[U-Boot] [RFC PATCH 10/11] arm: Add support for Qualcomm Snapdragon family

Mateusz Kulikowski mateusz.kulikowski at gmail.com
Thu Dec 10 22:41:46 CET 2015


First supported chip is APQ8016 (that is compatible with MSM8916).
Drivers in SoC code:
- Reset controller (PSHOLD)
- Clock controller (very simple clock configuration for MMC and UART)

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
---

 arch/arm/Kconfig                                   |  12 +
 arch/arm/Makefile                                  |   1 +
 arch/arm/mach-snapdragon/Kconfig                   |   6 +
 arch/arm/mach-snapdragon/Makefile                  |   8 +
 arch/arm/mach-snapdragon/clock-apq8016.c           | 262 +++++++++++++++++++++
 arch/arm/mach-snapdragon/include/mach/gpio.h       |  25 ++
 .../mach-snapdragon/include/mach/sysmap-apq8016.h  |  15 ++
 arch/arm/mach-snapdragon/reset.c                   |  40 ++++
 8 files changed, 369 insertions(+)
 create mode 100644 arch/arm/mach-snapdragon/Kconfig
 create mode 100644 arch/arm/mach-snapdragon/Makefile
 create mode 100644 arch/arm/mach-snapdragon/clock-apq8016.c
 create mode 100644 arch/arm/mach-snapdragon/include/mach/gpio.h
 create mode 100644 arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
 create mode 100644 arch/arm/mach-snapdragon/reset.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fb9176b..0241980 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -493,6 +493,16 @@ config OMAP54XX
 	select CPU_V7
 	select SUPPORT_SPL
 
+config ARCH_SNAPDRAGON
+	bool "Qualcomm Snapdragon SoCs"
+	select ARM64
+	select DM
+	select DM_GPIO
+	select DM_SERIAL
+	select DM_SPMI
+	select OF_CONTROL
+	select OF_SEPARATE
+
 config RMOBILE
 	bool "Renesas ARM SoCs"
 	select CPU_V7
@@ -745,6 +755,8 @@ source "arch/arm/mach-rockchip/Kconfig"
 
 source "arch/arm/mach-s5pc1xx/Kconfig"
 
+source "arch/arm/mach-snapdragon/Kconfig"
+
 source "arch/arm/mach-socfpga/Kconfig"
 
 source "arch/arm/mach-tegra/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 18283d1..b977309 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -54,6 +54,7 @@ machine-$(CONFIG_ARMADA_XP)		+= mvebu
 # TODO: rename CONFIG_ORION5X -> CONFIG_ARCH_ORION5X
 machine-$(CONFIG_ORION5X)		+= orion5x
 machine-$(CONFIG_ARCH_S5PC1XX)		+= s5pc1xx
+machine-$(CONFIG_ARCH_SNAPDRAGON)	+= snapdragon
 machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip
 machine-$(CONFIG_TEGRA)			+= tegra
diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
new file mode 100644
index 0000000..156e733
--- /dev/null
+++ b/arch/arm/mach-snapdragon/Kconfig
@@ -0,0 +1,6 @@
+if ARCH_SNAPDRAGON
+
+config SYS_SOC
+	default "snapdragon"
+
+endif
diff --git a/arch/arm/mach-snapdragon/Makefile b/arch/arm/mach-snapdragon/Makefile
new file mode 100644
index 0000000..8e84705
--- /dev/null
+++ b/arch/arm/mach-snapdragon/Makefile
@@ -0,0 +1,8 @@
+#
+# (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += clock-apq8016.o
+obj-y += reset.o
diff --git a/arch/arm/mach-snapdragon/clock-apq8016.c b/arch/arm/mach-snapdragon/clock-apq8016.c
new file mode 100644
index 0000000..c8c15b4
--- /dev/null
+++ b/arch/arm/mach-snapdragon/clock-apq8016.c
@@ -0,0 +1,262 @@
+/*
+ * Clock drivers for Qualcomm APQ8016
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+ *
+ * Based on Little Kernel driver, simplified
+ *
+ * SPDX-License-Identifier:	BSD-3-Clause
+ */
+
+#include <asm/io.h>
+#include <dm.h>
+#include <clk.h>
+#include <common.h>
+#include <errno.h>
+#include <linux/bitops.h>
+
+/* GPLL0 clock control registers */
+#define GPLL0_STATUS        0x2101C
+#define GPLL0_STATUS_ACTIVE BIT(17)
+
+#define APCS_GPLL_ENA_VOTE  0x45000
+#define APCS_GPLL_ENA_VOTE_GPLL0 BIT(0)
+
+/* vote reg for blsp1 clock */
+#define APCS_CLOCK_BRANCH_ENA_VOTE  0x45004
+#define APCS_CLOCK_BRANCH_ENA_VOTE_BLSP1 BIT(10)
+
+/* SDC(n) clock control registers; n=1,2 */
+
+/* block reset*/
+#define SDCC_BCR(n)                 (((n*0x1000)) + 0x41000)
+/* cmd */
+#define SDCC_CMD_RCGR(n)            (((n*0x1000)) + 0x41004)
+/* cfg */
+#define SDCC_CFG_RCGR(n)            (((n*0x1000)) + 0x41008)
+/* m */
+#define SDCC_M(n)                   (((n*0x1000)) + 0x4100C)
+/* n */
+#define SDCC_N(n)                   (((n*0x1000)) + 0x41010)
+/* d */
+#define SDCC_D(n)                   (((n*0x1000)) + 0x41014)
+/* branch control */
+#define SDCC_APPS_CBCR(n)           (((n*0x1000)) + 0x41018)
+#define SDCC_AHB_CBCR(n)            (((n*0x1000)) + 0x4101C)
+
+/* BLSP1 AHB clock (root clock for BLSP) */
+#define BLSP1_AHB_CBCR              0x1008
+
+/* Uart clock control registers */
+#define BLSP1_UART2_BCR             0x3028
+#define BLSP1_UART2_APPS_CBCR       0x302C
+#define BLSP1_UART2_APPS_CMD_RCGR   0x3034
+#define BLSP1_UART2_APPS_CFG_RCGR   0x3038
+#define BLSP1_UART2_APPS_M          0x303C
+#define BLSP1_UART2_APPS_N          0x3040
+#define BLSP1_UART2_APPS_D          0x3044
+
+/* CBCR register fields */
+#define CBCR_BRANCH_ENABLE_BIT  BIT(0)
+#define CBCR_BRANCH_OFF_BIT     BIT(31)
+
+struct msm_clk_priv {
+	void *base;
+};
+
+/* Enable clock controlled by CBC soft macro */
+static void clk_enable_cbc(void *cbcr)
+{
+	uint32_t val = readl(cbcr);
+	val |= CBCR_BRANCH_ENABLE_BIT;
+	writel(val, cbcr);
+
+	while (readl(cbcr) & CBCR_BRANCH_OFF_BIT)
+		;
+}
+
+/* clock has 800MHz */
+static void clk_enable_gpll0(void *base)
+{
+	uint32_t ena;
+
+	if (readl(base + GPLL0_STATUS) & GPLL0_STATUS_ACTIVE)
+		return; /* clock already enabled */
+
+	ena = readl(base + APCS_GPLL_ENA_VOTE);
+	ena |= APCS_GPLL_ENA_VOTE_GPLL0;
+	writel(ena, base + APCS_GPLL_ENA_VOTE);
+
+	while ((readl(base + GPLL0_STATUS) & GPLL0_STATUS_ACTIVE) == 0)
+		;
+}
+
+#define APPS_CMD_RGCR_UPDATE BIT(0)
+
+/* Update clock command via CMD_RGCR */
+static void clk_bcr_update(void *apps_cmd_rgcr)
+{
+	uint32_t cmd;
+
+	cmd  = readl(apps_cmd_rgcr);
+	cmd |= APPS_CMD_RGCR_UPDATE;
+	writel(cmd, apps_cmd_rgcr);
+
+	/* Wait for frequency to be updated. */
+	while (readl(apps_cmd_rgcr) & APPS_CMD_RGCR_UPDATE)
+		;
+}
+
+struct bcr_regs {
+	uintptr_t cfg_rcgr;
+	uintptr_t cmd_rcgr;
+	uintptr_t M;
+	uintptr_t N;
+	uintptr_t D;
+};
+
+/* RCGR_CFG register fields */
+#define CFG_MODE_DUAL_EDGE (0x2 << 12) /* Counter mode */
+
+/* sources */
+#define CFG_CLK_SRC_CXO   (0 << 8)
+#define CFG_CLK_SRC_GPLL0 (1 << 8)
+#define CFG_CLK_SRC_MASK  (7 << 8)
+
+/* Mask for supported fields */
+#define CFG_MASK 0x3FFF
+
+#define BM(msb, lsb)     (((((uint32_t)-1) << (31-msb)) >> (31-msb+lsb)) << lsb)
+#define BVAL(msb, lsb, val) (((val) << lsb) & BM(msb, lsb))
+
+/* root set rate for clocks with half integer and MND divider */
+static void clk_rcg_set_rate_mnd(void *base, const struct bcr_regs *regs,
+				 int div, int m, int n, int source)
+{
+	uint32_t cfg;
+	/* This register houses the M value for MND divider. */
+	uint32_t m_val = m;
+	/* This register houses the NOT(N-M) value for MND divider. */
+	uint32_t n_val = ~((n)-(m)) * !!(n);
+	/* This register houses the NOT 2D value for MND divider. */
+	uint32_t d_val = ~(n);
+
+	/* Program MND values */
+	writel(m_val, base + regs->M); /* M */
+	writel(n_val, base + regs->N); /* N */
+	writel(d_val, base + regs->D); /* D */
+
+	/* setup src select and divider */
+	cfg  = readl(base + regs->cfg_rcgr);
+	cfg &= ~CFG_MASK;
+	cfg |= source & CFG_CLK_SRC_MASK; /* Select clock source */
+	cfg |= BVAL(4, 0, (int)(2*(div) - 1))  | BVAL(10, 8, source);
+	if (n_val)
+		cfg |= CFG_MODE_DUAL_EDGE;
+
+	writel(cfg, base + regs->cfg_rcgr); /* Write new clock configuration */
+
+	/* Inform h/w to start using the new config. */
+	clk_bcr_update(base + regs->cmd_rcgr);
+}
+
+static const struct bcr_regs sdc_regs[] = {
+	{
+	.cfg_rcgr = SDCC_CFG_RCGR(1),
+	.cmd_rcgr = SDCC_CMD_RCGR(1),
+	.M = SDCC_M(1),
+	.N = SDCC_N(1),
+	.D = SDCC_D(1),
+	},
+	{
+	.cfg_rcgr = SDCC_CFG_RCGR(2),
+	.cmd_rcgr = SDCC_CMD_RCGR(2),
+	.M = SDCC_M(2),
+	.N = SDCC_N(2),
+	.D = SDCC_D(2),
+	}
+};
+
+/* Init clock for SDHCI controller */
+static int clk_init_sdc(struct msm_clk_priv *p, int slot, uint rate)
+{
+	int div = 8; /* 100MHz default */
+
+	if (rate == 200000000)
+		div = 4;
+
+	clk_enable_cbc(p->base + SDCC_AHB_CBCR(slot));
+	/* 800Mhz/div, gpll0 */
+	clk_rcg_set_rate_mnd(p->base, &sdc_regs[slot], div, 0, 0,
+			     CFG_CLK_SRC_GPLL0);
+	clk_enable_gpll0(p->base);
+	clk_enable_cbc(p->base + SDCC_APPS_CBCR(slot));
+	return rate;
+}
+
+static const struct bcr_regs uart2_regs = {
+	.cfg_rcgr = BLSP1_UART2_APPS_CFG_RCGR,
+	.cmd_rcgr = BLSP1_UART2_APPS_CMD_RCGR,
+	.M = BLSP1_UART2_APPS_M,
+	.N = BLSP1_UART2_APPS_N,
+	.D = BLSP1_UART2_APPS_D,
+};
+
+/* Init UART clock, 115200 */
+static int clk_init_uart(struct msm_clk_priv *p)
+{
+	/* Enable iface clk */
+	clk_enable_cbc(p->base + BLSP1_AHB_CBCR);
+	/* 7372800 uart block clock @ GPLL0 */
+	clk_rcg_set_rate_mnd(p->base, &uart2_regs, 1, 144, 15625,
+			     CFG_CLK_SRC_GPLL0);
+	clk_enable_gpll0(p->base);
+	/* Enable core clk */
+	clk_enable_cbc(p->base + BLSP1_UART2_APPS_CBCR);
+	return 0;
+}
+
+ulong msm_set_periph_rate(struct udevice *dev, int periph, ulong rate)
+{
+	struct msm_clk_priv *priv = dev_get_priv(dev);
+
+	switch (periph) {
+	case 0: /* SDC1 */
+		return clk_init_sdc(priv, 0, rate);
+		break;
+	case 1: /* SDC2 */
+		return clk_init_sdc(priv, 1, rate);
+		break;
+	case 4: /* UART2 */
+		return clk_init_uart(priv);
+		break;
+	default:
+		return 0;
+	}
+	return 0;
+}
+
+static int msm_clk_probe(struct udevice *dev)
+{
+	struct msm_clk_priv *priv = dev_get_priv(dev);
+	priv->base = (void *)dev_get_addr(dev);
+	return 0;
+}
+
+static struct clk_ops msm_clk_ops = {
+	.set_periph_rate = msm_set_periph_rate,
+};
+
+static const struct udevice_id msm_clk_ids[] = {
+	{ .compatible = "qcom,gcc-msm8916" },
+	{ }
+};
+
+U_BOOT_DRIVER(clk_msm) = {
+	.name		= "clk_msm",
+	.id		= UCLASS_CLK,
+	.of_match	= msm_clk_ids,
+	.ops		= &msm_clk_ops,
+	.priv_auto_alloc_size = sizeof(struct msm_clk_priv),
+	.probe		= msm_clk_probe,
+};
diff --git a/arch/arm/mach-snapdragon/include/mach/gpio.h b/arch/arm/mach-snapdragon/include/mach/gpio.h
new file mode 100644
index 0000000..e2ce28b
--- /dev/null
+++ b/arch/arm/mach-snapdragon/include/mach/gpio.h
@@ -0,0 +1,25 @@
+/*
+ * Qualcomm GPIO definitions
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _MACH_GPIO_H
+#define _MACH_GPIO_H
+
+/* Register offsets */
+#define GPIO_CONFIG_OFF(no)         ((no)*0x1000)
+#define GPIO_IN_OUT_OFF(no)         ((no)*0x1000 + 0x4)
+
+/* OE */
+#define GPIO_OE_DISABLE	(0x0 << 9)
+#define GPIO_OE_ENABLE	(0x1 << 9)
+#define GPIO_OE_MASK	(0x1 << 9)
+
+/* GPIO_IN_OUT register shifts. */
+#define GPIO_IN         0
+#define GPIO_OUT        1
+
+#endif /* _ASM_ARCH_GPIO_H */
+
diff --git a/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
new file mode 100644
index 0000000..32bc761
--- /dev/null
+++ b/arch/arm/mach-snapdragon/include/mach/sysmap-apq8016.h
@@ -0,0 +1,15 @@
+/*
+ * Qualcomm APQ8916 sysmap
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _MACH_APQ8016_SYSMAP_H
+#define _MACH_APQ8016_SYSMAP_H
+
+#define GICD_BASE 0x0b000000
+#define GICC_BASE 0x0a20c000
+
+#endif
+
diff --git a/arch/arm/mach-snapdragon/reset.c b/arch/arm/mach-snapdragon/reset.c
new file mode 100644
index 0000000..ade3237
--- /dev/null
+++ b/arch/arm/mach-snapdragon/reset.c
@@ -0,0 +1,40 @@
+/*
+ * Qualcomm APQ8016 reset controller driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int msm_reset_request(struct udevice *dev, enum reset_t type)
+{
+	phys_addr_t addr = dev_get_addr(dev);
+	if (!addr)
+		return -EINVAL;
+	writel(0, addr);
+	return -EINPROGRESS;
+}
+
+static struct reset_ops msm_reset_ops = {
+	.request	= msm_reset_request,
+};
+
+static const struct udevice_id msm_reset_ids[] = {
+	{ .compatible = "qcom,pshold" },
+	{ }
+};
+
+U_BOOT_DRIVER(reset_sandbox) = {
+	.name		= "msm_reset",
+	.id		= UCLASS_RESET,
+	.of_match	= msm_reset_ids,
+	.ops		= &msm_reset_ops,
+};
-- 
2.5.0



More information about the U-Boot mailing list