diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.h b/drivers/pinctrl/aspeed/pinctrl-aspeed.h index b7790395aead..7fcfc5004b44 100644 --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.h +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.h @@ -18,504 +18,6 @@ #include "pinmux-aspeed.h" -/* - * The ASPEED SoCs provide typically more than 200 pins for GPIO and other - * functions. The SoC function enabled on a pin is determined on a priority - * basis where a given pin can provide a number of different signal types. - * - * The signal active on a pin is described by both a priority level and - * compound logical expressions involving multiple operators, registers and - * bits. Some difficulty arises as the pin's function bit masks for each - * priority level are frequently not the same (i.e. cannot just flip a bit to - * change from a high to low priority signal), or even in the same register. - * Further, not all signals can be unmuxed, as some expressions depend on - * values in the hardware strapping register (which is treated as read-only). - * - * SoC Multi-function Pin Expression Examples - * ------------------------------------------ - * - * Here are some sample mux configurations from the AST2400 and AST2500 - * datasheets to illustrate the corner cases, roughly in order of least to most - * corner. The signal priorities are in decending order from P0 (highest). - * - * D6 is a pin with a single function (beside GPIO); a high priority signal - * that participates in one function: - * - * Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * D6 GPIOA0 MAC1LINK SCU80[0]=1 GPIOA0 - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * - * C5 is a multi-signal pin (high and low priority signals). Here we touch - * different registers for the different functions that enable each signal: - * - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * C5 GPIOA4 SCL9 SCU90[22]=1 TIMER5 SCU80[4]=1 GPIOA4 - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * - * E19 is a single-signal pin with two functions that influence the active - * signal. In this case both bits have the same meaning - enable a dedicated - * LPC reset pin. However it's not always the case that the bits in the - * OR-relationship have the same meaning. - * - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * E19 GPIOB4 LPCRST# SCU80[12]=1 | Strap[14]=1 GPIOB4 - * -----+---------+-----------+-----------------------------+-----------+---------------+---------- - * - * For example, pin B19 has a low-priority signal that's enabled by two - * distinct SoC functions: A specific SIOPBI bit in register SCUA4, and an ACPI - * bit in the STRAP register. The ACPI bit configures signals on pins in - * addition to B19. Both of the low priority functions as well as the high - * priority function must be disabled for GPIOF1 to be used. - * - * Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other - * -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+---------- - * B19 GPIOF1 NDCD4 SCU80[25]=1 SIOPBI# SCUA4[12]=1 | Strap[19]=0 GPIOF1 - * -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+---------- - * - * For pin E18, the SoC ANDs the expected state of three bits to determine the - * pin's active signal: - * - * * SCU3C[3]: Enable external SOC reset function - * * SCU80[15]: Enable SPICS1# or EXTRST# function pin - * * SCU90[31]: Select SPI interface CS# output - * - * -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+---------- - * E18 GPIOB7 EXTRST# SCU3C[3]=1 & SCU80[15]=1 & SCU90[31]=0 SPICS1# SCU3C[3]=1 & SCU80[15]=1 & SCU90[31]=1 GPIOB7 - * -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+---------- - * - * (Bits SCU3C[3] and SCU80[15] appear to only be used in the expressions for - * selecting the signals on pin E18) - * - * Pin T5 is a multi-signal pin with a more complex configuration: - * - * Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * T5 GPIOL1 VPIDE SCU90[5:4]!=0 & SCU84[17]=1 NDCD1 SCU84[17]=1 GPIOL1 - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * - * The high priority signal configuration is best thought of in terms of its - * exploded form, with reference to the SCU90[5:4] bits: - * - * * SCU90[5:4]=00: disable - * * SCU90[5:4]=01: 18 bits (R6/G6/B6) video mode. - * * SCU90[5:4]=10: 24 bits (R8/G8/B8) video mode. - * * SCU90[5:4]=11: 30 bits (R10/G10/B10) video mode. - * - * Re-writing: - * - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * T5 GPIOL1 VPIDE (SCU90[5:4]=1 & SCU84[17]=1) NDCD1 SCU84[17]=1 GPIOL1 - * | (SCU90[5:4]=2 & SCU84[17]=1) - * | (SCU90[5:4]=3 & SCU84[17]=1) - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * - * For reference the SCU84[17] bit configure the "UART1 NDCD1 or Video VPIDE - * function pin", where the signal itself is determined by whether SCU94[5:4] - * is disabled or in one of the 18, 24 or 30bit video modes. - * - * Other video-input-related pins require an explicit state in SCU90[5:4], e.g. - * W1 and U5: - * - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * W1 GPIOL6 VPIB0 SCU90[5:4]=3 & SCU84[22]=1 TXD1 SCU84[22]=1 GPIOL6 - * U5 GPIOL7 VPIB1 SCU90[5:4]=3 & SCU84[23]=1 RXD1 SCU84[23]=1 GPIOL7 - * -----+---------+-----------+------------------------------+-----------+---------------+---------- - * - * The examples of T5 and W1 are particularly fertile, as they also demonstrate - * that despite operating as part of the video input bus each signal needs to - * be enabled individually via it's own SCU84 (in the cases of T5 and W1) - * register bit. This is a little crazy if the bus doesn't have optional - * signals, but is used to decent effect with some of the UARTs where not all - * signals are required. However, this isn't done consistently - UART1 is - * enabled on a per-pin basis, and by contrast, all signals for UART6 are - * enabled by a single bit. - * - * Further, the high and low priority signals listed in the table above share - * a configuration bit. The VPI signals should operate in concert in a single - * function, but the UART signals should retain the ability to be configured - * independently. This pushes the implementation down the path of tagging a - * signal's expressions with the function they participate in, rather than - * defining masks affecting multiple signals per function. The latter approach - * fails in this instance where applying the configuration for the UART pin of - * interest will stomp on the state of other UART signals when disabling the - * VPI functions on the current pin. - * - * Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other - * -----+------------+-----------+---------------------------+-----------+---------------+------------ - * A12 RGMII1TXCK GPIOT0 SCUA0[0]=1 RMII1TXEN Strap[6]=0 RGMII1TXCK - * B12 RGMII1TXCTL GPIOT1 SCUA0[1]=1 – Strap[6]=0 RGMII1TXCTL - * -----+------------+-----------+---------------------------+-----------+---------------+------------ - * - * A12 demonstrates that the "Other" signal isn't always GPIO - in this case - * GPIOT0 is a high-priority signal and RGMII1TXCK is Other. Thus, GPIO - * should be treated like any other signal type with full function expression - * requirements, and not assumed to be the default case. Separately, GPIOT0 and - * GPIOT1's signal descriptor bits are distinct, therefore we must iterate all - * pins in the function's group to disable the higher-priority signals such - * that the signal for the function of interest is correctly enabled. - * - * Finally, three priority levels aren't always enough; the AST2500 brings with - * it 18 pins of five priority levels, however the 18 pins only use three of - * the five priority levels. - * - * Ultimately the requirement to control pins in the examples above drive the - * design: - * - * * Pins provide signals according to functions activated in the mux - * configuration - * - * * Pins provide up to five signal types in a priority order - * - * * For priorities levels defined on a pin, each priority provides one signal - * - * * Enabling lower priority signals requires higher priority signals be - * disabled - * - * * A function represents a set of signals; functions are distinct if their - * sets of signals are not equal - * - * * Signals participate in one or more functions - * - * * A function is described by an expression of one or more signal - * descriptors, which compare bit values in a register - * - * * A signal expression is the smallest set of signal descriptors whose - * comparisons must evaluate 'true' for a signal to be enabled on a pin. - * - * * A function's signal is active on a pin if evaluating all signal - * descriptors in the pin's signal expression for the function yields a 'true' - * result - * - * * A signal at a given priority on a given pin is active if any of the - * functions in which the signal participates are active, and no higher - * priority signal on the pin is active - * - * * GPIO is configured per-pin - * - * And so: - * - * * To disable a signal, any function(s) activating the signal must be - * disabled - * - * * Each pin must know the signal expressions of functions in which it - * participates, for the purpose of enabling the Other function. This is done - * by deactivating all functions that activate higher priority signals on the - * pin. - * - * As a concrete example: - * - * * T5 provides three signals types: VPIDE, NDCD1 and GPIO - * - * * The VPIDE signal participates in 3 functions: VPI18, VPI24 and VPI30 - * - * * The NDCD1 signal participates in just its own NDCD1 function - * - * * VPIDE is high priority, NDCD1 is low priority, and GPIOL1 is the least - * prioritised - * - * * The prerequisit for activating the NDCD1 signal is that the VPI18, VPI24 - * and VPI30 functions all be disabled - * - * * Similarly, all of VPI18, VPI24, VPI30 and NDCD1 functions must be disabled - * to provide GPIOL6 - * - * Considerations - * -------------- - * - * If pinctrl allows us to allocate a pin we can configure a function without - * concern for the function of already allocated pins, if pin groups are - * created with respect to the SoC functions in which they participate. This is - * intuitive, but it did not feel obvious from the bit/pin relationships. - * - * Conversely, failing to allocate all pins in a group indicates some bits (as - * well as pins) required for the group's configuration will already be in use, - * likely in a way that's inconsistent with the requirements of the failed - * group. - */ - -#define ASPEED_IP_SCU 0 -#define ASPEED_IP_GFX 1 -#define ASPEED_IP_LPC 2 -#define ASPEED_NR_PINMUX_IPS 3 - -/* - * 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. The AST2500 goes a step - * further and references registers in the graphics IP block. - */ -#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 */ - - /** - * A signal descriptor, which describes the register, bits and the - * enable/disable values that should be compared or written. - * - * @ip: The IP block identifier, used as an index into the regmap array in - * struct aspeed_pinctrl_data - * @reg: The register offset with respect to the base address of the IP block - * @mask: The mask to apply to the register. The lowest set bit of the mask is - * used to derive the shift value. - * @enable: The value that enables the function. Value should be in the LSBs, - * not at the position of the mask. - * @disable: The value that disables the function. Value should be in the - * LSBs, not at the position of the mask. - */ -struct aspeed_sig_desc { - unsigned int ip; - unsigned int reg; - u32 mask; - u32 enable; - u32 disable; -}; - -/** - * Describes a signal expression. The expression is evaluated by ANDing the - * evaluation of the descriptors. - * - * @signal: The signal name for the priority level on the pin. If the signal - * type is GPIO, then the signal name must begin with the string - * "GPIO", e.g. GPIOA0, GPIOT4 etc. - * @function: The name of the function the signal participates in for the - * associated expression - * @ndescs: The number of signal descriptors in the expression - * @descs: Pointer to an array of signal descriptors that comprise the - * function expression - */ -struct aspeed_sig_expr { - const char *signal; - const char *function; - int ndescs; - const struct aspeed_sig_desc *descs; -}; - -/** - * A struct capturing the list of expressions enabling signals at each priority - * for a given pin. The signal configuration for a priority level is evaluated - * by ORing the evaluation of the signal expressions in the respective - * priority's list. - * - * @name: A name for the pin - * @prios: A pointer to an array of expression list pointers - * - */ -struct aspeed_pin_desc { - const char *name; - const struct aspeed_sig_expr ***prios; -}; - -/* Macro hell */ - -#define SIG_DESC_IP_BIT(ip, reg, idx, val) \ - { ip, reg, BIT_MASK(idx), val, (((val) + 1) & 1) } - -/** - * Short-hand macro for describing an SCU descriptor enabled by the state of - * one bit. The disable value is derived. - * - * @reg: The signal's associated register, offset from base - * @idx: The signal's bit index in the register - * @val: The value (0 or 1) that enables the function - */ -#define SIG_DESC_BIT(reg, idx, val) \ - SIG_DESC_IP_BIT(ASPEED_IP_SCU, reg, idx, val) - -#define SIG_DESC_IP_SET(ip, reg, idx) SIG_DESC_IP_BIT(ip, reg, idx, 1) - -/** - * A further short-hand macro expanding to an SCU descriptor enabled by a set - * bit. - * - * @reg: The register, offset from base - * @idx: The bit index in the register - */ -#define SIG_DESC_SET(reg, idx) SIG_DESC_IP_BIT(ASPEED_IP_SCU, reg, idx, 1) - -#define SIG_DESC_LIST_SYM(sig, func) sig_descs_ ## sig ## _ ## func -#define SIG_DESC_LIST_DECL(sig, func, ...) \ - static const struct aspeed_sig_desc SIG_DESC_LIST_SYM(sig, func)[] = \ - { __VA_ARGS__ } - -#define SIG_EXPR_SYM(sig, func) sig_expr_ ## sig ## _ ## func -#define SIG_EXPR_DECL_(sig, func) \ - static const struct aspeed_sig_expr SIG_EXPR_SYM(sig, func) = \ - { \ - .signal = #sig, \ - .function = #func, \ - .ndescs = ARRAY_SIZE(SIG_DESC_LIST_SYM(sig, func)), \ - .descs = &(SIG_DESC_LIST_SYM(sig, func))[0], \ - } - -/** - * Declare a signal expression. - * - * @sig: A macro symbol name for the signal (is subjected to stringification - * and token pasting) - * @func: The function in which the signal is participating - * @...: Signal descriptors that define the signal expression - * - * For example, the following declares the ROMD8 signal for the ROM16 function: - * - * SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6)); - * - * And with multiple signal descriptors: - * - * SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4), - * { HW_STRAP1, GENMASK(1, 0), 0, 0 }); - */ -#define SIG_EXPR_DECL(sig, func, ...) \ - SIG_DESC_LIST_DECL(sig, func, __VA_ARGS__); \ - SIG_EXPR_DECL_(sig, func) - -/** - * Declare a pointer to a signal expression - * - * @sig: The macro symbol name for the signal (subjected to token pasting) - * @func: The macro symbol name for the function (subjected to token pasting) - */ -#define SIG_EXPR_PTR(sig, func) (&SIG_EXPR_SYM(sig, func)) - -#define SIG_EXPR_LIST_SYM(sig) sig_exprs_ ## sig - -/** - * Declare a signal expression list for reference in a struct aspeed_pin_prio. - * - * @sig: A macro symbol name for the signal (is subjected to token pasting) - * @...: Signal expression structure pointers (use SIG_EXPR_PTR()) - * - * For example, the 16-bit ROM bus can be enabled by one of two possible signal - * expressions: - * - * SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6)); - * SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4), - * { HW_STRAP1, GENMASK(1, 0), 0, 0 }); - * SIG_EXPR_LIST_DECL(ROMD8, SIG_EXPR_PTR(ROMD8, ROM16), - * SIG_EXPR_PTR(ROMD8, ROM16S)); - */ -#define SIG_EXPR_LIST_DECL(sig, ...) \ - static const struct aspeed_sig_expr *SIG_EXPR_LIST_SYM(sig)[] = \ - { __VA_ARGS__, NULL } - -/** - * A short-hand macro for declaring a function expression and an expression - * list with a single function. - * - * @func: A macro symbol name for the function (is subjected to token pasting) - * @...: Function descriptors that define the function expression - * - * For example, signal NCTS6 participates in its own function with one group: - * - * SIG_EXPR_LIST_DECL_SINGLE(NCTS6, NCTS6, SIG_DESC_SET(SCU90, 7)); - */ -#define SIG_EXPR_LIST_DECL_SINGLE(sig, func, ...) \ - SIG_DESC_LIST_DECL(sig, func, __VA_ARGS__); \ - SIG_EXPR_DECL_(sig, func); \ - SIG_EXPR_LIST_DECL(sig, SIG_EXPR_PTR(sig, func)) - -#define SIG_EXPR_LIST_DECL_DUAL(sig, f0, f1) \ - SIG_EXPR_LIST_DECL(sig, SIG_EXPR_PTR(sig, f0), SIG_EXPR_PTR(sig, f1)) - -#define SIG_EXPR_LIST_PTR(sig) (&SIG_EXPR_LIST_SYM(sig)[0]) - -#define PIN_EXPRS_SYM(pin) pin_exprs_ ## pin -#define PIN_EXPRS_PTR(pin) (&PIN_EXPRS_SYM(pin)[0]) -#define PIN_SYM(pin) pin_ ## pin - -#define MS_PIN_DECL_(pin, ...) \ - static const struct aspeed_sig_expr **PIN_EXPRS_SYM(pin)[] = \ - { __VA_ARGS__, NULL }; \ - static const struct aspeed_pin_desc PIN_SYM(pin) = \ - { #pin, PIN_EXPRS_PTR(pin) } - -/** - * Declare a multi-signal pin - * - * @pin: The pin number - * @other: Macro name for "other" functionality (subjected to stringification) - * @high: Macro name for the highest priority signal functions - * @low: Macro name for the low signal functions - * - * For example: - * - * #define A8 56 - * SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6)); - * SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4), - * { HW_STRAP1, GENMASK(1, 0), 0, 0 }); - * SIG_EXPR_LIST_DECL(ROMD8, SIG_EXPR_PTR(ROMD8, ROM16), - * SIG_EXPR_PTR(ROMD8, ROM16S)); - * SIG_EXPR_LIST_DECL_SINGLE(NCTS6, NCTS6, SIG_DESC_SET(SCU90, 7)); - * MS_PIN_DECL(A8, GPIOH0, ROMD8, NCTS6); - */ -#define MS_PIN_DECL(pin, other, high, low) \ - SIG_EXPR_LIST_DECL_SINGLE(other, other); \ - MS_PIN_DECL_(pin, \ - SIG_EXPR_LIST_PTR(high), \ - SIG_EXPR_LIST_PTR(low), \ - SIG_EXPR_LIST_PTR(other)) - -#define PIN_GROUP_SYM(func) pins_ ## func -#define FUNC_GROUP_SYM(func) groups_ ## func -#define FUNC_GROUP_DECL(func, ...) \ - static const int PIN_GROUP_SYM(func)[] = { __VA_ARGS__ }; \ - static const char *FUNC_GROUP_SYM(func)[] = { #func } - -/** - * Declare a single signal pin - * - * @pin: The pin number - * @other: Macro name for "other" functionality (subjected to stringification) - * @sig: Macro name for the signal (subjected to stringification) - * - * For example: - * - * #define E3 80 - * SIG_EXPR_LIST_DECL_SINGLE(SCL5, I2C5, I2C5_DESC); - * SS_PIN_DECL(E3, GPIOK0, SCL5); - */ -#define SS_PIN_DECL(pin, other, sig) \ - SIG_EXPR_LIST_DECL_SINGLE(other, other); \ - MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(sig), SIG_EXPR_LIST_PTR(other)) - -/** - * Single signal, single function pin declaration - * - * @pin: The pin number - * @other: Macro name for "other" functionality (subjected to stringification) - * @sig: Macro name for the signal (subjected to stringification) - * @...: Signal descriptors that define the function expression - * - * For example: - * - * SSSF_PIN_DECL(A4, GPIOA2, TIMER3, SIG_DESC_SET(SCU80, 2)); - */ -#define SSSF_PIN_DECL(pin, other, sig, ...) \ - SIG_EXPR_LIST_DECL_SINGLE(sig, sig, __VA_ARGS__); \ - SIG_EXPR_LIST_DECL_SINGLE(other, other); \ - MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(sig), SIG_EXPR_LIST_PTR(other)); \ - FUNC_GROUP_DECL(sig, pin) - -#define GPIO_PIN_DECL(pin, gpio) \ - SIG_EXPR_LIST_DECL_SINGLE(gpio, gpio); \ - MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(gpio)) - /** * @param The pinconf parameter type * @pins The pin range this config struct covers, [low, high]