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authorAjit Kumar Pandey <AjitKumar.Pandey@amd.com>2021-12-12 23:35:23 +0530
committerStephen Boyd <sboyd@kernel.org>2022-01-06 17:57:52 -0800
commit65ab884ac9cd8454435b5159ade540004f1a24fe (patch)
tree7377374ecaa453efb33f9f33f2f1ec3661ac646b /drivers
parentff5f87cb6a75dbf6d30668d2464e46249dd5c47f (diff)
x86: clk: clk-fch: Add support for newer family of AMD's SOC
FCH controller clock configuration slightly differs across AMD's SOC architectures. Newer family of SOC only support a 48MHz fix clock while stoney SOC family has a clk_mux to choose 48MHz and 25 MHz clk. At present fixed clk support is only enabled for RV architecture using "is-rv" device property initialized from boot loader. This limit 48MHz fixed clock gate support to RV platform unless we add similar device property in boot loader for other architectures. Add pci_device_id table with Stoney platform id and replace "is-rv" device property check with pci id match to add clk mux support with 25MHz and 48MHz clk support based on clk mux selection. This enable 48Mhz fixed fch clock support by default on all newer SOC's except stoney. Also replace RV with FIXED as a generic naming conventions across all platforms and changed module description. Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com> Reviewed-by: Mario Limonciello <Mario.Limonciello@amd.com> Link: https://lore.kernel.org/r/20211212180527.1641362-2-AjitKumar.Pandey@amd.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/x86/clk-fch.c42
1 files changed, 31 insertions, 11 deletions
diff --git a/drivers/clk/x86/clk-fch.c b/drivers/clk/x86/clk-fch.c
index 8f7c5142b0f0..6a726420bfcb 100644
--- a/drivers/clk/x86/clk-fch.c
+++ b/drivers/clk/x86/clk-fch.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: MIT
/*
- * clock framework for AMD Stoney based clocks
+ * clock framework for AMD FCH controller block
*
* Copyright 2018 Advanced Micro Devices, Inc.
*/
@@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
+#include <linux/pci.h>
#include <linux/platform_data/clk-fch.h>
#include <linux/platform_device.h>
@@ -26,22 +27,37 @@
#define ST_CLK_GATE 3
#define ST_MAX_CLKS 4
-#define RV_CLK_48M 0
-#define RV_CLK_GATE 1
-#define RV_MAX_CLKS 2
+#define CLK_48M_FIXED 0
+#define CLK_GATE_FIXED 1
+#define CLK_MAX_FIXED 2
+
+/* List of supported CPU ids for clk mux with 25Mhz clk support */
+#define AMD_CPU_ID_ST 0x1576
static const char * const clk_oscout1_parents[] = { "clk48MHz", "clk25MHz" };
static struct clk_hw *hws[ST_MAX_CLKS];
+static const struct pci_device_id fch_pci_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_ST) },
+ { }
+};
+
static int fch_clk_probe(struct platform_device *pdev)
{
struct fch_clk_data *fch_data;
+ struct pci_dev *rdev;
fch_data = dev_get_platdata(&pdev->dev);
if (!fch_data || !fch_data->base)
return -EINVAL;
- if (!fch_data->is_rv) {
+ rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
+ if (!rdev) {
+ dev_err(&pdev->dev, "FCH device not found\n");
+ return -ENODEV;
+ }
+
+ if (pci_match_id(fch_pci_ids, rdev)) {
hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
NULL, 0, 48000000);
hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz",
@@ -61,32 +77,36 @@ static int fch_clk_probe(struct platform_device *pdev)
devm_clk_hw_register_clkdev(&pdev->dev, hws[ST_CLK_GATE],
"oscout1", NULL);
} else {
- hws[RV_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
+ hws[CLK_48M_FIXED] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
NULL, 0, 48000000);
- hws[RV_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1",
+ hws[CLK_GATE_FIXED] = clk_hw_register_gate(NULL, "oscout1",
"clk48MHz", 0, fch_data->base + MISCCLKCNTL1,
OSCCLKENB, CLK_GATE_SET_TO_DISABLE, NULL);
- devm_clk_hw_register_clkdev(&pdev->dev, hws[RV_CLK_GATE],
+ devm_clk_hw_register_clkdev(&pdev->dev, hws[CLK_GATE_FIXED],
"oscout1", NULL);
}
+ pci_dev_put(rdev);
return 0;
}
static int fch_clk_remove(struct platform_device *pdev)
{
int i, clks;
- struct fch_clk_data *fch_data;
+ struct pci_dev *rdev;
- fch_data = dev_get_platdata(&pdev->dev);
+ rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
+ if (!rdev)
+ return -ENODEV;
- clks = fch_data->is_rv ? RV_MAX_CLKS : ST_MAX_CLKS;
+ clks = pci_match_id(fch_pci_ids, rdev) ? CLK_MAX_FIXED : ST_MAX_CLKS;
for (i = 0; i < clks; i++)
clk_hw_unregister(hws[i]);
+ pci_dev_put(rdev);
return 0;
}