1 /* 2 * Copyright (c) 2017 Lucas Stach, Pengutronix 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 */ 13 14 #include <drm/drm_fourcc.h> 15 #include <linux/clk.h> 16 #include <linux/err.h> 17 #include <linux/genalloc.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/platform_device.h> 21 #include <video/imx-ipu-v3.h> 22 23 #include "ipu-prv.h" 24 25 #define IPU_PRE_MAX_WIDTH 2048 26 #define IPU_PRE_NUM_SCANLINES 8 27 28 #define IPU_PRE_CTRL 0x000 29 #define IPU_PRE_CTRL_SET 0x004 30 #define IPU_PRE_CTRL_ENABLE (1 << 0) 31 #define IPU_PRE_CTRL_BLOCK_EN (1 << 1) 32 #define IPU_PRE_CTRL_BLOCK_16 (1 << 2) 33 #define IPU_PRE_CTRL_SDW_UPDATE (1 << 4) 34 #define IPU_PRE_CTRL_VFLIP (1 << 5) 35 #define IPU_PRE_CTRL_SO (1 << 6) 36 #define IPU_PRE_CTRL_INTERLACED_FIELD (1 << 7) 37 #define IPU_PRE_CTRL_HANDSHAKE_EN (1 << 8) 38 #define IPU_PRE_CTRL_HANDSHAKE_LINE_NUM(v) ((v & 0x3) << 9) 39 #define IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN (1 << 11) 40 #define IPU_PRE_CTRL_EN_REPEAT (1 << 28) 41 #define IPU_PRE_CTRL_TPR_REST_SEL (1 << 29) 42 #define IPU_PRE_CTRL_CLKGATE (1 << 30) 43 #define IPU_PRE_CTRL_SFTRST (1 << 31) 44 45 #define IPU_PRE_CUR_BUF 0x030 46 47 #define IPU_PRE_NEXT_BUF 0x040 48 49 #define IPU_PRE_TPR_CTRL 0x070 50 #define IPU_PRE_TPR_CTRL_TILE_FORMAT(v) ((v & 0xff) << 0) 51 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK 0xff 52 53 #define IPU_PRE_PREFETCH_ENG_CTRL 0x080 54 #define IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN (1 << 0) 55 #define IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(v) ((v & 0x7) << 1) 56 #define IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(v) ((v & 0x3) << 4) 57 #define IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(v) ((v & 0x7) << 8) 58 #define IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS (1 << 11) 59 #define IPU_PRE_PREF_ENG_CTRL_FIELD_INVERSE (1 << 12) 60 #define IPU_PRE_PREF_ENG_CTRL_PARTIAL_UV_SWAP (1 << 14) 61 #define IPU_PRE_PREF_ENG_CTRL_TPR_COOR_OFFSET_EN (1 << 15) 62 63 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE 0x0a0 64 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(v) ((v & 0xffff) << 0) 65 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(v) ((v & 0xffff) << 16) 66 67 #define IPU_PRE_PREFETCH_ENG_PITCH 0x0d0 68 #define IPU_PRE_PREFETCH_ENG_PITCH_Y(v) ((v & 0xffff) << 0) 69 #define IPU_PRE_PREFETCH_ENG_PITCH_UV(v) ((v & 0xffff) << 16) 70 71 #define IPU_PRE_STORE_ENG_CTRL 0x110 72 #define IPU_PRE_STORE_ENG_CTRL_STORE_EN (1 << 0) 73 #define IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(v) ((v & 0x7) << 1) 74 #define IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(v) ((v & 0x3) << 4) 75 76 #define IPU_PRE_STORE_ENG_SIZE 0x130 77 #define IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(v) ((v & 0xffff) << 0) 78 #define IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(v) ((v & 0xffff) << 16) 79 80 #define IPU_PRE_STORE_ENG_PITCH 0x140 81 #define IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(v) ((v & 0xffff) << 0) 82 83 #define IPU_PRE_STORE_ENG_ADDR 0x150 84 85 struct ipu_pre { 86 struct list_head list; 87 struct device *dev; 88 89 void __iomem *regs; 90 struct clk *clk_axi; 91 struct gen_pool *iram; 92 93 dma_addr_t buffer_paddr; 94 void *buffer_virt; 95 bool in_use; 96 }; 97 98 static DEFINE_MUTEX(ipu_pre_list_mutex); 99 static LIST_HEAD(ipu_pre_list); 100 static int available_pres; 101 102 int ipu_pre_get_available_count(void) 103 { 104 return available_pres; 105 } 106 107 struct ipu_pre * 108 ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index) 109 { 110 struct device_node *pre_node = of_parse_phandle(dev->of_node, 111 name, index); 112 struct ipu_pre *pre; 113 114 mutex_lock(&ipu_pre_list_mutex); 115 list_for_each_entry(pre, &ipu_pre_list, list) { 116 if (pre_node == pre->dev->of_node) { 117 mutex_unlock(&ipu_pre_list_mutex); 118 device_link_add(dev, pre->dev, DL_FLAG_AUTOREMOVE); 119 return pre; 120 } 121 } 122 mutex_unlock(&ipu_pre_list_mutex); 123 124 return NULL; 125 } 126 127 int ipu_pre_get(struct ipu_pre *pre) 128 { 129 u32 val; 130 131 if (pre->in_use) 132 return -EBUSY; 133 134 /* first get the engine out of reset and remove clock gating */ 135 writel(0, pre->regs + IPU_PRE_CTRL); 136 137 /* init defaults that should be applied to all streams */ 138 val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN | 139 IPU_PRE_CTRL_HANDSHAKE_EN | 140 IPU_PRE_CTRL_TPR_REST_SEL | 141 IPU_PRE_CTRL_BLOCK_16 | IPU_PRE_CTRL_SDW_UPDATE; 142 writel(val, pre->regs + IPU_PRE_CTRL); 143 144 pre->in_use = true; 145 return 0; 146 } 147 148 void ipu_pre_put(struct ipu_pre *pre) 149 { 150 writel(IPU_PRE_CTRL_SFTRST, pre->regs + IPU_PRE_CTRL); 151 152 pre->in_use = false; 153 } 154 155 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width, 156 unsigned int height, unsigned int stride, u32 format, 157 unsigned int bufaddr) 158 { 159 const struct drm_format_info *info = drm_format_info(format); 160 u32 active_bpp = info->cpp[0] >> 1; 161 u32 val; 162 163 writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF); 164 writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF); 165 166 val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) | 167 IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) | 168 IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(4) | 169 IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS | 170 IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN; 171 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_CTRL); 172 173 val = IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(width) | 174 IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(height); 175 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_INPUT_SIZE); 176 177 val = IPU_PRE_PREFETCH_ENG_PITCH_Y(stride); 178 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_PITCH); 179 180 val = IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(active_bpp) | 181 IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(4) | 182 IPU_PRE_STORE_ENG_CTRL_STORE_EN; 183 writel(val, pre->regs + IPU_PRE_STORE_ENG_CTRL); 184 185 val = IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(width) | 186 IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(height); 187 writel(val, pre->regs + IPU_PRE_STORE_ENG_SIZE); 188 189 val = IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(stride); 190 writel(val, pre->regs + IPU_PRE_STORE_ENG_PITCH); 191 192 writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR); 193 194 val = readl(pre->regs + IPU_PRE_CTRL); 195 val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE | 196 IPU_PRE_CTRL_SDW_UPDATE; 197 writel(val, pre->regs + IPU_PRE_CTRL); 198 } 199 200 void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr) 201 { 202 writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF); 203 writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET); 204 } 205 206 u32 ipu_pre_get_baddr(struct ipu_pre *pre) 207 { 208 return (u32)pre->buffer_paddr; 209 } 210 211 static int ipu_pre_probe(struct platform_device *pdev) 212 { 213 struct device *dev = &pdev->dev; 214 struct resource *res; 215 struct ipu_pre *pre; 216 217 pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL); 218 if (!pre) 219 return -ENOMEM; 220 221 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 222 pre->regs = devm_ioremap_resource(&pdev->dev, res); 223 if (IS_ERR(pre->regs)) 224 return PTR_ERR(pre->regs); 225 226 pre->clk_axi = devm_clk_get(dev, "axi"); 227 if (IS_ERR(pre->clk_axi)) 228 return PTR_ERR(pre->clk_axi); 229 230 pre->iram = of_gen_pool_get(dev->of_node, "fsl,iram", 0); 231 if (!pre->iram) 232 return -EPROBE_DEFER; 233 234 /* 235 * Allocate IRAM buffer with maximum size. This could be made dynamic, 236 * but as there is no other user of this IRAM region and we can fit all 237 * max sized buffers into it, there is no need yet. 238 */ 239 pre->buffer_virt = gen_pool_dma_alloc(pre->iram, IPU_PRE_MAX_WIDTH * 240 IPU_PRE_NUM_SCANLINES * 4, 241 &pre->buffer_paddr); 242 if (!pre->buffer_virt) 243 return -ENOMEM; 244 245 clk_prepare_enable(pre->clk_axi); 246 247 pre->dev = dev; 248 platform_set_drvdata(pdev, pre); 249 mutex_lock(&ipu_pre_list_mutex); 250 list_add(&pre->list, &ipu_pre_list); 251 available_pres++; 252 mutex_unlock(&ipu_pre_list_mutex); 253 254 return 0; 255 } 256 257 static int ipu_pre_remove(struct platform_device *pdev) 258 { 259 struct ipu_pre *pre = platform_get_drvdata(pdev); 260 261 mutex_lock(&ipu_pre_list_mutex); 262 list_del(&pre->list); 263 available_pres--; 264 mutex_unlock(&ipu_pre_list_mutex); 265 266 clk_disable_unprepare(pre->clk_axi); 267 268 if (pre->buffer_virt) 269 gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt, 270 IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4); 271 return 0; 272 } 273 274 static const struct of_device_id ipu_pre_dt_ids[] = { 275 { .compatible = "fsl,imx6qp-pre", }, 276 { /* sentinel */ }, 277 }; 278 279 struct platform_driver ipu_pre_drv = { 280 .probe = ipu_pre_probe, 281 .remove = ipu_pre_remove, 282 .driver = { 283 .name = "imx-ipu-pre", 284 .of_match_table = ipu_pre_dt_ids, 285 }, 286 }; 287