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333 lines
8.9 KiB
333 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2013 Broadcom |
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* Copyright (C) 2020 Rafał Miłecki <[email protected]> |
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*/ |
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#include <dt-bindings/soc/bcm-pmb.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_domain.h> |
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#include <linux/reset/bcm63xx_pmb.h> |
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#define BPCM_ID_REG 0x00 |
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#define BPCM_CAPABILITIES 0x04 |
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#define BPCM_CAP_NUM_ZONES 0x000000ff |
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#define BPCM_CAP_SR_REG_BITS 0x0000ff00 |
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#define BPCM_CAP_PLLTYPE 0x00030000 |
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#define BPCM_CAP_UBUS 0x00080000 |
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#define BPCM_CONTROL 0x08 |
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#define BPCM_STATUS 0x0c |
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#define BPCM_ROSC_CONTROL 0x10 |
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#define BPCM_ROSC_THRESH_H 0x14 |
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#define BPCM_ROSC_THRESHOLD_BCM6838 0x14 |
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#define BPCM_ROSC_THRESH_S 0x18 |
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#define BPCM_ROSC_COUNT_BCM6838 0x18 |
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#define BPCM_ROSC_COUNT 0x1c |
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#define BPCM_PWD_CONTROL_BCM6838 0x1c |
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#define BPCM_PWD_CONTROL 0x20 |
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#define BPCM_SR_CONTROL_BCM6838 0x20 |
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#define BPCM_PWD_ACCUM_CONTROL 0x24 |
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#define BPCM_SR_CONTROL 0x28 |
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#define BPCM_GLOBAL_CONTROL 0x2c |
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#define BPCM_MISC_CONTROL 0x30 |
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#define BPCM_MISC_CONTROL2 0x34 |
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#define BPCM_SGPHY_CNTL 0x38 |
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#define BPCM_SGPHY_STATUS 0x3c |
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#define BPCM_ZONE0 0x40 |
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#define BPCM_ZONE_CONTROL 0x00 |
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#define BPCM_ZONE_CONTROL_MANUAL_CLK_EN 0x00000001 |
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#define BPCM_ZONE_CONTROL_MANUAL_RESET_CTL 0x00000002 |
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#define BPCM_ZONE_CONTROL_FREQ_SCALE_USED 0x00000004 /* R/O */ |
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#define BPCM_ZONE_CONTROL_DPG_CAPABLE 0x00000008 /* R/O */ |
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#define BPCM_ZONE_CONTROL_MANUAL_MEM_PWR 0x00000030 |
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#define BPCM_ZONE_CONTROL_MANUAL_ISO_CTL 0x00000040 |
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#define BPCM_ZONE_CONTROL_MANUAL_CTL 0x00000080 |
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#define BPCM_ZONE_CONTROL_DPG_CTL_EN 0x00000100 |
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#define BPCM_ZONE_CONTROL_PWR_DN_REQ 0x00000200 |
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#define BPCM_ZONE_CONTROL_PWR_UP_REQ 0x00000400 |
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#define BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN 0x00000800 |
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#define BPCM_ZONE_CONTROL_BLK_RESET_ASSERT 0x00001000 |
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#define BPCM_ZONE_CONTROL_MEM_STBY 0x00002000 |
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#define BPCM_ZONE_CONTROL_RESERVED 0x0007c000 |
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#define BPCM_ZONE_CONTROL_PWR_CNTL_STATE 0x00f80000 |
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#define BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL 0x01000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_PWR_OFF_STATE 0x02000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_PWR_ON_STATE 0x04000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_PWR_GOOD 0x08000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_DPG_PWR_STATE 0x10000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_MEM_PWR_STATE 0x20000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_ISO_STATE 0x40000000 /* R/O */ |
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#define BPCM_ZONE_CONTROL_RESET_STATE 0x80000000 /* R/O */ |
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#define BPCM_ZONE_CONFIG1 0x04 |
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#define BPCM_ZONE_CONFIG2 0x08 |
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#define BPCM_ZONE_FREQ_SCALAR_CONTROL 0x0c |
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#define BPCM_ZONE_SIZE 0x10 |
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struct bcm_pmb { |
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struct device *dev; |
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void __iomem *base; |
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spinlock_t lock; |
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bool little_endian; |
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struct genpd_onecell_data genpd_onecell_data; |
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}; |
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struct bcm_pmb_pd_data { |
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const char * const name; |
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int id; |
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u8 bus; |
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u8 device; |
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}; |
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struct bcm_pmb_pm_domain { |
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struct bcm_pmb *pmb; |
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const struct bcm_pmb_pd_data *data; |
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struct generic_pm_domain genpd; |
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}; |
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static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device, |
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int offset, u32 *val) |
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{ |
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void __iomem *base = pmb->base + bus * 0x20; |
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unsigned long flags; |
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int err; |
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spin_lock_irqsave(&pmb->lock, flags); |
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err = bpcm_rd(base, device, offset, val); |
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spin_unlock_irqrestore(&pmb->lock, flags); |
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if (!err) |
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*val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val); |
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return err; |
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} |
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static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device, |
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int offset, u32 val) |
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{ |
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void __iomem *base = pmb->base + bus * 0x20; |
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unsigned long flags; |
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int err; |
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val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val); |
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spin_lock_irqsave(&pmb->lock, flags); |
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err = bpcm_wr(base, device, offset, val); |
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spin_unlock_irqrestore(&pmb->lock, flags); |
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return err; |
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} |
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static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device, |
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int zone) |
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{ |
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int offset; |
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u32 val; |
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int err; |
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offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL; |
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err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); |
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if (err) |
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return err; |
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val |= BPCM_ZONE_CONTROL_PWR_DN_REQ; |
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val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ; |
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err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); |
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return err; |
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} |
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static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device, |
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int zone) |
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{ |
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int offset; |
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u32 val; |
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int err; |
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offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL; |
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err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); |
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if (err) |
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return err; |
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if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) { |
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val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ; |
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val |= BPCM_ZONE_CONTROL_DPG_CTL_EN; |
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val |= BPCM_ZONE_CONTROL_PWR_UP_REQ; |
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val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN; |
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val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT; |
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err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); |
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} |
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return err; |
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} |
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static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device) |
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{ |
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int offset; |
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u32 val; |
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int err; |
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/* Entire device can be powered off by powering off the 0th zone */ |
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offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL; |
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err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); |
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if (err) |
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return err; |
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if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) { |
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val = BPCM_ZONE_CONTROL_PWR_DN_REQ; |
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err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); |
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} |
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return err; |
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} |
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static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device) |
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{ |
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u32 val; |
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int err; |
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int i; |
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err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val); |
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if (err) |
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return err; |
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for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) { |
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err = bcm_pmb_power_on_zone(pmb, bus, device, i); |
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if (err) |
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return err; |
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} |
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return err; |
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} |
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static int bcm_pmb_power_on(struct generic_pm_domain *genpd) |
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{ |
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struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd); |
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const struct bcm_pmb_pd_data *data = pd->data; |
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struct bcm_pmb *pmb = pd->pmb; |
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switch (data->id) { |
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case BCM_PMB_PCIE0: |
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case BCM_PMB_PCIE1: |
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case BCM_PMB_PCIE2: |
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return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0); |
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case BCM_PMB_HOST_USB: |
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return bcm_pmb_power_on_device(pmb, data->bus, data->device); |
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default: |
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dev_err(pmb->dev, "unsupported device id: %d\n", data->id); |
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return -EINVAL; |
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} |
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} |
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static int bcm_pmb_power_off(struct generic_pm_domain *genpd) |
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{ |
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struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd); |
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const struct bcm_pmb_pd_data *data = pd->data; |
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struct bcm_pmb *pmb = pd->pmb; |
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switch (data->id) { |
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case BCM_PMB_PCIE0: |
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case BCM_PMB_PCIE1: |
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case BCM_PMB_PCIE2: |
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return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0); |
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case BCM_PMB_HOST_USB: |
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return bcm_pmb_power_off_device(pmb, data->bus, data->device); |
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default: |
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dev_err(pmb->dev, "unsupported device id: %d\n", data->id); |
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return -EINVAL; |
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} |
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} |
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static int bcm_pmb_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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const struct bcm_pmb_pd_data *table; |
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const struct bcm_pmb_pd_data *e; |
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struct resource *res; |
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struct bcm_pmb *pmb; |
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int max_id; |
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int err; |
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pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL); |
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if (!pmb) |
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return -ENOMEM; |
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pmb->dev = dev; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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pmb->base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(pmb->base)) |
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return PTR_ERR(pmb->base); |
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spin_lock_init(&pmb->lock); |
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pmb->little_endian = !of_device_is_big_endian(dev->of_node); |
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table = of_device_get_match_data(dev); |
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if (!table) |
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return -EINVAL; |
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max_id = 0; |
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for (e = table; e->name; e++) |
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max_id = max(max_id, e->id); |
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pmb->genpd_onecell_data.num_domains = max_id + 1; |
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pmb->genpd_onecell_data.domains = |
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devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains, |
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sizeof(struct generic_pm_domain *), GFP_KERNEL); |
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if (!pmb->genpd_onecell_data.domains) |
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return -ENOMEM; |
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for (e = table; e->name; e++) { |
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struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); |
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pd->pmb = pmb; |
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pd->data = e; |
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pd->genpd.name = e->name; |
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pd->genpd.power_on = bcm_pmb_power_on; |
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pd->genpd.power_off = bcm_pmb_power_off; |
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pm_genpd_init(&pd->genpd, NULL, true); |
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pmb->genpd_onecell_data.domains[e->id] = &pd->genpd; |
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} |
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err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data); |
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if (err) { |
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dev_err(dev, "failed to add genpd provider: %d\n", err); |
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return err; |
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} |
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return 0; |
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} |
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static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = { |
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{ .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, }, |
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{ .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, }, |
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{ .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, }, |
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{ .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, }, |
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{ }, |
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}; |
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static const struct of_device_id bcm_pmb_of_match[] = { |
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{ .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, }, |
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{ }, |
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}; |
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static struct platform_driver bcm_pmb_driver = { |
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.driver = { |
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.name = "bcm-pmb", |
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.of_match_table = bcm_pmb_of_match, |
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}, |
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.probe = bcm_pmb_probe, |
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}; |
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builtin_platform_driver(bcm_pmb_driver);
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