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Date: Fri, 1 Nov 2013 15:08:57 -0700
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
Subject: [PATCH 09/11] ARM: msm: Add SMP support for KPSSv2
From: Rohit Vaswani <rvaswani@...eaurora.org>
Implement support for the Krait CPU release sequence when the
CPUs are part of the second 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 | 86 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index e187c6e..87e4fdc 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -32,8 +32,10 @@
#define SCSS_DBG_STATUS_CORE_PWRDUP 0x2e64
#define APCS_CPU_PWR_CTL 0x04
+#define APC_PWR_GATE_CTL 0x14
#define APCS_SAW2_VCTL 0x14
+#define L2_SAW2_VCTL 0x1c
extern void secondary_startup(void);
@@ -119,6 +121,89 @@ static int kpssv1_release_secondary(struct device_node *node, unsigned int cpu)
return 0;
}
+static int kpssv2_release_secondary(struct device_node *node, unsigned int cpu)
+{
+ u32 off;
+ struct resource res;
+ void __iomem *reg;
+ struct device_node *l2_node;
+ void __iomem *l2_saw_base;
+ unsigned reg_val;
+ int err;
+
+ if (of_property_read_u32(node, "cpu-offset", &off))
+ return -EINVAL;
+
+ if (of_address_to_resource(node, 0, &res))
+ return -EINVAL;
+
+ l2_node = of_find_compatible_node(NULL, NULL, "qcom,l2-saw2");
+ if (!l2_node)
+ return -ENODEV;
+
+ reg = ioremap(res.start + off + (SZ_64K * cpu), resource_size(&res));
+ if (!reg) {
+ err = -ENOMEM;
+ goto err_map;
+ }
+
+ l2_saw_base = of_iomap(l2_node, 0);
+ if (!l2_saw_base) {
+ err = -ENOMEM;
+ goto err_l2_map;
+ }
+
+ /* 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 */
+ writel_relaxed(0x10003, l2_saw_base + L2_SAW2_VCTL);
+ mb();
+ udelay(50);
+
+ iounmap(l2_saw_base);
+
+ writel_relaxed(0x021, reg + APCS_CPU_PWR_CTL);
+ mb();
+ udelay(2);
+
+ writel_relaxed(0x020, reg + APCS_CPU_PWR_CTL);
+ mb();
+ udelay(2);
+
+ writel_relaxed(0x000, reg + APCS_CPU_PWR_CTL);
+ mb();
+
+ writel_relaxed(0x080, reg + APCS_CPU_PWR_CTL);
+ mb();
+
+ err = 0;
+err_l2_map:
+ iounmap(reg);
+err_map:
+ of_node_put(l2_node);
+ return err;
+}
+
static DEFINE_PER_CPU(int, cold_boot_done);
static int boot_cold_cpu(unsigned int cpu)
@@ -131,6 +216,7 @@ static int boot_cold_cpu(unsigned int cpu)
static const struct of_device_id match_table[] = {
M("qcom,gcc-8660", scss_release_secondary),
M("qcom,kpss-acc-v1", kpssv1_release_secondary),
+ M("qcom,kpss-acc-v2", kpssv2_release_secondary),
};
#undef M
--
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