1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com> 7 * Copyright (C) 2011 John Crispin <blogic@openwrt.org> 8 */ 9 10 #include <linux/ioport.h> 11 #include <linux/export.h> 12 #include <linux/clkdev.h> 13 #include <linux/of_address.h> 14 #include <asm/delay.h> 15 16 #include <lantiq_soc.h> 17 18 #include "../clk.h" 19 20 /* infrastructure control register */ 21 #define SYS1_INFRAC 0x00bc 22 /* Configuration fuses for drivers and pll */ 23 #define STATUS_CONFIG 0x0040 24 25 /* GPE frequency selection */ 26 #define GPPC_OFFSET 24 27 #define GPEFREQ_MASK 0x00000C0 28 #define GPEFREQ_OFFSET 10 29 /* Clock status register */ 30 #define SYSCTL_CLKS 0x0000 31 /* Clock enable register */ 32 #define SYSCTL_CLKEN 0x0004 33 /* Clock clear register */ 34 #define SYSCTL_CLKCLR 0x0008 35 /* Activation Status Register */ 36 #define SYSCTL_ACTS 0x0020 37 /* Activation Register */ 38 #define SYSCTL_ACT 0x0024 39 /* Deactivation Register */ 40 #define SYSCTL_DEACT 0x0028 41 /* reboot Register */ 42 #define SYSCTL_RBT 0x002c 43 /* CPU0 Clock Control Register */ 44 #define SYS1_CPU0CC 0x0040 45 /* HRST_OUT_N Control Register */ 46 #define SYS1_HRSTOUTC 0x00c0 47 /* clock divider bit */ 48 #define CPU0CC_CPUDIV 0x0001 49 50 /* Activation Status Register */ 51 #define ACTS_ASC0_ACT 0x00001000 52 #define ACTS_ASC1_ACT 0x00000800 53 #define ACTS_I2C_ACT 0x00004000 54 #define ACTS_P0 0x00010000 55 #define ACTS_P1 0x00010000 56 #define ACTS_P2 0x00020000 57 #define ACTS_P3 0x00020000 58 #define ACTS_P4 0x00040000 59 #define ACTS_PADCTRL0 0x00100000 60 #define ACTS_PADCTRL1 0x00100000 61 #define ACTS_PADCTRL2 0x00200000 62 #define ACTS_PADCTRL3 0x00200000 63 #define ACTS_PADCTRL4 0x00400000 64 65 #define sysctl_w32(m, x, y) ltq_w32((x), sysctl_membase[m] + (y)) 66 #define sysctl_r32(m, x) ltq_r32(sysctl_membase[m] + (x)) 67 #define sysctl_w32_mask(m, clear, set, reg) \ 68 sysctl_w32(m, (sysctl_r32(m, reg) & ~(clear)) | (set), reg) 69 70 #define status_w32(x, y) ltq_w32((x), status_membase + (y)) 71 #define status_r32(x) ltq_r32(status_membase + (x)) 72 73 static void __iomem *sysctl_membase[3], *status_membase; 74 void __iomem *ltq_sys1_membase, *ltq_ebu_membase; 75 76 void falcon_trigger_hrst(int level) 77 { 78 sysctl_w32(SYSCTL_SYS1, level & 1, SYS1_HRSTOUTC); 79 } 80 81 static inline void sysctl_wait(struct clk *clk, 82 unsigned int test, unsigned int reg) 83 { 84 int err = 1000000; 85 86 do {} while (--err && ((sysctl_r32(clk->module, reg) 87 & clk->bits) != test)); 88 if (!err) 89 pr_err("module de/activation failed %d %08X %08X %08X\n", 90 clk->module, clk->bits, test, 91 sysctl_r32(clk->module, reg) & clk->bits); 92 } 93 94 static int sysctl_activate(struct clk *clk) 95 { 96 sysctl_w32(clk->module, clk->bits, SYSCTL_CLKEN); 97 sysctl_w32(clk->module, clk->bits, SYSCTL_ACT); 98 sysctl_wait(clk, clk->bits, SYSCTL_ACTS); 99 return 0; 100 } 101 102 static void sysctl_deactivate(struct clk *clk) 103 { 104 sysctl_w32(clk->module, clk->bits, SYSCTL_CLKCLR); 105 sysctl_w32(clk->module, clk->bits, SYSCTL_DEACT); 106 sysctl_wait(clk, 0, SYSCTL_ACTS); 107 } 108 109 static int sysctl_clken(struct clk *clk) 110 { 111 sysctl_w32(clk->module, clk->bits, SYSCTL_CLKEN); 112 sysctl_w32(clk->module, clk->bits, SYSCTL_ACT); 113 sysctl_wait(clk, clk->bits, SYSCTL_CLKS); 114 return 0; 115 } 116 117 static void sysctl_clkdis(struct clk *clk) 118 { 119 sysctl_w32(clk->module, clk->bits, SYSCTL_CLKCLR); 120 sysctl_wait(clk, 0, SYSCTL_CLKS); 121 } 122 123 static void sysctl_reboot(struct clk *clk) 124 { 125 unsigned int act; 126 unsigned int bits; 127 128 act = sysctl_r32(clk->module, SYSCTL_ACT); 129 bits = ~act & clk->bits; 130 if (bits != 0) { 131 sysctl_w32(clk->module, bits, SYSCTL_CLKEN); 132 sysctl_w32(clk->module, bits, SYSCTL_ACT); 133 sysctl_wait(clk, bits, SYSCTL_ACTS); 134 } 135 sysctl_w32(clk->module, act & clk->bits, SYSCTL_RBT); 136 sysctl_wait(clk, clk->bits, SYSCTL_ACTS); 137 } 138 139 /* enable the ONU core */ 140 static void falcon_gpe_enable(void) 141 { 142 unsigned int freq; 143 unsigned int status; 144 145 /* if if the clock is already enabled */ 146 status = sysctl_r32(SYSCTL_SYS1, SYS1_INFRAC); 147 if (status & (1 << (GPPC_OFFSET + 1))) 148 return; 149 150 if (status_r32(STATUS_CONFIG) == 0) 151 freq = 1; /* use 625MHz on unfused chip */ 152 else 153 freq = (status_r32(STATUS_CONFIG) & 154 GPEFREQ_MASK) >> 155 GPEFREQ_OFFSET; 156 157 /* apply new frequency */ 158 sysctl_w32_mask(SYSCTL_SYS1, 7 << (GPPC_OFFSET + 1), 159 freq << (GPPC_OFFSET + 2) , SYS1_INFRAC); 160 udelay(1); 161 162 /* enable new frequency */ 163 sysctl_w32_mask(SYSCTL_SYS1, 0, 1 << (GPPC_OFFSET + 1), SYS1_INFRAC); 164 udelay(1); 165 } 166 167 static inline void clkdev_add_sys(const char *dev, unsigned int module, 168 unsigned int bits) 169 { 170 struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 171 172 clk->cl.dev_id = dev; 173 clk->cl.con_id = NULL; 174 clk->cl.clk = clk; 175 clk->module = module; 176 clk->bits = bits; 177 clk->activate = sysctl_activate; 178 clk->deactivate = sysctl_deactivate; 179 clk->enable = sysctl_clken; 180 clk->disable = sysctl_clkdis; 181 clk->reboot = sysctl_reboot; 182 clkdev_add(&clk->cl); 183 } 184 185 void __init ltq_soc_init(void) 186 { 187 struct device_node *np_status = 188 of_find_compatible_node(NULL, NULL, "lantiq,status-falcon"); 189 struct device_node *np_ebu = 190 of_find_compatible_node(NULL, NULL, "lantiq,ebu-falcon"); 191 struct device_node *np_sys1 = 192 of_find_compatible_node(NULL, NULL, "lantiq,sys1-falcon"); 193 struct device_node *np_syseth = 194 of_find_compatible_node(NULL, NULL, "lantiq,syseth-falcon"); 195 struct device_node *np_sysgpe = 196 of_find_compatible_node(NULL, NULL, "lantiq,sysgpe-falcon"); 197 struct resource res_status, res_ebu, res_sys[3]; 198 int i; 199 200 /* check if all the core register ranges are available */ 201 if (!np_status || !np_ebu || !np_sys1 || !np_syseth || !np_sysgpe) 202 panic("Failed to load core nodes from devicetree"); 203 204 if (of_address_to_resource(np_status, 0, &res_status) || 205 of_address_to_resource(np_ebu, 0, &res_ebu) || 206 of_address_to_resource(np_sys1, 0, &res_sys[0]) || 207 of_address_to_resource(np_syseth, 0, &res_sys[1]) || 208 of_address_to_resource(np_sysgpe, 0, &res_sys[2])) 209 panic("Failed to get core resources"); 210 211 if ((request_mem_region(res_status.start, resource_size(&res_status), 212 res_status.name) < 0) || 213 (request_mem_region(res_ebu.start, resource_size(&res_ebu), 214 res_ebu.name) < 0) || 215 (request_mem_region(res_sys[0].start, 216 resource_size(&res_sys[0]), 217 res_sys[0].name) < 0) || 218 (request_mem_region(res_sys[1].start, 219 resource_size(&res_sys[1]), 220 res_sys[1].name) < 0) || 221 (request_mem_region(res_sys[2].start, 222 resource_size(&res_sys[2]), 223 res_sys[2].name) < 0)) 224 pr_err("Failed to request core reources"); 225 226 status_membase = ioremap_nocache(res_status.start, 227 resource_size(&res_status)); 228 ltq_ebu_membase = ioremap_nocache(res_ebu.start, 229 resource_size(&res_ebu)); 230 231 if (!status_membase || !ltq_ebu_membase) 232 panic("Failed to remap core resources"); 233 234 for (i = 0; i < 3; i++) { 235 sysctl_membase[i] = ioremap_nocache(res_sys[i].start, 236 resource_size(&res_sys[i])); 237 if (!sysctl_membase[i]) 238 panic("Failed to remap sysctrl resources"); 239 } 240 ltq_sys1_membase = sysctl_membase[0]; 241 242 falcon_gpe_enable(); 243 244 /* get our 3 static rates for cpu, fpi and io clocks */ 245 if (ltq_sys1_r32(SYS1_CPU0CC) & CPU0CC_CPUDIV) 246 clkdev_add_static(CLOCK_200M, CLOCK_100M, CLOCK_200M, 0); 247 else 248 clkdev_add_static(CLOCK_400M, CLOCK_100M, CLOCK_200M, 0); 249 250 /* add our clock domains */ 251 clkdev_add_sys("1d810000.gpio", SYSCTL_SYSETH, ACTS_P0); 252 clkdev_add_sys("1d810100.gpio", SYSCTL_SYSETH, ACTS_P2); 253 clkdev_add_sys("1e800100.gpio", SYSCTL_SYS1, ACTS_P1); 254 clkdev_add_sys("1e800200.gpio", SYSCTL_SYS1, ACTS_P3); 255 clkdev_add_sys("1e800300.gpio", SYSCTL_SYS1, ACTS_P4); 256 clkdev_add_sys("1db01000.pad", SYSCTL_SYSETH, ACTS_PADCTRL0); 257 clkdev_add_sys("1db02000.pad", SYSCTL_SYSETH, ACTS_PADCTRL2); 258 clkdev_add_sys("1e800400.pad", SYSCTL_SYS1, ACTS_PADCTRL1); 259 clkdev_add_sys("1e800500.pad", SYSCTL_SYS1, ACTS_PADCTRL3); 260 clkdev_add_sys("1e800600.pad", SYSCTL_SYS1, ACTS_PADCTRL4); 261 clkdev_add_sys("1e100b00.serial", SYSCTL_SYS1, ACTS_ASC1_ACT); 262 clkdev_add_sys("1e100c00.serial", SYSCTL_SYS1, ACTS_ASC0_ACT); 263 clkdev_add_sys("1e200000.i2c", SYSCTL_SYS1, ACTS_I2C_ACT); 264 } 265