/* * linux/arch/arm/plat-pxa/mfp.c * * Multi-Function Pin Support * * Copyright (C) 2007 Marvell Internation Ltd. * * 2007-08-21: eric miao * initial version * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #define MFPR_SIZE (PAGE_SIZE) /* MFPR register bit definitions */ #define MFPR_PULL_SEL (0x1 << 15) #define MFPR_PULLUP_EN (0x1 << 14) #define MFPR_PULLDOWN_EN (0x1 << 13) #define MFPR_SLEEP_SEL (0x1 << 9) #define MFPR_SLEEP_OE_N (0x1 << 7) #define MFPR_EDGE_CLEAR (0x1 << 6) #define MFPR_EDGE_FALL_EN (0x1 << 5) #define MFPR_EDGE_RISE_EN (0x1 << 4) #define MFPR_SLEEP_DATA(x) ((x) << 8) #define MFPR_DRIVE(x) (((x) & 0x7) << 10) #define MFPR_AF_SEL(x) (((x) & 0x7) << 0) #define MFPR_EDGE_NONE (0) #define MFPR_EDGE_RISE (MFPR_EDGE_RISE_EN) #define MFPR_EDGE_FALL (MFPR_EDGE_FALL_EN) #define MFPR_EDGE_BOTH (MFPR_EDGE_RISE | MFPR_EDGE_FALL) /* * Table that determines the low power modes outputs, with actual settings * used in parentheses for don't-care values. Except for the float output, * the configured driven and pulled levels match, so if there is a need for * non-LPM pulled output, the same configuration could probably be used. * * Output value sleep_oe_n sleep_data pullup_en pulldown_en pull_sel * (bit 7) (bit 8) (bit 14) (bit 13) (bit 15) * * Input 0 X(0) X(0) X(0) 0 * Drive 0 0 0 0 X(1) 0 * Drive 1 0 1 X(1) 0 0 * Pull hi (1) 1 X(1) 1 0 0 * Pull lo (0) 1 X(0) 0 1 0 * Z (float) 1 X(0) 0 0 0 */ #define MFPR_LPM_INPUT (0) #define MFPR_LPM_DRIVE_LOW (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN) #define MFPR_LPM_DRIVE_HIGH (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN) #define MFPR_LPM_PULL_LOW (MFPR_LPM_DRIVE_LOW | MFPR_SLEEP_OE_N) #define MFPR_LPM_PULL_HIGH (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N) #define MFPR_LPM_FLOAT (MFPR_SLEEP_OE_N) #define MFPR_LPM_MASK (0xe080) /* * The pullup and pulldown state of the MFP pin at run mode is by default * determined by the selected alternate function. In case that some buggy * devices need to override this default behavior, the definitions below * indicates the setting of corresponding MFPR bits * * Definition pull_sel pullup_en pulldown_en * MFPR_PULL_NONE 0 0 0 * MFPR_PULL_LOW 1 0 1 * MFPR_PULL_HIGH 1 1 0 * MFPR_PULL_BOTH 1 1 1 * MFPR_PULL_FLOAT 1 0 0 */ #define MFPR_PULL_NONE (0) #define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN) #define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN) #define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN) #define MFPR_PULL_FLOAT (MFPR_PULL_SEL) /* mfp_spin_lock is used to ensure that MFP register configuration * (most likely a read-modify-write operation) is atomic, and that * mfp_table[] is consistent */ static void __iomem *mfpr_mmio_base; struct mfp_pin { unsigned long config; /* -1 for not configured */ unsigned long mfpr_off; /* MFPRxx Register offset */ unsigned long mfpr_run; /* Run-Mode Register Value */ unsigned long mfpr_lpm; /* Low Power Mode Register Value */ }; static struct mfp_pin mfp_table[MFP_PIN_MAX]; /* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */ static const unsigned long mfpr_lpm[] = { MFPR_LPM_INPUT, MFPR_LPM_DRIVE_LOW, MFPR_LPM_DRIVE_HIGH, MFPR_LPM_PULL_LOW, MFPR_LPM_PULL_HIGH, MFPR_LPM_FLOAT, MFPR_LPM_INPUT, }; /* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */ static const unsigned long mfpr_pull[] = { MFPR_PULL_NONE, MFPR_PULL_LOW, MFPR_PULL_HIGH, MFPR_PULL_BOTH, MFPR_PULL_FLOAT, }; /* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */ static const unsigned long mfpr_edge[] = { MFPR_EDGE_NONE, MFPR_EDGE_RISE, MFPR_EDGE_FALL, MFPR_EDGE_BOTH, }; #define mfpr_readl(off) \ __raw_readl(mfpr_mmio_base + (off)) #define mfpr_writel(off, val) \ __raw_writel(val, mfpr_mmio_base + (off)) #define mfp_configured(p) ((p)->config != -1) /* * perform a read-back of any valid MFPR register to make sure the * previous writings are finished */ static unsigned long mfpr_off_readback; #define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + mfpr_off_readback) static inline void __mfp_config_run(struct mfp_pin *p) { if (mfp_configured(p)) mfpr_writel(p->mfpr_off, p->mfpr_run); } static inline void __mfp_config_lpm(struct mfp_pin *p) { if (mfp_configured(p)) { unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR; if (mfpr_clr != p->mfpr_run) mfpr_writel(p->mfpr_off, mfpr_clr); if (p->mfpr_lpm != mfpr_clr) mfpr_writel(p->mfpr_off, p->mfpr_lpm); } } void mfp_config(unsigned long *mfp_cfgs, int num) { int i; for (i = 0; i < num; i++, mfp_cfgs++) { unsigned long tmp, c = *mfp_cfgs; struct mfp_pin *p; int pin, af, drv, lpm, edge, pull; pin = MFP_PIN(c); BUG_ON(pin >= MFP_PIN_MAX); p = &mfp_table[pin]; af = MFP_AF(c); drv = MFP_DS(c); lpm = MFP_LPM_STATE(c); edge = MFP_LPM_EDGE(c); pull = MFP_PULL(c); /* run-mode pull settings will conflict with MFPR bits of * low power mode state, calculate mfpr_run and mfpr_lpm * individually if pull != MFP_PULL_NONE */ tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv); if (likely(pull == MFP_PULL_NONE)) { p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; p->mfpr_lpm = p->mfpr_run; } else { p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; p->mfpr_run = tmp | mfpr_pull[pull]; } p->config = c; __mfp_config_run(p); } mfpr_sync(); } unsigned long mfp_read(int mfp) { unsigned long val; BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); val = mfpr_readl(mfp_table[mfp].mfpr_off); return val; } void mfp_write(int mfp, unsigned long val) { BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); mfpr_writel(mfp_table[mfp].mfpr_off, val); mfpr_sync(); } void __init mfp_init_base(void __iomem *mfpr_base) { int i; /* initialize the table with default - unconfigured */ for (i = 0; i < ARRAY_SIZE(mfp_table); i++) mfp_table[i].config = -1; mfpr_mmio_base = mfpr_base; } void __init mfp_init_addr(struct mfp_addr_map *map) { struct mfp_addr_map *p; unsigned long offset; int i; /* mfp offset for readback */ mfpr_off_readback = map[0].offset; for (p = map; p->start != MFP_PIN_INVALID; p++) { offset = p->offset; i = p->start; do { mfp_table[i].mfpr_off = offset; mfp_table[i].mfpr_run = 0; mfp_table[i].mfpr_lpm = 0; offset += 4; i++; } while ((i <= p->end) && (p->end != -1)); } } void mfp_config_lpm(void) { struct mfp_pin *p = &mfp_table[0]; int pin; for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) __mfp_config_lpm(p); } void mfp_config_run(void) { struct mfp_pin *p = &mfp_table[0]; int pin; for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) __mfp_config_run(p); } static struct mfp_addr_map pxa300_mfp_addr_map[] __initdata = { MFP_ADDR_X(GPIO0, GPIO2, 0x00b4), MFP_ADDR_X(GPIO3, GPIO26, 0x027c), MFP_ADDR_X(GPIO27, GPIO98, 0x0400), MFP_ADDR_X(GPIO99, GPIO127, 0x0600), MFP_ADDR_X(GPIO0_2, GPIO1_2, 0x0674), MFP_ADDR_X(GPIO2_2, GPIO6_2, 0x02dc), MFP_ADDR(nBE0, 0x0204), MFP_ADDR(nBE1, 0x0208), MFP_ADDR(nLUA, 0x0244), MFP_ADDR(nLLA, 0x0254), MFP_ADDR(DF_CLE_nOE, 0x0240), MFP_ADDR(DF_nRE_nOE, 0x0200), MFP_ADDR(DF_ALE_nWE, 0x020C), MFP_ADDR(DF_INT_RnB, 0x00C8), MFP_ADDR(DF_nCS0, 0x0248), MFP_ADDR(DF_nCS1, 0x0278), MFP_ADDR(DF_nWE, 0x00CC), MFP_ADDR(DF_ADDR0, 0x0210), MFP_ADDR(DF_ADDR1, 0x0214), MFP_ADDR(DF_ADDR2, 0x0218), MFP_ADDR(DF_ADDR3, 0x021C), MFP_ADDR(DF_IO0, 0x0220), MFP_ADDR(DF_IO1, 0x0228), MFP_ADDR(DF_IO2, 0x0230), MFP_ADDR(DF_IO3, 0x0238), MFP_ADDR(DF_IO4, 0x0258), MFP_ADDR(DF_IO5, 0x0260), MFP_ADDR(DF_IO6, 0x0268), MFP_ADDR(DF_IO7, 0x0270), MFP_ADDR(DF_IO8, 0x0224), MFP_ADDR(DF_IO9, 0x022C), MFP_ADDR(DF_IO10, 0x0234), MFP_ADDR(DF_IO11, 0x023C), MFP_ADDR(DF_IO12, 0x025C), MFP_ADDR(DF_IO13, 0x0264), MFP_ADDR(DF_IO14, 0x026C), MFP_ADDR(DF_IO15, 0x0274), MFP_ADDR_END, }; /* override pxa300 MFP register addresses */ static struct mfp_addr_map pxa310_mfp_addr_map[] __initdata = { MFP_ADDR_X(GPIO30, GPIO98, 0x0418), MFP_ADDR_X(GPIO7_2, GPIO12_2, 0x052C), MFP_ADDR(ULPI_STP, 0x040C), MFP_ADDR(ULPI_NXT, 0x0410), MFP_ADDR(ULPI_DIR, 0x0414), MFP_ADDR_END, }; void mfp_init(void) { mfp_init_base((void __iomem *)MFPR_BASE); mfp_init_addr(pxa300_mfp_addr_map); if (cpu_is_pxa310()) mfp_init_addr(pxa310_mfp_addr_map); }