arm: beaglebone: add first-stage support for AM335x and board

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 289 insertions, 0 deletions

diff --git a/arch/arm/mach-omap/am33xx_clock.c b/arch/arm/mach-omap/am33xx_clock.c
new file mode 100644
index 0000000000..a28540c919
--- /dev/null
+++ b/arch/arm/mach-omap/am33xx_clock.c
@@ -0,0 +1,289 @@
+/*
+ * pll.c
+ *
+ * Copyright (C) 2011 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; 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/io.h>
+#include <mach/am33xx-clock.h>
+
+#define PRCM_MOD_EN		0x2
+#define	PRCM_FORCE_WAKEUP	0x2
+
+#define PRCM_EMIF_CLK_ACTIVITY	(0x1 << 2)
+#define PRCM_L3_GCLK_ACTIVITY	(0x1 << 4)
+
+#define PLL_BYPASS_MODE	0x4
+#define PLL_LOCK_MODE	0x7
+#define PLL_MULTIPLIER_SHIFT	 8
+
+static void interface_clocks_enable(void)
+{
+	/* Enable all the Interconnect Modules */
+	__raw_writel(PRCM_MOD_EN, CM_PER_L3_CLKCTRL);
+	while (__raw_readl(CM_PER_L3_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_L4LS_CLKCTRL);
+	while (__raw_readl(CM_PER_L4LS_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_L4FW_CLKCTRL);
+	while (__raw_readl(CM_PER_L4FW_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_WKUP_L4WKUP_CLKCTRL);
+	while (__raw_readl(CM_WKUP_L4WKUP_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_L3_INSTR_CLKCTRL);
+	while (__raw_readl(CM_PER_L3_INSTR_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_L4HS_CLKCTRL);
+	while (__raw_readl(CM_PER_L4HS_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_SPI1_CLKCTRL);
+	while (__raw_readl(CM_PER_SPI1_CLKCTRL) != PRCM_MOD_EN);
+
+	/* GPIO0 */
+	__raw_writel(PRCM_MOD_EN, CM_WKUP_GPIO0_CLKCTRL);
+	while (__raw_readl(CM_WKUP_GPIO0_CLKCTRL) != PRCM_MOD_EN);
+}
+
+static void power_domain_transition_enable(void)
+{
+	/*
+	 * Force power domain wake up transition
+	 * Ensure that the corresponding interface clock is active before
+	 * using the peripheral
+	 */
+	__raw_writel(PRCM_FORCE_WAKEUP, CM_PER_L3_CLKSTCTRL);
+
+	__raw_writel(PRCM_FORCE_WAKEUP, CM_PER_L4LS_CLKSTCTRL);
+
+	__raw_writel(PRCM_FORCE_WAKEUP, CM_WKUP_CLKSTCTRL);
+
+	__raw_writel(PRCM_FORCE_WAKEUP, CM_PER_L4FW_CLKSTCTRL);
+
+	__raw_writel(PRCM_FORCE_WAKEUP, CM_PER_L3S_CLKSTCTRL);
+}
+
+/*
+ * Enable the module clock and the power domain for required peripherals
+ */
+static void per_clocks_enable(void)
+{
+	/* Enable the module clock */
+	__raw_writel(PRCM_MOD_EN, CM_PER_TIMER2_CLKCTRL);
+	while (__raw_readl(CM_PER_TIMER2_CLKCTRL) != PRCM_MOD_EN);
+
+	/* Select the Master osc 24 MHZ as Timer2 clock source */
+	__raw_writel(0x1, CLKSEL_TIMER2_CLK);
+
+	/* UART0 */
+	__raw_writel(PRCM_MOD_EN, CM_WKUP_UART0_CLKCTRL);
+	while (__raw_readl(CM_WKUP_UART0_CLKCTRL) != PRCM_MOD_EN);
+
+	/* UART3 */
+	__raw_writel(PRCM_MOD_EN, CM_PER_UART3_CLKCTRL);
+	while (__raw_readl(CM_PER_UART3_CLKCTRL) != PRCM_MOD_EN);
+
+	/* GPMC */
+	__raw_writel(PRCM_MOD_EN, CM_PER_GPMC_CLKCTRL);
+	while (__raw_readl(CM_PER_GPMC_CLKCTRL) != PRCM_MOD_EN);
+
+	/* ELM */
+	__raw_writel(PRCM_MOD_EN, CM_PER_ELM_CLKCTRL);
+	while (__raw_readl(CM_PER_ELM_CLKCTRL) != PRCM_MOD_EN);
+
+	/* i2c0 */
+	__raw_writel(PRCM_MOD_EN, CM_WKUP_I2C0_CLKCTRL);
+	while (__raw_readl(CM_WKUP_I2C0_CLKCTRL) != PRCM_MOD_EN);
+
+	/* i2c1 */
+	__raw_writel(PRCM_MOD_EN, CM_PER_I2C1_CLKCTRL);
+	while (__raw_readl(CM_PER_I2C1_CLKCTRL) != PRCM_MOD_EN);
+
+	/* i2c2 */
+	__raw_writel(PRCM_MOD_EN, CM_PER_I2C2_CLKCTRL);
+	while (__raw_readl(CM_PER_I2C2_CLKCTRL) != PRCM_MOD_EN);
+
+	/* Ethernet */
+	__raw_writel(PRCM_MOD_EN, CM_PER_CPGMAC0_CLKCTRL);
+	__raw_writel(PRCM_MOD_EN, CM_PER_CPSW_CLKSTCTRL);
+	while ((__raw_readl(CM_PER_CPGMAC0_CLKCTRL) & 0x30000) != 0x0);
+
+	/* MMC 0 & 1 */
+	__raw_writel(PRCM_MOD_EN, CM_PER_MMC0_CLKCTRL);
+	while (__raw_readl(CM_PER_MMC0_CLKCTRL) != PRCM_MOD_EN);
+	__raw_writel(PRCM_MOD_EN, CM_PER_MMC1_CLKCTRL);
+	while (__raw_readl(CM_PER_MMC1_CLKCTRL) != PRCM_MOD_EN);
+
+	/* Enable the control module though RBL would have done it*/
+	__raw_writel(PRCM_MOD_EN, CM_WKUP_CONTROL_CLKCTRL);
+	while (__raw_readl(CM_WKUP_CONTROL_CLKCTRL) != PRCM_MOD_EN);
+
+	/* SPI 0 & 1 */
+	__raw_writel(PRCM_MOD_EN, CM_PER_SPI0_CLKCTRL);
+	while (__raw_readl(CM_PER_SPI0_CLKCTRL) != PRCM_MOD_EN);
+
+	__raw_writel(PRCM_MOD_EN, CM_PER_SPI1_CLKCTRL);
+	while (__raw_readl(CM_PER_SPI1_CLKCTRL) != PRCM_MOD_EN);
+}
+
+static void mpu_pll_config(int mpupll_M)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = __raw_readl(CM_CLKMODE_DPLL_MPU);
+	clksel = __raw_readl(CM_CLKSEL_DPLL_MPU);
+	div_m2 = __raw_readl(CM_DIV_M2_DPLL_MPU);
+
+	/* Set the PLL to bypass Mode */
+	__raw_writel(PLL_BYPASS_MODE, CM_CLKMODE_DPLL_MPU);
+
+	while(__raw_readl(CM_IDLEST_DPLL_MPU) != 0x00000100);
+
+	clksel = clksel & (~0x7ffff);
+	clksel = clksel | ((mpupll_M << 0x8) | MPUPLL_N);
+	__raw_writel(clksel, CM_CLKSEL_DPLL_MPU);
+
+	div_m2 = div_m2 & ~0x1f;
+	div_m2 = div_m2 | MPUPLL_M2;
+	__raw_writel(div_m2, CM_DIV_M2_DPLL_MPU);
+
+	clkmode = clkmode | 0x7;
+	__raw_writel(clkmode, CM_CLKMODE_DPLL_MPU);
+
+	while(__raw_readl(CM_IDLEST_DPLL_MPU) != 0x1);
+}
+
+static void core_pll_config(void)
+{
+	u32 clkmode, clksel, div_m4, div_m5, div_m6;
+
+	clkmode = __raw_readl(CM_CLKMODE_DPLL_CORE);
+	clksel = __raw_readl(CM_CLKSEL_DPLL_CORE);
+	div_m4 = __raw_readl(CM_DIV_M4_DPLL_CORE);
+	div_m5 = __raw_readl(CM_DIV_M5_DPLL_CORE);
+	div_m6 = __raw_readl(CM_DIV_M6_DPLL_CORE);
+
+	/* Set the PLL to bypass Mode */
+	__raw_writel(PLL_BYPASS_MODE, CM_CLKMODE_DPLL_CORE);
+
+	while(__raw_readl(CM_IDLEST_DPLL_CORE) != 0x00000100);
+
+	clksel = clksel & (~0x7ffff);
+	clksel = clksel | ((COREPLL_M << 0x8) | COREPLL_N);
+	__raw_writel(clksel, CM_CLKSEL_DPLL_CORE);
+
+	div_m4 = div_m4 & ~0x1f;
+	div_m4 = div_m4 | COREPLL_M4;
+	__raw_writel(div_m4, CM_DIV_M4_DPLL_CORE);
+
+	div_m5 = div_m5 & ~0x1f;
+	div_m5 = div_m5 | COREPLL_M5;
+	__raw_writel(div_m5, CM_DIV_M5_DPLL_CORE);
+
+	div_m6 = div_m6 & ~0x1f;
+	div_m6 = div_m6 | COREPLL_M6;
+	__raw_writel(div_m6, CM_DIV_M6_DPLL_CORE);
+
+
+	clkmode = clkmode | 0x7;
+	__raw_writel(clkmode, CM_CLKMODE_DPLL_CORE);
+
+	while(__raw_readl(CM_IDLEST_DPLL_CORE) != 0x1);
+}
+
+static void per_pll_config(void)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = __raw_readl(CM_CLKMODE_DPLL_PER);
+	clksel = __raw_readl(CM_CLKSEL_DPLL_PER);
+	div_m2 = __raw_readl(CM_DIV_M2_DPLL_PER);
+
+	/* Set the PLL to bypass Mode */
+	__raw_writel(PLL_BYPASS_MODE, CM_CLKMODE_DPLL_PER);
+
+	while(__raw_readl(CM_IDLEST_DPLL_PER) != 0x00000100);
+
+	clksel = clksel & (~0x7ffff);
+	clksel = clksel | ((PERPLL_M << 0x8) | PERPLL_N);
+	__raw_writel(clksel, CM_CLKSEL_DPLL_PER);
+
+	div_m2 = div_m2 & ~0x7f;
+	div_m2 = div_m2 | PERPLL_M2;
+	__raw_writel(div_m2, CM_DIV_M2_DPLL_PER);
+
+	clkmode = clkmode | 0x7;
+	__raw_writel(clkmode, CM_CLKMODE_DPLL_PER);
+
+	while(__raw_readl(CM_IDLEST_DPLL_PER) != 0x1);
+}
+
+static void ddr_pll_config(void)
+{
+	u32 clkmode, clksel, div_m2;
+
+	clkmode = __raw_readl(CM_CLKMODE_DPLL_DDR);
+	clksel = __raw_readl(CM_CLKSEL_DPLL_DDR);
+	div_m2 = __raw_readl(CM_DIV_M2_DPLL_DDR);
+
+	/* Set the PLL to bypass Mode */
+	clkmode = (clkmode & 0xfffffff8) | 0x00000004;
+	__raw_writel(clkmode, CM_CLKMODE_DPLL_DDR);
+
+	while ((__raw_readl(CM_IDLEST_DPLL_DDR) & 0x00000100) != 0x00000100);
+
+	clksel = clksel & (~0x7ffff);
+	clksel = clksel | ((DDRPLL_M << 0x8) | DDRPLL_N);
+	__raw_writel(clksel, CM_CLKSEL_DPLL_DDR);
+
+	div_m2 = div_m2 & 0xFFFFFFE0;
+	div_m2 = div_m2 | DDRPLL_M2;
+	__raw_writel(div_m2, CM_DIV_M2_DPLL_DDR);
+
+	clkmode = (clkmode & 0xfffffff8) | 0x7;
+	__raw_writel(clkmode, CM_CLKMODE_DPLL_DDR);
+
+	while ((__raw_readl(CM_IDLEST_DPLL_DDR) & 0x00000001) != 0x1);
+}
+
+void enable_ddr_clocks(void)
+{
+	/* Enable the  EMIF_FW Functional clock */
+	__raw_writel(PRCM_MOD_EN, CM_PER_EMIF_FW_CLKCTRL);
+	/* Enable EMIF0 Clock */
+	__raw_writel(PRCM_MOD_EN, CM_PER_EMIF_CLKCTRL);
+	/* Poll for emif_gclk  & L3_G clock  are active */
+	while ((__raw_readl(CM_PER_L3_CLKSTCTRL) & (PRCM_EMIF_CLK_ACTIVITY |
+		PRCM_L3_GCLK_ACTIVITY)) != (PRCM_EMIF_CLK_ACTIVITY |
+		PRCM_L3_GCLK_ACTIVITY));
+	/* Poll if module is functional */
+	while ((__raw_readl(CM_PER_EMIF_CLKCTRL)) != PRCM_MOD_EN);
+
+}
+
+/*
+ * Configure the PLL/PRCM for necessary peripherals
+ */
+void pll_init()
+{
+	mpu_pll_config(MPUPLL_M_500);
+	core_pll_config();
+	per_pll_config();
+	ddr_pll_config();
+	/* Enable the required interconnect clocks */
+	interface_clocks_enable();
+	/* Enable power domain transition */
+	power_domain_transition_enable();
+	/* Enable the required peripherals */
+	per_clocks_enable();
+}