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a1383655cf
Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
103 lines
3.2 KiB
Diff
103 lines
3.2 KiB
Diff
From 0cb69292622e3530a72d3173d78c484c8f4d3eab Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Fri, 11 Jan 2019 17:31:07 -0800
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Subject: [PATCH] soc: bcm: bcm2835-pm: Add support for 2711.
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Without the actual power management part any more, there's a lot less
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to set up for V3D. We just need to clear the RSTN field for the power
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domain, and expose the reset controller for toggling it again.
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This is definitely incomplete -- the old ISP and H264 is in the old
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bridge, but since we have no consumers of it I've just done the
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minimum to get V3D working.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/mfd/bcm2835-pm.c | 11 +++++++++++
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drivers/soc/bcm/bcm2835-power.c | 22 ++++++++++++++++++++++
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include/linux/mfd/bcm2835-pm.h | 1 +
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3 files changed, 34 insertions(+)
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--- a/drivers/mfd/bcm2835-pm.c
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+++ b/drivers/mfd/bcm2835-pm.c
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@@ -50,6 +50,17 @@ static int bcm2835_pm_probe(struct platf
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if (ret)
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return ret;
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+ /* Map the ARGON ASB regs if present. */
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
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+ if (res) {
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+ pm->arg_asb = devm_ioremap_resource(dev, res);
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+ if (IS_ERR(pm->arg_asb)) {
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+ dev_err(dev, "Failed to map ARGON ASB: %ld\n",
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+ PTR_ERR(pm->arg_asb));
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+ return PTR_ERR(pm->arg_asb);
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+ }
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+ }
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+
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/* We'll use the presence of the AXI ASB regs in the
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* bcm2835-pm binding as the key for whether we can reference
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* the full PM register range and support power domains.
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--- a/drivers/soc/bcm/bcm2835-power.c
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+++ b/drivers/soc/bcm/bcm2835-power.c
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@@ -143,6 +143,8 @@ struct bcm2835_power {
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/* AXI Async bridge registers. */
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void __iomem *asb;
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+ bool is_2711;
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+
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struct genpd_onecell_data pd_xlate;
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struct bcm2835_power_domain domains[BCM2835_POWER_DOMAIN_COUNT];
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struct reset_controller_dev reset;
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@@ -192,6 +194,10 @@ static int bcm2835_power_power_off(struc
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{
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struct bcm2835_power *power = pd->power;
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+ /* 2711 has no power domains above the reset controller. */
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+ if (power->is_2711)
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+ return 0;
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+
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/* Enable functional isolation */
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PM_WRITE(pm_reg, PM_READ(pm_reg) & ~PM_ISFUNC);
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@@ -213,6 +219,10 @@ static int bcm2835_power_power_on(struct
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int inrush;
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bool powok;
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+ /* 2711 has no power domains above the reset controller. */
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+ if (power->is_2711)
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+ return 0;
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+
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/* If it was already powered on by the fw, leave it that way. */
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if (PM_READ(pm_reg) & PM_POWUP)
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return 0;
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@@ -627,6 +637,18 @@ static int bcm2835_power_probe(struct pl
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power->base = pm->base;
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power->asb = pm->asb;
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+ /* 2711 hack: the new ARGON ASB took over V3D, which is our
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+ * only consumer of this driver so far. The old ASB seems to
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+ * still be present with ISP and H264 bits but no V3D, but I
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+ * don't know if that's real or not. The V3D is in the same
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+ * place in the new ASB as the old one, so just poke the new
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+ * one for now.
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+ */
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+ if (pm->arg_asb) {
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+ power->asb = pm->arg_asb;
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+ power->is_2711 = true;
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+ }
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+
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id = ASB_READ(ASB_AXI_BRDG_ID);
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if (id != 0x62726467 /* "BRDG" */) {
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dev_err(dev, "ASB register ID returned 0x%08x\n", id);
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--- a/include/linux/mfd/bcm2835-pm.h
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+++ b/include/linux/mfd/bcm2835-pm.h
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@@ -9,6 +9,7 @@ struct bcm2835_pm {
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struct device *dev;
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void __iomem *base;
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void __iomem *asb;
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+ void __iomem *arg_asb;
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};
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#endif /* BCM2835_MFD_PM_H */
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