ARM: OMAP5: Add Pipe3 PHY driver

Pipe3 PHY is used by SATA, USB3 and PCIe modules. This is
a driver for the Pipe3 PHY.

Signed-off-by: Roger Quadros <rogerq@ti.com>

3 files changed, 271 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/omap-common/Makefile b/arch/arm/cpu/armv7/omap-common/Makefile
index 4d3a165..bfaf814 100644
--- a/arch/arm/cpu/armv7/omap-common/Makefile
+++ b/arch/arm/cpu/armv7/omap-common/Makefile
@@ -17,6 +17,10 @@ obj-y	+= vc.o
 obj-y	+= abb.o
 endif
 
+ifneq ($(CONFIG_OMAP54XX),)
+COBJS	+= pipe3-phy.o
+endif
+
 ifeq ($(CONFIG_OMAP34XX),)
 obj-y	+= boot-common.o
 obj-y	+= lowlevel_init.o
diff --git a/arch/arm/cpu/armv7/omap-common/pipe3-phy.c b/arch/arm/cpu/armv7/omap-common/pipe3-phy.c
new file mode 100644
index 0000000..b71d769
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap-common/pipe3-phy.c
@@ -0,0 +1,231 @@
+/*
+ * TI PIPE3 PHY
+ *
+ * (C) Copyright 2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <sata.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include "pipe3-phy.h"
+
+/* PLLCTRL Registers */
+#define PLL_STATUS              0x00000004
+#define PLL_GO                  0x00000008
+#define PLL_CONFIGURATION1      0x0000000C
+#define PLL_CONFIGURATION2      0x00000010
+#define PLL_CONFIGURATION3      0x00000014
+#define PLL_CONFIGURATION4      0x00000020
+
+#define PLL_REGM_MASK           0x001FFE00
+#define PLL_REGM_SHIFT          9
+#define PLL_REGM_F_MASK         0x0003FFFF
+#define PLL_REGM_F_SHIFT        0
+#define PLL_REGN_MASK           0x000001FE
+#define PLL_REGN_SHIFT          1
+#define PLL_SELFREQDCO_MASK     0x0000000E
+#define PLL_SELFREQDCO_SHIFT    1
+#define PLL_SD_MASK             0x0003FC00
+#define PLL_SD_SHIFT            10
+#define SET_PLL_GO              0x1
+#define PLL_TICOPWDN            BIT(16)
+#define PLL_LDOPWDN             BIT(15)
+#define PLL_LOCK                0x2
+#define PLL_IDLE                0x1
+
+/* PHY POWER CONTROL Register */
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK         0x003FC000
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT        0xE
+
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK        0xFFC00000
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT       0x16
+
+#define OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON       0x3
+#define OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF      0x0
+
+
+#define PLL_IDLE_TIME   100     /* in milliseconds */
+#define PLL_LOCK_TIME   100     /* in milliseconds */
+
+static inline u32 omap_pipe3_readl(void __iomem *addr, unsigned offset)
+{
+	return __raw_readl(addr + offset);
+}
+
+static inline void omap_pipe3_writel(void __iomem *addr, unsigned offset,
+		u32 data)
+{
+	__raw_writel(data, addr + offset);
+}
+
+static struct pipe3_dpll_params *omap_pipe3_get_dpll_params(struct omap_pipe3
+									*pipe3)
+{
+	u32 rate;
+	struct pipe3_dpll_map *dpll_map = pipe3->dpll_map;
+
+	rate = get_sys_clk_freq();
+
+	for (; dpll_map->rate; dpll_map++) {
+		if (rate == dpll_map->rate)
+			return &dpll_map->params;
+	}
+
+	printf("%s: No DPLL configuration for %u Hz SYS CLK\n",
+	       __func__, rate);
+	return NULL;
+}
+
+
+static int omap_pipe3_wait_lock(struct omap_pipe3 *phy)
+{
+	u32 val;
+	int timeout = PLL_LOCK_TIME;
+
+	do {
+		mdelay(1);
+		val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
+		if (val & PLL_LOCK)
+			break;
+	} while (--timeout);
+
+	if (!(val & PLL_LOCK)) {
+		printf("%s: DPLL failed to lock\n", __func__);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int omap_pipe3_dpll_program(struct omap_pipe3 *phy)
+{
+	u32                     val;
+	struct pipe3_dpll_params *dpll_params;
+
+	dpll_params = omap_pipe3_get_dpll_params(phy);
+	if (!dpll_params) {
+		printf("%s: Invalid DPLL parameters\n", __func__);
+		return -EINVAL;
+	}
+
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGN_MASK;
+	val |= dpll_params->n << PLL_REGN_SHIFT;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
+	val &= ~PLL_SELFREQDCO_MASK;
+	val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
+
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGM_MASK;
+	val |= dpll_params->m << PLL_REGM_SHIFT;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION4);
+	val &= ~PLL_REGM_F_MASK;
+	val |= dpll_params->mf << PLL_REGM_F_SHIFT;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION4, val);
+
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION3);
+	val &= ~PLL_SD_MASK;
+	val |= dpll_params->sd << PLL_SD_SHIFT;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION3, val);
+
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_GO, SET_PLL_GO);
+
+	return omap_pipe3_wait_lock(phy);
+}
+
+static void omap_control_phy_power(struct omap_pipe3 *phy, int on)
+{
+	u32 val, rate;
+
+	val = readl(phy->power_reg);
+
+	rate = get_sys_clk_freq();
+	rate = rate/1000000;
+
+	if (on) {
+		val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
+		val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+		val |= rate <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
+	} else {
+		val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
+		val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+	}
+
+	writel(val, phy->power_reg);
+}
+
+int phy_pipe3_power_on(struct omap_pipe3 *phy)
+{
+	int ret;
+	u32 val;
+
+	/* Program the DPLL only if not locked */
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
+	if (!(val & PLL_LOCK)) {
+		ret = omap_pipe3_dpll_program(phy);
+		if (ret)
+			return ret;
+	} else {
+		/* else just bring it out of IDLE mode */
+		val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
+		if (val & PLL_IDLE) {
+			val &= ~PLL_IDLE;
+			omap_pipe3_writel(phy->pll_ctrl_base,
+					  PLL_CONFIGURATION2, val);
+			ret = omap_pipe3_wait_lock(phy);
+			if (ret)
+				return ret;
+		}
+	}
+
+	/* Power up the PHY */
+	omap_control_phy_power(phy, 1);
+
+	return 0;
+}
+
+int phy_pipe3_power_off(struct omap_pipe3 *phy)
+{
+	u32 val;
+	int timeout = PLL_IDLE_TIME;
+
+	/* Power down the PHY */
+	omap_control_phy_power(phy, 0);
+
+	/* Put DPLL in IDLE mode */
+	val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
+	val |= PLL_IDLE;
+	omap_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
+
+	/* wait for LDO and Oscillator to power down */
+	do {
+		mdelay(1);
+		val = omap_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
+		if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN))
+			break;
+	} while (--timeout);
+
+	if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) {
+		printf("%s: Failed to power down DPLL: PLL_STATUS 0x%x\n",
+		       __func__, val);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
diff --git a/arch/arm/cpu/armv7/omap-common/pipe3-phy.h b/arch/arm/cpu/armv7/omap-common/pipe3-phy.h
new file mode 100644
index 0000000..441f49a
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap-common/pipe3-phy.h
@@ -0,0 +1,36 @@
+/*
+ * TI PIPE3 PHY
+ *
+ * (C) Copyright 2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __OMAP_PIPE3_PHY_H
+#define __OMAP_PIPE3_PHY_H
+
+struct pipe3_dpll_params {
+	u16     m;
+	u8      n;
+	u8      freq:3;
+	u8      sd;
+	u32     mf;
+};
+
+struct pipe3_dpll_map {
+	unsigned long rate;
+	struct pipe3_dpll_params params;
+};
+
+struct omap_pipe3 {
+	void __iomem            *pll_ctrl_base;
+	void __iomem		*power_reg;
+	struct pipe3_dpll_map   *dpll_map;
+};
+
+
+int phy_pipe3_power_on(struct omap_pipe3 *phy);
+int phy_pipe3_power_off(struct omap_pipe3 *pipe3);
+
+#endif /* __OMAP_PIPE3_PHY_H */