EljakimHerrewijnen/Openwrt
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

bcm53xx: use the latest submitted version of ILP clock driver

Browse Source 
It switched to syscon to better describe PMU block.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2016-09-13 12:24:36 +02:00
parent e70e3c544a
commit b964196c68
3 changed files with 52 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
target/linux/bcm53xx/config-4.4
View File

@ -209,6 +209,7 @@ CONFIG_LZO_COMPRESS=y
CONFIG_LZO_DECOMPRESS=y
# CONFIG_MDIO_BCM_IPROC is not set
CONFIG_MDIO_BOARDINFO=y
CONFIG_MFD_SYSCON=y
CONFIG_MIGHT_HAVE_CACHE_L2X0=y
CONFIG_MIGHT_HAVE_PCI=y
CONFIG_MODULES_USE_ELF_REL=y
@ -270,6 +271,8 @@ CONFIG_PINCTRL=y
# CONFIG_PL310_ERRATA_769419 is not set
CONFIG_RATIONAL=y
CONFIG_RCU_STALL_COMMON=y
CONFIG_REGMAP=y
CONFIG_REGMAP_MMIO=y
CONFIG_RFS_ACCEL=y
CONFIG_RPS=y
CONFIG_RWSEM_SPIN_ON_OWNER=y

93
target/linux/bcm53xx/patches-4.4/830-clk-bcm-Add-driver-for-BCM53573-ILP-clock.patch
View File

@ -1,20 +1,14 @@
From 1909c8bf322e0bbb068d57c370c5b64906a8c5a7 Mon Sep 17 00:00:00 2001
From 205fc550ceb74f7e8bfcba5c5c7329aa1b34d4ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Fri, 29 Jul 2016 14:48:19 +0200
Subject: [PATCH V6] clk: bcm: Add driver for BCM53573 ILP clock
Subject: [PATCH V8] clk: bcm: Add driver for BCM53573 ILP clock
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This clock is present on BCM53573 devices (including BCM47189) that use
Cortex-A7. ILP is a part of PMU (Power Management Unit) and so it should
be defined as one of its subnodes (subdevices). For more details see
Documentation entry.
Unfortunately there isn't a set of registers related to ILP clock only.
We use registers 0x66c, 0x674 and 0x6dc and between them there are e.g.
"retention*" and "control_ext" regs. This is why this driver maps all
0x1000 B of space.
Cortex-A7. ILP is a part of PMU (Power Management Unit) multi-function
device so we use syscon (and regmap) for it.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
@ -38,17 +32,19 @@ V6: Drop #include <linux/clk.h>
Use _hw_ functions for registering struct clk_hw (new API)
Thanks a lot Stephen!
V7: Use syscon and regmap (thanks Rob!)
V8: Update Documentation (drop unused "reg", unit address)
---
.../bindings/clock/brcm,bcm53573-ilp.txt | 40 ++++++
.../bindings/clock/brcm,bcm53573-ilp.txt | 36 +++++
drivers/clk/bcm/Makefile | 1 +
drivers/clk/bcm/clk-bcm53573-ilp.c | 157 +++++++++++++++++++++
3 files changed, 198 insertions(+)
drivers/clk/bcm/clk-bcm53573-ilp.c | 148 +++++++++++++++++++++
3 files changed, 185 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt
create mode 100644 drivers/clk/bcm/clk-bcm53573-ilp.c
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt
@@ -0,0 +1,40 @@
@@ -0,0 +1,36 @@
+Broadcom BCM53573 ILP clock
+===========================
+
@ -58,32 +54,28 @@ V6: Drop #include <linux/clk.h>
+This binding is used for ILP clock (sometimes referred as "slow clock")
+on Broadcom BCM53573 devices using Cortex-A7 CPU.
+
+This clock is part of PMU (Power Management Unit), a Broadcom's device
+handing power-related aspects. Please note PMU contains more subdevices,
+ILP is only one of them.
+
+ILP's rate has to be calculated on runtime and it depends on ALP clock
+which has to be referenced.
+
+This clock is part of PMU (Power Management Unit), a Broadcom's device
+handing power-related aspects. Its node must be sub-node of the PMU
+device.
+
+Required properties:
+- compatible: "brcm,bcm53573-ilp"
+- reg: iomem address range of PMU (Power Management Unit)
+- reg-names: "pmu", the only needed & supported reg right now
+- clocks: has to reference an ALP clock
+- #clock-cells: should be <0>
+- clock-output-names: from common clock bindings, should contain clock
+ name
+
+Example:
+
+pmu@18012000 {
+ compatible = "simple-bus";
+ ranges = <0x00000000 0x18012000 0x00001000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "simple-mfd", "syscon";
+ reg = <0x18012000 0x00001000>;
+
+ ilp: ilp@0 {
+ ilp {
+ compatible = "brcm,bcm53573-ilp";
+ reg = <0 0x1000>;
+ reg-names = "pmu";
+ clocks = <&alp>;
+ #clock-cells = <0>;
+ clock-output-names = "ilp";
@ -98,7 +90,7 @@ V6: Drop #include <linux/clk.h>
+obj-$(CONFIG_ARCH_BCM_53573) += clk-bcm53573-ilp.o
--- /dev/null
+++ b/drivers/clk/bcm/clk-bcm53573-ilp.c
@@ -0,0 +1,157 @@
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
+ *
@ -110,8 +102,10 @@ V6: Drop #include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define PMU_XTAL_FREQ_RATIO 0x66c
@ -121,15 +115,15 @@ V6: Drop #include <linux/clk.h>
+
+struct bcm53573_ilp {
+ struct clk_hw hw;
+ void __iomem *pmu;
+ struct regmap *regmap;
+};
+
+static int bcm53573_ilp_enable(struct clk_hw *hw)
+{
+ struct bcm53573_ilp *ilp = container_of(hw, struct bcm53573_ilp, hw);
+
+ writel(0x10199, ilp->pmu + PMU_SLOW_CLK_PERIOD);
+ writel(0x10000, ilp->pmu + 0x674);
+ regmap_write(ilp->regmap, PMU_SLOW_CLK_PERIOD, 0x10199);
+ regmap_write(ilp->regmap, 0x674, 0x10000);
+
+ return 0;
+}
@ -138,24 +132,25 @@ V6: Drop #include <linux/clk.h>
+{
+ struct bcm53573_ilp *ilp = container_of(hw, struct bcm53573_ilp, hw);
+
+ writel(0, ilp->pmu + PMU_SLOW_CLK_PERIOD);
+ writel(0, ilp->pmu + 0x674);
+ regmap_write(ilp->regmap, PMU_SLOW_CLK_PERIOD, 0);
+ regmap_write(ilp->regmap, 0x674, 0);
+}
+
+static unsigned long bcm53573_ilp_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct bcm53573_ilp *ilp = container_of(hw, struct bcm53573_ilp, hw);
+ void __iomem *pmu = ilp->pmu;
+ struct regmap *regmap = ilp->regmap;
+ u32 last_val, cur_val;
+ int sum = 0, num = 0, loop_num = 0;
+ int avg;
+
+ /* Enable measurement */
+ writel(XTAL_CTL_EN, pmu + PMU_XTAL_FREQ_RATIO);
+ regmap_write(regmap, PMU_XTAL_FREQ_RATIO, XTAL_CTL_EN);
+
+ /* Read initial value */
+ last_val = readl(pmu + PMU_XTAL_FREQ_RATIO) & XTAL_ALP_PER_4ILP;
+ regmap_read(regmap, PMU_XTAL_FREQ_RATIO, &last_val);
+ last_val &= XTAL_ALP_PER_4ILP;
+
+ /*
+ * At minimum we should loop for a bit to let hardware do the
@ -163,7 +158,8 @@ V6: Drop #include <linux/clk.h>
+ * precision lets try getting 20 different values for and use average.
+ */
+ while (num < 20) {
+ cur_val = readl(pmu + PMU_XTAL_FREQ_RATIO) & XTAL_ALP_PER_4ILP;
+ regmap_read(regmap, PMU_XTAL_FREQ_RATIO, &cur_val);
+ cur_val &= XTAL_ALP_PER_4ILP;
+
+ if (cur_val != last_val) {
+ /* Got different value, use it */
@ -182,7 +178,7 @@ V6: Drop #include <linux/clk.h>
+ }
+
+ /* Disable measurement to save power */
+ writel(0x0, pmu + PMU_XTAL_FREQ_RATIO);
+ regmap_write(regmap, PMU_XTAL_FREQ_RATIO, 0x0);
+
+ avg = sum / num;
+
@ -198,10 +194,8 @@ V6: Drop #include <linux/clk.h>
+static void bcm53573_ilp_init(struct device_node *np)
+{
+ struct bcm53573_ilp *ilp;
+ struct resource res;
+ struct clk_init_data init = { 0 };
+ const char *parent_name;
+ int index;
+ int err;
+
+ ilp = kzalloc(sizeof(*ilp), GFP_KERNEL);
@ -214,18 +208,9 @@ V6: Drop #include <linux/clk.h>
+ goto err_free_ilp;
+ }
+
+ /* TODO: This looks generic, try making it OF helper. */
+ index = of_property_match_string(np, "reg-names", "pmu");
+ if (index < 0) {
+ err = index;
+ goto err_free_ilp;
+ }
+ err = of_address_to_resource(np, index, &res);
+ if (err)
+ goto err_free_ilp;
+ ilp->pmu = ioremap(res.start, resource_size(&res));
+ if (IS_ERR(ilp->pmu)) {
+ err = PTR_ERR(ilp->pmu);
+ ilp->regmap = syscon_node_to_regmap(of_get_parent(np));
+ if (IS_ERR(ilp->regmap)) {
+ err = PTR_ERR(ilp->regmap);
+ goto err_free_ilp;
+ }
+
@ -237,7 +222,7 @@ V6: Drop #include <linux/clk.h>
+ ilp->hw.init = &init;
+ err = clk_hw_register(NULL, &ilp->hw);
+ if (err)
+ goto err_unmap_pmu;
+ goto err_free_ilp;
+
+ err = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &ilp->hw);
+ if (err)
@ -247,8 +232,6 @@ V6: Drop #include <linux/clk.h>
+
+err_clk_hw_unregister:
+ clk_hw_unregister(&ilp->hw);
+err_unmap_pmu:
+ iounmap(ilp->pmu);
+err_free_ilp:
+ kfree(ilp);
+ pr_err("Failed to init ILP clock: %d\n", err);

19
target/linux/bcm53xx/patches-4.4/905-BCM53573-minor-hacks.patch
View File

@ -11,17 +11,20 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
--- a/arch/arm/boot/dts/bcm53573.dtsi
+++ b/arch/arm/boot/dts/bcm53573.dtsi
@@ -44,6 +44,24 @@
@@ -44,6 +44,27 @@
};
};
+ ilp: ilp@0 {
+ compatible = "brcm,bcm53573-ilp";
+ reg = <0x18012000 0x1000>;
+ reg-names = "pmu";
+ clocks = <&alp>;
+ #clock-cells = <0>;
+ clock-output-names = "ilp";
+ pmu@18012000 {
+ compatible = "simple-mfd", "syscon";
+ reg = <0x18012000 0x00001000>;
+
+ ilp: ilp {
+ compatible = "brcm,bcm53573-ilp";
+ clocks = <&alp>;
+ #clock-cells = <0>;
+ clock-output-names = "ilp";
+ };
+ };
+
+ timer {