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Merge tag 'ux500-multiplatform-mfd' of git://git.kernel.org/pub/scm/l…
…inux/kernel/git/linusw/linux-stericsson MFD portions of the ux500 multiplatform branch. A second tag for the ARM SoC tree will build upon this one. This mainly removes the header file dependencies from the PRCMU driver in the MFD subsystem, and moves the PM functions to the machine. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| /* | ||
| * Copyright (C) ST-Ericsson SA 2010-2013 | ||
| * Author: Rickard Andersson <rickard.andersson@stericsson.com> for | ||
| * ST-Ericsson. | ||
| * Author: Daniel Lezcano <daniel.lezcano@linaro.org> for Linaro. | ||
| * License terms: GNU General Public License (GPL) version 2 | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/irqchip/arm-gic.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/io.h> | ||
| #include <linux/platform_data/arm-ux500-pm.h> | ||
|
|
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| #include <mach/hardware.h> | ||
|
|
||
| /* ARM WFI Standby signal register */ | ||
| #define PRCM_ARM_WFI_STANDBY (prcmu_base + 0x130) | ||
| #define PRCM_ARM_WFI_STANDBY_WFI0 0x08 | ||
| #define PRCM_ARM_WFI_STANDBY_WFI1 0x10 | ||
| #define PRCM_IOCR (prcmu_base + 0x310) | ||
| #define PRCM_IOCR_IOFORCE 0x1 | ||
|
|
||
| /* Dual A9 core interrupt management unit registers */ | ||
| #define PRCM_A9_MASK_REQ (prcmu_base + 0x328) | ||
| #define PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ 0x1 | ||
|
|
||
| #define PRCM_A9_MASK_ACK (prcmu_base + 0x32c) | ||
| #define PRCM_ARMITMSK31TO0 (prcmu_base + 0x11c) | ||
| #define PRCM_ARMITMSK63TO32 (prcmu_base + 0x120) | ||
| #define PRCM_ARMITMSK95TO64 (prcmu_base + 0x124) | ||
| #define PRCM_ARMITMSK127TO96 (prcmu_base + 0x128) | ||
| #define PRCM_POWER_STATE_VAL (prcmu_base + 0x25C) | ||
| #define PRCM_ARMITVAL31TO0 (prcmu_base + 0x260) | ||
| #define PRCM_ARMITVAL63TO32 (prcmu_base + 0x264) | ||
| #define PRCM_ARMITVAL95TO64 (prcmu_base + 0x268) | ||
| #define PRCM_ARMITVAL127TO96 (prcmu_base + 0x26C) | ||
|
|
||
| static void __iomem *prcmu_base; | ||
|
|
||
| /* This function decouple the gic from the prcmu */ | ||
| int prcmu_gic_decouple(void) | ||
| { | ||
| u32 val = readl(PRCM_A9_MASK_REQ); | ||
|
|
||
| /* Set bit 0 register value to 1 */ | ||
| writel(val | PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, | ||
| PRCM_A9_MASK_REQ); | ||
|
|
||
| /* Make sure the register is updated */ | ||
| readl(PRCM_A9_MASK_REQ); | ||
|
|
||
| /* Wait a few cycles for the gic mask completion */ | ||
| udelay(1); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| /* This function recouple the gic with the prcmu */ | ||
| int prcmu_gic_recouple(void) | ||
| { | ||
| u32 val = readl(PRCM_A9_MASK_REQ); | ||
|
|
||
| /* Set bit 0 register value to 0 */ | ||
| writel(val & ~PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, PRCM_A9_MASK_REQ); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| #define PRCMU_GIC_NUMBER_REGS 5 | ||
|
|
||
| /* | ||
| * This function checks if there are pending irq on the gic. It only | ||
| * makes sense if the gic has been decoupled before with the | ||
| * db8500_prcmu_gic_decouple function. Disabling an interrupt only | ||
| * disables the forwarding of the interrupt to any CPU interface. It | ||
| * does not prevent the interrupt from changing state, for example | ||
| * becoming pending, or active and pending if it is already | ||
| * active. Hence, we have to check the interrupt is pending *and* is | ||
| * active. | ||
| */ | ||
| bool prcmu_gic_pending_irq(void) | ||
| { | ||
| u32 pr; /* Pending register */ | ||
| u32 er; /* Enable register */ | ||
| void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE); | ||
| int i; | ||
|
|
||
| /* 5 registers. STI & PPI not skipped */ | ||
| for (i = 0; i < PRCMU_GIC_NUMBER_REGS; i++) { | ||
|
|
||
| pr = readl_relaxed(dist_base + GIC_DIST_PENDING_SET + i * 4); | ||
| er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); | ||
|
|
||
| if (pr & er) | ||
| return true; /* There is a pending interrupt */ | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| /* | ||
| * This function checks if there are pending interrupt on the | ||
| * prcmu which has been delegated to monitor the irqs with the | ||
| * db8500_prcmu_copy_gic_settings function. | ||
| */ | ||
| bool prcmu_pending_irq(void) | ||
| { | ||
| u32 it, im; | ||
| int i; | ||
|
|
||
| for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) { | ||
| it = readl(PRCM_ARMITVAL31TO0 + i * 4); | ||
| im = readl(PRCM_ARMITMSK31TO0 + i * 4); | ||
| if (it & im) | ||
| return true; /* There is a pending interrupt */ | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| /* | ||
| * This function checks if the specified cpu is in in WFI. It's usage | ||
| * makes sense only if the gic is decoupled with the db8500_prcmu_gic_decouple | ||
| * function. Of course passing smp_processor_id() to this function will | ||
| * always return false... | ||
| */ | ||
| bool prcmu_is_cpu_in_wfi(int cpu) | ||
| { | ||
| return readl(PRCM_ARM_WFI_STANDBY) & cpu ? PRCM_ARM_WFI_STANDBY_WFI1 : | ||
| PRCM_ARM_WFI_STANDBY_WFI0; | ||
| } | ||
|
|
||
| /* | ||
| * This function copies the gic SPI settings to the prcmu in order to | ||
| * monitor them and abort/finish the retention/off sequence or state. | ||
| */ | ||
| int prcmu_copy_gic_settings(void) | ||
| { | ||
| u32 er; /* Enable register */ | ||
| void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE); | ||
| int i; | ||
|
|
||
| /* We skip the STI and PPI */ | ||
| for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) { | ||
| er = readl_relaxed(dist_base + | ||
| GIC_DIST_ENABLE_SET + (i + 1) * 4); | ||
| writel(er, PRCM_ARMITMSK31TO0 + i * 4); | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| void __init ux500_pm_init(u32 phy_base, u32 size) | ||
| { | ||
| prcmu_base = ioremap(phy_base, size); | ||
| if (!prcmu_base) { | ||
| pr_err("could not remap PRCMU for PM functions\n"); | ||
| return; | ||
| } | ||
| /* | ||
| * On watchdog reboot the GIC is in some cases decoupled. | ||
| * This will make sure that the GIC is correctly configured. | ||
| */ | ||
| prcmu_gic_recouple(); | ||
| } |
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