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From 17589962c1787310e6373478a9fcb7641184cd91 Mon Sep 17 00:00:00 2001
From: Rabeeh Khoury <rabeeh@marvell.com>
Date: Sun, 22 Mar 2009 17:30:32 +0200
Subject: [PATCH] [ARM] Kirkwood: peripherals clock gating for power management
1. Enabling clock gating of unused peripherals
2. PLL and PHY of the units are also disabled (when possible.
Signed-off-by: Rabeeh Khoury <rabeeh@marvell.com>
[ This needs to be revisited to make power handling dynamic and
per device. -- Nico ]
---
arch/arm/mach-kirkwood/common.c | 32 ++++++++++++++++++++++++
arch/arm/mach-kirkwood/common.h | 1 +
arch/arm/mach-kirkwood/include/mach/kirkwood.h | 23 +++++++++++++++++
arch/arm/mach-kirkwood/sheevaplug-setup.c | 2 +
4 files changed, 58 insertions(+), 0 deletions(-)
Index: git/arch/arm/mach-kirkwood/common.c
===================================================================
--- git.orig/arch/arm/mach-kirkwood/common.c
+++ git/arch/arm/mach-kirkwood/common.c
@@ -779,6 +779,38 @@ static void __init kirkwood_l2_init(void
#endif
}
+void __init kirkwood_clock_gate(u32 reg)
+{
+ printk(KERN_INFO "Kirkwood: Gating clock using mask 0x%x\n", reg);
+ /* First make sure that the units are accessible */
+ writel(readl(CLOCK_GATING_CTRL) | reg, CLOCK_GATING_CTRL);
+ /* For SATA first shutdown the phy */
+ if (reg & CGC_SATA0) {
+ /* Disable PLL and IVREF */
+ writel(readl(SATA0_PHY_MODE_2) & ~0xf, SATA0_PHY_MODE_2);
+ /* Disable PHY */
+ writel(readl(SATA0_IF_CTRL) | 0x200, SATA0_IF_CTRL);
+ }
+ if (reg & CGC_SATA1) {
+ /* Disable PLL and IVREF */
+ writel(readl(SATA1_PHY_MODE_2) & ~0xf, SATA1_PHY_MODE_2);
+ /* Disable PHY */
+ writel(readl(SATA1_IF_CTRL) | 0x200, SATA1_IF_CTRL);
+ }
+ /* For PCI-E first shutdown the phy */
+ if (reg & CGC_PEX0) {
+ writel(readl(PCIE_LINK_CTRL) | 0x10, PCIE_LINK_CTRL);
+ while (1) {
+ if (readl(PCIE_STATUS) & 0x1)
+ break;
+ }
+ writel(readl(PCIE_LINK_CTRL) & ~0x10, PCIE_LINK_CTRL);
+ }
+ /* Now gate clock the required units */
+ writel(readl(CLOCK_GATING_CTRL) & ~reg, CLOCK_GATING_CTRL);
+ return;
+}
+
void __init kirkwood_init(void)
{
printk(KERN_INFO "Kirkwood: %s, TCLK=%d.\n",
Index: git/arch/arm/mach-kirkwood/common.h
===================================================================
--- git.orig/arch/arm/mach-kirkwood/common.h
+++ git/arch/arm/mach-kirkwood/common.h
@@ -22,6 +22,7 @@ struct mvsdio_platform_data;
void kirkwood_map_io(void);
void kirkwood_init(void);
void kirkwood_init_irq(void);
+void __init kirkwood_clock_gate(u32 reg);
extern struct mbus_dram_target_info kirkwood_mbus_dram_info;
void kirkwood_setup_cpu_mbus(void);
Index: git/arch/arm/mach-kirkwood/include/mach/kirkwood.h
===================================================================
--- git.orig/arch/arm/mach-kirkwood/include/mach/kirkwood.h
+++ git/arch/arm/mach-kirkwood/include/mach/kirkwood.h
@@ -65,6 +65,8 @@
#define BRIDGE_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x20000)
#define PCIE_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x40000)
+#define PCIE_LINK_CTRL (PCIE_VIRT_BASE | 0x70)
+#define PCIE_STATUS (PCIE_VIRT_BASE | 0x1a04)
#define USB_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE | 0x50000)
@@ -81,9 +83,30 @@
#define GE01_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE | 0x74000)
#define SATA_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE | 0x80000)
+#define SATA_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x80000)
+#define SATA0_IF_CTRL (SATA_VIRT_BASE | 0x2050)
+#define SATA0_PHY_MODE_2 (SATA_VIRT_BASE | 0x2330)
+#define SATA1_IF_CTRL (SATA_VIRT_BASE | 0x4050)
+#define SATA1_PHY_MODE_2 (SATA_VIRT_BASE | 0x4330)
#define SDIO_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE | 0x90000)
+#define CLOCK_GATING_CTRL (BRIDGE_VIRT_BASE | 0x11c)
+#define CGC_GE0 0x1
+#define CGC_PEX0 0x4
+#define CGC_USB0 0x8
+#define CGC_SDIO 0x10
+#define CGC_TSU 0x20
+#define CGC_NAND_SPI 0x80
+#define CGC_XOR0 0x100
+#define CGC_AUDIO 0x200
+#define CGC_SATA0 0x4000
+#define CGC_SATA1 0x8000
+#define CGC_XOR1 0x10000
+#define CGC_CRYPTO 0x20000
+#define CGC_GE1 0x80000
+#define CGC_TDM 0x100000
+
/*
* Supported devices and revisions.
*/
Index: git/arch/arm/mach-kirkwood/sheevaplug-setup.c
===================================================================
--- git.orig/arch/arm/mach-kirkwood/sheevaplug-setup.c
+++ git/arch/arm/mach-kirkwood/sheevaplug-setup.c
@@ -122,6 +122,8 @@ static void __init sheevaplug_init(void)
platform_device_register(&sheevaplug_nand_flash);
platform_device_register(&sheevaplug_leds);
+ kirkwood_clock_gate(CGC_PEX0 | CGC_TSU | CGC_AUDIO | CGC_SATA0 |\
+ CGC_SATA1 | CGC_CRYPTO | CGC_GE1 | CGC_TDM);
}
MACHINE_START(SHEEVAPLUG, "Marvell SheevaPlug Reference Board")
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