[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>
diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index d4d1dea..bfcb251 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/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
diff --git a/arch/arm/mach-msm/board-halibut.c b/arch/arm/mach-msm/board-halibut.c
index b263783..c2a96e3 100644
--- a/arch/arm/mach-msm/board-halibut.c
+++ b/arch/arm/mach-msm/board-halibut.c
@@ -79,6 +79,7 @@
static void __init halibut_map_io(void)
{
msm_map_common_io();
+ msm_clock_init();
}
MACHINE_START(HALIBUT, "Halibut Board (QCT SURF7200A)")
diff --git a/arch/arm/mach-msm/clock-7x01a.c b/arch/arm/mach-msm/clock-7x01a.c
new file mode 100644
index 0000000..62230a3
--- /dev/null
+++ b/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);
diff --git a/arch/arm/mach-msm/clock.c b/arch/arm/mach-msm/clock.c
new file mode 100644
index 0000000..3b1ce36
--- /dev/null
+++ b/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);
diff --git a/arch/arm/mach-msm/clock.h b/arch/arm/mach-msm/clock.h
new file mode 100644
index 0000000..f875e15
--- /dev/null
+++ b/arch/arm/mach-msm/clock.h
@@ -0,0 +1,48 @@
+/* arch/arm/mach-msm/clock.h
+ *
+ * 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.
+ *
+ */
+
+#ifndef __ARCH_ARM_MACH_MSM_CLOCK_H
+#define __ARCH_ARM_MACH_MSM_CLOCK_H
+
+#include <linux/list.h>
+
+#define CLKFLAG_INVERT 0x00000001
+#define CLKFLAG_NOINVERT 0x00000002
+#define CLKFLAG_NONEST 0x00000004
+#define CLKFLAG_NORESET 0x00000008
+
+#define CLK_FIRST_AVAILABLE_FLAG 0x00000100
+#define CLKFLAG_USE_MIN_MAX_TO_SET 0x00000200
+#define CLKFLAG_AUTO_OFF 0x00000400
+
+struct clk {
+ uint32_t id;
+ uint32_t count;
+ uint32_t flags;
+ const char *name;
+ struct list_head list;
+ struct device *dev;
+};
+
+#define A11S_CLK_CNTL_ADDR (MSM_CSR_BASE + 0x100)
+#define A11S_CLK_SEL_ADDR (MSM_CSR_BASE + 0x104)
+#define A11S_VDD_SVS_PLEVEL_ADDR (MSM_CSR_BASE + 0x124)
+
+extern struct clk msm_clocks[];
+extern unsigned msm_num_clocks;
+
+#endif
+
diff --git a/arch/arm/mach-msm/include/mach/board.h b/arch/arm/mach-msm/include/mach/board.h
index a763949..264d62e 100644
--- a/arch/arm/mach-msm/include/mach/board.h
+++ b/arch/arm/mach-msm/include/mach/board.h
@@ -33,5 +33,6 @@
void __init msm_map_common_io(void);
void __init msm_init_irq(void);
void __init msm_init_gpio(void);
+void __init msm_clock_init(void);
#endif