/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2013-2014 Ruslan Bukin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Vybrid Family Clock Controller Module (CCM) * Chapter 10, Vybrid Reference Manual, Rev. 5, 07/2013 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CCM_CCR 0x00 /* Control Register */ #define CCM_CSR 0x04 /* Status Register */ #define CCM_CCSR 0x08 /* Clock Switcher Register */ #define CCM_CACRR 0x0C /* ARM Clock Root Register */ #define CCM_CSCMR1 0x10 /* Serial Clock Multiplexer Register 1 */ #define CCM_CSCDR1 0x14 /* Serial Clock Divider Register 1 */ #define CCM_CSCDR2 0x18 /* Serial Clock Divider Register 2 */ #define CCM_CSCDR3 0x1C /* Serial Clock Divider Register 3 */ #define CCM_CSCMR2 0x20 /* Serial Clock Multiplexer Register 2 */ #define CCM_CTOR 0x28 /* Testing Observability Register */ #define CCM_CLPCR 0x2C /* Low Power Control Register */ #define CCM_CISR 0x30 /* Interrupt Status Register */ #define CCM_CIMR 0x34 /* Interrupt Mask Register */ #define CCM_CCOSR 0x38 /* Clock Output Source Register */ #define CCM_CGPR 0x3C /* General Purpose Register */ #define CCM_CCGRN 12 #define CCM_CCGR(n) (0x40 + (n * 0x04)) /* Clock Gating Register */ #define CCM_CMEOR(n) (0x70 + (n * 0x70)) /* Module Enable Override */ #define CCM_CCPGR(n) (0x90 + (n * 0x04)) /* Platform Clock Gating */ #define CCM_CPPDSR 0x88 /* PLL PFD Disable Status Register */ #define CCM_CCOWR 0x8C /* CORE Wakeup Register */ #define PLL3_PFD4_EN (1U << 31) #define PLL3_PFD3_EN (1 << 30) #define PLL3_PFD2_EN (1 << 29) #define PLL3_PFD1_EN (1 << 28) #define PLL2_PFD4_EN (1 << 15) #define PLL2_PFD3_EN (1 << 14) #define PLL2_PFD2_EN (1 << 13) #define PLL2_PFD1_EN (1 << 12) #define PLL1_PFD4_EN (1 << 11) #define PLL1_PFD3_EN (1 << 10) #define PLL1_PFD2_EN (1 << 9) #define PLL1_PFD1_EN (1 << 8) /* CCM_CCR */ #define FIRC_EN (1 << 16) #define FXOSC_EN (1 << 12) #define FXOSC_RDY (1 << 5) /* CCM_CSCDR1 */ #define ENET_TS_EN (1 << 23) #define RMII_CLK_EN (1 << 24) #define SAI3_EN (1 << 19) /* CCM_CSCDR2 */ #define ESAI_EN (1 << 30) #define ESDHC1_EN (1 << 29) #define ESDHC0_EN (1 << 28) #define NFC_EN (1 << 9) #define ESDHC1_DIV_S 20 #define ESDHC1_DIV_M 0xf #define ESDHC0_DIV_S 16 #define ESDHC0_DIV_M 0xf /* CCM_CSCDR3 */ #define DCU0_EN (1 << 19) #define QSPI1_EN (1 << 12) #define QSPI1_DIV (1 << 11) #define QSPI1_X2_DIV (1 << 10) #define QSPI1_X4_DIV_M 0x3 #define QSPI1_X4_DIV_S 8 #define QSPI0_EN (1 << 4) #define QSPI0_DIV (1 << 3) #define QSPI0_X2_DIV (1 << 2) #define QSPI0_X4_DIV_M 0x3 #define QSPI0_X4_DIV_S 0 #define SAI3_DIV_SHIFT 12 #define SAI3_DIV_MASK 0xf #define ESAI_DIV_SHIFT 24 #define ESAI_DIV_MASK 0xf #define PLL4_CLK_DIV_SHIFT 6 #define PLL4_CLK_DIV_MASK 0x7 #define IPG_CLK_DIV_SHIFT 11 #define IPG_CLK_DIV_MASK 0x3 #define ESAI_CLK_SEL_SHIFT 20 #define ESAI_CLK_SEL_MASK 0x3 #define SAI3_CLK_SEL_SHIFT 6 #define SAI3_CLK_SEL_MASK 0x3 #define CKO1_EN (1 << 10) #define CKO1_DIV_MASK 0xf #define CKO1_DIV_SHIFT 6 #define CKO1_SEL_MASK 0x3f #define CKO1_SEL_SHIFT 0 #define CKO1_PLL4_MAIN 0x6 #define CKO1_PLL4_DIVD 0x7 struct clk { uint32_t reg; uint32_t enable_reg; uint32_t div_mask; uint32_t div_shift; uint32_t div_val; uint32_t sel_reg; uint32_t sel_mask; uint32_t sel_shift; uint32_t sel_val; }; static struct clk ipg_clk = { .reg = CCM_CACRR, .enable_reg = 0, .div_mask = IPG_CLK_DIV_MASK, .div_shift = IPG_CLK_DIV_SHIFT, .div_val = 1, /* Divide by 2 */ .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; /* PLL4 clock divider (before switching the clocks should be gated) 000 Divide by 1 (only if PLL frequency less than or equal to 650 MHz) 001 Divide by 4 010 Divide by 6 011 Divide by 8 100 Divide by 10 101 Divide by 12 110 Divide by 14 111 Divide by 16 */ static struct clk pll4_clk = { .reg = CCM_CACRR, .enable_reg = 0, .div_mask = PLL4_CLK_DIV_MASK, .div_shift = PLL4_CLK_DIV_SHIFT, .div_val = 5, /* Divide by 12 */ .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk sai3_clk = { .reg = CCM_CSCDR1, .enable_reg = SAI3_EN, .div_mask = SAI3_DIV_MASK, .div_shift = SAI3_DIV_SHIFT, .div_val = 1, .sel_reg = CCM_CSCMR1, .sel_mask = SAI3_CLK_SEL_MASK, .sel_shift = SAI3_CLK_SEL_SHIFT, .sel_val = 0x3, /* Divided PLL4 main clock */ }; static struct clk cko1_clk = { .reg = CCM_CCOSR, .enable_reg = CKO1_EN, .div_mask = CKO1_DIV_MASK, .div_shift = CKO1_DIV_SHIFT, .div_val = 1, .sel_reg = CCM_CCOSR, .sel_mask = CKO1_SEL_MASK, .sel_shift = CKO1_SEL_SHIFT, .sel_val = CKO1_PLL4_DIVD, }; static struct clk esdhc0_clk = { .reg = CCM_CSCDR2, .enable_reg = ESDHC0_EN, .div_mask = ESDHC0_DIV_M, .div_shift = ESDHC0_DIV_S, .div_val = 0x9, .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk esdhc1_clk = { .reg = CCM_CSCDR2, .enable_reg = ESDHC1_EN, .div_mask = ESDHC1_DIV_M, .div_shift = ESDHC1_DIV_S, .div_val = 0x9, .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk qspi0_clk = { .reg = CCM_CSCDR3, .enable_reg = QSPI0_EN, .div_mask = 0, .div_shift = 0, .div_val = 0, .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk dcu0_clk = { .reg = CCM_CSCDR3, .enable_reg = DCU0_EN, .div_mask = 0x7, .div_shift = 16, /* DCU0_DIV */ .div_val = 0, /* divide by 1 */ .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk enet_clk = { .reg = CCM_CSCDR1, .enable_reg = (ENET_TS_EN | RMII_CLK_EN), .div_mask = 0, .div_shift = 0, .div_val = 0, .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; static struct clk nand_clk = { .reg = CCM_CSCDR2, .enable_reg = NFC_EN, .div_mask = 0, .div_shift = 0, .div_val = 0, .sel_reg = 0, .sel_mask = 0, .sel_shift = 0, .sel_val = 0, }; /* Divider to generate ESAI clock 0000 Divide by 1 0001 Divide by 2 ... ... 1111 Divide by 16 */ static struct clk esai_clk = { .reg = CCM_CSCDR2, .enable_reg = ESAI_EN, .div_mask = ESAI_DIV_MASK, .div_shift = ESAI_DIV_SHIFT, .div_val = 3, /* Divide by 4 */ .sel_reg = CCM_CSCMR1, .sel_mask = ESAI_CLK_SEL_MASK, .sel_shift = ESAI_CLK_SEL_SHIFT, .sel_val = 0x3, /* Divided PLL4 main clock */ }; struct clock_entry { char *name; struct clk *clk; }; static struct clock_entry clock_map[] = { {"ipg", &ipg_clk}, {"pll4", &pll4_clk}, {"sai3", &sai3_clk}, {"cko1", &cko1_clk}, {"esdhc0", &esdhc0_clk}, {"esdhc1", &esdhc1_clk}, {"qspi0", &qspi0_clk}, {"dcu0", &dcu0_clk}, {"enet", &enet_clk}, {"nand", &nand_clk}, {"esai", &esai_clk}, {NULL, NULL} }; struct ccm_softc { struct resource *res[1]; bus_space_tag_t bst; bus_space_handle_t bsh; device_t dev; }; static struct resource_spec ccm_spec[] = { { SYS_RES_MEMORY, 0, RF_ACTIVE }, { -1, 0 } }; static int ccm_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (!ofw_bus_is_compatible(dev, "fsl,mvf600-ccm")) return (ENXIO); device_set_desc(dev, "Vybrid Family CCM Unit"); return (BUS_PROBE_DEFAULT); } static int set_clock(struct ccm_softc *sc, char *name) { struct clk *clk; int reg; int i; for (i = 0; clock_map[i].name != NULL; i++) { if (strcmp(clock_map[i].name, name) == 0) { #if 0 device_printf(sc->dev, "Configuring %s clk\n", name); #endif clk = clock_map[i].clk; if (clk->sel_reg != 0) { reg = READ4(sc, clk->sel_reg); reg &= ~(clk->sel_mask << clk->sel_shift); reg |= (clk->sel_val << clk->sel_shift); WRITE4(sc, clk->sel_reg, reg); } reg = READ4(sc, clk->reg); reg |= clk->enable_reg; reg &= ~(clk->div_mask << clk->div_shift); reg |= (clk->div_val << clk->div_shift); WRITE4(sc, clk->reg, reg); } } return (0); } static int ccm_fdt_set(struct ccm_softc *sc) { phandle_t child, parent, root; int len; char *fdt_config, *name; root = OF_finddevice("/"); len = 0; parent = root; /* Find 'clock_names' prop in the tree */ for (child = OF_child(parent); child != 0; child = OF_peer(child)) { /* Find a 'leaf'. Start the search from this node. */ while (OF_child(child)) { parent = child; child = OF_child(child); } if (!ofw_bus_node_status_okay(child)) continue; if ((len = OF_getproplen(child, "clock_names")) > 0) { len = OF_getproplen(child, "clock_names"); OF_getprop_alloc(child, "clock_names", (void **)&fdt_config); while (len > 0) { name = fdt_config; fdt_config += strlen(name) + 1; len -= strlen(name) + 1; set_clock(sc, name); } } if (OF_peer(child) == 0) { /* No more siblings. */ child = parent; parent = OF_parent(child); } } return (0); } static int ccm_attach(device_t dev) { struct ccm_softc *sc; int reg; int i; sc = device_get_softc(dev); sc->dev = dev; if (bus_alloc_resources(dev, ccm_spec, sc->res)) { device_printf(dev, "could not allocate resources\n"); return (ENXIO); } /* Memory interface */ sc->bst = rman_get_bustag(sc->res[0]); sc->bsh = rman_get_bushandle(sc->res[0]); /* Enable oscillator */ reg = READ4(sc, CCM_CCR); reg |= (FIRC_EN | FXOSC_EN); WRITE4(sc, CCM_CCR, reg); /* Wait 10 times */ for (i = 0; i < 10; i++) { if (READ4(sc, CCM_CSR) & FXOSC_RDY) { device_printf(sc->dev, "On board oscillator is ready.\n"); break; } cpufunc_nullop(); } /* Clock is on during all modes, except stop mode. */ for (i = 0; i < CCM_CCGRN; i++) { WRITE4(sc, CCM_CCGR(i), 0xffffffff); } /* Take and apply FDT clocks */ ccm_fdt_set(sc); return (0); } static device_method_t ccm_methods[] = { DEVMETHOD(device_probe, ccm_probe), DEVMETHOD(device_attach, ccm_attach), { 0, 0 } }; static driver_t ccm_driver = { "ccm", ccm_methods, sizeof(struct ccm_softc), }; static devclass_t ccm_devclass; DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0);