openwrt/target/linux/bcm27xx/patches-5.4/950-0781-clk-bcm-rpi-Remove-the-quirks-for-the-CPU-clock.patch

From 30ae66617ee6f340343c8e75c244e370721ed2eb Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Tue, 26 May 2020 15:27:35 +0200
Subject: [PATCH] clk: bcm: rpi: Remove the quirks for the CPU clock

The CPU clock has had so far a bunch of quirks to expose the clock tree
properly, but since we reverted to exposing them through the MMIO driver,
we can remove that code from the firmware driver.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/clk/bcm/clk-raspberrypi.c | 163 ++----------------------------
 1 file changed, 9 insertions(+), 154 deletions(-)

--- a/drivers/clk/bcm/clk-raspberrypi.c
+++ b/drivers/clk/bcm/clk-raspberrypi.c
@@ -151,13 +151,6 @@ static unsigned long raspberrypi_fw_get_
 	return val;
 }
 
-static unsigned long raspberrypi_fw_pll_get_rate(struct clk_hw *hw,
-						 unsigned long parent_rate)
-{
-	return raspberrypi_fw_get_rate(hw, parent_rate) *
-		RPI_FIRMWARE_PLLB_ARM_DIV_RATE;
-}
-
 static int raspberrypi_fw_set_rate(struct clk_hw *hw, unsigned long rate,
 				   unsigned long parent_rate)
 {
@@ -176,140 +169,6 @@ static int raspberrypi_fw_set_rate(struc
 	return ret;
 }
 
-static int raspberrypi_fw_pll_set_rate(struct clk_hw *hw, unsigned long rate,
-				       unsigned long parent_rate)
-{
-	u32 new_rate = rate / RPI_FIRMWARE_PLLB_ARM_DIV_RATE;
-
-	return raspberrypi_fw_set_rate(hw, new_rate, parent_rate);
-}
-
-/*
- * Sadly there is no firmware rate rounding interface. We borrowed it from
- * clk-bcm2835.
- */
-static int raspberrypi_pll_determine_rate(struct clk_hw *hw,
-					  struct clk_rate_request *req)
-{
-	u64 div, final_rate;
-	u32 ndiv, fdiv;
-
-	/* We can't use req->rate directly as it would overflow */
-	final_rate = clamp(req->rate, req->min_rate, req->max_rate);
-
-	div = (u64)final_rate << A2W_PLL_FRAC_BITS;
-	do_div(div, req->best_parent_rate);
-
-	ndiv = div >> A2W_PLL_FRAC_BITS;
-	fdiv = div & ((1 << A2W_PLL_FRAC_BITS) - 1);
-
-	final_rate = ((u64)req->best_parent_rate *
-					((ndiv << A2W_PLL_FRAC_BITS) + fdiv));
-
-	req->rate = final_rate >> A2W_PLL_FRAC_BITS;
-
-	return 0;
-}
-
-static const struct clk_ops raspberrypi_firmware_pll_clk_ops = {
-	.is_prepared = raspberrypi_fw_is_prepared,
-	.recalc_rate = raspberrypi_fw_pll_get_rate,
-	.set_rate = raspberrypi_fw_pll_set_rate,
-	.determine_rate = raspberrypi_pll_determine_rate,
-};
-
-static struct clk_hw *raspberrypi_register_pllb(struct raspberrypi_clk *rpi)
-{
-	struct raspberrypi_clk_data *data;
-	struct clk_init_data init = {};
-	u32 min_rate = 0, max_rate = 0;
-	int ret;
-
-	data = devm_kzalloc(rpi->dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return ERR_PTR(-ENOMEM);
-	data->rpi = rpi;
-	data->id = RPI_FIRMWARE_ARM_CLK_ID;
-
-	/* All of the PLLs derive from the external oscillator. */
-	init.parent_names = (const char *[]){ "osc" };
-	init.num_parents = 1;
-	init.name = "pllb";
-	init.ops = &raspberrypi_firmware_pll_clk_ops;
-	init.flags = CLK_GET_RATE_NOCACHE | CLK_IGNORE_UNUSED;
-
-	/* Get min & max rates set by the firmware */
-	ret = raspberrypi_clock_property(rpi->firmware, data,
-					 RPI_FIRMWARE_GET_MIN_CLOCK_RATE,
-					 &min_rate);
-	if (ret) {
-		dev_err(rpi->dev, "Failed to get %s min freq: %d\n",
-			init.name, ret);
-		return ERR_PTR(ret);
-	}
-
-	ret = raspberrypi_clock_property(rpi->firmware, data,
-					 RPI_FIRMWARE_GET_MAX_CLOCK_RATE,
-					 &max_rate);
-	if (ret) {
-		dev_err(rpi->dev, "Failed to get %s max freq: %d\n",
-			init.name, ret);
-		return ERR_PTR(ret);
-	}
-
-	if (!min_rate || !max_rate) {
-		dev_err(rpi->dev, "Unexpected frequency range: min %u, max %u\n",
-			min_rate, max_rate);
-		return ERR_PTR(-EINVAL);
-	}
-
-	dev_info(rpi->dev, "CPU frequency range: min %u, max %u\n",
-		 min_rate, max_rate);
-
-	data->hw.init = &init;
-
-	ret = devm_clk_hw_register(rpi->dev, &data->hw);
-	if (!ret)
-		clk_hw_set_rate_range(&data->hw,
-				      min_rate * RPI_FIRMWARE_PLLB_ARM_DIV_RATE,
-				      max_rate * RPI_FIRMWARE_PLLB_ARM_DIV_RATE);
-
-	return ret;
-}
-
-static struct clk_fixed_factor raspberrypi_clk_pllb_arm = {
-	.mult = 1,
-	.div = 2,
-	.hw.init = &(struct clk_init_data) {
-		.name		= "pllb_arm",
-		.parent_names	= (const char *[]){ "pllb" },
-		.num_parents	= 1,
-		.ops		= &clk_fixed_factor_ops,
-		.flags		= CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE,
-	},
-};
-
-static struct clk_hw *raspberrypi_register_pllb_arm(struct raspberrypi_clk *rpi)
-{
-	int ret;
-
-	ret = devm_clk_hw_register(rpi->dev, &raspberrypi_clk_pllb_arm.hw);
-	if (ret) {
-		dev_err(rpi->dev, "Failed to initialize pllb_arm\n");
-		return ERR_PTR(ret);
-	}
-
-	ret = devm_clk_hw_register_clkdev(rpi->dev,
-					  &raspberrypi_clk_pllb_arm.hw,
-					  NULL, "cpu0");
-	if (ret) {
-		dev_err(rpi->dev, "Failed to initialize clkdev\n");
-		return ERR_PTR(ret);
-	}
-
-	return &raspberrypi_clk_pllb_arm.hw;
-}
-
 static int raspberrypi_fw_dumb_determine_rate(struct clk_hw *hw,
 					      struct clk_rate_request *req)
 {
@@ -338,19 +197,6 @@ static struct clk_hw *raspberrypi_clk_re
 	u32 min_rate, max_rate;
 	int ret;
 
-	if (id == RPI_FIRMWARE_ARM_CLK_ID) {
-		struct clk_hw *hw;
-
-		hw = raspberrypi_register_pllb(rpi);
-		if (IS_ERR(hw)) {
-			dev_err(rpi->dev, "Failed to initialize pllb, %ld\n",
-				PTR_ERR(hw));
-			return hw;
-		}
-
-		return raspberrypi_register_pllb_arm(rpi);
-	}
-
 	data = devm_kzalloc(rpi->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return ERR_PTR(-ENOMEM);
@@ -389,6 +235,15 @@ static struct clk_hw *raspberrypi_clk_re
 
 	clk_hw_set_rate_range(&data->hw, min_rate, max_rate);
 
+	if (id == RPI_FIRMWARE_ARM_CLK_ID) {
+		ret = devm_clk_hw_register_clkdev(rpi->dev, &data->hw,
+						  NULL, "cpu0");
+		if (ret) {
+			dev_err(rpi->dev, "Failed to initialize clkdev\n");
+			return ERR_PTR(ret);
+		}
+	}
+
 	return &data->hw;
 }