1 // SPDX-License-Identifier: BSD-3-Clause
2 /*
3 * Clock drivers for Qualcomm APQ8016, APQ8096
4 *
5 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 *
7 * Based on Little Kernel driver, simplified
8 */
9
10 #include <common.h>
11 #include <clk-uclass.h>
12 #include <dm.h>
13 #include <errno.h>
14 #include <asm/io.h>
15 #include <linux/bitops.h>
16 #include "clock-snapdragon.h"
17
18 /* CBCR register fields */
19 #define CBCR_BRANCH_ENABLE_BIT BIT(0)
20 #define CBCR_BRANCH_OFF_BIT BIT(31)
21
22 extern ulong msm_set_rate(struct clk *clk, ulong rate);
23
24 /* Enable clock controlled by CBC soft macro */
clk_enable_cbc(phys_addr_t cbcr)25 void clk_enable_cbc(phys_addr_t cbcr)
26 {
27 setbits_le32(cbcr, CBCR_BRANCH_ENABLE_BIT);
28
29 while (readl(cbcr) & CBCR_BRANCH_OFF_BIT)
30 ;
31 }
32
clk_enable_gpll0(phys_addr_t base,const struct pll_vote_clk * gpll0)33 void clk_enable_gpll0(phys_addr_t base, const struct pll_vote_clk *gpll0)
34 {
35 if (readl(base + gpll0->status) & gpll0->status_bit)
36 return; /* clock already enabled */
37
38 setbits_le32(base + gpll0->ena_vote, gpll0->vote_bit);
39
40 while ((readl(base + gpll0->status) & gpll0->status_bit) == 0)
41 ;
42 }
43
44 #define BRANCH_ON_VAL (0)
45 #define BRANCH_NOC_FSM_ON_VAL BIT(29)
46 #define BRANCH_CHECK_MASK GENMASK(31, 28)
47
clk_enable_vote_clk(phys_addr_t base,const struct vote_clk * vclk)48 void clk_enable_vote_clk(phys_addr_t base, const struct vote_clk *vclk)
49 {
50 u32 val;
51
52 setbits_le32(base + vclk->ena_vote, vclk->vote_bit);
53 do {
54 val = readl(base + vclk->cbcr_reg);
55 val &= BRANCH_CHECK_MASK;
56 } while ((val != BRANCH_ON_VAL) && (val != BRANCH_NOC_FSM_ON_VAL));
57 }
58
59 #define APPS_CMD_RGCR_UPDATE BIT(0)
60
61 /* Update clock command via CMD_RGCR */
clk_bcr_update(phys_addr_t apps_cmd_rgcr)62 void clk_bcr_update(phys_addr_t apps_cmd_rgcr)
63 {
64 setbits_le32(apps_cmd_rgcr, APPS_CMD_RGCR_UPDATE);
65
66 /* Wait for frequency to be updated. */
67 while (readl(apps_cmd_rgcr) & APPS_CMD_RGCR_UPDATE)
68 ;
69 }
70
71 #define CFG_MODE_DUAL_EDGE (0x2 << 12) /* Counter mode */
72
73 #define CFG_MASK 0x3FFF
74
75 #define CFG_DIVIDER_MASK 0x1F
76
77 /* root set rate for clocks with half integer and MND divider */
clk_rcg_set_rate_mnd(phys_addr_t base,const struct bcr_regs * regs,int div,int m,int n,int source)78 void clk_rcg_set_rate_mnd(phys_addr_t base, const struct bcr_regs *regs,
79 int div, int m, int n, int source)
80 {
81 u32 cfg;
82 /* M value for MND divider. */
83 u32 m_val = m;
84 /* NOT(N-M) value for MND divider. */
85 u32 n_val = ~((n) - (m)) * !!(n);
86 /* NOT 2D value for MND divider. */
87 u32 d_val = ~(n);
88
89 /* Program MND values */
90 writel(m_val, base + regs->M);
91 writel(n_val, base + regs->N);
92 writel(d_val, base + regs->D);
93
94 /* setup src select and divider */
95 cfg = readl(base + regs->cfg_rcgr);
96 cfg &= ~CFG_MASK;
97 cfg |= source & CFG_CLK_SRC_MASK; /* Select clock source */
98
99 /* Set the divider; HW permits fraction dividers (+0.5), but
100 for simplicity, we will support integers only */
101 if (div)
102 cfg |= (2 * div - 1) & CFG_DIVIDER_MASK;
103
104 if (n_val)
105 cfg |= CFG_MODE_DUAL_EDGE;
106
107 writel(cfg, base + regs->cfg_rcgr); /* Write new clock configuration */
108
109 /* Inform h/w to start using the new config. */
110 clk_bcr_update(base + regs->cmd_rcgr);
111 }
112
msm_clk_probe(struct udevice * dev)113 static int msm_clk_probe(struct udevice *dev)
114 {
115 struct msm_clk_priv *priv = dev_get_priv(dev);
116
117 priv->base = dev_read_addr(dev);
118 if (priv->base == FDT_ADDR_T_NONE)
119 return -EINVAL;
120
121 return 0;
122 }
123
msm_clk_set_rate(struct clk * clk,ulong rate)124 static ulong msm_clk_set_rate(struct clk *clk, ulong rate)
125 {
126 return msm_set_rate(clk, rate);
127 }
128
129 static struct clk_ops msm_clk_ops = {
130 .set_rate = msm_clk_set_rate,
131 };
132
133 static const struct udevice_id msm_clk_ids[] = {
134 { .compatible = "qcom,gcc-msm8916" },
135 { .compatible = "qcom,gcc-apq8016" },
136 { .compatible = "qcom,gcc-msm8996" },
137 { .compatible = "qcom,gcc-apq8096" },
138 { }
139 };
140
141 U_BOOT_DRIVER(clk_msm) = {
142 .name = "clk_msm",
143 .id = UCLASS_CLK,
144 .of_match = msm_clk_ids,
145 .ops = &msm_clk_ops,
146 .priv_auto = sizeof(struct msm_clk_priv),
147 .probe = msm_clk_probe,
148 };
149