clk: mmp: Add Marvell PXA1908 MPMU driver

Add driver for the MPMU controller block on Marvell's PXA1908 SoC. The
driver is incomplete, currently only supporting the fixed PLL1; dynamic
PLLs 2-4 and CPU/DDR/AXI clock support is missing.

Signed-off-by: Duje Mihanović <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

Author: LegoLivesMatter

drivers/clk/mmp/Makefile

@@ -11,4 +11,4 @@ obj-$(CONFIG_MACH_MMP_DT) += clk-of-pxa168.o clk-of-pxa910.o
 obj-$(CONFIG_COMMON_CLK_MMP2) += clk-of-mmp2.o clk-pll.o pwr-island.o
 obj-$(CONFIG_COMMON_CLK_MMP2_AUDIO) += clk-audio.o
 
-obj-$(CONFIG_ARCH_MMP) += clk-of-pxa1928.o clk-pxa1908-apbc.o clk-pxa1908-apbcp.o clk-pxa1908-apmu.o
+obj-$(CONFIG_ARCH_MMP) += clk-of-pxa1928.o clk-pxa1908-apbc.o clk-pxa1908-apbcp.o clk-pxa1908-apmu.o clk-pxa1908-mpmu.o

drivers/clk/mmp/clk-pxa1908-mpmu.c

@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/bits.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/units.h>
+
+#include <dt-bindings/clock/marvell,pxa1908.h>
+
+#include "clk.h"
+
+#define MPMU_UART_PLL		0x14
+
+#define MPMU_NR_CLKS		39
+
+struct pxa1908_clk_unit {
+	struct mmp_clk_unit unit;
+	void __iomem *base;
+};
+
+static struct mmp_param_fixed_rate_clk fixed_rate_clks[] = {
+	{PXA1908_CLK_CLK32, "clk32", NULL, 0, 32768},
+	{PXA1908_CLK_VCTCXO, "vctcxo", NULL, 0, 26 * HZ_PER_MHZ},
+	{PXA1908_CLK_PLL1_624, "pll1_624", NULL, 0, 624 * HZ_PER_MHZ},
+	{PXA1908_CLK_PLL1_416, "pll1_416", NULL, 0, 416 * HZ_PER_MHZ},
+	{PXA1908_CLK_PLL1_499, "pll1_499", NULL, 0, 499 * HZ_PER_MHZ},
+	{PXA1908_CLK_PLL1_832, "pll1_832", NULL, 0, 832 * HZ_PER_MHZ},
+	{PXA1908_CLK_PLL1_1248, "pll1_1248", NULL, 0, 1248 * HZ_PER_MHZ},
+};
+
+static struct mmp_param_fixed_factor_clk fixed_factor_clks[] = {
+	{PXA1908_CLK_PLL1_D2, "pll1_d2", "pll1_624", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D4, "pll1_d4", "pll1_d2", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D6, "pll1_d6", "pll1_d2", 1, 3, 0},
+	{PXA1908_CLK_PLL1_D8, "pll1_d8", "pll1_d4", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D12, "pll1_d12", "pll1_d6", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D13, "pll1_d13", "pll1_624", 1, 13, 0},
+	{PXA1908_CLK_PLL1_D16, "pll1_d16", "pll1_d8", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D24, "pll1_d24", "pll1_d12", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D48, "pll1_d48", "pll1_d24", 1, 2, 0},
+	{PXA1908_CLK_PLL1_D96, "pll1_d96", "pll1_d48", 1, 2, 0},
+	{PXA1908_CLK_PLL1_32, "pll1_32", "pll1_d13", 2, 3, 0},
+	{PXA1908_CLK_PLL1_208, "pll1_208", "pll1_d2", 2, 3, 0},
+	{PXA1908_CLK_PLL1_117, "pll1_117", "pll1_624", 3, 16, 0},
+};
+
+static struct u32_fract uart_factor_tbl[] = {
+	{.numerator = 8125, .denominator = 1536},	/* 14.745MHz */
+};
+
+static struct mmp_clk_factor_masks uart_factor_masks = {
+	.factor = 2,
+	.num_mask = GENMASK(12, 0),
+	.den_mask = GENMASK(12, 0),
+	.num_shift = 16,
+	.den_shift = 0,
+};
+
+static void pxa1908_pll_init(struct pxa1908_clk_unit *pxa_unit)
+{
+	struct mmp_clk_unit *unit = &pxa_unit->unit;
+
+	mmp_register_fixed_rate_clks(unit, fixed_rate_clks,
+					ARRAY_SIZE(fixed_rate_clks));
+
+	mmp_register_fixed_factor_clks(unit, fixed_factor_clks,
+					ARRAY_SIZE(fixed_factor_clks));
+
+	mmp_clk_register_factor("uart_pll", "pll1_d4",
+			CLK_SET_RATE_PARENT,
+			pxa_unit->base + MPMU_UART_PLL,
+			&uart_factor_masks, uart_factor_tbl,
+			ARRAY_SIZE(uart_factor_tbl), NULL);
+}
+
+static int pxa1908_mpmu_probe(struct platform_device *pdev)
+{
+	struct pxa1908_clk_unit *pxa_unit;
+
+	pxa_unit = devm_kzalloc(&pdev->dev, sizeof(*pxa_unit), GFP_KERNEL);
+	if (IS_ERR(pxa_unit))
+		return PTR_ERR(pxa_unit);
+
+	pxa_unit->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(pxa_unit->base))
+		return PTR_ERR(pxa_unit->base);
+
+	mmp_clk_init(pdev->dev.of_node, &pxa_unit->unit, MPMU_NR_CLKS);
+
+	pxa1908_pll_init(pxa_unit);
+
+	return 0;
+}
+
+static const struct of_device_id pxa1908_mpmu_match_table[] = {
+	{ .compatible = "marvell,pxa1908-mpmu" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pxa1908_mpmu_match_table);
+
+static struct platform_driver pxa1908_mpmu_driver = {
+	.probe = pxa1908_mpmu_probe,
+	.driver = {
+		.name = "pxa1908-mpmu",
+		.of_match_table = pxa1908_mpmu_match_table
+	}
+};
+module_platform_driver(pxa1908_mpmu_driver);
+
+MODULE_AUTHOR("Duje Mihanović <[email protected]>");
+MODULE_DESCRIPTION("Marvell PXA1908 MPMU Clock Driver");
+MODULE_LICENSE("GPL");