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linux-zen-server/drivers/soc/imx/imx8mp-blk-ctrl.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/interconnect.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <dt-bindings/power/imx8mp-power.h>
#define GPR_REG0 0x0
#define PCIE_CLOCK_MODULE_EN BIT(0)
#define USB_CLOCK_MODULE_EN BIT(1)
#define PCIE_PHY_APB_RST BIT(4)
#define PCIE_PHY_INIT_RST BIT(5)
#define GPR_REG1 0x4
#define PLL_LOCK BIT(13)
#define GPR_REG2 0x8
#define P_PLL_MASK GENMASK(5, 0)
#define M_PLL_MASK GENMASK(15, 6)
#define S_PLL_MASK GENMASK(18, 16)
#define GPR_REG3 0xc
#define PLL_CKE BIT(17)
#define PLL_RST BIT(31)
struct imx8mp_blk_ctrl_domain;
struct imx8mp_blk_ctrl {
struct device *dev;
struct notifier_block power_nb;
struct device *bus_power_dev;
struct regmap *regmap;
struct imx8mp_blk_ctrl_domain *domains;
struct genpd_onecell_data onecell_data;
void (*power_off) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
void (*power_on) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
};
struct imx8mp_blk_ctrl_domain_data {
const char *name;
const char * const *clk_names;
int num_clks;
const char * const *path_names;
int num_paths;
const char *gpc_name;
};
#define DOMAIN_MAX_CLKS 2
#define DOMAIN_MAX_PATHS 3
struct imx8mp_blk_ctrl_domain {
struct generic_pm_domain genpd;
const struct imx8mp_blk_ctrl_domain_data *data;
struct clk_bulk_data clks[DOMAIN_MAX_CLKS];
struct icc_bulk_data paths[DOMAIN_MAX_PATHS];
struct device *power_dev;
struct imx8mp_blk_ctrl *bc;
int num_paths;
int id;
};
struct imx8mp_blk_ctrl_data {
int max_reg;
int (*probe) (struct imx8mp_blk_ctrl *bc);
notifier_fn_t power_notifier_fn;
void (*power_off) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
void (*power_on) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
const struct imx8mp_blk_ctrl_domain_data *domains;
int num_domains;
};
static inline struct imx8mp_blk_ctrl_domain *
to_imx8mp_blk_ctrl_domain(struct generic_pm_domain *genpd)
{
return container_of(genpd, struct imx8mp_blk_ctrl_domain, genpd);
}
struct clk_hsio_pll {
struct clk_hw hw;
struct regmap *regmap;
};
static inline struct clk_hsio_pll *to_clk_hsio_pll(struct clk_hw *hw)
{
return container_of(hw, struct clk_hsio_pll, hw);
}
static int clk_hsio_pll_prepare(struct clk_hw *hw)
{
struct clk_hsio_pll *clk = to_clk_hsio_pll(hw);
u32 val;
/* set the PLL configuration */
regmap_update_bits(clk->regmap, GPR_REG2,
P_PLL_MASK | M_PLL_MASK | S_PLL_MASK,
FIELD_PREP(P_PLL_MASK, 12) |
FIELD_PREP(M_PLL_MASK, 800) |
FIELD_PREP(S_PLL_MASK, 4));
/* de-assert PLL reset */
regmap_update_bits(clk->regmap, GPR_REG3, PLL_RST, PLL_RST);
/* enable PLL */
regmap_update_bits(clk->regmap, GPR_REG3, PLL_CKE, PLL_CKE);
return regmap_read_poll_timeout(clk->regmap, GPR_REG1, val,
val & PLL_LOCK, 10, 100);
}
static void clk_hsio_pll_unprepare(struct clk_hw *hw)
{
struct clk_hsio_pll *clk = to_clk_hsio_pll(hw);
regmap_update_bits(clk->regmap, GPR_REG3, PLL_RST | PLL_CKE, 0);
}
static int clk_hsio_pll_is_prepared(struct clk_hw *hw)
{
struct clk_hsio_pll *clk = to_clk_hsio_pll(hw);
return regmap_test_bits(clk->regmap, GPR_REG1, PLL_LOCK);
}
static unsigned long clk_hsio_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return 100000000;
}
static const struct clk_ops clk_hsio_pll_ops = {
.prepare = clk_hsio_pll_prepare,
.unprepare = clk_hsio_pll_unprepare,
.is_prepared = clk_hsio_pll_is_prepared,
.recalc_rate = clk_hsio_pll_recalc_rate,
};
static int imx8mp_hsio_blk_ctrl_probe(struct imx8mp_blk_ctrl *bc)
{
struct clk_hsio_pll *clk_hsio_pll;
struct clk_hw *hw;
struct clk_init_data init = {};
int ret;
clk_hsio_pll = devm_kzalloc(bc->dev, sizeof(*clk_hsio_pll), GFP_KERNEL);
if (!clk_hsio_pll)
return -ENOMEM;
init.name = "hsio_pll";
init.ops = &clk_hsio_pll_ops;
init.parent_names = (const char *[]){"osc_24m"};
init.num_parents = 1;
clk_hsio_pll->regmap = bc->regmap;
clk_hsio_pll->hw.init = &init;
hw = &clk_hsio_pll->hw;
ret = devm_clk_hw_register(bc->dev, hw);
if (ret)
return ret;
return devm_of_clk_add_hw_provider(bc->dev, of_clk_hw_simple_get, hw);
}
static void imx8mp_hsio_blk_ctrl_power_on(struct imx8mp_blk_ctrl *bc,
struct imx8mp_blk_ctrl_domain *domain)
{
switch (domain->id) {
case IMX8MP_HSIOBLK_PD_USB:
regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
break;
case IMX8MP_HSIOBLK_PD_PCIE:
regmap_set_bits(bc->regmap, GPR_REG0, PCIE_CLOCK_MODULE_EN);
break;
case IMX8MP_HSIOBLK_PD_PCIE_PHY:
regmap_set_bits(bc->regmap, GPR_REG0,
PCIE_PHY_APB_RST | PCIE_PHY_INIT_RST);
break;
default:
break;
}
}
static void imx8mp_hsio_blk_ctrl_power_off(struct imx8mp_blk_ctrl *bc,
struct imx8mp_blk_ctrl_domain *domain)
{
switch (domain->id) {
case IMX8MP_HSIOBLK_PD_USB:
regmap_clear_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
break;
case IMX8MP_HSIOBLK_PD_PCIE:
regmap_clear_bits(bc->regmap, GPR_REG0, PCIE_CLOCK_MODULE_EN);
break;
case IMX8MP_HSIOBLK_PD_PCIE_PHY:
regmap_clear_bits(bc->regmap, GPR_REG0,
PCIE_PHY_APB_RST | PCIE_PHY_INIT_RST);
break;
default:
break;
}
}
static int imx8mp_hsio_power_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct imx8mp_blk_ctrl *bc = container_of(nb, struct imx8mp_blk_ctrl,
power_nb);
struct clk_bulk_data *usb_clk = bc->domains[IMX8MP_HSIOBLK_PD_USB].clks;
int num_clks = bc->domains[IMX8MP_HSIOBLK_PD_USB].data->num_clks;
int ret;
switch (action) {
case GENPD_NOTIFY_ON:
/*
* enable USB clock for a moment for the power-on ADB handshake
* to proceed
*/
ret = clk_bulk_prepare_enable(num_clks, usb_clk);
if (ret)
return NOTIFY_BAD;
regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
udelay(5);
regmap_clear_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
clk_bulk_disable_unprepare(num_clks, usb_clk);
break;
case GENPD_NOTIFY_PRE_OFF:
/* enable USB clock for the power-down ADB handshake to work */
ret = clk_bulk_prepare_enable(num_clks, usb_clk);
if (ret)
return NOTIFY_BAD;
regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
break;
case GENPD_NOTIFY_OFF:
clk_bulk_disable_unprepare(num_clks, usb_clk);
break;
default:
break;
}
return NOTIFY_OK;
}
static const struct imx8mp_blk_ctrl_domain_data imx8mp_hsio_domain_data[] = {
[IMX8MP_HSIOBLK_PD_USB] = {
.name = "hsioblk-usb",
.clk_names = (const char *[]){ "usb" },
.num_clks = 1,
.gpc_name = "usb",
.path_names = (const char *[]){"usb1", "usb2"},
.num_paths = 2,
},
[IMX8MP_HSIOBLK_PD_USB_PHY1] = {
.name = "hsioblk-usb-phy1",
.gpc_name = "usb-phy1",
},
[IMX8MP_HSIOBLK_PD_USB_PHY2] = {
.name = "hsioblk-usb-phy2",
.gpc_name = "usb-phy2",
},
[IMX8MP_HSIOBLK_PD_PCIE] = {
.name = "hsioblk-pcie",
.clk_names = (const char *[]){ "pcie" },
.num_clks = 1,
.gpc_name = "pcie",
.path_names = (const char *[]){"noc-pcie", "pcie"},
.num_paths = 2,
},
[IMX8MP_HSIOBLK_PD_PCIE_PHY] = {
.name = "hsioblk-pcie-phy",
.gpc_name = "pcie-phy",
},
};
static const struct imx8mp_blk_ctrl_data imx8mp_hsio_blk_ctl_dev_data = {
.max_reg = 0x24,
.probe = imx8mp_hsio_blk_ctrl_probe,
.power_on = imx8mp_hsio_blk_ctrl_power_on,
.power_off = imx8mp_hsio_blk_ctrl_power_off,
.power_notifier_fn = imx8mp_hsio_power_notifier,
.domains = imx8mp_hsio_domain_data,
.num_domains = ARRAY_SIZE(imx8mp_hsio_domain_data),
};
#define HDMI_RTX_RESET_CTL0 0x20
#define HDMI_RTX_CLK_CTL0 0x40
#define HDMI_RTX_CLK_CTL1 0x50
#define HDMI_RTX_CLK_CTL2 0x60
#define HDMI_RTX_CLK_CTL3 0x70
#define HDMI_RTX_CLK_CTL4 0x80
#define HDMI_TX_CONTROL0 0x200
#define HDMI_LCDIF_NOC_HURRY_MASK GENMASK(14, 12)
static void imx8mp_hdmi_blk_ctrl_power_on(struct imx8mp_blk_ctrl *bc,
struct imx8mp_blk_ctrl_domain *domain)
{
switch (domain->id) {
case IMX8MP_HDMIBLK_PD_IRQSTEER:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(9));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(16));
break;
case IMX8MP_HDMIBLK_PD_LCDIF:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0,
BIT(16) | BIT(17) | BIT(18) |
BIT(19) | BIT(20));
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(11));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
BIT(4) | BIT(5) | BIT(6));
regmap_set_bits(bc->regmap, HDMI_TX_CONTROL0,
FIELD_PREP(HDMI_LCDIF_NOC_HURRY_MASK, 7));
break;
case IMX8MP_HDMIBLK_PD_PAI:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(17));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(18));
break;
case IMX8MP_HDMIBLK_PD_PVI:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(28));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(22));
break;
case IMX8MP_HDMIBLK_PD_TRNG:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(27) | BIT(30));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(20));
break;
case IMX8MP_HDMIBLK_PD_HDMI_TX:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0,
BIT(2) | BIT(4) | BIT(5));
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1,
BIT(12) | BIT(13) | BIT(14) | BIT(15) | BIT(16) |
BIT(18) | BIT(19) | BIT(20) | BIT(21));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
BIT(7) | BIT(10) | BIT(11));
regmap_set_bits(bc->regmap, HDMI_TX_CONTROL0, BIT(1));
break;
case IMX8MP_HDMIBLK_PD_HDMI_TX_PHY:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(7));
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(22) | BIT(24));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(12));
regmap_clear_bits(bc->regmap, HDMI_TX_CONTROL0, BIT(3));
break;
case IMX8MP_HDMIBLK_PD_HDCP:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(11));
break;
case IMX8MP_HDMIBLK_PD_HRV:
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(3) | BIT(4) | BIT(5));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(15));
break;
default:
break;
}
}
static void imx8mp_hdmi_blk_ctrl_power_off(struct imx8mp_blk_ctrl *bc,
struct imx8mp_blk_ctrl_domain *domain)
{
switch (domain->id) {
case IMX8MP_HDMIBLK_PD_IRQSTEER:
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(9));
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(16));
break;
case IMX8MP_HDMIBLK_PD_LCDIF:
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
BIT(4) | BIT(5) | BIT(6));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(11));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0,
BIT(16) | BIT(17) | BIT(18) |
BIT(19) | BIT(20));
break;
case IMX8MP_HDMIBLK_PD_PAI:
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(18));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(17));
break;
case IMX8MP_HDMIBLK_PD_PVI:
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(22));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(28));
break;
case IMX8MP_HDMIBLK_PD_TRNG:
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(20));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(27) | BIT(30));
break;
case IMX8MP_HDMIBLK_PD_HDMI_TX:
regmap_clear_bits(bc->regmap, HDMI_TX_CONTROL0, BIT(1));
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
BIT(7) | BIT(10) | BIT(11));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1,
BIT(12) | BIT(13) | BIT(14) | BIT(15) | BIT(16) |
BIT(18) | BIT(19) | BIT(20) | BIT(21));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0,
BIT(2) | BIT(4) | BIT(5));
break;
case IMX8MP_HDMIBLK_PD_HDMI_TX_PHY:
regmap_set_bits(bc->regmap, HDMI_TX_CONTROL0, BIT(3));
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(12));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(7));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(22) | BIT(24));
break;
case IMX8MP_HDMIBLK_PD_HDCP:
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(11));
break;
case IMX8MP_HDMIBLK_PD_HRV:
regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(15));
regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(3) | BIT(4) | BIT(5));
break;
default:
break;
}
}
static int imx8mp_hdmi_power_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct imx8mp_blk_ctrl *bc = container_of(nb, struct imx8mp_blk_ctrl,
power_nb);
if (action != GENPD_NOTIFY_ON)
return NOTIFY_OK;
/*
* Contrary to other blk-ctrls the reset and clock don't clear when the
* power domain is powered down. To ensure the proper reset pulsing,
* first clear them all to asserted state, then enable the bus clocks
* and then release the ADB reset.
*/
regmap_write(bc->regmap, HDMI_RTX_RESET_CTL0, 0x0);
regmap_write(bc->regmap, HDMI_RTX_CLK_CTL0, 0x0);
regmap_write(bc->regmap, HDMI_RTX_CLK_CTL1, 0x0);
regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0,
BIT(0) | BIT(1) | BIT(10));
regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, BIT(0));
/*
* On power up we have no software backchannel to the GPC to
* wait for the ADB handshake to happen, so we just delay for a
* bit. On power down the GPC driver waits for the handshake.
*/
udelay(5);
return NOTIFY_OK;
}
static const struct imx8mp_blk_ctrl_domain_data imx8mp_hdmi_domain_data[] = {
[IMX8MP_HDMIBLK_PD_IRQSTEER] = {
.name = "hdmiblk-irqsteer",
.clk_names = (const char *[]){ "apb" },
.num_clks = 1,
.gpc_name = "irqsteer",
},
[IMX8MP_HDMIBLK_PD_LCDIF] = {
.name = "hdmiblk-lcdif",
.clk_names = (const char *[]){ "axi", "apb" },
.num_clks = 2,
.gpc_name = "lcdif",
.path_names = (const char *[]){"lcdif-hdmi"},
.num_paths = 1,
},
[IMX8MP_HDMIBLK_PD_PAI] = {
.name = "hdmiblk-pai",
.clk_names = (const char *[]){ "apb" },
.num_clks = 1,
.gpc_name = "pai",
},
[IMX8MP_HDMIBLK_PD_PVI] = {
.name = "hdmiblk-pvi",
.clk_names = (const char *[]){ "apb" },
.num_clks = 1,
.gpc_name = "pvi",
},
[IMX8MP_HDMIBLK_PD_TRNG] = {
.name = "hdmiblk-trng",
.clk_names = (const char *[]){ "apb" },
.num_clks = 1,
.gpc_name = "trng",
},
[IMX8MP_HDMIBLK_PD_HDMI_TX] = {
.name = "hdmiblk-hdmi-tx",
.clk_names = (const char *[]){ "apb", "ref_266m" },
.num_clks = 2,
.gpc_name = "hdmi-tx",
},
[IMX8MP_HDMIBLK_PD_HDMI_TX_PHY] = {
.name = "hdmiblk-hdmi-tx-phy",
.clk_names = (const char *[]){ "apb", "ref_24m" },
.num_clks = 2,
.gpc_name = "hdmi-tx-phy",
},
[IMX8MP_HDMIBLK_PD_HRV] = {
.name = "hdmiblk-hrv",
.clk_names = (const char *[]){ "axi", "apb" },
.num_clks = 2,
.gpc_name = "hrv",
.path_names = (const char *[]){"hrv"},
.num_paths = 1,
},
[IMX8MP_HDMIBLK_PD_HDCP] = {
.name = "hdmiblk-hdcp",
.clk_names = (const char *[]){ "axi", "apb" },
.num_clks = 2,
.gpc_name = "hdcp",
.path_names = (const char *[]){"hdcp"},
.num_paths = 1,
},
};
static const struct imx8mp_blk_ctrl_data imx8mp_hdmi_blk_ctl_dev_data = {
.max_reg = 0x23c,
.power_on = imx8mp_hdmi_blk_ctrl_power_on,
.power_off = imx8mp_hdmi_blk_ctrl_power_off,
.power_notifier_fn = imx8mp_hdmi_power_notifier,
.domains = imx8mp_hdmi_domain_data,
.num_domains = ARRAY_SIZE(imx8mp_hdmi_domain_data),
};
static int imx8mp_blk_ctrl_power_on(struct generic_pm_domain *genpd)
{
struct imx8mp_blk_ctrl_domain *domain = to_imx8mp_blk_ctrl_domain(genpd);
const struct imx8mp_blk_ctrl_domain_data *data = domain->data;
struct imx8mp_blk_ctrl *bc = domain->bc;
int ret;
/* make sure bus domain is awake */
ret = pm_runtime_resume_and_get(bc->bus_power_dev);
if (ret < 0) {
dev_err(bc->dev, "failed to power up bus domain\n");
return ret;
}
/* enable upstream clocks */
ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);
if (ret) {
dev_err(bc->dev, "failed to enable clocks\n");
goto bus_put;
}
/* domain specific blk-ctrl manipulation */
bc->power_on(bc, domain);
/* power up upstream GPC domain */
ret = pm_runtime_resume_and_get(domain->power_dev);
if (ret < 0) {
dev_err(bc->dev, "failed to power up peripheral domain\n");
goto clk_disable;
}
ret = icc_bulk_set_bw(domain->num_paths, domain->paths);
if (ret)
dev_err(bc->dev, "failed to set icc bw\n");
clk_bulk_disable_unprepare(data->num_clks, domain->clks);
return 0;
clk_disable:
clk_bulk_disable_unprepare(data->num_clks, domain->clks);
bus_put:
pm_runtime_put(bc->bus_power_dev);
return ret;
}
static int imx8mp_blk_ctrl_power_off(struct generic_pm_domain *genpd)
{
struct imx8mp_blk_ctrl_domain *domain = to_imx8mp_blk_ctrl_domain(genpd);
const struct imx8mp_blk_ctrl_domain_data *data = domain->data;
struct imx8mp_blk_ctrl *bc = domain->bc;
int ret;
ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);
if (ret) {
dev_err(bc->dev, "failed to enable clocks\n");
return ret;
}
/* domain specific blk-ctrl manipulation */
bc->power_off(bc, domain);
clk_bulk_disable_unprepare(data->num_clks, domain->clks);
/* power down upstream GPC domain */
pm_runtime_put(domain->power_dev);
/* allow bus domain to suspend */
pm_runtime_put(bc->bus_power_dev);
return 0;
}
static struct lock_class_key blk_ctrl_genpd_lock_class;
static int imx8mp_blk_ctrl_probe(struct platform_device *pdev)
{
const struct imx8mp_blk_ctrl_data *bc_data;
struct device *dev = &pdev->dev;
struct imx8mp_blk_ctrl *bc;
void __iomem *base;
int num_domains, i, ret;
struct regmap_config regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
bc = devm_kzalloc(dev, sizeof(*bc), GFP_KERNEL);
if (!bc)
return -ENOMEM;
bc->dev = dev;
bc_data = of_device_get_match_data(dev);
num_domains = bc_data->num_domains;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
regmap_config.max_register = bc_data->max_reg;
bc->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
if (IS_ERR(bc->regmap))
return dev_err_probe(dev, PTR_ERR(bc->regmap),
"failed to init regmap\n");
bc->domains = devm_kcalloc(dev, num_domains,
sizeof(struct imx8mp_blk_ctrl_domain),
GFP_KERNEL);
if (!bc->domains)
return -ENOMEM;
bc->onecell_data.num_domains = num_domains;
bc->onecell_data.domains =
devm_kcalloc(dev, num_domains,
sizeof(struct generic_pm_domain *), GFP_KERNEL);
if (!bc->onecell_data.domains)
return -ENOMEM;
bc->bus_power_dev = genpd_dev_pm_attach_by_name(dev, "bus");
if (IS_ERR(bc->bus_power_dev))
return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev),
"failed to attach bus power domain\n");
bc->power_off = bc_data->power_off;
bc->power_on = bc_data->power_on;
for (i = 0; i < num_domains; i++) {
const struct imx8mp_blk_ctrl_domain_data *data = &bc_data->domains[i];
struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
int j;
domain->data = data;
domain->num_paths = data->num_paths;
for (j = 0; j < data->num_clks; j++)
domain->clks[j].id = data->clk_names[j];
for (j = 0; j < data->num_paths; j++) {
domain->paths[j].name = data->path_names[j];
/* Fake value for now, just let ICC could configure NoC mode/priority */
domain->paths[j].avg_bw = 1;
domain->paths[j].peak_bw = 1;
}
ret = devm_of_icc_bulk_get(dev, data->num_paths, domain->paths);
if (ret) {
if (ret != -EPROBE_DEFER) {
dev_warn_once(dev, "Could not get interconnect paths, NoC will stay unconfigured!\n");
domain->num_paths = 0;
} else {
dev_err_probe(dev, ret, "failed to get noc entries\n");
goto cleanup_pds;
}
}
ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
if (ret) {
dev_err_probe(dev, ret, "failed to get clock\n");
goto cleanup_pds;
}
domain->power_dev =
dev_pm_domain_attach_by_name(dev, data->gpc_name);
if (IS_ERR(domain->power_dev)) {
dev_err_probe(dev, PTR_ERR(domain->power_dev),
"failed to attach power domain %s\n",
data->gpc_name);
ret = PTR_ERR(domain->power_dev);
goto cleanup_pds;
}
domain->genpd.name = data->name;
domain->genpd.power_on = imx8mp_blk_ctrl_power_on;
domain->genpd.power_off = imx8mp_blk_ctrl_power_off;
domain->bc = bc;
domain->id = i;
ret = pm_genpd_init(&domain->genpd, NULL, true);
if (ret) {
dev_err_probe(dev, ret, "failed to init power domain\n");
dev_pm_domain_detach(domain->power_dev, true);
goto cleanup_pds;
}
/*
* We use runtime PM to trigger power on/off of the upstream GPC
* domain, as a strict hierarchical parent/child power domain
* setup doesn't allow us to meet the sequencing requirements.
* This means we have nested locking of genpd locks, without the
* nesting being visible at the genpd level, so we need a
* separate lock class to make lockdep aware of the fact that
* this are separate domain locks that can be nested without a
* self-deadlock.
*/
lockdep_set_class(&domain->genpd.mlock,
&blk_ctrl_genpd_lock_class);
bc->onecell_data.domains[i] = &domain->genpd;
}
ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
if (ret) {
dev_err_probe(dev, ret, "failed to add power domain provider\n");
goto cleanup_pds;
}
bc->power_nb.notifier_call = bc_data->power_notifier_fn;
ret = dev_pm_genpd_add_notifier(bc->bus_power_dev, &bc->power_nb);
if (ret) {
dev_err_probe(dev, ret, "failed to add power notifier\n");
goto cleanup_provider;
}
if (bc_data->probe) {
ret = bc_data->probe(bc);
if (ret)
goto cleanup_provider;
}
dev_set_drvdata(dev, bc);
return 0;
cleanup_provider:
of_genpd_del_provider(dev->of_node);
cleanup_pds:
for (i--; i >= 0; i--) {
pm_genpd_remove(&bc->domains[i].genpd);
dev_pm_domain_detach(bc->domains[i].power_dev, true);
}
dev_pm_domain_detach(bc->bus_power_dev, true);
return ret;
}
static int imx8mp_blk_ctrl_remove(struct platform_device *pdev)
{
struct imx8mp_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
int i;
of_genpd_del_provider(pdev->dev.of_node);
for (i = 0; bc->onecell_data.num_domains; i++) {
struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
pm_genpd_remove(&domain->genpd);
dev_pm_domain_detach(domain->power_dev, true);
}
dev_pm_genpd_remove_notifier(bc->bus_power_dev);
dev_pm_domain_detach(bc->bus_power_dev, true);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int imx8mp_blk_ctrl_suspend(struct device *dev)
{
struct imx8mp_blk_ctrl *bc = dev_get_drvdata(dev);
int ret, i;
/*
* This may look strange, but is done so the generic PM_SLEEP code
* can power down our domains and more importantly power them up again
* after resume, without tripping over our usage of runtime PM to
* control the upstream GPC domains. Things happen in the right order
* in the system suspend/resume paths due to the device parent/child
* hierarchy.
*/
ret = pm_runtime_get_sync(bc->bus_power_dev);
if (ret < 0) {
pm_runtime_put_noidle(bc->bus_power_dev);
return ret;
}
for (i = 0; i < bc->onecell_data.num_domains; i++) {
struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
ret = pm_runtime_get_sync(domain->power_dev);
if (ret < 0) {
pm_runtime_put_noidle(domain->power_dev);
goto out_fail;
}
}
return 0;
out_fail:
for (i--; i >= 0; i--)
pm_runtime_put(bc->domains[i].power_dev);
pm_runtime_put(bc->bus_power_dev);
return ret;
}
static int imx8mp_blk_ctrl_resume(struct device *dev)
{
struct imx8mp_blk_ctrl *bc = dev_get_drvdata(dev);
int i;
for (i = 0; i < bc->onecell_data.num_domains; i++)
pm_runtime_put(bc->domains[i].power_dev);
pm_runtime_put(bc->bus_power_dev);
return 0;
}
#endif
static const struct dev_pm_ops imx8mp_blk_ctrl_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(imx8mp_blk_ctrl_suspend,
imx8mp_blk_ctrl_resume)
};
static const struct of_device_id imx8mp_blk_ctrl_of_match[] = {
{
.compatible = "fsl,imx8mp-hsio-blk-ctrl",
.data = &imx8mp_hsio_blk_ctl_dev_data,
}, {
.compatible = "fsl,imx8mp-hdmi-blk-ctrl",
.data = &imx8mp_hdmi_blk_ctl_dev_data,
}, {
/* Sentinel */
}
};
MODULE_DEVICE_TABLE(of, imx8m_blk_ctrl_of_match);
static struct platform_driver imx8mp_blk_ctrl_driver = {
.probe = imx8mp_blk_ctrl_probe,
.remove = imx8mp_blk_ctrl_remove,
.driver = {
.name = "imx8mp-blk-ctrl",
.pm = &imx8mp_blk_ctrl_pm_ops,
.of_match_table = imx8mp_blk_ctrl_of_match,
},
};
module_platform_driver(imx8mp_blk_ctrl_driver);