bcm4908: backport PMB (Power Management Bus) driver

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 406 insertions, 0 deletions

diff --git a/target/linux/bcm4908/patches-5.4/082-v5.12-0002-soc-bcm-add-PM-driver-for-Broadcom-s-PMB.patch b/target/linux/bcm4908/patches-5.4/082-v5.12-0002-soc-bcm-add-PM-driver-for-Broadcom-s-PMB.patch
new file mode 100644
index 0000000000..e462174ca6
--- /dev/null
+++ b/target/linux/bcm4908/patches-5.4/082-v5.12-0002-soc-bcm-add-PM-driver-for-Broadcom-s-PMB.patch
@@ -0,0 +1,406 @@
+From 8bcac4011ebe0dbdd46fd55b036ee855c95702d3 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 14 Dec 2020 19:07:43 +0100
+Subject: [PATCH] soc: bcm: add PM driver for Broadcom's PMB
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+PMB originally comes from BCM63138 but can be also found on many other
+chipsets (e.g. BCM4908). It's needed to power on and off SoC blocks like
+PCIe, SATA, USB.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+---
+ MAINTAINERS                       |  10 +
+ drivers/soc/bcm/Makefile          |   2 +-
+ drivers/soc/bcm/bcm63xx/Kconfig   |   9 +
+ drivers/soc/bcm/bcm63xx/Makefile  |   1 +
+ drivers/soc/bcm/bcm63xx/bcm-pmb.c | 333 ++++++++++++++++++++++++++++++
+ 5 files changed, 354 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/soc/bcm/bcm63xx/bcm-pmb.c
+
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -3405,6 +3405,16 @@ L:	linux-mips@vger.kernel.org
+ S:	Maintained
+ F:	drivers/firmware/broadcom/*
+ 
++BROADCOM PMB (POWER MANAGEMENT BUS) DRIVER
++M:	Rafał Miłecki <rafal@milecki.pl>
++M:	Florian Fainelli <f.fainelli@gmail.com>
++M:	bcm-kernel-feedback-list@broadcom.com
++L:	linux-pm@vger.kernel.org
++S:	Maintained
++T:	git git://github.com/broadcom/stblinux.git
++F:	drivers/soc/bcm/bcm-pmb.c
++F:	include/dt-bindings/soc/bcm-pmb.h
++
+ BROADCOM SPECIFIC AMBA DRIVER (BCMA)
+ M:	Rafał Miłecki <zajec5@gmail.com>
+ L:	linux-wireless@vger.kernel.org
+--- /dev/null
++++ b/drivers/soc/bcm/bcm63xx/Kconfig
+@@ -0,0 +1,9 @@
++# SPDX-License-Identifier: GPL-2.0-only
++config BCM_PMB
++	bool "Broadcom PMB (Power Management Bus) driver"
++	depends on ARCH_BCM4908 || (COMPILE_TEST && OF)
++	default ARCH_BCM4908
++	select PM_GENERIC_DOMAINS if PM
++	help
++	  This enables support for the Broadcom's PMB (Power Management Bus) that
++	  is used for disabling and enabling SoC devices.
+--- /dev/null
++++ b/drivers/soc/bcm/bcm63xx/Makefile
+@@ -0,0 +1,2 @@
++# SPDX-License-Identifier: GPL-2.0-only
++obj-$(CONFIG_BCM_PMB)		+= bcm-pmb.o 
+--- /dev/null
++++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
+@@ -0,0 +1,333 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2013 Broadcom
++ * Copyright (C) 2020 Rafał Miłecki <rafal@milecki.pl>
++ */
++
++#include <dt-bindings/soc/bcm-pmb.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/pm_domain.h>
++#include <linux/reset/bcm63xx_pmb.h>
++
++#define BPCM_ID_REG					0x00
++#define BPCM_CAPABILITIES				0x04
++#define  BPCM_CAP_NUM_ZONES				0x000000ff
++#define  BPCM_CAP_SR_REG_BITS				0x0000ff00
++#define  BPCM_CAP_PLLTYPE				0x00030000
++#define  BPCM_CAP_UBUS					0x00080000
++#define BPCM_CONTROL					0x08
++#define BPCM_STATUS					0x0c
++#define BPCM_ROSC_CONTROL				0x10
++#define BPCM_ROSC_THRESH_H				0x14
++#define BPCM_ROSC_THRESHOLD_BCM6838			0x14
++#define BPCM_ROSC_THRESH_S				0x18
++#define BPCM_ROSC_COUNT_BCM6838				0x18
++#define BPCM_ROSC_COUNT					0x1c
++#define BPCM_PWD_CONTROL_BCM6838			0x1c
++#define BPCM_PWD_CONTROL				0x20
++#define BPCM_SR_CONTROL_BCM6838				0x20
++#define BPCM_PWD_ACCUM_CONTROL				0x24
++#define BPCM_SR_CONTROL					0x28
++#define BPCM_GLOBAL_CONTROL				0x2c
++#define BPCM_MISC_CONTROL				0x30
++#define BPCM_MISC_CONTROL2				0x34
++#define BPCM_SGPHY_CNTL					0x38
++#define BPCM_SGPHY_STATUS				0x3c
++#define BPCM_ZONE0					0x40
++#define  BPCM_ZONE_CONTROL				0x00
++#define   BPCM_ZONE_CONTROL_MANUAL_CLK_EN		0x00000001
++#define   BPCM_ZONE_CONTROL_MANUAL_RESET_CTL		0x00000002
++#define   BPCM_ZONE_CONTROL_FREQ_SCALE_USED		0x00000004	/* R/O */
++#define   BPCM_ZONE_CONTROL_DPG_CAPABLE			0x00000008	/* R/O */
++#define   BPCM_ZONE_CONTROL_MANUAL_MEM_PWR		0x00000030
++#define   BPCM_ZONE_CONTROL_MANUAL_ISO_CTL		0x00000040
++#define   BPCM_ZONE_CONTROL_MANUAL_CTL			0x00000080
++#define   BPCM_ZONE_CONTROL_DPG_CTL_EN			0x00000100
++#define   BPCM_ZONE_CONTROL_PWR_DN_REQ			0x00000200
++#define   BPCM_ZONE_CONTROL_PWR_UP_REQ			0x00000400
++#define   BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN		0x00000800
++#define   BPCM_ZONE_CONTROL_BLK_RESET_ASSERT		0x00001000
++#define   BPCM_ZONE_CONTROL_MEM_STBY			0x00002000
++#define   BPCM_ZONE_CONTROL_RESERVED			0x0007c000
++#define   BPCM_ZONE_CONTROL_PWR_CNTL_STATE		0x00f80000
++#define   BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL		0x01000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_PWR_OFF_STATE		0x02000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_PWR_ON_STATE		0x04000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_PWR_GOOD			0x08000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_DPG_PWR_STATE		0x10000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_MEM_PWR_STATE		0x20000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_ISO_STATE			0x40000000	/* R/O */
++#define   BPCM_ZONE_CONTROL_RESET_STATE			0x80000000	/* R/O */
++#define  BPCM_ZONE_CONFIG1				0x04
++#define  BPCM_ZONE_CONFIG2				0x08
++#define  BPCM_ZONE_FREQ_SCALAR_CONTROL			0x0c
++#define  BPCM_ZONE_SIZE					0x10
++
++struct bcm_pmb {
++	struct device *dev;
++	void __iomem *base;
++	spinlock_t lock;
++	bool little_endian;
++	struct genpd_onecell_data genpd_onecell_data;
++};
++
++struct bcm_pmb_pd_data {
++	const char * const name;
++	int id;
++	u8 bus;
++	u8 device;
++};
++
++struct bcm_pmb_pm_domain {
++	struct bcm_pmb *pmb;
++	const struct bcm_pmb_pd_data *data;
++	struct generic_pm_domain genpd;
++};
++
++static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device,
++			     int offset, u32 *val)
++{
++	void __iomem *base = pmb->base + bus * 0x20;
++	unsigned long flags;
++	int err;
++
++	spin_lock_irqsave(&pmb->lock, flags);
++	err = bpcm_rd(base, device, offset, val);
++	spin_unlock_irqrestore(&pmb->lock, flags);
++
++	if (!err)
++		*val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val);
++
++	return err;
++}
++
++static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device,
++			      int offset, u32 val)
++{
++	void __iomem *base = pmb->base + bus * 0x20;
++	unsigned long flags;
++	int err;
++
++	val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val);
++
++	spin_lock_irqsave(&pmb->lock, flags);
++	err = bpcm_wr(base, device, offset, val);
++	spin_unlock_irqrestore(&pmb->lock, flags);
++
++	return err;
++}
++
++static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device,
++				  int zone)
++{
++	int offset;
++	u32 val;
++	int err;
++
++	offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
++
++	err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
++	if (err)
++		return err;
++
++	val |= BPCM_ZONE_CONTROL_PWR_DN_REQ;
++	val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ;
++
++	err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
++
++	return err;
++}
++
++static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device,
++				 int zone)
++{
++	int offset;
++	u32 val;
++	int err;
++
++	offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
++
++	err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
++	if (err)
++		return err;
++
++	if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) {
++		val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ;
++		val |= BPCM_ZONE_CONTROL_DPG_CTL_EN;
++		val |= BPCM_ZONE_CONTROL_PWR_UP_REQ;
++		val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN;
++		val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT;
++
++		err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
++	}
++
++	return err;
++}
++
++static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device)
++{
++	int offset;
++	u32 val;
++	int err;
++
++	/* Entire device can be powered off by powering off the 0th zone */
++	offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL;
++
++	err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
++	if (err)
++		return err;
++
++	if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) {
++		val = BPCM_ZONE_CONTROL_PWR_DN_REQ;
++
++		err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
++	}
++
++	return err;
++}
++
++static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device)
++{
++	u32 val;
++	int err;
++	int i;
++
++	err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val);
++	if (err)
++		return err;
++
++	for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) {
++		err = bcm_pmb_power_on_zone(pmb, bus, device, i);
++		if (err)
++			return err;
++	}
++
++	return err;
++}
++
++static int bcm_pmb_power_on(struct generic_pm_domain *genpd)
++{
++	struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
++	const struct bcm_pmb_pd_data *data = pd->data;
++	struct bcm_pmb *pmb = pd->pmb;
++
++	switch (data->id) {
++	case BCM_PMB_PCIE0:
++	case BCM_PMB_PCIE1:
++	case BCM_PMB_PCIE2:
++		return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0);
++	case BCM_PMB_HOST_USB:
++		return bcm_pmb_power_on_device(pmb, data->bus, data->device);
++	default:
++		dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
++		return -EINVAL;
++	}
++}
++
++static int bcm_pmb_power_off(struct generic_pm_domain *genpd)
++{
++	struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
++	const struct bcm_pmb_pd_data *data = pd->data;
++	struct bcm_pmb *pmb = pd->pmb;
++
++	switch (data->id) {
++	case BCM_PMB_PCIE0:
++	case BCM_PMB_PCIE1:
++	case BCM_PMB_PCIE2:
++		return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0);
++	case BCM_PMB_HOST_USB:
++		return bcm_pmb_power_off_device(pmb, data->bus, data->device);
++	default:
++		dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
++		return -EINVAL;
++	}
++}
++
++static int bcm_pmb_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	const struct bcm_pmb_pd_data *table;
++	const struct bcm_pmb_pd_data *e;
++	struct resource *res;
++	struct bcm_pmb *pmb;
++	int max_id;
++	int err;
++
++	pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL);
++	if (!pmb)
++		return -ENOMEM;
++
++	pmb->dev = dev;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	pmb->base = devm_ioremap_resource(&pdev->dev, res);
++	if (IS_ERR(pmb->base))
++		return PTR_ERR(pmb->base);
++
++	spin_lock_init(&pmb->lock);
++
++	pmb->little_endian = !of_device_is_big_endian(dev->of_node);
++
++	table = of_device_get_match_data(dev);
++	if (!table)
++		return -EINVAL;
++
++	max_id = 0;
++	for (e = table; e->name; e++)
++		max_id = max(max_id, e->id);
++
++	pmb->genpd_onecell_data.num_domains = max_id + 1;
++	pmb->genpd_onecell_data.domains =
++		devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains,
++			     sizeof(struct generic_pm_domain *), GFP_KERNEL);
++	if (!pmb->genpd_onecell_data.domains)
++		return -ENOMEM;
++
++	for (e = table; e->name; e++) {
++		struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
++
++		pd->pmb = pmb;
++		pd->data = e;
++		pd->genpd.name = e->name;
++		pd->genpd.power_on = bcm_pmb_power_on;
++		pd->genpd.power_off = bcm_pmb_power_off;
++
++		pm_genpd_init(&pd->genpd, NULL, true);
++		pmb->genpd_onecell_data.domains[e->id] = &pd->genpd;
++	}
++
++	err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data);
++	if (err) {
++		dev_err(dev, "failed to add genpd provider: %d\n", err);
++		return err;
++	}
++
++	return 0;
++}
++
++static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = {
++	{ .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, },
++	{ .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, },
++	{ .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, },
++	{ .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, },
++	{ },
++};
++
++static const struct of_device_id bcm_pmb_of_match[] = {
++	{ .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, },
++	{ },
++};
++
++static struct platform_driver bcm_pmb_driver = {
++	.driver = {
++		.name = "bcm-pmb",
++		.of_match_table = bcm_pmb_of_match,
++	},
++	.probe  = bcm_pmb_probe,
++};
++
++builtin_platform_driver(bcm_pmb_driver);
+--- a/drivers/soc/bcm/Kconfig
++++ b/drivers/soc/bcm/Kconfig
+@@ -33,6 +33,7 @@ config SOC_BRCMSTB
+ 
+ 	  If unsure, say N.
+ 
++source "drivers/soc/bcm/bcm63xx/Kconfig"
+ source "drivers/soc/bcm/brcmstb/Kconfig"
+ 
+ endmenu