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authorTom Rini <trini@konsulko.com>2016-11-07 21:34:54 -0500
committerTom Rini <trini@konsulko.com>2016-11-21 14:07:29 -0500
commit983e37007da506e8145f9b3a9e1dce5c11116fb0 (patch)
treec1d5449e1c56e17f22bb4f75b6f11336abca41a4 /arch/arm/mach-omap2/vc.c
parent272686eb7576c02df4616bcf893fde993e7ba57e (diff)
arm: Introduce arch/arm/mach-omap2 for OMAP2 derivative platforms
This moves what was in arch/arm/cpu/armv7/omap-common in to arch/arm/mach-omap2 and moves arch/arm/cpu/armv7/{am33xx,omap3,omap4,omap5} in to arch/arm/mach-omap2 as subdirectories. All refernces to the former locations are updated to the current locations. For the logic to decide what our outputs are, consolidate the tests into a single config.mk rather than including 4. Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/mach-omap2/vc.c')
-rw-r--r--arch/arm/mach-omap2/vc.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
new file mode 100644
index 0000000000..a68f1d145d
--- /dev/null
+++ b/arch/arm/mach-omap2/vc.c
@@ -0,0 +1,151 @@
+/*
+ * Voltage Controller implementation for OMAP
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ * Nishanth Menon
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/omap_common.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/clock.h>
+
+/*
+ * Define Master code if there are multiple masters on the I2C_SR bus.
+ * Normally not required
+ */
+#ifndef CONFIG_OMAP_VC_I2C_HS_MCODE
+#define CONFIG_OMAP_VC_I2C_HS_MCODE 0x0
+#endif
+
+/* Register defines and masks for VC IP Block */
+/* PRM_VC_CFG_I2C_MODE */
+#define PRM_VC_CFG_I2C_MODE_DFILTEREN_BIT (0x1 << 6)
+#define PRM_VC_CFG_I2C_MODE_SRMODEEN_BIT (0x1 << 4)
+#define PRM_VC_CFG_I2C_MODE_HSMODEEN_BIT (0x1 << 3)
+#define PRM_VC_CFG_I2C_MODE_HSMCODE_SHIFT 0x0
+#define PRM_VC_CFG_I2C_MODE_HSMCODE_MASK 0x3
+
+/* PRM_VC_CFG_I2C_CLK */
+#define PRM_VC_CFG_I2C_CLK_HSCLL_SHIFT 24
+#define PRM_VC_CFG_I2C_CLK_HSCLL_MASK 0xFF
+#define PRM_VC_CFG_I2C_CLK_HSCLH_SHIFT 16
+#define PRM_VC_CFG_I2C_CLK_HSCLH_MASK 0xFF
+#define PRM_VC_CFG_I2C_CLK_SCLH_SHIFT 0
+#define PRM_VC_CFG_I2C_CLK_SCLH_MASK 0xFF
+#define PRM_VC_CFG_I2C_CLK_SCLL_SHIFT 8
+#define PRM_VC_CFG_I2C_CLK_SCLL_MASK (0xFF << 8)
+
+/* PRM_VC_VAL_BYPASS */
+#define PRM_VC_VAL_BYPASS_VALID_BIT (0x1 << 24)
+#define PRM_VC_VAL_BYPASS_SLAVEADDR_SHIFT 0
+#define PRM_VC_VAL_BYPASS_SLAVEADDR_MASK 0x7F
+#define PRM_VC_VAL_BYPASS_REGADDR_SHIFT 8
+#define PRM_VC_VAL_BYPASS_REGADDR_MASK 0xFF
+#define PRM_VC_VAL_BYPASS_DATA_SHIFT 16
+#define PRM_VC_VAL_BYPASS_DATA_MASK 0xFF
+
+/**
+ * omap_vc_init() - Initialization for Voltage controller
+ * @speed_khz: I2C buspeed in KHz
+ */
+static void omap_vc_init(u16 speed_khz)
+{
+ u32 val;
+ u32 sys_clk_khz, cycles_hi, cycles_low;
+
+ sys_clk_khz = get_sys_clk_freq() / 1000;
+
+ if (speed_khz > 400) {
+ puts("higher speed requested - throttle to 400Khz\n");
+ speed_khz = 400;
+ }
+
+ /*
+ * Setup the dedicated I2C controller for Voltage Control
+ * I2C clk - high period 40% low period 60%
+ */
+ speed_khz /= 10;
+ cycles_hi = sys_clk_khz * 4 / speed_khz;
+ cycles_low = sys_clk_khz * 6 / speed_khz;
+ /* values to be set in register - less by 5 & 7 respectively */
+ cycles_hi -= 5;
+ cycles_low -= 7;
+ val = (cycles_hi << PRM_VC_CFG_I2C_CLK_SCLH_SHIFT) |
+ (cycles_low << PRM_VC_CFG_I2C_CLK_SCLL_SHIFT);
+ writel(val, (*prcm)->prm_vc_cfg_i2c_clk);
+
+ val = CONFIG_OMAP_VC_I2C_HS_MCODE <<
+ PRM_VC_CFG_I2C_MODE_HSMCODE_SHIFT;
+ /* No HS mode for now */
+ val &= ~PRM_VC_CFG_I2C_MODE_HSMODEEN_BIT;
+ writel(val, (*prcm)->prm_vc_cfg_i2c_mode);
+}
+
+/**
+ * omap_vc_bypass_send_value() - Send a data using VC Bypass command
+ * @sa: 7 bit I2C slave address of the PMIC
+ * @reg_addr: I2C register address(8 bit) address in PMIC
+ * @reg_data: what 8 bit data to write
+ */
+int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data)
+{
+ /*
+ * Unfortunately we need to loop here instead of a defined time
+ * use arbitary large value
+ */
+ u32 timeout = 0xFFFF;
+ u32 reg_val;
+
+ sa &= PRM_VC_VAL_BYPASS_SLAVEADDR_MASK;
+ reg_addr &= PRM_VC_VAL_BYPASS_REGADDR_MASK;
+ reg_data &= PRM_VC_VAL_BYPASS_DATA_MASK;
+
+ /* program VC to send data */
+ reg_val = sa << PRM_VC_VAL_BYPASS_SLAVEADDR_SHIFT |
+ reg_addr << PRM_VC_VAL_BYPASS_REGADDR_SHIFT |
+ reg_data << PRM_VC_VAL_BYPASS_DATA_SHIFT;
+ writel(reg_val, (*prcm)->prm_vc_val_bypass);
+
+ /* Signal VC to send data */
+ writel(reg_val | PRM_VC_VAL_BYPASS_VALID_BIT,
+ (*prcm)->prm_vc_val_bypass);
+
+ /* Wait on VC to complete transmission */
+ do {
+ reg_val = readl((*prcm)->prm_vc_val_bypass) &
+ PRM_VC_VAL_BYPASS_VALID_BIT;
+ if (!reg_val)
+ break;
+
+ sdelay(100);
+ } while (--timeout);
+
+ /* Optional: cleanup PRM_IRQSTATUS_Ax */
+ /* In case we can do something about it in future.. */
+ if (!timeout)
+ return -1;
+
+ /* All good.. */
+ return 0;
+}
+
+void sri2c_init(void)
+{
+ static int sri2c = 1;
+
+ if (sri2c) {
+ omap_vc_init(PRM_VC_I2C_CHANNEL_FREQ_KHZ);
+ sri2c = 0;
+ }
+ return;
+}