summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/ibm440gx_common.c
blob: a7dd55f1c63e126f604227f249aefe648039d2db (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/*
 * PPC440GX system library
 *
 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 * Copyright (c) 2003, 2004 Zultys Technologies
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <asm/ibm44x.h>
#include <asm/mmu.h>
#include <asm/processor.h>
#include <syslib/ibm440gx_common.h>

/*
 * Calculate 440GX clocks
 */
static inline u32 __fix_zero(u32 v, u32 def){
	return v ? v : def;
}

void __init ibm440gx_get_clocks(struct ibm44x_clocks* p, unsigned int sys_clk,
	unsigned int ser_clk)
{
	u32 pllc  = CPR_READ(DCRN_CPR_PLLC);
	u32 plld  = CPR_READ(DCRN_CPR_PLLD);
	u32 uart0 = SDR_READ(DCRN_SDR_UART0);
	u32 uart1 = SDR_READ(DCRN_SDR_UART1);
#ifdef CONFIG_440EP
	u32 uart2 = SDR_READ(DCRN_SDR_UART2);
	u32 uart3 = SDR_READ(DCRN_SDR_UART3);
#endif

	/* Dividers */
	u32 fbdv   = __fix_zero((plld >> 24) & 0x1f, 32);
	u32 fwdva  = __fix_zero((plld >> 16) & 0xf, 16);
	u32 fwdvb  = __fix_zero((plld >> 8) & 7, 8);
	u32 lfbdv  = __fix_zero(plld & 0x3f, 64);
	u32 pradv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMAD) >> 24) & 7, 8);
	u32 prbdv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMBD) >> 24) & 7, 8);
	u32 opbdv0 = __fix_zero((CPR_READ(DCRN_CPR_OPBD) >> 24) & 3, 4);
	u32 perdv0 = __fix_zero((CPR_READ(DCRN_CPR_PERD) >> 24) & 3, 4);

	/* Input clocks for primary dividers */
	u32 clk_a, clk_b;

	if (pllc & 0x40000000){
		u32 m;

		/* Feedback path */
		switch ((pllc >> 24) & 7){
		case 0:
			/* PLLOUTx */
			m = ((pllc & 0x20000000) ? fwdvb : fwdva) * lfbdv;
			break;
		case 1:
			/* CPU */
			m = fwdva * pradv0;
			break;
		case 5:
			/* PERClk */
			m = fwdvb * prbdv0 * opbdv0 * perdv0;
			break;
		default:
			printk(KERN_EMERG "invalid PLL feedback source\n");
			goto bypass;
		}
		m *= fbdv;
		p->vco = sys_clk * m;
		clk_a = p->vco / fwdva;
		clk_b = p->vco / fwdvb;
	}
	else {
bypass:
		/* Bypass system PLL */
		p->vco = 0;
		clk_a = clk_b = sys_clk;
	}

	p->cpu = clk_a / pradv0;
	p->plb = clk_b / prbdv0;
	p->opb = p->plb / opbdv0;
	p->ebc = p->opb / perdv0;

	/* UARTs clock */
	if (uart0 & 0x00800000)
		p->uart0 = ser_clk;
	else
		p->uart0 = p->plb / __fix_zero(uart0 & 0xff, 256);

	if (uart1 & 0x00800000)
		p->uart1 = ser_clk;
	else
		p->uart1 = p->plb / __fix_zero(uart1 & 0xff, 256);
#ifdef CONFIG_440EP
	if (uart2 & 0x00800000)
		p->uart2 = ser_clk;
	else
		p->uart2 = p->plb / __fix_zero(uart2 & 0xff, 256);

	if (uart3 & 0x00800000)
		p->uart3 = ser_clk;
	else
		p->uart3 = p->plb / __fix_zero(uart3 & 0xff, 256);
#endif
}

/* Issue L2C diagnostic command */
static inline u32 l2c_diag(u32 addr)
{
	mtdcr(DCRN_L2C0_ADDR, addr);
	mtdcr(DCRN_L2C0_CMD, L2C_CMD_DIAG);
	while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
	return mfdcr(DCRN_L2C0_DATA);
}

static irqreturn_t l2c_error_handler(int irq, void* dev, struct pt_regs* regs)
{
	u32 sr = mfdcr(DCRN_L2C0_SR);
	if (sr & L2C_SR_CPE){
		/* Read cache trapped address */
		u32 addr = l2c_diag(0x42000000);
		printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n", addr);
	}
	if (sr & L2C_SR_TPE){
		/* Read tag trapped address */
		u32 addr = l2c_diag(0x82000000) >> 16;
		printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n", addr);
	}

	/* Clear parity errors */
	if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
		mtdcr(DCRN_L2C0_ADDR, 0);
		mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
	} else
		printk(KERN_EMERG "L2C: LRU error\n");

	return IRQ_HANDLED;
}

/* Enable L2 cache */
void __init ibm440gx_l2c_enable(void){
	u32 r;
	unsigned long flags;

	/* Install error handler */
	if (request_irq(87, l2c_error_handler, SA_INTERRUPT, "L2C", 0) < 0){
		printk(KERN_ERR "Cannot install L2C error handler, cache is not enabled\n");
		return;
	}

	local_irq_save(flags);
	asm volatile ("sync" ::: "memory");

	/* Disable SRAM */
	mtdcr(DCRN_SRAM0_DPC,   mfdcr(DCRN_SRAM0_DPC)   & ~SRAM_DPC_ENABLE);
	mtdcr(DCRN_SRAM0_SB0CR, mfdcr(DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
	mtdcr(DCRN_SRAM0_SB1CR, mfdcr(DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
	mtdcr(DCRN_SRAM0_SB2CR, mfdcr(DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
	mtdcr(DCRN_SRAM0_SB3CR, mfdcr(DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);

	/* Enable L2_MODE without ICU/DCU */
	r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
	r |= L2C_CFG_L2M | L2C_CFG_SS_256;
	mtdcr(DCRN_L2C0_CFG, r);

	mtdcr(DCRN_L2C0_ADDR, 0);

	/* Hardware Clear Command */
	mtdcr(DCRN_L2C0_CMD, L2C_CMD_HCC);
	while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;

	/* Clear Cache Parity and Tag Errors */
	mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);

	/* Enable 64G snoop region starting at 0 */
	r = mfdcr(DCRN_L2C0_SNP0) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
	r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
	mtdcr(DCRN_L2C0_SNP0, r);

	r = mfdcr(DCRN_L2C0_SNP1) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
	r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
	mtdcr(DCRN_L2C0_SNP1, r);

	asm volatile ("sync" ::: "memory");

	/* Enable ICU/DCU ports */
	r = mfdcr(DCRN_L2C0_CFG);
	r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI
		| L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
	r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
		| L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
	mtdcr(DCRN_L2C0_CFG, r);

	asm volatile ("sync; isync" ::: "memory");
	local_irq_restore(flags);
}

/* Disable L2 cache */
void __init ibm440gx_l2c_disable(void){
	u32 r;
	unsigned long flags;

	local_irq_save(flags);
	asm volatile ("sync" ::: "memory");

	/* Disable L2C mode */
	r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_L2M | L2C_CFG_ICU | L2C_CFG_DCU);
	mtdcr(DCRN_L2C0_CFG, r);

	/* Enable SRAM */
	mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) | SRAM_DPC_ENABLE);
	mtdcr(DCRN_SRAM0_SB0CR,
	      SRAM_SBCR_BAS0 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
	mtdcr(DCRN_SRAM0_SB1CR,
	      SRAM_SBCR_BAS1 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
	mtdcr(DCRN_SRAM0_SB2CR,
	      SRAM_SBCR_BAS2 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
	mtdcr(DCRN_SRAM0_SB3CR,
	      SRAM_SBCR_BAS3 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);

	asm volatile ("sync; isync" ::: "memory");
	local_irq_restore(flags);
}

void __init ibm440gx_l2c_setup(struct ibm44x_clocks* p)
{
	/* Disable L2C on rev.A, rev.B and 800MHz version of rev.C,
	   enable it on all other revisions
	 */
	if (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. A") == 0 ||
			strcmp(cur_cpu_spec->cpu_name, "440GX Rev. B") == 0
			|| (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. C")
				== 0 && p->cpu > 667000000))
		ibm440gx_l2c_disable();
	else
		ibm440gx_l2c_enable();
}

int __init ibm440gx_get_eth_grp(void)
{
	return (SDR_READ(DCRN_SDR_PFC1) & DCRN_SDR_PFC1_EPS) >> DCRN_SDR_PFC1_EPS_SHIFT;
}

void __init ibm440gx_set_eth_grp(int group)
{
	SDR_WRITE(DCRN_SDR_PFC1, (SDR_READ(DCRN_SDR_PFC1) & ~DCRN_SDR_PFC1_EPS) | (group << DCRN_SDR_PFC1_EPS_SHIFT));
}

void __init ibm440gx_tah_enable(void)
{
	/* Enable TAH0 and TAH1 */
	SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
			~DCRN_SDR_MFR_TAH0);
	SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
			~DCRN_SDR_MFR_TAH1);
}

int ibm440gx_show_cpuinfo(struct seq_file *m){

	u32 l2c_cfg = mfdcr(DCRN_L2C0_CFG);
	const char* s;
	if (l2c_cfg & L2C_CFG_L2M){
	    switch (l2c_cfg & (L2C_CFG_ICU | L2C_CFG_DCU)){
		case L2C_CFG_ICU: s = "I-Cache only";    break;
		case L2C_CFG_DCU: s = "D-Cache only";    break;
		default:	  s = "I-Cache/D-Cache"; break;
	    }
	}
	else
	    s = "disabled";

	seq_printf(m, "L2-Cache\t: %s (0x%08x 0x%08x)\n", s,
	    l2c_cfg, mfdcr(DCRN_L2C0_SR));

	return 0;
}