diff options
Diffstat (limited to 'recipes/linux/linux-kirkwood/0002--ARM-Kirkwood-peripherals-clock-gating-for-power-m.patch')
| -rw-r--r-- | recipes/linux/linux-kirkwood/0002--ARM-Kirkwood-peripherals-clock-gating-for-power-m.patch | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/recipes/linux/linux-kirkwood/0002--ARM-Kirkwood-peripherals-clock-gating-for-power-m.patch b/recipes/linux/linux-kirkwood/0002--ARM-Kirkwood-peripherals-clock-gating-for-power-m.patch new file mode 100644 index 0000000000..b1c7f7ce00 --- /dev/null +++ b/recipes/linux/linux-kirkwood/0002--ARM-Kirkwood-peripherals-clock-gating-for-power-m.patch @@ -0,0 +1,131 @@ +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") |