1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * arch/powerpc/platforms/83xx/mpc832x_rdb.c
4  *
5  * Copyright (C) Freescale Semiconductor, Inc. 2007. All rights reserved.
6  *
7  * Description:
8  * MPC832x RDB board specific routines.
9  * This file is based on mpc832x_mds.c and mpc8313_rdb.c
10  * Author: Michael Barkowski <michael.barkowski@freescale.com>
11  */
12 
13 #include <linux/pci.h>
14 #include <linux/interrupt.h>
15 #include <linux/spi/spi.h>
16 #include <linux/spi/mmc_spi.h>
17 #include <linux/mmc/host.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_platform.h>
20 #include <linux/fsl_devices.h>
21 
22 #include <asm/time.h>
23 #include <asm/ipic.h>
24 #include <asm/udbg.h>
25 #include <soc/fsl/qe/qe.h>
26 #include <sysdev/fsl_soc.h>
27 #include <sysdev/fsl_pci.h>
28 
29 #include "mpc83xx.h"
30 
31 #undef DEBUG
32 #ifdef DEBUG
33 #define DBG(fmt...) udbg_printf(fmt)
34 #else
35 #define DBG(fmt...)
36 #endif
37 
38 #ifdef CONFIG_QUICC_ENGINE
of_fsl_spi_probe(char * type,char * compatible,u32 sysclk,struct spi_board_info * board_infos,unsigned int num_board_infos,void (* cs_control)(struct spi_device * dev,bool on))39 static int __init of_fsl_spi_probe(char *type, char *compatible, u32 sysclk,
40 				   struct spi_board_info *board_infos,
41 				   unsigned int num_board_infos,
42 				   void (*cs_control)(struct spi_device *dev,
43 						      bool on))
44 {
45 	struct device_node *np;
46 	unsigned int i = 0;
47 
48 	for_each_compatible_node(np, type, compatible) {
49 		int ret;
50 		unsigned int j;
51 		const void *prop;
52 		struct resource res[2];
53 		struct platform_device *pdev;
54 		struct fsl_spi_platform_data pdata = {
55 			.cs_control = cs_control,
56 		};
57 
58 		memset(res, 0, sizeof(res));
59 
60 		pdata.sysclk = sysclk;
61 
62 		prop = of_get_property(np, "reg", NULL);
63 		if (!prop)
64 			goto err;
65 		pdata.bus_num = *(u32 *)prop;
66 
67 		prop = of_get_property(np, "cell-index", NULL);
68 		if (prop)
69 			i = *(u32 *)prop;
70 
71 		prop = of_get_property(np, "mode", NULL);
72 		if (prop && !strcmp(prop, "cpu-qe"))
73 			pdata.flags = SPI_QE_CPU_MODE;
74 
75 		for (j = 0; j < num_board_infos; j++) {
76 			if (board_infos[j].bus_num == pdata.bus_num)
77 				pdata.max_chipselect++;
78 		}
79 
80 		if (!pdata.max_chipselect)
81 			continue;
82 
83 		ret = of_address_to_resource(np, 0, &res[0]);
84 		if (ret)
85 			goto err;
86 
87 		ret = of_irq_to_resource(np, 0, &res[1]);
88 		if (ret <= 0)
89 			goto err;
90 
91 		pdev = platform_device_alloc("mpc83xx_spi", i);
92 		if (!pdev)
93 			goto err;
94 
95 		ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
96 		if (ret)
97 			goto unreg;
98 
99 		ret = platform_device_add_resources(pdev, res,
100 						    ARRAY_SIZE(res));
101 		if (ret)
102 			goto unreg;
103 
104 		ret = platform_device_add(pdev);
105 		if (ret)
106 			goto unreg;
107 
108 		goto next;
109 unreg:
110 		platform_device_put(pdev);
111 err:
112 		pr_err("%pOF: registration failed\n", np);
113 next:
114 		i++;
115 	}
116 
117 	return i;
118 }
119 
fsl_spi_init(struct spi_board_info * board_infos,unsigned int num_board_infos,void (* cs_control)(struct spi_device * spi,bool on))120 static int __init fsl_spi_init(struct spi_board_info *board_infos,
121 			       unsigned int num_board_infos,
122 			       void (*cs_control)(struct spi_device *spi,
123 						  bool on))
124 {
125 	u32 sysclk = -1;
126 	int ret;
127 
128 	/* SPI controller is either clocked from QE or SoC clock */
129 	sysclk = get_brgfreq();
130 	if (sysclk == -1) {
131 		sysclk = fsl_get_sys_freq();
132 		if (sysclk == -1)
133 			return -ENODEV;
134 	}
135 
136 	ret = of_fsl_spi_probe(NULL, "fsl,spi", sysclk, board_infos,
137 			       num_board_infos, cs_control);
138 	if (!ret)
139 		of_fsl_spi_probe("spi", "fsl_spi", sysclk, board_infos,
140 				 num_board_infos, cs_control);
141 
142 	return spi_register_board_info(board_infos, num_board_infos);
143 }
144 
mpc83xx_spi_cs_control(struct spi_device * spi,bool on)145 static void mpc83xx_spi_cs_control(struct spi_device *spi, bool on)
146 {
147 	pr_debug("%s %d %d\n", __func__, spi->chip_select, on);
148 	par_io_data_set(3, 13, on);
149 }
150 
151 static struct mmc_spi_platform_data mpc832x_mmc_pdata = {
152 	.ocr_mask = MMC_VDD_33_34,
153 };
154 
155 static struct spi_board_info mpc832x_spi_boardinfo = {
156 	.bus_num = 0x4c0,
157 	.chip_select = 0,
158 	.max_speed_hz = 50000000,
159 	.modalias = "mmc_spi",
160 	.platform_data = &mpc832x_mmc_pdata,
161 };
162 
mpc832x_spi_init(void)163 static int __init mpc832x_spi_init(void)
164 {
165 	struct device_node *np;
166 
167 	par_io_config_pin(3,  0, 3, 0, 1, 0); /* SPI1 MOSI, I/O */
168 	par_io_config_pin(3,  1, 3, 0, 1, 0); /* SPI1 MISO, I/O */
169 	par_io_config_pin(3,  2, 3, 0, 1, 0); /* SPI1 CLK,  I/O */
170 	par_io_config_pin(3,  3, 2, 0, 1, 0); /* SPI1 SEL,  I   */
171 
172 	par_io_config_pin(3, 13, 1, 0, 0, 0); /* !SD_CS,    O */
173 	par_io_config_pin(3, 14, 2, 0, 0, 0); /* SD_INSERT, I */
174 	par_io_config_pin(3, 15, 2, 0, 0, 0); /* SD_PROTECT,I */
175 
176 	/*
177 	 * Don't bother with legacy stuff when device tree contains
178 	 * mmc-spi-slot node.
179 	 */
180 	np = of_find_compatible_node(NULL, NULL, "mmc-spi-slot");
181 	of_node_put(np);
182 	if (np)
183 		return 0;
184 	return fsl_spi_init(&mpc832x_spi_boardinfo, 1, mpc83xx_spi_cs_control);
185 }
186 machine_device_initcall(mpc832x_rdb, mpc832x_spi_init);
187 #endif /* CONFIG_QUICC_ENGINE */
188 
189 /* ************************************************************************
190  *
191  * Setup the architecture
192  *
193  */
mpc832x_rdb_setup_arch(void)194 static void __init mpc832x_rdb_setup_arch(void)
195 {
196 #if defined(CONFIG_QUICC_ENGINE)
197 	struct device_node *np;
198 #endif
199 
200 	mpc83xx_setup_arch();
201 
202 #ifdef CONFIG_QUICC_ENGINE
203 	if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
204 		par_io_init(np);
205 		of_node_put(np);
206 
207 		for_each_node_by_name(np, "ucc")
208 			par_io_of_config(np);
209 	}
210 #endif				/* CONFIG_QUICC_ENGINE */
211 }
212 
213 machine_device_initcall(mpc832x_rdb, mpc83xx_declare_of_platform_devices);
214 
215 /*
216  * Called very early, MMU is off, device-tree isn't unflattened
217  */
mpc832x_rdb_probe(void)218 static int __init mpc832x_rdb_probe(void)
219 {
220 	return of_machine_is_compatible("MPC832xRDB");
221 }
222 
define_machine(mpc832x_rdb)223 define_machine(mpc832x_rdb) {
224 	.name		= "MPC832x RDB",
225 	.probe		= mpc832x_rdb_probe,
226 	.setup_arch	= mpc832x_rdb_setup_arch,
227 	.discover_phbs  = mpc83xx_setup_pci,
228 	.init_IRQ	= mpc83xx_ipic_init_IRQ,
229 	.get_irq	= ipic_get_irq,
230 	.restart	= mpc83xx_restart,
231 	.time_init	= mpc83xx_time_init,
232 	.calibrate_decr	= generic_calibrate_decr,
233 	.progress	= udbg_progress,
234 };
235