1 /* 2 * linux/arch/arm/mach-pxa/pxa3xx.c 3 * 4 * code specific to pxa3xx aka Monahans 5 * 6 * Copyright (C) 2006 Marvell International Ltd. 7 * 8 * 2007-09-02: eric miao <eric.miao@marvell.com> 9 * initial version 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/init.h> 19 #include <linux/pm.h> 20 #include <linux/platform_device.h> 21 #include <linux/irq.h> 22 23 #include <asm/hardware.h> 24 #include <asm/arch/pxa3xx-regs.h> 25 #include <asm/arch/ohci.h> 26 #include <asm/arch/pm.h> 27 #include <asm/arch/dma.h> 28 #include <asm/arch/ssp.h> 29 30 #include "generic.h" 31 #include "devices.h" 32 #include "clock.h" 33 34 /* Crystal clock: 13MHz */ 35 #define BASE_CLK 13000000 36 37 /* Ring Oscillator Clock: 60MHz */ 38 #define RO_CLK 60000000 39 40 #define ACCR_D0CS (1 << 26) 41 42 /* crystal frequency to static memory controller multiplier (SMCFS) */ 43 static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, }; 44 45 /* crystal frequency to HSIO bus frequency multiplier (HSS) */ 46 static unsigned char hss_mult[4] = { 8, 12, 16, 0 }; 47 48 /* 49 * Get the clock frequency as reflected by CCSR and the turbo flag. 50 * We assume these values have been applied via a fcs. 51 * If info is not 0 we also display the current settings. 52 */ 53 unsigned int pxa3xx_get_clk_frequency_khz(int info) 54 { 55 unsigned long acsr, xclkcfg; 56 unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS; 57 58 /* Read XCLKCFG register turbo bit */ 59 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); 60 t = xclkcfg & 0x1; 61 62 acsr = ACSR; 63 64 xl = acsr & 0x1f; 65 xn = (acsr >> 8) & 0x7; 66 hss = (acsr >> 14) & 0x3; 67 68 XL = xl * BASE_CLK; 69 XN = xn * XL; 70 71 ro = acsr & ACCR_D0CS; 72 73 CLK = (ro) ? RO_CLK : ((t) ? XN : XL); 74 HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK; 75 76 if (info) { 77 pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n", 78 RO_CLK / 1000000, (RO_CLK % 1000000) / 10000, 79 (ro) ? "" : "in"); 80 pr_info("Run Mode clock: %d.%02dMHz (*%d)\n", 81 XL / 1000000, (XL % 1000000) / 10000, xl); 82 pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n", 83 XN / 1000000, (XN % 1000000) / 10000, xn, 84 (t) ? "" : "in"); 85 pr_info("HSIO bus clock: %d.%02dMHz\n", 86 HSS / 1000000, (HSS % 1000000) / 10000); 87 } 88 89 return CLK; 90 } 91 92 /* 93 * Return the current static memory controller clock frequency 94 * in units of 10kHz 95 */ 96 unsigned int pxa3xx_get_memclk_frequency_10khz(void) 97 { 98 unsigned long acsr; 99 unsigned int smcfs, clk = 0; 100 101 acsr = ACSR; 102 103 smcfs = (acsr >> 23) & 0x7; 104 clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK; 105 106 return (clk / 10000); 107 } 108 109 /* 110 * Return the current HSIO bus clock frequency 111 */ 112 static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk) 113 { 114 unsigned long acsr; 115 unsigned int hss, hsio_clk; 116 117 acsr = ACSR; 118 119 hss = (acsr >> 14) & 0x3; 120 hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK; 121 122 return hsio_clk; 123 } 124 125 static void clk_pxa3xx_cken_enable(struct clk *clk) 126 { 127 unsigned long mask = 1ul << (clk->cken & 0x1f); 128 129 local_irq_disable(); 130 131 if (clk->cken < 32) 132 CKENA |= mask; 133 else 134 CKENB |= mask; 135 136 local_irq_enable(); 137 } 138 139 static void clk_pxa3xx_cken_disable(struct clk *clk) 140 { 141 unsigned long mask = 1ul << (clk->cken & 0x1f); 142 143 local_irq_disable(); 144 145 if (clk->cken < 32) 146 CKENA &= ~mask; 147 else 148 CKENB &= ~mask; 149 150 local_irq_enable(); 151 } 152 153 static const struct clkops clk_pxa3xx_hsio_ops = { 154 .enable = clk_pxa3xx_cken_enable, 155 .disable = clk_pxa3xx_cken_disable, 156 .getrate = clk_pxa3xx_hsio_getrate, 157 }; 158 159 static struct clk pxa3xx_clks[] = { 160 INIT_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev), 161 INIT_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL), 162 163 INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev), 164 INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev), 165 INIT_CKEN("UARTCLK", STUART, 14857000, 1, NULL), 166 167 INIT_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev), 168 INIT_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev), 169 }; 170 171 void __init pxa3xx_init_irq(void) 172 { 173 /* enable CP6 access */ 174 u32 value; 175 __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value)); 176 value |= (1 << 6); 177 __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value)); 178 179 pxa_init_irq_low(); 180 pxa_init_irq_high(); 181 pxa_init_irq_gpio(128); 182 } 183 184 /* 185 * device registration specific to PXA3xx. 186 */ 187 188 static struct platform_device *devices[] __initdata = { 189 &pxa_device_mci, 190 &pxa_device_udc, 191 &pxa_device_fb, 192 &pxa_device_ffuart, 193 &pxa_device_btuart, 194 &pxa_device_stuart, 195 &pxa_device_i2c, 196 &pxa_device_i2s, 197 &pxa_device_ficp, 198 &pxa_device_rtc, 199 }; 200 201 static int __init pxa3xx_init(void) 202 { 203 int ret = 0; 204 205 if (cpu_is_pxa3xx()) { 206 clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks)); 207 208 if ((ret = pxa_init_dma(32))) 209 return ret; 210 211 return platform_add_devices(devices, ARRAY_SIZE(devices)); 212 } 213 return 0; 214 } 215 216 subsys_initcall(pxa3xx_init); 217