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