2 * Copyright 2017 Impinj, Inc
3 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
5 * Based on the code of analogus driver:
7 * Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
9 * The code contained herein is licensed under the GNU General Public
10 * License. You may obtain a copy of the GNU General Public License
11 * Version 2 or later at the following locations:
13 * http://www.opensource.org/licenses/gpl-license.html
14 * http://www.gnu.org/copyleft/gpl.html
17 #include <linux/platform_device.h>
18 #include <linux/pm_domain.h>
19 #include <linux/regmap.h>
20 #include <linux/regulator/consumer.h>
21 #include <dt-bindings/power/imx7-power.h>
23 #define GPC_LPCR_A7_BSC 0x000
25 #define GPC_PGC_CPU_MAPPING 0x0ec
26 #define USB_HSIC_PHY_A7_DOMAIN BIT(6)
27 #define USB_OTG2_PHY_A7_DOMAIN BIT(5)
28 #define USB_OTG1_PHY_A7_DOMAIN BIT(4)
29 #define PCIE_PHY_A7_DOMAIN BIT(3)
30 #define MIPI_PHY_A7_DOMAIN BIT(2)
32 #define GPC_PU_PGC_SW_PUP_REQ 0x0f8
33 #define GPC_PU_PGC_SW_PDN_REQ 0x104
34 #define USB_HSIC_PHY_SW_Pxx_REQ BIT(4)
35 #define USB_OTG2_PHY_SW_Pxx_REQ BIT(3)
36 #define USB_OTG1_PHY_SW_Pxx_REQ BIT(2)
37 #define PCIE_PHY_SW_Pxx_REQ BIT(1)
38 #define MIPI_PHY_SW_Pxx_REQ BIT(0)
40 #define GPC_M4_PU_PDN_FLG 0x1bc
45 #define PGC_USB_HSIC 8
46 #define GPC_PGC_CTRL(n) (0x800 + (n) * 0x40)
47 #define GPC_PGC_SR(n) (GPC_PGC_CTRL(n) + 0xc)
49 #define GPC_PGC_CTRL_PCR BIT(0)
51 struct imx7_pgc_domain
{
52 struct generic_pm_domain genpd
;
53 struct regmap
*regmap
;
54 struct regulator
*regulator
;
67 static int imx7_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain
*genpd
,
70 struct imx7_pgc_domain
*domain
= container_of(genpd
,
71 struct imx7_pgc_domain
,
73 unsigned int offset
= on
?
74 GPC_PU_PGC_SW_PUP_REQ
: GPC_PU_PGC_SW_PDN_REQ
;
75 const bool enable_power_control
= !on
;
76 const bool has_regulator
= !IS_ERR(domain
->regulator
);
77 unsigned long deadline
;
80 regmap_update_bits(domain
->regmap
, GPC_PGC_CPU_MAPPING
,
81 domain
->bits
.map
, domain
->bits
.map
);
83 if (has_regulator
&& on
) {
84 ret
= regulator_enable(domain
->regulator
);
86 dev_err(domain
->dev
, "failed to enable regulator\n");
91 if (enable_power_control
)
92 regmap_update_bits(domain
->regmap
, GPC_PGC_CTRL(domain
->pgc
),
93 GPC_PGC_CTRL_PCR
, GPC_PGC_CTRL_PCR
);
95 regmap_update_bits(domain
->regmap
, offset
,
96 domain
->bits
.pxx
, domain
->bits
.pxx
);
99 * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait
100 * for PUP_REQ/PDN_REQ bit to be cleared
102 deadline
= jiffies
+ msecs_to_jiffies(1);
106 regmap_read(domain
->regmap
, offset
, &pxx_req
);
108 if (!(pxx_req
& domain
->bits
.pxx
))
111 if (time_after(jiffies
, deadline
)) {
112 dev_err(domain
->dev
, "falied to command PGC\n");
115 * If we were in a process of enabling a
116 * domain and failed we might as well disable
117 * the regulator we just enabled. And if it
118 * was the opposite situation and we failed to
119 * power down -- keep the regulator on
128 if (enable_power_control
)
129 regmap_update_bits(domain
->regmap
, GPC_PGC_CTRL(domain
->pgc
),
130 GPC_PGC_CTRL_PCR
, 0);
132 if (has_regulator
&& !on
) {
135 err
= regulator_disable(domain
->regulator
);
138 "failed to disable regulator: %d\n", ret
);
139 /* Preserve earlier error code */
143 regmap_update_bits(domain
->regmap
, GPC_PGC_CPU_MAPPING
,
144 domain
->bits
.map
, 0);
148 static int imx7_gpc_pu_pgc_sw_pup_req(struct generic_pm_domain
*genpd
)
150 return imx7_gpc_pu_pgc_sw_pxx_req(genpd
, true);
153 static int imx7_gpc_pu_pgc_sw_pdn_req(struct generic_pm_domain
*genpd
)
155 return imx7_gpc_pu_pgc_sw_pxx_req(genpd
, false);
158 static struct imx7_pgc_domain imx7_pgc_domains
[] = {
159 [IMX7_POWER_DOMAIN_MIPI_PHY
] = {
164 .pxx
= MIPI_PHY_SW_Pxx_REQ
,
165 .map
= MIPI_PHY_A7_DOMAIN
,
171 [IMX7_POWER_DOMAIN_PCIE_PHY
] = {
176 .pxx
= PCIE_PHY_SW_Pxx_REQ
,
177 .map
= PCIE_PHY_A7_DOMAIN
,
183 [IMX7_POWER_DOMAIN_USB_HSIC_PHY
] = {
185 .name
= "usb-hsic-phy",
188 .pxx
= USB_HSIC_PHY_SW_Pxx_REQ
,
189 .map
= USB_HSIC_PHY_A7_DOMAIN
,
196 static int imx7_pgc_domain_probe(struct platform_device
*pdev
)
198 struct imx7_pgc_domain
*domain
= pdev
->dev
.platform_data
;
201 domain
->dev
= &pdev
->dev
;
203 ret
= pm_genpd_init(&domain
->genpd
, NULL
, true);
205 dev_err(domain
->dev
, "Failed to init power domain\n");
209 domain
->regulator
= devm_regulator_get_optional(domain
->dev
, "power");
210 if (IS_ERR(domain
->regulator
)) {
211 if (PTR_ERR(domain
->regulator
) != -ENODEV
) {
212 dev_err(domain
->dev
, "Failed to get domain's regulator\n");
213 return PTR_ERR(domain
->regulator
);
216 regulator_set_voltage(domain
->regulator
,
217 domain
->voltage
, domain
->voltage
);
220 ret
= of_genpd_add_provider_simple(domain
->dev
->of_node
,
223 dev_err(domain
->dev
, "Failed to add genpd provider\n");
224 pm_genpd_remove(&domain
->genpd
);
230 static int imx7_pgc_domain_remove(struct platform_device
*pdev
)
232 struct imx7_pgc_domain
*domain
= pdev
->dev
.platform_data
;
234 of_genpd_del_provider(domain
->dev
->of_node
);
235 pm_genpd_remove(&domain
->genpd
);
240 static const struct platform_device_id imx7_pgc_domain_id
[] = {
241 { "imx7-pgc-domain", },
245 static struct platform_driver imx7_pgc_domain_driver
= {
249 .probe
= imx7_pgc_domain_probe
,
250 .remove
= imx7_pgc_domain_remove
,
251 .id_table
= imx7_pgc_domain_id
,
253 builtin_platform_driver(imx7_pgc_domain_driver
)
255 static int imx_gpcv2_probe(struct platform_device
*pdev
)
257 static const struct regmap_range yes_ranges
[] = {
258 regmap_reg_range(GPC_LPCR_A7_BSC
,
260 regmap_reg_range(GPC_PGC_CTRL(PGC_MIPI
),
261 GPC_PGC_SR(PGC_MIPI
)),
262 regmap_reg_range(GPC_PGC_CTRL(PGC_PCIE
),
263 GPC_PGC_SR(PGC_PCIE
)),
264 regmap_reg_range(GPC_PGC_CTRL(PGC_USB_HSIC
),
265 GPC_PGC_SR(PGC_USB_HSIC
)),
267 static const struct regmap_access_table access_table
= {
268 .yes_ranges
= yes_ranges
,
269 .n_yes_ranges
= ARRAY_SIZE(yes_ranges
),
271 static const struct regmap_config regmap_config
= {
275 .rd_table
= &access_table
,
276 .wr_table
= &access_table
,
277 .max_register
= SZ_4K
,
279 struct device
*dev
= &pdev
->dev
;
280 struct device_node
*pgc_np
, *np
;
281 struct regmap
*regmap
;
282 struct resource
*res
;
286 pgc_np
= of_get_child_by_name(dev
->of_node
, "pgc");
288 dev_err(dev
, "No power domains specified in DT\n");
292 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
293 base
= devm_ioremap_resource(dev
, res
);
295 return PTR_ERR(base
);
297 regmap
= devm_regmap_init_mmio(dev
, base
, ®map_config
);
298 if (IS_ERR(regmap
)) {
299 ret
= PTR_ERR(regmap
);
300 dev_err(dev
, "failed to init regmap (%d)\n", ret
);
304 for_each_child_of_node(pgc_np
, np
) {
305 struct platform_device
*pd_pdev
;
306 struct imx7_pgc_domain
*domain
;
309 ret
= of_property_read_u32(np
, "reg", &domain_index
);
311 dev_err(dev
, "Failed to read 'reg' property\n");
316 if (domain_index
>= ARRAY_SIZE(imx7_pgc_domains
)) {
318 "Domain index %d is out of bounds\n",
323 domain
= &imx7_pgc_domains
[domain_index
];
324 domain
->regmap
= regmap
;
325 domain
->genpd
.power_on
= imx7_gpc_pu_pgc_sw_pup_req
;
326 domain
->genpd
.power_off
= imx7_gpc_pu_pgc_sw_pdn_req
;
328 pd_pdev
= platform_device_alloc("imx7-pgc-domain",
331 dev_err(dev
, "Failed to allocate platform device\n");
336 pd_pdev
->dev
.platform_data
= domain
;
337 pd_pdev
->dev
.parent
= dev
;
338 pd_pdev
->dev
.of_node
= np
;
340 ret
= platform_device_add(pd_pdev
);
342 platform_device_put(pd_pdev
);
351 static const struct of_device_id imx_gpcv2_dt_ids
[] = {
352 { .compatible
= "fsl,imx7d-gpc" },
356 static struct platform_driver imx_gpc_driver
= {
359 .of_match_table
= imx_gpcv2_dt_ids
,
361 .probe
= imx_gpcv2_probe
,
363 builtin_platform_driver(imx_gpc_driver
)