1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/drivers/pcmcia/sa1111_generic.c
4  *
5  * We implement the generic parts of a SA1111 PCMCIA driver.  This
6  * basically means we handle everything except controlling the
7  * power.  Power is machine specific...
8  */
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/ioport.h>
12 #include <linux/device.h>
13 #include <linux/interrupt.h>
14 #include <linux/init.h>
15 #include <linux/io.h>
16 #include <linux/slab.h>
17 
18 #include <pcmcia/ss.h>
19 
20 #include <asm/hardware/sa1111.h>
21 #include <asm/mach-types.h>
22 #include <asm/irq.h>
23 
24 #include "sa1111_generic.h"
25 
26 /*
27  * These are offsets from the above base.
28  */
29 #define PCCR	0x0000
30 #define PCSSR	0x0004
31 #define PCSR	0x0008
32 
33 #define PCSR_S0_READY	(1<<0)
34 #define PCSR_S1_READY	(1<<1)
35 #define PCSR_S0_DETECT	(1<<2)
36 #define PCSR_S1_DETECT	(1<<3)
37 #define PCSR_S0_VS1	(1<<4)
38 #define PCSR_S0_VS2	(1<<5)
39 #define PCSR_S1_VS1	(1<<6)
40 #define PCSR_S1_VS2	(1<<7)
41 #define PCSR_S0_WP	(1<<8)
42 #define PCSR_S1_WP	(1<<9)
43 #define PCSR_S0_BVD1	(1<<10)
44 #define PCSR_S0_BVD2	(1<<11)
45 #define PCSR_S1_BVD1	(1<<12)
46 #define PCSR_S1_BVD2	(1<<13)
47 
48 #define PCCR_S0_RST	(1<<0)
49 #define PCCR_S1_RST	(1<<1)
50 #define PCCR_S0_FLT	(1<<2)
51 #define PCCR_S1_FLT	(1<<3)
52 #define PCCR_S0_PWAITEN	(1<<4)
53 #define PCCR_S1_PWAITEN	(1<<5)
54 #define PCCR_S0_PSE	(1<<6)
55 #define PCCR_S1_PSE	(1<<7)
56 
57 #define PCSSR_S0_SLEEP	(1<<0)
58 #define PCSSR_S1_SLEEP	(1<<1)
59 
60 #define IDX_IRQ_S0_READY_NINT	(0)
61 #define IDX_IRQ_S0_CD_VALID	(1)
62 #define IDX_IRQ_S0_BVD1_STSCHG	(2)
63 #define IDX_IRQ_S1_READY_NINT	(3)
64 #define IDX_IRQ_S1_CD_VALID	(4)
65 #define IDX_IRQ_S1_BVD1_STSCHG	(5)
66 #define NUM_IRQS		(6)
67 
68 void sa1111_pcmcia_socket_state(struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
69 {
70 	struct sa1111_pcmcia_socket *s = to_skt(skt);
71 	u32 status = readl_relaxed(s->dev->mapbase + PCSR);
72 
73 	switch (skt->nr) {
74 	case 0:
75 		state->detect = status & PCSR_S0_DETECT ? 0 : 1;
76 		state->ready  = status & PCSR_S0_READY  ? 1 : 0;
77 		state->bvd1   = status & PCSR_S0_BVD1   ? 1 : 0;
78 		state->bvd2   = status & PCSR_S0_BVD2   ? 1 : 0;
79 		state->wrprot = status & PCSR_S0_WP     ? 1 : 0;
80 		state->vs_3v  = status & PCSR_S0_VS1    ? 0 : 1;
81 		state->vs_Xv  = status & PCSR_S0_VS2    ? 0 : 1;
82 		break;
83 
84 	case 1:
85 		state->detect = status & PCSR_S1_DETECT ? 0 : 1;
86 		state->ready  = status & PCSR_S1_READY  ? 1 : 0;
87 		state->bvd1   = status & PCSR_S1_BVD1   ? 1 : 0;
88 		state->bvd2   = status & PCSR_S1_BVD2   ? 1 : 0;
89 		state->wrprot = status & PCSR_S1_WP     ? 1 : 0;
90 		state->vs_3v  = status & PCSR_S1_VS1    ? 0 : 1;
91 		state->vs_Xv  = status & PCSR_S1_VS2    ? 0 : 1;
92 		break;
93 	}
94 }
95 
96 int sa1111_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
97 {
98 	struct sa1111_pcmcia_socket *s = to_skt(skt);
99 	u32 pccr_skt_mask, pccr_set_mask, val;
100 	unsigned long flags;
101 
102 	switch (skt->nr) {
103 	case 0:
104 		pccr_skt_mask = PCCR_S0_RST|PCCR_S0_FLT|PCCR_S0_PWAITEN|PCCR_S0_PSE;
105 		break;
106 
107 	case 1:
108 		pccr_skt_mask = PCCR_S1_RST|PCCR_S1_FLT|PCCR_S1_PWAITEN|PCCR_S1_PSE;
109 		break;
110 
111 	default:
112 		return -1;
113 	}
114 
115 	pccr_set_mask = 0;
116 
117 	if (state->Vcc != 0)
118 		pccr_set_mask |= PCCR_S0_PWAITEN|PCCR_S1_PWAITEN;
119 	if (state->Vcc == 50)
120 		pccr_set_mask |= PCCR_S0_PSE|PCCR_S1_PSE;
121 	if (state->flags & SS_RESET)
122 		pccr_set_mask |= PCCR_S0_RST|PCCR_S1_RST;
123 	if (state->flags & SS_OUTPUT_ENA)
124 		pccr_set_mask |= PCCR_S0_FLT|PCCR_S1_FLT;
125 
126 	local_irq_save(flags);
127 	val = readl_relaxed(s->dev->mapbase + PCCR);
128 	val &= ~pccr_skt_mask;
129 	val |= pccr_set_mask & pccr_skt_mask;
130 	writel_relaxed(val, s->dev->mapbase + PCCR);
131 	local_irq_restore(flags);
132 
133 	return 0;
134 }
135 
136 int sa1111_pcmcia_add(struct sa1111_dev *dev, struct pcmcia_low_level *ops,
137 	int (*add)(struct soc_pcmcia_socket *))
138 {
139 	struct sa1111_pcmcia_socket *s;
140 	struct clk *clk;
141 	int i, ret = 0, irqs[NUM_IRQS];
142 
143 	clk = devm_clk_get(&dev->dev, NULL);
144 	if (IS_ERR(clk))
145 		return PTR_ERR(clk);
146 
147 	for (i = 0; i < NUM_IRQS; i++) {
148 		irqs[i] = sa1111_get_irq(dev, i);
149 		if (irqs[i] <= 0)
150 			return irqs[i] ? : -ENXIO;
151 	}
152 
153 	ops->socket_state = sa1111_pcmcia_socket_state;
154 
155 	for (i = 0; i < ops->nr; i++) {
156 		s = kzalloc(sizeof(*s), GFP_KERNEL);
157 		if (!s)
158 			return -ENOMEM;
159 
160 		s->soc.nr = ops->first + i;
161 		s->soc.clk = clk;
162 
163 		soc_pcmcia_init_one(&s->soc, ops, &dev->dev);
164 		s->dev = dev;
165 		if (s->soc.nr) {
166 			s->soc.socket.pci_irq = irqs[IDX_IRQ_S1_READY_NINT];
167 			s->soc.stat[SOC_STAT_CD].irq = irqs[IDX_IRQ_S1_CD_VALID];
168 			s->soc.stat[SOC_STAT_CD].name = "SA1111 CF card detect";
169 			s->soc.stat[SOC_STAT_BVD1].irq = irqs[IDX_IRQ_S1_BVD1_STSCHG];
170 			s->soc.stat[SOC_STAT_BVD1].name = "SA1111 CF BVD1";
171 		} else {
172 			s->soc.socket.pci_irq = irqs[IDX_IRQ_S0_READY_NINT];
173 			s->soc.stat[SOC_STAT_CD].irq = irqs[IDX_IRQ_S0_CD_VALID];
174 			s->soc.stat[SOC_STAT_CD].name = "SA1111 PCMCIA card detect";
175 			s->soc.stat[SOC_STAT_BVD1].irq = irqs[IDX_IRQ_S0_BVD1_STSCHG];
176 			s->soc.stat[SOC_STAT_BVD1].name = "SA1111 PCMCIA BVD1";
177 		}
178 
179 		ret = add(&s->soc);
180 		if (ret == 0) {
181 			s->next = dev_get_drvdata(&dev->dev);
182 			dev_set_drvdata(&dev->dev, s);
183 		} else
184 			kfree(s);
185 	}
186 
187 	return ret;
188 }
189 
190 static int pcmcia_probe(struct sa1111_dev *dev)
191 {
192 	void __iomem *base;
193 	int ret;
194 
195 	ret = sa1111_enable_device(dev);
196 	if (ret)
197 		return ret;
198 
199 	dev_set_drvdata(&dev->dev, NULL);
200 
201 	if (!request_mem_region(dev->res.start, 512, SA1111_DRIVER_NAME(dev))) {
202 		sa1111_disable_device(dev);
203 		return -EBUSY;
204 	}
205 
206 	base = dev->mapbase;
207 
208 	/*
209 	 * Initialise the suspend state.
210 	 */
211 	writel_relaxed(PCSSR_S0_SLEEP | PCSSR_S1_SLEEP, base + PCSSR);
212 	writel_relaxed(PCCR_S0_FLT | PCCR_S1_FLT, base + PCCR);
213 
214 	ret = -ENODEV;
215 #ifdef CONFIG_SA1100_JORNADA720
216 	if (machine_is_jornada720())
217 		ret = pcmcia_jornada720_init(dev);
218 #endif
219 #ifdef CONFIG_ASSABET_NEPONSET
220 	if (machine_is_assabet())
221 		ret = pcmcia_neponset_init(dev);
222 #endif
223 
224 	if (ret) {
225 		release_mem_region(dev->res.start, 512);
226 		sa1111_disable_device(dev);
227 	}
228 
229 	return ret;
230 }
231 
232 static void pcmcia_remove(struct sa1111_dev *dev)
233 {
234 	struct sa1111_pcmcia_socket *next, *s = dev_get_drvdata(&dev->dev);
235 
236 	dev_set_drvdata(&dev->dev, NULL);
237 
238 	for (; s; s = next) {
239 		next = s->next;
240 		soc_pcmcia_remove_one(&s->soc);
241 		kfree(s);
242 	}
243 
244 	release_mem_region(dev->res.start, 512);
245 	sa1111_disable_device(dev);
246 }
247 
248 static struct sa1111_driver pcmcia_driver = {
249 	.drv = {
250 		.name	= "sa1111-pcmcia",
251 	},
252 	.devid		= SA1111_DEVID_PCMCIA,
253 	.probe		= pcmcia_probe,
254 	.remove		= pcmcia_remove,
255 };
256 
257 static int __init sa1111_drv_pcmcia_init(void)
258 {
259 	return sa1111_driver_register(&pcmcia_driver);
260 }
261 
262 static void __exit sa1111_drv_pcmcia_exit(void)
263 {
264 	sa1111_driver_unregister(&pcmcia_driver);
265 }
266 
267 fs_initcall(sa1111_drv_pcmcia_init);
268 module_exit(sa1111_drv_pcmcia_exit);
269 
270 MODULE_DESCRIPTION("SA1111 PCMCIA card socket driver");
271 MODULE_LICENSE("GPL");
272