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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-02-08 13:55:25 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-02-08 13:55:25 -0800 |
commit | 469030d454bd1620c7b2651d9ec8cdcbaa74deb9 (patch) | |
tree | 829522e0cb947c63cf63efafc241c8253eed728a /arch/arm/mach-omap2/omap-iommu.c | |
parent | Merge tag 'compat-ioctl-fix' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground (diff) | |
parent | Merge tag 'omap-for-v5.6/soc-build-fix-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into arm/soc (diff) | |
download | linux-dev-469030d454bd1620c7b2651d9ec8cdcbaa74deb9.tar.xz linux-dev-469030d454bd1620c7b2651d9ec8cdcbaa74deb9.zip |
Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC platform updates from Olof Johansson:
"Most of these are smaller fixes that have accrued, and some continued
cleanup of OMAP platforms towards shared frameworks.
One new SoC from Atmel/Microchip: sam9x60"
* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (35 commits)
ARM: OMAP2+: Fix undefined reference to omap_secure_init
ARM: s3c64xx: Drop unneeded select of TIMER_OF
ARM: exynos: Drop unneeded select of MIGHT_HAVE_CACHE_L2X0
ARM: s3c24xx: Switch to atomic pwm API in rx1950
ARM: OMAP2+: sleep43xx: Call secure suspend/resume handlers
ARM: OMAP2+: Use ARM SMC Calling Convention when OP-TEE is available
ARM: OMAP2+: Introduce check for OP-TEE in omap_secure_init()
ARM: OMAP2+: Add omap_secure_init callback hook for secure initialization
ARM: at91: Documentation: add sam9x60 product and datasheet
ARM: at91: pm: use of_device_id array to find the proper shdwc node
ARM: at91: pm: use SAM9X60 PMC's compatible
ARM: imx: only select ARM_ERRATA_814220 for ARMv7-A
ARM: zynq: use physical cpuid in zynq_slcr_cpu_stop/start
ARM: tegra: Use clk_m CPU on Tegra124 LP1 resume
ARM: tegra: Modify reshift divider during LP1
ARM: tegra: Enable PLLP bypass during Tegra124 LP1
ARM: samsung: Rename Samsung and Exynos to lowercase
ARM: exynos: Correct the help text for platform Kconfig option
ARM: bcm: Select ARM_AMBA for ARCH_BRCMSTB
ARM: brcmstb: Add debug UART entry for 7216
...
Diffstat (limited to 'arch/arm/mach-omap2/omap-iommu.c')
-rw-r--r-- | arch/arm/mach-omap2/omap-iommu.c | 128 |
1 files changed, 113 insertions, 15 deletions
diff --git a/arch/arm/mach-omap2/omap-iommu.c b/arch/arm/mach-omap2/omap-iommu.c index f1a6ece8108e..54aff33e55e6 100644 --- a/arch/arm/mach-omap2/omap-iommu.c +++ b/arch/arm/mach-omap2/omap-iommu.c @@ -8,36 +8,134 @@ #include <linux/platform_device.h> #include <linux/err.h> +#include <linux/clk.h> +#include <linux/list.h> -#include "omap_hwmod.h" -#include "omap_device.h" +#include "clockdomain.h" #include "powerdomain.h" +struct pwrdm_link { + struct device *dev; + struct powerdomain *pwrdm; + struct list_head node; +}; + +static DEFINE_SPINLOCK(iommu_lock); +static struct clockdomain *emu_clkdm; +static atomic_t emu_count; + +static void omap_iommu_dra7_emu_swsup_config(struct platform_device *pdev, + bool enable) +{ + struct device_node *np = pdev->dev.of_node; + unsigned long flags; + + if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu")) + return; + + if (!emu_clkdm) { + emu_clkdm = clkdm_lookup("emu_clkdm"); + if (WARN_ON_ONCE(!emu_clkdm)) + return; + } + + spin_lock_irqsave(&iommu_lock, flags); + + if (enable && (atomic_inc_return(&emu_count) == 1)) + clkdm_deny_idle(emu_clkdm); + else if (!enable && (atomic_dec_return(&emu_count) == 0)) + clkdm_allow_idle(emu_clkdm); + + spin_unlock_irqrestore(&iommu_lock, flags); +} + +static struct powerdomain *_get_pwrdm(struct device *dev) +{ + struct clk *clk; + struct clk_hw_omap *hwclk; + struct clockdomain *clkdm; + struct powerdomain *pwrdm = NULL; + struct pwrdm_link *entry; + unsigned long flags; + static LIST_HEAD(cache); + + spin_lock_irqsave(&iommu_lock, flags); + + list_for_each_entry(entry, &cache, node) { + if (entry->dev == dev) { + pwrdm = entry->pwrdm; + break; + } + } + + spin_unlock_irqrestore(&iommu_lock, flags); + + if (pwrdm) + return pwrdm; + + clk = of_clk_get(dev->of_node->parent, 0); + if (!clk) { + dev_err(dev, "no fck found\n"); + return NULL; + } + + hwclk = to_clk_hw_omap(__clk_get_hw(clk)); + clk_put(clk); + if (!hwclk || !hwclk->clkdm_name) { + dev_err(dev, "no hwclk data\n"); + return NULL; + } + + clkdm = clkdm_lookup(hwclk->clkdm_name); + if (!clkdm) { + dev_err(dev, "clkdm not found: %s\n", hwclk->clkdm_name); + return NULL; + } + + pwrdm = clkdm_get_pwrdm(clkdm); + if (!pwrdm) { + dev_err(dev, "pwrdm not found: %s\n", clkdm->name); + return NULL; + } + + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (entry) { + entry->dev = dev; + entry->pwrdm = pwrdm; + spin_lock_irqsave(&iommu_lock, flags); + list_add(&entry->node, &cache); + spin_unlock_irqrestore(&iommu_lock, flags); + } + + return pwrdm; +} + int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev, bool request, u8 *pwrst) { struct powerdomain *pwrdm; - struct omap_device *od; u8 next_pwrst; + int ret = 0; - od = to_omap_device(pdev); - if (!od) - return -ENODEV; - - if (od->hwmods_cnt != 1) - return -EINVAL; - - pwrdm = omap_hwmod_get_pwrdm(od->hwmods[0]); + pwrdm = _get_pwrdm(&pdev->dev); if (!pwrdm) - return -EINVAL; + return -ENODEV; - if (request) + if (request) { *pwrst = pwrdm_read_next_pwrst(pwrdm); + omap_iommu_dra7_emu_swsup_config(pdev, true); + } if (*pwrst > PWRDM_POWER_RET) - return 0; + goto out; next_pwrst = request ? PWRDM_POWER_ON : *pwrst; - return pwrdm_set_next_pwrst(pwrdm, next_pwrst); + ret = pwrdm_set_next_pwrst(pwrdm, next_pwrst); + +out: + if (!request) + omap_iommu_dra7_emu_swsup_config(pdev, false); + + return ret; } |