aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm47xx/patches-3.0/0006-bcma-add-serial-console-support.patch
blob: 78724ee695672935ee486162495886694815e6b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
From b7c100827012ba588089807475affe0c69a3f817 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Mon, 6 Jun 2011 00:07:33 +0200
Subject: [PATCH 06/14] bcma: add serial console support

This adds support for serial console to bcma, when operating on an
embedded device.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/bcma/bcma_private.h           |    6 +++
 drivers/bcma/driver_chipcommon.c      |   64 +++++++++++++++++++++++++++++++++
 drivers/bcma/driver_mips.c            |    9 +++++
 include/linux/bcma/bcma_driver_mips.h |   11 ++++++
 4 files changed, 90 insertions(+), 0 deletions(-)

--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -29,6 +29,12 @@ void bcma_init_bus(struct bcma_bus *bus)
 /* sprom.c */
 int bcma_sprom_get(struct bcma_bus *bus);
 
+/* driver_chipcommon.c */
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+extern int bcma_chipco_serial_init(struct bcma_drv_cc *cc,
+				   struct bcma_drv_mips_serial_port *ports);
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
+
 #ifdef CONFIG_BCMA_HOST_PCI
 /* host_pci.c */
 extern int __init bcma_host_pci_init(void);
--- a/drivers/bcma/driver_chipcommon.c
+++ b/drivers/bcma/driver_chipcommon.c
@@ -92,3 +92,67 @@ u32 bcma_chipco_gpio_polarity(struct bcm
 {
 	return bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
 }
+
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+int bcma_chipco_serial_init(struct bcma_drv_cc *cc,
+			    struct bcma_drv_mips_serial_port *ports)
+{
+	int nr_ports = 0;
+	u32 plltype;
+	unsigned int irq;
+	u32 baud_base, div;
+	u32 i, n;
+	unsigned int ccrev = cc->core->id.rev;
+
+	plltype = (cc->capabilities & BCMA_CC_CAP_PLLT);
+	irq = bcma_core_mips_irq(cc->core);
+
+	if ((ccrev >= 11) && (ccrev != 15) && (ccrev != 20)) {
+		/* Fixed ALP clock */
+		baud_base = 20000000;
+		if (cc->capabilities & BCMA_CC_CAP_PMU) {
+			/* FIXME: baud_base is different for devices with a PMU */
+			WARN_ON(1);
+		}
+		div = 1;
+		if (ccrev >= 21) {
+			/* Turn off UART clock before switching clocksource. */
+			bcma_cc_write32(cc, BCMA_CC_CORECTL,
+				       bcma_cc_read32(cc, BCMA_CC_CORECTL)
+				       & ~BCMA_CC_CORECTL_UARTCLKEN);
+		}
+		/* Set the override bit so we don't divide it */
+		bcma_cc_write32(cc, BCMA_CC_CORECTL,
+			       bcma_cc_read32(cc, BCMA_CC_CORECTL)
+			       | BCMA_CC_CORECTL_UARTCLK0);
+		if (ccrev >= 21) {
+			/* Re-enable the UART clock. */
+			bcma_cc_write32(cc, BCMA_CC_CORECTL,
+				       bcma_cc_read32(cc, BCMA_CC_CORECTL)
+				       | BCMA_CC_CORECTL_UARTCLKEN);
+		}
+	} else
+		pr_err("serial not supported on this device ccrev: 0x%x\n",
+		       ccrev);
+
+	/* Determine the registers of the UARTs */
+	n = (cc->capabilities & BCMA_CC_CAP_NRUART);
+	for (i = 0; i < n; i++) {
+		void __iomem *cc_mmio;
+		void __iomem *uart_regs;
+
+		cc_mmio = cc->core->bus->mmio +
+			  (cc->core->core_index * BCMA_CORE_SIZE);
+		uart_regs = cc_mmio + BCMA_CC_UART0_DATA;
+		uart_regs += (i * 256);
+
+		nr_ports++;
+		ports[i].regs = uart_regs;
+		ports[i].irq = irq;
+		ports[i].baud_base = baud_base;
+		ports[i].reg_shift = 0;
+	}
+
+	return nr_ports;
+}
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -157,6 +157,14 @@ static void bcma_core_mips_dump_irq(stru
 	}
 }
 
+static void bcma_core_mips_serial_init(struct bcma_drv_mips *mcore)
+{
+	struct bcma_bus *bus = mcore->core->bus;
+
+	mcore->nr_serial_ports = bcma_chipco_serial_init(&bus->drv_cc,
+							 mcore->serial_ports);
+}
+
 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
 {
 	struct bcma_bus *bus = mcore->core->bus;
@@ -229,6 +237,7 @@ void bcma_core_mips_init(struct bcma_drv
 	if (mcore->setup_done)
 		return;
 
+	bcma_core_mips_serial_init(mcore);
 	bcma_core_mips_flash_detect(mcore);
 	mcore->setup_done = true;
 }
--- a/include/linux/bcma/bcma_driver_mips.h
+++ b/include/linux/bcma/bcma_driver_mips.h
@@ -32,11 +32,22 @@
 
 struct bcma_device;
 
+struct bcma_drv_mips_serial_port {
+	void *regs;
+	unsigned long clockspeed;
+	unsigned int irq;
+	unsigned int baud_base;
+	unsigned int reg_shift;
+};
+
 struct bcma_drv_mips {
 	struct bcma_device *core;
 	u8 setup_done:1;
 	unsigned int assigned_irqs;
 
+	int nr_serial_ports;
+	struct bcma_drv_mips_serial_port serial_ports[4];
+
 	u8 flash_buswidth;
 	u32 flash_window;
 	u32 flash_window_size;