1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net> */ 3 4 5 #include <linux/bitfield.h> 6 #include <linux/component.h> 7 #include <linux/device.h> 8 #include <linux/io.h> 9 #include <linux/module.h> 10 #include <linux/of_device.h> 11 #include <linux/of_graph.h> 12 #include <linux/platform_device.h> 13 14 #include <dt-bindings/clock/sun8i-tcon-top.h> 15 16 #include "sun8i_tcon_top.h" 17 18 struct sun8i_tcon_top_quirks { 19 bool has_tcon_tv1; 20 bool has_dsi; 21 }; 22 23 static bool sun8i_tcon_top_node_is_tcon_top(struct device_node *node) 24 { 25 return !!of_match_node(sun8i_tcon_top_of_table, node); 26 } 27 28 int sun8i_tcon_top_set_hdmi_src(struct device *dev, int tcon) 29 { 30 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev); 31 unsigned long flags; 32 u32 val; 33 34 if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) { 35 dev_err(dev, "Device is not TCON TOP!\n"); 36 return -EINVAL; 37 } 38 39 if (tcon < 2 || tcon > 3) { 40 dev_err(dev, "TCON index must be 2 or 3!\n"); 41 return -EINVAL; 42 } 43 44 spin_lock_irqsave(&tcon_top->reg_lock, flags); 45 46 val = readl(tcon_top->regs + TCON_TOP_GATE_SRC_REG); 47 val &= ~TCON_TOP_HDMI_SRC_MSK; 48 val |= FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, tcon - 1); 49 writel(val, tcon_top->regs + TCON_TOP_GATE_SRC_REG); 50 51 spin_unlock_irqrestore(&tcon_top->reg_lock, flags); 52 53 return 0; 54 } 55 EXPORT_SYMBOL(sun8i_tcon_top_set_hdmi_src); 56 57 int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon) 58 { 59 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev); 60 unsigned long flags; 61 u32 reg; 62 63 if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) { 64 dev_err(dev, "Device is not TCON TOP!\n"); 65 return -EINVAL; 66 } 67 68 if (mixer > 1) { 69 dev_err(dev, "Mixer index is too high!\n"); 70 return -EINVAL; 71 } 72 73 if (tcon > 3) { 74 dev_err(dev, "TCON index is too high!\n"); 75 return -EINVAL; 76 } 77 78 spin_lock_irqsave(&tcon_top->reg_lock, flags); 79 80 reg = readl(tcon_top->regs + TCON_TOP_PORT_SEL_REG); 81 if (mixer == 0) { 82 reg &= ~TCON_TOP_PORT_DE0_MSK; 83 reg |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, tcon); 84 } else { 85 reg &= ~TCON_TOP_PORT_DE1_MSK; 86 reg |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, tcon); 87 } 88 writel(reg, tcon_top->regs + TCON_TOP_PORT_SEL_REG); 89 90 spin_unlock_irqrestore(&tcon_top->reg_lock, flags); 91 92 return 0; 93 } 94 EXPORT_SYMBOL(sun8i_tcon_top_de_config); 95 96 97 static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev, 98 const char *parent, 99 void __iomem *regs, 100 spinlock_t *lock, 101 u8 bit, int name_index) 102 { 103 const char *clk_name, *parent_name; 104 int ret, index; 105 106 index = of_property_match_string(dev->of_node, "clock-names", parent); 107 if (index < 0) 108 return ERR_PTR(index); 109 110 parent_name = of_clk_get_parent_name(dev->of_node, index); 111 112 ret = of_property_read_string_index(dev->of_node, 113 "clock-output-names", name_index, 114 &clk_name); 115 if (ret) 116 return ERR_PTR(ret); 117 118 return clk_hw_register_gate(dev, clk_name, parent_name, 119 CLK_SET_RATE_PARENT, 120 regs + TCON_TOP_GATE_SRC_REG, 121 bit, 0, lock); 122 }; 123 124 static int sun8i_tcon_top_bind(struct device *dev, struct device *master, 125 void *data) 126 { 127 struct platform_device *pdev = to_platform_device(dev); 128 struct clk_hw_onecell_data *clk_data; 129 struct sun8i_tcon_top *tcon_top; 130 const struct sun8i_tcon_top_quirks *quirks; 131 struct resource *res; 132 void __iomem *regs; 133 int ret, i; 134 135 quirks = of_device_get_match_data(&pdev->dev); 136 137 tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL); 138 if (!tcon_top) 139 return -ENOMEM; 140 141 clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, CLK_NUM), 142 GFP_KERNEL); 143 if (!clk_data) 144 return -ENOMEM; 145 tcon_top->clk_data = clk_data; 146 147 spin_lock_init(&tcon_top->reg_lock); 148 149 tcon_top->rst = devm_reset_control_get(dev, NULL); 150 if (IS_ERR(tcon_top->rst)) { 151 dev_err(dev, "Couldn't get our reset line\n"); 152 return PTR_ERR(tcon_top->rst); 153 } 154 155 tcon_top->bus = devm_clk_get(dev, "bus"); 156 if (IS_ERR(tcon_top->bus)) { 157 dev_err(dev, "Couldn't get the bus clock\n"); 158 return PTR_ERR(tcon_top->bus); 159 } 160 161 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 162 regs = devm_ioremap_resource(dev, res); 163 tcon_top->regs = regs; 164 if (IS_ERR(regs)) 165 return PTR_ERR(regs); 166 167 ret = reset_control_deassert(tcon_top->rst); 168 if (ret) { 169 dev_err(dev, "Could not deassert ctrl reset control\n"); 170 return ret; 171 } 172 173 ret = clk_prepare_enable(tcon_top->bus); 174 if (ret) { 175 dev_err(dev, "Could not enable bus clock\n"); 176 goto err_assert_reset; 177 } 178 179 /* 180 * At least on H6, some registers have some bits set by default 181 * which may cause issues. Clear them here. 182 */ 183 writel(0, regs + TCON_TOP_PORT_SEL_REG); 184 writel(0, regs + TCON_TOP_GATE_SRC_REG); 185 186 /* 187 * TCON TOP has two muxes, which select parent clock for each TCON TV 188 * channel clock. Parent could be either TCON TV or TVE clock. For now 189 * we leave this fixed to TCON TV, since TVE driver for R40 is not yet 190 * implemented. Once it is, graph needs to be traversed to determine 191 * if TVE is active on each TCON TV. If it is, mux should be switched 192 * to TVE clock parent. 193 */ 194 clk_data->hws[CLK_TCON_TOP_TV0] = 195 sun8i_tcon_top_register_gate(dev, "tcon-tv0", regs, 196 &tcon_top->reg_lock, 197 TCON_TOP_TCON_TV0_GATE, 0); 198 199 if (quirks->has_tcon_tv1) 200 clk_data->hws[CLK_TCON_TOP_TV1] = 201 sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs, 202 &tcon_top->reg_lock, 203 TCON_TOP_TCON_TV1_GATE, 1); 204 205 if (quirks->has_dsi) 206 clk_data->hws[CLK_TCON_TOP_DSI] = 207 sun8i_tcon_top_register_gate(dev, "dsi", regs, 208 &tcon_top->reg_lock, 209 TCON_TOP_TCON_DSI_GATE, 2); 210 211 for (i = 0; i < CLK_NUM; i++) 212 if (IS_ERR(clk_data->hws[i])) { 213 ret = PTR_ERR(clk_data->hws[i]); 214 goto err_unregister_gates; 215 } 216 217 clk_data->num = CLK_NUM; 218 219 ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get, 220 clk_data); 221 if (ret) 222 goto err_unregister_gates; 223 224 dev_set_drvdata(dev, tcon_top); 225 226 return 0; 227 228 err_unregister_gates: 229 for (i = 0; i < CLK_NUM; i++) 230 if (!IS_ERR_OR_NULL(clk_data->hws[i])) 231 clk_hw_unregister_gate(clk_data->hws[i]); 232 clk_disable_unprepare(tcon_top->bus); 233 err_assert_reset: 234 reset_control_assert(tcon_top->rst); 235 236 return ret; 237 } 238 239 static void sun8i_tcon_top_unbind(struct device *dev, struct device *master, 240 void *data) 241 { 242 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev); 243 struct clk_hw_onecell_data *clk_data = tcon_top->clk_data; 244 int i; 245 246 of_clk_del_provider(dev->of_node); 247 for (i = 0; i < CLK_NUM; i++) 248 if (clk_data->hws[i]) 249 clk_hw_unregister_gate(clk_data->hws[i]); 250 251 clk_disable_unprepare(tcon_top->bus); 252 reset_control_assert(tcon_top->rst); 253 } 254 255 static const struct component_ops sun8i_tcon_top_ops = { 256 .bind = sun8i_tcon_top_bind, 257 .unbind = sun8i_tcon_top_unbind, 258 }; 259 260 static int sun8i_tcon_top_probe(struct platform_device *pdev) 261 { 262 return component_add(&pdev->dev, &sun8i_tcon_top_ops); 263 } 264 265 static int sun8i_tcon_top_remove(struct platform_device *pdev) 266 { 267 component_del(&pdev->dev, &sun8i_tcon_top_ops); 268 269 return 0; 270 } 271 272 static const struct sun8i_tcon_top_quirks sun8i_r40_tcon_top_quirks = { 273 .has_tcon_tv1 = true, 274 .has_dsi = true, 275 }; 276 277 static const struct sun8i_tcon_top_quirks sun50i_h6_tcon_top_quirks = { 278 /* Nothing special */ 279 }; 280 281 /* sun4i_drv uses this list to check if a device node is a TCON TOP */ 282 const struct of_device_id sun8i_tcon_top_of_table[] = { 283 { 284 .compatible = "allwinner,sun8i-r40-tcon-top", 285 .data = &sun8i_r40_tcon_top_quirks 286 }, 287 { 288 .compatible = "allwinner,sun50i-h6-tcon-top", 289 .data = &sun50i_h6_tcon_top_quirks 290 }, 291 { /* sentinel */ } 292 }; 293 MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table); 294 EXPORT_SYMBOL(sun8i_tcon_top_of_table); 295 296 static struct platform_driver sun8i_tcon_top_platform_driver = { 297 .probe = sun8i_tcon_top_probe, 298 .remove = sun8i_tcon_top_remove, 299 .driver = { 300 .name = "sun8i-tcon-top", 301 .of_match_table = sun8i_tcon_top_of_table, 302 }, 303 }; 304 module_platform_driver(sun8i_tcon_top_platform_driver); 305 306 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>"); 307 MODULE_DESCRIPTION("Allwinner R40 TCON TOP driver"); 308 MODULE_LICENSE("GPL"); 309