123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Power domain driver for Broadcom BCM2835
- *
- * Copyright (C) 2018 Broadcom
- */
- #include <dt-bindings/soc/bcm2835-pm.h>
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/io.h>
- #include <linux/mfd/bcm2835-pm.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/pm_domain.h>
- #include <linux/reset-controller.h>
- #include <linux/types.h>
- #define PM_GNRIC 0x00
- #define PM_AUDIO 0x04
- #define PM_STATUS 0x18
- #define PM_RSTC 0x1c
- #define PM_RSTS 0x20
- #define PM_WDOG 0x24
- #define PM_PADS0 0x28
- #define PM_PADS2 0x2c
- #define PM_PADS3 0x30
- #define PM_PADS4 0x34
- #define PM_PADS5 0x38
- #define PM_PADS6 0x3c
- #define PM_CAM0 0x44
- #define PM_CAM0_LDOHPEN BIT(2)
- #define PM_CAM0_LDOLPEN BIT(1)
- #define PM_CAM0_CTRLEN BIT(0)
- #define PM_CAM1 0x48
- #define PM_CAM1_LDOHPEN BIT(2)
- #define PM_CAM1_LDOLPEN BIT(1)
- #define PM_CAM1_CTRLEN BIT(0)
- #define PM_CCP2TX 0x4c
- #define PM_CCP2TX_LDOEN BIT(1)
- #define PM_CCP2TX_CTRLEN BIT(0)
- #define PM_DSI0 0x50
- #define PM_DSI0_LDOHPEN BIT(2)
- #define PM_DSI0_LDOLPEN BIT(1)
- #define PM_DSI0_CTRLEN BIT(0)
- #define PM_DSI1 0x54
- #define PM_DSI1_LDOHPEN BIT(2)
- #define PM_DSI1_LDOLPEN BIT(1)
- #define PM_DSI1_CTRLEN BIT(0)
- #define PM_HDMI 0x58
- #define PM_HDMI_RSTDR BIT(19)
- #define PM_HDMI_LDOPD BIT(1)
- #define PM_HDMI_CTRLEN BIT(0)
- #define PM_USB 0x5c
- /* The power gates must be enabled with this bit before enabling the LDO in the
- * USB block.
- */
- #define PM_USB_CTRLEN BIT(0)
- #define PM_PXLDO 0x60
- #define PM_PXBG 0x64
- #define PM_DFT 0x68
- #define PM_SMPS 0x6c
- #define PM_XOSC 0x70
- #define PM_SPAREW 0x74
- #define PM_SPARER 0x78
- #define PM_AVS_RSTDR 0x7c
- #define PM_AVS_STAT 0x80
- #define PM_AVS_EVENT 0x84
- #define PM_AVS_INTEN 0x88
- #define PM_DUMMY 0xfc
- #define PM_IMAGE 0x108
- #define PM_GRAFX 0x10c
- #define PM_PROC 0x110
- #define PM_ENAB BIT(12)
- #define PM_ISPRSTN BIT(8)
- #define PM_H264RSTN BIT(7)
- #define PM_PERIRSTN BIT(6)
- #define PM_V3DRSTN BIT(6)
- #define PM_ISFUNC BIT(5)
- #define PM_MRDONE BIT(4)
- #define PM_MEMREP BIT(3)
- #define PM_ISPOW BIT(2)
- #define PM_POWOK BIT(1)
- #define PM_POWUP BIT(0)
- #define PM_INRUSH_SHIFT 13
- #define PM_INRUSH_3_5_MA 0
- #define PM_INRUSH_5_MA 1
- #define PM_INRUSH_10_MA 2
- #define PM_INRUSH_20_MA 3
- #define PM_INRUSH_MASK (3 << PM_INRUSH_SHIFT)
- #define PM_PASSWORD 0x5a000000
- #define PM_WDOG_TIME_SET 0x000fffff
- #define PM_RSTC_WRCFG_CLR 0xffffffcf
- #define PM_RSTS_HADWRH_SET 0x00000040
- #define PM_RSTC_WRCFG_SET 0x00000030
- #define PM_RSTC_WRCFG_FULL_RESET 0x00000020
- #define PM_RSTC_RESET 0x00000102
- #define PM_READ(reg) readl(power->base + (reg))
- #define PM_WRITE(reg, val) writel(PM_PASSWORD | (val), power->base + (reg))
- #define ASB_BRDG_VERSION 0x00
- #define ASB_CPR_CTRL 0x04
- #define ASB_V3D_S_CTRL 0x08
- #define ASB_V3D_M_CTRL 0x0c
- #define ASB_ISP_S_CTRL 0x10
- #define ASB_ISP_M_CTRL 0x14
- #define ASB_H264_S_CTRL 0x18
- #define ASB_H264_M_CTRL 0x1c
- #define ASB_REQ_STOP BIT(0)
- #define ASB_ACK BIT(1)
- #define ASB_EMPTY BIT(2)
- #define ASB_FULL BIT(3)
- #define ASB_AXI_BRDG_ID 0x20
- #define ASB_READ(reg) readl(power->asb + (reg))
- #define ASB_WRITE(reg, val) writel(PM_PASSWORD | (val), power->asb + (reg))
- struct bcm2835_power_domain {
- struct generic_pm_domain base;
- struct bcm2835_power *power;
- u32 domain;
- struct clk *clk;
- };
- struct bcm2835_power {
- struct device *dev;
- /* PM registers. */
- void __iomem *base;
- /* AXI Async bridge registers. */
- void __iomem *asb;
- struct genpd_onecell_data pd_xlate;
- struct bcm2835_power_domain domains[BCM2835_POWER_DOMAIN_COUNT];
- struct reset_controller_dev reset;
- };
- static int bcm2835_asb_enable(struct bcm2835_power *power, u32 reg)
- {
- u64 start;
- if (!reg)
- return 0;
- start = ktime_get_ns();
- /* Enable the module's async AXI bridges. */
- ASB_WRITE(reg, ASB_READ(reg) & ~ASB_REQ_STOP);
- while (ASB_READ(reg) & ASB_ACK) {
- cpu_relax();
- if (ktime_get_ns() - start >= 1000)
- return -ETIMEDOUT;
- }
- return 0;
- }
- static int bcm2835_asb_disable(struct bcm2835_power *power, u32 reg)
- {
- u64 start;
- if (!reg)
- return 0;
- start = ktime_get_ns();
- /* Enable the module's async AXI bridges. */
- ASB_WRITE(reg, ASB_READ(reg) | ASB_REQ_STOP);
- while (!(ASB_READ(reg) & ASB_ACK)) {
- cpu_relax();
- if (ktime_get_ns() - start >= 1000)
- return -ETIMEDOUT;
- }
- return 0;
- }
- static int bcm2835_power_power_off(struct bcm2835_power_domain *pd, u32 pm_reg)
- {
- struct bcm2835_power *power = pd->power;
- /* Enable functional isolation */
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISFUNC);
- /* Enable electrical isolation */
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISPOW);
- /* Open the power switches. */
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_POWUP);
- return 0;
- }
- static int bcm2835_power_power_on(struct bcm2835_power_domain *pd, u32 pm_reg)
- {
- struct bcm2835_power *power = pd->power;
- struct device *dev = power->dev;
- u64 start;
- int ret;
- int inrush;
- bool powok;
- /* If it was already powered on by the fw, leave it that way. */
- if (PM_READ(pm_reg) & PM_POWUP)
- return 0;
- /* Enable power. Allowing too much current at once may result
- * in POWOK never getting set, so start low and ramp it up as
- * necessary to succeed.
- */
- powok = false;
- for (inrush = PM_INRUSH_3_5_MA; inrush <= PM_INRUSH_20_MA; inrush++) {
- PM_WRITE(pm_reg,
- (PM_READ(pm_reg) & ~PM_INRUSH_MASK) |
- (inrush << PM_INRUSH_SHIFT) |
- PM_POWUP);
- start = ktime_get_ns();
- while (!(powok = !!(PM_READ(pm_reg) & PM_POWOK))) {
- cpu_relax();
- if (ktime_get_ns() - start >= 3000)
- break;
- }
- }
- if (!powok) {
- dev_err(dev, "Timeout waiting for %s power OK\n",
- pd->base.name);
- ret = -ETIMEDOUT;
- goto err_disable_powup;
- }
- /* Disable electrical isolation */
- PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_ISPOW);
- /* Repair memory */
- PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_MEMREP);
- start = ktime_get_ns();
- while (!(PM_READ(pm_reg) & PM_MRDONE)) {
- cpu_relax();
- if (ktime_get_ns() - start >= 1000) {
- dev_err(dev, "Timeout waiting for %s memory repair\n",
- pd->base.name);
- ret = -ETIMEDOUT;
- goto err_disable_ispow;
- }
- }
- /* Disable functional isolation */
- PM_WRITE(pm_reg, PM_READ(pm_reg) | PM_ISFUNC);
- return 0;
- err_disable_ispow:
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISPOW);
- err_disable_powup:
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~(PM_POWUP | PM_INRUSH_MASK));
- return ret;
- }
- static int bcm2835_asb_power_on(struct bcm2835_power_domain *pd,
- u32 pm_reg,
- u32 asb_m_reg,
- u32 asb_s_reg,
- u32 reset_flags)
- {
- struct bcm2835_power *power = pd->power;
- int ret;
- ret = clk_prepare_enable(pd->clk);
- if (ret) {
- dev_err(power->dev, "Failed to enable clock for %s\n",
- pd->base.name);
- return ret;
- }
- /* Wait 32 clocks for reset to propagate, 1 us will be enough */
- udelay(1);
- clk_disable_unprepare(pd->clk);
- /* Deassert the resets. */
- PM_WRITE(pm_reg, PM_READ(pm_reg) | reset_flags);
- ret = clk_prepare_enable(pd->clk);
- if (ret) {
- dev_err(power->dev, "Failed to enable clock for %s\n",
- pd->base.name);
- goto err_enable_resets;
- }
- ret = bcm2835_asb_enable(power, asb_m_reg);
- if (ret) {
- dev_err(power->dev, "Failed to enable ASB master for %s\n",
- pd->base.name);
- goto err_disable_clk;
- }
- ret = bcm2835_asb_enable(power, asb_s_reg);
- if (ret) {
- dev_err(power->dev, "Failed to enable ASB slave for %s\n",
- pd->base.name);
- goto err_disable_asb_master;
- }
- return 0;
- err_disable_asb_master:
- bcm2835_asb_disable(power, asb_m_reg);
- err_disable_clk:
- clk_disable_unprepare(pd->clk);
- err_enable_resets:
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~reset_flags);
- return ret;
- }
- static int bcm2835_asb_power_off(struct bcm2835_power_domain *pd,
- u32 pm_reg,
- u32 asb_m_reg,
- u32 asb_s_reg,
- u32 reset_flags)
- {
- struct bcm2835_power *power = pd->power;
- int ret;
- ret = bcm2835_asb_disable(power, asb_s_reg);
- if (ret) {
- dev_warn(power->dev, "Failed to disable ASB slave for %s\n",
- pd->base.name);
- return ret;
- }
- ret = bcm2835_asb_disable(power, asb_m_reg);
- if (ret) {
- dev_warn(power->dev, "Failed to disable ASB master for %s\n",
- pd->base.name);
- bcm2835_asb_enable(power, asb_s_reg);
- return ret;
- }
- clk_disable_unprepare(pd->clk);
- /* Assert the resets. */
- PM_WRITE(pm_reg, PM_READ(pm_reg) & ~reset_flags);
- return 0;
- }
- static int bcm2835_power_pd_power_on(struct generic_pm_domain *domain)
- {
- struct bcm2835_power_domain *pd =
- container_of(domain, struct bcm2835_power_domain, base);
- struct bcm2835_power *power = pd->power;
- switch (pd->domain) {
- case BCM2835_POWER_DOMAIN_GRAFX:
- return bcm2835_power_power_on(pd, PM_GRAFX);
- case BCM2835_POWER_DOMAIN_GRAFX_V3D:
- return bcm2835_asb_power_on(pd, PM_GRAFX,
- ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
- PM_V3DRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE:
- return bcm2835_power_power_on(pd, PM_IMAGE);
- case BCM2835_POWER_DOMAIN_IMAGE_PERI:
- return bcm2835_asb_power_on(pd, PM_IMAGE,
- 0, 0,
- PM_PERIRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE_ISP:
- return bcm2835_asb_power_on(pd, PM_IMAGE,
- ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
- PM_ISPRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE_H264:
- return bcm2835_asb_power_on(pd, PM_IMAGE,
- ASB_H264_M_CTRL, ASB_H264_S_CTRL,
- PM_H264RSTN);
- case BCM2835_POWER_DOMAIN_USB:
- PM_WRITE(PM_USB, PM_USB_CTRLEN);
- return 0;
- case BCM2835_POWER_DOMAIN_DSI0:
- PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN);
- PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN | PM_DSI0_LDOHPEN);
- return 0;
- case BCM2835_POWER_DOMAIN_DSI1:
- PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN);
- PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN | PM_DSI1_LDOHPEN);
- return 0;
- case BCM2835_POWER_DOMAIN_CCP2TX:
- PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN);
- PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN | PM_CCP2TX_LDOEN);
- return 0;
- case BCM2835_POWER_DOMAIN_HDMI:
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_RSTDR);
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_CTRLEN);
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_LDOPD);
- usleep_range(100, 200);
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_RSTDR);
- return 0;
- default:
- dev_err(power->dev, "Invalid domain %d\n", pd->domain);
- return -EINVAL;
- }
- }
- static int bcm2835_power_pd_power_off(struct generic_pm_domain *domain)
- {
- struct bcm2835_power_domain *pd =
- container_of(domain, struct bcm2835_power_domain, base);
- struct bcm2835_power *power = pd->power;
- switch (pd->domain) {
- case BCM2835_POWER_DOMAIN_GRAFX:
- return bcm2835_power_power_off(pd, PM_GRAFX);
- case BCM2835_POWER_DOMAIN_GRAFX_V3D:
- return bcm2835_asb_power_off(pd, PM_GRAFX,
- ASB_V3D_M_CTRL, ASB_V3D_S_CTRL,
- PM_V3DRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE:
- return bcm2835_power_power_off(pd, PM_IMAGE);
- case BCM2835_POWER_DOMAIN_IMAGE_PERI:
- return bcm2835_asb_power_off(pd, PM_IMAGE,
- 0, 0,
- PM_PERIRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE_ISP:
- return bcm2835_asb_power_off(pd, PM_IMAGE,
- ASB_ISP_M_CTRL, ASB_ISP_S_CTRL,
- PM_ISPRSTN);
- case BCM2835_POWER_DOMAIN_IMAGE_H264:
- return bcm2835_asb_power_off(pd, PM_IMAGE,
- ASB_H264_M_CTRL, ASB_H264_S_CTRL,
- PM_H264RSTN);
- case BCM2835_POWER_DOMAIN_USB:
- PM_WRITE(PM_USB, 0);
- return 0;
- case BCM2835_POWER_DOMAIN_DSI0:
- PM_WRITE(PM_DSI0, PM_DSI0_CTRLEN);
- PM_WRITE(PM_DSI0, 0);
- return 0;
- case BCM2835_POWER_DOMAIN_DSI1:
- PM_WRITE(PM_DSI1, PM_DSI1_CTRLEN);
- PM_WRITE(PM_DSI1, 0);
- return 0;
- case BCM2835_POWER_DOMAIN_CCP2TX:
- PM_WRITE(PM_CCP2TX, PM_CCP2TX_CTRLEN);
- PM_WRITE(PM_CCP2TX, 0);
- return 0;
- case BCM2835_POWER_DOMAIN_HDMI:
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) | PM_HDMI_LDOPD);
- PM_WRITE(PM_HDMI, PM_READ(PM_HDMI) & ~PM_HDMI_CTRLEN);
- return 0;
- default:
- dev_err(power->dev, "Invalid domain %d\n", pd->domain);
- return -EINVAL;
- }
- }
- static int
- bcm2835_init_power_domain(struct bcm2835_power *power,
- int pd_xlate_index, const char *name)
- {
- struct device *dev = power->dev;
- struct bcm2835_power_domain *dom = &power->domains[pd_xlate_index];
- dom->clk = devm_clk_get(dev->parent, name);
- if (IS_ERR(dom->clk)) {
- int ret = PTR_ERR(dom->clk);
- if (ret == -EPROBE_DEFER)
- return ret;
- /* Some domains don't have a clk, so make sure that we
- * don't deref an error pointer later.
- */
- dom->clk = NULL;
- }
- dom->base.name = name;
- dom->base.power_on = bcm2835_power_pd_power_on;
- dom->base.power_off = bcm2835_power_pd_power_off;
- dom->domain = pd_xlate_index;
- dom->power = power;
- /* XXX: on/off at boot? */
- pm_genpd_init(&dom->base, NULL, true);
- power->pd_xlate.domains[pd_xlate_index] = &dom->base;
- return 0;
- }
- /** bcm2835_reset_reset - Resets a block that has a reset line in the
- * PM block.
- *
- * The consumer of the reset controller must have the power domain up
- * -- there's no reset ability with the power domain down. To reset
- * the sub-block, we just disable its access to memory through the
- * ASB, reset, and re-enable.
- */
- static int bcm2835_reset_reset(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct bcm2835_power *power = container_of(rcdev, struct bcm2835_power,
- reset);
- struct bcm2835_power_domain *pd;
- int ret;
- switch (id) {
- case BCM2835_RESET_V3D:
- pd = &power->domains[BCM2835_POWER_DOMAIN_GRAFX_V3D];
- break;
- case BCM2835_RESET_H264:
- pd = &power->domains[BCM2835_POWER_DOMAIN_IMAGE_H264];
- break;
- case BCM2835_RESET_ISP:
- pd = &power->domains[BCM2835_POWER_DOMAIN_IMAGE_ISP];
- break;
- default:
- dev_err(power->dev, "Bad reset id %ld\n", id);
- return -EINVAL;
- }
- ret = bcm2835_power_pd_power_off(&pd->base);
- if (ret)
- return ret;
- return bcm2835_power_pd_power_on(&pd->base);
- }
- static int bcm2835_reset_status(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct bcm2835_power *power = container_of(rcdev, struct bcm2835_power,
- reset);
- switch (id) {
- case BCM2835_RESET_V3D:
- return !PM_READ(PM_GRAFX & PM_V3DRSTN);
- case BCM2835_RESET_H264:
- return !PM_READ(PM_IMAGE & PM_H264RSTN);
- case BCM2835_RESET_ISP:
- return !PM_READ(PM_IMAGE & PM_ISPRSTN);
- default:
- return -EINVAL;
- }
- }
- static const struct reset_control_ops bcm2835_reset_ops = {
- .reset = bcm2835_reset_reset,
- .status = bcm2835_reset_status,
- };
- static const char *const power_domain_names[] = {
- [BCM2835_POWER_DOMAIN_GRAFX] = "grafx",
- [BCM2835_POWER_DOMAIN_GRAFX_V3D] = "v3d",
- [BCM2835_POWER_DOMAIN_IMAGE] = "image",
- [BCM2835_POWER_DOMAIN_IMAGE_PERI] = "peri_image",
- [BCM2835_POWER_DOMAIN_IMAGE_H264] = "h264",
- [BCM2835_POWER_DOMAIN_IMAGE_ISP] = "isp",
- [BCM2835_POWER_DOMAIN_USB] = "usb",
- [BCM2835_POWER_DOMAIN_DSI0] = "dsi0",
- [BCM2835_POWER_DOMAIN_DSI1] = "dsi1",
- [BCM2835_POWER_DOMAIN_CAM0] = "cam0",
- [BCM2835_POWER_DOMAIN_CAM1] = "cam1",
- [BCM2835_POWER_DOMAIN_CCP2TX] = "ccp2tx",
- [BCM2835_POWER_DOMAIN_HDMI] = "hdmi",
- };
- static int bcm2835_power_probe(struct platform_device *pdev)
- {
- struct bcm2835_pm *pm = dev_get_drvdata(pdev->dev.parent);
- struct device *dev = &pdev->dev;
- struct bcm2835_power *power;
- static const struct {
- int parent, child;
- } domain_deps[] = {
- { BCM2835_POWER_DOMAIN_GRAFX, BCM2835_POWER_DOMAIN_GRAFX_V3D },
- { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_PERI },
- { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_H264 },
- { BCM2835_POWER_DOMAIN_IMAGE, BCM2835_POWER_DOMAIN_IMAGE_ISP },
- { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_USB },
- { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM0 },
- { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM1 },
- };
- int ret = 0, i;
- u32 id;
- power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
- if (!power)
- return -ENOMEM;
- platform_set_drvdata(pdev, power);
- power->dev = dev;
- power->base = pm->base;
- power->asb = pm->asb;
- id = ASB_READ(ASB_AXI_BRDG_ID);
- if (id != 0x62726467 /* "BRDG" */) {
- dev_err(dev, "ASB register ID returned 0x%08x\n", id);
- return -ENODEV;
- }
- power->pd_xlate.domains = devm_kcalloc(dev,
- ARRAY_SIZE(power_domain_names),
- sizeof(*power->pd_xlate.domains),
- GFP_KERNEL);
- if (!power->pd_xlate.domains)
- return -ENOMEM;
- power->pd_xlate.num_domains = ARRAY_SIZE(power_domain_names);
- for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
- ret = bcm2835_init_power_domain(power, i, power_domain_names[i]);
- if (ret)
- goto fail;
- }
- for (i = 0; i < ARRAY_SIZE(domain_deps); i++) {
- pm_genpd_add_subdomain(&power->domains[domain_deps[i].parent].base,
- &power->domains[domain_deps[i].child].base);
- }
- power->reset.owner = THIS_MODULE;
- power->reset.nr_resets = BCM2835_RESET_COUNT;
- power->reset.ops = &bcm2835_reset_ops;
- power->reset.of_node = dev->parent->of_node;
- ret = devm_reset_controller_register(dev, &power->reset);
- if (ret)
- goto fail;
- of_genpd_add_provider_onecell(dev->parent->of_node, &power->pd_xlate);
- dev_info(dev, "Broadcom BCM2835 power domains driver");
- return 0;
- fail:
- for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
- struct generic_pm_domain *dom = &power->domains[i].base;
- if (dom->name)
- pm_genpd_remove(dom);
- }
- return ret;
- }
- static int bcm2835_power_remove(struct platform_device *pdev)
- {
- return 0;
- }
- static struct platform_driver bcm2835_power_driver = {
- .probe = bcm2835_power_probe,
- .remove = bcm2835_power_remove,
- .driver = {
- .name = "bcm2835-power",
- },
- };
- module_platform_driver(bcm2835_power_driver);
- MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
- MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM power domains and reset");
- MODULE_LICENSE("GPL");
|