diff options
| author | Daniel Cederman <cederman@gaisler.com> | 2021-04-30 08:35:56 +0200 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-05-06 14:21:07 +0530 |
| commit | 117fb6dcb147913034fe82d0ed038fa7a05f1a1d (patch) | |
| tree | 9724a5e0e5d52bcc1557fcedb83d359b7172de43 /lib/utils/fdt | |
| parent | 632e27bb91b824974b88dd46f8419729d7f9825d (diff) | |
lib: utils/serial: Add support for Gaisler APBUART
This patch adds support for the UART used by the NOEL-V processor.
Cobham Gaisler's NOEL-V RISC-V processor IP is available under GPL
and commercial license and is described in more detail at
https://www.gaisler.com/noelv.
Signed-off-by: Daniel Cederman <cederman@gaisler.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'lib/utils/fdt')
| -rw-r--r-- | lib/utils/fdt/fdt_helper.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c index 909de01..9143e44 100644 --- a/lib/utils/fdt/fdt_helper.c +++ b/lib/utils/fdt/fdt_helper.c @@ -26,6 +26,8 @@ #define DEFAULT_SIFIVE_UART_REG_SHIFT 0 #define DEFAULT_SIFIVE_UART_REG_IO_WIDTH 4 +#define DEFAULT_GAISLER_UART_REG_IO_WIDTH 4 + #define DEFAULT_SHAKTI_UART_FREQ 50000000 #define DEFAULT_SHAKTI_UART_BAUD 115200 @@ -213,6 +215,44 @@ int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid) return 0; } +int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset, + struct platform_uart_data *uart) +{ + int len, rc; + const fdt32_t *val; + unsigned long reg_addr, reg_size; + + if (nodeoffset < 0 || !uart || !fdt) + return SBI_ENODEV; + + rc = fdt_get_node_addr_size(fdt, nodeoffset, ®_addr, ®_size); + if (rc < 0 || !reg_addr || !reg_size) + return SBI_ENODEV; + uart->addr = reg_addr; + + /** + * UART address is mandatory. clock-frequency and current-speed + * may not be present. Don't return error. + */ + val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len); + if (len > 0 && val) + uart->freq = fdt32_to_cpu(*val); + else + uart->freq = DEFAULT_UART_FREQ; + + val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "current-speed", &len); + if (len > 0 && val) + uart->baud = fdt32_to_cpu(*val); + else + uart->baud = DEFAULT_UART_BAUD; + + /* For Gaisler APBUART, the reg-shift and reg-io-width are fixed .*/ + uart->reg_shift = DEFAULT_UART_REG_SHIFT; + uart->reg_io_width = DEFAULT_GAISLER_UART_REG_IO_WIDTH; + + return 0; +} + int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset, struct platform_uart_data *uart) { |