Re: [PATCH v2 1/3] arm: npcm: add basic support for Nuvoton BMCs

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On 1 September 2017 at 01:53, Brendan Higgins <brendanhiggins@xxxxxxxxxx> wrote:
> Adds basic support for the Nuvoton NPCM750 BMC.
>
> Signed-off-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> ---
>  arch/arm/Kconfig             |   2 +
>  arch/arm/Makefile            |   1 +
>  arch/arm/mach-npcm/Kconfig   |  58 +++++++++++++++
>  arch/arm/mach-npcm/Makefile  |   3 +
>  arch/arm/mach-npcm/headsmp.S | 120 +++++++++++++++++++++++++++++++
>  arch/arm/mach-npcm/npcm7xx.c |  34 +++++++++
>  arch/arm/mach-npcm/platsmp.c | 168 +++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 386 insertions(+)
>  create mode 100644 arch/arm/mach-npcm/Kconfig
>  create mode 100644 arch/arm/mach-npcm/Makefile
>  create mode 100644 arch/arm/mach-npcm/headsmp.S
>  create mode 100644 arch/arm/mach-npcm/npcm7xx.c
>  create mode 100644 arch/arm/mach-npcm/platsmp.c
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 61a0cb15067e..05543f1cfbde 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -782,6 +782,8 @@ source "arch/arm/mach-netx/Kconfig"
>
>  source "arch/arm/mach-nomadik/Kconfig"
>
> +source "arch/arm/mach-npcm/Kconfig"
> +
>  source "arch/arm/mach-nspire/Kconfig"
>
>  source "arch/arm/plat-omap/Kconfig"
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 47d3a1ab08d2..60ca50c7d762 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -191,6 +191,7 @@ machine-$(CONFIG_ARCH_MEDIATEK)             += mediatek
>  machine-$(CONFIG_ARCH_MXS)             += mxs
>  machine-$(CONFIG_ARCH_NETX)            += netx
>  machine-$(CONFIG_ARCH_NOMADIK)         += nomadik
> +machine-$(CONFIG_ARCH_NPCM)            += npcm
>  machine-$(CONFIG_ARCH_NSPIRE)          += nspire
>  machine-$(CONFIG_ARCH_OXNAS)           += oxnas
>  machine-$(CONFIG_ARCH_OMAP1)           += omap1
> diff --git a/arch/arm/mach-npcm/Kconfig b/arch/arm/mach-npcm/Kconfig
> new file mode 100644
> index 000000000000..a45670e516b4
> --- /dev/null
> +++ b/arch/arm/mach-npcm/Kconfig
> @@ -0,0 +1,58 @@
> +menuconfig ARCH_NPCM
> +       bool "Nuvoton NPCM Architecture"
> +       select ARCH_REQUIRE_GPIOLIB
> +       select USE_OF
> +       select PINCTRL
> +       select PINCTRL_NPCM7XX
> +
> +if ARCH_NPCM
> +
> +comment "NPCMX50 CPU type"
> +
> +config CPU_NPCM750
> +       depends on ARCH_NPCM && ARCH_MULTI_V7 && !CPU_V6 && !CPU_V6K
> +       bool "Support for NPCM750 BMC CPU (Poleg)"
> +       select CACHE_L2X0
> +       select CPU_V7
> +       select ARM_GIC
> +       select ARM_ERRATA_754322
> +       select ARM_ERRATA_764369
> +       select USB_EHCI_ROOT_HUB_TT
> +       select USB_ARCH_HAS_HCD
> +       select USB_ARCH_HAS_EHCI
> +       select USB_EHCI_HCD
> +       select USB_ARCH_HAS_OHCI
> +       select USB_OHCI_HCD
> +       select USB
> +       select FIQ
> +       select CPU_USE_DOMAINS
> +       select COMMON_CLK if OF
> +       select NPCM750_TIMER
> +       select MFD_SYSCON
> +       help
> +         Support for single core NPCM750 BMC CPU (Poleg).
> +
> +         Single core variant of the Nuvoton NPCM750 BMC based on the Cortex A9.
> +
> +config CPU_NPCM750_SMP
> +       depends on CPU_NPCM750
> +       bool "Support for NPCM750 BMC CPU SMP (Poleg)"
> +       select HAVE_SMP
> +       select HAVE_ARM_SCU
> +       select ARM_ERRATA_794072
> +       select PL310_ERRATA_588369
> +       select PL310_ERRATA_727915
> +       select ARM_ERRATA_720789
> +       select DEBUG_SPINLOCK
> +       select GENERIC_CLOCKEVENTS
> +       select SMP
> +       select HAVE_ARM_TWD if SMP
> +       select HAVE_ARM_SCU if SMP
> +       select CLKDEV_LOOKUP
> +       select COMMON_CLK if OF
> +       help
> +         Support for dual core NPCM750 BMC CPU (Poleg).
> +
> +         Dual core variant of the Nuvoton NPCM750 BMC based on the Cortex A9.
> +
> +endif
> diff --git a/arch/arm/mach-npcm/Makefile b/arch/arm/mach-npcm/Makefile
> new file mode 100644
> index 000000000000..634e7c4d6b98
> --- /dev/null
> +++ b/arch/arm/mach-npcm/Makefile
> @@ -0,0 +1,3 @@
> +obj-$(CONFIG_CPU_NPCM750_SMP)  += platsmp.o headsmp.o
> +
> +obj-$(CONFIG_CPU_NPCM750)      += npcm7xx.o
> diff --git a/arch/arm/mach-npcm/headsmp.S b/arch/arm/mach-npcm/headsmp.S
> new file mode 100644
> index 000000000000..d22d2fc1a35c
> --- /dev/null
> +++ b/arch/arm/mach-npcm/headsmp.S
> @@ -0,0 +1,120 @@
> +/*
> + * linux/arch/arm/mach-realview/headsmp.S
> + *
> + * Copyright (c) 2003 ARM Limited
> + * Copyright 2017 Google, Inc.
> + *  All Rights Reserved
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/linkage.h>
> +#include <linux/init.h>
> +
> +.equ SVC_MODE, 0x13
> +.equ I_BIT, 0x80
> +.equ F_BIT, 0x40
> +
> +ENTRY(npcm7xx_wakeup_z1)
> +       stmfd   sp!, {r0-r12, lr}
> +       ldr     r0, =0x01
> +       ldr     r1, =0x01
> +       ldr     r2, =0x01
> +
> +       and     r3, r0, #0x0F /* Mask off unused bits of ID, and move to r3 */
> +       and     r1, r1, #0x0F /* Mask off unused bits of target_filter */
> +       and     r2, r2, #0x0F /* Mask off unused bits of filter_list */
> +
> +       orr     r3, r3, r1, LSL #16 /* Combine ID and target_filter */
> +       orr     r3, r3, r2, LSL #24 /* and now the filter list */
> +
> +       /* Get the address of the GIC */
> +       mrc     p15, 4, r0, c15, c0, 0 /* Read periph base address */
> +       add     r0, r0, #0x1F00 /* Add offset of the sgi_trigger reg */
> +
> +       /* Write to the Software Generated Interrupt Register (ICDSGIR) */
> +       str     r3, [r0]
> +
> +       ldmfd   sp!, {r0-r12, pc}
> +ENDPROC(npcm7xx_wakeup_z1)
> +
> +ENTRY(v7_invalidate_l1_npcmX50)
> +       mov     r0, #0
> +       mcr     p15, 0, r0, c7, c5, 0 /* invalidate I cache */
> +       mcr     p15, 2, r0, c0, c0, 0
> +       mrc     p15, 1, r0, c0, c0, 0
> +
> +       ldr     r1, =0x7fff
> +       and     r2, r1, r0, lsr #13
> +
> +       ldr     r1, =0x3ff
> +
> +       and     r3, r1, r0, lsr #3 /* NumWays - 1 */
> +       add     r2, r2, #1         /* NumSets */
> +
> +       and     r0, r0, #0x7
> +       add     r0, r0, #4 /* SetShift */
> +
> +       clz     r1, r3     /* WayShift */
> +       add     r4, r3, #1 /* NumWays */
> +1:     sub     r2, r2, #1 /* NumSets-- */
> +       mov     r3, r4     /* Temp = NumWays */
> +2:     subs    r3, r3, #1 /* Temp-- */
> +       mov     r5, r3, lsl r1
> +       mov     r6, r2, lsl r0
> +       /* Reg = (Temp << WayShift) | (NumSets << SetShift) */
> +       orr     r5, r5, r6
> +       mcr     p15, 0, r5, c7, c6, 2
> +       bgt     2b
> +       cmp     r2, #0
> +       bgt     1b
> +       dsb
> +       isb
> +       mov     pc, lr
> +ENDPROC(v7_invalidate_l1_npcmX50)
> +
> +/*
> + * MSM specific entry point for secondary CPUs.  This provides
> + * a "holding pen" into which all secondary cores are held until we're
> + * ready for them to initialise.
> + */
> +ENTRY(npcm7xx_secondary_startup)
> +       msr     CPSR_c, #(SVC_MODE)
> +
> +       bl      v7_invalidate_l1_npcmX50
> +       /* disable vector table remapping */
> +       mrc     p15, 0,r0, c1, c0, 0
> +       and     r0, #0xffffdfff
> +       mcr     p15, 0,r0, c1, c0, 0
> +
> +#ifdef CONFIG_CACHE_L2X0
> +       /* Enable L1 & L2 prefetch + Zero line */
> +       mrc     p15, 0, r0, c1, c0, 1
> +       orr     r0, r0, #(7 << 1)
> +       mcr     p15, 0, r0, c1, c0, 1
> +#endif /* CONFIG_CACHE_L2X0 */
> +
> +       mrc     p15, 0, r0, c0, c0, 5
> +       and     r0, r0, #15
> +       adr     r4, 1f
> +       ldmia   r4, {r5, r6}
> +       sub     r4, r4, r5
> +       add     r6, r6, r4
> +       str r3,[r2]
> +
> +pen:   ldr     r7, [r6]
> +       cmp     r7, r0
> +       bne     pen
> +
> +       /*
> +        * we've been released from the holding pen: secondary_stack
> +        * should now contain the SVC stack for this core
> +        */
> +       b       secondary_startup
> +ENDPROC(npcm7xx_secondary_startup)
> +
> +       .align
> +1:     .long   .
> +       .long   pen_release
> diff --git a/arch/arm/mach-npcm/npcm7xx.c b/arch/arm/mach-npcm/npcm7xx.c
> new file mode 100644
> index 000000000000..106dc62dd62b
> --- /dev/null
> +++ b/arch/arm/mach-npcm/npcm7xx.c
> @@ -0,0 +1,34 @@
> +/*
> + * Copyright (c) 2014 Nuvoton Technology corporation.
> + * Copyright 2017 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation;version 2 of the License.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <asm/mach/arch.h>
> +#include <asm/mach-types.h>
> +#include <asm/mach/map.h>
> +#include <asm/hardware/cache-l2x0.h>
> +
> +#define NPCM7XX_AUX_VAL (L310_AUX_CTRL_INSTR_PREFETCH |                               \
> +                        L310_AUX_CTRL_DATA_PREFETCH |                         \
> +                        L310_AUX_CTRL_NS_LOCKDOWN |                           \
> +                        L310_AUX_CTRL_CACHE_REPLACE_RR |                      \
> +                        L2C_AUX_CTRL_SHARED_OVERRIDE |                        \
> +                        L310_AUX_CTRL_FULL_LINE_ZERO)
> +
> +static const char *const npcm7xx_dt_match[] = {
> +       "nuvoton,npcm750",
> +       NULL
> +};
> +
> +DT_MACHINE_START(NPCM7XX_DT, "NPCMX50 Chip family")
> +       .atag_offset    = 0x100,
> +       .dt_compat      = npcm7xx_dt_match,
> +       .l2c_aux_val    = NPCM7XX_AUX_VAL,
> +       .l2c_aux_mask   = ~NPCM7XX_AUX_VAL,
> +MACHINE_END
> diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c
> new file mode 100644
> index 000000000000..4b53adb467fc
> --- /dev/null
> +++ b/arch/arm/mach-npcm/platsmp.c
> @@ -0,0 +1,168 @@
> +/*
> + * Copyright (C) 2002 ARM Ltd.
> + * Copyright (C) 2008 STMicroelctronics.
> + * Copyright (C) 2009 ST-Ericsson.
> + * Copyright 2017 Google, Inc.
> + *
> + * This file is based on arm realview platform
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#define pr_fmt(fmt) "PLATSMP: " fmt
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/smp.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +#include <asm/cacheflush.h>
> +#include <asm/smp.h>
> +#include <asm/smp_plat.h>
> +#include <asm/smp_scu.h>
> +
> +#define NPCM7XX_SCRPAD_REG 0x13c
> +
> +static void __iomem *gcr_base;
> +static void __iomem *scu_base;
> +
> +/* This is called from headsmp.S to wakeup the secondary core */
> +extern void npcm7xx_secondary_startup(void);
> +extern void npcm7xx_wakeup_z1(void);
> +
> +/*
> + * Write pen_release in a way that is guaranteed to be visible to all
> + * observers, irrespective of whether they're taking part in coherency
> + * or not.  This is necessary for the hotplug code to work reliably.
> + */
> +static void npcm7xx_write_pen_release(int val)
> +{
> +       pen_release = val;
> +       /* write to pen_release must be visible to all observers. */
> +       smp_wmb();
> +       __cpuc_flush_dcache_area((void *) &pen_release, sizeof(pen_release));
> +       outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));
> +}
> +
> +static DEFINE_SPINLOCK(boot_lock);
> +
> +static void npcm7xx_smp_secondary_init(unsigned int cpu)
> +{
> +       /*
> +        * let the primary processor know we're out of the
> +        * pen, then head off into the C entry point
> +        */
> +       npcm7xx_write_pen_release(-1);
> +
> +       /*
> +        * Synchronise with the boot thread.
> +        */
> +       spin_lock(&boot_lock);
> +       spin_unlock(&boot_lock);
> +}
> +
> +static int npcm7xx_smp_boot_secondary(unsigned int cpu, struct task_struct *idle)
> +{
> +       unsigned long timeout;
> +
> +       if (!gcr_base)
> +               return -EIO;
> +
> +       /*
> +        * set synchronisation state between this boot processor
> +        * and the secondary one
> +        */
> +       spin_lock(&boot_lock);
> +
> +       /*
> +        * The secondary processor is waiting to be released from
> +        * the holding pen - release it, then wait for it to flag
> +        * that it has been released by resetting pen_release.
> +        */
> +       npcm7xx_write_pen_release(cpu_logical_map(cpu));
> +       iowrite32(virt_to_phys(npcm7xx_secondary_startup),
> +                 gcr_base + NPCM7XX_SCRPAD_REG);
> +       /* make npcm7xx_secondary_startup visible to all observers. */
> +       smp_rmb();
> +
> +       arch_send_wakeup_ipi_mask(cpumask_of(cpu));
> +       timeout  = jiffies + (HZ * 1);
> +       while (time_before(jiffies, timeout)) {
> +               /* make sure we see any writes to pen_release. */
> +               smp_rmb();
> +               if (pen_release == -1)
> +                       break;
> +
> +               udelay(10);
> +       }
> +
> +       /*
> +        * now the secondary core is starting up let it run its
> +        * calibrations, then wait for it to finish
> +        */
> +       spin_unlock(&boot_lock);
> +
> +       return pen_release != -1 ? -EIO : 0;
> +}
> +
> +
> +static void __init npcm7xx_wakeup_secondary(void)
> +{
> +       /*
> +        * write the address of secondary startup into the backup ram register
> +        * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the
> +        * backup ram register at offset 0x1FF0, which is what boot rom code
> +        * is waiting for. This would wake up the secondary core from WFE
> +        */
> +       iowrite32(virt_to_phys(npcm7xx_secondary_startup), gcr_base +
> +                 NPCM7XX_SCRPAD_REG);
> +       /* make sure npcm7xx_secondary_startup is seen by all observers. */
> +       smp_wmb();
> +       dsb_sev();
> +
> +       /* make sure write buffer is drained */
> +       mb();
> +}
> +
> +static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
> +{
> +       struct device_node *gcr_np, *scu_np;
> +
> +       gcr_np = of_find_compatible_node(NULL, NULL, "nuvoton,npcm750-gcr");
> +       if (!gcr_np) {
> +               pr_err("no gcr device node\n");
> +               return;
> +       }
> +       gcr_base = of_iomap(gcr_np, 0);
> +       if (!gcr_base) {
> +               pr_err("could not iomap gcr at: 0x%llx\n", gcr_base);
> +               return;
> +       }
> +
> +       scu_np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
> +       if (!scu_np) {
> +               pr_err("no scu device node\n");
> +               return;
> +       }
> +       scu_base = of_iomap(scu_np, 0);
> +       if (!scu_base) {
> +               pr_err("could not iomap gcr at: 0x%llx\n", scu_base);
> +               return;
> +       }
> +
> +       scu_enable(scu_base);
> +       npcm7xx_wakeup_secondary();
> +}
> +
> +static struct smp_operations npcm7xx_smp_ops __initdata = {
> +       .smp_prepare_cpus = npcm7xx_smp_prepare_cpus,
> +       .smp_boot_secondary = npcm7xx_smp_boot_secondary,
> +       .smp_secondary_init = npcm7xx_smp_secondary_init,
> +};
> +
> +CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm7xx-smp", &npcm7xx_smp_ops);
> --
> 2.14.1.581.gf28d330327-goog
>

Reviewed-by: Tomer Maimon <tmaimon77@xxxxxxxxx>
Tested-by: Tomer Maimon <tmaimon77@xxxxxxxxx>

Reviewed-by: Avi Fishman <avifishman70@xxxxxxxxx>
Tested-by: Avi Fishman <avifishman70@xxxxxxxxx>
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