Jon Hunter | 9c8eddd | 2016-06-07 16:12:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/clk.h> |
| 18 | #include <linux/of_device.h> |
| 19 | #include <linux/of_irq.h> |
| 20 | #include <linux/irqchip/arm-gic.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/pm_clock.h> |
| 23 | #include <linux/pm_runtime.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | struct gic_clk_data { |
| 27 | unsigned int num_clocks; |
| 28 | const char *const *clocks; |
| 29 | }; |
| 30 | |
| 31 | static int gic_runtime_resume(struct device *dev) |
| 32 | { |
| 33 | struct gic_chip_data *gic = dev_get_drvdata(dev); |
| 34 | int ret; |
| 35 | |
| 36 | ret = pm_clk_resume(dev); |
| 37 | if (ret) |
| 38 | return ret; |
| 39 | |
| 40 | /* |
| 41 | * On the very first resume, the pointer to the driver data |
| 42 | * will be NULL and this is intentional, because we do not |
| 43 | * want to restore the GIC on the very first resume. So if |
| 44 | * the pointer is not valid just return. |
| 45 | */ |
| 46 | if (!gic) |
| 47 | return 0; |
| 48 | |
| 49 | gic_dist_restore(gic); |
| 50 | gic_cpu_restore(gic); |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static int gic_runtime_suspend(struct device *dev) |
| 56 | { |
| 57 | struct gic_chip_data *gic = dev_get_drvdata(dev); |
| 58 | |
| 59 | gic_dist_save(gic); |
| 60 | gic_cpu_save(gic); |
| 61 | |
| 62 | return pm_clk_suspend(dev); |
| 63 | } |
| 64 | |
| 65 | static int gic_get_clocks(struct device *dev, const struct gic_clk_data *data) |
| 66 | { |
| 67 | struct clk *clk; |
| 68 | unsigned int i; |
| 69 | int ret; |
| 70 | |
| 71 | if (!dev || !data) |
| 72 | return -EINVAL; |
| 73 | |
| 74 | ret = pm_clk_create(dev); |
| 75 | if (ret) |
| 76 | return ret; |
| 77 | |
| 78 | for (i = 0; i < data->num_clocks; i++) { |
| 79 | clk = of_clk_get_by_name(dev->of_node, data->clocks[i]); |
| 80 | if (IS_ERR(clk)) { |
| 81 | dev_err(dev, "failed to get clock %s\n", |
| 82 | data->clocks[i]); |
| 83 | ret = PTR_ERR(clk); |
| 84 | goto error; |
| 85 | } |
| 86 | |
| 87 | ret = pm_clk_add_clk(dev, clk); |
| 88 | if (ret) { |
| 89 | dev_err(dev, "failed to add clock at index %d\n", i); |
| 90 | clk_put(clk); |
| 91 | goto error; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | return 0; |
| 96 | |
| 97 | error: |
| 98 | pm_clk_destroy(dev); |
| 99 | |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | static int gic_probe(struct platform_device *pdev) |
| 104 | { |
| 105 | struct device *dev = &pdev->dev; |
| 106 | const struct gic_clk_data *data; |
| 107 | struct gic_chip_data *gic; |
| 108 | int ret, irq; |
| 109 | |
| 110 | data = of_device_get_match_data(&pdev->dev); |
| 111 | if (!data) { |
| 112 | dev_err(&pdev->dev, "no device match found\n"); |
| 113 | return -ENODEV; |
| 114 | } |
| 115 | |
| 116 | irq = irq_of_parse_and_map(dev->of_node, 0); |
| 117 | if (!irq) { |
| 118 | dev_err(dev, "no parent interrupt found!\n"); |
| 119 | return -EINVAL; |
| 120 | } |
| 121 | |
| 122 | ret = gic_get_clocks(dev, data); |
| 123 | if (ret) |
| 124 | goto irq_dispose; |
| 125 | |
| 126 | pm_runtime_enable(dev); |
| 127 | |
| 128 | ret = pm_runtime_get_sync(dev); |
| 129 | if (ret < 0) |
| 130 | goto rpm_disable; |
| 131 | |
| 132 | ret = gic_of_init_child(dev, &gic, irq); |
| 133 | if (ret) |
| 134 | goto rpm_put; |
| 135 | |
| 136 | platform_set_drvdata(pdev, gic); |
| 137 | |
| 138 | pm_runtime_put(dev); |
| 139 | |
| 140 | dev_info(dev, "GIC IRQ controller registered\n"); |
| 141 | |
| 142 | return 0; |
| 143 | |
| 144 | rpm_put: |
| 145 | pm_runtime_put_sync(dev); |
| 146 | rpm_disable: |
| 147 | pm_runtime_disable(dev); |
| 148 | pm_clk_destroy(dev); |
| 149 | irq_dispose: |
| 150 | irq_dispose_mapping(irq); |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static const struct dev_pm_ops gic_pm_ops = { |
| 156 | SET_RUNTIME_PM_OPS(gic_runtime_suspend, |
| 157 | gic_runtime_resume, NULL) |
| 158 | }; |
| 159 | |
| 160 | static const char * const gic400_clocks[] = { |
| 161 | "clk", |
| 162 | }; |
| 163 | |
| 164 | static const struct gic_clk_data gic400_data = { |
| 165 | .num_clocks = ARRAY_SIZE(gic400_clocks), |
| 166 | .clocks = gic400_clocks, |
| 167 | }; |
| 168 | |
| 169 | static const struct of_device_id gic_match[] = { |
| 170 | { .compatible = "nvidia,tegra210-agic", .data = &gic400_data }, |
| 171 | {}, |
| 172 | }; |
| 173 | MODULE_DEVICE_TABLE(of, gic_match); |
| 174 | |
| 175 | static struct platform_driver gic_driver = { |
| 176 | .probe = gic_probe, |
| 177 | .driver = { |
| 178 | .name = "gic", |
| 179 | .of_match_table = gic_match, |
| 180 | .pm = &gic_pm_ops, |
| 181 | } |
| 182 | }; |
| 183 | |
| 184 | builtin_platform_driver(gic_driver); |