diff options
Diffstat (limited to 'drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c')
| -rw-r--r-- | drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c | 94 |
1 files changed, 90 insertions, 4 deletions
diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c b/drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c index 73e2c9c0e549..384396cbb22d 100644 --- a/drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c @@ -18,9 +18,35 @@ #include "../core.h" #include "../pinctrl-utils.h" +#include "pinmux-aspeed.h" #include "pinctrl-aspeed.h" /* + * The "Multi-function Pins Mapping and Control" table in the SoC datasheet + * references registers by the device/offset mnemonic. The register macros + * below are named the same way to ease transcription and verification (as + * opposed to naming them e.g. PINMUX_CTRL_[0-9]). Further, signal expressions + * reference registers beyond those dedicated to pinmux, such as the system + * reset control and MAC clock configuration registers. + */ +#define SCU2C 0x2C /* Misc. Control Register */ +#define SCU3C 0x3C /* System Reset Control/Status Register */ +#define SCU48 0x48 /* MAC Interface Clock Delay Setting */ +#define HW_STRAP1 0x70 /* AST2400 strapping is 33 bits, is split */ +#define HW_REVISION_ID 0x7C /* Silicon revision ID register */ +#define SCU80 0x80 /* Multi-function Pin Control #1 */ +#define SCU84 0x84 /* Multi-function Pin Control #2 */ +#define SCU88 0x88 /* Multi-function Pin Control #3 */ +#define SCU8C 0x8C /* Multi-function Pin Control #4 */ +#define SCU90 0x90 /* Multi-function Pin Control #5 */ +#define SCU94 0x94 /* Multi-function Pin Control #6 */ +#define SCUA0 0xA0 /* Multi-function Pin Control #7 */ +#define SCUA4 0xA4 /* Multi-function Pin Control #8 */ +#define SCUA8 0xA8 /* Multi-function Pin Control #9 */ +#define SCUAC 0xAC /* Multi-function Pin Control #10 */ +#define HW_STRAP2 0xD0 /* Strapping */ + +/* * Uses undefined macros for symbol naming and references, eg GPIOA0, MAC1LINK, * TIMER3 etc. * @@ -2386,13 +2412,73 @@ static const struct aspeed_pin_config aspeed_g4_configs[] = { { PIN_CONFIG_INPUT_DEBOUNCE, { C14, B14 }, SCUA8, 27 }, }; +static int aspeed_g4_sig_expr_set(const struct aspeed_pinmux_data *ctx, + const struct aspeed_sig_expr *expr, + bool enable) +{ + int ret; + int i; + + for (i = 0; i < expr->ndescs; i++) { + const struct aspeed_sig_desc *desc = &expr->descs[i]; + u32 pattern = enable ? desc->enable : desc->disable; + u32 val = (pattern << __ffs(desc->mask)); + + if (!ctx->maps[desc->ip]) + return -ENODEV; + + /* + * Strap registers are configured in hardware or by early-boot + * firmware. Treat them as read-only despite that we can write + * them. This may mean that certain functions cannot be + * deconfigured and is the reason we re-evaluate after writing + * all descriptor bits. + * + * Port D and port E GPIO loopback modes are the only exception + * as those are commonly used with front-panel buttons to allow + * normal operation of the host when the BMC is powered off or + * fails to boot. Once the BMC has booted, the loopback mode + * must be disabled for the BMC to control host power-on and + * reset. + */ + if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP1 && + !(desc->mask & (BIT(21) | BIT(22)))) + continue; + + if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP2) + continue; + + ret = regmap_update_bits(ctx->maps[desc->ip], desc->reg, + desc->mask, val); + + if (ret) + return ret; + } + + ret = aspeed_sig_expr_eval(ctx, expr, enable); + if (ret < 0) + return ret; + + if (!ret) + return -EPERM; + + return 0; +} + +static const struct aspeed_pinmux_ops aspeed_g4_ops = { + .set = aspeed_g4_sig_expr_set, +}; + static struct aspeed_pinctrl_data aspeed_g4_pinctrl_data = { .pins = aspeed_g4_pins, .npins = ARRAY_SIZE(aspeed_g4_pins), - .groups = aspeed_g4_groups, - .ngroups = ARRAY_SIZE(aspeed_g4_groups), - .functions = aspeed_g4_functions, - .nfunctions = ARRAY_SIZE(aspeed_g4_functions), + .pinmux = { + .ops = &aspeed_g4_ops, + .groups = aspeed_g4_groups, + .ngroups = ARRAY_SIZE(aspeed_g4_groups), + .functions = aspeed_g4_functions, + .nfunctions = ARRAY_SIZE(aspeed_g4_functions), + }, .configs = aspeed_g4_configs, .nconfigs = ARRAY_SIZE(aspeed_g4_configs), }; |