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Message-ID: <CAF0Txbpy-oeTkdotDVcoFUu50F7OLvxv_1PKwwxVb_UBmfnOmA@mail.gmail.com>
Date: Fri, 27 Jan 2012 11:28:47 +0530
From: Murali N <nalajala.murali@...il.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>
Cc: Russell King <linux@....linux.org.uk>,
Gary King <gking@...dia.com>, Arnd Bergmann <arnd@...db.de>,
linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
Colin Cross <ccross@...roid.com>,
Olof Johansson <olof@...om.net>,
Stephen Warren <swarren@...dia.com>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 8/8] ARM: tegra: support for secondary cores on Tegra30
On Thu, Jan 26, 2012 at 10:37 PM, Peter De Schrijver
<pdeschrijver@...dia.com> wrote:
>
> Add support for bringing up secondary cores on Tegra30. On Tegra30 secondary
> CPU cores are powergated, so we need to turn on the domains before we can bring
> the CPU cores online. Bringing secondary cores online happens early during the
> ssytem boot, so we call powergating initialization from platform early_init
small spelling correction "system"
> function.
>
> Based on work by:
>
> Scott Williams <scwilliams@...dia.com>
> Colin Cross <ccross@...roid.com>
> Alex Frid <afrid@...dia.com>
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
> arch/arm/mach-tegra/headsmp.S | 32 +++++++++++++++++++++++++
> arch/arm/mach-tegra/platsmp.c | 52 ++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 83 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-tegra/headsmp.S b/arch/arm/mach-tegra/headsmp.S
> index bb13e22..925c4a0 100644
> --- a/arch/arm/mach-tegra/headsmp.S
> +++ b/arch/arm/mach-tegra/headsmp.S
> @@ -188,6 +188,38 @@ __die:
> str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
> #endif
> 1:
> +#ifdef CONFIG_ARCH_TEGRA_3x_SOC
> + mov32 r6, TEGRA_FLOW_CTRL_BASE
> +
> + cmp r10, #0
> + moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
> + moveq r2, #FLOW_CTRL_CPU0_CSR
> + movne r1, r10, lsl #3
> + addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
> + addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
> +
> + /* Clear CPU "event" and "interrupt" flags and power gate
> + it when halting but not before it is in the "WFI" state. */
> + ldr r0, [r6, +r2]
> + orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
> + orr r0, r0, #FLOW_CTRL_CSR_ENABLE
> + str r0, [r6, +r2]
> +
> + /* Unconditionally halt this CPU */
> + mov r0, #FLOW_CTRL_WAITEVENT
> + str r0, [r6, +r1]
> + ldr r0, [r6, +r1] @ memory barrier
> +
> + dsb
> + isb
> + wfi @ CPU should be power gated here
> +
> + /* If the CPU didn't power gate above just kill it's clock. */
> +
> + mov r0, r11, lsl #8
> + str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
> +#endif
> +
> /* If the CPU still isn't dead, just spin here. */
> b .
> ENDPROC(__tegra_cpu_reset_handler)
> diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
> index fa1178d..672a751 100644
> --- a/arch/arm/mach-tegra/platsmp.c
> +++ b/arch/arm/mach-tegra/platsmp.c
> @@ -24,7 +24,9 @@
> #include <asm/mach-types.h>
> #include <asm/smp_scu.h>
>
> +#include <mach/clk.h>
> #include <mach/iomap.h>
> +#include <mach/powergate.h>
>
> #include "chipid.h"
> #include "flowctrl.h"
> @@ -42,6 +44,8 @@ static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE);
> (IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x340)
> #define CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR \
> (IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x344)
> +#define CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR \
> + (IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x34c)
>
> #define CPU_CLOCK(cpu) (0x1<<(8+cpu))
> #define CPU_RESET(cpu) (0x1111ul<<(cpu))
> @@ -73,11 +77,54 @@ static int tegra20_power_up_cpu(unsigned int cpu)
> return 0;
> }
>
> +static int tegra30_power_up_cpu(unsigned int cpu)
> +{
> + u32 reg;
> + int ret, pwrgateid;
> + unsigned long timeout;
> +
> + pwrgateid = tegra_cpu_powergate_id(cpu);
> + if (pwrgateid < 0)
> + return pwrgateid;
> +
> + /* If this is the first boot, toggle powergates directly. */
> + if (!tegra_powergate_is_powered(pwrgateid)) {
> + ret = tegra_powergate_power_on(pwrgateid);
> + if (ret)
> + return ret;
> +
> + /* Wait for the power to come up. */
> + timeout = jiffies + 10*HZ;
> + do {
> + if (tegra_powergate_is_powered(pwrgateid))
> + goto remove_clamps;
> + udelay(10);
> + } while (time_before(jiffies, timeout));
> + return -ETIMEDOUT;
> + }
> +
> +remove_clamps:
> + /* CPU partition is powered. Enable the CPU clock. */
> + writel(CPU_CLOCK(cpu), CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR);
> + reg = readl(CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR);
> + udelay(10);
> +
> + /* Remove I/O clamps. */
> + ret = tegra_powergate_remove_clamping(pwrgateid);
> + udelay(10);
> +
> + /* Clear flow controller CSR. */
> + flowctrl_write_cpu_csr(cpu, 0);
> +
> + return 0;
> +}
> +
> int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
> {
> int status;
>
> - /* Force the CPU into reset. The CPU must remain in reset when the
> + /*
> + * Force the CPU into reset. The CPU must remain in reset when the
> * flow controller state is cleared (which will cause the flow
> * controller to stop driving reset if the CPU has been power-gated
> * via the flow controller). This will have no effect on first boot
> @@ -98,6 +145,9 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
> case TEGRA20:
> status = tegra20_power_up_cpu(cpu);
> break;
> + case TEGRA30:
> + status = tegra30_power_up_cpu(cpu);
> + break;
> default:
> status = -EINVAL;
> break;
> --
> 1.7.7.rc0.72.g4b5ea.dirty
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
Regards,
Murali N
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