2 * (C) Copyright 2009 DENX Software Engineering
3 * Author: John Rigby <jrigby@gmail.com>
5 * Based on mx27/generic.c:
6 * Copyright (c) 2008 Eric Jarrige <eric.jarrige@armadeus.org>
7 * Copyright (c) 2009 Ilya Yanok <yanok@emcraft.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/arch/imx-regs.h>
30 #include <asm/arch/imx25-pinmux.h>
32 #include <asm/arch/mxcmmc.h>
36 * get the system pll clock in Hz
38 * mfi + mfn / (mfd +1)
39 * f = 2 * f_ref * --------------------
42 static unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
44 unsigned int mfi = (pll >> CCM_PLL_MFI_SHIFT)
46 unsigned int mfn = (pll >> CCM_PLL_MFN_SHIFT)
48 unsigned int mfd = (pll >> CCM_PLL_MFD_SHIFT)
50 unsigned int pd = (pll >> CCM_PLL_PD_SHIFT)
53 mfi = mfi <= 5 ? 5 : mfi;
55 return lldiv(2 * (u64) f_ref * (mfi * (mfd + 1) + mfn),
56 (mfd + 1) * (pd + 1));
59 static ulong imx_get_mpllclk(void)
61 struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
62 ulong fref = 24000000;
64 return imx_decode_pll(readl(&ccm->mpctl), fref);
67 ulong imx_get_armclk(void)
69 struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
70 ulong cctl = readl(&ccm->cctl);
71 ulong fref = imx_get_mpllclk();
74 if (cctl & CCM_CCTL_ARM_SRC)
75 fref = lldiv((fref * 3), 4);
77 div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
78 & CCM_CCTL_ARM_DIV_MASK) + 1;
80 return lldiv(fref, div);
83 ulong imx_get_ahbclk(void)
85 struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
86 ulong cctl = readl(&ccm->cctl);
87 ulong fref = imx_get_armclk();
90 div = ((cctl >> CCM_CCTL_AHB_DIV_SHIFT)
91 & CCM_CCTL_AHB_DIV_MASK) + 1;
93 return lldiv(fref, div);
96 ulong imx_get_perclk(int clk)
98 struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
99 ulong fref = imx_get_ahbclk();
102 div = readl(&ccm->pcdr[CCM_PERCLK_REG(clk)]);
103 div = ((div >> CCM_PERCLK_SHIFT(clk)) & CCM_PERCLK_MASK) + 1;
105 return lldiv(fref, div);
108 u32 get_cpu_rev(void)
111 u32 system_rev = 0x25000;
113 /* read SREV register from IIM module */
114 struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
115 srev = readl(&iim->iim_srev);
119 system_rev |= CHIP_REV_1_0;
122 system_rev |= CHIP_REV_1_1;
125 system_rev |= 0x8000;
132 #if defined(CONFIG_DISPLAY_CPUINFO)
133 static char *get_reset_cause(void)
135 /* read RCSR register from CCM module */
136 struct ccm_regs *ccm =
137 (struct ccm_regs *)IMX_CCM_BASE;
139 u32 cause = readl(&ccm->rcsr) & 0x0f;
145 else if ((cause & 2) == 2)
147 else if ((cause & 4) == 4)
149 else if ((cause & 8) == 8)
152 return "unknown reset";
156 int print_cpuinfo(void)
159 u32 cpurev = get_cpu_rev();
161 printf("CPU: Freescale i.MX25 rev%d.%d%s at %s MHz\n",
162 (cpurev & 0xF0) >> 4, (cpurev & 0x0F),
163 ((cpurev & 0x8000) ? " unknown" : ""),
164 strmhz(buf, imx_get_armclk()));
165 printf("Reset cause: %s\n\n", get_reset_cause());
170 int cpu_eth_init(bd_t *bis)
172 #if defined(CONFIG_FEC_MXC)
173 struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
176 val = readl(&ccm->cgr0);
178 writel(val, &ccm->cgr0);
179 return fecmxc_initialize(bis);
186 * Initializes on-chip MMC controllers.
187 * to override, implement board_mmc_init()
189 int cpu_mmc_init(bd_t *bis)
191 #ifdef CONFIG_MXC_MMC
192 return mxc_mmc_init(bis);
198 #ifdef CONFIG_MXC_UART
199 void mx25_uart1_init_pins(void)
201 struct iomuxc_mux_ctl *muxctl;
202 struct iomuxc_pad_ctl *padctl;
207 muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
208 padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
209 muxmode0 = MX25_PIN_MUX_MODE(0);
211 * set up input pins with hysteresis and 100K pull-ups
213 inpadctl = MX25_PIN_PAD_CTL_HYS
214 | MX25_PIN_PAD_CTL_PKE
215 | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PU;
218 * set up output pins with 100K pull-downs
219 * FIXME: need to revisit this
220 * PUE is ignored if PKE is not set
221 * so the right value here is likely
222 * 0x0 for no pull up/down
224 * 0xc0 for 100k pull down
226 outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
230 writel(muxmode0, &muxctl->pad_uart1_rxd);
231 writel(inpadctl, &padctl->pad_uart1_rxd);
234 writel(muxmode0, &muxctl->pad_uart1_txd);
235 writel(outpadctl, &padctl->pad_uart1_txd);
238 writel(muxmode0, &muxctl->pad_uart1_rts);
239 writel(outpadctl, &padctl->pad_uart1_rts);
242 writel(muxmode0, &muxctl->pad_uart1_cts);
243 writel(inpadctl, &padctl->pad_uart1_cts);
245 #endif /* CONFIG_MXC_UART */
247 #ifdef CONFIG_FEC_MXC
248 void mx25_fec_init_pins(void)
250 struct iomuxc_mux_ctl *muxctl;
251 struct iomuxc_pad_ctl *padctl;
257 muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
258 padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
259 muxmode0 = MX25_PIN_MUX_MODE(0);
260 inpadctl_100kpd = MX25_PIN_PAD_CTL_HYS
261 | MX25_PIN_PAD_CTL_PKE
262 | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
263 inpadctl_22kpu = MX25_PIN_PAD_CTL_HYS
264 | MX25_PIN_PAD_CTL_PKE
265 | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_22K_PU;
267 * set up output pins with 100K pull-downs
268 * FIXME: need to revisit this
269 * PUE is ignored if PKE is not set
270 * so the right value here is likely
273 * 0xc0 for 100k pull down
275 outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
278 writel(muxmode0, &muxctl->pad_fec_tx_clk);
279 writel(inpadctl_100kpd, &padctl->pad_fec_tx_clk);
282 writel(muxmode0, &muxctl->pad_fec_rx_dv);
283 writel(inpadctl_100kpd, &padctl->pad_fec_rx_dv);
286 writel(muxmode0, &muxctl->pad_fec_rdata0);
287 writel(inpadctl_100kpd, &padctl->pad_fec_rdata0);
290 writel(muxmode0, &muxctl->pad_fec_tdata0);
291 writel(outpadctl, &padctl->pad_fec_tdata0);
294 writel(muxmode0, &muxctl->pad_fec_tx_en);
295 writel(outpadctl, &padctl->pad_fec_tx_en);
298 writel(muxmode0, &muxctl->pad_fec_mdc);
299 writel(outpadctl, &padctl->pad_fec_mdc);
302 writel(muxmode0, &muxctl->pad_fec_mdio);
303 writel(inpadctl_22kpu, &padctl->pad_fec_mdio);
306 writel(muxmode0, &muxctl->pad_fec_rdata1);
307 writel(inpadctl_100kpd, &padctl->pad_fec_rdata1);
310 writel(muxmode0, &muxctl->pad_fec_tdata1);
311 writel(outpadctl, &padctl->pad_fec_tdata1);
315 void imx_get_mac_from_fuse(unsigned char *mac)
318 struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
319 struct fuse_bank *bank = &iim->bank[0];
320 struct fuse_bank0_regs *fuse =
321 (struct fuse_bank0_regs *)bank->fuse_regs;
323 for (i = 0; i < 6; i++)
324 mac[i] = readl(&fuse->mac_addr[i]) & 0xff;
326 #endif /* CONFIG_FEC_MXC */