tc6387xb.c (5224B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Toshiba TC6387XB support 4 * Copyright (c) 2005 Ian Molton 5 * 6 * This file contains TC6387XB base support. 7 */ 8 9#include <linux/module.h> 10#include <linux/platform_device.h> 11#include <linux/clk.h> 12#include <linux/err.h> 13#include <linux/mfd/core.h> 14#include <linux/mfd/tmio.h> 15#include <linux/mfd/tc6387xb.h> 16#include <linux/slab.h> 17 18enum { 19 TC6387XB_CELL_MMC, 20}; 21 22struct tc6387xb { 23 void __iomem *scr; 24 struct clk *clk32k; 25 struct resource rscr; 26}; 27 28static const struct resource tc6387xb_mmc_resources[] = { 29 { 30 .start = 0x800, 31 .end = 0x9ff, 32 .flags = IORESOURCE_MEM, 33 }, 34 { 35 .start = 0, 36 .end = 0, 37 .flags = IORESOURCE_IRQ, 38 }, 39}; 40 41/*--------------------------------------------------------------------------*/ 42 43#ifdef CONFIG_PM 44static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state) 45{ 46 struct tc6387xb *tc6387xb = platform_get_drvdata(dev); 47 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); 48 49 if (pdata && pdata->suspend) 50 pdata->suspend(dev); 51 clk_disable_unprepare(tc6387xb->clk32k); 52 53 return 0; 54} 55 56static int tc6387xb_resume(struct platform_device *dev) 57{ 58 struct tc6387xb *tc6387xb = platform_get_drvdata(dev); 59 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); 60 61 clk_prepare_enable(tc6387xb->clk32k); 62 if (pdata && pdata->resume) 63 pdata->resume(dev); 64 65 tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0, 66 tc6387xb_mmc_resources[0].start & 0xfffe); 67 68 return 0; 69} 70#else 71#define tc6387xb_suspend NULL 72#define tc6387xb_resume NULL 73#endif 74 75/*--------------------------------------------------------------------------*/ 76 77static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state) 78{ 79 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); 80 81 tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state); 82} 83 84static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state) 85{ 86 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); 87 88 tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state); 89} 90 91 92static int tc6387xb_mmc_enable(struct platform_device *mmc) 93{ 94 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); 95 96 clk_prepare_enable(tc6387xb->clk32k); 97 98 tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0, 99 tc6387xb_mmc_resources[0].start & 0xfffe); 100 101 return 0; 102} 103 104static int tc6387xb_mmc_disable(struct platform_device *mmc) 105{ 106 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); 107 108 clk_disable_unprepare(tc6387xb->clk32k); 109 110 return 0; 111} 112 113static struct tmio_mmc_data tc6387xb_mmc_data = { 114 .hclk = 24000000, 115 .set_pwr = tc6387xb_mmc_pwr, 116 .set_clk_div = tc6387xb_mmc_clk_div, 117}; 118 119/*--------------------------------------------------------------------------*/ 120 121static const struct mfd_cell tc6387xb_cells[] = { 122 [TC6387XB_CELL_MMC] = { 123 .name = "tmio-mmc", 124 .enable = tc6387xb_mmc_enable, 125 .disable = tc6387xb_mmc_disable, 126 .platform_data = &tc6387xb_mmc_data, 127 .pdata_size = sizeof(tc6387xb_mmc_data), 128 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources), 129 .resources = tc6387xb_mmc_resources, 130 }, 131}; 132 133static int tc6387xb_probe(struct platform_device *dev) 134{ 135 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); 136 struct resource *iomem, *rscr; 137 struct clk *clk32k; 138 struct tc6387xb *tc6387xb; 139 int irq, ret; 140 141 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0); 142 if (!iomem) 143 return -EINVAL; 144 145 tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL); 146 if (!tc6387xb) 147 return -ENOMEM; 148 149 ret = platform_get_irq(dev, 0); 150 if (ret >= 0) 151 irq = ret; 152 else 153 goto err_no_irq; 154 155 clk32k = clk_get(&dev->dev, "CLK_CK32K"); 156 if (IS_ERR(clk32k)) { 157 ret = PTR_ERR(clk32k); 158 goto err_no_clk; 159 } 160 161 rscr = &tc6387xb->rscr; 162 rscr->name = "tc6387xb-core"; 163 rscr->start = iomem->start; 164 rscr->end = iomem->start + 0xff; 165 rscr->flags = IORESOURCE_MEM; 166 167 ret = request_resource(iomem, rscr); 168 if (ret) 169 goto err_resource; 170 171 tc6387xb->scr = ioremap(rscr->start, resource_size(rscr)); 172 if (!tc6387xb->scr) { 173 ret = -ENOMEM; 174 goto err_ioremap; 175 } 176 177 tc6387xb->clk32k = clk32k; 178 platform_set_drvdata(dev, tc6387xb); 179 180 if (pdata && pdata->enable) 181 pdata->enable(dev); 182 183 dev_info(&dev->dev, "Toshiba tc6387xb initialised\n"); 184 185 ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells, 186 ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL); 187 188 if (!ret) 189 return 0; 190 191 iounmap(tc6387xb->scr); 192err_ioremap: 193 release_resource(&tc6387xb->rscr); 194err_resource: 195 clk_put(clk32k); 196err_no_clk: 197err_no_irq: 198 kfree(tc6387xb); 199 return ret; 200} 201 202static int tc6387xb_remove(struct platform_device *dev) 203{ 204 struct tc6387xb *tc6387xb = platform_get_drvdata(dev); 205 206 mfd_remove_devices(&dev->dev); 207 iounmap(tc6387xb->scr); 208 release_resource(&tc6387xb->rscr); 209 clk_disable_unprepare(tc6387xb->clk32k); 210 clk_put(tc6387xb->clk32k); 211 kfree(tc6387xb); 212 213 return 0; 214} 215 216 217static struct platform_driver tc6387xb_platform_driver = { 218 .driver = { 219 .name = "tc6387xb", 220 }, 221 .probe = tc6387xb_probe, 222 .remove = tc6387xb_remove, 223 .suspend = tc6387xb_suspend, 224 .resume = tc6387xb_resume, 225}; 226 227module_platform_driver(tc6387xb_platform_driver); 228 229MODULE_DESCRIPTION("Toshiba TC6387XB core driver"); 230MODULE_LICENSE("GPL v2"); 231MODULE_AUTHOR("Ian Molton"); 232MODULE_ALIAS("platform:tc6387xb"); 233