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[194.187.74.233]) by smtp.gmail.com with ESMTPSA id d21sm1026140lfi.137.2020.12.11.13.59.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Dec 2020 13:59:57 -0800 (PST) From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= To: Florian Fainelli , Rob Herring Cc: Philipp Zabel , "Rafael J . Wysocki" , Kevin Hilman , Ulf Hansson , devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Subject: [PATCH 2/2] soc: bcm: add PM driver for Broadcom's PMB Date: Fri, 11 Dec 2020 22:59:42 +0100 Message-Id: <20201211215942.5726-3-zajec5@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201211215942.5726-1-zajec5@gmail.com> References: <20201211215942.5726-1-zajec5@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafał Miłecki PMB can be found on BCM4908 and many other chipsets (e.g. BCM63138). It's needed to power on and off SoC blocks like PCIe, SATA, USB. Signed-off-by: Rafał Miłecki --- drivers/soc/bcm/Kconfig | 8 + drivers/soc/bcm/Makefile | 1 + drivers/soc/bcm/bcm-pmb.c | 335 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 344 insertions(+) create mode 100644 drivers/soc/bcm/bcm-pmb.c diff --git a/drivers/soc/bcm/Kconfig b/drivers/soc/bcm/Kconfig index 24f92a6e882a..327cfbd88471 100644 --- a/drivers/soc/bcm/Kconfig +++ b/drivers/soc/bcm/Kconfig @@ -13,6 +13,14 @@ config BCM2835_POWER firmware means that Linux usage of the same power domain must be accessed using the RASPBERRYPI_POWER driver +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 + Foo + config RASPBERRYPI_POWER bool "Raspberry Pi power domain driver" depends on ARCH_BCM2835 || (COMPILE_TEST && OF) diff --git a/drivers/soc/bcm/Makefile b/drivers/soc/bcm/Makefile index 7bc90e0bd773..c451ee76259f 100644 --- a/drivers/soc/bcm/Makefile +++ b/drivers/soc/bcm/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_BCM2835_POWER) += bcm2835-power.o +obj-$(CONFIG_BCM_PMB) += bcm-pmb.o obj-$(CONFIG_RASPBERRYPI_POWER) += raspberrypi-power.o obj-$(CONFIG_SOC_BCM63XX) += bcm63xx/ obj-$(CONFIG_SOC_BRCMSTB) += brcmstb/ diff --git a/drivers/soc/bcm/bcm-pmb.c b/drivers/soc/bcm/bcm-pmb.c new file mode 100644 index 000000000000..31820e56418d --- /dev/null +++ b/drivers/soc/bcm/bcm-pmb.c @@ -0,0 +1,335 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2013 Broadcom + * Copyright (C) 2020 Rafał Miłecki + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#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; + + dev_info(dev, "START\n"); + + 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); -- 2.26.2