_STAT_INTR) |
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return 1; |
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udelay(2); |
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} while (--i); |
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printk(KERN_ERR PFX "PDMA timeout (sreg %02x)\n", |
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esp_read8(ESP_STATUS)); |
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esp->send_cmd_error = 1; |
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return 1; |
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} |
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#define MAC_ESP_PDMA_LOOP(operands) \ |
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asm volatile ( \ |
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" tstw %1 \n" \ |
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" jbeq 20f \n" \ |
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"1: movew " operands " \n" \ |
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"2: movew " operands " \n" \ |
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"3: movew " operands " \n" \ |
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"4: movew " operands " \n" \ |
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"5: movew " operands " \n" \ |
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"6: movew " operands " \n" \ |
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"7: movew " operands " \n" \ |
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"8: movew " operands " \n" \ |
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"9: movew " operands " \n" \ |
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"10: movew " operands " \n" \ |
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"11: movew " operands " \n" \ |
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"12: movew " operands " \n" \ |
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"13: movew " operands " \n" \ |
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"14: movew " operands " \n" \ |
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"15: movew " operands " \n" \ |
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"16: movew " operands " \n" \ |
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" subqw #1,%1 \n" \ |
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" jbne 1b \n" \ |
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"20: tstw %2 \n" \ |
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" jbeq 30f \n" \ |
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"21: movew " operands " \n" \ |
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" subqw #1,%2 \n" \ |
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" jbne 21b \n" \ |
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"30: tstw %3 \n" \ |
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" jbeq 40f \n" \ |
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"31: moveb " operands " \n" \ |
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"32: nop \n" \ |
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"40: \n" \ |
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" \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" .align 4 \n" \ |
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" .long 1b,40b \n" \ |
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" .long 2b,40b \n" \ |
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" .long 3b,40b \n" \ |
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" .long 4b,40b \n" \ |
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" .long 5b,40b \n" \ |
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" .long 6b,40b \n" \ |
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" .long 7b,40b \n" \ |
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" .long 8b,40b \n" \ |
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" .long 9b,40b \n" \ |
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" .long 10b,40b \n" \ |
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" .long 11b,40b \n" \ |
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" .long 12b,40b \n" \ |
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" .long 13b,40b \n" \ |
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" .long 14b,40b \n" \ |
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" .long 15b,40b \n" \ |
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" .long 16b,40b \n" \ |
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" .long 21b,40b \n" \ |
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" .long 31b,40b \n" \ |
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" .long 32b,40b \n" \ |
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" .previous \n" \ |
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: "+a" (addr), "+r" (count32), "+r" (count2) \ |
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: "g" (count1), "a" (mep->pdma_io)) |
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static void mac_esp_send_pdma_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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struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); |
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esp->send_cmd_error = 0; |
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if (!write) |
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scsi_esp_cmd(esp, ESP_CMD_FLUSH); |
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esp_write8((esp_count >> 0) & 0xFF, ESP_TCLOW); |
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esp_write8((esp_count >> 8) & 0xFF, ESP_TCMED); |
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scsi_esp_cmd(esp, cmd); |
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do { |
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unsigned int count32 = esp_count >> 5; |
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unsigned int count2 = (esp_count & 0x1F) >> 1; |
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unsigned int count1 = esp_count & 1; |
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unsigned int start_addr = addr; |
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if (mac_esp_wait_for_dreq(esp)) |
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break; |
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if (write) { |
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MAC_ESP_PDMA_LOOP("%4@,%0@+"); |
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esp_count -= addr - start_addr; |
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} else { |
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unsigned int n; |
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MAC_ESP_PDMA_LOOP("%0@+,%4@"); |
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if (mac_esp_wait_for_empty_fifo(esp)) |
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break; |
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n = (esp_read8(ESP_TCMED) << 8) + esp_read8(ESP_TCLOW); |
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addr = start_addr + esp_count - n; |
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esp_count = n; |
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} |
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} while (esp_count); |
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} |
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static int mac_esp_irq_pending(struct esp *esp) |
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{ |
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if (esp_read8(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 u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len) |
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{ |
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return dma_len > 0xFFFF ? 0xFFFF : dma_len; |
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} |
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static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id) |
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{ |
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int got_intr; |
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/* |
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* This is an edge triggered IRQ, so we have to be careful to |
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* avoid missing a transition when it is shared by two ESP devices. |
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*/ |
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do { |
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got_intr = 0; |
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if (esp_chips[0] && |
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(mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) { |
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(void)scsi_esp_intr(irq, esp_chips[0]); |
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got_intr = 1; |
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} |
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if (esp_chips[1] && |
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(mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) { |
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(void)scsi_esp_intr(irq, esp_chips[1]); |
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got_intr = 1; |
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} |
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} while (got_intr); |
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return IRQ_HANDLED; |
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} |
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static struct esp_driver_ops mac_esp_ops = { |
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.esp_write8 = mac_esp_write8, |
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.esp_read8 = mac_esp_read8, |
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.irq_pending = mac_esp_irq_pending, |
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.dma_length_limit = mac_esp_dma_length_limit, |
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.reset_dma = mac_esp_reset_dma, |
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.dma_drain = mac_esp_dma_drain, |
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.dma_invalidate = mac_esp_dma_invalidate, |
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.send_dma_cmd = mac_esp_send_pdma_cmd, |
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.dma_error = mac_esp_dma_error, |
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}; |
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static int esp_mac_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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int err; |
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struct mac_esp_priv *mep; |
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if (!MACH_IS_MAC) |
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return -ENODEV; |
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if (dev->id > 1) |
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return -ENODEV; |
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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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host->dma_boundary = PAGE_SIZE - 1; |
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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->command_block = kzalloc(16, GFP_KERNEL); |
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if (!esp->command_block) |
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goto fail_unlink; |
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esp->command_block_dma = (dma_addr_t)esp->command_block; |
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esp->scsi_id = 7; |
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host->this_id = esp->scsi_id; |
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esp->scsi_id_mask = 1 << esp->scsi_id; |
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mep = kzalloc(sizeof(struct mac_esp_priv), GFP_KERNEL); |
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if (!mep) |
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goto fail_free_command_block; |
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mep->esp = esp; |
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platform_set_drvdata(dev, mep); |
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switch (macintosh_config->scsi_type) { |
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case MAC_SCSI_QUADRA: |
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esp->cfreq = 16500000; |
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esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA; |
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mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET; |
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mep->pdma_regs = NULL; |
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break; |
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case MAC_SCSI_QUADRA2: |
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esp->cfreq = 25000000; |
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esp->regs = (void __iomem *)(MAC_ESP_REGS_QUADRA2 + |
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dev->id * MAC_ESP_REGS_SPACING); |
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mep->pdma_io = esp->regs + MAC_ESP_PDMA_IO_OFFSET; |
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mep->pdma_regs = (void __iomem *)(MAC_ESP_PDMA_REG + |
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dev->id * MAC_ESP_PDMA_REG_SPACING); |
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nubus_writel(0x1d1, mep->pdma_regs); |
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break; |
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case MAC_SCSI_QUADRA3: |
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/* These quadras have a real DMA controller (the PSC) but we |
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* don't know how to drive it so we must use PIO instead. |
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*/ |
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esp->cfreq = 25000000; |
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esp->regs = (void __iomem *)MAC_ESP_REGS_QUADRA3; |
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mep->pdma_io = NULL; |
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mep->pdma_regs = NULL; |
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break; |
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} |
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esp->fifo_reg = esp->regs + ESP_FDATA * 16; |
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esp->ops = &mac_esp_ops; |
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esp->flags = ESP_FLAG_NO_DMA_MAP; |
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if (mep->pdma_io == NULL) { |
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printk(KERN_INFO PFX "using PIO for controller %d\n", dev->id); |
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esp_write8(0, ESP_TCLOW); |
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esp_write8(0, ESP_TCMED); |
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esp->flags |= ESP_FLAG_DISABLE_SYNC; |
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mac_esp_ops.send_dma_cmd = esp_send_pio_cmd; |
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} else { |
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printk(KERN_INFO PFX "using PDMA for controller %d\n", dev->id); |
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} |
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host->irq = IRQ_MAC_SCSI; |
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/* The request_irq() call is intended to succeed for the first device |
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* and fail for the second device. |
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*/ |
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err = request_irq(host->irq, mac_scsi_esp_intr, 0, "ESP", NULL); |
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spin_lock(&esp_chips_lock); |
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if (err < 0 && esp_chips[!dev->id] == NULL) { |
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spin_unlock(&esp_chips_lock); |
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goto fail_free_priv; |
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} |
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esp_chips[dev->id] = esp; |
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spin_unlock(&esp_chips_lock); |
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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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spin_lock(&esp_chips_lock); |
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esp_chips[dev->id] = NULL; |
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if (esp_chips[!dev->id] == NULL) { |
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spin_unlock(&esp_chips_lock); |
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free_irq(host->irq, NULL); |
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} else |
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spin_unlock(&esp_chips_lock); |
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fail_free_priv: |
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kfree(mep); |
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fail_free_command_block: |
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kfree(esp->command_block); |
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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_mac_remove(struct platform_device *dev) |
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{ |
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struct mac_esp_priv *mep = platform_get_drvdata(dev); |
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struct esp *esp = mep->esp; |
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unsigned int irq = esp->host->irq; |
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scsi_esp_unregister(esp); |
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spin_lock(&esp_chips_lock); |
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esp_chips[dev->id] = NULL; |
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if (esp_chips[!dev->id] == NULL) { |
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spin_unlock(&esp_chips_lock); |
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free_irq(irq, NULL); |
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} else |
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spin_unlock(&esp_chips_lock); |
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kfree(mep); |
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kfree(esp->command_block); |
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scsi_host_put(esp->host); |
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return 0; |
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} |
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static struct platform_driver esp_mac_driver = { |
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.probe = esp_mac_probe, |
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.remove = esp_mac_remove, |
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.driver = { |
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.name = DRV_MODULE_NAME, |
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}, |
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}; |
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module_platform_driver(esp_mac_driver); |
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MODULE_DESCRIPTION("Mac ESP SCSI driver"); |
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MODULE_AUTHOR("Finn Thain"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_VERSION(DRV_VERSION); |
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MODULE_ALIAS("platform:" DRV_MODULE_NAME);
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