1 /*
2 * Sonics Silicon Backplane
3 * Broadcom EXTIF core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
7 * Copyright 2006, 2007, Felix Fietkau <nbd@openwrt.org>
8 * Copyright 2007, Aurelien Jarno <aurelien@aurel32.net>
9 *
10 * Licensed under the GNU/GPL. See COPYING for details.
11 */
12
13 #include <linux/serial.h>
14 #include <linux/serial_core.h>
15 #include <linux/serial_reg.h>
16
17 #include "ssb_private.h"
18
19
20 static inline u32 extif_read32(struct ssb_extif *extif, u16 offset)
21 {
22 return ssb_read32(extif->dev, offset);
23 }
24
25 static inline void extif_write32(struct ssb_extif *extif, u16 offset, u32 value)
26 {
27 ssb_write32(extif->dev, offset, value);
28 }
29
30 static inline u32 extif_write32_masked(struct ssb_extif *extif, u16 offset,
31 u32 mask, u32 value)
32 {
33 value &= mask;
34 value |= extif_read32(extif, offset) & ~mask;
35 extif_write32(extif, offset, value);
36
37 return value;
38 }
39
40 #ifdef CONFIG_SSB_SERIAL
41 static bool serial_exists(u8 *regs)
42 {
43 u8 save_mcr, msr = 0;
44
45 if (regs) {
46 save_mcr = regs[UART_MCR];
47 regs[UART_MCR] = (UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_RTS);
48 msr = regs[UART_MSR] & (UART_MSR_DCD | UART_MSR_RI
49 | UART_MSR_CTS | UART_MSR_DSR);
50 regs[UART_MCR] = save_mcr;
51 }
52 return (msr == (UART_MSR_DCD | UART_MSR_CTS));
53 }
54
55 int ssb_extif_serial_init(struct ssb_extif *extif, struct ssb_serial_port *ports)
56 {
57 u32 i, nr_ports = 0;
58
59 /* Disable GPIO interrupt initially */
60 extif_write32(extif, SSB_EXTIF_GPIO_INTPOL, 0);
61 extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 0);
62
63 for (i = 0; i < 2; i++) {
64 void __iomem *uart_regs;
65
66 uart_regs = ioremap_nocache(SSB_EUART, 16);
67 if (uart_regs) {
68 uart_regs += (i * 8);
69
70 if (serial_exists(uart_regs) && ports) {
71 extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 2);
72
73 nr_ports++;
74 ports[i].regs = uart_regs;
75 ports[i].irq = 2;
76 ports[i].baud_base = 13500000;
77 ports[i].reg_shift = 0;
78 }
79 iounmap(uart_regs);
80 }
81 }
82 return nr_ports;
83 }
84 #endif /* CONFIG_SSB_SERIAL */
85
86 void ssb_extif_timing_init(struct ssb_extif *extif, unsigned long ns)
87 {
88 u32 tmp;
89
90 /* Initialize extif so we can get to the LEDs and external UART */
91 extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);
92
93 /* Set timing for the flash */
94 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
95 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;
96 tmp |= DIV_ROUND_UP(120, ns);
97 extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
98
99 /* Set programmable interface timing for external uart */
100 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
101 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;
102 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT;
103 tmp |= DIV_ROUND_UP(120, ns);
104 extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
105 }
106
107 void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
108 u32 *pll_type, u32 *n, u32 *m)
109 {
110 *pll_type = SSB_PLLTYPE_1;
111 *n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
112 *m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
113 }
114
115 void ssb_extif_watchdog_timer_set(struct ssb_extif *extif,
116 u32 ticks)
117 {
118 extif_write32(extif, SSB_EXTIF_WATCHDOG, ticks);
119 }
120
121 u32 ssb_extif_gpio_in(struct ssb_extif *extif, u32 mask)
122 {
123 return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
124 }
125
126 u32 ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
127 {
128 return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUT(0),
129 mask, value);
130 }
131
132 u32 ssb_extif_gpio_outen(struct ssb_extif *extif, u32 mask, u32 value)
133 {
134 return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUTEN(0),
135 mask, value);
136 }
137
138 u32 ssb_extif_gpio_polarity(struct ssb_extif *extif, u32 mask, u32 value)
139 {
140 return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTPOL, mask, value);
141 }
142
143 u32 ssb_extif_gpio_intmask(struct ssb_extif *extif, u32 mask, u32 value)
144 {
145 return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTMASK, mask, value);
146 }
147
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