2 * Copyright 2011-2014 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/delay.h>
14 #include <linux/init.h>
16 #include <linux/irq.h>
17 #include <linux/genalloc.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
21 #include <linux/of_address.h>
22 #include <linux/of_platform.h>
23 #include <linux/regmap.h>
24 #include <linux/suspend.h>
25 #include <asm/cacheflush.h>
26 #include <asm/fncpy.h>
27 #include <asm/proc-fns.h>
28 #include <asm/suspend.h>
35 #define BM_CCR_WB_COUNT (0x7 << 16)
36 #define BM_CCR_RBC_BYPASS_COUNT (0x3f << 21)
37 #define BM_CCR_RBC_EN (0x1 << 27)
40 #define BP_CLPCR_LPM 0
41 #define BM_CLPCR_LPM (0x3 << 0)
42 #define BM_CLPCR_BYPASS_PMIC_READY (0x1 << 2)
43 #define BM_CLPCR_ARM_CLK_DIS_ON_LPM (0x1 << 5)
44 #define BM_CLPCR_SBYOS (0x1 << 6)
45 #define BM_CLPCR_DIS_REF_OSC (0x1 << 7)
46 #define BM_CLPCR_VSTBY (0x1 << 8)
47 #define BP_CLPCR_STBY_COUNT 9
48 #define BM_CLPCR_STBY_COUNT (0x3 << 9)
49 #define BM_CLPCR_COSC_PWRDOWN (0x1 << 11)
50 #define BM_CLPCR_WB_PER_AT_LPM (0x1 << 16)
51 #define BM_CLPCR_WB_CORE_AT_LPM (0x1 << 17)
52 #define BM_CLPCR_BYP_MMDC_CH0_LPM_HS (0x1 << 19)
53 #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS (0x1 << 21)
54 #define BM_CLPCR_MASK_CORE0_WFI (0x1 << 22)
55 #define BM_CLPCR_MASK_CORE1_WFI (0x1 << 23)
56 #define BM_CLPCR_MASK_CORE2_WFI (0x1 << 24)
57 #define BM_CLPCR_MASK_CORE3_WFI (0x1 << 25)
58 #define BM_CLPCR_MASK_SCU_IDLE (0x1 << 26)
59 #define BM_CLPCR_MASK_L2CC_IDLE (0x1 << 27)
62 #define BM_CGPR_INT_MEM_CLK_LPM (0x1 << 17)
64 #define MX6Q_SUSPEND_OCRAM_SIZE 0x1000
65 #define MX6_MAX_MMDC_IO_NUM 33
67 static void __iomem *ccm_base;
68 static void __iomem *suspend_ocram_base;
69 static void (*imx6_suspend_in_ocram_fn)(void __iomem *ocram_vbase);
72 * suspend ocram space layout:
73 * ======================== high address ======================
81 * PM_INFO structure(imx6_cpu_pm_info)
82 * ======================== low address =======================
90 struct imx6_pm_socdata {
92 const char *mmdc_compat;
93 const char *src_compat;
94 const char *iomuxc_compat;
95 const char *gpc_compat;
96 const u32 mmdc_io_num;
97 const u32 *mmdc_io_offset;
100 static const u32 imx6q_mmdc_io_offset[] __initconst = {
101 0x5ac, 0x5b4, 0x528, 0x520, /* DQM0 ~ DQM3 */
102 0x514, 0x510, 0x5bc, 0x5c4, /* DQM4 ~ DQM7 */
103 0x56c, 0x578, 0x588, 0x594, /* CAS, RAS, SDCLK_0, SDCLK_1 */
104 0x5a8, 0x5b0, 0x524, 0x51c, /* SDQS0 ~ SDQS3 */
105 0x518, 0x50c, 0x5b8, 0x5c0, /* SDQS4 ~ SDQS7 */
106 0x784, 0x788, 0x794, 0x79c, /* GPR_B0DS ~ GPR_B3DS */
107 0x7a0, 0x7a4, 0x7a8, 0x748, /* GPR_B4DS ~ GPR_B7DS */
108 0x59c, 0x5a0, 0x750, 0x774, /* SODT0, SODT1, MODE_CTL, MODE */
109 0x74c, /* GPR_ADDS */
112 static const u32 imx6dl_mmdc_io_offset[] __initconst = {
113 0x470, 0x474, 0x478, 0x47c, /* DQM0 ~ DQM3 */
114 0x480, 0x484, 0x488, 0x48c, /* DQM4 ~ DQM7 */
115 0x464, 0x490, 0x4ac, 0x4b0, /* CAS, RAS, SDCLK_0, SDCLK_1 */
116 0x4bc, 0x4c0, 0x4c4, 0x4c8, /* DRAM_SDQS0 ~ DRAM_SDQS3 */
117 0x4cc, 0x4d0, 0x4d4, 0x4d8, /* DRAM_SDQS4 ~ DRAM_SDQS7 */
118 0x764, 0x770, 0x778, 0x77c, /* GPR_B0DS ~ GPR_B3DS */
119 0x780, 0x784, 0x78c, 0x748, /* GPR_B4DS ~ GPR_B7DS */
120 0x4b4, 0x4b8, 0x750, 0x760, /* SODT0, SODT1, MODE_CTL, MODE */
121 0x74c, /* GPR_ADDS */
124 static const u32 imx6sl_mmdc_io_offset[] __initconst = {
125 0x30c, 0x310, 0x314, 0x318, /* DQM0 ~ DQM3 */
126 0x5c4, 0x5cc, 0x5d4, 0x5d8, /* GPR_B0DS ~ GPR_B3DS */
127 0x300, 0x31c, 0x338, 0x5ac, /* CAS, RAS, SDCLK_0, GPR_ADDS */
128 0x33c, 0x340, 0x5b0, 0x5c0, /* SODT0, SODT1, MODE_CTL, MODE */
129 0x330, 0x334, 0x320, /* SDCKE0, SDCKE1, RESET */
132 static const u32 imx6sx_mmdc_io_offset[] __initconst = {
133 0x2ec, 0x2f0, 0x2f4, 0x2f8, /* DQM0 ~ DQM3 */
134 0x60c, 0x610, 0x61c, 0x620, /* GPR_B0DS ~ GPR_B3DS */
135 0x300, 0x2fc, 0x32c, 0x5f4, /* CAS, RAS, SDCLK_0, GPR_ADDS */
136 0x310, 0x314, 0x5f8, 0x608, /* SODT0, SODT1, MODE_CTL, MODE */
137 0x330, 0x334, 0x338, 0x33c, /* SDQS0 ~ SDQS3 */
140 static const struct imx6_pm_socdata imx6q_pm_data __initconst = {
141 .cpu_type = MXC_CPU_IMX6Q,
142 .mmdc_compat = "fsl,imx6q-mmdc",
143 .src_compat = "fsl,imx6q-src",
144 .iomuxc_compat = "fsl,imx6q-iomuxc",
145 .gpc_compat = "fsl,imx6q-gpc",
146 .mmdc_io_num = ARRAY_SIZE(imx6q_mmdc_io_offset),
147 .mmdc_io_offset = imx6q_mmdc_io_offset,
150 static const struct imx6_pm_socdata imx6dl_pm_data __initconst = {
151 .cpu_type = MXC_CPU_IMX6DL,
152 .mmdc_compat = "fsl,imx6q-mmdc",
153 .src_compat = "fsl,imx6q-src",
154 .iomuxc_compat = "fsl,imx6dl-iomuxc",
155 .gpc_compat = "fsl,imx6q-gpc",
156 .mmdc_io_num = ARRAY_SIZE(imx6dl_mmdc_io_offset),
157 .mmdc_io_offset = imx6dl_mmdc_io_offset,
160 static const struct imx6_pm_socdata imx6sl_pm_data __initconst = {
161 .cpu_type = MXC_CPU_IMX6SL,
162 .mmdc_compat = "fsl,imx6sl-mmdc",
163 .src_compat = "fsl,imx6sl-src",
164 .iomuxc_compat = "fsl,imx6sl-iomuxc",
165 .gpc_compat = "fsl,imx6sl-gpc",
166 .mmdc_io_num = ARRAY_SIZE(imx6sl_mmdc_io_offset),
167 .mmdc_io_offset = imx6sl_mmdc_io_offset,
170 static const struct imx6_pm_socdata imx6sx_pm_data __initconst = {
171 .cpu_type = MXC_CPU_IMX6SX,
172 .mmdc_compat = "fsl,imx6sx-mmdc",
173 .src_compat = "fsl,imx6sx-src",
174 .iomuxc_compat = "fsl,imx6sx-iomuxc",
175 .gpc_compat = "fsl,imx6sx-gpc",
176 .mmdc_io_num = ARRAY_SIZE(imx6sx_mmdc_io_offset),
177 .mmdc_io_offset = imx6sx_mmdc_io_offset,
181 * This structure is for passing necessary data for low level ocram
182 * suspend code(arch/arm/mach-imx/suspend-imx6.S), if this struct
183 * definition is changed, the offset definition in
184 * arch/arm/mach-imx/suspend-imx6.S must be also changed accordingly,
185 * otherwise, the suspend to ocram function will be broken!
187 struct imx6_cpu_pm_info {
188 phys_addr_t pbase; /* The physical address of pm_info. */
189 phys_addr_t resume_addr; /* The physical resume address for asm code */
191 u32 pm_info_size; /* Size of pm_info. */
192 struct imx6_pm_base mmdc_base;
193 struct imx6_pm_base src_base;
194 struct imx6_pm_base iomuxc_base;
195 struct imx6_pm_base ccm_base;
196 struct imx6_pm_base gpc_base;
197 struct imx6_pm_base l2_base;
198 u32 mmdc_io_num; /* Number of MMDC IOs which need saved/restored. */
199 u32 mmdc_io_val[MX6_MAX_MMDC_IO_NUM][2]; /* To save offset and value */
202 void imx6q_set_int_mem_clk_lpm(bool enable)
204 u32 val = readl_relaxed(ccm_base + CGPR);
206 val &= ~BM_CGPR_INT_MEM_CLK_LPM;
208 val |= BM_CGPR_INT_MEM_CLK_LPM;
209 writel_relaxed(val, ccm_base + CGPR);
212 static void imx6q_enable_rbc(bool enable)
217 * need to mask all interrupts in GPC before
218 * operating RBC configurations
222 /* configure RBC enable bit */
223 val = readl_relaxed(ccm_base + CCR);
224 val &= ~BM_CCR_RBC_EN;
225 val |= enable ? BM_CCR_RBC_EN : 0;
226 writel_relaxed(val, ccm_base + CCR);
228 /* configure RBC count */
229 val = readl_relaxed(ccm_base + CCR);
230 val &= ~BM_CCR_RBC_BYPASS_COUNT;
231 val |= enable ? BM_CCR_RBC_BYPASS_COUNT : 0;
232 writel(val, ccm_base + CCR);
235 * need to delay at least 2 cycles of CKIL(32K)
236 * due to hardware design requirement, which is
237 * ~61us, here we use 65us for safe
241 /* restore GPC interrupt mask settings */
242 imx_gpc_restore_all();
245 static void imx6q_enable_wb(bool enable)
249 /* configure well bias enable bit */
250 val = readl_relaxed(ccm_base + CLPCR);
251 val &= ~BM_CLPCR_WB_PER_AT_LPM;
252 val |= enable ? BM_CLPCR_WB_PER_AT_LPM : 0;
253 writel_relaxed(val, ccm_base + CLPCR);
255 /* configure well bias count */
256 val = readl_relaxed(ccm_base + CCR);
257 val &= ~BM_CCR_WB_COUNT;
258 val |= enable ? BM_CCR_WB_COUNT : 0;
259 writel_relaxed(val, ccm_base + CCR);
262 int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode)
264 u32 val = readl_relaxed(ccm_base + CLPCR);
266 val &= ~BM_CLPCR_LPM;
271 val |= 0x1 << BP_CLPCR_LPM;
272 val |= BM_CLPCR_ARM_CLK_DIS_ON_LPM;
275 val |= 0x2 << BP_CLPCR_LPM;
276 val &= ~BM_CLPCR_VSTBY;
277 val &= ~BM_CLPCR_SBYOS;
279 val |= BM_CLPCR_BYPASS_PMIC_READY;
280 if (cpu_is_imx6sl() || cpu_is_imx6sx())
281 val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
283 val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
285 case WAIT_UNCLOCKED_POWER_OFF:
286 val |= 0x1 << BP_CLPCR_LPM;
287 val &= ~BM_CLPCR_VSTBY;
288 val &= ~BM_CLPCR_SBYOS;
291 val |= 0x2 << BP_CLPCR_LPM;
292 val |= 0x3 << BP_CLPCR_STBY_COUNT;
293 val |= BM_CLPCR_VSTBY;
294 val |= BM_CLPCR_SBYOS;
296 val |= BM_CLPCR_BYPASS_PMIC_READY;
297 if (cpu_is_imx6sl() || cpu_is_imx6sx())
298 val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
300 val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
307 * ERR007265: CCM: When improper low-power sequence is used,
308 * the SoC enters low power mode before the ARM core executes WFI.
310 * Software workaround:
311 * 1) Software should trigger IRQ #32 (IOMUX) to be always pending
312 * by setting IOMUX_GPR1_GINT.
313 * 2) Software should then unmask IRQ #32 in GPC before setting CCM
315 * 3) Software should mask IRQ #32 right after CCM Low-Power mode
316 * is set (set bits 0-1 of CCM_CLPCR).
318 imx_gpc_hwirq_unmask(32);
319 writel_relaxed(val, ccm_base + CLPCR);
320 imx_gpc_hwirq_mask(32);
325 static int imx6q_suspend_finish(unsigned long val)
327 if (!imx6_suspend_in_ocram_fn) {
331 * call low level suspend function in ocram,
332 * as we need to float DDR IO.
334 local_flush_tlb_all();
335 imx6_suspend_in_ocram_fn(suspend_ocram_base);
341 static int imx6q_pm_enter(suspend_state_t state)
344 case PM_SUSPEND_STANDBY:
345 imx6q_set_lpm(STOP_POWER_ON);
346 imx6q_set_int_mem_clk_lpm(true);
347 imx_gpc_pre_suspend(false);
349 imx6sl_set_wait_clk(true);
353 imx6sl_set_wait_clk(false);
354 imx_gpc_post_resume();
355 imx6q_set_lpm(WAIT_CLOCKED);
358 imx6q_set_lpm(STOP_POWER_OFF);
359 imx6q_set_int_mem_clk_lpm(false);
360 imx6q_enable_wb(true);
362 * For suspend into ocram, asm code already take care of
363 * RBC setting, so we do NOT need to do that here.
365 if (!imx6_suspend_in_ocram_fn)
366 imx6q_enable_rbc(true);
367 imx_gpc_pre_suspend(true);
368 imx_anatop_pre_suspend();
369 imx_set_cpu_jump(0, v7_cpu_resume);
371 cpu_suspend(0, imx6q_suspend_finish);
372 if (cpu_is_imx6q() || cpu_is_imx6dl())
374 imx_anatop_post_resume();
375 imx_gpc_post_resume();
376 imx6q_enable_rbc(false);
377 imx6q_enable_wb(false);
378 imx6q_set_int_mem_clk_lpm(true);
379 imx6q_set_lpm(WAIT_CLOCKED);
388 static int imx6q_pm_valid(suspend_state_t state)
390 return (state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM);
393 static const struct platform_suspend_ops imx6q_pm_ops = {
394 .enter = imx6q_pm_enter,
395 .valid = imx6q_pm_valid,
398 void __init imx6q_pm_set_ccm_base(void __iomem *base)
403 static int __init imx6_pm_get_base(struct imx6_pm_base *base,
406 struct device_node *node;
410 node = of_find_compatible_node(NULL, NULL, compat);
416 ret = of_address_to_resource(node, 0, &res);
420 base->pbase = res.start;
421 base->vbase = ioremap(res.start, resource_size(&res));
431 static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
433 phys_addr_t ocram_pbase;
434 struct device_node *node;
435 struct platform_device *pdev;
436 struct imx6_cpu_pm_info *pm_info;
437 struct gen_pool *ocram_pool;
438 unsigned long ocram_base;
440 const u32 *mmdc_offset_array;
442 suspend_set_ops(&imx6q_pm_ops);
445 pr_warn("%s: invalid argument!\n", __func__);
449 node = of_find_compatible_node(NULL, NULL, "mmio-sram");
451 pr_warn("%s: failed to find ocram node!\n", __func__);
455 pdev = of_find_device_by_node(node);
457 pr_warn("%s: failed to find ocram device!\n", __func__);
462 ocram_pool = dev_get_gen_pool(&pdev->dev);
464 pr_warn("%s: ocram pool unavailable!\n", __func__);
469 ocram_base = gen_pool_alloc(ocram_pool, MX6Q_SUSPEND_OCRAM_SIZE);
471 pr_warn("%s: unable to alloc ocram!\n", __func__);
476 ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
478 suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
479 MX6Q_SUSPEND_OCRAM_SIZE, false);
481 pm_info = suspend_ocram_base;
482 pm_info->pbase = ocram_pbase;
483 pm_info->resume_addr = virt_to_phys(v7_cpu_resume);
484 pm_info->pm_info_size = sizeof(*pm_info);
487 * ccm physical address is not used by asm code currently,
488 * so get ccm virtual address directly, as we already have
489 * it from ccm driver.
491 pm_info->ccm_base.vbase = ccm_base;
493 ret = imx6_pm_get_base(&pm_info->mmdc_base, socdata->mmdc_compat);
495 pr_warn("%s: failed to get mmdc base %d!\n", __func__, ret);
499 ret = imx6_pm_get_base(&pm_info->src_base, socdata->src_compat);
501 pr_warn("%s: failed to get src base %d!\n", __func__, ret);
505 ret = imx6_pm_get_base(&pm_info->iomuxc_base, socdata->iomuxc_compat);
507 pr_warn("%s: failed to get iomuxc base %d!\n", __func__, ret);
508 goto iomuxc_map_failed;
511 ret = imx6_pm_get_base(&pm_info->gpc_base, socdata->gpc_compat);
513 pr_warn("%s: failed to get gpc base %d!\n", __func__, ret);
517 ret = imx6_pm_get_base(&pm_info->l2_base, "arm,pl310-cache");
519 pr_warn("%s: failed to get pl310-cache base %d!\n",
521 goto pl310_cache_map_failed;
524 pm_info->cpu_type = socdata->cpu_type;
525 pm_info->mmdc_io_num = socdata->mmdc_io_num;
526 mmdc_offset_array = socdata->mmdc_io_offset;
528 for (i = 0; i < pm_info->mmdc_io_num; i++) {
529 pm_info->mmdc_io_val[i][0] =
530 mmdc_offset_array[i];
531 pm_info->mmdc_io_val[i][1] =
532 readl_relaxed(pm_info->iomuxc_base.vbase +
533 mmdc_offset_array[i]);
536 imx6_suspend_in_ocram_fn = fncpy(
537 suspend_ocram_base + sizeof(*pm_info),
539 MX6Q_SUSPEND_OCRAM_SIZE - sizeof(*pm_info));
543 pl310_cache_map_failed:
544 iounmap(&pm_info->gpc_base.vbase);
546 iounmap(&pm_info->iomuxc_base.vbase);
548 iounmap(&pm_info->src_base.vbase);
550 iounmap(&pm_info->mmdc_base.vbase);
557 static void __init imx6_pm_common_init(const struct imx6_pm_socdata
565 if (IS_ENABLED(CONFIG_SUSPEND)) {
566 ret = imx6q_suspend_init(socdata);
568 pr_warn("%s: No DDR LPM support with suspend %d!\n",
573 * This is for SW workaround step #1 of ERR007265, see comments
574 * in imx6q_set_lpm for details of this errata.
575 * Force IOMUXC irq pending, so that the interrupt to GPC can be
576 * used to deassert dsm_request signal when the signal gets
577 * asserted unexpectedly.
579 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
581 regmap_update_bits(gpr, IOMUXC_GPR1, IMX6Q_GPR1_GINT,
585 void __init imx6q_pm_init(void)
587 imx6_pm_common_init(&imx6q_pm_data);
590 void __init imx6dl_pm_init(void)
592 imx6_pm_common_init(&imx6dl_pm_data);
595 void __init imx6sl_pm_init(void)
597 imx6_pm_common_init(&imx6sl_pm_data);
600 void __init imx6sx_pm_init(void)
602 imx6_pm_common_init(&imx6sx_pm_data);