1626 lines
44 KiB
C
1626 lines
44 KiB
C
/*
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* Copyright (C) 2010,2015 Broadcom
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* Copyright (C) 2012 Stephen Warren
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* DOC: BCM2835 CPRMAN (clock manager for the "audio" domain)
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*
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* The clock tree on the 2835 has several levels. There's a root
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* oscillator running at 19.2Mhz. After the oscillator there are 5
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* PLLs, roughly divided as "camera", "ARM", "core", "DSI displays",
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* and "HDMI displays". Those 5 PLLs each can divide their output to
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* produce up to 4 channels. Finally, there is the level of clocks to
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* be consumed by other hardware components (like "H264" or "HDMI
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* state machine"), which divide off of some subset of the PLL
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* channels.
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*
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* All of the clocks in the tree are exposed in the DT, because the DT
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* may want to make assignments of the final layer of clocks to the
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* PLL channels, and some components of the hardware will actually
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* skip layers of the tree (for example, the pixel clock comes
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* directly from the PLLH PIX channel without using a CM_*CTL clock
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* generator).
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/bcm2835.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <dt-bindings/clock/bcm2835.h>
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#define CM_PASSWORD 0x5a000000
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#define CM_GNRICCTL 0x000
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#define CM_GNRICDIV 0x004
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# define CM_DIV_FRAC_BITS 12
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#define CM_VPUCTL 0x008
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#define CM_VPUDIV 0x00c
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#define CM_SYSCTL 0x010
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#define CM_SYSDIV 0x014
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#define CM_PERIACTL 0x018
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#define CM_PERIADIV 0x01c
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#define CM_PERIICTL 0x020
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#define CM_PERIIDIV 0x024
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#define CM_H264CTL 0x028
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#define CM_H264DIV 0x02c
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#define CM_ISPCTL 0x030
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#define CM_ISPDIV 0x034
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#define CM_V3DCTL 0x038
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#define CM_V3DDIV 0x03c
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#define CM_CAM0CTL 0x040
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#define CM_CAM0DIV 0x044
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#define CM_CAM1CTL 0x048
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#define CM_CAM1DIV 0x04c
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#define CM_CCP2CTL 0x050
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#define CM_CCP2DIV 0x054
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#define CM_DSI0ECTL 0x058
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#define CM_DSI0EDIV 0x05c
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#define CM_DSI0PCTL 0x060
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#define CM_DSI0PDIV 0x064
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#define CM_DPICTL 0x068
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#define CM_DPIDIV 0x06c
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#define CM_GP0CTL 0x070
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#define CM_GP0DIV 0x074
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#define CM_GP1CTL 0x078
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#define CM_GP1DIV 0x07c
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#define CM_GP2CTL 0x080
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#define CM_GP2DIV 0x084
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#define CM_HSMCTL 0x088
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#define CM_HSMDIV 0x08c
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#define CM_OTPCTL 0x090
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#define CM_OTPDIV 0x094
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#define CM_PCMCTL 0x098
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#define CM_PCMDIV 0x09c
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#define CM_PWMCTL 0x0a0
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#define CM_PWMDIV 0x0a4
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#define CM_SLIMCTL 0x0a8
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#define CM_SLIMDIV 0x0ac
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#define CM_SMICTL 0x0b0
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#define CM_SMIDIV 0x0b4
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/* no definition for 0x0b8 and 0x0bc */
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#define CM_TCNTCTL 0x0c0
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#define CM_TCNTDIV 0x0c4
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#define CM_TECCTL 0x0c8
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#define CM_TECDIV 0x0cc
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#define CM_TD0CTL 0x0d0
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#define CM_TD0DIV 0x0d4
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#define CM_TD1CTL 0x0d8
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#define CM_TD1DIV 0x0dc
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#define CM_TSENSCTL 0x0e0
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#define CM_TSENSDIV 0x0e4
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#define CM_TIMERCTL 0x0e8
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#define CM_TIMERDIV 0x0ec
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#define CM_UARTCTL 0x0f0
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#define CM_UARTDIV 0x0f4
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#define CM_VECCTL 0x0f8
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#define CM_VECDIV 0x0fc
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#define CM_PULSECTL 0x190
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#define CM_PULSEDIV 0x194
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#define CM_SDCCTL 0x1a8
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#define CM_SDCDIV 0x1ac
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#define CM_ARMCTL 0x1b0
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#define CM_EMMCCTL 0x1c0
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#define CM_EMMCDIV 0x1c4
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/* General bits for the CM_*CTL regs */
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# define CM_ENABLE BIT(4)
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# define CM_KILL BIT(5)
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# define CM_GATE_BIT 6
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# define CM_GATE BIT(CM_GATE_BIT)
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# define CM_BUSY BIT(7)
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# define CM_BUSYD BIT(8)
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# define CM_SRC_SHIFT 0
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# define CM_SRC_BITS 4
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# define CM_SRC_MASK 0xf
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# define CM_SRC_GND 0
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# define CM_SRC_OSC 1
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# define CM_SRC_TESTDEBUG0 2
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# define CM_SRC_TESTDEBUG1 3
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# define CM_SRC_PLLA_CORE 4
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# define CM_SRC_PLLA_PER 4
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# define CM_SRC_PLLC_CORE0 5
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# define CM_SRC_PLLC_PER 5
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# define CM_SRC_PLLC_CORE1 8
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# define CM_SRC_PLLD_CORE 6
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# define CM_SRC_PLLD_PER 6
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# define CM_SRC_PLLH_AUX 7
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# define CM_SRC_PLLC_CORE1 8
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# define CM_SRC_PLLC_CORE2 9
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#define CM_OSCCOUNT 0x100
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#define CM_PLLA 0x104
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# define CM_PLL_ANARST BIT(8)
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# define CM_PLLA_HOLDPER BIT(7)
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# define CM_PLLA_LOADPER BIT(6)
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# define CM_PLLA_HOLDCORE BIT(5)
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# define CM_PLLA_LOADCORE BIT(4)
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# define CM_PLLA_HOLDCCP2 BIT(3)
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# define CM_PLLA_LOADCCP2 BIT(2)
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# define CM_PLLA_HOLDDSI0 BIT(1)
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# define CM_PLLA_LOADDSI0 BIT(0)
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#define CM_PLLC 0x108
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# define CM_PLLC_HOLDPER BIT(7)
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# define CM_PLLC_LOADPER BIT(6)
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# define CM_PLLC_HOLDCORE2 BIT(5)
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# define CM_PLLC_LOADCORE2 BIT(4)
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# define CM_PLLC_HOLDCORE1 BIT(3)
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# define CM_PLLC_LOADCORE1 BIT(2)
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# define CM_PLLC_HOLDCORE0 BIT(1)
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# define CM_PLLC_LOADCORE0 BIT(0)
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#define CM_PLLD 0x10c
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# define CM_PLLD_HOLDPER BIT(7)
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# define CM_PLLD_LOADPER BIT(6)
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# define CM_PLLD_HOLDCORE BIT(5)
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# define CM_PLLD_LOADCORE BIT(4)
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# define CM_PLLD_HOLDDSI1 BIT(3)
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# define CM_PLLD_LOADDSI1 BIT(2)
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# define CM_PLLD_HOLDDSI0 BIT(1)
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# define CM_PLLD_LOADDSI0 BIT(0)
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#define CM_PLLH 0x110
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# define CM_PLLH_LOADRCAL BIT(2)
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# define CM_PLLH_LOADAUX BIT(1)
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# define CM_PLLH_LOADPIX BIT(0)
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#define CM_LOCK 0x114
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# define CM_LOCK_FLOCKH BIT(12)
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# define CM_LOCK_FLOCKD BIT(11)
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# define CM_LOCK_FLOCKC BIT(10)
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# define CM_LOCK_FLOCKB BIT(9)
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# define CM_LOCK_FLOCKA BIT(8)
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#define CM_EVENT 0x118
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#define CM_DSI1ECTL 0x158
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#define CM_DSI1EDIV 0x15c
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#define CM_DSI1PCTL 0x160
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#define CM_DSI1PDIV 0x164
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#define CM_DFTCTL 0x168
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#define CM_DFTDIV 0x16c
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#define CM_PLLB 0x170
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# define CM_PLLB_HOLDARM BIT(1)
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# define CM_PLLB_LOADARM BIT(0)
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#define A2W_PLLA_CTRL 0x1100
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#define A2W_PLLC_CTRL 0x1120
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#define A2W_PLLD_CTRL 0x1140
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#define A2W_PLLH_CTRL 0x1160
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#define A2W_PLLB_CTRL 0x11e0
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# define A2W_PLL_CTRL_PRST_DISABLE BIT(17)
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# define A2W_PLL_CTRL_PWRDN BIT(16)
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# define A2W_PLL_CTRL_PDIV_MASK 0x000007000
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# define A2W_PLL_CTRL_PDIV_SHIFT 12
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# define A2W_PLL_CTRL_NDIV_MASK 0x0000003ff
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# define A2W_PLL_CTRL_NDIV_SHIFT 0
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#define A2W_PLLA_ANA0 0x1010
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#define A2W_PLLC_ANA0 0x1030
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#define A2W_PLLD_ANA0 0x1050
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#define A2W_PLLH_ANA0 0x1070
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#define A2W_PLLB_ANA0 0x10f0
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#define A2W_PLL_KA_SHIFT 7
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#define A2W_PLL_KA_MASK GENMASK(9, 7)
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#define A2W_PLL_KI_SHIFT 19
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#define A2W_PLL_KI_MASK GENMASK(21, 19)
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#define A2W_PLL_KP_SHIFT 15
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#define A2W_PLL_KP_MASK GENMASK(18, 15)
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#define A2W_PLLH_KA_SHIFT 19
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#define A2W_PLLH_KA_MASK GENMASK(21, 19)
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#define A2W_PLLH_KI_LOW_SHIFT 22
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#define A2W_PLLH_KI_LOW_MASK GENMASK(23, 22)
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#define A2W_PLLH_KI_HIGH_SHIFT 0
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#define A2W_PLLH_KI_HIGH_MASK GENMASK(0, 0)
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#define A2W_PLLH_KP_SHIFT 1
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#define A2W_PLLH_KP_MASK GENMASK(4, 1)
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#define A2W_XOSC_CTRL 0x1190
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# define A2W_XOSC_CTRL_PLLB_ENABLE BIT(7)
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# define A2W_XOSC_CTRL_PLLA_ENABLE BIT(6)
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# define A2W_XOSC_CTRL_PLLD_ENABLE BIT(5)
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# define A2W_XOSC_CTRL_DDR_ENABLE BIT(4)
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# define A2W_XOSC_CTRL_CPR1_ENABLE BIT(3)
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# define A2W_XOSC_CTRL_USB_ENABLE BIT(2)
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# define A2W_XOSC_CTRL_HDMI_ENABLE BIT(1)
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# define A2W_XOSC_CTRL_PLLC_ENABLE BIT(0)
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#define A2W_PLLA_FRAC 0x1200
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#define A2W_PLLC_FRAC 0x1220
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#define A2W_PLLD_FRAC 0x1240
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#define A2W_PLLH_FRAC 0x1260
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#define A2W_PLLB_FRAC 0x12e0
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# define A2W_PLL_FRAC_MASK ((1 << A2W_PLL_FRAC_BITS) - 1)
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# define A2W_PLL_FRAC_BITS 20
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#define A2W_PLL_CHANNEL_DISABLE BIT(8)
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#define A2W_PLL_DIV_BITS 8
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#define A2W_PLL_DIV_SHIFT 0
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#define A2W_PLLA_DSI0 0x1300
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#define A2W_PLLA_CORE 0x1400
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#define A2W_PLLA_PER 0x1500
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#define A2W_PLLA_CCP2 0x1600
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#define A2W_PLLC_CORE2 0x1320
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#define A2W_PLLC_CORE1 0x1420
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#define A2W_PLLC_PER 0x1520
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#define A2W_PLLC_CORE0 0x1620
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#define A2W_PLLD_DSI0 0x1340
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#define A2W_PLLD_CORE 0x1440
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#define A2W_PLLD_PER 0x1540
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#define A2W_PLLD_DSI1 0x1640
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#define A2W_PLLH_AUX 0x1360
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#define A2W_PLLH_RCAL 0x1460
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#define A2W_PLLH_PIX 0x1560
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#define A2W_PLLH_STS 0x1660
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#define A2W_PLLH_CTRLR 0x1960
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#define A2W_PLLH_FRACR 0x1a60
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#define A2W_PLLH_AUXR 0x1b60
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#define A2W_PLLH_RCALR 0x1c60
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#define A2W_PLLH_PIXR 0x1d60
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#define A2W_PLLH_STSR 0x1e60
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#define A2W_PLLB_ARM 0x13e0
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#define A2W_PLLB_SP0 0x14e0
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#define A2W_PLLB_SP1 0x15e0
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#define A2W_PLLB_SP2 0x16e0
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#define LOCK_TIMEOUT_NS 100000000
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#define BCM2835_MAX_FB_RATE 1750000000u
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struct bcm2835_cprman {
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struct device *dev;
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void __iomem *regs;
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spinlock_t regs_lock;
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const char *osc_name;
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struct clk_onecell_data onecell;
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struct clk *clks[BCM2835_CLOCK_COUNT];
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};
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static inline void cprman_write(struct bcm2835_cprman *cprman, u32 reg, u32 val)
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{
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writel(CM_PASSWORD | val, cprman->regs + reg);
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}
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static inline u32 cprman_read(struct bcm2835_cprman *cprman, u32 reg)
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{
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return readl(cprman->regs + reg);
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}
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/*
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* These are fixed clocks. They're probably not all root clocks and it may
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* be possible to turn them on and off but until this is mapped out better
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* it's the only way they can be used.
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*/
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void __init bcm2835_init_clocks(void)
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{
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struct clk *clk;
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int ret;
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clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 126000000);
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if (IS_ERR(clk))
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pr_err("apb_pclk not registered\n");
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clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, 0, 3000000);
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if (IS_ERR(clk))
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pr_err("uart0_pclk not registered\n");
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ret = clk_register_clkdev(clk, NULL, "20201000.uart");
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if (ret)
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pr_err("uart0_pclk alias not registered\n");
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clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, 0, 125000000);
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if (IS_ERR(clk))
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pr_err("uart1_pclk not registered\n");
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ret = clk_register_clkdev(clk, NULL, "20215000.uart");
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if (ret)
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pr_err("uart1_pclk alias not registered\n");
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}
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struct bcm2835_pll_data {
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const char *name;
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u32 cm_ctrl_reg;
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u32 a2w_ctrl_reg;
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u32 frac_reg;
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u32 ana_reg_base;
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u32 reference_enable_mask;
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/* Bit in CM_LOCK to indicate when the PLL has locked. */
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u32 lock_mask;
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const struct bcm2835_pll_ana_bits *ana;
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unsigned long min_rate;
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unsigned long max_rate;
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/*
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* Highest rate for the VCO before we have to use the
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* pre-divide-by-2.
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*/
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unsigned long max_fb_rate;
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};
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struct bcm2835_pll_ana_bits {
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u32 mask0;
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u32 set0;
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u32 mask1;
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u32 set1;
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u32 mask3;
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u32 set3;
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u32 fb_prediv_mask;
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};
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static const struct bcm2835_pll_ana_bits bcm2835_ana_default = {
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.mask0 = 0,
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.set0 = 0,
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.mask1 = ~(A2W_PLL_KI_MASK | A2W_PLL_KP_MASK),
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.set1 = (2 << A2W_PLL_KI_SHIFT) | (8 << A2W_PLL_KP_SHIFT),
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.mask3 = ~A2W_PLL_KA_MASK,
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.set3 = (2 << A2W_PLL_KA_SHIFT),
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.fb_prediv_mask = BIT(14),
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};
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static const struct bcm2835_pll_ana_bits bcm2835_ana_pllh = {
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.mask0 = ~(A2W_PLLH_KA_MASK | A2W_PLLH_KI_LOW_MASK),
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.set0 = (2 << A2W_PLLH_KA_SHIFT) | (2 << A2W_PLLH_KI_LOW_SHIFT),
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.mask1 = ~(A2W_PLLH_KI_HIGH_MASK | A2W_PLLH_KP_MASK),
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.set1 = (6 << A2W_PLLH_KP_SHIFT),
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.mask3 = 0,
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.set3 = 0,
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.fb_prediv_mask = BIT(11),
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};
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/*
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* PLLA is the auxiliary PLL, used to drive the CCP2 (Compact Camera
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* Port 2) transmitter clock.
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*
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* It is in the PX LDO power domain, which is on when the AUDIO domain
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* is on.
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*/
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static const struct bcm2835_pll_data bcm2835_plla_data = {
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.name = "plla",
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.cm_ctrl_reg = CM_PLLA,
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.a2w_ctrl_reg = A2W_PLLA_CTRL,
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.frac_reg = A2W_PLLA_FRAC,
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.ana_reg_base = A2W_PLLA_ANA0,
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.reference_enable_mask = A2W_XOSC_CTRL_PLLA_ENABLE,
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.lock_mask = CM_LOCK_FLOCKA,
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.ana = &bcm2835_ana_default,
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.min_rate = 600000000u,
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.max_rate = 2400000000u,
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.max_fb_rate = BCM2835_MAX_FB_RATE,
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};
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/* PLLB is used for the ARM's clock. */
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static const struct bcm2835_pll_data bcm2835_pllb_data = {
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.name = "pllb",
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.cm_ctrl_reg = CM_PLLB,
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.a2w_ctrl_reg = A2W_PLLB_CTRL,
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.frac_reg = A2W_PLLB_FRAC,
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.ana_reg_base = A2W_PLLB_ANA0,
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.reference_enable_mask = A2W_XOSC_CTRL_PLLB_ENABLE,
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.lock_mask = CM_LOCK_FLOCKB,
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.ana = &bcm2835_ana_default,
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.min_rate = 600000000u,
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.max_rate = 3000000000u,
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.max_fb_rate = BCM2835_MAX_FB_RATE,
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};
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/*
|
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* PLLC is the core PLL, used to drive the core VPU clock.
|
|
*
|
|
* It is in the PX LDO power domain, which is on when the AUDIO domain
|
|
* is on.
|
|
*/
|
|
static const struct bcm2835_pll_data bcm2835_pllc_data = {
|
|
.name = "pllc",
|
|
.cm_ctrl_reg = CM_PLLC,
|
|
.a2w_ctrl_reg = A2W_PLLC_CTRL,
|
|
.frac_reg = A2W_PLLC_FRAC,
|
|
.ana_reg_base = A2W_PLLC_ANA0,
|
|
.reference_enable_mask = A2W_XOSC_CTRL_PLLC_ENABLE,
|
|
.lock_mask = CM_LOCK_FLOCKC,
|
|
|
|
.ana = &bcm2835_ana_default,
|
|
|
|
.min_rate = 600000000u,
|
|
.max_rate = 3000000000u,
|
|
.max_fb_rate = BCM2835_MAX_FB_RATE,
|
|
};
|
|
|
|
/*
|
|
* PLLD is the display PLL, used to drive DSI display panels.
|
|
*
|
|
* It is in the PX LDO power domain, which is on when the AUDIO domain
|
|
* is on.
|
|
*/
|
|
static const struct bcm2835_pll_data bcm2835_plld_data = {
|
|
.name = "plld",
|
|
.cm_ctrl_reg = CM_PLLD,
|
|
.a2w_ctrl_reg = A2W_PLLD_CTRL,
|
|
.frac_reg = A2W_PLLD_FRAC,
|
|
.ana_reg_base = A2W_PLLD_ANA0,
|
|
.reference_enable_mask = A2W_XOSC_CTRL_DDR_ENABLE,
|
|
.lock_mask = CM_LOCK_FLOCKD,
|
|
|
|
.ana = &bcm2835_ana_default,
|
|
|
|
.min_rate = 600000000u,
|
|
.max_rate = 2400000000u,
|
|
.max_fb_rate = BCM2835_MAX_FB_RATE,
|
|
};
|
|
|
|
/*
|
|
* PLLH is used to supply the pixel clock or the AUX clock for the TV
|
|
* encoder.
|
|
*
|
|
* It is in the HDMI power domain.
|
|
*/
|
|
static const struct bcm2835_pll_data bcm2835_pllh_data = {
|
|
"pllh",
|
|
.cm_ctrl_reg = CM_PLLH,
|
|
.a2w_ctrl_reg = A2W_PLLH_CTRL,
|
|
.frac_reg = A2W_PLLH_FRAC,
|
|
.ana_reg_base = A2W_PLLH_ANA0,
|
|
.reference_enable_mask = A2W_XOSC_CTRL_PLLC_ENABLE,
|
|
.lock_mask = CM_LOCK_FLOCKH,
|
|
|
|
.ana = &bcm2835_ana_pllh,
|
|
|
|
.min_rate = 600000000u,
|
|
.max_rate = 3000000000u,
|
|
.max_fb_rate = BCM2835_MAX_FB_RATE,
|
|
};
|
|
|
|
struct bcm2835_pll_divider_data {
|
|
const char *name;
|
|
const struct bcm2835_pll_data *source_pll;
|
|
u32 cm_reg;
|
|
u32 a2w_reg;
|
|
|
|
u32 load_mask;
|
|
u32 hold_mask;
|
|
u32 fixed_divider;
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_plla_core_data = {
|
|
.name = "plla_core",
|
|
.source_pll = &bcm2835_plla_data,
|
|
.cm_reg = CM_PLLA,
|
|
.a2w_reg = A2W_PLLA_CORE,
|
|
.load_mask = CM_PLLA_LOADCORE,
|
|
.hold_mask = CM_PLLA_HOLDCORE,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_plla_per_data = {
|
|
.name = "plla_per",
|
|
.source_pll = &bcm2835_plla_data,
|
|
.cm_reg = CM_PLLA,
|
|
.a2w_reg = A2W_PLLA_PER,
|
|
.load_mask = CM_PLLA_LOADPER,
|
|
.hold_mask = CM_PLLA_HOLDPER,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllb_arm_data = {
|
|
.name = "pllb_arm",
|
|
.source_pll = &bcm2835_pllb_data,
|
|
.cm_reg = CM_PLLB,
|
|
.a2w_reg = A2W_PLLB_ARM,
|
|
.load_mask = CM_PLLB_LOADARM,
|
|
.hold_mask = CM_PLLB_HOLDARM,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllc_core0_data = {
|
|
.name = "pllc_core0",
|
|
.source_pll = &bcm2835_pllc_data,
|
|
.cm_reg = CM_PLLC,
|
|
.a2w_reg = A2W_PLLC_CORE0,
|
|
.load_mask = CM_PLLC_LOADCORE0,
|
|
.hold_mask = CM_PLLC_HOLDCORE0,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllc_core1_data = {
|
|
.name = "pllc_core1", .source_pll = &bcm2835_pllc_data,
|
|
.cm_reg = CM_PLLC, A2W_PLLC_CORE1,
|
|
.load_mask = CM_PLLC_LOADCORE1,
|
|
.hold_mask = CM_PLLC_HOLDCORE1,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllc_core2_data = {
|
|
.name = "pllc_core2",
|
|
.source_pll = &bcm2835_pllc_data,
|
|
.cm_reg = CM_PLLC,
|
|
.a2w_reg = A2W_PLLC_CORE2,
|
|
.load_mask = CM_PLLC_LOADCORE2,
|
|
.hold_mask = CM_PLLC_HOLDCORE2,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllc_per_data = {
|
|
.name = "pllc_per",
|
|
.source_pll = &bcm2835_pllc_data,
|
|
.cm_reg = CM_PLLC,
|
|
.a2w_reg = A2W_PLLC_PER,
|
|
.load_mask = CM_PLLC_LOADPER,
|
|
.hold_mask = CM_PLLC_HOLDPER,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_plld_core_data = {
|
|
.name = "plld_core",
|
|
.source_pll = &bcm2835_plld_data,
|
|
.cm_reg = CM_PLLD,
|
|
.a2w_reg = A2W_PLLD_CORE,
|
|
.load_mask = CM_PLLD_LOADCORE,
|
|
.hold_mask = CM_PLLD_HOLDCORE,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_plld_per_data = {
|
|
.name = "plld_per",
|
|
.source_pll = &bcm2835_plld_data,
|
|
.cm_reg = CM_PLLD,
|
|
.a2w_reg = A2W_PLLD_PER,
|
|
.load_mask = CM_PLLD_LOADPER,
|
|
.hold_mask = CM_PLLD_HOLDPER,
|
|
.fixed_divider = 1,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllh_rcal_data = {
|
|
.name = "pllh_rcal",
|
|
.source_pll = &bcm2835_pllh_data,
|
|
.cm_reg = CM_PLLH,
|
|
.a2w_reg = A2W_PLLH_RCAL,
|
|
.load_mask = CM_PLLH_LOADRCAL,
|
|
.hold_mask = 0,
|
|
.fixed_divider = 10,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllh_aux_data = {
|
|
.name = "pllh_aux",
|
|
.source_pll = &bcm2835_pllh_data,
|
|
.cm_reg = CM_PLLH,
|
|
.a2w_reg = A2W_PLLH_AUX,
|
|
.load_mask = CM_PLLH_LOADAUX,
|
|
.hold_mask = 0,
|
|
.fixed_divider = 10,
|
|
};
|
|
|
|
static const struct bcm2835_pll_divider_data bcm2835_pllh_pix_data = {
|
|
.name = "pllh_pix",
|
|
.source_pll = &bcm2835_pllh_data,
|
|
.cm_reg = CM_PLLH,
|
|
.a2w_reg = A2W_PLLH_PIX,
|
|
.load_mask = CM_PLLH_LOADPIX,
|
|
.hold_mask = 0,
|
|
.fixed_divider = 10,
|
|
};
|
|
|
|
struct bcm2835_clock_data {
|
|
const char *name;
|
|
|
|
const char *const *parents;
|
|
int num_mux_parents;
|
|
|
|
u32 ctl_reg;
|
|
u32 div_reg;
|
|
|
|
/* Number of integer bits in the divider */
|
|
u32 int_bits;
|
|
/* Number of fractional bits in the divider */
|
|
u32 frac_bits;
|
|
|
|
bool is_vpu_clock;
|
|
};
|
|
|
|
static const char *const bcm2835_clock_per_parents[] = {
|
|
"gnd",
|
|
"xosc",
|
|
"testdebug0",
|
|
"testdebug1",
|
|
"plla_per",
|
|
"pllc_per",
|
|
"plld_per",
|
|
"pllh_aux",
|
|
};
|
|
|
|
static const char *const bcm2835_clock_vpu_parents[] = {
|
|
"gnd",
|
|
"xosc",
|
|
"testdebug0",
|
|
"testdebug1",
|
|
"plla_core",
|
|
"pllc_core0",
|
|
"plld_core",
|
|
"pllh_aux",
|
|
"pllc_core1",
|
|
"pllc_core2",
|
|
};
|
|
|
|
static const char *const bcm2835_clock_osc_parents[] = {
|
|
"gnd",
|
|
"xosc",
|
|
"testdebug0",
|
|
"testdebug1"
|
|
};
|
|
|
|
/*
|
|
* Used for a 1Mhz clock for the system clocksource, and also used by
|
|
* the watchdog timer and the camera pulse generator.
|
|
*/
|
|
static const struct bcm2835_clock_data bcm2835_clock_timer_data = {
|
|
.name = "timer",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_osc_parents),
|
|
.parents = bcm2835_clock_osc_parents,
|
|
.ctl_reg = CM_TIMERCTL,
|
|
.div_reg = CM_TIMERDIV,
|
|
.int_bits = 6,
|
|
.frac_bits = 12,
|
|
};
|
|
|
|
/* One Time Programmable Memory clock. Maximum 10Mhz. */
|
|
static const struct bcm2835_clock_data bcm2835_clock_otp_data = {
|
|
.name = "otp",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_osc_parents),
|
|
.parents = bcm2835_clock_osc_parents,
|
|
.ctl_reg = CM_OTPCTL,
|
|
.div_reg = CM_OTPDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 0,
|
|
};
|
|
|
|
/*
|
|
* VPU clock. This doesn't have an enable bit, since it drives the
|
|
* bus for everything else, and is special so it doesn't need to be
|
|
* gated for rate changes. It is also known as "clk_audio" in various
|
|
* hardware documentation.
|
|
*/
|
|
static const struct bcm2835_clock_data bcm2835_clock_vpu_data = {
|
|
.name = "vpu",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents),
|
|
.parents = bcm2835_clock_vpu_parents,
|
|
.ctl_reg = CM_VPUCTL,
|
|
.div_reg = CM_VPUDIV,
|
|
.int_bits = 12,
|
|
.frac_bits = 8,
|
|
.is_vpu_clock = true,
|
|
};
|
|
|
|
static const struct bcm2835_clock_data bcm2835_clock_v3d_data = {
|
|
.name = "v3d",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents),
|
|
.parents = bcm2835_clock_vpu_parents,
|
|
.ctl_reg = CM_V3DCTL,
|
|
.div_reg = CM_V3DDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 8,
|
|
};
|
|
|
|
static const struct bcm2835_clock_data bcm2835_clock_isp_data = {
|
|
.name = "isp",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents),
|
|
.parents = bcm2835_clock_vpu_parents,
|
|
.ctl_reg = CM_ISPCTL,
|
|
.div_reg = CM_ISPDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 8,
|
|
};
|
|
|
|
static const struct bcm2835_clock_data bcm2835_clock_h264_data = {
|
|
.name = "h264",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents),
|
|
.parents = bcm2835_clock_vpu_parents,
|
|
.ctl_reg = CM_H264CTL,
|
|
.div_reg = CM_H264DIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 8,
|
|
};
|
|
|
|
/* TV encoder clock. Only operating frequency is 108Mhz. */
|
|
static const struct bcm2835_clock_data bcm2835_clock_vec_data = {
|
|
.name = "vec",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents),
|
|
.parents = bcm2835_clock_per_parents,
|
|
.ctl_reg = CM_VECCTL,
|
|
.div_reg = CM_VECDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 0,
|
|
};
|
|
|
|
static const struct bcm2835_clock_data bcm2835_clock_uart_data = {
|
|
.name = "uart",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents),
|
|
.parents = bcm2835_clock_per_parents,
|
|
.ctl_reg = CM_UARTCTL,
|
|
.div_reg = CM_UARTDIV,
|
|
.int_bits = 10,
|
|
.frac_bits = 12,
|
|
};
|
|
|
|
/* HDMI state machine */
|
|
static const struct bcm2835_clock_data bcm2835_clock_hsm_data = {
|
|
.name = "hsm",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents),
|
|
.parents = bcm2835_clock_per_parents,
|
|
.ctl_reg = CM_HSMCTL,
|
|
.div_reg = CM_HSMDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 8,
|
|
};
|
|
|
|
/*
|
|
* Secondary SDRAM clock. Used for low-voltage modes when the PLL in
|
|
* the SDRAM controller can't be used.
|
|
*/
|
|
static const struct bcm2835_clock_data bcm2835_clock_sdram_data = {
|
|
.name = "sdram",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents),
|
|
.parents = bcm2835_clock_vpu_parents,
|
|
.ctl_reg = CM_SDCCTL,
|
|
.div_reg = CM_SDCDIV,
|
|
.int_bits = 6,
|
|
.frac_bits = 0,
|
|
};
|
|
|
|
/* Clock for the temperature sensor. Generally run at 2Mhz, max 5Mhz. */
|
|
static const struct bcm2835_clock_data bcm2835_clock_tsens_data = {
|
|
.name = "tsens",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_osc_parents),
|
|
.parents = bcm2835_clock_osc_parents,
|
|
.ctl_reg = CM_TSENSCTL,
|
|
.div_reg = CM_TSENSDIV,
|
|
.int_bits = 5,
|
|
.frac_bits = 0,
|
|
};
|
|
|
|
/* Arasan EMMC clock */
|
|
static const struct bcm2835_clock_data bcm2835_clock_emmc_data = {
|
|
.name = "emmc",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents),
|
|
.parents = bcm2835_clock_per_parents,
|
|
.ctl_reg = CM_EMMCCTL,
|
|
.div_reg = CM_EMMCDIV,
|
|
.int_bits = 4,
|
|
.frac_bits = 8,
|
|
};
|
|
|
|
static const struct bcm2835_clock_data bcm2835_clock_pwm_data = {
|
|
.name = "pwm",
|
|
.num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents),
|
|
.parents = bcm2835_clock_per_parents,
|
|
.ctl_reg = CM_PWMCTL,
|
|
.div_reg = CM_PWMDIV,
|
|
.int_bits = 12,
|
|
.frac_bits = 12,
|
|
};
|
|
|
|
struct bcm2835_pll {
|
|
struct clk_hw hw;
|
|
struct bcm2835_cprman *cprman;
|
|
const struct bcm2835_pll_data *data;
|
|
};
|
|
|
|
static int bcm2835_pll_is_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
|
|
struct bcm2835_cprman *cprman = pll->cprman;
|
|
const struct bcm2835_pll_data *data = pll->data;
|
|
|
|
return cprman_read(cprman, data->a2w_ctrl_reg) &
|
|
A2W_PLL_CTRL_PRST_DISABLE;
|
|
}
|
|
|
|
static void bcm2835_pll_choose_ndiv_and_fdiv(unsigned long rate,
|
|
unsigned long parent_rate,
|
|
u32 *ndiv, u32 *fdiv)
|
|
{
|
|
u64 div;
|
|
|
|
div = (u64)rate << A2W_PLL_FRAC_BITS;
|
|
do_div(div, parent_rate);
|
|
|
|
*ndiv = div >> A2W_PLL_FRAC_BITS;
|
|
*fdiv = div & ((1 << A2W_PLL_FRAC_BITS) - 1);
|
|
}
|
|
|
|
static long bcm2835_pll_rate_from_divisors(unsigned long parent_rate,
|
|
u32 ndiv, u32 fdiv, u32 pdiv)
|
|
{
|
|
u64 rate;
|
|
|
|
if (pdiv == 0)
|
|
return 0;
|
|
|
|
rate = (u64)parent_rate * ((ndiv << A2W_PLL_FRAC_BITS) + fdiv);
|
|
do_div(rate, pdiv);
|
|
return rate >> A2W_PLL_FRAC_BITS;
|
|
}
|
|
|
|
static long bcm2835_pll_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
u32 ndiv, fdiv;
|
|
|
|
bcm2835_pll_choose_ndiv_and_fdiv(rate, *parent_rate, &ndiv, &fdiv);
|
|
|
|
return bcm2835_pll_rate_from_divisors(*parent_rate, ndiv, fdiv, 1);
|
|
}
|
|
|
|
static unsigned long bcm2835_pll_get_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
|
|
struct bcm2835_cprman *cprman = pll->cprman;
|
|
const struct bcm2835_pll_data *data = pll->data;
|
|
u32 a2wctrl = cprman_read(cprman, data->a2w_ctrl_reg);
|
|
u32 ndiv, pdiv, fdiv;
|
|
bool using_prediv;
|
|
|
|
if (parent_rate == 0)
|
|
return 0;
|
|
|
|
fdiv = cprman_read(cprman, data->frac_reg) & A2W_PLL_FRAC_MASK;
|
|
ndiv = (a2wctrl & A2W_PLL_CTRL_NDIV_MASK) >> A2W_PLL_CTRL_NDIV_SHIFT;
|
|
pdiv = (a2wctrl & A2W_PLL_CTRL_PDIV_MASK) >> A2W_PLL_CTRL_PDIV_SHIFT;
|
|
using_prediv = cprman_read(cprman, data->ana_reg_base + 4) &
|
|
data->ana->fb_prediv_mask;
|
|
|
|
if (using_prediv)
|
|
ndiv *= 2;
|
|
|
|
return bcm2835_pll_rate_from_divisors(parent_rate, ndiv, fdiv, pdiv);
|
|
}
|
|
|
|
static void bcm2835_pll_off(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
|
|
struct bcm2835_cprman *cprman = pll->cprman;
|
|
const struct bcm2835_pll_data *data = pll->data;
|
|
|
|
cprman_write(cprman, data->cm_ctrl_reg, CM_PLL_ANARST);
|
|
cprman_write(cprman, data->a2w_ctrl_reg, A2W_PLL_CTRL_PWRDN);
|
|
}
|
|
|
|
static int bcm2835_pll_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
|
|
struct bcm2835_cprman *cprman = pll->cprman;
|
|
const struct bcm2835_pll_data *data = pll->data;
|
|
ktime_t timeout;
|
|
|
|
/* Take the PLL out of reset. */
|
|
cprman_write(cprman, data->cm_ctrl_reg,
|
|
cprman_read(cprman, data->cm_ctrl_reg) & ~CM_PLL_ANARST);
|
|
|
|
/* Wait for the PLL to lock. */
|
|
timeout = ktime_add_ns(ktime_get(), LOCK_TIMEOUT_NS);
|
|
while (!(cprman_read(cprman, CM_LOCK) & data->lock_mask)) {
|
|
if (ktime_after(ktime_get(), timeout)) {
|
|
dev_err(cprman->dev, "%s: couldn't lock PLL\n",
|
|
clk_hw_get_name(hw));
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
cpu_relax();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
bcm2835_pll_write_ana(struct bcm2835_cprman *cprman, u32 ana_reg_base, u32 *ana)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* ANA register setup is done as a series of writes to
|
|
* ANA3-ANA0, in that order. This lets us write all 4
|
|
* registers as a single cycle of the serdes interface (taking
|
|
* 100 xosc clocks), whereas if we were to update ana0, 1, and
|
|
* 3 individually through their partial-write registers, each
|
|
* would be their own serdes cycle.
|
|
*/
|
|
for (i = 3; i >= 0; i--)
|
|
cprman_write(cprman, ana_reg_base + i * 4, ana[i]);
|
|
}
|
|
|
|
static int bcm2835_pll_set_rate(struct clk_hw *hw,
|
|
unsigned long rate, unsigned long parent_rate)
|
|
{
|
|
struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
|
|
struct bcm2835_cprman *cprman = pll->cprman;
|
|
const struct bcm2835_pll_data *data = pll->data;
|
|
bool was_using_prediv, use_fb_prediv, do_ana_setup_first;
|
|
u32 ndiv, fdiv, a2w_ctl;
|
|
u32 ana[4];
|
|
int i;
|
|
|
|
if (rate < data->min_rate || rate > data->max_rate) {
|
|
dev_err(cprman->dev, "%s: rate out of spec: %lu vs (%lu, %lu)\n",
|
|
clk_hw_get_name(hw), rate,
|
|
data->min_rate, data->max_rate);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (rate > data->max_fb_rate) {
|
|
use_fb_prediv = true;
|
|
rate /= 2;
|
|
} else {
|
|
use_fb_prediv = false;
|
|
}
|
|
|
|
bcm2835_pll_choose_ndiv_and_fdiv(rate, parent_rate, &ndiv, &fdiv);
|
|
|
|
for (i = 3; i >= 0; i--)
|
|
ana[i] = cprman_read(cprman, data->ana_reg_base + i * 4);
|
|
|
|
was_using_prediv = ana[1] & data->ana->fb_prediv_mask;
|
|
|
|
ana[0] &= ~data->ana->mask0;
|
|
ana[0] |= data->ana->set0;
|
|
ana[1] &= ~data->ana->mask1;
|
|
ana[1] |= data->ana->set1;
|
|
ana[3] &= ~data->ana->mask3;
|
|
ana[3] |= data->ana->set3;
|
|
|
|
if (was_using_prediv && !use_fb_prediv) {
|
|
ana[1] &= ~data->ana->fb_prediv_mask;
|
|
do_ana_setup_first = true;
|
|
} else if (!was_using_prediv && use_fb_prediv) {
|
|
ana[1] |= data->ana->fb_prediv_mask;
|
|
do_ana_setup_first = false;
|
|
} else {
|
|
do_ana_setup_first = true;
|
|
}
|
|
|
|
/* Unmask the reference clock from the oscillator. */
|
|
cprman_write(cprman, A2W_XOSC_CTRL,
|
|
cprman_read(cprman, A2W_XOSC_CTRL) |
|
|
data->reference_enable_mask);
|
|
|
|
if (do_ana_setup_first)
|
|
bcm2835_pll_write_ana(cprman, data->ana_reg_base, ana);
|
|
|
|
/* Set the PLL multiplier from the oscillator. */
|
|
cprman_write(cprman, data->frac_reg, fdiv);
|
|
|
|
a2w_ctl = cprman_read(cprman, data->a2w_ctrl_reg);
|
|
a2w_ctl &= ~A2W_PLL_CTRL_NDIV_MASK;
|
|
a2w_ctl |= ndiv << A2W_PLL_CTRL_NDIV_SHIFT;
|
|
a2w_ctl &= ~A2W_PLL_CTRL_PDIV_MASK;
|
|
a2w_ctl |= 1 << A2W_PLL_CTRL_PDIV_SHIFT;
|
|
cprman_write(cprman, data->a2w_ctrl_reg, a2w_ctl);
|
|
|
|
if (!do_ana_setup_first)
|
|
bcm2835_pll_write_ana(cprman, data->ana_reg_base, ana);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops bcm2835_pll_clk_ops = {
|
|
.is_prepared = bcm2835_pll_is_on,
|
|
.prepare = bcm2835_pll_on,
|
|
.unprepare = bcm2835_pll_off,
|
|
.recalc_rate = bcm2835_pll_get_rate,
|
|
.set_rate = bcm2835_pll_set_rate,
|
|
.round_rate = bcm2835_pll_round_rate,
|
|
};
|
|
|
|
struct bcm2835_pll_divider {
|
|
struct clk_divider div;
|
|
struct bcm2835_cprman *cprman;
|
|
const struct bcm2835_pll_divider_data *data;
|
|
};
|
|
|
|
static struct bcm2835_pll_divider *
|
|
bcm2835_pll_divider_from_hw(struct clk_hw *hw)
|
|
{
|
|
return container_of(hw, struct bcm2835_pll_divider, div.hw);
|
|
}
|
|
|
|
static int bcm2835_pll_divider_is_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll_divider *divider = bcm2835_pll_divider_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = divider->cprman;
|
|
const struct bcm2835_pll_divider_data *data = divider->data;
|
|
|
|
return !(cprman_read(cprman, data->a2w_reg) & A2W_PLL_CHANNEL_DISABLE);
|
|
}
|
|
|
|
static long bcm2835_pll_divider_round_rate(struct clk_hw *hw,
|
|
unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
return clk_divider_ops.round_rate(hw, rate, parent_rate);
|
|
}
|
|
|
|
static unsigned long bcm2835_pll_divider_get_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
return clk_divider_ops.recalc_rate(hw, parent_rate);
|
|
}
|
|
|
|
static void bcm2835_pll_divider_off(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll_divider *divider = bcm2835_pll_divider_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = divider->cprman;
|
|
const struct bcm2835_pll_divider_data *data = divider->data;
|
|
|
|
cprman_write(cprman, data->cm_reg,
|
|
(cprman_read(cprman, data->cm_reg) &
|
|
~data->load_mask) | data->hold_mask);
|
|
cprman_write(cprman, data->a2w_reg, A2W_PLL_CHANNEL_DISABLE);
|
|
}
|
|
|
|
static int bcm2835_pll_divider_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_pll_divider *divider = bcm2835_pll_divider_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = divider->cprman;
|
|
const struct bcm2835_pll_divider_data *data = divider->data;
|
|
|
|
cprman_write(cprman, data->a2w_reg,
|
|
cprman_read(cprman, data->a2w_reg) &
|
|
~A2W_PLL_CHANNEL_DISABLE);
|
|
|
|
cprman_write(cprman, data->cm_reg,
|
|
cprman_read(cprman, data->cm_reg) & ~data->hold_mask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_pll_divider_set_rate(struct clk_hw *hw,
|
|
unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct bcm2835_pll_divider *divider = bcm2835_pll_divider_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = divider->cprman;
|
|
const struct bcm2835_pll_divider_data *data = divider->data;
|
|
u32 cm, div, max_div = 1 << A2W_PLL_DIV_BITS;
|
|
|
|
div = DIV_ROUND_UP_ULL(parent_rate, rate);
|
|
|
|
div = min(div, max_div);
|
|
if (div == max_div)
|
|
div = 0;
|
|
|
|
cprman_write(cprman, data->a2w_reg, div);
|
|
cm = cprman_read(cprman, data->cm_reg);
|
|
cprman_write(cprman, data->cm_reg, cm | data->load_mask);
|
|
cprman_write(cprman, data->cm_reg, cm & ~data->load_mask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops bcm2835_pll_divider_clk_ops = {
|
|
.is_prepared = bcm2835_pll_divider_is_on,
|
|
.prepare = bcm2835_pll_divider_on,
|
|
.unprepare = bcm2835_pll_divider_off,
|
|
.recalc_rate = bcm2835_pll_divider_get_rate,
|
|
.set_rate = bcm2835_pll_divider_set_rate,
|
|
.round_rate = bcm2835_pll_divider_round_rate,
|
|
};
|
|
|
|
/*
|
|
* The CM dividers do fixed-point division, so we can't use the
|
|
* generic integer divider code like the PLL dividers do (and we can't
|
|
* fake it by having some fixed shifts preceding it in the clock tree,
|
|
* because we'd run out of bits in a 32-bit unsigned long).
|
|
*/
|
|
struct bcm2835_clock {
|
|
struct clk_hw hw;
|
|
struct bcm2835_cprman *cprman;
|
|
const struct bcm2835_clock_data *data;
|
|
};
|
|
|
|
static struct bcm2835_clock *bcm2835_clock_from_hw(struct clk_hw *hw)
|
|
{
|
|
return container_of(hw, struct bcm2835_clock, hw);
|
|
}
|
|
|
|
static int bcm2835_clock_is_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
|
|
return (cprman_read(cprman, data->ctl_reg) & CM_ENABLE) != 0;
|
|
}
|
|
|
|
static u32 bcm2835_clock_choose_div(struct clk_hw *hw,
|
|
unsigned long rate,
|
|
unsigned long parent_rate,
|
|
bool round_up)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u32 unused_frac_mask =
|
|
GENMASK(CM_DIV_FRAC_BITS - data->frac_bits, 0) >> 1;
|
|
u64 temp = (u64)parent_rate << CM_DIV_FRAC_BITS;
|
|
u64 rem;
|
|
u32 div;
|
|
|
|
rem = do_div(temp, rate);
|
|
div = temp;
|
|
|
|
/* Round up and mask off the unused bits */
|
|
if (round_up && ((div & unused_frac_mask) != 0 || rem != 0))
|
|
div += unused_frac_mask + 1;
|
|
div &= ~unused_frac_mask;
|
|
|
|
/* Clamp to the limits. */
|
|
div = max(div, unused_frac_mask + 1);
|
|
div = min_t(u32, div, GENMASK(data->int_bits + CM_DIV_FRAC_BITS - 1,
|
|
CM_DIV_FRAC_BITS - data->frac_bits));
|
|
|
|
return div;
|
|
}
|
|
|
|
static long bcm2835_clock_rate_from_divisor(struct bcm2835_clock *clock,
|
|
unsigned long parent_rate,
|
|
u32 div)
|
|
{
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u64 temp;
|
|
|
|
/*
|
|
* The divisor is a 12.12 fixed point field, but only some of
|
|
* the bits are populated in any given clock.
|
|
*/
|
|
div >>= CM_DIV_FRAC_BITS - data->frac_bits;
|
|
div &= (1 << (data->int_bits + data->frac_bits)) - 1;
|
|
|
|
if (div == 0)
|
|
return 0;
|
|
|
|
temp = (u64)parent_rate << data->frac_bits;
|
|
|
|
do_div(temp, div);
|
|
|
|
return temp;
|
|
}
|
|
|
|
static unsigned long bcm2835_clock_get_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u32 div = cprman_read(cprman, data->div_reg);
|
|
|
|
return bcm2835_clock_rate_from_divisor(clock, parent_rate, div);
|
|
}
|
|
|
|
static void bcm2835_clock_wait_busy(struct bcm2835_clock *clock)
|
|
{
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
ktime_t timeout = ktime_add_ns(ktime_get(), LOCK_TIMEOUT_NS);
|
|
|
|
while (cprman_read(cprman, data->ctl_reg) & CM_BUSY) {
|
|
if (ktime_after(ktime_get(), timeout)) {
|
|
dev_err(cprman->dev, "%s: couldn't lock PLL\n",
|
|
clk_hw_get_name(&clock->hw));
|
|
return;
|
|
}
|
|
cpu_relax();
|
|
}
|
|
}
|
|
|
|
static void bcm2835_clock_off(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
|
|
spin_lock(&cprman->regs_lock);
|
|
cprman_write(cprman, data->ctl_reg,
|
|
cprman_read(cprman, data->ctl_reg) & ~CM_ENABLE);
|
|
spin_unlock(&cprman->regs_lock);
|
|
|
|
/* BUSY will remain high until the divider completes its cycle. */
|
|
bcm2835_clock_wait_busy(clock);
|
|
}
|
|
|
|
static int bcm2835_clock_on(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
|
|
spin_lock(&cprman->regs_lock);
|
|
cprman_write(cprman, data->ctl_reg,
|
|
cprman_read(cprman, data->ctl_reg) |
|
|
CM_ENABLE |
|
|
CM_GATE);
|
|
spin_unlock(&cprman->regs_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_clock_set_rate(struct clk_hw *hw,
|
|
unsigned long rate, unsigned long parent_rate)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u32 div = bcm2835_clock_choose_div(hw, rate, parent_rate, false);
|
|
|
|
cprman_write(cprman, data->div_reg, div);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_clock_determine_rate(struct clk_hw *hw,
|
|
struct clk_rate_request *req)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct clk_hw *parent, *best_parent = NULL;
|
|
unsigned long rate, best_rate = 0;
|
|
unsigned long prate, best_prate = 0;
|
|
size_t i;
|
|
u32 div;
|
|
|
|
/*
|
|
* Select parent clock that results in the closest but lower rate
|
|
*/
|
|
for (i = 0; i < clk_hw_get_num_parents(hw); ++i) {
|
|
parent = clk_hw_get_parent_by_index(hw, i);
|
|
if (!parent)
|
|
continue;
|
|
prate = clk_hw_get_rate(parent);
|
|
div = bcm2835_clock_choose_div(hw, req->rate, prate, true);
|
|
rate = bcm2835_clock_rate_from_divisor(clock, prate, div);
|
|
if (rate > best_rate && rate <= req->rate) {
|
|
best_parent = parent;
|
|
best_prate = prate;
|
|
best_rate = rate;
|
|
}
|
|
}
|
|
|
|
if (!best_parent)
|
|
return -EINVAL;
|
|
|
|
req->best_parent_hw = best_parent;
|
|
req->best_parent_rate = best_prate;
|
|
|
|
req->rate = best_rate;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_clock_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u8 src = (index << CM_SRC_SHIFT) & CM_SRC_MASK;
|
|
|
|
cprman_write(cprman, data->ctl_reg, src);
|
|
return 0;
|
|
}
|
|
|
|
static u8 bcm2835_clock_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
|
|
struct bcm2835_cprman *cprman = clock->cprman;
|
|
const struct bcm2835_clock_data *data = clock->data;
|
|
u32 src = cprman_read(cprman, data->ctl_reg);
|
|
|
|
return (src & CM_SRC_MASK) >> CM_SRC_SHIFT;
|
|
}
|
|
|
|
|
|
static const struct clk_ops bcm2835_clock_clk_ops = {
|
|
.is_prepared = bcm2835_clock_is_on,
|
|
.prepare = bcm2835_clock_on,
|
|
.unprepare = bcm2835_clock_off,
|
|
.recalc_rate = bcm2835_clock_get_rate,
|
|
.set_rate = bcm2835_clock_set_rate,
|
|
.determine_rate = bcm2835_clock_determine_rate,
|
|
.set_parent = bcm2835_clock_set_parent,
|
|
.get_parent = bcm2835_clock_get_parent,
|
|
};
|
|
|
|
static int bcm2835_vpu_clock_is_on(struct clk_hw *hw)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* The VPU clock can never be disabled (it doesn't have an ENABLE
|
|
* bit), so it gets its own set of clock ops.
|
|
*/
|
|
static const struct clk_ops bcm2835_vpu_clock_clk_ops = {
|
|
.is_prepared = bcm2835_vpu_clock_is_on,
|
|
.recalc_rate = bcm2835_clock_get_rate,
|
|
.set_rate = bcm2835_clock_set_rate,
|
|
.determine_rate = bcm2835_clock_determine_rate,
|
|
.set_parent = bcm2835_clock_set_parent,
|
|
.get_parent = bcm2835_clock_get_parent,
|
|
};
|
|
|
|
static struct clk *bcm2835_register_pll(struct bcm2835_cprman *cprman,
|
|
const struct bcm2835_pll_data *data)
|
|
{
|
|
struct bcm2835_pll *pll;
|
|
struct clk_init_data init;
|
|
|
|
memset(&init, 0, sizeof(init));
|
|
|
|
/* All of the PLLs derive from the external oscillator. */
|
|
init.parent_names = &cprman->osc_name;
|
|
init.num_parents = 1;
|
|
init.name = data->name;
|
|
init.ops = &bcm2835_pll_clk_ops;
|
|
init.flags = CLK_IGNORE_UNUSED;
|
|
|
|
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
|
|
if (!pll)
|
|
return NULL;
|
|
|
|
pll->cprman = cprman;
|
|
pll->data = data;
|
|
pll->hw.init = &init;
|
|
|
|
return devm_clk_register(cprman->dev, &pll->hw);
|
|
}
|
|
|
|
static struct clk *
|
|
bcm2835_register_pll_divider(struct bcm2835_cprman *cprman,
|
|
const struct bcm2835_pll_divider_data *data)
|
|
{
|
|
struct bcm2835_pll_divider *divider;
|
|
struct clk_init_data init;
|
|
struct clk *clk;
|
|
const char *divider_name;
|
|
|
|
if (data->fixed_divider != 1) {
|
|
divider_name = devm_kasprintf(cprman->dev, GFP_KERNEL,
|
|
"%s_prediv", data->name);
|
|
if (!divider_name)
|
|
return NULL;
|
|
} else {
|
|
divider_name = data->name;
|
|
}
|
|
|
|
memset(&init, 0, sizeof(init));
|
|
|
|
init.parent_names = &data->source_pll->name;
|
|
init.num_parents = 1;
|
|
init.name = divider_name;
|
|
init.ops = &bcm2835_pll_divider_clk_ops;
|
|
init.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED;
|
|
|
|
divider = devm_kzalloc(cprman->dev, sizeof(*divider), GFP_KERNEL);
|
|
if (!divider)
|
|
return NULL;
|
|
|
|
divider->div.reg = cprman->regs + data->a2w_reg;
|
|
divider->div.shift = A2W_PLL_DIV_SHIFT;
|
|
divider->div.width = A2W_PLL_DIV_BITS;
|
|
divider->div.flags = CLK_DIVIDER_MAX_AT_ZERO;
|
|
divider->div.lock = &cprman->regs_lock;
|
|
divider->div.hw.init = &init;
|
|
divider->div.table = NULL;
|
|
|
|
divider->cprman = cprman;
|
|
divider->data = data;
|
|
|
|
clk = devm_clk_register(cprman->dev, ÷r->div.hw);
|
|
if (IS_ERR(clk))
|
|
return clk;
|
|
|
|
/*
|
|
* PLLH's channels have a fixed divide by 10 afterwards, which
|
|
* is what our consumers are actually using.
|
|
*/
|
|
if (data->fixed_divider != 1) {
|
|
return clk_register_fixed_factor(cprman->dev, data->name,
|
|
divider_name,
|
|
CLK_SET_RATE_PARENT,
|
|
1,
|
|
data->fixed_divider);
|
|
}
|
|
|
|
return clk;
|
|
}
|
|
|
|
static struct clk *bcm2835_register_clock(struct bcm2835_cprman *cprman,
|
|
const struct bcm2835_clock_data *data)
|
|
{
|
|
struct bcm2835_clock *clock;
|
|
struct clk_init_data init;
|
|
const char *parents[1 << CM_SRC_BITS];
|
|
size_t i;
|
|
|
|
/*
|
|
* Replace our "xosc" references with the oscillator's
|
|
* actual name.
|
|
*/
|
|
for (i = 0; i < data->num_mux_parents; i++) {
|
|
if (strcmp(data->parents[i], "xosc") == 0)
|
|
parents[i] = cprman->osc_name;
|
|
else
|
|
parents[i] = data->parents[i];
|
|
}
|
|
|
|
memset(&init, 0, sizeof(init));
|
|
init.parent_names = parents;
|
|
init.num_parents = data->num_mux_parents;
|
|
init.name = data->name;
|
|
init.flags = CLK_IGNORE_UNUSED;
|
|
|
|
if (data->is_vpu_clock) {
|
|
init.ops = &bcm2835_vpu_clock_clk_ops;
|
|
} else {
|
|
init.ops = &bcm2835_clock_clk_ops;
|
|
init.flags |= CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
|
|
}
|
|
|
|
clock = devm_kzalloc(cprman->dev, sizeof(*clock), GFP_KERNEL);
|
|
if (!clock)
|
|
return NULL;
|
|
|
|
clock->cprman = cprman;
|
|
clock->data = data;
|
|
clock->hw.init = &init;
|
|
|
|
return devm_clk_register(cprman->dev, &clock->hw);
|
|
}
|
|
|
|
static int bcm2835_clk_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct clk **clks;
|
|
struct bcm2835_cprman *cprman;
|
|
struct resource *res;
|
|
|
|
cprman = devm_kzalloc(dev, sizeof(*cprman), GFP_KERNEL);
|
|
if (!cprman)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&cprman->regs_lock);
|
|
cprman->dev = dev;
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
cprman->regs = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(cprman->regs))
|
|
return PTR_ERR(cprman->regs);
|
|
|
|
cprman->osc_name = of_clk_get_parent_name(dev->of_node, 0);
|
|
if (!cprman->osc_name)
|
|
return -ENODEV;
|
|
|
|
platform_set_drvdata(pdev, cprman);
|
|
|
|
cprman->onecell.clk_num = BCM2835_CLOCK_COUNT;
|
|
cprman->onecell.clks = cprman->clks;
|
|
clks = cprman->clks;
|
|
|
|
clks[BCM2835_PLLA] = bcm2835_register_pll(cprman, &bcm2835_plla_data);
|
|
clks[BCM2835_PLLB] = bcm2835_register_pll(cprman, &bcm2835_pllb_data);
|
|
clks[BCM2835_PLLC] = bcm2835_register_pll(cprman, &bcm2835_pllc_data);
|
|
clks[BCM2835_PLLD] = bcm2835_register_pll(cprman, &bcm2835_plld_data);
|
|
clks[BCM2835_PLLH] = bcm2835_register_pll(cprman, &bcm2835_pllh_data);
|
|
|
|
clks[BCM2835_PLLA_CORE] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_plla_core_data);
|
|
clks[BCM2835_PLLA_PER] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_plla_per_data);
|
|
clks[BCM2835_PLLC_CORE0] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core0_data);
|
|
clks[BCM2835_PLLC_CORE1] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core1_data);
|
|
clks[BCM2835_PLLC_CORE2] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllc_core2_data);
|
|
clks[BCM2835_PLLC_PER] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllc_per_data);
|
|
clks[BCM2835_PLLD_CORE] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_plld_core_data);
|
|
clks[BCM2835_PLLD_PER] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_plld_per_data);
|
|
clks[BCM2835_PLLH_RCAL] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllh_rcal_data);
|
|
clks[BCM2835_PLLH_AUX] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllh_aux_data);
|
|
clks[BCM2835_PLLH_PIX] =
|
|
bcm2835_register_pll_divider(cprman, &bcm2835_pllh_pix_data);
|
|
|
|
clks[BCM2835_CLOCK_TIMER] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_timer_data);
|
|
clks[BCM2835_CLOCK_OTP] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_otp_data);
|
|
clks[BCM2835_CLOCK_TSENS] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_tsens_data);
|
|
clks[BCM2835_CLOCK_VPU] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_vpu_data);
|
|
clks[BCM2835_CLOCK_V3D] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_v3d_data);
|
|
clks[BCM2835_CLOCK_ISP] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_isp_data);
|
|
clks[BCM2835_CLOCK_H264] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_h264_data);
|
|
clks[BCM2835_CLOCK_V3D] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_v3d_data);
|
|
clks[BCM2835_CLOCK_SDRAM] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_sdram_data);
|
|
clks[BCM2835_CLOCK_UART] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_uart_data);
|
|
clks[BCM2835_CLOCK_VEC] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_vec_data);
|
|
clks[BCM2835_CLOCK_HSM] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_hsm_data);
|
|
clks[BCM2835_CLOCK_EMMC] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_emmc_data);
|
|
|
|
/*
|
|
* CM_PERIICTL (and CM_PERIACTL, CM_SYSCTL and CM_VPUCTL if
|
|
* you have the debug bit set in the power manager, which we
|
|
* don't bother exposing) are individual gates off of the
|
|
* non-stop vpu clock.
|
|
*/
|
|
clks[BCM2835_CLOCK_PERI_IMAGE] =
|
|
clk_register_gate(dev, "peri_image", "vpu",
|
|
CLK_IGNORE_UNUSED | CLK_SET_RATE_GATE,
|
|
cprman->regs + CM_PERIICTL, CM_GATE_BIT,
|
|
0, &cprman->regs_lock);
|
|
|
|
clks[BCM2835_CLOCK_PWM] =
|
|
bcm2835_register_clock(cprman, &bcm2835_clock_pwm_data);
|
|
|
|
return of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
|
|
&cprman->onecell);
|
|
}
|
|
|
|
static const struct of_device_id bcm2835_clk_of_match[] = {
|
|
{ .compatible = "brcm,bcm2835-cprman", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm2835_clk_of_match);
|
|
|
|
static struct platform_driver bcm2835_clk_driver = {
|
|
.driver = {
|
|
.name = "bcm2835-clk",
|
|
.of_match_table = bcm2835_clk_of_match,
|
|
},
|
|
.probe = bcm2835_clk_probe,
|
|
};
|
|
|
|
builtin_platform_driver(bcm2835_clk_driver);
|
|
|
|
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
|
MODULE_DESCRIPTION("BCM2835 clock driver");
|
|
MODULE_LICENSE("GPL v2");
|