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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | // SPDX-License-Identifier: GPL-2.0 /* * Linux driver for RPC-IF HyperFlash * * Copyright (C) 2019-2020 Cogent Embedded, Inc. */ #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mtd/hyperbus.h> #include <linux/mtd/mtd.h> #include <linux/mux/consumer.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/types.h> #include <memory/renesas-rpc-if.h> struct rpcif_hyperbus { struct rpcif rpc; struct hyperbus_ctlr ctlr; struct hyperbus_device hbdev; }; static const struct rpcif_op rpcif_op_tmpl = { .cmd = { .buswidth = 8, .ddr = true, }, .ocmd = { .buswidth = 8, .ddr = true, }, .addr = { .nbytes = 1, .buswidth = 8, .ddr = true, }, .data = { .buswidth = 8, .ddr = true, }, }; static void rpcif_hb_prepare_read(struct rpcif *rpc, void *to, unsigned long from, ssize_t len) { struct rpcif_op op = rpcif_op_tmpl; op.cmd.opcode = HYPERBUS_RW_READ | HYPERBUS_AS_MEM; op.addr.val = from >> 1; op.dummy.buswidth = 1; op.dummy.ncycles = 15; op.data.dir = RPCIF_DATA_IN; op.data.nbytes = len; op.data.buf.in = to; rpcif_prepare(rpc->dev, &op, NULL, NULL); } static void rpcif_hb_prepare_write(struct rpcif *rpc, unsigned long to, void *from, ssize_t len) { struct rpcif_op op = rpcif_op_tmpl; op.cmd.opcode = HYPERBUS_RW_WRITE | HYPERBUS_AS_MEM; op.addr.val = to >> 1; op.data.dir = RPCIF_DATA_OUT; op.data.nbytes = len; op.data.buf.out = from; rpcif_prepare(rpc->dev, &op, NULL, NULL); } static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr) { struct rpcif_hyperbus *hyperbus = container_of(hbdev, struct rpcif_hyperbus, hbdev); map_word data; rpcif_hb_prepare_read(&hyperbus->rpc, &data, addr, 2); rpcif_manual_xfer(hyperbus->rpc.dev); return data.x[0]; } static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr, u16 data) { struct rpcif_hyperbus *hyperbus = container_of(hbdev, struct rpcif_hyperbus, hbdev); rpcif_hb_prepare_write(&hyperbus->rpc, addr, &data, 2); rpcif_manual_xfer(hyperbus->rpc.dev); } static void rpcif_hb_copy_from(struct hyperbus_device *hbdev, void *to, unsigned long from, ssize_t len) { struct rpcif_hyperbus *hyperbus = container_of(hbdev, struct rpcif_hyperbus, hbdev); rpcif_hb_prepare_read(&hyperbus->rpc, to, from, len); rpcif_dirmap_read(hyperbus->rpc.dev, from, len, to); } static const struct hyperbus_ops rpcif_hb_ops = { .read16 = rpcif_hb_read16, .write16 = rpcif_hb_write16, .copy_from = rpcif_hb_copy_from, }; static int rpcif_hb_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rpcif_hyperbus *hyperbus; int error; hyperbus = devm_kzalloc(dev, sizeof(*hyperbus), GFP_KERNEL); if (!hyperbus) return -ENOMEM; error = rpcif_sw_init(&hyperbus->rpc, pdev->dev.parent); if (error) return error; platform_set_drvdata(pdev, hyperbus); pm_runtime_enable(hyperbus->rpc.dev); error = rpcif_hw_init(hyperbus->rpc.dev, true); if (error) goto out_disable_rpm; hyperbus->hbdev.map.size = hyperbus->rpc.size; hyperbus->hbdev.map.virt = hyperbus->rpc.dirmap; hyperbus->ctlr.dev = dev; hyperbus->ctlr.ops = &rpcif_hb_ops; hyperbus->hbdev.ctlr = &hyperbus->ctlr; hyperbus->hbdev.np = of_get_next_child(pdev->dev.parent->of_node, NULL); error = hyperbus_register_device(&hyperbus->hbdev); if (error) goto out_disable_rpm; return 0; out_disable_rpm: pm_runtime_disable(hyperbus->rpc.dev); return error; } static void rpcif_hb_remove(struct platform_device *pdev) { struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev); hyperbus_unregister_device(&hyperbus->hbdev); pm_runtime_disable(hyperbus->rpc.dev); } static struct platform_driver rpcif_platform_driver = { .probe = rpcif_hb_probe, .remove_new = rpcif_hb_remove, .driver = { .name = "rpc-if-hyperflash", }, }; module_platform_driver(rpcif_platform_driver); MODULE_DESCRIPTION("Renesas RPC-IF HyperFlash driver"); MODULE_LICENSE("GPL v2"); |