Add cpufreq driver

raspberrypi · Oct 8, 2012 · 996a468 · 996a468
1 parent ce1249d
commit 996a468
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Showing 8 changed files with 381 additions and 37 deletions.
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
@@ -1006,6 +1006,7 @@ config ARCH_BCM2708
 	select HAVE_SCHED_CLOCK
 	select NEED_MACH_MEMORY_H
 	select CLKDEV_LOOKUP
+	select ARCH_HAS_CPUFREQ
 	select GENERIC_CLOCKEVENTS
 	select ARM_ERRATA_411920
 	select MACH_BCM2708

diff --git a/arch/arm/configs/bcmrpi_defconfig b/arch/arm/configs/bcmrpi_defconfig
@@ -46,6 +46,12 @@ CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext3 rootwait"
 CONFIG_KEXEC=y
+CONFIG_CPU_FREQ=y
+CONFIG_CPU_FREQ_STAT=m
+CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+CONFIG_CPU_FREQ_GOV_POWERSAVE=y
+CONFIG_CPU_FREQ_GOV_USERSPACE=y
+CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
 CONFIG_CPU_IDLE=y
 CONFIG_VFP=y
 CONFIG_BINFMT_MISC=m

diff --git a/arch/arm/mach-bcm2708/include/mach/vcio.h b/arch/arm/mach-bcm2708/include/mach/vcio.h
@@ -27,17 +27,82 @@
 #define BCM_VCIO_DRIVER_NAME "bcm2708_vcio"
 
 /* Constants shared with the ARM identifying separate mailbox channels */
-#define MBOX_CHAN_POWER   0 /* for use by the power management interface */
-#define MBOX_CHAN_FB      1 /* for use by the frame buffer */
-#define MBOX_CHAN_VUART   2 /* for use by the virtual UART */
-#define MBOX_CHAN_VCHIQ   3 /* for use by the VCHIQ interface */
-#define MBOX_CHAN_LEDS    4 /* for use by the leds interface */
-#define MBOX_CHAN_BUTTONS 5 /* for use by the buttons interface */
-#define MBOX_CHAN_TOUCH   6 /* for use by the touchscreen interface */
+#define MBOX_CHAN_POWER    0 /* for use by the power management interface */
+#define MBOX_CHAN_FB       1 /* for use by the frame buffer */
+#define MBOX_CHAN_VCHIQ    3 /* for use by the VCHIQ interface */
 #define MBOX_CHAN_PROPERTY 8 /* for use by the property channel */
-#define MBOX_CHAN_COUNT   9
+#define MBOX_CHAN_COUNT    9
+
+/* Mailbox property tags */
+enum {
+	VCMSG_PROPERTY_END               = 0x00000000,
+	VCMSG_GET_FIRMWARE_REVISION      = 0x00000001,
+	VCMSG_GET_BOARD_MODEL            = 0x00010001,
+	VCMSG_GET_BOARD_REVISION	 = 0x00020002,
+	VCMSG_GET_BOARD_MAC_ADDRESS	 = 0x00020003,
+	VCMSG_GET_BOARD_SERIAL		 = 0x00020004,
+	VCMSG_GET_ARM_MEMORY		 = 0x00020005,
+	VCMSG_GET_VC_MEMORY		 = 0x00020006,
+	VCMSG_GET_CLOCKS		 = 0x00020007,
+	VCMSG_GET_COMMAND_LINE           = 0x00050001,
+	VCMSG_GET_DMA_CHANNELS           = 0x00060001,
+	VCMSG_GET_POWER_STATE            = 0x00020001,
+	VCMSG_GET_TIMING		 = 0x00020002,
+	VCMSG_SET_POWER_STATE            = 0x00028001,
+	VCMSG_GET_CLOCK_STATE            = 0x00030001,
+	VCMSG_SET_CLOCK_STATE            = 0x00038001,
+	VCMSG_GET_CLOCK_RATE             = 0x00030002,
+	VCMSG_SET_CLOCK_RATE             = 0x00038002,
+	VCMSG_GET_VOLTAGE                = 0x00030003,
+	VCMSG_SET_VOLTAGE                = 0x00038003,
+	VCMSG_GET_MAX_CLOCK              = 0x00030004,
+	VCMSG_GET_MAX_VOLTAGE            = 0x00030005,
+	VCMSG_GET_TEMPERATURE            = 0x00030006,
+	VCMSG_GET_MIN_CLOCK              = 0x00030007,
+	VCMSG_GET_MIN_VOLTAGE            = 0x00030008,
+	VCMSG_GET_TURBO                  = 0x00030009,
+	VCMSG_SET_TURBO                  = 0x00038009,
+	VCMSG_SET_ALLOCATE_BUFFER        = 0x00040001,
+	VCMSG_SET_RELEASE_BUFFER         = 0x00048001,
+	VCMSG_SET_BLANK_SCREEN           = 0x00040002,
+	VCMSG_TST_BLANK_SCREEN           = 0x00044002,
+	VCMSG_GET_PHYSICAL_WIDTH_HEIGHT  = 0x00040003,
+	VCMSG_TST_PHYSICAL_WIDTH_HEIGHT  = 0x00044003,
+	VCMSG_SET_PHYSICAL_WIDTH_HEIGHT  = 0x00048003,
+	VCMSG_GET_VIRTUAL_WIDTH_HEIGHT   = 0x00040004,
+	VCMSG_TST_VIRTUAL_WIDTH_HEIGHT   = 0x00044004,
+	VCMSG_SET_VIRTUAL_WIDTH_HEIGHT   = 0x00048004,
+	VCMSG_GET_DEPTH                  = 0x00040005,
+	VCMSG_TST_DEPTH                  = 0x00044005,
+	VCMSG_SET_DEPTH                  = 0x00048005,
+	VCMSG_GET_PIXEL_ORDER            = 0x00040006,
+	VCMSG_TST_PIXEL_ORDER            = 0x00044006,
+	VCMSG_SET_PIXEL_ORDER            = 0x00048006,
+	VCMSG_GET_ALPHA_MODE             = 0x00040007,
+	VCMSG_TST_ALPHA_MODE             = 0x00044007,
+	VCMSG_SET_ALPHA_MODE             = 0x00048007,
+	VCMSG_GET_PITCH                  = 0x00040008,
+	VCMSG_TST_PITCH                  = 0x00044008,
+	VCMSG_SET_PITCH                  = 0x00048008,
+	VCMSG_GET_VIRTUAL_OFFSET         = 0x00040009,
+	VCMSG_TST_VIRTUAL_OFFSET         = 0x00044009,
+	VCMSG_SET_VIRTUAL_OFFSET         = 0x00048009,
+	VCMSG_GET_OVERSCAN               = 0x0004000a,
+	VCMSG_TST_OVERSCAN               = 0x0004400a,
+	VCMSG_SET_OVERSCAN               = 0x0004800a,
+	VCMSG_GET_PALETTE                = 0x0004000b,
+	VCMSG_TST_PALETTE                = 0x0004400b,
+	VCMSG_SET_PALETTE                = 0x0004800b,
+	VCMSG_GET_LAYER                  = 0x0004000c,
+	VCMSG_TST_LAYER                  = 0x0004400c,
+	VCMSG_SET_LAYER                  = 0x0004800c,
+	VCMSG_GET_TRANSFORM              = 0x0004000d,
+	VCMSG_TST_TRANSFORM              = 0x0004400d,
+	VCMSG_SET_TRANSFORM              = 0x0004800d,
+};
 
 extern int /*rc*/ bcm_mailbox_read(unsigned chan, uint32_t *data28);
 extern int /*rc*/ bcm_mailbox_write(unsigned chan, uint32_t data28);
+extern int /*rc*/ bcm_mailbox_property(void *data, int size);
 
 #endif
diff --git a/arch/arm/mach-bcm2708/vc_mem.c b/arch/arm/mach-bcm2708/vc_mem.c
@@ -128,44 +128,33 @@ struct vc_set_msg {
 	uint32_t end_tag;			/* an end identifier, should be set to NULL */
 };
 
-#define VCMSG_GET_ARM_MEMORY 0x00010005
-#define VCMSG_GET_VC_MEMORY  0x00010006
-
 static void vc_mem_update(void)
 {
-	uint32_t success;
-	dma_addr_t vc_mem;						/* the memory address accessed from videocore */
-	struct vc_set_msg *get_mem;					/* the memory address accessed from driver */
-
-	/* allocate some memory for the messages to use throughout the lifetime of the driver, use the larger of the two message structures */
-	get_mem = (struct vc_set_msg *)dma_alloc_coherent(NULL, PAGE_ALIGN(sizeof(struct vc_set_msg)), &vc_mem, GFP_ATOMIC); 
-	/* clear any garbage */
-	memset(get_mem, 0, sizeof(struct vc_set_msg));
+	struct vc_set_msg msg;					/* the memory address accessed from driver */
+	uint32_t s;
+
+	memset(&msg, 0, sizeof msg);
 	/* create the message */
-	get_mem->msg_size = sizeof(struct vc_set_msg);
-	get_mem->tag[0].tag_id = VCMSG_GET_VC_MEMORY;
-	get_mem->tag[0].buffer_size = 8;
-	get_mem->tag[0].data_size   = 0;
-	get_mem->tag[1].tag_id = VCMSG_GET_ARM_MEMORY;
-	get_mem->tag[1].buffer_size = 8;
-	get_mem->tag[1].data_size   = 0;
+	msg.msg_size = sizeof msg;
+	msg.tag[0].tag_id = VCMSG_GET_VC_MEMORY;
+	msg.tag[0].buffer_size = 8;
+	msg.tag[0].data_size   = 0;
+	msg.tag[1].tag_id = VCMSG_GET_ARM_MEMORY;
+	msg.tag[1].buffer_size = 8;
+	msg.tag[1].data_size   = 0;
 
 	/* send the message */
-	wmb();
-	bcm_mailbox_write(MBOX_CHAN_PROPERTY,(uint32_t)vc_mem);
-	bcm_mailbox_read(MBOX_CHAN_PROPERTY, &success);
-	rmb();
+	s = bcm_mailbox_property(&msg, sizeof msg);
 
-	LOG_DBG("%s: resp %x, vcbase=%x vcsize=%x armbase=%x armsize=%x", __func__, get_mem->request_code, 
-		get_mem->tag[0].base, get_mem->tag[0].size, get_mem->tag[1].base, get_mem->tag[1].size);
+	LOG_DBG("%s: success=%d resp %x, vcbase=%x vcsize=%x armbase=%x armsize=%x", __func__, s, msg.request_code, 
+		msg.tag[0].base, msg.tag[0].size, msg.tag[1].base, msg.tag[1].size);
 
 	/* check we're all good */
-	if (get_mem->request_code & 0x80000000) {
-		mm_vc_mem_base = get_mem->tag[0].base;
-		mm_vc_mem_size = get_mem->tag[0].size+get_mem->tag[1].size;
-		mm_vc_mem_phys_addr = get_mem->tag[1].base;
+	if (s == 0 && msg.request_code & 0x80000000) {
+		mm_vc_mem_base = msg.tag[0].base;
+		mm_vc_mem_size = msg.tag[0].size+msg.tag[1].size;
+		mm_vc_mem_phys_addr = msg.tag[1].base;
 	}
-	dma_free_coherent(NULL, PAGE_ALIGN(sizeof(struct vc_set_msg)), (void *)get_mem, vc_mem);
 }
 
 

diff --git a/arch/arm/mach-bcm2708/vcio.c b/arch/arm/mach-bcm2708/vcio.c
@@ -216,6 +216,40 @@ static void dev_mbox_register(const char *dev_name, struct device *dev)
 	mbox_dev = dev;
 }
 
+extern int bcm_mailbox_property(void *data, int size)
+{
+	uint32_t success;
+	dma_addr_t mem_bus;				/* the memory address accessed from videocore */
+	void *mem_kern;					/* the memory address accessed from driver */
+	int s = 0;
+
+	/* allocate some memory for the messages communicating with GPU */
+	mem_kern = dma_alloc_coherent(NULL, PAGE_ALIGN(size), &mem_bus, GFP_ATOMIC);
+	if (mem_kern) {
+		/* create the message */
+		memcpy(mem_kern, data, size);
+
+		/* send the message */
+		wmb();
+		s = bcm_mailbox_write(MBOX_CHAN_PROPERTY, (uint32_t)mem_bus);
+		if (s == 0) {
+			s = bcm_mailbox_read(MBOX_CHAN_PROPERTY, &success);
+		}
+		if (s == 0) {
+			/* copy the response */
+			rmb();
+			memcpy(data, mem_kern, size);
+		}
+		dma_free_coherent(NULL, PAGE_ALIGN(size), mem_kern, mem_bus);
+	} else {
+		s = -ENOMEM;
+	}
+	if (s != 0)
+		printk(KERN_ERR DRIVER_NAME ": %s failed (%d)\n", __func__, s);
+	return s;
+}
+EXPORT_SYMBOL_GPL(bcm_mailbox_property);
+
 /* ----------------------------------------------------------------------
  *	Platform Device for Mailbox
  * -------------------------------------------------------------------- */

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
@@ -76,3 +76,12 @@ config ARM_EXYNOS5250_CPUFREQ
 	help
 	  This adds the CPUFreq driver for Samsung EXYNOS5250
 	  SoC.
+
+config ARM_BCM2835_CPUFREQ
+	bool "BCM2835 Driver"
+	default y
+	help
+	  This adds the CPUFreq driver for BCM2835
+
+	  If in doubt, say N.
+
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ)	+= exynos4210-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ)	+= exynos4x12-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ)	+= exynos5250-cpufreq.o
 obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)     += omap-cpufreq.o
+obj-$(CONFIG_ARM_BCM2835_CPUFREQ)	+= bcm2835-cpufreq.o
 
 ##################################################################################
 # PowerPC platform drivers