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    Subject[PATCH] ppc64: Add mecanism to check existence of legacy ISA devices
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    Date
    Hi !

    This patch adds an arch function that can be overriden by the various
    platforms at runtime, to query if a given legacy IO device actually
    exist on the platform (based on the standard base port). This, along
    with the 8250 patches posted separately, allow a single kernel image
    to boot pSeries and PowerMac machines without having the legacy drivers
    crashing the box on a PowerMac. This will be used by some new ppc64
    platforms that are coming soon too.

    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>


    Index: linux-work/arch/ppc64/kernel/pSeries_setup.c
    ===================================================================
    --- linux-work.orig/arch/ppc64/kernel/pSeries_setup.c 2004-10-23 09:38:24.178765968 +1000
    +++ linux-work/arch/ppc64/kernel/pSeries_setup.c 2004-10-23 10:19:20.737312304 +1000
    @@ -476,6 +476,31 @@
    setup_default_decr();
    }

    +static int pSeries_check_legacy_ioport(unsigned int baseport)
    +{
    + struct device_node *np;
    +
    +#define I8042_DATA_REG 0x60
    +#define FDC_BASE 0x3f0
    +
    +
    + switch(baseport) {
    + case I8042_DATA_REG:
    + np = of_find_node_by_type(NULL, "8042");
    + if (np == NULL)
    + return -ENODEV;
    + of_node_put(np);
    + break;
    + case FDC_BASE:
    + np = of_find_node_by_type(NULL, "fdc");
    + if (np == NULL)
    + return -ENODEV;
    + of_node_put(np);
    + break;
    + }
    + return 0;
    +}
    +
    /*
    * Called very early, MMU is off, device-tree isn't unflattened
    */
    @@ -510,4 +535,5 @@
    .set_rtc_time = pSeries_set_rtc_time,
    .calibrate_decr = pSeries_calibrate_decr,
    .progress = pSeries_progress,
    + .check_legacy_ioport = pSeries_check_legacy_ioport,
    };
    Index: linux-work/arch/ppc64/kernel/pmac_setup.c
    ===================================================================
    --- linux-work.orig/arch/ppc64/kernel/pmac_setup.c 2004-10-21 11:47:00.000000000 +1000
    +++ linux-work/arch/ppc64/kernel/pmac_setup.c 2004-10-23 10:19:20.748310632 +1000
    @@ -420,6 +420,15 @@
    #endif /* CONFIG_BOOTX_TEXT */
    }

    +/*
    + * pmac has no legacy IO, anything calling this function has to
    + * fail or bad things will happen
    + */
    +static int pmac_check_legacy_ioport(unsigned int baseport)
    +{
    + return -ENODEV;
    +}
    +
    static int __init pmac_declare_of_platform_devices(void)
    {
    struct device_node *np;
    @@ -474,4 +483,5 @@
    .calibrate_decr = pmac_calibrate_decr,
    .feature_call = pmac_do_feature_call,
    .progress = pmac_progress,
    + .check_legacy_ioport = pmac_check_legacy_ioport
    };
    Index: linux-work/include/asm-ppc64/floppy.h
    ===================================================================
    --- linux-work.orig/include/asm-ppc64/floppy.h 2004-09-24 14:36:11.000000000 +1000
    +++ linux-work/include/asm-ppc64/floppy.h 2004-10-23 10:19:20.749310480 +1000
    @@ -11,6 +11,7 @@
    #define __ASM_PPC64_FLOPPY_H

    #include <linux/config.h>
    +#include <asm/machdep.h>

    #define fd_inb(port) inb_p(port)
    #define fd_outb(value,port) outb_p(value,port)
    Index: linux-work/include/asm-ppc64/machdep.h
    ===================================================================
    --- linux-work.orig/include/asm-ppc64/machdep.h 2004-09-29 18:24:23.000000000 +1000
    +++ linux-work/include/asm-ppc64/machdep.h 2004-10-23 10:19:20.750310328 +1000
    @@ -114,6 +114,9 @@
    */
    long (*feature_call)(unsigned int feature, ...);

    + /* Check availability of legacy devices like i8042 */
    + int (*check_legacy_ioport)(unsigned int baseport);
    +
    };

    extern struct machdep_calls ppc_md;
    Index: linux-work/drivers/block/floppy.c
    ===================================================================
    --- linux-work.orig/drivers/block/floppy.c 2004-09-24 14:33:36.000000000 +1000
    +++ linux-work/drivers/block/floppy.c 2004-10-23 10:19:20.758309112 +1000
    @@ -4286,6 +4286,14 @@
    }

    use_virtual_dma = can_use_virtual_dma & 1;
    +#if defined(CONFIG_PPC64)
    + if (ppc_md.check_legacy_ioport)
    + if (ppc_md.check_legacy_ioport(FDC1)) {
    + del_timer(&fd_timeout);
    + err = -ENODEV;
    + goto out_unreg_region;
    + }
    +#endif
    fdc_state[0].address = FDC1;
    if (fdc_state[0].address == -1) {
    del_timer(&fd_timeout);
    Index: linux-work/drivers/input/serio/i8042-io.h
    ===================================================================
    --- linux-work.orig/drivers/input/serio/i8042-io.h 2004-09-24 14:34:02.000000000 +1000
    +++ linux-work/drivers/input/serio/i8042-io.h 2004-10-23 10:19:20.759308960 +1000
    @@ -35,6 +35,10 @@
    # define I8042_AUX_IRQ 12
    #endif

    +#ifdef CONFIG_PPC64
    +#include <asm/machdep.h>
    +#endif
    +
    /*
    * Register numbers.
    */
    @@ -96,7 +100,7 @@
    * On ix86 platforms touching the i8042 data register region can do really
    * bad things. Because of this the region is always reserved on ix86 boxes.
    */
    -#if !defined(__i386__) && !defined(__sh__) && !defined(__alpha__) && !defined(__x86_64__) && !defined(__mips__)
    +#if !defined(__i386__) && !defined(__sh__) && !defined(__alpha__) && !defined(__x86_64__) && !defined(__mips__) && !defined (CONFIG_PPC64)
    if (!request_region(I8042_DATA_REG, 16, "i8042"))
    return -1;
    #endif
    @@ -110,12 +114,19 @@
    i8042_noloop = 1;
    #endif

    +#if defined(CONFIG_PPC64)
    + if (ppc_md.check_legacy_ioport)
    + if (ppc_md.check_legacy_ioport(I8042_DATA_REG))
    + return -1;
    + if (!request_region(I8042_DATA_REG, 16, "i8042"))
    + return -1;
    +#endif
    return 0;
    }

    static inline void i8042_platform_exit(void)
    {
    -#if !defined(__i386__) && !defined(__sh__) && !defined(__alpha__) && !defined(__x86_64__)
    +#if !defined(__i386__) && !defined(__sh__) && !defined(__alpha__) && !defined(__x86_64__) && !defined(CONFIG_PPC64)
    release_region(I8042_DATA_REG, 16);
    #endif
    }
    Index: linux-work/arch/ppc64/kernel/pSeries_pci.c
    ===================================================================
    --- linux-work.orig/arch/ppc64/kernel/pSeries_pci.c 2004-10-20 13:01:00.000000000 +1000
    +++ linux-work/arch/ppc64/kernel/pSeries_pci.c 2004-10-23 10:19:20.761308656 +1000
    @@ -619,25 +619,12 @@

    static void __init pSeries_request_regions(void)
    {
    - struct device_node *i8042;
    -
    request_region(0x20,0x20,"pic1");
    request_region(0xa0,0x20,"pic2");
    request_region(0x00,0x20,"dma1");
    request_region(0x40,0x20,"timer");
    request_region(0x80,0x10,"dma page reg");
    request_region(0xc0,0x20,"dma2");
    -
    -#define I8042_DATA_REG 0x60
    -
    - /*
    - * Some machines have an unterminated i8042 so check the device
    - * tree and reserve the region if it does not appear. Later on
    - * the i8042 code will try and reserve this region and fail.
    - */
    - if (!(i8042 = of_find_node_by_type(NULL, "8042")))
    - request_region(I8042_DATA_REG, 16, "reserved (no i8042)");
    - of_node_put(i8042);
    }

    void __init pSeries_final_fixup(void)

    -
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