2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.com>
5 * SPDX-License-Identifier: GPL-2.0+
14 DECLARE_GLOBAL_DATA_PTR
;
17 #define ALTERA_JTAG_RVALID BIT(15) /* Read valid */
19 /* control register */
20 #define ALTERA_JTAG_AC BIT(10) /* activity indicator */
21 #define ALTERA_JTAG_RRDY BIT(12) /* read available */
22 #define ALTERA_JTAG_WSPACE(d) ((d) >> 16) /* Write space avail */
23 /* Write fifo size. FIXME: this should be extracted with sopc2dts */
24 #define ALTERA_JTAG_WRITE_DEPTH 64
26 struct altera_jtaguart_regs
{
27 u32 data
; /* Data register */
28 u32 control
; /* Control register */
31 struct altera_jtaguart_platdata
{
32 struct altera_jtaguart_regs
*regs
;
35 static int altera_jtaguart_setbrg(struct udevice
*dev
, int baudrate
)
40 static int altera_jtaguart_putc(struct udevice
*dev
, const char ch
)
42 struct altera_jtaguart_platdata
*plat
= dev
->platdata
;
43 struct altera_jtaguart_regs
*const regs
= plat
->regs
;
44 u32 st
= readl(®s
->control
);
46 #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
47 if (!(st
& ALTERA_JTAG_AC
)) /* no connection yet */
51 if (ALTERA_JTAG_WSPACE(st
) == 0)
54 writel(ch
, ®s
->data
);
59 static int altera_jtaguart_pending(struct udevice
*dev
, bool input
)
61 struct altera_jtaguart_platdata
*plat
= dev
->platdata
;
62 struct altera_jtaguart_regs
*const regs
= plat
->regs
;
63 u32 st
= readl(®s
->control
);
66 return st
& ALTERA_JTAG_RRDY
? 1 : 0;
68 return !(ALTERA_JTAG_WSPACE(st
) == ALTERA_JTAG_WRITE_DEPTH
);
71 static int altera_jtaguart_getc(struct udevice
*dev
)
73 struct altera_jtaguart_platdata
*plat
= dev
->platdata
;
74 struct altera_jtaguart_regs
*const regs
= plat
->regs
;
77 val
= readl(®s
->data
);
79 if (!(val
& ALTERA_JTAG_RVALID
))
85 static int altera_jtaguart_probe(struct udevice
*dev
)
87 #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
88 struct altera_jtaguart_platdata
*plat
= dev
->platdata
;
89 struct altera_jtaguart_regs
*const regs
= plat
->regs
;
91 writel(ALTERA_JTAG_AC
, ®s
->control
); /* clear AC flag */
96 static int altera_jtaguart_ofdata_to_platdata(struct udevice
*dev
)
98 struct altera_jtaguart_platdata
*plat
= dev_get_platdata(dev
);
100 plat
->regs
= map_physmem(devfdt_get_addr(dev
),
101 sizeof(struct altera_jtaguart_regs
),
107 static const struct dm_serial_ops altera_jtaguart_ops
= {
108 .putc
= altera_jtaguart_putc
,
109 .pending
= altera_jtaguart_pending
,
110 .getc
= altera_jtaguart_getc
,
111 .setbrg
= altera_jtaguart_setbrg
,
114 static const struct udevice_id altera_jtaguart_ids
[] = {
115 { .compatible
= "altr,juart-1.0" },
119 U_BOOT_DRIVER(altera_jtaguart
) = {
120 .name
= "altera_jtaguart",
122 .of_match
= altera_jtaguart_ids
,
123 .ofdata_to_platdata
= altera_jtaguart_ofdata_to_platdata
,
124 .platdata_auto_alloc_size
= sizeof(struct altera_jtaguart_platdata
),
125 .probe
= altera_jtaguart_probe
,
126 .ops
= &altera_jtaguart_ops
,
127 .flags
= DM_FLAG_PRE_RELOC
,
130 #ifdef CONFIG_DEBUG_UART_ALTERA_JTAGUART
132 #include <debug_uart.h>
134 static inline void _debug_uart_init(void)
138 static inline void _debug_uart_putc(int ch
)
140 struct altera_jtaguart_regs
*regs
= (void *)CONFIG_DEBUG_UART_BASE
;
143 u32 st
= readl(®s
->control
);
145 if (ALTERA_JTAG_WSPACE(st
))
149 writel(ch
, ®s
->data
);