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Date: Mon, 23 Dec 2013 16:39:51 -0800
From: Stephen Boyd <sboyd@...eaurora.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Rohit Vaswani <rvaswani@...eaurora.org>,
David Brown <davidb@...eaurora.org>,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Arnd Bergmann <arnd@...db.de>,
Russell King <linux@....linux.org.uk>
Subject: [PATCH v2 7/9] ARM: msm: Add SMP support for KPSSv1
From: Rohit Vaswani <rvaswani@...eaurora.org>
Implement support for the Krait CPU release sequence when the
CPUs are part of the first version of the krait processor
subsystem.
Signed-off-by: Rohit Vaswani <rvaswani@...eaurora.org>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
arch/arm/mach-msm/platsmp.c | 106 +++++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-msm/scm-boot.h | 8 ++--
2 files changed, 111 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index 11c6239..4b13cd8 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -30,6 +30,16 @@
#define SCSS_CPU1CORE_RESET 0x2d80
#define SCSS_DBG_STATUS_CORE_PWRDUP 0x2e64
+#define APCS_CPU_PWR_CTL 0x04
+#define PLL_CLAMP BIT(8)
+#define CORE_PWRD_UP BIT(7)
+#define COREPOR_RST BIT(5)
+#define CORE_RST BIT(4)
+#define L2DT_SLP BIT(3)
+#define CLAMP BIT(0)
+
+#define APCS_SAW2_VCTL 0x14
+
extern void secondary_startup(void);
static DEFINE_SPINLOCK(boot_lock);
@@ -68,6 +78,85 @@ static int scss_release_secondary(unsigned int cpu)
return 0;
}
+static int kpssv1_release_secondary(unsigned int cpu)
+{
+ int ret = 0;
+ void __iomem *reg, *saw_reg;
+ struct device_node *cpu_node, *acc_node, *saw_node;
+ u32 val;
+
+ cpu_node = of_get_cpu_node(cpu, NULL);
+ if (!cpu_node)
+ return -ENODEV;
+
+ acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
+ if (!acc_node) {
+ ret = -ENODEV;
+ goto out_acc;
+ }
+
+ saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
+ if (!saw_node) {
+ ret = -ENODEV;
+ goto out_saw;
+ }
+
+ reg = of_iomap(acc_node, 0);
+ if (!reg) {
+ ret = -ENOMEM;
+ goto out_acc_map;
+ }
+
+ saw_reg = of_iomap(saw_node, 0);
+ if (!saw_reg) {
+ ret = -ENOMEM;
+ goto out_saw_map;
+ }
+
+ /* Turn on CPU rail */
+ writel_relaxed(0xA4, saw_reg + APCS_SAW2_VCTL);
+ mb();
+ udelay(512);
+
+ /* Krait bring-up sequence */
+ val = PLL_CLAMP | L2DT_SLP | CLAMP;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ val &= ~L2DT_SLP;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ mb();
+ ndelay(300);
+
+ val |= COREPOR_RST;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ mb();
+ udelay(2);
+
+ val &= ~CLAMP;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ mb();
+ udelay(2);
+
+ val &= ~COREPOR_RST;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ mb();
+ udelay(100);
+
+ val |= CORE_PWRD_UP;
+ writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+ mb();
+
+ iounmap(saw_reg);
+out_saw_map:
+ iounmap(reg);
+out_acc_map:
+ of_node_put(saw_node);
+out_saw:
+ of_node_put(acc_node);
+out_acc:
+ of_node_put(cpu_node);
+ return ret;
+}
+
static DEFINE_PER_CPU(int, cold_boot_done);
static int msm_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
@@ -107,6 +196,11 @@ static int msm8660_boot_secondary(unsigned int cpu, struct task_struct *idle)
return msm_boot_secondary(cpu, scss_release_secondary);
}
+static int kpssv1_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ return msm_boot_secondary(cpu, kpssv1_release_secondary);
+}
+
static void __init msm_smp_prepare_cpus(unsigned int max_cpus)
{
int cpu, map;
@@ -114,6 +208,8 @@ static void __init msm_smp_prepare_cpus(unsigned int max_cpus)
static const int cold_boot_flags[] = {
0,
SCM_FLAG_COLDBOOT_CPU1,
+ SCM_FLAG_COLDBOOT_CPU2,
+ SCM_FLAG_COLDBOOT_CPU3,
};
for_each_present_cpu(cpu) {
@@ -144,3 +240,13 @@ static struct smp_operations msm_smp_8660_ops __initdata = {
#endif
};
CPU_METHOD_OF_DECLARE(msm_smp, "qcom,gcc-msm8660", &msm_smp_8660_ops);
+
+static struct smp_operations msm_smp_kpssv1_ops __initdata = {
+ .smp_prepare_cpus = msm_smp_prepare_cpus,
+ .smp_secondary_init = msm_secondary_init,
+ .smp_boot_secondary = kpssv1_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = msm_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(msm_smp_kpssv1, "qcom,kpss-acc-v1", &msm_smp_kpssv1_ops);
diff --git a/arch/arm/mach-msm/scm-boot.h b/arch/arm/mach-msm/scm-boot.h
index 7be32ff..6aabb24 100644
--- a/arch/arm/mach-msm/scm-boot.h
+++ b/arch/arm/mach-msm/scm-boot.h
@@ -13,9 +13,11 @@
#define __MACH_SCM_BOOT_H
#define SCM_BOOT_ADDR 0x1
-#define SCM_FLAG_COLDBOOT_CPU1 0x1
-#define SCM_FLAG_WARMBOOT_CPU1 0x2
-#define SCM_FLAG_WARMBOOT_CPU0 0x4
+#define SCM_FLAG_COLDBOOT_CPU1 0x01
+#define SCM_FLAG_COLDBOOT_CPU2 0x08
+#define SCM_FLAG_COLDBOOT_CPU3 0x20
+#define SCM_FLAG_WARMBOOT_CPU0 0x04
+#define SCM_FLAG_WARMBOOT_CPU1 0x02
int scm_set_boot_addr(phys_addr_t addr, int flags);
--
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hosted by The Linux Foundation
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