xref: /linux/drivers/platform/x86/intel/pmc/cnp.c (revision ab93e0dd72c37d378dd936f031ffb83ff2bd87ce)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * This file contains platform specific structure definitions
4  * and init function used by Cannon Lake Point PCH.
5  *
6  * Copyright (c) 2022, Intel Corporation.
7  * All Rights Reserved.
8  *
9  */
10 
11 #include <linux/smp.h>
12 #include <linux/suspend.h>
13 #include <asm/msr.h>
14 #include "core.h"
15 
16 /* Cannon Lake: PGD PFET Enable Ack Status Register(s) bitmap */
17 const struct pmc_bit_map cnp_pfear_map[] = {
18 	{"PMC",                 BIT(0)},
19 	{"OPI-DMI",             BIT(1)},
20 	{"SPI/eSPI",            BIT(2)},
21 	{"XHCI",                BIT(3)},
22 	{"SPA",                 BIT(4)},
23 	{"SPB",                 BIT(5)},
24 	{"SPC",                 BIT(6)},
25 	{"GBE",                 BIT(7)},
26 
27 	{"SATA",                BIT(0)},
28 	{"HDA_PGD0",            BIT(1)},
29 	{"HDA_PGD1",            BIT(2)},
30 	{"HDA_PGD2",            BIT(3)},
31 	{"HDA_PGD3",            BIT(4)},
32 	{"SPD",                 BIT(5)},
33 	{"LPSS",                BIT(6)},
34 	{"LPC",                 BIT(7)},
35 
36 	{"SMB",                 BIT(0)},
37 	{"ISH",                 BIT(1)},
38 	{"P2SB",                BIT(2)},
39 	{"NPK_VNN",             BIT(3)},
40 	{"SDX",                 BIT(4)},
41 	{"SPE",                 BIT(5)},
42 	{"Fuse",                BIT(6)},
43 	{"SBR8",		BIT(7)},
44 
45 	{"CSME_FSC",            BIT(0)},
46 	{"USB3_OTG",            BIT(1)},
47 	{"EXI",                 BIT(2)},
48 	{"CSE",                 BIT(3)},
49 	{"CSME_KVM",            BIT(4)},
50 	{"CSME_PMT",            BIT(5)},
51 	{"CSME_CLINK",          BIT(6)},
52 	{"CSME_PTIO",           BIT(7)},
53 
54 	{"CSME_USBR",           BIT(0)},
55 	{"CSME_SUSRAM",         BIT(1)},
56 	{"CSME_SMT1",           BIT(2)},
57 	{"CSME_SMT4",           BIT(3)},
58 	{"CSME_SMS2",           BIT(4)},
59 	{"CSME_SMS1",           BIT(5)},
60 	{"CSME_RTC",            BIT(6)},
61 	{"CSME_PSF",            BIT(7)},
62 
63 	{"SBR0",                BIT(0)},
64 	{"SBR1",                BIT(1)},
65 	{"SBR2",                BIT(2)},
66 	{"SBR3",                BIT(3)},
67 	{"SBR4",                BIT(4)},
68 	{"SBR5",                BIT(5)},
69 	{"CSME_PECI",           BIT(6)},
70 	{"PSF1",                BIT(7)},
71 
72 	{"PSF2",                BIT(0)},
73 	{"PSF3",                BIT(1)},
74 	{"PSF4",                BIT(2)},
75 	{"CNVI",                BIT(3)},
76 	{"UFS0",                BIT(4)},
77 	{"EMMC",                BIT(5)},
78 	{"SPF",			BIT(6)},
79 	{"SBR6",                BIT(7)},
80 
81 	{"SBR7",                BIT(0)},
82 	{"NPK_AON",             BIT(1)},
83 	{"HDA_PGD4",            BIT(2)},
84 	{"HDA_PGD5",            BIT(3)},
85 	{"HDA_PGD6",            BIT(4)},
86 	{"PSF6",		BIT(5)},
87 	{"PSF7",		BIT(6)},
88 	{"PSF8",		BIT(7)},
89 	{}
90 };
91 
92 static const struct pmc_bit_map *ext_cnp_pfear_map[] = {
93 	/*
94 	 * Check intel_pmc_core_ids[] users of cnp_reg_map for
95 	 * a list of core SoCs using this.
96 	 */
97 	cnp_pfear_map,
98 	NULL
99 };
100 
101 static const struct pmc_bit_map cnp_slps0_dbg0_map[] = {
102 	{"AUDIO_D3",		BIT(0)},
103 	{"OTG_D3",		BIT(1)},
104 	{"XHCI_D3",		BIT(2)},
105 	{"LPIO_D3",		BIT(3)},
106 	{"SDX_D3",		BIT(4)},
107 	{"SATA_D3",		BIT(5)},
108 	{"UFS0_D3",		BIT(6)},
109 	{"UFS1_D3",		BIT(7)},
110 	{"EMMC_D3",		BIT(8)},
111 	{}
112 };
113 
114 static const struct pmc_bit_map cnp_slps0_dbg1_map[] = {
115 	{"SDIO_PLL_OFF",	BIT(0)},
116 	{"USB2_PLL_OFF",	BIT(1)},
117 	{"AUDIO_PLL_OFF",	BIT(2)},
118 	{"OC_PLL_OFF",		BIT(3)},
119 	{"MAIN_PLL_OFF",	BIT(4)},
120 	{"XOSC_OFF",		BIT(5)},
121 	{"LPC_CLKS_GATED",	BIT(6)},
122 	{"PCIE_CLKREQS_IDLE",	BIT(7)},
123 	{"AUDIO_ROSC_OFF",	BIT(8)},
124 	{"HPET_XOSC_CLK_REQ",	BIT(9)},
125 	{"PMC_ROSC_SLOW_CLK",	BIT(10)},
126 	{"AON2_ROSC_GATED",	BIT(11)},
127 	{"CLKACKS_DEASSERTED",	BIT(12)},
128 	{}
129 };
130 
131 static const struct pmc_bit_map cnp_slps0_dbg2_map[] = {
132 	{"MPHY_CORE_GATED",	BIT(0)},
133 	{"CSME_GATED",		BIT(1)},
134 	{"USB2_SUS_GATED",	BIT(2)},
135 	{"DYN_FLEX_IO_IDLE",	BIT(3)},
136 	{"GBE_NO_LINK",		BIT(4)},
137 	{"THERM_SEN_DISABLED",	BIT(5)},
138 	{"PCIE_LOW_POWER",	BIT(6)},
139 	{"ISH_VNNAON_REQ_ACT",	BIT(7)},
140 	{"ISH_VNN_REQ_ACT",	BIT(8)},
141 	{"CNV_VNNAON_REQ_ACT",	BIT(9)},
142 	{"CNV_VNN_REQ_ACT",	BIT(10)},
143 	{"NPK_VNNON_REQ_ACT",	BIT(11)},
144 	{"PMSYNC_STATE_IDLE",	BIT(12)},
145 	{"ALST_GT_THRES",	BIT(13)},
146 	{"PMC_ARC_PG_READY",	BIT(14)},
147 	{}
148 };
149 
150 const struct pmc_bit_map *cnp_slps0_dbg_maps[] = {
151 	cnp_slps0_dbg0_map,
152 	cnp_slps0_dbg1_map,
153 	cnp_slps0_dbg2_map,
154 	NULL
155 };
156 
157 const struct pmc_bit_map cnp_ltr_show_map[] = {
158 	{"SOUTHPORT_A",		CNP_PMC_LTR_SPA},
159 	{"SOUTHPORT_B",		CNP_PMC_LTR_SPB},
160 	{"SATA",		CNP_PMC_LTR_SATA},
161 	{"GIGABIT_ETHERNET",	CNP_PMC_LTR_GBE},
162 	{"XHCI",		CNP_PMC_LTR_XHCI},
163 	{"Reserved",		CNP_PMC_LTR_RESERVED},
164 	{"ME",			CNP_PMC_LTR_ME},
165 	/* EVA is Enterprise Value Add, doesn't really exist on PCH */
166 	{"EVA",			CNP_PMC_LTR_EVA},
167 	{"SOUTHPORT_C",		CNP_PMC_LTR_SPC},
168 	{"HD_AUDIO",		CNP_PMC_LTR_AZ},
169 	{"CNV",			CNP_PMC_LTR_CNV},
170 	{"LPSS",		CNP_PMC_LTR_LPSS},
171 	{"SOUTHPORT_D",		CNP_PMC_LTR_SPD},
172 	{"SOUTHPORT_E",		CNP_PMC_LTR_SPE},
173 	{"CAMERA",		CNP_PMC_LTR_CAM},
174 	{"ESPI",		CNP_PMC_LTR_ESPI},
175 	{"SCC",			CNP_PMC_LTR_SCC},
176 	{"ISH",			CNP_PMC_LTR_ISH},
177 	{"UFSX2",		CNP_PMC_LTR_UFSX2},
178 	{"EMMC",		CNP_PMC_LTR_EMMC},
179 	/*
180 	 * Check intel_pmc_core_ids[] users of cnp_reg_map for
181 	 * a list of core SoCs using this.
182 	 */
183 	{"WIGIG",		ICL_PMC_LTR_WIGIG},
184 	{"THC0",                TGL_PMC_LTR_THC0},
185 	{"THC1",                TGL_PMC_LTR_THC1},
186 	/* Below two cannot be used for LTR_IGNORE */
187 	{"CURRENT_PLATFORM",	CNP_PMC_LTR_CUR_PLT},
188 	{"AGGREGATED_SYSTEM",	CNP_PMC_LTR_CUR_ASLT},
189 	{}
190 };
191 
192 const struct pmc_reg_map cnp_reg_map = {
193 	.pfear_sts = ext_cnp_pfear_map,
194 	.slp_s0_offset = CNP_PMC_SLP_S0_RES_COUNTER_OFFSET,
195 	.slp_s0_res_counter_step = SPT_PMC_SLP_S0_RES_COUNTER_STEP,
196 	.slps0_dbg_maps = cnp_slps0_dbg_maps,
197 	.ltr_show_sts = cnp_ltr_show_map,
198 	.msr_sts = msr_map,
199 	.slps0_dbg_offset = CNP_PMC_SLPS0_DBG_OFFSET,
200 	.ltr_ignore_offset = CNP_PMC_LTR_IGNORE_OFFSET,
201 	.regmap_length = CNP_PMC_MMIO_REG_LEN,
202 	.ppfear0_offset = CNP_PMC_HOST_PPFEAR0A,
203 	.ppfear_buckets = CNP_PPFEAR_NUM_ENTRIES,
204 	.pm_cfg_offset = CNP_PMC_PM_CFG_OFFSET,
205 	.pm_read_disable_bit = CNP_PMC_READ_DISABLE_BIT,
206 	.ltr_ignore_max = CNP_NUM_IP_IGN_ALLOWED,
207 	.etr3_offset = ETR3_OFFSET,
208 };
209 
210 
211 /*
212  * Disable C1 auto-demotion
213  *
214  * Aggressive C1 auto-demotion may lead to failure to enter the deepest C-state
215  * during suspend-to-idle, causing high power consumption. To prevent this, we
216  * disable C1 auto-demotion during suspend and re-enable on resume.
217  *
218  * Note that, although MSR_PKG_CST_CONFIG_CONTROL has 'package' in its name, it
219  * is actually a per-core MSR on client platforms, affecting only a single CPU.
220  * Therefore, it must be configured on all online CPUs. The online cpu mask is
221  * unchanged during the phase of suspend/resume as user space is frozen.
222  */
223 
224 static DEFINE_PER_CPU(u64, pkg_cst_config);
225 
disable_c1_auto_demote(void * unused)226 static void disable_c1_auto_demote(void *unused)
227 {
228 	int cpunum = smp_processor_id();
229 	u64 val;
230 
231 	rdmsrq(MSR_PKG_CST_CONFIG_CONTROL, val);
232 	per_cpu(pkg_cst_config, cpunum) = val;
233 	val &= ~NHM_C1_AUTO_DEMOTE;
234 	wrmsrq(MSR_PKG_CST_CONFIG_CONTROL, val);
235 
236 	pr_debug("%s: cpu:%d cst %llx\n", __func__, cpunum, val);
237 }
238 
restore_c1_auto_demote(void * unused)239 static void restore_c1_auto_demote(void *unused)
240 {
241 	int cpunum = smp_processor_id();
242 
243 	wrmsrq(MSR_PKG_CST_CONFIG_CONTROL, per_cpu(pkg_cst_config, cpunum));
244 
245 	pr_debug("%s: cpu:%d cst %llx\n", __func__, cpunum,
246 		 per_cpu(pkg_cst_config, cpunum));
247 }
248 
s2idle_cpu_quirk(smp_call_func_t func)249 static void s2idle_cpu_quirk(smp_call_func_t func)
250 {
251 	if (pm_suspend_via_firmware())
252 		return;
253 
254 	on_each_cpu(func, NULL, true);
255 }
256 
cnl_suspend(struct pmc_dev * pmcdev)257 void cnl_suspend(struct pmc_dev *pmcdev)
258 {
259 	s2idle_cpu_quirk(disable_c1_auto_demote);
260 
261 	/*
262 	 * Due to a hardware limitation, the GBE LTR blocks PC10
263 	 * when a cable is attached. To unblock PC10 during suspend,
264 	 * tell the PMC to ignore it.
265 	 */
266 	pmc_core_send_ltr_ignore(pmcdev, 3, 1);
267 }
268 
cnl_resume(struct pmc_dev * pmcdev)269 int cnl_resume(struct pmc_dev *pmcdev)
270 {
271 	s2idle_cpu_quirk(restore_c1_auto_demote);
272 
273 	pmc_core_send_ltr_ignore(pmcdev, 3, 0);
274 
275 	return pmc_core_resume_common(pmcdev);
276 }
277 
278 struct pmc_dev_info cnp_pmc_dev = {
279 	.map = &cnp_reg_map,
280 	.suspend = cnl_suspend,
281 	.resume = cnl_resume,
282 };
283 
284