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Subject[RESEND PATCH 4/4] ARM: msm: Add support for 8974 SMP
Date
Add the cpus bindings and the Kraitv2 release sequence
to make SMP work for 2 cores on MSM8974.

Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
---
Documentation/devicetree/bindings/arm/cpus.txt | 1 +
arch/arm/boot/dts/msm8974.dts | 23 ++++++++
arch/arm/mach-msm/board-dt-8974.c | 3 +
arch/arm/mach-msm/platsmp.c | 79 ++++++++++++++++++++++++++
4 files changed, 106 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 1132eac..7c3c677 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -52,6 +52,7 @@ For the ARM architecture every CPU node must contain the following properties:
This should be one of:
"qcom,scss"
"qcom,kpssv1"
+ "qcom,kpssv2"

Example:

diff --git a/arch/arm/boot/dts/msm8974.dts b/arch/arm/boot/dts/msm8974.dts
index c31c097..ef35a9b 100644
--- a/arch/arm/boot/dts/msm8974.dts
+++ b/arch/arm/boot/dts/msm8974.dts
@@ -7,6 +7,22 @@
compatible = "qcom,msm8974";
interrupt-parent = <&intc>;

+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "qcom,krait";
+ device_type = "cpu";
+ enable-method = "qcom,kpssv2";
+
+ cpu@0 {
+ reg = <0>;
+ };
+
+ cpu@1 {
+ reg = <1>;
+ };
+ };
+
intc: interrupt-controller@f9000000 {
compatible = "qcom,msm-qgic2";
interrupt-controller;
@@ -23,4 +39,11 @@
<1 1 0xf08>;
clock-frequency = <19200000>;
};
+
+ kpss@f9012000 {
+ compatible = "qcom,kpss";
+ reg = <0xf9012000 0x1000>,
+ <0xf9088000 0x1000>,
+ <0xf9098000 0x1000>;
+ };
};
diff --git a/arch/arm/mach-msm/board-dt-8974.c b/arch/arm/mach-msm/board-dt-8974.c
index d7f84f2..06119f9 100644
--- a/arch/arm/mach-msm/board-dt-8974.c
+++ b/arch/arm/mach-msm/board-dt-8974.c
@@ -13,11 +13,14 @@
#include <linux/of_platform.h>
#include <asm/mach/arch.h>

+#include "common.h"
+
static const char * const msm8974_dt_match[] __initconst = {
"qcom,msm8974",
NULL
};

DT_MACHINE_START(MSM8974_DT, "Qualcomm MSM (Flattened Device Tree)")
+ .smp = smp_ops(msm_smp_ops),
.dt_compat = msm8974_dt_match,
MACHINE_END
diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index 82eb079..0fdae69 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -124,6 +124,80 @@ static int msm8960_release_secondary(unsigned int cpu)
return 0;
}

+static int msm8974_release_secondary(unsigned int cpu)
+{
+ void __iomem *reg;
+ void __iomem *l2_saw_base;
+ struct device_node *dn = NULL;
+ unsigned apc_pwr_gate_ctl = 0x14;
+ unsigned reg_val;
+
+ if (cpu == 0 || cpu >= num_possible_cpus())
+ return -EINVAL;
+
+ dn = of_find_compatible_node(dn, NULL, "qcom,kpss");
+ if (!dn) {
+ pr_err("%s : Missing kpss node from device tree\n", __func__);
+ return -ENXIO;
+ }
+
+ reg = of_iomap(dn, cpu+1);
+ if (!reg)
+ return -ENOMEM;
+
+ pr_debug("Starting secondary CPU %d\n", cpu);
+
+ /* Turn on the BHS, turn off LDO Bypass and power down LDO */
+ reg_val = 0x403f0001;
+ writel_relaxed(reg_val, reg + apc_pwr_gate_ctl);
+
+ /* complete the above write before the delay */
+ mb();
+ /* wait for the bhs to settle */
+ udelay(1);
+
+ /* Turn on BHS segments */
+ reg_val |= 0x3f << 1;
+ writel_relaxed(reg_val, reg + apc_pwr_gate_ctl);
+
+ /* complete the above write before the delay */
+ mb();
+ /* wait for the bhs to settle */
+ udelay(1);
+
+ /* Finally turn on the bypass so that BHS supplies power */
+ reg_val |= 0x3f << 8;
+ writel_relaxed(reg_val, reg + apc_pwr_gate_ctl);
+
+ /* enable max phases */
+ l2_saw_base = of_iomap(dn, 0);
+ if (!l2_saw_base) {
+ return -ENOMEM;
+ }
+ writel_relaxed(0x10003, l2_saw_base + 0x1c);
+ mb();
+ udelay(50);
+
+ iounmap(l2_saw_base);
+
+ writel_relaxed(0x021, reg+0x04);
+ mb();
+ udelay(2);
+
+ writel_relaxed(0x020, reg+0x04);
+ mb();
+ udelay(2);
+
+ writel_relaxed(0x000, reg+0x04);
+ mb();
+
+ writel_relaxed(0x080, reg+0x04);
+ mb();
+
+ iounmap(reg);
+ return 0;
+}
+
static DEFINE_PER_CPU(int, cold_boot_done);

static void boot_cold_cpu(unsigned int cpu)
@@ -151,6 +225,11 @@ static void boot_cold_cpu(unsigned int cpu)
msm8960_release_secondary(cpu);
per_cpu(cold_boot_done, cpu) = true;
}
+ } else if (!strcmp(enable_method, "qcom,kpssv2")) {
+ if (per_cpu(cold_boot_done, cpu) == false) {
+ msm8974_release_secondary(cpu);
+ per_cpu(cold_boot_done, cpu) = true;
+ }
} else {
pr_err("%s: Invalid enable-method property: %s\n",
__func__, enable_method);
--
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