/* * Copyright 2011-2014 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "common.h" #include "hardware.h" #define CCR 0x0 #define BM_CCR_WB_COUNT (0x7 << 16) #define BM_CCR_RBC_BYPASS_COUNT (0x3f << 21) #define BM_CCR_RBC_EN (0x1 << 27) #define CLPCR 0x54 #define BP_CLPCR_LPM 0 #define BM_CLPCR_LPM (0x3 << 0) #define BM_CLPCR_BYPASS_PMIC_READY (0x1 << 2) #define BM_CLPCR_ARM_CLK_DIS_ON_LPM (0x1 << 5) #define BM_CLPCR_SBYOS (0x1 << 6) #define BM_CLPCR_DIS_REF_OSC (0x1 << 7) #define BM_CLPCR_VSTBY (0x1 << 8) #define BP_CLPCR_STBY_COUNT 9 #define BM_CLPCR_STBY_COUNT (0x3 << 9) #define BM_CLPCR_COSC_PWRDOWN (0x1 << 11) #define BM_CLPCR_WB_PER_AT_LPM (0x1 << 16) #define BM_CLPCR_WB_CORE_AT_LPM (0x1 << 17) #define BM_CLPCR_BYP_MMDC_CH0_LPM_HS (0x1 << 19) #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS (0x1 << 21) #define BM_CLPCR_MASK_CORE0_WFI (0x1 << 22) #define BM_CLPCR_MASK_CORE1_WFI (0x1 << 23) #define BM_CLPCR_MASK_CORE2_WFI (0x1 << 24) #define BM_CLPCR_MASK_CORE3_WFI (0x1 << 25) #define BM_CLPCR_MASK_SCU_IDLE (0x1 << 26) #define BM_CLPCR_MASK_L2CC_IDLE (0x1 << 27) #define CGPR 0x64 #define BM_CGPR_INT_MEM_CLK_LPM (0x1 << 17) #define MX6Q_SUSPEND_OCRAM_SIZE 0x1000 #define MX6_MAX_MMDC_IO_NUM 33 static void __iomem *ccm_base; static void __iomem *suspend_ocram_base; static void (*imx6_suspend_in_ocram_fn)(void __iomem *ocram_vbase); /* * suspend ocram space layout: * ======================== high address ====================== * . * . * . * ^ * ^ * ^ * imx6_suspend code * PM_INFO structure(imx6_cpu_pm_info) * ======================== low address ======================= */ struct imx6_pm_base { phys_addr_t pbase; void __iomem *vbase; }; struct imx6_pm_socdata { u32 ddr_type; const char *mmdc_compat; const char *src_compat; const char *iomuxc_compat; const char *gpc_compat; const char *pl310_compat; const u32 mmdc_io_num; const u32 *mmdc_io_offset; }; static const u32 imx6q_mmdc_io_offset[] __initconst = { 0x5ac, 0x5b4, 0x528, 0x520, /* DQM0 ~ DQM3 */ 0x514, 0x510, 0x5bc, 0x5c4, /* DQM4 ~ DQM7 */ 0x56c, 0x578, 0x588, 0x594, /* CAS, RAS, SDCLK_0, SDCLK_1 */ 0x5a8, 0x5b0, 0x524, 0x51c, /* SDQS0 ~ SDQS3 */ 0x518, 0x50c, 0x5b8, 0x5c0, /* SDQS4 ~ SDQS7 */ 0x784, 0x788, 0x794, 0x79c, /* GPR_B0DS ~ GPR_B3DS */ 0x7a0, 0x7a4, 0x7a8, 0x748, /* GPR_B4DS ~ GPR_B7DS */ 0x59c, 0x5a0, 0x750, 0x774, /* SODT0, SODT1, MODE_CTL, MODE */ 0x74c, /* GPR_ADDS */ }; static const u32 imx6dl_mmdc_io_offset[] __initconst = { 0x470, 0x474, 0x478, 0x47c, /* DQM0 ~ DQM3 */ 0x480, 0x484, 0x488, 0x48c, /* DQM4 ~ DQM7 */ 0x464, 0x490, 0x4ac, 0x4b0, /* CAS, RAS, SDCLK_0, SDCLK_1 */ 0x4bc, 0x4c0, 0x4c4, 0x4c8, /* DRAM_SDQS0 ~ DRAM_SDQS3 */ 0x4cc, 0x4d0, 0x4d4, 0x4d8, /* DRAM_SDQS4 ~ DRAM_SDQS7 */ 0x764, 0x770, 0x778, 0x77c, /* GPR_B0DS ~ GPR_B3DS */ 0x780, 0x784, 0x78c, 0x748, /* GPR_B4DS ~ GPR_B7DS */ 0x4b4, 0x4b8, 0x750, 0x760, /* SODT0, SODT1, MODE_CTL, MODE */ 0x74c, /* GPR_ADDS */ }; static const u32 imx6sl_mmdc_io_offset[] __initconst = { 0x30c, 0x310, 0x314, 0x318, /* DQM0 ~ DQM3 */ 0x5c4, 0x5cc, 0x5d4, 0x5d8, /* GPR_B0DS ~ GPR_B3DS */ 0x300, 0x31c, 0x338, 0x5ac, /* CAS, RAS, SDCLK_0, GPR_ADDS */ 0x33c, 0x340, 0x5b0, 0x5c0, /* SODT0, SODT1, MODE_CTL, MODE */ 0x330, 0x334, 0x320, /* SDCKE0, SDCKE1, RESET */ }; static const u32 imx6sx_mmdc_io_offset[] __initconst = { 0x2ec, 0x2f0, 0x2f4, 0x2f8, /* DQM0 ~ DQM3 */ 0x60c, 0x610, 0x61c, 0x620, /* GPR_B0DS ~ GPR_B3DS */ 0x300, 0x2fc, 0x32c, 0x5f4, /* CAS, RAS, SDCLK_0, GPR_ADDS */ 0x310, 0x314, 0x5f8, 0x608, /* SODT0, SODT1, MODE_CTL, MODE */ 0x330, 0x334, 0x338, 0x33c, /* SDQS0 ~ SDQS3 */ }; static const u32 imx6ul_mmdc_io_offset[] __initconst = { 0x244, 0x248, 0x24c, 0x250, /* DQM0, DQM1, RAS, CAS */ 0x27c, 0x498, 0x4a4, 0x490, /* SDCLK0, GPR_B0DS-B1DS, GPR_ADDS */ 0x280, 0x284, 0x260, 0x264, /* SDQS0~1, SODT0, SODT1 */ 0x494, 0x4b0, /* MODE_CTL, MODE, */ }; static const struct imx6_pm_socdata imx6q_pm_data __initconst = { .mmdc_compat = "fsl,imx6q-mmdc", .src_compat = "fsl,imx6q-src", .iomuxc_compat = "fsl,imx6q-iomuxc", .gpc_compat = "fsl,imx6q-gpc", .pl310_compat = "arm,pl310-cache", .mmdc_io_num = ARRAY_SIZE(imx6q_mmdc_io_offset), .mmdc_io_offset = imx6q_mmdc_io_offset, }; static const struct imx6_pm_socdata imx6dl_pm_data __initconst = { .mmdc_compat = "fsl,imx6q-mmdc", .src_compat = "fsl,imx6q-src", .iomuxc_compat = "fsl,imx6dl-iomuxc", .gpc_compat = "fsl,imx6q-gpc", .pl310_compat = "arm,pl310-cache", .mmdc_io_num = ARRAY_SIZE(imx6dl_mmdc_io_offset), .mmdc_io_offset = imx6dl_mmdc_io_offset, }; static const struct imx6_pm_socdata imx6sl_pm_data __initconst = { .mmdc_compat = "fsl,imx6sl-mmdc", .src_compat = "fsl,imx6sl-src", .iomuxc_compat = "fsl,imx6sl-iomuxc", .gpc_compat = "fsl,imx6sl-gpc", .pl310_compat = "arm,pl310-cache", .mmdc_io_num = ARRAY_SIZE(imx6sl_mmdc_io_offset), .mmdc_io_offset = imx6sl_mmdc_io_offset, }; static const struct imx6_pm_socdata imx6sx_pm_data __initconst = { .mmdc_compat = "fsl,imx6sx-mmdc", .src_compat = "fsl,imx6sx-src", .iomuxc_compat = "fsl,imx6sx-iomuxc", .gpc_compat = "fsl,imx6sx-gpc", .pl310_compat = "arm,pl310-cache", .mmdc_io_num = ARRAY_SIZE(imx6sx_mmdc_io_offset), .mmdc_io_offset = imx6sx_mmdc_io_offset, }; static const struct imx6_pm_socdata imx6ul_pm_data __initconst = { .mmdc_compat = "fsl,imx6ul-mmdc", .src_compat = "fsl,imx6ul-src", .iomuxc_compat = "fsl,imx6ul-iomuxc", .gpc_compat = "fsl,imx6ul-gpc", .pl310_compat = NULL, .mmdc_io_num = ARRAY_SIZE(imx6ul_mmdc_io_offset), .mmdc_io_offset = imx6ul_mmdc_io_offset, }; /* * This structure is for passing necessary data for low level ocram * suspend code(arch/arm/mach-imx/suspend-imx6.S), if this struct * definition is changed, the offset definition in * arch/arm/mach-imx/suspend-imx6.S must be also changed accordingly, * otherwise, the suspend to ocram function will be broken! */ struct imx6_cpu_pm_info { phys_addr_t pbase; /* The physical address of pm_info. */ phys_addr_t resume_addr; /* The physical resume address for asm code */ u32 ddr_type; u32 pm_info_size; /* Size of pm_info. */ struct imx6_pm_base mmdc_base; struct imx6_pm_base src_base; struct imx6_pm_base iomuxc_base; struct imx6_pm_base ccm_base; struct imx6_pm_base gpc_base; struct imx6_pm_base l2_base; u32 mmdc_io_num; /* Number of MMDC IOs which need saved/restored. */ u32 mmdc_io_val[MX6_MAX_MMDC_IO_NUM][2]; /* To save offset and value */ } __aligned(8); void imx6_set_int_mem_clk_lpm(bool enable) { u32 val = readl_relaxed(ccm_base + CGPR); val &= ~BM_CGPR_INT_MEM_CLK_LPM; if (enable) val |= BM_CGPR_INT_MEM_CLK_LPM; writel_relaxed(val, ccm_base + CGPR); } void imx6_enable_rbc(bool enable) { u32 val; /* * need to mask all interrupts in GPC before * operating RBC configurations */ imx_gpc_mask_all(); /* configure RBC enable bit */ val = readl_relaxed(ccm_base + CCR); val &= ~BM_CCR_RBC_EN; val |= enable ? BM_CCR_RBC_EN : 0; writel_relaxed(val, ccm_base + CCR); /* configure RBC count */ val = readl_relaxed(ccm_base + CCR); val &= ~BM_CCR_RBC_BYPASS_COUNT; val |= enable ? BM_CCR_RBC_BYPASS_COUNT : 0; writel(val, ccm_base + CCR); /* * need to delay at least 2 cycles of CKIL(32K) * due to hardware design requirement, which is * ~61us, here we use 65us for safe */ udelay(65); /* restore GPC interrupt mask settings */ imx_gpc_restore_all(); } static void imx6q_enable_wb(bool enable) { u32 val; /* configure well bias enable bit */ val = readl_relaxed(ccm_base + CLPCR); val &= ~BM_CLPCR_WB_PER_AT_LPM; val |= enable ? BM_CLPCR_WB_PER_AT_LPM : 0; writel_relaxed(val, ccm_base + CLPCR); /* configure well bias count */ val = readl_relaxed(ccm_base + CCR); val &= ~BM_CCR_WB_COUNT; val |= enable ? BM_CCR_WB_COUNT : 0; writel_relaxed(val, ccm_base + CCR); } int imx6_set_lpm(enum mxc_cpu_pwr_mode mode) { u32 val = readl_relaxed(ccm_base + CLPCR); val &= ~BM_CLPCR_LPM; switch (mode) { case WAIT_CLOCKED: break; case WAIT_UNCLOCKED: val |= 0x1 << BP_CLPCR_LPM; val |= BM_CLPCR_ARM_CLK_DIS_ON_LPM; break; case STOP_POWER_ON: val |= 0x2 << BP_CLPCR_LPM; val &= ~BM_CLPCR_VSTBY; val &= ~BM_CLPCR_SBYOS; if (cpu_is_imx6sl()) val |= BM_CLPCR_BYPASS_PMIC_READY; if (cpu_is_imx6sl() || cpu_is_imx6sx() || cpu_is_imx6ul()) val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS; else val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS; break; case WAIT_UNCLOCKED_POWER_OFF: val |= 0x1 << BP_CLPCR_LPM; val &= ~BM_CLPCR_VSTBY; val &= ~BM_CLPCR_SBYOS; break; case STOP_POWER_OFF: val |= 0x2 << BP_CLPCR_LPM; val |= 0x3 << BP_CLPCR_STBY_COUNT; val |= BM_CLPCR_VSTBY; val |= BM_CLPCR_SBYOS; if (cpu_is_imx6sl() || cpu_is_imx6sx()) val |= BM_CLPCR_BYPASS_PMIC_READY; if (cpu_is_imx6sl() || cpu_is_imx6sx() || cpu_is_imx6ul()) val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS; else val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS; break; default: return -EINVAL; } /* * ERR007265: CCM: When improper low-power sequence is used, * the SoC enters low power mode before the ARM core executes WFI. * * Software workaround: * 1) Software should trigger IRQ #32 (IOMUX) to be always pending * by setting IOMUX_GPR1_GINT. * 2) Software should then unmask IRQ #32 in GPC before setting CCM * Low-Power mode. * 3) Software should mask IRQ #32 right after CCM Low-Power mode * is set (set bits 0-1 of CCM_CLPCR). * * Note that IRQ #32 is GIC SPI #0. */ imx_gpc_hwirq_unmask(0); writel_relaxed(val, ccm_base + CLPCR); imx_gpc_hwirq_mask(0); return 0; } static int imx6q_suspend_finish(unsigned long val) { if (!imx6_suspend_in_ocram_fn) { cpu_do_idle(); } else { /* * call low level suspend function in ocram, * as we need to float DDR IO. */ local_flush_tlb_all(); /* check if need to flush internal L2 cache */ if (!((struct imx6_cpu_pm_info *) suspend_ocram_base)->l2_base.vbase) flush_cache_all(); imx6_suspend_in_ocram_fn(suspend_ocram_base); } return 0; } static int imx6q_pm_enter(suspend_state_t state) { switch (state) { case PM_SUSPEND_STANDBY: imx6_set_lpm(STOP_POWER_ON); imx6_set_int_mem_clk_lpm(true); imx_gpc_pre_suspend(false); if (cpu_is_imx6sl()) imx6sl_set_wait_clk(true); /* Zzz ... */ cpu_do_idle(); if (cpu_is_imx6sl()) imx6sl_set_wait_clk(false); imx_gpc_post_resume(); imx6_set_lpm(WAIT_CLOCKED); break; case PM_SUSPEND_MEM: imx6_set_lpm(STOP_POWER_OFF); imx6_set_int_mem_clk_lpm(false); imx6q_enable_wb(true); /* * For suspend into ocram, asm code already take care of * RBC setting, so we do NOT need to do that here. */ if (!imx6_suspend_in_ocram_fn) imx6_enable_rbc(true); imx_gpc_pre_suspend(true); imx_anatop_pre_suspend(); /* Zzz ... */ cpu_suspend(0, imx6q_suspend_finish); if (cpu_is_imx6q() || cpu_is_imx6dl()) imx_smp_prepare(); imx_anatop_post_resume(); imx_gpc_post_resume(); imx6_enable_rbc(false); imx6q_enable_wb(false); imx6_set_int_mem_clk_lpm(true); imx6_set_lpm(WAIT_CLOCKED); break; default: return -EINVAL; } return 0; } static int imx6q_pm_valid(suspend_state_t state) { return (state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM); } static const struct platform_suspend_ops imx6q_pm_ops = { .enter = imx6q_pm_enter, .valid = imx6q_pm_valid, }; static int __init imx6_pm_get_base(struct imx6_pm_base *base, const char *compat) { struct device_node *node; struct resource res; int ret = 0; node = of_find_compatible_node(NULL, NULL, compat); if (!node) { ret = -ENODEV; goto out; } ret = of_address_to_resource(node, 0, &res); if (ret) goto put_node; base->pbase = res.start; base->vbase = ioremap(res.start, resource_size(&res)); if (!base->vbase) ret = -ENOMEM; put_node: of_node_put(node); out: return ret; } static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata) { phys_addr_t ocram_pbase; struct device_node *node; struct platform_device *pdev; struct imx6_cpu_pm_info *pm_info; struct gen_pool *ocram_pool; unsigned long ocram_base; int i, ret = 0; const u32 *mmdc_offset_array; suspend_set_ops(&imx6q_pm_ops); if (!socdata) { pr_warn("%s: invalid argument!\n", __func__); return -EINVAL; } node = of_find_compatible_node(NULL, NULL, "mmio-sram"); if (!node) { pr_warn("%s: failed to find ocram node!\n", __func__); return -ENODEV; } pdev = of_find_device_by_node(node); if (!pdev) { pr_warn("%s: failed to find ocram device!\n", __func__); ret = -ENODEV; goto put_node; } ocram_pool = gen_pool_get(&pdev->dev, NULL); if (!ocram_pool) { pr_warn("%s: ocram pool unavailable!\n", __func__); ret = -ENODEV; goto put_device; } ocram_base = gen_pool_alloc(ocram_pool, MX6Q_SUSPEND_OCRAM_SIZE); if (!ocram_base) { pr_warn("%s: unable to alloc ocram!\n", __func__); ret = -ENOMEM; goto put_device; } ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base); suspend_ocram_base = __arm_ioremap_exec(ocram_pbase, MX6Q_SUSPEND_OCRAM_SIZE, false); memset(suspend_ocram_base, 0, sizeof(*pm_info)); pm_info = suspend_ocram_base; pm_info->pbase = ocram_pbase; pm_info->resume_addr = virt_to_phys(v7_cpu_resume); pm_info->pm_info_size = sizeof(*pm_info); /* * ccm physical address is not used by asm code currently, * so get ccm virtual address directly. */ pm_info->ccm_base.vbase = ccm_base; ret = imx6_pm_get_base(&pm_info->mmdc_base, socdata->mmdc_compat); if (ret) { pr_warn("%s: failed to get mmdc base %d!\n", __func__, ret); goto put_device; } ret = imx6_pm_get_base(&pm_info->src_base, socdata->src_compat); if (ret) { pr_warn("%s: failed to get src base %d!\n", __func__, ret); goto src_map_failed; } ret = imx6_pm_get_base(&pm_info->iomuxc_base, socdata->iomuxc_compat); if (ret) { pr_warn("%s: failed to get iomuxc base %d!\n", __func__, ret); goto iomuxc_map_failed; } ret = imx6_pm_get_base(&pm_info->gpc_base, socdata->gpc_compat); if (ret) { pr_warn("%s: failed to get gpc base %d!\n", __func__, ret); goto gpc_map_failed; } if (socdata->pl310_compat) { ret = imx6_pm_get_base(&pm_info->l2_base, socdata->pl310_compat); if (ret) { pr_warn("%s: failed to get pl310-cache base %d!\n", __func__, ret); goto pl310_cache_map_failed; } } pm_info->ddr_type = imx_mmdc_get_ddr_type(); pm_info->mmdc_io_num = socdata->mmdc_io_num; mmdc_offset_array = socdata->mmdc_io_offset; for (i = 0; i < pm_info->mmdc_io_num; i++) { pm_info->mmdc_io_val[i][0] = mmdc_offset_array[i]; pm_info->mmdc_io_val[i][1] = readl_relaxed(pm_info->iomuxc_base.vbase + mmdc_offset_array[i]); } imx6_suspend_in_ocram_fn = fncpy( suspend_ocram_base + sizeof(*pm_info), &imx6_suspend, MX6Q_SUSPEND_OCRAM_SIZE - sizeof(*pm_info)); goto put_device; pl310_cache_map_failed: iounmap(pm_info->gpc_base.vbase); gpc_map_failed: iounmap(pm_info->iomuxc_base.vbase); iomuxc_map_failed: iounmap(pm_info->src_base.vbase); src_map_failed: iounmap(pm_info->mmdc_base.vbase); put_device: put_device(&pdev->dev); put_node: of_node_put(node); return ret; } static void __init imx6_pm_common_init(const struct imx6_pm_socdata *socdata) { struct regmap *gpr; int ret; WARN_ON(!ccm_base); if (IS_ENABLED(CONFIG_SUSPEND)) { ret = imx6q_suspend_init(socdata); if (ret) pr_warn("%s: No DDR LPM support with suspend %d!\n", __func__, ret); } /* * This is for SW workaround step #1 of ERR007265, see comments * in imx6_set_lpm for details of this errata. * Force IOMUXC irq pending, so that the interrupt to GPC can be * used to deassert dsm_request signal when the signal gets * asserted unexpectedly. */ gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); if (!IS_ERR(gpr)) regmap_update_bits(gpr, IOMUXC_GPR1, IMX6Q_GPR1_GINT, IMX6Q_GPR1_GINT); } static void imx6_pm_stby_poweroff(void) { gic_cpu_if_down(0); imx6_set_lpm(STOP_POWER_OFF); imx6q_suspend_finish(0); mdelay(1000); pr_emerg("Unable to poweroff system\n"); } static int imx6_pm_stby_poweroff_probe(void) { if (pm_power_off) { pr_warn("%s: pm_power_off already claimed %p %pf!\n", __func__, pm_power_off, pm_power_off); return -EBUSY; } pm_power_off = imx6_pm_stby_poweroff; return 0; } void __init imx6_pm_ccm_init(const char *ccm_compat) { struct device_node *np; u32 val; np = of_find_compatible_node(NULL, NULL, ccm_compat); ccm_base = of_iomap(np, 0); BUG_ON(!ccm_base); /* * Initialize CCM_CLPCR_LPM into RUN mode to avoid ARM core * clock being shut down unexpectedly by WAIT mode. */ val = readl_relaxed(ccm_base + CLPCR); val &= ~BM_CLPCR_LPM; writel_relaxed(val, ccm_base + CLPCR); if (of_property_read_bool(np, "fsl,pmic-stby-poweroff")) imx6_pm_stby_poweroff_probe(); } void __init imx6q_pm_init(void) { imx6_pm_common_init(&imx6q_pm_data); } void __init imx6dl_pm_init(void) { imx6_pm_common_init(&imx6dl_pm_data); } void __init imx6sl_pm_init(void) { imx6_pm_common_init(&imx6sl_pm_data); } void __init imx6sx_pm_init(void) { imx6_pm_common_init(&imx6sx_pm_data); } void __init imx6ul_pm_init(void) { imx6_pm_common_init(&imx6ul_pm_data); }