2 * Copyright (c) 2016-2017 Lucas Stach, Pengutronix
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.
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
14 #include <drm/drm_fourcc.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
19 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <video/imx-ipu-v3.h>
27 #define IPU_PRG_CTL 0x00
28 #define IPU_PRG_CTL_BYPASS(i) (1 << (0 + i))
29 #define IPU_PRG_CTL_SOFT_ARID_MASK 0x3
30 #define IPU_PRG_CTL_SOFT_ARID_SHIFT(i) (8 + i * 2)
31 #define IPU_PRG_CTL_SOFT_ARID(i, v) ((v & 0x3) << (8 + 2 * i))
32 #define IPU_PRG_CTL_SO(i) (1 << (16 + i))
33 #define IPU_PRG_CTL_VFLIP(i) (1 << (19 + i))
34 #define IPU_PRG_CTL_BLOCK_MODE(i) (1 << (22 + i))
35 #define IPU_PRG_CTL_CNT_LOAD_EN(i) (1 << (25 + i))
36 #define IPU_PRG_CTL_SOFTRST (1 << 30)
37 #define IPU_PRG_CTL_SHADOW_EN (1 << 31)
39 #define IPU_PRG_STATUS 0x04
40 #define IPU_PRG_STATUS_BUFFER0_READY(i) (1 << (0 + i * 2))
41 #define IPU_PRG_STATUS_BUFFER1_READY(i) (1 << (1 + i * 2))
43 #define IPU_PRG_QOS 0x08
44 #define IPU_PRG_QOS_ARID_MASK 0xf
45 #define IPU_PRG_QOS_ARID_SHIFT(i) (0 + i * 4)
47 #define IPU_PRG_REG_UPDATE 0x0c
48 #define IPU_PRG_REG_UPDATE_REG_UPDATE (1 << 0)
50 #define IPU_PRG_STRIDE(i) (0x10 + i * 0x4)
51 #define IPU_PRG_STRIDE_STRIDE_MASK 0x3fff
53 #define IPU_PRG_CROP_LINE 0x1c
55 #define IPU_PRG_THD 0x20
57 #define IPU_PRG_BADDR(i) (0x24 + i * 0x4)
59 #define IPU_PRG_OFFSET(i) (0x30 + i * 0x4)
61 #define IPU_PRG_ILO(i) (0x3c + i * 0x4)
63 #define IPU_PRG_HEIGHT(i) (0x48 + i * 0x4)
64 #define IPU_PRG_HEIGHT_PRE_HEIGHT_MASK 0xfff
65 #define IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT 0
66 #define IPU_PRG_HEIGHT_IPU_HEIGHT_MASK 0xfff
67 #define IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT 16
69 struct ipu_prg_channel {
75 struct list_head list;
80 struct clk *clk_ipg, *clk_axi;
81 struct regmap *iomuxc_gpr;
82 struct ipu_pre *pres[3];
84 struct ipu_prg_channel chan[3];
87 static DEFINE_MUTEX(ipu_prg_list_mutex);
88 static LIST_HEAD(ipu_prg_list);
91 ipu_prg_lookup_by_phandle(struct device *dev, const char *name, int ipu_id)
93 struct device_node *prg_node = of_parse_phandle(dev->of_node,
97 mutex_lock(&ipu_prg_list_mutex);
98 list_for_each_entry(prg, &ipu_prg_list, list) {
99 if (prg_node == prg->dev->of_node) {
100 mutex_unlock(&ipu_prg_list_mutex);
101 device_link_add(dev, prg->dev, DL_FLAG_AUTOREMOVE);
106 mutex_unlock(&ipu_prg_list_mutex);
111 int ipu_prg_max_active_channels(void)
113 return ipu_pre_get_available_count();
115 EXPORT_SYMBOL_GPL(ipu_prg_max_active_channels);
117 bool ipu_prg_present(struct ipu_soc *ipu)
124 EXPORT_SYMBOL_GPL(ipu_prg_present);
126 bool ipu_prg_format_supported(struct ipu_soc *ipu, uint32_t format,
129 const struct drm_format_info *info = drm_format_info(format);
131 if (info->num_planes != 1)
136 EXPORT_SYMBOL_GPL(ipu_prg_format_supported);
138 int ipu_prg_enable(struct ipu_soc *ipu)
140 struct ipu_prg *prg = ipu->prg_priv;
146 ret = clk_prepare_enable(prg->clk_axi);
148 goto fail_disable_ipg;
153 clk_disable_unprepare(prg->clk_ipg);
157 EXPORT_SYMBOL_GPL(ipu_prg_enable);
159 void ipu_prg_disable(struct ipu_soc *ipu)
161 struct ipu_prg *prg = ipu->prg_priv;
166 clk_disable_unprepare(prg->clk_axi);
168 EXPORT_SYMBOL_GPL(ipu_prg_disable);
171 * The channel configuartion functions below are not thread safe, as they
172 * must be only called from the atomic commit path in the DRM driver, which
173 * is properly serialized.
175 static int ipu_prg_ipu_to_prg_chan(int ipu_chan)
178 * This isn't clearly documented in the RM, but IPU to PRG channel
179 * assignment is fixed, as only with this mapping the control signals
183 case IPUV3_CHANNEL_MEM_BG_SYNC:
185 case IPUV3_CHANNEL_MEM_FG_SYNC:
187 case IPUV3_CHANNEL_MEM_DC_SYNC:
194 static int ipu_prg_get_pre(struct ipu_prg *prg, int prg_chan)
198 /* channel 0 is special as it is hardwired to one of the PREs */
200 ret = ipu_pre_get(prg->pres[0]);
203 prg->chan[prg_chan].used_pre = 0;
207 for (i = 1; i < 3; i++) {
208 ret = ipu_pre_get(prg->pres[i]);
213 prg->chan[prg_chan].used_pre = i;
215 /* configure the PRE to PRG channel mux */
216 shift = (i == 1) ? 12 : 14;
217 mux = (prg->id << 1) | (prg_chan - 1);
218 regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
219 0x3 << shift, mux << shift);
221 /* check other mux, must not point to same channel */
222 shift = (i == 1) ? 14 : 12;
223 regmap_read(prg->iomuxc_gpr, IOMUXC_GPR5, &val);
224 if (((val >> shift) & 0x3) == mux) {
225 regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
227 (mux ^ 0x1) << shift);
235 dev_err(prg->dev, "could not get PRE for PRG chan %d", prg_chan);
239 static void ipu_prg_put_pre(struct ipu_prg *prg, int prg_chan)
241 struct ipu_prg_channel *chan = &prg->chan[prg_chan];
243 ipu_pre_put(prg->pres[chan->used_pre]);
247 void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan)
249 int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
250 struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
251 struct ipu_prg_channel *chan = &prg->chan[prg_chan];
254 if (!chan->enabled || prg_chan < 0)
257 clk_prepare_enable(prg->clk_ipg);
259 val = readl(prg->regs + IPU_PRG_CTL);
260 val |= IPU_PRG_CTL_BYPASS(prg_chan);
261 writel(val, prg->regs + IPU_PRG_CTL);
263 val = IPU_PRG_REG_UPDATE_REG_UPDATE;
264 writel(val, prg->regs + IPU_PRG_REG_UPDATE);
266 clk_disable_unprepare(prg->clk_ipg);
268 ipu_prg_put_pre(prg, prg_chan);
270 chan->enabled = false;
272 EXPORT_SYMBOL_GPL(ipu_prg_channel_disable);
274 int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
275 unsigned int axi_id, unsigned int width,
276 unsigned int height, unsigned int stride,
277 u32 format, unsigned long *eba)
279 int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
280 struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
281 struct ipu_prg_channel *chan = &prg->chan[prg_chan];
289 ipu_pre_update(prg->pres[chan->used_pre], *eba);
293 ret = ipu_prg_get_pre(prg, prg_chan);
297 ipu_pre_configure(prg->pres[chan->used_pre],
298 width, height, stride, format, *eba);
301 ret = clk_prepare_enable(prg->clk_ipg);
303 ipu_prg_put_pre(prg, prg_chan);
307 val = (stride - 1) & IPU_PRG_STRIDE_STRIDE_MASK;
308 writel(val, prg->regs + IPU_PRG_STRIDE(prg_chan));
310 val = ((height & IPU_PRG_HEIGHT_PRE_HEIGHT_MASK) <<
311 IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT) |
312 ((height & IPU_PRG_HEIGHT_IPU_HEIGHT_MASK) <<
313 IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT);
314 writel(val, prg->regs + IPU_PRG_HEIGHT(prg_chan));
316 val = ipu_pre_get_baddr(prg->pres[chan->used_pre]);
318 writel(val, prg->regs + IPU_PRG_BADDR(prg_chan));
320 val = readl(prg->regs + IPU_PRG_CTL);
321 /* counter load enable */
322 val |= IPU_PRG_CTL_CNT_LOAD_EN(prg_chan);
324 val &= ~(IPU_PRG_CTL_SOFT_ARID_MASK <<
325 IPU_PRG_CTL_SOFT_ARID_SHIFT(prg_chan));
326 val |= IPU_PRG_CTL_SOFT_ARID(prg_chan, axi_id);
328 val &= ~IPU_PRG_CTL_BYPASS(prg_chan);
329 writel(val, prg->regs + IPU_PRG_CTL);
331 val = IPU_PRG_REG_UPDATE_REG_UPDATE;
332 writel(val, prg->regs + IPU_PRG_REG_UPDATE);
334 clk_disable_unprepare(prg->clk_ipg);
336 chan->enabled = true;
339 EXPORT_SYMBOL_GPL(ipu_prg_channel_configure);
341 static int ipu_prg_probe(struct platform_device *pdev)
343 struct device *dev = &pdev->dev;
344 struct resource *res;
349 prg = devm_kzalloc(dev, sizeof(*prg), GFP_KERNEL);
353 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
354 prg->regs = devm_ioremap_resource(&pdev->dev, res);
355 if (IS_ERR(prg->regs))
356 return PTR_ERR(prg->regs);
359 prg->clk_ipg = devm_clk_get(dev, "ipg");
360 if (IS_ERR(prg->clk_ipg))
361 return PTR_ERR(prg->clk_ipg);
363 prg->clk_axi = devm_clk_get(dev, "axi");
364 if (IS_ERR(prg->clk_axi))
365 return PTR_ERR(prg->clk_axi);
368 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
369 if (IS_ERR(prg->iomuxc_gpr))
370 return PTR_ERR(prg->iomuxc_gpr);
372 for (i = 0; i < 3; i++) {
373 prg->pres[i] = ipu_pre_lookup_by_phandle(dev, "fsl,pres", i);
375 return -EPROBE_DEFER;
378 ret = clk_prepare_enable(prg->clk_ipg);
382 /* init to free running mode */
383 val = readl(prg->regs + IPU_PRG_CTL);
384 val |= IPU_PRG_CTL_SHADOW_EN;
385 writel(val, prg->regs + IPU_PRG_CTL);
387 /* disable address threshold */
388 writel(0xffffffff, prg->regs + IPU_PRG_THD);
390 clk_disable_unprepare(prg->clk_ipg);
393 platform_set_drvdata(pdev, prg);
394 mutex_lock(&ipu_prg_list_mutex);
395 list_add(&prg->list, &ipu_prg_list);
396 mutex_unlock(&ipu_prg_list_mutex);
401 static int ipu_prg_remove(struct platform_device *pdev)
403 struct ipu_prg *prg = platform_get_drvdata(pdev);
405 mutex_lock(&ipu_prg_list_mutex);
406 list_del(&prg->list);
407 mutex_unlock(&ipu_prg_list_mutex);
412 static const struct of_device_id ipu_prg_dt_ids[] = {
413 { .compatible = "fsl,imx6qp-prg", },
417 struct platform_driver ipu_prg_drv = {
418 .probe = ipu_prg_probe,
419 .remove = ipu_prg_remove,
421 .name = "imx-ipu-prg",
422 .of_match_table = ipu_prg_dt_ids,