1 files changed, 408 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/am33xx/clock_am33xx.c b/arch/arm/cpu/armv7/am33xx/clock_am33xx.c
new file mode 100644
index 000000000..a1efc7520
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/clock_am33xx.c
@@ -0,0 +1,408 @@
+/*
+ * clock_am33xx.c
+ *
+ * clocks for AM33XX based boards
+ *
+ * Copyright (C) 2013, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+
+#define PRCM_MOD_EN		0x2
+#define PRCM_FORCE_WAKEUP	0x2
+#define PRCM_FUNCTL		0x0
+
+#define PRCM_EMIF_CLK_ACTIVITY	BIT(2)
+#define PRCM_L3_GCLK_ACTIVITY	BIT(4)
+
+#define PLL_BYPASS_MODE		0x4
+#define ST_MN_BYPASS		0x00000100
+#define ST_DPLL_CLK		0x00000001
+#define CLK_SEL_MASK		0x7ffff
+#define CLK_DIV_MASK		0x1f
+#define CLK_DIV2_MASK		0x7f
+#define CLK_SEL_SHIFT		0x8
+#define CLK_MODE_SEL		0x7
+#define CLK_MODE_MASK		0xfffffff8
+#define CLK_DIV_SEL		0xFFFFFFE0
+#define CPGMAC0_IDLE		0x30000
+#define DPLL_CLKDCOLDO_GATE_CTRL        0x300
+
+#define OSC	(V_OSCK/1000000)
+
+#define MPUPLL_M	CONFIG_SYS_MPUCLK
+#define MPUPLL_N	(OSC-1)
+#define MPUPLL_M2	1
+
+/* Core PLL Fdll = 1 GHZ, */
+#define COREPLL_M	1000
+#define COREPLL_N	(OSC-1)
+
+#define COREPLL_M4	10	/* CORE_CLKOUTM4 = 200 MHZ */
+#define COREPLL_M5	8	/* CORE_CLKOUTM5 = 250 MHZ */
+#define COREPLL_M6	4	/* CORE_CLKOUTM6 = 500 MHZ */
+
+/*
+ * USB PHY clock is 960 MHZ. Since, this comes directly from Fdll, Fdll
+ * frequency needs to be set to 960 MHZ. Hence,
+ * For clkout = 192 MHZ, Fdll = 960 MHZ, divider values are given below
+ */
+#define PERPLL_M	960
+#define PERPLL_N	(OSC-1)
+#define PERPLL_M2	5
+
+/* DDR Freq is 266 MHZ for now */
+/* Set Fdll = 400 MHZ , Fdll = M * 2 * CLKINP/ N + 1; clkout = Fdll /(2 * M2) */
+#define DDRPLL_M	266
+#define DDRPLL_N	(OSC-1)
+#define DDRPLL_M2	1
+
+const struct cm_perpll *cmper = (struct cm_perpll *)CM_PER;
+const struct cm_wkuppll *cmwkup = (struct cm_wkuppll *)CM_WKUP;
+const struct cm_dpll *cmdpll = (struct cm_dpll *)CM_DPLL;
+const struct cm_rtc *cmrtc = (struct cm_rtc *)CM_RTC;
+
+static void enable_interface_clocks(void)
+{
+	/* Enable all the Interconnect Modules */
+	writel(PRCM_MOD_EN, &cmper->l3clkctrl);
+	while (readl(&cmper->l3clkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmper->l4lsclkctrl);
+	while (readl(&cmper->l4lsclkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmper->l4fwclkctrl);
+	while (readl(&cmper->l4fwclkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmwkup->wkl4wkclkctrl);
+	while (readl(&cmwkup->wkl4wkclkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmper->l3instrclkctrl);
+	while (readl(&cmper->l3instrclkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmper->l4hsclkctrl);
+	while (readl(&cmper->l4hsclkctrl) != PRCM_MOD_EN)
+		;
+
+	writel(PRCM_MOD_EN, &cmwkup->wkgpio0clkctrl);
+	while (readl(&cmwkup->wkgpio0clkctrl) != PRCM_MOD_EN)
+		;
+}
+
+/*
+ * Force power domain wake up transition
+ * Ensure that the corresponding interface clock is active before
+ * using the peripheral
+ */
+static void power_domain_wkup_transition(void)
+{
+	writel(PRCM_FORCE_WAKEUP, &cmper->l3clkstctrl);
+	writel(PRCM_FORCE_WAKEUP, &cmper->l4lsclkstctrl);
+	writel(PRCM_FORCE_WAKEUP, &cmwkup->wkclkstctrl);
+	writel(PRCM_FORCE_WAKEUP, &cmper->l4fwclkstctrl);
+	writel(PRCM_FORCE_WAKEUP, &cmper->l3sclkstctrl);
+}
+
+/*
+ * Enable the peripheral clock for required peripherals
+ */
+static void enable_per_clocks(void)
+{
+	/* Enable the control module though RBL would have done it*/
+	writel(PRCM_MOD_EN, &cmwkup->wkctrlclkctrl);
+	while (readl(&cmwkup->wkctrlclkctrl) != PRCM_MOD_EN)
+		;
+
+	/* Enable the module clock */
+	writel(PRCM_MOD_EN, &cmper->timer2clkctrl);
+	while (readl(&cmper->timer2clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* Select the Master osc 24 MHZ as Timer2 clock source */
+	writel(0x1, &cmdpll->clktimer2clk);
+
+	/* UART0 */
+	writel(PRCM_MOD_EN, &cmwkup->wkup_uart0ctrl);
+	while (readl(&cmwkup->wkup_uart0ctrl) != PRCM_MOD_EN)
+		;
+
+	/* UART1 */
+#ifdef CONFIG_SERIAL2
+	writel(PRCM_MOD_EN, &cmper->uart1clkctrl);
+	while (readl(&cmper->uart1clkctrl) != PRCM_MOD_EN)
+		;
+#endif /* CONFIG_SERIAL2 */
+
+	/* UART2 */
+#ifdef CONFIG_SERIAL3
+	writel(PRCM_MOD_EN, &cmper->uart2clkctrl);
+	while (readl(&cmper->uart2clkctrl) != PRCM_MOD_EN)
+		;
+#endif /* CONFIG_SERIAL3 */
+
+	/* UART3 */
+#ifdef CONFIG_SERIAL4
+	writel(PRCM_MOD_EN, &cmper->uart3clkctrl);
+	while (readl(&cmper->uart3clkctrl) != PRCM_MOD_EN)
+		;
+#endif /* CONFIG_SERIAL4 */
+
+	/* UART4 */
+#ifdef CONFIG_SERIAL5
+	writel(PRCM_MOD_EN, &cmper->uart4clkctrl);
+	while (readl(&cmper->uart4clkctrl) != PRCM_MOD_EN)
+		;
+#endif /* CONFIG_SERIAL5 */
+
+	/* UART5 */
+#ifdef CONFIG_SERIAL6
+	writel(PRCM_MOD_EN, &cmper->uart5clkctrl);
+	while (readl(&cmper->uart5clkctrl) != PRCM_MOD_EN)
+		;
+#endif /* CONFIG_SERIAL6 */
+
+	/* GPMC */
+	writel(PRCM_MOD_EN, &cmper->gpmcclkctrl);
+	while (readl(&cmper->gpmcclkctrl) != PRCM_MOD_EN)
+		;
+
+	/* ELM */
+	writel(PRCM_MOD_EN, &cmper->elmclkctrl);
+	while (readl(&cmper->elmclkctrl) != PRCM_MOD_EN)
+		;
+
+	/* MMC0*/
+	writel(PRCM_MOD_EN, &cmper->mmc0clkctrl);
+	while (readl(&cmper->mmc0clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* MMC1 */
+	writel(PRCM_MOD_EN, &cmper->mmc1clkctrl);
+	while (readl(&cmper->mmc1clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* i2c0 */
+	writel(PRCM_MOD_EN, &cmwkup->wkup_i2c0ctrl);
+	while (readl(&cmwkup->wkup_i2c0ctrl) != PRCM_MOD_EN)
+		;
+
+	/* gpio1 module */
+	writel(PRCM_MOD_EN, &cmper->gpio1clkctrl);
+	while (readl(&cmper->gpio1clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* gpio2 module */
+	writel(PRCM_MOD_EN, &cmper->gpio2clkctrl);
+	while (readl(&cmper->gpio2clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* gpio3 module */
+	writel(PRCM_MOD_EN, &cmper->gpio3clkctrl);
+	while (readl(&cmper->gpio3clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* i2c1 */
+	writel(PRCM_MOD_EN, &cmper->i2c1clkctrl);
+	while (readl(&cmper->i2c1clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* Ethernet */
+	writel(PRCM_MOD_EN, &cmper->cpgmac0clkctrl);
+	while ((readl(&cmper->cpgmac0clkctrl) & CPGMAC0_IDLE) != PRCM_FUNCTL)
+		;
+
+	/* spi0 */
+	writel(PRCM_MOD_EN, &cmper->spi0clkctrl);
+	while (readl(&cmper->spi0clkctrl) != PRCM_MOD_EN)
+		;
+
+	/* RTC */
+	writel(PRCM_MOD_EN, &cmrtc->rtcclkctrl);
+	while (readl(&cmrtc->rtcclkctrl) != PRCM_MOD_EN)
+		;
+
+	/* MUSB */
+	writel(PRCM_MOD_EN, &cmper->usb0clkctrl);
+	while (readl(&cmper->usb0clkctrl) != PRCM_MOD_EN)
+		;
+}
+
+static void mpu_pll_config(void)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = readl(&cmwkup->clkmoddpllmpu);
+	clksel = readl(&cmwkup->clkseldpllmpu);
+	div_m2 = readl(&cmwkup->divm2dpllmpu);
+
+	/* Set the PLL to bypass Mode */
+	writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllmpu);
+	while (readl(&cmwkup->idlestdpllmpu) != ST_MN_BYPASS)
+		;
+
+	clksel = clksel & (~CLK_SEL_MASK);
+	clksel = clksel | ((MPUPLL_M << CLK_SEL_SHIFT) | MPUPLL_N);
+	writel(clksel, &cmwkup->clkseldpllmpu);
+
+	div_m2 = div_m2 & ~CLK_DIV_MASK;
+	div_m2 = div_m2 | MPUPLL_M2;
+	writel(div_m2, &cmwkup->divm2dpllmpu);
+
+	clkmode = clkmode | CLK_MODE_SEL;
+	writel(clkmode, &cmwkup->clkmoddpllmpu);
+
+	while (readl(&cmwkup->idlestdpllmpu) != ST_DPLL_CLK)
+		;
+}
+
+static void core_pll_config(void)
+{
+	u32 clkmode, clksel, div_m4, div_m5, div_m6;
+
+	clkmode = readl(&cmwkup->clkmoddpllcore);
+	clksel = readl(&cmwkup->clkseldpllcore);
+	div_m4 = readl(&cmwkup->divm4dpllcore);
+	div_m5 = readl(&cmwkup->divm5dpllcore);
+	div_m6 = readl(&cmwkup->divm6dpllcore);
+
+	/* Set the PLL to bypass Mode */
+	writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllcore);
+
+	while (readl(&cmwkup->idlestdpllcore) != ST_MN_BYPASS)
+		;
+
+	clksel = clksel & (~CLK_SEL_MASK);
+	clksel = clksel | ((COREPLL_M << CLK_SEL_SHIFT) | COREPLL_N);
+	writel(clksel, &cmwkup->clkseldpllcore);
+
+	div_m4 = div_m4 & ~CLK_DIV_MASK;
+	div_m4 = div_m4 | COREPLL_M4;
+	writel(div_m4, &cmwkup->divm4dpllcore);
+
+	div_m5 = div_m5 & ~CLK_DIV_MASK;
+	div_m5 = div_m5 | COREPLL_M5;
+	writel(div_m5, &cmwkup->divm5dpllcore);
+
+	div_m6 = div_m6 & ~CLK_DIV_MASK;
+	div_m6 = div_m6 | COREPLL_M6;
+	writel(div_m6, &cmwkup->divm6dpllcore);
+
+	clkmode = clkmode | CLK_MODE_SEL;
+	writel(clkmode, &cmwkup->clkmoddpllcore);
+
+	while (readl(&cmwkup->idlestdpllcore) != ST_DPLL_CLK)
+		;
+}
+
+static void per_pll_config(void)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = readl(&cmwkup->clkmoddpllper);
+	clksel = readl(&cmwkup->clkseldpllper);
+	div_m2 = readl(&cmwkup->divm2dpllper);
+
+	/* Set the PLL to bypass Mode */
+	writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllper);
+
+	while (readl(&cmwkup->idlestdpllper) != ST_MN_BYPASS)
+		;
+
+	clksel = clksel & (~CLK_SEL_MASK);
+	clksel = clksel | ((PERPLL_M << CLK_SEL_SHIFT) | PERPLL_N);
+	writel(clksel, &cmwkup->clkseldpllper);
+
+	div_m2 = div_m2 & ~CLK_DIV2_MASK;
+	div_m2 = div_m2 | PERPLL_M2;
+	writel(div_m2, &cmwkup->divm2dpllper);
+
+	clkmode = clkmode | CLK_MODE_SEL;
+	writel(clkmode, &cmwkup->clkmoddpllper);
+
+	while (readl(&cmwkup->idlestdpllper) != ST_DPLL_CLK)
+		;
+
+	writel(DPLL_CLKDCOLDO_GATE_CTRL, &cmwkup->clkdcoldodpllper);
+}
+
+void ddr_pll_config(unsigned int ddrpll_m)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = readl(&cmwkup->clkmoddpllddr);
+	clksel = readl(&cmwkup->clkseldpllddr);
+	div_m2 = readl(&cmwkup->divm2dpllddr);
+
+	/* Set the PLL to bypass Mode */
+	clkmode = (clkmode & CLK_MODE_MASK) | PLL_BYPASS_MODE;
+	writel(clkmode, &cmwkup->clkmoddpllddr);
+
+	/* Wait till bypass mode is enabled */
+	while ((readl(&cmwkup->idlestdpllddr) & ST_MN_BYPASS)
+				!= ST_MN_BYPASS)
+		;
+
+	clksel = clksel & (~CLK_SEL_MASK);
+	clksel = clksel | ((ddrpll_m << CLK_SEL_SHIFT) | DDRPLL_N);
+	writel(clksel, &cmwkup->clkseldpllddr);
+
+	div_m2 = div_m2 & CLK_DIV_SEL;
+	div_m2 = div_m2 | DDRPLL_M2;
+	writel(div_m2, &cmwkup->divm2dpllddr);
+
+	clkmode = (clkmode & CLK_MODE_MASK) | CLK_MODE_SEL;
+	writel(clkmode, &cmwkup->clkmoddpllddr);
+
+	/* Wait till dpll is locked */
+	while ((readl(&cmwkup->idlestdpllddr) & ST_DPLL_CLK) != ST_DPLL_CLK)
+		;
+}
+
+void enable_emif_clocks(void)
+{
+	/* Enable the  EMIF_FW Functional clock */
+	writel(PRCM_MOD_EN, &cmper->emiffwclkctrl);
+	/* Enable EMIF0 Clock */
+	writel(PRCM_MOD_EN, &cmper->emifclkctrl);
+	/* Poll if module is functional */
+	while ((readl(&cmper->emifclkctrl)) != PRCM_MOD_EN)
+		;
+}
+
+/*
+ * Configure the PLL/PRCM for necessary peripherals
+ */
+void pll_init()
+{
+	mpu_pll_config();
+	core_pll_config();
+	per_pll_config();
+
+	/* Enable the required interconnect clocks */
+	enable_interface_clocks();
+
+	/* Power domain wake up transition */
+	power_domain_wkup_transition();
+
+	/* Enable the required peripherals */
+	enable_per_clocks();
+}