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Message-ID: <20100929062710.GC2439@angua.secretlab.ca>
Date: Wed, 29 Sep 2010 15:27:10 +0900
From: Grant Likely <grant.likely@...retlab.ca>
To: Michal Simek <monstr@...str.eu>
Cc: linux-kernel@...r.kernel.org, john.williams@...alogix.com,
edgar.iglesias@...il.com, duyl@...inx.com, linnj@...inx.com,
microblaze-uclinux@...e.uq.edu.au
Subject: Re: [PATCH 7/7] microblaze: Add support for little-endian
Microblaze
On Wed, Sep 29, 2010 at 03:52:18PM +1000, Michal Simek wrote:
> Microblaze little-endian toolchain exports __MICROBLAZEEL__
> which is used in the kernel to identify little/big endian.
>
> The most of the changes are in loading values from DTB which
> is always big endian.
>
> Little endian platforms are based on new AXI bus which has
> impact to early uartlite initialization.
>
> Signed-off-by: Michal Simek <monstr@...str.eu>
Hi Michal,
Looks pretty good, but a few comments below.
> ---
> arch/microblaze/include/asm/byteorder.h | 4 ++++
> arch/microblaze/include/asm/checksum.h | 9 +++++++--
> arch/microblaze/include/asm/cpuinfo.h | 3 ++-
> arch/microblaze/include/asm/elf.h | 2 +-
> arch/microblaze/include/asm/unaligned.h | 12 +++++++++---
> arch/microblaze/kernel/heartbeat.c | 3 ++-
> arch/microblaze/kernel/intc.c | 9 ++++++---
> arch/microblaze/kernel/prom.c | 7 ++++---
> arch/microblaze/kernel/timer.c | 8 +++++---
> arch/microblaze/kernel/vmlinux.lds.S | 4 ++++
> 10 files changed, 44 insertions(+), 17 deletions(-)
>
> diff --git a/arch/microblaze/include/asm/byteorder.h b/arch/microblaze/include/asm/byteorder.h
> index ce9c587..3190276 100644
> --- a/arch/microblaze/include/asm/byteorder.h
> +++ b/arch/microblaze/include/asm/byteorder.h
> @@ -1,6 +1,10 @@
> #ifndef _ASM_MICROBLAZE_BYTEORDER_H
> #define _ASM_MICROBLAZE_BYTEORDER_H
>
> +#ifdef __MICROBLAZEEL__
> +#include <linux/byteorder/little_endian.h>
> +#else
> #include <linux/byteorder/big_endian.h>
> +#endif
>
> #endif /* _ASM_MICROBLAZE_BYTEORDER_H */
> diff --git a/arch/microblaze/include/asm/checksum.h b/arch/microblaze/include/asm/checksum.h
> index 128bf03..0185cbe 100644
> --- a/arch/microblaze/include/asm/checksum.h
> +++ b/arch/microblaze/include/asm/checksum.h
> @@ -24,8 +24,13 @@ csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
> "addc %0, %0, %3\n\t"
> "addc %0, %0, r0\n\t"
> : "+&d" (sum)
> - : "d" (saddr), "d" (daddr), "d" (len + proto));
> -
> + : "d" (saddr), "d" (daddr),
> +#ifdef __MICROBLAZEEL__
> + "d" ((len + proto) << 8)
> +#else
> + "d" (len + proto)
> +#endif
> +);
> return sum;
> }
>
> diff --git a/arch/microblaze/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
> index 0d4f0ce..7fab800 100644
> --- a/arch/microblaze/include/asm/cpuinfo.h
> +++ b/arch/microblaze/include/asm/cpuinfo.h
> @@ -98,7 +98,8 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu);
> static inline unsigned int fcpu(struct device_node *cpu, char *n)
> {
> int *val;
> - return (val = (int *) of_get_property(cpu, n, NULL)) ? *val : 0;
> + return (val = (int *) of_get_property(cpu, n, NULL)) ?
> + be32_to_cpup(val) : 0;
> }
>
> #endif /* _ASM_MICROBLAZE_CPUINFO_H */
> diff --git a/arch/microblaze/include/asm/elf.h b/arch/microblaze/include/asm/elf.h
> index 732caf1..098dfdd 100644
> --- a/arch/microblaze/include/asm/elf.h
> +++ b/arch/microblaze/include/asm/elf.h
> @@ -71,7 +71,7 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
>
> #define ELF_ET_DYN_BASE (0x08000000)
>
> -#ifdef __LITTLE_ENDIAN__
> +#ifdef __MICROBLAZEEL__
> #define ELF_DATA ELFDATA2LSB
> #else
> #define ELF_DATA ELFDATA2MSB
> diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
> index 3658d91..2b97cbe 100644
> --- a/arch/microblaze/include/asm/unaligned.h
> +++ b/arch/microblaze/include/asm/unaligned.h
> @@ -12,12 +12,18 @@
>
> # ifdef __KERNEL__
>
> -# include <linux/unaligned/be_struct.h>
> +# include <linux/unaligned/be_byteshift.h>
> # include <linux/unaligned/le_byteshift.h>
> # include <linux/unaligned/generic.h>
>
> -# define get_unaligned __get_unaligned_be
> -# define put_unaligned __put_unaligned_be
> +
> +# ifdef __MICROBLAZEEL__
> +# define get_unaligned __get_unaligned_le
> +# define put_unaligned __put_unaligned_le
> +# else
> +# define get_unaligned __get_unaligned_be
> +# define put_unaligned __put_unaligned_be
> +# endif
>
> # endif /* __KERNEL__ */
> #endif /* _ASM_MICROBLAZE_UNALIGNED_H */
> diff --git a/arch/microblaze/kernel/heartbeat.c b/arch/microblaze/kernel/heartbeat.c
> index 5c24eb8..efb9a9d 100644
> --- a/arch/microblaze/kernel/heartbeat.c
> +++ b/arch/microblaze/kernel/heartbeat.c
> @@ -59,7 +59,8 @@ void setup_heartbeat(void)
> }
>
> if (gpio) {
> - base_addr = *(int *) of_get_property(gpio, "reg", NULL);
> + base_addr = be32_to_cpup((int *)of_get_property(gpio,
> + "reg", NULL));
> base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
> printk(KERN_NOTICE "Heartbeat GPIO at 0x%x\n", base_addr);
>
> diff --git a/arch/microblaze/kernel/intc.c b/arch/microblaze/kernel/intc.c
> index e85bbea..d175a5b 100644
> --- a/arch/microblaze/kernel/intc.c
> +++ b/arch/microblaze/kernel/intc.c
> @@ -138,12 +138,15 @@ void __init init_IRQ(void)
> }
> BUG_ON(!intc);
>
> - intc_baseaddr = *(int *) of_get_property(intc, "reg", NULL);
> + intc_baseaddr = be32_to_cpup((int *) of_get_property(intc,
> + "reg", NULL));
> intc_baseaddr = (unsigned long) ioremap(intc_baseaddr, PAGE_SIZE);
> - nr_irq = *(int *) of_get_property(intc, "xlnx,num-intr-inputs", NULL);
> + nr_irq = be32_to_cpup((int *) of_get_property(intc,
> + "xlnx,num-intr-inputs", NULL));
>
> intr_type =
> - *(int *) of_get_property(intc, "xlnx,kind-of-intr", NULL);
> + be32_to_cpup((int *) of_get_property(intc,
> + "xlnx,kind-of-intr", NULL));
Unnecessary casts (see comment below)
> if (intr_type >= (1 << (nr_irq + 1)))
> printk(KERN_INFO " ERROR: Mismatch in kind-of-intr param\n");
>
> diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
> index 3617b17..14c81c1 100644
> --- a/arch/microblaze/kernel/prom.c
> +++ b/arch/microblaze/kernel/prom.c
> @@ -77,7 +77,8 @@ static int __init early_init_dt_scan_serial(unsigned long node,
> /* find compatible node with uartlite */
> p = of_get_flat_dt_prop(node, "compatible", &l);
> if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
> - (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
> + (strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
> + (strncmp(p, "xlnx,axi-uartlite", 17) != 0))
> return 0;
>
> addr = of_get_flat_dt_prop(node, "reg", &l);
> @@ -87,7 +88,7 @@ static int __init early_init_dt_scan_serial(unsigned long node,
> /* this function is looking for early uartlite console - Microblaze specific */
> int __init early_uartlite_console(void)
> {
> - return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
> + return be32_to_cpu(of_scan_flat_dt(early_init_dt_scan_serial, NULL));
of_scan_flat_dt returns a rc that should already by in cpu endianess.
of_scan_flat_dt needs to be fixed instead.
> }
>
> /* MS this is Microblaze specifig function */
> @@ -121,7 +122,7 @@ static int __init early_init_dt_scan_serial2(unsigned long node,
> /* this function is looking for early uartlite console - Microblaze specific */
> int __init early_uart16550_console(void)
> {
> - return of_scan_flat_dt(early_init_dt_scan_serial2, NULL);
> + return be32_to_cpu(of_scan_flat_dt(early_init_dt_scan_serial2, NULL));
Ditto
> }
> #endif
>
> diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
> index 64ca14d..b4d5ce4 100644
> --- a/arch/microblaze/kernel/timer.c
> +++ b/arch/microblaze/kernel/timer.c
> @@ -270,11 +270,13 @@ void __init time_init(void)
> }
> BUG_ON(!timer);
>
> - timer_baseaddr = *(int *) of_get_property(timer, "reg", NULL);
> + timer_baseaddr = be32_to_cpup((int *) of_get_property(timer,
> + "reg", NULL));
The (int*) casting shouldn't be needed. of_get_property returns a
'const void *', and be32_to_cpup accepts a 'const __be32 *'. Ditto
through the other instances of this casting.
> timer_baseaddr = (unsigned long) ioremap(timer_baseaddr, PAGE_SIZE);
> - irq = *(int *) of_get_property(timer, "interrupts", NULL);
> + irq = be32_to_cpup((int *) of_get_property(timer, "interrupts", NULL));
> timer_num =
> - *(int *) of_get_property(timer, "xlnx,one-timer-only", NULL);
> + be32_to_cpup((int *) of_get_property(timer,
> + "xlnx,one-timer-only", NULL));
> if (timer_num) {
> eprintk(KERN_EMERG "Please enable two timers in HW\n");
> BUG();
> diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
> index 20b0552..96a88c3 100644
> --- a/arch/microblaze/kernel/vmlinux.lds.S
> +++ b/arch/microblaze/kernel/vmlinux.lds.S
> @@ -15,7 +15,11 @@ ENTRY(microblaze_start)
> #include <asm-generic/vmlinux.lds.h>
> #include <asm/thread_info.h>
>
> +#ifdef __MICROBLAZEEL__
> +jiffies = jiffies_64;
> +#else
> jiffies = jiffies_64 + 4;
> +#endif
I comment would go nicely hear to explain to reviewers what this is
about.
Cheers,
g.
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