From 9fbbe6890c88aa332efe61d5894108dd8b932530 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 6 Sep 2011 14:39:44 +0800 Subject: arm/imx6q: add core drivers clock, gpc, mmdc and src It adds a number of core drivers support for imx6q, including clock, General Power Controller (gpc), Multi Mode DDR Controller(mmdc) and System Reset Controller (src). Signed-off-by: Ranjani Vaidyanathan Signed-off-by: Shawn Guo --- arch/arm/mach-imx/gpc.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 arch/arm/mach-imx/gpc.c (limited to 'arch/arm/mach-imx/gpc.c') diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c new file mode 100644 index 000000000000..e1537f9e45b8 --- /dev/null +++ b/arch/arm/mach-imx/gpc.c @@ -0,0 +1,113 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include +#include +#include + +#define GPC_IMR1 0x008 +#define GPC_PGC_CPU_PDN 0x2a0 + +#define IMR_NUM 4 + +static void __iomem *gpc_base; +static u32 gpc_wake_irqs[IMR_NUM]; +static u32 gpc_saved_imrs[IMR_NUM]; + +void imx_gpc_pre_suspend(void) +{ + void __iomem *reg_imr1 = gpc_base + GPC_IMR1; + int i; + + /* Tell GPC to power off ARM core when suspend */ + writel_relaxed(0x1, gpc_base + GPC_PGC_CPU_PDN); + + for (i = 0; i < IMR_NUM; i++) { + gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); + writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4); + } +} + +void imx_gpc_post_resume(void) +{ + void __iomem *reg_imr1 = gpc_base + GPC_IMR1; + int i; + + /* Keep ARM core powered on for other low-power modes */ + writel_relaxed(0x0, gpc_base + GPC_PGC_CPU_PDN); + + for (i = 0; i < IMR_NUM; i++) + writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4); +} + +static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on) +{ + unsigned int idx = d->irq / 32 - 1; + u32 mask; + + /* Sanity check for SPI irq */ + if (d->irq < 32) + return -EINVAL; + + mask = 1 << d->irq % 32; + gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask : + gpc_wake_irqs[idx] & ~mask; + + return 0; +} + +static void imx_gpc_irq_unmask(struct irq_data *d) +{ + void __iomem *reg; + u32 val; + + /* Sanity check for SPI irq */ + if (d->irq < 32) + return; + + reg = gpc_base + GPC_IMR1 + (d->irq / 32 - 1) * 4; + val = readl_relaxed(reg); + val &= ~(1 << d->irq % 32); + writel_relaxed(val, reg); +} + +static void imx_gpc_irq_mask(struct irq_data *d) +{ + void __iomem *reg; + u32 val; + + /* Sanity check for SPI irq */ + if (d->irq < 32) + return; + + reg = gpc_base + GPC_IMR1 + (d->irq / 32 - 1) * 4; + val = readl_relaxed(reg); + val |= 1 << (d->irq % 32); + writel_relaxed(val, reg); +} + +void __init imx_gpc_init(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc"); + gpc_base = of_iomap(np, 0); + WARN_ON(!gpc_base); + + /* Register GPC as the secondary interrupt controller behind GIC */ + gic_arch_extn.irq_mask = imx_gpc_irq_mask; + gic_arch_extn.irq_unmask = imx_gpc_irq_unmask; + gic_arch_extn.irq_set_wake = imx_gpc_irq_set_wake; +} -- cgit v1.2.3