mirror of
https://github.com/Ysurac/openmptcprouter.git
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96 lines
3.2 KiB
Diff
96 lines
3.2 KiB
Diff
From 836f1d81b54c84f1f5a95af302fc8662a7502d14 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Tue, 20 Sep 2022 13:49:10 +0200
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Subject: [PATCH] firmware: raspberrypi: Provide a helper to query a clock max
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rate
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The firmware allows to query for its clocks the operating range of a
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given clock. We'll need this for some drivers (KMS, in particular) to
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infer the state of some configuration options, so let's create a
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function to do so.
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Acked-by: Stephen Boyd <sboyd@kernel.org>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/firmware/raspberrypi.c | 20 +++++++++++++++++
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include/soc/bcm2835/raspberrypi-firmware.h | 26 ++++++++++++++++++++++
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2 files changed, 46 insertions(+)
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--- a/drivers/firmware/raspberrypi.c
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+++ b/drivers/firmware/raspberrypi.c
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@@ -342,6 +342,26 @@ static void rpi_register_clk_driver(stru
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-1, NULL, 0);
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}
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+unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw, unsigned int id)
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+{
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+ struct rpi_firmware_clk_rate_request msg =
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+ RPI_FIRMWARE_CLK_RATE_REQUEST(id);
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+ int ret;
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+
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+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_MAX_CLOCK_RATE,
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+ &msg, sizeof(msg));
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+ if (ret)
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+ /*
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+ * If our firmware doesn't support that operation, or fails, we
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+ * assume the maximum clock rate is absolute maximum we can
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+ * store over our type.
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+ */
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+ return UINT_MAX;
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+
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+ return le32_to_cpu(msg.rate);
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+}
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+EXPORT_SYMBOL_GPL(rpi_firmware_clk_get_max_rate);
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+
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static void rpi_firmware_delete(struct kref *kref)
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{
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struct rpi_firmware *fw = container_of(kref, struct rpi_firmware,
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--- a/include/soc/bcm2835/raspberrypi-firmware.h
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+++ b/include/soc/bcm2835/raspberrypi-firmware.h
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@@ -181,12 +181,32 @@ enum rpi_firmware_clk_id {
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#define GET_DISPLAY_SETTINGS_PAYLOAD_SIZE 64
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+/**
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+ * struct rpi_firmware_clk_rate_request - Firmware Request for a rate
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+ * @id: ID of the clock being queried
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+ * @rate: Rate in Hertz. Set by the firmware.
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+ *
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+ * Used by @RPI_FIRMWARE_GET_CLOCK_RATE, @RPI_FIRMWARE_GET_CLOCK_MEASURED,
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+ * @RPI_FIRMWARE_GET_MAX_CLOCK_RATE and @RPI_FIRMWARE_GET_MIN_CLOCK_RATE.
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+ */
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+struct rpi_firmware_clk_rate_request {
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+ __le32 id;
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+ __le32 rate;
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+} __packed;
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+
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+#define RPI_FIRMWARE_CLK_RATE_REQUEST(_id) \
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+ { \
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+ .id = _id, \
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+ }
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+
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#if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE)
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int rpi_firmware_property(struct rpi_firmware *fw,
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u32 tag, void *data, size_t len);
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int rpi_firmware_property_list(struct rpi_firmware *fw,
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void *data, size_t tag_size);
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void rpi_firmware_put(struct rpi_firmware *fw);
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+unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw,
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+ unsigned int id);
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struct device_node *rpi_firmware_find_node(void);
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struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);
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struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
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@@ -206,6 +226,12 @@ static inline int rpi_firmware_property_
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static inline void rpi_firmware_put(struct rpi_firmware *fw) { }
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+static inline unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw,
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+ unsigned int id)
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+{
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+ return UINT_MAX;
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+}
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+
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static inline struct device_node *rpi_firmware_find_node(void)
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{
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return NULL;
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