1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bits.h> 3 #include <linux/clk.h> 4 #include <linux/clk-provider.h> 5 #include <linux/err.h> 6 #include <linux/io.h> 7 #include <linux/module.h> 8 #include <linux/of.h> 9 #include <linux/slab.h> 10 #include <linux/spinlock.h> 11 #include "clk.h" 12 13 #define CCM_CCDR 0x4 14 #define CCDR_MMDC_CH0_MASK BIT(17) 15 #define CCDR_MMDC_CH1_MASK BIT(16) 16 17 DEFINE_SPINLOCK(imx_ccm_lock); 18 EXPORT_SYMBOL_GPL(imx_ccm_lock); 19 20 bool mcore_booted; 21 EXPORT_SYMBOL_GPL(mcore_booted); 22 23 void imx_unregister_clocks(struct clk *clks[], unsigned int count) 24 { 25 unsigned int i; 26 27 for (i = 0; i < count; i++) 28 clk_unregister(clks[i]); 29 } 30 31 void imx_unregister_hw_clocks(struct clk_hw *hws[], unsigned int count) 32 { 33 unsigned int i; 34 35 for (i = 0; i < count; i++) 36 clk_hw_unregister(hws[i]); 37 } 38 EXPORT_SYMBOL_GPL(imx_unregister_hw_clocks); 39 40 void imx_mmdc_mask_handshake(void __iomem *ccm_base, 41 unsigned int chn) 42 { 43 unsigned int reg; 44 45 reg = readl_relaxed(ccm_base + CCM_CCDR); 46 reg |= chn == 0 ? CCDR_MMDC_CH0_MASK : CCDR_MMDC_CH1_MASK; 47 writel_relaxed(reg, ccm_base + CCM_CCDR); 48 } 49 50 void imx_check_clocks(struct clk *clks[], unsigned int count) 51 { 52 unsigned i; 53 54 for (i = 0; i < count; i++) 55 if (IS_ERR(clks[i])) 56 pr_err("i.MX clk %u: register failed with %ld\n", 57 i, PTR_ERR(clks[i])); 58 } 59 60 void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count) 61 { 62 unsigned int i; 63 64 for (i = 0; i < count; i++) 65 if (IS_ERR(clks[i])) 66 pr_err("i.MX clk %u: register failed with %ld\n", 67 i, PTR_ERR(clks[i])); 68 } 69 EXPORT_SYMBOL_GPL(imx_check_clk_hws); 70 71 static struct clk *imx_obtain_fixed_clock_from_dt(const char *name) 72 { 73 struct of_phandle_args phandle; 74 struct clk *clk = ERR_PTR(-ENODEV); 75 char *path; 76 77 path = kasprintf(GFP_KERNEL, "/clocks/%s", name); 78 if (!path) 79 return ERR_PTR(-ENOMEM); 80 81 phandle.np = of_find_node_by_path(path); 82 kfree(path); 83 84 if (phandle.np) { 85 clk = of_clk_get_from_provider(&phandle); 86 of_node_put(phandle.np); 87 } 88 return clk; 89 } 90 91 struct clk *imx_obtain_fixed_clock( 92 const char *name, unsigned long rate) 93 { 94 struct clk *clk; 95 96 clk = imx_obtain_fixed_clock_from_dt(name); 97 if (IS_ERR(clk)) 98 clk = imx_clk_fixed(name, rate); 99 return clk; 100 } 101 102 struct clk_hw *imx_obtain_fixed_clock_hw( 103 const char *name, unsigned long rate) 104 { 105 struct clk *clk; 106 107 clk = imx_obtain_fixed_clock_from_dt(name); 108 if (IS_ERR(clk)) 109 clk = imx_clk_fixed(name, rate); 110 return __clk_get_hw(clk); 111 } 112 113 struct clk_hw * imx_obtain_fixed_clk_hw(struct device_node *np, 114 const char *name) 115 { 116 struct clk *clk; 117 118 clk = of_clk_get_by_name(np, name); 119 if (IS_ERR(clk)) 120 return ERR_PTR(-ENOENT); 121 122 return __clk_get_hw(clk); 123 } 124 EXPORT_SYMBOL_GPL(imx_obtain_fixed_clk_hw); 125 126 /* 127 * This fixups the register CCM_CSCMR1 write value. 128 * The write/read/divider values of the aclk_podf field 129 * of that register have the relationship described by 130 * the following table: 131 * 132 * write value read value divider 133 * 3b'000 3b'110 7 134 * 3b'001 3b'111 8 135 * 3b'010 3b'100 5 136 * 3b'011 3b'101 6 137 * 3b'100 3b'010 3 138 * 3b'101 3b'011 4 139 * 3b'110 3b'000 1 140 * 3b'111 3b'001 2(default) 141 * 142 * That's why we do the xor operation below. 143 */ 144 #define CSCMR1_FIXUP 0x00600000 145 146 void imx_cscmr1_fixup(u32 *val) 147 { 148 *val ^= CSCMR1_FIXUP; 149 return; 150 } 151 152 #ifndef MODULE 153 154 static bool imx_keep_uart_clocks; 155 static int imx_enabled_uart_clocks; 156 static struct clk **imx_uart_clocks; 157 158 static int __init imx_keep_uart_clocks_param(char *str) 159 { 160 imx_keep_uart_clocks = 1; 161 162 return 0; 163 } 164 __setup_param("earlycon", imx_keep_uart_earlycon, 165 imx_keep_uart_clocks_param, 0); 166 __setup_param("earlyprintk", imx_keep_uart_earlyprintk, 167 imx_keep_uart_clocks_param, 0); 168 169 void imx_register_uart_clocks(unsigned int clk_count) 170 { 171 imx_enabled_uart_clocks = 0; 172 173 /* i.MX boards use device trees now. For build tests without CONFIG_OF, do nothing */ 174 #ifdef CONFIG_OF 175 if (imx_keep_uart_clocks) { 176 int i; 177 178 imx_uart_clocks = kcalloc(clk_count, sizeof(struct clk *), GFP_KERNEL); 179 if (!imx_uart_clocks) 180 return; 181 182 if (!of_stdout) 183 return; 184 185 for (i = 0; i < clk_count; i++) { 186 imx_uart_clocks[imx_enabled_uart_clocks] = of_clk_get(of_stdout, i); 187 188 /* Stop if there are no more of_stdout references */ 189 if (IS_ERR(imx_uart_clocks[imx_enabled_uart_clocks])) 190 return; 191 192 /* Only enable the clock if it's not NULL */ 193 if (imx_uart_clocks[imx_enabled_uart_clocks]) 194 clk_prepare_enable(imx_uart_clocks[imx_enabled_uart_clocks++]); 195 } 196 } 197 #endif 198 } 199 200 static int __init imx_clk_disable_uart(void) 201 { 202 if (imx_keep_uart_clocks && imx_enabled_uart_clocks) { 203 int i; 204 205 for (i = 0; i < imx_enabled_uart_clocks; i++) { 206 clk_disable_unprepare(imx_uart_clocks[i]); 207 clk_put(imx_uart_clocks[i]); 208 } 209 kfree(imx_uart_clocks); 210 } 211 212 return 0; 213 } 214 late_initcall_sync(imx_clk_disable_uart); 215 #endif 216 217 MODULE_LICENSE("GPL v2"); 218