1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright © 2021 Broadcom
4  */
5 #include <linux/bcma/bcma.h>
6 #include <linux/bcma/bcma_driver_chipcommon.h>
7 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 
11 #include "brcmnand.h"
12 
13 struct brcmnand_bcma_soc {
14 	struct brcmnand_soc soc;
15 	struct bcma_drv_cc *cc;
16 };
17 
brcmnand_bcma_needs_swapping(u32 offset)18 static inline bool brcmnand_bcma_needs_swapping(u32 offset)
19 {
20 	switch (offset) {
21 	case BCMA_CC_NAND_SPARE_RD0:
22 	case BCMA_CC_NAND_SPARE_RD4:
23 	case BCMA_CC_NAND_SPARE_RD8:
24 	case BCMA_CC_NAND_SPARE_RD12:
25 	case BCMA_CC_NAND_SPARE_WR0:
26 	case BCMA_CC_NAND_SPARE_WR4:
27 	case BCMA_CC_NAND_SPARE_WR8:
28 	case BCMA_CC_NAND_SPARE_WR12:
29 	case BCMA_CC_NAND_DEVID:
30 	case BCMA_CC_NAND_DEVID_X:
31 	case BCMA_CC_NAND_SPARE_RD16:
32 	case BCMA_CC_NAND_SPARE_RD20:
33 	case BCMA_CC_NAND_SPARE_RD24:
34 	case BCMA_CC_NAND_SPARE_RD28:
35 		return true;
36 	}
37 
38 	return false;
39 }
40 
to_bcma_soc(struct brcmnand_soc * soc)41 static inline struct brcmnand_bcma_soc *to_bcma_soc(struct brcmnand_soc *soc)
42 {
43 	return container_of(soc, struct brcmnand_bcma_soc, soc);
44 }
45 
brcmnand_bcma_read_reg(struct brcmnand_soc * soc,u32 offset)46 static u32 brcmnand_bcma_read_reg(struct brcmnand_soc *soc, u32 offset)
47 {
48 	struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
49 	u32 val;
50 
51 	/* Offset into the NAND block and deal with the flash cache separately */
52 	if (offset == BRCMNAND_NON_MMIO_FC_ADDR)
53 		offset = BCMA_CC_NAND_CACHE_DATA;
54 	else
55 		offset += BCMA_CC_NAND_REVISION;
56 
57 	val = bcma_cc_read32(sc->cc, offset);
58 
59 	/* Swap if necessary */
60 	if (brcmnand_bcma_needs_swapping(offset))
61 		val = be32_to_cpu((__force __be32)val);
62 	return val;
63 }
64 
brcmnand_bcma_write_reg(struct brcmnand_soc * soc,u32 val,u32 offset)65 static void brcmnand_bcma_write_reg(struct brcmnand_soc *soc, u32 val,
66 				    u32 offset)
67 {
68 	struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
69 
70 	/* Offset into the NAND block */
71 	if (offset == BRCMNAND_NON_MMIO_FC_ADDR)
72 		offset = BCMA_CC_NAND_CACHE_DATA;
73 	else
74 		offset += BCMA_CC_NAND_REVISION;
75 
76 	/* Swap if necessary */
77 	if (brcmnand_bcma_needs_swapping(offset))
78 		val = (__force u32)cpu_to_be32(val);
79 
80 	bcma_cc_write32(sc->cc, offset, val);
81 }
82 
83 static struct brcmnand_io_ops brcmnand_bcma_io_ops = {
84 	.read_reg	= brcmnand_bcma_read_reg,
85 	.write_reg	= brcmnand_bcma_write_reg,
86 };
87 
brcmnand_bcma_prepare_data_bus(struct brcmnand_soc * soc,bool prepare,bool is_param)88 static void brcmnand_bcma_prepare_data_bus(struct brcmnand_soc *soc, bool prepare,
89 					   bool is_param)
90 {
91 	struct brcmnand_bcma_soc *sc = to_bcma_soc(soc);
92 
93 	/* Reset the cache address to ensure we are already accessing the
94 	 * beginning of a sub-page.
95 	 */
96 	bcma_cc_write32(sc->cc, BCMA_CC_NAND_CACHE_ADDR, 0);
97 }
98 
brcmnand_bcma_nand_probe(struct platform_device * pdev)99 static int brcmnand_bcma_nand_probe(struct platform_device *pdev)
100 {
101 	struct bcma_nflash *nflash = dev_get_platdata(&pdev->dev);
102 	struct brcmnand_bcma_soc *soc;
103 
104 	soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL);
105 	if (!soc)
106 		return -ENOMEM;
107 
108 	soc->cc = container_of(nflash, struct bcma_drv_cc, nflash);
109 	soc->soc.prepare_data_bus = brcmnand_bcma_prepare_data_bus;
110 	soc->soc.ops = &brcmnand_bcma_io_ops;
111 
112 	if (soc->cc->core->bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
113 		dev_err(&pdev->dev, "Use bcm47xxnflash for 4706!\n");
114 		return -ENODEV;
115 	}
116 
117 	return brcmnand_probe(pdev, &soc->soc);
118 }
119 
120 static struct platform_driver brcmnand_bcma_nand_driver = {
121 	.probe			= brcmnand_bcma_nand_probe,
122 	.remove			= brcmnand_remove,
123 	.driver = {
124 		.name		= "bcma_brcmnand",
125 		.pm		= &brcmnand_pm_ops,
126 	}
127 };
128 module_platform_driver(brcmnand_bcma_nand_driver);
129 
130 MODULE_LICENSE("GPL v2");
131 MODULE_AUTHOR("Broadcom");
132 MODULE_DESCRIPTION("NAND controller driver glue for BCMA chips");
133