1 From 8bcac4011ebe0dbdd46fd55b036ee855c95702d3 Mon Sep 17 00:00:00 2001
2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
3 Date: Mon, 14 Dec 2020 19:07:43 +0100
4 Subject: [PATCH] soc: bcm: add PM driver for Broadcom's PMB
6 Content-Type: text/plain; charset=UTF-8
7 Content-Transfer-Encoding: 8bit
9 PMB originally comes from BCM63138 but can be also found on many other
10 chipsets (e.g. BCM4908). It's needed to power on and off SoC blocks like
13 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
14 Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
15 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
18 drivers/soc/bcm/Makefile | 2 +-
19 drivers/soc/bcm/bcm63xx/Kconfig | 9 +
20 drivers/soc/bcm/bcm63xx/Makefile | 1 +
21 drivers/soc/bcm/bcm63xx/bcm-pmb.c | 333 ++++++++++++++++++++++++++++++
22 5 files changed, 354 insertions(+), 1 deletion(-)
23 create mode 100644 drivers/soc/bcm/bcm63xx/bcm-pmb.c
27 @@ -3414,6 +3414,16 @@ L: linux-mips@vger.kernel.org
29 F: drivers/firmware/broadcom/*
31 +BROADCOM PMB (POWER MANAGEMENT BUS) DRIVER
32 +M: Rafał Miłecki <rafal@milecki.pl>
33 +M: Florian Fainelli <f.fainelli@gmail.com>
34 +M: bcm-kernel-feedback-list@broadcom.com
35 +L: linux-pm@vger.kernel.org
37 +T: git git://github.com/broadcom/stblinux.git
38 +F: drivers/soc/bcm/bcm-pmb.c
39 +F: include/dt-bindings/soc/bcm-pmb.h
41 BROADCOM SPECIFIC AMBA DRIVER (BCMA)
42 M: Rafał Miłecki <zajec5@gmail.com>
43 L: linux-wireless@vger.kernel.org
45 +++ b/drivers/soc/bcm/bcm63xx/Kconfig
47 +# SPDX-License-Identifier: GPL-2.0-only
49 + bool "Broadcom PMB (Power Management Bus) driver"
50 + depends on ARCH_BCM4908 || (COMPILE_TEST && OF)
51 + default ARCH_BCM4908
52 + select PM_GENERIC_DOMAINS if PM
54 + This enables support for the Broadcom's PMB (Power Management Bus) that
55 + is used for disabling and enabling SoC devices.
57 +++ b/drivers/soc/bcm/bcm63xx/Makefile
59 +# SPDX-License-Identifier: GPL-2.0-only
60 +obj-$(CONFIG_BCM_PMB) += bcm-pmb.o
62 +++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
64 +// SPDX-License-Identifier: GPL-2.0-or-later
66 + * Copyright (c) 2013 Broadcom
67 + * Copyright (C) 2020 Rafał Miłecki <rafal@milecki.pl>
70 +#include <dt-bindings/soc/bcm-pmb.h>
71 +#include <linux/io.h>
72 +#include <linux/module.h>
73 +#include <linux/of.h>
74 +#include <linux/of_device.h>
75 +#include <linux/platform_device.h>
76 +#include <linux/pm_domain.h>
77 +#include <linux/reset/bcm63xx_pmb.h>
79 +#define BPCM_ID_REG 0x00
80 +#define BPCM_CAPABILITIES 0x04
81 +#define BPCM_CAP_NUM_ZONES 0x000000ff
82 +#define BPCM_CAP_SR_REG_BITS 0x0000ff00
83 +#define BPCM_CAP_PLLTYPE 0x00030000
84 +#define BPCM_CAP_UBUS 0x00080000
85 +#define BPCM_CONTROL 0x08
86 +#define BPCM_STATUS 0x0c
87 +#define BPCM_ROSC_CONTROL 0x10
88 +#define BPCM_ROSC_THRESH_H 0x14
89 +#define BPCM_ROSC_THRESHOLD_BCM6838 0x14
90 +#define BPCM_ROSC_THRESH_S 0x18
91 +#define BPCM_ROSC_COUNT_BCM6838 0x18
92 +#define BPCM_ROSC_COUNT 0x1c
93 +#define BPCM_PWD_CONTROL_BCM6838 0x1c
94 +#define BPCM_PWD_CONTROL 0x20
95 +#define BPCM_SR_CONTROL_BCM6838 0x20
96 +#define BPCM_PWD_ACCUM_CONTROL 0x24
97 +#define BPCM_SR_CONTROL 0x28
98 +#define BPCM_GLOBAL_CONTROL 0x2c
99 +#define BPCM_MISC_CONTROL 0x30
100 +#define BPCM_MISC_CONTROL2 0x34
101 +#define BPCM_SGPHY_CNTL 0x38
102 +#define BPCM_SGPHY_STATUS 0x3c
103 +#define BPCM_ZONE0 0x40
104 +#define BPCM_ZONE_CONTROL 0x00
105 +#define BPCM_ZONE_CONTROL_MANUAL_CLK_EN 0x00000001
106 +#define BPCM_ZONE_CONTROL_MANUAL_RESET_CTL 0x00000002
107 +#define BPCM_ZONE_CONTROL_FREQ_SCALE_USED 0x00000004 /* R/O */
108 +#define BPCM_ZONE_CONTROL_DPG_CAPABLE 0x00000008 /* R/O */
109 +#define BPCM_ZONE_CONTROL_MANUAL_MEM_PWR 0x00000030
110 +#define BPCM_ZONE_CONTROL_MANUAL_ISO_CTL 0x00000040
111 +#define BPCM_ZONE_CONTROL_MANUAL_CTL 0x00000080
112 +#define BPCM_ZONE_CONTROL_DPG_CTL_EN 0x00000100
113 +#define BPCM_ZONE_CONTROL_PWR_DN_REQ 0x00000200
114 +#define BPCM_ZONE_CONTROL_PWR_UP_REQ 0x00000400
115 +#define BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN 0x00000800
116 +#define BPCM_ZONE_CONTROL_BLK_RESET_ASSERT 0x00001000
117 +#define BPCM_ZONE_CONTROL_MEM_STBY 0x00002000
118 +#define BPCM_ZONE_CONTROL_RESERVED 0x0007c000
119 +#define BPCM_ZONE_CONTROL_PWR_CNTL_STATE 0x00f80000
120 +#define BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL 0x01000000 /* R/O */
121 +#define BPCM_ZONE_CONTROL_PWR_OFF_STATE 0x02000000 /* R/O */
122 +#define BPCM_ZONE_CONTROL_PWR_ON_STATE 0x04000000 /* R/O */
123 +#define BPCM_ZONE_CONTROL_PWR_GOOD 0x08000000 /* R/O */
124 +#define BPCM_ZONE_CONTROL_DPG_PWR_STATE 0x10000000 /* R/O */
125 +#define BPCM_ZONE_CONTROL_MEM_PWR_STATE 0x20000000 /* R/O */
126 +#define BPCM_ZONE_CONTROL_ISO_STATE 0x40000000 /* R/O */
127 +#define BPCM_ZONE_CONTROL_RESET_STATE 0x80000000 /* R/O */
128 +#define BPCM_ZONE_CONFIG1 0x04
129 +#define BPCM_ZONE_CONFIG2 0x08
130 +#define BPCM_ZONE_FREQ_SCALAR_CONTROL 0x0c
131 +#define BPCM_ZONE_SIZE 0x10
134 + struct device *dev;
135 + void __iomem *base;
137 + bool little_endian;
138 + struct genpd_onecell_data genpd_onecell_data;
141 +struct bcm_pmb_pd_data {
142 + const char * const name;
148 +struct bcm_pmb_pm_domain {
149 + struct bcm_pmb *pmb;
150 + const struct bcm_pmb_pd_data *data;
151 + struct generic_pm_domain genpd;
154 +static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device,
155 + int offset, u32 *val)
157 + void __iomem *base = pmb->base + bus * 0x20;
158 + unsigned long flags;
161 + spin_lock_irqsave(&pmb->lock, flags);
162 + err = bpcm_rd(base, device, offset, val);
163 + spin_unlock_irqrestore(&pmb->lock, flags);
166 + *val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val);
171 +static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device,
172 + int offset, u32 val)
174 + void __iomem *base = pmb->base + bus * 0x20;
175 + unsigned long flags;
178 + val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val);
180 + spin_lock_irqsave(&pmb->lock, flags);
181 + err = bpcm_wr(base, device, offset, val);
182 + spin_unlock_irqrestore(&pmb->lock, flags);
187 +static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device,
194 + offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
196 + err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
200 + val |= BPCM_ZONE_CONTROL_PWR_DN_REQ;
201 + val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ;
203 + err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
208 +static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device,
215 + offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
217 + err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
221 + if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) {
222 + val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ;
223 + val |= BPCM_ZONE_CONTROL_DPG_CTL_EN;
224 + val |= BPCM_ZONE_CONTROL_PWR_UP_REQ;
225 + val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN;
226 + val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT;
228 + err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
234 +static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device)
240 + /* Entire device can be powered off by powering off the 0th zone */
241 + offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL;
243 + err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
247 + if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) {
248 + val = BPCM_ZONE_CONTROL_PWR_DN_REQ;
250 + err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
256 +static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device)
262 + err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val);
266 + for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) {
267 + err = bcm_pmb_power_on_zone(pmb, bus, device, i);
275 +static int bcm_pmb_power_on(struct generic_pm_domain *genpd)
277 + struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
278 + const struct bcm_pmb_pd_data *data = pd->data;
279 + struct bcm_pmb *pmb = pd->pmb;
281 + switch (data->id) {
282 + case BCM_PMB_PCIE0:
283 + case BCM_PMB_PCIE1:
284 + case BCM_PMB_PCIE2:
285 + return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0);
286 + case BCM_PMB_HOST_USB:
287 + return bcm_pmb_power_on_device(pmb, data->bus, data->device);
289 + dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
294 +static int bcm_pmb_power_off(struct generic_pm_domain *genpd)
296 + struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
297 + const struct bcm_pmb_pd_data *data = pd->data;
298 + struct bcm_pmb *pmb = pd->pmb;
300 + switch (data->id) {
301 + case BCM_PMB_PCIE0:
302 + case BCM_PMB_PCIE1:
303 + case BCM_PMB_PCIE2:
304 + return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0);
305 + case BCM_PMB_HOST_USB:
306 + return bcm_pmb_power_off_device(pmb, data->bus, data->device);
308 + dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
313 +static int bcm_pmb_probe(struct platform_device *pdev)
315 + struct device *dev = &pdev->dev;
316 + const struct bcm_pmb_pd_data *table;
317 + const struct bcm_pmb_pd_data *e;
318 + struct resource *res;
319 + struct bcm_pmb *pmb;
323 + pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL);
329 + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
330 + pmb->base = devm_ioremap_resource(&pdev->dev, res);
331 + if (IS_ERR(pmb->base))
332 + return PTR_ERR(pmb->base);
334 + spin_lock_init(&pmb->lock);
336 + pmb->little_endian = !of_device_is_big_endian(dev->of_node);
338 + table = of_device_get_match_data(dev);
343 + for (e = table; e->name; e++)
344 + max_id = max(max_id, e->id);
346 + pmb->genpd_onecell_data.num_domains = max_id + 1;
347 + pmb->genpd_onecell_data.domains =
348 + devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains,
349 + sizeof(struct generic_pm_domain *), GFP_KERNEL);
350 + if (!pmb->genpd_onecell_data.domains)
353 + for (e = table; e->name; e++) {
354 + struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
358 + pd->genpd.name = e->name;
359 + pd->genpd.power_on = bcm_pmb_power_on;
360 + pd->genpd.power_off = bcm_pmb_power_off;
362 + pm_genpd_init(&pd->genpd, NULL, true);
363 + pmb->genpd_onecell_data.domains[e->id] = &pd->genpd;
366 + err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data);
368 + dev_err(dev, "failed to add genpd provider: %d\n", err);
375 +static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = {
376 + { .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, },
377 + { .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, },
378 + { .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, },
379 + { .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, },
383 +static const struct of_device_id bcm_pmb_of_match[] = {
384 + { .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, },
388 +static struct platform_driver bcm_pmb_driver = {
391 + .of_match_table = bcm_pmb_of_match,
393 + .probe = bcm_pmb_probe,
396 +builtin_platform_driver(bcm_pmb_driver);
397 --- a/drivers/soc/bcm/Kconfig
398 +++ b/drivers/soc/bcm/Kconfig
399 @@ -33,6 +33,7 @@ config SOC_BRCMSTB
403 +source "drivers/soc/bcm/bcm63xx/Kconfig"
404 source "drivers/soc/bcm/brcmstb/Kconfig"
407 --- a/drivers/soc/bcm/Makefile
408 +++ b/drivers/soc/bcm/Makefile
410 # SPDX-License-Identifier: GPL-2.0-only
411 obj-$(CONFIG_BCM2835_POWER) += bcm2835-power.o
412 obj-$(CONFIG_RASPBERRYPI_POWER) += raspberrypi-power.o
414 obj-$(CONFIG_SOC_BRCMSTB) += brcmstb/