1bcc181b0SPeter Chubb /* 2bcc181b0SPeter Chubb * IMX31 Clock Control Module 3bcc181b0SPeter Chubb * 4bcc181b0SPeter Chubb * Copyright (C) 2012 NICTA 5282e74c8SJean-Christophe Dubois * Updated by Jean-Christophe Dubois <jcd@tribudubois.net> 6bcc181b0SPeter Chubb * 7bcc181b0SPeter Chubb * This work is licensed under the terms of the GNU GPL, version 2 or later. 8bcc181b0SPeter Chubb * See the COPYING file in the top-level directory. 9bcc181b0SPeter Chubb * 10cb54d868SJean-Christophe Dubois * This is an abstract base class used to get a common interface to 11cb54d868SJean-Christophe Dubois * retrieve the CCM frequencies from the various i.MX SOC. 12bcc181b0SPeter Chubb */ 13bcc181b0SPeter Chubb 148ef94f0bSPeter Maydell #include "qemu/osdep.h" 15282e74c8SJean-Christophe Dubois #include "hw/misc/imx_ccm.h" 1603dd024fSPaolo Bonzini #include "qemu/log.h" 170b8fa32fSMarkus Armbruster #include "qemu/module.h" 18bcc181b0SPeter Chubb 194a6aa0afSJean-Christophe Dubois #ifndef DEBUG_IMX_CCM 204a6aa0afSJean-Christophe Dubois #define DEBUG_IMX_CCM 0 21bcc181b0SPeter Chubb #endif 22bcc181b0SPeter Chubb 234a6aa0afSJean-Christophe Dubois #define DPRINTF(fmt, args...) \ 244a6aa0afSJean-Christophe Dubois do { \ 254a6aa0afSJean-Christophe Dubois if (DEBUG_IMX_CCM) { \ 264a6aa0afSJean-Christophe Dubois fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_CCM, \ 274a6aa0afSJean-Christophe Dubois __func__, ##args); \ 284a6aa0afSJean-Christophe Dubois } \ 294a6aa0afSJean-Christophe Dubois } while (0) 304a6aa0afSJean-Christophe Dubois 31bcc181b0SPeter Chubb 32cb54d868SJean-Christophe Dubois uint32_t imx_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock) 33bcc181b0SPeter Chubb { 34cb54d868SJean-Christophe Dubois uint32_t freq = 0; 35fed163c9SEduardo Habkost IMXCCMClass *klass = IMX_CCM_GET_CLASS(dev); 36bcc181b0SPeter Chubb 37cb54d868SJean-Christophe Dubois if (klass->get_clock_frequency) { 38cb54d868SJean-Christophe Dubois freq = klass->get_clock_frequency(dev, clock); 39bcc181b0SPeter Chubb } 40cb54d868SJean-Christophe Dubois 41*a88ae037SAlex Chen DPRINTF("(clock = %d) = %u\n", clock, freq); 42cb54d868SJean-Christophe Dubois 43cb54d868SJean-Christophe Dubois return freq; 44bcc181b0SPeter Chubb } 45bcc181b0SPeter Chubb 46bcc181b0SPeter Chubb /* 47bcc181b0SPeter Chubb * Calculate PLL output frequency 48bcc181b0SPeter Chubb */ 49cb54d868SJean-Christophe Dubois uint32_t imx_ccm_calc_pll(uint32_t pllreg, uint32_t base_freq) 50bcc181b0SPeter Chubb { 51cb54d868SJean-Christophe Dubois int32_t freq; 52bcc181b0SPeter Chubb int32_t mfn = MFN(pllreg); /* Numerator */ 53bcc181b0SPeter Chubb uint32_t mfi = MFI(pllreg); /* Integer part */ 54bcc181b0SPeter Chubb uint32_t mfd = 1 + MFD(pllreg); /* Denominator */ 55bcc181b0SPeter Chubb uint32_t pd = 1 + PD(pllreg); /* Pre-divider */ 56bcc181b0SPeter Chubb 57bcc181b0SPeter Chubb if (mfi < 5) { 58bcc181b0SPeter Chubb mfi = 5; 59bcc181b0SPeter Chubb } 60cb54d868SJean-Christophe Dubois 61bcc181b0SPeter Chubb /* mfn is 10-bit signed twos-complement */ 62bcc181b0SPeter Chubb mfn <<= 32 - 10; 63bcc181b0SPeter Chubb mfn >>= 32 - 10; 64bcc181b0SPeter Chubb 65cb54d868SJean-Christophe Dubois freq = ((2 * (base_freq >> 10) * (mfi * mfd + mfn)) / 66bcc181b0SPeter Chubb (mfd * pd)) << 10; 67bcc181b0SPeter Chubb 68*a88ae037SAlex Chen DPRINTF("(pllreg = 0x%08x, base_freq = %u) = %d\n", pllreg, base_freq, 69cb54d868SJean-Christophe Dubois freq); 70bcc181b0SPeter Chubb 71cb54d868SJean-Christophe Dubois return freq; 72bcc181b0SPeter Chubb } 73bcc181b0SPeter Chubb 748c43a6f0SAndreas Färber static const TypeInfo imx_ccm_info = { 75bcb34c7aSAndreas Färber .name = TYPE_IMX_CCM, 76bcc181b0SPeter Chubb .parent = TYPE_SYS_BUS_DEVICE, 77bcc181b0SPeter Chubb .instance_size = sizeof(IMXCCMState), 78cb54d868SJean-Christophe Dubois .class_size = sizeof(IMXCCMClass), 79cb54d868SJean-Christophe Dubois .abstract = true, 80bcc181b0SPeter Chubb }; 81bcc181b0SPeter Chubb 82bcc181b0SPeter Chubb static void imx_ccm_register_types(void) 83bcc181b0SPeter Chubb { 84bcc181b0SPeter Chubb type_register_static(&imx_ccm_info); 85bcc181b0SPeter Chubb } 86bcc181b0SPeter Chubb 87bcc181b0SPeter Chubb type_init(imx_ccm_register_types) 88