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-rw-r--r--drivers/clk/bcm/clk-bcm2835.c2206
1 files changed, 2206 insertions, 0 deletions
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
new file mode 100644
index 000000000..fd78dd535
--- /dev/null
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -0,0 +1,2206 @@
+/*
+ * Copyright (C) 2010,2015 Broadcom
+ * Copyright (C) 2012 Stephen Warren
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+
+/**
+ * DOC: BCM2835 CPRMAN (clock manager for the "audio" domain)
+ *
+ * The clock tree on the 2835 has several levels. There's a root
+ * oscillator running at 19.2Mhz. After the oscillator there are 5
+ * PLLs, roughly divided as "camera", "ARM", "core", "DSI displays",
+ * and "HDMI displays". Those 5 PLLs each can divide their output to
+ * produce up to 4 channels. Finally, there is the level of clocks to
+ * be consumed by other hardware components (like "H264" or "HDMI
+ * state machine"), which divide off of some subset of the PLL
+ * channels.
+ *
+ * All of the clocks in the tree are exposed in the DT, because the DT
+ * may want to make assignments of the final layer of clocks to the
+ * PLL channels, and some components of the hardware will actually
+ * skip layers of the tree (for example, the pixel clock comes
+ * directly from the PLLH PIX channel without using a CM_*CTL clock
+ * generator).
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <dt-bindings/clock/bcm2835.h>
+
+#define CM_PASSWORD 0x5a000000
+
+#define CM_GNRICCTL 0x000
+#define CM_GNRICDIV 0x004
+# define CM_DIV_FRAC_BITS 12
+# define CM_DIV_FRAC_MASK GENMASK(CM_DIV_FRAC_BITS - 1, 0)
+
+#define CM_VPUCTL 0x008
+#define CM_VPUDIV 0x00c
+#define CM_SYSCTL 0x010
+#define CM_SYSDIV 0x014
+#define CM_PERIACTL 0x018
+#define CM_PERIADIV 0x01c
+#define CM_PERIICTL 0x020
+#define CM_PERIIDIV 0x024
+#define CM_H264CTL 0x028
+#define CM_H264DIV 0x02c
+#define CM_ISPCTL 0x030
+#define CM_ISPDIV 0x034
+#define CM_V3DCTL 0x038
+#define CM_V3DDIV 0x03c
+#define CM_CAM0CTL 0x040
+#define CM_CAM0DIV 0x044
+#define CM_CAM1CTL 0x048
+#define CM_CAM1DIV 0x04c
+#define CM_CCP2CTL 0x050
+#define CM_CCP2DIV 0x054
+#define CM_DSI0ECTL 0x058
+#define CM_DSI0EDIV 0x05c
+#define CM_DSI0PCTL 0x060
+#define CM_DSI0PDIV 0x064
+#define CM_DPICTL 0x068
+#define CM_DPIDIV 0x06c
+#define CM_GP0CTL 0x070
+#define CM_GP0DIV 0x074
+#define CM_GP1CTL 0x078
+#define CM_GP1DIV 0x07c
+#define CM_GP2CTL 0x080
+#define CM_GP2DIV 0x084
+#define CM_HSMCTL 0x088
+#define CM_HSMDIV 0x08c
+#define CM_OTPCTL 0x090
+#define CM_OTPDIV 0x094
+#define CM_PCMCTL 0x098
+#define CM_PCMDIV 0x09c
+#define CM_PWMCTL 0x0a0
+#define CM_PWMDIV 0x0a4
+#define CM_SLIMCTL 0x0a8
+#define CM_SLIMDIV 0x0ac
+#define CM_SMICTL 0x0b0
+#define CM_SMIDIV 0x0b4
+/* no definition for 0x0b8 and 0x0bc */
+#define CM_TCNTCTL 0x0c0
+# define CM_TCNT_SRC1_SHIFT 12
+#define CM_TCNTCNT 0x0c4
+#define CM_TECCTL 0x0c8
+#define CM_TECDIV 0x0cc
+#define CM_TD0CTL 0x0d0
+#define CM_TD0DIV 0x0d4
+#define CM_TD1CTL 0x0d8
+#define CM_TD1DIV 0x0dc
+#define CM_TSENSCTL 0x0e0
+#define CM_TSENSDIV 0x0e4
+#define CM_TIMERCTL 0x0e8
+#define CM_TIMERDIV 0x0ec
+#define CM_UARTCTL 0x0f0
+#define CM_UARTDIV 0x0f4
+#define CM_VECCTL 0x0f8
+#define CM_VECDIV 0x0fc
+#define CM_PULSECTL 0x190
+#define CM_PULSEDIV 0x194
+#define CM_SDCCTL 0x1a8
+#define CM_SDCDIV 0x1ac
+#define CM_ARMCTL 0x1b0
+#define CM_AVEOCTL 0x1b8
+#define CM_AVEODIV 0x1bc
+#define CM_EMMCCTL 0x1c0
+#define CM_EMMCDIV 0x1c4
+
+/* General bits for the CM_*CTL regs */
+# define CM_ENABLE BIT(4)
+# define CM_KILL BIT(5)
+# define CM_GATE_BIT 6
+# define CM_GATE BIT(CM_GATE_BIT)
+# define CM_BUSY BIT(7)
+# define CM_BUSYD BIT(8)
+# define CM_FRAC BIT(9)
+# define CM_SRC_SHIFT 0
+# define CM_SRC_BITS 4
+# define CM_SRC_MASK 0xf
+# define CM_SRC_GND 0
+# define CM_SRC_OSC 1
+# define CM_SRC_TESTDEBUG0 2
+# define CM_SRC_TESTDEBUG1 3
+# define CM_SRC_PLLA_CORE 4
+# define CM_SRC_PLLA_PER 4
+# define CM_SRC_PLLC_CORE0 5
+# define CM_SRC_PLLC_PER 5
+# define CM_SRC_PLLC_CORE1 8
+# define CM_SRC_PLLD_CORE 6
+# define CM_SRC_PLLD_PER 6
+# define CM_SRC_PLLH_AUX 7
+# define CM_SRC_PLLC_CORE1 8
+# define CM_SRC_PLLC_CORE2 9
+
+#define CM_OSCCOUNT 0x100
+
+#define CM_PLLA 0x104
+# define CM_PLL_ANARST BIT(8)
+# define CM_PLLA_HOLDPER BIT(7)
+# define CM_PLLA_LOADPER BIT(6)
+# define CM_PLLA_HOLDCORE BIT(5)
+# define CM_PLLA_LOADCORE BIT(4)
+# define CM_PLLA_HOLDCCP2 BIT(3)
+# define CM_PLLA_LOADCCP2 BIT(2)
+# define CM_PLLA_HOLDDSI0 BIT(1)
+# define CM_PLLA_LOADDSI0 BIT(0)
+
+#define CM_PLLC 0x108
+# define CM_PLLC_HOLDPER BIT(7)
+# define CM_PLLC_LOADPER BIT(6)
+# define CM_PLLC_HOLDCORE2 BIT(5)
+# define CM_PLLC_LOADCORE2 BIT(4)
+# define CM_PLLC_HOLDCORE1 BIT(3)
+# define CM_PLLC_LOADCORE1 BIT(2)
+# define CM_PLLC_HOLDCORE0 BIT(1)
+# define CM_PLLC_LOADCORE0 BIT(0)
+
+#define CM_PLLD 0x10c
+# define CM_PLLD_HOLDPER BIT(7)
+# define CM_PLLD_LOADPER BIT(6)
+# define CM_PLLD_HOLDCORE BIT(5)
+# define CM_PLLD_LOADCORE BIT(4)
+# define CM_PLLD_HOLDDSI1 BIT(3)
+# define CM_PLLD_LOADDSI1 BIT(2)
+# define CM_PLLD_HOLDDSI0 BIT(1)
+# define CM_PLLD_LOADDSI0 BIT(0)
+
+#define CM_PLLH 0x110
+# define CM_PLLH_LOADRCAL BIT(2)
+# define CM_PLLH_LOADAUX BIT(1)
+# define CM_PLLH_LOADPIX BIT(0)
+
+#define CM_LOCK 0x114
+# define CM_LOCK_FLOCKH BIT(12)
+# define CM_LOCK_FLOCKD BIT(11)
+# define CM_LOCK_FLOCKC BIT(10)
+# define CM_LOCK_FLOCKB BIT(9)
+# define CM_LOCK_FLOCKA BIT(8)
+
+#define CM_EVENT 0x118
+#define CM_DSI1ECTL 0x158
+#define CM_DSI1EDIV 0x15c
+#define CM_DSI1PCTL 0x160
+#define CM_DSI1PDIV 0x164
+#define CM_DFTCTL 0x168
+#define CM_DFTDIV 0x16c
+
+#define CM_PLLB 0x170
+# define CM_PLLB_HOLDARM BIT(1)
+# define CM_PLLB_LOADARM BIT(0)
+
+#define A2W_PLLA_CTRL 0x1100
+#define A2W_PLLC_CTRL 0x1120
+#define A2W_PLLD_CTRL 0x1140
+#define A2W_PLLH_CTRL 0x1160
+#define A2W_PLLB_CTRL 0x11e0
+# define A2W_PLL_CTRL_PRST_DISABLE BIT(17)
+# define A2W_PLL_CTRL_PWRDN BIT(16)
+# define A2W_PLL_CTRL_PDIV_MASK 0x000007000
+# define A2W_PLL_CTRL_PDIV_SHIFT 12
+# define A2W_PLL_CTRL_NDIV_MASK 0x0000003ff
+# define A2W_PLL_CTRL_NDIV_SHIFT 0
+
+#define A2W_PLLA_ANA0 0x1010
+#define A2W_PLLC_ANA0 0x1030
+#define A2W_PLLD_ANA0 0x1050
+#define A2W_PLLH_ANA0 0x1070
+#define A2W_PLLB_ANA0 0x10f0
+
+#define A2W_PLL_KA_SHIFT 7
+#define A2W_PLL_KA_MASK GENMASK(9, 7)
+#define A2W_PLL_KI_SHIFT 19
+#define A2W_PLL_KI_MASK GENMASK(21, 19)
+#define A2W_PLL_KP_SHIFT 15
+#define A2W_PLL_KP_MASK GENMASK(18, 15)
+
+#define A2W_PLLH_KA_SHIFT 19
+#define A2W_PLLH_KA_MASK GENMASK(21, 19)
+#define A2W_PLLH_KI_LOW_SHIFT 22
+#define A2W_PLLH_KI_LOW_MASK GENMASK(23, 22)
+#define A2W_PLLH_KI_HIGH_SHIFT 0
+#define A2W_PLLH_KI_HIGH_MASK GENMASK(0, 0)
+#define A2W_PLLH_KP_SHIFT 1
+#define A2W_PLLH_KP_MASK GENMASK(4, 1)
+
+#define A2W_XOSC_CTRL 0x1190
+# define A2W_XOSC_CTRL_PLLB_ENABLE BIT(7)
+# define A2W_XOSC_CTRL_PLLA_ENABLE BIT(6)
+# define A2W_XOSC_CTRL_PLLD_ENABLE BIT(5)
+# define A2W_XOSC_CTRL_DDR_ENABLE BIT(4)
+# define A2W_XOSC_CTRL_CPR1_ENABLE BIT(3)
+# define A2W_XOSC_CTRL_USB_ENABLE BIT(2)
+# define A2W_XOSC_CTRL_HDMI_ENABLE BIT(1)
+# define A2W_XOSC_CTRL_PLLC_ENABLE BIT(0)
+
+#define A2W_PLLA_FRAC 0x1200
+#define A2W_PLLC_FRAC 0x1220
+#define A2W_PLLD_FRAC 0x1240
+#define A2W_PLLH_FRAC 0x1260
+#define A2W_PLLB_FRAC 0x12e0
+# define A2W_PLL_FRAC_MASK ((1 << A2W_PLL_FRAC_BITS) - 1)
+# define A2W_PLL_FRAC_BITS 20
+
+#define A2W_PLL_CHANNEL_DISABLE BIT(8)
+#define A2W_PLL_DIV_BITS 8
+#define A2W_PLL_DIV_SHIFT 0
+
+#define A2W_PLLA_DSI0 0x1300
+#define A2W_PLLA_CORE 0x1400
+#define A2W_PLLA_PER 0x1500
+#define A2W_PLLA_CCP2 0x1600
+
+#define A2W_PLLC_CORE2 0x1320
+#define A2W_PLLC_CORE1 0x1420
+#define A2W_PLLC_PER 0x1520
+#define A2W_PLLC_CORE0 0x1620
+
+#define A2W_PLLD_DSI0 0x1340
+#define A2W_PLLD_CORE 0x1440
+#define A2W_PLLD_PER 0x1540
+#define A2W_PLLD_DSI1 0x1640
+
+#define A2W_PLLH_AUX 0x1360
+#define A2W_PLLH_RCAL 0x1460
+#define A2W_PLLH_PIX 0x1560
+#define A2W_PLLH_STS 0x1660
+
+#define A2W_PLLH_CTRLR 0x1960
+#define A2W_PLLH_FRACR 0x1a60
+#define A2W_PLLH_AUXR 0x1b60
+#define A2W_PLLH_RCALR 0x1c60
+#define A2W_PLLH_PIXR 0x1d60
+#define A2W_PLLH_STSR 0x1e60
+
+#define A2W_PLLB_ARM 0x13e0
+#define A2W_PLLB_SP0 0x14e0
+#define A2W_PLLB_SP1 0x15e0
+#define A2W_PLLB_SP2 0x16e0
+
+#define LOCK_TIMEOUT_NS 100000000
+#define BCM2835_MAX_FB_RATE 1750000000u
+
+/*
+ * Names of clocks used within the driver that need to be replaced
+ * with an external parent's name. This array is in the order that
+ * the clocks node in the DT references external clocks.
+ */
+static const char *const cprman_parent_names[] = {
+ "xosc",
+ "dsi0_byte",
+ "dsi0_ddr2",
+ "dsi0_ddr",
+ "dsi1_byte",
+ "dsi1_ddr2",
+ "dsi1_ddr",
+};
+
+struct bcm2835_cprman {
+ struct device *dev;
+ void __iomem *regs;
+ spinlock_t regs_lock; /* spinlock for all clocks */
+
+ /*
+ * Real names of cprman clock parents looked up through
+ * of_clk_get_parent_name(), which will be used in the
+ * parent_names[] arrays for clock registration.
+ */
+ const char *real_parent_names[ARRAY_SIZE(cprman_parent_names)];
+
+ /* Must be last */
+ struct clk_hw_onecell_data onecell;
+};
+
+static inline void cprman_write(struct bcm2835_cprman *cprman, u32 reg, u32 val)
+{
+ writel(CM_PASSWORD | val, cprman->regs + reg);
+}
+
+static inline u32 cprman_read(struct bcm2835_cprman *cprman, u32 reg)
+{
+ return readl(cprman->regs + reg);
+}
+
+/* Does a cycle of measuring a clock through the TCNT clock, which may
+ * source from many other clocks in the system.
+ */
+static unsigned long bcm2835_measure_tcnt_mux(struct bcm2835_cprman *cprman,
+ u32 tcnt_mux)
+{
+ u32 osccount = 19200; /* 1ms */
+ u32 count;
+ ktime_t timeout;
+
+ spin_lock(&cprman->regs_lock);
+
+ cprman_write(cprman, CM_TCNTCTL, CM_KILL);
+
+ cprman_write(cprman, CM_TCNTCTL,
+ (tcnt_mux & CM_SRC_MASK) |
+ (tcnt_mux >> CM_SRC_BITS) << CM_TCNT_SRC1_SHIFT);
+
+ cprman_write(cprman, CM_OSCCOUNT, osccount);
+
+ /* do a kind delay at the start */
+ mdelay(1);
+
+ /* Finish off whatever is left of OSCCOUNT */
+ timeout = ktime_add_ns(ktime_get(), LOCK_TIMEOUT_NS);
+ while (cprman_read(cprman, CM_OSCCOUNT)) {
+ if (ktime_after(ktime_get(), timeout)) {
+ dev_err(cprman->dev, "timeout waiting for OSCCOUNT\n");
+ count = 0;
+ goto out;
+ }
+ cpu_relax();
+ }
+
+ /* Wait for BUSY to clear. */
+ timeout = ktime_add_ns(ktime_get(), LOCK_TIMEOUT_NS);
+ while (cprman_read(cprman, CM_TCNTCTL) & CM_BUSY) {
+ if (ktime_after(ktime_get(), timeout)) {
+ dev_err(cprman->dev, "timeout waiting for !BUSY\n");
+ count = 0;
+ goto out;
+ }
+ cpu_relax();
+ }
+
+ count = cprman_read(cprman, CM_TCNTCNT);
+
+ cprman_write(cprman, CM_TCNTCTL, 0);
+
+out:
+ spin_unlock(&cprman->regs_lock);
+
+ return count * 1000;
+}
+
+static void bcm2835_debugfs_regset(struct bcm2835_cprman *cprman, u32 base,
+ struct debugfs_reg32 *regs, size_t nregs,
+ struct dentry *dentry)
+{
+ struct debugfs_regset32 *regset;
+
+ regset = devm_kzalloc(cprman->dev, sizeof(*regset), GFP_KERNEL);
+ if (!regset)
+ return;
+
+ regset->regs = regs;
+ regset->nregs = nregs;
+ regset->base = cprman->regs + base;
+
+ debugfs_create_regset32("regdump", S_IRUGO, dentry, regset);
+}
+
+struct bcm2835_pll_data {
+ const char *name;
+ u32 cm_ctrl_reg;
+ u32 a2w_ctrl_reg;
+ u32 frac_reg;
+ u32 ana_reg_base;
+ u32 reference_enable_mask;
+ /* Bit in CM_LOCK to indicate when the PLL has locked. */
+ u32 lock_mask;
+
+ const struct bcm2835_pll_ana_bits *ana;
+
+ unsigned long min_rate;
+ unsigned long max_rate;
+ /*
+ * Highest rate for the VCO before we have to use the
+ * pre-divide-by-2.
+ */
+ unsigned long max_fb_rate;
+};
+
+struct bcm2835_pll_ana_bits {
+ u32 mask0;
+ u32 set0;
+ u32 mask1;
+ u32 set1;
+ u32 mask3;
+ u32 set3;
+ u32 fb_prediv_mask;
+};
+
+static const struct bcm2835_pll_ana_bits bcm2835_ana_default = {
+ .mask0 = 0,
+ .set0 = 0,
+ .mask1 = A2W_PLL_KI_MASK | A2W_PLL_KP_MASK,
+ .set1 = (2 << A2W_PLL_KI_SHIFT) | (8 << A2W_PLL_KP_SHIFT),
+ .mask3 = A2W_PLL_KA_MASK,
+ .set3 = (2 << A2W_PLL_KA_SHIFT),
+ .fb_prediv_mask = BIT(14),
+};
+
+static const struct bcm2835_pll_ana_bits bcm2835_ana_pllh = {
+ .mask0 = A2W_PLLH_KA_MASK | A2W_PLLH_KI_LOW_MASK,
+ .set0 = (2 << A2W_PLLH_KA_SHIFT) | (2 << A2W_PLLH_KI_LOW_SHIFT),
+ .mask1 = A2W_PLLH_KI_HIGH_MASK | A2W_PLLH_KP_MASK,
+ .set1 = (6 << A2W_PLLH_KP_SHIFT),
+ .mask3 = 0,
+ .set3 = 0,
+ .fb_prediv_mask = BIT(11),
+};
+
+struct bcm2835_pll_divider_data {
+ const char *name;
+ const char *source_pll;
+
+ u32 cm_reg;
+ u32 a2w_reg;
+
+ u32 load_mask;
+ u32 hold_mask;
+ u32 fixed_divider;
+ u32 flags;
+};
+
+struct bcm2835_clock_data {
+ const char *name;
+
+ const char *const *parents;
+ int num_mux_parents;
+
+ /* Bitmap encoding which parents accept rate change propagation. */
+ unsigned int set_rate_parent;
+
+ 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;
+
+ u32 flags;
+
+ bool is_vpu_clock;
+ bool is_mash_clock;
+ bool low_jitter;
+
+ u32 tcnt_mux;
+};
+
+struct bcm2835_gate_data {
+ const char *name;
+ const char *parent;
+
+ u32 ctl_reg;
+};
+
+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)
+{
+ struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
+ const struct bcm2835_pll_data *data = pll->data;
+ u32 ndiv, fdiv;
+
+ rate = clamp(rate, data->min_rate, data->max_rate);
+
+ 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;
+ fdiv *= 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;
+
+ spin_lock(&cprman->regs_lock);
+ cprman_write(cprman, data->cm_ctrl_reg, CM_PLL_ANARST);
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) |
+ A2W_PLL_CTRL_PWRDN);
+ spin_unlock(&cprman->regs_lock);
+}
+
+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;
+
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) &
+ ~A2W_PLL_CTRL_PWRDN);
+
+ /* Take the PLL out of reset. */
+ spin_lock(&cprman->regs_lock);
+ cprman_write(cprman, data->cm_ctrl_reg,
+ cprman_read(cprman, data->cm_ctrl_reg) & ~CM_PLL_ANARST);
+ spin_unlock(&cprman->regs_lock);
+
+ /* 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();
+ }
+
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) |
+ A2W_PLL_CTRL_PRST_DISABLE);
+
+ 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->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. */
+ spin_lock(&cprman->regs_lock);
+ cprman_write(cprman, A2W_XOSC_CTRL,
+ cprman_read(cprman, A2W_XOSC_CTRL) |
+ data->reference_enable_mask);
+ spin_unlock(&cprman->regs_lock);
+
+ 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 void bcm2835_pll_debug_init(struct clk_hw *hw,
+ struct dentry *dentry)
+{
+ 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;
+ struct debugfs_reg32 *regs;
+
+ regs = devm_kcalloc(cprman->dev, 7, sizeof(*regs), GFP_KERNEL);
+ if (!regs)
+ return;
+
+ regs[0].name = "cm_ctrl";
+ regs[0].offset = data->cm_ctrl_reg;
+ regs[1].name = "a2w_ctrl";
+ regs[1].offset = data->a2w_ctrl_reg;
+ regs[2].name = "frac";
+ regs[2].offset = data->frac_reg;
+ regs[3].name = "ana0";
+ regs[3].offset = data->ana_reg_base + 0 * 4;
+ regs[4].name = "ana1";
+ regs[4].offset = data->ana_reg_base + 1 * 4;
+ regs[5].name = "ana2";
+ regs[5].offset = data->ana_reg_base + 2 * 4;
+ regs[6].name = "ana3";
+ regs[6].offset = data->ana_reg_base + 3 * 4;
+
+ bcm2835_debugfs_regset(cprman, 0, regs, 7, dentry);
+}
+
+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,
+ .debug_init = bcm2835_pll_debug_init,
+};
+
+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;
+
+ spin_lock(&cprman->regs_lock);
+ cprman_write(cprman, data->cm_reg,
+ (cprman_read(cprman, data->cm_reg) &
+ ~data->load_mask) | data->hold_mask);
+ cprman_write(cprman, data->a2w_reg,
+ cprman_read(cprman, data->a2w_reg) |
+ A2W_PLL_CHANNEL_DISABLE);
+ spin_unlock(&cprman->regs_lock);
+}
+
+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;
+
+ spin_lock(&cprman->regs_lock);
+ 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);
+ spin_unlock(&cprman->regs_lock);
+
+ 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 void bcm2835_pll_divider_debug_init(struct clk_hw *hw,
+ struct dentry *dentry)
+{
+ 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;
+ struct debugfs_reg32 *regs;
+
+ regs = devm_kcalloc(cprman->dev, 7, sizeof(*regs), GFP_KERNEL);
+ if (!regs)
+ return;
+
+ regs[0].name = "cm";
+ regs[0].offset = data->cm_reg;
+ regs[1].name = "a2w";
+ regs[1].offset = data->a2w_reg;
+
+ bcm2835_debugfs_regset(cprman, 0, regs, 2, dentry);
+}
+
+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,
+ .debug_init = bcm2835_pll_divider_debug_init,
+};
+
+/*
+ * 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)
+{
+ 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, mindiv, maxdiv;
+
+ rem = do_div(temp, rate);
+ div = temp;
+ div &= ~unused_frac_mask;
+
+ /* different clamping limits apply for a mash clock */
+ if (data->is_mash_clock) {
+ /* clamp to min divider of 2 */
+ mindiv = 2 << CM_DIV_FRAC_BITS;
+ /* clamp to the highest possible integer divider */
+ maxdiv = (BIT(data->int_bits) - 1) << CM_DIV_FRAC_BITS;
+ } else {
+ /* clamp to min divider of 1 */
+ mindiv = 1 << CM_DIV_FRAC_BITS;
+ /* clamp to the highest possible fractional divider */
+ maxdiv = GENMASK(data->int_bits + CM_DIV_FRAC_BITS - 1,
+ CM_DIV_FRAC_BITS - data->frac_bits);
+ }
+
+ /* apply the clamping limits */
+ div = max_t(u32, div, mindiv);
+ div = min_t(u32, div, maxdiv);
+
+ 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;
+
+ if (data->int_bits == 0 && data->frac_bits == 0)
+ return parent_rate;
+
+ /*
+ * 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;
+
+ if (data->int_bits == 0 && data->frac_bits == 0)
+ return parent_rate;
+
+ 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);
+
+ /* Debug code to measure the clock once it's turned on to see
+ * if it's ticking at the rate we expect.
+ */
+ if (data->tcnt_mux && false) {
+ dev_info(cprman->dev,
+ "clk %s: rate %ld, measure %ld\n",
+ data->name,
+ clk_hw_get_rate(hw),
+ bcm2835_measure_tcnt_mux(cprman, data->tcnt_mux));
+ }
+
+ 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);
+ u32 ctl;
+
+ spin_lock(&cprman->regs_lock);
+
+ /*
+ * Setting up frac support
+ *
+ * In principle it is recommended to stop/start the clock first,
+ * but as we set CLK_SET_RATE_GATE during registration of the
+ * clock this requirement should be take care of by the
+ * clk-framework.
+ */
+ ctl = cprman_read(cprman, data->ctl_reg) & ~CM_FRAC;
+ ctl |= (div & CM_DIV_FRAC_MASK) ? CM_FRAC : 0;
+ cprman_write(cprman, data->ctl_reg, ctl);
+
+ cprman_write(cprman, data->div_reg, div);
+
+ spin_unlock(&cprman->regs_lock);
+
+ return 0;
+}
+
+static bool
+bcm2835_clk_is_pllc(struct clk_hw *hw)
+{
+ if (!hw)
+ return false;
+
+ return strncmp(clk_hw_get_name(hw), "pllc", 4) == 0;
+}
+
+static unsigned long bcm2835_clock_choose_div_and_prate(struct clk_hw *hw,
+ int parent_idx,
+ unsigned long rate,
+ u32 *div,
+ unsigned long *prate,
+ unsigned long *avgrate)
+{
+ struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
+ struct bcm2835_cprman *cprman = clock->cprman;
+ const struct bcm2835_clock_data *data = clock->data;
+ unsigned long best_rate = 0;
+ u32 curdiv, mindiv, maxdiv;
+ struct clk_hw *parent;
+
+ parent = clk_hw_get_parent_by_index(hw, parent_idx);
+
+ if (!(BIT(parent_idx) & data->set_rate_parent)) {
+ *prate = clk_hw_get_rate(parent);
+ *div = bcm2835_clock_choose_div(hw, rate, *prate);
+
+ *avgrate = bcm2835_clock_rate_from_divisor(clock, *prate, *div);
+
+ if (data->low_jitter && (*div & CM_DIV_FRAC_MASK)) {
+ unsigned long high, low;
+ u32 int_div = *div & ~CM_DIV_FRAC_MASK;
+
+ high = bcm2835_clock_rate_from_divisor(clock, *prate,
+ int_div);
+ int_div += CM_DIV_FRAC_MASK + 1;
+ low = bcm2835_clock_rate_from_divisor(clock, *prate,
+ int_div);
+
+ /*
+ * Return a value which is the maximum deviation
+ * below the ideal rate, for use as a metric.
+ */
+ return *avgrate - max(*avgrate - low, high - *avgrate);
+ }
+ return *avgrate;
+ }
+
+ if (data->frac_bits)
+ dev_warn(cprman->dev,
+ "frac bits are not used when propagating rate change");
+
+ /* clamp to min divider of 2 if we're dealing with a mash clock */
+ mindiv = data->is_mash_clock ? 2 : 1;
+ maxdiv = BIT(data->int_bits) - 1;
+
+ /* TODO: Be smart, and only test a subset of the available divisors. */
+ for (curdiv = mindiv; curdiv <= maxdiv; curdiv++) {
+ unsigned long tmp_rate;
+
+ tmp_rate = clk_hw_round_rate(parent, rate * curdiv);
+ tmp_rate /= curdiv;
+ if (curdiv == mindiv ||
+ (tmp_rate > best_rate && tmp_rate <= rate))
+ best_rate = tmp_rate;
+
+ if (best_rate == rate)
+ break;
+ }
+
+ *div = curdiv << CM_DIV_FRAC_BITS;
+ *prate = curdiv * best_rate;
+ *avgrate = best_rate;
+
+ return best_rate;
+}
+
+static int bcm2835_clock_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_hw *parent, *best_parent = NULL;
+ bool current_parent_is_pllc;
+ unsigned long rate, best_rate = 0;
+ unsigned long prate, best_prate = 0;
+ unsigned long avgrate, best_avgrate = 0;
+ size_t i;
+ u32 div;
+
+ current_parent_is_pllc = bcm2835_clk_is_pllc(clk_hw_get_parent(hw));
+
+ /*
+ * 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;
+
+ /*
+ * Don't choose a PLLC-derived clock as our parent
+ * unless it had been manually set that way. PLLC's
+ * frequency gets adjusted by the firmware due to
+ * over-temp or under-voltage conditions, without
+ * prior notification to our clock consumer.
+ */
+ if (bcm2835_clk_is_pllc(parent) && !current_parent_is_pllc)
+ continue;
+
+ rate = bcm2835_clock_choose_div_and_prate(hw, i, req->rate,
+ &div, &prate,
+ &avgrate);
+ if (abs(req->rate - rate) < abs(req->rate - best_rate)) {
+ best_parent = parent;
+ best_prate = prate;
+ best_rate = rate;
+ best_avgrate = avgrate;
+ }
+ }
+
+ if (!best_parent)
+ return -EINVAL;
+
+ req->best_parent_hw = best_parent;
+ req->best_parent_rate = best_prate;
+
+ req->rate = best_avgrate;
+
+ 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 struct debugfs_reg32 bcm2835_debugfs_clock_reg32[] = {
+ {
+ .name = "ctl",
+ .offset = 0,
+ },
+ {
+ .name = "div",
+ .offset = 4,
+ },
+};
+
+static void bcm2835_clock_debug_init(struct clk_hw *hw,
+ struct dentry *dentry)
+{
+ struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
+ struct bcm2835_cprman *cprman = clock->cprman;
+ const struct bcm2835_clock_data *data = clock->data;
+
+ bcm2835_debugfs_regset(cprman, data->ctl_reg,
+ bcm2835_debugfs_clock_reg32,
+ ARRAY_SIZE(bcm2835_debugfs_clock_reg32),
+ dentry);
+}
+
+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,
+ .debug_init = bcm2835_clock_debug_init,
+};
+
+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,
+ .debug_init = bcm2835_clock_debug_init,
+};
+
+static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
+ const struct bcm2835_pll_data *data)
+{
+ struct bcm2835_pll *pll;
+ struct clk_init_data init;
+ int ret;
+
+ memset(&init, 0, sizeof(init));
+
+ /* All of the PLLs derive from the external oscillator. */
+ init.parent_names = &cprman->real_parent_names[0];
+ 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;
+
+ ret = devm_clk_hw_register(cprman->dev, &pll->hw);
+ if (ret) {
+ kfree(pll);
+ return NULL;
+ }
+ return &pll->hw;
+}
+
+static struct clk_hw *
+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;
+ const char *divider_name;
+ int ret;
+
+ 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;
+ init.num_parents = 1;
+ init.name = divider_name;
+ init.ops = &bcm2835_pll_divider_clk_ops;
+ init.flags = data->flags | 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;
+
+ ret = devm_clk_hw_register(cprman->dev, &divider->div.hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /*
+ * 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_hw_register_fixed_factor(cprman->dev, data->name,
+ divider_name,
+ CLK_SET_RATE_PARENT,
+ 1,
+ data->fixed_divider);
+ }
+
+ return &divider->div.hw;
+}
+
+static struct clk_hw *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;
+ int ret;
+
+ /*
+ * Replace our strings referencing parent clocks with the
+ * actual clock-output-name of the parent.
+ */
+ for (i = 0; i < data->num_mux_parents; i++) {
+ parents[i] = data->parents[i];
+
+ ret = match_string(cprman_parent_names,
+ ARRAY_SIZE(cprman_parent_names),
+ parents[i]);
+ if (ret >= 0)
+ parents[i] = cprman->real_parent_names[ret];
+ }
+
+ memset(&init, 0, sizeof(init));
+ init.parent_names = parents;
+ init.num_parents = data->num_mux_parents;
+ init.name = data->name;
+ init.flags = data->flags | CLK_IGNORE_UNUSED;
+
+ /*
+ * Pass the CLK_SET_RATE_PARENT flag if we are allowed to propagate
+ * rate changes on at least of the parents.
+ */
+ if (data->set_rate_parent)
+ init.flags |= CLK_SET_RATE_PARENT;
+
+ 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;
+
+ /* If the clock wasn't actually enabled at boot, it's not
+ * critical.
+ */
+ if (!(cprman_read(cprman, data->ctl_reg) & CM_ENABLE))
+ init.flags &= ~CLK_IS_CRITICAL;
+ }
+
+ clock = devm_kzalloc(cprman->dev, sizeof(*clock), GFP_KERNEL);
+ if (!clock)
+ return NULL;
+
+ clock->cprman = cprman;
+ clock->data = data;
+ clock->hw.init = &init;
+
+ ret = devm_clk_hw_register(cprman->dev, &clock->hw);
+ if (ret)
+ return ERR_PTR(ret);
+ return &clock->hw;
+}
+
+static struct clk_hw *bcm2835_register_gate(struct bcm2835_cprman *cprman,
+ const struct bcm2835_gate_data *data)
+{
+ return clk_hw_register_gate(cprman->dev, data->name, data->parent,
+ CLK_IGNORE_UNUSED | CLK_SET_RATE_GATE,
+ cprman->regs + data->ctl_reg,
+ CM_GATE_BIT, 0, &cprman->regs_lock);
+}
+
+typedef struct clk_hw *(*bcm2835_clk_register)(struct bcm2835_cprman *cprman,
+ const void *data);
+struct bcm2835_clk_desc {
+ bcm2835_clk_register clk_register;
+ const void *data;
+};
+
+/* assignment helper macros for different clock types */
+#define _REGISTER(f, ...) { .clk_register = (bcm2835_clk_register)f, \
+ .data = __VA_ARGS__ }
+#define REGISTER_PLL(...) _REGISTER(&bcm2835_register_pll, \
+ &(struct bcm2835_pll_data) \
+ {__VA_ARGS__})
+#define REGISTER_PLL_DIV(...) _REGISTER(&bcm2835_register_pll_divider, \
+ &(struct bcm2835_pll_divider_data) \
+ {__VA_ARGS__})
+#define REGISTER_CLK(...) _REGISTER(&bcm2835_register_clock, \
+ &(struct bcm2835_clock_data) \
+ {__VA_ARGS__})
+#define REGISTER_GATE(...) _REGISTER(&bcm2835_register_gate, \
+ &(struct bcm2835_gate_data) \
+ {__VA_ARGS__})
+
+/* parent mux arrays plus helper macros */
+
+/* main oscillator parent mux */
+static const char *const bcm2835_clock_osc_parents[] = {
+ "gnd",
+ "xosc",
+ "testdebug0",
+ "testdebug1"
+};
+
+#define REGISTER_OSC_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_clock_osc_parents), \
+ .parents = bcm2835_clock_osc_parents, \
+ __VA_ARGS__)
+
+/* main peripherial parent mux */
+static const char *const bcm2835_clock_per_parents[] = {
+ "gnd",
+ "xosc",
+ "testdebug0",
+ "testdebug1",
+ "plla_per",
+ "pllc_per",
+ "plld_per",
+ "pllh_aux",
+};
+
+#define REGISTER_PER_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_clock_per_parents), \
+ .parents = bcm2835_clock_per_parents, \
+ __VA_ARGS__)
+
+/*
+ * Restrict clock sources for the PCM peripheral to the oscillator and
+ * PLLD_PER because other source may have varying rates or be switched
+ * off.
+ *
+ * Prevent other sources from being selected by replacing their names in
+ * the list of potential parents with dummy entries (entry index is
+ * significant).
+ */
+static const char *const bcm2835_pcm_per_parents[] = {
+ "-",
+ "xosc",
+ "-",
+ "-",
+ "-",
+ "-",
+ "plld_per",
+ "-",
+};
+
+#define REGISTER_PCM_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_pcm_per_parents), \
+ .parents = bcm2835_pcm_per_parents, \
+ __VA_ARGS__)
+
+/* main vpu parent mux */
+static const char *const bcm2835_clock_vpu_parents[] = {
+ "gnd",
+ "xosc",
+ "testdebug0",
+ "testdebug1",
+ "plla_core",
+ "pllc_core0",
+ "plld_core",
+ "pllh_aux",
+ "pllc_core1",
+ "pllc_core2",
+};
+
+#define REGISTER_VPU_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_clock_vpu_parents), \
+ .parents = bcm2835_clock_vpu_parents, \
+ __VA_ARGS__)
+
+/*
+ * DSI parent clocks. The DSI byte/DDR/DDR2 clocks come from the DSI
+ * analog PHY. The _inv variants are generated internally to cprman,
+ * but we don't use them so they aren't hooked up.
+ */
+static const char *const bcm2835_clock_dsi0_parents[] = {
+ "gnd",
+ "xosc",
+ "testdebug0",
+ "testdebug1",
+ "dsi0_ddr",
+ "dsi0_ddr_inv",
+ "dsi0_ddr2",
+ "dsi0_ddr2_inv",
+ "dsi0_byte",
+ "dsi0_byte_inv",
+};
+
+static const char *const bcm2835_clock_dsi1_parents[] = {
+ "gnd",
+ "xosc",
+ "testdebug0",
+ "testdebug1",
+ "dsi1_ddr",
+ "dsi1_ddr_inv",
+ "dsi1_ddr2",
+ "dsi1_ddr2_inv",
+ "dsi1_byte",
+ "dsi1_byte_inv",
+};
+
+#define REGISTER_DSI0_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_clock_dsi0_parents), \
+ .parents = bcm2835_clock_dsi0_parents, \
+ __VA_ARGS__)
+
+#define REGISTER_DSI1_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_clock_dsi1_parents), \
+ .parents = bcm2835_clock_dsi1_parents, \
+ __VA_ARGS__)
+
+/*
+ * the real definition of all the pll, pll_dividers and clocks
+ * these make use of the above REGISTER_* macros
+ */
+static const struct bcm2835_clk_desc clk_desc_array[] = {
+ /* the PLL + PLL dividers */
+
+ /*
+ * PLLA is the auxiliary PLL, used to drive the CCP2
+ * (Compact Camera Port 2) transmitter clock.
+ *
+ * It is in the PX LDO power domain, which is on when the
+ * AUDIO domain is on.
+ */
+ [BCM2835_PLLA] = REGISTER_PLL(
+ .name = "plla",
+ .cm_ctrl_reg = CM_PLLA,
+ .a2w_ctrl_reg = A2W_PLLA_CTRL,
+ .frac_reg = A2W_PLLA_FRAC,
+ .ana_reg_base = A2W_PLLA_ANA0,
+ .reference_enable_mask = A2W_XOSC_CTRL_PLLA_ENABLE,
+ .lock_mask = CM_LOCK_FLOCKA,
+
+ .ana = &bcm2835_ana_default,
+
+ .min_rate = 600000000u,
+ .max_rate = 2400000000u,
+ .max_fb_rate = BCM2835_MAX_FB_RATE),
+ [BCM2835_PLLA_CORE] = REGISTER_PLL_DIV(
+ .name = "plla_core",
+ .source_pll = "plla",
+ .cm_reg = CM_PLLA,
+ .a2w_reg = A2W_PLLA_CORE,
+ .load_mask = CM_PLLA_LOADCORE,
+ .hold_mask = CM_PLLA_HOLDCORE,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLA_PER] = REGISTER_PLL_DIV(
+ .name = "plla_per",
+ .source_pll = "plla",
+ .cm_reg = CM_PLLA,
+ .a2w_reg = A2W_PLLA_PER,
+ .load_mask = CM_PLLA_LOADPER,
+ .hold_mask = CM_PLLA_HOLDPER,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLA_DSI0] = REGISTER_PLL_DIV(
+ .name = "plla_dsi0",
+ .source_pll = "plla",
+ .cm_reg = CM_PLLA,
+ .a2w_reg = A2W_PLLA_DSI0,
+ .load_mask = CM_PLLA_LOADDSI0,
+ .hold_mask = CM_PLLA_HOLDDSI0,
+ .fixed_divider = 1),
+ [BCM2835_PLLA_CCP2] = REGISTER_PLL_DIV(
+ .name = "plla_ccp2",
+ .source_pll = "plla",
+ .cm_reg = CM_PLLA,
+ .a2w_reg = A2W_PLLA_CCP2,
+ .load_mask = CM_PLLA_LOADCCP2,
+ .hold_mask = CM_PLLA_HOLDCCP2,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+
+ /* PLLB is used for the ARM's clock. */
+ [BCM2835_PLLB] = REGISTER_PLL(
+ .name = "pllb",
+ .cm_ctrl_reg = CM_PLLB,
+ .a2w_ctrl_reg = A2W_PLLB_CTRL,
+ .frac_reg = A2W_PLLB_FRAC,
+ .ana_reg_base = A2W_PLLB_ANA0,
+ .reference_enable_mask = A2W_XOSC_CTRL_PLLB_ENABLE,
+ .lock_mask = CM_LOCK_FLOCKB,
+
+ .ana = &bcm2835_ana_default,
+
+ .min_rate = 600000000u,
+ .max_rate = 3000000000u,
+ .max_fb_rate = BCM2835_MAX_FB_RATE),
+ [BCM2835_PLLB_ARM] = REGISTER_PLL_DIV(
+ .name = "pllb_arm",
+ .source_pll = "pllb",
+ .cm_reg = CM_PLLB,
+ .a2w_reg = A2W_PLLB_ARM,
+ .load_mask = CM_PLLB_LOADARM,
+ .hold_mask = CM_PLLB_HOLDARM,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+
+ /*
+ * 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.
+ */
+ [BCM2835_PLLC] = REGISTER_PLL(
+ .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),
+ [BCM2835_PLLC_CORE0] = REGISTER_PLL_DIV(
+ .name = "pllc_core0",
+ .source_pll = "pllc",
+ .cm_reg = CM_PLLC,
+ .a2w_reg = A2W_PLLC_CORE0,
+ .load_mask = CM_PLLC_LOADCORE0,
+ .hold_mask = CM_PLLC_HOLDCORE0,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLC_CORE1] = REGISTER_PLL_DIV(
+ .name = "pllc_core1",
+ .source_pll = "pllc",
+ .cm_reg = CM_PLLC,
+ .a2w_reg = A2W_PLLC_CORE1,
+ .load_mask = CM_PLLC_LOADCORE1,
+ .hold_mask = CM_PLLC_HOLDCORE1,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLC_CORE2] = REGISTER_PLL_DIV(
+ .name = "pllc_core2",
+ .source_pll = "pllc",
+ .cm_reg = CM_PLLC,
+ .a2w_reg = A2W_PLLC_CORE2,
+ .load_mask = CM_PLLC_LOADCORE2,
+ .hold_mask = CM_PLLC_HOLDCORE2,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLC_PER] = REGISTER_PLL_DIV(
+ .name = "pllc_per",
+ .source_pll = "pllc",
+ .cm_reg = CM_PLLC,
+ .a2w_reg = A2W_PLLC_PER,
+ .load_mask = CM_PLLC_LOADPER,
+ .hold_mask = CM_PLLC_HOLDPER,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+
+ /*
+ * 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.
+ */
+ [BCM2835_PLLD] = REGISTER_PLL(
+ .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),
+ [BCM2835_PLLD_CORE] = REGISTER_PLL_DIV(
+ .name = "plld_core",
+ .source_pll = "plld",
+ .cm_reg = CM_PLLD,
+ .a2w_reg = A2W_PLLD_CORE,
+ .load_mask = CM_PLLD_LOADCORE,
+ .hold_mask = CM_PLLD_HOLDCORE,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLD_PER] = REGISTER_PLL_DIV(
+ .name = "plld_per",
+ .source_pll = "plld",
+ .cm_reg = CM_PLLD,
+ .a2w_reg = A2W_PLLD_PER,
+ .load_mask = CM_PLLD_LOADPER,
+ .hold_mask = CM_PLLD_HOLDPER,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLD_DSI0] = REGISTER_PLL_DIV(
+ .name = "plld_dsi0",
+ .source_pll = "plld",
+ .cm_reg = CM_PLLD,
+ .a2w_reg = A2W_PLLD_DSI0,
+ .load_mask = CM_PLLD_LOADDSI0,
+ .hold_mask = CM_PLLD_HOLDDSI0,
+ .fixed_divider = 1),
+ [BCM2835_PLLD_DSI1] = REGISTER_PLL_DIV(
+ .name = "plld_dsi1",
+ .source_pll = "plld",
+ .cm_reg = CM_PLLD,
+ .a2w_reg = A2W_PLLD_DSI1,
+ .load_mask = CM_PLLD_LOADDSI1,
+ .hold_mask = CM_PLLD_HOLDDSI1,
+ .fixed_divider = 1),
+
+ /*
+ * PLLH is used to supply the pixel clock or the AUX clock for the
+ * TV encoder.
+ *
+ * It is in the HDMI power domain.
+ */
+ [BCM2835_PLLH] = REGISTER_PLL(
+ "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),
+ [BCM2835_PLLH_RCAL] = REGISTER_PLL_DIV(
+ .name = "pllh_rcal",
+ .source_pll = "pllh",
+ .cm_reg = CM_PLLH,
+ .a2w_reg = A2W_PLLH_RCAL,
+ .load_mask = CM_PLLH_LOADRCAL,
+ .hold_mask = 0,
+ .fixed_divider = 10,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLH_AUX] = REGISTER_PLL_DIV(
+ .name = "pllh_aux",
+ .source_pll = "pllh",
+ .cm_reg = CM_PLLH,
+ .a2w_reg = A2W_PLLH_AUX,
+ .load_mask = CM_PLLH_LOADAUX,
+ .hold_mask = 0,
+ .fixed_divider = 1,
+ .flags = CLK_SET_RATE_PARENT),
+ [BCM2835_PLLH_PIX] = REGISTER_PLL_DIV(
+ .name = "pllh_pix",
+ .source_pll = "pllh",
+ .cm_reg = CM_PLLH,
+ .a2w_reg = A2W_PLLH_PIX,
+ .load_mask = CM_PLLH_LOADPIX,
+ .hold_mask = 0,
+ .fixed_divider = 10,
+ .flags = CLK_SET_RATE_PARENT),
+
+ /* the clocks */
+
+ /* clocks with oscillator parent mux */
+
+ /* One Time Programmable Memory clock. Maximum 10Mhz. */
+ [BCM2835_CLOCK_OTP] = REGISTER_OSC_CLK(
+ .name = "otp",
+ .ctl_reg = CM_OTPCTL,
+ .div_reg = CM_OTPDIV,
+ .int_bits = 4,
+ .frac_bits = 0,
+ .tcnt_mux = 6),
+ /*
+ * Used for a 1Mhz clock for the system clocksource, and also used
+ * bythe watchdog timer and the camera pulse generator.
+ */
+ [BCM2835_CLOCK_TIMER] = REGISTER_OSC_CLK(
+ .name = "timer",
+ .ctl_reg = CM_TIMERCTL,
+ .div_reg = CM_TIMERDIV,
+ .int_bits = 6,
+ .frac_bits = 12),
+ /*
+ * Clock for the temperature sensor.
+ * Generally run at 2Mhz, max 5Mhz.
+ */
+ [BCM2835_CLOCK_TSENS] = REGISTER_OSC_CLK(
+ .name = "tsens",
+ .ctl_reg = CM_TSENSCTL,
+ .div_reg = CM_TSENSDIV,
+ .int_bits = 5,
+ .frac_bits = 0),
+ [BCM2835_CLOCK_TEC] = REGISTER_OSC_CLK(
+ .name = "tec",
+ .ctl_reg = CM_TECCTL,
+ .div_reg = CM_TECDIV,
+ .int_bits = 6,
+ .frac_bits = 0),
+
+ /* clocks with vpu parent mux */
+ [BCM2835_CLOCK_H264] = REGISTER_VPU_CLK(
+ .name = "h264",
+ .ctl_reg = CM_H264CTL,
+ .div_reg = CM_H264DIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 1),
+ [BCM2835_CLOCK_ISP] = REGISTER_VPU_CLK(
+ .name = "isp",
+ .ctl_reg = CM_ISPCTL,
+ .div_reg = CM_ISPDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 2),
+
+ /*
+ * Secondary SDRAM clock. Used for low-voltage modes when the PLL
+ * in the SDRAM controller can't be used.
+ */
+ [BCM2835_CLOCK_SDRAM] = REGISTER_VPU_CLK(
+ .name = "sdram",
+ .ctl_reg = CM_SDCCTL,
+ .div_reg = CM_SDCDIV,
+ .int_bits = 6,
+ .frac_bits = 0,
+ .tcnt_mux = 3),
+ [BCM2835_CLOCK_V3D] = REGISTER_VPU_CLK(
+ .name = "v3d",
+ .ctl_reg = CM_V3DCTL,
+ .div_reg = CM_V3DDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 4),
+ /*
+ * 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.
+ */
+ [BCM2835_CLOCK_VPU] = REGISTER_VPU_CLK(
+ .name = "vpu",
+ .ctl_reg = CM_VPUCTL,
+ .div_reg = CM_VPUDIV,
+ .int_bits = 12,
+ .frac_bits = 8,
+ .flags = CLK_IS_CRITICAL,
+ .is_vpu_clock = true,
+ .tcnt_mux = 5),
+
+ /* clocks with per parent mux */
+ [BCM2835_CLOCK_AVEO] = REGISTER_PER_CLK(
+ .name = "aveo",
+ .ctl_reg = CM_AVEOCTL,
+ .div_reg = CM_AVEODIV,
+ .int_bits = 4,
+ .frac_bits = 0,
+ .tcnt_mux = 38),
+ [BCM2835_CLOCK_CAM0] = REGISTER_PER_CLK(
+ .name = "cam0",
+ .ctl_reg = CM_CAM0CTL,
+ .div_reg = CM_CAM0DIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 14),
+ [BCM2835_CLOCK_CAM1] = REGISTER_PER_CLK(
+ .name = "cam1",
+ .ctl_reg = CM_CAM1CTL,
+ .div_reg = CM_CAM1DIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 15),
+ [BCM2835_CLOCK_DFT] = REGISTER_PER_CLK(
+ .name = "dft",
+ .ctl_reg = CM_DFTCTL,
+ .div_reg = CM_DFTDIV,
+ .int_bits = 5,
+ .frac_bits = 0),
+ [BCM2835_CLOCK_DPI] = REGISTER_PER_CLK(
+ .name = "dpi",
+ .ctl_reg = CM_DPICTL,
+ .div_reg = CM_DPIDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 17),
+
+ /* Arasan EMMC clock */
+ [BCM2835_CLOCK_EMMC] = REGISTER_PER_CLK(
+ .name = "emmc",
+ .ctl_reg = CM_EMMCCTL,
+ .div_reg = CM_EMMCDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 39),
+
+ /* General purpose (GPIO) clocks */
+ [BCM2835_CLOCK_GP0] = REGISTER_PER_CLK(
+ .name = "gp0",
+ .ctl_reg = CM_GP0CTL,
+ .div_reg = CM_GP0DIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .is_mash_clock = true,
+ .tcnt_mux = 20),
+ [BCM2835_CLOCK_GP1] = REGISTER_PER_CLK(
+ .name = "gp1",
+ .ctl_reg = CM_GP1CTL,
+ .div_reg = CM_GP1DIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .flags = CLK_IS_CRITICAL,
+ .is_mash_clock = true,
+ .tcnt_mux = 21),
+ [BCM2835_CLOCK_GP2] = REGISTER_PER_CLK(
+ .name = "gp2",
+ .ctl_reg = CM_GP2CTL,
+ .div_reg = CM_GP2DIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .flags = CLK_IS_CRITICAL),
+
+ /* HDMI state machine */
+ [BCM2835_CLOCK_HSM] = REGISTER_PER_CLK(
+ .name = "hsm",
+ .ctl_reg = CM_HSMCTL,
+ .div_reg = CM_HSMDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 22),
+ [BCM2835_CLOCK_PCM] = REGISTER_PCM_CLK(
+ .name = "pcm",
+ .ctl_reg = CM_PCMCTL,
+ .div_reg = CM_PCMDIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .is_mash_clock = true,
+ .low_jitter = true,
+ .tcnt_mux = 23),
+ [BCM2835_CLOCK_PWM] = REGISTER_PER_CLK(
+ .name = "pwm",
+ .ctl_reg = CM_PWMCTL,
+ .div_reg = CM_PWMDIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .is_mash_clock = true,
+ .tcnt_mux = 24),
+ [BCM2835_CLOCK_SLIM] = REGISTER_PER_CLK(
+ .name = "slim",
+ .ctl_reg = CM_SLIMCTL,
+ .div_reg = CM_SLIMDIV,
+ .int_bits = 12,
+ .frac_bits = 12,
+ .is_mash_clock = true,
+ .tcnt_mux = 25),
+ [BCM2835_CLOCK_SMI] = REGISTER_PER_CLK(
+ .name = "smi",
+ .ctl_reg = CM_SMICTL,
+ .div_reg = CM_SMIDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 27),
+ [BCM2835_CLOCK_UART] = REGISTER_PER_CLK(
+ .name = "uart",
+ .ctl_reg = CM_UARTCTL,
+ .div_reg = CM_UARTDIV,
+ .int_bits = 10,
+ .frac_bits = 12,
+ .tcnt_mux = 28),
+
+ /* TV encoder clock. Only operating frequency is 108Mhz. */
+ [BCM2835_CLOCK_VEC] = REGISTER_PER_CLK(
+ .name = "vec",
+ .ctl_reg = CM_VECCTL,
+ .div_reg = CM_VECDIV,
+ .int_bits = 4,
+ .frac_bits = 0,
+ /*
+ * Allow rate change propagation only on PLLH_AUX which is
+ * assigned index 7 in the parent array.
+ */
+ .set_rate_parent = BIT(7),
+ .tcnt_mux = 29),
+
+ /* dsi clocks */
+ [BCM2835_CLOCK_DSI0E] = REGISTER_PER_CLK(
+ .name = "dsi0e",
+ .ctl_reg = CM_DSI0ECTL,
+ .div_reg = CM_DSI0EDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 18),
+ [BCM2835_CLOCK_DSI1E] = REGISTER_PER_CLK(
+ .name = "dsi1e",
+ .ctl_reg = CM_DSI1ECTL,
+ .div_reg = CM_DSI1EDIV,
+ .int_bits = 4,
+ .frac_bits = 8,
+ .tcnt_mux = 19),
+ [BCM2835_CLOCK_DSI0P] = REGISTER_DSI0_CLK(
+ .name = "dsi0p",
+ .ctl_reg = CM_DSI0PCTL,
+ .div_reg = CM_DSI0PDIV,
+ .int_bits = 0,
+ .frac_bits = 0,
+ .tcnt_mux = 12),
+ [BCM2835_CLOCK_DSI1P] = REGISTER_DSI1_CLK(
+ .name = "dsi1p",
+ .ctl_reg = CM_DSI1PCTL,
+ .div_reg = CM_DSI1PDIV,
+ .int_bits = 0,
+ .frac_bits = 0,
+ .tcnt_mux = 13),
+
+ /* the gates */
+
+ /*
+ * 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.
+ */
+ [BCM2835_CLOCK_PERI_IMAGE] = REGISTER_GATE(
+ .name = "peri_image",
+ .parent = "vpu",
+ .ctl_reg = CM_PERIICTL),
+};
+
+/*
+ * Permanently take a reference on the parent of the SDRAM clock.
+ *
+ * While the SDRAM is being driven by its dedicated PLL most of the
+ * time, there is a little loop running in the firmware that
+ * periodically switches the SDRAM to using our CM clock to do PVT
+ * recalibration, with the assumption that the previously configured
+ * SDRAM parent is still enabled and running.
+ */
+static int bcm2835_mark_sdc_parent_critical(struct clk *sdc)
+{
+ struct clk *parent = clk_get_parent(sdc);
+
+ if (IS_ERR(parent))
+ return PTR_ERR(parent);
+
+ return clk_prepare_enable(parent);
+}
+
+static int bcm2835_clk_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct clk_hw **hws;
+ struct bcm2835_cprman *cprman;
+ struct resource *res;
+ const struct bcm2835_clk_desc *desc;
+ const size_t asize = ARRAY_SIZE(clk_desc_array);
+ size_t i;
+ int ret;
+
+ cprman = devm_kzalloc(dev,
+ struct_size(cprman, onecell.hws, asize),
+ 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);
+
+ memcpy(cprman->real_parent_names, cprman_parent_names,
+ sizeof(cprman_parent_names));
+ of_clk_parent_fill(dev->of_node, cprman->real_parent_names,
+ ARRAY_SIZE(cprman_parent_names));
+
+ /*
+ * Make sure the external oscillator has been registered.
+ *
+ * The other (DSI) clocks are not present on older device
+ * trees, which we still need to support for backwards
+ * compatibility.
+ */
+ if (!cprman->real_parent_names[0])
+ return -ENODEV;
+
+ platform_set_drvdata(pdev, cprman);
+
+ cprman->onecell.num = asize;
+ hws = cprman->onecell.hws;
+
+ for (i = 0; i < asize; i++) {
+ desc = &clk_desc_array[i];
+ if (desc->clk_register && desc->data)
+ hws[i] = desc->clk_register(cprman, desc->data);
+ }
+
+ ret = bcm2835_mark_sdc_parent_critical(hws[BCM2835_CLOCK_SDRAM]->clk);
+ if (ret)
+ return ret;
+
+ return of_clk_add_hw_provider(dev->of_node, of_clk_hw_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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 08:55:49 +0000