summaryrefslogtreecommitdiffstats
path: root/drivers/soc/mediatek/mtk-infracfg.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 21:18:40 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 21:18:40 +0200
commit50686e8a3aed2f5d295e9d2e79ff43df461c7b76 (patch)
treee5de912d74c6e1d75e6ecf75f2a62c313955baff /drivers/soc/mediatek/mtk-infracfg.c
parentMerge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/a... (diff)
parentMerge tag 'v4.3-rockchip32-soc3' of git://git.kernel.org/pub/scm/linux/kernel... (diff)
downloadlinux-50686e8a3aed2f5d295e9d2e79ff43df461c7b76.tar.xz
linux-50686e8a3aed2f5d295e9d2e79ff43df461c7b76.zip
Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC platform updates from Olof Johansson: "New or improved SoC support: - add support for Atmel's SAMA5D2 SoC - add support for Freescale i.MX6UL - improved support for TI's DM814x platform - misc fixes and improvements for RockChip platforms - Marvell MVEBU suspend/resume support A few driver changes that ideally would belong in the drivers branch are also here (acked by appropriate maintainers): - power key input driver for Freescale platforms (svns) - RTC driver updates for Freescale platforms (svns/mxc) - clk fixes for TI DM814/816X + a bunch of other changes for various platforms" * tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (83 commits) ARM: rockchip: pm: Fix PTR_ERR() argument ARM: imx: mach-imx6ul: Fix allmodconfig build clk: ti: fix for definition movement ARM: uniphier: drop v7_invalidate_l1 call at secondary entry memory: kill off set_irq_flags usage rtc: snvs: select option REGMAP_MMIO ARM: brcmstb: select ARCH_DMA_ADDR_T_64BIT for LPAE ARM: BCM: Enable ARM erratum 798181 for BRCMSTB ARM: OMAP2+: Fix power domain operations regression caused by 81xx ARM: rockchip: enable PMU_GPIOINT_WAKEUP_EN when entering shallow suspend ARM: rockchip: set correct stabilization thresholds in suspend ARM: rockchip: rename osc_switch_to_32k variable ARM: imx6ul: add fec MAC refrence clock and phy fixup init ARM: imx6ul: add fec bits to GPR syscon definition rtc: mxc: add support of device tree dt-binding: document the binding for mxc rtc rtc: mxc: use a second rtc clock ARM: davinci: cp_intc: use IRQCHIP_SKIP_SET_WAKE instead of irq_set_wake callback soc: mediatek: Fix SCPSYS compilation ARM: at91/soc: add basic support for new sama5d2 SoC ...
Diffstat (limited to 'drivers/soc/mediatek/mtk-infracfg.c')
-rw-r--r--drivers/soc/mediatek/mtk-infracfg.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c
new file mode 100644
index 000000000000..dba3055a9493
--- /dev/null
+++ b/drivers/soc/mediatek/mtk-infracfg.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/export.h>
+#include <linux/jiffies.h>
+#include <linux/regmap.h>
+#include <linux/soc/mediatek/infracfg.h>
+#include <asm/processor.h>
+
+#define INFRA_TOPAXI_PROTECTEN 0x0220
+#define INFRA_TOPAXI_PROTECTSTA1 0x0228
+
+/**
+ * mtk_infracfg_set_bus_protection - enable bus protection
+ * @regmap: The infracfg regmap
+ * @mask: The mask containing the protection bits to be enabled.
+ *
+ * This function enables the bus protection bits for disabled power
+ * domains so that the system does not hang when some unit accesses the
+ * bus while in power down.
+ */
+int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask)
+{
+ unsigned long expired;
+ u32 val;
+ int ret;
+
+ regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, mask);
+
+ expired = jiffies + HZ;
+
+ while (1) {
+ ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
+ if (ret)
+ return ret;
+
+ if ((val & mask) == mask)
+ break;
+
+ cpu_relax();
+ if (time_after(jiffies, expired))
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * mtk_infracfg_clear_bus_protection - disable bus protection
+ * @regmap: The infracfg regmap
+ * @mask: The mask containing the protection bits to be disabled.
+ *
+ * This function disables the bus protection bits previously enabled with
+ * mtk_infracfg_set_bus_protection.
+ */
+int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask)
+{
+ unsigned long expired;
+ int ret;
+
+ regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0);
+
+ expired = jiffies + HZ;
+
+ while (1) {
+ u32 val;
+
+ ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & mask))
+ break;
+
+ cpu_relax();
+ if (time_after(jiffies, expired))
+ return -EIO;
+ }
+
+ return 0;
+}