arch/arm/mach-mx25/clock.c

   1 /*
   2  * Copyright (C) 2009 by Sascha Hauer, Pengutronix
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  16  * MA 02110-1301, USA.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/clk.h>
  23 #include <linux/io.h>
  24
  25 #include <asm/clkdev.h>
  26
  27 #include <mach/clock.h>
  28 #include <mach/hardware.h>
  29 #include <mach/common.h>
  30 #include <mach/mx25.h>
  31
  32 #define CRM_BASE        MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR)
  33
  34 #define CCM_MPCTL       0x00
  35 #define CCM_UPCTL       0x04
  36 #define CCM_CCTL        0x08
  37 #define CCM_CGCR0       0x0C
  38 #define CCM_CGCR1       0x10
  39 #define CCM_CGCR2       0x14
  40 #define CCM_PCDR0       0x18
  41 #define CCM_PCDR1       0x1C
  42 #define CCM_PCDR2       0x20
  43 #define CCM_PCDR3       0x24
  44 #define CCM_RCSR        0x28
  45 #define CCM_CRDR        0x2C
  46 #define CCM_DCVR0       0x30
  47 #define CCM_DCVR1       0x34
  48 #define CCM_DCVR2       0x38
  49 #define CCM_DCVR3       0x3c
  50 #define CCM_LTR0        0x40
  51 #define CCM_LTR1        0x44
  52 #define CCM_LTR2        0x48
  53 #define CCM_LTR3        0x4c
  54
  55 static unsigned long get_rate_mpll(void)
  56 {
  57         ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL);
  58
  59         return mxc_decode_pll(mpctl, 24000000);
  60 }
  61
  62 static unsigned long get_rate_upll(void)
  63 {
  64         ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL);
  65
  66         return mxc_decode_pll(mpctl, 24000000);
  67 }
  68
  69 unsigned long get_rate_arm(struct clk *clk)
  70 {
  71         unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
  72         unsigned long rate = get_rate_mpll();
  73
  74         if (cctl & (1 << 14))
  75                 rate = (rate * 3) >> 1;
  76
  77         return rate / ((cctl >> 30) + 1);
  78 }
  79
  80 static unsigned long get_rate_ahb(struct clk *clk)
  81 {
  82         unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
  83
  84         return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1);
  85 }
  86
  87 static unsigned long get_rate_ipg(struct clk *clk)
  88 {
  89         return get_rate_ahb(NULL) >> 1;
  90 }
  91
  92 static unsigned long get_rate_per(int per)
  93 {
  94         unsigned long ofs = (per & 0x3) * 8;
  95         unsigned long reg = per & ~0x3;
  96         unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f;
  97         unsigned long fref;
  98
  99         if (readl(CRM_BASE + 0x64) & (1 << per))
 100                 fref = get_rate_upll();
 101         else
 102                 fref = get_rate_ipg(NULL);
 103
 104         return fref / (val + 1);
 105 }
 106
 107 static unsigned long get_rate_uart(struct clk *clk)
 108 {
 109         return get_rate_per(15);
 110 }
 111
 112 static unsigned long get_rate_i2c(struct clk *clk)
 113 {
 114         return get_rate_per(6);
 115 }
 116
 117 static unsigned long get_rate_nfc(struct clk *clk)
 118 {
 119         return get_rate_per(8);
 120 }
 121
 122 static unsigned long get_rate_gpt(struct clk *clk)
 123 {
 124         return get_rate_per(5);
 125 }
 126
 127 static unsigned long get_rate_otg(struct clk *clk)
 128 {
 129         return 48000000; /* FIXME */
 130 }
 131
 132 static int clk_cgcr_enable(struct clk *clk)
 133 {
 134         u32 reg;
 135
 136         reg = __raw_readl(clk->enable_reg);
 137         reg |= 1 << clk->enable_shift;
 138         __raw_writel(reg, clk->enable_reg);
 139
 140         return 0;
 141 }
 142
 143 static void clk_cgcr_disable(struct clk *clk)
 144 {
 145         u32 reg;
 146
 147         reg = __raw_readl(clk->enable_reg);
 148         reg &= ~(1 << clk->enable_shift);
 149         __raw_writel(reg, clk->enable_reg);
 150 }
 151
 152 #define DEFINE_CLOCK(name, i, er, es, gr, sr, s)        \
 153         static struct clk name = {                      \
 154                 .id             = i,                    \
 155                 .enable_reg     = CRM_BASE + er,        \
 156                 .enable_shift   = es,                   \
 157                 .get_rate       = gr,                   \
 158                 .set_rate       = sr,                   \
 159                 .enable         = clk_cgcr_enable,      \
 160                 .disable        = clk_cgcr_disable,     \
 161                 .secondary      = s,                    \
 162         }
 163
 164 DEFINE_CLOCK(gpt_clk,    0, CCM_CGCR0,  5, get_rate_gpt, NULL, NULL);
 165 DEFINE_CLOCK(uart_per_clk, 0, CCM_CGCR0, 15, get_rate_uart, NULL, NULL);
 166 DEFINE_CLOCK(cspi1_clk,  0, CCM_CGCR1,  5, get_rate_ipg, NULL, NULL);
 167 DEFINE_CLOCK(cspi2_clk,  0, CCM_CGCR1,  6, get_rate_ipg, NULL, NULL);
 168 DEFINE_CLOCK(cspi3_clk,  0, CCM_CGCR1,  7, get_rate_ipg, NULL, NULL);
 169 DEFINE_CLOCK(fec_ahb_clk, 0, CCM_CGCR0, 23, NULL,        NULL, NULL);
 170 DEFINE_CLOCK(uart1_clk,  0, CCM_CGCR2, 14, get_rate_uart, NULL, &uart_per_clk);
 171 DEFINE_CLOCK(uart2_clk,  0, CCM_CGCR2, 15, get_rate_uart, NULL, &uart_per_clk);
 172 DEFINE_CLOCK(uart3_clk,  0, CCM_CGCR2, 16, get_rate_uart, NULL, &uart_per_clk);
 173 DEFINE_CLOCK(uart4_clk,  0, CCM_CGCR2, 17, get_rate_uart, NULL, &uart_per_clk);
 174 DEFINE_CLOCK(uart5_clk,  0, CCM_CGCR2, 18, get_rate_uart, NULL, &uart_per_clk);
 175 DEFINE_CLOCK(nfc_clk,    0, CCM_CGCR0,  8, get_rate_nfc, NULL, NULL);
 176 DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL, NULL);
 177 DEFINE_CLOCK(pwm1_clk,   0, CCM_CGCR1, 31, get_rate_ipg, NULL, NULL);
 178 DEFINE_CLOCK(pwm2_clk,   0, CCM_CGCR2,  0, get_rate_ipg, NULL, NULL);
 179 DEFINE_CLOCK(pwm3_clk,   0, CCM_CGCR2,  1, get_rate_ipg, NULL, NULL);
 180 DEFINE_CLOCK(pwm4_clk,   0, CCM_CGCR2,  2, get_rate_ipg, NULL, NULL);
 181 DEFINE_CLOCK(kpp_clk,    0, CCM_CGCR1, 28, get_rate_ipg, NULL, NULL);
 182 DEFINE_CLOCK(tsc_clk,    0, CCM_CGCR2, 13, get_rate_ipg, NULL, NULL);
 183 DEFINE_CLOCK(i2c_clk,    0, CCM_CGCR0,  6, get_rate_i2c, NULL, NULL);
 184 DEFINE_CLOCK(fec_clk,    0, CCM_CGCR1, 15, get_rate_ipg, NULL, &fec_ahb_clk);
 185
 186 #define _REGISTER_CLOCK(d, n, c)        \
 187         {                               \
 188                 .dev_id = d,            \
 189                 .con_id = n,            \
 190                 .clk = &c,              \
 191         },
 192
 193 static struct clk_lookup lookups[] = {
 194         _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
 195         _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
 196         _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
 197         _REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk)
 198         _REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk)
 199         _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
 200         _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
 201         _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
 202         _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
 203         _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
 204         _REGISTER_CLOCK("spi_imx.0", NULL, cspi1_clk)
 205         _REGISTER_CLOCK("spi_imx.1", NULL, cspi2_clk)
 206         _REGISTER_CLOCK("spi_imx.2", NULL, cspi3_clk)
 207         _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk)
 208         _REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk)
 209         _REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk)
 210         _REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk)
 211         _REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk)
 212         _REGISTER_CLOCK("mx25-adc", NULL, tsc_clk)
 213         _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
 214         _REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk)
 215         _REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk)
 216         _REGISTER_CLOCK("fec.0", NULL, fec_clk)
 217 };
 218
 219 int __init mx25_clocks_init(void)
 220 {
 221         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 222
 223         /* Turn off all clocks except the ones we need to survive, namely:
 224          * EMI, GPIO1-3 (CCM_CGCR1[18:16]), GPT1, IOMUXC (CCM_CGCR1[27]), IIM,
 225          * SCC
 226          */
 227         __raw_writel((1 << 19), CRM_BASE + CCM_CGCR0);
 228         __raw_writel((0xf << 16) | (3 << 26), CRM_BASE + CCM_CGCR1);
 229         __raw_writel((1 << 5), CRM_BASE + CCM_CGCR2);
 230
 231         mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54);
 232
 233         return 0;
 234 }