[PATCH v2 07/13] clk: Add clock driver for sun50i-a64
Jules Maselbas
jmaselbas at zdiv.net
Wed May 24 16:43:22 PDT 2023
Clock driver is adapted from Linux.
During clock init, the pll-cpu is switched to 1.2GHz, the same is done
for the pll-periph0-2x as recommended.
Signed-off-by: Jules Maselbas <jmaselbas at zdiv.net>
---
rfc->v2:
- return of_clk_add_provider value on probe
drivers/clk/Makefile | 1 +
drivers/clk/sunxi/Makefile | 2 +
drivers/clk/sunxi/clk-sun50i-a64.c | 315 +++++++++++++++++++++++++++++
drivers/clk/sunxi/clk-sun50i-a64.h | 62 ++++++
4 files changed, 380 insertions(+)
create mode 100644 drivers/clk/sunxi/Makefile
create mode 100644 drivers/clk/sunxi/clk-sun50i-a64.c
create mode 100644 drivers/clk/sunxi/clk-sun50i-a64.h
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index c865e4c274..2d87e0c244 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_MACH_RPI_COMMON) += clk-rpi.o
obj-y += bcm/
obj-$(CONFIG_COMMON_CLK_SCMI) += clk-scmi.o
obj-$(CONFIG_COMMON_CLK_GPIO) += clk-gpio.o
+obj-$(CONFIG_ARCH_SUNXI) += sunxi/
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
new file mode 100644
index 0000000000..4d1dcbebb0
--- /dev/null
+++ b/drivers/clk/sunxi/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ARCH_SUN50I_A64) += clk-sun50i-a64.o
diff --git a/drivers/clk/sunxi/clk-sun50i-a64.c b/drivers/clk/sunxi/clk-sun50i-a64.c
new file mode 100644
index 0000000000..c7463948ea
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun50i-a64.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2022 Jules Maselbas
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <linux/clk.h>
+#include <io.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+
+#define MHZ (1000 * 1000UL)
+
+#include "clk-sun50i-a64.h"
+
+#define CCU_PLL_CPUX 0x00
+#define CCU_PLL_PERIPH0 0x28
+#define CCU_CPUX_AXI_CFG 0x50
+#define CCU_AHB1_APB1_CFG 0x54
+#define CCU_APB2_CFG 0x58
+#define CCU_AHB2_CFG 0x5c
+#define CCU_BUS_CLK_GATE0 0x60
+#define CCU_BUS_CLK_GATE1 0x64
+#define CCU_BUS_CLK_GATE2 0x68
+#define CCU_BUS_CLK_GATE3 0x6c
+#define CCU_CE_CLK 0x9c
+#define CCU_MBUS_CLK 0x15c
+#define CCU_BUS_SOFT_RST0 0x2c0
+#define CCU_BUS_SOFT_RST4 0x2d8
+#define CCU_PLL_LOCK_CTRL 0x320
+
+static struct clk *clks[CLK_NUMBER];
+static struct clk_onecell_data clk_data = {
+ .clks = clks,
+ .clk_num = ARRAY_SIZE(clks),
+};
+
+static inline struct clk *
+sunxi_clk_gate(const char *name, const char *parent, void __iomem *reg, u8 shift)
+{
+ return clk_gate(name, parent, reg, shift, 0, 0);
+}
+
+static inline struct clk *
+sunxi_clk_mux(const char *name, const char * const *parents, u8 num_parents,
+ void __iomem *reg, u8 shift, u8 width)
+{
+ return clk_mux(name, 0, reg, shift, width, parents, num_parents, 0);
+}
+
+static inline struct clk *
+sunxi_clk_div(const char *name, const char *parent, struct clk_div_table *table,
+ void __iomem *reg, u8 shift, u8 width)
+{
+ return clk_divider_table(name, parent, CLK_SET_RATE_PARENT, reg, shift,
+ width, table, 0);
+}
+
+static struct clk_div_table div_apb1[] = {
+ { .val = 0, .div = 2 },
+ { .val = 1, .div = 2 },
+ { .val = 2, .div = 4 },
+ { .val = 3, .div = 8 },
+ { /* Sentinel */ },
+};
+
+static struct clk_div_table div_N[] = {
+ { .val = 0, .div = 1 },
+ { .val = 1, .div = 2 },
+ { .val = 2, .div = 4 },
+ { .val = 3, .div = 8 },
+ { /* Sentinel */ },
+};
+
+static const char *sel_cpux[] = {
+ "osc32k",
+ "osc24M",
+ "pll-cpux",
+};
+
+static const char *sel_ahb1[] = {
+ "osc32k",
+ "osc24M",
+ "axi",
+ "pll-periph0",
+};
+
+static const char *sel_apb2[] = {
+ "osc32k",
+ "osc24M",
+ "pll-periph0-2x",
+ "pll-periph0-2x",
+};
+
+static const char *sel_ahb2[] = {
+ "ahb1",
+ "pll-periph0",
+};
+
+static const char *sel_mmc[] = {
+ "osc24M",
+ "pll-periph0-2x",
+ "pll-periph1-2x",
+};
+
+static void sun50i_a64_resets_init(void __iomem *regs)
+{
+ u32 rst;
+
+ rst = 0 |
+ /* RST_USB_PHY0 */ BIT(0) |
+ /* RST_USB_PHY1 */ BIT(1) |
+ /* RST_USB_HSIC */ BIT(2);
+ writel(rst, regs + 0x0cc);
+
+ rst = 0 |
+ /* RST_BUS_MIPI_DSI */ BIT(1) |
+ /* RST_BUS_CE */ BIT(5) |
+ /* RST_BUS_DMA */ BIT(6) |
+ /* RST_BUS_MMC0 */ BIT(8) |
+ /* RST_BUS_MMC1 */ BIT(9) |
+ /* RST_BUS_MMC2 */ BIT(10) |
+ /* RST_BUS_NAND */ BIT(13) |
+ /* RST_BUS_DRAM */ BIT(14) |
+ /* RST_BUS_EMAC */ BIT(17) |
+ /* RST_BUS_TS */ BIT(18) |
+ /* RST_BUS_HSTIMER */ BIT(19) |
+ /* RST_BUS_SPI0 */ BIT(20) |
+ /* RST_BUS_SPI1 */ BIT(21) |
+ /* RST_BUS_OTG */ BIT(23) |
+ /* RST_BUS_EHCI0 */ BIT(24) |
+ /* RST_BUS_EHCI1 */ BIT(25) |
+ /* RST_BUS_OHCI0 */ BIT(28) |
+ /* RST_BUS_OHCI1 */ BIT(29);
+ writel(rst, regs + 0x2c0);
+
+ rst = 0 |
+ /* RST_BUS_VE */ BIT(0) |
+ /* RST_BUS_TCON0 */ BIT(3) |
+ /* RST_BUS_TCON1 */ BIT(4) |
+ /* RST_BUS_DEINTERLACE */ BIT(5) |
+ /* RST_BUS_CSI */ BIT(8) |
+ /* RST_BUS_HDMI0 */ BIT(10) |
+ /* RST_BUS_HDMI1 */ BIT(11) |
+ /* RST_BUS_DE */ BIT(12) |
+ /* RST_BUS_GPU */ BIT(20) |
+ /* RST_BUS_MSGBOX */ BIT(21) |
+ /* RST_BUS_SPINLOCK */ BIT(22) |
+ /* RST_BUS_DBG */ BIT(31);
+ writel(rst, regs + 0x2c4);
+
+ rst = /* RST_BUS_LVDS */ BIT(0);
+ writel(rst, regs + 0x2c8);
+
+ rst = 0 |
+ /* RST_BUS_CODEC */ BIT(0) |
+ /* RST_BUS_SPDIF */ BIT(1) |
+ /* RST_BUS_THS */ BIT(8) |
+ /* RST_BUS_I2S0 */ BIT(12) |
+ /* RST_BUS_I2S1 */ BIT(13) |
+ /* RST_BUS_I2S2 */ BIT(14);
+ writel(rst, regs + 0x2d0);
+
+ rst = 0 |
+ /* RST_BUS_I2C0 */ BIT(0) |
+ /* RST_BUS_I2C1 */ BIT(1) |
+ /* RST_BUS_I2C2 */ BIT(2) |
+ /* RST_BUS_SCR */ BIT(5) |
+ /* RST_BUS_UART0 */ BIT(16) |
+ /* RST_BUS_UART1 */ BIT(17) |
+ /* RST_BUS_UART2 */ BIT(18) |
+ /* RST_BUS_UART3 */ BIT(19) |
+ /* RST_BUS_UART4 */ BIT(20);
+ writel(rst, regs + 0x2d8);
+}
+
+static int
+sunxi_clk_set_pll(void __iomem *reg, u32 src, u32 freq)
+{
+ /* NOTE: using u32, max freq is 4GHz
+ * out freq: src * N * K
+ * factor N: [1->32]
+ * factor K: [1->4]
+ * from the manual: give priority to the choice of K >= 2
+ */
+ u32 mul = freq / src; /* target multiplier (N * K) */
+ u32 k, n;
+ u32 cfg = BIT(31); /* ENABLE */
+
+ for (k = 4; k > 1; k--) {
+ if ((mul % k) == 0)
+ break;
+ }
+ n = mul / k;
+
+ cfg |= (k - 1) << 4;
+ cfg |= (n - 1) << 8;
+
+ writel(cfg, reg);
+ return wait_on_timeout(1 * MSECOND, readl(reg) & BIT(28));
+}
+
+static void sun50i_a64_clocks_init(struct device_node *np, void __iomem *regs)
+{
+ sun50i_a64_resets_init(regs);
+
+ /* set pll-cpu to 1.2GHz */
+ if (sunxi_clk_set_pll(regs + CCU_PLL_CPUX, 24 * MHZ, 1200 * MHZ))
+ pr_err("fail to lock pll-cpu @ 1.2GHz\n");
+ clks[CLK_PLL_CPUX] = clk_fixed("pll-cpux", 1200 * MHZ);
+
+ /* switch cpu clock source: cpux_src: 1=24mhz 2=PLL_CPUX */
+ clks[CLK_CPUX] = sunxi_clk_mux("cpux", sel_cpux, ARRAY_SIZE(sel_cpux), regs + CCU_CPUX_AXI_CFG, 16, 2);
+ writel(0x20001, regs + CCU_CPUX_AXI_CFG); /* select pll-cpu */
+ udelay(1); /* wait 8 cycles */
+
+ /* set pll-periph0-2x to 1.2GHz, as recommended */
+ if (sunxi_clk_set_pll(regs + CCU_PLL_PERIPH0, 24 * MHZ, 2 * 600 * MHZ))
+ pr_err("fail to lock pll-periph @ 1.2GHz\n");
+
+ clks[CLK_PLL_PERIPH0] = clk_fixed("pll-periph0", 600 * MHZ);
+ clks[CLK_PLL_PERIPH0_2X] = clk_fixed_factor("pll-periph0-2x", "pll-periph0", 2, 1, 0);
+
+ clks[CLK_AHB1] = sunxi_clk_mux("ahb1", sel_ahb1, ARRAY_SIZE(sel_ahb1), regs + 0x054, 12, 2);
+ clks[CLK_AHB2] = sunxi_clk_mux("ahb2", sel_ahb2, ARRAY_SIZE(sel_ahb2), regs + 0x05c, 0, 1);
+
+ clks[CLK_APB1] = sunxi_clk_div("apb1", "ahb1", div_apb1, regs + 0x054, 8, 2);
+ clks[CLK_APB2] = sunxi_clk_mux("apb2", sel_apb2, ARRAY_SIZE(sel_apb2), regs + 0x058, 24, 2);
+
+ clks[CLK_BUS_MIPI_DSI] = sunxi_clk_gate("bus-mipi-dsi","ahb1",regs + 0x060, 1);
+ clks[CLK_BUS_CE] = sunxi_clk_gate("bus-ce", "ahb1", regs + 0x060, 5);
+ clks[CLK_BUS_DMA] = sunxi_clk_gate("bus-dma", "ahb1", regs + 0x060, 6);
+ clks[CLK_BUS_MMC0] = sunxi_clk_gate("bus-mmc0", "ahb1", regs + 0x060, 8);
+ clks[CLK_BUS_MMC1] = sunxi_clk_gate("bus-mmc1", "ahb1", regs + 0x060, 9);
+ clks[CLK_BUS_MMC2] = sunxi_clk_gate("bus-mmc2", "ahb1", regs + 0x060, 10);
+ clks[CLK_BUS_NAND] = sunxi_clk_gate("bus-nand", "ahb1", regs + 0x060, 13);
+ clks[CLK_BUS_DRAM] = sunxi_clk_gate("bus-dram", "ahb1", regs + 0x060, 14);
+ clks[CLK_BUS_EMAC] = sunxi_clk_gate("bus-emac", "ahb2", regs + 0x060, 17);
+ clks[CLK_BUS_TS] = sunxi_clk_gate("bus-ts", "ahb1", regs + 0x060, 18);
+ clks[CLK_BUS_HSTIMER] = sunxi_clk_gate("bus-hstimer", "ahb1", regs + 0x060, 19);
+ clks[CLK_BUS_SPI0] = sunxi_clk_gate("bus-spi0", "ahb1", regs + 0x060, 20);
+ clks[CLK_BUS_SPI1] = sunxi_clk_gate("bus-spi1", "ahb1", regs + 0x060, 21);
+ clks[CLK_BUS_OTG] = sunxi_clk_gate("bus-otg", "ahb1", regs + 0x060, 23);
+ clks[CLK_BUS_EHCI0] = sunxi_clk_gate("bus-ehci0", "ahb1", regs + 0x060, 24);
+ clks[CLK_BUS_EHCI1] = sunxi_clk_gate("bus-ehci1", "ahb2", regs + 0x060, 25);
+ clks[CLK_BUS_OHCI0] = sunxi_clk_gate("bus-ohci0", "ahb1", regs + 0x060, 28);
+ clks[CLK_BUS_OHCI1] = sunxi_clk_gate("bus-ohci1", "ahb2", regs + 0x060, 29);
+
+ clks[CLK_BUS_CODEC] = sunxi_clk_gate("bus-codec", "apb1", regs + 0x068, 0);
+ clks[CLK_BUS_SPDIF] = sunxi_clk_gate("bus-spdif", "apb1", regs + 0x068, 1);
+ clks[CLK_BUS_PIO] = sunxi_clk_gate("bus-pio", "apb1", regs + 0x068, 5);
+ clks[CLK_BUS_THS] = sunxi_clk_gate("bus-ths", "apb1", regs + 0x068, 8);
+ clks[CLK_BUS_I2S0] = sunxi_clk_gate("bus-i2s0", "apb1", regs + 0x068, 12);
+ clks[CLK_BUS_I2S1] = sunxi_clk_gate("bus-i2s1", "apb1", regs + 0x068, 13);
+ clks[CLK_BUS_I2S2] = sunxi_clk_gate("bus-i2s2", "apb1", regs + 0x068, 14);
+
+ clks[CLK_BUS_UART0] = sunxi_clk_gate("bus-uart0", "apb2", regs + 0x06c, 16);
+ clks[CLK_BUS_UART1] = sunxi_clk_gate("bus-uart1", "apb2", regs + 0x06c, 17);
+ clks[CLK_BUS_UART2] = sunxi_clk_gate("bus-uart2", "apb2", regs + 0x06c, 18);
+ clks[CLK_BUS_UART3] = sunxi_clk_gate("bus-uart3", "apb2", regs + 0x06c, 19);
+ clks[CLK_BUS_UART4] = sunxi_clk_gate("bus-uart4", "apb2", regs + 0x06c, 20);
+
+ clks[CLK_MMC0] = clk_register_composite(
+ "mmc0", sel_mmc, ARRAY_SIZE(sel_mmc),
+ sunxi_clk_mux("mmc0-mux", sel_mmc, ARRAY_SIZE(sel_mmc), regs + 0x088, 24, 2),
+ sunxi_clk_div("mmc0-div-n", "mmc0-gate", div_N, regs + 0x088, 16, 2),
+ sunxi_clk_gate("mmc0-gate", "mmc0-mux", regs + 0x088, 31),
+ 0);
+
+ clks[CLK_MMC1] = clk_register_composite(
+ "mmc1", sel_mmc, ARRAY_SIZE(sel_mmc),
+ sunxi_clk_mux("mmc1-mux", sel_mmc, ARRAY_SIZE(sel_mmc), regs + 0x08c, 24, 2),
+ sunxi_clk_div("mmc1-div-n", "mmc1-gate", div_N, regs + 0x08c, 16, 2),
+ sunxi_clk_gate("mmc1-gate", "mmc1-mux", regs + 0x08c, 31),
+ 0);
+
+ clks[CLK_MMC2] = clk_register_composite(
+ "mmc2", sel_mmc, ARRAY_SIZE(sel_mmc),
+ sunxi_clk_mux("mmc2-mux", sel_mmc, ARRAY_SIZE(sel_mmc), regs + 0x090, 24, 2),
+ sunxi_clk_div("mmc2-div-n", "mmc2-gate", div_N, regs + 0x090, 16, 2),
+ sunxi_clk_gate("mmc2-gate", "mmc2-mux", regs + 0x090, 31),
+ 0);
+
+ /* generic set_rate doesn't support switching parent,
+ * let's do it here for now */
+ clk_set_parent(clks[CLK_MMC0], clks[CLK_PLL_PERIPH0_2X]);
+ clk_set_parent(clks[CLK_MMC2], clks[CLK_PLL_PERIPH0_2X]);
+}
+
+static int sun50i_a64_ccu_probe(struct device *dev)
+{
+ struct resource *iores;
+
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores))
+ return PTR_ERR(iores);
+
+ sun50i_a64_clocks_init(dev->of_node, IOMEM(iores->start));
+ return of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, &clk_data);
+}
+
+static __maybe_unused struct of_device_id sun50i_a64_ccu_dt_ids[] = {
+ {
+ .compatible = "allwinner,sun50i-a64-ccu",
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct driver sun50i_a64_ccu_driver = {
+ .probe = sun50i_a64_ccu_probe,
+ .name = "sun50i-a64-ccu",
+ .of_compatible = DRV_OF_COMPAT(sun50i_a64_ccu_dt_ids),
+};
+postcore_platform_driver(sun50i_a64_ccu_driver);
diff --git a/drivers/clk/sunxi/clk-sun50i-a64.h b/drivers/clk/sunxi/clk-sun50i-a64.h
new file mode 100644
index 0000000000..a4ddc39eb8
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun50i-a64.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright 2016 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard at free-electrons.com>
+ */
+
+#include <dt-bindings/clock/sun50i-a64-ccu.h>
+
+#ifndef _CLK_SUN50I_A64_H_
+#define _CLK_SUN50I_A64_H_
+
+#include <dt-bindings/clock/sun50i-a64-ccu.h>
+#include <dt-bindings/reset/sun50i-a64-ccu.h>
+
+#define CLK_OSC_12M 0
+#define CLK_PLL_CPUX 1
+#define CLK_PLL_AUDIO_BASE 2
+#define CLK_PLL_AUDIO 3
+#define CLK_PLL_AUDIO_2X 4
+#define CLK_PLL_AUDIO_4X 5
+#define CLK_PLL_AUDIO_8X 6
+
+/* PLL_VIDEO0 exported for HDMI PHY */
+
+#define CLK_PLL_VIDEO0_2X 8
+#define CLK_PLL_VE 9
+#define CLK_PLL_DDR0 10
+
+/* PLL_PERIPH0 exported for PRCM */
+
+#define CLK_PLL_PERIPH0_2X 12
+#define CLK_PLL_PERIPH1 13
+#define CLK_PLL_PERIPH1_2X 14
+#define CLK_PLL_VIDEO1 15
+#define CLK_PLL_GPU 16
+#define CLK_PLL_MIPI 17
+#define CLK_PLL_HSIC 18
+#define CLK_PLL_DE 19
+#define CLK_PLL_DDR1 20
+#define CLK_AXI 22
+#define CLK_APB 23
+#define CLK_AHB1 24
+#define CLK_APB1 25
+#define CLK_APB2 26
+#define CLK_AHB2 27
+
+/* All the bus gates are exported */
+
+/* The first bunch of module clocks are exported */
+
+#define CLK_USB_OHCI0_12M 90
+
+#define CLK_USB_OHCI1_12M 92
+
+/* All the DRAM gates are exported */
+
+/* And the DSI and GPU module clock is exported */
+
+#define CLK_NUMBER (CLK_GPU + 1)
+
+#endif /* _CLK_SUN50I_A64_H_ */
--
2.40.1
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