2 * (C) Copyright 2010-2011
3 * NVIDIA Corporation <www.nvidia.com>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/arch/tegra2.h>
26 #include <asm/arch/ap20.h>
27 #include <asm/arch/clk_rst.h>
28 #include <asm/arch/clock.h>
29 #include <asm/arch/fuse.h>
30 #include <asm/arch/gp_padctrl.h>
31 #include <asm/arch/pmc.h>
32 #include <asm/arch/pinmux.h>
33 #include <asm/arch/scu.h>
34 #include <asm/arch/warmboot.h>
37 int tegra_get_chip_type(void)
39 struct apb_misc_gp_ctlr *gp;
40 struct fuse_regs *fuse = (struct fuse_regs *)TEGRA2_FUSE_BASE;
41 uint tegra_sku_id, rev;
44 * This is undocumented, Chip ID is bits 15:8 of the register
45 * APB_MISC + 0x804, and has value 0x20 for Tegra20, 0x30 for
48 gp = (struct apb_misc_gp_ctlr *)TEGRA2_APB_MISC_GP_BASE;
49 rev = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK) >> HIDREV_CHIPID_SHIFT;
51 tegra_sku_id = readl(&fuse->sku_info) & 0xff;
55 switch (tegra_sku_id) {
68 return TEGRA_SOC_UNKNOWN;
71 /* Returns 1 if the current CPU executing is a Cortex-A9, else 0 */
72 static int ap20_cpu_is_cortexa9(void)
74 u32 id = readb(NV_PA_PG_UP_BASE + PG_UP_TAG_0);
75 return id == (PG_UP_TAG_0_PID_CPU & 0xff);
80 struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
81 struct clk_pll *pll = &clkrst->crc_pll[CLOCK_ID_XCPU];
84 /* If PLLX is already enabled, just return */
85 if (readl(&pll->pll_base) & PLL_ENABLE_MASK)
89 writel(1 << PLL_CPCON_SHIFT, &pll->pll_misc);
91 /* Use 12MHz clock here */
92 reg = PLL_BYPASS_MASK | (12 << PLL_DIVM_SHIFT);
93 reg |= 1000 << PLL_DIVN_SHIFT;
94 writel(reg, &pll->pll_base);
96 reg |= PLL_ENABLE_MASK;
97 writel(reg, &pll->pll_base);
99 reg &= ~PLL_BYPASS_MASK;
100 writel(reg, &pll->pll_base);
103 static void enable_cpu_clock(int enable)
105 struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
110 * Regardless of whether the request is to enable or disable the CPU
111 * clock, every processor in the CPU complex except the master (CPU 0)
112 * will have it's clock stopped because the AVP only talks to the
113 * master. The AVP does not know (nor does it need to know) that there
114 * are multiple processors in the CPU complex.
118 /* Initialize PLLX */
121 /* Wait until all clocks are stable */
122 udelay(PLL_STABILIZATION_DELAY);
124 writel(CCLK_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
125 writel(SUPER_CCLK_DIVIDER, &clkrst->crc_super_cclk_div);
129 * Read the register containing the individual CPU clock enables and
130 * always stop the clock to CPU 1.
132 clk = readl(&clkrst->crc_clk_cpu_cmplx);
133 clk |= 1 << CPU1_CLK_STP_SHIFT;
135 /* Stop/Unstop the CPU clock */
136 clk &= ~CPU0_CLK_STP_MASK;
137 clk |= !enable << CPU0_CLK_STP_SHIFT;
138 writel(clk, &clkrst->crc_clk_cpu_cmplx);
140 clock_enable(PERIPH_ID_CPU);
143 static int is_cpu_powered(void)
145 struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
147 return (readl(&pmc->pmc_pwrgate_status) & CPU_PWRED) ? 1 : 0;
150 static void remove_cpu_io_clamps(void)
152 struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
155 /* Remove the clamps on the CPU I/O signals */
156 reg = readl(&pmc->pmc_remove_clamping);
158 writel(reg, &pmc->pmc_remove_clamping);
160 /* Give I/O signals time to stabilize */
161 udelay(IO_STABILIZATION_DELAY);
164 static void powerup_cpu(void)
166 struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
168 int timeout = IO_STABILIZATION_DELAY;
170 if (!is_cpu_powered()) {
171 /* Toggle the CPU power state (OFF -> ON) */
172 reg = readl(&pmc->pmc_pwrgate_toggle);
175 writel(reg, &pmc->pmc_pwrgate_toggle);
177 /* Wait for the power to come up */
178 while (!is_cpu_powered()) {
180 printf("CPU failed to power up!\n");
186 * Remove the I/O clamps from CPU power partition.
187 * Recommended only on a Warm boot, if the CPU partition gets
188 * power gated. Shouldn't cause any harm when called after a
189 * cold boot according to HW, probably just redundant.
191 remove_cpu_io_clamps();
195 static void enable_cpu_power_rail(void)
197 struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
200 reg = readl(&pmc->pmc_cntrl);
202 writel(reg, &pmc->pmc_cntrl);
205 * The TI PMU65861C needs a 3.75ms delay between enabling
206 * the power rail and enabling the CPU clock. This delay
207 * between SM1EN and SM1 is for switching time + the ramp
208 * up of the voltage to the CPU (VDD_CPU from PMU).
213 static void reset_A9_cpu(int reset)
216 * NOTE: Regardless of whether the request is to hold the CPU in reset
217 * or take it out of reset, every processor in the CPU complex
218 * except the master (CPU 0) will be held in reset because the
219 * AVP only talks to the master. The AVP does not know that there
220 * are multiple processors in the CPU complex.
223 /* Hold CPU 1 in reset, and CPU 0 if asked */
224 reset_cmplx_set_enable(1, crc_rst_cpu | crc_rst_de | crc_rst_debug, 1);
225 reset_cmplx_set_enable(0, crc_rst_cpu | crc_rst_de | crc_rst_debug,
228 /* Enable/Disable master CPU reset */
229 reset_set_enable(PERIPH_ID_CPU, reset);
232 static void clock_enable_coresight(int enable)
236 clock_set_enable(PERIPH_ID_CORESIGHT, enable);
237 reset_set_enable(PERIPH_ID_CORESIGHT, !enable);
241 * Put CoreSight on PLLP_OUT0 (216 MHz) and divide it down by
242 * 1.5, giving an effective frequency of 144MHz.
243 * Set PLLP_OUT0 [bits31:30 = 00], and use a 7.1 divisor
244 * (bits 7:0), so 00000001b == 1.5 (n+1 + .5)
246 src = CLK_DIVIDER(NVBL_PLLP_KHZ, 144000);
247 clock_ll_set_source_divisor(PERIPH_ID_CSI, 0, src);
249 /* Unlock the CPU CoreSight interfaces */
251 writel(rst, CSITE_CPU_DBG0_LAR);
252 writel(rst, CSITE_CPU_DBG1_LAR);
256 void start_cpu(u32 reset_vector)
259 enable_cpu_power_rail();
261 /* Hold the CPUs in reset */
264 /* Disable the CPU clock */
267 /* Enable CoreSight */
268 clock_enable_coresight(1);
271 * Set the entry point for CPU execution from reset,
272 * if it's a non-zero value.
275 writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR);
277 /* Enable the CPU clock */
280 /* If the CPU doesn't already have power, power it up */
283 /* Take the CPU out of reset */
291 writel((HALT_COP_EVENT_JTAG | HALT_COP_EVENT_IRQ_1 \
292 | HALT_COP_EVENT_FIQ_1 | (FLOW_MODE_STOP<<29)),
293 FLOW_CTLR_HALT_COP_EVENTS);
297 void enable_scu(void)
299 struct scu_ctlr *scu = (struct scu_ctlr *)NV_PA_ARM_PERIPHBASE;
302 /* If SCU already setup/enabled, return */
303 if (readl(&scu->scu_ctrl) & SCU_CTRL_ENABLE)
306 /* Invalidate all ways for all processors */
307 writel(0xFFFF, &scu->scu_inv_all);
309 /* Enable SCU - bit 0 */
310 reg = readl(&scu->scu_ctrl);
311 reg |= SCU_CTRL_ENABLE;
312 writel(reg, &scu->scu_ctrl);
315 void init_pmc_scratch(void)
317 struct pmc_ctlr *const pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE;
320 /* SCRATCH0 is initialized by the boot ROM and shouldn't be cleared */
321 for (i = 0; i < 23; i++)
322 writel(0, &pmc->pmc_scratch1+i);
324 /* ODMDATA is for kernel use to determine RAM size, LP config, etc. */
325 writel(CONFIG_SYS_BOARD_ODMDATA, &pmc->pmc_scratch20);
327 #ifdef CONFIG_TEGRA2_LP0
328 /* save Sdram params to PMC 2, 4, and 24 for WB0 */
329 warmboot_save_sdram_params();
333 void tegra2_start(void)
335 struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
337 /* If we are the AVP, start up the first Cortex-A9 */
338 if (!ap20_cpu_is_cortexa9()) {
340 writel(0xC0, &pmt->pmt_cfg_ctl);
343 * If we are ARM7 - give it a different stack. We are about to
344 * start up the A9 which will want to use this one.
346 asm volatile("mov sp, %0\n"
347 : : "r"(AVP_EARLY_BOOT_STACK_LIMIT));
349 start_cpu((u32)_start);
354 /* Init PMC scratch memory */
359 /* enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg */
361 "mrc p15, 0, r0, c1, c0, 1\n"
362 "orr r0, r0, #0x41\n"
363 "mcr p15, 0, r0, c1, c0, 1\n");
365 /* FIXME: should have ap20's L2 disabled too? */