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Underclock the SDIO bus on E200 devices.
Signed-off-by: Ariadne Conill <ariadne@dereferenced.org>
Upstream-status: Not yet submitted
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -760,6 +760,28 @@
}
}
+int __init alpine_prune_device_tree(void)
+{
+ if (fdt_check_header(initial_boot_params))
+ panic("Corrupt Device Tree.");
+
+ /* UBNT underclocks the SDIO bus on E200. We do the same here. */
+ if (octeon_bootinfo->board_type == CVMX_BOARD_TYPE_UBNT_E200 || octeon_bootinfo->board_type == CVMX_BOARD_TYPE_UBNT_E220) {
+ int mmc_slot0;
+ u32 freq = 26000000;
+
+ pr_info("UBNT E200 board detected, underclocking SDIO bus.\n");
+
+ mmc_slot0 = fdt_path_offset(initial_boot_params, "/soc/mmc/mmc-slot@0");
+ if (mmc_slot0 > 0) {
+ fdt_setprop_inplace_cell(initial_boot_params, mmc_slot0,
+ "spi-max-frequency", freq);
+ }
+ }
+
+ return 0;
+}
+
int __init octeon_prune_device_tree(void)
{
int i, max_port, uart_mask;
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -1184,6 +1184,7 @@
}
void __init octeon_fill_mac_addresses(void);
+int alpine_prune_device_tree(void);
void __init device_tree_init(void)
{
@@ -1219,6 +1220,9 @@
octeon_prune_device_tree();
pr_info("Using internal Device Tree.\n");
}
+
+ alpine_prune_device_tree();
+
if (fill_mac)
octeon_fill_mac_addresses();
unflatten_and_copy_device_tree();
--- a/arch/mips/include/asm/octeon/cvmx-bootinfo.h
+++ b/arch/mips/include/asm/octeon/cvmx-bootinfo.h
@@ -295,6 +295,9 @@
*/
CVMX_BOARD_TYPE_CUST_PRIVATE_MIN = 20001,
CVMX_BOARD_TYPE_UBNT_E100 = 20002,
+ CVMX_BOARD_TYPE_UBNT_E200 = 20003,
+ CVMX_BOARD_TYPE_UBNT_E120 = 20004,
+ CVMX_BOARD_TYPE_UBNT_E220 = 20005,
CVMX_BOARD_TYPE_CUST_DSR1000N = 20006,
CVMX_BOARD_TYPE_KONTRON_S1901 = 21901,
CVMX_BOARD_TYPE_CUST_PRIVATE_MAX = 30000,
@@ -396,6 +399,9 @@
/* Customer private range */
ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_CUST_PRIVATE_MIN)
ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_UBNT_E100)
+ ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_UBNT_E200)
+ ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_UBNT_E120)
+ ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_UBNT_E220)
ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_CUST_DSR1000N)
ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_KONTRON_S1901)
ENUM_BRD_TYPE_CASE(CVMX_BOARD_TYPE_CUST_PRIVATE_MAX)
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