2 * Copyright (c) 2015-2016 MediaTek Inc.
3 * Author: Yong Wu <yong.wu@mediatek.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 #include <linux/clk.h>
15 #include <linux/component.h>
16 #include <linux/device.h>
17 #include <linux/err.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <soc/mediatek/smi.h>
24 #include <dt-bindings/memory/mt2701-larb-port.h>
26 #define SMI_LARB_MMU_EN 0xf00
27 #define REG_SMI_SECUR_CON_BASE 0x5c0
29 /* every register control 8 port, register offset 0x4 */
30 #define REG_SMI_SECUR_CON_OFFSET(id) (((id) >> 3) << 2)
31 #define REG_SMI_SECUR_CON_ADDR(id) \
32 (REG_SMI_SECUR_CON_BASE + REG_SMI_SECUR_CON_OFFSET(id))
35 * every port have 4 bit to control, bit[port + 3] control virtual or physical,
36 * bit[port + 2 : port + 1] control the domain, bit[port] control the security
39 #define SMI_SECUR_CON_VAL_MSK(id) (~(0xf << (((id) & 0x7) << 2)))
40 #define SMI_SECUR_CON_VAL_VIRT(id) BIT((((id) & 0x7) << 2) + 3)
41 /* mt2701 domain should be set to 3 */
42 #define SMI_SECUR_CON_VAL_DOMAIN(id) (0x3 << ((((id) & 0x7) << 2) + 1))
44 struct mtk_smi_larb_gen {
45 int port_in_larb[MTK_LARB_NR_MAX + 1];
46 void (*config_port)(struct device *);
51 struct clk *clk_apb, *clk_smi;
52 struct clk *clk_async; /*only needed by mt2701*/
53 void __iomem *smi_ao_base;
56 struct mtk_smi_larb { /* larb: local arbiter */
59 struct device *smi_common_dev;
60 const struct mtk_smi_larb_gen *larb_gen;
70 static int mtk_smi_enable(const struct mtk_smi *smi)
74 ret = pm_runtime_get_sync(smi->dev);
78 ret = clk_prepare_enable(smi->clk_apb);
82 ret = clk_prepare_enable(smi->clk_smi);
89 clk_disable_unprepare(smi->clk_apb);
91 pm_runtime_put_sync(smi->dev);
95 static void mtk_smi_disable(const struct mtk_smi *smi)
97 clk_disable_unprepare(smi->clk_smi);
98 clk_disable_unprepare(smi->clk_apb);
99 pm_runtime_put_sync(smi->dev);
102 int mtk_smi_larb_get(struct device *larbdev)
104 struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
105 const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
106 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
109 /* Enable the smi-common's power and clocks */
110 ret = mtk_smi_enable(common);
114 /* Enable the larb's power and clocks */
115 ret = mtk_smi_enable(&larb->smi);
117 mtk_smi_disable(common);
121 /* Configure the iommu info for this larb */
122 larb_gen->config_port(larbdev);
126 EXPORT_SYMBOL_GPL(mtk_smi_larb_get);
128 void mtk_smi_larb_put(struct device *larbdev)
130 struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
131 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
134 * Don't de-configure the iommu info for this larb since there may be
135 * several modules in this larb.
136 * The iommu info will be reset after power off.
139 mtk_smi_disable(&larb->smi);
140 mtk_smi_disable(common);
142 EXPORT_SYMBOL_GPL(mtk_smi_larb_put);
145 mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
147 struct mtk_smi_larb *larb = dev_get_drvdata(dev);
148 struct mtk_smi_iommu *smi_iommu = data;
151 for (i = 0; i < smi_iommu->larb_nr; i++) {
152 if (dev == smi_iommu->larb_imu[i].dev) {
153 /* The 'mmu' may be updated in iommu-attach/detach. */
154 larb->mmu = &smi_iommu->larb_imu[i].mmu;
161 static void mtk_smi_larb_config_port(struct device *dev)
163 struct mtk_smi_larb *larb = dev_get_drvdata(dev);
165 writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
169 static void mtk_smi_larb_config_port_gen1(struct device *dev)
171 struct mtk_smi_larb *larb = dev_get_drvdata(dev);
172 const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
173 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
174 int i, m4u_port_id, larb_port_num;
175 u32 sec_con_val, reg_val;
177 m4u_port_id = larb_gen->port_in_larb[larb->larbid];
178 larb_port_num = larb_gen->port_in_larb[larb->larbid + 1]
179 - larb_gen->port_in_larb[larb->larbid];
181 for (i = 0; i < larb_port_num; i++, m4u_port_id++) {
182 if (*larb->mmu & BIT(i)) {
183 /* bit[port + 3] controls the virtual or physical */
184 sec_con_val = SMI_SECUR_CON_VAL_VIRT(m4u_port_id);
186 /* do not need to enable m4u for this port */
189 reg_val = readl(common->smi_ao_base
190 + REG_SMI_SECUR_CON_ADDR(m4u_port_id));
191 reg_val &= SMI_SECUR_CON_VAL_MSK(m4u_port_id);
192 reg_val |= sec_con_val;
193 reg_val |= SMI_SECUR_CON_VAL_DOMAIN(m4u_port_id);
196 + REG_SMI_SECUR_CON_ADDR(m4u_port_id));
201 mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
203 /* Do nothing as the iommu is always enabled. */
206 static const struct component_ops mtk_smi_larb_component_ops = {
207 .bind = mtk_smi_larb_bind,
208 .unbind = mtk_smi_larb_unbind,
211 static const struct mtk_smi_larb_gen mtk_smi_larb_mt8173 = {
212 /* mt8173 do not need the port in larb */
213 .config_port = mtk_smi_larb_config_port,
216 static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
218 LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
219 LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
221 .config_port = mtk_smi_larb_config_port_gen1,
224 static const struct of_device_id mtk_smi_larb_of_ids[] = {
226 .compatible = "mediatek,mt8173-smi-larb",
227 .data = &mtk_smi_larb_mt8173
230 .compatible = "mediatek,mt2701-smi-larb",
231 .data = &mtk_smi_larb_mt2701
236 static int mtk_smi_larb_probe(struct platform_device *pdev)
238 struct mtk_smi_larb *larb;
239 struct resource *res;
240 struct device *dev = &pdev->dev;
241 struct device_node *smi_node;
242 struct platform_device *smi_pdev;
245 return -EPROBE_DEFER;
247 larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
251 larb->larb_gen = of_device_get_match_data(dev);
252 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
253 larb->base = devm_ioremap_resource(dev, res);
254 if (IS_ERR(larb->base))
255 return PTR_ERR(larb->base);
257 larb->smi.clk_apb = devm_clk_get(dev, "apb");
258 if (IS_ERR(larb->smi.clk_apb))
259 return PTR_ERR(larb->smi.clk_apb);
261 larb->smi.clk_smi = devm_clk_get(dev, "smi");
262 if (IS_ERR(larb->smi.clk_smi))
263 return PTR_ERR(larb->smi.clk_smi);
266 smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
270 smi_pdev = of_find_device_by_node(smi_node);
271 of_node_put(smi_node);
273 larb->smi_common_dev = &smi_pdev->dev;
275 dev_err(dev, "Failed to get the smi_common device\n");
279 pm_runtime_enable(dev);
280 platform_set_drvdata(pdev, larb);
281 return component_add(dev, &mtk_smi_larb_component_ops);
284 static int mtk_smi_larb_remove(struct platform_device *pdev)
286 pm_runtime_disable(&pdev->dev);
287 component_del(&pdev->dev, &mtk_smi_larb_component_ops);
291 static struct platform_driver mtk_smi_larb_driver = {
292 .probe = mtk_smi_larb_probe,
293 .remove = mtk_smi_larb_remove,
295 .name = "mtk-smi-larb",
296 .of_match_table = mtk_smi_larb_of_ids,
300 static const struct of_device_id mtk_smi_common_of_ids[] = {
302 .compatible = "mediatek,mt8173-smi-common",
303 .data = (void *)MTK_SMI_GEN2
306 .compatible = "mediatek,mt2701-smi-common",
307 .data = (void *)MTK_SMI_GEN1
312 static int mtk_smi_common_probe(struct platform_device *pdev)
314 struct device *dev = &pdev->dev;
315 struct mtk_smi *common;
316 struct resource *res;
317 enum mtk_smi_gen smi_gen;
320 return -EPROBE_DEFER;
322 common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
327 common->clk_apb = devm_clk_get(dev, "apb");
328 if (IS_ERR(common->clk_apb))
329 return PTR_ERR(common->clk_apb);
331 common->clk_smi = devm_clk_get(dev, "smi");
332 if (IS_ERR(common->clk_smi))
333 return PTR_ERR(common->clk_smi);
336 * for mtk smi gen 1, we need to get the ao(always on) base to config
337 * m4u port, and we need to enable the aync clock for transform the smi
338 * clock into emi clock domain, but for mtk smi gen2, there's no smi ao
341 smi_gen = (enum mtk_smi_gen)of_device_get_match_data(dev);
342 if (smi_gen == MTK_SMI_GEN1) {
343 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
344 common->smi_ao_base = devm_ioremap_resource(dev, res);
345 if (IS_ERR(common->smi_ao_base))
346 return PTR_ERR(common->smi_ao_base);
348 common->clk_async = devm_clk_get(dev, "async");
349 if (IS_ERR(common->clk_async))
350 return PTR_ERR(common->clk_async);
352 clk_prepare_enable(common->clk_async);
354 pm_runtime_enable(dev);
355 platform_set_drvdata(pdev, common);
359 static int mtk_smi_common_remove(struct platform_device *pdev)
361 pm_runtime_disable(&pdev->dev);
365 static struct platform_driver mtk_smi_common_driver = {
366 .probe = mtk_smi_common_probe,
367 .remove = mtk_smi_common_remove,
369 .name = "mtk-smi-common",
370 .of_match_table = mtk_smi_common_of_ids,
374 static int __init mtk_smi_init(void)
378 ret = platform_driver_register(&mtk_smi_common_driver);
380 pr_err("Failed to register SMI driver\n");
384 ret = platform_driver_register(&mtk_smi_larb_driver);
386 pr_err("Failed to register SMI-LARB driver\n");
392 platform_driver_unregister(&mtk_smi_common_driver);
396 subsys_initcall(mtk_smi_init);