[ARM] msm: clock: provide clk_*() api support for

Makes use of the proc_comm interface to provide clock control on
MSM7X01A family SoCs.

Signed-off-by: Brian Swetland <swetland@google.com>

arch/arm/mach-msm/Makefile

@@ -1,6 +1,7 @@
 obj-y += io.o idle.o irq.o timer.o dma.o
 obj-y += devices.o
 obj-y += proc_comm.o
+obj-y += clock.o clock-7x01a.o
 
 obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o
 

arch/arm/mach-msm/board-halibut.c

@@ -79,6 +79,7 @@ static void __init halibut_init(void)
 static void __init halibut_map_io(void)
 {
 	msm_map_common_io();
+	msm_clock_init();
 }
 
 MACHINE_START(HALIBUT, "Halibut Board (QCT SURF7200A)")

arch/arm/mach-msm/clock-7x01a.c

@@ -0,0 +1,126 @@
+/* arch/arm/mach-msm/clock-7x01a.c
+ *
+ * Clock tables for MSM7X01A
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2007 QUALCOMM Incorporated
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#include "clock.h"
+#include "devices.h"
+
+/* clock IDs used by the modem processor */
+
+#define ACPU_CLK	0   /* Applications processor clock */
+#define ADM_CLK		1   /* Applications data mover clock */
+#define ADSP_CLK	2   /* ADSP clock */
+#define EBI1_CLK	3   /* External bus interface 1 clock */
+#define EBI2_CLK	4   /* External bus interface 2 clock */
+#define ECODEC_CLK	5   /* External CODEC clock */
+#define EMDH_CLK	6   /* External MDDI host clock */
+#define GP_CLK		7   /* General purpose clock */
+#define GRP_CLK		8   /* Graphics clock */
+#define I2C_CLK		9   /* I2C clock */
+#define ICODEC_RX_CLK	10  /* Internal CODEX RX clock */
+#define ICODEC_TX_CLK	11  /* Internal CODEX TX clock */
+#define IMEM_CLK	12  /* Internal graphics memory clock */
+#define MDC_CLK		13  /* MDDI client clock */
+#define MDP_CLK		14  /* Mobile display processor clock */
+#define PBUS_CLK	15  /* Peripheral bus clock */
+#define PCM_CLK		16  /* PCM clock */
+#define PMDH_CLK	17  /* Primary MDDI host clock */
+#define SDAC_CLK	18  /* Stereo DAC clock */
+#define SDC1_CLK	19  /* Secure Digital Card clocks */
+#define SDC1_PCLK	20
+#define SDC2_CLK	21
+#define SDC2_PCLK	22
+#define SDC3_CLK	23
+#define SDC3_PCLK	24
+#define SDC4_CLK	25
+#define SDC4_PCLK	26
+#define TSIF_CLK	27  /* Transport Stream Interface clocks */
+#define TSIF_REF_CLK	28
+#define TV_DAC_CLK	29  /* TV clocks */
+#define TV_ENC_CLK	30
+#define UART1_CLK	31  /* UART clocks */
+#define UART2_CLK	32
+#define UART3_CLK	33
+#define UART1DM_CLK	34
+#define UART2DM_CLK	35
+#define USB_HS_CLK	36  /* High speed USB core clock */
+#define USB_HS_PCLK	37  /* High speed USB pbus clock */
+#define USB_OTG_CLK	38  /* Full speed USB clock */
+#define VDC_CLK		39  /* Video controller clock */
+#define VFE_CLK		40  /* Camera / Video Front End clock */
+#define VFE_MDC_CLK	41  /* VFE MDDI client clock */
+
+#define NR_CLKS		42
+
+#define CLOCK(clk_name, clk_id, clk_dev, clk_flags) {	\
+	.name = clk_name, \
+	.id = clk_id, \
+	.flags = clk_flags, \
+	.dev = clk_dev, \
+	}
+
+#define OFF CLKFLAG_AUTO_OFF
+#define MINMAX CLKFLAG_USE_MIN_MAX_TO_SET
+
+struct clk msm_clocks[] = {
+	CLOCK("adm_clk",	ADM_CLK,	NULL, 0),
+	CLOCK("adsp_clk",	ADSP_CLK,	NULL, 0),
+	CLOCK("ebi1_clk",	EBI1_CLK,	NULL, 0),
+	CLOCK("ebi2_clk",	EBI2_CLK,	NULL, 0),
+	CLOCK("ecodec_clk",	ECODEC_CLK,	NULL, 0),
+	CLOCK("emdh_clk",	EMDH_CLK,	NULL, OFF),
+	CLOCK("gp_clk",		GP_CLK,		NULL, 0),
+	CLOCK("grp_clk",	GRP_CLK,	NULL, OFF),
+	CLOCK("i2c_clk",	I2C_CLK,	&msm_device_i2c.dev, 0),
+	CLOCK("icodec_rx_clk",	ICODEC_RX_CLK,	NULL, 0),
+	CLOCK("icodec_tx_clk",	ICODEC_TX_CLK,	NULL, 0),
+	CLOCK("imem_clk",	IMEM_CLK,	NULL, OFF),
+	CLOCK("mdc_clk",	MDC_CLK,	NULL, 0),
+	CLOCK("mdp_clk",	MDP_CLK,	NULL, OFF),
+	CLOCK("pbus_clk",	PBUS_CLK,	NULL, 0),
+	CLOCK("pcm_clk",	PCM_CLK,	NULL, 0),
+	CLOCK("pmdh_clk",	PMDH_CLK,	NULL, OFF | MINMAX),
+	CLOCK("sdac_clk",	SDAC_CLK,	NULL, OFF),
+	CLOCK("sdc_clk",	SDC1_CLK,	&msm_device_sdc1.dev, OFF),
+	CLOCK("sdc_pclk",	SDC1_PCLK,	&msm_device_sdc1.dev, OFF),
+	CLOCK("sdc_clk",	SDC2_CLK,	&msm_device_sdc2.dev, OFF),
+	CLOCK("sdc_pclk",	SDC2_PCLK,	&msm_device_sdc2.dev, OFF),
+	CLOCK("sdc_clk",	SDC3_CLK,	&msm_device_sdc3.dev, OFF),
+	CLOCK("sdc_pclk",	SDC3_PCLK,	&msm_device_sdc3.dev, OFF),
+	CLOCK("sdc_clk",	SDC4_CLK,	&msm_device_sdc4.dev, OFF),
+	CLOCK("sdc_pclk",	SDC4_PCLK,	&msm_device_sdc4.dev, OFF),
+	CLOCK("tsif_clk",	TSIF_CLK,	NULL, 0),
+	CLOCK("tsif_ref_clk",	TSIF_REF_CLK,	NULL, 0),
+	CLOCK("tv_dac_clk",	TV_DAC_CLK,	NULL, 0),
+	CLOCK("tv_enc_clk",	TV_ENC_CLK,	NULL, 0),
+	CLOCK("uart_clk",	UART1_CLK,	&msm_device_uart1.dev, OFF),
+	CLOCK("uart_clk",	UART2_CLK,	&msm_device_uart2.dev, 0),
+	CLOCK("uart_clk",	UART3_CLK,	&msm_device_uart3.dev, OFF),
+	CLOCK("uart1dm_clk",	UART1DM_CLK,	NULL, OFF),
+	CLOCK("uart2dm_clk",	UART2DM_CLK,	NULL, 0),
+	CLOCK("usb_hs_clk",	USB_HS_CLK,	&msm_device_hsusb.dev, OFF),
+	CLOCK("usb_hs_pclk",	USB_HS_PCLK,	&msm_device_hsusb.dev, OFF),
+	CLOCK("usb_otg_clk",	USB_OTG_CLK,	NULL, 0),
+	CLOCK("vdc_clk",	VDC_CLK,	NULL, OFF | MINMAX),
+	CLOCK("vfe_clk",	VFE_CLK,	NULL, OFF),
+	CLOCK("vfe_mdc_clk",	VFE_MDC_CLK,	NULL, OFF),
+};
+
+unsigned msm_num_clocks = ARRAY_SIZE(msm_clocks);

arch/arm/mach-msm/clock.c

@@ -0,0 +1,218 @@
+/* arch/arm/mach-msm/clock.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2007 QUALCOMM Incorporated
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+
+#include "clock.h"
+#include "proc_comm.h"
+
+static DEFINE_MUTEX(clocks_mutex);
+static DEFINE_SPINLOCK(clocks_lock);
+static LIST_HEAD(clocks);
+
+/*
+ * glue for the proc_comm interface
+ */
+static inline int pc_clk_enable(unsigned id)
+{
+	return msm_proc_comm(PCOM_CLKCTL_RPC_ENABLE, &id, NULL);
+}
+
+static inline void pc_clk_disable(unsigned id)
+{
+	msm_proc_comm(PCOM_CLKCTL_RPC_DISABLE, &id, NULL);
+}
+
+static inline int pc_clk_set_rate(unsigned id, unsigned rate)
+{
+	return msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &rate);
+}
+
+static inline int pc_clk_set_min_rate(unsigned id, unsigned rate)
+{
+	return msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &rate);
+}
+
+static inline int pc_clk_set_max_rate(unsigned id, unsigned rate)
+{
+	return msm_proc_comm(PCOM_CLKCTL_RPC_MAX_RATE, &id, &rate);
+}
+
+static inline int pc_clk_set_flags(unsigned id, unsigned flags)
+{
+	return msm_proc_comm(PCOM_CLKCTL_RPC_SET_FLAGS, &id, &flags);
+}
+
+static inline unsigned pc_clk_get_rate(unsigned id)
+{
+	if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
+		return 0;
+	else
+		return id;
+}
+
+static inline unsigned pc_clk_is_enabled(unsigned id)
+{
+	if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
+		return 0;
+	else
+		return id;
+}
+
+static inline int pc_pll_request(unsigned id, unsigned on)
+{
+	on = !!on;
+	return msm_proc_comm(PCOM_CLKCTL_RPC_PLL_REQUEST, &id, &on);
+}
+
+/*
+ * Standard clock functions defined in include/linux/clk.h
+ */
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	struct clk *clk;
+
+	mutex_lock(&clocks_mutex);
+
+	list_for_each_entry(clk, &clocks, list)
+		if (!strcmp(id, clk->name) && clk->dev == dev)
+			goto found_it;
+
+	list_for_each_entry(clk, &clocks, list)
+		if (!strcmp(id, clk->name) && clk->dev == NULL)
+			goto found_it;
+
+	clk = ERR_PTR(-ENOENT);
+found_it:
+	mutex_unlock(&clocks_mutex);
+	return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&clocks_lock, flags);
+	clk->count++;
+	if (clk->count == 1)
+		pc_clk_enable(clk->id);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&clocks_lock, flags);
+	BUG_ON(clk->count == 0);
+	clk->count--;
+	if (clk->count == 0)
+		pc_clk_disable(clk->id);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return pc_clk_get_rate(clk->id);
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	int ret;
+	if (clk->flags & CLKFLAG_USE_MIN_MAX_TO_SET) {
+		ret = pc_clk_set_max_rate(clk->id, rate);
+		if (ret)
+			return ret;
+		return pc_clk_set_min_rate(clk->id, rate);
+	}
+	return pc_clk_set_rate(clk->id, rate);
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	return -ENOSYS;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+	return ERR_PTR(-ENOSYS);
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+int clk_set_flags(struct clk *clk, unsigned long flags)
+{
+	if (clk == NULL || IS_ERR(clk))
+		return -EINVAL;
+	return pc_clk_set_flags(clk->id, flags);
+}
+EXPORT_SYMBOL(clk_set_flags);
+
+
+void __init msm_clock_init(void)
+{
+	unsigned n;
+
+	spin_lock_init(&clocks_lock);
+	mutex_lock(&clocks_mutex);
+	for (n = 0; n < msm_num_clocks; n++)
+		list_add_tail(&msm_clocks[n].list, &clocks);
+	mutex_unlock(&clocks_mutex);
+}
+
+/* The bootloader and/or AMSS may have left various clocks enabled.
+ * Disable any clocks that belong to us (CLKFLAG_AUTO_OFF) but have
+ * not been explicitly enabled by a clk_enable() call.
+ */
+static int __init clock_late_init(void)
+{
+	unsigned long flags;
+	struct clk *clk;
+	unsigned count = 0;
+
+	mutex_lock(&clocks_mutex);
+	list_for_each_entry(clk, &clocks, list) {
+		if (clk->flags & CLKFLAG_AUTO_OFF) {
+			spin_lock_irqsave(&clocks_lock, flags);
+			if (!clk->count) {
+				count++;
+				pc_clk_disable(clk->id);
+			}
+			spin_unlock_irqrestore(&clocks_lock, flags);
+		}
+	}
+	mutex_unlock(&clocks_mutex);
+	pr_info("clock_late_init() disabled %d unused clocks\n", count);
+	return 0;
+}
+
+late_initcall(clock_late_init);